add existing toolkit source

Wed, 09 Dec 2020 11:32:01 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Wed, 09 Dec 2020 11:32:01 +0100
changeset 0
804d8803eade
child 1
fcacc15a2ef2

add existing toolkit source

Makefile file | annotate | diff | comparison | revisions
application/Makefile file | annotate | diff | comparison | revisions
application/application.c file | annotate | diff | comparison | revisions
application/application.h file | annotate | diff | comparison | revisions
application/main.c file | annotate | diff | comparison | revisions
config.mk file | annotate | diff | comparison | revisions
configure file | annotate | diff | comparison | revisions
make/Makefile.mk file | annotate | diff | comparison | revisions
make/clang.mk file | annotate | diff | comparison | revisions
make/configure.vm file | annotate | diff | comparison | revisions
make/gcc.mk file | annotate | diff | comparison | revisions
make/mingw.mk file | annotate | diff | comparison | revisions
make/osx.mk file | annotate | diff | comparison | revisions
make/package_osx.sh file | annotate | diff | comparison | revisions
make/package_unix.sh file | annotate | diff | comparison | revisions
make/package_windows.sh file | annotate | diff | comparison | revisions
make/project.xml file | annotate | diff | comparison | revisions
make/suncc.mk file | annotate | diff | comparison | revisions
make/toolchain.sh file | annotate | diff | comparison | revisions
make/windows.mk file | annotate | diff | comparison | revisions
resource/.DS_Store file | annotate | diff | comparison | revisions
resource/locales/de_DE.properties file | annotate | diff | comparison | revisions
resource/locales/en_EN.properties file | annotate | diff | comparison | revisions
resource/template.app/Contents/Info.plist file | annotate | diff | comparison | revisions
resource/template.app/Contents/PkgInfo file | annotate | diff | comparison | revisions
resource/template.app/Contents/Resources/English.lproj/InfoPlist.strings file | annotate | diff | comparison | revisions
resource/template.app/Contents/Resources/English.lproj/MainMenu.nib file | annotate | diff | comparison | revisions
ucx/Makefile file | annotate | diff | comparison | revisions
ucx/README file | annotate | diff | comparison | revisions
ucx/allocator.c file | annotate | diff | comparison | revisions
ucx/array.c file | annotate | diff | comparison | revisions
ucx/avl.c file | annotate | diff | comparison | revisions
ucx/buffer.c file | annotate | diff | comparison | revisions
ucx/list.c file | annotate | diff | comparison | revisions
ucx/logging.c file | annotate | diff | comparison | revisions
ucx/map.c file | annotate | diff | comparison | revisions
ucx/mempool.c file | annotate | diff | comparison | revisions
ucx/properties.c file | annotate | diff | comparison | revisions
ucx/stack.c file | annotate | diff | comparison | revisions
ucx/string.c file | annotate | diff | comparison | revisions
ucx/test.c file | annotate | diff | comparison | revisions
ucx/ucx.c file | annotate | diff | comparison | revisions
ucx/ucx/allocator.h file | annotate | diff | comparison | revisions
ucx/ucx/array.h file | annotate | diff | comparison | revisions
ucx/ucx/avl.h file | annotate | diff | comparison | revisions
ucx/ucx/buffer.h file | annotate | diff | comparison | revisions
ucx/ucx/list.h file | annotate | diff | comparison | revisions
ucx/ucx/logging.h file | annotate | diff | comparison | revisions
ucx/ucx/map.h file | annotate | diff | comparison | revisions
ucx/ucx/mempool.h file | annotate | diff | comparison | revisions
ucx/ucx/properties.h file | annotate | diff | comparison | revisions
ucx/ucx/stack.h file | annotate | diff | comparison | revisions
ucx/ucx/string.h file | annotate | diff | comparison | revisions
ucx/ucx/test.h file | annotate | diff | comparison | revisions
ucx/ucx/ucx.h file | annotate | diff | comparison | revisions
ucx/ucx/utils.h file | annotate | diff | comparison | revisions
ucx/utils.c file | annotate | diff | comparison | revisions
ui/Makefile file | annotate | diff | comparison | revisions
ui/cocoa/Makefile file | annotate | diff | comparison | revisions
ui/cocoa/container.h file | annotate | diff | comparison | revisions
ui/cocoa/container.m file | annotate | diff | comparison | revisions
ui/cocoa/graphics.h file | annotate | diff | comparison | revisions
ui/cocoa/graphics.m file | annotate | diff | comparison | revisions
ui/cocoa/menu.h file | annotate | diff | comparison | revisions
ui/cocoa/menu.m file | annotate | diff | comparison | revisions
ui/cocoa/objs.mk file | annotate | diff | comparison | revisions
ui/cocoa/resource.h file | annotate | diff | comparison | revisions
ui/cocoa/resource.m file | annotate | diff | comparison | revisions
ui/cocoa/stock.h file | annotate | diff | comparison | revisions
ui/cocoa/stock.m file | annotate | diff | comparison | revisions
ui/cocoa/text.h file | annotate | diff | comparison | revisions
ui/cocoa/text.m file | annotate | diff | comparison | revisions
ui/cocoa/toolbar.h file | annotate | diff | comparison | revisions
ui/cocoa/toolbar.m file | annotate | diff | comparison | revisions
ui/cocoa/toolkit.h file | annotate | diff | comparison | revisions
ui/cocoa/toolkit.m file | annotate | diff | comparison | revisions
ui/cocoa/tree.h file | annotate | diff | comparison | revisions
ui/cocoa/tree.m file | annotate | diff | comparison | revisions
ui/cocoa/window.h file | annotate | diff | comparison | revisions
ui/cocoa/window.m file | annotate | diff | comparison | revisions
ui/common/context.c file | annotate | diff | comparison | revisions
ui/common/context.h file | annotate | diff | comparison | revisions
ui/common/document.c file | annotate | diff | comparison | revisions
ui/common/document.h file | annotate | diff | comparison | revisions
ui/common/object.c file | annotate | diff | comparison | revisions
ui/common/object.h file | annotate | diff | comparison | revisions
ui/common/objs.mk file | annotate | diff | comparison | revisions
ui/common/properties.c file | annotate | diff | comparison | revisions
ui/common/properties.h file | annotate | diff | comparison | revisions
ui/common/types.c file | annotate | diff | comparison | revisions
ui/common/types.h file | annotate | diff | comparison | revisions
ui/gtk/Makefile file | annotate | diff | comparison | revisions
ui/gtk/button.c file | annotate | diff | comparison | revisions
ui/gtk/button.h file | annotate | diff | comparison | revisions
ui/gtk/container.c file | annotate | diff | comparison | revisions
ui/gtk/container.h file | annotate | diff | comparison | revisions
ui/gtk/display.c file | annotate | diff | comparison | revisions
ui/gtk/display.h file | annotate | diff | comparison | revisions
ui/gtk/dnd.c file | annotate | diff | comparison | revisions
ui/gtk/dnd.h file | annotate | diff | comparison | revisions
ui/gtk/draw_cairo.c file | annotate | diff | comparison | revisions
ui/gtk/draw_cairo.h file | annotate | diff | comparison | revisions
ui/gtk/draw_gdk.c file | annotate | diff | comparison | revisions
ui/gtk/draw_gdk.h file | annotate | diff | comparison | revisions
ui/gtk/entry.c file | annotate | diff | comparison | revisions
ui/gtk/entry.h file | annotate | diff | comparison | revisions
ui/gtk/graphics.c file | annotate | diff | comparison | revisions
ui/gtk/graphics.h file | annotate | diff | comparison | revisions
ui/gtk/image.c file | annotate | diff | comparison | revisions
ui/gtk/image.h file | annotate | diff | comparison | revisions
ui/gtk/menu.c file | annotate | diff | comparison | revisions
ui/gtk/menu.h file | annotate | diff | comparison | revisions
ui/gtk/model.c file | annotate | diff | comparison | revisions
ui/gtk/model.h file | annotate | diff | comparison | revisions
ui/gtk/objs.mk file | annotate | diff | comparison | revisions
ui/gtk/range.c file | annotate | diff | comparison | revisions
ui/gtk/range.h file | annotate | diff | comparison | revisions
ui/gtk/text.c file | annotate | diff | comparison | revisions
ui/gtk/text.h file | annotate | diff | comparison | revisions
ui/gtk/toolbar.c file | annotate | diff | comparison | revisions
ui/gtk/toolbar.h file | annotate | diff | comparison | revisions
ui/gtk/toolkit.c file | annotate | diff | comparison | revisions
ui/gtk/toolkit.h file | annotate | diff | comparison | revisions
ui/gtk/tree.c file | annotate | diff | comparison | revisions
ui/gtk/tree.h file | annotate | diff | comparison | revisions
ui/gtk/window.c file | annotate | diff | comparison | revisions
ui/motif/Makefile file | annotate | diff | comparison | revisions
ui/motif/button.c file | annotate | diff | comparison | revisions
ui/motif/button.h file | annotate | diff | comparison | revisions
ui/motif/container.c file | annotate | diff | comparison | revisions
ui/motif/container.h file | annotate | diff | comparison | revisions
ui/motif/dnd.c file | annotate | diff | comparison | revisions
ui/motif/dnd.h file | annotate | diff | comparison | revisions
ui/motif/graphics.c file | annotate | diff | comparison | revisions
ui/motif/graphics.h file | annotate | diff | comparison | revisions
ui/motif/image.c file | annotate | diff | comparison | revisions
ui/motif/image.h file | annotate | diff | comparison | revisions
ui/motif/label.c file | annotate | diff | comparison | revisions
ui/motif/label.h file | annotate | diff | comparison | revisions
ui/motif/list.c file | annotate | diff | comparison | revisions
ui/motif/list.h file | annotate | diff | comparison | revisions
ui/motif/menu.c file | annotate | diff | comparison | revisions
ui/motif/menu.h file | annotate | diff | comparison | revisions
ui/motif/objs.mk file | annotate | diff | comparison | revisions
ui/motif/range.c file | annotate | diff | comparison | revisions
ui/motif/range.h file | annotate | diff | comparison | revisions
ui/motif/stock.c file | annotate | diff | comparison | revisions
ui/motif/stock.h file | annotate | diff | comparison | revisions
ui/motif/text.c file | annotate | diff | comparison | revisions
ui/motif/text.h file | annotate | diff | comparison | revisions
ui/motif/toolbar.c file | annotate | diff | comparison | revisions
ui/motif/toolbar.h file | annotate | diff | comparison | revisions
ui/motif/toolkit.c file | annotate | diff | comparison | revisions
ui/motif/toolkit.h file | annotate | diff | comparison | revisions
ui/motif/tree.c file | annotate | diff | comparison | revisions
ui/motif/tree.h file | annotate | diff | comparison | revisions
ui/motif/window.c file | annotate | diff | comparison | revisions
ui/qt/Makefile file | annotate | diff | comparison | revisions
ui/qt/button.cpp file | annotate | diff | comparison | revisions
ui/qt/button.h file | annotate | diff | comparison | revisions
ui/qt/container.cpp file | annotate | diff | comparison | revisions
ui/qt/container.h file | annotate | diff | comparison | revisions
ui/qt/graphics.cpp file | annotate | diff | comparison | revisions
ui/qt/graphics.h file | annotate | diff | comparison | revisions
ui/qt/label.cpp file | annotate | diff | comparison | revisions
ui/qt/label.h file | annotate | diff | comparison | revisions
ui/qt/menu.cpp file | annotate | diff | comparison | revisions
ui/qt/menu.h file | annotate | diff | comparison | revisions
ui/qt/model.cpp file | annotate | diff | comparison | revisions
ui/qt/model.h file | annotate | diff | comparison | revisions
ui/qt/objs.mk file | annotate | diff | comparison | revisions
ui/qt/qt4.pro file | annotate | diff | comparison | revisions
ui/qt/stock.cpp file | annotate | diff | comparison | revisions
ui/qt/stock.h file | annotate | diff | comparison | revisions
ui/qt/text.cpp file | annotate | diff | comparison | revisions
ui/qt/text.h file | annotate | diff | comparison | revisions
ui/qt/toolbar.cpp file | annotate | diff | comparison | revisions
ui/qt/toolbar.h file | annotate | diff | comparison | revisions
ui/qt/toolkit.cpp file | annotate | diff | comparison | revisions
ui/qt/toolkit.h file | annotate | diff | comparison | revisions
ui/qt/tree.cpp file | annotate | diff | comparison | revisions
ui/qt/tree.h file | annotate | diff | comparison | revisions
ui/qt/window.cpp file | annotate | diff | comparison | revisions
ui/qt/window.h file | annotate | diff | comparison | revisions
ui/ui/button.h file | annotate | diff | comparison | revisions
ui/ui/container.h file | annotate | diff | comparison | revisions
ui/ui/display.h file | annotate | diff | comparison | revisions
ui/ui/dnd.h file | annotate | diff | comparison | revisions
ui/ui/entry.h file | annotate | diff | comparison | revisions
ui/ui/graphics.h file | annotate | diff | comparison | revisions
ui/ui/image.h file | annotate | diff | comparison | revisions
ui/ui/menu.h file | annotate | diff | comparison | revisions
ui/ui/properties.h file | annotate | diff | comparison | revisions
ui/ui/range.h file | annotate | diff | comparison | revisions
ui/ui/stock.h file | annotate | diff | comparison | revisions
ui/ui/text.h file | annotate | diff | comparison | revisions
ui/ui/toolbar.h file | annotate | diff | comparison | revisions
ui/ui/toolkit.h file | annotate | diff | comparison | revisions
ui/ui/tree.h file | annotate | diff | comparison | revisions
ui/ui/ui.h file | annotate | diff | comparison | revisions
ui/ui/window.h file | annotate | diff | comparison | revisions
ui/wpf/Makefile file | annotate | diff | comparison | revisions
ui/wpf/UIcore/Application.cs file | annotate | diff | comparison | revisions
ui/wpf/UIcore/Container.cs file | annotate | diff | comparison | revisions
ui/wpf/UIcore/Controls.cs file | annotate | diff | comparison | revisions
ui/wpf/UIcore/DrawingArea.cs file | annotate | diff | comparison | revisions
ui/wpf/UIcore/MainToolBar.cs file | annotate | diff | comparison | revisions
ui/wpf/UIcore/Menu.cs file | annotate | diff | comparison | revisions
ui/wpf/UIcore/Properties/AssemblyInfo.cs file | annotate | diff | comparison | revisions
ui/wpf/UIcore/TextArea.cs file | annotate | diff | comparison | revisions
ui/wpf/UIcore/Toolkit.cs file | annotate | diff | comparison | revisions
ui/wpf/UIcore/UIcore.csproj file | annotate | diff | comparison | revisions
ui/wpf/UIcore/Window.cs file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper.sln file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper.v12.suo file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/AssemblyInfo.cpp file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/ReadMe.txt file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/Stdafx.cpp file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/Stdafx.h file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/UIwrapper.vcxproj file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/UIwrapper.vcxproj.filters file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/UIwrapper.vcxproj.user file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/app.ico file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/app.rc file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/container.cpp file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/container.h file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/controls.cpp file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/controls.h file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/graphics.cpp file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/graphics.h file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/menu.cpp file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/menu.h file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/resource.h file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/toolbar.cpp file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/toolbar.h file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/toolkit.cpp file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/toolkit.h file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/window.cpp file | annotate | diff | comparison | revisions
ui/wpf/UIwrapper/UIwrapper/window.h file | annotate | diff | comparison | revisions
ui/wpf/button.c file | annotate | diff | comparison | revisions
ui/wpf/button.h file | annotate | diff | comparison | revisions
ui/wpf/container.c file | annotate | diff | comparison | revisions
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ui/wpf/graphics.c file | annotate | diff | comparison | revisions
ui/wpf/graphics.h file | annotate | diff | comparison | revisions
ui/wpf/label.c file | annotate | diff | comparison | revisions
ui/wpf/label.h file | annotate | diff | comparison | revisions
ui/wpf/menu.c file | annotate | diff | comparison | revisions
ui/wpf/menu.h file | annotate | diff | comparison | revisions
ui/wpf/objs.mk file | annotate | diff | comparison | revisions
ui/wpf/text.c file | annotate | diff | comparison | revisions
ui/wpf/text.h file | annotate | diff | comparison | revisions
ui/wpf/toolbar.c file | annotate | diff | comparison | revisions
ui/wpf/toolbar.h file | annotate | diff | comparison | revisions
ui/wpf/toolkit.c file | annotate | diff | comparison | revisions
ui/wpf/toolkit.h file | annotate | diff | comparison | revisions
ui/wpf/window.c file | annotate | diff | comparison | revisions
ui/wpf/window.h file | annotate | diff | comparison | revisions
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Makefile	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,38 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2011 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+all: config.mk
+	$(MAKE) -f make/Makefile.mk
+
+config.mk:
+	./configure
+
+clean: FORCE
+	rm -fR build/*
+
+FORCE:
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/application/Makefile	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,46 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2011 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+BUILD_ROOT = ../
+include ../config.mk
+
+CFLAGS += -I../ui/ -I../ucx
+
+SRC = main.c
+SRC += application.c
+
+OBJ = $(SRC:%.c=../build/application/%.$(OBJ_EXT))
+
+all: ../build/bin/mk12
+
+../build/bin/mk12: $(OBJ) $(BUILD_ROOT)/build/lib/libuitk.a
+	$(LD) -o ../build/bin/mk12$(APP_EXT) $(OBJ) -L$(BUILD_ROOT)/build/lib -luitk -lucx $(LDFLAGS) $(TK_LDFLAGS)
+
+../build/application/%.$(OBJ_EXT): %.c
+	$(CC) $(CFLAGS) $(TK_CFLAGS) -o $@ -c $<
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/application/application.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,30 @@
+
+
+#include "application.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void application_startup(UiEvent *event, void *data) {
+    UiObject *win = ui_window("Note", NULL);
+    
+    UI_VBOX(win) {
+        ui_button(win, "Line1", NULL, NULL);
+        ui_button(win, "Line2", NULL, NULL);
+        UI_HBOX(win) {
+            ui_button(win, "Line3_1", NULL, NULL);
+            ui_button(win, "Line3_2", NULL, NULL);
+            ui_button(win, "Line3_3", NULL, NULL);
+        }
+        UI_CTN(win, ui_hbox_sp(win, 10, 10)) {
+            ui_label(win, "1");
+            ui_label(win, "2");
+            ui_layout_fill(win, TRUE);
+            ui_textfield(win, NULL);
+        }
+        ui_button(win, "Line4", NULL, NULL);
+    }
+    
+    ui_show(win);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/application/application.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,31 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/* 
+ * File:   application.h
+ * Author: olaf
+ *
+ * Created on 8. Dezember 2020, 10:40
+ */
+
+#ifndef APPLICATION_H
+#define APPLICATION_H
+
+#include <ui/ui.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void application_startup(UiEvent *event, void *data);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* APPLICATION_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/application/main.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,47 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <ui/ui.h>
+#include <ucx/buffer.h>
+#include <ucx/utils.h>
+
+#include "application.h"
+
+
+
+int main(int argc, char** argv) { 
+    ui_init("uwnote", argc, argv);
+    ui_onstartup(application_startup, NULL);
+    
+    ui_main();
+    
+    return (EXIT_SUCCESS);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/config.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,41 @@
+#
+# config.mk generated by configure
+#
+
+# general vars
+
+PREFIX=/usr
+EPREFIX=/usr
+
+BINDIR=/usr/bin
+SBINDIR=/usr/sbin
+LIBDIR=/usr/lib
+LIBEXECDIR=/usr/libexec
+DATADIR=/usr/share
+SYSCONFDIR=/usr/etc
+SHAREDSTATEDIR=/usr/com
+LOCALSTATEDIR=/usr/var
+INCLUDEDIR=/usr/include
+INFODIR=/usr/info
+MANDIR=/usr/man
+
+# toolchain
+CC = clang
+CXX = clang++
+LD = clang
+
+include $(BUILD_ROOT)/make/clang.mk
+
+
+
+TK_CFLAGS  += -g -I/usr/local/include/gtk-3.0 -I/usr/local/include/pango-1.0 -I/usr/local/include/glib-2.0 -I/usr/local/lib/glib-2.0/include -I/usr/local/include -I/usr/local/include/fribidi -I/usr/local/include/cairo -I/usr/local/include/pixman-1 -I/usr/local/include/freetype2 -I/usr/local/include/libdrm -I/usr/local/include/libpng16 -I/usr/local/include/harfbuzz -I/usr/local/include/gdk-pixbuf-2.0 -I/usr/local/include/gio-unix-2.0 -I/usr/local/include/libepoll-shim -I/usr/local/include/atk-1.0 -I/usr/local/include/at-spi2-atk/2.0 -I/usr/local/include/dbus-1.0 -I/usr/local/lib/dbus-1.0/include -I/usr/local/include/at-spi-2.0 -D_THREAD_SAFE -pthread  -DUI_GTK3
+TK_LDFLAGS +=  -L/usr/local/lib -lgtk-3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0 -latk-1.0 -lcairo-gobject -lcairo -lpthread -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0 -lintl  -lpthread
+
+OBJ_EXT = o
+LIB_EXT = a
+PACKAGE_SCRIPT = package_unix.sh
+
+TOOLKIT = gtk
+GTKOBJ = draw_cairo.o
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/configure	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,743 @@
+#!/bin/sh
+
+
+PREFIX=/usr
+EPREFIX=$PREFIX
+
+BINDIR=
+SBINDIR=
+LIBDIR=
+LIBEXECDIR=
+DATADIR=
+SYSCONFDIR=
+SHAREDSTATEDIR=
+LOCALSTATEDIR=
+INCLUDEDIR=
+INFODIR=
+MANDIR=
+
+OS=`uname -s`
+OS_VERSION=`uname -r`
+
+TEMP_DIR=".tmp-`uname -n`"
+mkdir -p $TEMP_DIR
+if [ $? -ne 0 ]; then
+	echo "Cannot create tmp dir"
+	echo "Abort"
+fi
+touch $TEMP_DIR/options
+touch $TEMP_DIR/features
+
+# features
+
+# help text
+printhelp()
+{
+	echo "Usage: $0 [OPTIONS]..."
+	cat << __EOF__
+Installation directories:
+  --prefix=PREFIX         path prefix for architecture-independent files
+                          [/usr]
+  --exec-prefix=EPREFIX   path prefix for architecture-dependent files
+                          [PREFIX]
+
+  --bindir=DIR            user executables [EPREFIX/bin]
+  --sbindir=DIR           system admin executables [EPREFIX/sbin]
+  --libexecdir=DIR        program executables [EPREFIX/libexec]
+  --sysconfdir=DIR        system configuration files [PREFIX/etc]
+  --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
+  --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --libdir=DIR            object code libraries [EPREFIX/lib]
+  --includedir=DIR        C header files [PREFIX/include]
+  --datarootdir=DIR       read-only arch.-independent data root [PREFIX/share]
+  --datadir=DIR           read-only architecture-independent data [DATAROOTDIR]
+  --infodir=DIR           info documentation [DATAROOTDIR/info]
+  --mandir=DIR            man documentation [DATAROOTDIR/man]
+
+Options:
+  --toolkit=(gtk3|gtk2|gtk2legacy|qt5|qt4|motif)
+
+__EOF__
+}
+
+#
+# parse arguments 
+#
+for ARG in $@
+do
+    case "$ARG" in
+		"--prefix="*)         PREFIX=${ARG#--prefix=} ;;
+		"--exec-prefix="*)    EPREFIX=${ARG#--exec-prefix=} ;;
+		"--bindir="*)         BINDIR=${ARG#----bindir=} ;;
+		"--sbindir="*)        SBINDIR=${ARG#--sbindir=} ;;
+		"--libdir="*)         LIBDIR=${ARG#--libdir=} ;;
+		"--libexecdir="*)     LIBEXECDIR=${ARG#--libexecdir=} ;;
+		"--datadir="*)        DATADIR=${ARG#--datadir=} ;;
+		"--sysconfdir="*)     SYSCONFDIR=${ARG#--sysconfdir=} ;;
+		"--sharedstatedir="*) SHAREDSTATEDIR=${ARG#--sharedstatedir=} ;;
+		"--localstatedir="*)  LOCALSTATEDIR=${ARG#--localstatedir=} ;;
+		"--includedir="*)     INCLUDEDIR=${ARG#--includedir=} ;;
+		"--infodir="*)        INFODIR=${ARG#--infodir=} ;;
+		"--mandir"*)          MANDIR=${ARG#--mandir} ;;
+		"--help"*) printhelp; exit 1 ;;
+    	"--toolkit="*) OPT_TOOLKIT=${ARG#--toolkit=} ;;
+		"-"*) echo "unknown option: $ARG"; exit 1 ;;
+	esac
+done
+
+# set dir variables
+if [ -z "$BINDIR" ]; then
+	BINDIR=$EPREFIX/bin
+fi
+if [ -z "$SBINDIR" ]; then
+	SBINDIR=$EPREFIX/sbin
+fi
+if [ -z "$LIBDIR" ]; then
+	LIBDIR=$EPREFIX/lib
+fi
+if [ -z "$LIBEXEC" ]; then
+	LIBEXECDIR=$EPREFIX/libexec
+fi
+if [ -z "$DATADIR" ]; then
+	DATADIR=$PREFIX/share
+fi
+if [ -z "$SYSCONFDIR" ]; then
+	SYSCONFDIR=$PREFIX/etc
+fi
+if [ -z "$SHAREDSTATEDIR" ]; then
+	SHAREDSTATEDIR=$PREFIX/com
+fi
+if [ -z "$LOCALSTATEDIR" ]; then
+	LOCALSTATEDIR=$PREFIX/var
+fi
+if [ -z "$INCLUDEDIR" ]; then
+	INCLUDEDIR=$PREFIX/include
+fi
+if [ -z "$INFODIR" ]; then
+	INFODIR=$PREFIX/info
+fi
+if [ -z "$MANDIR" ]; then
+	MANDIR=$PREFIX/man
+fi
+
+which pkg-config > /dev/null
+if [ $? -eq 0 ]; then
+    PKG_CONFIG=pkg-config
+else
+    PKG_CONFIG=false
+fi
+
+# Simple uname based platform detection
+# $PLATFORM is used for platform dependent dependency selection
+printf "detect platform... "
+if [ $OS = SunOS ]; then
+    PLATFORM="solaris sunos unix svr4"
+fi
+if [ $OS = Linux ]; then
+    PLATFORM="linux unix"
+fi
+if [ $OS = FreeBSD ]; then
+    PLATFORM="freebsd bsd unix"
+fi
+if [ $OS = Darwin ]; then
+    PLATFORM="macos osx bsd unix"
+fi
+echo $OS | grep "MINGW" > /dev/null
+if [ $? -eq 0 ]; then
+    PLATFORM="windows mingw"
+fi
+
+if [ -z "$PLATFORM" ]; then
+    PLATFORM="unix"
+fi
+
+for p in $PLATFORM
+do
+	PLATFORM_NAME=$p
+	break
+done
+echo $PLATFORM_NAME
+
+isplatform()
+{
+    for p in $PLATFORM
+    do
+        if [ $p = $1 ]; then
+            return 0
+        fi
+    done
+    return 1
+}
+isnotplatform()
+{
+    for p in $PLATFORM
+    do
+        if [ $p = $1 ]; then
+            return 1
+        fi
+    done
+    return 0
+}
+
+# generate config.mk and config.h
+cat > $TEMP_DIR/config.mk << __EOF__
+#
+# config.mk generated by configure
+#
+
+# general vars
+
+PREFIX=$PREFIX
+EPREFIX=$EPREFIX
+
+BINDIR=$BINDIR
+SBINDIR=$SBINDIR
+LIBDIR=$LIBDIR
+LIBEXECDIR=$LIBEXECDIR
+DATADIR=$DATADIR
+SYSCONFDIR=$SYSCONFDIR
+SHAREDSTATEDIR=$SHAREDSTATEDIR
+LOCALSTATEDIR=$LOCALSTATEDIR
+INCLUDEDIR=$INCLUDEDIR
+INFODIR=$INFODIR
+MANDIR=$MANDIR
+
+__EOF__
+
+echo > $TEMP_DIR/make.mk
+
+ENV_CFLAGS=$CFLAGS
+ENV_LDFLAGS=$LDFLAGS
+ENV_CXXFLAGS=$CXXFLAGS
+
+# Toolchain detection
+# this will insert make vars to config.mk
+. make/toolchain.sh
+
+# add user specified flags to config.mk
+echo >> $TEMP_DIR/config.mk
+if [ ! -z "${ENV_CFLAGS}" ]; then
+    echo "CFLAGS += $ENV_CFLAGS" >> $TEMP_DIR/config.mk
+fi
+if [ ! -z "${ENV_CXXFLAGS}" ]; then
+    echo "CXXFLAGS += $ENV_CXXFLAGS" >> $TEMP_DIR/config.mk
+fi
+if [ ! -z "${ENV_LDFLAGS}" ]; then
+    echo "LDFLAGS += $ENV_LDFLAGS" >> $TEMP_DIR/config.mk
+fi
+
+#
+# DEPENDENCIES
+#
+
+dependency_qt4()
+{
+    printf "checking for qt4... "
+    # dependency qt4 
+    while true
+    do
+        qmake-qt4 -o - /dev/null | grep DEFINES\  > /dev/null
+        if [ $? -eq 0 ]; then
+            CFLAGS="$CFLAGS `qmake-qt4 -o - /dev/null | grep DEFINES\ `"
+        else
+            break
+        fi
+        qmake-qt4 -o - /dev/null | grep INCPATH\  > /dev/null
+        if [ $? -eq 0 ]; then
+            CFLAGS="$CFLAGS `qmake-qt4 -o - /dev/null | grep INCPATH\ `"
+        else
+            break
+        fi
+         > /dev/null
+        if [ $? -eq 0 ]; then
+            LDFLAGS="$LDFLAGS ``"
+        else
+            break
+        fi
+        which qmake-qt4 > /dev/null
+        if [ $? -ne 0 ]; then
+        	break
+        fi
+		echo yes
+        return 0
+    done
+	
+	echo no
+	return 1
+}
+dependency_gtk2legacy()
+{
+    printf "checking for gtk2legacy... "
+    # dependency gtk2legacy 
+    while true
+    do
+        if [ -z "$PKG_CONFIG" ]; then
+        	break
+        fi
+		$PKG_CONFIG gtk+-2.0
+        if [ $? -ne 0 ] ; then
+            break
+        fi
+        CFLAGS="$CFLAGS `$PKG_CONFIG --cflags gtk+-2.0`"
+        LDFLAGS="$LDFLAGS `$PKG_CONFIG --libs gtk+-2.0`"
+        CFLAGS="$CFLAGS -DUI_GTK2 -DUI_GTK2LEGACY"    
+        LDFLAGS="$LDFLAGS -lpthread"    
+		echo yes
+        return 0
+    done
+	
+	echo no
+	return 1
+}
+dependency_qt5()
+{
+    printf "checking for qt5... "
+    # dependency qt5 
+    while true
+    do
+        qmake-qt5 -o - /dev/null | grep DEFINES\  > /dev/null
+        if [ $? -eq 0 ]; then
+            CFLAGS="$CFLAGS `qmake-qt5 -o - /dev/null | grep DEFINES\ `"
+        else
+            break
+        fi
+        qmake-qt5 -o - /dev/null | grep INCPATH\  > /dev/null
+        if [ $? -eq 0 ]; then
+            CFLAGS="$CFLAGS `qmake-qt5 -o - /dev/null | grep INCPATH\ `"
+        else
+            break
+        fi
+         > /dev/null
+        if [ $? -eq 0 ]; then
+            LDFLAGS="$LDFLAGS ``"
+        else
+            break
+        fi
+        which qmake-qt5 > /dev/null
+        if [ $? -ne 0 ]; then
+        	break
+        fi
+		echo yes
+        return 0
+    done
+	
+	echo no
+	return 1
+}
+dependency_gtk2()
+{
+    printf "checking for gtk2... "
+    # dependency gtk2 
+    while true
+    do
+        if [ -z "$PKG_CONFIG" ]; then
+        	break
+        fi
+		$PKG_CONFIG gtk+-2.0
+        if [ $? -ne 0 ] ; then
+            break
+        fi
+        CFLAGS="$CFLAGS `$PKG_CONFIG --cflags gtk+-2.0`"
+        LDFLAGS="$LDFLAGS `$PKG_CONFIG --libs gtk+-2.0`"
+        CFLAGS="$CFLAGS -DUI_GTK2"    
+        LDFLAGS="$LDFLAGS -lpthread"    
+        pkg-config --atleast-version=2.20 gtk+-2.0 > /dev/null
+        if [ $? -ne 0 ]; then
+        	break
+        fi
+		echo yes
+        return 0
+    done
+	
+	echo no
+	return 1
+}
+dependency_gtk3()
+{
+    printf "checking for gtk3... "
+    # dependency gtk3 
+    while true
+    do
+        if [ -z "$PKG_CONFIG" ]; then
+        	break
+        fi
+		$PKG_CONFIG gtk+-3.0
+        if [ $? -ne 0 ] ; then
+            break
+        fi
+        CFLAGS="$CFLAGS `$PKG_CONFIG --cflags gtk+-3.0`"
+        LDFLAGS="$LDFLAGS `$PKG_CONFIG --libs gtk+-3.0`"
+        CFLAGS="$CFLAGS -DUI_GTK3"    
+        LDFLAGS="$LDFLAGS -lpthread"    
+		echo yes
+        return 0
+    done
+	
+	echo no
+	return 1
+}
+dependency_motif()
+{
+    printf "checking for motif... "
+    # dependency motif 
+    while true
+    do
+        CFLAGS="$CFLAGS -DUI_MOTIF"    
+        LDFLAGS="$LDFLAGS -lXm -lXt -lX11 -lpthread"    
+		echo yes
+        return 0
+    done
+	
+	echo no
+	return 1
+}
+dependency_wpf()
+{
+    printf "checking for wpf... "
+    # dependency wpf platform="windows"
+    while true
+    do
+    	if isnotplatform "windows"; then
+            break
+        fi
+        CFLAGS="$CFLAGS -DUI_WPF"    
+		echo yes
+        return 0
+    done
+	
+	echo no
+	return 1
+}
+dependency_cocoa()
+{
+    printf "checking for cocoa... "
+    # dependency cocoa platform="macos"
+    while true
+    do
+    	if isnotplatform "macos"; then
+            break
+        fi
+        CFLAGS="$CFLAGS -DUI_COCOA"    
+        LDFLAGS="$LDFLAGS -lobjc -framework Cocoa"    
+		echo yes
+        return 0
+    done
+	
+	echo no
+	return 1
+}
+
+DEPENDENCIES_FAILED=
+ERROR=0
+# general dependencies
+CFLAGS=
+LDFLAGS=
+while true
+do
+    if isnotplatform "macos"; then
+        break
+    fi
+    while true
+    do
+        
+		cat >> $TEMP_DIR/make.mk << __EOF__
+OBJ_EXT = o
+LIB_EXT = a
+PACKAGE_SCRIPT = package_osx.sh
+
+__EOF__
+        
+        break
+    done
+    
+    break
+done
+while true
+do
+    if isnotplatform "unix"; then
+        break
+    fi
+    if isplatform "macos"; then
+        break
+    fi
+    while true
+    do
+        
+		cat >> $TEMP_DIR/make.mk << __EOF__
+OBJ_EXT = o
+LIB_EXT = a
+PACKAGE_SCRIPT = package_unix.sh
+
+__EOF__
+        
+        break
+    done
+    
+    break
+done
+
+# add general dependency flags to config.mk
+echo >> $TEMP_DIR/config.mk
+if [ ! -z "${CFLAGS}" ]; then
+    echo "CFLAGS += $CFLAGS" >> $TEMP_DIR/config.mk
+fi
+if [ ! -z "${CXXFLAGS}" ]; then
+    echo "CXXFLAGS += $CXXFLAGS" >> $TEMP_DIR/config.mk
+fi
+if [ ! -z "${LDFLAGS}" ]; then
+    echo "LDFLAGS += $LDFLAGS" >> $TEMP_DIR/config.mk
+fi
+
+#
+# OPTION VALUES
+#
+checkopt_toolkit_gtk3()
+{
+	VERR=0
+	dependency_gtk3
+	if [ $? -ne 0 ]; then
+		VERR=1
+	fi
+	if [ $VERR -ne 0 ]; then
+		return 1
+	fi
+	cat >> $TEMP_DIR/make.mk << __EOF__
+TOOLKIT = gtk
+GTKOBJ = draw_cairo.o
+
+__EOF__
+	return 0
+}
+checkopt_toolkit_gtk2()
+{
+	VERR=0
+	dependency_gtk2
+	if [ $? -ne 0 ]; then
+		VERR=1
+	fi
+	if [ $VERR -ne 0 ]; then
+		return 1
+	fi
+	cat >> $TEMP_DIR/make.mk << __EOF__
+TOOLKIT = gtk
+GTKOBJ = draw_cairo.o
+
+__EOF__
+	return 0
+}
+checkopt_toolkit_gtk2legacy()
+{
+	VERR=0
+	dependency_gtk2legacy
+	if [ $? -ne 0 ]; then
+		VERR=1
+	fi
+	if [ $VERR -ne 0 ]; then
+		return 1
+	fi
+	cat >> $TEMP_DIR/make.mk << __EOF__
+TOOLKIT = gtk
+GTKOBJ = draw_gdk.o
+
+__EOF__
+	return 0
+}
+checkopt_toolkit_qt5()
+{
+	VERR=0
+	dependency_qt5
+	if [ $? -ne 0 ]; then
+		VERR=1
+	fi
+	if [ $VERR -ne 0 ]; then
+		return 1
+	fi
+	cat >> $TEMP_DIR/make.mk << __EOF__
+TOOLKIT = qt
+LD = $(CXX)
+
+__EOF__
+	return 0
+}
+checkopt_toolkit_qt4()
+{
+	VERR=0
+	dependency_qt4
+	if [ $? -ne 0 ]; then
+		VERR=1
+	fi
+	if [ $VERR -ne 0 ]; then
+		return 1
+	fi
+	cat >> $TEMP_DIR/make.mk << __EOF__
+TOOLKIT = qt
+LD = $(CXX)
+
+__EOF__
+	return 0
+}
+checkopt_toolkit_motif()
+{
+	VERR=0
+	dependency_motif
+	if [ $? -ne 0 ]; then
+		VERR=1
+	fi
+	if [ $VERR -ne 0 ]; then
+		return 1
+	fi
+	cat >> $TEMP_DIR/make.mk << __EOF__
+TOOLKIT = motif
+
+__EOF__
+	return 0
+}
+
+#
+# TARGETS
+#
+CFLAGS=
+CXXFLAGS=
+LDFLAGS=
+
+# Target: tk
+CFLAGS=
+LDFLAGS=
+CXXFLAGS=
+
+
+# Features
+
+# Option: --toolkit
+if [ -z $OPT_TOOLKIT ]; then
+	SAVED_ERROR=$ERROR
+	SAVED_DEPENDENCIES_FAILED=$DEPENDENCIES_FAILED
+	ERROR=0
+	while true
+	do
+		if isplatform "windows"; then
+		checkopt_toolkit_wpf
+		if [ $? -eq 0 ]; then
+			echo "  toolkit: wpf" >> $TEMP_DIR/options
+			ERROR=0
+			break
+		fi
+		fi
+		if isplatform "macos"; then
+		checkopt_toolkit_cocoa
+		if [ $? -eq 0 ]; then
+			echo "  toolkit: cocoa" >> $TEMP_DIR/options
+			ERROR=0
+			break
+		fi
+		fi
+		checkopt_toolkit_gtk3
+		if [ $? -eq 0 ]; then
+			echo "  toolkit: gtk3" >> $TEMP_DIR/options
+			ERROR=0
+			break
+		fi
+		checkopt_toolkit_qt5
+		if [ $? -eq 0 ]; then
+			echo "  toolkit: qt5" >> $TEMP_DIR/options
+			ERROR=0
+			break
+		fi
+		checkopt_toolkit_gtk2
+		if [ $? -eq 0 ]; then
+			echo "  toolkit: gtk2" >> $TEMP_DIR/options
+			ERROR=0
+			break
+		fi
+		checkopt_toolkit_qt4
+		if [ $? -eq 0 ]; then
+			echo "  toolkit: qt4" >> $TEMP_DIR/options
+			ERROR=0
+			break
+		fi
+		checkopt_toolkit_motif
+		if [ $? -eq 0 ]; then
+			echo "  toolkit: motif" >> $TEMP_DIR/options
+			ERROR=0
+			break
+		fi
+		break
+	done
+	if [ $ERROR -ne 0 ]; then
+		SAVED_ERROR=1
+	fi
+	ERROR=$SAVED_ERROR
+	DEPENDENCIES_FAILED=$SAVED_DEPENDENCIES_FAILED=
+else
+	if false; then
+		false
+	elif [ $OPT_TOOLKIT = "gtk3" ]; then
+		echo "  toolkit: $OPT_TOOLKIT" >> $TEMP_DIR/options
+		checkopt_toolkit_gtk3
+		if [ $? -ne 0 ]; then
+			ERROR=1
+		fi
+	elif [ $OPT_TOOLKIT = "gtk2" ]; then
+		echo "  toolkit: $OPT_TOOLKIT" >> $TEMP_DIR/options
+		checkopt_toolkit_gtk2
+		if [ $? -ne 0 ]; then
+			ERROR=1
+		fi
+	elif [ $OPT_TOOLKIT = "gtk2legacy" ]; then
+		echo "  toolkit: $OPT_TOOLKIT" >> $TEMP_DIR/options
+		checkopt_toolkit_gtk2legacy
+		if [ $? -ne 0 ]; then
+			ERROR=1
+		fi
+	elif [ $OPT_TOOLKIT = "qt5" ]; then
+		echo "  toolkit: $OPT_TOOLKIT" >> $TEMP_DIR/options
+		checkopt_toolkit_qt5
+		if [ $? -ne 0 ]; then
+			ERROR=1
+		fi
+	elif [ $OPT_TOOLKIT = "qt4" ]; then
+		echo "  toolkit: $OPT_TOOLKIT" >> $TEMP_DIR/options
+		checkopt_toolkit_qt4
+		if [ $? -ne 0 ]; then
+			ERROR=1
+		fi
+	elif [ $OPT_TOOLKIT = "motif" ]; then
+		echo "  toolkit: $OPT_TOOLKIT" >> $TEMP_DIR/options
+		checkopt_toolkit_motif
+		if [ $? -ne 0 ]; then
+			ERROR=1
+		fi
+	fi
+fi
+
+echo >> $TEMP_DIR/config.mk
+if [ ! -z "${CFLAGS}" ]; then
+    echo "TK_CFLAGS  += $CFLAGS" >> $TEMP_DIR/config.mk
+fi
+if [ ! -z "${CXXFLAGS}" ]; then
+    echo "TK_CXXFLAGS += $CXXFLAGS" >> $TEMP_DIR/config.mk
+fi
+if [ ! -z "${LDFLAGS}" ]; then
+    echo "TK_LDFLAGS += $LDFLAGS" >> $TEMP_DIR/config.mk
+fi
+
+if [ $ERROR -ne 0 ]; then
+	echo
+	echo "Error: Unresolved dependencies"
+	echo $DEPENDENCIES_FAILED
+	rm -Rf $TEMP_DIR
+	exit 1
+fi
+
+echo "configure finished"
+echo
+echo "Build Config:"
+echo "  PREFIX:    $PREFIX"
+echo "  TOOLCHAIN: $TOOLCHAIN_NAME"
+echo "Options:"
+cat $TEMP_DIR/options
+echo
+cat $TEMP_DIR/config.mk $TEMP_DIR/make.mk > config.mk
+rm -Rf $TEMP_DIR
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/Makefile.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,54 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2013 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+# this makefile is invoked from the build root directory
+
+BUILD_ROOT = ./
+include config.mk
+
+BUILD_DIRS = build/bin build/lib
+BUILD_DIRS += build/application
+BUILD_DIRS += build/ui/common build/ui/$(TOOLKIT)
+
+all: $(BUILD_DIRS) ucx ui application
+	make/$(PACKAGE_SCRIPT)
+
+$(BUILD_DIRS):
+	mkdir -p $@
+
+ucx: FORCE
+	cd ucx; $(MAKE)
+
+ui: FORCE
+	cd ui; $(MAKE) all
+
+application: ui FORCE
+	cd application; $(MAKE)
+
+FORCE:
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/clang.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,9 @@
+#
+# clang toolchain config
+#
+
+CFLAGS = 
+LDFLAGS = 
+
+SHLIB_CFLAGS = -fPIC
+SHLIB_LDFLAGS = -shared
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/configure.vm	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,615 @@
+#!/bin/sh
+
+#foreach( $var in $vars )
+#if( $var.exec )
+${var.name}=`${var.value}`
+#else
+${var.name}=${var.value}
+#end
+#end
+
+#if ( ! $project.hasVar("PREFIX") )
+PREFIX=/usr
+#end
+#if ( ! $project.hasVar("EPREFIX") )
+EPREFIX=$PREFIX
+#end
+
+#if ( ! $project.hasVar("BINDIR") )
+BINDIR=
+#end
+#if ( ! $project.hasVar("SBINDIR") )
+SBINDIR=
+#end
+#if ( ! $project.hasVar("LIBDIR") )
+LIBDIR=
+#end
+#if ( ! $project.hasVar("LIBEXECDIR") )
+LIBEXECDIR=
+#end
+#if ( ! $project.hasVar("DATADIR") )
+DATADIR=
+#end
+#if ( ! $project.hasVar("SYSCONFDIR") )
+SYSCONFDIR=
+#end
+#if ( ! $project.hasVar("SHAREDSTATEDIR") )
+SHAREDSTATEDIR=
+#end
+#if ( ! $project.hasVar("LOCALSTATEDIR") )
+LOCALSTATEDIR=
+#end
+#if ( ! $project.hasVar("INCLUDEDIR") )
+INCLUDEDIR=
+#end
+#if ( ! $project.hasVar("INFODIR") )
+INFODIR=
+#end
+#if ( ! $project.hasVar("MANDIR") )
+MANDIR=
+#end
+
+OS=`uname -s`
+OS_VERSION=`uname -r`
+
+TEMP_DIR=".tmp-`uname -n`"
+mkdir -p $TEMP_DIR
+if [ $? -ne 0 ]; then
+	echo "Cannot create tmp dir"
+	echo "Abort"
+fi
+touch $TEMP_DIR/options
+touch $TEMP_DIR/features
+
+# features
+#foreach( $feature in $features )
+#if( ${feature.isDefault()} )
+${feature.getVarName()}=on
+#end
+#end
+
+# help text
+printhelp()
+{
+	echo "Usage: $0 [OPTIONS]..."
+	cat << __EOF__
+Installation directories:
+  --prefix=PREFIX         path prefix for architecture-independent files
+                          [/usr]
+  --exec-prefix=EPREFIX   path prefix for architecture-dependent files
+                          [PREFIX]
+
+  --bindir=DIR            user executables [EPREFIX/bin]
+  --sbindir=DIR           system admin executables [EPREFIX/sbin]
+  --libexecdir=DIR        program executables [EPREFIX/libexec]
+  --sysconfdir=DIR        system configuration files [PREFIX/etc]
+  --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
+  --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --libdir=DIR            object code libraries [EPREFIX/lib]
+  --includedir=DIR        C header files [PREFIX/include]
+  --datarootdir=DIR       read-only arch.-independent data root [PREFIX/share]
+  --datadir=DIR           read-only architecture-independent data [DATAROOTDIR]
+  --infodir=DIR           info documentation [DATAROOTDIR/info]
+  --mandir=DIR            man documentation [DATAROOTDIR/man]
+
+#if( $options.size() > 0 )
+Options:
+#foreach( $opt in $options )
+  --${opt.getArgument()}=${opt.getValuesString()}
+#end
+
+#end
+#if( $features.size() > 0 )
+Optional Features:
+#foreach( $feature in $features )
+#if( $feature.default )
+  --disable-${feature.arg}
+#else
+  --enable-${feature.arg}
+#end
+#end
+
+#end
+__EOF__
+}
+
+#
+# parse arguments 
+#
+#set( $D = '$' )
+for ARG in $@
+do
+    case "$ARG" in
+		"--prefix="*)         PREFIX=${D}{ARG#--prefix=} ;;
+		"--exec-prefix="*)    EPREFIX=${D}{ARG#--exec-prefix=} ;;
+		"--bindir="*)         BINDIR=${D}{ARG#----bindir=} ;;
+		"--sbindir="*)        SBINDIR=${D}{ARG#--sbindir=} ;;
+		"--libdir="*)         LIBDIR=${D}{ARG#--libdir=} ;;
+		"--libexecdir="*)     LIBEXECDIR=${D}{ARG#--libexecdir=} ;;
+		"--datadir="*)        DATADIR=${D}{ARG#--datadir=} ;;
+		"--sysconfdir="*)     SYSCONFDIR=${D}{ARG#--sysconfdir=} ;;
+		"--sharedstatedir="*) SHAREDSTATEDIR=${D}{ARG#--sharedstatedir=} ;;
+		"--localstatedir="*)  LOCALSTATEDIR=${D}{ARG#--localstatedir=} ;;
+		"--includedir="*)     INCLUDEDIR=${D}{ARG#--includedir=} ;;
+		"--infodir="*)        INFODIR=${D}{ARG#--infodir=} ;;
+		"--mandir"*)          MANDIR=${D}{ARG#--mandir} ;;
+		"--help"*) printhelp; exit 1 ;;
+	#foreach( $opt in $options )
+    	"--${opt.getArgument()}="*) ${opt.getVarName()}=${D}{ARG#--${opt.getArgument()}=} ;;
+    #end
+	#foreach( $feature in $features )
+		"--enable-${feature.arg}") ${feature.getVarName()}=on ;;
+		"--disable-${feature.arg}") unset ${feature.getVarName()} ;;
+	#end
+		"-"*) echo "unknown option: $ARG"; exit 1 ;;
+	esac
+done
+
+# set dir variables
+if [ -z "$BINDIR" ]; then
+	BINDIR=$EPREFIX/bin
+fi
+if [ -z "$SBINDIR" ]; then
+	SBINDIR=$EPREFIX/sbin
+fi
+if [ -z "$LIBDIR" ]; then
+	LIBDIR=$EPREFIX/lib
+fi
+if [ -z "$LIBEXEC" ]; then
+	LIBEXECDIR=$EPREFIX/libexec
+fi
+if [ -z "$DATADIR" ]; then
+	DATADIR=$PREFIX/share
+fi
+if [ -z "$SYSCONFDIR" ]; then
+	SYSCONFDIR=$PREFIX/etc
+fi
+if [ -z "$SHAREDSTATEDIR" ]; then
+	SHAREDSTATEDIR=$PREFIX/com
+fi
+if [ -z "$LOCALSTATEDIR" ]; then
+	LOCALSTATEDIR=$PREFIX/var
+fi
+if [ -z "$INCLUDEDIR" ]; then
+	INCLUDEDIR=$PREFIX/include
+fi
+if [ -z "$INFODIR" ]; then
+	INFODIR=$PREFIX/info
+fi
+if [ -z "$MANDIR" ]; then
+	MANDIR=$PREFIX/man
+fi
+
+which pkg-config > /dev/null
+if [ $? -eq 0 ]; then
+    PKG_CONFIG=pkg-config
+else
+    PKG_CONFIG=false
+fi
+
+# Simple uname based platform detection
+# $PLATFORM is used for platform dependent dependency selection
+printf "detect platform... "
+if [ $OS = SunOS ]; then
+    PLATFORM="solaris sunos unix svr4"
+fi
+if [ $OS = Linux ]; then
+    PLATFORM="linux unix"
+fi
+if [ $OS = FreeBSD ]; then
+    PLATFORM="freebsd bsd unix"
+fi
+if [ $OS = Darwin ]; then
+    PLATFORM="macos osx bsd unix"
+fi
+echo $OS | grep "MINGW" > /dev/null
+if [ $? -eq 0 ]; then
+    PLATFORM="windows mingw"
+fi
+
+if [ -z "$PLATFORM" ]; then
+    PLATFORM="unix"
+fi
+
+for p in $PLATFORM
+do
+	PLATFORM_NAME=$p
+	break
+done
+echo $PLATFORM_NAME
+
+isplatform()
+{
+    for p in $PLATFORM
+    do
+        if [ $p = $1 ]; then
+            return 0
+        fi
+    done
+    return 1
+}
+isnotplatform()
+{
+    for p in $PLATFORM
+    do
+        if [ $p = $1 ]; then
+            return 1
+        fi
+    done
+    return 0
+}
+
+# generate config.mk and config.h
+cat > $TEMP_DIR/config.mk << __EOF__
+#
+# config.mk generated by configure
+#
+
+# general vars
+#foreach( $var in $vars )
+${var.name}=$${var.name}
+#end
+
+#if ( ! $project.hasVar("PREFIX") )
+PREFIX=$PREFIX
+#end
+#if ( ! $project.hasVar("EPREFIX") )
+EPREFIX=$EPREFIX
+#end
+
+#if ( ! $project.hasVar("BINDIR") )
+BINDIR=$BINDIR
+#end
+#if ( ! $project.hasVar("SBINDIR") )
+SBINDIR=$SBINDIR
+#end
+#if ( ! $project.hasVar("LIBDIR") )
+LIBDIR=$LIBDIR
+#end
+#if ( ! $project.hasVar("LIBEXECDIR") )
+LIBEXECDIR=$LIBEXECDIR
+#end
+#if ( ! $project.hasVar("DATADIR") )
+DATADIR=$DATADIR
+#end
+#if ( ! $project.hasVar("SYSCONFDIR") )
+SYSCONFDIR=$SYSCONFDIR
+#end
+#if ( ! $project.hasVar("SHAREDSTATEDIR") )
+SHAREDSTATEDIR=$SHAREDSTATEDIR
+#end
+#if ( ! $project.hasVar("LOCALSTATEDIR") )
+LOCALSTATEDIR=$LOCALSTATEDIR
+#end
+#if ( ! $project.hasVar("INCLUDEDIR") )
+INCLUDEDIR=$INCLUDEDIR
+#end
+#if ( ! $project.hasVar("INFODIR") )
+INFODIR=$INFODIR
+#end
+#if ( ! $project.hasVar("MANDIR") )
+MANDIR=$MANDIR
+#end
+
+__EOF__
+
+echo > $TEMP_DIR/make.mk
+
+ENV_CFLAGS=$CFLAGS
+ENV_LDFLAGS=$LDFLAGS
+ENV_CXXFLAGS=$CXXFLAGS
+
+# Toolchain detection
+# this will insert make vars to config.mk
+. make/toolchain.sh
+
+# add user specified flags to config.mk
+echo >> $TEMP_DIR/config.mk
+if [ ! -z "${ENV_CFLAGS}" ]; then
+    echo "CFLAGS += $ENV_CFLAGS" >> $TEMP_DIR/config.mk
+fi
+if [ ! -z "${ENV_CXXFLAGS}" ]; then
+    echo "CXXFLAGS += $ENV_CXXFLAGS" >> $TEMP_DIR/config.mk
+fi
+if [ ! -z "${ENV_LDFLAGS}" ]; then
+    echo "LDFLAGS += $ENV_LDFLAGS" >> $TEMP_DIR/config.mk
+fi
+
+#
+# DEPENDENCIES
+#
+
+#foreach( $dependency in $namedDependencies )
+dependency_${dependency.name}()
+{
+    printf "checking for ${dependency.name}... "
+    #foreach( $sub in $dependency.getSubdependencies() )
+    # dependency $sub.name $sub.getPlatformString()
+    while true
+    do
+    	#if( $sub.platform )
+    	if isnotplatform "${sub.platform}"; then
+            break
+        fi
+    	#end
+		#foreach( $not in $sub.getNotList() )
+		if isplatform "${not}"; then
+            break
+        fi
+		#end
+        #if( $sub.pkgconfig.size() > 0 )
+        if [ -z "$PKG_CONFIG" ]; then
+        	break
+        fi
+        #end
+        #foreach( $pkg in $sub.pkgconfig )
+		$PKG_CONFIG $pkg.getPkgConfigParam()
+        if [ $? -ne 0 ] ; then
+            break
+        fi
+        CFLAGS="$CFLAGS `$PKG_CONFIG --cflags $pkg.getPkgConfigParam()`"
+        LDFLAGS="$LDFLAGS `$PKG_CONFIG --libs $pkg.getPkgConfigParam()`"
+        #end
+        #foreach( $flags in $sub.flags )
+        #if( $flags.exec )
+        $flags.value > /dev/null
+        if [ $? -eq 0 ]; then
+            $flags.varName="$$flags.varName `$flags.value`"
+        else
+            break
+        fi
+        #else
+        $flags.varName="$$flags.varName $flags.value"    
+        #end
+        #end
+        #foreach( $test in $sub.tests )
+        $test > /dev/null
+        if [ $? -ne 0 ]; then
+        	break
+        fi
+        #end
+		#if ( $sub.make.length() > 0 )
+		cat >> $TEMP_DIR/make.mk << __EOF__
+# Dependency: $dependency.name		
+$sub.make
+__EOF__
+        #end
+		echo yes
+        return 0
+    done
+	
+	#end
+	echo no
+	return 1
+}
+#end
+
+DEPENDENCIES_FAILED=
+ERROR=0
+#if( $dependencies.size() > 0 )
+# general dependencies
+CFLAGS=
+LDFLAGS=
+#foreach( $dependency in $dependencies )
+while true
+do
+	#if( $dependency.platform )
+    if isnotplatform "${dependency.platform}"; then
+        break
+    fi
+    #end
+	#foreach( $not in $dependency.getNotList() )
+    if isplatform "${not}"; then
+        break
+    fi
+	#end
+    while true
+    do
+        #if( $dependency.pkgconfig.size() > 0 )
+        if [ -z "$PKG_CONFIG" ]; then
+            ERROR=1
+            break
+        fi
+        #end
+        #foreach( $pkg in $dependency.pkgconfig )
+        printf "checking for pkg-config package $pkg.getPkgConfigParam()... "
+		$PKG_CONFIG $pkg.getPkgConfigParam()
+        if [ $? -ne 0 ]; then
+            echo no
+            ERROR=1
+            break
+        fi
+        echo yes
+        CFLAGS="$CFLAGS `$PKG_CONFIG --cflags $pkg.getPkgConfigParam()`"
+        LDFLAGS="$LDFLAGS `$PKG_CONFIG --libs $pkg.getPkgConfigParam()`"
+        #end
+        
+        #foreach( $flags in $dependency.flags )
+        #if( $flags.exec )
+        $flags.value > /dev/null
+        if [ $? -ne 0 ]; then
+            $flags.varName="$$flags.varName `$flags.value`"
+        else
+            ERROR=1
+            break
+        fi
+        #else
+        $flags.varName="$$flags.varName $flags.value"    
+        #end
+        #end
+		#if ( $dependency.make.length() > 0 )
+		cat >> $TEMP_DIR/make.mk << __EOF__
+$dependency.make
+__EOF__
+        #end
+        
+        break
+    done
+    
+    break
+done
+#end
+
+# add general dependency flags to config.mk
+echo >> $TEMP_DIR/config.mk
+if [ ! -z "${CFLAGS}" ]; then
+    echo "CFLAGS += $CFLAGS" >> $TEMP_DIR/config.mk
+fi
+if [ ! -z "${CXXFLAGS}" ]; then
+    echo "CXXFLAGS += $CXXFLAGS" >> $TEMP_DIR/config.mk
+fi
+if [ ! -z "${LDFLAGS}" ]; then
+    echo "LDFLAGS += $LDFLAGS" >> $TEMP_DIR/config.mk
+fi
+#end
+
+#
+# OPTION VALUES
+#
+#foreach( $opt in $options )
+#foreach( $val in $opt.values )
+${val.func}()
+{
+	VERR=0
+	#foreach( $dep in $val.dependencies )
+	dependency_$dep
+	if [ $? -ne 0 ]; then
+		VERR=1
+	fi
+	#end
+	if [ $VERR -ne 0 ]; then
+		return 1
+	fi
+	#foreach( $def in $val.defines )
+		CFLAGS="$CFLAGS ${def.toFlags()}"
+	#end
+	#if( $val.hasMake() )
+	cat >> $TEMP_DIR/make.mk << __EOF__
+$val.make
+__EOF__
+	#end
+	return 0
+}
+#end
+#end
+
+#
+# TARGETS
+#
+CFLAGS=
+CXXFLAGS=
+LDFLAGS=
+
+#foreach( $target in $targets )
+#if ( $target.name )
+# Target: $target.name
+#else
+# Target
+#end
+CFLAGS=
+LDFLAGS=
+CXXFLAGS=
+
+#foreach( $dependency in $target.dependencies )
+dependency_$dependency
+if [ $? -ne 0 ]; then
+	DEPENDENCIES_FAILED="$DEPENDENCIES_FAILED ${dependency} "
+	ERROR=1
+fi
+#end
+
+# Features
+#foreach( $feature in $target.features )
+if [ ! -z "$${feature.getVarName()}" ]; then
+#foreach( $dependency in $feature.dependencies )
+	# check dependency
+	dependency_$dependency
+	if [ $? -ne 0 ]; then
+		# "auto" features can fail and are just disabled in this case
+		if [ $${feature.getVarName()} != "auto" ]; then
+			DEPENDENCIES_FAILED="$DEPENDENCIES_FAILED ${dependency} "
+			ERROR=1
+		fi
+	fi
+#end
+fi
+#end
+
+#foreach( $opt in $target.options )
+# Option: --${opt.argument}
+if [ -z ${D}${opt.getVarName()} ]; then
+	SAVED_ERROR=$ERROR
+	SAVED_DEPENDENCIES_FAILED=$DEPENDENCIES_FAILED
+	ERROR=0
+	while true
+	do
+		#foreach( $optdef in $opt.defaults )
+		#if( $optdef.platform )
+		if isplatform "$optdef.platform"; then
+		#end
+		$optdef.func
+		if [ $? -eq 0 ]; then
+			echo "  ${opt.argument}: ${optdef.valueName}" >> $TEMP_DIR/options
+			ERROR=0
+			break
+		fi
+		#if( $optdef.platform )
+		fi
+		#end
+		#end
+		break
+	done
+	if [ $ERROR -ne 0 ]; then
+		SAVED_ERROR=1
+	fi
+	ERROR=$SAVED_ERROR
+	DEPENDENCIES_FAILED=$SAVED_DEPENDENCIES_FAILED=
+else
+	if false; then
+		false
+	#foreach( $optval in $opt.values )
+	elif [ ${D}${opt.getVarName()} = "${optval.value}" ]; then
+		echo "  ${opt.argument}: ${D}${opt.getVarName()}" >> $TEMP_DIR/options
+		$optval.func
+		if [ $? -ne 0 ]; then
+			ERROR=1
+		fi
+	#end
+	fi
+fi
+#end
+
+echo >> $TEMP_DIR/config.mk
+if [ ! -z "${CFLAGS}" ]; then
+    echo "${target.getCFlags()}  += $CFLAGS" >> $TEMP_DIR/config.mk
+fi
+if [ ! -z "${CXXFLAGS}" ]; then
+    echo "${target.getCXXFlags()} += $CXXFLAGS" >> $TEMP_DIR/config.mk
+fi
+if [ ! -z "${LDFLAGS}" ]; then
+    echo "${target.getLDFlags()} += $LDFLAGS" >> $TEMP_DIR/config.mk
+fi
+
+#end
+if [ $ERROR -ne 0 ]; then
+	echo
+	echo "Error: Unresolved dependencies"
+	echo $DEPENDENCIES_FAILED
+	rm -Rf $TEMP_DIR
+	exit 1
+fi
+
+echo "configure finished"
+echo
+echo "Build Config:"
+echo "  PREFIX:    $PREFIX"
+echo "  TOOLCHAIN: $TOOLCHAIN_NAME"
+#if ( $options.size() > 0 )
+echo "Options:"
+cat $TEMP_DIR/options
+#end
+echo
+cat $TEMP_DIR/config.mk $TEMP_DIR/make.mk > config.mk
+rm -Rf $TEMP_DIR
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/gcc.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,10 @@
+#
+# gcc toolchain config
+#
+
+CFLAGS = 
+LDFLAGS = 
+
+SHLIB_CFLAGS = -fPIC
+SHLIB_LDFLAGS = -shared
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/mingw.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,46 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2011 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+CC = gcc
+LD = gcc
+AR = ar
+RM = rm
+MSBUILD = MSBuild.exe
+
+CFLAGS  = -std=gnu99 -c -O2 -m64
+COFLAGS = -o
+LDFLAGS = 
+LOFLAGS = -o
+ARFLAGS = -r
+RMFLAGS = -f
+
+OBJ_EXT = o
+LIB_EXT = a
+APP_EXT = .exe
+
+PACKAGE_SCRIPT = package_windows.sh
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/osx.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,43 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2011 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+CC = gcc
+LD = gcc
+AR = ar
+RM = rm
+
+CFLAGS  += -std=gnu99 -g -I/usr/include/libxml2
+LDFLAGS += -lxml2 -lz -lpthread -licucore -lm
+ARFLAGS = -r
+RMFLAGS = -f
+
+OBJ_EXT = o
+LIB_EXT = a
+APP_EXT =
+
+PACKAGE_SCRIPT = package_osx.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/package_osx.sh	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# create .app
+rm -Rf build/mk12.app
+cp -R resource/template.app build/mk12.app
+
+mkdir -p build/mk12.app/Contents/MacOS/
+
+cp build/bin/mk12 build/mk12.app/Contents/MacOS/
+
+cp -R resource/locales build/mk12.app/Contents/Resources/
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/package_unix.sh	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,2 @@
+#!/bin/sh
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/package_windows.sh	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,2 @@
+#!/bin/sh
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/project.xml	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,109 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project>
+	<!--
+	<dependency name="gtk4">
+		<pkgconfig>gtk+-4.0</pkgconfig>
+		<cflags>-DUI_GTK3</cflags>
+		<ldflags>-lpthread</ldflags>
+	</dependency>
+	-->
+	<dependency name="gtk3">
+		<pkgconfig>gtk+-3.0</pkgconfig>
+		<cflags>-DUI_GTK3</cflags>
+		<ldflags>-lpthread</ldflags>
+	</dependency>
+	<dependency name="gtk2">
+		<test>pkg-config --atleast-version=2.20 gtk+-2.0</test>
+		<pkgconfig>gtk+-2.0</pkgconfig>
+		<cflags>-DUI_GTK2</cflags>
+		<ldflags>-lpthread</ldflags>
+	</dependency>
+	<dependency name="gtk2legacy">
+		<pkgconfig>gtk+-2.0</pkgconfig>
+		<cflags>-DUI_GTK2 -DUI_GTK2LEGACY</cflags>
+		<ldflags>-lpthread</ldflags>
+	</dependency>
+	<dependency name="wpf" platform="windows">
+		<cflags>-DUI_WPF</cflags>
+	</dependency>
+	<dependency name="qt4">
+		<test>which qmake-qt4</test>
+		<cflags type="exec">qmake-qt4 -o - /dev/null | grep DEFINES\ </cflags>
+		<cflags type="exec">qmake-qt4 -o - /dev/null | grep INCPATH\ </cflags>
+		<ldflags type="exec"><cflags type="exec">qmake-qt4 -o - /dev/null | grep LIBS\ </cflags></ldflags>
+	</dependency>
+	<dependency name="qt5">
+		<test>which qmake-qt5</test>
+		<cflags type="exec">qmake-qt5 -o - /dev/null | grep DEFINES\ </cflags>
+		<cflags type="exec">qmake-qt5 -o - /dev/null | grep INCPATH\ </cflags>
+		<ldflags type="exec"><cflags type="exec">qmake-qt5 -o - /dev/null | grep LIBS\ </cflags></ldflags>
+	</dependency>
+	<dependency name="cocoa" platform="macos">
+		<cflags>-DUI_COCOA</cflags>
+		<ldflags>-lobjc -framework Cocoa</ldflags>
+	</dependency>
+	<dependency name="motif">
+		<cflags>-DUI_MOTIF</cflags>
+		<ldflags>-lXm -lXt -lX11 -lpthread</ldflags>
+	</dependency>
+	
+	<dependency platform="macos">
+		<make>OBJ_EXT = o</make>
+		<make>LIB_EXT = a</make>
+		<make>PACKAGE_SCRIPT = package_osx.sh</make>
+	</dependency>
+	<dependency platform="unix" not="macos">
+		<make>OBJ_EXT = o</make>
+		<make>LIB_EXT = a</make>
+		<make>PACKAGE_SCRIPT = package_unix.sh</make>
+	</dependency>
+	
+	<target name="tk">
+		<option arg="toolkit">
+			<!--
+			<value str="gtk4">
+				<dependencies>gtk4</dependencies>
+				<make>TOOLKIT = gtk</make>
+				<make>GTKOBJ = draw_cairo.o</make>
+			</value>
+			-->
+			<value str="gtk3">
+				<dependencies>gtk3</dependencies>
+				<make>TOOLKIT = gtk</make>
+				<make>GTKOBJ = draw_cairo.o</make>
+			</value>
+			<value str="gtk2">
+				<dependencies>gtk2</dependencies>
+				<make>TOOLKIT = gtk</make>
+				<make>GTKOBJ = draw_cairo.o</make>
+			</value>
+			<value str="gtk2legacy">
+				<dependencies>gtk2legacy</dependencies>
+				<make>TOOLKIT = gtk</make>
+				<make>GTKOBJ = draw_gdk.o</make>
+			</value>
+			<value str="qt5">
+				<dependencies>qt5</dependencies>
+				<make>TOOLKIT = qt</make>
+				<make>LD = $(CXX)</make>
+			</value>
+			<value str="qt4">
+				<dependencies>qt4</dependencies>
+				<make>TOOLKIT = qt</make>
+				<make>LD = $(CXX)</make>
+			</value>
+			<value str="motif">
+				<dependencies>motif</dependencies>
+				<make>TOOLKIT = motif</make>
+			</value>
+			<default value="wpf" platform="windows" />
+			<default value="cocoa" platform="macos" />
+			<default value="gtk3" />
+			<default value="qt5" />
+			<default value="gtk2" />
+			<default value="qt4" />
+			<default value="motif" />
+		</option>
+	</target>
+</project>
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/suncc.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,10 @@
+#
+# suncc toolchain
+#
+
+CFLAGS = 
+LDFLAGS = 
+
+SHLIB_CFLAGS = -Kpic
+SHLIB_LDFLAGS = -G
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/toolchain.sh	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,181 @@
+#!/bin/sh
+#
+# toolchain detection
+#
+
+C_COMPILERS="cc gcc clang suncc"
+CPP_COMPILERS="CC g++ clang++ sunCC"
+unset CC_ARG_CHECKED
+unset TOOLCHAIN_DETECTION_ERROR
+unset TOOLCHAIN_NAME
+
+check_c_compiler()
+{
+	cat > $TEMP_DIR/test.c << __EOF__
+/* test file */
+#include <stdio.h>
+int main(int argc, char **argv) {
+#if defined(__clang__)
+	printf("clang\n");
+#elif defined(__GNUC__)
+	printf("gcc\n");
+#elif defined(__sun)
+	printf("suncc\n");
+#else
+	printf("unknown\n");
+#endif
+	return 0;
+}
+__EOF__
+	rm -f $TEMP_DIR/checkcc
+	$1 -o $TEMP_DIR/checkcc $CFLAGS $LDFLAGS $TEMP_DIR/test.c 2> /dev/null
+	
+	if [ $? -ne 0 ]; then
+		return 1
+	fi
+	return 0
+}
+
+check_cpp_compiler()
+{
+	cat > $TEMP_DIR/test.cpp << __EOF__
+/* test file */
+#include <iostream>
+int main(int argc, char **argv) {
+#if defined(__clang__)
+	std::cout << "clang" << std::endl;
+#elif defined(__GNUC__)
+	std::cout << "gcc" << std::endl;
+#elif defined(__sun)
+	std::cout << "suncc" << std::endl;
+#else
+	std::cout << "unknown" << std::endl;
+#endif
+	return 0;
+}
+__EOF__
+	rm -f $TEMP_DIR/checkcc
+	$1 -o $TEMP_DIR/checkcc $CXXFLAGS $LDFLAGS $TEMP_DIR/test.cpp 2> /dev/null
+	
+	if [ $? -ne 0 ]; then
+		return 1
+	fi
+	return 0
+}
+
+printf "detect C compiler... "
+
+for COMP in $C_COMPILERS
+do
+	check_c_compiler $COMP
+	if [ $? -ne 0 ]; then
+		if [ ! -z "$CC" ]; then
+			if [ $COMP = $CC ]; then
+				echo "$CC is not a working C Compiler"
+				TOOLCHAIN_DETECTION_ERROR="error"
+				break
+			fi
+		fi
+	else
+		TOOLCHAIN_NAME=`$TEMP_DIR/checkcc`
+		USE_TOOLCHAIN=$TOOLCHAIN_NAME
+		if [ $COMP = "cc" ]; then
+			# we have found a working compiler, but in case
+			# the compiler is gcc or clang, we try to use
+			# these commands and not 'cc'
+			TOOLCHAIN_NAME=`$TEMP_DIR/checkcc`
+			if [ $TOOLCHAIN_NAME = "gcc" ]; then
+				check_c_compiler "gcc"
+				if [ $? -eq 0 ]; then
+					COMP=gcc
+					USE_TOOLCHAIN="gcc"
+				fi
+			fi
+			if [ $TOOLCHAIN_NAME = "clang" ]; then
+				check_c_compiler "clang"
+				if [ $? -eq 0 ]; then
+					COMP=clang
+					USE_TOOLCHAIN="clang"
+				fi
+			fi
+		fi
+		
+		TOOLCHAIN_NAME=$USE_TOOLCHAIN
+		TOOLCHAIN_CC=$COMP
+		echo $COMP
+		break
+	fi
+done
+if [ -z $TOOLCHAIN_CC ]; then
+	echo "not found"
+fi
+
+printf "detect C++ compiler... "
+
+for COMP in $CPP_COMPILERS
+do
+	check_cpp_compiler $COMP
+	if [ $? -ne 0 ]; then
+		if [ ! -z "$CXX" ]; then
+			if [ $COMP = $CXX ]; then
+				echo "$CC is not a working C++ Compiler"
+				TOOLCHAIN_DETECTION_ERROR="error"
+				break
+			fi
+		fi
+	else
+		if [ $COMP = "CC" ]; then
+			# we have found a working compiler, but in case
+			# the compiler is gcc or clang, we try to use
+			# these commands and not 'cc'
+			TOOLCHAIN_NAME=`$TEMP_DIR/checkcc`
+			USE_TOOLCHAIN=$TOOLCHAIN_NAME
+			if [ $TOOLCHAIN_NAME = "gcc" ]; then
+				check_cpp_compiler "g++"
+				if [ $? -eq 0 ]; then
+				   COMP=g++
+				   USE_TOOLCHAIN="gcc"
+				fi
+			fi
+			if [ $TOOLCHAIN_NAME = "clang" ]; then
+				check_cpp_compiler "clang++"
+				if [ $? -eq 0 ]; then
+				   COMP=clang++
+				   USE_TOOLCHAIN="clang"
+				fi
+			fi
+		fi
+		
+		TOOLCHAIN_NAME=$USE_TOOLCHAIN
+		TOOLCHAIN_CXX=$COMP
+		echo $COMP
+		break
+	fi
+done
+if [ -z $TOOLCHAIN_CXX ]; then
+	echo "not found"
+fi
+
+TOOLCHAIN_LD=$TOOLCHAIN_CC
+
+if [ -z "$TOOLCHAIN_NAME" ]; then
+	TOOLCHAIN_DETECTION_ERROR="error"
+else
+	cat >> $TEMP_DIR/config.mk << __EOF__
+# toolchain
+__EOF__
+	echo "CC = ${TOOLCHAIN_CC}" >> $TEMP_DIR/config.mk
+	if [ ! -z "$TOOLCHAIN_CXX" ]; then
+		echo "CXX = ${TOOLCHAIN_CXX}" >> $TEMP_DIR/config.mk
+	fi
+	echo "LD = ${TOOLCHAIN_LD}" >> $TEMP_DIR/config.mk
+	echo >> $TEMP_DIR/config.mk
+	
+	cat "make/${TOOLCHAIN_NAME}.mk" > /dev/null 2>&1
+	if [ $? -eq 0 ]; then 
+		echo "include \$(BUILD_ROOT)/make/${TOOLCHAIN_NAME}.mk" >> $TEMP_DIR/config.mk
+	else
+		echo "SHLIB_CFLAGS = -fPIC" >> $TEMP_DIR/config.mk
+		echo "SHLIB_LDFLAGS = -shared" >> $TEMP_DIR/config.mk
+	fi
+fi
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/windows.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,42 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2011 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+CC = gcc
+LD = gcc
+AR = ar
+RM = rm
+
+CFLAGS  = -std=gnu99
+LDFLAGS = 
+ARFLAGS = -r
+RMFLAGS = -f
+
+OBJ_EXT = obj
+LIB_EXT = lib
+APP_EXT = .exe
+
Binary file resource/.DS_Store has changed
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/resource/locales/de_DE.properties	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,1 @@
+hello = HALLO WELT!
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/resource/locales/en_EN.properties	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,1 @@
+hello = HELLO WORLD!
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/resource/template.app/Contents/Info.plist	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>BuildMachineOSBuild</key>
+	<string>10K549</string>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>de_DE</string>
+	<key>CFBundleExecutable</key>
+	<string>mk12</string>
+	<key>CFBundleIdentifier</key>
+	<string>com.yourcompany.toolkit</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>toolkit</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>DTCompiler</key>
+	<string></string>
+	<key>DTPlatformBuild</key>
+	<string>10M2518</string>
+	<key>DTPlatformVersion</key>
+	<string>PG</string>
+	<key>DTSDKBuild</key>
+	<string>10M2518</string>
+	<key>DTSDKName</key>
+	<string>macosx10.6</string>
+	<key>DTXcode</key>
+	<string>0400</string>
+	<key>DTXcodeBuild</key>
+	<string>10M2518</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>10.7</string>
+	<key>NSMainNibFile</key>
+	<string>MainMenu</string>
+	<key>CFBundleDisplayName</key>
+	<string></string>
+	<key>CFBundleGetInfoString</key>
+	<string></string>
+	<key>LSApplicationCategoryType</key>
+	<string></string>
+	<key>CFBundleDocumentTypes</key>
+	<array>
+		<dict>
+			<key>LSItemContentTypes</key>
+			<array>
+				<string>public.data</string>
+			</array>
+			<key>CFBundleTypeIconFile</key>
+			<string></string>
+			<key>CFBundleTypeName</key>
+			<string>DocumentType</string>
+			<key>CFBundleTypeRole</key>
+			<string>Editor</string>
+<!--
+			<key>NSDocumentClass</key>
+			<string>Document</string>
+-->
+		</dict>
+	</array>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+</dict>
+</plist>
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/resource/template.app/Contents/PkgInfo	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,1 @@
+APPL????
\ No newline at end of file
Binary file resource/template.app/Contents/Resources/English.lproj/InfoPlist.strings has changed
Binary file resource/template.app/Contents/Resources/English.lproj/MainMenu.nib has changed
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/Makefile	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,62 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2013 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+BUILD_ROOT = ../
+include ../config.mk
+
+# list of source files
+SRC  = utils.c
+SRC += list.c
+SRC += map.c
+SRC += avl.c
+SRC += properties.c
+SRC += mempool.c
+SRC += string.c
+SRC += test.c
+SRC += allocator.c
+SRC += logging.c
+SRC += buffer.c
+SRC += stack.c
+SRC += ucx.c
+SRC += array.c
+
+OBJ   = $(SRC:%.c=../build/ucx/%.$(OBJ_EXT))
+
+UCX_LIB = ../build/lib/libucx.$(LIB_EXT)
+
+all: ../build/ucx $(UCX_LIB)
+
+$(UCX_LIB): $(OBJ)
+	$(AR) $(ARFLAGS) $(UCX_LIB) $(OBJ)
+
+../build/ucx:
+	mkdir -p ../build/ucx
+
+../build/ucx/%.$(OBJ_EXT): %.c
+	$(CC) $(CFLAGS) -o $@ -c $<
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/README	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,4 @@
+UCX is a library for common data structures, algorithms and string functions.
+
+More informations at: https://develop.uap-core.de/ucx/
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/allocator.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,60 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/allocator.h"
+
+#include <stdlib.h>
+
+static UcxAllocator default_allocator = {
+    NULL,
+    ucx_default_malloc,
+    ucx_default_calloc,
+    ucx_default_realloc,
+    ucx_default_free
+};
+
+UcxAllocator *ucx_default_allocator() {
+    UcxAllocator *allocator = &default_allocator;
+    return allocator;
+}
+
+void *ucx_default_malloc(void *ignore, size_t n) {
+    return malloc(n);
+}
+
+void *ucx_default_calloc(void *ignore, size_t n, size_t size) {
+    return calloc(n, size);
+}
+
+void *ucx_default_realloc(void *ignore, void *data, size_t n) {
+    return realloc(data, n);
+}
+
+void ucx_default_free(void *ignore, void *data) {
+    free(data);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/array.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,467 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2019 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#define _GNU_SOURCE /* we want to use qsort_r(), if available */
+#define __STDC_WANT_LIB_EXT1__ 1 /* use qsort_s, if available */
+
+
+#include "ucx/array.h"
+#include "ucx/utils.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#ifndef UCX_ARRAY_DISABLE_QSORT
+#ifdef __GLIBC__
+#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8)
+#define ucx_array_sort_impl qsort_r
+#endif /* glibc version >= 2.8 */
+#elif /* not  __GLIBC__ */ defined(__APPLE__) || defined(__FreeBSD__)
+#define ucx_array_sort_impl ucx_qsort_r
+#define USE_UCX_QSORT_R
+#elif /* not (__APPLE || __FreeBSD__) */ defined(__sun)
+#if __STDC_VERSION__ >= 201112L
+#define ucx_array_sort_impl qsort_s
+#endif
+#endif /* __GLIBC__, __APLE__, __FreeBSD__, __sun */
+#endif /* UCX_ARRAY_DISABLE_QSORT */
+
+#ifndef ucx_array_sort_impl
+#define ucx_array_sort_impl ucx_mergesort
+#endif
+
+static int ucx_array_ensurecap(UcxArray *array, size_t reqcap) {
+    size_t required_capacity = array->capacity;
+    while (reqcap > required_capacity) {
+        if (required_capacity * 2 < required_capacity)
+            return 1;
+        required_capacity <<= 1;
+    }
+    if (ucx_array_reserve(array, required_capacity)) {
+        return 1;
+    }
+    return 0;
+}
+
+int ucx_array_util_set_a(UcxAllocator* alloc, void** array, size_t* capacity,
+    size_t elmsize, size_t index, void* data) {
+    
+    if(!alloc || !capacity || !array) {
+        errno = EINVAL;
+        return 1;
+    }
+    
+    size_t newcapacity = *capacity;
+    while(index >= newcapacity) {
+        if(ucx_szmul(newcapacity, 2, &newcapacity)) {
+            errno = EOVERFLOW;
+            return 1;
+        }        
+    }
+
+    size_t memlen, offset;
+    if(ucx_szmul(newcapacity, elmsize, &memlen)) {
+        errno = EOVERFLOW;
+        return 1;
+    }
+    /* we don't need to check index*elmsize - it is smaller than memlen */
+    
+    
+    void* newptr = alrealloc(alloc, *array, memlen);
+    if(newptr == NULL) {
+        errno = ENOMEM; /* we cannot assume that every allocator sets this */
+        return 1;
+    }
+    *array = newptr;
+    *capacity = newcapacity;
+    
+    
+    char* dest = *array;
+    dest += elmsize*index;
+    memcpy(dest, data, elmsize);
+    
+    return 0;
+}
+
+int ucx_array_util_setptr_a(UcxAllocator* alloc, void** array, size_t* capacity,
+    size_t index, void* data) {
+    
+    return ucx_array_util_set_a(alloc, array, capacity, sizeof(void*),
+            index, &data);
+}
+
+UcxArray* ucx_array_new(size_t capacity, size_t elemsize) {
+    return ucx_array_new_a(capacity, elemsize, ucx_default_allocator());
+}
+
+UcxArray* ucx_array_new_a(size_t capacity, size_t elemsize,
+        UcxAllocator* allocator) {
+    UcxArray* array = almalloc(allocator, sizeof(UcxArray));
+    if(array) {
+        ucx_array_init_a(array, capacity, elemsize, allocator);
+    }
+    return array;
+}
+
+void ucx_array_init(UcxArray* array, size_t capacity, size_t elemsize) {
+    ucx_array_init_a(array, capacity, elemsize, ucx_default_allocator());
+}
+
+void ucx_array_init_a(UcxArray* array, size_t capacity, size_t elemsize,
+        UcxAllocator* allocator) {
+    
+    array->allocator = allocator;
+    array->elemsize = elemsize;
+    array->size = 0;
+    array->data = alcalloc(allocator, capacity, elemsize);
+    
+    if (array->data) {
+        array->capacity = capacity;
+    } else {
+        array->capacity = 0;
+    }
+}
+
+int ucx_array_clone(UcxArray* dest, UcxArray const* src) {
+    if (ucx_array_ensurecap(dest, src->capacity)) {
+        return 1;
+    }
+    
+    dest->elemsize = src->elemsize;
+    dest->size = src->size;
+    
+    if (dest->data) {
+        memcpy(dest->data, src->data, src->size*src->elemsize);
+    }
+    
+    return 0;
+}
+
+int ucx_array_equals(UcxArray const *array1, UcxArray const *array2,
+        cmp_func cmpfnc, void* data) {
+    
+    if (array1->size != array2->size || array1->elemsize != array2->elemsize) {
+        return 0;
+    } else {
+        if (array1->size == 0)
+            return 1;
+        
+        size_t elemsize;
+        if (cmpfnc == NULL) {
+            cmpfnc = ucx_cmp_mem;
+            elemsize = array1->elemsize;
+            data = &elemsize;
+        }
+        
+        for (size_t i = 0 ; i < array1->size ; i++) {
+            int r = cmpfnc(
+                    ucx_array_at(array1, i),
+                    ucx_array_at(array2, i),
+                    data);
+            if (r != 0)
+                return 0;
+        }
+        return 1;
+    }
+}
+
+void ucx_array_destroy(UcxArray *array) {
+    if(array->data)
+        alfree(array->allocator, array->data);
+    array->data = NULL;
+    array->capacity = array->size = 0;
+}
+
+void ucx_array_free(UcxArray *array) {
+    ucx_array_destroy(array);
+    alfree(array->allocator, array);
+}
+
+int ucx_array_append_from(UcxArray *array, void *data, size_t count) {
+    if (ucx_array_ensurecap(array, array->size + count))
+        return 1;
+    
+    void* dest = ucx_array_at(array, array->size);
+    if (data) {
+        memcpy(dest, data, array->elemsize*count);
+    } else {
+        memset(dest, 0, array->elemsize*count);
+    }
+    array->size += count;
+    
+    return 0;
+}
+
+int ucx_array_prepend_from(UcxArray *array, void *data, size_t count) {
+    if (ucx_array_ensurecap(array, array->size + count))
+        return 1;
+    
+    if (array->size > 0) {
+        void *dest = ucx_array_at(array, count);
+        memmove(dest, array->data, array->elemsize*array->size);
+    }
+    
+    if (data) {
+        memcpy(array->data, data, array->elemsize*count);
+    } else {
+        memset(array->data, 0, array->elemsize*count);
+    }
+    array->size += count;
+        
+    return 0;
+}
+
+int ucx_array_set_from(UcxArray *array, size_t index,
+        void *data, size_t count) {
+    if (ucx_array_ensurecap(array, index + count))
+        return 1;
+    
+    if (index+count > array->size) {
+        array->size = index+count;
+    }
+    
+    void *dest = ucx_array_at(array, index);
+    if (data) {
+        memcpy(dest, data, array->elemsize*count);
+    } else {
+        memset(dest, 0, array->elemsize*count);
+    }
+    
+    return 0;
+}
+
+int ucx_array_concat(UcxArray *array1, const UcxArray *array2) {
+    
+    if (array1->elemsize != array2->elemsize)
+        return 1;
+    
+    size_t capacity = array1->capacity+array2->capacity;
+        
+    if (array1->capacity < capacity) {
+        if (ucx_array_reserve(array1, capacity)) {
+            return 1;
+        }
+    }
+    
+    void* dest = ucx_array_at(array1, array1->size);
+    memcpy(dest, array2->data, array2->size*array2->elemsize);
+    
+    array1->size += array2->size;
+    
+    return 0;
+}
+
+void *ucx_array_at(UcxArray const *array, size_t index) {
+    char* memory = array->data;
+    char* loc = memory + index*array->elemsize;
+    return loc;
+}
+
+size_t ucx_array_find(UcxArray const *array, void *elem,
+        cmp_func cmpfnc, void *data) {
+    
+    size_t elemsize;
+    if (cmpfnc == NULL) {
+        cmpfnc = ucx_cmp_mem;
+        elemsize = array->elemsize;
+        data = &elemsize;
+    }
+
+    if (array->size > 0) {
+        for (size_t i = 0 ; i < array->size ; i++) {
+            void* ptr = ucx_array_at(array, i);
+            if (cmpfnc(ptr, elem, data) == 0) {
+                return i;
+            }
+        }
+        return array->size;
+    } else {
+        return 0;
+    }
+}
+
+int ucx_array_contains(UcxArray const *array, void *elem,
+        cmp_func cmpfnc, void *data) {
+    return ucx_array_find(array, elem, cmpfnc, data) != array->size;
+}
+
+static void ucx_mergesort_merge(void *arrdata,size_t elemsize,
+        cmp_func cmpfnc, void *data,
+        size_t start, size_t mid, size_t end) { 
+    
+    char* array = arrdata;
+    
+    size_t rightstart = mid + 1; 
+  
+    if (cmpfnc(array + mid*elemsize,
+            array + rightstart*elemsize, data) <= 0) {
+        /* already sorted */
+        return;
+    }
+  
+    /* we need memory for one element */
+    void *value = malloc(elemsize);
+    
+    while (start <= mid && rightstart <= end) { 
+        if (cmpfnc(array + start*elemsize,
+                array + rightstart*elemsize, data) <= 0) { 
+            start++; 
+        } else {
+            /* save the value from the right */
+            memcpy(value, array + rightstart*elemsize, elemsize);
+                        
+            /* shift all left elements one element to the right */
+            size_t shiftcount = rightstart-start;
+            void *startptr = array + start*elemsize;
+            void *dest = array + (start+1)*elemsize;
+            memmove(dest, startptr, shiftcount*elemsize);
+            
+            /* bring the first value from the right to the left */
+            memcpy(startptr, value, elemsize);
+  
+            start++; 
+            mid++; 
+            rightstart++; 
+        }
+    }
+    
+    /* free the temporary memory */
+    free(value);
+} 
+  
+static void ucx_mergesort_impl(void *arrdata, size_t elemsize,
+        cmp_func cmpfnc, void *data, size_t l, size_t r) { 
+    if (l < r) {
+        size_t m = l + (r - l) / 2; 
+  
+        ucx_mergesort_impl(arrdata, elemsize, cmpfnc, data, l, m); 
+        ucx_mergesort_impl(arrdata, elemsize, cmpfnc, data, m + 1, r); 
+        ucx_mergesort_merge(arrdata, elemsize, cmpfnc, data, l, m, r);
+    } 
+}
+
+static void ucx_mergesort(void *arrdata, size_t count, size_t elemsize,
+        cmp_func cmpfnc, void *data) {
+    
+    ucx_mergesort_impl(arrdata, elemsize, cmpfnc, data, 0, count-1);
+}
+
+#ifdef USE_UCX_QSORT_R
+struct cmpfnc_swapargs_info {
+    cmp_func func;
+    void *data;
+};
+
+static int cmp_func_swap_args(void *data, const void *x, const void *y) {
+    struct cmpfnc_swapargs_info* info = data;
+    return info->func(x, y, info->data);
+}
+
+static void ucx_qsort_r(void *array, size_t count, size_t elemsize,
+		     cmp_func cmpfnc, void *data) {
+    struct cmpfnc_swapargs_info info;
+    info.func = cmpfnc;
+    info.data = data;
+    qsort_r(array, count, elemsize, &info, cmp_func_swap_args);
+}
+#endif /* USE_UCX_QSORT_R */
+
+void ucx_array_sort(UcxArray* array, cmp_func cmpfnc, void *data) {
+    ucx_array_sort_impl(array->data, array->size, array->elemsize,
+            cmpfnc, data);
+}
+
+void ucx_array_remove(UcxArray *array, size_t index) {
+    array->size--;
+    if (index < array->size) {
+        void* dest = ucx_array_at(array, index);
+        void* src = ucx_array_at(array, index+1);
+        memmove(dest, src, (array->size - index)*array->elemsize);
+    }
+}
+
+void ucx_array_remove_fast(UcxArray *array, size_t index) {
+    array->size--;
+    if (index < array->size) {       
+        void* dest = ucx_array_at(array, index);
+        void* src = ucx_array_at(array, array->size);
+        memcpy(dest, src, array->elemsize);
+    }
+}
+
+int ucx_array_shrink(UcxArray* array) {
+    void* newptr = alrealloc(array->allocator, array->data,
+                array->size*array->elemsize);
+    if (newptr) {
+        array->data = newptr;
+        array->capacity = array->size;
+        return 0;
+    } else {
+        return 1;
+    }
+}
+
+int ucx_array_resize(UcxArray* array, size_t capacity) {
+    if (array->capacity >= capacity) {
+        void* newptr = alrealloc(array->allocator, array->data,
+                capacity*array->elemsize);
+        if (newptr) {
+            array->data = newptr;
+            array->capacity = capacity;
+            if (array->size > array->capacity) {
+                array->size = array->capacity;
+            }
+            return 0;
+        } else {
+            return 1;
+        }
+    } else {
+        return ucx_array_reserve(array, capacity);
+    }
+}
+
+int ucx_array_reserve(UcxArray* array, size_t capacity) {
+    if (array->capacity > capacity) {
+        return 0;
+    } else {
+        void* newptr = alrealloc(array->allocator, array->data,
+                capacity*array->elemsize);
+        if (newptr) {
+            array->data = newptr;
+            array->capacity = capacity;
+            return 0;
+        } else {
+            return 1;
+        }
+    }
+}
+
+int ucx_array_grow(UcxArray* array, size_t count) {
+    return ucx_array_reserve(array, array->size+count);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/avl.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,373 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/avl.h"
+
+#include <limits.h>
+
+#define ptrcast(ptr) ((void*)(ptr))
+#define alloc_tree(al) (UcxAVLTree*) almalloc((al), sizeof(UcxAVLTree))
+#define alloc_node(al) (UcxAVLNode*) almalloc((al), sizeof(UcxAVLNode))
+
+static void ucx_avl_connect(UcxAVLTree *tree,
+        UcxAVLNode *node, UcxAVLNode *child, intptr_t nullkey) {
+    if (child) {
+        child->parent = node;
+    }
+    // if child is NULL, nullkey decides if left or right pointer is cleared
+    if (tree->cmpfunc(
+        ptrcast(child ? child->key : nullkey),
+        ptrcast(node->key), tree->userdata) > 0) {
+      node->right = child;
+    } else {
+      node->left = child;
+    }
+    size_t lh = node->left ? node->left->height : 0;
+    size_t rh = node->right ? node->right->height : 0;
+    node->height = 1 + (lh > rh ? lh : rh);
+}
+
+#define avlheight(node) ((node) ? (node)->height : 0)
+
+static UcxAVLNode* avl_rotright(UcxAVLTree *tree, UcxAVLNode *l0) {
+    UcxAVLNode *p = l0->parent;
+    UcxAVLNode *l1 = l0->left;
+    if (p) {
+        ucx_avl_connect(tree, p, l1, 0);
+    } else {
+        l1->parent = NULL;
+    }
+    ucx_avl_connect(tree, l0, l1->right, l1->key);
+    ucx_avl_connect(tree, l1, l0, 0);
+    return l1;
+}
+
+static UcxAVLNode* avl_rotleft(UcxAVLTree *tree, UcxAVLNode *l0) {
+    UcxAVLNode *p = l0->parent;
+    UcxAVLNode *l1 = l0->right;
+    if (p) {
+        ucx_avl_connect(tree, p, l1, 0);
+    } else {
+        l1->parent = NULL;
+    }
+    ucx_avl_connect(tree, l0, l1->left, l1->key);
+    ucx_avl_connect(tree, l1, l0, 0);
+    return l1;
+}
+
+static void ucx_avl_balance(UcxAVLTree *tree, UcxAVLNode *n) {
+    int lh = avlheight(n->left);
+    int rh = avlheight(n->right);
+    n->height = 1 + (lh > rh ? lh : rh);
+    
+    if (lh - rh == 2) {
+      UcxAVLNode *c = n->left;
+      if (avlheight(c->right) - avlheight(c->left) == 1) {
+        avl_rotleft(tree, c);
+      }
+      n = avl_rotright(tree, n);
+    } else if (rh - lh == 2) {  
+      UcxAVLNode *c = n->right;
+      if (avlheight(c->left) - avlheight(c->right) == 1) {
+        avl_rotright(tree, c);
+      }
+      n = avl_rotleft(tree, n);
+    }
+
+    if (n->parent) {
+      ucx_avl_balance(tree, n->parent);
+    } else {
+      tree->root = n;
+    }
+}
+
+UcxAVLTree *ucx_avl_new(cmp_func cmpfunc) {
+    return ucx_avl_new_a(cmpfunc, ucx_default_allocator());
+}
+
+UcxAVLTree *ucx_avl_new_a(cmp_func cmpfunc, UcxAllocator *allocator) {
+    UcxAVLTree* tree = alloc_tree(allocator);
+    if (tree) {
+        tree->allocator = allocator;
+        tree->cmpfunc = cmpfunc;
+        tree->root = NULL;
+        tree->userdata = NULL;
+    }
+    
+    return tree;
+}
+
+static void ucx_avl_free_node(UcxAllocator *al, UcxAVLNode *node) {
+    if (node) {
+        ucx_avl_free_node(al, node->left);
+        ucx_avl_free_node(al, node->right);
+        alfree(al, node);
+    }
+}
+
+void ucx_avl_free(UcxAVLTree *tree) {
+    UcxAllocator *al = tree->allocator;
+    ucx_avl_free_node(al, tree->root);
+    alfree(al, tree);
+}
+
+static void ucx_avl_free_content_node(UcxAllocator *al, UcxAVLNode *node,
+        ucx_destructor destr) {
+    if (node) {
+        ucx_avl_free_content_node(al, node->left, destr);
+        ucx_avl_free_content_node(al, node->right, destr);
+        if (destr) {
+            destr(node->value);
+        } else {
+            alfree(al, node->value);
+        }
+    }
+}
+
+void ucx_avl_free_content(UcxAVLTree *tree, ucx_destructor destr) {
+    ucx_avl_free_content_node(tree->allocator, tree->root, destr);
+}
+
+UcxAVLNode *ucx_avl_get_node(UcxAVLTree *tree, intptr_t key) {
+    UcxAVLNode *n = tree->root;
+    int cmpresult;
+    while (n && (cmpresult = tree->cmpfunc(
+            ptrcast(key), ptrcast(n->key), tree->userdata))) {
+        n = cmpresult > 0 ? n->right : n->left;
+    }
+    return n;
+}
+
+void *ucx_avl_get(UcxAVLTree *tree, intptr_t key) {
+    UcxAVLNode *n = ucx_avl_get_node(tree, key);
+    return n ? n->value : NULL;
+}
+
+UcxAVLNode *ucx_avl_find_node(UcxAVLTree *tree, intptr_t key,
+        distance_func dfnc, int mode) {
+    UcxAVLNode *n = tree->root;
+    UcxAVLNode *closest = NULL;
+
+    intmax_t cmpresult;
+    intmax_t closest_dist;
+    closest_dist = mode == UCX_AVL_FIND_LOWER_BOUNDED ? INTMAX_MIN : INTMAX_MAX;
+    
+    while (n && (cmpresult = dfnc(
+            ptrcast(key), ptrcast(n->key), tree->userdata))) {
+        if (mode == UCX_AVL_FIND_CLOSEST) {
+            intmax_t dist = cmpresult;
+            if (dist < 0) dist *= -1;
+            if (dist < closest_dist) {
+                closest_dist = dist;
+                closest = n;
+            }
+        } else if (mode == UCX_AVL_FIND_LOWER_BOUNDED && cmpresult <= 0) {
+            if (cmpresult > closest_dist) {
+                closest_dist = cmpresult;
+                closest = n;
+            }
+        } else if (mode == UCX_AVL_FIND_UPPER_BOUNDED && cmpresult >= 0) {
+            if (cmpresult < closest_dist) {
+                closest_dist = cmpresult;
+                closest = n;
+            }
+        }
+        n = cmpresult > 0 ? n->right : n->left;
+    }
+    return n ? n : closest;
+}
+
+void *ucx_avl_find(UcxAVLTree *tree, intptr_t key,
+        distance_func dfnc, int mode) {
+    UcxAVLNode *n = ucx_avl_find_node(tree, key, dfnc, mode);
+    return n ? n->value : NULL;
+}
+
+int ucx_avl_put(UcxAVLTree *tree, intptr_t key, void *value) {
+    return ucx_avl_put_s(tree, key, value, NULL);
+}
+
+int ucx_avl_put_s(UcxAVLTree *tree, intptr_t key, void *value,
+        void **oldvalue) {
+    if (tree->root) {
+        UcxAVLNode *n = tree->root;
+        int cmpresult;
+        while ((cmpresult = tree->cmpfunc(
+                ptrcast(key), ptrcast(n->key), tree->userdata))) {
+            UcxAVLNode *m = cmpresult > 0 ? n->right : n->left;
+            if (m) {
+                n = m;
+            } else {
+                break;
+            }
+        }
+
+        if (cmpresult) {
+            UcxAVLNode* e = alloc_node(tree->allocator);
+            if (e) {
+                e->key = key; e->value = value; e->height = 1;
+                e->parent = e->left = e->right = NULL;
+                ucx_avl_connect(tree, n, e, 0);
+                ucx_avl_balance(tree, n);
+                return 0;
+            } else {
+                return 1;
+            }
+        } else {
+            if (oldvalue) {
+                *oldvalue = n->value;
+            }
+            n->value = value;
+            return 0;
+        }
+    } else {
+        tree->root = alloc_node(tree->allocator);
+        if (tree->root) {
+            tree->root->key = key; tree->root->value = value;
+            tree->root->height = 1;
+            tree->root->parent = tree->root->left = tree->root->right = NULL;
+            
+            if (oldvalue) {
+                *oldvalue = NULL;
+            }
+            
+            return 0;
+        } else {
+            return 1;
+        }
+    }
+}
+
+int ucx_avl_remove(UcxAVLTree *tree, intptr_t key) {
+    return ucx_avl_remove_s(tree, key, NULL, NULL);
+}
+    
+int ucx_avl_remove_node(UcxAVLTree *tree, UcxAVLNode *node) {
+    return ucx_avl_remove_s(tree, node->key, NULL, NULL);
+}
+
+int ucx_avl_remove_s(UcxAVLTree *tree, intptr_t key,
+        intptr_t *oldkey, void **oldvalue) {
+    
+    UcxAVLNode *n = tree->root;
+    int cmpresult;
+    while (n && (cmpresult = tree->cmpfunc(
+            ptrcast(key), ptrcast(n->key), tree->userdata))) {
+        n = cmpresult > 0 ? n->right : n->left;
+    }
+    if (n) {
+        if (oldkey) {
+            *oldkey = n->key;
+        }
+        if (oldvalue) {
+            *oldvalue = n->value;
+        }
+        
+        UcxAVLNode *p = n->parent;
+        if (n->left && n->right) {
+            UcxAVLNode *s = n->right;
+            while (s->left) {
+                s = s->left;
+            }
+            ucx_avl_connect(tree, s->parent, s->right, s->key);
+            n->key = s->key; n->value = s->value;
+            p = s->parent;
+            alfree(tree->allocator, s);
+        } else {
+            if (p) {
+                ucx_avl_connect(tree, p, n->right ? n->right:n->left, n->key);
+            } else {
+                tree->root = n->right ? n->right : n->left;
+                if (tree->root) {
+                    tree->root->parent = NULL;
+                }
+            }
+            alfree(tree->allocator, n);
+        }
+
+        if (p) {
+            ucx_avl_balance(tree, p);
+        }
+        
+        return 0;
+    } else {
+        return 1;
+    }
+}
+
+static size_t ucx_avl_countn(UcxAVLNode *node) {
+    if (node) {
+        return 1 + ucx_avl_countn(node->left) + ucx_avl_countn(node->right);
+    } else {
+        return 0;
+    }
+}
+
+size_t ucx_avl_count(UcxAVLTree *tree) {
+    return ucx_avl_countn(tree->root);
+}
+
+UcxAVLNode* ucx_avl_pred(UcxAVLNode* node) {
+    if (node->left) {
+        UcxAVLNode* n = node->left;
+        while (n->right) {
+            n = n->right;
+        }
+        return n;
+    } else {
+        UcxAVLNode* n = node;
+        while (n->parent) {
+            if (n->parent->right == n) {
+                return n->parent;
+            } else {
+                n = n->parent;
+            }
+        }
+        return NULL;
+    }
+}
+
+UcxAVLNode* ucx_avl_succ(UcxAVLNode* node) {
+    if (node->right) {
+        UcxAVLNode* n = node->right;
+        while (n->left) {
+            n = n->left;
+        }
+        return n;
+    } else {
+        UcxAVLNode* n = node;
+        while (n->parent) {
+            if (n->parent->left == n) {
+                return n->parent;
+            } else {
+                n = n->parent;
+            }
+        }
+        return NULL;
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/buffer.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,297 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/buffer.h"
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+UcxBuffer *ucx_buffer_new(void *space, size_t capacity, int flags) {
+    UcxBuffer *buffer = (UcxBuffer*) malloc(sizeof(UcxBuffer));
+    if (buffer) {
+        buffer->flags = flags;
+        if (!space) {
+            buffer->space = (char*)malloc(capacity);
+            if (!buffer->space) {
+                free(buffer);
+                return NULL;
+            }
+            memset(buffer->space, 0, capacity);
+            buffer->flags |= UCX_BUFFER_AUTOFREE;
+        } else {
+            buffer->space = (char*)space;
+        }
+        buffer->capacity = capacity;
+        buffer->size = 0;
+
+        buffer->pos = 0;
+    }
+
+    return buffer;
+}
+
+void ucx_buffer_free(UcxBuffer *buffer) {
+    if ((buffer->flags & UCX_BUFFER_AUTOFREE) == UCX_BUFFER_AUTOFREE) {
+        free(buffer->space);
+    }
+    free(buffer);
+}
+
+UcxBuffer* ucx_buffer_extract(
+        UcxBuffer *src, size_t start, size_t length, int flags) {
+    if (src->size == 0 || length == 0 ||
+        ((size_t)-1) - start < length || start+length > src->capacity)
+    {
+        return NULL;
+    }
+
+    UcxBuffer *dst = (UcxBuffer*) malloc(sizeof(UcxBuffer));
+    if (dst) {
+        dst->space = (char*)malloc(length);
+        if (!dst->space) {
+            free(dst);
+            return NULL;
+        }
+        dst->capacity = length;
+        dst->size = length;
+        dst->flags = flags | UCX_BUFFER_AUTOFREE;
+        dst->pos = 0;
+        memcpy(dst->space, src->space+start, length);
+    }
+    return dst;
+}
+
+int ucx_buffer_seek(UcxBuffer *buffer, off_t offset, int whence) {
+    size_t npos;
+    switch (whence) {
+    case SEEK_CUR:
+        npos = buffer->pos;
+        break;
+    case SEEK_END:
+        npos = buffer->size;
+        break;
+    case SEEK_SET:
+        npos = 0;
+        break;
+    default:
+        return -1;
+    }
+
+    size_t opos = npos;
+    npos += offset;
+    
+    if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) {
+        return -1;
+    }
+    
+    if (npos >= buffer->size) {
+        return -1;
+    } else {
+        buffer->pos = npos;
+        return 0;
+    }
+
+}
+
+int ucx_buffer_eof(UcxBuffer *buffer) {
+    return buffer->pos >= buffer->size;
+}
+
+int ucx_buffer_extend(UcxBuffer *buffer, size_t len) {
+    size_t newcap = buffer->capacity;
+    
+    if (buffer->capacity + len < buffer->capacity) {
+        return -1;
+    }
+    
+    while (buffer->capacity + len > newcap) {
+        newcap <<= 1;
+        if (newcap < buffer->capacity) {
+            return -1;
+        }
+    }
+    
+    char *newspace = (char*)realloc(buffer->space, newcap);
+    if (newspace) {
+        memset(newspace+buffer->size, 0, newcap-buffer->size);
+        buffer->space = newspace;
+        buffer->capacity = newcap;
+    } else {
+        return -1;
+    }
+    
+    return 0;
+}
+
+size_t ucx_buffer_write(const void *ptr, size_t size, size_t nitems,
+        UcxBuffer *buffer) {
+    size_t len;
+    if(ucx_szmul(size, nitems, &len)) {
+        return 0;
+    }
+    size_t required = buffer->pos + len;
+    if (buffer->pos > required) {
+        return 0;
+    }
+    
+    if (required > buffer->capacity) {
+        if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
+            if (ucx_buffer_extend(buffer, required - buffer->capacity)) {
+                return 0;
+            }
+        } else {
+            len = buffer->capacity - buffer->pos;
+            if (size > 1) {
+                len -= len%size;
+            }
+        }
+    }
+    
+    if (len == 0) {
+        return len;
+    }
+    
+    memcpy(buffer->space + buffer->pos, ptr, len);
+    buffer->pos += len;
+    if(buffer->pos > buffer->size) {
+        buffer->size = buffer->pos;
+    }
+    
+    return len / size;
+}
+
+size_t ucx_buffer_read(void *ptr, size_t size, size_t nitems,
+        UcxBuffer *buffer) {
+    size_t len;
+    if(ucx_szmul(size, nitems, &len)) {
+        return 0;
+    }
+    if (buffer->pos + len > buffer->size) {
+        len = buffer->size - buffer->pos;
+        if (size > 1) len -= len%size;
+    }
+    
+    if (len <= 0) {
+        return len;
+    }
+    
+    memcpy(ptr, buffer->space + buffer->pos, len);
+    buffer->pos += len;
+    
+    return len / size;
+}
+
+int ucx_buffer_putc(UcxBuffer *buffer, int c) {
+    if(buffer->pos >= buffer->capacity) {
+        if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
+            if(ucx_buffer_extend(buffer, 1)) {
+                return EOF;
+            }
+        } else {
+            return EOF;
+        }
+    }
+    
+    c &= 0xFF;
+    buffer->space[buffer->pos] = (char) c;
+    buffer->pos++;
+    if(buffer->pos > buffer->size) {
+        buffer->size = buffer->pos;
+    }
+    return c;
+}
+
+int ucx_buffer_getc(UcxBuffer *buffer) {
+    if (ucx_buffer_eof(buffer)) {
+        return EOF;
+    } else {
+        int c = ((unsigned char*)buffer->space)[buffer->pos];
+        buffer->pos++;
+        return c;
+    }
+}
+
+size_t ucx_buffer_puts(UcxBuffer *buffer, const char *str) {
+    return ucx_buffer_write((const void*)str, 1, strlen(str), buffer);
+}
+
+int ucx_buffer_shift_left(UcxBuffer* buffer, size_t shift) {
+    if (shift >= buffer->size) {
+        buffer->pos = buffer->size = 0;
+    } else {
+        memmove(buffer->space, buffer->space + shift, buffer->size - shift);
+        buffer->size -= shift;
+        
+        if (buffer->pos >= shift) {
+            buffer->pos -= shift;
+        } else {
+            buffer->pos = 0;
+        }
+    }
+    return 0;
+}
+
+int ucx_buffer_shift_right(UcxBuffer* buffer, size_t shift) {
+    size_t req_capacity = buffer->size + shift;
+    size_t movebytes;
+    
+    // auto extend buffer, if required and enabled
+    if (buffer->capacity < req_capacity) {
+        if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
+            if (ucx_buffer_extend(buffer, req_capacity - buffer->capacity)) {
+                return 1;
+            }
+            movebytes = buffer->size;
+        } else {
+            movebytes = buffer->capacity - shift;
+        }
+    } else {
+        movebytes = buffer->size;
+    }
+    
+    memmove(buffer->space + shift, buffer->space, movebytes);
+    buffer->size = shift+movebytes;
+    
+    buffer->pos += shift;
+    if (buffer->pos > buffer->size) {
+        buffer->pos = buffer->size;
+    }
+    
+    return 0;
+}
+
+int ucx_buffer_shift(UcxBuffer* buffer, off_t shift) {
+    if (shift < 0) {
+        return ucx_buffer_shift_left(buffer, (size_t) (-shift));
+    } else if (shift > 0) {
+        return ucx_buffer_shift_right(buffer, (size_t) shift);
+    } else {
+        return 0;
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/list.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,428 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/list.h"
+
+UcxList *ucx_list_clone(const UcxList *l, copy_func fnc, void *data) {
+    return ucx_list_clone_a(ucx_default_allocator(), l, fnc, data);
+}
+
+UcxList *ucx_list_clone_a(UcxAllocator *alloc, const UcxList *l,
+        copy_func fnc, void *data) {
+    UcxList *ret = NULL;
+    while (l) {
+        if (fnc) {
+            ret = ucx_list_append_a(alloc, ret, fnc(l->data, data));
+        } else {
+            ret = ucx_list_append_a(alloc, ret, l->data);
+        }
+        l = l->next;
+    }
+    return ret;
+}
+
+int ucx_list_equals(const UcxList *l1, const UcxList *l2,
+        cmp_func fnc, void* data) {
+    if (l1 == l2) return 1;
+    
+    while (l1 != NULL && l2 != NULL) {
+        if (fnc == NULL) {
+            if (l1->data != l2->data) return 0;
+        } else {
+            if (fnc(l1->data, l2->data, data) != 0) return 0;
+        }
+        l1 = l1->next;
+        l2 = l2->next;
+    }
+    
+    return (l1 == NULL && l2 == NULL);
+}
+
+void ucx_list_free(UcxList *l) {
+    ucx_list_free_a(ucx_default_allocator(), l);
+}
+
+void ucx_list_free_a(UcxAllocator *alloc, UcxList *l) {
+    UcxList *e = l, *f;
+    while (e != NULL) {
+        f = e;
+        e = e->next;
+        alfree(alloc, f);
+    }
+}
+
+void ucx_list_free_content(UcxList* list, ucx_destructor destr) {
+    if (!destr) destr = free;
+    while (list != NULL) {
+        destr(list->data);
+        list = list->next;
+    }
+}
+
+UcxList *ucx_list_append(UcxList *l, void *data)  {
+    return ucx_list_append_a(ucx_default_allocator(), l, data);
+}
+
+UcxList *ucx_list_append_a(UcxAllocator *alloc, UcxList *l, void *data)  {
+    UcxList *nl = (UcxList*) almalloc(alloc, sizeof(UcxList));
+    if (!nl) {
+        return NULL;
+    }
+    
+    nl->data = data;
+    nl->next = NULL;
+    if (l) {
+        UcxList *t = ucx_list_last(l);
+        t->next = nl;
+        nl->prev = t;
+        return l;
+    } else {
+        nl->prev = NULL;
+        return nl;
+    }
+}
+
+UcxList *ucx_list_prepend(UcxList *l, void *data) {
+    return ucx_list_prepend_a(ucx_default_allocator(), l, data);
+}
+
+UcxList *ucx_list_prepend_a(UcxAllocator *alloc, UcxList *l, void *data) {
+    UcxList *nl = ucx_list_append_a(alloc, NULL, data);
+    if (!nl) {
+        return NULL;
+    }
+    l = ucx_list_first(l);
+    
+    if (l) {
+        nl->next = l;
+        l->prev = nl;
+    }
+    return nl;
+}
+
+UcxList *ucx_list_concat(UcxList *l1, UcxList *l2) {
+    if (l1) {
+        UcxList *last = ucx_list_last(l1);
+        last->next = l2;
+        if (l2) {
+            l2->prev = last;
+        }
+        return l1;
+    } else {
+        return l2;
+    }
+}
+
+UcxList *ucx_list_last(const UcxList *l) {
+    if (l == NULL) return NULL;
+    
+    const UcxList *e = l;
+    while (e->next != NULL) {
+        e = e->next;
+    }
+    return (UcxList*)e;
+}
+
+ssize_t ucx_list_indexof(const UcxList *list, const UcxList *elem) {
+    ssize_t index = 0;
+    while (list) {
+        if (list == elem) {
+            return index;
+        }
+        list = list->next;
+        index++;
+    }
+    return -1;
+}
+
+UcxList *ucx_list_get(const UcxList *l, size_t index) {
+    if (l == NULL) return NULL;
+
+    const UcxList *e = l;
+    while (e->next && index > 0) {
+        e = e->next;
+        index--;
+    }
+    
+    return (UcxList*)(index == 0 ? e : NULL);
+}
+
+ssize_t ucx_list_find(const UcxList *l, void *elem,
+        cmp_func fnc, void *cmpdata) {
+    ssize_t index = 0;
+    UCX_FOREACH(e, l) {
+        if (fnc) {
+            if (fnc(elem, e->data, cmpdata) == 0) {
+                return index;
+            }
+        } else {
+            if (elem == e->data) {
+                return index;
+            }
+        }
+        index++;
+    }
+    return -1;
+}
+
+int ucx_list_contains(const UcxList *l, void *elem,
+        cmp_func fnc, void *cmpdata) {
+    return ucx_list_find(l, elem, fnc, cmpdata) > -1;
+}
+
+size_t ucx_list_size(const UcxList *l) {
+    if (l == NULL) return 0;
+    
+    const UcxList *e = l;
+    size_t s = 1;
+    while (e->next != NULL) {
+        e = e->next;
+        s++;
+    }
+
+    return s;
+}
+
+static UcxList *ucx_list_sort_merge(size_t length,
+        UcxList* ls, UcxList* le, UcxList* re,
+        cmp_func fnc, void* data) {
+
+    UcxList** sorted = (UcxList**) malloc(sizeof(UcxList*)*length);
+    UcxList *rc, *lc;
+
+    lc = ls; rc = le;
+    size_t n = 0;
+    while (lc && lc != le && rc != re) {
+        if (fnc(lc->data, rc->data, data) <= 0) {
+            sorted[n] = lc;
+            lc = lc->next;
+        } else {
+            sorted[n] = rc;
+            rc = rc->next;
+        }
+        n++;
+    }
+    while (lc && lc != le) {
+        sorted[n] = lc;
+        lc = lc->next;
+        n++;
+    }
+    while (rc && rc != re) {
+        sorted[n] = rc;
+        rc = rc->next;
+        n++;
+    }
+
+    // Update pointer
+    sorted[0]->prev = NULL;
+    for (int i = 0 ; i < length-1 ; i++) {
+        sorted[i]->next = sorted[i+1];
+        sorted[i+1]->prev = sorted[i];
+    }
+    sorted[length-1]->next = NULL;
+
+    UcxList *ret = sorted[0];
+    free(sorted);
+    return ret;
+}
+
+UcxList *ucx_list_sort(UcxList *l, cmp_func fnc, void *data) {
+    if (l == NULL) {
+        return NULL;
+    }
+
+    UcxList *lc;
+    size_t ln = 1;
+
+    UcxList *ls = l, *le, *re;
+    
+    // check how many elements are already sorted
+    lc = ls;
+    while (lc->next != NULL && fnc(lc->next->data, lc->data, data) > 0) {
+        lc = lc->next;
+        ln++;
+    }
+    le = lc->next;
+
+    if (le == NULL) {
+        return l; // this list is already sorted :)
+    } else {
+        UcxList *rc;
+        size_t rn = 1;
+        rc = le;
+        // skip already sorted elements
+        while (rc->next != NULL && fnc(rc->next->data, rc->data, data) > 0) {
+            rc = rc->next;
+            rn++;
+        }
+        re = rc->next;
+
+        // {ls,...,le->prev} and {rs,...,re->prev} are sorted - merge them
+        UcxList *sorted = ucx_list_sort_merge(ln+rn,
+                ls, le, re,
+                fnc, data);
+        
+        // Something left? Sort it!
+        size_t remainder_length = ucx_list_size(re);
+        if (remainder_length > 0) {
+            UcxList *remainder = ucx_list_sort(re, fnc, data);
+
+            // merge sorted list with (also sorted) remainder
+            l = ucx_list_sort_merge(ln+rn+remainder_length,
+                    sorted, remainder, NULL, fnc, data);
+        } else {
+            // no remainder - we've got our sorted list
+            l = sorted;
+        }
+
+        return l;
+    }
+}
+
+UcxList *ucx_list_first(const UcxList *l) {
+    if (!l) {
+        return NULL;
+    }
+    
+    const UcxList *e = l;
+    while (e->prev) {
+        e = e->prev;
+    }
+    return (UcxList *)e;
+}
+
+UcxList *ucx_list_remove(UcxList *l, UcxList *e) {
+    return ucx_list_remove_a(ucx_default_allocator(), l, e);
+}
+    
+UcxList *ucx_list_remove_a(UcxAllocator *alloc, UcxList *l, UcxList *e) {
+    if (l == e) {
+        l = e->next;
+    }
+    
+    if (e->next) {
+        e->next->prev = e->prev;
+    }
+    
+    if (e->prev) {
+        e->prev->next = e->next;
+    }
+    
+    alfree(alloc, e);
+    return l;
+}
+
+
+static UcxList* ucx_list_setoperation_a(UcxAllocator *allocator,
+        UcxList const *left, UcxList const *right,
+        cmp_func cmpfnc, void* cmpdata,
+        copy_func cpfnc, void* cpdata,
+        int op) {
+    
+    UcxList *res = NULL;
+    UcxList *cur = NULL;
+    const UcxList *src = left;
+    
+    do {
+        UCX_FOREACH(node, src) {
+            void* elem = node->data;
+            if (
+                (op == 0 && !ucx_list_contains(res, elem, cmpfnc, cmpdata)) ||
+                (op == 1 && ucx_list_contains(right, elem, cmpfnc, cmpdata)) ||
+                (op == 2 && !ucx_list_contains(right, elem, cmpfnc, cmpdata))) {
+                UcxList *nl = almalloc(allocator, sizeof(UcxList));
+                nl->prev = cur;
+                nl->next = NULL;
+                if (cpfnc) {
+                    nl->data = cpfnc(elem, cpdata);
+                } else {
+                    nl->data = elem;
+                }
+                if (cur != NULL)
+                    cur->next = nl;
+                cur = nl;
+                if (res == NULL)
+                    res = cur;
+            }
+        }
+        if (op == 0 && src == left)
+            src = right;
+        else
+            src = NULL;
+    } while (src != NULL);
+    
+    return res;
+}
+
+UcxList* ucx_list_union(UcxList const *left, UcxList const *right,
+        cmp_func cmpfnc, void* cmpdata,
+        copy_func cpfnc, void* cpdata) {
+    return ucx_list_union_a(ucx_default_allocator(),
+            left, right, cmpfnc, cmpdata, cpfnc, cpdata);
+}
+
+UcxList* ucx_list_union_a(UcxAllocator *allocator,
+        UcxList const *left, UcxList const *right,
+        cmp_func cmpfnc, void* cmpdata,
+        copy_func cpfnc, void* cpdata) {
+    
+    return ucx_list_setoperation_a(allocator, left, right,
+            cmpfnc, cmpdata, cpfnc, cpdata, 0);
+}
+
+UcxList* ucx_list_intersection(UcxList const *left, UcxList const *right,
+        cmp_func cmpfnc, void* cmpdata,
+        copy_func cpfnc, void* cpdata) {
+    return ucx_list_intersection_a(ucx_default_allocator(), left, right,
+            cmpfnc, cmpdata, cpfnc, cpdata);
+}
+
+UcxList* ucx_list_intersection_a(UcxAllocator *allocator,
+        UcxList const *left, UcxList const *right,
+        cmp_func cmpfnc, void* cmpdata,
+        copy_func cpfnc, void* cpdata) {
+    
+    return ucx_list_setoperation_a(allocator, left, right,
+            cmpfnc, cmpdata, cpfnc, cpdata, 1);
+}
+
+UcxList* ucx_list_difference(UcxList const *left, UcxList const *right,
+        cmp_func cmpfnc, void* cmpdata,
+        copy_func cpfnc, void* cpdata) {
+    return ucx_list_difference_a(ucx_default_allocator(), left, right,
+            cmpfnc, cmpdata, cpfnc, cpdata);
+}
+
+UcxList* ucx_list_difference_a(UcxAllocator *allocator,
+        UcxList const *left, UcxList const *right,
+        cmp_func cmpfnc, void* cmpdata,
+        copy_func cpfnc, void* cpdata) {
+    
+    return ucx_list_setoperation_a(allocator, left, right,
+            cmpfnc, cmpdata, cpfnc, cpdata, 2);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/logging.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,117 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/logging.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <time.h>
+
+UcxLogger *ucx_logger_new(void *stream, unsigned int level, unsigned int mask) {
+    UcxLogger *logger = (UcxLogger*) malloc(sizeof(UcxLogger));
+    if (logger != NULL) {
+        logger->stream = stream;
+        logger->writer = (write_func)fwrite;
+        logger->dateformat = (char*) "%F %T %z ";
+        logger->level = level;
+        logger->mask = mask;
+        logger->levels = ucx_map_new(8);
+        
+        unsigned int l;
+        l = UCX_LOGGER_ERROR;
+        ucx_map_int_put(logger->levels, l, (void*) "[ERROR]");
+        l = UCX_LOGGER_WARN;
+        ucx_map_int_put(logger->levels, l, (void*) "[WARNING]");
+        l = UCX_LOGGER_INFO;
+        ucx_map_int_put(logger->levels, l, (void*) "[INFO]");
+        l = UCX_LOGGER_DEBUG;
+        ucx_map_int_put(logger->levels, l, (void*) "[DEBUG]");
+        l = UCX_LOGGER_TRACE;
+        ucx_map_int_put(logger->levels, l, (void*) "[TRACE]");
+    }
+
+    return logger;
+}
+
+void ucx_logger_free(UcxLogger *logger) {
+    ucx_map_free(logger->levels);
+    free(logger);
+}
+
+// estimated max. message length (documented)
+#define UCX_LOGGER_MSGMAX 4096
+
+void ucx_logger_logf(UcxLogger *logger, unsigned int level, const char* file,
+        const unsigned int line, const char *format, ...) {
+    if (level <= logger->level) {
+        char msg[UCX_LOGGER_MSGMAX];
+        const char *text;
+        size_t k = 0;
+        size_t n;
+        
+        if ((logger->mask & UCX_LOGGER_LEVEL) > 0) {
+            text = (const char*) ucx_map_int_get(logger->levels, level);
+            if (!text) {
+                text = "[UNKNOWN]";
+            }
+            n = strlen(text);
+            n = n > 256 ? 256 : n;
+            memcpy(msg+k, text, n);
+            k += n;
+            msg[k++] = ' ';
+        }
+        if ((logger->mask & UCX_LOGGER_TIMESTAMP) > 0) {
+            time_t now = time(NULL);
+            k += strftime(msg+k, 128, logger->dateformat, localtime(&now));
+        }
+        if ((logger->mask & UCX_LOGGER_SOURCE) > 0) {
+            char *fpart = strrchr(file, '/');
+            if (fpart) file = fpart+1;
+            fpart = strrchr(file, '\\');
+            if (fpart) file = fpart+1;
+            n = strlen(file);
+            memcpy(msg+k, file, n);
+            k += n;
+            k += sprintf(msg+k, ":%u ", line);
+        }
+        
+        if (k > 0) {
+            msg[k++] = '-'; msg[k++] = ' ';
+        }
+        
+        va_list args;
+        va_start (args, format);
+        k += vsnprintf(msg+k, UCX_LOGGER_MSGMAX-k-1, format, args);
+        va_end (args);        
+        
+        msg[k++] = '\n';
+        
+        logger->writer(msg, 1, k, logger->stream);
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/map.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,402 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/map.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+UcxMap *ucx_map_new(size_t size) {
+    return ucx_map_new_a(NULL, size);
+}
+
+UcxMap *ucx_map_new_a(UcxAllocator *allocator, size_t size) {
+    if(size == 0) {
+        size = 16;
+    }
+       
+    if(!allocator) {
+        allocator = ucx_default_allocator();
+    }
+    
+    UcxMap *map = (UcxMap*)almalloc(allocator, sizeof(UcxMap));
+    if (!map) {
+        return NULL;
+    }
+    
+    map->allocator = allocator;
+    map->map = (UcxMapElement**)alcalloc(
+            allocator, size, sizeof(UcxMapElement*));
+    if(map->map == NULL) {
+        alfree(allocator, map);
+        return NULL;
+    }
+    map->size = size;
+    map->count = 0;
+
+    return map;
+}
+
+static void ucx_map_free_elmlist_contents(UcxMap *map) {
+    for (size_t n = 0 ; n < map->size ; n++) {
+        UcxMapElement *elem = map->map[n];
+        if (elem != NULL) {
+            do {
+                UcxMapElement *next = elem->next;
+                alfree(map->allocator, elem->key.data);
+                alfree(map->allocator, elem);
+                elem = next;
+            } while (elem != NULL);
+        }
+    }
+}
+
+void ucx_map_free(UcxMap *map) {
+    ucx_map_free_elmlist_contents(map);
+    alfree(map->allocator, map->map);
+    alfree(map->allocator, map);
+}
+
+void ucx_map_free_content(UcxMap *map, ucx_destructor destr) {
+    UcxMapIterator iter = ucx_map_iterator(map);
+    void *val;
+    UCX_MAP_FOREACH(key, val, iter) {
+        if (destr) {
+            destr(val);
+        } else {
+            alfree(map->allocator, val);
+        }
+    }
+}
+
+void ucx_map_clear(UcxMap *map) {
+    if (map->count == 0) {
+        return; // nothing to do
+    }
+    ucx_map_free_elmlist_contents(map);
+    memset(map->map, 0, map->size*sizeof(UcxMapElement*));
+    map->count = 0;
+}
+
+int ucx_map_copy(UcxMap const *from, UcxMap *to, copy_func fnc, void *data) {
+    UcxMapIterator i = ucx_map_iterator(from);
+    void *value;
+    UCX_MAP_FOREACH(key, value, i) {
+        if (ucx_map_put(to, key, fnc ? fnc(value, data) : value)) {
+            return 1;
+        }
+    }
+    return 0;
+}
+
+UcxMap *ucx_map_clone(UcxMap const *map, copy_func fnc, void *data) {
+    return ucx_map_clone_a(ucx_default_allocator(), map, fnc, data);
+}
+
+UcxMap *ucx_map_clone_a(UcxAllocator *allocator,
+        UcxMap const *map, copy_func fnc, void *data) {
+    size_t bs = (map->count * 5) >> 1;
+    UcxMap *newmap = ucx_map_new_a(allocator, bs > map->size ? bs : map->size);
+    if (!newmap) {
+        return NULL;
+    }
+    ucx_map_copy(map, newmap, fnc, data);
+    return newmap;
+}
+
+int ucx_map_rehash(UcxMap *map) {
+    size_t load = (map->size * 3) >> 2;
+    if (map->count > load) {
+        UcxMap oldmap;
+        oldmap.map = map->map;
+        oldmap.size = map->size;
+        oldmap.count = map->count;
+        oldmap.allocator = map->allocator;
+        
+        map->size = (map->count * 5) >> 1;
+        map->map = (UcxMapElement**)alcalloc(
+                map->allocator, map->size, sizeof(UcxMapElement*));
+        if (!map->map) {
+            *map = oldmap;
+            return 1;
+        }
+        map->count = 0;
+        ucx_map_copy(&oldmap, map, NULL, NULL);
+        
+        /* free the UcxMapElement list of oldmap */
+        ucx_map_free_elmlist_contents(&oldmap);
+        alfree(map->allocator, oldmap.map);
+    }
+    return 0;
+}
+
+int ucx_map_put(UcxMap *map, UcxKey key, void *data) {
+    UcxAllocator *allocator = map->allocator;
+    
+    if (key.hash == 0) {
+        key.hash = ucx_hash((const char*)key.data, key.len);
+    }
+    
+    struct UcxMapKey mapkey;
+    mapkey.hash = key.hash;
+
+    size_t slot = mapkey.hash%map->size;
+    UcxMapElement *elm = map->map[slot];
+    UcxMapElement *prev = NULL;
+
+    while (elm && elm->key.hash < mapkey.hash) {
+        prev = elm;
+        elm = elm->next;
+    }
+    
+    if (!elm || elm->key.hash != mapkey.hash) {
+        UcxMapElement *e = (UcxMapElement*)almalloc(
+                allocator, sizeof(UcxMapElement));
+        if (!e) {
+            return -1;
+        }
+        e->key.data = NULL;
+        if (prev) {
+            prev->next = e;
+        } else {
+            map->map[slot] = e;
+        }
+        e->next = elm;
+        elm = e;
+    }
+    
+    if (!elm->key.data) {
+        void *kd = almalloc(allocator, key.len);
+        if (!kd) {
+            return -1;
+        }
+        memcpy(kd, key.data, key.len);
+        mapkey.data = kd;
+        mapkey.len = key.len;
+        elm->key = mapkey;
+        map->count++;
+    }
+    elm->data = data;
+
+    return 0;
+}
+
+static void* ucx_map_get_and_remove(UcxMap *map, UcxKey key, int remove) {
+    if(key.hash == 0) {
+        key.hash = ucx_hash((const char*)key.data, key.len);
+    }
+    
+    size_t slot = key.hash%map->size;
+    UcxMapElement *elm = map->map[slot];
+    UcxMapElement *pelm = NULL;
+    while (elm && elm->key.hash <= key.hash) {
+        if(elm->key.hash == key.hash) {
+            int n = (key.len > elm->key.len) ? elm->key.len : key.len;
+            if (memcmp(elm->key.data, key.data, n) == 0) {
+                void *data = elm->data;
+                if (remove) {
+                    if (pelm) {
+                        pelm->next = elm->next;
+                    } else {
+                        map->map[slot] = elm->next;
+                    }
+                    alfree(map->allocator, elm->key.data);
+                    alfree(map->allocator, elm);
+                    map->count--;
+                }
+
+                return data;
+            }
+        }
+        pelm = elm;
+        elm = pelm->next;
+    }
+
+    return NULL;
+}
+
+void *ucx_map_get(UcxMap const *map, UcxKey key) {
+    return ucx_map_get_and_remove((UcxMap *)map, key, 0);
+}
+
+void *ucx_map_remove(UcxMap *map, UcxKey key) {
+    return ucx_map_get_and_remove(map, key, 1);
+}
+
+UcxKey ucx_key(const void *data, size_t len) {
+    UcxKey key;
+    key.data = data;
+    key.len = len;
+    key.hash = ucx_hash((const char*)data, len);
+    return key;
+}
+
+
+int ucx_hash(const char *data, size_t len) {
+    /* murmur hash 2 */
+
+    int m = 0x5bd1e995;
+    int r = 24;
+
+    int h = 25 ^ len;
+
+    int i = 0;
+    while (len >= 4) {
+        int k = data[i + 0] & 0xFF;
+        k |= (data[i + 1] & 0xFF) << 8;
+        k |= (data[i + 2] & 0xFF) << 16;
+        k |= (data[i + 3] & 0xFF) << 24;
+
+        k *= m;
+        k ^= k >> r;
+        k *= m;
+
+        h *= m;
+        h ^= k;
+
+        i += 4;
+        len -= 4;
+    }
+
+    switch (len) {
+        case 3: h ^= (data[i + 2] & 0xFF) << 16;
+        /* no break */
+        case 2: h ^= (data[i + 1] & 0xFF) << 8;
+        /* no break */
+        case 1: h ^= (data[i + 0] & 0xFF); h *= m;
+        /* no break */
+    }
+
+    h ^= h >> 13;
+    h *= m;
+    h ^= h >> 15;
+
+    return h;
+}
+
+UcxMapIterator ucx_map_iterator(UcxMap const *map) {
+    UcxMapIterator i;
+    i.map = map;
+    i.cur = NULL;
+    i.index = 0;
+    return i;
+}
+
+int ucx_map_iter_next(UcxMapIterator *i, UcxKey *key, void **elm) {
+    UcxMapElement *e = i->cur;
+    
+    if (e) {
+        e = e->next;
+    } else {
+        e = i->map->map[0];
+    }
+    
+    while (i->index < i->map->size) {
+        if (e) {
+            if (e->data) {
+                i->cur = e;
+                *elm = e->data;
+                key->data = e->key.data;
+                key->hash = e->key.hash;
+                key->len = e->key.len;
+                return 1;
+            }
+
+            e = e->next;
+        } else {
+            i->index++;
+            
+            if (i->index < i->map->size) {
+                e = i->map->map[i->index];
+            }
+        }
+    }
+    
+    return 0;
+}
+
+UcxMap* ucx_map_union(const UcxMap *first, const UcxMap *second,
+                      copy_func cpfnc, void* cpdata) {
+    return ucx_map_union_a(ucx_default_allocator(),
+            first, second, cpfnc, cpdata);
+}
+
+UcxMap* ucx_map_union_a(UcxAllocator *allocator,
+                        const UcxMap *first, const UcxMap *second,
+                        copy_func cpfnc, void* cpdata) {
+    UcxMap* result = ucx_map_clone_a(allocator, first, cpfnc, cpdata);
+    ucx_map_copy(second, result, cpfnc, cpdata);
+    return result;
+}
+
+UcxMap* ucx_map_intersection(const UcxMap *first, const UcxMap *second,
+                             copy_func cpfnc, void* cpdata) {
+    return ucx_map_intersection_a(ucx_default_allocator(),
+            first, second, cpfnc, cpdata);
+}
+
+UcxMap* ucx_map_intersection_a(UcxAllocator *allocator,
+                               const UcxMap *first, const UcxMap *second,
+                               copy_func cpfnc, void* cpdata) {
+    UcxMap *result = ucx_map_new_a(allocator, first->size < second->size ?
+            first->size : second->size);
+
+    UcxMapIterator iter = ucx_map_iterator(first);
+    void* value;
+    UCX_MAP_FOREACH(key, value, iter) {
+        if (ucx_map_get(second, key)) {
+            ucx_map_put(result, key, cpfnc ? cpfnc(value, cpdata) : value);
+        }
+    }
+
+    return result;
+}
+
+UcxMap* ucx_map_difference(const UcxMap *first, const UcxMap *second,
+                           copy_func cpfnc, void* cpdata) {
+    return ucx_map_difference_a(ucx_default_allocator(),
+            first, second, cpfnc, cpdata);
+}
+
+UcxMap* ucx_map_difference_a(UcxAllocator *allocator,
+                             const UcxMap *first, const UcxMap *second,
+                             copy_func cpfnc, void* cpdata) {
+
+    UcxMap *result = ucx_map_new_a(allocator, first->size - second->count);
+
+    UcxMapIterator iter = ucx_map_iterator(first);
+    void* value;
+    UCX_MAP_FOREACH(key, value, iter) {
+        if (!ucx_map_get(second, key)) {
+            ucx_map_put(result, key, cpfnc ? cpfnc(value, cpdata) : value);
+        }
+    }
+
+    ucx_map_rehash(result);
+    return result;
+}
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/mempool.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,237 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/mempool.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#ifdef __cplusplus
+#define __STDC_FORMAT_MACROS
+#endif
+#include <inttypes.h>
+
+/** Capsule for destructible memory chunks. */
+typedef struct {
+    /** The destructor for the memory chunk. */
+    ucx_destructor destructor;
+    /**
+     * First byte of the memory chunk.
+     * Note, that the address <code>&amp;c</code> is also the address
+     * of the whole memory chunk.
+     */
+    char c;
+} ucx_memchunk;
+
+/** Capsule for data and its destructor. */
+typedef struct {
+    /** The destructor for the data. */
+    ucx_destructor destructor;
+    /** A pointer to the data. */
+    void           *ptr;
+} ucx_regdestr;
+
+#ifdef __cplusplus
+extern "C"
+#endif
+void ucx_mempool_shared_destr(void* ptr) {
+    ucx_regdestr *rd = (ucx_regdestr*)ptr;
+    rd->destructor(rd->ptr);
+}
+
+UcxMempool *ucx_mempool_new(size_t n) {
+    size_t poolsz;
+    if(ucx_szmul(n, sizeof(void*), &poolsz)) {
+        return NULL;
+    }
+    
+    UcxMempool *pool = (UcxMempool*)malloc(sizeof(UcxMempool));
+    if (!pool) {
+        return NULL;
+    }
+    
+    pool->data = (void**) malloc(poolsz);
+    if (pool->data == NULL) {
+        free(pool);
+        return NULL;
+    }
+    
+    pool->ndata = 0;
+    pool->size = n;
+    
+    UcxAllocator *allocator = (UcxAllocator*)malloc(sizeof(UcxAllocator));
+    if(!allocator) {
+        free(pool->data);
+        free(pool);
+        return NULL;
+    }
+    allocator->malloc = (ucx_allocator_malloc)ucx_mempool_malloc;
+    allocator->calloc = (ucx_allocator_calloc)ucx_mempool_calloc;
+    allocator->realloc = (ucx_allocator_realloc)ucx_mempool_realloc;
+    allocator->free = (ucx_allocator_free)ucx_mempool_free;
+    allocator->pool = pool;
+    pool->allocator = allocator;
+    
+    return pool;
+}
+
+int ucx_mempool_chcap(UcxMempool *pool, size_t newcap) {
+    if (newcap < pool->ndata) {
+        return 1;
+    }
+    
+    size_t newcapsz;
+    if(ucx_szmul(newcap, sizeof(void*), &newcapsz)) {
+        return 1;
+    }
+    
+    void **data = (void**) realloc(pool->data, newcapsz);
+    if (data) {
+        pool->data = data; 
+        pool->size = newcap;
+        return 0;
+    } else {
+        return 1;
+    }
+}
+
+void *ucx_mempool_malloc(UcxMempool *pool, size_t n) {
+    if(((size_t)-1) - sizeof(ucx_destructor) < n) {
+        return NULL;
+    }
+    
+    if (pool->ndata >= pool->size) {
+        size_t newcap = pool->size*2;
+        if (newcap < pool->size || ucx_mempool_chcap(pool, newcap)) {
+            return NULL;
+        }
+    }
+
+    void *p = malloc(sizeof(ucx_destructor) + n);
+    ucx_memchunk *mem = (ucx_memchunk*)p;
+    if (!mem) {
+        return NULL;
+    }
+
+    mem->destructor = NULL;
+    pool->data[pool->ndata] = mem;
+    pool->ndata++;
+
+    return &(mem->c);
+}
+
+void *ucx_mempool_calloc(UcxMempool *pool, size_t nelem, size_t elsize) {
+    size_t msz;
+    if(ucx_szmul(nelem, elsize, &msz)) {
+        return NULL;
+    }
+    
+    void *ptr = ucx_mempool_malloc(pool, msz);
+    if (!ptr) {
+        return NULL;
+    }
+    memset(ptr, 0, nelem * elsize);
+    return ptr;
+}
+
+void *ucx_mempool_realloc(UcxMempool *pool, void *ptr, size_t n) {
+    if(((size_t)-1) - sizeof(ucx_destructor) < n) {
+        return NULL;
+    }
+    
+    char *mem = ((char*)ptr) - sizeof(ucx_destructor);
+    char *newm = (char*) realloc(mem, n + sizeof(ucx_destructor));
+    if (!newm) {
+        return NULL;
+    }
+    if (mem != newm) {
+        for(size_t i=0 ; i < pool->ndata ; i++) {
+            if(pool->data[i] == mem) {
+                pool->data[i] = newm;
+                return newm + sizeof(ucx_destructor);
+            }
+        }
+        fprintf(stderr, "FATAL: 0x%08" PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",
+          (intptr_t)ptr, (intptr_t)pool);
+        abort();
+    } else {
+        return newm + sizeof(ucx_destructor);
+    }
+}
+
+void ucx_mempool_free(UcxMempool *pool, void *ptr) {
+    ucx_memchunk *chunk = (ucx_memchunk*)((char*)ptr-sizeof(ucx_destructor));
+    for(size_t i=0 ; i<pool->ndata ; i++) {
+        if(chunk == pool->data[i]) {
+            if(chunk->destructor != NULL) {
+                chunk->destructor(&(chunk->c));
+            }
+            free(chunk);
+            size_t last_index = pool->ndata - 1;
+            if(i != last_index) {
+                pool->data[i] = pool->data[last_index];
+                pool->data[last_index] = NULL;
+            }
+            pool->ndata--;
+            return;
+        }
+    }
+    fprintf(stderr, "FATAL: 0x%08" PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",
+            (intptr_t)ptr, (intptr_t)pool);
+    abort();
+}
+
+void ucx_mempool_destroy(UcxMempool *pool) {
+    ucx_memchunk *chunk;
+    for(size_t i=0 ; i<pool->ndata ; i++) {
+        chunk = (ucx_memchunk*) pool->data[i];
+        if(chunk) {
+            if(chunk->destructor) {
+                chunk->destructor(&(chunk->c));
+            }
+            free(chunk);
+        }
+    }
+    free(pool->data);
+    free(pool->allocator);
+    free(pool);
+}
+
+void ucx_mempool_set_destr(void *ptr, ucx_destructor func) {
+    *(ucx_destructor*)((char*)ptr-sizeof(ucx_destructor)) = func;
+}
+
+void ucx_mempool_reg_destr(UcxMempool *pool, void *ptr, ucx_destructor destr) {
+    ucx_regdestr *rd = (ucx_regdestr*)ucx_mempool_malloc(
+            pool,
+            sizeof(ucx_regdestr));
+    rd->destructor = destr;
+    rd->ptr = ptr;
+    ucx_mempool_set_destr(rd, ucx_mempool_shared_destr);
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/properties.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,264 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/properties.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+UcxProperties *ucx_properties_new() {
+    UcxProperties *parser = (UcxProperties*)malloc(
+            sizeof(UcxProperties));
+    if(!parser) {
+        return NULL;
+    }
+    
+    parser->buffer = NULL;
+    parser->buflen = 0;
+    parser->pos = 0;
+    parser->tmp = NULL;
+    parser->tmplen = 0;
+    parser->tmpcap = 0;
+    parser->error = 0;
+    parser->delimiter = '=';
+    parser->comment1 = '#';
+    parser->comment2 = 0;
+    parser->comment3 = 0;   
+    
+    return parser;
+}
+
+void ucx_properties_free(UcxProperties *parser) {
+    if(parser->tmp) {
+        free(parser->tmp);
+    }
+    free(parser);
+}
+
+void ucx_properties_fill(UcxProperties *parser, char *buf, size_t len) {
+    parser->buffer = buf;
+    parser->buflen = len;
+    parser->pos = 0;
+}
+
+static void parser_tmp_append(UcxProperties *parser, char *buf, size_t len) {
+    if(parser->tmpcap - parser->tmplen < len) {
+        size_t newcap = parser->tmpcap + len + 64;
+        parser->tmp = (char*)realloc(parser->tmp, newcap);
+        parser->tmpcap = newcap;
+    }
+    memcpy(parser->tmp + parser->tmplen, buf, len);
+    parser->tmplen += len;
+}
+
+int ucx_properties_next(UcxProperties *parser, sstr_t *name, sstr_t *value)  {   
+    if(parser->tmplen > 0) {
+        char *buf = parser->buffer + parser->pos;
+        size_t len = parser->buflen - parser->pos;
+        sstr_t str = sstrn(buf, len);
+        sstr_t nl = sstrchr(str, '\n');
+        if(nl.ptr) {
+            size_t newlen = (size_t)(nl.ptr - buf) + 1;
+            parser_tmp_append(parser, buf, newlen);
+            // the tmp buffer contains exactly one line now
+            
+            char *orig_buf = parser->buffer;
+            size_t orig_len = parser->buflen;
+            
+            parser->buffer = parser->tmp;
+            parser->buflen = parser->tmplen;
+            parser->pos = 0;    
+            parser->tmp = NULL;
+            parser->tmpcap = 0;
+            parser->tmplen = 0;
+            // run ucx_properties_next with the tmp buffer as main buffer
+            int ret = ucx_properties_next(parser, name, value);
+            
+            // restore original buffer
+            parser->tmp = parser->buffer;
+            parser->buffer = orig_buf;
+            parser->buflen = orig_len;
+            parser->pos = newlen;
+            
+            /*
+             * if ret == 0 the tmp buffer contained just space or a comment
+             * we parse again with the original buffer to get a name/value
+             * or a new tmp buffer
+             */
+            return ret ? ret : ucx_properties_next(parser, name, value);
+        } else {
+            parser_tmp_append(parser, buf, len);
+            return 0;
+        }
+    } else if(parser->tmp) {
+        free(parser->tmp);
+        parser->tmp = NULL;
+    }
+    
+    char comment1 = parser->comment1;
+    char comment2 = parser->comment2;
+    char comment3 = parser->comment3;
+    char delimiter = parser->delimiter;
+    
+    // get one line and parse it
+    while(parser->pos < parser->buflen) {
+        char *buf = parser->buffer + parser->pos;
+        size_t len = parser->buflen - parser->pos;
+        
+        /*
+         * First we check if we have at least one line. We also get indices of
+         * delimiter and comment chars
+         */
+        size_t delimiter_index = 0;
+        size_t comment_index = 0;
+        int has_comment = 0;
+
+        size_t i = 0;
+        char c = 0;
+        for(;i<len;i++) {
+            c = buf[i];
+            if(c == comment1 || c == comment2 || c == comment3) {
+                if(comment_index == 0) {
+                    comment_index = i;
+                    has_comment = 1;
+                }
+            } else if(c == delimiter) {
+                if(delimiter_index == 0 && !has_comment) {
+                    delimiter_index = i;
+                }
+            } else if(c == '\n') {
+                break;
+            }
+        }
+
+        if(c != '\n') {
+            // we don't have enough data for a line
+            // store remaining bytes in temporary buffer for next round
+            parser->tmpcap = len + 128;
+            parser->tmp = (char*)malloc(parser->tmpcap);
+            parser->tmplen = len;
+            memcpy(parser->tmp, buf, len);
+            return 0;
+        }
+        
+        sstr_t line = has_comment ? sstrn(buf, comment_index) : sstrn(buf, i);
+        // check line
+        if(delimiter_index == 0) {
+            line = sstrtrim(line);
+            if(line.length != 0) {
+                parser->error = 1;
+            }
+        } else {
+            sstr_t n = sstrn(buf, delimiter_index);
+            sstr_t v = sstrn(
+                    buf + delimiter_index + 1,
+                    line.length - delimiter_index - 1); 
+            n = sstrtrim(n);
+            v = sstrtrim(v);
+            if(n.length != 0 || v.length != 0) {
+                *name = n;
+                *value = v;
+                parser->pos += i + 1;
+                return 1;
+            } else {
+                parser->error = 1;
+            }
+        }
+        
+        parser->pos += i + 1;
+    }
+    
+    return 0;
+}
+
+int ucx_properties2map(UcxProperties *parser, UcxMap *map) {
+    sstr_t name;
+    sstr_t value;
+    while(ucx_properties_next(parser, &name, &value)) {
+        value = sstrdup_a(map->allocator, value);
+        if(!value.ptr) {
+            return 1;
+        }
+        if(ucx_map_sstr_put(map, name, value.ptr)) {
+            alfree(map->allocator, value.ptr);
+            return 1;
+        }
+    }
+    if (parser->error) {
+        return parser->error;
+    } else {
+        return 0;
+    }
+}
+
+// buffer size is documented - change doc, when you change bufsize!
+#define UCX_PROPLOAD_BUFSIZE  1024
+int ucx_properties_load(UcxMap *map, FILE *file) {
+    UcxProperties *parser = ucx_properties_new();
+    if(!(parser && map && file)) {
+        return 1;
+    }
+    
+    int error = 0;
+    size_t r;
+    char buf[UCX_PROPLOAD_BUFSIZE];
+    while((r = fread(buf, 1, UCX_PROPLOAD_BUFSIZE, file)) != 0) {
+        ucx_properties_fill(parser, buf, r);
+        error = ucx_properties2map(parser, map);
+        if (error) {
+            break;
+        }
+    }
+    ucx_properties_free(parser);
+    return error;
+}
+
+int ucx_properties_store(UcxMap *map, FILE *file) {
+    UcxMapIterator iter = ucx_map_iterator(map);
+    void *v;
+    sstr_t value;
+    size_t written;
+
+    UCX_MAP_FOREACH(k, v, iter) {
+        value = sstr((char*)v);
+
+        written = 0;
+        written += fwrite(k.data, 1, k.len, file);
+        written += fwrite(" = ", 1, 3, file);
+        written += fwrite(value.ptr, 1, value.length, file);
+        written += fwrite("\n", 1, 1, file);
+
+        if (written != k.len + value.length + 4) {
+            return 1;
+        }
+    }
+
+    return 0;
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/stack.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,165 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/stack.h"
+
+#include <string.h>
+
+static size_t ucx_stack_align(size_t n) {
+    int align = n % sizeof(void*);
+    if (align) {
+        n += sizeof(void*) - align;
+    }
+    return n;
+}
+
+void ucx_stack_init(UcxStack *stack, char* space, size_t size) {
+    stack->size = size - size % sizeof(void*);
+    stack->space = space;
+    stack->top = NULL;
+    
+    stack->allocator.pool = stack;
+    stack->allocator.malloc = (ucx_allocator_malloc) ucx_stack_malloc;
+    stack->allocator.calloc = (ucx_allocator_calloc) ucx_stack_calloc;
+    stack->allocator.realloc = (ucx_allocator_realloc) ucx_stack_realloc;
+    stack->allocator.free = (ucx_allocator_free) ucx_stack_free;
+}
+
+void *ucx_stack_malloc(UcxStack *stack, size_t n) {
+
+    if (ucx_stack_avail(stack) < ucx_stack_align(n)) {
+        return NULL;
+    } else {
+        char *prev = stack->top;
+        if (stack->top) {
+            stack->top += ucx_stack_align(ucx_stack_topsize(stack));
+        } else {
+            stack->top = stack->space;
+        }
+        
+        ((struct ucx_stack_metadata*)stack->top)->prev = prev;
+        ((struct ucx_stack_metadata*)stack->top)->size = n;
+        stack->top += sizeof(struct ucx_stack_metadata);
+        
+        return stack->top;
+    }
+}
+
+void *ucx_stack_calloc(UcxStack *stack, size_t nelem, size_t elsize) {
+    void *mem = ucx_stack_malloc(stack, nelem*elsize);
+    memset(mem, 0, nelem*elsize);
+    return mem;
+}
+
+void *ucx_stack_realloc(UcxStack *stack, void *ptr, size_t n) {
+    if (ptr == stack->top) {
+        if (stack->size - (stack->top - stack->space) < ucx_stack_align(n)) {
+            return NULL;
+        } else {
+            ((struct ucx_stack_metadata*)stack->top - 1)->size = n;
+            return ptr;
+        }
+    } else {
+        if (ucx_stack_align(((struct ucx_stack_metadata*)ptr - 1)->size) <
+                ucx_stack_align(n)) {
+            void *nptr = ucx_stack_malloc(stack, n);
+            if (nptr) {
+                memcpy(nptr, ptr, n);
+                ucx_stack_free(stack, ptr);
+                
+                return nptr;
+            } else {
+                return NULL;
+            }
+        } else {
+            ((struct ucx_stack_metadata*)ptr - 1)->size = n;
+            return ptr;
+        }
+    }
+}
+
+void ucx_stack_free(UcxStack *stack, void *ptr) {
+    if (ptr == stack->top) {
+        stack->top = ((struct ucx_stack_metadata*) stack->top - 1)->prev;
+    } else {
+        struct ucx_stack_metadata *next = (struct ucx_stack_metadata*)(
+            (char*)ptr +
+            ucx_stack_align(((struct ucx_stack_metadata*) ptr - 1)->size)
+        );
+        next->prev = ((struct ucx_stack_metadata*) ptr - 1)->prev;
+    }
+}
+
+void ucx_stack_popn(UcxStack *stack, void *dest, size_t n) {
+    if (ucx_stack_empty(stack)) {
+        return;
+    }
+    
+    if (dest) {
+        size_t len = ucx_stack_topsize(stack);
+        if (len > n) {
+            len = n;
+        }
+
+        memcpy(dest, stack->top, len);
+    }
+    
+    ucx_stack_free(stack, stack->top);
+}
+
+size_t ucx_stack_avail(UcxStack *stack) {
+    size_t avail = ((stack->top ? (stack->size
+                    - (stack->top - stack->space)
+                    - ucx_stack_align(ucx_stack_topsize(stack)))
+                    : stack->size));
+    
+    if (avail > sizeof(struct ucx_stack_metadata)) {
+        return avail - sizeof(struct ucx_stack_metadata);
+    } else {
+        return 0;
+    }
+}
+
+void *ucx_stack_push(UcxStack *stack, size_t n, const void *data) {
+    void *space = ucx_stack_malloc(stack, n);
+    if (space) {
+        memcpy(space, data, n);
+    }
+    return space;
+}
+
+void *ucx_stack_pusharr(UcxStack *stack,
+        size_t nelem, size_t elsize, const void *data) {
+    
+    // skip the memset by using malloc
+    void *space = ucx_stack_malloc(stack, nelem*elsize);
+    if (space) {
+        memcpy(space, data, nelem*elsize);
+    }
+    return space;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/string.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,807 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/string.h"
+
+#include "ucx/allocator.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <ctype.h>
+
+#ifndef _WIN32
+#include <strings.h> /* for strncasecmp() */
+#endif /* _WIN32 */
+
+sstr_t sstr(char *cstring) {
+    sstr_t string;
+    string.ptr = cstring;
+    string.length = strlen(cstring);
+    return string;
+}
+
+sstr_t sstrn(char *cstring, size_t length) {
+    sstr_t string;
+    string.ptr = cstring;
+    string.length = length;
+    return string;
+}
+
+scstr_t scstr(const char *cstring) {
+    scstr_t string;
+    string.ptr = cstring;
+    string.length = strlen(cstring);
+    return string;
+}
+
+scstr_t scstrn(const char *cstring, size_t length) {
+    scstr_t string;
+    string.ptr = cstring;
+    string.length = length;
+    return string;
+}
+
+
+size_t scstrnlen(size_t n, ...) {
+    if (n == 0) return 0;
+    
+    va_list ap;
+    va_start(ap, n);
+    
+    size_t size = 0;
+
+    for (size_t i = 0 ; i < n ; i++) {
+        scstr_t str = va_arg(ap, scstr_t);
+        if(SIZE_MAX - str.length < size) {
+            size = SIZE_MAX;
+            break;
+        }
+        size += str.length;
+    }
+    va_end(ap);
+
+    return size;
+}
+
+static sstr_t sstrvcat_a(
+        UcxAllocator *a,
+        size_t count,
+        scstr_t s1,
+        va_list ap) {
+    sstr_t str;
+    str.ptr = NULL;
+    str.length = 0;
+    if(count < 2) {
+        return str;
+    }
+    
+    scstr_t s2 = va_arg (ap, scstr_t);
+    
+    if(((size_t)-1) - s1.length < s2.length) {
+        return str;
+    }
+    
+    scstr_t *strings = (scstr_t*) calloc(count, sizeof(scstr_t));
+    if(!strings) {
+        return str;
+    }
+    
+    // get all args and overall length
+    strings[0] = s1;
+    strings[1] = s2;
+    size_t slen = s1.length + s2.length;
+    int error = 0;
+    for (size_t i=2;i<count;i++) {
+        scstr_t s = va_arg (ap, scstr_t);
+        strings[i] = s;
+        if(((size_t)-1) - s.length < slen) {
+            error = 1;
+            break;
+        }
+        slen += s.length;
+    }
+    if(error) {
+        free(strings);
+        return str;
+    }
+    
+    // create new string
+    str.ptr = (char*) almalloc(a, slen + 1);
+    str.length = slen;
+    if(!str.ptr) {
+        free(strings);
+        str.length = 0;
+        return str;
+    }
+    
+    // concatenate strings
+    size_t pos = 0;
+    for (size_t i=0;i<count;i++) {
+        scstr_t s = strings[i];
+        memcpy(str.ptr + pos, s.ptr, s.length);
+        pos += s.length;
+    }
+    
+    str.ptr[str.length] = '\0';
+    
+    free(strings);
+    
+    return str;
+}
+
+sstr_t scstrcat(size_t count, scstr_t s1, ...) {
+    va_list ap;
+    va_start(ap, s1);
+    sstr_t s = sstrvcat_a(ucx_default_allocator(), count, s1, ap);
+    va_end(ap);
+    return s;
+}
+
+sstr_t scstrcat_a(UcxAllocator *a, size_t count, scstr_t s1, ...) {
+    va_list ap;
+    va_start(ap, s1);
+    sstr_t s = sstrvcat_a(a, count, s1, ap);
+    va_end(ap);
+    return s;
+}
+
+static int ucx_substring(
+        size_t str_length,
+        size_t start,
+        size_t length,
+        size_t *newlen,
+        size_t *newpos)
+{
+    *newlen = 0;
+    *newpos = 0;
+    
+    if(start > str_length) {
+        return 0;
+    }
+    
+    if(length > str_length - start) {
+        length = str_length - start;
+    }
+    *newlen = length;
+    *newpos = start;
+    return 1;
+}
+
+sstr_t sstrsubs(sstr_t s, size_t start) {
+    return sstrsubsl (s, start, s.length-start);
+}
+
+sstr_t sstrsubsl(sstr_t s, size_t start, size_t length) {
+    size_t pos;
+    sstr_t ret = { NULL, 0 };
+    if(ucx_substring(s.length, start, length, &ret.length, &pos)) {
+        ret.ptr = s.ptr + pos;
+    }
+    return ret;
+}
+
+scstr_t scstrsubs(scstr_t string, size_t start) {
+    return scstrsubsl(string, start, string.length-start);
+}
+
+scstr_t scstrsubsl(scstr_t s, size_t start, size_t length) {
+    size_t pos;
+    scstr_t ret = { NULL, 0 };
+    if(ucx_substring(s.length, start, length, &ret.length, &pos)) {
+        ret.ptr = s.ptr + pos;
+    }
+    return ret;
+}
+
+
+static int ucx_strchr(const char *str, size_t length, int chr, size_t *pos) {
+    for(size_t i=0;i<length;i++) {
+        if(str[i] == chr) {
+            *pos = i;
+            return 1;
+        }
+    }
+    return 0;
+}
+
+static int ucx_strrchr(const char *str, size_t length, int chr, size_t *pos) {
+    if(length > 0) {
+        for(size_t i=length ; i>0 ; i--) {
+            if(str[i-1] == chr) {
+                *pos = i-1;
+                return 1;
+            }
+        }
+    }
+    return 0;
+}
+
+sstr_t sstrchr(sstr_t s, int c) {
+    size_t pos = 0;
+    if(ucx_strchr(s.ptr, s.length, c, &pos)) {
+        return sstrsubs(s, pos);
+    }
+    return sstrn(NULL, 0);
+}
+
+sstr_t sstrrchr(sstr_t s, int c) {
+    size_t pos = 0;
+    if(ucx_strrchr(s.ptr, s.length, c, &pos)) {
+        return sstrsubs(s, pos);
+    }
+    return sstrn(NULL, 0);
+}
+
+scstr_t scstrchr(scstr_t s, int c) {
+    size_t pos = 0;
+    if(ucx_strchr(s.ptr, s.length, c, &pos)) {
+        return scstrsubs(s, pos);
+    }
+    return scstrn(NULL, 0);
+}
+
+scstr_t scstrrchr(scstr_t s, int c) {
+    size_t pos = 0;
+    if(ucx_strrchr(s.ptr, s.length, c, &pos)) {
+        return scstrsubs(s, pos);
+    }
+    return scstrn(NULL, 0);
+}
+
+#define ptable_r(dest, useheap, ptable, index) (dest = useheap ? \
+    ((size_t*)ptable)[index] : (size_t) ((uint8_t*)ptable)[index])
+
+#define ptable_w(useheap, ptable, index, src) do {\
+    if (!useheap) ((uint8_t*)ptable)[index] = (uint8_t) src;\
+    else ((size_t*)ptable)[index] = src;\
+    } while (0);
+
+
+static const char* ucx_strstr(
+        const char *str,
+        size_t length,
+        const char *match,
+        size_t matchlen,
+        size_t *newlen)
+{
+    *newlen = length;
+    if (matchlen == 0) {
+        return str;
+    }
+    
+    const char *result = NULL;
+    size_t resultlen = 0;
+    
+    /*
+     * IMPORTANT:
+     * our prefix table contains the prefix length PLUS ONE
+     * this is our decision, because we want to use the full range of size_t
+     * the original algorithm needs a (-1) at one single place
+     * and we want to avoid that
+     */
+    
+    /* static prefix table */
+    static uint8_t s_prefix_table[256];
+    
+    /* check pattern length and use appropriate prefix table */
+    /* if the pattern exceeds static prefix table, allocate on the heap */
+    register int useheap = matchlen > 255;
+    register void* ptable = useheap ?
+        calloc(matchlen+1, sizeof(size_t)): s_prefix_table;
+    
+    /* keep counter in registers */
+    register size_t i, j;
+    
+    /* fill prefix table */
+    i = 0; j = 0;
+    ptable_w(useheap, ptable, i, j);
+    while (i < matchlen) {
+        while (j >= 1 && match[j-1] != match[i]) {
+            ptable_r(j, useheap, ptable, j-1);
+        }
+        i++; j++;
+        ptable_w(useheap, ptable, i, j);
+    }
+
+    /* search */
+    i = 0; j = 1;
+    while (i < length) {
+        while (j >= 1 && str[i] != match[j-1]) {
+            ptable_r(j, useheap, ptable, j-1);
+        }
+        i++; j++;
+        if (j-1 == matchlen) {
+            size_t start = i - matchlen;
+            result = str + start;
+            resultlen = length - start;
+            break;
+        }
+    }
+
+    /* if prefix table was allocated on the heap, free it */
+    if (ptable != s_prefix_table) {
+        free(ptable);
+    }
+    
+    *newlen = resultlen;
+    return result;
+}
+
+sstr_t scstrsstr(sstr_t string, scstr_t match) {
+    sstr_t result;
+    
+    size_t reslen;
+    const char *resstr = ucx_strstr(string.ptr, string.length, match.ptr, match.length, &reslen);
+    if(!resstr) {
+        result.ptr = NULL;
+        result.length = 0;
+        return result;
+    }
+    
+    size_t pos = resstr - string.ptr;
+    result.ptr = string.ptr + pos;
+    result.length = reslen;
+    
+    return result;
+}
+
+scstr_t scstrscstr(scstr_t string, scstr_t match) {
+    scstr_t result;
+    
+    size_t reslen;
+    const char *resstr = ucx_strstr(string.ptr, string.length, match.ptr, match.length, &reslen);
+    if(!resstr) {
+        result.ptr = NULL;
+        result.length = 0;
+        return result;
+    }
+    
+    size_t pos = resstr - string.ptr;
+    result.ptr = string.ptr + pos;
+    result.length = reslen;
+    
+    return result;
+}
+
+#undef ptable_r
+#undef ptable_w
+
+sstr_t* scstrsplit(scstr_t s, scstr_t d, ssize_t *n) {
+    return scstrsplit_a(ucx_default_allocator(), s, d, n);
+}
+
+sstr_t* scstrsplit_a(UcxAllocator *allocator, scstr_t s, scstr_t d, ssize_t *n) {
+    if (s.length == 0 || d.length == 0) {
+        *n = -1;
+        return NULL;
+    }
+    
+    /* special cases: delimiter is at least as large as the string */
+    if (d.length >= s.length) {
+        /* exact match */
+        if (sstrcmp(s, d) == 0) {
+            *n = 0;
+            return NULL;
+        } else /* no match possible */ {
+            *n = 1;
+            sstr_t *result = (sstr_t*) almalloc(allocator, sizeof(sstr_t));
+            if(result) {
+                *result = sstrdup_a(allocator, s);
+            } else {
+                *n = -2;
+            }
+            return result;
+        }
+    }
+    
+    ssize_t nmax = *n;
+    size_t arrlen = 16;
+    sstr_t* result = (sstr_t*) alcalloc(allocator, arrlen, sizeof(sstr_t));
+
+    if (result) {
+        scstr_t curpos = s;
+        ssize_t j = 1;
+        while (1) {
+            scstr_t match;
+            /* optimize for one byte delimiters */
+            if (d.length == 1) {
+                match = curpos;
+                for (size_t i = 0 ; i < curpos.length ; i++) {
+                    if (curpos.ptr[i] == *(d.ptr)) {
+                        match.ptr = curpos.ptr + i;
+                        break;
+                    }
+                    match.length--;
+                }
+            } else {
+                match = scstrscstr(curpos, d);
+            }
+            if (match.length > 0) {
+                /* is this our last try? */
+                if (nmax == 0 || j < nmax) {
+                    /* copy the current string to the array */
+                    scstr_t item = scstrn(curpos.ptr, match.ptr - curpos.ptr);
+                    result[j-1] = sstrdup_a(allocator, item);
+                    size_t processed = item.length + d.length;
+                    curpos.ptr += processed;
+                    curpos.length -= processed;
+
+                    /* allocate memory for the next string */
+                    j++;
+                    if (j > arrlen) {
+                        arrlen *= 2;
+                        size_t reallocsz;
+                        sstr_t* reallocated = NULL;
+                        if(!ucx_szmul(arrlen, sizeof(sstr_t), &reallocsz)) {
+                            reallocated = (sstr_t*) alrealloc(
+                                    allocator, result, reallocsz);
+                        }
+                        if (reallocated) {
+                            result = reallocated;
+                        } else {
+                            for (ssize_t i = 0 ; i < j-1 ; i++) {
+                                alfree(allocator, result[i].ptr);
+                            }
+                            alfree(allocator, result);
+                            *n = -2;
+                            return NULL;
+                        }
+                    }
+                } else {
+                    /* nmax reached, copy the _full_ remaining string */
+                    result[j-1] = sstrdup_a(allocator, curpos);
+                    break;
+                }
+            } else {
+                /* no more matches, copy last string */
+                result[j-1] = sstrdup_a(allocator, curpos);
+                break;
+            }
+        }
+        *n = j;
+    } else {
+        *n = -2;
+    }
+
+    return result;
+}
+
+int scstrcmp(scstr_t s1, scstr_t s2) {
+    if (s1.length == s2.length) {
+        return memcmp(s1.ptr, s2.ptr, s1.length);
+    } else if (s1.length > s2.length) {
+        return 1;
+    } else {
+        return -1;
+    }
+}
+
+int scstrcasecmp(scstr_t s1, scstr_t s2) {
+    if (s1.length == s2.length) {
+#ifdef _WIN32
+        return _strnicmp(s1.ptr, s2.ptr, s1.length);
+#else
+        return strncasecmp(s1.ptr, s2.ptr, s1.length);
+#endif
+    } else if (s1.length > s2.length) {
+        return 1;
+    } else {
+        return -1;
+    }
+}
+
+sstr_t scstrdup(scstr_t s) {
+    return sstrdup_a(ucx_default_allocator(), s);
+}
+
+sstr_t scstrdup_a(UcxAllocator *allocator, scstr_t s) {
+    sstr_t newstring;
+    newstring.ptr = (char*)almalloc(allocator, s.length + 1);
+    if (newstring.ptr) {
+        newstring.length = s.length;
+        newstring.ptr[newstring.length] = 0;
+        
+        memcpy(newstring.ptr, s.ptr, s.length);
+    } else {
+        newstring.length = 0;
+    }
+    
+    return newstring;
+}
+
+
+static size_t ucx_strtrim(const char *s, size_t len, size_t *newlen) {
+    const char *newptr = s;
+    size_t length = len;
+    
+    while(length > 0 && isspace(*newptr)) {
+        newptr++;
+        length--;
+    }
+    while(length > 0 && isspace(newptr[length-1])) {
+        length--;
+    }
+    
+    *newlen = length;
+    return newptr - s;
+}
+
+sstr_t sstrtrim(sstr_t string) {
+    sstr_t newstr;
+    newstr.ptr = string.ptr
+                 + ucx_strtrim(string.ptr, string.length, &newstr.length);
+    return newstr;
+}
+
+scstr_t scstrtrim(scstr_t string) {
+    scstr_t newstr;
+    newstr.ptr = string.ptr
+                 + ucx_strtrim(string.ptr, string.length, &newstr.length);
+    return newstr;
+}
+
+int scstrprefix(scstr_t string, scstr_t prefix) {
+    if (string.length == 0) {
+        return prefix.length == 0;
+    }
+    if (prefix.length == 0) {
+        return 1;
+    }
+    
+    if (prefix.length > string.length) {
+        return 0;
+    } else {
+        return memcmp(string.ptr, prefix.ptr, prefix.length) == 0;
+    }
+}
+
+int scstrsuffix(scstr_t string, scstr_t suffix) {
+    if (string.length == 0) {
+        return suffix.length == 0;
+    }
+    if (suffix.length == 0) {
+        return 1;
+    }
+    
+    if (suffix.length > string.length) {
+        return 0;
+    } else {
+        return memcmp(string.ptr+string.length-suffix.length,
+            suffix.ptr, suffix.length) == 0;
+    }
+}
+
+int scstrcaseprefix(scstr_t string, scstr_t prefix) {
+    if (string.length == 0) {
+        return prefix.length == 0;
+    }
+    if (prefix.length == 0) {
+        return 1;
+    }
+    
+    if (prefix.length > string.length) {
+        return 0;
+    } else {
+        scstr_t subs = scstrsubsl(string, 0, prefix.length);
+        return scstrcasecmp(subs, prefix) == 0;
+    }
+}
+
+int scstrcasesuffix(scstr_t string, scstr_t suffix) {
+    if (string.length == 0) {
+        return suffix.length == 0;
+    }
+    if (suffix.length == 0) {
+        return 1;
+    }
+    
+    if (suffix.length > string.length) {
+        return 0;
+    } else {
+        scstr_t subs = scstrsubs(string, string.length-suffix.length);
+        return scstrcasecmp(subs, suffix) == 0;
+    }
+}
+
+sstr_t scstrlower(scstr_t string) {
+    sstr_t ret = sstrdup(string);
+    for (size_t i = 0; i < ret.length ; i++) {
+        ret.ptr[i] = tolower(ret.ptr[i]);
+    }
+    return ret;
+}
+
+sstr_t scstrlower_a(UcxAllocator *allocator, scstr_t string) {
+    sstr_t ret = sstrdup_a(allocator, string);
+    for (size_t i = 0; i < ret.length ; i++) {
+        ret.ptr[i] = tolower(ret.ptr[i]);
+    }
+    return ret;
+}
+
+sstr_t scstrupper(scstr_t string) {
+    sstr_t ret = sstrdup(string);
+    for (size_t i = 0; i < ret.length ; i++) {
+        ret.ptr[i] = toupper(ret.ptr[i]);
+    }
+    return ret;
+}
+
+sstr_t scstrupper_a(UcxAllocator *allocator, scstr_t string) {
+    sstr_t ret = sstrdup_a(allocator, string);
+    for (size_t i = 0; i < ret.length ; i++) {
+        ret.ptr[i] = toupper(ret.ptr[i]);
+    }
+    return ret;
+}
+
+#define REPLACE_INDEX_BUFFER_MAX 100
+
+struct scstrreplace_ibuf {
+    size_t* buf;
+    unsigned int len; /* small indices */
+    struct scstrreplace_ibuf* next;
+};
+
+static void scstrrepl_free_ibuf(struct scstrreplace_ibuf *buf) {
+    while (buf) {
+        struct scstrreplace_ibuf *next = buf->next;
+        free(buf->buf);
+        free(buf);
+        buf = next;
+    }
+}
+
+sstr_t scstrreplacen_a(UcxAllocator *allocator, scstr_t str,
+                     scstr_t pattern, scstr_t replacement, size_t replmax) {
+
+    if (pattern.length == 0 || pattern.length > str.length || replmax == 0)
+        return sstrdup(str);
+
+    /* Compute expected buffer length */
+    size_t ibufmax = str.length / pattern.length;
+    size_t ibuflen = replmax < ibufmax ? replmax : ibufmax;
+    if (ibuflen > REPLACE_INDEX_BUFFER_MAX) {
+        ibuflen = REPLACE_INDEX_BUFFER_MAX;
+    }
+
+    /* Allocate first index buffer */
+    struct scstrreplace_ibuf *firstbuf, *curbuf;
+    firstbuf = curbuf = calloc(1, sizeof(struct scstrreplace_ibuf));
+    if (!firstbuf) return sstrn(NULL, 0);
+    firstbuf->buf = calloc(ibuflen, sizeof(size_t));
+    if (!firstbuf->buf) {
+        free(firstbuf);
+        return sstrn(NULL, 0);
+    }
+
+    /* Search occurrences */
+    scstr_t searchstr = str;
+    size_t found = 0;
+    do {
+        scstr_t match = scstrscstr(searchstr, pattern);
+        if (match.length > 0) {
+            /* Allocate next buffer in chain, if required */
+            if (curbuf->len == ibuflen) {
+                struct scstrreplace_ibuf *nextbuf =
+                        calloc(1, sizeof(struct scstrreplace_ibuf));
+                if (!nextbuf) {
+                    scstrrepl_free_ibuf(firstbuf);
+                    return sstrn(NULL, 0);
+                }
+                nextbuf->buf = calloc(ibuflen, sizeof(size_t));
+                if (!nextbuf->buf) {
+                    free(nextbuf);
+                    scstrrepl_free_ibuf(firstbuf);
+                    return sstrn(NULL, 0);
+                }
+                curbuf->next = nextbuf;
+                curbuf = nextbuf;
+            }
+
+            /* Record match index */
+            found++;
+            size_t idx = match.ptr - str.ptr;
+            curbuf->buf[curbuf->len++] = idx;
+            searchstr.ptr = match.ptr + pattern.length;
+            searchstr.length = str.length - idx - pattern.length;
+        } else {
+            break;
+        }
+    } while (searchstr.length > 0 && found < replmax);
+
+    /* Allocate result string */
+    sstr_t result;
+    {
+        ssize_t adjlen = (ssize_t) replacement.length - (ssize_t) pattern.length;
+        size_t rcount = 0;
+        curbuf = firstbuf;
+        do {
+            rcount += curbuf->len;
+            curbuf = curbuf->next;
+        } while (curbuf);
+        result.length = str.length + rcount * adjlen;
+        result.ptr = almalloc(allocator, result.length);
+        if (!result.ptr) {
+            scstrrepl_free_ibuf(firstbuf);
+            return sstrn(NULL, 0);
+        }
+    }
+
+    /* Build result string */
+    curbuf = firstbuf;
+    size_t srcidx = 0;
+    char* destptr = result.ptr;
+    do {
+        for (size_t i = 0; i < curbuf->len; i++) {
+            /* Copy source part up to next match*/
+            size_t idx = curbuf->buf[i];
+            size_t srclen = idx - srcidx;
+            if (srclen > 0) {
+                memcpy(destptr, str.ptr+srcidx, srclen);
+                destptr += srclen;
+                srcidx += srclen;
+            }
+
+            /* Copy the replacement and skip the source pattern */
+            srcidx += pattern.length;
+            memcpy(destptr, replacement.ptr, replacement.length);
+            destptr += replacement.length;
+        }
+        curbuf = curbuf->next;
+    } while (curbuf);
+    memcpy(destptr, str.ptr+srcidx, str.length-srcidx);
+
+    /* Free index buffer */
+    scstrrepl_free_ibuf(firstbuf);
+
+    return result;
+}
+
+sstr_t scstrreplacen(scstr_t str, scstr_t pattern,
+        scstr_t replacement, size_t replmax) {
+    return scstrreplacen_a(ucx_default_allocator(),
+            str, pattern, replacement, replmax);
+}
+
+
+// type adjustment functions
+scstr_t ucx_sc2sc(scstr_t str) {
+    return str;
+}
+scstr_t ucx_ss2sc(sstr_t str) {
+    scstr_t cs;
+    cs.ptr = str.ptr;
+    cs.length = str.length;
+    return cs;
+}
+scstr_t ucx_ss2c_s(scstr_t c) {
+    return c;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/test.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,91 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/test.h"
+
+UcxTestSuite* ucx_test_suite_new() {
+    UcxTestSuite* suite = (UcxTestSuite*) malloc(sizeof(UcxTestSuite));
+    if (suite != NULL) {
+        suite->success = 0;
+        suite->failure = 0;
+        suite->tests = NULL;
+    }
+
+    return suite;
+}
+
+void ucx_test_suite_free(UcxTestSuite* suite) {
+    UcxTestList *l = suite->tests;
+    while (l != NULL) {
+        UcxTestList *e = l;
+        l = l->next;
+        free(e);
+    }
+    free(suite);
+}
+
+int ucx_test_register(UcxTestSuite* suite, UcxTest test) {
+    if (suite->tests) {
+        UcxTestList *newelem = (UcxTestList*) malloc(sizeof(UcxTestList));
+        if (newelem) {
+            newelem->test = test;
+            newelem->next = NULL;
+            
+            UcxTestList *last = suite->tests;
+            while (last->next) {
+                last = last->next;
+            }
+            last->next = newelem;
+            
+            return EXIT_SUCCESS;
+        } else {
+            return EXIT_FAILURE;
+        }
+    } else {
+        suite->tests = (UcxTestList*) malloc(sizeof(UcxTestList));
+        if (suite->tests) {
+            suite->tests->test = test;
+            suite->tests->next = NULL;
+            
+            return EXIT_SUCCESS;
+        } else {
+            return EXIT_FAILURE;
+        }
+    }
+}
+
+void ucx_test_run(UcxTestSuite* suite, FILE* output) {
+    suite->success = 0;
+    suite->failure = 0;
+    for (UcxTestList* elem = suite->tests ; elem ; elem = elem->next) {
+        elem->test(suite, output);
+    }
+    fwrite("\nAll test completed.\n", 1, 21, output);
+    fprintf(output, "  Total:   %u\n  Success: %u\n  Failure: %u\n",
+            suite->success+suite->failure, suite->success, suite->failure);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,62 @@
+/**
+ * @mainpage UAP Common Extensions
+ * Library with common and useful functions, macros and data structures.
+ * <p>
+ * Latest available source:<br>
+ * <a href="https://sourceforge.net/projects/ucx/files/">
+ * https://sourceforge.net/projects/ucx/files/</a>
+ * </p>
+ * 
+ * <p>
+ * Repositories:<br>
+ * <a href="https://sourceforge.net/p/ucx/code">
+ * https://sourceforge.net/p/ucx/code</a>
+ * -&nbsp;or&nbsp;-
+ * <a href="https://develop.uap-core.de/hg/ucx">
+ * https://develop.uap-core.de/hg/ucx</a>
+ * </p>
+ * 
+ * <h2>LICENCE</h2>
+ * 
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/ucx.h"
+
+int ucx_szmul_impl(size_t a, size_t b, size_t *result) {
+    if(a == 0 || b == 0) {
+        *result = 0;
+        return 0;
+    }
+    size_t r = a * b;
+    if(r / b == a) {
+        *result = r;
+        return 0;
+    } else {
+        *result = 0;
+        return 1;
+    }
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/allocator.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,206 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * Allocator for custom memory management.
+ * 
+ * A UCX allocator consists of a pointer to the memory area / pool and four
+ * function pointers to memory management functions operating on this memory
+ * area / pool. These functions shall behave equivalent to the standard libc
+ * functions <code>malloc(), calloc(), realloc()</code> and <code>free()</code>.
+ * 
+ * The signature of the memory management functions is based on the signature
+ * of the respective libc function but each of them takes the pointer to the
+ * memory area / pool as first argument.
+ * 
+ * As the pointer to the memory area / pool can be arbitrarily chosen, any data
+ * can be provided to the memory management functions. A UcxMempool is just
+ * one example.
+ * 
+ * @see mempool.h
+ * @see UcxMap
+ * 
+ * @file   allocator.h
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_ALLOCATOR_H
+#define	UCX_ALLOCATOR_H
+
+#include "ucx.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/**
+ * A function pointer to the allocators <code>malloc()</code> function.
+ * @see UcxAllocator
+ */
+typedef void*(*ucx_allocator_malloc)(void *pool, size_t n);
+
+/**
+ * A function pointer to the allocators <code>calloc()</code> function.
+ * @see UcxAllocator
+ */
+typedef void*(*ucx_allocator_calloc)(void *pool, size_t n, size_t size);
+
+/**
+ * A function pointer to the allocators <code>realloc()</code> function.
+ * @see UcxAllocator
+ */
+typedef void*(*ucx_allocator_realloc)(void *pool, void *data, size_t n);
+
+/**
+ * A function pointer to the allocators <code>free()</code> function.
+ * @see UcxAllocator
+ */
+typedef void(*ucx_allocator_free)(void *pool, void *data);
+
+/**
+ * UCX allocator data structure containing memory management functions.
+ */
+typedef struct {
+    /** Pointer to an area of memory or a complex memory pool.
+     * This pointer will be passed to any memory management function as first
+     * argument.
+     */
+    void *pool;
+    /**
+     * The <code>malloc()</code> function for this allocator.
+     */
+    ucx_allocator_malloc  malloc;
+    /**
+     * The <code>calloc()</code> function for this allocator.
+     */
+    ucx_allocator_calloc  calloc;
+    /**
+     * The <code>realloc()</code> function for this allocator.
+     */
+    ucx_allocator_realloc realloc;
+    /**
+     * The <code>free()</code> function for this allocator.
+     */
+    ucx_allocator_free    free;
+} UcxAllocator;
+
+/**
+ * Returns a pointer to the default allocator.
+ * 
+ * The default allocator contains wrappers to the standard libc memory
+ * management functions. Use this function to get a pointer to a globally
+ * available allocator. You may also define an own UcxAllocator by assigning
+ * #UCX_ALLOCATOR_DEFAULT to a variable and pass the address of this variable
+ * to any function that takes a UcxAllocator as argument. Note that using
+ * this function is the recommended way of passing a default allocator, thus
+ * it never runs out of scope.
+ * 
+ * @return a pointer to the default allocator
+ * 
+ * @see UCX_ALLOCATOR_DEFAULT
+ */
+UcxAllocator *ucx_default_allocator();
+
+/**
+ * A wrapper for the standard libc <code>malloc()</code> function.
+ * @param ignore ignored (may be used by allocators for pooled memory)
+ * @param n argument passed to <code>malloc()</code>
+ * @return return value of <code>malloc()</code>
+ */
+void *ucx_default_malloc(void *ignore, size_t n);
+/**
+ * A wrapper for the standard libc <code>calloc()</code> function.
+ * @param ignore ignored (may be used by allocators for pooled memory)
+ * @param n argument passed to <code>calloc()</code>
+ * @param size  argument passed to <code>calloc()</code>
+ * @return return value of <code>calloc()</code>
+ */
+void *ucx_default_calloc(void *ignore, size_t n, size_t size);
+/**
+ * A wrapper for the standard libc <code>realloc()</code> function.
+ * @param ignore ignored (may be used by allocators for pooled memory)
+ * @param data argumend passed to <code>realloc()</code>
+ * @param n argument passed to <code>realloc()</code>
+ * @return return value of <code>realloc()</code>
+ */
+void *ucx_default_realloc(void *ignore, void *data, size_t n);
+/**
+ * A wrapper for the standard libc <code>free()</code> function.
+ * @param ignore ignored (may be used by allocators for pooled memory)
+ * @param data argument passed to <code>free()</code>
+ */
+void ucx_default_free(void *ignore, void *data);
+
+/**
+ * Shorthand for calling an allocators malloc function.
+ * @param allocator the allocator to use
+ * @param n size of space to allocate
+ * @return a pointer to the allocated memory area
+ */
+#define almalloc(allocator, n) ((allocator)->malloc((allocator)->pool, n))
+
+/**
+ * Shorthand for calling an allocators calloc function.
+ * @param allocator the allocator to use
+ * @param n the count of elements the space should be allocated for
+ * @param size the size of each element
+ * @return a pointer to the allocated memory area
+ */
+#define alcalloc(allocator, n, size) \
+        ((allocator)->calloc((allocator)->pool, n, size))
+
+/**
+ * Shorthand for calling an allocators realloc function.
+ * @param allocator the allocator to use
+ * @param ptr the pointer to the memory area that shall be reallocated
+ * @param n the new size of the allocated memory area
+ * @return a pointer to the reallocated memory area
+ */
+#define alrealloc(allocator, ptr, n) \
+        ((allocator)->realloc((allocator)->pool, ptr, n))
+
+/**
+ * Shorthand for calling an allocators free function.
+ * @param allocator the allocator to use
+ * @param ptr the pointer to the memory area that shall be freed
+ */
+#define alfree(allocator, ptr) ((allocator)->free((allocator)->pool, ptr))
+
+/**
+ * Convenient macro for a default allocator <code>struct</code> definition.
+ */
+#define UCX_ALLOCATOR_DEFAULT {NULL, \
+        ucx_default_malloc, ucx_default_calloc, ucx_default_realloc, \
+        ucx_default_free }
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_ALLOCATOR_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/array.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,460 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2019 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * Dynamically allocated array implementation.
+ * 
+ * @file   array.h
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_ARRAY_H
+#define	UCX_ARRAY_H
+
+#include "ucx.h"
+#include "allocator.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/**
+ * UCX array type.
+ */
+typedef struct {
+    /**
+     * The current capacity of the array.
+     */
+    size_t capacity;
+    /**
+     * The actual number of elements in the array.
+     */
+    size_t size;
+    /**
+     * The size of an individual element in bytes.
+     */
+    size_t elemsize;
+    /**
+     * A pointer to the data.
+     */
+    void* data;
+    /**
+     * The allocator used for the data.
+     */
+    UcxAllocator* allocator;
+} UcxArray;
+
+/**
+ * Sets an element in an arbitrary user defined array.
+ * The data is copied from the specified data location.
+ * 
+ * If the capacity is insufficient, the array is automatically reallocated and
+ * the possibly new pointer is stored in the <code>array</code> argument.
+ * 
+ * On reallocation the capacity of the array is doubled until it is sufficient.
+ * The new capacity is stored back to <code>capacity</code>.
+ *  
+ * @param array a pointer to location of the array pointer
+ * @param capacity a pointer to the capacity
+ * @param elmsize the size of each element
+ * @param idx the index of the element to set
+ * @param data a pointer to the element data
+ * @return zero on success or non-zero on error (errno will be set)
+ */
+#define ucx_array_util_set(array, capacity, elmsize, idx, data) \
+    ucx_array_util_set_a(ucx_default_allocator(), (void**)(array), capacity, \
+                         elmsize, idx, data)
+
+/**
+ * Sets an element in an arbitrary user defined array.
+ * The data is copied from the specified data location.
+ * 
+ * If the capacity is insufficient, the array is automatically reallocated
+ * using the specified allocator and the possibly new pointer is stored in
+ * the <code>array</code> argument.
+ * 
+ * On reallocation the capacity of the array is doubled until it is sufficient.
+ * The new capacity is stored back to <code>capacity</code>. 
+ * 
+ * @param alloc the allocator that shall be used to reallocate the array
+ * @param array a pointer to location of the array pointer
+ * @param capacity a pointer to the capacity
+ * @param elmsize the size of each element
+ * @param idx the index of the element to set
+ * @param data a pointer to the element data
+ * @return zero on success or non-zero on error (errno will be set)
+ */
+int ucx_array_util_set_a(UcxAllocator* alloc, void** array, size_t* capacity,
+    size_t elmsize, size_t idx, void* data);
+
+/**
+ * Stores a pointer in an arbitrary user defined array.
+ * The element size of the array must be sizeof(void*).
+ * 
+ * If the capacity is insufficient, the array is automatically reallocated and
+ * the possibly new pointer is stored in the <code>array</code> argument.
+ * 
+ * On reallocation the capacity of the array is doubled until it is sufficient.
+ * The new capacity is stored back to <code>capacity</code>.
+ *  
+ * @param array a pointer to location of the array pointer
+ * @param capacity a pointer to the capacity
+ * @param idx the index of the element to set
+ * @param ptr the pointer to store
+ * @return zero on success or non-zero on error (errno will be set)
+ */
+#define ucx_array_util_setptr(array, capacity, idx, ptr) \
+    ucx_array_util_setptr_a(ucx_default_allocator(), (void**)(array), \
+                            capacity, idx, ptr)
+
+/**
+ * Stores a pointer in an arbitrary user defined array.
+ * The element size of the array must be sizeof(void*).
+ * 
+ * If the capacity is insufficient, the array is automatically reallocated
+ * using the specified allocator and the possibly new pointer is stored in
+ * the <code>array</code> argument.
+ * 
+ * On reallocation the capacity of the array is doubled until it is sufficient.
+ * The new capacity is stored back to <code>capacity</code>. 
+ * 
+ * @param alloc the allocator that shall be used to reallocate the array
+ * @param array a pointer to location of the array pointer
+ * @param capacity a pointer to the capacity
+ * @param idx the index of the element to set
+ * @param ptr the pointer to store
+ * @return zero on success or non-zero on error (errno will be set)
+ */
+int ucx_array_util_setptr_a(UcxAllocator* alloc, void** array, size_t* capacity,
+    size_t idx, void* ptr);
+
+
+/**
+ * Creates a new UCX array with the given capacity and element size.
+ * @param capacity the initial capacity
+ * @param elemsize the element size
+ * @return a pointer to a new UCX array structure
+ */
+UcxArray* ucx_array_new(size_t capacity, size_t elemsize);
+
+/**
+ * Creates a new UCX array using the specified allocator.
+ * 
+ * @param capacity the initial capacity
+ * @param elemsize the element size
+ * @param allocator the allocator to use
+ * @return a pointer to new UCX array structure
+ */
+UcxArray* ucx_array_new_a(size_t capacity, size_t elemsize,
+        UcxAllocator* allocator);
+
+/**
+ * Initializes a UCX array structure with the given capacity and element size.
+ * The structure must be uninitialized as the data pointer will be overwritten.
+ * 
+ * @param array the structure to initialize
+ * @param capacity the initial capacity
+ * @param elemsize the element size
+ */
+void ucx_array_init(UcxArray* array, size_t capacity, size_t elemsize);
+
+/**
+ * Initializes a UCX array structure using the specified allocator.
+ * The structure must be uninitialized as the data pointer will be overwritten.
+ * 
+ * @param array the structure to initialize
+ * @param capacity the initial capacity
+ * @param elemsize the element size
+ * @param allocator the allocator to use
+ */
+void ucx_array_init_a(UcxArray* array, size_t capacity, size_t elemsize,
+        UcxAllocator* allocator);
+
+/**
+ * Creates an shallow copy of an array.
+ * 
+ * This function clones the specified array by using memcpy().
+ * If the destination capacity is insufficient, an automatic reallocation is
+ * attempted.
+ * 
+ * Note: if the destination array is uninitialized, the behavior is undefined.
+ * 
+ * @param dest the array to copy to
+ * @param src the array to copy from
+ * @return zero on success, non-zero on reallocation failure.
+ */
+int ucx_array_clone(UcxArray* dest, UcxArray const* src);
+
+
+/**
+ * Compares two UCX arrays element-wise by using a compare function.
+ *
+ * Elements of the two specified arrays are compared by using the specified
+ * compare function and the additional data. The type and content of this
+ * additional data depends on the cmp_func() used.
+ * 
+ * This function always returns zero, if the element sizes of the arrays do
+ * not match and performs no comparisons in this case.
+ * 
+ * @param array1 the first array
+ * @param array2 the second array
+ * @param cmpfnc the compare function
+ * @param data additional data for the compare function
+ * @return 1, if and only if the two arrays equal element-wise, 0 otherwise
+ */
+int ucx_array_equals(UcxArray const *array1, UcxArray const *array2,
+        cmp_func cmpfnc, void* data);
+
+/**
+ * Destroys the array.
+ * 
+ * The data is freed and both capacity and count are reset to zero.
+ * If the array structure itself has been dynamically allocated, it has to be
+ * freed separately.
+ * 
+ * @param array the array to destroy
+ */
+void ucx_array_destroy(UcxArray *array);
+
+/**
+ * Destroys and frees the array.
+ * 
+ * @param array the array to free
+ */
+void ucx_array_free(UcxArray *array);
+
+/**
+ * Inserts elements at the end of the array.
+ * 
+ * This is an O(1) operation.
+ * The array will automatically grow, if the capacity is exceeded.
+ * If a pointer to data is provided, the data is copied into the array with
+ * memcpy(). Otherwise the new elements are completely zeroed.
+ * 
+ * @param array a pointer the array where to append the data
+ * @param data a pointer to the data to insert (may be <code>NULL</code>)
+ * @param count number of elements to copy from data (if data is
+ * <code>NULL</code>, zeroed elements are appended)
+ * @return zero on success, non-zero if a reallocation was necessary but failed
+ * @see ucx_array_set_from()
+ * @see ucx_array_append()
+ */
+int ucx_array_append_from(UcxArray *array, void *data, size_t count);
+
+
+/**
+ * Inserts elements at the beginning of the array.
+ * 
+ * This is an expensive operation, because the contents must be moved.
+ * If there is no particular reason to prepend data, you should use
+ * ucx_array_append_from() instead.
+ * 
+ * @param array a pointer the array where to prepend the data
+ * @param data a pointer to the data to insert (may be <code>NULL</code>)
+ * @param count number of elements to copy from data (if data is
+ * <code>NULL</code>, zeroed elements are inserted)
+ * @return zero on success, non-zero if a reallocation was necessary but failed
+ * @see ucx_array_append_from()
+ * @see ucx_array_set_from()
+ * @see ucx_array_prepend()
+ */
+int ucx_array_prepend_from(UcxArray *array, void *data, size_t count);
+
+
+/**
+ * Sets elements starting at the specified index.
+ * 
+ * If the any index is out of bounds, the array automatically grows.
+ * The pointer to the data may be NULL, in which case the elements are zeroed. 
+ * 
+ * @param array a pointer the array where to set the data
+ * @param index the index of the element to set
+ * @param data a pointer to the data to insert (may be <code>NULL</code>)
+ * @param count number of elements to copy from data (if data is
+ * <code>NULL</code>, the memory in the array is zeroed)
+ * @return zero on success, non-zero if a reallocation was necessary but failed
+ * @see ucx_array_append_from()
+ * @see ucx_array_set()
+ */
+int ucx_array_set_from(UcxArray *array, size_t index, void *data, size_t count);
+
+/**
+ * Concatenates two arrays.
+ * 
+ * The contents of the second array are appended to the first array in one
+ * single operation. The second array is otherwise left untouched.
+ * 
+ * The first array may grow automatically. If this fails, both arrays remain
+ * unmodified.
+ * 
+ * @param array1 first array
+ * @param array2 second array
+ * @return zero on success, non-zero if reallocation was necessary but failed 
+ * or the element size does not match
+ */
+int ucx_array_concat(UcxArray *array1, const UcxArray *array2);
+
+/**
+ * Returns a pointer to the array element at the specified index.
+ * 
+ * @param array the array to retrieve the element from
+ * @param index index of the element to return
+ * @return a pointer to the element at the specified index or <code>NULL</code>,
+ * if the index is greater than the array size
+ */
+void *ucx_array_at(UcxArray const* array, size_t index);
+
+/**
+ * Returns the index of an element containing the specified data.
+ *
+ * This function uses a cmp_func() to compare the data of each list element
+ * with the specified data. If no cmp_func is provided, memcmp() is used.
+ * 
+ * If the array contains the data more than once, the index of the first
+ * occurrence is returned.
+ * If the array does not contain the data, the size of array is returned.
+ *  
+ * @param array the array where to search for the data
+ * @param elem the element data
+ * @param cmpfnc the compare function
+ * @param data additional data for the compare function
+ * @return the index of the element containing the specified data or the size of
+ * the array, if the data is not found in this array
+ */
+size_t ucx_array_find(UcxArray const *array, void *elem,
+    cmp_func cmpfnc, void *data);
+
+/**
+ * Checks, if an array contains a specific element.
+ * 
+ * An element is found, if ucx_array_find() returns a value less than the size.
+ * 
+ * @param array the array where to search for the data
+ * @param elem the element data
+ * @param cmpfnc the compare function
+ * @param data additional data for the compare function
+ * @return 1, if and only if the array contains the specified element data
+ * @see ucx_array_find()
+ */
+int ucx_array_contains(UcxArray const *array, void *elem,
+    cmp_func cmpfnc, void *data);
+
+/**
+ * Sorts a UcxArray with the best available sort algorithm.
+ * 
+ * The qsort_r() function is used, if available (glibc, FreeBSD or MacOS).
+ * The order of arguments is automatically adjusted for the FreeBSD and MacOS
+ * version of qsort_r().
+ * 
+ * If qsort_r() is not available, a merge sort algorithm is used, which is
+ * guaranteed to use no more additional memory than for exactly one element.
+ * 
+ * @param array the array to sort
+ * @param cmpfnc the function that shall be used to compare the element data
+ * @param data additional data for the cmp_func() or <code>NULL</code>
+ */
+void ucx_array_sort(UcxArray* array, cmp_func cmpfnc, void *data);
+
+/**
+ * Removes an element from the array.
+ * 
+ * This is in general an expensive operation, because several elements may
+ * be moved. If the order of the elements is not relevant, use
+ * ucx_array_remove_fast() instead.
+ * 
+ * @param array pointer to the array from which the element shall be removed
+ * @param index the index of the element to remove
+ */
+void ucx_array_remove(UcxArray *array, size_t index);
+
+/**
+ * Removes an element from the array.
+ * 
+ * This is an O(1) operation, but does not maintain the order of the elements.
+ * The last element in the array is moved to the location of the removed
+ * element.
+ * 
+ * @param array pointer to the array from which the element shall be removed
+ * @param index the index of the element to remove
+ */
+void ucx_array_remove_fast(UcxArray *array, size_t index);
+
+/**
+ * Shrinks the memory to exactly fit the contents.
+ * 
+ * After this operation, the capacity equals the size.
+ * 
+ * @param array a pointer to the array
+ * @return zero on success, non-zero if reallocation failed
+ */
+int ucx_array_shrink(UcxArray* array);
+
+/**
+ * Sets the capacity of the array.
+ * 
+ * If the new capacity is smaller than the size of the array, the elements
+ * are removed and the size is adjusted accordingly.
+ * 
+ * @param array a pointer to the array
+ * @param capacity the new capacity
+ * @return zero on success, non-zero if reallocation failed
+ */
+int ucx_array_resize(UcxArray* array, size_t capacity);
+
+/**
+ * Resizes the array only, if the capacity is insufficient.
+ * 
+ * If the requested capacity is smaller than the current capacity, this
+ * function does nothing.
+ * 
+ * @param array a pointer to the array
+ * @param capacity the guaranteed capacity
+ * @return zero on success, non-zero if reallocation failed
+ */
+int ucx_array_reserve(UcxArray* array, size_t capacity);
+
+/**
+ * Resizes the capacity, if the specified number of elements would not fit.
+ * 
+ * A call to ucx_array_grow(array, count) is effectively the same as
+ * ucx_array_reserve(array, array->size+count).
+ * 
+ * @param array a pointer to the array
+ * @param count the number of elements that should additionally fit
+ * into the array
+ * @return zero on success, non-zero if reallocation failed
+ */
+int ucx_array_grow(UcxArray* array, size_t count);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_ARRAY_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/avl.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,353 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+/**
+ * @file avl.h
+ * 
+ * AVL tree implementation.
+ * 
+ * This binary search tree implementation allows average O(1) insertion and
+ * removal of elements (excluding binary search time).
+ * 
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_AVL_H
+#define UCX_AVL_H
+
+#include "ucx.h"
+#include "allocator.h"
+#include <inttypes.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/**
+ * UCX AVL Node type.
+ * 
+ * @see UcxAVLNode
+ */
+typedef struct UcxAVLNode UcxAVLNode;
+
+/**
+ * UCX AVL Node.
+ */
+struct UcxAVLNode {
+    /**
+     * The key for this node.
+     */
+    intptr_t key;
+    /**
+     * Data contained by this node.
+     */
+    void *value;
+    /**
+     * The height of this (sub)-tree.
+     */
+    size_t height;
+    /**
+     * Parent node.
+     */
+    UcxAVLNode *parent;
+    /**
+     * Root node of left subtree.
+     */
+    UcxAVLNode *left;
+    /**
+     * Root node of right subtree.
+     */
+    UcxAVLNode *right;
+};
+
+/**
+ * UCX AVL Tree.
+ */
+typedef struct {
+    /**
+     * The UcxAllocator that shall be used to manage the memory for node data.
+     */
+    UcxAllocator *allocator;
+    /**
+     * Root node of the tree.
+     */
+    UcxAVLNode *root;
+    /**
+     * Compare function that shall be used to compare the UcxAVLNode keys.
+     * @see UcxAVLNode.key
+     */
+    cmp_func cmpfunc;
+    /**
+     * Custom user data.
+     * This data will also be provided to the cmpfunc.
+     */
+    void *userdata;
+} UcxAVLTree;
+
+/**
+ * Initializes a new UcxAVLTree with a default allocator.
+ * 
+ * @param cmpfunc the compare function that shall be used
+ * @return a new UcxAVLTree object
+ * @see ucx_avl_new_a()
+ */
+UcxAVLTree *ucx_avl_new(cmp_func cmpfunc);
+
+/**
+ * Initializes a new UcxAVLTree with the specified allocator.
+ * 
+ * The cmpfunc should be capable of comparing two keys within this AVL tree.
+ * So if you want to use null terminated strings as keys, you could use the
+ * ucx_cmp_str() function here.
+ * 
+ * @param cmpfunc the compare function that shall be used
+ * @param allocator the UcxAllocator that shall be used
+ * @return a new UcxAVLTree object
+ */
+UcxAVLTree *ucx_avl_new_a(cmp_func cmpfunc, UcxAllocator *allocator);
+
+/**
+ * Destroys a UcxAVLTree.
+ * 
+ * Note, that the contents are not automatically freed.
+ * Use may use #ucx_avl_free_content() before calling this function.
+ * 
+ * @param tree the tree to destroy
+ * @see ucx_avl_free_content()
+ */
+void ucx_avl_free(UcxAVLTree *tree);
+
+/**
+ * Frees the contents of a UcxAVLTree.
+ * 
+ * This is a convenience function that iterates over the tree and passes all
+ * values to the specified destructor function.
+ * 
+ * If no destructor is specified (<code>NULL</code>), the free() function of
+ * the tree's own allocator is used.
+ * 
+ * You must ensure, that it is valid to pass each value in the map to the same
+ * destructor function.
+ * 
+ * You should free the entire tree afterwards, as the contents will be invalid.
+ * 
+ * @param tree for which the contents shall be freed
+ * @param destr optional pointer to a destructor function
+ * @see ucx_avl_free()
+ */
+void ucx_avl_free_content(UcxAVLTree *tree, ucx_destructor destr);
+
+/**
+ * Macro for initializing a new UcxAVLTree with the default allocator and a
+ * ucx_cmp_ptr() compare function.
+ * 
+ * @return a new default UcxAVLTree object
+ */
+#define ucx_avl_default_new() \
+    ucx_avl_new_a(ucx_cmp_ptr, ucx_default_allocator())
+
+/**
+ * Gets the node from the tree, that is associated with the specified key.
+ * @param tree the UcxAVLTree
+ * @param key the key
+ * @return the node (or <code>NULL</code>, if the key is not present)
+ */
+UcxAVLNode *ucx_avl_get_node(UcxAVLTree *tree, intptr_t key);
+
+/**
+ * Gets the value from the tree, that is associated with the specified key.
+ * @param tree the UcxAVLTree
+ * @param key the key
+ * @return the value (or <code>NULL</code>, if the key is not present)
+ */
+void *ucx_avl_get(UcxAVLTree *tree, intptr_t key);
+
+/**
+ * A mode for #ucx_avl_find_node() with the same behavior as
+ * #ucx_avl_get_node().
+ */
+#define UCX_AVL_FIND_EXACT         0
+/**
+ * A mode for #ucx_avl_find_node() finding the node whose key is at least
+ * as large as the specified key.
+ */
+#define UCX_AVL_FIND_LOWER_BOUNDED 1
+/**
+ * A mode for #ucx_avl_find_node() finding the node whose key is at most
+ * as large as the specified key.
+ */
+#define UCX_AVL_FIND_UPPER_BOUNDED 2
+/**
+ * A mode for #ucx_avl_find_node() finding the node with a key that is as close
+ * to the specified key as possible. If the key is present, the behavior is
+ * like #ucx_avl_get_node(). This mode only returns <code>NULL</code> on
+ * empty trees.
+ */
+#define UCX_AVL_FIND_CLOSEST       3
+
+/**
+ * Finds a node within the tree. The following modes are supported:
+ * <ul>
+ * <li>#UCX_AVL_FIND_EXACT: the same behavior as #ucx_avl_get_node()</li>
+ * <li>#UCX_AVL_FIND_LOWER_BOUNDED: finds the node whose key is at least
+ * as large as the specified key</li>
+ * <li>#UCX_AVL_FIND_UPPER_BOUNDED: finds the node whose key is at most
+ * as large as the specified key</li>
+ * <li>#UCX_AVL_FIND_CLOSEST: finds the node with a key that is as close to
+ * the specified key as possible. If the key is present, the behavior is
+ * like #ucx_avl_get_node(). This mode only returns <code>NULL</code> on
+ * empty trees.</li> 
+ * </ul>
+ * 
+ * The distance function provided MUST agree with the compare function of
+ * the AVL tree.
+ * 
+ * @param tree the UcxAVLTree
+ * @param key the key
+ * @param dfnc the distance function
+ * @param mode the find mode
+ * @return the node (or <code>NULL</code>, if no node can be found)
+ */
+UcxAVLNode *ucx_avl_find_node(UcxAVLTree *tree, intptr_t key,
+        distance_func dfnc, int mode);
+
+/**
+ * Finds a value within the tree.
+ * See #ucx_avl_find_node() for details.
+ * 
+ * @param tree the UcxAVLTree
+ * @param key the key
+ * @param dfnc the distance function
+ * @param mode the find mode
+ * @return the value (or <code>NULL</code>, if no value can be found)
+ */
+void *ucx_avl_find(UcxAVLTree *tree, intptr_t key,
+        distance_func dfnc, int mode);
+
+/**
+ * Puts a key/value pair into the tree.
+ * 
+ * Attention: use this function only, if a possible old value does not need
+ * to be preserved.
+ * 
+ * @param tree the UcxAVLTree
+ * @param key the key
+ * @param value the new value
+ * @return zero, if and only if the operation succeeded
+ */
+int ucx_avl_put(UcxAVLTree *tree, intptr_t key, void *value);
+
+/**
+ * Puts a key/value pair into the tree.
+ * 
+ * This is a secure function which saves the old value to the variable pointed
+ * at by oldvalue.
+ * 
+ * @param tree the UcxAVLTree
+ * @param key the key
+ * @param value the new value
+ * @param oldvalue optional: a pointer to the location where a possible old
+ * value shall be stored
+ * @return zero, if and only if the operation succeeded
+ */
+int ucx_avl_put_s(UcxAVLTree *tree, intptr_t key, void *value, void **oldvalue);
+
+/**
+ * Removes a node from the AVL tree.
+ * 
+ * Note: the specified node is logically removed. The tree implementation
+ * decides which memory area is freed. In most cases the here provided node
+ * is freed, so its further use is generally undefined.
+ * 
+ * @param tree the UcxAVLTree
+ * @param node the node to remove
+ * @return zero, if and only if an element has been removed
+ */
+int ucx_avl_remove_node(UcxAVLTree *tree, UcxAVLNode *node);
+
+/**
+ * Removes an element from the AVL tree.
+ * 
+ * @param tree the UcxAVLTree
+ * @param key the key
+ * @return zero, if and only if an element has been removed
+ */
+int ucx_avl_remove(UcxAVLTree *tree, intptr_t key);
+
+/**
+ * Removes an element from the AVL tree.
+ * 
+ * This is a secure function which saves the old key and value data from node
+ * to the variables at the location of oldkey and oldvalue (if specified), so
+ * they can be freed afterwards (if necessary).
+ * 
+ * Note: the returned key in oldkey is possibly not the same as the provided
+ * key for the lookup (in terms of memory location).
+ * 
+ * @param tree the UcxAVLTree
+ * @param key the key of the element to remove
+ * @param oldkey optional: a pointer to the location where the old key shall be
+ * stored
+ * @param oldvalue optional: a pointer to the location where the old value
+ * shall be stored
+ * @return zero, if and only if an element has been removed
+ */
+int ucx_avl_remove_s(UcxAVLTree *tree, intptr_t key,
+        intptr_t *oldkey, void **oldvalue);
+
+/**
+ * Counts the nodes in the specified UcxAVLTree.
+ * @param tree the AVL tree
+ * @return the node count
+ */
+size_t ucx_avl_count(UcxAVLTree *tree);
+
+/**
+ * Finds the in-order predecessor of the given node.
+ * @param node an AVL node
+ * @return the in-order predecessor of the given node, or <code>NULL</code> if
+ * the given node is the in-order minimum
+ */
+UcxAVLNode* ucx_avl_pred(UcxAVLNode* node);
+
+/**
+ * Finds the in-order successor of the given node.
+ * @param node an AVL node
+ * @return the in-order successor of the given node, or <code>NULL</code> if
+ * the given node is the in-order maximum
+ */
+UcxAVLNode* ucx_avl_succ(UcxAVLNode* node);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_AVL_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/buffer.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,339 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @file buffer.h
+ * 
+ * Advanced buffer implementation.
+ * 
+ * Instances of UcxBuffer can be used to read from or to write to like one
+ * would do with a stream. This allows the use of ucx_stream_copy() to copy
+ * contents from one buffer to another.
+ * 
+ * Some features for convenient use of the buffer
+ * can be enabled. See the documentation of the macro constants for more
+ * information.
+ * 
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_BUFFER_H
+#define	UCX_BUFFER_H
+
+#include "ucx.h"
+#include <sys/types.h>
+#include <stdio.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/**
+ * No buffer features enabled (all flags cleared).
+ */
+#define UCX_BUFFER_DEFAULT      0x00
+
+/**
+ * If this flag is enabled, the buffer will automatically free its contents.
+ */
+#define UCX_BUFFER_AUTOFREE     0x01
+
+/**
+ * If this flag is enabled, the buffer will automatically extends its capacity.
+ */
+#define UCX_BUFFER_AUTOEXTEND   0x02
+
+/** UCX Buffer. */
+typedef struct {
+    /** A pointer to the buffer contents. */
+    char *space;
+    /** Current position of the buffer. */
+    size_t pos;
+    /** Current capacity (i.e. maximum size) of the buffer. */
+    size_t capacity;
+    /** Current size of the buffer content. */
+    size_t size;
+    /**
+     * Flag register for buffer features.
+     * @see #UCX_BUFFER_DEFAULT
+     * @see #UCX_BUFFER_AUTOFREE
+     * @see #UCX_BUFFER_AUTOEXTEND
+     */
+    int flags;
+} UcxBuffer;
+
+/**
+ * Creates a new buffer.
+ * 
+ * <b>Note:</b> you may provide <code>NULL</code> as argument for
+ * <code>space</code>. Then this function will allocate the space and enforce
+ * the #UCX_BUFFER_AUTOFREE flag.
+ * 
+ * @param space pointer to the memory area, or <code>NULL</code> to allocate
+ * new memory
+ * @param capacity the capacity of the buffer
+ * @param flags buffer features (see UcxBuffer.flags)
+ * @return the new buffer
+ */
+UcxBuffer *ucx_buffer_new(void *space, size_t capacity, int flags);
+
+/**
+ * Destroys a buffer.
+ * 
+ * If the #UCX_BUFFER_AUTOFREE feature is enabled, the contents of the buffer
+ * are also freed.
+ * 
+ * @param buffer the buffer to destroy
+ */
+void ucx_buffer_free(UcxBuffer* buffer);
+
+/**
+ * Creates a new buffer and fills it with extracted content from another buffer.
+ * 
+ * <b>Note:</b> the #UCX_BUFFER_AUTOFREE feature is enforced for the new buffer.
+ * 
+ * @param src the source buffer
+ * @param start the start position of extraction
+ * @param length the count of bytes to extract (must not be zero)
+ * @param flags feature mask for the new buffer
+ * @return a new buffer containing the extraction
+ */
+UcxBuffer* ucx_buffer_extract(UcxBuffer *src,
+        size_t start, size_t length, int flags);
+
+/**
+ * A shorthand macro for the full extraction of the buffer.
+ * 
+ * @param src the source buffer
+ * @param flags feature mask for the new buffer
+ * @return a new buffer with the extracted content
+ */
+#define ucx_buffer_clone(src,flags) \
+    ucx_buffer_extract(src, 0, (src)->capacity, flags)
+
+
+/**
+ * Shifts the contents of the buffer by the given offset.
+ * 
+ * If the offset is positive, the contents are shifted to the right.
+ * If auto extension is enabled, the buffer grows, if necessary.
+ * In case the auto extension fails, this function returns a non-zero value and
+ * no contents are changed.
+ * If auto extension is disabled, the contents that do not fit into the buffer
+ * are discarded.
+ * 
+ * If the offset is negative, the contents are shifted to the left where the
+ * first <code>shift</code> bytes are discarded.
+ * The new size of the buffer is the old size minus
+ * the absolute shift value.
+ * If this value is larger than the buffer size, the buffer is emptied (but
+ * not cleared, see the security note below).
+ * 
+ * The buffer position gets shifted alongside with the content but is kept
+ * within the boundaries of the buffer.
+ * 
+ * <b>Security note:</b> the shifting operation does <em>not</em> erase the
+ * previously occupied memory cells. You can easily do that manually, e.g. by
+ * calling <code>memset(buffer->space, 0, shift)</code> for a right shift or
+ * <code>memset(buffer->size, 0, buffer->capacity-buffer->size)</code>
+ * for a left shift.
+ * 
+ * @param buffer the buffer
+ * @param shift the shift offset (negative means left shift)
+ * @return 0 on success, non-zero if a required auto-extension fails
+ */
+int ucx_buffer_shift(UcxBuffer* buffer, off_t shift);
+
+/**
+ * Shifts the buffer to the right.
+ * See ucx_buffer_shift() for details.
+ * 
+ * @param buffer the buffer
+ * @param shift the shift offset
+ * @return 0 on success, non-zero if a required auto-extension fails
+ * @see ucx_buffer_shift()
+ */
+int ucx_buffer_shift_right(UcxBuffer* buffer, size_t shift);
+
+/**
+ * Shifts the buffer to the left.
+ * 
+ * See ucx_buffer_shift() for details. Note, however, that this method expects
+ * a positive shift offset.
+ * 
+ * Since a left shift cannot fail due to memory allocation problems, this
+ * function always returns zero.
+ * 
+ * @param buffer the buffer
+ * @param shift the shift offset
+ * @return always zero
+ * @see ucx_buffer_shift()
+ */
+int ucx_buffer_shift_left(UcxBuffer* buffer, size_t shift);
+
+
+/**
+ * Moves the position of the buffer.
+ * 
+ * The new position is relative to the <code>whence</code> argument.
+ *
+ * SEEK_SET marks the start of the buffer.
+ * SEEK_CUR marks the current position.
+ * SEEK_END marks the end of the buffer.
+ * 
+ * With an offset of zero, this function sets the buffer position to zero
+ * (SEEK_SET), the buffer size (SEEK_END) or leaves the buffer position
+ * unchanged (SEEK_CUR).
+ * 
+ * @param buffer
+ * @param offset position offset relative to <code>whence</code>
+ * @param whence one of SEEK_SET, SEEK_CUR or SEEK_END
+ * @return 0 on success, non-zero if the position is invalid
+ *
+ */
+int ucx_buffer_seek(UcxBuffer *buffer, off_t offset, int whence);
+
+/**
+ * Clears the buffer by resetting the position and deleting the data.
+ * 
+ * The data is deleted by a zeroing it with call to <code>memset()</code>.
+ * 
+ * @param buffer the buffer to be cleared
+ */
+#define ucx_buffer_clear(buffer) memset((buffer)->space, 0, (buffer)->size); \
+        (buffer)->size = 0; (buffer)->pos = 0;
+
+/**
+ * Tests, if the buffer position has exceeded the buffer capacity.
+ * 
+ * @param buffer the buffer to test
+ * @return non-zero, if the current buffer position has exceeded the last
+ * available byte of the buffer.
+ */
+int ucx_buffer_eof(UcxBuffer *buffer);
+
+
+/**
+ * Extends the capacity of the buffer.
+ * 
+ * <b>Note:</b> The buffer capacity increased by a power of two. I.e.
+ * the buffer capacity is doubled, as long as it would not hold the current
+ * content plus the additional required bytes.
+ * 
+ * <b>Attention:</b> the argument provided is the number of <i>additional</i>
+ * bytes the buffer shall hold. It is <b>NOT</b> the total number of bytes the
+ * buffer shall hold.
+ * 
+ * @param buffer the buffer to extend
+ * @param additional_bytes the number of additional bytes the buffer shall
+ * <i>at least</i> hold
+ * @return 0 on success or a non-zero value on failure
+ */
+int ucx_buffer_extend(UcxBuffer *buffer, size_t additional_bytes);
+
+/**
+ * Writes data to a UcxBuffer.
+ * 
+ * The position of the buffer is increased by the number of bytes written.
+ * 
+ * @param ptr a pointer to the memory area containing the bytes to be written
+ * @param size the length of one element
+ * @param nitems the element count
+ * @param buffer the UcxBuffer to write to
+ * @return the total count of bytes written
+ */
+size_t ucx_buffer_write(const void *ptr, size_t size, size_t nitems,
+        UcxBuffer *buffer);
+
+/**
+ * Reads data from a UcxBuffer.
+ * 
+ * The position of the buffer is increased by the number of bytes read.
+ * 
+ * @param ptr a pointer to the memory area where to store the read data
+ * @param size the length of one element
+ * @param nitems the element count
+ * @param buffer the UcxBuffer to read from
+ * @return the total number of elements read
+ */
+size_t ucx_buffer_read(void *ptr, size_t size, size_t nitems,
+        UcxBuffer *buffer);
+
+/**
+ * Writes a character to a buffer.
+ * 
+ * The least significant byte of the argument is written to the buffer. If the
+ * end of the buffer is reached and #UCX_BUFFER_AUTOEXTEND feature is enabled,
+ * the buffer capacity is extended by ucx_buffer_extend(). If the feature is
+ * disabled or buffer extension fails, <code>EOF</code> is returned.
+ * 
+ * On successful write the position of the buffer is increased.
+ * 
+ * @param buffer the buffer to write to
+ * @param c the character to write as <code>int</code> value
+ * @return the byte that has bean written as <code>int</code> value or
+ * <code>EOF</code> when the end of the stream is reached and automatic
+ * extension is not enabled or not possible
+ */
+int ucx_buffer_putc(UcxBuffer *buffer, int c);
+
+/**
+ * Gets a character from a buffer.
+ * 
+ * The current position of the buffer is increased after a successful read.
+ * 
+ * @param buffer the buffer to read from
+ * @return the character as <code>int</code> value or <code>EOF</code>, if the
+ * end of the buffer is reached
+ */
+int ucx_buffer_getc(UcxBuffer *buffer);
+
+/**
+ * Writes a string to a buffer.
+ * 
+ * @param buffer the buffer
+ * @param str the string
+ * @return the number of bytes written
+ */
+size_t ucx_buffer_puts(UcxBuffer *buffer, const char *str);
+
+/**
+ * Returns the complete buffer content as sstr_t.
+ * @param buffer the buffer
+ * @return the result of <code>sstrn()</code> with the buffer space and size
+ * as arguments
+ */
+#define ucx_buffer_to_sstr(buffer) sstrn((buffer)->space, (buffer)->size)
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_BUFFER_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/list.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,512 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * Doubly linked list implementation.
+ * 
+ * @file   list.h
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_LIST_H
+#define	UCX_LIST_H
+
+#include "ucx.h"
+#include "allocator.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/**
+ * Loop statement for UCX lists.
+ * 
+ * The first argument is the name of the iteration variable. The scope of
+ * this variable is limited to the <code>UCX_FOREACH</code> statement.
+ * 
+ * The second argument is a pointer to the list. In most cases this will be the
+ * pointer to the first element of the list, but it may also be an arbitrary
+ * element of the list. The iteration will then start with that element.
+ * 
+ * @param list The first element of the list
+ * @param elem The variable name of the element
+ */
+#define UCX_FOREACH(elem,list) \
+        for (UcxList* elem = (UcxList*) list ; elem != NULL ; elem = elem->next)
+
+/**
+ * UCX list type.
+ * @see UcxList
+ */
+typedef struct UcxList UcxList;
+
+/**
+ * UCX list structure.
+ */
+struct UcxList {
+    /**
+     * List element payload.
+     */
+    void    *data;
+    /**
+     * Pointer to the next list element or <code>NULL</code>, if this is the
+     * last element.
+     */
+    UcxList *next;
+    /**
+     * Pointer to the previous list element or <code>NULL</code>, if this is
+     * the first element.
+     */
+    UcxList *prev;
+};
+
+/**
+ * Creates an element-wise copy of a list.
+ * 
+ * This function clones the specified list by creating new list elements and
+ * copying the data with the specified copy_func(). If no copy_func() is
+ * specified, a shallow copy is created and the new list will reference the
+ * same data as the source list.
+ * 
+ * @param list the list to copy
+ * @param cpyfnc a pointer to the function that shall copy an element (may be
+ * <code>NULL</code>)
+ * @param data additional data for the copy_func()
+ * @return a pointer to the copy
+ */
+UcxList *ucx_list_clone(const UcxList *list, copy_func cpyfnc, void* data);
+
+/**
+ * Creates an element-wise copy of a list using a UcxAllocator.
+ * 
+ * See ucx_list_clone() for details.
+ * 
+ * You might want to pass the allocator via the <code>data</code> parameter,
+ * to access it within the copy function for making deep copies.
+ * 
+ * @param allocator the allocator to use
+ * @param list the list to copy
+ * @param cpyfnc a pointer to the function that shall copy an element (may be
+ * <code>NULL</code>)
+ * @param data additional data for the copy_func()
+ * @return a pointer to the copy
+ * @see ucx_list_clone()
+ */
+UcxList *ucx_list_clone_a(UcxAllocator *allocator, const UcxList *list,
+        copy_func cpyfnc, void* data);
+
+/**
+ * Compares two UCX lists element-wise by using a compare function.
+ * 
+ * Each element of the two specified lists are compared by using the specified
+ * compare function and the additional data. The type and content of this
+ * additional data depends on the cmp_func() used.
+ * 
+ * If the list pointers denote elements within a list, the lists are compared
+ * starting with the denoted elements. Thus any previous elements are not taken
+ * into account. This might be useful to check, if certain list tails match
+ * each other.
+ * 
+ * @param list1 the first list
+ * @param list2 the second list
+ * @param cmpfnc the compare function
+ * @param data additional data for the compare function
+ * @return 1, if and only if the two lists equal element-wise, 0 otherwise
+ */
+int ucx_list_equals(const UcxList *list1, const UcxList *list2,
+        cmp_func cmpfnc, void* data);
+
+/**
+ * Destroys the entire list.
+ * 
+ * The members of the list are not automatically freed, so ensure they are
+ * otherwise referenced or destroyed by ucx_list_free_contents().
+ * Otherwise, a memory leak is likely to occur.
+ * 
+ * <b>Caution:</b> the argument <b>MUST</b> denote an entire list (i.e. a call
+ * to ucx_list_first() on the argument must return the argument itself)
+ * 
+ * @param list the list to free
+ * @see ucx_list_free_contents()
+ */
+void ucx_list_free(UcxList *list);
+
+/**
+ * Destroys the entire list using a UcxAllocator.
+ * 
+ * See ucx_list_free() for details.
+ * 
+ * @param allocator the allocator to use
+ * @param list the list to free
+ * @see ucx_list_free()
+ */
+void ucx_list_free_a(UcxAllocator *allocator, UcxList *list);
+
+/**
+ * Destroys the contents of the specified list by calling the specified
+ * destructor on each of them.
+ * 
+ * Note, that the contents are not usable afterwards and the list should be
+ * destroyed with ucx_list_free().
+ *
+ * If no destructor is specified (<code>NULL</code>), stdlib's free() is used.
+ * 
+ * @param list the list for which the contents shall be freed
+ * @param destr optional destructor function
+ * @see ucx_list_free()
+ */
+void ucx_list_free_content(UcxList* list, ucx_destructor destr);
+
+
+/**
+ * Inserts an element at the end of the list.
+ * 
+ * This is generally an O(n) operation, as the end of the list is retrieved with
+ * ucx_list_last().
+ * 
+ * @param list the list where to append the data, or <code>NULL</code> to
+ * create a new list
+ * @param data the data to insert
+ * @return <code>list</code>, if it is not <code>NULL</code> or a pointer to
+ * the newly created list otherwise
+ */
+UcxList *ucx_list_append(UcxList *list, void *data);
+
+/**
+ * Inserts an element at the end of the list using a UcxAllocator.
+ * 
+ * See ucx_list_append() for details.
+ * 
+ * @param allocator the allocator to use
+ * @param list the list where to append the data, or <code>NULL</code> to
+ * create a new list
+ * @param data the data to insert
+ * @return <code>list</code>, if it is not <code>NULL</code> or a pointer to
+ * the newly created list otherwise
+ * @see ucx_list_append()
+ */
+UcxList *ucx_list_append_a(UcxAllocator *allocator, UcxList *list, void *data);
+
+
+/**
+ * Inserts an element at the beginning of the list.
+ * 
+ * You <i>should</i> overwrite the old list pointer by calling
+ * <code>mylist = ucx_list_prepend(mylist, mydata);</code>. However, you may
+ * also perform successive calls of ucx_list_prepend() on the same list pointer,
+ * as this function always searchs for the head of the list with
+ * ucx_list_first().
+ * 
+ * @param list the list where to insert the data or <code>NULL</code> to create
+ * a new list
+ * @param data the data to insert
+ * @return a pointer to the new list head
+ */
+UcxList *ucx_list_prepend(UcxList *list, void *data);
+
+/**
+ * Inserts an element at the beginning of the list using a UcxAllocator.
+ * 
+ * See ucx_list_prepend() for details.
+ * 
+ * @param allocator the allocator to use
+ * @param list the list where to insert the data or <code>NULL</code> to create
+ * a new list
+ * @param data the data to insert
+ * @return a pointer to the new list head
+ * @see ucx_list_prepend()
+ */
+UcxList *ucx_list_prepend_a(UcxAllocator *allocator, UcxList *list, void *data);
+
+/**
+ * Concatenates two lists.
+ * 
+ * Either of the two arguments may be <code>NULL</code>.
+ * 
+ * This function modifies the references to the next/previous element of
+ * the last/first element of <code>list1</code>/<code>
+ * list2</code>.
+ * 
+ * @param list1 first list
+ * @param list2 second list
+ * @return if <code>list1</code> is <code>NULL</code>, <code>list2</code> is
+ * returned, otherwise <code>list1</code> is returned
+ */
+UcxList *ucx_list_concat(UcxList *list1, UcxList *list2);
+
+/**
+ * Returns the first element of a list.
+ * 
+ * If the argument is the list pointer, it is directly returned. Otherwise
+ * this function traverses to the first element of the list and returns the
+ * list pointer.
+ * 
+ * @param elem one element of the list
+ * @return the first element of the list, the specified element is a member of
+ */
+UcxList *ucx_list_first(const UcxList *elem);
+
+/**
+ * Returns the last element of a list.
+ * 
+ * If the argument has no successor, it is the last element and therefore
+ * directly returned. Otherwise this function traverses to the last element of
+ * the list and returns it.
+ * 
+ * @param elem one element of the list
+ * @return the last element of the list, the specified element is a member of
+ */
+UcxList *ucx_list_last(const UcxList *elem);
+
+/**
+ * Returns the list element at the specified index.
+ * 
+ * @param list the list to retrieve the element from
+ * @param index index of the element to return
+ * @return the element at the specified index or <code>NULL</code>, if the
+ * index is greater than the list size
+ */
+UcxList *ucx_list_get(const UcxList *list, size_t index);
+
+/**
+ * Returns the index of an element.
+ * 
+ * @param list the list where to search for the element
+ * @param elem the element to find
+ * @return the index of the element or -1 if the list does not contain the
+ * element
+ */
+ssize_t ucx_list_indexof(const UcxList *list, const UcxList *elem);
+
+/**
+ * Returns the element count of the list.
+ * 
+ * @param list the list whose elements are counted
+ * @return the element count
+ */
+size_t ucx_list_size(const UcxList *list);
+
+/**
+ * Returns the index of an element containing the specified data.
+ *
+ * This function uses a cmp_func() to compare the data of each list element
+ * with the specified data. If no cmp_func is provided, the pointers are
+ * compared.
+ * 
+ * If the list contains the data more than once, the index of the first
+ * occurrence is returned.
+ *  
+ * @param list the list where to search for the data
+ * @param elem the element data
+ * @param cmpfnc the compare function
+ * @param data additional data for the compare function
+ * @return the index of the element containing the specified data or -1 if the
+ * data is not found in this list
+ */
+ssize_t ucx_list_find(const UcxList *list, void *elem,
+    cmp_func cmpfnc, void *data);
+
+/**
+ * Checks, if a list contains a specific element.
+ * 
+ * An element is found, if ucx_list_find() returns a value greater than -1.
+ * 
+ * @param list the list where to search for the data
+ * @param elem the element data
+ * @param cmpfnc the compare function
+ * @param data additional data for the compare function
+ * @return 1, if and only if the list contains the specified element data
+ * @see ucx_list_find()
+ */
+int ucx_list_contains(const UcxList *list, void *elem,
+    cmp_func cmpfnc, void *data);
+
+/**
+ * Sorts a UcxList with natural merge sort.
+ * 
+ * This function uses O(n) additional temporary memory for merge operations
+ * that is automatically freed after each merge.
+ * 
+ * As the head of the list might change, you <b>MUST</b> call this function
+ * as follows: <code>mylist = ucx_list_sort(mylist, mycmpfnc, mydata);</code>.
+ * 
+ * @param list the list to sort
+ * @param cmpfnc the function that shall be used to compare the element data
+ * @param data additional data for the cmp_func()
+ * @return the sorted list
+ */
+UcxList *ucx_list_sort(UcxList *list, cmp_func cmpfnc, void *data);
+
+/**
+ * Removes an element from the list.
+ * 
+ * If the first element is removed, the list pointer changes. So it is
+ * <i>highly recommended</i> to <i>always</i> update the pointer by calling
+ * <code>mylist = ucx_list_remove(mylist, myelem);</code>.
+ * 
+ * @param list the list from which the element shall be removed
+ * @param element the element to remove
+ * @return returns the updated list pointer or <code>NULL</code>, if the list
+ * is now empty
+ */
+UcxList *ucx_list_remove(UcxList *list, UcxList *element);
+
+/**
+ * Removes an element from the list using a UcxAllocator.
+ * 
+ * See ucx_list_remove() for details.
+ * 
+ * @param allocator the allocator to use
+ * @param list the list from which the element shall be removed
+ * @param element the element to remove
+ * @return returns the updated list pointer or <code>NULL</code>, if the list
+ * @see ucx_list_remove()
+ */
+UcxList *ucx_list_remove_a(UcxAllocator *allocator, UcxList *list,
+        UcxList *element);
+
+/**
+ * Returns the union of two lists.
+ * 
+ * The union is a list of unique elements regarding cmpfnc obtained from
+ * both source lists.
+ * 
+ * @param left the left source list
+ * @param right the right source list
+ * @param cmpfnc a function to compare elements
+ * @param cmpdata additional data for the compare function
+ * @param cpfnc a function to copy the elements
+ * @param cpdata additional data for the copy function
+ * @return a new list containing the union
+ */
+UcxList* ucx_list_union(const UcxList *left, const UcxList *right,
+    cmp_func cmpfnc, void* cmpdata,
+    copy_func cpfnc, void* cpdata);
+
+/**
+ * Returns the union of two lists.
+ * 
+ * The union is a list of unique elements regarding cmpfnc obtained from
+ * both source lists.
+ * 
+ * @param allocator allocates the new list elements
+ * @param left the left source list
+ * @param right the right source list
+ * @param cmpfnc a function to compare elements
+ * @param cmpdata additional data for the compare function
+ * @param cpfnc a function to copy the elements
+ * @param cpdata additional data for the copy function
+ * @return a new list containing the union
+ */
+UcxList* ucx_list_union_a(UcxAllocator *allocator,
+    const UcxList *left, const UcxList *right,
+    cmp_func cmpfnc, void* cmpdata,
+    copy_func cpfnc, void* cpdata);
+
+/**
+ * Returns the intersection of two lists.
+ * 
+ * The intersection contains all elements of the left list
+ * (including duplicates) that can be found in the right list.
+ * 
+ * @param left the left source list
+ * @param right the right source list
+ * @param cmpfnc a function to compare elements
+ * @param cmpdata additional data for the compare function
+ * @param cpfnc a function to copy the elements
+ * @param cpdata additional data for the copy function
+ * @return a new list containing the intersection
+ */
+UcxList* ucx_list_intersection(const UcxList *left, const UcxList *right,
+    cmp_func cmpfnc, void* cmpdata,
+    copy_func cpfnc, void* cpdata);
+
+/**
+ * Returns the intersection of two lists.
+ * 
+ * The intersection contains all elements of the left list
+ * (including duplicates) that can be found in the right list.
+ * 
+ * @param allocator allocates the new list elements
+ * @param left the left source list
+ * @param right the right source list
+ * @param cmpfnc a function to compare elements
+ * @param cmpdata additional data for the compare function
+ * @param cpfnc a function to copy the elements
+ * @param cpdata additional data for the copy function
+ * @return a new list containing the intersection
+ */
+UcxList* ucx_list_intersection_a(UcxAllocator *allocator,
+    const UcxList *left, const UcxList *right,
+    cmp_func cmpfnc, void* cmpdata,
+    copy_func cpfnc, void* cpdata);
+
+/**
+ * Returns the difference of two lists.
+ * 
+ * The difference contains all elements of the left list
+ * (including duplicates) that are not equal to any element of the right list.
+ * 
+ * @param left the left source list
+ * @param right the right source list
+ * @param cmpfnc a function to compare elements
+ * @param cmpdata additional data for the compare function
+ * @param cpfnc a function to copy the elements
+ * @param cpdata additional data for the copy function
+ * @return a new list containing the difference
+ */
+UcxList* ucx_list_difference(const UcxList *left, const UcxList *right,
+    cmp_func cmpfnc, void* cmpdata,
+    copy_func cpfnc, void* cpdata);
+
+/**
+ * Returns the difference of two lists.
+ * 
+ * The difference contains all elements of the left list
+ * (including duplicates) that are not equal to any element of the right list.
+ * 
+ * @param allocator allocates the new list elements
+ * @param left the left source list
+ * @param right the right source list
+ * @param cmpfnc a function to compare elements
+ * @param cmpdata additional data for the compare function
+ * @param cpfnc a function to copy the elements
+ * @param cpdata additional data for the copy function
+ * @return a new list containing the difference
+ */
+UcxList* ucx_list_difference_a(UcxAllocator *allocator,
+    const UcxList *left, const UcxList *right,
+    cmp_func cmpfnc, void* cmpdata,
+    copy_func cpfnc, void* cpdata);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_LIST_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/logging.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,253 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * Logging API.
+ * 
+ * @file   logging.h
+ * @author Mike Becker, Olaf Wintermann
+ */
+#ifndef UCX_LOGGING_H
+#define UCX_LOGGING_H
+
+#include "ucx.h"
+#include "map.h"
+#include "string.h"
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* leave enough space for custom log levels */
+
+/** Log level for error messages. */
+#define UCX_LOGGER_ERROR        0x00
+    
+/** Log level for warning messages. */
+#define UCX_LOGGER_WARN         0x10
+
+/** Log level for information messages. */
+#define UCX_LOGGER_INFO         0x20
+
+/** Log level for debug messages. */
+#define UCX_LOGGER_DEBUG        0x30
+
+/** Log level for trace messages. */
+#define UCX_LOGGER_TRACE        0x40
+
+/**
+ * Output flag for the log level. 
+ * If this flag is set, the log message will contain the log level.
+ * @see UcxLogger.mask
+ */
+#define UCX_LOGGER_LEVEL        0x01
+
+/**
+ * Output flag for the timestmap.
+ * If this flag is set, the log message will contain the timestmap.
+ * @see UcxLogger.mask
+ */
+#define UCX_LOGGER_TIMESTAMP    0x02
+
+/**
+ * Output flag for the source.
+ * If this flag is set, the log message will contain the source file and line
+ * number.
+ * @see UcxLogger.mask
+ */
+#define UCX_LOGGER_SOURCE       0x04
+
+/**
+ * The UCX Logger object.
+ */
+typedef struct {
+    /** The stream this logger writes its messages to.*/
+    void *stream;
+
+    /**
+     * The write function that shall be used.
+     * For standard file or stdout loggers this might be standard fwrite
+     * (default).
+     */
+    write_func writer;
+
+    /**
+     * The date format for timestamp outputs including the delimiter
+     * (default: <code>"%F %T %z "</code>).
+     * @see UCX_LOGGER_TIMESTAMP
+     */
+    char *dateformat;
+
+    /**
+     * The level, this logger operates on.
+     * If a log command is issued, the message will only be logged, if the log
+     * level of the message is less or equal than the log level of the logger.
+     */
+    unsigned int level;
+
+    /**
+     * A configuration mask for automatic output. 
+     * For each flag that is set, the logger automatically outputs some extra
+     * information like the timestamp or the source file and line number.
+     * See the documentation for the flags for details.
+     */
+    unsigned int mask;
+
+    /**
+     * A map of valid log levels for this logger.
+     * 
+     * The keys represent all valid log levels and the values provide string
+     * representations, that are used, if the UCX_LOGGER_LEVEL flag is set.
+     * 
+     * The exact data types are <code>unsigned int</code> for the key and
+     * <code>const char*</code> for the value.
+     * 
+     * @see UCX_LOGGER_LEVEL
+     */
+    UcxMap* levels;
+} UcxLogger;
+
+/**
+ * Creates a new logger.
+ * @param stream the stream, which the logger shall write to
+ * @param level the level on which the logger shall operate
+ * @param mask configuration mask (cf. UcxLogger.mask)
+ * @return a new logger object
+ */
+UcxLogger *ucx_logger_new(void *stream, unsigned int level, unsigned int mask);
+
+/**
+ * Destroys the logger.
+ * 
+ * The map containing the valid log levels is also automatically destroyed.
+ * 
+ * @param logger the logger to destroy
+ */
+void ucx_logger_free(UcxLogger* logger);
+
+/**
+ * Internal log function - use macros instead.
+ * 
+ * This function uses the <code>format</code> and variadic arguments for a
+ * printf()-style output of the log message.
+ * 
+ * Dependent on the UcxLogger.mask some information is prepended. The complete
+ * format is:
+ * 
+ * <code>[LEVEL] [TIMESTAMP] [SOURCEFILE]:[LINENO] message</code>
+ *
+ * The source file name is reduced to the actual file name. This is necessary to
+ * get consistent behavior over different definitions of the __FILE__ macro.
+ *
+ * <b>Attention:</b> the message (including automatically generated information)
+ * is limited to 4096 characters. The level description is limited to
+ * 256 characters and the timestamp string is limited to 128 characters.
+ * 
+ * @param logger the logger to use
+ * @param level the level to log on
+ * @param file information about the source file
+ * @param line information about the source line number
+ * @param format format string
+ * @param ... arguments
+ * @see ucx_logger_log()
+ */
+void ucx_logger_logf(UcxLogger *logger, unsigned int level, const char* file,
+        const unsigned int line, const char* format, ...);
+
+/**
+ * Registers a custom log level.
+ * @param logger the logger
+ * @param level the log level as unsigned integer
+ * @param name a string literal describing the level
+ */
+#define ucx_logger_register_level(logger, level, name) {\
+        unsigned int l; \
+            l = level; \
+            ucx_map_int_put(logger->levels, l, (void*) "[" name "]"); \
+        } while (0);
+
+/**
+ * Logs a message at the specified level.
+ * @param logger the logger to use
+ * @param level the level to log the message on
+ * @param ... format string and arguments
+ * @see ucx_logger_logf()
+ */
+#define ucx_logger_log(logger, level, ...) \
+    ucx_logger_logf(logger, level, __FILE__, __LINE__, __VA_ARGS__)
+
+/**
+ * Shortcut for logging an error message.
+ * @param logger the logger to use
+ * @param ... format string and arguments
+ * @see ucx_logger_logf()
+ */
+#define ucx_logger_error(logger, ...) \
+    ucx_logger_log(logger, UCX_LOGGER_ERROR, __VA_ARGS__)
+
+/**
+ * Shortcut for logging an information message.
+ * @param logger the logger to use
+ * @param ... format string and arguments
+ * @see ucx_logger_logf()
+ */
+#define ucx_logger_info(logger, ...) \
+    ucx_logger_log(logger, UCX_LOGGER_INFO, __VA_ARGS__)
+
+/**
+ * Shortcut for logging a warning message.
+ * @param logger the logger to use
+ * @param ... format string and arguments
+ * @see ucx_logger_logf()
+ */
+#define ucx_logger_warn(logger, ...) \
+    ucx_logger_log(logger, UCX_LOGGER_WARN, __VA_ARGS__)
+
+/**
+ * Shortcut for logging a debug message.
+ * @param logger the logger to use
+ * @param ... format string and arguments
+ * @see ucx_logger_logf()
+ */
+#define ucx_logger_debug(logger, ...) \
+    ucx_logger_log(logger, UCX_LOGGER_DEBUG, __VA_ARGS__)
+
+/**
+ * Shortcut for logging a trace message.
+ * @param logger the logger to use
+ * @param ... format string and arguments
+ * @see ucx_logger_logf()
+ */
+#define ucx_logger_trace(logger, ...) \
+    ucx_logger_log(logger, UCX_LOGGER_TRACE, __VA_ARGS__)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UCX_LOGGING_H */
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/map.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,549 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @file map.h
+ * 
+ * Hash map implementation.
+ * 
+ * This implementation uses murmur hash 2 and separate chaining with linked
+ * lists.
+ * 
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_MAP_H
+#define	UCX_MAP_H
+
+#include "ucx.h"
+#include "string.h"
+#include "allocator.h"
+#include <stdio.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/**
+ * Loop statement for UCX maps.
+ * 
+ * The <code>key</code> variable is implicitly defined, but the
+ * <code>value</code> variable must be already declared as type information
+ * cannot be inferred.
+ * 
+ * @param key the variable name for the key
+ * @param value the variable name for the value
+ * @param iter a UcxMapIterator
+ * @see ucx_map_iterator()
+ */
+#define UCX_MAP_FOREACH(key,value,iter) \
+        for(UcxKey key;ucx_map_iter_next(&iter,&key, (void**)&value);)
+
+/** Type for the UCX map. @see UcxMap */
+typedef struct UcxMap          UcxMap;
+
+/** Type for a key of a UcxMap. @see UcxKey */
+typedef struct UcxKey          UcxKey;
+
+/** Type for an element of a UcxMap. @see UcxMapElement */
+typedef struct UcxMapElement   UcxMapElement;
+
+/** Type for an iterator over a UcxMap. @see UcxMapIterator */
+typedef struct UcxMapIterator  UcxMapIterator;
+
+/** Structure for the UCX map. */
+struct UcxMap {
+    /** An allocator that is used for the map elements. */
+    UcxAllocator  *allocator;
+    /** The array of map element lists. */
+    UcxMapElement **map;
+    /** The size of the map is the length of the element list array. */
+    size_t        size;
+    /** The count of elements currently stored in this map. */
+    size_t        count;
+};
+
+/** Structure to publicly denote a key of a UcxMap. */
+struct UcxKey {
+    /** The key data. */
+    const void *data;
+    /** The length of the key data. */
+    size_t     len;
+    /** A cache for the hash value of the key data. */
+    int        hash;
+};
+
+/** Internal structure for a key of a UcxMap. */
+struct UcxMapKey {
+    /** The key data. */
+    void    *data;
+    /** The length of the key data. */
+    size_t  len;
+    /** The hash value of the key data. */
+    int     hash;
+};
+
+/** Structure for an element of a UcxMap. */
+struct UcxMapElement {
+    /** The value data. */
+    void              *data;
+    
+    /** A pointer to the next element in the current list. */
+    UcxMapElement     *next;
+    
+    /** The corresponding key. */
+    struct UcxMapKey  key;
+};
+
+/** Structure for an iterator over a UcxMap. */
+struct UcxMapIterator {
+    /** The map to iterate over. */
+    UcxMap const  *map;
+    
+    /** The current map element. */
+    UcxMapElement *cur;
+    
+    /**
+     * The current index of the element list array.
+     * <b>Attention: </b> this is <b>NOT</b> the element index! Do <b>NOT</b>
+     * manually iterate over the map by increasing this index. Use
+     * ucx_map_iter_next().
+     * @see UcxMap.map*/
+    size_t        index;
+};
+
+/**
+ * Creates a new hash map with the specified size.
+ * @param size the size of the hash map
+ * @return a pointer to the new hash map
+ */
+UcxMap *ucx_map_new(size_t size);
+
+/**
+ * Creates a new hash map with the specified size using a UcxAllocator.
+ * @param allocator the allocator to use
+ * @param size the size of the hash map
+ * @return a pointer to the new hash map
+ */
+UcxMap *ucx_map_new_a(UcxAllocator *allocator, size_t size);
+
+/**
+ * Frees a hash map.
+ * 
+ * <b>Note:</b> the contents are <b>not</b> freed, use ucx_map_free_content()
+ * before calling this function to achieve that.
+ * 
+ * @param map the map to be freed
+ * @see ucx_map_free_content()
+ */
+void ucx_map_free(UcxMap *map);
+
+/**
+ * Frees the contents of a hash map.
+ * 
+ * This is a convenience function that iterates over the map and passes all
+ * values to the specified destructor function.
+ * 
+ * If no destructor is specified (<code>NULL</code>), the free() function of
+ * the map's own allocator is used.
+ * 
+ * You must ensure, that it is valid to pass each value in the map to the same
+ * destructor function.
+ * 
+ * You should free or clear the map afterwards, as the contents will be invalid.
+ * 
+ * @param map for which the contents shall be freed
+ * @param destr optional pointer to a destructor function
+ * @see ucx_map_free()
+ * @see ucx_map_clear()
+ */
+void ucx_map_free_content(UcxMap *map, ucx_destructor destr);
+
+/**
+ * Clears a hash map.
+ * 
+ * <b>Note:</b> the contents are <b>not</b> freed, use ucx_map_free_content()
+ * before calling this function to achieve that.
+ * 
+ * @param map the map to be cleared
+ * @see ucx_map_free_content()
+ */
+void ucx_map_clear(UcxMap *map);
+
+
+/**
+ * Copies contents from a map to another map using a copy function.
+ * 
+ * <b>Note:</b> The destination map does not need to be empty. However, if it
+ * contains data with keys that are also present in the source map, the contents
+ * are overwritten.
+ * 
+ * @param from the source map
+ * @param to the destination map
+ * @param fnc the copy function or <code>NULL</code> if the pointer address
+ * shall be copied
+ * @param data additional data for the copy function
+ * @return 0 on success or a non-zero value on memory allocation errors
+ */
+int ucx_map_copy(UcxMap const *from, UcxMap *to, copy_func fnc, void *data);
+
+/**
+ * Clones the map and rehashes if necessary.
+ * 
+ * <b>Note:</b> In contrast to ucx_map_rehash() the load factor is irrelevant.
+ * This function <i>always</i> ensures a new UcxMap.size of at least
+ * 2.5*UcxMap.count.
+ * 
+ * @param map the map to clone
+ * @param fnc the copy function to use or <code>NULL</code> if the new and
+ * the old map shall share the data pointers
+ * @param data additional data for the copy function
+ * @return the cloned map
+ * @see ucx_map_copy()
+ */
+UcxMap *ucx_map_clone(UcxMap const *map, copy_func fnc, void *data);
+
+/**
+ * Clones the map and rehashes if necessary.
+ *
+ * <b>Note:</b> In contrast to ucx_map_rehash() the load factor is irrelevant.
+ * This function <i>always</i> ensures a new UcxMap.size of at least
+ * 2.5*UcxMap.count.
+ *
+ * @param allocator the allocator to use for the cloned map
+ * @param map the map to clone
+ * @param fnc the copy function to use or <code>NULL</code> if the new and
+ * the old map shall share the data pointers
+ * @param data additional data for the copy function
+ * @return the cloned map
+ * @see ucx_map_copy()
+ */
+UcxMap *ucx_map_clone_a(UcxAllocator *allocator,
+                        UcxMap const *map, copy_func fnc, void *data);
+
+/**
+ * Increases size of the hash map, if necessary.
+ * 
+ * The load value is 0.75*UcxMap.size. If the element count exceeds the load
+ * value, the map needs to be rehashed. Otherwise no action is performed and
+ * this function simply returns 0.
+ * 
+ * The rehashing process ensures, that the UcxMap.size is at least
+ * 2.5*UcxMap.count. So there is enough room for additional elements without
+ * the need of another soon rehashing.
+ * 
+ * You can use this function to dramatically increase access performance.
+ * 
+ * @param map the map to rehash
+ * @return 1, if a memory allocation error occurred, 0 otherwise
+ */
+int ucx_map_rehash(UcxMap *map);
+
+/**
+ * Puts a key/value-pair into the map.
+ * 
+ * @param map the map
+ * @param key the key
+ * @param value the value
+ * @return 0 on success, non-zero value on failure
+ */
+int ucx_map_put(UcxMap *map, UcxKey key, void *value);
+
+/**
+ * Retrieves a value by using a key.
+ * 
+ * @param map the map
+ * @param key the key
+ * @return the value
+ */
+void* ucx_map_get(UcxMap const *map, UcxKey key);
+
+/**
+ * Removes a key/value-pair from the map by using the key.
+ * 
+ * @param map the map
+ * @param key the key
+ * @return the removed value
+ */
+void* ucx_map_remove(UcxMap *map, UcxKey key);
+
+/**
+ * Shorthand for putting data with a sstr_t key into the map.
+ * @param map the map
+ * @param key the key
+ * @param value the value
+ * @return 0 on success, non-zero value on failure
+ * @see ucx_map_put()
+ */
+#define ucx_map_sstr_put(map, key, value) \
+    ucx_map_put(map, ucx_key(key.ptr, key.length), (void*)value)
+
+/**
+ * Shorthand for putting data with a C string key into the map.
+ * @param map the map
+ * @param key the key
+ * @param value the value
+ * @return 0 on success, non-zero value on failure
+ * @see ucx_map_put()
+ */
+#define ucx_map_cstr_put(map, key, value) \
+    ucx_map_put(map, ucx_key(key, strlen(key)), (void*)value)
+
+/**
+ * Shorthand for putting data with an integer key into the map.
+ * @param map the map
+ * @param key the key
+ * @param value the value
+ * @return 0 on success, non-zero value on failure
+ * @see ucx_map_put()
+ */
+#define ucx_map_int_put(map, key, value) \
+    ucx_map_put(map, ucx_key(&key, sizeof(key)), (void*)value)
+
+/**
+ * Shorthand for getting data from the map with a sstr_t key.
+ * @param map the map
+ * @param key the key
+ * @return the value
+ * @see ucx_map_get()
+ */
+#define ucx_map_sstr_get(map, key) \
+    ucx_map_get(map, ucx_key(key.ptr, key.length))
+
+/**
+ * Shorthand for getting data from the map with a C string key.
+ * @param map the map
+ * @param key the key
+ * @return the value
+ * @see ucx_map_get()
+ */
+#define ucx_map_cstr_get(map, key) \
+    ucx_map_get(map, ucx_key(key, strlen(key)))
+
+/**
+ * Shorthand for getting data from the map with an integer key.
+ * @param map the map
+ * @param key the key
+ * @return the value
+ * @see ucx_map_get()
+ */
+#define ucx_map_int_get(map, key) \
+    ucx_map_get(map, ucx_key(&key, sizeof(int)))
+
+/**
+ * Shorthand for removing data from the map with a sstr_t key.
+ * @param map the map
+ * @param key the key
+ * @return the removed value
+ * @see ucx_map_remove()
+ */
+#define ucx_map_sstr_remove(map, key) \
+    ucx_map_remove(map, ucx_key(key.ptr, key.length))
+
+/**
+ * Shorthand for removing data from the map with a C string key.
+ * @param map the map
+ * @param key the key
+ * @return the removed value
+ * @see ucx_map_remove()
+ */
+#define ucx_map_cstr_remove(map, key) \
+    ucx_map_remove(map, ucx_key(key, strlen(key)))
+
+/**
+ * Shorthand for removing data from the map with an integer key.
+ * @param map the map
+ * @param key the key
+ * @return the removed value
+ * @see ucx_map_remove()
+ */
+#define ucx_map_int_remove(map, key) \
+    ucx_map_remove(map, ucx_key(&key, sizeof(key)))
+
+/**
+ * Creates a UcxKey based on the given data.
+ * 
+ * This function implicitly computes the hash.
+ * 
+ * @param data the data for the key
+ * @param len the length of the data
+ * @return a UcxKey with implicitly computed hash
+ * @see ucx_hash()
+ */
+UcxKey ucx_key(const void *data, size_t len);
+
+/**
+ * Computes a murmur hash-2.
+ * 
+ * @param data the data to hash
+ * @param len the length of the data
+ * @return the murmur hash-2 of the data
+ */
+int ucx_hash(const char *data, size_t len);
+
+/**
+ * Creates an iterator for a map.
+ * 
+ * <b>Note:</b> A UcxMapIterator iterates over all elements in all element
+ * lists successively. Therefore the order highly depends on the key hashes and
+ * may vary under different map sizes. So generally you may <b>NOT</b> rely on
+ * the iteration order.
+ * 
+ * <b>Note:</b> The iterator is <b>NOT</b> initialized. You need to call
+ * ucx_map_iter_next() at least once before accessing any information. However,
+ * it is not recommended to access the fields of a UcxMapIterator directly.
+ * 
+ * @param map the map to create the iterator for
+ * @return an iterator initialized on the first element of the
+ * first element list
+ * @see ucx_map_iter_next()
+ */
+UcxMapIterator ucx_map_iterator(UcxMap const *map);
+
+/**
+ * Proceeds to the next element of the map (if any).
+ * 
+ * Subsequent calls on the same iterator proceed to the next element and
+ * store the key/value-pair into the memory specified as arguments of this
+ * function.
+ * 
+ * If no further elements are found, this function returns zero and leaves the
+ * last found key/value-pair in memory.
+ * 
+ * @param iterator the iterator to use
+ * @param key a pointer to the memory where to store the key
+ * @param value a pointer to the memory where to store the value
+ * @return 1, if another element was found, 0 if all elements has been processed
+ * @see ucx_map_iterator()
+ */
+int ucx_map_iter_next(UcxMapIterator *iterator, UcxKey *key, void **value);
+
+/**
+ * Returns the union of two maps.
+ *
+ * The union is a fresh map which is filled by two successive calls of
+ * ucx_map_copy() on the two input maps.
+ *
+ * @param first the first source map
+ * @param second the second source map
+ * @param cpfnc a function to copy the elements
+ * @param cpdata additional data for the copy function
+ * @return a new map containing the union
+ */
+UcxMap* ucx_map_union(const UcxMap *first, const UcxMap *second,
+                      copy_func cpfnc, void* cpdata);
+
+/**
+ * Returns the union of two maps.
+ *
+ * The union is a fresh map which is filled by two successive calls of
+ * ucx_map_copy() on the two input maps.
+ *
+ * @param allocator the allocator that shall be used by the new map
+ * @param first the first source map
+ * @param second the second source map
+ * @param cpfnc a function to copy the elements
+ * @param cpdata additional data for the copy function
+ * @return a new map containing the union
+ */
+UcxMap* ucx_map_union_a(UcxAllocator *allocator,
+                        const UcxMap *first, const UcxMap *second,
+                        copy_func cpfnc, void* cpdata);
+
+/**
+ * Returns the intersection of two maps.
+ *
+ * The intersection is defined as a copy of the first map with every element
+ * removed that has no valid key in the second map.
+ *
+ * @param first the first source map
+ * @param second the second source map
+ * @param cpfnc a function to copy the elements
+ * @param cpdata additional data for the copy function
+ * @return a new map containing the intersection
+ */
+UcxMap* ucx_map_intersection(const UcxMap *first, const UcxMap *second,
+                             copy_func cpfnc, void* cpdata);
+
+/**
+ * Returns the intersection of two maps.
+ *
+ * The intersection is defined as a copy of the first map with every element
+ * removed that has no valid key in the second map.
+ *
+ * @param allocator the allocator that shall be used by the new map
+ * @param first the first source map
+ * @param second the second source map
+ * @param cpfnc a function to copy the elements
+ * @param cpdata additional data for the copy function
+ * @return a new map containing the intersection
+ */
+UcxMap* ucx_map_intersection_a(UcxAllocator *allocator,
+                               const UcxMap *first, const UcxMap *second,
+                               copy_func cpfnc, void* cpdata);
+
+/**
+ * Returns the difference of two maps.
+ *
+ * The difference contains a copy of all elements of the first map
+ * for which the corresponding keys cannot be found in the second map.
+ *
+ * @param first the first source map
+ * @param second the second source map
+ * @param cpfnc a function to copy the elements
+ * @param cpdata additional data for the copy function
+ * @return a new list containing the difference
+ */
+UcxMap* ucx_map_difference(const UcxMap *first, const UcxMap *second,
+                           copy_func cpfnc, void* cpdata);
+
+/**
+ * Returns the difference of two maps.
+ *
+ * The difference contains a copy of all elements of the first map
+ * for which the corresponding keys cannot be found in the second map.
+ *
+ * @param allocator the allocator that shall be used by the new map
+ * @param first the first source map
+ * @param second the second source map
+ * @param cpfnc a function to copy the elements
+ * @param cpdata additional data for the copy function
+ * @return a new list containing the difference
+ */
+UcxMap* ucx_map_difference_a(UcxAllocator *allocator,
+                             const UcxMap *first, const UcxMap *second,
+                             copy_func cpfnc, void* cpdata);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_MAP_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/mempool.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,209 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @file mempool.h
+ * 
+ * Memory pool implementation.
+ * 
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_MEMPOOL_H
+#define	UCX_MEMPOOL_H
+
+#include "ucx.h"
+#include "allocator.h"
+#include <stddef.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/**
+ * UCX mempool structure.
+ */
+typedef struct {
+    /** UcxAllocator based on this pool */
+    UcxAllocator *allocator;
+    
+    /** List of pointers to pooled memory. */
+    void         **data;
+    
+    /** Count of pooled memory items. */
+    size_t       ndata;
+    
+    /** Memory pool size. */
+    size_t       size;
+} UcxMempool;
+
+/** Shorthand for a new default memory pool with a capacity of 16 elements. */
+#define ucx_mempool_new_default() ucx_mempool_new(16)
+
+
+/**
+ * Creates a memory pool with the specified initial size.
+ * 
+ * As the created memory pool automatically grows in size by factor two when
+ * trying to allocate memory on a full pool, it is recommended that you use
+ * a power of two for the initial size.
+ * 
+ * @param n initial pool size (should be a power of two, e.g. 16)
+ * @return a pointer to the new memory pool
+ * @see ucx_mempool_new_default()
+ */
+UcxMempool *ucx_mempool_new(size_t n);
+
+/**
+ * Resizes a memory pool.
+ * 
+ * This function will fail if the new capacity is not sufficient for the
+ * present data.
+ * 
+ * @param pool the pool to resize
+ * @param newcap the new capacity
+ * @return zero on success or non-zero on failure
+ */
+int ucx_mempool_chcap(UcxMempool *pool, size_t newcap);
+
+/**
+ * Allocates pooled memory.
+ * 
+ * @param pool the memory pool
+ * @param n amount of memory to allocate
+ * @return a pointer to the allocated memory
+ * @see ucx_allocator_malloc()
+ */
+void *ucx_mempool_malloc(UcxMempool *pool, size_t n);
+/**
+ * Allocates a pooled memory array.
+ * 
+ * The content of the allocated memory is set to zero.
+ * 
+ * @param pool the memory pool
+ * @param nelem amount of elements to allocate
+ * @param elsize amount of memory per element
+ * @return a pointer to the allocated memory
+ * @see ucx_allocator_calloc()
+ */
+void *ucx_mempool_calloc(UcxMempool *pool, size_t nelem, size_t elsize);
+
+/**
+ * Reallocates pooled memory.
+ * 
+ * If the memory to be reallocated is not contained by the specified pool, the
+ * behavior is undefined.
+ * 
+ * @param pool the memory pool
+ * @param ptr a pointer to the memory that shall be reallocated
+ * @param n the new size of the memory
+ * @return a pointer to the new location of the memory
+ * @see ucx_allocator_realloc()
+ */
+void *ucx_mempool_realloc(UcxMempool *pool, void *ptr, size_t n);
+
+/**
+ * Frees pooled memory.
+ * 
+ * Before freeing the memory, the specified destructor function (if any)
+ * is called.
+ * 
+ * If you specify memory, that is not pooled by the specified memory pool, the
+ * program will terminate with a call to <code>abort()</code>.
+ * 
+ * @param pool the memory pool
+ * @param ptr a pointer to the memory that shall be freed
+ * @see ucx_mempool_set_destr()
+ */
+void ucx_mempool_free(UcxMempool *pool, void *ptr);
+
+/**
+ * Destroys a memory pool.
+ * 
+ * For each element the destructor function (if any) is called and the element
+ * is freed.
+ * 
+ * Each of the registered destructor function that has no corresponding element
+ * within the pool (namely those registered by ucx_mempool_reg_destr) is
+ * called interleaving with the element destruction, but with guarantee to the
+ * order in which they were registered (FIFO order).
+ * 
+ * 
+ * @param pool the mempool to destroy
+ */
+void ucx_mempool_destroy(UcxMempool *pool);
+
+/**
+ * Sets a destructor function for the specified memory.
+ * 
+ * The destructor is automatically called when the memory is freed or the
+ * pool is destroyed.
+ * A destructor for pooled memory <b>MUST NOT</b> free the memory itself,
+ * as this is done by the pool. Use a destructor to free any resources
+ * managed by the pooled object.
+ * 
+ * The only requirement for the specified memory is, that it <b>MUST</b> be
+ * pooled memory by a UcxMempool or an element-compatible mempool. The pointer
+ * to the destructor function is saved in a reserved area before the actual
+ * memory.
+ * 
+ * @param ptr pooled memory
+ * @param func a pointer to the destructor function
+ * @see ucx_mempool_free()
+ * @see ucx_mempool_destroy()
+ */
+void ucx_mempool_set_destr(void *ptr, ucx_destructor func);
+
+/**
+ * Registers a destructor function for the specified (non-pooled) memory.
+ *
+ * This is useful, if you have memory that has not been allocated by a mempool,
+ * but shall be managed by a mempool.
+ * 
+ * This function creates an entry in the specified mempool and the memory will
+ * therefore (logically) convert to pooled memory.
+ * <b>However, this does not cause the memory to be freed automatically!</b>.
+ * If you want to use this function, make the memory pool free non-pooled
+ * memory, the specified destructor function must call <code>free()</code>
+ * by itself. But keep in mind, that you then MUST NOT use this destructor
+ * function with pooled memory (e.g. in ucx_mempool_set_destr()), as it
+ * would cause a double-free.
+ * 
+ * @param pool the memory pool
+ * @param ptr data the destructor is registered for
+ * @param destr a pointer to the destructor function
+ */
+void ucx_mempool_reg_destr(UcxMempool *pool, void *ptr, ucx_destructor destr);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_MEMPOOL_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/properties.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,221 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * @file properties.h
+ * 
+ * Load / store utilities for properties files.
+ * 
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_PROPERTIES_H
+#define	UCX_PROPERTIES_H
+
+#include "ucx.h"
+#include "map.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/**
+ * UcxProperties object for parsing properties data.
+ * Most of the fields are for internal use only. You may configure the
+ * properties parser, e.g. by changing the used delimiter or specifying 
+ * up to three different characters that shall introduce comments.
+ */
+typedef struct {
+    /**
+     * Input buffer (don't set manually).
+     * Automatically set by calls to ucx_properties_fill().
+     */
+    char   *buffer;
+    
+    /**
+     * Length of the input buffer (don't set manually).
+     * Automatically set by calls to ucx_properties_fill().
+     */
+    size_t buflen;
+    
+    /**
+     * Current buffer position (don't set manually).
+     * Used by ucx_properties_next().
+     */
+    size_t pos;
+    
+    /**
+     * Internal temporary buffer (don't set manually).
+     * Used by ucx_properties_next().
+     */
+    char   *tmp;
+    
+    /**
+     * Internal temporary buffer length (don't set manually).
+     * Used by ucx_properties_next().
+     */
+    size_t tmplen;
+    
+    /**
+     * Internal temporary buffer capacity (don't set manually).
+     * Used by ucx_properties_next().
+     */
+    size_t tmpcap;
+    
+    /**
+     * Parser error code.
+     * This is always 0 on success and a nonzero value on syntax errors.
+     * The value is set by ucx_properties_next().
+     */
+    int    error;
+    
+    /**
+     * The delimiter that shall be used.
+     * This is '=' by default.
+     */
+    char   delimiter;
+    
+    /**
+     * The first comment character.
+     * This is '#' by default.
+     */
+    char   comment1;
+    
+    /**
+     * The second comment character.
+     * This is not set by default.
+     */
+    char   comment2;
+    
+    /**
+     * The third comment character.
+     * This is not set by default.
+     */
+    char   comment3;
+} UcxProperties;
+
+
+/**
+ * Constructs a new UcxProperties object.
+ * @return a pointer to the new UcxProperties object
+ */
+UcxProperties *ucx_properties_new();
+
+/**
+ * Destroys a UcxProperties object.
+ * @param prop the UcxProperties object to destroy
+ */
+void ucx_properties_free(UcxProperties *prop);
+
+/**
+ * Sets the input buffer for the properties parser.
+ * 
+ * After calling this function, you may parse the data by calling
+ * ucx_properties_next() until it returns 0. The function ucx_properties2map()
+ * is a convenience function that reads as much data as possible by using this
+ * function.
+ * 
+ * 
+ * @param prop the UcxProperties object
+ * @param buf a pointer to the new buffer
+ * @param len the payload length of the buffer
+ * @see ucx_properties_next()
+ * @see ucx_properties2map()
+ */
+void ucx_properties_fill(UcxProperties *prop, char *buf, size_t len);
+
+/**
+ * Retrieves the next key/value-pair.
+ * 
+ * This function returns a nonzero value as long as there are key/value-pairs
+ * found. If no more key/value-pairs are found, you may refill the input buffer
+ * with ucx_properties_fill().
+ * 
+ * <b>Attention:</b> the sstr_t.ptr pointers of the output parameters point to
+ * memory within the input buffer of the parser and will get invalid some time.
+ * If you want long term copies of the key/value-pairs, use sstrdup() after
+ * calling this function.
+ * 
+ * @param prop the UcxProperties object
+ * @param name a pointer to the sstr_t that shall contain the property name
+ * @param value a pointer to the sstr_t that shall contain the property value
+ * @return Nonzero, if a key/value-pair was successfully retrieved
+ * @see ucx_properties_fill()
+ */
+int ucx_properties_next(UcxProperties *prop, sstr_t *name, sstr_t *value);
+
+/**
+ * Retrieves all available key/value-pairs and puts them into a UcxMap.
+ * 
+ * This is done by successive calls to ucx_properties_next() until no more
+ * key/value-pairs can be retrieved.
+ * 
+ * The memory for the map values is allocated by the map's own allocator.
+ * 
+ * @param prop the UcxProperties object
+ * @param map the target map
+ * @return The UcxProperties.error code (i.e. 0 on success).
+ * @see ucx_properties_fill()
+ * @see UcxMap.allocator
+ */
+int ucx_properties2map(UcxProperties *prop, UcxMap *map);
+
+/**
+ * Loads a properties file to a UcxMap.
+ * 
+ * This is a convenience function that reads data from an input
+ * stream until the end of the stream is reached.
+ * 
+ * @param map the map object to write the key/value-pairs to
+ * @param file the <code>FILE*</code> stream to read from
+ * @return 0 on success, or a non-zero value on error
+ * 
+ * @see ucx_properties_fill()
+ * @see ucx_properties2map()
+ */
+int ucx_properties_load(UcxMap *map, FILE *file);
+
+/**
+ * Stores a UcxMap to a file.
+ * 
+ * The key/value-pairs are written by using the following format:
+ * 
+ * <code>[key] = [value]\\n</code>
+ * 
+ * @param map the map to store
+ * @param file the <code>FILE*</code> stream to write to
+ * @return 0 on success, or a non-zero value on error
+ */
+int ucx_properties_store(UcxMap *map, FILE *file);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_PROPERTIES_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/stack.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,240 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @file stack.h
+ * 
+ * Default stack memory allocation implementation.
+ * 
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_STACK_H
+#define	UCX_STACK_H
+
+#include "ucx.h"
+#include "allocator.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * UCX stack structure.
+ */
+typedef struct {
+    /** UcxAllocator based on this stack */
+    UcxAllocator allocator;
+    
+    /** Stack size. */
+    size_t size;
+    
+    /** Pointer to the bottom of the stack */
+    char *space;
+    
+    /** Pointer to the top of the stack */
+    char *top;
+} UcxStack;
+
+/**
+ * Metadata for each UCX stack element.
+ */
+struct ucx_stack_metadata {
+    /**
+     * Location of the previous element (<code>NULL</code> if this is the first)
+     */
+    char *prev;
+    
+    /** Size of this element */
+    size_t size;
+};
+
+/**
+ * Initializes UcxStack structure with memory.
+ * 
+ * @param stack a pointer to an uninitialized stack structure
+ * @param space the memory area that shall be managed
+ * @param size size of the memory area
+ * @return a new UcxStack structure
+ */
+void ucx_stack_init(UcxStack *stack, char* space, size_t size);
+
+/**
+ * Allocates stack memory.
+ * 
+ * @param stack a pointer to the stack
+ * @param n amount of memory to allocate
+ * @return a pointer to the allocated memory or <code>NULL</code> on stack
+ * overflow
+ * @see ucx_allocator_malloc()
+ */
+void *ucx_stack_malloc(UcxStack *stack, size_t n);
+
+/**
+ * Allocates memory with #ucx_stack_malloc() and copies the specified data if
+ * the allocation was successful.
+ * 
+ * @param stack a pointer to the stack
+ * @param n amount of memory to allocate
+ * @param data a pointer to the data to copy
+ * @return a pointer to the allocated memory
+ * @see ucx_stack_malloc
+ */
+void *ucx_stack_push(UcxStack *stack, size_t n, const void *data);
+
+/**
+ * Allocates an array of stack memory
+ * 
+ * The content of the allocated memory is set to zero.
+ * 
+ * @param stack a pointer to the stack
+ * @param nelem amount of elements to allocate
+ * @param elsize amount of memory per element
+ * @return a pointer to the allocated memory
+ * @see ucx_allocator_calloc()
+ */
+void *ucx_stack_calloc(UcxStack *stack, size_t nelem, size_t elsize);
+
+/**
+ * Allocates memory with #ucx_stack_calloc() and copies the specified data if
+ * the allocation was successful.
+ * 
+ * @param stack a pointer to the stack
+ * @param nelem amount of elements to allocate
+ * @param elsize amount of memory per element
+ * @param data a pointer to the data
+ * @return a pointer to the allocated memory
+ * @see ucx_stack_calloc
+ */
+void *ucx_stack_pusharr(UcxStack *stack,
+        size_t nelem, size_t elsize, const void *data);
+
+/**
+ * Reallocates memory on the stack.
+ * 
+ * Shrinking memory is always safe. Extending memory can be very expensive. 
+ * 
+ * @param stack the stack
+ * @param ptr a pointer to the memory that shall be reallocated
+ * @param n the new size of the memory
+ * @return a pointer to the new location of the memory
+ * @see ucx_allocator_realloc()
+ */
+void *ucx_stack_realloc(UcxStack *stack, void *ptr, size_t n);
+
+/**
+ * Frees memory on the stack.
+ * 
+ * Freeing stack memory behaves in a special way.
+ * 
+ * If the element, that should be freed, is the top most element of the stack,
+ * it is removed from the stack. Otherwise it is marked as freed. Marked
+ * elements are removed, when they become the top most elements of the stack.
+ * 
+ * @param stack a pointer to the stack
+ * @param ptr a pointer to the memory that shall be freed
+ */
+void ucx_stack_free(UcxStack *stack, void *ptr);
+
+
+/**
+ * Returns the size of the top most element.
+ * @param stack a pointer to the stack
+ * @return the size of the top most element
+ */
+#define ucx_stack_topsize(stack) ((stack)->top ? ((struct ucx_stack_metadata*)\
+                                  (stack)->top - 1)->size : 0)
+
+/**
+ * Removes the top most element from the stack and copies the content to <code>
+ * dest</code>, if specified.
+ * 
+ * Use #ucx_stack_topsize()# to get the amount of memory that must be available
+ * at the location of <code>dest</code>.
+ * 
+ * @param stack a pointer to the stack
+ * @param dest the location where the contents shall be written to, or <code>
+ * NULL</code>, if the element shall only be removed.
+ * @see ucx_stack_free
+ * @see ucx_stack_popn
+ */
+#define ucx_stack_pop(stack, dest) ucx_stack_popn(stack, dest, (size_t)-1)
+
+/**
+ * Removes the top most element from the stack and copies the content to <code>
+ * dest</code>.
+ * 
+ * This function copies at most <code>n</code> bytes to the destination, but
+ * the element is always freed as a whole.
+ * If the element was larger than <code>n</code>, the remaining data is lost.
+ * 
+ * @param stack a pointer to the stack
+ * @param dest the location where the contents shall be written to
+ * @param n copies at most n bytes to <code>dest</code>
+ * @see ucx_stack_pop
+ */
+void ucx_stack_popn(UcxStack *stack, void *dest, size_t n);
+
+/**
+ * Returns the remaining available memory on the specified stack.
+ * 
+ * @param stack a pointer to the stack
+ * @return the remaining available memory
+ */
+size_t ucx_stack_avail(UcxStack *stack);
+
+/**
+ * Checks, if the stack is empty.
+ * 
+ * @param stack a pointer to the stack
+ * @return nonzero, if the stack is empty, zero otherwise
+ */
+#define ucx_stack_empty(stack) (!(stack)->top)
+
+/**
+ * Computes a recommended size for the stack memory area. Note, that
+ * reallocations have not been taken into account, so you might need to reserve
+ * twice as much memory to allow many reallocations.
+ * 
+ * @param size the approximate payload
+ * @param elems the approximate count of element allocations
+ * @return a recommended size for the stack space based on the information
+ * provided
+ */
+#define ucx_stack_dim(size, elems) (size+sizeof(struct ucx_stack_metadata) * \
+                                    (elems + 1))
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_STACK_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/string.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,1201 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * Bounded string implementation.
+ * 
+ * The UCX strings (<code>sstr_t</code>) provide an alternative to C strings.
+ * The main difference to C strings is, that <code>sstr_t</code> does <b>not
+ * need to be <code>NULL</code>-terminated</b>. Instead the length is stored
+ * within the structure.
+ * 
+ * When using <code>sstr_t</code>, developers must be full aware of what type
+ * of string (<code>NULL</code>-terminated) or not) they are using, when 
+ * accessing the <code>char* ptr</code> directly.
+ * 
+ * The UCX string module provides some common string functions, known from
+ * standard libc, working with <code>sstr_t</code>.
+ * 
+ * @file   string.h
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_STRING_H
+#define	UCX_STRING_H
+
+#include "ucx.h"
+#include "allocator.h"
+#include <stddef.h>
+
+/*
+ * Use this macro to disable the shortcuts if you experience macro collision.
+ */
+#ifndef UCX_NO_SSTR_SHORTCUTS
+/**
+ * Shortcut for a <code>sstr_t struct</code>
+ * or <code>scstr_t struct</code> literal.
+ */
+#define ST(s) { s, sizeof(s)-1 }
+
+/** Shortcut for the conversion of a C string to a <code>sstr_t</code>. */
+#define S(s) sstrn(s, sizeof(s)-1)
+
+/** Shortcut for the conversion of a C string to a <code>scstr_t</code>. */
+#define SC(s) scstrn(s, sizeof(s)-1)
+#endif /* UCX_NO_SSTR_SHORTCUTS */
+
+/*
+ * Use this macro to disable the format macros.
+ */
+#ifndef UCX_NO_SSTR_FORMAT_MACROS
+/** Expands a sstr_t or scstr_t to printf arguments. */
+#define SFMT(s) (int) (s).length, (s).ptr
+
+/** Format specifier for a sstr_t or scstr_t. */
+#define PRIsstr ".*s"
+#endif /* UCX_NO_SSTR_FORMAT_MACROS */
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+  
+/**
+ * The UCX string structure.
+ */
+typedef struct {
+   /** A pointer to the string
+    * (<b>not necessarily <code>NULL</code>-terminated</b>) */
+    char *ptr;
+    /** The length of the string */
+    size_t length;
+} sstr_t;
+
+/**
+ * The UCX string structure for immutable (constant) strings.
+ */
+typedef struct {
+    /** A constant pointer to the immutable string
+     * (<b>not necessarily <code>NULL</code>-terminated</b>) */
+    const char *ptr;
+    /** The length of the string */
+    size_t length;
+} scstr_t;
+
+#ifdef	__cplusplus
+}
+#endif
+
+
+#ifdef __cplusplus
+/**
+ * One of two type adjustment functions that return an scstr_t.
+ * 
+ * Used <b>internally</b> to convert a UCX string to an immutable UCX string.
+ * 
+ * <b>Do not use this function manually.</b>
+ * 
+ * @param str some sstr_t
+ * @return an immutable (scstr_t) version of the provided string.
+ */
+inline scstr_t s2scstr(sstr_t s) {
+    scstr_t c;
+    c.ptr = s.ptr;
+    c.length = s.length;
+    return c;
+}
+
+/**
+ * One of two type adjustment functions that return an scstr_t.
+ * 
+ * Used <b>internally</b> to convert a UCX string to an immutable UCX string.
+ * This variant is used, when the string is already immutable and no operation
+ * needs to be performed.
+ * 
+ * <b>Do not use this function manually.</b>
+ * 
+ * @param str some scstr_t
+ * @return the argument itself
+ */
+inline scstr_t s2scstr(scstr_t str) {
+    return str;
+}
+
+/**
+ * Converts a UCX string to an immutable UCX string (scstr_t).
+ * @param str some UCX string
+ * @return an immutable version of the provided string
+ */
+#define SCSTR(s) s2scstr(s)
+#else
+
+/**
+ * One of two type adjustment functions that return an scstr_t.
+ * 
+ * Used <b>internally</b> to convert a UCX string to an immutable UCX string.
+ * This variant is used, when the string is already immutable and no operation
+ * needs to be performed.
+ * 
+ * <b>Do not use this function manually.</b>
+ * 
+ * @param str some scstr_t
+ * @return the argument itself
+ */
+scstr_t ucx_sc2sc(scstr_t str);
+
+/**
+ * One of two type adjustment functions that return an scstr_t.
+ * 
+ * Used <b>internally</b> to convert a UCX string to an immutable UCX string.
+ * 
+ * <b>Do not use this function manually.</b>
+ * 
+ * @param str some sstr_t
+ * @return an immutable (scstr_t) version of the provided string.
+ */
+scstr_t ucx_ss2sc(sstr_t str);
+
+#if __STDC_VERSION__ >= 201112L
+/**
+ * Converts a UCX string to an immutable UCX string (scstr_t).
+ * @param str some UCX string
+ * @return an immutable version of the provided string
+ */
+#define SCSTR(str) _Generic(str, sstr_t: ucx_ss2sc, scstr_t: ucx_sc2sc)(str)
+
+#elif defined(__GNUC__) || defined(__clang__)
+
+/**
+ * Converts a UCX string to an immutable UCX string (scstr_t).
+ * @param str some UCX string
+ * @return an immutable version of the provided string
+ */
+#define SCSTR(str) __builtin_choose_expr( \
+        __builtin_types_compatible_p(typeof(str), sstr_t), \
+        ucx_ss2sc, \
+        ucx_sc2sc)(str)
+
+#elif defined(__sun)
+
+/**
+ * Converts a UCX string to an immutable UCX string (scstr_t).
+ * @param str some UCX string
+ * @return the an immutable version of the provided string
+ */
+#define SCSTR(str) ({typeof(str) ucx_tmp_var_str = str; \
+	scstr_t ucx_tmp_var_c; \
+	ucx_tmp_var_c.ptr = ucx_tmp_var_str.ptr;\
+	ucx_tmp_var_c.length = ucx_tmp_var_str.length;\
+	ucx_tmp_var_c; })
+#else /* no generics and no builtins */
+
+/**
+ * Converts a UCX string to an immutable UCX string (scstr_t).
+ * 
+ * This <b>internal</b> function (ab)uses the C standard an expects one single
+ * argument which is then implicitly converted to scstr_t without a warning.
+ * 
+ * <b>Do not use this function manually.</b>
+ * 
+ * @return the an immutable version of the provided string
+ */
+scstr_t ucx_ss2c_s();
+
+/**
+ * Converts a UCX string to an immutable UCX string (scstr_t).
+ * @param str some UCX string
+ * @return the an immutable version of the provided string
+ */
+#define SCSTR(str) ucx_ss2c_s(str)
+#endif /* C11 feature test */
+
+#endif /* C++ */
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * Creates a new sstr_t based on a C string.
+ * 
+ * The length is implicitly inferred by using a call to <code>strlen()</code>.
+ *
+ * <b>Note:</b> the sstr_t will share the specified pointer to the C string.
+ * If you do want a copy, use sstrdup() on the return value of this function.
+ * 
+ * If you need to wrap a constant string, use scstr().
+ * 
+ * @param cstring the C string to wrap
+ * @return a new sstr_t containing the C string
+ * 
+ * @see sstrn()
+ */
+sstr_t sstr(char *cstring);
+
+/**
+ * Creates a new sstr_t of the specified length based on a C string.
+ *
+ * <b>Note:</b> the sstr_t will share the specified pointer to the C string.
+ * If you do want a copy, use sstrdup() on the return value of this function.
+ * 
+ * If you need to wrap a constant string, use scstrn().
+ * 
+ * @param cstring  the C string to wrap
+ * @param length   the length of the string
+ * @return a new sstr_t containing the C string
+ * 
+ * @see sstr()
+ * @see S()
+ */
+sstr_t sstrn(char *cstring, size_t length);
+
+/**
+ * Creates a new scstr_t based on a constant C string.
+ * 
+ * The length is implicitly inferred by using a call to <code>strlen()</code>.
+ *
+ * <b>Note:</b> the scstr_t will share the specified pointer to the C string.
+ * If you do want a copy, use scstrdup() on the return value of this function.
+ * 
+ * @param cstring the C string to wrap
+ * @return a new scstr_t containing the C string
+ * 
+ * @see scstrn()
+ */
+scstr_t scstr(const char *cstring);
+
+
+/**
+ * Creates a new scstr_t of the specified length based on a constant C string.
+ *
+ * <b>Note:</b> the scstr_t will share the specified pointer to the C string.
+ * If you do want a copy, use scstrdup() on the return value of this function. * 
+ * 
+ * @param cstring  the C string to wrap
+ * @param length   the length of the string
+ * @return a new scstr_t containing the C string
+ * 
+ * @see scstr()
+ */
+scstr_t scstrn(const char *cstring, size_t length);
+
+/**
+ * Returns the accumulated length of all specified strings.
+ * 
+ * <b>Attention:</b> if the count argument is larger than the count of the
+ * specified strings, the behavior is undefined.
+ *
+ * @param count    the total number of specified strings
+ * @param ...      all strings
+ * @return the accumulated length of all strings
+ */
+size_t scstrnlen(size_t count, ...);
+
+/**
+ * Returns the accumulated length of all specified strings.
+ * 
+ * <b>Attention:</b> if the count argument is larger than the count of the
+ * specified strings, the behavior is undefined.
+ * 
+ * @param count    the total number of specified strings
+ * @param ...      all strings
+ * @return the cumulated length of all strings
+ */
+#define sstrnlen(count, ...) scstrnlen(count, __VA_ARGS__)
+
+/**
+ * Concatenates two or more strings.
+ * 
+ * The resulting string will be allocated by standard <code>malloc()</code>. 
+ * So developers <b>MUST</b> pass the sstr_t.ptr to <code>free()</code>.
+ * 
+ * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
+ * terminated.
+ *
+ * @param count   the total number of strings to concatenate
+ * @param s1      first string
+ * @param ...     all remaining strings
+ * @return the concatenated string
+ */
+sstr_t scstrcat(size_t count, scstr_t s1, ...);
+
+/**
+ * Concatenates two or more strings.
+ * 
+ * The resulting string will be allocated by standard <code>malloc()</code>. 
+ * So developers <b>MUST</b> pass the sstr_t.ptr to <code>free()</code>.
+ * 
+ * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
+ * terminated.
+ * 
+ * @param count   the total number of strings to concatenate
+ * @param s1      first string
+ * @param ...     all remaining strings
+ * @return the concatenated string
+ */
+#define sstrcat(count, s1, ...) scstrcat(count, SCSTR(s1), __VA_ARGS__)
+
+/**
+ * Concatenates two or more strings using a UcxAllocator.
+ * 
+ * The resulting string must be freed by the allocators <code>free()</code>
+ * implementation.
+ * 
+ * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
+ * terminated.
+ *
+ * @param alloc   the allocator to use
+ * @param count   the total number of strings to concatenate
+ * @param s1      first string
+ * @param ...     all remaining strings
+ * @return the concatenated string
+ * 
+ * @see scstrcat()
+ */
+sstr_t scstrcat_a(UcxAllocator *alloc, size_t count, scstr_t s1, ...);
+
+/**
+ * Concatenates two or more strings using a UcxAllocator.
+ * 
+ * The resulting string must be freed by the allocators <code>free()</code>
+ * implementation.
+ * 
+ * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
+ * terminated.
+ *
+ * @param alloc   the allocator to use
+ * @param count   the total number of strings to concatenate
+ * @param s1      first string
+ * @param ...     all remaining strings
+ * @return the concatenated string
+ * 
+ * @see sstrcat()
+ */
+#define sstrcat_a(alloc, count, s1, ...) \
+    scstrcat_a(alloc, count, SCSTR(s1), __VA_ARGS__)
+
+/**
+ * Returns a substring starting at the specified location.
+ * 
+ * <b>Attention:</b> the new string references the same memory area as the
+ * input string and is <b>NOT</b> required to be <code>NULL</code>-terminated.
+ * Use sstrdup() to get a copy.
+ * 
+ * @param string input string
+ * @param start  start location of the substring
+ * @return a substring of <code>string</code> starting at <code>start</code>
+ * 
+ * @see sstrsubsl()
+ * @see sstrchr()
+ */
+sstr_t sstrsubs(sstr_t string, size_t start);
+
+/**
+ * Returns a substring with the given length starting at the specified location.
+ * 
+ * <b>Attention:</b> the new string references the same memory area as the
+ * input string and is <b>NOT</b> required to be <code>NULL</code>-terminated.
+ * Use sstrdup() to get a copy.
+ * 
+ * @param string input string
+ * @param start  start location of the substring
+ * @param length the maximum length of the substring
+ * @return a substring of <code>string</code> starting at <code>start</code>
+ * with a maximum length of <code>length</code>
+ * 
+ * @see sstrsubs()
+ * @see sstrchr()
+ */
+sstr_t sstrsubsl(sstr_t string, size_t start, size_t length);
+
+/**
+ * Returns a substring of an immutable string starting at the specified
+ * location.
+ * 
+ * <b>Attention:</b> the new string references the same memory area as the
+* input string and is <b>NOT</b> required to be <code>NULL</code>-terminated.
+ * Use scstrdup() to get a copy.
+ * 
+ * @param string input string
+ * @param start  start location of the substring
+ * @return a substring of <code>string</code> starting at <code>start</code>
+ * 
+ * @see scstrsubsl()
+ * @see scstrchr()
+ */
+scstr_t scstrsubs(scstr_t string, size_t start);
+
+/**
+ * Returns a substring of an immutable string with a maximum length starting
+ * at the specified location.
+ * 
+ * <b>Attention:</b> the new string references the same memory area as the
+ * input string and is <b>NOT</b> required to be <code>NULL</code>-terminated.
+ * Use scstrdup() to get a copy.
+ * 
+ * @param string input string
+ * @param start  start location of the substring
+ * @param length the maximum length of the substring
+ * @return a substring of <code>string</code> starting at <code>start</code>
+ * with a maximum length of <code>length</code>
+ * 
+ * @see scstrsubs()
+ * @see scstrchr()
+ */
+scstr_t scstrsubsl(scstr_t string, size_t start, size_t length);
+
+/**
+ * Returns a substring starting at the location of the first occurrence of the
+ * specified character.
+ * 
+ * If the string does not contain the character, an empty string is returned.
+ * 
+ * @param string the string where to locate the character
+ * @param chr    the character to locate
+ * @return       a substring starting at the first location of <code>chr</code>
+ * 
+ * @see sstrsubs()
+ */
+sstr_t sstrchr(sstr_t string, int chr);
+
+/**
+ * Returns a substring starting at the location of the last occurrence of the
+ * specified character.
+ * 
+ * If the string does not contain the character, an empty string is returned.
+ * 
+ * @param string the string where to locate the character
+ * @param chr    the character to locate
+ * @return       a substring starting at the last location of <code>chr</code>
+ * 
+ * @see sstrsubs()
+ */
+sstr_t sstrrchr(sstr_t string, int chr);
+
+/**
+ * Returns an immutable substring starting at the location of the first
+ * occurrence of the specified character.
+ * 
+ * If the string does not contain the character, an empty string is returned.
+ * 
+ * @param string the string where to locate the character
+ * @param chr    the character to locate
+ * @return       a substring starting at the first location of <code>chr</code>
+ * 
+ * @see scstrsubs()
+ */
+scstr_t scstrchr(scstr_t string, int chr);
+
+/**
+ * Returns an immutable substring starting at the location of the last
+ * occurrence of the specified character.
+ * 
+ * If the string does not contain the character, an empty string is returned.
+ * 
+ * @param string the string where to locate the character
+ * @param chr    the character to locate
+ * @return       a substring starting at the last location of <code>chr</code>
+ * 
+ * @see scstrsubs()
+ */
+scstr_t scstrrchr(scstr_t string, int chr);
+
+/**
+ * Returns a substring starting at the location of the first occurrence of the
+ * specified string.
+ * 
+ * If the string does not contain the other string, an empty string is returned.
+ * 
+ * If <code>match</code> is an empty string, the complete <code>string</code> is
+ * returned.
+ * 
+ * @param string the string to be scanned
+ * @param match  string containing the sequence of characters to match
+ * @return       a substring starting at the first occurrence of
+ *               <code>match</code>, or an empty string, if the sequence is not
+ *               present in <code>string</code>
+ */
+sstr_t scstrsstr(sstr_t string, scstr_t match);
+
+/**
+ * Returns a substring starting at the location of the first occurrence of the
+ * specified string.
+ * 
+ * If the string does not contain the other string, an empty string is returned.
+ * 
+ * If <code>match</code> is an empty string, the complete <code>string</code> is
+ * returned.
+ * 
+ * @param string the string to be scanned
+ * @param match  string containing the sequence of characters to match
+ * @return       a substring starting at the first occurrence of
+ *               <code>match</code>, or an empty string, if the sequence is not
+ *               present in <code>string</code>
+ */
+#define sstrstr(string, match) scstrsstr(string, SCSTR(match))
+
+/**
+ * Returns an immutable substring starting at the location of the
+ * first occurrence of the specified immutable string.
+ * 
+ * If the string does not contain the other string, an empty string is returned.
+ * 
+ * If <code>match</code> is an empty string, the complete <code>string</code> is
+ * returned.
+ * 
+ * @param string the string to be scanned
+ * @param match  string containing the sequence of characters to match
+ * @return       a substring starting at the first occurrence of
+ *               <code>match</code>, or an empty string, if the sequence is not
+ *               present in <code>string</code>
+ */
+scstr_t scstrscstr(scstr_t string, scstr_t match);
+
+/**
+ * Returns an immutable substring starting at the location of the
+ * first occurrence of the specified immutable string.
+ * 
+ * If the string does not contain the other string, an empty string is returned.
+ * 
+ * If <code>match</code> is an empty string, the complete <code>string</code> is
+ * returned.
+ * 
+ * @param string the string to be scanned
+ * @param match  string containing the sequence of characters to match
+ * @return       a substring starting at the first occurrence of
+ *               <code>match</code>, or an empty string, if the sequence is not
+ *               present in <code>string</code>
+ */
+#define sstrscstr(string, match) scstrscstr(string, SCSTR(match))
+
+/**
+ * Splits a string into parts by using a delimiter string.
+ * 
+ * This function will return <code>NULL</code>, if one of the following happens:
+ * <ul>
+ *   <li>the string length is zero</li>
+ *   <li>the delimeter length is zero</li>
+ *   <li>the string equals the delimeter</li>
+ *   <li>memory allocation fails</li>
+ * </ul>
+ * 
+ * The integer referenced by <code>count</code> is used as input and determines
+ * the maximum size of the resulting array, i.e. the maximum count of splits to
+ * perform + 1.
+ * 
+ * The integer referenced by <code>count</code> is also used as output and is
+ * set to
+ * <ul>
+ *   <li>-2, on memory allocation errors</li>
+ *   <li>-1, if either the string or the delimiter is an empty string</li>
+ *   <li>0, if the string equals the delimiter</li>
+ *   <li>1, if the string does not contain the delimiter</li>
+ *   <li>the count of array items, otherwise</li>
+ * </ul>
+ * 
+ * If the string starts with the delimiter, the first item of the resulting
+ * array will be an empty string.
+ * 
+ * If the string ends with the delimiter and the maximum list size is not
+ * exceeded, the last array item will be an empty string.
+ * In case the list size would be exceeded, the last array item will be the
+ * remaining string after the last split, <i>including</i> the terminating
+ * delimiter.
+ * 
+ * <b>Attention:</b> The array pointer <b>AND</b> all sstr_t.ptr of the array
+ * items must be manually passed to <code>free()</code>. Use scstrsplit_a() with
+ * an allocator to managed memory, to avoid this.
+ *
+ * @param string the string to split
+ * @param delim  the delimiter string
+ * @param count  IN: the maximum size of the resulting array (0 = no limit),
+ *               OUT: the actual size of the array
+ * @return a sstr_t array containing the split strings or
+ * <code>NULL</code> on error
+ * 
+ * @see scstrsplit_a()
+ */
+sstr_t* scstrsplit(scstr_t string, scstr_t delim, ssize_t *count);
+
+/**
+ * Splits a string into parts by using a delimiter string.
+ * 
+ * This function will return <code>NULL</code>, if one of the following happens:
+ * <ul>
+ *   <li>the string length is zero</li>
+ *   <li>the delimeter length is zero</li>
+ *   <li>the string equals the delimeter</li>
+ *   <li>memory allocation fails</li>
+ * </ul>
+ * 
+ * The integer referenced by <code>count</code> is used as input and determines
+ * the maximum size of the resulting array, i.e. the maximum count of splits to
+ * perform + 1.
+ * 
+ * The integer referenced by <code>count</code> is also used as output and is
+ * set to
+ * <ul>
+ *   <li>-2, on memory allocation errors</li>
+ *   <li>-1, if either the string or the delimiter is an empty string</li>
+ *   <li>0, if the string equals the delimiter</li>
+ *   <li>1, if the string does not contain the delimiter</li>
+ *   <li>the count of array items, otherwise</li>
+ * </ul>
+ * 
+ * If the string starts with the delimiter, the first item of the resulting
+ * array will be an empty string.
+ * 
+ * If the string ends with the delimiter and the maximum list size is not
+ * exceeded, the last array item will be an empty string.
+ * In case the list size would be exceeded, the last array item will be the
+ * remaining string after the last split, <i>including</i> the terminating
+ * delimiter.
+ * 
+ * <b>Attention:</b> The array pointer <b>AND</b> all sstr_t.ptr of the array
+ * items must be manually passed to <code>free()</code>. Use sstrsplit_a() with
+ * an allocator to managed memory, to avoid this.
+ *
+ * @param string the string to split
+ * @param delim  the delimiter string
+ * @param count  IN: the maximum size of the resulting array (0 = no limit),
+ *               OUT: the actual size of the array
+ * @return a sstr_t array containing the split strings or
+ * <code>NULL</code> on error
+ * 
+ * @see sstrsplit_a()
+ */
+#define sstrsplit(string, delim, count) \
+    scstrsplit(SCSTR(string), SCSTR(delim), count)
+
+/**
+ * Performing scstrsplit() using a UcxAllocator.
+ * 
+ * <i>Read the description of scstrsplit() for details.</i>
+ * 
+ * The memory for the sstr_t.ptr pointers of the array items and the memory for
+ * the sstr_t array itself are allocated by using the UcxAllocator.malloc()
+ * function.
+ * 
+ * @param allocator the UcxAllocator used for allocating memory
+ * @param string the string to split
+ * @param delim  the delimiter string
+ * @param count  IN: the maximum size of the resulting array (0 = no limit),
+ *               OUT: the actual size of the array
+ * @return a sstr_t array containing the split strings or
+ * <code>NULL</code> on error
+ * 
+ * @see scstrsplit()
+ */
+sstr_t* scstrsplit_a(UcxAllocator *allocator, scstr_t string, scstr_t delim,
+        ssize_t *count);
+
+/**
+ * Performing sstrsplit() using a UcxAllocator.
+ * 
+ * <i>Read the description of sstrsplit() for details.</i>
+ * 
+ * The memory for the sstr_t.ptr pointers of the array items and the memory for
+ * the sstr_t array itself are allocated by using the UcxAllocator.malloc()
+ * function.
+ * 
+ * @param allocator the UcxAllocator used for allocating memory
+ * @param string the string to split
+ * @param delim  the delimiter string
+ * @param count  IN: the maximum size of the resulting array (0 = no limit),
+ *               OUT: the actual size of the array
+ * @return a sstr_t array containing the split strings or
+ * <code>NULL</code> on error
+ * 
+ * @see sstrsplit()
+ */
+#define sstrsplit_a(allocator, string, delim, count) \
+    scstrsplit_a(allocator, SCSTR(string), SCSTR(delim), count)
+
+/**
+ * Compares two UCX strings with standard <code>memcmp()</code>.
+ * 
+ * At first it compares the scstr_t.length attribute of the two strings. The
+ * <code>memcmp()</code> function is called, if and only if the lengths match.
+ * 
+ * @param s1 the first string
+ * @param s2 the second string
+ * @return -1, if the length of s1 is less than the length of s2 or 1, if the 
+ * length of s1 is greater than the length of s2 or the result of
+ * <code>memcmp()</code> otherwise (i.e. 0 if the strings match)
+ */
+int scstrcmp(scstr_t s1, scstr_t s2);
+
+/**
+ * Compares two UCX strings with standard <code>memcmp()</code>.
+ * 
+ * At first it compares the sstr_t.length attribute of the two strings. The
+ * <code>memcmp()</code> function is called, if and only if the lengths match.
+ * 
+ * @param s1 the first string
+ * @param s2 the second string
+ * @return -1, if the length of s1 is less than the length of s2 or 1, if the 
+ * length of s1 is greater than the length of s2 or the result of
+ * <code>memcmp()</code> otherwise (i.e. 0 if the strings match)
+ */
+#define sstrcmp(s1, s2) scstrcmp(SCSTR(s1), SCSTR(s2))
+
+/**
+ * Compares two UCX strings ignoring the case.
+ * 
+ * At first it compares the scstr_t.length attribute of the two strings. If and
+ * only if the lengths match, both strings are compared char by char ignoring
+ * the case.
+ * 
+ * @param s1 the first string
+ * @param s2 the second string
+ * @return -1, if the length of s1 is less than the length of s2 or 1, if the 
+ * length of s1 is greater than the length of s2 or the result of the platform
+ * specific string comparison function ignoring the case.
+ */
+int scstrcasecmp(scstr_t s1, scstr_t s2);
+
+/**
+ * Compares two UCX strings ignoring the case.
+ * 
+ * At first it compares the sstr_t.length attribute of the two strings. If and
+ * only if the lengths match, both strings are compared char by char ignoring
+ * the case.
+ * 
+ * @param s1 the first string
+ * @param s2 the second string
+ * @return -1, if the length of s1 is less than the length of s2 or 1, if the 
+ * length of s1 is greater than the length of s2 or the result of the platform
+ * specific string comparison function ignoring the case.
+ */
+#define sstrcasecmp(s1, s2) scstrcasecmp(SCSTR(s1), SCSTR(s2))
+
+/**
+ * Creates a duplicate of the specified string.
+ * 
+ * The new sstr_t will contain a copy allocated by standard
+ * <code>malloc()</code>. So developers <b>MUST</b> pass the sstr_t.ptr to
+ * <code>free()</code>.
+ * 
+ * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
+ * terminated and mutable, regardless of the argument.
+ * 
+ * @param string the string to duplicate
+ * @return a duplicate of the string
+ * @see scstrdup_a()
+ */
+sstr_t scstrdup(scstr_t string);
+
+/**
+ * Creates a duplicate of the specified string.
+ * 
+ * The new sstr_t will contain a copy allocated by standard
+ * <code>malloc()</code>. So developers <b>MUST</b> pass the sstr_t.ptr to
+ * <code>free()</code>.
+ * 
+ * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
+ * terminated, regardless of the argument.
+ * 
+ * @param string the string to duplicate
+ * @return a duplicate of the string
+ * @see sstrdup_a()
+ */
+#define sstrdup(string) scstrdup(SCSTR(string))
+
+/**
+ * Creates a duplicate of the specified string using a UcxAllocator.
+ * 
+ * The new sstr_t will contain a copy allocated by the allocators
+ * UcxAllocator.malloc() function. So it is implementation depended, whether the
+ * returned sstr_t.ptr pointer must be passed to the allocators
+ * UcxAllocator.free() function manually.
+ * 
+ * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
+ * terminated and mutable, regardless of the argument.
+ * 
+ * @param allocator a valid instance of a UcxAllocator
+ * @param string the string to duplicate
+ * @return a duplicate of the string
+ * @see scstrdup()
+ */
+sstr_t scstrdup_a(UcxAllocator *allocator, scstr_t string);
+
+/**
+ * Creates a duplicate of the specified string using a UcxAllocator.
+ * 
+ * The new sstr_t will contain a copy allocated by the allocators
+ * UcxAllocator.malloc() function. So it is implementation depended, whether the
+ * returned sstr_t.ptr pointer must be passed to the allocators
+ * UcxAllocator.free() function manually.
+ * 
+ * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
+ * terminated, regardless of the argument.
+ * 
+ * @param allocator a valid instance of a UcxAllocator
+ * @param string the string to duplicate
+ * @return a duplicate of the string
+ * @see scstrdup()
+ */
+#define sstrdup_a(allocator, string) scstrdup_a(allocator, SCSTR(string))
+
+
+/**
+ * Omits leading and trailing spaces.
+ * 
+ * This function returns a new sstr_t containing a trimmed version of the
+ * specified string.
+ * 
+ * <b>Note:</b> the new sstr_t references the same memory, thus you
+ * <b>MUST NOT</b> pass the sstr_t.ptr of the return value to
+ * <code>free()</code>. It is also highly recommended to avoid assignments like
+ * <code>mystr = sstrtrim(mystr);</code> as you lose the reference to the
+ * source string. Assignments of this type are only permitted, if the
+ * sstr_t.ptr of the source string does not need to be freed or if another
+ * reference to the source string exists.
+ * 
+ * @param string the string that shall be trimmed
+ * @return a new sstr_t containing the trimmed string
+ */
+sstr_t sstrtrim(sstr_t string);
+
+/**
+ * Omits leading and trailing spaces.
+ * 
+ * This function returns a new scstr_t containing a trimmed version of the
+ * specified string.
+ * 
+ * <b>Note:</b> the new scstr_t references the same memory, thus you
+ * <b>MUST NOT</b> pass the scstr_t.ptr of the return value to
+ * <code>free()</code>. It is also highly recommended to avoid assignments like
+ * <code>mystr = scstrtrim(mystr);</code> as you lose the reference to the
+ * source string. Assignments of this type are only permitted, if the
+ * scstr_t.ptr of the source string does not need to be freed or if another
+ * reference to the source string exists.
+ * 
+ * @param string the string that shall be trimmed
+ * @return a new scstr_t containing the trimmed string
+ */
+scstr_t scstrtrim(scstr_t string);
+
+/**
+ * Checks, if a string has a specific prefix.
+ * 
+ * @param string the string to check
+ * @param prefix the prefix the string should have
+ * @return 1, if and only if the string has the specified prefix, 0 otherwise
+ */
+int scstrprefix(scstr_t string, scstr_t prefix);
+
+/**
+ * Checks, if a string has a specific prefix.
+ * 
+ * @param string the string to check
+ * @param prefix the prefix the string should have
+ * @return 1, if and only if the string has the specified prefix, 0 otherwise
+ */
+#define sstrprefix(string, prefix) scstrprefix(SCSTR(string), SCSTR(prefix))
+
+/**
+ * Checks, if a string has a specific suffix.
+ * 
+ * @param string the string to check
+ * @param suffix the suffix the string should have
+ * @return 1, if and only if the string has the specified suffix, 0 otherwise
+ */
+int scstrsuffix(scstr_t string, scstr_t suffix);
+
+/**
+ * Checks, if a string has a specific suffix.
+ *
+ * @param string the string to check
+ * @param suffix the suffix the string should have
+ * @return 1, if and only if the string has the specified suffix, 0 otherwise
+ */
+#define sstrsuffix(string, suffix) scstrsuffix(SCSTR(string), SCSTR(suffix))
+
+/**
+ * Checks, if a string has a specific prefix, ignoring the case.
+ * 
+ * @param string the string to check
+ * @param prefix the prefix the string should have
+ * @return 1, if and only if the string has the specified prefix, 0 otherwise
+ */
+int scstrcaseprefix(scstr_t string, scstr_t prefix);
+
+/**
+ * Checks, if a string has a specific prefix, ignoring the case.
+ * 
+ * @param string the string to check
+ * @param prefix the prefix the string should have
+ * @return 1, if and only if the string has the specified prefix, 0 otherwise
+ */
+#define sstrcaseprefix(string, prefix) \
+  scstrcaseprefix(SCSTR(string), SCSTR(prefix))
+
+/**
+ * Checks, if a string has a specific suffix, ignoring the case.
+ * 
+ * @param string the string to check
+ * @param suffix the suffix the string should have
+ * @return 1, if and only if the string has the specified suffix, 0 otherwise
+ */
+int scstrcasesuffix(scstr_t string, scstr_t suffix);
+
+/**
+ * Checks, if a string has a specific suffix, ignoring the case.
+ *
+ * @param string the string to check
+ * @param suffix the suffix the string should have
+ * @return 1, if and only if the string has the specified suffix, 0 otherwise
+ */
+#define sstrcasesuffix(string, suffix) \
+  scstrcasesuffix(SCSTR(string), SCSTR(suffix))
+
+/**
+ * Returns a lower case version of a string.
+ * 
+ * This function creates a duplicate of the input string, first
+ * (see scstrdup()).
+ * 
+ * @param string the input string
+ * @return the resulting lower case string
+ * @see scstrdup()
+ */
+sstr_t scstrlower(scstr_t string);
+
+/**
+ * Returns a lower case version of a string.
+ * 
+ * This function creates a duplicate of the input string, first
+ * (see sstrdup()).
+ * 
+ * @param string the input string
+ * @return the resulting lower case string
+ */
+#define sstrlower(string) scstrlower(SCSTR(string))
+
+/**
+ * Returns a lower case version of a string.
+ * 
+  * This function creates a duplicate of the input string, first
+ * (see scstrdup_a()).
+ * 
+ * @param allocator the allocator used for duplicating the string
+ * @param string the input string
+ * @return the resulting lower case string
+ * @see scstrdup_a()
+ */
+sstr_t scstrlower_a(UcxAllocator *allocator, scstr_t string);
+
+
+/**
+ * Returns a lower case version of a string.
+ * 
+ * This function creates a duplicate of the input string, first
+ * (see sstrdup_a()).
+ * 
+ * @param allocator the allocator used for duplicating the string
+ * @param string the input string
+ * @return the resulting lower case string
+ */
+#define sstrlower_a(allocator, string) scstrlower_a(allocator, SCSTR(string))
+
+/**
+ * Returns a upper case version of a string.
+ * 
+ * This function creates a duplicate of the input string, first
+ * (see scstrdup()).
+ * 
+ * @param string the input string
+ * @return the resulting upper case string
+ * @see scstrdup()
+ */
+sstr_t scstrupper(scstr_t string);
+
+/**
+ * Returns a upper case version of a string.
+ * 
+ * This function creates a duplicate of the input string, first
+ * (see sstrdup()).
+ * 
+ * @param string the input string
+ * @return the resulting upper case string
+ */
+#define sstrupper(string) scstrupper(SCSTR(string))
+
+/**
+ * Returns a upper case version of a string.
+ * 
+ * This function creates a duplicate of the input string, first
+ * (see scstrdup_a()).
+ * 
+ * @param allocator the allocator used for duplicating the string
+ * @param string the input string
+ * @return the resulting upper case string
+ * @see scstrdup_a()
+ */
+sstr_t scstrupper_a(UcxAllocator *allocator, scstr_t string);
+
+/**
+ * Returns a upper case version of a string.
+ * 
+ * This function creates a duplicate of the input string, first
+ * (see sstrdup_a()).
+ * 
+ * @param allocator the allocator used for duplicating the string
+ * @param string the input string
+ * @return the resulting upper case string
+ */
+#define sstrupper_a(allocator, string) scstrupper_a(allocator, string)
+
+
+/**
+ * Replaces a pattern in a string with another string.
+ *
+ * The pattern is taken literally and is no regular expression.
+ * Replaces at most <code>replmax</code> occurrences.
+ *
+ * The resulting string is allocated by the specified allocator. I.e. it
+ * depends on the used allocator, whether the sstr_t.ptr must be freed
+ * manually.
+ *
+ * If allocation fails, the sstr_t.ptr of the return value is NULL.
+ *
+ * @param allocator the allocator to use
+ * @param str the string where replacements should be applied
+ * @param pattern the pattern to search for
+ * @param replacement the replacement string
+ * @param replmax maximum number of replacements
+ * @return the resulting string after applying the replacements
+ */
+sstr_t scstrreplacen_a(UcxAllocator *allocator, scstr_t str,
+        scstr_t pattern, scstr_t replacement, size_t replmax);
+
+/**
+ * Replaces a pattern in a string with another string.
+ *
+ * The pattern is taken literally and is no regular expression.
+ * Replaces at most <code>replmax</code> occurrences.
+ *
+ * The sstr_t.ptr of the resulting string must be freed manually.
+ *
+ * If allocation fails, the sstr_t.ptr of the return value is NULL.
+ *
+ * @param str the string where replacements should be applied
+ * @param pattern the pattern to search for
+ * @param replacement the replacement string
+ * @param replmax maximum number of replacements
+ * @return the resulting string after applying the replacements
+ */
+sstr_t scstrreplacen(scstr_t str, scstr_t pattern,
+        scstr_t replacement, size_t replmax);
+
+/**
+ * Replaces a pattern in a string with another string.
+ *
+ * The pattern is taken literally and is no regular expression.
+ * Replaces at most <code>replmax</code> occurrences.
+ *
+ * The resulting string is allocated by the specified allocator. I.e. it
+ * depends on the used allocator, whether the sstr_t.ptr must be freed
+ * manually.
+ *
+ * @param allocator the allocator to use
+ * @param str the string where replacements should be applied
+ * @param pattern the pattern to search for
+ * @param replacement the replacement string
+ * @param replmax maximum number of replacements
+ * @return the resulting string after applying the replacements
+ */
+#define sstrreplacen_a(allocator, str, pattern, replacement, replmax) \
+        scstrreplacen_a(allocator, SCSTR(str), SCSTR(pattern), \
+            SCSTR(replacement), replmax)
+
+/**
+ * Replaces a pattern in a string with another string.
+ *
+ * The pattern is taken literally and is no regular expression.
+ * Replaces at most <code>replmax</code> occurrences.
+ *
+ * The sstr_t.ptr of the resulting string must be freed manually.
+ *
+ * If allocation fails, the sstr_t.ptr of the return value is NULL.
+ *
+ * @param str the string where replacements should be applied
+ * @param pattern the pattern to search for
+ * @param replacement the replacement string
+ * @param replmax maximum number of replacements
+ * @return the resulting string after applying the replacements
+ */
+#define sstrreplacen(str, pattern, replacement, replmax) \
+        scstrreplacen(SCSTR(str), SCSTR(pattern), SCSTR(replacement), replmax)
+
+/**
+ * Replaces a pattern in a string with another string.
+ *
+ * The pattern is taken literally and is no regular expression.
+ * Replaces at most <code>replmax</code> occurrences.
+ *
+ * The resulting string is allocated by the specified allocator. I.e. it
+ * depends on the used allocator, whether the sstr_t.ptr must be freed
+ * manually.
+ *
+ * If allocation fails, the sstr_t.ptr of the return value is NULL.
+ *
+ * @param allocator the allocator to use
+ * @param str the string where replacements should be applied
+ * @param pattern the pattern to search for
+ * @param replacement the replacement string
+ * @return the resulting string after applying the replacements
+ */
+#define sstrreplace_a(allocator, str, pattern, replacement) \
+        scstrreplacen_a(allocator, SCSTR(str), SCSTR(pattern), \
+            SCSTR(replacement), SIZE_MAX)
+
+/**
+ * Replaces a pattern in a string with another string.
+ *
+ * The pattern is taken literally and is no regular expression.
+ * Replaces at most <code>replmax</code> occurrences.
+ *
+ * The sstr_t.ptr of the resulting string must be freed manually.
+ *
+ * If allocation fails, the sstr_t.ptr of the return value is NULL.
+ *
+ * @param str the string where replacements should be applied
+ * @param pattern the pattern to search for
+ * @param replacement the replacement string
+ * @return the resulting string after applying the replacements
+ */
+#define sstrreplace(str, pattern, replacement) \
+        scstrreplacen(SCSTR(str), SCSTR(pattern), SCSTR(replacement), SIZE_MAX)
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_STRING_H */
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/test.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,241 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+ 
+/**
+ * @file: test.h
+ * 
+ * UCX Test Framework.
+ * 
+ * Usage of this test framework:
+ *
+ * **** IN HEADER FILE: ****
+ *
+ * <pre>
+ * UCX_TEST(function_name);
+ * UCX_TEST_SUBROUTINE(subroutine_name, paramlist); // optional
+ * </pre>
+ *
+ * **** IN SOURCE FILE: ****
+ * <pre>
+ * UCX_TEST_SUBROUTINE(subroutine_name, paramlist) {
+ *   // tests with UCX_TEST_ASSERT()
+ * }
+ * 
+ * UCX_TEST(function_name) {
+ *   // memory allocation and other stuff here
+ *   #UCX_TEST_BEGIN
+ *   // tests with UCX_TEST_ASSERT() and/or
+ *   // calls with UCX_TEST_CALL_SUBROUTINE() here
+ *   #UCX_TEST_END
+ *   // cleanup of memory here
+ * }
+ * </pre>
+ *
+ * <b>Note:</b> if a test fails, a longjump is performed
+ * back to the #UCX_TEST_BEGIN macro!
+ * 
+ * <b>Attention:</b> Do not call own functions within a test, that use
+ * UCX_TEST_ASSERT() macros and are not defined by using UCX_TEST_SUBROUTINE().
+ * 
+ *
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ *
+ */
+
+#ifndef UCX_TEST_H
+#define	UCX_TEST_H
+
+#include "ucx.h"
+#include <stdio.h>
+#include <string.h>
+#include <setjmp.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#ifndef __FUNCTION__
+
+/**
+ * Alias for the <code>__func__</code> preprocessor macro.
+ * Some compilers use <code>__func__</code> and others use __FUNCTION__.
+ * We use __FUNCTION__ so we define it for those compilers which use
+ * <code>__func__</code>.
+ */
+#define __FUNCTION__ __func__
+#endif
+
+/** Type for the UcxTestSuite. */
+typedef struct UcxTestSuite UcxTestSuite;
+
+/** Pointer to a test function. */
+typedef void(*UcxTest)(UcxTestSuite*,FILE*);
+
+/** Type for the internal list of test cases. */
+typedef struct UcxTestList UcxTestList;
+
+/** Structure for the internal list of test cases. */
+struct UcxTestList {
+    
+    /** Test case. */
+    UcxTest test;
+    
+    /** Pointer to the next list element. */
+    UcxTestList *next;
+};
+
+/**
+ * A test suite containing multiple test cases.
+ */
+struct UcxTestSuite {
+    
+    /** The number of successful tests after the suite has been run. */
+    unsigned int success;
+    
+    /** The number of failed tests after the suite has been run. */
+    unsigned int failure;
+    
+    /**
+     * Internal list of test cases.
+     * Use ucx_test_register() to add tests to this list.
+     */
+    UcxTestList *tests;
+};
+
+/**
+ * Creates a new test suite.
+ * @return a new test suite
+ */
+UcxTestSuite* ucx_test_suite_new();
+
+/**
+ * Destroys a test suite.
+ * @param suite the test suite to destroy
+ */
+void ucx_test_suite_free(UcxTestSuite* suite);
+
+/**
+ * Registers a test function with the specified test suite.
+ * 
+ * @param suite the suite, the test function shall be added to
+ * @param test the test function to register
+ * @return <code>EXIT_SUCCESS</code> on success or
+ * <code>EXIT_FAILURE</code> on failure
+ */
+int ucx_test_register(UcxTestSuite* suite, UcxTest test);
+
+/**
+ * Runs a test suite and writes the test log to the specified stream.
+ * @param suite the test suite to run
+ * @param outstream the stream the log shall be written to
+ */
+void ucx_test_run(UcxTestSuite* suite, FILE* outstream);
+
+/**
+ * Macro for a #UcxTest function header.
+ * 
+ * Use this macro to declare and/or define a #UcxTest function.
+ * 
+ * @param name the name of the test function
+ */
+#define UCX_TEST(name) void name(UcxTestSuite* _suite_,FILE *_output_)
+
+/**
+ * Marks the begin of a test.
+ * <b>Note:</b> Any UCX_TEST_ASSERT() calls must be performed <b>after</b>
+ * #UCX_TEST_BEGIN.
+ * 
+ * @see #UCX_TEST_END
+ */
+#define UCX_TEST_BEGIN fwrite("Running ", 1, 8, _output_);\
+        fwrite(__FUNCTION__, 1, strlen(__FUNCTION__), _output_);\
+        fwrite("... ", 1, 4, _output_);\
+        jmp_buf _env_; \
+        if (!setjmp(_env_)) {
+
+/**
+ * Checks a test assertion.
+ * If the assertion is correct, the test carries on. If the assertion is not
+ * correct, the specified message (terminated by a dot and a line break) is
+ * written to the test suites output stream.
+ * @param condition the condition to check
+ * @param message the message that shall be printed out on failure
+ */
+#define UCX_TEST_ASSERT(condition,message) if (!(condition)) { \
+        fwrite(message".\n", 1, 2+strlen(message), _output_); \
+        _suite_->failure++; \
+        longjmp(_env_, 1);\
+    }
+
+/**
+ * Macro for a test subroutine function header.
+ * 
+ * Use this to declare and/or define a subroutine that can be called by using
+ * UCX_TEST_CALL_SUBROUTINE().
+ * 
+ * @param name the name of the subroutine
+ * @param ... the parameter list
+ * 
+ * @see UCX_TEST_CALL_SUBROUTINE()
+ */
+#define UCX_TEST_SUBROUTINE(name,...) void name(UcxTestSuite* _suite_,\
+        FILE *_output_, jmp_buf _env_, __VA_ARGS__)
+
+/**
+ * Macro for calling a test subroutine.
+ * 
+ * Subroutines declared with UCX_TEST_SUBROUTINE() can be called by using this
+ * macro.
+ * 
+ * <b>Note:</b> You may <b>only</b> call subroutines within a #UCX_TEST_BEGIN-
+ * #UCX_TEST_END-block.
+ * 
+ * @param name the name of the subroutine
+ * @param ... the argument list
+ * 
+ * @see UCX_TEST_SUBROUTINE()
+ */
+#define UCX_TEST_CALL_SUBROUTINE(name,...) \
+        name(_suite_,_output_,_env_,__VA_ARGS__);
+
+/**
+ * Marks the end of a test.
+ * <b>Note:</b> Any UCX_TEST_ASSERT() calls must be performed <b>before</b>
+ * #UCX_TEST_END.
+ * 
+ * @see #UCX_TEST_BEGIN
+ */
+#define UCX_TEST_END fwrite("success.\n", 1, 9, _output_); _suite_->success++;}
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_TEST_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/ucx.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,204 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * Main UCX Header providing most common definitions.
+ * 
+ * @file   ucx.h
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_H
+#define	UCX_H
+
+/** Major UCX version as integer constant. */
+#define UCX_VERSION_MAJOR   2
+
+/** Minor UCX version as integer constant. */
+#define UCX_VERSION_MINOR   1
+
+/** Version constant which ensures to increase monotonically. */
+#define UCX_VERSION (((UCX_VERSION_MAJOR)<<16)|UCX_VERSION_MINOR)
+
+#include <stdlib.h>
+#include <stdint.h>
+
+#ifdef _WIN32
+#if !(defined __ssize_t_defined || defined _SSIZE_T_)
+#include <BaseTsd.h>
+typedef SSIZE_T ssize_t;
+#define __ssize_t_defined
+#define _SSIZE_T_
+#endif /* __ssize_t_defined and _SSIZE_T */
+#else /* !_WIN32 */
+#include <sys/types.h>
+#endif /* _WIN32 */
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+    
+
+/**
+ * A function pointer to a destructor function.
+ * @see ucx_mempool_setdestr()
+ * @see ucx_mempool_regdestr()
+ */
+typedef void(*ucx_destructor)(void*);
+
+/**
+ * Function pointer to a compare function.
+ * 
+ * The compare function shall take three arguments: the two values that shall be
+ * compared and optional additional data.
+ * The function shall then return -1 if the first argument is less than the
+ * second argument, 1 if the first argument is greater than the second argument
+ * and 0 if both arguments are equal. If the third argument is
+ * <code>NULL</code>, it shall be ignored.
+ */
+typedef int(*cmp_func)(const void*,const void*,void*);
+
+/**
+ * Function pointer to a distance function.
+ * 
+ * The distance function shall take three arguments: the two values for which
+ * the distance shall be computed and optional additional data.
+ * The function shall then return the signed distance as integer value.
+ */
+typedef intmax_t(*distance_func)(const void*,const void*,void*);
+
+/**
+ * Function pointer to a copy function.
+ * 
+ * The copy function shall create a copy of the first argument and may use
+ * additional data provided by the second argument. If the second argument is
+ * <code>NULL</code>, it shall be ignored.
+
+ * <b>Attention:</b> if pointers returned by functions of this type may be
+ * passed to <code>free()</code> depends on the implementation of the
+ * respective <code>copy_func</code>.
+ */
+typedef void*(*copy_func)(const void*,void*);
+
+/**
+ * Function pointer to a write function.
+ * 
+ * The signature of the write function shall be compatible to the signature
+ * of standard <code>fwrite</code>, though it may use arbitrary data types for
+ * source and destination.
+ * 
+ * The arguments shall contain (in ascending order): a pointer to the source,
+ * the length of one element, the element count and a pointer to the
+ * destination.
+ */
+typedef size_t(*write_func)(const void*, size_t, size_t, void*);
+
+/**
+ * Function pointer to a read function.
+ * 
+ * The signature of the read function shall be compatible to the signature
+ * of standard <code>fread</code>, though it may use arbitrary data types for
+ * source and destination.
+ * 
+ * The arguments shall contain (in ascending order): a pointer to the
+ * destination, the length of one element, the element count and a pointer to
+ * the source.
+ */
+typedef size_t(*read_func)(void*, size_t, size_t, void*);
+
+
+
+#if __GNUC__ >= 5 || defined(__clang__)
+#define UCX_MUL_BUILTIN
+
+#if __WORDSIZE == 32
+/**
+ * Alias for <code>__builtin_umul_overflow</code>.
+ * 
+ * Performs a multiplication of size_t values and checks for overflow.
+ * 
+ * @param a first operand
+ * @param b second operand
+ * @param result a pointer to a size_t, where the result should
+ * be stored
+ * @return zero, if no overflow occurred and the result is correct, non-zero
+ * otherwise
+ */
+#define ucx_szmul(a, b, result) __builtin_umul_overflow(a, b, result)
+#else /* __WORDSIZE != 32 */
+/**
+ * Alias for <code>__builtin_umull_overflow</code>.
+ * 
+ * Performs a multiplication of size_t values and checks for overflow.
+ * 
+ * @param a first operand
+ * @param b second operand
+ * @param result a pointer to a size_t, where the result should
+ * be stored
+ * @return zero, if no overflow occurred and the result is correct, non-zero
+ * otherwise
+ */
+#define ucx_szmul(a, b, result) __builtin_umull_overflow(a, b, result)
+#endif /* __WORDSIZE */
+
+#else /* no GNUC or clang bultin */
+
+/**
+ * Performs a multiplication of size_t values and checks for overflow.
+  *
+ * @param a first operand
+ * @param b second operand
+ * @param result a pointer to a size_t, where the result should
+ * be stored
+ * @return zero, if no overflow occurred and the result is correct, non-zero
+ * otherwise
+ */
+#define ucx_szmul(a, b, result) ucx_szmul_impl(a, b, result)
+
+/**
+ * Performs a multiplication of size_t values and checks for overflow.
+ *
+ * This is a custom implementation in case there is no compiler builtin
+ * available.
+ *
+ * @param a first operand
+ * @param b second operand
+ * @param result a pointer to a size_t where the result should be stored
+ * @return zero, if no overflow occurred and the result is correct, non-zero
+ * otherwise
+ */
+int ucx_szmul_impl(size_t a, size_t b, size_t *result);
+
+#endif
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/utils.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,508 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @file utils.h
+ * 
+ * Compare, copy and printf functions.
+ * 
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_UTILS_H
+#define UCX_UTILS_H
+
+#include "ucx.h"
+#include "string.h"
+#include "allocator.h"
+#include <inttypes.h>
+#include <string.h>
+#include <stdarg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Default buffer size for ucx_stream_copy() and ucx_stream_ncopy().
+ */
+#define UCX_STREAM_COPY_BUFSIZE 4096
+
+/**
+ * Copies a string.
+ * @param s the string to copy
+ * @param data omitted
+ * @return a pointer to a copy of s1 that can be passed to free(void*)
+ */
+void *ucx_strcpy(const void *s, void *data);
+
+/**
+ * Copies a memory area.
+ * @param m a pointer to the memory area
+ * @param n a pointer to the size_t containing the size of the memory area
+ * @return a pointer to a copy of the specified memory area that can
+ * be passed to free(void*)
+ */
+void *ucx_memcpy(const void *m, void *n);
+
+
+/**
+ * Reads data from a stream and writes it to another stream.
+ * 
+ * @param src the source stream
+ * @param dest the destination stream
+ * @param rfnc the read function
+ * @param wfnc the write function
+ * @param buf a pointer to the copy buffer or <code>NULL</code> if a buffer
+ * shall be implicitly created on the heap
+ * @param bufsize the size of the copy buffer - if <code>NULL</code> was
+ * provided for <code>buf</code>, this is the size of the buffer that shall be
+ * implicitly created
+ * @param n the maximum number of bytes that shall be copied
+ * @return the total number of bytes copied
+  */
+size_t ucx_stream_bncopy(void *src, void *dest, read_func rfnc, write_func wfnc,
+        char* buf, size_t bufsize, size_t n);
+
+/**
+ * Shorthand for an unbounded ucx_stream_bncopy call using a default buffer.
+ * 
+ * @param src the source stream
+ * @param dest the destination stream
+ * @param rfnc the read function
+ * @param wfnc the write function
+ * @return total number of bytes copied
+ * 
+ * @see #UCX_STREAM_COPY_BUFSIZE
+ */
+#define ucx_stream_copy(src,dest,rfnc,wfnc) ucx_stream_bncopy(\
+        src, dest, (read_func)rfnc, (write_func)wfnc, \
+        NULL, UCX_STREAM_COPY_BUFSIZE, (size_t)-1)
+
+/**
+ * Shorthand for ucx_stream_bncopy using a default copy buffer.
+ * 
+ * @param src the source stream
+ * @param dest the destination stream
+ * @param rfnc the read function
+ * @param wfnc the write function
+ * @param n maximum number of bytes that shall be copied
+ * @return total number of bytes copied
+ */
+#define ucx_stream_ncopy(src,dest,rfnc,wfnc, n) ucx_stream_bncopy(\
+        src, dest, (read_func)rfnc, (write_func)wfnc, \
+        NULL, UCX_STREAM_COPY_BUFSIZE, n)
+
+/**
+ * Shorthand for an unbounded ucx_stream_bncopy call using the specified buffer.
+ * 
+ * @param src the source stream
+ * @param dest the destination stream
+ * @param rfnc the read function
+ * @param wfnc the write function
+ * @param buf a pointer to the copy buffer or <code>NULL</code> if a buffer
+ * shall be implicitly created on the heap
+ * @param bufsize the size of the copy buffer - if <code>NULL</code> was
+ * provided for <code>buf</code>, this is the size of the buffer that shall be
+ * implicitly created
+ * @return total number of bytes copied
+ */
+#define ucx_stream_bcopy(src,dest,rfnc,wfnc, buf, bufsize) ucx_stream_bncopy(\
+        src, dest, (read_func)rfnc, (write_func)wfnc, \
+        buf, bufsize, (size_t)-1)
+
+/**
+ * Wraps the strcmp function.
+ * @param s1 string one
+ * @param s2 string two
+ * @param data omitted
+ * @return the result of strcmp(s1, s2)
+ */
+int ucx_cmp_str(const void *s1, const void *s2, void *data);
+
+/**
+ * Wraps the strncmp function.
+ * @param s1 string one
+ * @param s2 string two
+ * @param n a pointer to the size_t containing the third strncmp parameter
+ * @return the result of strncmp(s1, s2, *n)
+ */
+int ucx_cmp_strn(const void *s1, const void *s2, void *n);
+
+/**
+ * Wraps the sstrcmp function.
+ * @param s1 sstr one
+ * @param s2 sstr two
+ * @param data ignored
+ * @return the result of sstrcmp(s1, s2)
+ */
+int ucx_cmp_sstr(const void *s1, const void *s2, void *data);
+
+/**
+ * Compares two integers of type int.
+ * @param i1 pointer to integer one
+ * @param i2 pointer to integer two
+ * @param data omitted
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int ucx_cmp_int(const void *i1, const void *i2, void *data);
+
+/**
+ * Compares two integers of type long int.
+ * @param i1 pointer to long integer one
+ * @param i2 pointer to long integer two
+ * @param data omitted
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int ucx_cmp_longint(const void *i1, const void *i2, void *data);
+
+/**
+ * Compares two integers of type long long.
+ * @param i1 pointer to long long one
+ * @param i2 pointer to long long two
+ * @param data omitted
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int ucx_cmp_longlong(const void *i1, const void *i2, void *data);
+
+/**
+ * Compares two integers of type int16_t.
+ * @param i1 pointer to int16_t one
+ * @param i2 pointer to int16_t two
+ * @param data omitted
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int ucx_cmp_int16(const void *i1, const void *i2, void *data);
+
+/**
+ * Compares two integers of type int32_t.
+ * @param i1 pointer to int32_t one
+ * @param i2 pointer to int32_t two
+ * @param data omitted
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int ucx_cmp_int32(const void *i1, const void *i2, void *data);
+
+/**
+ * Compares two integers of type int64_t.
+ * @param i1 pointer to int64_t one
+ * @param i2 pointer to int64_t two
+ * @param data omitted
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int ucx_cmp_int64(const void *i1, const void *i2, void *data);
+
+/**
+ * Compares two integers of type unsigned int.
+ * @param i1 pointer to unsigned integer one
+ * @param i2 pointer to unsigned integer two
+ * @param data omitted
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int ucx_cmp_uint(const void *i1, const void *i2, void *data);
+
+/**
+ * Compares two integers of type unsigned long int.
+ * @param i1 pointer to unsigned long integer one
+ * @param i2 pointer to unsigned long integer two
+ * @param data omitted
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int ucx_cmp_ulongint(const void *i1, const void *i2, void *data);
+
+/**
+ * Compares two integers of type unsigned long long.
+ * @param i1 pointer to unsigned long long one
+ * @param i2 pointer to unsigned long long two
+ * @param data omitted
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int ucx_cmp_ulonglong(const void *i1, const void *i2, void *data);
+
+/**
+ * Compares two integers of type uint16_t.
+ * @param i1 pointer to uint16_t one
+ * @param i2 pointer to uint16_t two
+ * @param data omitted
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int ucx_cmp_uint16(const void *i1, const void *i2, void *data);
+
+/**
+ * Compares two integers of type uint32_t.
+ * @param i1 pointer to uint32_t one
+ * @param i2 pointer to uint32_t two
+ * @param data omitted
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int ucx_cmp_uint32(const void *i1, const void *i2, void *data);
+
+/**
+ * Compares two integers of type uint64_t.
+ * @param i1 pointer to uint64_t one
+ * @param i2 pointer to uint64_t two
+ * @param data omitted
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int ucx_cmp_uint64(const void *i1, const void *i2, void *data);
+
+/**
+ * Distance function for integers of type int.
+ * @param i1 pointer to integer one
+ * @param i2 pointer to integer two
+ * @param data omitted
+ * @return i1 minus i2
+ */
+intmax_t ucx_dist_int(const void *i1, const void *i2, void *data);
+
+/**
+ * Distance function for integers of type long int.
+ * @param i1 pointer to long integer one
+ * @param i2 pointer to long integer two
+ * @param data omitted
+ * @return i1 minus i2
+ */
+intmax_t ucx_dist_longint(const void *i1, const void *i2, void *data);
+
+/**
+ * Distance function for integers of type long long.
+ * @param i1 pointer to long long one
+ * @param i2 pointer to long long two
+ * @param data omitted
+ * @return i1 minus i2
+ */
+intmax_t ucx_dist_longlong(const void *i1, const void *i2, void *data);
+
+/**
+ * Distance function for integers of type int16_t.
+ * @param i1 pointer to int16_t one
+ * @param i2 pointer to int16_t two
+ * @param data omitted
+ * @return i1 minus i2
+ */
+intmax_t ucx_dist_int16(const void *i1, const void *i2, void *data);
+
+/**
+ * Distance function for integers of type int32_t.
+ * @param i1 pointer to int32_t one
+ * @param i2 pointer to int32_t two
+ * @param data omitted
+ * @return i1 minus i2
+ */
+intmax_t ucx_dist_int32(const void *i1, const void *i2, void *data);
+
+/**
+ * Distance function for integers of type int64_t.
+ * @param i1 pointer to int64_t one
+ * @param i2 pointer to int64_t two
+ * @param data omitted
+ * @return i1 minus i2
+ */
+intmax_t ucx_dist_int64(const void *i1, const void *i2, void *data);
+
+/**
+ * Distance function for integers of type unsigned int.
+ * @param i1 pointer to unsigned integer one
+ * @param i2 pointer to unsigned integer two
+ * @param data omitted
+ * @return i1 minus i2
+ */
+intmax_t ucx_dist_uint(const void *i1, const void *i2, void *data);
+
+/**
+ * Distance function for integers of type unsigned long int.
+ * @param i1 pointer to unsigned long integer one
+ * @param i2 pointer to unsigned long integer two
+ * @param data omitted
+ * @return i1 minus i2
+ */
+intmax_t ucx_dist_ulongint(const void *i1, const void *i2, void *data);
+
+/**
+ * Distance function for integers of type unsigned long long.
+ * @param i1 pointer to unsigned long long one
+ * @param i2 pointer to unsigned long long two
+ * @param data omitted
+ * @return i1 minus i2
+ */
+intmax_t ucx_dist_ulonglong(const void *i1, const void *i2, void *data);
+
+/**
+ * Distance function for integers of type uint16_t.
+ * @param i1 pointer to uint16_t one
+ * @param i2 pointer to uint16_t two
+ * @param data omitted
+ * @return i1 minus i2
+ */
+intmax_t ucx_dist_uint16(const void *i1, const void *i2, void *data);
+
+/**
+ * Distance function for integers of type uint32_t.
+ * @param i1 pointer to uint32_t one
+ * @param i2 pointer to uint32_t two
+ * @param data omitted
+ * @return i1 minus i2
+ */
+intmax_t ucx_dist_uint32(const void *i1, const void *i2, void *data);
+
+/**
+ * Distance function for integers of type uint64_t.
+ * @param i1 pointer to uint64_t one
+ * @param i2 pointer to uint64_t two
+ * @param data omitted
+ * @return i1 minus i2
+ */
+intmax_t ucx_dist_uint64(const void *i1, const void *i2, void *data);
+
+/**
+ * Compares two real numbers of type float.
+ * @param f1 pointer to float one
+ * @param f2 pointer to float two
+ * @param data if provided: a pointer to precision (default: 1e-6f)
+ * @return -1, if *f1 is less than *f2, 0 if both are equal,
+ * 1 if *f1 is greater than *f2
+ */
+
+int ucx_cmp_float(const void *f1, const void *f2, void *data);
+
+/**
+ * Compares two real numbers of type double.
+ * @param d1 pointer to double one
+ * @param d2 pointer to double two
+ * @param data if provided: a pointer to precision (default: 1e-14)
+ * @return -1, if *d1 is less than *d2, 0 if both are equal,
+ * 1 if *d1 is greater than *d2
+ */
+int ucx_cmp_double(const void *d1, const void *d2, void *data);
+
+/**
+ * Compares two pointers.
+ * @param ptr1 pointer one
+ * @param ptr2 pointer two
+ * @param data omitted
+ * @return -1 if ptr1 is less than ptr2, 0 if both are equal,
+ * 1 if ptr1 is greater than ptr2
+ */
+int ucx_cmp_ptr(const void *ptr1, const void *ptr2, void *data);
+
+/**
+ * Compares two memory areas.
+ * @param ptr1 pointer one
+ * @param ptr2 pointer two
+ * @param n a pointer to the size_t containing the third parameter for memcmp
+ * @return the result of memcmp(ptr1, ptr2, *n)
+ */
+int ucx_cmp_mem(const void *ptr1, const void *ptr2, void *n);
+
+/**
+ * A <code>printf()</code> like function which writes the output to a stream by
+ * using a write_func().
+ * @param stream the stream the data is written to
+ * @param wfc the write function
+ * @param fmt format string
+ * @param ... additional arguments
+ * @return the total number of bytes written
+ */
+int ucx_fprintf(void *stream, write_func wfc, const char *fmt, ...);
+
+/**
+ * <code>va_list</code> version of ucx_fprintf().
+ * @param stream the stream the data is written to
+ * @param wfc the write function
+ * @param fmt format string
+ * @param ap argument list
+ * @return the total number of bytes written
+ * @see ucx_fprintf()
+ */
+int ucx_vfprintf(void *stream, write_func wfc, const char *fmt, va_list ap);
+
+/**
+ * A <code>printf()</code> like function which allocates space for a sstr_t
+ * the result is written to.
+ * 
+ * <b>Attention</b>: The sstr_t data is allocated with the allocators
+ * ucx_allocator_malloc() function. So it is implementation dependent, if
+ * the returned sstr_t.ptr pointer must be passed to the allocators
+ * ucx_allocator_free() function manually.
+ * 
+ * <b>Note</b>: The sstr_t.ptr of the return value will <i>always</i> be
+ * <code>NULL</code>-terminated.
+ * 
+ * @param allocator the UcxAllocator used for allocating the result sstr_t
+ * @param fmt format string
+ * @param ... additional arguments
+ * @return a sstr_t containing the formatted string
+ */
+sstr_t ucx_asprintf(UcxAllocator *allocator, const char *fmt, ...);
+
+/**
+ * <code>va_list</code> version of ucx_asprintf().
+ * 
+ * @param allocator the UcxAllocator used for allocating the result sstr_t
+ * @param fmt format string
+ * @param ap argument list
+ * @return a sstr_t containing the formatted string
+ * @see ucx_asprintf()
+ */
+sstr_t ucx_vasprintf(UcxAllocator *allocator, const char *fmt, va_list ap);
+
+/** Shortcut for ucx_asprintf() with default allocator. */
+#define ucx_sprintf(...) \
+    ucx_asprintf(ucx_default_allocator(), __VA_ARGS__)
+
+/**
+ * A <code>printf()</code> like function which writes the output to a
+ * UcxBuffer.
+ * 
+ * @param buffer the buffer the data is written to
+ * @param ... format string and additional arguments
+ * @return the total number of bytes written
+ * @see ucx_fprintf()
+ */
+#define ucx_bprintf(buffer, ...) ucx_fprintf((UcxBuffer*)buffer, \
+        (write_func)ucx_buffer_write, __VA_ARGS__)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UCX_UTILS_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/utils.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,448 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/utils.h"
+
+#include <math.h>
+#include <stdio.h>
+#include <limits.h>
+#include <errno.h>
+
+/* COPY FUCNTIONS */
+void* ucx_strcpy(const void* s, void* data) {
+    const char *str = (const char*) s;
+    size_t n = 1+strlen(str);
+    char *cpy = (char*) malloc(n);
+    memcpy(cpy, str, n);
+    return cpy;
+}
+
+void* ucx_memcpy(const void* m, void* n) {
+    size_t k = *((size_t*)n);
+    void *cpy = malloc(k);
+    memcpy(cpy, m, k);
+    return cpy;
+}
+
+size_t ucx_stream_bncopy(void *src, void *dest, read_func readfnc,
+        write_func writefnc, char* buf, size_t bufsize, size_t n) {
+    if(n == 0 || bufsize == 0) {
+        return 0;
+    }
+    
+    char *lbuf;    
+    size_t ncp = 0;
+    
+    if(buf) {
+        lbuf = buf;
+    } else {
+        lbuf = (char*)malloc(bufsize);
+        if(lbuf == NULL) {
+            return 0;
+        }
+    }
+    
+    size_t r;
+    size_t rn = bufsize > n ? n : bufsize;
+    while((r = readfnc(lbuf, 1, rn, src)) != 0) {
+        r = writefnc(lbuf, 1, r, dest);
+        ncp += r;
+        n -= r;
+        rn = bufsize > n ? n : bufsize;
+        if(r == 0 || n == 0) {
+            break;
+        }
+    }
+    
+    if (lbuf != buf) {
+        free(lbuf);
+    }
+    
+    return ncp;
+}
+
+/* COMPARE FUNCTIONS */
+
+int ucx_cmp_str(const void *s1, const void *s2, void *data) {
+    return strcmp((const char*)s1, (const char*)s2);
+}
+
+int ucx_cmp_strn(const void *s1, const void *s2, void *n) {
+    return strncmp((const char*)s1, (const char*)s2, *((size_t*) n));
+}
+
+int ucx_cmp_sstr(const void *s1, const void *s2, void *data) {
+    sstr_t a = *(const sstr_t*) s1;
+    sstr_t b = *(const sstr_t*) s2;
+    return sstrcmp(a, b);
+}
+
+int ucx_cmp_int(const void *i1, const void *i2, void *data) {
+   int a = *((const int*) i1);
+   int b = *((const int*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_longint(const void *i1, const void *i2, void *data) {
+   long int a = *((const long int*) i1);
+   long int b = *((const long int*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_longlong(const void *i1, const void *i2, void *data) {
+   long long a = *((const long long*) i1);
+   long long b = *((const long long*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_int16(const void *i1, const void *i2, void *data) {
+   int16_t a = *((const int16_t*) i1);
+   int16_t b = *((const int16_t*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_int32(const void *i1, const void *i2, void *data) {
+   int32_t a = *((const int32_t*) i1);
+   int32_t b = *((const int32_t*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_int64(const void *i1, const void *i2, void *data) {
+   int64_t a = *((const int64_t*) i1);
+   int64_t b = *((const int64_t*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_uint(const void *i1, const void *i2, void *data) {
+   unsigned int a = *((const unsigned int*) i1);
+   unsigned int b = *((const unsigned int*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_ulongint(const void *i1, const void *i2, void *data) {
+   unsigned long int a = *((const unsigned long int*) i1);
+   unsigned long int b = *((const unsigned long int*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_ulonglong(const void *i1, const void *i2, void *data) {
+   unsigned long long a = *((const unsigned long long*) i1);
+   unsigned long long b = *((const unsigned long long*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_uint16(const void *i1, const void *i2, void *data) {
+   uint16_t a = *((const uint16_t*) i1);
+   uint16_t b = *((const uint16_t*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_uint32(const void *i1, const void *i2, void *data) {
+   uint32_t a = *((const uint32_t*) i1);
+   uint32_t b = *((const uint32_t*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_uint64(const void *i1, const void *i2, void *data) {
+   uint64_t a = *((const uint64_t*) i1);
+   uint64_t b = *((const uint64_t*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+intmax_t ucx_dist_int(const void *i1, const void *i2, void *data) {
+   intmax_t a = *((const int*) i1);
+   intmax_t b = *((const int*) i2);
+   return a - b;
+}
+
+intmax_t ucx_dist_longint(const void *i1, const void *i2, void *data) {
+   intmax_t a = *((const long int*) i1);
+   intmax_t b = *((const long int*) i2);
+   return a - b;
+}
+
+intmax_t ucx_dist_longlong(const void *i1, const void *i2, void *data) {
+   intmax_t a = *((const long long*) i1);
+   intmax_t b = *((const long long*) i2);
+   return a - b;
+}
+
+intmax_t ucx_dist_int16(const void *i1, const void *i2, void *data) {
+   intmax_t a = *((const int16_t*) i1);
+   intmax_t b = *((const int16_t*) i2);
+   return a - b;
+}
+
+intmax_t ucx_dist_int32(const void *i1, const void *i2, void *data) {
+   intmax_t a = *((const int32_t*) i1);
+   intmax_t b = *((const int32_t*) i2);
+   return a - b;
+}
+
+intmax_t ucx_dist_int64(const void *i1, const void *i2, void *data) {
+   intmax_t a = *((const int64_t*) i1);
+   intmax_t b = *((const int64_t*) i2);
+   return a - b;
+}
+
+intmax_t ucx_dist_uint(const void *i1, const void *i2, void *data) {
+   uintmax_t a = *((const unsigned int*) i1);
+   uintmax_t b = *((const unsigned int*) i2);
+   return a > b ? (intmax_t)(a - b) : -(intmax_t)(b - a);
+}
+
+intmax_t ucx_dist_ulongint(const void *i1, const void *i2, void *data) {
+   uintmax_t a = *((const unsigned long int*) i1);
+   uintmax_t b = *((const unsigned long int*) i2);
+   return a > b ? (intmax_t)(a - b) : -(intmax_t)(b - a);
+}
+
+intmax_t ucx_dist_ulonglong(const void *i1, const void *i2, void *data) {
+   uintmax_t a = *((const unsigned long long*) i1);
+   uintmax_t b = *((const unsigned long long*) i2);
+   return a > b ? (intmax_t)(a - b) : -(intmax_t)(b - a);
+}
+
+intmax_t ucx_dist_uint16(const void *i1, const void *i2, void *data) {
+   uintmax_t a = *((const uint16_t*) i1);
+   uintmax_t b = *((const uint16_t*) i2);
+   return a > b ? (intmax_t)(a - b) : -(intmax_t)(b - a);
+}
+
+intmax_t ucx_dist_uint32(const void *i1, const void *i2, void *data) {
+   uintmax_t a = *((const uint32_t*) i1);
+   uintmax_t b = *((const uint32_t*) i2);
+   return a > b ? (intmax_t)(a - b) : -(intmax_t)(b - a);
+}
+
+intmax_t ucx_dist_uint64(const void *i1, const void *i2, void *data) {
+   uintmax_t a = *((const uint64_t*) i1);
+   uintmax_t b = *((const uint64_t*) i2);
+   return a > b ? (intmax_t)(a - b) : -(intmax_t)(b - a);
+}
+
+int ucx_cmp_float(const void *f1, const void *f2, void *epsilon) {
+   float a = *((const float*) f1);
+   float b = *((const float*) f2);
+   float e = !epsilon ? 1e-6f : *((float*)epsilon);
+   if (fabsf(a - b) < e) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_double(const void *d1, const void *d2, void *epsilon) {
+   double a = *((const double*) d1);
+   double b = *((const double*) d2);
+   double e = !epsilon ? 1e-14 : *((double*)epsilon);
+   if (fabs(a - b) < e) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_cmp_ptr(const void *ptr1, const void *ptr2, void *data) {
+    const intptr_t p1 = (const intptr_t) ptr1;
+    const intptr_t p2 = (const intptr_t) ptr2;
+    if (p1 == p2) {
+        return 0;
+    } else {
+        return p1  < p2 ? -1 : 1;
+    }
+}
+
+int ucx_cmp_mem(const void *ptr1, const void *ptr2, void *n) {
+    return memcmp(ptr1, ptr2, *((size_t*)n));
+}
+
+/* PRINTF FUNCTIONS */
+
+#ifdef va_copy
+#define UCX_PRINTF_BUFSIZE 256
+#else
+#pragma message("WARNING: C99 va_copy macro not supported by this platform" \
+                " - limiting ucx_*printf to 2 KiB")
+#define UCX_PRINTF_BUFSIZE 0x800
+#endif
+
+int ucx_fprintf(void *stream, write_func wfc, const char *fmt, ...) {
+    int ret;
+    va_list ap;
+    va_start(ap, fmt);
+    ret = ucx_vfprintf(stream, wfc, fmt, ap);
+    va_end(ap);
+    return ret;
+}
+
+int ucx_vfprintf(void *stream, write_func wfc, const char *fmt, va_list ap) {
+    char buf[UCX_PRINTF_BUFSIZE];
+#ifdef va_copy
+    va_list ap2;
+    va_copy(ap2, ap);
+    int ret = vsnprintf(buf, UCX_PRINTF_BUFSIZE, fmt, ap);
+    if (ret < 0) {
+        return ret;
+    } else if (ret < UCX_PRINTF_BUFSIZE) {
+        return (int)wfc(buf, 1, ret, stream);
+    } else {
+        if (ret == INT_MAX) {
+            errno = ENOMEM;
+            return -1;
+        }
+        
+        int len = ret + 1;
+        char *newbuf = (char*)malloc(len);
+        if (!newbuf) {
+            return -1;
+        }
+        
+        ret = vsnprintf(newbuf, len, fmt, ap2);
+        if (ret > 0) {
+            ret = (int)wfc(newbuf, 1, ret, stream);
+        }
+        free(newbuf);
+    }
+    return ret;
+#else
+    int ret = vsnprintf(buf, UCX_PRINTF_BUFSIZE, fmt, ap);
+    if (ret < 0) {
+        return ret;
+    } else if (ret < UCX_PRINTF_BUFSIZE) {
+        return (int)wfc(buf, 1, ret, stream);
+    } else {
+        errno = ENOMEM;
+        return -1;
+    }
+#endif
+}
+
+sstr_t ucx_asprintf(UcxAllocator *allocator, const char *fmt, ...) {
+    va_list ap;
+    sstr_t ret;
+    va_start(ap, fmt);
+    ret = ucx_vasprintf(allocator, fmt, ap);
+    va_end(ap);
+    return ret;
+}
+
+sstr_t ucx_vasprintf(UcxAllocator *a, const char *fmt, va_list ap) {
+    sstr_t s;
+    s.ptr = NULL;
+    s.length = 0;
+    char buf[UCX_PRINTF_BUFSIZE];
+#ifdef va_copy
+    va_list ap2;
+    va_copy(ap2, ap);
+    int ret = vsnprintf(buf, UCX_PRINTF_BUFSIZE, fmt, ap);
+    if (ret > 0 && ret < UCX_PRINTF_BUFSIZE) {
+        s.ptr = (char*)almalloc(a, ret + 1);
+        if (s.ptr) {
+            s.length = (size_t)ret;
+            memcpy(s.ptr, buf, ret);
+            s.ptr[s.length] = '\0';
+        }
+    } else if (ret == INT_MAX) {
+        errno = ENOMEM;
+    } else  {
+        int len = ret + 1;
+        s.ptr = (char*)almalloc(a, len);
+        if (s.ptr) {
+            ret = vsnprintf(s.ptr, len, fmt, ap2);
+            if (ret < 0) {
+                free(s.ptr);
+                s.ptr = NULL;
+            } else {
+                s.length = (size_t)ret;
+            }
+        }
+    }
+#else
+    int ret = vsnprintf(buf, UCX_PRINTF_BUFSIZE, fmt, ap);
+    if (ret > 0 && ret < UCX_PRINTF_BUFSIZE) {
+        s.ptr = (char*)almalloc(a, ret + 1);
+        if (s.ptr) {
+            s.length = (size_t)ret;
+            memcpy(s.ptr, buf, ret);
+            s.ptr[s.length] = '\0';
+        }
+    } else {
+        errno = ENOMEM;
+    }
+#endif
+    return s;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/Makefile	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,47 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2012 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+BUILD_ROOT = ../
+include ../config.mk
+
+OBJ_DIR = ../build/
+
+include common/objs.mk
+
+UI_LIB = ../build/lib/libuitk.$(LIB_EXT)
+
+include $(TOOLKIT)/objs.mk
+OBJ = $(TOOLKITOBJS) $(COMMONOBJS)
+
+all: $(UI_LIB)
+
+include $(TOOLKIT)/Makefile
+
+$(COMMON_OBJPRE)%.o: common/%.c
+	$(CC) -o $@ -c -I../ucx $(CFLAGS) $(TK_CFLAGS) $<
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/Makefile	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,34 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2012 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+$(COCOA_OBJPRE)%.o: cocoa/%.m
+	$(CC) -o $@ -c $(CFLAGS) $<
+
+$(UI_LIB): $(OBJ)
+	$(AR) $(ARFLAGS) $(UI_LIB) $(OBJ)
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/container.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,44 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "../ui/toolkit.h"
+#import "toolkit.h"
+
+typedef void(*ui_container_add_f)(UiContainer*, NSView*);
+
+struct UiContainer {
+    NSView* widget;
+    void   (*add)(UiContainer*, NSView*);
+    NSRect (*getframe)(UiContainer*);
+};
+
+UiContainer* ui_window_container(UiObject *obj, NSWindow *window);
+
+NSRect ui_container_getframe(UiContainer *ct);
+void ui_container_add(UiContainer *ct, NSView *view);
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/container.m	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,106 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <stdio.h>
+#import <stdlib.h>
+
+#import "container.h"
+
+
+UiContainer* ui_window_container(UiObject *obj, NSWindow *window) {
+    UiContainer *ct = ucx_mempool_malloc(
+                                         obj->ctx->mempool,
+                                         sizeof(UiContainer));
+    ct->widget = [window contentView];
+    ct->add = ui_container_add;
+    ct->getframe = ui_container_getframe;
+    return ct;
+}
+
+UIWIDGET ui_sidebar(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    NSRect frame = ct->getframe(ct);
+    
+    // create and add views
+    NSSplitView *splitview = [[NSSplitView alloc] initWithFrame:frame];
+    [splitview setVertical:YES];
+    [splitview setDividerStyle:NSSplitViewDividerStyleThin];
+    ct->add(ct, splitview);
+    
+    NSRect lframe;
+    lframe.origin.x = 0;
+    lframe.origin.y = 0;
+    lframe.size.width = 200;
+    lframe.size.height = frame.size.height;
+    
+    NSRect rframe;
+    rframe.origin.x = 0;
+    rframe.origin.y = 0;
+    rframe.size.width = frame.size.width - 201;
+    rframe.size.height = frame.size.height;
+    
+    NSView *sidebar = [[NSView alloc]initWithFrame:lframe];
+    NSView *contentarea = [[NSView alloc]initWithFrame:rframe];
+    
+    [splitview addSubview:sidebar];
+    [splitview addSubview:contentarea];
+    
+    // add ui objects for the sidebar and contentarea
+    // the sidebar is added last, so that new views are added first to it
+    UiObject *left = uic_object_new(obj, sidebar);
+    UiContainer *ct1 = ucx_mempool_malloc(
+            obj->ctx->mempool,
+            sizeof(UiContainer));
+    ct1->widget = sidebar;
+    ct1->add = ui_container_add;
+    ct1->getframe = ui_container_getframe;
+    left->container = ct1;
+    
+    UiObject *right = uic_object_new(obj, sidebar);
+    UiContainer *ct2 = ucx_mempool_malloc(
+            obj->ctx->mempool,
+            sizeof(UiContainer));
+    ct2->widget = contentarea;
+    ct2->add = ui_container_add;
+    ct2->getframe = ui_container_getframe;
+    right->container = ct2;
+    
+    uic_obj_add(obj, right);
+    uic_obj_add(obj, left);
+    
+    return splitview;
+}
+
+
+NSRect ui_container_getframe(UiContainer *ct) {
+    return [ct->widget frame];
+}
+
+void ui_container_add(UiContainer *ct, NSView *view) {
+    [ct->widget addSubview: view];
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/graphics.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,52 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "../ui/graphics.h"
+#import "toolkit.h"
+
+
+@interface UiCanvas : NSView {
+    UiObject            *object;
+    ui_drawfunc         callback;
+    void                *userdata;
+}
+
+- (UiObject*) object;
+- (void) setObject:(void*)obj;
+
+- (void*) userdata;
+- (void) setUserdata:(void*)d;
+
+- (ui_drawfunc) callback;
+- (void) setCallback: (ui_drawfunc)f;
+
+
+- (void)drawRect:(NSRect)rect;
+
+@end
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/graphics.m	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,124 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <stdio.h>
+#import <stdlib.h>
+#import <string.h>
+
+#import "graphics.h"
+#import "container.h"
+#import "../common/context.h"
+
+
+
+@implementation UiCanvas
+
+- (UiObject*) object {
+    return object;
+}
+
+- (void) setObject:(void*)obj {
+    object = obj;
+}
+
+- (void*) userdata {
+    return userdata;
+}
+
+- (void) setUserdata:(void*)d {
+    userdata = d;
+}
+
+- (ui_drawfunc) callback {
+    return callback;
+}
+- (void) setCallback: (ui_drawfunc)f {
+    callback = f;
+}
+
+- (void) drawRect:(NSRect)rect {
+    UiGraphics g;
+    NSRect bounds = [self bounds];
+    g.width = bounds.size.width;
+    g.height = bounds.size.height;
+    
+    UiEvent ev;
+    ev.obj = object;
+    ev.window = object->window;
+    ev.document = object->ctx->document;
+    
+    callback(&ev, &g, userdata);
+}
+
+@end
+
+
+UIWIDGET ui_drawingarea(UiObject *obj, ui_drawfunc f, void *userdata) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    NSRect frame = ct->getframe(ct);
+    
+    UiCanvas *canvas = [[UiCanvas alloc]initWithFrame:frame];
+    [canvas setObject: obj];
+    [canvas setCallback: f];
+    [canvas setUserdata: userdata];
+    ct->add(ct, canvas);
+    
+    return canvas;
+}
+
+
+// drawing functions
+void ui_graphics_color(UiGraphics *gr, int red, int green, int blue) {
+    float r = ((float)red) / 255.f;
+    float g = ((float)green) / 255.f;
+    float b = ((float)blue) / 255.f;
+    
+    NSColor *color = [NSColor colorWithCalibratedRed:r green:g blue:b alpha:1];
+    [color set];
+}
+
+void ui_draw_rect(UiGraphics *g, int x, int y, int w, int h, int fill) {
+    // translate y
+    y = g->height - y - h;
+    
+    NSRect bounds;
+    bounds.origin.x = x;
+    bounds.origin.y = y;
+    bounds.size.width = w;
+    bounds.size.height = h;
+    
+    if(fill) {
+        NSRectFill(bounds);
+    } else {
+        NSFrameRect(bounds);
+    }
+}
+
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/menu.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,94 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "../ui/menu.h"
+#import "toolkit.h"
+#import <ucx/list.h>
+
+typedef struct UiAbstractMenuItem {
+    int  (*update)(id window, void *item);
+    void *item_data;
+} UiAbstractMenuItem;
+
+typedef struct UiMenuItem {
+    NSMenuItem  *item;
+    int         state;
+} UiMenuItem;
+
+typedef struct UiStateItem {
+    NSMenuItem  *item;
+    char        *var;
+} UiStateItem;
+
+typedef struct UiMenuItemList {
+    NSMenu      *menu;
+    NSMenuItem  *first;
+    UiList      *list;
+    int         index;
+    int         oldcount;
+    ui_callback callback;
+    void        *data;
+} UiMenuItemList;
+
+@interface UiMenuDelegate : NSObject <NSMenuDelegate> {
+    UcxList *items; // UiStateItem*
+    UcxList *itemlists; // UiMenuItemList*
+}
+
+- (void) menuNeedsUpdate:(NSMenu*) menu;
+
+- (void) addItem:(NSMenuItem*) item var: (char*)name;
+
+- (void) addList:(UiList*) list menu:(NSMenu*)menu index: (int)i callback: (ui_callback)f data:(void*) data;
+
+- (UcxList*) items;
+
+- (UcxList*) lists;
+
+@end
+
+@interface UiGroupMenuItem : NSMenuItem {
+    NSMutableArray *groups;
+}
+
+- (id)initWithTitle:(NSString*)title action:(SEL)action keyEquivalent:(NSString*)s;
+
+- (void) addGroup:(int)group;
+
+- (void) checkGroups:(int*)g count:(int)n;
+
+@end
+
+void ui_menu_init();
+UiMenuDelegate* ui_menu_delegate();
+
+int ui_menuitem_get(UiInteger *i);
+void ui_menuitem_set(UiInteger *i, int value);
+
+int ui_update_item(id window, void *data);
+int ui_update_item_list(id window, void *data);
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/menu.m	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,319 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <stdio.h>
+#import <stdlib.h>
+#import <string.h>
+#import <stdarg.h>
+
+#import "menu.h"
+#import "window.h"
+#import "stock.h"
+
+@implementation UiMenuDelegate 
+
+- (UiMenuDelegate*) init {
+    items = NULL;
+    itemlists = NULL;
+    return self;
+}
+
+- (void) menuNeedsUpdate:(NSMenu *) menu {
+    NSWindow *activeWindow = [NSApp keyWindow];
+    [(UiCocoaWindow*)activeWindow updateMenu: menu];
+}
+
+- (void) addItem:(NSMenuItem*) item var: (char*)name {
+    UiStateItem *i = malloc(sizeof(UiStateItem));
+    i->item = item;
+    i->var = name;
+    items = ucx_list_append(items, i);
+}
+
+- (void) addList:(UiList*) list menu:(NSMenu*)menu index: (int)i callback: (ui_callback)f data:(void*) data {
+    UiMenuItemList *itemList = malloc(sizeof(UiMenuItemList));
+    itemList->list = list;
+    itemList->menu = menu;
+    itemList->first = NULL;
+    itemList->index = i;
+    itemList->oldcount = 0;
+    itemList->callback = f;
+    itemList->data = data;
+    itemlists = ucx_list_append(itemlists, itemList);
+}
+
+- (UcxList*) items {
+    return items;
+}
+
+- (UcxList*) lists {
+    return itemlists;
+    
+}
+
+@end
+
+
+@implementation UiGroupMenuItem
+
+- (id)initWithTitle:(NSString*)title action:(SEL)action keyEquivalent:(NSString*)s {
+    [super initWithTitle:title action:action keyEquivalent:s];
+    groups = [[NSMutableArray alloc]initWithCapacity: 8];
+    return self;
+}
+
+- (void) addGroup:(int)group {
+    NSNumber *groupNumber = [NSNumber numberWithInteger:group];
+    [groups addObject:groupNumber];
+}
+
+- (void) checkGroups:(int*)g count:(int)n {
+    int c = [groups count];
+    
+    char *check = calloc(1, c);
+    for(int i=0;i<n;i++) {
+        for(int k=0;k<c;k++) {
+            NSNumber *groupNumber = [groups objectAtIndex:k];
+            if([groupNumber intValue] == g[i]) {
+                check[k] = 1;
+                break;
+            }
+        }
+    }
+    
+    for(int j=0;j<c;j++) {
+        if(check[j] == 0) {
+            [self setEnabled:NO];
+            return;
+        }
+    }
+    [self setEnabled:YES];
+}
+
+@end
+
+
+//static NSMenu *currentMenu = NULL;
+
+static UcxList *current;
+
+static int currentItemIndex = 0;
+static UiMenuDelegate *delegate;
+
+void ui_menu_init() {
+    delegate = [[UiMenuDelegate alloc]init];
+}
+
+UiMenuDelegate* ui_menu_delegate() {
+    return delegate;
+}
+
+
+void ui_menu(char *title) {
+    NSString *str = [[NSString alloc] initWithUTF8String:title];
+    
+    NSMenu *menu = [[NSMenu alloc] initWithTitle: str];
+    NSMenuItem *menuItem = [[NSApp mainMenu] addItemWithTitle:str
+                                                       action:nil keyEquivalent:@""];
+    [menu setDelegate: delegate];
+    [menu setAutoenablesItems:NO];
+    
+    [[NSApp mainMenu] setSubmenu:menu forItem:menuItem];
+    //currentMenu = menu;
+    currentItemIndex = 0;
+    
+    current = ucx_list_prepend(NULL, menu);
+}
+
+void ui_submenu(char *title) {
+    NSString *str = [[NSString alloc] initWithUTF8String:title];
+    NSMenu *currentMenu = current->data;
+    
+    NSMenu *menu = [[NSMenu alloc] initWithTitle: str];
+    NSMenuItem *menuItem = [currentMenu addItemWithTitle:str
+                                                       action:nil keyEquivalent:@""];
+    [menu setDelegate: delegate];
+    [menu setAutoenablesItems:NO];
+    
+    [currentMenu setSubmenu:menu forItem:menuItem];
+    //currentMenu = menu;
+    currentItemIndex = 0;
+    
+    current = ucx_list_prepend(current, menu);
+}
+
+void ui_submenu_end() {
+    if(ucx_list_size(current) < 2) {
+        return;
+    }
+    current = ucx_list_remove(current, current);
+}
+
+void ui_menuitem(char *label, ui_callback f, void *data) {
+    ui_menuitem_gr(label, f, data, -1);
+}
+
+void ui_menuitem_st(char *stockid, ui_callback f, void *data) {
+    ui_menuitem_stgr(stockid, f, data, -1);
+}
+
+void ui_menuitem_gr(char *label, ui_callback f, void *userdata, ...) {
+    // create menu item
+    EventWrapper *event = [[EventWrapper alloc]initWithData:userdata callback:f];
+    NSString *title = [[NSString alloc] initWithUTF8String:label];
+    UiGroupMenuItem *item = [[UiGroupMenuItem alloc]initWithTitle:title action:@selector(handleEvent:) keyEquivalent:@""];
+    [item setTarget:event];
+    
+    // add groups
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        [item addGroup: group];
+    }
+    va_end(ap);
+    
+    NSMenu *currentMenu = current->data;
+    [currentMenu addItem:item];
+    
+    currentItemIndex++;
+}
+
+void ui_menuitem_stgr(char *stockid, ui_callback f, void *userdata, ...) {
+    // create menu item
+    EventWrapper *event = [[EventWrapper alloc]initWithData:userdata callback:f];
+    UiStockItem *si = ui_get_stock_item(stockid);
+    UiGroupMenuItem *item = [[UiGroupMenuItem alloc]initWithTitle:si->label
+                                action:@selector(handleEvent:)
+                                keyEquivalent:si->keyEquivalent];
+    [item setTarget:event];
+    
+    // add groups
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        [item addGroup: group];
+    }
+    va_end(ap);
+    
+    NSMenu *currentMenu = current->data;
+    [currentMenu addItem:item];
+    
+    currentItemIndex++;
+}
+
+void ui_checkitem(char *label, ui_callback f, void *data) {
+    EventWrapper *event = [[EventWrapper alloc]initWithData:data callback:f];
+    NSString *str = [[NSString alloc] initWithUTF8String:label];
+    
+    NSMenu *currentMenu = current->data;
+    NSMenuItem *item = [currentMenu addItemWithTitle:str
+                                              action:@selector(handleStateEvent:) keyEquivalent:@""];
+    [item setTarget:event];
+    
+    [delegate addItem: item var:NULL];
+    currentItemIndex++;
+}
+
+void ui_checkitem_nv(char *label, char *vname) {
+    EventWrapper *event = [[EventWrapper alloc]initWithData:NULL callback:NULL];
+    NSString *str = [[NSString alloc] initWithUTF8String:label];
+    
+    NSMenu *currentMenu = current->data;
+    NSMenuItem *item = [currentMenu addItemWithTitle:str
+                                              action:@selector(handleStateEvent:) keyEquivalent:@""];
+    [item setTarget:event];
+    
+    [delegate addItem: item var:vname];
+    currentItemIndex++;
+}
+
+void ui_menuseparator() {
+    NSMenu *currentMenu = current->data;
+    [currentMenu addItem: [NSMenuItem separatorItem]];
+    currentItemIndex++;
+}
+
+void ui_menuitem_list (UiList *items, ui_callback f, void *data) {
+    NSMenu *currentMenu = current->data;
+    [delegate addList:items menu:currentMenu index:currentItemIndex callback:f data:data];
+}
+
+
+
+int ui_menuitem_get(UiInteger *i) {
+    UiMenuItem *item = i->obj;
+    i->value = [item->item state];
+    return i->value;
+}
+
+void ui_menuitem_set(UiInteger *i, int value) {
+    UiMenuItem *item = i->obj;
+    [item->item setState: value];
+    i->value = value;
+    item->state = value;
+}
+
+
+int ui_update_item(UiCocoaWindow *window, void *data) {
+    UiMenuItem *item = data;
+    [item->item setState: item->state];
+    return 0;
+}
+
+int ui_update_item_list(UiCocoaWindow *window, void *data) {
+    UiMenuItemList *itemList = data;
+    UiList *list = itemList->list;
+    
+    for(int r=0;r<itemList->oldcount;r++) {
+        [itemList->menu removeItemAtIndex:itemList->index];
+    }
+    
+    char *str = ui_list_first(list);
+    int i = itemList->index;
+    [itemList->menu insertItem: [NSMenuItem separatorItem] atIndex: i];
+    i++;
+    while(str) {
+        EventWrapper *event = [[EventWrapper alloc]initWithData:itemList->data callback:itemList->callback];
+        [event setIntval: i - itemList->index - 1];
+        
+        NSString *title = [[NSString alloc] initWithUTF8String:str];
+        NSMenuItem *item = [[NSMenuItem alloc]initWithTitle:title action:@selector(handleEvent:) keyEquivalent:@""];
+        [item setTarget:event];
+        
+        [itemList->menu insertItem:item atIndex:i];
+        
+        str = ui_list_next(list);
+        i++;
+    }
+    
+    itemList->oldcount = i - itemList->index;
+    
+    return 0;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/objs.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,45 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2012 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+COCOA_SRC_DIR = ui/cocoa/
+COCOA_OBJPRE = $(OBJ_DIR)/$(COCOA_SRC_DIR)
+
+COCOAOBJ = toolkit.o
+COCOAOBJ += window.o
+COCOAOBJ += menu.o
+COCOAOBJ += stock.o
+COCOAOBJ += toolbar.o
+COCOAOBJ += container.o
+COCOAOBJ += text.o
+COCOAOBJ += resource.o
+COCOAOBJ += tree.o
+COCOAOBJ += graphics.o
+
+
+TOOLKITOBJS += $(COCOAOBJ:%=$(COCOA_OBJPRE)%)
+TOOLKITSOURCE += $(COCOAOBJ:%.o=cocoa/%.m)
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/resource.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,32 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2012 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "../ui/toolkit.h"
+#import "../ui/properties.h"
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/resource.m	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,73 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2012 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <stdio.h>
+#import <stdlib.h>
+#import <string.h>
+
+#import "resource.h"
+#import "../common/properties.h"
+
+
+
+void ui_load_lang_def(char *locale, char *default_locale) {
+    NSString *localeString = nil;
+    char tmp[6];
+    if(!locale) {
+        NSString* lang = [[NSLocale currentLocale] localeIdentifier];
+        if(lang) {
+            localeString = lang;
+        } else {
+            [[NSString alloc]initWithUTF8String:default_locale];
+        }
+    } else {
+        localeString = [[NSString alloc]initWithUTF8String:locale];
+    }
+    
+    NSString *path = [[NSBundle mainBundle] pathForResource:localeString ofType:@"properties" inDirectory:@"locales"];
+    
+    const char *p = [path UTF8String];
+    
+    if(uic_load_language_file((char*)p)) {
+        if(default_locale) {
+            ui_load_lang_def(default_locale, NULL);
+        } else {
+            // cannot find any language file
+            fprintf(stderr, "Ui Error: Cannot load language.\n");
+            exit(-1);
+        }
+    }
+}
+
+void ui_locales_dir(char *path) {
+    // empty
+}
+
+void ui_pixmaps_dir(char *path) {
+    // empty
+}
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/stock.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,43 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2012 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "toolkit.h"
+#import "../ui/stock.h"
+#import <ucx/map.h>
+
+typedef struct UiStockItem {
+    NSString *label;
+    NSString *keyEquivalent;
+    NSImage  *image;
+} UiStockItem;
+
+void ui_stock_init();
+
+void ui_add_stock_item(char *stock_id, NSString *label, NSString *keyEquivalent, NSImage *image);
+
+UiStockItem* ui_get_stock_item(char *stock_id);
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/stock.m	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,75 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2012 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <stdio.h>
+#import <stdlib.h>
+
+#import "stock.h"
+#import "../common/properties.h"
+
+static UcxMap *stock_items;
+
+void ui_stock_init() {
+    stock_items = ucx_map_new(64);
+    
+    ui_add_stock_item(UI_STOCK_NEW, @"New", @"n", nil);
+    ui_add_stock_item(UI_STOCK_OPEN, @"Open", @"o", nil);
+    ui_add_stock_item(UI_STOCK_SAVE, @"Save", @"s", nil);
+    ui_add_stock_item(UI_STOCK_SAVE_AS, @"Save as ...", @"", nil);
+    ui_add_stock_item(UI_STOCK_CLOSE, @"Close", @"w", nil);
+    ui_add_stock_item(UI_STOCK_UNDO, @"Undo", @"z", nil);
+    ui_add_stock_item(UI_STOCK_REDO, @"Redo", @"", nil);
+    ui_add_stock_item(UI_STOCK_CUT, @"Cut", @"x", nil);
+    ui_add_stock_item(UI_STOCK_COPY, @"Copy", @"c", nil);
+    ui_add_stock_item(UI_STOCK_PASTE, @"Paste", @"v", nil);
+    ui_add_stock_item(UI_STOCK_DELETE, @"Delete", @"", nil);
+    
+    ui_add_stock_item(UI_STOCK_GO_BACK, @"Back", @"", [NSImage imageNamed: NSImageNameGoLeftTemplate]);
+    ui_add_stock_item(UI_STOCK_GO_FORWARD, @"Forward", @"", [NSImage imageNamed: NSImageNameGoRightTemplate]);
+}
+
+void ui_add_stock_item(char *stock_id, NSString *label, NSString *keyEquivalent, NSImage *image) {
+    UiStockItem *i = malloc(sizeof(UiStockItem));
+    i->label = label;
+    i->keyEquivalent = keyEquivalent;
+    i->image = image;
+    
+    ucx_map_cstr_put(stock_items, stock_id, i);
+}
+
+UiStockItem* ui_get_stock_item(char *stock_id) {
+    UiStockItem *item = ucx_map_cstr_get(stock_items, stock_id);
+    if(item) {
+        char *label = uistr_n(stock_id);
+        if(label) {
+            NSString *str = [[NSString alloc]initWithUTF8String:label];
+            item->label = str;
+        }
+    }
+    return item;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/text.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,63 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "../ui/text.h"
+#import "toolkit.h"
+#import <ucx/list.h>
+
+@interface TextChangeMgr : NSObject<NSTextViewDelegate> {
+    UiContext *context;
+    UiText    *value;
+    int       last_length;
+}
+
+- (TextChangeMgr*)initWithValue:(UiText*)text context:(UiContext*)ctx;
+
+- (NSUndoManager*)undoManagerForTextView:(NSTextView*)textview;
+
+@end
+
+#define UI_TEXTBUF_INSERT 0
+#define UI_TEXTBUF_DELETE 1
+typedef struct UiTextBufOp {
+    int  type; // UI_TEXTBUF_INSERT, UI_TEXTBUF_DELETE
+    int  start;
+    int  end;
+    int  len;
+    char *text;
+} UiTextBufOp;
+
+
+
+char* ui_textarea_get(UiText *text);
+void ui_textarea_set(UiText *text, char *str);
+char* ui_textarea_getsubstr(UiText *text, int begin, int end);
+void ui_textarea_insert(UiText *text, int pos, char *str);
+int  ui_textarea_position(UiText *text);
+void ui_textarea_selection(UiText *text, int *begin, int *end);
+int ui_textarea_length(UiText *text);
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/text.m	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,190 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <stdio.h>
+#import <stdlib.h>
+#import <string.h>
+
+#import "text.h"
+#import "container.h"
+
+@implementation TextChangeMgr
+
+- (TextChangeMgr*)initWithValue:(UiText*)text context:(UiContext*)ctx {
+    value = text;
+    context = ctx;
+    last_length = 0;
+    return self;
+}
+
+- (NSUndoManager*)undoManagerForTextView:(NSTextView*)textview {
+    return (NSUndoManager*)value->undomgr;
+}
+
+- (NSRange)textView:(NSTextView *)textview
+       willChangeSelectionFromCharacterRange:(NSRange)oldrange
+       toCharacterRange:(NSRange)newrange
+{
+    if(newrange.length != last_length) {
+        if(newrange.length == 0) {
+            ui_unset_group(context, UI_GROUP_SELECTION);
+        } else {
+            ui_set_group(context, UI_GROUP_SELECTION);
+        }
+    }
+    
+    last_length = newrange.length;
+    return newrange;
+}
+
+@end
+
+
+UIWIDGET ui_textarea(UiObject *obj, UiText *value) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    NSRect frame = ct->getframe(ct);
+    
+    NSScrollView *scrollview = [[NSScrollView alloc] initWithFrame:frame];
+    [scrollview setHasVerticalScroller:YES];
+    //[scrollvew setHasHorizontalScroller:YES];
+    [scrollview setBorderType:NSNoBorder];
+    //[scrollview setAutoresizingMask:NSViewWidthSizable|NSViewHeightSizable];
+    
+    //frame.size.width = frame.size.width - 15;
+    NSTextView *textview = [[NSTextView alloc]initWithFrame:frame];
+    [textview setAllowsUndo:TRUE];
+    [textview setAutoresizingMask:NSViewWidthSizable|NSViewHeightSizable];
+    
+    [textview setFont:[NSFont fontWithName:@"Menlo" size:12]];
+    
+    [scrollview setDocumentView:textview];
+    
+    ct->add(ct, scrollview);
+    
+    // bind value
+    if(value) {
+        value->get = ui_textarea_get;
+        value->set = ui_textarea_set;
+        value->getsubstr = ui_textarea_getsubstr;
+        value->insert = ui_textarea_insert;
+        value->position = ui_textarea_position;
+        value->selection = ui_textarea_selection;
+        value->length = ui_textarea_length;
+        value->value = NULL;
+        value->obj = textview;
+        
+        TextChangeMgr *delegate = [[TextChangeMgr alloc]initWithValue:value context:obj->ctx];
+        [textview setDelegate:delegate];
+        
+        NSUndoManager *undomgr = [[NSUndoManager alloc]init];
+        value->undomgr = undomgr;
+    }
+    
+    return textview;
+}
+
+char* ui_textarea_get(UiText *text) {
+    if(text->value) {
+        free(text->value);
+    }
+    NSTextView *textview = (NSTextView*)text->obj;
+    NSString *str = [[textview textStorage]string];
+    size_t length = [str lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
+    const char *cstr = [str UTF8String];
+    char *value = malloc(length + 1);
+    memcpy(value, cstr, length);
+    value[length] = '\0';
+    text->value = value;
+    return value;
+}
+
+void ui_textarea_set(UiText *text, char *str) {
+    if(text->value) {
+        free(text->value);
+    }
+    NSTextView *textview = (NSTextView*)text->obj;
+    NSString *s = [[NSString alloc]initWithUTF8String:str];
+    NSAttributedString *as = [[NSAttributedString alloc]initWithString:s];
+    [[textview textStorage] setAttributedString:as];
+    text->value = NULL;
+}
+
+char* ui_textarea_getsubstr(UiText *text, int begin, int end) {
+    if(text->value) {
+        free(text->value);
+    }
+    NSTextView *textview = (NSTextView*)text->obj;
+    NSString *str = [[textview textStorage]string];
+    NSRange range;
+    range.location = begin;
+    range.length = end - begin;
+    
+    NSString *substr = [str substringWithRange:range];
+    size_t length = [substr lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
+    const char *cstr = [substr UTF8String];
+    char *value = malloc(length + 1);
+    memcpy(value, cstr, length);
+    value[length] = '\0';
+    text->value = value;
+    return value;
+}
+
+void ui_textarea_insert(UiText *text, int pos, char *str) {
+    if(text->value) {
+        free(text->value);
+    }
+    NSTextView *textview = (NSTextView*)text->obj;
+    NSString *s = [[NSString alloc]initWithUTF8String:str];
+    NSAttributedString *as = [[NSAttributedString alloc]initWithString:s];
+    [[textview textStorage] insertAttributedString:as atIndex: pos];
+    text->value = NULL;
+}
+
+int ui_textarea_position(UiText *text) {
+    return [[[(NSTextView*)text->obj selectedRanges] objectAtIndex:0] rangeValue].location;
+}
+
+void ui_textarea_selection(UiText *text, int *begin, int *end) {
+    NSRange range = [[[(NSTextView*)text->obj selectedRanges] objectAtIndex:0] rangeValue];
+    *begin = range.location;
+    *end = range.location + range.length;
+}
+
+int ui_textarea_length(UiText *text) {
+    return [[(NSTextView*)text->obj textStorage] length];
+}
+
+void ui_text_undo(UiText *text) {
+    [(NSUndoManager*)text->undomgr undo];
+}
+
+void ui_text_redo(UiText *text) {
+    [(NSUndoManager*)text->undomgr redo];
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/toolbar.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,131 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "../ui/toolbar.h"
+#import "toolkit.h"
+#import <stdarg.h>
+
+
+@protocol UiToolItem
+- (NSToolbarItem *) createItem:(NSToolbar*)toolbar
+                    identifier:(NSString*)identifier
+                        object:(UiObject*)obj;
+
+- (void) addGroup:(int)group;
+
+- (UcxList*) groups;
+
+@end
+
+
+/*
+ * UiToolbarStockItem
+ *
+ * creates a toolbar item from stock description
+ */
+@interface UiToolbarStockItem : NSObject <UiToolItem> {
+    char           *name;
+    char           *stockid;
+    ui_callback    callback;
+    void           *userdata;
+    UcxList        *groups;
+    BOOL           isToggleButton;
+}
+
+- (UiToolbarStockItem*) initWithIdentifier:(char*)identifier
+                             stockID:(char*)sid
+                            callback:(ui_callback)f
+                            userdata:(void*)data;
+
+- (void) setIsToggleButton:(BOOL)t;
+
+
+@end
+
+/*
+ * UiToolbarItem
+ *
+ * toolbar item with label and icon
+ */
+@interface UiToolbarItem : NSObject <UiToolItem> {
+    char           *name;
+    char           *label;
+    // icon
+    ui_callback    callback;
+    void           *userdata;
+    UcxList        *groups;
+    BOOL           isToggleButton;
+}
+
+- (UiToolbarItem*) initWithIdentifier:(char*)identifier
+                                     label:(char*)lbl
+                                  callback:(ui_callback)f
+                                  userdata:(void*)data;
+
+- (void) setIsToggleButton:(BOOL)t;
+
+
+@end
+
+
+
+/*
+ * UiToolbarDelegate
+ */
+@interface UiToolbarDelegate : NSObject <NSToolbarDelegate> {
+    NSMutableArray      *allowedItems;
+    NSMutableArray      *defaultItems;
+    NSMutableDictionary *items;
+}
+
+- (UiToolbarDelegate*) init;
+
+- (void) addDefault:(NSString*)identifier;
+
+- (void) addItem: (NSString*) identifier
+            item: (NSObject<UiToolItem>*) item;
+
+@end
+
+
+/*
+ * UiToolbar
+ */
+@interface UiToolbar : NSToolbar {
+    UiObject *obj;
+}
+
+- (UiToolbar*) initWithObject:(UiObject*)object;
+
+- (UiObject*) object;
+
+@end
+
+void ui_toolbar_init();
+void ui_toolbar_stock_button(char *name, char *stockid, BOOL toggle, ui_callback f, void *udata, va_list ap);
+NSToolbar* ui_create_toolbar(UiObject *obj);
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/toolbar.m	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,358 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <stdio.h>
+#import <stdlib.h>
+#import <string.h>
+#import <inttypes.h>
+#import <stdarg.h>
+
+#import "toolbar.h"
+#import "window.h"
+#import "stock.h"
+
+
+static UiToolbarDelegate* toolbar_delegate;
+
+/* ---------------------      UiToolbarStockItem     --------------------- */
+
+@implementation UiToolbarStockItem
+
+- (UiToolbarStockItem*) initWithIdentifier:(char*)identifier
+                                   stockID:(char*)sid
+                                  callback:(ui_callback)f
+                                  userdata:(void*)data
+{
+    name = identifier;
+    stockid = sid;
+    callback = f;
+    userdata = data;
+    groups = NULL;
+    isToggleButton = NO;
+    return self;
+}
+
+- (void) setIsToggleButton:(BOOL)t {
+    isToggleButton = t;
+}
+
+- (void) addGroup:(int)group {
+    groups = ucx_list_append(groups, (void*)(intptr_t)group);
+}
+
+
+- (NSToolbarItem *) createItem:(NSToolbar*)toolbar
+                    identifier:(NSString*)identifier
+                        object:(UiObject*)obj
+{
+    UiStockItem *s = ui_get_stock_item(stockid);
+    if(s == nil) {
+        printf("cannot find stock item\n");
+        return nil;
+    }
+    
+    NSToolbarItem *item = [[[NSToolbarItem alloc] initWithItemIdentifier:
+                            identifier] autorelease];
+    //[item setLabel:[s label]];
+    //[item setPaletteLabel:[s label]];
+    [item setLabel:s->label];
+    [item setPaletteLabel:@"Operation"];
+    
+    // create button ...
+    NSRect frame = NSMakeRect(0, 0, 40, 22);
+    //NSSearchField *sf = [[NSSearchField alloc]initWithFrame:frame];
+    NSButton *button = [[NSButton alloc]initWithFrame:frame];
+    //[button setImage:[s buttonImage]];
+    //[button setImage:[NSImage imageNamed: NSImageNameAddTemplate]];
+    if(s->image) {
+        [button setImage:s->image];
+    } else {
+        [button setImage:[NSImage imageNamed: NSImageNameRemoveTemplate]];
+    }
+    [button setBezelStyle: NSTexturedRoundedBezelStyle];
+    
+    // event
+    EventWrapper *event = [[EventWrapper alloc]
+                           initWithData:userdata callback:callback];
+    if(isToggleButton) {
+        [button setButtonType: NSPushOnPushOffButton];
+        [button setAction:@selector(handleToggleEvent:)];
+    } else {
+        [button setAction:@selector(handleEvent:)];
+    }
+    [button setTarget:event];
+    
+    if(groups) {
+        uic_add_group_widget(obj->ctx, item, groups);
+    }
+    
+    [item setView:button];
+    return item;
+}
+
+- (UcxList*) groups {
+    return groups;
+}
+
+@end
+
+
+/* ---------------------      UiToolbarItem     --------------------- */
+
+@implementation UiToolbarItem
+
+- (UiToolbarItem*) initWithIdentifier:(char*)identifier
+                                     label:(char*)lbl
+                                  callback:(ui_callback)f
+                                  userdata:(void*)data
+{
+    name = identifier;
+    label = lbl;
+    callback = f;
+    userdata = data;
+    groups = NULL;
+    isToggleButton = NO;
+    return self;
+}
+
+- (void) setIsToggleButton:(BOOL)t {
+    isToggleButton = t;
+}
+
+- (void) addGroup:(int)group {
+    groups = ucx_list_append(groups, (void*)(intptr_t)group);
+}
+
+
+- (NSToolbarItem *) createItem:(NSToolbar*)toolbar
+                    identifier:(NSString*)identifier
+                        object:(UiObject*)obj
+{
+    NSToolbarItem *item = [[[NSToolbarItem alloc] initWithItemIdentifier:
+                            identifier] autorelease];
+    //[item setLabel:[s label]];
+    //[item setPaletteLabel:[s label]];
+    NSString *l = [[NSString alloc]initWithUTF8String:label];
+    [item setLabel:l];
+    [item setPaletteLabel:@"Operation"];
+    
+    // create button ...
+    NSRect frame = NSMakeRect(0, 0, 40, 22);
+    //NSSearchField *sf = [[NSSearchField alloc]initWithFrame:frame];
+    NSButton *button = [[NSButton alloc]initWithFrame:frame];
+    //[button setImage:[s buttonImage]];
+    //[button setImage:[NSImage imageNamed: NSImageNameAddTemplate]];
+    
+    // TODO: image
+    [button setImage:[NSImage imageNamed: NSImageNameRemoveTemplate]];
+    
+    [button setBezelStyle: NSTexturedRoundedBezelStyle];
+    
+    // event
+    EventWrapper *event = [[EventWrapper alloc]
+                           initWithData:userdata callback:callback];
+    if(isToggleButton) {
+        [button setButtonType: NSPushOnPushOffButton];
+        [button setAction:@selector(handleToggleEvent:)];
+    } else {
+        [button setAction:@selector(handleEvent:)];
+    }
+    [button setTarget:event];
+    
+    if(groups) {
+        uic_add_group_widget(obj->ctx, item, groups);
+    }
+    
+    [item setView:button];
+    return item;
+}
+
+- (UcxList*) groups {
+    return groups;
+}
+
+@end
+
+
+/* ---------------------      UiToolbarDelegate      --------------------- */
+
+@implementation UiToolbarDelegate
+
+- (UiToolbarDelegate*) init {
+    allowedItems = [[NSMutableArray alloc]initWithCapacity: 16];
+    defaultItems = [[NSMutableArray alloc]initWithCapacity: 16];
+    items = [[NSMutableDictionary alloc] init];
+    return self;
+}
+
+- (void) addDefault:(NSString*)identifier {
+    [defaultItems addObject: identifier];
+}
+
+- (void) addItem: (NSString*) identifier
+            item: (NSObject<UiToolItem>*) item
+{
+    [allowedItems addObject: identifier];
+    [items setObject: item forKey:identifier];
+}
+
+/*
+- (void) addStockItem:(char*)name
+              stockID:(char*)sid
+             callback:(ui_callback)f
+                 data:(void*)userdata
+{
+    UiToolbarStockItem *item = [[UiToolbarStockItem alloc]initWithData:name
+                                                               stockID:sid callback:f data:userdata];
+    
+    NSString *s = [[NSString alloc]initWithUTF8String:name];
+    [allowedItems addObject: s];
+    [items setObject: item forKey:s];
+}
+*/
+
+// implementation of NSToolbarDelegate methods
+- (NSArray *)toolbarAllowedItemIdentifiers:(NSToolbar *)toolbar {
+    NSMutableArray *i = [[NSMutableArray alloc]
+                         initWithCapacity:[allowedItems count] + 3];
+    [i addObject: NSToolbarFlexibleSpaceItemIdentifier];
+    [i addObject: NSToolbarSpaceItemIdentifier];
+    [i addObject: NSToolbarSeparatorItemIdentifier];
+    for(id item in allowedItems) {
+        [i addObject: item];
+    }
+    
+    return i;
+}
+
+- (NSArray *)toolbarDefaultItemIdentifiers:(NSToolbar *)toolbar {
+    return defaultItems;
+}
+
+- (NSToolbarItem *) toolbar:(NSToolbar*)toolbar
+         itemForItemIdentifier:(NSString*)identifier
+     willBeInsertedIntoToolbar:(BOOL)flag
+{
+    Protocol *item = @protocol(UiToolItem);
+    item = [items objectForKey: identifier];
+    
+    // get UiObject from toolbar
+    UiObject *obj = [(UiToolbar*)toolbar object];
+    
+    // create new NSToolbarItem
+    return [item createItem:toolbar identifier:identifier object:obj];
+}
+
+@end
+
+
+@implementation UiToolbar
+
+- (UiToolbar*) initWithObject:(UiObject*)object {
+    [self initWithIdentifier: @"MainToolbar"];
+    obj = object;
+    return self;
+}
+
+- (UiObject*) object {
+    return obj;
+}
+
+@end
+
+
+/* ---------------------          functions          --------------------- */
+
+void ui_toolbar_init() {
+    toolbar_delegate = [[UiToolbarDelegate alloc]init];
+}
+
+void ui_toolitem(char *name, char *label, ui_callback f, void *udata) {
+    UiToolbarItem *item = [[UiToolbarItem alloc]
+                                initWithIdentifier: name
+                                label: label
+                                callback: f
+                                userdata: udata];
+    
+    NSString *identifier = [[NSString alloc]initWithUTF8String:name];
+    [toolbar_delegate addItem: identifier item: item];
+}
+
+void ui_toolitem_st(char *name, char *stockid, ui_callback f, void *udata) {
+    ui_toolitem_stgr(name, stockid, f, udata, -1);
+}
+
+void ui_toolitem_stgr(char *name, char *stockid, ui_callback f, void *udata, ...) {
+    va_list ap;
+    va_start(ap, udata);
+    ui_toolbar_stock_button(name, stockid, NO, f, udata, ap);
+    va_end(ap);
+}
+
+void ui_toolitem_toggle_st(char *name, char *stockid, ui_callback f, void *udata) {
+    ui_toolitem_toggle_stgr(name, stockid, f, udata, -1);
+}
+
+void ui_toolitem_toggle_stgr(char *name, char *stockid, ui_callback f, void *udata, ...) {
+    va_list ap;
+    va_start(ap, udata);
+    ui_toolbar_stock_button(name, stockid, YES, f, udata, ap);
+    va_end(ap);
+}
+
+
+void ui_toolbar_stock_button(char *name, char *stockid, BOOL toggle, ui_callback f, void *udata, va_list ap) {
+    UiToolbarStockItem *item = [[UiToolbarStockItem alloc]
+                                initWithIdentifier: name
+                                stockID: stockid
+                                callback: f
+                                userdata: udata];
+    [item setIsToggleButton: toggle];
+    NSString *identifier = [[NSString alloc]initWithUTF8String:name];
+    [toolbar_delegate addItem: identifier item: item];
+    
+    // add groups
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        [item addGroup: group];
+    }
+}
+
+
+void ui_toolbar_add_default(char *name) {
+    NSString *identifier = [[NSString alloc]initWithUTF8String:name];
+    [toolbar_delegate addDefault: identifier];
+}
+
+NSToolbar* ui_create_toolbar(UiObject *obj) {
+    UiToolbar *toolbar = [[UiToolbar alloc] initWithObject:obj];
+    [toolbar setDelegate: toolbar_delegate];
+    [toolbar setAllowsUserCustomization: true];
+    return toolbar;
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/toolkit.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,88 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include "../ui/toolkit.h"
+#include "../common/context.h"
+#include "../common/object.h"
+
+
+@interface UiApplicationDelegate : NSObject<NSApplicationDelegate> {
+    
+}
+
+- (void)applicationWillTerminate:(NSNotification*)notification;
+
+- (BOOL)applicationShouldHandleReopen:(NSApplication *)app hasVisibleWindows:(BOOL)visible;
+
+- (BOOL)application:(NSApplication *)application openFile:(NSString *)filename;
+
+@end
+
+@interface EventWrapper : NSObject {
+    void         *data;
+    ui_callback  callback;
+    int          value;
+}
+
+- (EventWrapper*) initWithData: (void*)data callback:(ui_callback) f;
+
+- (void*) data;
+- (void) setData:(void*)d;
+- (ui_callback) callback;
+- (void) setCallback: (ui_callback)f;
+- (int) intval;
+- (void) setIntval:(int)i;
+
+- (BOOL)handleEvent:(id)sender;
+- (BOOL)handleStateEvent:(id)sender;
+- (BOOL)handleToggleEvent:(id)sender;
+
+@end
+
+@interface UiThread : NSObject {
+    UiObject      *obj;
+    ui_threadfunc job_func;
+    void          *job_data;
+    ui_callback   finish_callback;
+    void          *finish_data;
+}
+
+- (id) initWithObject:(UiObject*)object;
+- (void) setJobFunction:(ui_threadfunc)func;
+- (void) setJobData:(void*)data;
+- (void) setFinishCallback:(ui_callback)callback;
+- (void) setFinishData:(void*)data;
+
+- (void) start;
+- (void) runJob:(id)n;
+- (void) finish:(id)n;
+
+@end
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/toolkit.m	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,346 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2012 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <stdio.h>
+#import <stdlib.h>
+#import <sys/stat.h>
+#import <sys/types.h>
+#import <errno.h>
+
+#import "../common/context.h"
+#import "../common/document.h"
+#import "../common/properties.h"
+
+#import "toolkit.h"
+#import "window.h"
+#import "menu.h"
+#import "toolbar.h"
+#import "stock.h"
+
+NSAutoreleasePool *pool;
+
+static char *application_name;
+
+static ui_callback   appclose_fnc;
+static void          *appclose_udata;
+
+static ui_callback   openfile_fnc;
+static void          *openfile_udata;
+
+void ui_init(char *appname, int argc, char **argv) {
+    pool = [[NSAutoreleasePool alloc] init];
+    [NSApplication sharedApplication];
+    [NSBundle loadNibNamed:@"MainMenu" owner:NSApp];
+    
+    UiApplicationDelegate *delegate = [[UiApplicationDelegate alloc]init];
+    [NSApp setDelegate: delegate];
+    
+    
+    uic_docmgr_init();
+    ui_menu_init();
+    ui_toolbar_init();
+    ui_stock_init();
+    
+    uic_load_app_properties();
+}
+
+char* ui_appname() {
+    return application_name;
+}
+
+void ui_exitfunc(ui_callback f, void *userdata) {
+    appclose_fnc = f;
+    appclose_udata = userdata;
+}
+
+void ui_openfilefunc(ui_callback f, void *userdata) {
+    openfile_fnc = f;
+    openfile_udata = userdata;
+}
+
+void ui_show(UiObject *obj) {
+    uic_check_group_widgets(obj->ctx);
+    if([obj->widget class] == [UiCocoaWindow class]) {
+        UiCocoaWindow *window = (UiCocoaWindow*)obj->widget;
+        [window makeKeyAndOrderFront:nil];
+    } else {
+        printf("Error: ui_show: Object is not a Window!\n");
+    }
+}
+
+void ui_set_show_all(UIWIDGET widget, int value) {
+    // TODO
+}
+
+void ui_set_visible(UIWIDGET widget, int visible) {
+    // TODO
+}
+
+void ui_set_enabled(UIWIDGET widget, int enabled) {
+    [(id)widget setEnabled: enabled];
+}
+
+
+
+void ui_job(UiObject *obj, ui_threadfunc tf, void *td, ui_callback f, void *fd) {
+    UiThread *thread = [[UiThread alloc]initWithObject:obj];
+    [thread setJobFunction:tf];
+    [thread setJobData:td];
+    [thread setFinishCallback:f];
+    [thread setFinishData:fd];
+    [thread start];
+}
+
+void ui_main() {
+    [NSApp run];
+    [pool release];
+}
+
+
+void ui_clipboard_set(char *str) {
+    NSString *string = [[NSString alloc] initWithUTF8String:str];
+    NSPasteboard * pasteBoard = [NSPasteboard generalPasteboard];
+    [pasteBoard declareTypes:[NSArray arrayWithObject:NSStringPboardType] owner:nil];
+    [pasteBoard setString:string forType:NSStringPboardType];
+}
+
+char* ui_clipboard_get() {
+    NSPasteboard * pasteBoard = [NSPasteboard generalPasteboard];
+    NSArray *classes = [[NSArray alloc] initWithObjects:[NSString class], nil];
+    NSDictionary *options = [NSDictionary dictionary];
+    NSArray *data = [pasteBoard readObjectsForClasses:classes options:options];
+    
+    if(data != nil) {
+        NSString *str = [data componentsJoinedByString: @""];
+        
+        // copy C string
+        size_t length = [str lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
+        const char *cstr = [str UTF8String];
+        char *value = malloc(length + 1);
+        memcpy(value, cstr, length);
+        value[length] = '\0';
+        
+        return value;
+    } else {
+        return NULL;
+    }
+}
+
+
+@implementation UiApplicationDelegate
+
+- (void)applicationWillTerminate:(NSNotification*)notification {
+    printf("terminate\n");
+}
+
+- (BOOL)applicationShouldHandleReopen:(NSApplication *)app hasVisibleWindows:(BOOL)visible; {
+    if(!visible) {
+        printf("reopen\n");
+    }
+    return NO;
+}
+
+- (BOOL)application:(NSApplication*)application openFile:(NSString*)filename {
+    if(openfile_fnc) {
+        UiEvent event;
+        event.obj = NULL;
+        event.document = NULL;
+        event.window = NULL;
+        event.eventdata = (void*)[filename UTF8String];
+        event.intval = 0;
+        openfile_fnc(&event, openfile_udata);
+    }
+    
+    return NO;
+}
+
+@end
+
+
+@implementation EventWrapper
+
+- (EventWrapper*) initWithData: (void*)d callback:(ui_callback) f {
+    data = d;
+    callback = f;
+    value = 0;
+    return self;
+}
+
+
+- (void*) data {
+    return data;
+}
+
+- (void) setData:(void*)d {
+    data = d;
+}
+
+
+- (ui_callback) callback {
+    return callback;
+}
+
+- (void) setCallback: (ui_callback)f {
+    callback = f;
+}
+
+- (int) intval {
+    return value;
+}
+
+- (void) setIntval:(int)i {
+    value = i;
+}
+
+
+- (BOOL)handleEvent:(id)sender {
+    NSWindow *activeWindow = [NSApp keyWindow];
+    
+    UiEvent event;
+    event.eventdata = NULL;
+    if([activeWindow class] == [UiCocoaWindow class]) {
+        event.obj = [(UiCocoaWindow*)activeWindow object];
+        event.window = event.obj->window;
+        event.document = event.obj->ctx->document;
+        event.intval = value;
+    }
+    if(callback) {
+        callback(&event, data);
+    }
+    
+    return true;
+}
+
+- (BOOL)handleStateEvent:(id)sender {
+    NSWindow *activeWindow = [NSApp keyWindow];
+    int state = [sender state] ? NSOffState : NSOnState;
+    
+    UiEvent event;
+    event.intval = state;
+    event.eventdata = NULL;
+    if([activeWindow class] == [UiCocoaWindow class]) {
+        event.obj = [(UiCocoaWindow*)activeWindow object];
+        event.window = event.obj->window;
+        event.document = event.obj->ctx->document;
+        // if the sender is a menu item, we have to save the state for this
+        // window
+        UiMenuItem *wmi = [(UiCocoaWindow*)activeWindow getMenuItem: sender];
+        if(wmi) {
+            // update state in window data
+            wmi->state = state;
+        }
+    } else {
+        event.window = NULL;
+        event.document = NULL;
+    }
+    if(callback) {
+        callback(&event, data);
+    }
+    [sender setState: state];
+    
+    return true;
+}
+
+- (BOOL)handleToggleEvent:(id)sender {
+    NSWindow *activeWindow = [NSApp keyWindow];
+    
+    UiEvent event;
+    event.intval = [sender state];
+    event.eventdata = NULL;
+    if([activeWindow class] == [UiCocoaWindow class]) {
+        event.obj = [(UiCocoaWindow*)activeWindow object];
+        event.window = event.obj->window;
+        event.document = event.obj->ctx->document;
+    } else {
+        event.window = NULL;
+        event.document = NULL;
+    }
+    if(callback) {
+        callback(&event, data);
+    }
+    
+    return true;
+}
+
+@end
+
+@implementation UiThread
+
+- (id) initWithObject:(UiObject*)object {
+    obj = object;
+    job_func = NULL;
+    job_data = NULL;
+    finish_callback = NULL;
+    finish_data = NULL;
+    return self;
+}
+
+- (void) setJobFunction:(ui_threadfunc)func {
+    job_func = func;
+}
+
+- (void) setJobData:(void*)data {
+    job_data = data;
+}
+
+- (void) setFinishCallback:(ui_callback)callback {
+    finish_callback = callback;
+}
+
+- (void) setFinishData:(void*)data {
+    finish_data = data;
+}
+
+- (void) start {
+    [NSThread detachNewThreadSelector:@selector(runJob:)
+                             toTarget:self
+                           withObject:nil];
+}
+
+- (void) runJob:(id)n {
+    int result = job_func(job_data);
+    if(!result) {
+        [self performSelectorOnMainThread:@selector(finish:)
+                               withObject:nil
+                            waitUntilDone:NO];
+    }
+}
+
+- (void) finish:(id)n {
+    UiEvent event;
+    event.obj = obj;
+    event.window = obj->window;
+    event.document = obj->ctx->document;
+    event.eventdata = NULL;
+    event.intval = 0;
+    finish_callback(&event, finish_data);
+}
+
+@end
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/tree.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,47 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2012 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+ 
+ #import "../ui/tree.h"
+ #import "toolkit.h"
+ 
+ 
+@interface UiTableDataSource : NSObject<NSTableViewDataSource, NSTableViewDelegate> {
+    UiList          *data;
+    UiModelInfo     *info;
+    UiListSelection *lastSelection;
+}
+
+- (id)initWithData:(UiList*)list modelInfo:(UiModelInfo*)modelinfo;
+
+- (void)handleDoubleAction:(id)sender;
+
+@end
+
+
+char* ui_type_to_string(UiModelType type, void *data, BOOL *free);
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/tree.m	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,246 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2012 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+ 
+#import <stdio.h>
+#import <stdlib.h>
+ 
+#import "tree.h"
+#import "container.h"
+#import "window.h"
+#import "../common/context.h"
+#import <ucx/utils.h>
+
+@implementation UiTableDataSource
+
+- (id)initWithData:(UiList*)list modelInfo:(UiModelInfo*)modelinfo {
+    data = list;
+    info = modelinfo;
+    lastSelection = NULL;
+    return self;
+}
+
+- (NSInteger)numberOfRowsInTableView:(NSTableView *)tableview {
+    return data->count(data);
+}
+
+- (id)tableView:                  (NSTableView*)tableview
+        objectValueForTableColumn:(NSTableColumn*)column
+                              row:(NSInteger)row
+{
+    int column_index = [[column identifier]intValue];
+    
+    void *row_data = data->get(data, row);
+    void *cell_data = info->getvalue(row_data, column_index);
+    
+    BOOL f = false;
+    char *str = ui_type_to_string(info->types[column_index], cell_data, &f);
+    NSString *s = [[NSString alloc]initWithUTF8String:str];
+    return s;
+}
+
+- (void)tableView:(NSTableView *)tableview
+        setObjectValue:(id)object
+        forTableColumn:(NSTableColumn *)column
+                   row:(NSInteger)row
+{
+    int column_index = [[column identifier]intValue];
+    
+    // TODO
+}
+
+- (void)tableViewSelectionDidChange:(NSNotification *)notification {
+    NSTableView *tableview = (NSTableView*)notification.object;
+    
+    // create selection object
+    UiListSelection *selection = malloc(sizeof(UiListSelection));
+    selection->count = [tableview numberOfSelectedRows];
+    
+    selection->rows = calloc(selection->count, sizeof(int));
+    NSIndexSet *indices = [tableview selectedRowIndexes];
+    NSUInteger index = [indices firstIndex];
+    int i=0;
+    while (index!=NSNotFound) {
+        selection->rows[i] = index;
+        index = [indices indexGreaterThanIndex:index];
+        i++;
+    }
+    
+    // create event object
+    UiEvent event;
+    NSWindow *activeWindow = [NSApp keyWindow];
+    if([activeWindow class] == [UiCocoaWindow class]) {
+        event.obj = [(UiCocoaWindow*)activeWindow object];
+        event.window = event.obj->window;
+        event.document = event.obj->ctx->document;
+    } else {
+        event.window = NULL;
+        event.document = NULL;
+    }
+    event.eventdata = selection;
+    event.intval = selection->count == 0 ? -1 : selection->rows[0];
+    
+    // callback
+    info->selection(&event, info->userdata);
+    
+    // cleanup
+    if(lastSelection) {
+        free(lastSelection->rows);
+        free(lastSelection);
+    }
+    lastSelection = selection;
+}
+
+- (void)handleDoubleAction:(id)sender {
+    // create event object
+    UiEvent event;
+    NSWindow *activeWindow = [NSApp keyWindow];
+    if([activeWindow class] == [UiCocoaWindow class]) {
+        event.obj = [(UiCocoaWindow*)activeWindow object];
+        event.window = event.obj->window;
+        event.document = event.obj->ctx->document;
+    } else {
+        event.window = NULL;
+        event.document = NULL;
+    }
+    event.eventdata = lastSelection;
+    event.intval = lastSelection->count == 0 ? -1 : lastSelection->rows[0];
+    
+    info->activate(&event, info->userdata);
+}
+
+- (BOOL)tableView:(NSTableView *)tableview isGroupRow:(NSInteger)row {
+    return NO;
+}
+
+@end
+
+
+UIWIDGET ui_table(UiObject *obj, UiList *model, UiModelInfo *modelinfo) {
+    UiContainer *ct = uic_get_current_container(obj);
+    NSRect frame = ct->getframe(ct);
+    
+    NSScrollView *scrollview = [[NSScrollView alloc] initWithFrame:frame];
+    [scrollview setHasVerticalScroller:YES];
+    //[scrollvew setHasHorizontalScroller:YES];
+    [scrollview setBorderType:NSNoBorder];
+    //[scrollview setAutoresizingMask:NSViewWidthSizable|NSViewHeightSizable];
+    
+    NSTableView *tableview = [[NSTableView alloc]initWithFrame:frame];
+    [scrollview setDocumentView:tableview];
+    [tableview setAllowsMultipleSelection: YES];
+    //[tableview setSelectionHighlightStyle:NSTableViewSelectionHighlightStyleSourceList];
+    
+    // add columns
+    for(int i=0;i<modelinfo->columns;i++) {
+        NSString *cid = [[NSString alloc]initWithFormat: @"%d", i];
+        NSTableColumn *column = [[NSTableColumn alloc]initWithIdentifier:cid];
+        
+        NSString *title = [[NSString alloc]initWithUTF8String: modelinfo->titles[i]];
+        [[column headerCell] setStringValue:title];
+        
+        [tableview addTableColumn:column];
+    }
+    
+    UiTableDataSource *source = [[UiTableDataSource alloc]initWithData:model modelInfo:modelinfo];
+    [tableview setDataSource:source];
+    [tableview setDelegate:source];
+
+    [tableview setDoubleAction:@selector(handleDoubleAction:)];
+    [tableview setTarget:source];
+    
+    
+    ct->add(ct, scrollview);
+    return scrollview;
+}
+
+
+UIWIDGET ui_listview_var(UiObject *obj, UiListPtr *list, ui_model_getvalue_f getvalue, ui_callback f, void *udata) {
+    UiContainer *ct = uic_get_current_container(obj);
+    NSRect frame = ct->getframe(ct);
+    
+    NSScrollView *scrollview = [[NSScrollView alloc] initWithFrame:frame];
+    [scrollview setHasVerticalScroller:YES];
+    
+    [scrollview setBorderType:NSNoBorder];
+    
+    NSTableView *tableview = [[NSTableView alloc]initWithFrame:frame];
+    [scrollview setDocumentView:tableview];
+    [tableview setAllowsMultipleSelection: NO];
+    
+    // add single column
+    NSTableColumn *column = [[NSTableColumn alloc]initWithIdentifier:@"c"];
+    [tableview addTableColumn:column];
+    
+    // create model info
+    UiModelInfo *modelinfo = ui_model_info(obj->ctx, UI_STRING, -1);
+    
+    // add source
+    UiTableDataSource *source = [[UiTableDataSource alloc]initWithData:list->list modelInfo:modelinfo];
+    
+    [tableview setDataSource:source];
+    [tableview setDelegate:source];
+
+    [tableview setDoubleAction:@selector(handleDoubleAction:)];
+    [tableview setTarget:source];
+    
+    ct->add(ct, scrollview);
+    return scrollview;
+}
+
+UIWIDGET ui_listview(UiObject *obj, UiList *list, ui_model_getvalue_f getvalue, ui_callback f, void *udata) {
+    UiListPtr *listptr = ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiListPtr));
+    listptr->list = list;
+    return ui_listview_var(obj, listptr, getvalue, f, udata);
+}
+
+UIWIDGET ui_listview_nv(UiObject *obj, char *varname, ui_model_getvalue_f getvalue, ui_callback f, void *udata) {
+    UiVar *var = uic_connect_var(obj->ctx, varname, UI_VAR_LIST);
+    if(var) {
+        UiListVar *value = var->value;
+        return ui_listview_var(obj, value->listptr, getvalue, f, udata);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+
+// TODO: motif code duplicate
+char* ui_type_to_string(UiModelType type, void *data, BOOL *free) {
+    switch(type) {
+        case UI_STRING: *free = FALSE; return data;
+        case UI_INTEGER: {
+            *free = TRUE;
+            int *val = data;
+            sstr_t str = ucx_asprintf(ucx_default_allocator(), "%d", *val);
+            return str.ptr;
+        }
+    }
+    *free = FALSE;
+    return NULL;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/window.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,52 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2012 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <Cocoa/Cocoa.h>
+#import "../ui/window.h"
+#import <ucx/list.h>
+#import <ucx/map.h>
+
+#import "menu.h"
+
+
+
+@interface UiCocoaWindow : NSWindow {
+    UiObject *uiobj;
+    UcxMap   *menus; // key: NSMenu value: UcxList of UiMenuItem
+    UcxMap   *items; // key: NSMenuItem value: UiMenuItem
+}
+
+- (UiCocoaWindow*) init: (NSRect)frame object: (UiObject*)obj;
+- (UiObject*) object;
+- (void) setObject:(UiObject*)obj;
+- (void) setMenuItems:(UcxList*)menuItems;
+- (void) setMenuItemLists:(UcxList*)itemLists;
+- (UiMenuItem*) getMenuItem:(NSMenuItem*)item;
+- (void) updateMenu:(NSMenu*)menu;
+
+@end
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/cocoa/window.m	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,220 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2012 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#import "window.h"
+#import "menu.h"
+#import "toolbar.h"
+#import "container.h"
+#import <ucx/mempool.h>
+#import "../common/context.h"
+
+static int window_default_width = 600;
+static int window_default_height = 500;
+
+@implementation UiCocoaWindow
+
+- (UiCocoaWindow*) init: (NSRect)frame object: (UiObject*)obj {
+    self = [self initWithContentRect:frame
+                           styleMask:NSTitledWindowMask |
+                                     NSResizableWindowMask |
+                                     NSClosableWindowMask |
+                                     NSMiniaturizableWindowMask
+                             backing:NSBackingStoreBuffered
+                               defer:false];
+    
+    uiobj = obj;
+    UcxAllocator *allocator = uiobj->ctx->mempool->allocator;
+    menus = ucx_map_new_a(allocator, 8);
+    items = ucx_map_new_a(allocator, 64);
+    
+    return self;
+}
+
+- (UiObject*) object {
+    return uiobj;
+}
+
+- (void)  setObject:(UiObject*)obj {
+    uiobj = obj;
+}
+
+- (void) setMenuItems:(UcxList*)menuItems {
+    UcxAllocator *allocator = uiobj->ctx->mempool->allocator;
+    
+    UCX_FOREACH(elm, menuItems) {
+        UiStateItem *item = elm->data;
+        NSMenu *menu = [item->item menu];
+        
+        // create UiMenuItem which represents an NSMenuItem for a Window
+        UiMenuItem *windowItem = ucx_mempool_malloc(uiobj->ctx->mempool, sizeof(UiMenuItem));
+        windowItem->item = item->item;
+        windowItem->state = 0;
+        if(item->var) {
+            // bind value
+            UiVar *var = uic_connect_var(uiobj->ctx, item->var, UI_VAR_INTEGER);
+            if(var) {
+                UiInteger *value = var->value;
+                value->obj = windowItem;
+                value->get = ui_menuitem_get;
+                value->set = ui_menuitem_set;
+                value = 0;
+            } else {
+                // TODO: error
+            }
+        }
+        
+        // add item
+        UiAbstractMenuItem *abstractItem = malloc(sizeof(UiAbstractMenuItem));
+        abstractItem->update = ui_update_item;
+        abstractItem->item_data = windowItem;
+        UcxList *itemList = ucx_map_get(menus, ucx_key(&menu, sizeof(void*)));
+        itemList = ucx_list_append_a(allocator, itemList, abstractItem);
+        ucx_map_put(menus, ucx_key(&menu, sizeof(void*)), itemList);
+        
+        ucx_map_put(items, ucx_key(&windowItem->item, sizeof(void*)), windowItem);
+    }
+}
+
+- (void) setMenuItemLists:(UcxList*)itemLists {
+    UcxAllocator *allocator = uiobj->ctx->mempool->allocator;
+    
+    UCX_FOREACH(elm, itemLists) {
+        UiMenuItemList *list = elm->data;
+        
+        UiAbstractMenuItem *abstractItem = malloc(sizeof(UiAbstractMenuItem));
+        abstractItem->update = ui_update_item_list;
+        abstractItem->item_data = list;
+        
+        UcxList *itemList = ucx_map_get(menus, ucx_key(&list->menu, sizeof(void*)));
+        itemList = ucx_list_append_a(allocator, itemList, abstractItem);
+        ucx_map_put(menus, ucx_key(&list->menu, sizeof(void*)), itemList);
+        
+    }
+}
+
+- (UiMenuItem*) getMenuItem:(NSMenuItem*)item {
+    return ucx_map_get(items, ucx_key(&item, sizeof(void*)));
+}
+
+- (void) updateMenu:(NSMenu*)menu {
+    UcxList *itemList = ucx_map_get(menus, ucx_key(&menu, sizeof(void*)));
+    UCX_FOREACH(elm, itemList) {
+        UiAbstractMenuItem *item = elm->data;
+        item->update(self, item->item_data);
+    }
+    
+    // update group items
+    // TODO: use only one loop for all items
+    int ngroups = 0;
+    int *groups = ui_active_groups(uiobj->ctx, &ngroups);
+    
+    NSArray *groupItems = [menu itemArray];
+    int count = [groupItems count];
+    for(int i=0;i<count;i++) {
+        id item = [groupItems objectAtIndex:i];
+        if([item class] == [UiGroupMenuItem class]) {
+            [item checkGroups: groups count:ngroups];
+        }
+    }
+    free(groups);
+}
+
+@end
+
+
+/* ------------------------------ public API ------------------------------ */
+
+UiObject* ui_window(char *title, void *window_data) {
+    UcxMempool *mp = ucx_mempool_new(256);
+    UiObject *obj = ucx_mempool_calloc(mp, 1, sizeof(UiObject));
+    obj->ctx = uic_context(obj, mp);
+    
+    // create native window
+    NSRect frame = NSMakeRect(
+                              300,
+                              200,
+                              window_default_width,
+                              window_default_height);
+    
+    /*
+    UiCocoaWindow *window = [[UiCocoaWindow alloc] initWithContentRect:frame
+                                styleMask:NSTitledWindowMask | NSResizableWindowMask |
+                                NSClosableWindowMask | NSMiniaturizableWindowMask
+                                backing:NSBackingStoreBuffered
+                                defer:false];
+    */
+    UiCocoaWindow *window = [[UiCocoaWindow alloc] init:frame object:obj];
+    
+    NSString *titleStr = [[NSString alloc] initWithUTF8String:title];
+    [window setTitle:titleStr];
+    
+    UiMenuDelegate *menuDelegate = ui_menu_delegate();
+    [window setMenuItems: [menuDelegate items]];
+    [window setMenuItemLists: [menuDelegate lists]];
+    
+    NSToolbar *toolbar = ui_create_toolbar(obj);
+    [window setToolbar: toolbar];
+    
+    obj->widget = (NSView*)window;
+    obj->window = window_data;
+    obj->container = ui_window_container(obj, window);
+    
+    
+    return obj;
+}
+
+void ui_close(UiObject *obj) {
+    // TODO
+}
+
+char* ui_openfiledialog(UiObject *obj) {
+    NSOpenPanel* op = [NSOpenPanel openPanel];
+    if ([op runModal] == NSOKButton) {
+        NSArray *urls = [op URLs];
+        NSURL *url = [urls objectAtIndex:0];
+        
+        const char *str = [[url path] UTF8String];
+        return (char*)strdup(str);
+    }
+    return NULL;
+}
+
+char* ui_savefiledialog(UiObject *obj) {
+    NSSavePanel* sp = [NSSavePanel savePanel];
+    if ([sp runModal] == NSOKButton) {
+        NSURL *url = [sp URL];
+        
+        const char *str = [[url path] UTF8String];
+        return (char*)strdup(str);
+    }
+    return NULL;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/context.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,492 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include "context.h"
+#include "../ui/window.h"
+#include "document.h"
+#include "types.h"
+
+
+UiContext* uic_context(UiObject *toplevel, UcxMempool *mp) {
+    UiContext *ctx = ucx_mempool_malloc(mp, sizeof(UiContext));
+    memset(ctx, 0, sizeof(UiContext));
+    ctx->mempool = mp;
+    ctx->obj = toplevel;
+    ctx->vars = ucx_map_new_a(mp->allocator, 16);
+    
+    ctx->attach_document = uic_context_attach_document;
+    ctx->detach_document2 = uic_context_detach_document2;
+    
+#ifdef UI_GTK
+    if(toplevel->widget) {
+        ctx->accel_group = gtk_accel_group_new();
+        gtk_window_add_accel_group(GTK_WINDOW(toplevel->widget), ctx->accel_group);
+    }
+#endif
+    
+    return ctx;
+}
+
+UiContext* uic_root_context(UiContext *ctx) {
+    return ctx->parent ? uic_root_context(ctx->parent) : ctx;
+}
+
+void uic_context_attach_document(UiContext *ctx, void *document) {
+    ctx->documents = ucx_list_append_a(ctx->mempool->allocator, ctx->documents, document);
+    ctx->document = ctx->documents->data;
+    
+    UiContext *doc_ctx = ui_document_context(document);
+    
+    // check if any parent context has an unbound variable with the same name
+    // as any document variable
+    UiContext *var_ctx = ctx;
+    while(var_ctx) {
+        if(var_ctx->vars_unbound && var_ctx->vars_unbound->count > 0) {
+            UcxMapIterator i = ucx_map_iterator(var_ctx->vars_unbound);
+            UiVar *var;
+            // rmkeys holds all keys, that shall be removed from vars_unbound
+            UcxKey *rmkeys = calloc(var_ctx->vars_unbound->count, sizeof(UcxKey));
+            size_t numkeys = 0;
+            UCX_MAP_FOREACH(key, var, i) {
+                UiVar *docvar = ucx_map_get(doc_ctx->vars, key);
+                if(docvar) {
+                    // bind var to document var
+                    uic_copy_binding(var, docvar, TRUE);
+                    rmkeys[numkeys++] = key; // save the key for removal
+                }
+            }
+            // now that we may have bound some vars to the document,
+            // we can remove them from the unbound map
+            for(size_t k=0;k<numkeys;k++) {
+                ucx_map_remove(var_ctx->vars_unbound, rmkeys[k]);
+            }
+        }
+        
+        var_ctx = ctx->parent;
+    }
+}
+
+static void uic_context_unbind_vars(UiContext *ctx) {
+    UcxMapIterator i = ucx_map_iterator(ctx->vars);
+    UiVar *var;
+    UCX_MAP_FOREACH(key, var, i) {
+        if(var->from && var->from_ctx) {
+            uic_save_var2(var);
+            uic_copy_binding(var, var->from, FALSE);
+            ucx_map_put(var->from_ctx->vars_unbound, key, var->from);
+            var->from_ctx = ctx;
+        }
+    }
+    
+    UCX_FOREACH(elm, ctx->documents) {
+        UiContext *subctx = ui_document_context(elm->data);
+        uic_context_unbind_vars(subctx);
+    }
+}
+
+void uic_context_detach_document2(UiContext *ctx, void *document) {
+    // find the document in the documents list
+    UcxList *doc = NULL;
+    UCX_FOREACH(elm, ctx->documents) {
+        if(elm->data == document) {
+            doc = elm;
+            break;
+        }
+    }
+    if(!doc) {
+        return; // document is not a subdocument of this context
+    }
+    
+    ctx->documents = ucx_list_remove_a(ctx->mempool->allocator, ctx->documents, doc);
+    ctx->document = ctx->documents ? ctx->documents->data : NULL;
+    
+    UiContext *docctx = ui_document_context(document);
+    uic_context_unbind_vars(docctx); // unbind all doc/subdoc vars from the parent
+}
+
+void uic_context_detach_all(UiContext *ctx) {
+    UcxList *ls = ucx_list_clone(ctx->documents, NULL, NULL);
+    UCX_FOREACH(elm, ls) {
+        ctx->detach_document2(ctx, elm->data);
+    }
+    ucx_list_free(ls);
+}
+
+static UiVar* ctx_getvar(UiContext *ctx, UcxKey key) {
+    UiVar *var = ucx_map_get(ctx->vars, key);
+    if(!var) {
+        UCX_FOREACH(elm, ctx->documents) {
+            UiContext *subctx = ui_document_context(elm->data);
+            var = ctx_getvar(subctx, key);
+            if(var) {
+                break;
+            }
+        }
+    }
+    return var;
+}
+
+UiVar* uic_get_var(UiContext *ctx, char *name) {
+    UcxKey key = ucx_key(name, strlen(name));
+    return ctx_getvar(ctx, key);
+}
+
+UiVar* uic_create_var(UiContext *ctx, char *name, UiVarType type) {
+    UiVar *var = uic_get_var(ctx, name);
+    if(var) {
+        if(var->type == type) {
+            return var;
+        } else {
+            fprintf(stderr, "UiError: var '%s' already bound with different type\n", name);
+        }
+    }
+    
+    var = ui_malloc(ctx, sizeof(UiVar));
+    var->type = type;
+    var->value = uic_create_value(ctx, type);
+    var->from = NULL;
+    var->from_ctx = ctx;
+
+    if(!ctx->vars_unbound) {
+        ctx->vars_unbound = ucx_map_new_a(ctx->mempool->allocator, 16);
+    }
+    ucx_map_cstr_put(ctx->vars_unbound, name, var);
+    
+    return var;
+}
+
+void* uic_create_value(UiContext *ctx, UiVarType type) {
+    void *val = NULL;
+    switch(type) {
+        case UI_VAR_SPECIAL: break;
+        case UI_VAR_INTEGER: {
+            val = ui_int_new(ctx, NULL);
+            break;
+        }
+        case UI_VAR_DOUBLE: {
+            val = ui_double_new(ctx, NULL);
+            break;
+        }
+        case UI_VAR_STRING: {
+            val = ui_string_new(ctx, NULL);
+            break;
+        }
+        case UI_VAR_TEXT: {
+            val = ui_text_new(ctx, NULL);
+            break;
+        }
+        case UI_VAR_LIST: {
+            val = ui_list_new(ctx, NULL);
+            break;
+        }
+        case UI_VAR_RANGE: {
+            val = ui_range_new(ctx, NULL);
+            break;
+        }
+    }
+    return val;
+}
+
+void uic_copy_binding(UiVar *from, UiVar *to, UiBool copytodoc) {
+    // check type
+    if(from->type != to->type) {
+        fprintf(stderr, "UI Error: var has incompatible type.\n");
+        return;
+    }
+    
+    void *fromvalue = from->value;
+    // update var
+    if(copytodoc) {
+        to->from = from;
+        to->from_ctx = from->from_ctx;
+    }
+    
+    // copy binding
+    // we don't copy the observer, because the from var has never one
+    switch(from->type) {
+        default: fprintf(stderr, "uic_copy_binding: wtf!\n"); break;
+        case UI_VAR_SPECIAL: break;
+        case UI_VAR_INTEGER: {
+            UiInteger *f = fromvalue;
+            UiInteger *t = to->value;
+            if(!f->obj) break;
+            uic_int_copy(f, t);
+            t->set(t, t->value);
+            break;
+        }
+        case UI_VAR_DOUBLE: {
+            UiDouble *f = fromvalue;
+            UiDouble *t = to->value;
+            if(!f->obj) break;
+            uic_double_copy(f, t);
+            t->set(t, t->value);
+            break;
+        }
+        case UI_VAR_STRING: {
+            UiString *f = fromvalue;
+            UiString *t = to->value;
+            if(!f->obj) break;
+            uic_string_copy(f, t);
+            char *tvalue = t->value.ptr ? t->value.ptr : "";
+            t->set(t, tvalue);
+            break;
+        }
+        case UI_VAR_TEXT: {
+            UiText *f = fromvalue;
+            UiText *t = to->value;
+            if(!f->obj) break;
+            uic_text_copy(f, t);
+            char *tvalue = t->value.ptr ? t->value.ptr : "";
+            t->set(t, tvalue);
+            t->setposition(t, t->pos);
+            break;
+        }
+        case UI_VAR_LIST: {
+            UiList *f = fromvalue;
+            UiList *t = to->value;
+            if(!f->obj) break;
+            uic_list_copy(f, t);
+            t->update(t, -1);
+            break;
+        }
+        case UI_VAR_RANGE: {
+            UiRange *f = fromvalue;
+            UiRange *t = to->value;
+            if(!f->obj) break;
+            uic_range_copy(f, t);
+            t->setextent(t, t->extent);
+            t->setrange(t, t->min, t->max);
+            t->set(t, t->value);
+            break;
+        }
+    }
+}
+
+void uic_save_var2(UiVar *var) {
+    switch(var->type) {
+        case UI_VAR_SPECIAL: break;
+        case UI_VAR_INTEGER: uic_int_save(var->value); break;
+        case UI_VAR_DOUBLE: uic_double_save(var->value); break;
+        case UI_VAR_STRING: uic_string_save(var->value); break;
+        case UI_VAR_TEXT: uic_text_save(var->value); break;
+        case UI_VAR_LIST: break;
+        case UI_VAR_RANGE: uic_range_save(var->value); break;
+    }
+}
+
+void uic_unbind_var(UiVar *var) {
+    switch(var->type) {
+        case UI_VAR_SPECIAL: break;
+        case UI_VAR_INTEGER: uic_int_unbind(var->value); break;
+        case UI_VAR_DOUBLE: uic_double_unbind(var->value); break;
+        case UI_VAR_STRING: uic_string_unbind(var->value); break;
+        case UI_VAR_TEXT: uic_text_unbind(var->value); break;
+        case UI_VAR_LIST: uic_list_unbind(var->value); break;
+        case UI_VAR_RANGE: uic_range_unbind(var->value); break;
+    }
+}
+
+void uic_reg_var(UiContext *ctx, char *name, UiVarType type, void *value) {
+    // TODO: do we need/want this? Why adding vars to a context after
+    // widgets reference these? Workarounds:
+    // 1. add vars to ctx before creating ui
+    // 2. create ui, create new document with vars, attach doc
+    // also it would be possible to create a function, that scans unbound vars
+    // and connects them to available vars
+    /*
+    UiContext *rootctx = uic_root_context(ctx); 
+    UiVar *b = NULL;
+    if(rootctx->bound) {
+        // some widgets are already bound to some vars
+        b = ucx_map_cstr_get(rootctx->bound, name);
+        if(b) {
+            // a widget is bound to a var with this name
+            // if ctx is the root context we can remove the var from bound
+            // because set_doc or detach can't fuck things up
+            if(ctx == rootctx) {
+                ucx_map_cstr_remove(ctx->bound, name);
+                // TODO: free stuff
+            }
+        }
+    }
+    */
+    
+    // create new var and add it to doc's vars
+    UiVar *var = ui_malloc(ctx, sizeof(UiVar));
+    var->type = type;
+    var->value = value;
+    var->from = NULL;
+    var->from_ctx = ctx;
+    size_t oldcount = ctx->vars->count;
+    ucx_map_cstr_put(ctx->vars, name, var);
+    if(ctx->vars->count != oldcount + 1) {
+        fprintf(stderr, "UiError: var '%s' already exists\n", name);
+    }
+    
+    // TODO: remove?
+    // a widget is already bound to a var with this name
+    // copy the binding (like uic_context_set_document)
+    /*
+    if(b) {
+        uic_copy_binding(b, var, TRUE);
+    }
+    */
+}
+
+void uic_remove_bound_var(UiContext *ctx, UiVar *var) {
+    // TODO: implement
+    printf("TODO: implement uic_remove_bound_var\n");
+}
+
+
+// public API
+
+void ui_attach_document(UiContext *ctx, void *document) {
+    uic_context_attach_document(ctx, document);
+}
+
+void ui_detach_document2(UiContext *ctx, void *document) {
+    uic_context_detach_document2(ctx, document);
+}
+
+void ui_context_closefunc(UiContext *ctx, ui_callback fnc, void *udata) {
+    ctx->close_callback = fnc;
+    ctx->close_data = udata;
+}
+
+
+
+void ui_set_group(UiContext *ctx, int group) {
+    if(ucx_list_find(ctx->groups, (void*)(intptr_t)group, NULL, NULL) == -1) {
+        ctx->groups = ucx_list_append_a(ctx->mempool->allocator, ctx->groups, (void*)(intptr_t)group);
+    }
+    
+    // enable/disable group widgets
+    uic_check_group_widgets(ctx);
+}
+
+void ui_unset_group(UiContext *ctx, int group) {
+    int i = ucx_list_find(ctx->groups, (void*)(intptr_t)group, NULL, NULL);
+    if(i != -1) {
+        UcxList *elm = ucx_list_get(ctx->groups, i);
+        ctx->groups = ucx_list_remove_a(ctx->mempool->allocator, ctx->groups, elm);
+    }
+    
+    // enable/disable group widgets
+    uic_check_group_widgets(ctx);
+}
+
+int* ui_active_groups(UiContext *ctx, int *ngroups) {
+    if(!ctx->groups) {
+        return NULL;
+    }
+    
+    int nelm = ucx_list_size(ctx->groups);
+    int *groups = calloc(sizeof(int), nelm);
+    
+    int i = 0;
+    UCX_FOREACH(elm, ctx->groups) {
+        groups[i++] = (intptr_t)elm->data;
+    }
+    
+    *ngroups = nelm;
+    return groups;
+}
+
+void uic_check_group_widgets(UiContext *ctx) {
+    int ngroups = 0;
+    int *groups = ui_active_groups(ctx, &ngroups);
+    
+    UCX_FOREACH(elm, ctx->group_widgets) {
+        UiGroupWidget *gw = elm->data;
+        char *check = calloc(1, gw->numgroups);
+        
+        for(int i=0;i<ngroups;i++) {
+            for(int k=0;k<gw->numgroups;k++) {
+                if(groups[i] == gw->groups[k]) {
+                    check[k] = 1;
+                }
+            }
+        }
+        
+        int enable = 1;
+        for(int i=0;i<gw->numgroups;i++) {
+            if(check[i] == 0) {
+                enable = 0;
+                break;
+            }
+        }
+        ui_set_enabled(gw->widget, enable);
+    }
+    
+    if(groups) {
+        free(groups);
+    }
+}
+
+void uic_add_group_widget(UiContext *ctx, void *widget, UcxList *groups) {
+    UcxMempool *mp = ctx->mempool;
+    UiGroupWidget *gw = ucx_mempool_malloc(mp, sizeof(UiGroupWidget));
+    
+    gw->widget = widget;
+    gw->numgroups = ucx_list_size(groups);
+    gw->groups = ucx_mempool_calloc(mp, gw->numgroups, sizeof(int));
+    int i = 0;
+    UCX_FOREACH(elm, groups) {
+        gw->groups[i++] = (intptr_t)elm->data;
+    }
+    
+    ctx->group_widgets = ucx_list_append_a(
+            mp->allocator,
+            ctx->group_widgets,
+            gw);
+}
+
+void* ui_malloc(UiContext *ctx, size_t size) {
+    return ctx ? ucx_mempool_malloc(ctx->mempool, size) : NULL;
+}
+
+void* ui_calloc(UiContext *ctx, size_t nelem, size_t elsize) {
+    return ctx ? ucx_mempool_calloc(ctx->mempool, nelem, elsize) : NULL;
+}
+
+void ui_free(UiContext *ctx, void *ptr) {
+    if(ctx) {
+        ucx_mempool_free(ctx->mempool, ptr);
+    }
+}
+
+void* ui_realloc(UiContext *ctx, void *ptr, size_t size) {
+    return ctx ? ucx_mempool_realloc(ctx->mempool, ptr, size) : NULL;
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/context.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,130 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UIC_CONTEXT_H
+#define	UIC_CONTEXT_H
+
+#include "../ui/toolkit.h"
+#include <ucx/map.h>
+#include <ucx/mempool.h>
+#include <ucx/list.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiVar         UiVar;
+typedef struct UiListPtr     UiListPtr;
+typedef struct UiListVar     UiListVar;
+typedef struct UiGroupWidget UiGroupWidget;
+
+typedef enum UiVarType UiVarType;
+
+enum UiVarType {
+    UI_VAR_SPECIAL = 0,
+    UI_VAR_INTEGER,
+    UI_VAR_DOUBLE,
+    UI_VAR_STRING,
+    UI_VAR_TEXT,
+    UI_VAR_LIST,
+    UI_VAR_RANGE
+};
+
+struct UiContext {
+    UiContext     *parent;
+    UiObject      *obj;
+    UcxMempool    *mempool;
+    
+    void          *document;
+    UcxList       *documents;
+    
+    UcxMap        *vars; // manually created context vars
+    UcxMap        *vars_unbound; // unbound vars created by widgets
+    
+    UcxList       *groups; // int list
+    UcxList       *group_widgets; // UiGroupWidget* list
+    
+    void (*attach_document)(UiContext *ctx, void *document);
+    void (*detach_document2)(UiContext *ctx, void *document); 
+    
+    char          *title;
+    
+#ifdef UI_GTK
+    GtkAccelGroup *accel_group;
+#endif
+    
+    ui_callback   close_callback;
+    void          *close_data;
+};
+
+// UiVar replacement, rename it to UiVar when finished
+struct UiVar {
+    void      *value;
+    UiVarType type;
+    UiVar    *from;
+    UiContext *from_ctx;
+};
+
+struct UiGroupWidget {
+    UIWIDGET widget;
+    int      *groups;
+    int      numgroups;
+};
+
+
+UiContext* uic_context(UiObject *toplevel, UcxMempool *mp);
+UiContext* uic_root_context(UiContext *ctx);
+void uic_context_set_document(UiContext *ctx, void *document); // deprecated
+void uic_context_detach_document(UiContext *ctx); // deprecated
+
+void uic_context_attach_document(UiContext *ctx, void *document);
+void uic_context_detach_document2(UiContext *ctx, void *document);
+void uic_context_detach_all(UiContext *ctx);
+
+UiVar* uic_get_var(UiContext *ctx, char *name);
+UiVar* uic_create_var(UiContext *ctx, char *name, UiVarType type);
+void* uic_create_value(UiContext *ctx, UiVarType type);
+
+void uic_copy_binding(UiVar *from, UiVar *to, UiBool copytodoc);
+void uic_save_var2(UiVar *var);
+void uic_unbind_var(UiVar *var);
+
+void uic_reg_var(UiContext *ctx, char *name, UiVarType type, void *value);
+
+void uic_remove_bound_var(UiContext *ctx, UiVar *var);
+
+void uic_check_group_widgets(UiContext *ctx);
+void uic_add_group_widget(UiContext *ctx, void *widget, UcxList *groups);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UIC_CONTEXT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/document.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,102 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "document.h"
+
+static UcxMap *documents;
+
+void uic_docmgr_init() {
+    documents = ucx_map_new(32);
+}
+
+void ui_set_document(UiObject *obj, void *document) {
+    uic_context_detach_all(obj->ctx);
+    obj->ctx->attach_document(obj->ctx, document);
+}
+
+void ui_detach_document(UiObject *obj) {
+    uic_context_detach_all(obj->ctx);
+}
+
+void* ui_get_document(UiObject *obj) {
+    return obj->ctx->document;
+}
+
+void ui_set_subdocument(void *document, void *sub) {
+    UiContext *ctx = ui_document_context(document);
+    if(!ctx) {
+        fprintf(stderr, "UI Error: pointer is not a document\n");
+    }
+    // TODO
+}
+
+void ui_detach_subdocument(void *document, void *sub) {
+    UiContext *ctx = ui_document_context(document);
+    if(!ctx) {
+        fprintf(stderr, "UI Error: pointer is not a document\n");
+    }
+    // TODO
+}
+
+void* ui_get_subdocument(void *document) {
+    UiContext *ctx = ui_document_context(document);
+    if(!ctx) {
+        fprintf(stderr, "UI Error: pointer is not a document\n");
+    }
+    // TODO
+    return NULL;
+}
+
+void* ui_document_new(size_t size) {
+    UcxMempool *mp = ucx_mempool_new(256);
+    UiContext *ctx = ucx_mempool_calloc(mp, 1, sizeof(UiContext));
+    ctx->attach_document = uic_context_attach_document;
+    ctx->detach_document2 = uic_context_detach_document2;
+    ctx->mempool = mp;
+    ctx->vars = ucx_map_new_a(mp->allocator, 16);
+    
+    void *document = ucx_mempool_calloc(mp, 1, size);
+    ucx_map_put(documents, ucx_key(&document, sizeof(void*)), ctx);
+    return document;
+}
+
+void ui_document_destroy(void *doc) {
+    // TODO
+}
+
+UiContext* ui_document_context(void *doc) {
+    if(doc) {
+        return ucx_map_get(documents, ucx_key(&doc, sizeof(void*)));
+    } else {
+        return NULL;
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/document.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,48 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UIC_DOCUMENT_H
+#define	UIC_DOCUMENT_H
+
+#include "../ui/toolkit.h"
+#include "context.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+void uic_docmgr_init();
+void uic_document_addvar(void *doc, char *name, int type, size_t vs);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UIC_DOCUMENT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/object.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,81 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "object.h"
+#include "context.h"
+
+void ui_end(UiObject *obj) {
+    if(!obj->next) {
+        return;
+    }
+    
+    UiObject *prev = NULL;
+    while(obj->next) {
+        prev = obj;
+        obj = obj->next;
+    }
+    
+    if(prev) {
+        // TODO: free last obj
+        prev->next = NULL;
+    }
+}
+
+
+UiObject* uic_object_new(UiObject *toplevel, UIWIDGET widget) {
+    UiContext *ctx = toplevel->ctx;
+    
+    UiObject *newobj = ucx_mempool_calloc(ctx->mempool, 1, sizeof(UiObject));
+    newobj->ctx = ctx;
+    newobj->widget = widget;
+    
+    return newobj;
+}
+
+void uic_obj_add(UiObject *toplevel, UiObject *ctobj) {
+    UiObject *current = uic_current_obj(toplevel);
+    current->next = ctobj;
+}
+
+UiObject* uic_current_obj(UiObject *toplevel) {
+    if(!toplevel) {
+        return NULL;
+    }
+    UiObject *obj = toplevel;
+    while(obj->next) {
+        obj = obj->next;
+    }
+    return obj;
+}
+
+UiContainer* uic_get_current_container(UiObject *obj) {
+    return uic_current_obj(obj)->container;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/object.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,50 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UIC_OBJECT_H
+#define	UIC_OBJECT_H
+
+#include "../ui/toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+UiObject* uic_object_new(UiObject *toplevel, UIWIDGET widget);
+void uic_obj_add(UiObject *toplevel, UiObject *ctobj);
+UiObject* uic_current_obj(UiObject *toplevel);
+
+UiContainer* uic_get_current_container(UiObject *obj);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UIC_OBJECT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/objs.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,40 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2017 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+COMMON_SRC_DIR = ui/common/
+COMMON_OBJPRE = $(OBJ_DIR)$(COMMON_SRC_DIR)
+
+COMMON_OBJ = context.o
+COMMON_OBJ += document.o
+COMMON_OBJ += object.o
+COMMON_OBJ += types.o
+COMMON_OBJ += properties.o
+
+TOOLKITOBJS += $(COMMON_OBJ:%=$(COMMON_OBJPRE)%)
+TOOLKITSOURCE += $(COMMON_OBJ:%.o=common/%.c)
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/properties.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,297 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+#include "properties.h"
+#include <ucx/string.h>
+#include <ucx/buffer.h>
+#include <ucx/properties.h>
+
+static UiProperties *application_properties;
+static UiProperties *language;
+
+#ifndef UI_COCOA
+
+static char *locales_dir;
+static char *pixmaps_dir;
+
+#endif
+
+char* ui_getappdir() {
+    if(ui_appname() == NULL) {
+        return NULL;
+    }
+    
+    return ui_configfile(NULL);
+}
+
+char* ui_configfile(char *name) {
+    char *appname = ui_appname();
+    if(!appname) {
+        return NULL;
+    }
+    
+    UcxBuffer *buf = ucx_buffer_new(NULL, 128, UCX_BUFFER_AUTOEXTEND);
+    
+    // add base dir
+    char *homeenv = getenv("HOME");
+    if(homeenv == NULL) {
+        ucx_buffer_free(buf);
+        return NULL;
+    }
+    sstr_t home = sstr(homeenv);
+    
+    ucx_buffer_write(home.ptr, 1, home.length, buf);
+    if(home.ptr[home.length-1] != '/') {
+        ucx_buffer_putc(buf, '/');
+    }
+    
+#ifdef UI_COCOA
+    // on OS X the app dir is $HOME/Library/Application Support/$APPNAME/
+    ucx_buffer_puts(buf, "Library/Application Support/");
+#else
+    // app dir is $HOME/.$APPNAME/
+    ucx_buffer_putc(buf, '.');
+#endif
+    ucx_buffer_puts(buf, appname);
+    ucx_buffer_putc(buf, '/');
+    
+    // add file name
+    if(name) {
+        ucx_buffer_puts(buf, name);
+    }
+    
+    char *path = buf->space;
+    free(buf);
+    return path;  
+}
+
+static int ui_mkdir(char *path) {
+#ifdef _WIN32
+    return mkdir(path);
+#else
+    return mkdir(path, S_IRWXU);
+#endif
+} 
+
+void uic_load_app_properties() {
+    application_properties = ucx_map_new(128);
+    
+    if(!ui_appname()) {
+        // applications without name cannot load app properties
+        return;
+    }
+    
+    char *dir = ui_configfile(NULL);
+    if(!dir) {
+        return;
+    }
+    if(ui_mkdir(dir)) {
+        if(errno != EEXIST) {
+            fprintf(stderr, "Ui Error: Cannot create directory %s\n", dir);
+            free(dir);
+            return;
+        }
+    }
+    free(dir);
+    
+    char *path = ui_configfile("application.properties");
+    if(!path) {
+        return;
+    }
+    
+    FILE *file = fopen(path, "r");
+    if(!file) {
+        free(path);
+        return;
+    }
+    
+    if(ucx_properties_load(application_properties, file)) {
+        fprintf(stderr, "Ui Error: Cannot load application properties.\n");
+    }
+    
+    fclose(file);
+    free(path);
+}
+
+void uic_store_app_properties() {
+    char *path = ui_configfile("application.properties");
+    if(!path) {
+        return;
+    }
+    
+    FILE *file = fopen(path, "w");
+    if(!file) {
+        fprintf(stderr, "Ui Error: Cannot open properties file: %s\n", path);
+        free(path);
+        return;
+    }
+    
+    if(ucx_properties_store(application_properties, file)) {
+        fprintf(stderr, "Ui Error: Cannot store application properties.\n");
+    }
+    
+    fclose(file);
+    free(path);
+}
+
+
+char* ui_get_property(char *name) {
+    return ucx_map_cstr_get(application_properties, name);
+}
+
+void ui_set_property(char *name, char *value) {
+    ucx_map_cstr_put(application_properties, name, value);
+}
+
+void ui_set_default_property(char *name, char *value) {
+    char *v = ucx_map_cstr_get(application_properties, name);
+    if(!v) {
+        ucx_map_cstr_put(application_properties, name, value);
+    }
+}
+
+
+
+static char* uic_concat_path(const char *base, const char *p, const char *ext) {
+    size_t baselen = strlen(base);
+    
+    UcxBuffer *buf = ucx_buffer_new(NULL, 32, UCX_BUFFER_AUTOEXTEND);
+    if(baselen > 0) {
+        ucx_buffer_write(base, 1, baselen, buf);
+        if(base[baselen - 1] != '/') {
+            ucx_buffer_putc(buf, '/');
+        }
+    }
+    ucx_buffer_write(p, 1, strlen(p), buf);
+    if(ext) {
+        ucx_buffer_write(ext, 1, strlen(ext), buf);
+    }
+    
+    char *str = buf->space;
+    free(buf);
+    return str;
+}
+
+#ifndef UI_COCOA
+
+void ui_locales_dir(char *path) {
+    locales_dir = path;
+}
+
+void ui_pixmaps_dir(char *path) {
+    pixmaps_dir = path;
+}
+
+char* uic_get_image_path(const char *imgfilename) {
+    if(pixmaps_dir) {
+        return uic_concat_path(pixmaps_dir, imgfilename, NULL);
+    } else {
+        return NULL;
+    }
+}
+
+void ui_load_lang(char *locale) {
+    if(!locale) {
+        locale = "en_EN";
+    }
+    
+    char *path = uic_concat_path(locales_dir, locale, ".properties");
+    
+    uic_load_language_file(path);
+    free(path);
+}
+
+void ui_load_lang_def(char *locale, char *default_locale) {
+    char tmp[6];
+    if(!locale) {
+        char *lang = getenv("LANG");
+        if(lang && strlen(lang) >= 5) {
+            memcpy(tmp, lang, 5);
+            tmp[5] = '\0';
+            locale = tmp;
+        } else {
+            locale = default_locale;
+        }
+    }
+    
+    char *path = uic_concat_path(locales_dir, locale, ".properties");
+    
+    if(uic_load_language_file(path)) {
+        if(default_locale) {
+            ui_load_lang_def(default_locale, NULL);
+        } else {
+            // cannot find any language file
+            fprintf(stderr, "Ui Error: Cannot load language.\n");
+            free(path);
+            exit(-1);
+        }
+    }
+    free(path);
+}
+
+#endif
+
+int uic_load_language_file(const char *path) {
+    UcxMap *lang = ucx_map_new(256);
+    
+    FILE *file = fopen(path, "r");
+    if(!file) {
+        return 1;
+    }
+    
+    if(ucx_properties_load(lang, file)) {
+        fprintf(stderr, "Ui Error: Cannot parse language file: %s.\n", path);
+    }
+    
+    fclose(file);
+    
+    ucx_map_rehash(lang);
+    
+    language = lang;
+    
+    return 0;
+}
+
+char* uistr(char *name) {
+    char *value = uistr_n(name);
+    return value ? value : "missing string";
+}
+
+char* uistr_n(char *name) {
+    if(!language) {
+        return NULL;
+    }
+    return ucx_map_cstr_get(language, name);
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/properties.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,57 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UIC_PROPERTIES_H
+#define	UIC_PROPERTIES_H
+
+#include "../ui/properties.h"
+#include <ucx/map.h>
+#include <ucx/list.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#ifdef _WIN32
+#define UI_HOME "USERPROFILE"
+#else
+#define UI_HOME "HOME"
+#endif
+
+void uic_load_app_properties();
+void uic_store_app_properties();
+
+int uic_load_language_file(const char *path);
+char* uic_get_image_path(const char *imgfilename);
+    
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UIC_PROPERTIES_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/types.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,390 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+
+#include <ucx/list.h>
+#include "../ui/tree.h"
+#include "types.h"
+#include "context.h"
+
+UiObserver* ui_observer_new(ui_callback f, void *data) {
+    UiObserver *observer = malloc(sizeof(UiObserver));
+    observer->callback = f;
+    observer->data = data;
+    observer->next = NULL;
+    return observer;
+}
+
+UiObserver* ui_obsvlist_add(UiObserver *list, UiObserver *observer) {
+    if(!list) {
+        return observer;
+    } else {
+        UiObserver *l = list;
+        while(l->next) {
+            l = l->next;
+        }
+        l->next = observer;
+        return list;
+    }
+}
+
+UiObserver* ui_add_observer(UiObserver *list, ui_callback f, void *data) {
+    UiObserver *observer = ui_observer_new(f, data);
+    return ui_obsvlist_add(list, observer);
+}
+
+void ui_notify(UiObserver *observer, void *data) {
+    ui_notify_except(observer, NULL, data);
+}
+
+void ui_notify_except(UiObserver *observer, UiObserver *exc, void *data) {
+    while(observer) {
+        if(observer != exc) {
+            UiEvent evt;
+            evt.obj = NULL;
+            evt.window = NULL;
+            evt.document = NULL;
+            evt.eventdata = data;
+            evt.intval = 0;
+            observer->callback(&evt, observer->data);
+        }
+        observer = observer->next;
+    }
+}
+
+void ui_notify_evt(UiObserver *observer, UiEvent *event) {
+    while(observer) {
+        observer->callback(event, observer->data);
+        observer = observer->next;
+    }
+}
+
+/* --------------------------- UiList --------------------------- */
+
+UiList* ui_list_new(UiContext *ctx, char *name) {
+    UiList *list = malloc(sizeof(UiList));
+    list->first = ui_list_first;
+    list->next = ui_list_next;
+    list->get = ui_list_get;
+    list->count = ui_list_count;
+    list->observers = NULL;
+    
+    list->data = NULL;
+    list->iter = NULL;
+    
+    list->update = NULL;
+    list->obj = NULL;
+    
+    if(name) {
+        uic_reg_var(ctx, name, UI_VAR_LIST, list);
+    }
+    
+    return list;
+}
+
+void ui_list_free(UiList *list) {
+    ucx_list_free(list->data);
+    free(list);
+}
+
+void* ui_list_first(UiList *list) {
+    UcxList *elm = list->data;
+    list->iter = elm;
+    return elm ? elm->data : NULL;
+}
+
+void* ui_list_next(UiList *list) {
+    UcxList *elm = list->iter;
+    if(elm) {
+        elm = elm->next;
+        if(elm) {
+            list->iter = elm;
+            return elm->data;
+        }
+    }
+    return NULL;
+}
+
+void* ui_list_get(UiList *list, int i) {
+    UcxList *elm = ucx_list_get(list->data, i);
+    if(elm) {
+        list->iter = elm;
+        return elm->data;
+    } else {
+        return NULL;
+    }
+}
+
+int ui_list_count(UiList *list) {
+    UcxList *elm = list->data;
+    return (int)ucx_list_size(elm);
+}
+
+void ui_list_append(UiList *list, void *data) {
+    list->data = ucx_list_append(list->data, data);
+}
+
+void ui_list_prepend(UiList *list, void *data) {
+    list->data = ucx_list_prepend(list->data, data);
+}
+
+void ui_list_clear(UiList *list) {
+    ucx_list_free(list->data);
+    list->data = NULL;
+}
+
+void ui_list_addobsv(UiList *list, ui_callback f, void *data) {
+    list->observers = ui_add_observer(list->observers, f, data);
+}
+
+void ui_list_notify(UiList *list) {
+    ui_notify(list->observers, list);
+}
+
+
+typedef struct {
+    int  type;
+    char *name;
+} UiColumn;
+
+UiModel* ui_model(UiContext *ctx, ...) {
+    UiModel *info = ui_calloc(ctx, 1, sizeof(UiModel));
+    
+    va_list ap;
+    va_start(ap, ctx);
+    
+    UcxList *cols = NULL;
+    int type;
+    while((type = va_arg(ap, int)) != -1) {
+        char *name = va_arg(ap, char*);
+        
+        UiColumn *column = malloc(sizeof(UiColumn));
+        column->type = type;
+        column->name = name;
+        
+        cols = ucx_list_append(cols, column);
+    }
+    
+    va_end(ap);
+    
+    size_t len = ucx_list_size(cols);
+    info->columns = len;
+    info->types = ui_calloc(ctx, len, sizeof(UiModelType));
+    info->titles = ui_calloc(ctx, len, sizeof(char*));
+    
+    int i = 0;
+    UCX_FOREACH(elm, cols) {
+        UiColumn *c = elm->data;
+        info->types[i] = c->type;
+        info->titles[i] = c->name;
+        free(c);
+        i++;
+    }
+    ucx_list_free(cols);
+    
+    return info;
+}
+
+void ui_model_free(UiContext *ctx, UiModel *mi) {
+    ucx_mempool_free(ctx->mempool, mi->types);
+    ucx_mempool_free(ctx->mempool, mi->titles);
+    ucx_mempool_free(ctx->mempool, mi);
+}
+
+// types
+
+// public functions
+UiInteger* ui_int_new(UiContext *ctx, char *name) {
+    UiInteger *i = ui_malloc(ctx, sizeof(UiInteger));
+    memset(i, 0, sizeof(UiInteger));
+    if(name) {
+        uic_reg_var(ctx, name, UI_VAR_INTEGER, i);
+    }
+    return i;
+}
+
+UiDouble* ui_double_new(UiContext *ctx, char *name) {
+    UiDouble *d = ui_malloc(ctx, sizeof(UiDouble));
+    memset(d, 0, sizeof(UiDouble));
+    if(name) {
+        uic_reg_var(ctx, name, UI_VAR_DOUBLE, d);
+    }
+    return d;
+}
+
+UiString* ui_string_new(UiContext *ctx, char *name) {
+    UiString *s = ui_malloc(ctx, sizeof(UiString));
+    memset(s, 0, sizeof(UiString));
+    if(name) {
+        uic_reg_var(ctx, name, UI_VAR_STRING, s);
+    }
+    return s;
+}
+
+UiText* ui_text_new(UiContext *ctx, char *name) {
+    UiText *t = ui_malloc(ctx, sizeof(UiText));
+    memset(t, 0, sizeof(UiText));
+    if(name) {
+        uic_reg_var(ctx, name, UI_VAR_TEXT, t);
+    }
+    return t;
+}
+
+UiRange* ui_range_new(UiContext *ctx, char *name) {
+    UiRange *r = ui_malloc(ctx, sizeof(UiRange));
+    memset(r, 0, sizeof(UiRange));
+    if(name) {
+        uic_reg_var(ctx, name, UI_VAR_RANGE, r);
+    }
+    return r;
+}
+
+
+// private functions
+void uic_int_copy(UiInteger *from, UiInteger *to) {
+    to->get = from->get;
+    to->set = from->set;
+    to->obj = from->obj;
+}
+
+void uic_double_copy(UiDouble *from, UiDouble *to) {
+    to->get = from->get;
+    to->set = from->set;
+    to->obj = from->obj;
+}
+
+void uic_string_copy(UiString *from, UiString *to) {
+    to->get = from->get;
+    to->set = from->set;
+    to->obj = from->obj;
+}
+
+void uic_text_copy(UiText *from, UiText *to) {
+    to->get = from->get;
+    to->set = from->set;
+    to->getsubstr = from->getsubstr;
+    to->insert = from->insert;
+    to->setposition = from->setposition;
+    to->position = from->position;
+    to->selection = from->selection;
+    to->length = from->length;
+    to->remove = from->remove;
+    
+    to->obj = from->obj;
+    // do not copy the undo manager
+}
+
+void uic_range_copy(UiRange *from, UiRange *to) {
+    to->get = from->get;
+    to->set = from->set;
+    to->setrange = from->setrange;
+    to->setextent = from->setextent;
+    to->obj = from->obj;
+}
+
+void uic_list_copy(UiList *from, UiList *to) {
+    to->update = from->update;
+    to->obj = from->obj;
+}
+
+
+void uic_int_save(UiInteger *i) {
+    if(!i->obj) return;
+    i->value = i->get(i);
+}
+
+void uic_double_save(UiDouble *d) {
+    if(!d->obj) return;
+    d->value = d->get(d);
+}
+
+void uic_string_save(UiString *s) {
+    if(!s->obj) return;
+    s->get(s);
+}
+
+void uic_text_save(UiText *t) {
+    if(!t->obj) return;
+    t->get(t);
+    t->position(t);
+}
+
+void uic_range_save(UiRange *r) {
+    if(!r->obj) return;
+    r->get(r);
+}
+
+
+void uic_int_unbind(UiInteger *i) {
+    i->get = NULL;
+    i->set = NULL;
+    i->obj = NULL;
+}
+
+void uic_double_unbind(UiDouble *d) {
+    d->get = NULL;
+    d->set = NULL;
+    d->obj = NULL;
+}
+
+void uic_string_unbind(UiString *s) {
+    s->get = NULL;
+    s->set = NULL;
+    s->obj = NULL;
+}
+
+void uic_text_unbind(UiText *t) {
+    t->set = NULL;
+    t->get = NULL;
+    t->getsubstr = NULL;
+    t->insert = NULL;
+    t->setposition = NULL;
+    t->position = NULL;
+    t->selection = NULL;
+    t->length = NULL;
+    t->remove = NULL;
+    t->obj = NULL;
+    t->undomgr = NULL;
+}
+
+void uic_range_unbind(UiRange *r) {
+    r->get = NULL;
+    r->set = NULL;
+    r->setextent = NULL;
+    r->setrange = NULL;
+    r->obj = NULL;
+}
+
+void uic_list_unbind(UiList *l) {
+    l->update = NULL;
+    l->obj = NULL;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/types.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,64 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UIC_TYPES_H
+#define	UIC_TYPES_H
+
+#include "../ui/toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+
+void uic_int_copy(UiInteger *from, UiInteger *to);
+void uic_double_copy(UiDouble *from, UiDouble *to);
+void uic_string_copy(UiString *from, UiString *to);
+void uic_text_copy(UiText *from, UiText *to);
+void uic_range_copy(UiRange *from, UiRange *to);
+void uic_list_copy(UiList *from, UiList *to);
+
+void uic_int_save(UiInteger *i);
+void uic_double_save(UiDouble *d);
+void uic_string_save(UiString *s);
+void uic_text_save(UiText *t);
+void uic_range_save(UiRange *r);
+
+void uic_int_unbind(UiInteger *i);
+void uic_double_unbind(UiDouble *d);
+void uic_string_unbind(UiString *s);
+void uic_text_unbind(UiText *t);
+void uic_range_unbind(UiRange *r);
+void uic_list_unbind(UiList *l);
+    
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UIC_TYPES_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/Makefile	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,34 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2012 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+$(GTK_OBJPRE)%.o: gtk/%.c
+	$(CC) -o $@ -c -I../ucx $(CFLAGS) $(TK_CFLAGS) $<
+	
+$(UI_LIB): $(OBJ)
+	$(AR) $(ARFLAGS) $(UI_LIB) $(OBJ)	
+	
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/button.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,264 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "button.h"
+#include "container.h"
+#include <ucx/mempool.h>
+#include "../common/context.h"
+#include "../common/object.h"
+
+UIWIDGET ui_button(UiObject *obj, char *label, ui_callback f, void *data) {
+    GtkWidget *button = gtk_button_new_with_label(label);
+    
+    if(f) {
+        UiEventData *event = malloc(sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = data;
+        event->callback = f;
+        event->value = 0;
+
+        g_signal_connect(
+                button,
+                "clicked",
+                G_CALLBACK(ui_button_clicked),
+                event);
+        g_signal_connect(
+                button,
+                "destroy",
+                G_CALLBACK(ui_destroy_userdata),
+                event);
+    }
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, button, FALSE);
+    
+    return button;
+}
+
+
+void ui_button_clicked(GtkWidget *widget, UiEventData *event) {
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.eventdata = NULL;
+    e.intval = event->value;
+    event->callback(&e, event->userdata);
+}
+
+void ui_button_toggled(GtkToggleToolButton *widget, UiEventData *event) {
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.eventdata = NULL;
+    e.intval = gtk_toggle_tool_button_get_active(widget);
+    event->callback(&e, event->userdata);
+}
+
+int64_t ui_toggle_button_get(UiInteger *integer) {
+    GtkToggleButton *button = integer->obj;
+    integer->value = (int)gtk_toggle_button_get_active(button);
+    return integer->value;
+}
+
+void ui_toggle_button_set(UiInteger *integer, int64_t value) {
+    GtkToggleButton *button = integer->obj;
+    integer->value = value;
+    gtk_toggle_button_set_active(button, value != 0 ? TRUE : FALSE);
+}
+
+void ui_toggled_obs(GtkToggleToolButton *widget, UiVarEventData *event) {
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.eventdata = event->var->value;
+    e.intval = gtk_toggle_tool_button_get_active(widget);
+    
+    UiInteger *i = event->var->value;
+    ui_notify_evt(i->observers, &e);
+}
+
+UIWIDGET ui_checkbox_var(UiObject *obj, char *label, UiVar *var) {
+    GtkWidget *button = gtk_check_button_new_with_label(label);
+    
+    // bind value
+    if(var) {
+        UiInteger *value = var->value;
+        value->obj = GTK_TOGGLE_BUTTON(button);
+        value->get = ui_toggle_button_get;
+        value->set = ui_toggle_button_set;
+        gtk_toggle_button_set_active(value->obj, value->value);
+        
+        UiVarEventData *event = malloc(sizeof(UiVarEventData));
+        event->obj = obj;
+        event->var = var;
+        event->observers = NULL;
+
+        g_signal_connect(
+                button,
+                "clicked",
+                G_CALLBACK(ui_toggled_obs),
+                event);
+        g_signal_connect(
+                button,
+                "destroy",
+                G_CALLBACK(ui_destroy_vardata),
+                event);
+    }
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, button, FALSE);
+    
+    return button;
+}
+
+UIWIDGET ui_checkbox(UiObject *obj, char *label, UiInteger *value) {
+    UiVar *var = NULL;
+    if(value) {
+        var = malloc(sizeof(UiVar));
+        var->value = value;
+        var->type = UI_VAR_SPECIAL;
+    }
+    return ui_checkbox_var(obj, label, var);
+}
+
+UIWIDGET ui_checkbox_nv(UiObject *obj, char *label, char *varname) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_INTEGER);
+    return ui_checkbox_var(obj, label, var);
+}
+
+
+UIWIDGET ui_radiobutton_var(UiObject *obj, char *label, UiVar *var) {
+    GSList *rg = NULL;
+    UiInteger *rgroup;
+    
+    if(var) {
+        rgroup = var->value;
+        rg = rgroup->obj;
+    }
+    
+    GtkWidget *rbutton = gtk_radio_button_new_with_label(rg, label);
+    rg = gtk_radio_button_get_group(GTK_RADIO_BUTTON(rbutton));
+    
+    if(rgroup) {
+        rgroup->obj = rg;
+        rgroup->get = ui_radiobutton_get;
+        rgroup->set = ui_radiobutton_set;
+        
+        ui_radiobutton_set(rgroup, rgroup->value);
+        
+        UiVarEventData *event = malloc(sizeof(UiVarEventData));
+        event->obj = obj;
+        event->var = var;
+        event->observers = NULL;
+        
+        g_signal_connect(
+                rbutton,
+                "clicked",
+                G_CALLBACK(ui_radio_obs),
+                event);
+        g_signal_connect(
+                rbutton,
+                "destroy",
+                G_CALLBACK(ui_destroy_vardata),
+                event);
+    }
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, rbutton, FALSE);
+    
+    return rbutton;
+}
+
+UIWIDGET ui_radiobutton(UiObject *obj, char *label, UiInteger *rgroup) {
+    UiVar *var = NULL;
+    if(rgroup) {
+        var = malloc(sizeof(UiVar));
+        var->value = rgroup;
+        var->type = UI_VAR_SPECIAL;
+    }
+    return ui_radiobutton_var(obj, label, var);
+}
+
+UIWIDGET ui_radiobutton_nv(UiObject *obj, char *label, char *varname) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_INTEGER);
+    return ui_radiobutton_var(obj, label, var);
+}
+
+void ui_radio_obs(GtkToggleToolButton *widget, UiVarEventData *event) {
+    UiInteger *i = event->var->value;
+    
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.eventdata = NULL;
+    e.intval = i->get(i);
+    
+    ui_notify_evt(i->observers, &e);
+}
+
+int64_t ui_radiobutton_get(UiInteger *value) {
+    int selection = 0;
+    GSList *ls = value->obj;
+    int i = 0;
+    guint len = g_slist_length(ls);
+    while(ls) {
+        if(gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(ls->data))) {
+            selection = len - i - 1;
+            break;
+        }
+        ls = ls->next;
+        i++;
+    }
+    
+    value->value = selection;
+    return selection;
+}
+
+void ui_radiobutton_set(UiInteger *value, int64_t i) {
+    GSList *ls = value->obj;
+    int s = g_slist_length(ls) - 1 - i;
+    int j = 0;
+    while(ls) {
+        if(j == s) {
+            gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(ls->data), TRUE);
+            break;
+        }
+        ls = ls->next;
+        j++;
+    }
+    
+    value->value = i;
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/button.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,61 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef BUTTON_H
+#define	BUTTON_H
+
+#include "../ui/toolkit.h"
+#include "../ui/button.h"
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+// event wrapper
+void ui_button_clicked(GtkWidget *widget, UiEventData *event);
+void ui_button_toggled(GtkToggleToolButton *widget, UiEventData *event);
+
+
+void ui_toggled_obs(GtkToggleToolButton *widget, UiVarEventData *event);
+
+UIWIDGET ui_checkbox_var(UiObject *obj, char *label, UiVar *var);
+
+UIWIDGET ui_radiobutton_var(UiObject *obj, char *label, UiVar *var);
+
+void ui_radio_obs(GtkToggleToolButton *widget, UiVarEventData *event);
+
+int64_t ui_radiobutton_get(UiInteger *value);
+void ui_radiobutton_set(UiInteger *value, int64_t i);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* BUTTON_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/container.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,627 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#include "container.h"
+#include "toolkit.h"
+
+#include "../common/context.h"
+#include "../common/object.h"
+
+
+void ui_container_begin_close(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->close = 1;
+}
+
+int ui_container_finish(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    if(ct->close) {
+        ui_end(obj);
+        return 0;
+    }
+    return 1;
+}
+
+GtkWidget* ui_gtk_vbox_new(int spacing) {
+#ifdef UI_GTK3
+    return gtk_box_new(GTK_ORIENTATION_VERTICAL, spacing);
+#else
+    return gtk_vbox_new(FALSE, spacing);
+#endif
+}
+
+GtkWidget* ui_gtk_hbox_new(int spacing) {
+#ifdef UI_GTK3
+    return gtk_box_new(GTK_ORIENTATION_HORIZONTAL, spacing);
+#else
+    return gtk_hbox_new(FALSE, spacing);
+#endif
+}
+
+/* -------------------- Frame Container (deprecated) -------------------- */
+UiContainer* ui_frame_container(UiObject *obj, GtkWidget *frame) {
+    UiContainer *ct = ucx_mempool_calloc(
+            obj->ctx->mempool,
+            1,
+            sizeof(UiContainer));
+    ct->widget = frame;
+    ct->add = ui_frame_container_add;
+    return ct;
+}
+
+void ui_frame_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
+    gtk_container_add(GTK_CONTAINER(ct->widget), widget);
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+
+
+/* -------------------- Box Container -------------------- */
+UiContainer* ui_box_container(UiObject *obj, GtkWidget *box) {
+    UiBoxContainer *ct = ucx_mempool_calloc(
+            obj->ctx->mempool,
+            1,
+            sizeof(UiBoxContainer));
+    ct->container.widget = box;
+    ct->container.add = ui_box_container_add;
+    return (UiContainer*)ct;
+}
+
+void ui_box_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
+    UiBoxContainer *bc = (UiBoxContainer*)ct;
+    if(ct->layout.fill != UI_LAYOUT_UNDEFINED) {
+        fill = ui_lb2bool(ct->layout.fill);
+    }
+    
+    if(bc->has_fill && fill) {
+        fprintf(stderr, "UiError: container has 2 filled widgets");
+        fill = FALSE;
+    }
+    if(fill) {
+        bc->has_fill = TRUE;
+    }
+    
+    UiBool expand = fill;
+    gtk_box_pack_start(GTK_BOX(ct->widget), widget, expand, fill, 0);
+    
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+
+UiContainer* ui_grid_container(UiObject *obj, GtkWidget *grid) {
+    UiGridContainer *ct = ucx_mempool_calloc(
+            obj->ctx->mempool,
+            1,
+            sizeof(UiGridContainer));
+    ct->container.widget = grid;
+    ct->container.add = ui_grid_container_add;
+#ifdef UI_GTK2
+    ct->width = 0;
+    ct->height = 1;
+#endif
+    return (UiContainer*)ct;
+}
+
+#ifdef UI_GTK3
+void ui_grid_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
+    UiGridContainer *grid = (UiGridContainer*)ct;
+    
+    if(ct->layout.newline) {
+        grid->x = 0;
+        grid->y++;
+        ct->layout.newline = FALSE;
+    }
+    
+    int hexpand = FALSE;
+    int vexpand = FALSE;
+    if(ct->layout.hexpand != UI_LAYOUT_UNDEFINED) {
+        hexpand = ct->layout.hexpand;
+    }
+    if(ct->layout.vexpand != UI_LAYOUT_UNDEFINED) {
+        vexpand = ct->layout.vexpand;
+    }
+    
+    if(hexpand) {
+        gtk_widget_set_hexpand(widget, TRUE);
+    }
+    if(vexpand) {
+        gtk_widget_set_vexpand(widget, TRUE);
+    }
+    
+    int gwidth = ct->layout.gridwidth > 0 ? ct->layout.gridwidth : 1;
+    
+    gtk_grid_attach(GTK_GRID(ct->widget), widget, grid->x, grid->y, gwidth, 1);
+    grid->x += gwidth;
+    
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+#endif
+#ifdef UI_GTK2
+void ui_grid_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
+    UiGridContainer *grid = (UiGridContainer*)ct;
+    
+    if(ct->layout.newline) {
+        grid->x = 0;
+        grid->y++;
+        ct->layout.newline = FALSE;
+    }
+    
+    int hexpand = FALSE;
+    int vexpand = FALSE;
+    if(ct->layout.hexpand != UI_LAYOUT_UNDEFINED) {
+        hexpand = ct->layout.hexpand;
+    }
+    if(ct->layout.vexpand != UI_LAYOUT_UNDEFINED) {
+        vexpand = ct->layout.vexpand;
+    }
+    GtkAttachOptions xoptions = hexpand ? GTK_FILL | GTK_EXPAND : GTK_FILL;
+    GtkAttachOptions yoptions = vexpand ? GTK_FILL | GTK_EXPAND : GTK_FILL;
+    
+    gtk_table_attach(GTK_TABLE(ct->widget), widget, grid->x, grid->x+1, grid->y, grid->y+1, xoptions, yoptions, 0, 0);
+    grid->x++;
+    int nw = grid->x > grid->width ? grid->x : grid->width;
+    if(grid->x > grid->width || grid->y > grid->height) {
+        grid->width = nw;
+        grid->height = grid->y + 1;
+        gtk_table_resize(GTK_TABLE(ct->widget), grid->width, grid->height);
+    }
+    
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+#endif
+
+UiContainer* ui_scrolledwindow_container(UiObject *obj, GtkWidget *scrolledwindow) {
+    UiContainer *ct = ucx_mempool_calloc(
+            obj->ctx->mempool,
+            1,
+            sizeof(UiContainer));
+    ct->widget = scrolledwindow;
+    ct->add = ui_scrolledwindow_container_add;
+    return ct;
+}
+
+void ui_scrolledwindow_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
+    // TODO: check if the widget implements GtkScrollable
+#ifdef UI_GTK3
+    gtk_container_add(GTK_CONTAINER(ct->widget), widget);
+#else
+    gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(ct->widget), widget);
+#endif
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+
+UiContainer* ui_tabview_container(UiObject *obj, GtkWidget *tabview) {
+    UiTabViewContainer *ct = ucx_mempool_calloc(
+            obj->ctx->mempool,
+            1,
+            sizeof(UiTabViewContainer));
+    ct->container.widget = tabview;
+    ct->container.add = ui_tabview_container_add;
+    return (UiContainer*)ct;
+}
+
+void ui_tabview_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
+    gtk_notebook_append_page(
+            GTK_NOTEBOOK(ct->widget),
+            widget,
+            gtk_label_new(ct->layout.label));
+    
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+
+
+UIWIDGET ui_vbox(UiObject *obj) {
+    return ui_vbox_sp(obj, 0, 0);
+}
+
+UIWIDGET ui_hbox(UiObject *obj) {
+    return ui_hbox_sp(obj, 0, 0);
+}
+
+static GtkWidget* box_set_margin(GtkWidget *box, int margin) {
+    GtkWidget *ret = box;
+#ifdef UI_GTK3
+#if GTK_MAJOR_VERSION == 3 && GTK_MINOR_VERSION >= 12
+    gtk_widget_set_margin_start(box, margin);
+    gtk_widget_set_margin_end(box, margin);
+#else
+    gtk_widget_set_margin_left(box, margin);
+    gtk_widget_set_margin_right(box, margin);
+#endif
+    gtk_widget_set_margin_top(box, margin);
+    gtk_widget_set_margin_bottom(box, margin);
+#elif defined(UI_GTK2)
+    GtkWidget *a = gtk_alignment_new(0.5, 0.5, 1, 1);
+    gtk_alignment_set_padding(GTK_ALIGNMENT(a), margin, margin, margin, margin);
+    gtk_container_add(GTK_CONTAINER(a), box);
+    ret = a;
+#endif
+    return ret;
+}
+
+UIWIDGET ui_vbox_sp(UiObject *obj, int margin, int spacing) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    GtkWidget *vbox = ui_gtk_vbox_new(spacing);   
+    GtkWidget *widget = margin > 0 ? box_set_margin(vbox, margin) : vbox;
+    ct->add(ct, widget, TRUE);
+    
+    UiObject *newobj = uic_object_new(obj, vbox);
+    newobj->container = ui_box_container(obj, vbox);
+    uic_obj_add(obj, newobj);
+    
+    return widget;
+}
+
+UIWIDGET ui_hbox_sp(UiObject *obj, int margin, int spacing) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    GtkWidget *hbox = ui_gtk_hbox_new(spacing);
+    GtkWidget *widget = margin > 0 ? box_set_margin(hbox, margin) : hbox;
+    ct->add(ct, widget, TRUE);
+    
+    UiObject *newobj = uic_object_new(obj, hbox);
+    newobj->container = ui_box_container(obj, hbox);
+    uic_obj_add(obj, newobj);
+    
+    return widget;
+}
+
+UIWIDGET ui_grid(UiObject *obj) {
+    return ui_grid_sp(obj, 0, 0, 0);
+}
+
+UIWIDGET ui_grid_sp(UiObject *obj, int margin, int columnspacing, int rowspacing) {
+    UiContainer *ct = uic_get_current_container(obj);
+    GtkWidget *widget;
+    
+#ifdef UI_GTK3
+    GtkWidget *grid = gtk_grid_new();
+    gtk_grid_set_column_spacing(GTK_GRID(grid), columnspacing);
+    gtk_grid_set_row_spacing(GTK_GRID(grid), rowspacing);
+#if GTK_MAJOR_VERSION == 3 && GTK_MINOR_VERSION >= 12
+    gtk_widget_set_margin_start(grid, margin);
+    gtk_widget_set_margin_end(grid, margin);
+#else
+    gtk_widget_set_margin_left(grid, margin);
+    gtk_widget_set_margin_right(grid, margin);
+#endif
+    gtk_widget_set_margin_top(grid, margin);
+    gtk_widget_set_margin_bottom(grid, margin);
+    
+    widget = grid;
+#elif defined(UI_GTK2)
+    GtkWidget *grid = gtk_table_new(1, 1, FALSE);
+    
+    gtk_table_set_col_spacings(GTK_TABLE(grid), columnspacing);
+    gtk_table_set_row_spacings(GTK_TABLE(grid), rowspacing);
+    
+    if(margin > 0) {
+        GtkWidget *a = gtk_alignment_new(0.5, 0.5, 1, 1);
+        gtk_alignment_set_padding(GTK_ALIGNMENT(a), margin, margin, margin, margin);
+        gtk_container_add(GTK_CONTAINER(a), grid);
+        widget = a;
+    } else {
+        widget = grid;
+    }
+#endif
+    ct->add(ct, widget, TRUE);
+    
+    UiObject *newobj = uic_object_new(obj, grid);
+    newobj->container = ui_grid_container(obj, grid);
+    uic_obj_add(obj, newobj);
+    
+    return widget;
+}
+
+UIWIDGET ui_scrolledwindow(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    GtkWidget *sw = gtk_scrolled_window_new(NULL, NULL);
+    ct->add(ct, sw, TRUE);
+    
+    UiObject *newobj = uic_object_new(obj, sw);
+    newobj->container = ui_scrolledwindow_container(obj, sw);
+    uic_obj_add(obj, newobj);
+    
+    return sw;
+}
+
+UIWIDGET ui_tabview(UiObject *obj) {
+    GtkWidget *tabview = gtk_notebook_new();
+    gtk_notebook_set_show_border(GTK_NOTEBOOK(tabview), FALSE);
+    gtk_notebook_set_show_tabs(GTK_NOTEBOOK(tabview), FALSE);
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, tabview, TRUE);
+    
+    UiObject *tabviewobj = uic_object_new(obj, tabview);
+    tabviewobj->container = ui_tabview_container(obj, tabview);
+    uic_obj_add(obj, tabviewobj);
+    
+    return tabview;
+}
+
+void ui_tab(UiObject *obj, char *title) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.label = title;
+    ui_vbox(obj);
+}
+
+void ui_select_tab(UIWIDGET tabview, int tab) {
+    gtk_notebook_set_current_page(GTK_NOTEBOOK(tabview), tab);
+}
+
+/* -------------------- Splitpane -------------------- */
+
+static GtkWidget* create_paned(UiOrientation orientation) {
+#ifdef UI_GTK3
+    switch(orientation) {
+        case UI_HORIZONTAL: return gtk_paned_new(GTK_ORIENTATION_HORIZONTAL);
+        case UI_VERTICAL: return gtk_paned_new(GTK_ORIENTATION_VERTICAL);
+    }
+#else
+    switch(orientation) {
+        case UI_HORIZONTAL: return gtk_hpaned_new();
+        case UI_VERTICAL: return gtk_vpaned_new();
+    }
+#endif
+    return NULL;
+}
+
+UIWIDGET ui_splitpane(UiObject *obj, int max, UiOrientation orientation) {
+    GtkWidget *paned = create_paned(orientation);
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, paned, TRUE);
+    
+    if(max <= 0) max = INT_MAX;
+    
+    UiPanedContainer *pctn = ucx_mempool_calloc(
+            obj->ctx->mempool,
+            1,
+            sizeof(UiPanedContainer));
+    pctn->container.widget = paned;
+    pctn->container.add = ui_paned_container_add;
+    pctn->current_pane = paned;
+    pctn->orientation = orientation;
+    pctn->max = max;
+    pctn->cur = 0;
+    
+    UiObject *pobj = uic_object_new(obj, paned);
+    pobj->container = (UiContainer*)pctn;
+    
+    uic_obj_add(obj, pobj);
+    
+    return paned;
+}
+
+UIWIDGET ui_hsplitpane(UiObject *obj, int max) {
+    return ui_splitpane(obj, max, UI_HORIZONTAL);
+}
+
+UIWIDGET ui_vsplitpane(UiObject *obj, int max) {
+    return ui_splitpane(obj, max, UI_VERTICAL);
+}
+
+void ui_paned_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
+    UiPanedContainer *pctn = (UiPanedContainer*)ct;
+    
+    gboolean resize = (ct->layout.hexpand || ct->layout.vexpand) ? TRUE : FALSE;
+    int width = ct->layout.width;
+    ui_reset_layout(ct->layout);
+    
+    if(pctn->cur == 0) {
+        gtk_paned_pack1(GTK_PANED(pctn->current_pane), widget, resize, resize);
+    } else if(pctn->cur < pctn->max-1) {
+        GtkWidget *nextPane = create_paned(pctn->orientation);
+        gtk_paned_pack2(GTK_PANED(pctn->current_pane), nextPane, TRUE, TRUE);
+        gtk_paned_pack1(GTK_PANED(nextPane), widget, resize, resize);
+        pctn->current_pane = nextPane;
+    } else if(pctn->cur == pctn->max-1) {
+        gtk_paned_pack2(GTK_PANED(pctn->current_pane), widget, resize, resize);
+        width = 0; // disable potential call of gtk_paned_set_position
+    } else {
+        fprintf(stderr, "Splitpane max reached: %d\n", pctn->max);
+        return;
+    }
+    
+    if(width > 0) {
+        gtk_paned_set_position(GTK_PANED(pctn->current_pane), width);
+    }
+    
+    pctn->cur++;
+}
+
+
+/* -------------------- Sidebar (deprecated) -------------------- */
+UIWIDGET ui_sidebar(UiObject *obj) {
+#ifdef UI_GTK3
+    GtkWidget *paned = gtk_paned_new(GTK_ORIENTATION_HORIZONTAL);
+#else
+    GtkWidget *paned = gtk_hpaned_new();
+#endif
+    gtk_paned_set_position(GTK_PANED(paned), 200);
+    
+    GtkWidget *sidebar = ui_gtk_vbox_new(0);
+    gtk_paned_pack1(GTK_PANED(paned), sidebar, TRUE, FALSE);
+    
+    UiObject *left = uic_object_new(obj, sidebar);
+    UiContainer *ct1 = ui_box_container(obj, sidebar);
+    left->container = ct1;
+    
+    UiObject *right = uic_object_new(obj, sidebar);
+    UiContainer *ct2 = ucx_mempool_malloc(
+            obj->ctx->mempool,
+            sizeof(UiContainer));
+    ct2->widget = paned;
+    ct2->add = ui_split_container_add2;
+    right->container = ct2;
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, paned, TRUE);
+    
+    uic_obj_add(obj, right);
+    uic_obj_add(obj, left);
+    
+    return sidebar;
+}
+
+void ui_split_container_add1(UiContainer *ct, GtkWidget *widget, UiBool fill) {
+    // TODO: remove
+    gtk_paned_pack1(GTK_PANED(ct->widget), widget, TRUE, FALSE);
+    
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+
+void ui_split_container_add2(UiContainer *ct, GtkWidget *widget, UiBool fill) {
+    gtk_paned_pack2(GTK_PANED(ct->widget), widget, TRUE, FALSE);
+    
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+
+
+/* -------------------- Document Tabview -------------------- */
+static void page_change(GtkNotebook *notebook, GtkWidget *page, guint page_num, gpointer data) {
+    GQuark q = g_quark_from_static_string("ui.tab.object");
+    UiObject *tab = g_object_get_qdata(G_OBJECT(page), q);
+    if(!tab) {
+        return;
+    }
+    
+    //printf("page_change: %d\n", page_num);
+    UiContext *ctx = tab->ctx;
+    uic_context_detach_all(ctx->parent); // TODO: fix?
+    ctx->parent->attach_document(ctx->parent, ctx->document);
+}
+
+UiTabbedPane* ui_tabbed_document_view(UiObject *obj) {
+    GtkWidget *tabview = gtk_notebook_new();
+    gtk_notebook_set_show_border(GTK_NOTEBOOK(tabview), FALSE);
+    
+    g_signal_connect(
+                tabview,
+                "switch-page",
+                G_CALLBACK(page_change),
+                NULL);
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, tabview, TRUE);
+    
+    UiTabbedPane *tabbedpane = ui_malloc(obj->ctx, sizeof(UiTabbedPane));
+    tabbedpane->ctx = uic_current_obj(obj)->ctx;
+    tabbedpane->widget = tabview;
+    tabbedpane->document = NULL;
+    
+    return tabbedpane;
+}
+
+UiObject* ui_document_tab(UiTabbedPane *view) {
+    GtkWidget *frame = gtk_frame_new(NULL);
+    gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_NONE);
+    // TODO: label
+    gtk_notebook_append_page(GTK_NOTEBOOK(view->widget), frame, NULL);
+    
+    UiObject *tab = ui_malloc(view->ctx, sizeof(UiObject));
+    tab->widget = NULL; // initialization for uic_context()
+    tab->ctx = uic_context(tab, view->ctx->mempool);
+    tab->ctx->parent = view->ctx;
+    tab->ctx->attach_document = uic_context_attach_document;
+    tab->ctx->detach_document2 = uic_context_detach_document2;
+    tab->widget = frame;
+    tab->window = view->ctx->obj->window;
+    tab->container = ui_frame_container(tab, frame);
+    tab->next = NULL;
+    
+    GQuark q = g_quark_from_static_string("ui.tab.object");
+    g_object_set_qdata(G_OBJECT(frame), q, tab);
+    
+    return tab;
+}
+
+void ui_tab_set_document(UiContext *ctx, void *document) {
+    // TODO: remove?
+    if(ctx->parent->document) {
+        //ctx->parent->detach_document(ctx->parent, ctx->parent->document);
+    }
+    //uic_context_set_document(ctx, document);
+    //uic_context_set_document(ctx->parent, document);
+    //ctx->parent->document = document;
+}
+
+void ui_tab_detach_document(UiContext *ctx) {
+    // TODO: remove?
+    //uic_context_detach_document(ctx->parent);
+}
+
+
+/*
+ * -------------------- Layout Functions --------------------
+ * 
+ * functions for setting layout attributes for the current container
+ *
+ */
+
+void ui_layout_fill(UiObject *obj, UiBool fill) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.fill = ui_bool2lb(fill);
+}
+
+void ui_layout_hexpand(UiObject *obj, UiBool expand) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.hexpand = expand;
+}
+
+void ui_layout_vexpand(UiObject *obj, UiBool expand) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.vexpand = expand;
+}
+
+void ui_layout_width(UiObject *obj, int width) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.width = width;
+}
+
+void ui_layout_gridwidth(UiObject *obj, int width) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.gridwidth = width;
+}
+
+void ui_newline(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.newline = TRUE;
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/container.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,138 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CONTAINER_H
+#define	CONTAINER_H
+
+#include "../ui/toolkit.h"
+#include "../ui/container.h"
+#include <string.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#define ui_reset_layout(layout) memset(&(layout), 0, sizeof(UiLayout))
+#define ui_lb2bool(b) ((b) == UI_LAYOUT_TRUE ? TRUE : FALSE)
+#define ui_bool2lb(b) ((b) ? UI_LAYOUT_TRUE : UI_LAYOUT_FALSE)
+    
+typedef void (*ui_container_add_f)(UiContainer*, GtkWidget*, UiBool);
+
+typedef struct UiDocumentView UiDocumentView;
+
+typedef struct UiLayout UiLayout;
+typedef enum UiLayoutBool UiLayoutBool;
+
+enum UiLayoutBool {
+    UI_LAYOUT_UNDEFINED = 0,
+    UI_LAYOUT_TRUE,
+    UI_LAYOUT_FALSE,
+};
+
+struct UiLayout {
+    UiLayoutBool fill;
+    UiBool       newline;
+    char         *label;
+    UiBool       hexpand;
+    UiBool       vexpand;
+    int          width;
+    int          gridwidth;
+};
+
+struct UiContainer {
+    GtkWidget *widget;
+    GtkMenu *menu;
+    GtkWidget *current;
+    
+    void (*add)(UiContainer*, GtkWidget*, UiBool);
+    UiLayout layout;
+    
+    int close;
+};
+
+typedef struct UiBoxContainer {
+    UiContainer container;
+    UiBool has_fill;
+} UiBoxContainer;
+
+typedef struct UiGridContainer {
+    UiContainer container;
+    int x;
+    int y;
+#ifdef UI_GTK2
+    int width;
+    int height;
+#endif
+} UiGridContainer;
+
+typedef struct UiPanedContainer {
+    UiContainer container;
+    GtkWidget *current_pane;
+    int orientation;
+    int max;
+    int cur;
+} UiPanedContainer;
+
+typedef struct UiTabViewContainer {
+    UiContainer container;
+} UiTabViewContainer;
+
+GtkWidget* ui_gtk_vbox_new(int spacing);
+GtkWidget* ui_gtk_hbox_new(int spacing);
+
+UiContainer* ui_frame_container(UiObject *obj, GtkWidget *frame);
+void ui_frame_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill);
+
+UiContainer* ui_box_container(UiObject *obj, GtkWidget *box);
+void ui_box_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill);
+
+UiContainer* ui_grid_container(UiObject *obj, GtkWidget *grid);
+void ui_grid_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill);
+
+UiContainer* ui_scrolledwindow_container(UiObject *obj, GtkWidget *scrolledwindow);
+void ui_scrolledwindow_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill);
+
+UiContainer* ui_tabview_container(UiObject *obj, GtkWidget *tabview);
+void ui_tabview_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill);
+
+void ui_paned_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill);
+
+void ui_split_container_add1(UiContainer *ct, GtkWidget *widget, UiBool fill);
+void ui_split_container_add2(UiContainer *ct, GtkWidget *widget, UiBool fill);
+
+
+UiObject* ui_add_document_tab(UiDocumentView *view);
+void ui_tab_set_document(UiContext *ctx, void *document);
+void ui_tab_detach_document(UiContext *ctx);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* CONTAINER_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/display.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,128 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "display.h"
+#include "container.h"
+#include <ucx/mempool.h>
+#include "../common/context.h"
+#include "../common/object.h"
+
+static void set_alignment(GtkWidget *widget, float xalign, float yalign) {
+#if GTK_MAJOR_VERSION >= 3 && GTK_MINOR_VERSION >= 16
+    gtk_label_set_xalign(GTK_LABEL(widget), xalign);
+    gtk_label_set_yalign(GTK_LABEL(widget), yalign);
+#else
+    gtk_misc_set_alignment(GTK_MISC(widget), xalign, yalign);
+#endif
+}
+
+UIWIDGET ui_label(UiObject *obj, char *label) { 
+    GtkWidget *widget = gtk_label_new(label);
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, widget, FALSE);
+    
+    return widget;
+}
+
+UIWIDGET ui_llabel(UiObject *obj, char *label) {
+    UIWIDGET widget = ui_label(obj, label);
+    set_alignment(widget, 0, .5);
+    return widget;
+}
+
+UIWIDGET ui_rlabel(UiObject *obj, char *label) {
+    UIWIDGET widget = ui_label(obj, label);
+    //gtk_label_set_justify(GTK_LABEL(widget), GTK_JUSTIFY_RIGHT);
+    
+    set_alignment(widget, 1, .5);
+    return widget;
+}
+
+UIWIDGET ui_space(UiObject *obj) {
+    GtkWidget *widget = gtk_label_new("");
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, widget, TRUE);
+    
+    return widget;
+}
+
+UIWIDGET ui_separator(UiObject *obj) {
+#if UI_GTK3
+    GtkWidget *widget = gtk_separator_new(GTK_ORIENTATION_HORIZONTAL);
+#else
+    GtkWidget *widget = gtk_hseparator_new();
+#endif
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, widget, FALSE);
+    
+    return widget;
+}
+
+/* ------------------------- progress bar ------------------------- */
+
+UIWIDGET ui_progressbar(UiObject *obj, UiDouble *value) {
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = value;
+    var->type = UI_VAR_SPECIAL;
+    return ui_progressbar_var(obj, var);
+}
+
+UIWIDGET ui_progressbar_nv(UiObject *obj, char *varname) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_DOUBLE);
+    return ui_progressbar_var(obj, var);
+}
+
+UIWIDGET ui_progressbar_var(UiObject *obj, UiVar *var) {
+    GtkWidget *progressbar = gtk_progress_bar_new();
+    if(var && var->value) {
+        UiDouble *value = var->value;
+        value->get = ui_progressbar_get;
+        value->set = ui_progressbar_set;
+        value->obj = progressbar;
+        gtk_progress_bar_set_fraction(GTK_PROGRESS_BAR(progressbar), 0.5);
+    }
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, progressbar, FALSE);
+    
+    return progressbar;
+}
+
+double ui_progressbar_get(UiDouble *d) {
+    d->value = gtk_progress_bar_get_fraction(GTK_PROGRESS_BAR(d->obj));
+    return d->value;
+}
+
+void ui_progressbar_set(UiDouble *d, double value) {
+    gtk_progress_bar_set_fraction(GTK_PROGRESS_BAR(d->obj), value);
+    d->value = value;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/display.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,48 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef LABEL_H
+#define	LABEL_H
+
+#include "../ui/toolkit.h"
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+UIWIDGET ui_progressbar_var(UiObject *obj, UiVar *var);
+double ui_progressbar_get(UiDouble *d);
+void ui_progressbar_set(UiDouble *d, double value);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* LABEL_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/dnd.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,101 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "dnd.h"
+#include <ucx/buffer.h>
+
+#ifdef UI_GTK2LEGACY
+static gboolean selection_data_set_uris(GtkSelectionData *selection_data, char **uris) {
+    UcxBuffer *buf = ucx_buffer_new(NULL, 1024, UCX_BUFFER_AUTOEXTEND);
+    char *uri;
+    int i = 0;
+    while((uri = uris[i]) != NULL) {
+        ucx_buffer_puts(buf, uri);
+        ucx_buffer_puts(buf, "\r\n");
+    }
+    GdkAtom type = gdk_atom_intern("text/uri-list", FALSE);
+    gtk_selection_data_set(selection_data, type, 8, (guchar*)buf->space, buf->pos);
+    ucx_buffer_free(buf);
+    return TRUE;
+}
+static char** selection_data_get_uris(GtkSelectionData *selection_data) {
+    // TODO: implement
+    return NULL;
+}
+#define gtk_selection_data_set_uris selection_data_set_uris
+#define gtk_selection_data_get_uris selection_data_get_uris
+#endif
+
+void ui_selection_settext(UiSelection *sel, char *str, int len) {
+    // TODO: handle error?
+    gtk_selection_data_set_text(sel->data, str, len);
+}
+
+void ui_selection_seturis(UiSelection *sel, char **uris, int nelm) {
+    char **uriarray = calloc(nelm+1, sizeof(char*));
+    for(int i=0;i<nelm;i++) {
+        uriarray[i] = uris[i];
+    }
+    uriarray[nelm] = NULL;
+    gtk_selection_data_set_uris(sel->data, uriarray);
+}
+
+char* ui_selection_gettext(UiSelection *sel) {
+    guchar *text = gtk_selection_data_get_text(sel->data);
+    if(text) {
+        char *textcp = strdup((char*)text);
+        g_free(text);
+        return textcp;
+    }
+    return NULL;
+}
+
+char** ui_selection_geturis(UiSelection *sel, size_t *nelm) {
+    gchar **uris = gtk_selection_data_get_uris(sel->data);
+    if(uris) {
+        size_t al = 32;
+        char **array = malloc(al * sizeof(char*));
+        size_t i = 0;
+        while(uris[i] != NULL) {
+            if(i >= al) {
+                al *= 2;
+                array = realloc(array, al * sizeof(char*));
+            }
+            array[i] = strdup((char*)uris[i]);
+            i++;
+        }
+        *nelm = i;
+        g_strfreev(uris);
+        return array;
+    }
+    return NULL;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/dnd.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,47 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DND_H
+#define DND_H
+
+#include "../ui/dnd.h"
+#include "toolkit.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* DND_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/draw_cairo.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,132 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "container.h"
+
+#include "draw_cairo.h"
+
+#ifdef UI_GTK3
+gboolean ui_drawingarea_expose(GtkWidget *w, cairo_t *cr, void *data) {
+    UiCairoGraphics g;
+    g.g.width = gtk_widget_get_allocated_width(w);
+    g.g.height = gtk_widget_get_allocated_height(w);
+    g.widget = w;
+    g.cr = cr;
+    
+    UiDrawEvent *event = data;
+    UiEvent ev;
+    ev.obj = event->obj;
+    ev.window = event->obj->window;
+    ev.document = event->obj->ctx->document;
+    
+    event->callback(&ev, &g.g, event->userdata);
+    
+    return FALSE;
+}
+#else
+gboolean ui_canvas_expose(GtkWidget *w, GdkEventExpose *e, void *data) {
+    UiCairoGraphics g;
+    g.g.width = w->allocation.width;
+    g.g.height = w->allocation.height;
+    g.widget = w;
+    g.cr = gdk_cairo_create(w->window);
+    
+    UiDrawEvent *event = data;
+    UiEvent ev;
+    ev.obj = event->obj;
+    ev.window = event->obj->window;
+    ev.document = event->obj->ctx->document;
+    
+    event->callback(&ev, &g.g, event->userdata);
+    
+    return FALSE;
+}
+#endif
+
+// function from graphics.h
+
+void ui_connect_draw_handler(GtkWidget *widget, UiDrawEvent *event) {
+#ifdef UI_GTK3
+    g_signal_connect(G_OBJECT(widget),
+            "draw",
+            G_CALLBACK(ui_drawingarea_expose),
+            event);
+#else
+    g_signal_connect(G_OBJECT(widget),
+            "expose_event",
+            G_CALLBACK(ui_canvas_expose),
+            event);
+#endif
+}
+
+
+PangoContext *ui_get_pango_context(UiGraphics *g) {
+    UiCairoGraphics *gr = (UiCairoGraphics*)g;
+    //return gtk_widget_get_pango_context(gr->widget);
+    return pango_cairo_create_context(gr->cr);
+}
+
+
+// drawing functions
+void ui_graphics_color(UiGraphics *g, int red, int green, int blue) {
+    UiCairoGraphics *gr = (UiCairoGraphics*)g;
+    double dred = (double)red / (double)255;
+    double dgreen = (double)green / (double)255;
+    double dblue = (double)blue / (double)255;
+    cairo_set_source_rgb(gr->cr, dred, dgreen, dblue);
+}
+
+
+void ui_draw_line(UiGraphics *g, int x1, int y1, int x2, int y2) {
+    UiCairoGraphics *gr = (UiCairoGraphics*)g;
+    cairo_set_line_width(gr->cr, 1);
+    cairo_move_to(gr->cr, (double)x1 + 0.5, (double)y1 + 0.5);
+    cairo_line_to(gr->cr, (double)x2 + 0.5, (double)y2 + 0.5);
+    cairo_stroke(gr->cr);
+}
+
+void ui_draw_rect(UiGraphics *g, int x, int y, int w, int h, int fill) {
+    UiCairoGraphics *gr = (UiCairoGraphics*)g;
+    cairo_set_line_width(gr->cr, 1);
+    cairo_rectangle(gr->cr, x + 0.5, y + 0.5 , w, h);
+    if(fill) {
+        cairo_fill(gr->cr);
+    } else {
+        cairo_stroke(gr->cr);
+    }
+}
+
+void ui_draw_text(UiGraphics *g, int x, int y, UiTextLayout *text) {
+    UiCairoGraphics *gr = (UiCairoGraphics*)g; 
+    cairo_move_to(gr->cr, x, y);
+    pango_cairo_show_layout(gr->cr, text->layout);
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/draw_cairo.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,51 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DRAW_CAIRO_H
+#define	DRAW_CAIRO_H
+
+#include "graphics.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiCairoGraphics {
+    UiGraphics g;
+    GtkWidget  *widget;
+    cairo_t    *cr;
+} UiCairoGraphics;
+
+// ui_canvas_expose
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* DRAW_CAIRO_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/draw_gdk.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,93 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "container.h"
+
+#include "draw_gdk.h"
+
+
+gboolean ui_drawingarea_expose(GtkWidget *w, GdkEventExpose *e, void *data) {
+    UiGdkGraphics g;
+    g.g.width = w->allocation.width;
+    g.g.height = w->allocation.height;
+    g.widget = w;
+    g.gc = gdk_gc_new(w->window);
+    
+    UiDrawEvent *event = data;
+    UiEvent ev;
+    ev.obj = event->obj;
+    ev.window = event->obj->window;
+    ev.document = event->obj->ctx->document;
+    
+    event->callback(&ev, &g.g, event->userdata);
+    
+    return FALSE;
+}
+
+// function from graphics.h
+
+void ui_connect_draw_handler(GtkWidget *widget, UiDrawEvent *event) {
+    g_signal_connect(G_OBJECT(widget),
+            "expose_event",
+            G_CALLBACK(ui_drawingarea_expose),
+            event);
+}
+
+PangoContext *ui_get_pango_context(UiGraphics *g) {
+    UiGdkGraphics *gr = (UiGdkGraphics*)g;
+    return gtk_widget_get_pango_context(gr->widget);
+}
+
+// drawing functions
+void ui_graphics_color(UiGraphics *g, int red, int green, int blue) {
+    UiGdkGraphics *gr = (UiGdkGraphics*)g;
+    GdkColor color;
+    color.red = red * 257;
+    color.green = green * 257;
+    color.blue = blue * 257;
+    gdk_gc_set_rgb_fg_color(gr->gc, &color);
+    //gdk_gc_set_rgb_bg_color(g->gc, &color);
+}
+
+void ui_draw_line(UiGraphics *g, int x1, int y1, int x2, int y2) {
+    UiGdkGraphics *gr = (UiGdkGraphics*)g; 
+    gdk_draw_line(gr->widget->window, gr->gc, x1, y1, x2, y2);
+}
+
+void ui_draw_rect(UiGraphics *g, int x, int y, int w, int h, int fill) {
+    UiGdkGraphics *gr = (UiGdkGraphics*)g; 
+    gdk_draw_rectangle(gr->widget->window, gr->gc, fill, x, y, w, h);
+}
+
+void ui_draw_text(UiGraphics *g, int x, int y, UiTextLayout *text) {
+    UiGdkGraphics *gr = (UiGdkGraphics*)g; 
+    gdk_draw_layout(gr->widget->window, gr->gc, x, y, text->layout);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/draw_gdk.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,51 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DRAW_GDK_H
+#define	DRAW_GDK_H
+
+#include "graphics.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiGdkGraphics {
+    UiGraphics g;
+    GtkWidget  *widget;
+    GdkGC      *gc;
+} UiGdkGraphics;
+
+gboolean ui_canvas_expose(GtkWidget *w, GdkEventExpose *e, void *data);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* DRAW_GDK_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/entry.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,214 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../common/context.h"
+#include "../common/object.h"
+#include "container.h"
+#include "entry.h"
+
+#include <ucx/mempool.h>
+
+UIWIDGET ui_spinner(UiObject *obj, int step, UiInteger *i) {
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = i;
+    var->type = UI_VAR_SPECIAL;
+    return ui_spinner_var(obj, step, 0, var, UI_VAR_INTEGER);
+}
+
+UIWIDGET ui_spinnerf(UiObject *obj, double step, int digits, UiDouble *d) {
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = d;
+    var->type = UI_VAR_SPECIAL;
+    return ui_spinner_var(obj, step, digits, var, UI_VAR_DOUBLE);
+}
+
+UIWIDGET ui_spinnerr(UiObject *obj, UiRange *r) {
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = r;
+    var->type = UI_VAR_SPECIAL;
+    return ui_spinner_var(obj, r->extent, 1, var, UI_VAR_RANGE);
+}
+
+UIWIDGET ui_spinner_nv(UiObject *obj, int step, char *varname) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_INTEGER);
+    return ui_spinner_var(obj, step, 0, var, UI_VAR_INTEGER);
+}
+
+UIWIDGET ui_spinnerf_nv(UiObject *obj, double step, int digits, char *varname) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_DOUBLE);
+    return ui_spinner_var(obj, step, digits, var, UI_VAR_DOUBLE);
+}
+
+UIWIDGET ui_spinnerr_nv(UiObject *obj, char *varname) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_RANGE);
+    UiRange *r = var->value;
+    return ui_spinner_var(obj, r->extent, 1, var, UI_VAR_RANGE);
+}
+
+UIWIDGET ui_spinner_var(UiObject *obj, double step, int digits, UiVar *var, UiVarType type) {
+    double min = 0;
+    double max = 1000;
+    if(type == UI_VAR_RANGE) {
+        UiRange *r = var->value;
+        min = r->min;
+        max = r->max;
+    }
+    if(step == 0) {
+        step = 1;
+    }
+#ifdef UI_GTK2LEGACY
+    if(min == max) {
+        max = min + 1;
+    }
+#endif
+    GtkWidget *spin = gtk_spin_button_new_with_range(min, max, step);
+    gtk_spin_button_set_digits(GTK_SPIN_BUTTON(spin), digits);
+    if(var) {
+        double value = 0;
+        UiObserver **obs = NULL;
+        switch(type) {
+            default: break;
+            case UI_VAR_INTEGER: {
+                UiInteger *i = var->value;
+                i->get = ui_spinbutton_getint;
+                i->set = ui_spinbutton_setint;
+                i->obj = spin;
+                value = (double)i->value;
+                obs = &i->observers;
+                break;
+            }
+            case UI_VAR_DOUBLE: {
+                UiDouble *d = var->value;
+                d->get = ui_spinbutton_getdouble;
+                d->set = ui_spinbutton_setdouble;
+                d->obj = spin;
+                value = d->value;
+                obs = &d->observers;
+                break;
+            }
+            case UI_VAR_RANGE: {
+                UiRange *r = var->value;
+                r->get = ui_spinbutton_getrangeval;
+                r->set = ui_spinbutton_setrangeval;
+                r->setrange = ui_spinbutton_setrange;
+                r->setextent = ui_spinbutton_setextent;
+                r->obj = spin;
+                value = r->value;
+                obs = &r->observers;
+                break;
+            }
+        }
+        gtk_spin_button_set_value(GTK_SPIN_BUTTON(spin), value);
+        
+        UiVarEventData *event = malloc(sizeof(UiVarEventData));
+        event->obj = obj;
+        event->var = var;
+        event->observers = obs;
+        
+        g_signal_connect(
+                spin,
+                "value-changed",
+                G_CALLBACK(ui_spinner_changed),
+                event);
+        g_signal_connect(
+                spin,
+                "destroy",
+                G_CALLBACK(ui_destroy_vardata),
+                event);
+    }
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, spin, FALSE);
+    
+    return spin;
+}
+
+void ui_spinner_setrange(UIWIDGET spinner, double min, double max) {
+    gtk_spin_button_set_range(GTK_SPIN_BUTTON(spinner), min, max);
+}
+
+void ui_spinner_setdigits(UIWIDGET spinner, int digits) {
+    gtk_spin_button_set_digits(GTK_SPIN_BUTTON(spinner), digits);
+}
+
+
+void ui_spinner_changed(GtkSpinButton *spinner, UiVarEventData *event) {
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.eventdata = event->var->value;
+    e.intval = 0;
+    
+    UiObserver *observer = *event->observers;
+    ui_notify_evt(observer, &e);
+}
+
+
+int64_t ui_spinbutton_getint(UiInteger *i) {
+    i->value = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(i->obj));
+    return i->value;
+}
+
+void ui_spinbutton_setint(UiInteger *i, int64_t val) {
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(i->obj), (double)val);
+    i->value = val;
+}
+
+double ui_spinbutton_getdouble(UiDouble *d) {
+    d->value = gtk_spin_button_get_value(GTK_SPIN_BUTTON(d->obj));
+    return d->value;
+}
+
+void ui_spinbutton_setdouble(UiDouble *d, double val) {
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(d->obj), val);
+    d->value = val;
+}
+
+double ui_spinbutton_getrangeval(UiRange *r) {
+    r->value = gtk_spin_button_get_value(GTK_SPIN_BUTTON(r->obj));
+    return r->value;
+}
+
+void ui_spinbutton_setrangeval(UiRange *r, double val) {
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(r->obj), val);
+    r->value = val;
+}
+void ui_spinbutton_setrange(UiRange *r, double min, double max) {
+    gtk_spin_button_set_range(GTK_SPIN_BUTTON(r->obj), min, max);
+    r->min = min;
+    r->max = max;
+}
+
+void ui_spinbutton_setextent(UiRange *r, double extent) {
+    gtk_spin_button_set_increments(GTK_SPIN_BUTTON(r->obj), extent, extent*10);
+    r->extent = extent;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/entry.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,45 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/* 
+ * File:   entry.h
+ * Author: olaf
+ *
+ * Created on 11. November 2017, 13:38
+ */
+
+#ifndef ENTRY_H
+#define ENTRY_H
+
+#include "toolkit.h"
+#include "../ui/entry.h"
+#include "../common/context.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+UIWIDGET ui_spinner_var(UiObject *obj, double step, int digits, UiVar *var, UiVarType type);
+void ui_spinner_changed(GtkSpinButton *spinner, UiVarEventData *event);
+
+int64_t ui_spinbutton_getint(UiInteger *i);
+void ui_spinbutton_setint(UiInteger *i, int64_t val);
+
+double ui_spinbutton_getdouble(UiDouble *d);
+void ui_spinbutton_setdouble(UiDouble *d, double val);
+
+double ui_spinbutton_getrangeval(UiRange *r);
+void ui_spinbutton_setrangeval(UiRange *r, double val);
+void ui_spinbutton_setrange(UiRange *r, double min, double max);
+void ui_spinbutton_setextent(UiRange *r, double extent);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ENTRY_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/graphics.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,157 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "graphics.h"
+#include "container.h"
+#include "../common/object.h"
+
+UIWIDGET ui_drawingarea(UiObject *obj, ui_drawfunc f, void *userdata) {
+    GtkWidget *widget = gtk_drawing_area_new();
+    
+    if(f) {
+        UiDrawEvent *event = malloc(sizeof(UiDrawEvent));
+        event->obj = obj;
+        event->callback = f;
+        event->userdata = userdata;
+        ui_connect_draw_handler(widget, event);
+    }
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, widget, TRUE);
+    
+    return widget;
+}
+
+
+static gboolean widget_button_pressed(
+        GtkWidget *widget,
+        GdkEvent *event,
+        gpointer userdata)
+{
+    UiEventData *eventdata = userdata;
+    
+    UiMouseEvent me;
+    me.x = (int)event->button.x;
+    me.y = (int)event->button.y;
+    
+    int exec = 0;
+    if(event->button.type == GDK_BUTTON_PRESS) {
+        exec = 1;
+        me.type = UI_PRESS;
+    } else if(event->button.type == GDK_2BUTTON_PRESS) {
+        exec = 1;
+        me.type = UI_PRESS2;
+    }
+    
+    if(exec) {
+        UiEvent e;
+        e.obj = eventdata->obj;
+        e.window = eventdata->obj->window;
+        e.document = eventdata->obj->ctx->document;
+        e.eventdata = &me;
+        e.intval = 0;
+        eventdata->callback(&e, eventdata->userdata);
+    }
+    return TRUE;
+}
+
+void ui_drawingarea_getsize(UIWIDGET drawingarea, int *width, int *height) {
+#ifdef UI_GTK3
+        *width = gtk_widget_get_allocated_width(drawingarea);
+        *height = gtk_widget_get_allocated_height(drawingarea);
+#else
+        *width = drawingarea->allocation.width;
+        *height = drawingarea->allocation.height;
+#endif
+}
+
+void ui_drawingarea_redraw(UIWIDGET drawingarea) {
+    gtk_widget_queue_draw(drawingarea);
+}
+
+void ui_drawingarea_mousehandler(UiObject *obj, UIWIDGET widget, ui_callback f, void *u) {
+    gtk_widget_set_events(widget, GDK_BUTTON_PRESS_MASK);
+    if(f) {
+        UiEventData *event = malloc(sizeof(UiEventData));
+        event->obj = obj;
+        event->callback = f;
+        event->userdata = u;
+        
+        g_signal_connect(G_OBJECT(widget),
+                "button-press-event",
+                G_CALLBACK(widget_button_pressed),
+                event);
+    } else {
+         // TODO: warning
+    }
+}
+
+
+// text layout
+UiTextLayout* ui_text(UiGraphics *g) {
+    UiTextLayout *layout = malloc(sizeof(UiTextLayout));
+    PangoContext *pc = ui_get_pango_context(g);
+    layout->layout = pango_layout_new(pc);
+    return layout;
+}
+
+void ui_text_setstring(UiTextLayout *layout, char *str) {
+    pango_layout_set_text(layout->layout, str, -1);
+}
+
+void ui_text_setstringl(UiTextLayout *layout, char *str, int len) {
+    pango_layout_set_text(layout->layout, str, len);
+}
+
+void ui_text_setfont(UiTextLayout *layout, char *font, int size) {
+    PangoFontDescription *fontDesc;
+    fontDesc = pango_font_description_from_string(font);
+    pango_font_description_set_size(fontDesc, size * PANGO_SCALE);
+    pango_layout_set_font_description(layout->layout, fontDesc);
+    pango_font_description_free(fontDesc);
+}
+
+void ui_text_getsize(UiTextLayout *layout, int *width, int *height) {
+    pango_layout_get_size(layout->layout, width, height);
+    *width = *width / PANGO_SCALE;
+    *height = *height / PANGO_SCALE;
+}
+
+void ui_text_setwidth(UiTextLayout *layout, int width) {
+    pango_layout_set_width(layout->layout, width * PANGO_SCALE);
+    pango_layout_set_ellipsize(layout->layout, PANGO_ELLIPSIZE_END);
+    //pango_layout_set_wrap(layout->layout, PANGO_WRAP_WORD_CHAR);
+}
+
+void ui_text_free(UiTextLayout *text) {
+    g_object_unref(text->layout);
+    free(text);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/graphics.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,58 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DRAWINGAREA_H
+#define	DRAWINGAREA_H
+
+#include "../ui/graphics.h"
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiDrawEvent {
+    ui_drawfunc callback;
+    UiObject    *obj;
+    void        *userdata;
+} UiDrawEvent;
+
+struct UiTextLayout {
+    PangoLayout *layout;
+};
+
+// implemented in draw_*.h
+void ui_connect_draw_handler(GtkWidget *widget, UiDrawEvent *event);
+PangoContext *ui_get_pango_context(UiGraphics *g);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* DRAWINGAREA_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/image.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,136 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ucx/map.h>
+
+#include "toolkit.h"
+#include "image.h"
+#include "../common/properties.h"
+
+static UcxMap *image_map;
+
+static GtkIconTheme *icon_theme;
+
+void ui_image_init(void) {
+    image_map = ucx_map_new(8);
+    
+    icon_theme = gtk_icon_theme_get_default();
+}
+
+// **** deprecated functions ****
+
+GdkPixbuf* ui_get_image(char *name) {
+    UiImage *img = ucx_map_cstr_get(image_map, name);
+    if(img) {
+        return img->pixbuf;
+    } else {
+        //ui_add_image(name, name);
+        //return ucx_map_cstr_get(image_map, name);
+        // TODO
+        return NULL;
+    }
+}
+
+// **** new functions ****
+
+static UiIcon* get_icon(const char *name, int size, int scale) {
+#ifdef UI_SUPPORTS_SCALE
+    GtkIconInfo *info = gtk_icon_theme_lookup_icon_for_scale(icon_theme, name, size, scale, 0);
+#else
+    GtkIconInfo *info = gtk_icon_theme_lookup_icon(icon_theme, name, size, 0);
+#endif
+    if(info) {
+        UiIcon *icon = malloc(sizeof(UiIcon));
+        icon->info = info;
+        return icon;
+    }
+    return NULL;
+}
+
+UiIcon* ui_icon(const char *name, int size) {
+    return get_icon(name, size, ui_get_scalefactor());
+}
+
+UiIcon* ui_icon_unscaled(const char *name, int size) {
+    return get_icon(name, size, 1);
+}
+
+void ui_free_icon(UiIcon *icon) {
+    g_object_unref(icon->info);
+    free(icon);
+}
+
+UiImage* ui_icon_image(UiIcon *icon) {
+    GError *error = NULL;
+    GdkPixbuf *pixbuf = gtk_icon_info_load_icon(icon->info, &error);
+    if(pixbuf) {
+        UiImage *img = malloc(sizeof(UiImage));
+        img->pixbuf = pixbuf;
+        return img;
+    }
+    return NULL;
+}
+
+UiImage* ui_image(const char *filename) {
+    return ui_named_image(filename, NULL);
+}
+
+UiImage* ui_named_image(const char *filename, const char *name) {
+    char *path =  uic_get_image_path(filename);
+    if(!path) {
+        fprintf(stderr, "UiError: pixmaps directory not set\n");
+        return NULL;
+    }
+    UiImage *img = ui_load_image_from_path(path, name);
+    free(path);
+    return img;
+}
+
+UiImage* ui_load_image_from_path(const char *path, const char *name) {
+    GError *error = NULL;
+    GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(path, &error);
+    if(!pixbuf) {
+        fprintf(stderr, "UiError: Cannot load image: %s\n", path);
+        return NULL;
+    }
+    
+    UiImage *img = malloc(sizeof(UiImage));
+    img->pixbuf = pixbuf;
+    if(name) {
+        ucx_map_cstr_put(image_map, name, img);
+    }
+    return img;
+}
+
+void ui_free_image(UiImage *img) {
+    g_object_unref(img->pixbuf);
+    free(img);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/image.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,61 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef IMAGE_H
+#define	IMAGE_H
+
+#include "../ui/image.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#if GTK_MAJOR_VERSION >= 3 && GTK_MINOR_VERSION >= 10
+#define UI_SUPPORTS_SCALE
+#endif
+
+    
+struct UiIcon {
+    GtkIconInfo *info;
+};
+
+struct UiImage {
+    GdkPixbuf *pixbuf;
+};
+
+void ui_image_init(void);
+
+GdkPixbuf* ui_get_image(char *name);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* IMAGE_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/menu.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,609 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <stdarg.h>
+
+#include "menu.h"
+#include "toolkit.h"
+#include "../common/context.h"
+#include "../ui/properties.h"
+#include "../ui/window.h"
+#include "container.h"
+
+static UcxList *menus;
+static UcxList *current;
+
+void ui_menu(char *label) {
+    // free current menu hierarchy
+    ucx_list_free(current);
+    
+    // create menu
+    UiMenu *menu = malloc(sizeof(UiMenu));
+    menu->item.add_to = (ui_menu_add_f)add_menu_widget;
+    
+    menu->label  = label;
+    menu->items  = NULL;
+    menu->parent = NULL;    
+    
+    current = ucx_list_prepend(NULL, menu);
+    menus = ucx_list_append(menus, menu);
+    
+}
+
+void ui_submenu(char *label) {
+    UiMenu *menu = malloc(sizeof(UiMenu));
+    menu->item.add_to = (ui_menu_add_f)add_menu_widget;
+    
+    menu->label  = label;
+    menu->items  = NULL;
+    menu->parent = NULL;
+    
+    // add submenu to current menu
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, menu);
+    
+    // set the submenu to current menu
+    current = ucx_list_prepend(current, menu);
+}
+
+void ui_submenu_end() {
+    if(ucx_list_size(current) < 2) {
+        return;
+    }
+    current = ucx_list_remove(current, current);
+    //UcxList *c = current;
+}
+
+void ui_menuitem(char *label, ui_callback f, void *userdata) {
+    ui_menuitem_gr(label, f, userdata, -1);
+}
+
+void ui_menuitem_st(char *stockid, ui_callback f, void *userdata) {
+    ui_menuitem_stgr(stockid, f, userdata, -1);
+}
+
+void ui_menuitem_gr(char *label, ui_callback f, void *userdata, ...) {
+    if(!current) {
+        return;
+    }
+    
+    UiMenuItem *item = malloc(sizeof(UiMenuItem));
+    item->item.add_to = (ui_menu_add_f)add_menuitem_widget;
+    
+    item->label = label;
+    item->userdata = userdata;
+    item->callback = f;
+    item->groups = NULL;
+    
+    // add groups
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->groups = ucx_list_append(item->groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, item);
+}
+
+void ui_menuitem_stgr(char *stockid, ui_callback f, void *userdata, ...) {
+    if(!current) {
+        return;
+    }
+    
+    UiStMenuItem *item = malloc(sizeof(UiStMenuItem));
+    item->item.add_to = (ui_menu_add_f)add_menuitem_st_widget;
+    
+    item->stockid = stockid;
+    item->userdata = userdata;
+    item->callback = f;
+    item->groups = NULL;
+    
+    // add groups
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->groups = ucx_list_append(item->groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, item);
+}
+
+void ui_menuseparator() {
+    if(!current) {
+        return;
+    }
+    
+    UiMenuItemI  *item = malloc(sizeof(UiMenuItemI));
+    item->add_to = (ui_menu_add_f)add_menuseparator_widget;
+    
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, item);
+}
+
+void ui_checkitem(char *label, ui_callback f, void *userdata) {
+    if(!current) {
+        return;
+    }
+    
+    UiCheckItem *item = malloc(sizeof(UiCheckItem));
+    item->item.add_to = (ui_menu_add_f)add_checkitem_widget;
+    item->label = label;
+    item->callback = f;
+    item->userdata = userdata;
+    
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, item);
+}
+
+void ui_checkitem_nv(char *label, char *vname) {
+    if(!current) {
+        return;
+    }
+    
+    UiCheckItemNV *item = malloc(sizeof(UiCheckItemNV));
+    item->item.add_to = (ui_menu_add_f)add_checkitemnv_widget;
+    item->varname = vname;
+    item->label = label;
+    
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, item);
+}
+
+void ui_menuitem_list(UiList *items, ui_callback f, void *userdata) {
+    if(!current) {
+        return;
+    }
+    
+    UiMenuItemList *item = malloc(sizeof(UiMenuItemList));
+    item->item.add_to = (ui_menu_add_f)add_menuitem_list_widget;
+    item->callback = f;
+    item->userdata = userdata;
+    item->list = items;
+    
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, item);
+}
+
+// private menu functions
+GtkWidget *ui_create_menubar(UiObject *obj) {
+    if(menus == NULL) {
+        return NULL;
+    }
+    
+    GtkWidget *mb = gtk_menu_bar_new();
+    
+    UcxList *ls = menus;
+    while(ls) {
+        UiMenu *menu = ls->data;
+        menu->item.add_to(mb, 0, &menu->item, obj);
+        
+        ls = ls->next;
+    }
+    
+    return mb;
+}
+
+void add_menu_widget(GtkWidget *parent, int i, UiMenuItemI *item, UiObject *obj) {
+    UiMenu *menu = (UiMenu*)item;
+    
+    GtkWidget *menu_widget = gtk_menu_new();
+    GtkWidget *menu_item = gtk_menu_item_new_with_mnemonic(menu->label);
+    gtk_menu_item_set_submenu(GTK_MENU_ITEM(menu_item), menu_widget);
+    
+    UcxList *ls = menu->items;
+    int index = 0;
+    while(ls) {
+        UiMenuItemI *i = ls->data;
+        i->add_to(menu_widget, index, i, obj);
+        
+        ls = ls->next;
+        index++;
+    }
+    
+    gtk_menu_shell_append(GTK_MENU_SHELL(parent), menu_item);
+}
+
+void add_menuitem_widget(GtkWidget *parent, int index, UiMenuItemI *item, UiObject *obj) {
+    UiMenuItem *i = (UiMenuItem*)item;
+    
+    //GtkWidget *widget = gtk_menu_item_new_with_label(i->title);
+    GtkWidget *widget = gtk_menu_item_new_with_mnemonic(i->label);
+    
+    if(i->callback != NULL) {
+        UiEventData *event = malloc(sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = i->userdata;
+        event->callback = i->callback;
+        event->value = 0;
+
+        g_signal_connect(
+                widget,
+                "activate",
+                G_CALLBACK(ui_menu_event_wrapper),
+                event);
+        g_signal_connect(
+                widget,
+                "destroy",
+                G_CALLBACK(ui_destroy_userdata),
+                event);
+    }
+    
+    gtk_menu_shell_append(GTK_MENU_SHELL(parent), widget);
+    
+    if(i->groups) {
+        uic_add_group_widget(obj->ctx, widget, i->groups);
+    }
+}
+
+void add_menuitem_st_widget(
+        GtkWidget *parent,
+        int index,
+        UiMenuItemI *item,
+        UiObject *obj)
+{
+    UiStMenuItem *i = (UiStMenuItem*)item;
+    
+    GtkWidget *widget = gtk_image_menu_item_new_from_stock(i->stockid, obj->ctx->accel_group);
+    
+    if(i->callback != NULL) {
+        UiEventData *event = malloc(sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = i->userdata;
+        event->callback = i->callback;
+        event->value = 0;
+
+        g_signal_connect(
+                widget,
+                "activate",
+                G_CALLBACK(ui_menu_event_wrapper),
+                event);
+        g_signal_connect(
+                widget,
+                "destroy",
+                G_CALLBACK(ui_destroy_userdata),
+                event);
+    }
+    
+    gtk_menu_shell_append(GTK_MENU_SHELL(parent), widget);
+    
+    if(i->groups) {
+        uic_add_group_widget(obj->ctx, widget, i->groups);
+    }
+}
+
+void add_menuseparator_widget(
+        GtkWidget *parent,
+        int index,
+        UiMenuItemI *item,
+        UiObject *obj)
+{
+    gtk_menu_shell_append(
+            GTK_MENU_SHELL(parent),
+            gtk_separator_menu_item_new());
+}
+
+void add_checkitem_widget(GtkWidget *p, int index, UiMenuItemI *item, UiObject *obj) {
+    UiCheckItem *ci = (UiCheckItem*)item;
+    GtkWidget *widget = gtk_check_menu_item_new_with_mnemonic(ci->label);
+    gtk_menu_shell_append(GTK_MENU_SHELL(p), widget);
+    
+    if(ci->callback) {
+        UiEventData *event = malloc(sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = ci->userdata;
+        event->callback = ci->callback;
+        event->value = 0;
+
+        g_signal_connect(
+                widget,
+                "toggled",
+                G_CALLBACK(ui_menu_event_toggled),
+                event);
+        g_signal_connect(
+                widget,
+                "destroy",
+                G_CALLBACK(ui_destroy_userdata),
+                event);
+    }
+}
+
+void add_checkitemnv_widget(GtkWidget *p, int index, UiMenuItemI *item, UiObject *obj) {
+    UiCheckItemNV *ci = (UiCheckItemNV*)item;
+    GtkWidget *widget = gtk_check_menu_item_new_with_mnemonic(ci->label);
+    gtk_menu_shell_append(GTK_MENU_SHELL(p), widget);
+    
+    UiVar *var = uic_create_var(obj->ctx, ci->varname, UI_VAR_INTEGER);
+    if(var) {
+        UiInteger *value = var->value;
+        value->obj = widget;
+        value->get = ui_checkitem_get;
+        value->set = ui_checkitem_set;
+        value = 0;
+    } else {
+        // TODO: error
+    }
+}
+
+void add_menuitem_list_widget(GtkWidget *p, int index, UiMenuItemI *item, UiObject *obj) {
+    UiMenuItemList *il = (UiMenuItemList*)item;
+    UcxMempool *mp = obj->ctx->mempool;
+    
+    UiActiveMenuItemList *ls = ucx_mempool_malloc(
+            mp,
+            sizeof(UiActiveMenuItemList));
+    
+    ls->object = obj;
+    ls->menu = GTK_MENU_SHELL(p);
+    ls->index = index;
+    ls->oldcount = 0;
+    ls->list = il->list;
+    ls->callback = il->callback;
+    ls->userdata = il->userdata;
+    
+    ls->list->observers = ui_add_observer(
+            ls->list->observers,
+            (ui_callback)ui_update_menuitem_list,
+            ls);
+    
+    ui_update_menuitem_list(NULL, ls);
+}
+
+
+void ui_update_menuitem_list(UiEvent *event, UiActiveMenuItemList *list) {    
+    // remove old items
+    if(list->oldcount > 0) {
+        int i = 0;
+        GList *mi = gtk_container_get_children(GTK_CONTAINER(list->menu));
+        while(mi) {
+            if(i >= list->index && i < list->index + list->oldcount) {
+                //gtk_container_remove(GTK_CONTAINER(list->menu), mi->data);
+                gtk_widget_destroy(mi->data);
+            }
+            mi = mi->next;
+            i++;
+        }
+    }
+    
+    char *str = ui_list_first(list->list);
+    if(str) {
+        GtkWidget *widget = gtk_separator_menu_item_new();
+        gtk_menu_shell_insert(list->menu, widget, list->index);
+        gtk_widget_show(widget);
+    }
+    int i = 1;
+    while(str) {
+        GtkWidget *widget = gtk_menu_item_new_with_label(str);
+        gtk_menu_shell_insert(list->menu, widget, list->index + i);
+        gtk_widget_show(widget);
+        
+        if(list->callback) {
+            // TODO: use mempool
+            UiEventData *event = malloc(sizeof(UiEventData));
+            event->obj = list->object;
+            event->userdata = list->userdata;
+            event->callback = list->callback;
+            event->value = i - 1;
+
+            g_signal_connect(
+                widget,
+                "activate",
+                G_CALLBACK(ui_menu_event_wrapper),
+                event);
+            g_signal_connect(
+                widget,
+                "destroy",
+                G_CALLBACK(ui_destroy_userdata),
+                event);
+        }
+        
+        str = ui_list_next(list->list);
+        i++;
+    }
+    
+    list->oldcount = i;
+}
+
+void ui_menu_event_wrapper(GtkMenuItem *item, UiEventData *event) {
+    UiEvent evt;
+    evt.obj = event->obj;
+    evt.window = event->obj->window;
+    evt.document = event->obj->ctx->document;
+    evt.eventdata = NULL;
+    evt.intval = event->value;
+    event->callback(&evt, event->userdata);    
+}
+
+void ui_menu_event_toggled(GtkCheckMenuItem *ci, UiEventData *event) {
+    UiEvent evt;
+    evt.obj = event->obj;
+    evt.window = event->obj->window;
+    evt.document = event->obj->ctx->document;
+    evt.eventdata = NULL;
+    evt.intval = gtk_check_menu_item_get_active(ci);
+    event->callback(&evt, event->userdata);    
+}
+
+int64_t ui_checkitem_get(UiInteger *i) {
+    int state = gtk_check_menu_item_get_active(i->obj);
+    i->value = state;
+    return state;
+}
+
+void ui_checkitem_set(UiInteger *i, int64_t value) {
+    i->value = value;
+    gtk_check_menu_item_set_active(i->obj, value);
+}
+
+
+/*
+ * widget menu functions
+ */
+
+static gboolean ui_button_press_event(GtkWidget *widget, GdkEvent *event, GtkMenu *menu) {
+    if(event->type == GDK_BUTTON_PRESS) {
+        GdkEventButton *e = (GdkEventButton*)event;
+        if(e->button == 3) {
+            gtk_widget_show_all(GTK_WIDGET(menu));
+            ui_contextmenu_popup(menu);
+            return TRUE;
+        }
+    }
+    return FALSE;
+}
+
+UIMENU ui_contextmenu(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    return ui_contextmenu_w(obj, ct->current);
+}
+
+UIMENU ui_contextmenu_w(UiObject *obj, UIWIDGET widget) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    GtkMenu *menu = GTK_MENU(gtk_menu_new());
+    g_signal_connect(widget, "button-press-event", (GCallback) ui_button_press_event, menu);
+    
+    ct->menu = menu;
+    return menu;
+}
+
+void ui_contextmenu_popup(UIMENU menu) {
+#if GTK_MAJOR_VERSION >= 3 && GTK_MINOR_VERSION >= 16
+    gtk_menu_popup_at_pointer(menu, NULL);
+#else
+    gtk_menu_popup(menu, NULL, NULL, 0, 0, 0, gtk_get_current_event_time());
+#endif
+}
+
+void ui_widget_menuitem(UiObject *obj, char *label, ui_callback f, void *userdata) {
+    ui_widget_menuitem_gr(obj, label, f, userdata, -1);
+}
+
+void ui_widget_menuitem_gr(UiObject *obj, char *label, ui_callback f, void *userdata, ...) {
+    UiContainer *ct = uic_get_current_container(obj);
+    if(!ct->menu) {
+        return;
+    }
+    
+    // add groups
+    UcxList *groups = NULL;
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        ucx_list_append(groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    // create menuitem
+    GtkWidget *widget = gtk_menu_item_new_with_mnemonic(label);
+    gtk_widget_show(widget);
+    
+    if(f) {
+        UiEventData *event = malloc(sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = userdata;
+        event->callback = f;
+        event->value = 0;
+
+        g_signal_connect(
+                widget,
+                "activate",
+                G_CALLBACK(ui_menu_event_wrapper),
+                event);
+        g_signal_connect(
+                widget,
+                "destroy",
+                G_CALLBACK(ui_destroy_userdata),
+                event);
+    }
+    
+    gtk_menu_shell_append(GTK_MENU_SHELL(ct->menu), widget);
+    
+    if(groups) {
+        uic_add_group_widget(obj->ctx, widget, groups);
+    }
+}
+
+void ui_widget_menuitem_st(UiObject *obj, char *stockid, ui_callback f, void *userdata) {
+    ui_widget_menuitem_stgr(obj, stockid, f, userdata, -1);
+}
+
+void ui_widget_menuitem_stgr(UiObject *obj, char *stockid, ui_callback f, void *userdata, ...) {
+    UiContainer *ct = uic_get_current_container(obj);
+    if(!ct->menu) {
+        return;
+    }
+    
+    // add groups
+    UcxList *groups = NULL;
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        ucx_list_append(groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    // create menuitem
+    GtkWidget *widget = gtk_image_menu_item_new_from_stock(stockid, obj->ctx->accel_group);
+    gtk_widget_show(widget);
+    
+    if(f) {
+        UiEventData *event = malloc(sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = userdata;
+        event->callback = f;
+        event->value = 0;
+
+        g_signal_connect(
+                widget,
+                "activate",
+                G_CALLBACK(ui_menu_event_wrapper),
+                event);
+        g_signal_connect(
+                widget,
+                "destroy",
+                G_CALLBACK(ui_destroy_userdata),
+                event);
+    }
+    
+    gtk_menu_shell_append(GTK_MENU_SHELL(ct->menu), widget);
+    
+    if(groups) {
+        uic_add_group_widget(obj->ctx, widget, groups);
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/menu.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,130 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef MENU_H
+#define	MENU_H
+
+#include "../ui/menu.h"
+#include <ucx/list.h>
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+    
+typedef struct UiMenuItemI      UiMenuItemI;
+typedef struct UiMenu           UiMenu;
+typedef struct UiMenuItem       UiMenuItem;
+typedef struct UiStMenuItem     UiStMenuItem;
+typedef struct UiCheckItem      UiCheckItem;
+typedef struct UiCheckItemNV    UiCheckItemNV;
+typedef struct UiMenuItemList   UiMenuItemList;
+
+typedef struct UiActiveMenuItemList UiActiveMenuItemList;
+
+typedef GtkWidget*(*ui_menu_add_f)(GtkWidget *, int, UiMenuItemI*, UiObject*);
+    
+struct UiMenuItemI {
+    ui_menu_add_f  add_to;
+};
+
+struct UiMenu {
+    UiMenuItemI    item;
+    char           *label;
+    UcxList        *items;
+    UiMenu         *parent;
+};
+
+struct UiMenuItem {
+    UiMenuItemI    item;
+    ui_callback    callback;
+    char           *label;
+    void           *userdata;
+    UcxList        *groups;
+};
+
+struct UiStMenuItem {
+    UiMenuItemI    item;
+    ui_callback    callback;
+    char           *stockid;
+    void           *userdata;
+    UcxList        *groups;
+};
+
+struct UiCheckItem {
+    UiMenuItemI    item;
+    char           *label;
+    ui_callback    callback;
+    void           *userdata;
+};
+
+struct UiCheckItemNV {
+    UiMenuItemI    item;
+    char           *label;
+    char           *varname;
+};
+
+struct UiMenuItemList {
+    UiMenuItemI    item;
+    ui_callback    callback;
+    void           *userdata;
+    UiList         *list;
+};
+
+struct UiActiveMenuItemList {
+    UiObject     *object;
+    GtkMenuShell *menu;
+    int          index;
+    int          oldcount;
+    UiList       *list;
+    ui_callback  callback;
+    void         *userdata;
+};
+
+GtkWidget *ui_create_menubar(UiObject *obj);
+
+void add_menu_widget(GtkWidget *parent, int i, UiMenuItemI *item, UiObject *obj);
+void add_menuitem_widget(GtkWidget *parent, int i, UiMenuItemI *item, UiObject *obj);
+void add_menuitem_st_widget(GtkWidget *p, int i, UiMenuItemI *item, UiObject *obj);
+void add_menuseparator_widget(GtkWidget *p, int i, UiMenuItemI *item, UiObject *obj);
+void add_checkitem_widget(GtkWidget *p, int i, UiMenuItemI *item, UiObject *obj);
+void add_checkitemnv_widget(GtkWidget *p, int i, UiMenuItemI *item, UiObject *obj);
+void add_menuitem_list_widget(GtkWidget *p, int i, UiMenuItemI *item, UiObject *obj);
+
+void ui_update_menuitem_list(UiEvent *event, UiActiveMenuItemList *list);
+void ui_menu_event_wrapper(GtkMenuItem *item, UiEventData *event);
+void ui_menu_event_toggled(GtkCheckMenuItem *ci, UiEventData *event);
+int64_t ui_checkitem_get(UiInteger *i);
+void ui_checkitem_set(UiInteger *i, int64_t value);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* MENU_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/model.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,539 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "model.h"
+#include "image.h"
+#include "toolkit.h"
+
+#define IS_UI_LIST_MODEL(obj) \
+        (G_TYPE_CHECK_INSTANCE_TYPE((obj), list_model_type))
+#define UI_LIST_MODEL(obj) \
+        (G_TYPE_CHECK_INSTANCE_CAST((obj), list_model_type, UiListModel))
+
+static void list_model_class_init(GObjectClass *cl, gpointer data);
+static void list_model_interface_init(GtkTreeModelIface *i, gpointer data);
+static void list_model_init(UiListModel *instance, GObjectClass *cl);
+
+static void list_model_dnd_dest_interface_init(GtkTreeDragDestIface *i, gpointer data);
+static void list_model_dnd_src_interface_init(GtkTreeDragSourceIface *i, gpointer data);
+
+static GObjectClass list_model_class;
+static const GTypeInfo list_model_info = {
+    sizeof(GObjectClass),
+    NULL,
+    NULL,
+    (GClassInitFunc)list_model_class_init,
+    NULL,
+    NULL,
+    sizeof(UiListModel),
+    0,
+    (GInstanceInitFunc)list_model_init
+};
+static const GInterfaceInfo list_model_interface_info = {
+    (GInterfaceInitFunc)list_model_interface_init,
+    NULL,
+    NULL
+};
+static GType list_model_type;
+
+static const GInterfaceInfo list_model_dnd_dest_interface_info = {
+    (GInterfaceInitFunc)list_model_dnd_dest_interface_init,
+    NULL,
+    NULL
+};
+static const GInterfaceInfo list_model_dnd_src_interface_info = {
+    (GInterfaceInitFunc)list_model_dnd_src_interface_init,
+    NULL,
+    NULL
+};
+
+void ui_list_init() {
+    list_model_type = g_type_register_static(
+            G_TYPE_OBJECT,
+            "UiListModel",
+            &list_model_info,
+            (GTypeFlags)0);
+    g_type_add_interface_static(
+            list_model_type,
+            GTK_TYPE_TREE_MODEL,
+            &list_model_interface_info);
+    g_type_add_interface_static(
+            list_model_type,
+            GTK_TYPE_TREE_DRAG_DEST,
+            &list_model_dnd_dest_interface_info);
+    g_type_add_interface_static(
+            list_model_type,
+            GTK_TYPE_TREE_DRAG_SOURCE,
+            &list_model_dnd_src_interface_info);
+}
+
+static void list_model_class_init(GObjectClass *cl, gpointer data) {
+    cl->dispose = ui_list_model_dispose;
+    cl->finalize = ui_list_model_finalize;
+    
+}
+
+static void list_model_interface_init(GtkTreeModelIface *i, gpointer data) {
+    i->get_flags       = ui_list_model_get_flags;
+    i->get_n_columns   = ui_list_model_get_n_columns;
+    i->get_column_type = ui_list_model_get_column_type;
+    i->get_iter        = ui_list_model_get_iter;
+    i->get_path        = ui_list_model_get_path;
+    i->get_value       = ui_list_model_get_value;
+    i->iter_next       = ui_list_model_iter_next;
+    i->iter_children   = ui_list_model_iter_children;
+    i->iter_has_child  = ui_list_model_iter_has_child;
+    i->iter_n_children = ui_list_model_iter_n_children;
+    i->iter_nth_child  = ui_list_model_iter_nth_child;
+    i->iter_parent     = ui_list_model_iter_parent;
+}
+
+static void list_model_dnd_dest_interface_init(GtkTreeDragDestIface *i, gpointer data) {
+    i->drag_data_received = ui_list_model_drag_data_received;
+    i->row_drop_possible = ui_list_model_row_drop_possible;
+}
+
+static void list_model_dnd_src_interface_init(GtkTreeDragSourceIface *i, gpointer data) {
+    i->drag_data_delete = ui_list_model_drag_data_delete;
+    i->drag_data_get = ui_list_model_drag_data_get;
+    i->row_draggable = ui_list_model_row_draggable;
+}
+
+static void list_model_init(UiListModel *instance, GObjectClass *cl) {
+    instance->columntypes = NULL;
+    instance->var = NULL;
+    instance->numcolumns = 0;
+    instance->stamp = g_random_int();
+}
+
+static GType ui_gtk_type(UiModelType type) {
+    switch(type) {
+        default: break;
+        case UI_STRING: return G_TYPE_STRING;
+        case UI_INTEGER: return G_TYPE_INT;
+    }
+    return G_TYPE_INVALID;
+}
+
+static void ui_model_set_value(GType type, void *data, GValue *value) {
+    switch(type) {
+        default: break;
+        case G_TYPE_OBJECT: {
+            value->g_type = G_TYPE_OBJECT;
+            g_value_set_object(value, data);
+            return;
+        }
+        case G_TYPE_STRING: {
+            value->g_type = G_TYPE_STRING;
+            g_value_set_string(value, data);
+            return;
+        }
+        case G_TYPE_INT: {
+            value->g_type = G_TYPE_INT;
+            int *i = data;
+            g_value_set_int(value, *i);
+            return;
+        }
+    }
+    value->g_type = G_TYPE_INVALID; 
+}
+
+UiListModel* ui_list_model_new(UiObject *obj, UiVar *var, UiModel *info) {
+    UiListModel *model = g_object_new(list_model_type, NULL);
+    model->obj = obj;
+    model->model = info;
+    model->var = var;
+    model->columntypes = calloc(sizeof(GType), 2 * info->columns);
+    int ncol = 0;
+    for(int i=0;i<info->columns;i++) {
+        UiModelType type = info->types[i];
+        if(type == UI_ICON_TEXT) {
+            model->columntypes[ncol] = G_TYPE_OBJECT;
+            ncol++;
+            model->columntypes[ncol] = G_TYPE_STRING;
+        } else {
+            model->columntypes[ncol] = ui_gtk_type(info->types[i]);
+        }
+        ncol++;
+    }
+    model->numcolumns = ncol;
+    return model;
+}
+
+void ui_list_model_dispose(GObject *obj) {
+    
+}
+
+void ui_list_model_finalize(GObject *obj) {
+    
+}
+
+
+GtkTreeModelFlags ui_list_model_get_flags(GtkTreeModel *tree_model) {
+    return (GTK_TREE_MODEL_LIST_ONLY | GTK_TREE_MODEL_ITERS_PERSIST);
+}
+
+gint ui_list_model_get_n_columns(GtkTreeModel *tree_model) {
+    g_return_val_if_fail(IS_UI_LIST_MODEL(tree_model), 0);
+    UiListModel *model = UI_LIST_MODEL(tree_model);
+    return model->numcolumns;
+}
+
+GType ui_list_model_get_column_type(GtkTreeModel *tree_model, gint index) {
+    g_return_val_if_fail(IS_UI_LIST_MODEL(tree_model), G_TYPE_INVALID);
+    UiListModel *model = UI_LIST_MODEL(tree_model);
+    g_return_val_if_fail(index < model->numcolumns, G_TYPE_INVALID);
+    return model->columntypes[index];
+}
+
+gboolean ui_list_model_get_iter(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter,
+        GtkTreePath *path)
+{
+    g_assert(IS_UI_LIST_MODEL(tree_model));
+    UiListModel *model = UI_LIST_MODEL(tree_model);
+    UiList *list = model->var->value;
+    
+    // check the depth of the path
+    // a list must have a depth of 1
+    gint depth = gtk_tree_path_get_depth(path);
+    g_assert(depth == 1);
+    
+    // get row
+    gint *indices = gtk_tree_path_get_indices(path);
+    gint row = indices[0];
+    
+    // check row
+    if(row == 0) {
+        // we don't need to count if the first element is requested
+        if(list->first(list) == NULL) {
+            return FALSE;
+        }
+    } else if(row >= list->count(list)) {
+        return FALSE;
+    }
+    
+    // the UiList has an integrated iterator
+    // we only get a value to adjust it
+    void *val = NULL;
+    if(row == 0) {
+        val = list->first(list);
+    } else {
+        val = list->get(list, row);
+    }
+    
+    iter->stamp = model->stamp;
+    iter->user_data = list->iter;
+    iter->user_data2 = (gpointer)(intptr_t)row; // list->index
+    iter->user_data3 = val;
+    
+    return val ? TRUE : FALSE;
+}
+
+GtkTreePath* ui_list_model_get_path(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter)
+{
+    g_return_val_if_fail(IS_UI_LIST_MODEL(tree_model), NULL);
+    g_return_val_if_fail(iter != NULL, NULL);
+    g_return_val_if_fail(iter->user_data != NULL, NULL);
+    
+    UiListModel *model = UI_LIST_MODEL(tree_model);
+    
+    GtkTreePath *path = gtk_tree_path_new();
+    gtk_tree_path_append_index(path, (int)(intptr_t)iter->user_data2); // list->index
+    
+    return path;
+}
+
+void ui_list_model_get_value(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter,
+        gint column,
+        GValue *value)
+{
+    g_return_if_fail(IS_UI_LIST_MODEL(tree_model));
+    g_return_if_fail(iter != NULL);
+    g_return_if_fail(iter->user_data != NULL);
+    
+    UiListModel *model = UI_LIST_MODEL(tree_model);
+    UiList *list = model->var->value;
+    
+    g_return_if_fail(column < model->numcolumns);
+    
+    // TODO: return correct value from column
+    
+    //value->g_type = G_TYPE_STRING;
+    list->iter = iter->user_data;
+    //list->index = (int)(intptr_t)iter->user_data2;
+    //list->current = iter->user_data3;
+    if(model->model->getvalue) {
+        void *data = model->model->getvalue(iter->user_data3, column);
+        if(model->columntypes[column] == G_TYPE_OBJECT) {
+            UiImage *img = data;
+            ui_model_set_value(model->columntypes[column], img->pixbuf, value);
+        } else {
+            ui_model_set_value(model->columntypes[column], data, value);
+        }
+    } else {
+        value->g_type = G_TYPE_INVALID;
+    }
+}
+
+gboolean ui_list_model_iter_next(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter)
+{
+    g_return_val_if_fail(IS_UI_LIST_MODEL(tree_model), FALSE);
+    g_return_val_if_fail(iter != NULL, FALSE);
+    //g_return_val_if_fail(iter->user_data != NULL, FALSE);
+    
+    if(!iter->user_data) {
+        return FALSE;
+    }
+    
+    UiListModel *model = UI_LIST_MODEL(tree_model);
+    UiList *list = model->var->value;
+    list->iter = iter->user_data;
+    //list->index = (int)(intptr_t)iter->user_data2;
+    void *val = list->next(list);
+    iter->user_data = list->iter;
+    intptr_t index = (intptr_t)iter->user_data2;
+    index++;
+    //iter->user_data2 = (gpointer)(intptr_t)list->index;
+    iter->user_data2 = (gpointer)index;
+    iter->user_data3 = val;
+    return val ? TRUE : FALSE;
+}
+
+gboolean ui_list_model_iter_children(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter,
+        GtkTreeIter *parent)
+{
+    g_return_val_if_fail(IS_UI_LIST_MODEL(tree_model), FALSE);
+    
+    UiListModel *model = UI_LIST_MODEL(tree_model);
+    UiList *list = model->var->value;
+    
+    if(parent) {
+        return FALSE;
+    }
+    
+    /*
+     * a list element has no children
+     * we set the iter to the first element
+     */
+    void *val = list->first(list);
+    iter->stamp = model->stamp;
+    iter->user_data = list->iter;
+    iter->user_data2 = (gpointer)0;
+    iter->user_data3 = val;
+    
+    return val ? TRUE : FALSE;
+}
+
+gboolean ui_list_model_iter_has_child(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter)
+{
+    return FALSE;
+}
+
+gint ui_list_model_iter_n_children(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter)
+{
+    g_assert(IS_UI_LIST_MODEL(tree_model));
+    
+    if(!iter) {
+        // return number of rows
+        UiListModel *model = UI_LIST_MODEL(tree_model);
+        UiList *list = model->var->value;
+        return list->count(list);
+    }
+    
+    return 0;
+}
+
+gboolean ui_list_model_iter_nth_child(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter,
+        GtkTreeIter *parent,
+        gint n)
+{
+    g_return_val_if_fail(IS_UI_LIST_MODEL(tree_model), FALSE);
+    
+    if(parent) {
+        return FALSE;
+    }
+    
+    UiListModel *model = UI_LIST_MODEL(tree_model);
+    UiList *list = model->var->value;
+    
+    // check n
+    if(n == 0) {
+        // we don't need to count if the first element is requested
+        if(list->first(list) == NULL) {
+            return FALSE;
+        }
+    } else if(n >= list->count(list)) {
+        return FALSE;
+    }
+    
+    void *val = list->get(list, n);
+    iter->stamp = model->stamp;
+    iter->user_data = list->iter;
+    iter->user_data2 = (gpointer)(intptr_t)n; // list->index
+    iter->user_data3 = val;
+    
+    return val ? TRUE : FALSE;
+}
+
+gboolean ui_list_model_iter_parent(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter,
+        GtkTreeIter *child)
+{
+    return FALSE;
+}
+
+// ****** dnd ******
+
+gboolean ui_list_model_drag_data_received(
+        GtkTreeDragDest   *drag_dest,
+        GtkTreePath       *dest_path,
+        GtkSelectionData  *selection_data)
+{
+    //printf("drag received\n");
+    UiListModel *model = UI_LIST_MODEL(drag_dest);
+    if(model->model->drop) {
+        gint *indices = gtk_tree_path_get_indices(dest_path);
+        gint row = indices[0];
+        UiEvent e;
+        e.obj = model->obj;
+        e.window = e.obj->window;
+        e.document = e.obj->ctx->document;
+        e.eventdata = NULL;
+        e.intval = 0;
+        UiSelection s;
+        s.data = selection_data;
+        model->model->drop(&e, &s, model->var->value, row);
+    }
+    return TRUE;
+}
+
+gboolean ui_list_model_row_drop_possible(
+        GtkTreeDragDest   *drag_dest,
+        GtkTreePath       *dest_path,
+	GtkSelectionData  *selection_data)
+{
+    //printf("row_drop_possible\n");
+    UiListModel *model = UI_LIST_MODEL(drag_dest);
+    if(model->model->candrop) {
+        gint *indices = gtk_tree_path_get_indices(dest_path);
+        gint row = indices[0];
+        UiEvent e;
+        e.obj = model->obj;
+        e.window = e.obj->window;
+        e.document = e.obj->ctx->document;
+        e.eventdata = NULL;
+        e.intval = 0;
+        UiSelection s;
+        s.data = selection_data;
+        return model->model->candrop(&e, &s, model->var->value, row);
+    }
+    return TRUE;
+}
+
+gboolean ui_list_model_row_draggable(
+        GtkTreeDragSource   *drag_source,
+        GtkTreePath         *path)
+{
+    //printf("row_draggable\n");
+    UiListModel *model = UI_LIST_MODEL(drag_source);
+    if(model->model->candrag) {
+        gint *indices = gtk_tree_path_get_indices(path);
+        gint row = indices[0];
+        UiEvent e;
+        e.obj = model->obj;
+        e.window = e.obj->window;
+        e.document = e.obj->ctx->document;
+        e.eventdata = NULL;
+        e.intval = 0;
+        return model->model->candrag(&e, model->var->value, row);
+    }
+    return TRUE;
+}
+
+gboolean ui_list_model_drag_data_get(
+        GtkTreeDragSource   *drag_source,
+        GtkTreePath         *path,
+        GtkSelectionData    *selection_data)
+{
+    //printf("drag_data_get\n");
+    UiListModel *model = UI_LIST_MODEL(drag_source);
+    if(model->model->data_get) {
+        gint *indices = gtk_tree_path_get_indices(path);
+        gint row = indices[0];
+        UiEvent e;
+        e.obj = model->obj;
+        e.window = e.obj->window;
+        e.document = e.obj->ctx->document;
+        e.eventdata = NULL;
+        e.intval = 0;
+        UiSelection s;
+        s.data = selection_data;
+        model->model->data_get(&e, &s, model->var->value, row);
+    }
+    return TRUE;
+}
+
+gboolean ui_list_model_drag_data_delete(
+        GtkTreeDragSource *drag_source,
+        GtkTreePath       *path)
+{
+    //printf("drag_data_delete\n");
+    UiListModel *model = UI_LIST_MODEL(drag_source);
+    if(model->model->data_get) {
+        gint *indices = gtk_tree_path_get_indices(path);
+        gint row = indices[0];
+        UiEvent e;
+        e.obj = model->obj;
+        e.window = e.obj->window;
+        e.document = e.obj->ctx->document;
+        e.eventdata = NULL;
+        e.intval = 0;
+        model->model->data_delete(&e, model->var->value, row);
+    }
+    return TRUE;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/model.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,149 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef MODEL_H
+#define	MODEL_H
+
+#include "../ui/toolkit.h"
+#include "../common/context.h"
+#include "../ui/tree.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif    
+
+typedef struct UiListModel        UiListModel;
+
+/*
+ * UiList to GtkTreeModel wrapper
+ */
+struct UiListModel {
+    GObject  object;
+    UiObject *obj;
+    UiModel  *model;
+    UiVar   *var;
+    GType    *columntypes;
+    int      numcolumns;
+    int      stamp;
+};
+
+/*
+ * initialize the class and register the type
+ */
+void ui_list_init();
+
+/*
+ * Creates a UiListModel for a given UiList
+ */
+UiListModel* ui_list_model_new(UiObject *obj, UiVar *var, UiModel *info);
+
+void ui_list_model_dispose(GObject *obj);
+void ui_list_model_finalize(GObject *obj);
+
+
+// interface functions
+
+GtkTreeModelFlags ui_list_model_get_flags(GtkTreeModel *tree_model);
+
+gint ui_list_model_get_n_columns(GtkTreeModel *tree_model);
+
+GType ui_list_model_get_column_type(GtkTreeModel *tree_model, gint index);
+
+gboolean ui_list_model_get_iter(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter,
+        GtkTreePath *path);
+
+GtkTreePath* ui_list_model_get_path(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter);
+
+void ui_list_model_get_value(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter,
+        gint column,
+        GValue *value);
+
+gboolean ui_list_model_iter_next(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter);
+
+gboolean ui_list_model_iter_children(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter,
+        GtkTreeIter *parent);
+
+gboolean ui_list_model_iter_has_child(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter);
+
+gint ui_list_model_iter_n_children(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter);
+
+gboolean ui_list_model_iter_nth_child(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter,
+        GtkTreeIter *parent,
+        gint n);
+
+gboolean ui_list_model_iter_parent(
+        GtkTreeModel *tree_model,
+        GtkTreeIter *iter,
+        GtkTreeIter *child);
+
+/* dnd */
+
+gboolean ui_list_model_drag_data_received(
+        GtkTreeDragDest   *drag_dest,
+        GtkTreePath       *dest,
+        GtkSelectionData  *selection_data);
+
+gboolean ui_list_model_row_drop_possible(
+        GtkTreeDragDest   *drag_dest,
+        GtkTreePath       *dest_path,
+	GtkSelectionData  *selection_data);
+
+gboolean ui_list_model_row_draggable(
+        GtkTreeDragSource   *drag_source,
+        GtkTreePath         *path);
+
+gboolean ui_list_model_drag_data_get(
+        GtkTreeDragSource   *drag_source,
+        GtkTreePath         *path,
+        GtkSelectionData    *selection_data);
+
+gboolean ui_list_model_drag_data_delete(
+        GtkTreeDragSource *drag_source,
+        GtkTreePath       *path);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* MODEL_H */
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/objs.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,50 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2017 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+GTK_SRC_DIR = ui/gtk/
+GTK_OBJPRE = $(OBJ_DIR)$(GTK_SRC_DIR)
+
+# some objects are defined in config.mk
+GTKOBJ += toolkit.o
+GTKOBJ += window.o
+GTKOBJ += container.o
+GTKOBJ += menu.o
+GTKOBJ += toolbar.o
+GTKOBJ += button.o
+GTKOBJ += display.o
+GTKOBJ += text.o
+GTKOBJ += model.o
+GTKOBJ += tree.o
+GTKOBJ += image.o
+GTKOBJ += graphics.o
+GTKOBJ += range.o
+GTKOBJ += entry.o
+GTKOBJ += dnd.o
+
+TOOLKITOBJS += $(GTKOBJ:%=$(GTK_OBJPRE)%)
+TOOLKITSOURCE += $(GTKOBJ:%.o=gtk/%.c)
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/range.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,131 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "range.h"
+#include "container.h"
+#include <ucx/mempool.h>
+#include "../common/context.h"
+#include "../common/object.h"
+
+
+static UIWIDGET ui_scrollbar(UiObject *obj, UiOrientation orientation, UiRange *range, ui_callback f, void *userdata) {
+#ifdef UI_GTK3
+    GtkWidget *scrollbar = gtk_scrollbar_new(orientation == UI_HORIZONTAL ? GTK_ORIENTATION_HORIZONTAL : GTK_ORIENTATION_VERTICAL, NULL);
+#else
+    GtkWidget *scrollbar;
+    if(orientation == UI_HORIZONTAL) {
+        scrollbar = gtk_hscrollbar_new(NULL);
+    } else {
+        scrollbar = gtk_hscrollbar_new(NULL);
+    }
+#endif
+    
+    if(range) {
+        range->get = ui_scrollbar_get;
+        range->set = ui_scrollbar_set;
+        range->setrange = ui_scrollbar_setrange;
+        range->setextent = ui_scrollbar_setextent;
+        range->obj = scrollbar;
+    }
+    
+    if(f) {
+        UiEventData *event = malloc(sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = userdata;
+        event->callback = f;
+        event->value = 0;
+        
+        g_signal_connect(
+                G_OBJECT(scrollbar),
+                "value-changed",
+                G_CALLBACK(ui_scrollbar_value_changed),
+                event);
+        g_signal_connect(
+                scrollbar,
+                "destroy",
+                G_CALLBACK(ui_destroy_userdata),
+                event);
+    }
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, scrollbar, FALSE);
+    
+    return scrollbar;
+}
+
+UIWIDGET ui_hscrollbar(UiObject *obj, UiRange *range, ui_callback f, void *userdata) {
+    return ui_scrollbar(obj, UI_HORIZONTAL, range, f, userdata);
+}
+
+UIWIDGET ui_vscrollbar(UiObject *obj, UiRange *range, ui_callback f, void *userdata) {
+    return ui_scrollbar(obj, UI_VERTICAL, range, f, userdata);
+}
+
+gboolean ui_scrollbar_value_changed(GtkRange *range, UiEventData *event) {
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.eventdata = NULL;
+    e.intval = event->value;
+    event->callback(&e, event->userdata); 
+    return TRUE;
+}
+
+double ui_scrollbar_get(UiRange *range) {
+    double value = gtk_range_get_value(GTK_RANGE(range->obj));
+    range->value = value;
+    return value;
+}
+
+void   ui_scrollbar_set(UiRange *range, double value) {
+    gtk_range_set_value(GTK_RANGE(range->obj), value);
+    range->value = value;
+}
+
+void   ui_scrollbar_setrange(UiRange *range, double min, double max) {
+    gtk_range_set_range(GTK_RANGE(range->obj), min, max);
+    range->min = min;
+    range->max = max;
+}
+
+void   ui_scrollbar_setextent(UiRange *range, double extent) {
+    GtkAdjustment *a = gtk_range_get_adjustment(GTK_RANGE(range->obj));
+#ifdef UI_GTK2LEGACY
+    a->page_size = extent;
+#else
+    gtk_adjustment_set_page_size(a, extent);
+#endif
+#if !(GTK_MAJOR_VERSION >= 3 && GTK_MINOR_VERSION >= 18)
+    gtk_adjustment_changed(a);
+#endif
+    range->extent = extent;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/range.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,51 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef RANGE_H
+#define RANGE_H
+
+#include "toolkit.h"
+#include "../ui/range.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+gboolean ui_scrollbar_value_changed(GtkRange *range, UiEventData *event);
+    
+double ui_scrollbar_get(UiRange *range);
+void   ui_scrollbar_set(UiRange *range, double value);
+void   ui_scrollbar_setrange(UiRange *range, double min, double max);
+void   ui_scrollbar_setextent(UiRange *range, double extent);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RANGE_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/text.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,651 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "text.h"
+#include "container.h"
+
+
+static void selection_handler(
+        GtkTextBuffer *buf,
+        GtkTextIter *location,
+        GtkTextMark *mark,
+        UiTextArea *textview)
+{
+    const char *mname = gtk_text_mark_get_name(mark);
+    if(mname) {
+        GtkTextIter begin;
+        GtkTextIter end;
+        int sel = gtk_text_buffer_get_selection_bounds (buf, &begin, &end);
+        if(sel != textview->last_selection_state) {
+            if(sel) {
+                ui_set_group(textview->ctx, UI_GROUP_SELECTION);
+            } else {
+                ui_unset_group(textview->ctx, UI_GROUP_SELECTION);
+            }
+        }
+        textview->last_selection_state = sel;
+    }
+}
+
+UIWIDGET ui_textarea_var(UiObject *obj, UiVar *var) {
+    GtkWidget *text_area = gtk_text_view_new();
+    gtk_text_view_set_wrap_mode(GTK_TEXT_VIEW(text_area), GTK_WRAP_WORD_CHAR);
+    g_signal_connect(
+            text_area,
+            "realize",
+            G_CALLBACK(ui_textarea_realize_event),
+            NULL);
+    
+    UiTextArea *uitext = malloc(sizeof(UiTextArea));
+    uitext->ctx = obj->ctx;
+    uitext->var = var;
+    uitext->last_selection_state = 0;
+    
+    g_signal_connect(
+                text_area,
+                "destroy",
+                G_CALLBACK(ui_textarea_destroy),
+                uitext);
+    
+    GtkWidget *scroll_area = gtk_scrolled_window_new (NULL, NULL);
+    gtk_scrolled_window_set_policy(
+            GTK_SCROLLED_WINDOW(scroll_area),
+            GTK_POLICY_AUTOMATIC,
+            GTK_POLICY_AUTOMATIC); // GTK_POLICY_ALWAYS  
+    gtk_container_add(GTK_CONTAINER(scroll_area), text_area);
+    
+    // font and padding
+    PangoFontDescription *font;
+    font = pango_font_description_from_string("Monospace");
+    gtk_widget_modify_font(text_area, font);
+    pango_font_description_free(font);
+    
+    gtk_text_view_set_left_margin(GTK_TEXT_VIEW(text_area), 2);
+    gtk_text_view_set_right_margin(GTK_TEXT_VIEW(text_area), 2);
+    
+    // add
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, scroll_area, TRUE);
+    
+    // bind value
+    UiText *value = var->value;
+    if(value) {
+        GtkTextBuffer *buf = gtk_text_view_get_buffer(GTK_TEXT_VIEW(text_area));
+        
+        if(value->value.ptr) {
+            gtk_text_buffer_set_text(buf, value->value.ptr, -1);
+            value->value.free(value->value.ptr);
+        }
+        
+        value->get = ui_textarea_get;
+        value->set = ui_textarea_set;
+        value->getsubstr = ui_textarea_getsubstr;
+        value->insert = ui_textarea_insert;
+        value->setposition = ui_textarea_setposition;
+        value->position = ui_textarea_position;
+        value->selection = ui_textarea_selection;
+        value->length = ui_textarea_length;
+        value->remove = ui_textarea_remove;
+        value->value.ptr = NULL;
+        value->value.free = NULL;
+        value->obj = buf;
+        if(!value->undomgr) {
+            value->undomgr = ui_create_undomgr();
+        }
+        
+        g_signal_connect(
+                buf,
+                "changed",
+                G_CALLBACK(ui_textbuf_changed),
+                uitext);
+        
+        // register undo manager
+        g_signal_connect(
+                buf,
+                "insert-text",
+                G_CALLBACK(ui_textbuf_insert),
+                var);
+        g_signal_connect(
+                buf,
+                "delete-range",
+                G_CALLBACK(ui_textbuf_delete),
+                var); 
+        g_signal_connect(
+                buf,
+                "mark-set",
+                G_CALLBACK(selection_handler),
+                uitext);
+    }
+    
+    return scroll_area;
+}
+
+void ui_textarea_destroy(GtkWidget *object, UiTextArea *textarea) {
+    ui_destroy_boundvar(textarea->ctx, textarea->var);
+    free(textarea);
+}
+
+UIWIDGET ui_textarea(UiObject *obj, UiText *value) {
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = value;
+    var->type = UI_VAR_SPECIAL;
+    var->from = NULL;
+    var->from_ctx = NULL;
+    return ui_textarea_var(obj, var);
+}
+
+UIWIDGET ui_textarea_nv(UiObject *obj, char *varname) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_TEXT);
+    if(var) {
+        return ui_textarea_var(obj, var);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+char* ui_textarea_get(UiText *text) {
+    if(text->value.ptr) {
+        text->value.free(text->value.ptr);
+    }
+    GtkTextBuffer *buf = text->obj;
+    GtkTextIter start;
+    GtkTextIter end;
+    gtk_text_buffer_get_bounds(buf, &start, &end);
+    char *str = gtk_text_buffer_get_text(buf, &start, &end, FALSE);
+    text->value.ptr = g_strdup(str);
+    text->value.free = (ui_freefunc)g_free;
+    return str;
+}
+
+void ui_textarea_set(UiText *text, char *str) {
+    gtk_text_buffer_set_text((GtkTextBuffer*)text->obj, str, -1);
+    if(text->value.ptr) {
+        text->value.free(text->value.ptr);
+    }
+    text->value.ptr = NULL;
+    text->value.free = NULL;
+}
+
+char* ui_textarea_getsubstr(UiText *text, int begin, int end) {
+    if(text->value.ptr) {
+        text->value.free(text->value.ptr);
+    }
+    GtkTextBuffer *buf = text->obj;
+    GtkTextIter ib;
+    GtkTextIter ie;
+    gtk_text_buffer_get_iter_at_offset(text->obj, &ib, begin);
+    gtk_text_buffer_get_iter_at_offset(text->obj, &ie, end);
+    char *str = gtk_text_buffer_get_text(buf, &ib, &ie, FALSE);
+    text->value.ptr = g_strdup(str);
+    text->value.free = (ui_freefunc)g_free;
+    return str;
+}
+
+void ui_textarea_insert(UiText *text, int pos, char *str) {
+    GtkTextIter offset;
+    gtk_text_buffer_get_iter_at_offset(text->obj, &offset, pos);
+    gtk_text_buffer_insert(text->obj, &offset, str, -1);
+    if(text->value.ptr) {
+        text->value.free(text->value.ptr);
+    }
+    text->value.ptr = NULL;
+    text->value.free = NULL;
+}
+
+void ui_textarea_setposition(UiText *text, int pos) {
+    GtkTextIter iter;
+    gtk_text_buffer_get_iter_at_offset(text->obj, &iter, pos);
+    gtk_text_buffer_place_cursor(text->obj, &iter);
+}
+
+int ui_textarea_position(UiText *text) {
+    GtkTextIter begin;
+    GtkTextIter end;
+    gtk_text_buffer_get_selection_bounds(text->obj, &begin, &end);
+    text->pos = gtk_text_iter_get_offset(&begin);
+    return text->pos;
+}
+
+void ui_textarea_selection(UiText *text, int *begin, int *end) {
+    GtkTextIter b;
+    GtkTextIter e;
+    gtk_text_buffer_get_selection_bounds(text->obj, &b, &e);
+    *begin = gtk_text_iter_get_offset(&b);
+    *end = gtk_text_iter_get_offset(&e);
+}
+
+int ui_textarea_length(UiText *text) {
+    GtkTextBuffer *buf = text->obj;
+    GtkTextIter start;
+    GtkTextIter end;
+    gtk_text_buffer_get_bounds(buf, &start, &end);
+    return gtk_text_iter_get_offset(&end);
+}
+
+void ui_textarea_remove(UiText *text, int begin, int end) {
+    GtkTextBuffer *buf = text->obj;
+    GtkTextIter ib;
+    GtkTextIter ie;
+    gtk_text_buffer_get_iter_at_offset(buf, &ib, begin);
+    gtk_text_buffer_get_iter_at_offset(buf, &ie, end);
+    gtk_text_buffer_delete(buf, &ib, &ie);
+}
+
+void ui_textarea_realize_event(GtkWidget *widget, gpointer data) {
+    gtk_widget_grab_focus(widget);
+}
+
+
+
+void ui_textbuf_changed(GtkTextBuffer *textbuffer, UiTextArea *textarea) {
+    UiText *value = textarea->var->value;
+    if(value->observers) {
+        UiEvent e;
+        e.obj = textarea->ctx->obj;
+        e.window = e.obj->window;
+        e.document = textarea->ctx->document;
+        e.eventdata = value;
+        e.intval = 0;
+        ui_notify_evt(value->observers, &e);
+    }
+}
+
+// undo manager functions
+
+void ui_textbuf_insert(
+        GtkTextBuffer *textbuffer,
+        GtkTextIter *location,
+        char *text,
+        int length,
+        void *data)
+{
+    UiVar *var = data;
+    UiText *value = var->value;
+    if(!value->undomgr) {
+        value->undomgr = ui_create_undomgr();
+    }
+    UiUndoMgr *mgr = value->undomgr;
+    if(!mgr->event) {
+        return;
+    }
+    
+    if(mgr->cur) {
+        UcxList *elm = mgr->cur->next;
+        if(elm) {
+            mgr->cur->next = NULL;
+            while(elm) {
+                elm->prev = NULL;   
+                UcxList *next = elm->next;
+                ui_free_textbuf_op(elm->data);
+                free(elm);
+                elm = next;
+            }
+        }
+        
+        UiTextBufOp *last_op = mgr->cur->data;
+        if(
+            last_op->type == UI_TEXTBUF_INSERT &&
+            ui_check_insertstr(last_op->text, last_op->len, text, length) == 0)
+        {
+            // append text to last op       
+            int ln = last_op->len;
+            char *newtext = malloc(ln + length + 1);
+            memcpy(newtext, last_op->text, ln);
+            memcpy(newtext+ln, text, length);
+            newtext[ln+length] = '\0';
+            
+            last_op->text = newtext;
+            last_op->len = ln + length;
+            last_op->end += length;
+            
+            return;
+        }
+    }
+    
+    char *dpstr = malloc(length + 1);
+    memcpy(dpstr, text, length);
+    dpstr[length] = 0;
+    
+    UiTextBufOp *op = malloc(sizeof(UiTextBufOp));
+    op->type = UI_TEXTBUF_INSERT;
+    op->start = gtk_text_iter_get_offset(location);
+    op->end = op->start+length;
+    op->len = length;
+    op->text = dpstr;
+    
+    UcxList *elm = ucx_list_append(NULL, op);
+    mgr->cur = elm;
+    mgr->begin = ucx_list_concat(mgr->begin, elm);
+}
+
+void ui_textbuf_delete(
+        GtkTextBuffer *textbuffer,
+        GtkTextIter *start,
+        GtkTextIter *end,
+        void *data)
+{
+    UiVar *var = data;
+    UiText *value = var->value;
+    if(!value->undomgr) {
+        value->undomgr = ui_create_undomgr();
+    }
+    UiUndoMgr *mgr = value->undomgr;
+    if(!mgr->event) {
+        return;
+    }
+    
+    if(mgr->cur) {
+        UcxList *elm = mgr->cur->next;
+        if(elm) {
+            mgr->cur->next = NULL;
+            while(elm) {
+                elm->prev = NULL;   
+                UcxList *next = elm->next;
+                ui_free_textbuf_op(elm->data);
+                free(elm);
+                elm = next;
+            }
+        }
+    }
+    
+    char *text = gtk_text_buffer_get_text(value->obj, start, end, FALSE);
+    
+    UiTextBufOp *op = malloc(sizeof(UiTextBufOp));
+    op->type = UI_TEXTBUF_DELETE;
+    op->start = gtk_text_iter_get_offset(start);
+    op->end = gtk_text_iter_get_offset(end);
+    op->len = op->end - op->start;
+    
+    char *dpstr = malloc(op->len + 1);
+    memcpy(dpstr, text, op->len);
+    dpstr[op->len] = 0;
+    op->text = dpstr;
+    
+    UcxList *elm = ucx_list_append(NULL, op);
+    mgr->cur = elm;
+    mgr->begin = ucx_list_concat(mgr->begin, elm);
+}
+
+UiUndoMgr* ui_create_undomgr() {
+    UiUndoMgr *mgr = malloc(sizeof(UiUndoMgr));
+    mgr->begin = NULL;
+    mgr->cur = NULL;
+    mgr->length = 0;
+    mgr->event = 1;
+    return mgr;
+}
+
+void ui_free_textbuf_op(UiTextBufOp *op) {
+    if(op->text) {
+        free(op->text);
+    }
+    free(op);
+}
+
+int ui_check_insertstr(char *oldstr, int oldlen, char *newstr, int newlen) {
+    // return 1 if oldstr + newstr are one word
+    
+    int has_space = 0;
+    for(int i=0;i<oldlen;i++) {
+        if(oldstr[i] < 33) {
+            has_space = 1;
+            break;
+        }
+    }
+    
+    for(int i=0;i<newlen;i++) {
+        if(has_space && newstr[i] > 32) {
+            return 1;
+        }
+    }
+    
+    return 0;
+}
+
+void ui_text_undo(UiText *value) {
+    UiUndoMgr *mgr = value->undomgr;
+    
+    if(mgr->cur) {
+        UiTextBufOp *op = mgr->cur->data;
+        mgr->event = 0;
+        switch(op->type) {
+            case UI_TEXTBUF_INSERT: {
+                GtkTextIter begin;
+                GtkTextIter end;
+                gtk_text_buffer_get_iter_at_offset(value->obj, &begin, op->start);
+                gtk_text_buffer_get_iter_at_offset(value->obj, &end, op->end);
+                gtk_text_buffer_delete(value->obj, &begin, &end);
+                break;
+            }
+            case UI_TEXTBUF_DELETE: {
+                GtkTextIter begin;
+                GtkTextIter end;
+                gtk_text_buffer_get_iter_at_offset(value->obj, &begin, op->start);
+                gtk_text_buffer_get_iter_at_offset(value->obj, &end, op->end);
+                gtk_text_buffer_insert(value->obj, &begin, op->text, op->len);
+                break;
+            }
+        }
+        mgr->event = 1;
+        mgr->cur = mgr->cur->prev;
+    }
+}
+
+void ui_text_redo(UiText *value) {
+    UiUndoMgr *mgr = value->undomgr;
+    
+    UcxList *elm = NULL;
+    if(mgr->cur) {
+        if(mgr->cur->next) {
+            elm = mgr->cur->next;
+        }
+    } else if(mgr->begin) {
+        elm = mgr->begin;
+    }
+    
+    if(elm) {
+        UiTextBufOp *op = elm->data;
+        mgr->event = 0;
+        switch(op->type) {
+            case UI_TEXTBUF_INSERT: {
+                GtkTextIter begin;
+                GtkTextIter end;
+                gtk_text_buffer_get_iter_at_offset(value->obj, &begin, op->start);
+                gtk_text_buffer_get_iter_at_offset(value->obj, &end, op->end);
+                gtk_text_buffer_insert(value->obj, &begin, op->text, op->len);
+                break;
+            }
+            case UI_TEXTBUF_DELETE: {
+                GtkTextIter begin;
+                GtkTextIter end;
+                gtk_text_buffer_get_iter_at_offset(value->obj, &begin, op->start);
+                gtk_text_buffer_get_iter_at_offset(value->obj, &end, op->end);
+                gtk_text_buffer_delete(value->obj, &begin, &end);
+                break;
+            }
+        }
+        mgr->event = 1;
+        mgr->cur = elm;
+    }
+}
+
+
+static UIWIDGET create_textfield_var(UiObject *obj, int width, UiBool frameless, UiBool password, UiVar *var) {
+    GtkWidget *textfield = gtk_entry_new();
+    
+    UiTextField *uitext = malloc(sizeof(UiTextField));
+    uitext->ctx = obj->ctx;
+    uitext->var = var;
+    
+    g_signal_connect(
+                textfield,
+                "destroy",
+                G_CALLBACK(ui_textfield_destroy),
+                uitext);
+    
+    if(width > 0) {
+        gtk_entry_set_width_chars(GTK_ENTRY(textfield), width);
+    }
+    if(frameless) {
+        // TODO: gtk2legacy workaroud
+        gtk_entry_set_has_frame(GTK_ENTRY(textfield), FALSE);
+    }
+    if(password) {
+        gtk_entry_set_visibility(GTK_ENTRY(textfield), FALSE);
+    }
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, textfield, FALSE);
+    
+    if(var) {
+        UiString *value = var->value;
+        if(value->value.ptr) {
+            gtk_entry_set_text(GTK_ENTRY(textfield), value->value.ptr);
+            value->value.free(value->value.ptr);
+            value->value.ptr = NULL;
+            value->value.free = NULL;
+        }
+        
+        value->get = ui_textfield_get;
+        value->set = ui_textfield_set;
+        value->value.ptr = NULL;
+        value->value.free = NULL;
+        value->obj = GTK_ENTRY(textfield);
+        
+        g_signal_connect(
+                textfield,
+                "changed",
+                G_CALLBACK(ui_textfield_changed),
+                uitext);
+    }
+    
+    return textfield;
+}
+
+static UIWIDGET create_textfield_nv(UiObject *obj, int width, UiBool frameless, UiBool password, char *varname) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_STRING);
+    if(var) {
+        return create_textfield_var(obj, width, frameless, password, var);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+static UIWIDGET create_textfield(UiObject *obj, int width, UiBool frameless, UiBool password, UiString *value) {
+    UiVar *var = NULL;
+    if(value) {
+        var = malloc(sizeof(UiVar));
+        var->value = value;
+        var->type = UI_VAR_SPECIAL;
+    }
+    return create_textfield_var(obj, width, frameless, password, var);
+}
+
+void ui_textfield_destroy(GtkWidget *object, UiTextField *textfield) {
+    if(textfield->var) {
+        ui_destroy_boundvar(textfield->ctx, textfield->var);
+    }
+    free(textfield);
+}
+
+void ui_textfield_changed(GtkEditable *editable, UiTextField *textfield) {
+    UiString *value = textfield->var->value;
+    if(value->observers) {
+        UiEvent e;
+        e.obj = textfield->ctx->obj;
+        e.window = e.obj->window;
+        e.document = textfield->ctx->document;
+        e.eventdata = value;
+        e.intval = 0;
+        ui_notify_evt(value->observers, &e);
+    }
+}
+
+UIWIDGET ui_textfield(UiObject *obj, UiString *value) {
+    return create_textfield(obj, 0, FALSE, FALSE, value);
+}
+
+UIWIDGET ui_textfield_nv(UiObject *obj, char *varname) {
+    return create_textfield_nv(obj, 0, FALSE, FALSE, varname);
+}
+
+UIWIDGET ui_textfield_w(UiObject *obj, int width, UiString *value) {
+    return create_textfield(obj, width, FALSE, FALSE, value);
+}
+
+UIWIDGET ui_textfield_wnv(UiObject *obj, int width, char *varname) {
+    return create_textfield_nv(obj, width, FALSE, FALSE, varname);
+}
+
+UIWIDGET ui_frameless_textfield(UiObject *obj, UiString *value) {
+    return create_textfield(obj, 0, TRUE, FALSE, value);
+}
+
+UIWIDGET ui_frameless_textfield_nv(UiObject *obj, char *varname) {
+    return create_textfield_nv(obj, 0, TRUE, FALSE, varname);
+}
+
+UIWIDGET ui_passwordfield(UiObject *obj, UiString *value) {
+    return create_textfield(obj, 0, FALSE, TRUE, value);
+}
+
+UIWIDGET ui_passwordfield_nv(UiObject *obj, char *varname) {
+    return create_textfield_nv(obj, 0, FALSE, TRUE, varname);
+}
+
+UIWIDGET ui_passwordfield_w(UiObject *obj, int width, UiString *value) {
+    return create_textfield(obj, width, FALSE, TRUE, value);
+}
+
+UIWIDGET ui_passwordfield_wnv(UiObject *obj, int width, char *varname) {
+    return create_textfield_nv(obj, width, FALSE, TRUE, varname);
+}
+
+char* ui_textfield_get(UiString *str) {
+    if(str->value.ptr) {
+        str->value.free(str->value.ptr);
+    }
+    str->value.ptr = g_strdup(gtk_entry_get_text(str->obj));
+    str->value.free = (ui_freefunc)g_free;
+    return str->value.ptr;
+}
+
+void ui_textfield_set(UiString *str, char *value) {
+    gtk_entry_set_text(str->obj, value);
+    if(str->value.ptr) {
+        str->value.free(str->value.ptr);
+        str->value.ptr = NULL;
+        str->value.free = NULL;
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/text.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,112 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TEXT_H
+#define	TEXT_H
+
+#include "../ui/text.h"
+#include "toolkit.h"
+#include <ucx/list.h>
+#include "../common/context.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#define UI_TEXTBUF_INSERT 0
+#define UI_TEXTBUF_DELETE 1
+typedef struct UiTextBufOp {
+    int  type; // UI_TEXTBUF_INSERT, UI_TEXTBUF_DELETE
+    int  start;
+    int  end;
+    int  len;
+    char *text;
+} UiTextBufOp;
+
+typedef struct UiUndoMgr {
+    UcxList *begin;
+    UcxList *cur;
+    int     length;
+    int     event;
+} UiUndoMgr;
+
+typedef struct UiTextArea {
+    UiContext *ctx;
+    UiVar    *var;
+    int       last_selection_state;
+} UiTextArea;
+
+typedef struct UiTextField {
+    UiContext *ctx;
+    UiVar    *var;
+    // TODO: validatefunc
+} UiTextField;
+
+UIWIDGET ui_textarea_var(UiObject *obj, UiVar *var);
+void ui_textarea_destroy(GtkWidget *object, UiTextArea *textarea);
+
+char* ui_textarea_get(UiText *text);
+void ui_textarea_set(UiText *text, char *str);
+char* ui_textarea_getsubstr(UiText *text, int begin, int end);
+void ui_textarea_insert(UiText *text, int pos, char *str);
+void ui_textarea_setposition(UiText *text, int pos);
+int ui_textarea_position(UiText *text);
+void ui_textarea_selection(UiText *text, int *begin, int *end);
+int ui_textarea_length(UiText *text);
+void ui_textarea_remove(UiText *text, int begin, int end);
+
+void ui_textarea_realize_event(GtkWidget *widget, gpointer data);
+void ui_textbuf_changed(GtkTextBuffer *textbuffer, UiTextArea *textarea);
+
+void ui_textbuf_insert(
+        GtkTextBuffer *textbuffer,
+        GtkTextIter *location,
+        char *text,
+        int len,
+        void *data);
+void ui_textbuf_delete(
+        GtkTextBuffer *textbuffer,
+        GtkTextIter *start,
+        GtkTextIter *end,
+        void *data);
+UiUndoMgr* ui_create_undomgr();
+void ui_free_textbuf_op(UiTextBufOp *op);
+int ui_check_insertstr(char *oldstr, int oldlen, char *newstr, int newlen);
+
+void ui_textfield_destroy(GtkWidget *object, UiTextField *textfield);
+void ui_textfield_changed(GtkEditable *editable, UiTextField *textfield);
+
+char* ui_textfield_get(UiString *str);
+void ui_textfield_set(UiString *str, char *value);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* TEXT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/toolbar.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,386 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "toolbar.h"
+#include "button.h"
+#include "image.h"
+#include "tree.h"
+#include <ucx/mempool.h>
+#include "../common/context.h"
+
+static UcxMap *toolbar_items;
+static UcxList *defaults;
+
+void ui_toolbar_init() {
+    toolbar_items = ucx_map_new(16);
+}
+
+void ui_toolitem(char *name, char *label, ui_callback f, void *udata) {
+    ui_toolitem_img(name, label, NULL, f, udata);
+}
+
+void ui_toolitem_st(char *name, char *stockid, ui_callback f, void *userdata) {
+    ui_toolitem_stgr(name, stockid, f, userdata, -1);
+}
+
+void ui_toolitem_sti(char *name, char *stockid, ui_callback f, void *userdata) {
+    ui_toolitem_stgri(name, stockid, f, userdata, -1);
+}
+
+void ui_toolitem_stgr(char *name, char *stockid, ui_callback f, void *userdata, ...) {
+    va_list ap;
+    va_start(ap, userdata);
+    ui_toolitem_vstgr(name, stockid, 0, f, userdata, ap);
+    va_end(ap);
+}
+
+void ui_toolitem_stgri(char *name, char *stockid, ui_callback f, void *userdata, ...) {
+    va_list ap;
+    va_start(ap, userdata);
+    ui_toolitem_vstgr(name, stockid, 1, f, userdata, ap);
+    va_end(ap);
+}
+
+void ui_toolitem_img(char *name, char *label, char *img, ui_callback f, void *udata) {
+    UiToolItem *item = malloc(sizeof(UiToolItem));
+    item->item.add_to = (ui_toolbar_add_f)add_toolitem_widget;
+    item->label = label;
+    item->image = img;
+    item->callback = f;
+    item->userdata = udata;
+    item->isimportant = 0;
+    item->groups = NULL;
+    
+    ucx_map_cstr_put(toolbar_items, name, item);
+}
+
+void ui_toolitem_vstgr(
+        char *name,
+        char *stockid,
+        int isimportant,
+        ui_callback f,
+        void *userdata,
+        va_list ap)
+{
+    UiStToolItem *item = malloc(sizeof(UiStToolItem));
+    item->item.add_to = (ui_toolbar_add_f)add_toolitem_st_widget;
+    item->stockid = stockid;
+    item->callback = f;
+    item->userdata = userdata;
+    item->groups = NULL;
+    item->isimportant = isimportant;
+    
+    // add groups
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->groups = ucx_list_append(item->groups, (void*)(intptr_t)group);
+    }
+    
+    ucx_map_cstr_put(toolbar_items, name, item);
+}
+
+void ui_toolitem_toggle_st(char *name, char *stockid, ui_callback f, void *udata) {
+    ui_toolitem_toggle_stgr(name, stockid, f, udata, -1);
+}
+
+void ui_toolitem_toggle_stgr(char *name, char *stockid, ui_callback f, void *udata, ...) {
+    UiStToolItem *item = malloc(sizeof(UiStToolItem));
+    item->item.add_to = (ui_toolbar_add_f)add_toolitem_toggle_st_widget;
+    item->stockid = stockid;
+    item->callback = f;
+    item->userdata = udata;
+    item->groups = NULL;
+    item->isimportant = 0;
+    
+    // add groups
+    va_list ap;
+    va_start(ap, udata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->groups = ucx_list_append(item->groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    ucx_map_cstr_put(toolbar_items, name, item);
+}
+
+void ui_toolitem_toggle_imggr(char *name, char *label, char *img, ui_callback f, void *udata, ...) {
+    UiToolItem *item = malloc(sizeof(UiToolItem));
+    item->item.add_to = (ui_toolbar_add_f)add_toolitem_toggle_widget;
+    item->label = label;
+    item->image = img;
+    item->callback = f;
+    item->userdata = udata;
+    item->groups = NULL;
+    item->isimportant = 0;
+    
+    // add groups
+    va_list ap;
+    va_start(ap, udata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->groups = ucx_list_append(item->groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    ucx_map_cstr_put(toolbar_items, name, item);
+}
+
+
+void ui_toolbar_combobox(
+        char *name,
+        UiList *list,
+        ui_getvaluefunc getvalue,
+        ui_callback f,
+        void *udata)
+{
+    UiToolbarComboBox *cb = malloc(sizeof(UiToolbarComboBox));
+    cb->item.add_to = (ui_toolbar_add_f)add_toolbar_combobox;
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = list;
+    var->type = UI_VAR_SPECIAL;
+    var->from = NULL;
+    var->from_ctx = NULL;
+    cb->var = var;
+    cb->getvalue = getvalue;
+    cb->callback = f;
+    cb->userdata = udata;
+    
+    ucx_map_cstr_put(toolbar_items, name, cb);
+}
+
+void ui_toolbar_combobox_str(
+        char *name,
+        UiList *list,
+        ui_callback f,
+        void *udata)
+{
+    ui_toolbar_combobox(name, list, ui_strmodel_getvalue, f, udata);
+}
+
+void ui_toolbar_combobox_nv(
+        char *name,
+        char *listname,
+        ui_getvaluefunc getvalue,
+        ui_callback f,
+        void *udata)
+{
+    UiToolbarComboBoxNV *cb = malloc(sizeof(UiToolbarComboBoxNV));
+    cb->item.add_to = (ui_toolbar_add_f)add_toolbar_combobox_nv;  
+    cb->listname = listname;
+    cb->getvalue = getvalue;
+    cb->callback = f;
+    cb->userdata = udata;
+    
+    ucx_map_cstr_put(toolbar_items, name, cb);
+}
+
+
+void ui_toolbar_add_default(char *name) {
+    char *s = strdup(name);
+    defaults = ucx_list_append(defaults, s);
+}
+
+GtkWidget* ui_create_toolbar(UiObject *obj) {
+    if(!defaults) {
+        return NULL;
+    }
+    
+    GtkWidget *toolbar = gtk_toolbar_new();
+#ifdef UI_GTK3
+    gtk_style_context_add_class(
+            gtk_widget_get_style_context(toolbar),
+            GTK_STYLE_CLASS_PRIMARY_TOOLBAR);
+#endif
+    
+    GtkToolbar *tb = GTK_TOOLBAR(toolbar);
+    UCX_FOREACH(elm, defaults) {
+        UiToolItemI *item = ucx_map_cstr_get(toolbar_items, elm->data);
+        if(item) {
+            item->add_to(tb, item, obj);
+        } else if(!strcmp(elm->data, "@separator")) {
+            gtk_toolbar_insert(tb, gtk_separator_tool_item_new(), -1);
+        } else {
+            fprintf(stderr, "UI Error: Unknown toolbar item: %s\n", elm->data);
+        }
+    }
+    
+    return toolbar;
+}
+
+void add_toolitem_widget(GtkToolbar *tb, UiToolItem *item, UiObject *obj) {
+    GtkToolItem *button = gtk_tool_button_new(NULL, item->label);
+    gtk_tool_item_set_homogeneous(button, FALSE);
+    if(item->image) {
+        GdkPixbuf *pixbuf = ui_get_image(item->image);
+        GtkWidget *image = gtk_image_new_from_pixbuf(pixbuf);
+        gtk_tool_button_set_icon_widget(GTK_TOOL_BUTTON(button), image);
+    } else {
+        gtk_tool_item_set_is_important(button, TRUE);
+    }
+    
+    if(item->callback) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = item->userdata;
+        event->callback = item->callback;
+        
+        g_signal_connect(
+                button,
+                "clicked",
+                G_CALLBACK(ui_button_clicked),
+                event);
+    }
+    
+    gtk_toolbar_insert(tb, button, -1);
+    
+    if(item->groups) {
+        uic_add_group_widget(obj->ctx, button, item->groups);
+    }
+}
+
+void add_toolitem_st_widget(GtkToolbar *tb, UiStToolItem *item, UiObject *obj) {
+    GtkToolItem *button = gtk_tool_button_new_from_stock(item->stockid);
+    gtk_tool_item_set_homogeneous(button, FALSE);
+    if(item->isimportant) {
+        gtk_tool_item_set_is_important(button, TRUE);
+    }
+    
+    if(item->callback) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = item->userdata;
+        event->callback = item->callback;
+        
+        g_signal_connect(
+                button,
+                "clicked",
+                G_CALLBACK(ui_button_clicked),
+                event);
+    }
+    
+    gtk_toolbar_insert(tb, button, -1);
+    
+    if(item->groups) {
+        uic_add_group_widget(obj->ctx, button, item->groups);
+    }
+}
+
+void add_toolitem_toggle_widget(GtkToolbar *tb, UiToolItem *item, UiObject *obj) {
+    GtkToolItem *button = gtk_toggle_tool_button_new();
+    gtk_tool_item_set_homogeneous(button, FALSE);
+    if(item->label) {
+        gtk_tool_button_set_label(GTK_TOOL_BUTTON(button), item->label);
+    }
+    if(item->image) {
+        GdkPixbuf *pixbuf = ui_get_image(item->image);
+        GtkWidget *image = gtk_image_new_from_pixbuf(pixbuf);
+        gtk_tool_button_set_icon_widget(GTK_TOOL_BUTTON(button), image);
+    }    
+    
+    if(item->callback) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = item->userdata;
+        event->callback = item->callback;
+        
+        g_signal_connect(
+                button,
+                "toggled",
+                G_CALLBACK(ui_button_toggled),
+                event);
+    }
+    
+    gtk_toolbar_insert(tb, button, -1);
+    
+    if(item->groups) {
+        uic_add_group_widget(obj->ctx, button, item->groups);
+    }
+}
+
+void add_toolitem_toggle_st_widget(GtkToolbar *tb, UiStToolItem *item, UiObject *obj) {
+    GtkToolItem *button = gtk_toggle_tool_button_new_from_stock(item->stockid);
+    gtk_tool_item_set_homogeneous(button, FALSE);
+    
+    if(item->callback) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = item->userdata;
+        event->callback = item->callback;
+        
+        g_signal_connect(
+                button,
+                "toggled",
+                G_CALLBACK(ui_button_toggled),
+                event);
+    }
+    
+    gtk_toolbar_insert(tb, button, -1);
+    
+    if(item->groups) {
+        uic_add_group_widget(obj->ctx, button, item->groups);
+    }
+}
+
+void add_toolbar_combobox(GtkToolbar *tb, UiToolbarComboBox *cb, UiObject *obj) {
+    UiModel *modelinfo = ui_model(obj->ctx, UI_STRING, "", -1);
+    modelinfo->getvalue = cb->getvalue;
+    UiListModel *model = ui_list_model_new(obj, cb->var, modelinfo);
+    
+    GtkWidget *combobox = ui_create_combobox(obj, model, cb->callback, cb->userdata);
+    GtkToolItem *item = gtk_tool_item_new();
+    gtk_container_add(GTK_CONTAINER(item), combobox);
+    gtk_toolbar_insert(tb, item, -1);
+}
+
+void add_toolbar_combobox_nv(GtkToolbar *tb, UiToolbarComboBoxNV *cb, UiObject *obj) {
+    UiVar *var = uic_create_var(obj->ctx, cb->listname, UI_VAR_LIST);
+    if(var) {
+        UiModel *modelinfo = ui_model(obj->ctx, UI_STRING, "", -1);
+        modelinfo->getvalue = cb->getvalue;
+        UiListModel *model = ui_list_model_new(obj, var, modelinfo);
+        
+        GtkWidget *combobox = ui_create_combobox(obj, model, cb->callback, cb->userdata);
+        GtkToolItem *item = gtk_tool_item_new();
+        gtk_container_add(GTK_CONTAINER(item), combobox);
+        gtk_toolbar_insert(tb, item, -1);
+    }
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/toolbar.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,118 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TOOLBAR_H
+#define	TOOLBAR_H
+
+#include "../ui/toolbar.h"
+#include <ucx/map.h>
+#include <ucx/list.h>
+
+#include "model.h"
+#include "tree.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiToolItemI    UiToolItemI;
+typedef struct UiToolItem     UiToolItem;
+typedef struct UiStToolItem   UiStToolItem;
+
+typedef struct UiToolbarComboBox   UiToolbarComboBox;
+typedef struct UiToolbarComboBoxNV UiToolbarComboBoxNV;
+
+typedef void(*ui_toolbar_add_f)(GtkToolbar*, UiToolItemI*, UiObject*);
+
+struct UiToolItemI {
+    ui_toolbar_add_f  add_to;
+};
+
+struct UiToolItem {
+    UiToolItemI    item;
+    char           *label;
+    char           *image;
+    ui_callback    callback;
+    void           *userdata;
+    UcxList        *groups;
+    int            isimportant;
+};
+
+struct UiStToolItem {
+    UiToolItemI    item;
+    char           *stockid;
+    ui_callback    callback;
+    void           *userdata;
+    UcxList        *groups;
+    int            isimportant;
+};
+
+struct UiToolbarComboBox {
+    UiToolItemI         item;
+    UiVar               *var;
+    ui_getvaluefunc getvalue;
+    ui_callback         callback;
+    void                *userdata;
+};
+
+struct UiToolbarComboBoxNV {
+    UiToolItemI         item;
+    char                *listname;
+    ui_getvaluefunc getvalue;
+    ui_callback         callback;
+    void                *userdata;
+};
+
+void ui_toolbar_init();
+
+void ui_toolitem_vstgr(
+        char *name,
+        char *stockid,
+        int isimportant,
+        ui_callback f,
+        void *userdata,
+        va_list ap);
+
+GtkWidget* ui_create_toolbar(UiObject *obj);
+
+void add_toolitem_widget(GtkToolbar *tb, UiToolItem *item, UiObject *obj);
+void add_toolitem_st_widget(GtkToolbar *tb, UiStToolItem *item, UiObject *obj);
+void add_toolitem_toggle_widget(GtkToolbar *tb, UiToolItem *item, UiObject *obj);
+void add_toolitem_toggle_st_widget(GtkToolbar *tb, UiStToolItem *item, UiObject *obj);
+
+void add_toolbar_combobox(GtkToolbar *tb, UiToolbarComboBox *cb, UiObject *obj);
+void add_toolbar_combobox_nv(GtkToolbar *tb, UiToolbarComboBoxNV *cb, UiObject *obj);
+void ui_combobox_change_event(GtkComboBox *widget, UiEventData *e);
+void ui_combobox_update(UiEvent *event, void *combobox);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* TOOLBAR_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/toolkit.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,262 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "toolkit.h"
+#include "toolbar.h"
+#include "model.h"
+#include "image.h"
+#include "../common/document.h"
+#include "../common/properties.h"
+
+#include <ucx/utils.h>
+
+#include <pthread.h>
+
+#ifndef UI_GTK2
+static GtkApplication *app;
+#endif
+
+static char *application_name;
+
+static ui_callback   startup_func;
+static void          *startup_data;
+static ui_callback   open_func;
+void                 *open_data;
+static ui_callback   exit_func;
+void                 *exit_data;
+
+static ui_callback   appclose_fnc;
+static void          *appclose_udata;
+
+static UiObject      *active_window;
+
+static int scale_factor = 1;
+
+void ui_init(char *appname, int argc, char **argv) {
+    gtk_init(&argc, &argv);
+    application_name = appname;
+    
+    uic_docmgr_init();
+    ui_toolbar_init();
+    
+    // init custom types
+    ui_list_init();
+    
+    ui_image_init();
+    
+    uic_load_app_properties();
+    
+#ifdef UI_SUPPORTS_SCALE
+    scale_factor = gdk_monitor_get_scale_factor(
+            gdk_display_get_primary_monitor(gdk_display_get_default()));
+#endif
+}
+
+char* ui_appname() {
+    return application_name;
+}
+
+void ui_onstartup(ui_callback f, void *userdata) {
+    startup_func = f;
+    startup_data = userdata;
+}
+
+void ui_onopen(ui_callback f, void *userdata) {
+    open_func = f;
+    open_data = userdata;
+}
+
+void ui_onexit(ui_callback f, void *userdata) {
+    exit_func = f;
+    exit_data = userdata;
+}
+
+
+#ifndef UI_GTK2
+static void app_startup(GtkApplication* app, gpointer userdata) {
+    if(startup_func) {
+        startup_func(NULL, startup_data);
+    }
+}
+
+static void app_activate(GtkApplication* app, gpointer userdata) {
+    printf("activate\n");
+}
+#endif
+
+void ui_main() {
+#ifndef UI_GTK2
+    sstr_t appid = ucx_sprintf(
+            "ui.%s",
+            application_name ? application_name : "application1");
+    
+    app = gtk_application_new(
+            appid.ptr,
+            G_APPLICATION_FLAGS_NONE);
+    g_signal_connect (app, "startup", G_CALLBACK (app_startup), NULL);
+    g_signal_connect (app, "activate", G_CALLBACK (app_activate), NULL);
+    g_application_run(G_APPLICATION (app), 0, NULL);
+    g_object_unref (app);
+    
+    free(appid.ptr);
+#else
+    if(startup_func) {
+        startup_func(NULL, startup_data);
+    }
+    gtk_main();
+#endif
+    if(exit_func) {
+        exit_func(NULL, exit_data);
+    }
+    uic_store_app_properties();
+}
+
+#ifndef UI_GTK2
+void ui_app_quit() {
+    g_application_quit(G_APPLICATION(app));
+}
+
+GtkApplication* ui_get_application() {
+    return app;
+}
+#endif
+
+void ui_show(UiObject *obj) {
+    uic_check_group_widgets(obj->ctx);
+    gtk_widget_show_all(obj->widget);
+}
+
+void ui_close(UiObject *obj) {
+    gtk_widget_destroy(obj->widget);
+}
+
+
+static gboolean ui_job_finished(void *data) {
+    UiJob *job = data;
+    
+    UiEvent event;
+    event.obj = job->obj;
+    event.window = job->obj->window;
+    event.document = job->obj->ctx->document;
+    event.intval = 0;
+    event.eventdata = NULL;
+
+    job->finish_callback(&event, job->finish_data);
+    free(job);
+    return FALSE;
+}
+
+static void* ui_jobthread(void *data) {
+    UiJob *job = data;
+    int result = job->job_func(job->job_data);
+    if(!result) {
+        g_idle_add(ui_job_finished, job);
+    }
+    return NULL;
+}
+
+void ui_job(UiObject *obj, ui_threadfunc tf, void *td, ui_callback f, void *fd) {
+    UiJob *job = malloc(sizeof(UiJob));
+    job->obj = obj;
+    job->job_func = tf;
+    job->job_data = td;
+    job->finish_callback = f;
+    job->finish_data = fd;
+    pthread_t pid;
+    pthread_create(&pid, NULL, ui_jobthread, job);
+}
+
+void ui_set_enabled(UIWIDGET widget, int enabled) {
+    gtk_widget_set_sensitive(widget, enabled);
+}
+
+void ui_set_show_all(UIWIDGET widget, int value) {
+    gtk_widget_set_no_show_all(widget, !value);
+}
+
+void ui_set_visible(UIWIDGET widget, int visible) {
+    if(visible) {
+        gtk_widget_set_no_show_all(widget, FALSE);
+        gtk_widget_show_all(widget);
+    } else {
+        gtk_widget_hide(widget);
+    }
+}
+
+void ui_clipboard_set(char *str) {
+    GtkClipboard *cb = gtk_clipboard_get(GDK_SELECTION_CLIPBOARD);
+    gtk_clipboard_set_text(cb, str, strlen(str));
+}
+
+char* ui_clipboard_get() {
+    GtkClipboard *cb = gtk_clipboard_get(GDK_SELECTION_CLIPBOARD);
+    char *str = gtk_clipboard_wait_for_text(cb);
+    if(str) {
+        char *copy = strdup(str);
+        g_free(str);
+        return copy;
+    } else {
+        return NULL;
+    }
+}
+
+int ui_get_scalefactor() {
+    return scale_factor;
+}
+
+void ui_destroy_userdata(GtkWidget *object, void *userdata) {
+    free(userdata);
+}
+
+void ui_destroy_vardata(GtkWidget *object, UiVarEventData *data) {
+    ui_destroy_boundvar(data->obj->ctx, data->var);
+    free(data);
+}
+
+void ui_destroy_boundvar(UiContext *ctx, UiVar *var) {
+    if(var->type == UI_VAR_SPECIAL) {
+        free(var);
+    } else {
+        uic_remove_bound_var(ctx, var);
+    }
+}
+
+void ui_set_active_window(UiObject *obj) {
+    active_window = obj;
+}
+
+UiObject *ui_get_active_window() {
+    return active_window;
+}
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/toolkit.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,90 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TOOLKIT_H
+#define	TOOLKIT_H
+
+#include "../ui/toolkit.h"
+#include "../common/context.h"
+#include "../common/object.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+    
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+
+typedef struct UiEventData {
+    UiObject    *obj;
+    ui_callback callback;
+    void        *userdata;
+    int         value;
+} UiEventData;
+
+typedef struct UiVarEventData {
+    UiObject   *obj;
+    UiVar     *var;
+    UiObserver **observers;
+} UiVarEventData;
+
+
+typedef struct UiJob {
+    UiObject      *obj;
+    ui_threadfunc job_func;
+    void          *job_data;
+    ui_callback   finish_callback;
+    void          *finish_data;
+} UiJob;
+
+struct UiSelection {
+    GtkSelectionData *data;
+};
+
+typedef enum UiOrientation UiOrientation;
+enum UiOrientation { UI_HORIZONTAL = 0, UI_VERTICAL };
+
+#ifndef UI_GTK2
+void ui_app_quit();
+GtkApplication* ui_get_application();
+#endif
+
+int ui_get_scalefactor();
+
+void ui_destroy_userdata(GtkWidget *object, void *userdata);
+void ui_destroy_vardata(GtkWidget *object, UiVarEventData *data);
+void ui_destroy_boundvar(UiContext *ctx, UiVar *var);
+
+void ui_set_active_window(UiObject *obj);
+UiObject *ui_get_active_window();
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* TOOLKIT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/tree.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,562 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+
+#include "../common/context.h"
+#include "../common/object.h"
+#include "container.h"
+
+#include "tree.h"
+
+
+void* ui_strmodel_getvalue(void *elm, int column) {
+    return column == 0 ? elm : NULL;
+}
+
+
+UIWIDGET ui_listview_str(UiObject *obj, UiList *list, ui_callback f, void *udata) {
+    return ui_listview(obj, list, ui_strmodel_getvalue, f, udata);
+}
+
+UIWIDGET ui_listview_var(UiObject *obj, UiVar *var, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
+    // create treeview
+    GtkWidget *view = gtk_tree_view_new();
+    GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
+    GtkTreeViewColumn *column = gtk_tree_view_column_new_with_attributes(NULL, renderer, "text", 0, NULL);
+    gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);
+    
+    gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(view), FALSE);
+#ifdef UI_GTK3
+#if GTK_MINOR_VERSION >= 8
+    gtk_tree_view_set_activate_on_single_click(GTK_TREE_VIEW(view), TRUE);
+#else
+    // TODO: implement for older gtk3
+#endif
+#else
+    // TODO: implement for gtk2
+#endif
+    
+    UiModel *model = ui_model(obj->ctx, UI_STRING, "", -1);
+    model->getvalue = getvalue;
+    UiList *list = var->value;
+    UiListModel *listmodel = ui_list_model_new(obj, var, model);
+    gtk_tree_view_set_model(GTK_TREE_VIEW(view), GTK_TREE_MODEL(listmodel));
+    
+    UiListView *listview = malloc(sizeof(UiListView));
+    listview->obj = obj;
+    listview->widget = view;
+    listview->var = var;
+    listview->model = model;
+    g_signal_connect(
+                view,
+                "destroy",
+                G_CALLBACK(ui_listview_destroy),
+                listview);
+    
+    // bind var
+    list->update = ui_listview_update;
+    list->obj = listview;
+    
+    // add callback
+    if(f) {
+        UiTreeEventData *event = ui_malloc(obj->ctx, sizeof(UiTreeEventData));
+        event->obj = obj;
+        event->userdata = udata;
+        event->activate = f;
+        event->selection = NULL;
+
+        g_signal_connect(
+                view,
+                "row-activated",
+                G_CALLBACK(ui_listview_activate_event),
+                event);
+    }
+    
+    // add widget to the current container
+    GtkWidget *scroll_area = gtk_scrolled_window_new(NULL, NULL);
+    gtk_scrolled_window_set_policy(
+            GTK_SCROLLED_WINDOW(scroll_area),
+            GTK_POLICY_AUTOMATIC,
+            GTK_POLICY_AUTOMATIC); // GTK_POLICY_ALWAYS  
+    gtk_container_add(GTK_CONTAINER(scroll_area), view);
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, scroll_area, TRUE);
+    
+    // ct->current should point to view, not scroll_area, to make it possible
+    // to add a context menu
+    ct->current = view;
+    
+    return scroll_area;
+}
+
+UIWIDGET ui_listview(UiObject *obj, UiList *list, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = list;
+    var->type = UI_VAR_SPECIAL;
+    return ui_listview_var(obj, var, getvalue, f, udata);
+}
+
+UIWIDGET ui_listview_nv(UiObject *obj, char *varname, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_LIST);
+    if(var) {
+        return ui_listview_var(obj, var, getvalue, f, udata);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+static void drag_begin(GtkWidget *widget, GdkDragContext *context, gpointer udata) {
+    printf("drag begin\n");
+    
+}
+
+static void drag_end(
+        GtkWidget *widget,
+        GdkDragContext *context,
+        guint time,
+        gpointer udata)
+{
+    printf("drag end\n");
+    
+}
+
+static GtkTargetEntry targetentries[] =
+    {
+      { "STRING",        0, 0 },
+      { "text/plain",    0, 1 },
+      { "text/uri-list", 0, 2 },
+    };
+
+UIWIDGET ui_table_var(UiObject *obj, UiVar *var, UiModel *model, UiListCallbacks cb) {
+    // create treeview
+    GtkWidget *view = gtk_tree_view_new();
+    
+    int addi = 0;
+    for(int i=0;i<model->columns;i++) {
+        GtkTreeViewColumn *column = NULL;
+        if(model->types[i] == UI_ICON_TEXT) {
+            column = gtk_tree_view_column_new();
+            gtk_tree_view_column_set_title(column, model->titles[i]);
+            
+            GtkCellRenderer *iconrenderer = gtk_cell_renderer_pixbuf_new();
+            GtkCellRenderer *textrenderer = gtk_cell_renderer_text_new();
+            
+            gtk_tree_view_column_pack_end(column, textrenderer, TRUE);
+            gtk_tree_view_column_pack_start(column, iconrenderer, FALSE);
+            
+            
+            gtk_tree_view_column_add_attribute(column, iconrenderer, "pixbuf", i);
+            gtk_tree_view_column_add_attribute(column, textrenderer, "text", i+1);
+            
+            addi++;
+        } else {
+            GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
+            column = gtk_tree_view_column_new_with_attributes(
+                model->titles[i],
+                renderer,
+                "text",
+                i + addi,
+                NULL);
+        }
+        gtk_tree_view_column_set_resizable(column, TRUE);
+        gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);
+    }
+    
+    //gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(view), FALSE);
+#ifdef UI_GTK3
+    //gtk_tree_view_set_activate_on_single_click(GTK_TREE_VIEW(view), TRUE);
+#else
+    
+#endif
+    
+    UiList *list = var->value;
+    UiListModel *listmodel = ui_list_model_new(obj, var, model);
+    gtk_tree_view_set_model(GTK_TREE_VIEW(view), GTK_TREE_MODEL(listmodel));
+    
+    //g_signal_connect(view, "drag-begin", G_CALLBACK(drag_begin), NULL);
+    //g_signal_connect(view, "drag-end", G_CALLBACK(drag_end), NULL);
+       
+    // add TreeView as observer to the UiList to update the TreeView if the
+    // data changes
+    UiListView *tableview = malloc(sizeof(UiListView));
+    tableview->obj = obj;
+    tableview->widget = view;
+    tableview->var = var;
+    tableview->model = model;
+    g_signal_connect(
+                view,
+                "destroy",
+                G_CALLBACK(ui_listview_destroy),
+                tableview);
+    
+    // bind var
+    list->update = ui_listview_update;
+    list->obj = tableview;
+    
+    // add callback
+    UiTreeEventData *event = ui_malloc(obj->ctx, sizeof(UiTreeEventData));
+    event->obj = obj;
+    event->activate = cb.activate;
+    event->selection = cb.selection;
+    event->userdata = cb.userdata;
+    if(cb.activate) {
+        g_signal_connect(
+                view,
+                "row-activated",
+                G_CALLBACK(ui_listview_activate_event),
+                event);
+    }
+    if(cb.selection) {
+        GtkTreeSelection *selection = gtk_tree_view_get_selection(
+                GTK_TREE_VIEW(view));
+        g_signal_connect(
+                selection,
+                "changed",
+                G_CALLBACK(ui_listview_selection_event),
+                event);
+    }
+    // TODO: destroy callback
+
+    
+    GtkTreeSelection *selection = gtk_tree_view_get_selection (GTK_TREE_VIEW(view));
+    gtk_tree_selection_set_mode(selection, GTK_SELECTION_MULTIPLE);
+    
+    // add widget to the current container
+    GtkWidget *scroll_area = gtk_scrolled_window_new(NULL, NULL);
+    gtk_scrolled_window_set_policy(
+            GTK_SCROLLED_WINDOW(scroll_area),
+            GTK_POLICY_AUTOMATIC,
+            GTK_POLICY_AUTOMATIC); // GTK_POLICY_ALWAYS  
+    gtk_container_add(GTK_CONTAINER(scroll_area), view);
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, scroll_area, TRUE);
+    
+    // ct->current should point to view, not scroll_area, to make it possible
+    // to add a context menu
+    ct->current = view;
+    
+    return scroll_area;
+}
+
+UIWIDGET ui_table(UiObject *obj, UiList *list, UiModel *model, UiListCallbacks cb) {
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = list;
+    var->type = UI_VAR_SPECIAL;
+    return ui_table_var(obj, var, model, cb);
+}
+
+UIWIDGET ui_table_nv(UiObject *obj, char *varname, UiModel *model, UiListCallbacks cb) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_LIST);
+    if(var) {
+        return ui_table_var(obj, var, model, cb);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+GtkWidget* ui_get_tree_widget(UIWIDGET widget) {
+    GList *c = gtk_container_get_children(GTK_CONTAINER(widget));
+    if(c) {
+        return c->data;
+    }
+    return NULL;
+}
+
+static char** targets2array(char *target0, va_list ap, int *nelm) {
+    int al = 16;
+    char **targets = calloc(16, sizeof(char*));
+    targets[0] = target0;
+    
+    int i = 1;
+    char *target;
+    while((target = va_arg(ap, char*)) != NULL) {
+        if(i >= al) {
+            al *= 2;
+            targets = realloc(targets, al*sizeof(char*));
+        }
+        targets[i] = target;
+        i++;
+    }
+    
+    *nelm = i;
+    return targets;
+}
+
+static GtkTargetEntry* targetstr2gtktargets(char **str, int nelm) {
+    GtkTargetEntry *targets = calloc(nelm, sizeof(GtkTargetEntry));
+    for(int i=0;i<nelm;i++) {
+        targets[i].target = str[i];
+    }
+    return targets;
+}
+
+void ui_table_dragsource(UIWIDGET tablewidget, int actions, char *target0, ...) { 
+    va_list ap;
+    va_start(ap, target0);
+    int nelm;
+    char **targets = targets2array(target0, ap, &nelm);
+    va_end(ap);
+    ui_table_dragsource_a(tablewidget, actions, targets, nelm);
+    free(targets);
+}
+
+void ui_table_dragsource_a(UIWIDGET tablewidget, int actions, char **targets, int nelm) {
+    GtkTargetEntry* t = targetstr2gtktargets(targets, nelm);
+    gtk_tree_view_enable_model_drag_source(
+            GTK_TREE_VIEW(ui_get_tree_widget(tablewidget)),
+            GDK_BUTTON1_MASK,
+            t,
+            nelm,
+            GDK_ACTION_COPY|GDK_ACTION_MOVE|GDK_ACTION_LINK);
+    free(t);
+}
+
+void ui_table_dragdest(UIWIDGET tablewidget, int actions, char *target0, ...) {
+    va_list ap;
+    va_start(ap, target0);
+    int nelm;
+    char **targets = targets2array(target0, ap, &nelm);
+    va_end(ap);
+    ui_table_dragdest_a(tablewidget, actions, targets, nelm);
+    free(targets);
+}
+
+void ui_table_dragdest_a(UIWIDGET tablewidget, int actions, char **targets, int nelm) {
+    GtkTargetEntry* t = targetstr2gtktargets(targets, nelm);
+    gtk_tree_view_enable_model_drag_dest(
+            GTK_TREE_VIEW(ui_get_tree_widget(tablewidget)),
+            t,
+            nelm,
+            GDK_ACTION_COPY|GDK_ACTION_MOVE|GDK_ACTION_LINK);
+    free(t);
+}
+
+void ui_listview_update(UiList *list, int i) {
+    UiListView *view = list->obj;
+    UiListModel *model = ui_list_model_new(view->obj, view->var, view->model);
+    gtk_tree_view_set_model(GTK_TREE_VIEW(view->widget), GTK_TREE_MODEL(model));
+    g_object_unref(G_OBJECT(model));
+    // TODO: free old model
+}
+
+void ui_listview_destroy(GtkWidget *w, UiListView *v) {
+    gtk_tree_view_set_model(GTK_TREE_VIEW(w), NULL);
+    ui_destroy_boundvar(v->obj->ctx, v->var);
+    // TODO: destroy model?
+    free(v);
+}
+
+void ui_combobox_destroy(GtkWidget *w, UiListView *v) {
+    gtk_combo_box_set_model(GTK_COMBO_BOX(w), NULL);
+    ui_destroy_boundvar(v->obj->ctx, v->var);
+    // TODO: destroy model?
+    free(v);
+}
+
+
+void ui_listview_activate_event(
+        GtkTreeView *treeview,
+        GtkTreePath *path,
+        GtkTreeViewColumn *column,
+        UiTreeEventData *event)
+{
+    UiListSelection *selection = ui_listview_selection(
+            gtk_tree_view_get_selection(treeview),
+            event);
+    
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.eventdata = selection;
+    e.intval = selection->count > 0 ? selection->rows[0] : -1;
+    event->activate(&e, event->userdata);
+    
+    if(selection->count > 0) {
+        free(selection->rows);
+    }
+    free(selection);
+}
+
+void ui_listview_selection_event(
+        GtkTreeSelection *treeselection,
+        UiTreeEventData *event)
+{
+    UiListSelection *selection = ui_listview_selection(treeselection, event);
+    
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.eventdata = selection;
+    e.intval = selection->count > 0 ? selection->rows[0] : -1;
+    event->selection(&e, event->userdata);
+    
+    if(selection->count > 0) {
+        free(selection->rows);
+    }
+    free(selection);
+}
+
+UiListSelection* ui_listview_selection(
+        GtkTreeSelection *selection,
+        UiTreeEventData *event)
+{
+    GList *rows = gtk_tree_selection_get_selected_rows(selection, NULL);
+    
+    UiListSelection *ls = malloc(sizeof(UiListSelection));
+    ls->count = g_list_length(rows);
+    ls->rows = calloc(ls->count, sizeof(int));
+    GList *r = rows;
+    int i = 0;
+    while(r) {
+        GtkTreePath *path = r->data;
+        ls->rows[i] = ui_tree_path_list_index(path);
+        r = r->next;
+        i++;
+    }
+    return ls;
+}
+
+int ui_tree_path_list_index(GtkTreePath *path) {
+    int depth = gtk_tree_path_get_depth(path);
+    if(depth == 0) {
+        fprintf(stderr, "UiError: treeview selection: depth == 0\n");
+        return -1;
+    }
+    int *indices = gtk_tree_path_get_indices(path);
+    return indices[depth - 1];
+}
+
+
+/* --------------------------- ComboBox ---------------------------  */
+
+UIWIDGET ui_combobox_str(UiObject *obj, UiList *list, ui_callback f, void *udata) {
+    return ui_combobox(obj, list, ui_strmodel_getvalue, f, udata);
+}
+
+UIWIDGET ui_combobox(UiObject *obj, UiList *list, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = list;
+    var->type = UI_VAR_SPECIAL;
+    return ui_combobox_var(obj, var, getvalue, f, udata);
+}
+
+UIWIDGET ui_combobox_nv(UiObject *obj, char *varname, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_LIST);
+    if(var) {
+        return ui_combobox_var(obj, var, getvalue, f, udata);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+UIWIDGET ui_combobox_var(UiObject *obj, UiVar *var, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
+    UiModel *model = ui_model(obj->ctx, UI_STRING, "", -1);
+    model->getvalue = getvalue;
+    UiListModel *listmodel = ui_list_model_new(obj, var, model);
+    
+    GtkWidget *combobox = ui_create_combobox(obj, listmodel, f, udata);
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, combobox, FALSE);
+    return combobox;
+}
+
+GtkWidget* ui_create_combobox(UiObject *obj, UiListModel *model, ui_callback f, void *udata) {
+    GtkWidget *combobox = gtk_combo_box_new_with_model(GTK_TREE_MODEL(model));
+    
+    UiListView *uicbox = malloc(sizeof(UiListView));
+    uicbox->obj = obj;
+    uicbox->widget = combobox;
+    uicbox->var = model->var;
+    uicbox->model = model->model;
+    
+    g_signal_connect(
+                combobox,
+                "destroy",
+                G_CALLBACK(ui_combobox_destroy),
+                uicbox);
+    
+    // bind var
+    UiList *list = model->var->value;
+    list->update = ui_combobox_modelupdate;
+    list->obj = uicbox;
+    
+    GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
+    gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(combobox), renderer, TRUE);
+    gtk_cell_layout_set_attributes(
+            GTK_CELL_LAYOUT(combobox),
+            renderer,
+            "text",
+            0,
+            NULL);
+    gtk_combo_box_set_active(GTK_COMBO_BOX(combobox), 0);
+    
+    // add callback
+    if(f) {
+        UiEventData *event = ui_malloc(obj->ctx, sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = udata;
+        event->callback = f;
+        event->value = 0;
+
+        g_signal_connect(
+                combobox,
+                "changed",
+                G_CALLBACK(ui_combobox_change_event),
+                event);
+    }
+    
+    return combobox;
+}
+
+void ui_combobox_change_event(GtkComboBox *widget, UiEventData *e) {
+    UiEvent event;
+    event.obj = e->obj;
+    event.window = event.obj->window;
+    event.document = event.obj->ctx->document;
+    event.eventdata = NULL;
+    event.intval = gtk_combo_box_get_active(widget);
+    e->callback(&event, e->userdata);
+}
+
+void ui_combobox_modelupdate(UiList *list, int i) {
+    UiListView *view = list->obj;
+    UiListModel *model = ui_list_model_new(view->obj, view->var, view->model);
+    gtk_combo_box_set_model(GTK_COMBO_BOX(view->widget), GTK_TREE_MODEL(model));
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/tree.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,88 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TREE_H
+#define	TREE_H
+
+#include "../ui/tree.h"
+#include "toolkit.h"
+#include "model.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiListView {
+    UiObject    *obj;
+    GtkWidget   *widget;
+    UiVar       *var;
+    UiModel     *model;
+} UiListView;
+
+typedef struct UiTreeEventData {
+    UiObject    *obj;
+    ui_callback activate;
+    ui_callback selection;
+    void        *userdata;
+} UiTreeEventData;
+    
+void* ui_strmodel_getvalue(void *elm, int column);
+
+UIWIDGET ui_listview_var(UiObject *obj, UiVar *var, ui_getvaluefunc getvalue, ui_callback f, void *udata);
+UIWIDGET ui_table_var(UiObject *obj, UiVar *var, UiModel *model, UiListCallbacks cb);
+
+GtkWidget* ui_get_tree_widget(UIWIDGET widget);
+
+void ui_listview_update(UiList *list, int i);
+void ui_combobox_destroy(GtkWidget *w, UiListView *v);
+void ui_listview_destroy(GtkWidget *w, UiListView *v);
+
+void ui_listview_activate_event(
+        GtkTreeView *tree_view,
+        GtkTreePath *path,
+        GtkTreeViewColumn *column,
+        UiTreeEventData *event);
+void ui_listview_selection_event(
+        GtkTreeSelection *treeselection,
+        UiTreeEventData *event);
+UiListSelection* ui_listview_selection(
+        GtkTreeSelection *selection,
+        UiTreeEventData *event);
+int ui_tree_path_list_index(GtkTreePath *path);
+
+UIWIDGET ui_combobox_var(UiObject *obj, UiVar *var, ui_getvaluefunc getvalue, ui_callback f, void *udata);
+GtkWidget* ui_create_combobox(UiObject *obj, UiListModel *model, ui_callback f, void *udata);
+void ui_combobox_change_event(GtkComboBox *widget, UiEventData *e);
+void ui_combobox_modelupdate(UiList *list, int i);
+        
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* TREE_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/window.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,187 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../ui/window.h"
+#include "../ui/properties.h"
+#include "../common/context.h"
+
+#include "menu.h"
+#include "toolbar.h"
+#include "container.h"
+
+static int nwindows = 0;
+
+static int window_default_width = 650;
+static int window_default_height = 550;
+
+void ui_exit_event(GtkWidget *widget, gpointer data) {
+    UiObject *obj = data;
+    UiEvent ev;
+    ev.window = obj->window;
+    ev.document = obj->ctx->document;
+    ev.obj = obj;
+    ev.eventdata = NULL;
+    ev.intval = 0;
+    
+    if(obj->ctx->close_callback) {
+        obj->ctx->close_callback(&ev, obj->ctx->close_data);
+    }
+    // TODO: free UiObject
+    
+    nwindows--;
+#ifdef UI_GTK2
+    if(nwindows == 0) {
+        gtk_main_quit();
+    }
+#endif
+}
+
+static UiObject* create_window(char *title, void *window_data, UiBool simple) {
+    UcxMempool *mp = ucx_mempool_new(256);
+    UiObject *obj = ucx_mempool_calloc(mp, 1, sizeof(UiObject)); 
+    
+#ifndef UI_GTK2
+    obj->widget = gtk_application_window_new(ui_get_application());
+#else
+    obj->widget = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+#endif
+    
+    
+    obj->ctx = uic_context(obj, mp);
+    obj->window = window_data;
+    
+    if(title != NULL) {
+        gtk_window_set_title(GTK_WINDOW(obj->widget), title);
+    }
+    
+    char *width = ui_get_property("ui.window.width");
+    char *height = ui_get_property("ui.window.height");
+    if(width && height) {
+        gtk_window_set_default_size(
+                GTK_WINDOW(obj->widget),
+                atoi(width),
+                atoi(height));
+    } else {
+        gtk_window_set_default_size(
+                GTK_WINDOW(obj->widget),
+                window_default_width,
+                window_default_height);
+    }
+    
+    g_signal_connect(
+            obj->widget,
+            "destroy",
+            G_CALLBACK(ui_exit_event),
+            obj);
+    
+    GtkWidget *vbox = ui_gtk_vbox_new(0);
+    gtk_container_add(GTK_CONTAINER(obj->widget), vbox);
+    
+    if(!simple) {
+        // menu
+        GtkWidget *mb = ui_create_menubar(obj);
+        if(mb) {
+            gtk_box_pack_start(GTK_BOX(vbox), mb, FALSE, FALSE, 0);
+        }
+
+        // toolbar
+        GtkWidget *tb = ui_create_toolbar(obj);
+        if(tb) {
+            gtk_box_pack_start(GTK_BOX(vbox), tb, FALSE, FALSE, 0);
+        }
+    }
+    
+    // window content
+    // the content has a (TODO: not yet) configurable frame
+    GtkWidget *frame = gtk_frame_new(NULL);
+    gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_NONE);
+    gtk_box_pack_start(GTK_BOX(vbox), frame, TRUE, TRUE, 0);
+    
+    // content vbox
+    GtkWidget *content_box = ui_gtk_vbox_new(0);
+    gtk_container_add(GTK_CONTAINER(frame), content_box);
+    obj->container = ui_box_container(obj, content_box);
+    
+    nwindows++;
+    return obj;
+}
+
+
+UiObject* ui_window(char *title, void *window_data) {
+    return create_window(title, window_data, FALSE);
+}
+
+UiObject* ui_simplewindow(char *title, void *window_data) {
+    return create_window(title, window_data, TRUE);
+}
+
+static char* ui_gtkfilechooser(UiObject *obj, GtkFileChooserAction action) {
+    char *button;
+    char *title;
+    
+    if(action == GTK_FILE_CHOOSER_ACTION_OPEN) {
+        button = GTK_STOCK_OPEN;
+        title = "Datei öffnen...";
+    } else {
+        button = GTK_STOCK_SAVE;
+        title = "Datei speichern...";
+    }
+    
+    GtkWidget *dialog = gtk_file_chooser_dialog_new(
+                                title,
+                                GTK_WINDOW(obj->widget),
+                                action,
+                                GTK_STOCK_CANCEL,
+                                GTK_RESPONSE_CANCEL,
+                                button,
+                                GTK_RESPONSE_ACCEPT,
+                                NULL);
+    if(gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_ACCEPT) {
+        char *file = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dialog));
+        gtk_widget_destroy(dialog);
+        char *copy = strdup(file);
+        g_free(file);
+        return copy;
+    } else {
+        gtk_widget_destroy(dialog);
+        return NULL;
+    }
+}
+
+char* ui_openfiledialog(UiObject *obj) {
+    return ui_gtkfilechooser(obj, GTK_FILE_CHOOSER_ACTION_OPEN);
+}
+
+char* ui_savefiledialog(UiObject *obj) {
+    return ui_gtkfilechooser(obj, GTK_FILE_CHOOSER_ACTION_SAVE);
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/Makefile	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,33 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2012 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+$(MOTIF_OBJPRE)%.o: motif/%.c
+	$(CC) -o $@ -c -I../ucx $(CFLAGS) $(TK_CFLAGS) $<
+
+$(UI_LIB): $(OBJ)
+	$(AR) $(ARFLAGS) $(UI_LIB) $(OBJ)	
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/button.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,207 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "button.h"
+#include "container.h"
+#include "../common/context.h"
+#include <ucx/mempool.h>
+
+
+UIWIDGET ui_button(UiObject *obj, char *label, ui_callback f, void *data) {
+    UiContainer *ct = uic_get_current_container(obj);
+    XmString str = XmStringCreateLocalized(label);
+    
+    int n = 0;
+    Arg args[16];
+    
+    XtSetArg(args[n], XmNlabelString, str);
+    n++;
+    
+    Widget parent = ct->prepare(ct, args, &n, FALSE);
+    Widget button = XmCreatePushButton(parent, "button", args, n);
+    ct->add(ct, button);
+    
+    if(f) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = data;
+        event->callback = f;
+        event->value = 0;
+        XtAddCallback(
+                button,
+                XmNactivateCallback,
+                (XtCallbackProc)ui_push_button_callback,
+                event);
+    }
+    
+    XtManageChild(button);
+    
+    return button;
+}
+
+// wrapper
+int64_t ui_toggle_button_get(UiInteger *i) {
+    int state = 0;
+    XtVaGetValues(i->obj, XmNset, &state, NULL);
+    i->value = state;
+    return state;
+}
+
+void ui_toggle_button_set(UiInteger *i, int64_t value) {
+    Arg arg;
+    XtSetArg(arg, XmNset, value);
+    XtSetValues(i->obj, &arg, 1);
+    i->value = value;
+}
+
+void ui_toggle_button_callback(
+        Widget widget,
+        UiEventData *event,
+        XmToggleButtonCallbackStruct *tb)
+{
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    // TODO: e.document
+    e.intval = tb->set;
+    event->callback(&e, event->userdata); 
+}
+
+void ui_push_button_callback(Widget widget, UiEventData *event, XtPointer d) {
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.intval = event->value;
+    event->callback(&e, event->userdata);
+}
+
+
+static void radio_callback(
+        Widget widget,
+        RadioEventData *event,
+        XmToggleButtonCallbackStruct *tb)
+{
+    if(tb->set) {
+        RadioButtonGroup *group = event->group;
+        if(group->current) {
+            Arg arg;
+            XtSetArg(arg, XmNset, FALSE);
+            XtSetValues(group->current, &arg, 1);
+        }
+        group->current = widget;
+    }
+}
+
+UIWIDGET ui_radiobutton(UiObject *obj, char *label, UiInteger *rgroup) {
+    UiContainer *ct = uic_get_current_container(obj);
+    XmString str = XmStringCreateLocalized(label);
+    
+    int n = 0;
+    Arg args[16];
+    
+    XtSetArg(args[n], XmNlabelString, str);
+    n++;
+    XtSetArg(args[n], XmNindicatorType, XmONE_OF_MANY_ROUND);
+    n++;
+    
+    Widget parent = ct->prepare(ct, args, &n, FALSE);
+    Widget button = XmCreateToggleButton(parent, "radiobutton", args, n);
+    ct->add(ct, button);
+    
+    if(rgroup) {
+        RadioButtonGroup *group;
+        if(rgroup->obj) {
+            group = rgroup->obj;
+            group->buttons = ucx_list_append(group->buttons, button);
+            group->ref++;
+        } else {
+            group = malloc(sizeof(RadioButtonGroup));
+            group->buttons = ucx_list_append(NULL, button);
+            group->current = button;
+            // this is the first button in the radiobutton group
+            // so we should enable it
+            Arg arg;
+            XtSetArg(arg, XmNset, TRUE);
+            XtSetValues(button, &arg, 1);
+            rgroup->obj = group;
+            
+            group->current = button;
+        }
+        
+        RadioEventData *event = malloc(sizeof(RadioEventData));
+        event->obj = obj;
+        event->callback = NULL;
+        event->userdata = NULL;
+        event->group = group;
+        XtAddCallback(
+            button,
+            XmNvalueChangedCallback,
+            (XtCallbackProc)radio_callback,
+            event);
+        
+        rgroup->get = ui_radiobutton_get;
+        rgroup->set = ui_radiobutton_set;
+    }
+    
+    XtManageChild(button); 
+    return button;
+}
+
+int64_t ui_radiobutton_get(UiInteger *value) {
+    RadioButtonGroup *group = value->obj;
+    
+    int i = ucx_list_find(group->buttons, group->current, NULL, NULL);
+    if (i >= 0) {
+        value->value = i;
+        return i;
+    } else {
+        return 0;
+    }
+}
+
+void ui_radiobutton_set(UiInteger *value, int64_t i) {
+    RadioButtonGroup *group = value->obj;
+    Arg arg;
+    
+    XtSetArg(arg, XmNset, FALSE);
+    XtSetValues(group->current, &arg, 1);
+    
+    UcxList *elm = ucx_list_get(group->buttons, i);
+    if(elm) {
+        Widget button = elm->data;
+        XtSetArg(arg, XmNset, TRUE);
+        XtSetValues(button, &arg, 1);
+        group->current = button;
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/button.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,69 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef BUTTON_H
+#define	BUTTON_H
+
+#include "../ui/button.h"
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+    UcxList *buttons;
+    Widget  current;
+    int     ref;
+} RadioButtonGroup;
+
+typedef struct {
+    UiObject         *obj;
+    ui_callback      callback;
+    void             *userdata;
+    RadioButtonGroup *group;
+} RadioEventData;
+
+// wrapper
+int64_t ui_toggle_button_get(UiInteger *i);
+void ui_toggle_button_set(UiInteger *i, int64_t value);
+void ui_toggle_button_callback(
+        Widget widget,
+        UiEventData *data,
+        XmToggleButtonCallbackStruct *e);
+void ui_push_button_callback(Widget widget, UiEventData *event, XtPointer d);
+
+int64_t ui_radiobutton_get(UiInteger *value);
+void ui_radiobutton_set(UiInteger *value, int64_t i);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* BUTTON_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/container.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,807 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+#include "container.h"
+#include "../common/context.h"
+#include "../common/object.h"
+
+#define UI_GRID_MAX_COLUMNS 512
+
+static UiBool ui_lb2bool(UiLayoutBool b) {
+    return b == UI_LAYOUT_TRUE ? TRUE : FALSE;
+}
+
+static UiLayoutBool ui_bool2lb(UiBool b) {
+    return b ? UI_LAYOUT_TRUE : UI_LAYOUT_FALSE;
+}
+
+
+UiContainer* ui_frame_container(UiObject *obj, Widget frame) {
+    UiContainer *ct = ucx_mempool_calloc(
+            obj->ctx->mempool,
+            1,
+            sizeof(UiContainer));
+    ct->widget = frame;
+    ct->prepare = ui_frame_container_prepare;
+    ct->add = ui_frame_container_add;
+    return ct;
+}
+
+Widget ui_frame_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill) {
+    return ct->widget;
+}
+
+void ui_frame_container_add(UiContainer *ct, Widget widget) {
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+
+
+UiContainer* ui_box_container(UiObject *obj, Widget box, int margin, int spacing, UiBoxOrientation orientation) {
+    UiBoxContainer *ct = ucx_mempool_calloc(
+            obj->ctx->mempool,
+            1,
+            sizeof(UiBoxContainer));
+    ct->container.widget = box;
+    ct->container.prepare = ui_box_container_prepare;
+    ct->container.add = ui_box_container_add;
+    ct->orientation = orientation;
+    ct->margin = margin;
+    ct->spacing = spacing;
+    return (UiContainer*)ct;
+}
+
+Widget ui_box_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill) {
+    UiBoxContainer *bc = (UiBoxContainer*)ct;
+    if(ct->layout.fill != UI_LAYOUT_UNDEFINED) {
+        fill = ui_lb2bool(ct->layout.fill);
+    }
+    
+    if(bc->has_fill && fill) {
+        fprintf(stderr, "UiError: container has 2 filled widgets");
+        fill = FALSE;
+    }
+    if(fill) {
+        bc->has_fill = TRUE;
+    }
+    
+    int a = *n;
+    // determine fixed and dynamic attachments
+    void *f1;
+    void *f2;
+    void *d1;
+    void *d2;
+    void *w1;
+    void *w2;
+    if(bc->orientation == UI_BOX_VERTICAL) {
+        f1 = XmNleftAttachment;
+        f2 = XmNrightAttachment;
+        d1 = XmNtopAttachment;
+        d2 = XmNbottomAttachment;
+        w1 = XmNtopWidget;
+        w2 = XmNbottomWidget;
+        
+        // margin/spacing
+        XtSetArg(args[a], XmNleftOffset, bc->margin); a++;
+        XtSetArg(args[a], XmNrightOffset, bc->margin); a++;
+        
+        XtSetArg(args[a], XmNtopOffset, bc->prev_widget ? bc->spacing : bc->margin); a++;
+    } else {
+        f1 = XmNtopAttachment;
+        f2 = XmNbottomAttachment;
+        d1 = XmNleftAttachment;
+        d2 = XmNrightAttachment;
+        w1 = XmNleftWidget;
+        w2 = XmNrightWidget;
+        
+        // margin/spacing
+        XtSetArg(args[a], XmNtopOffset, bc->margin); a++;
+        XtSetArg(args[a], XmNbottomOffset, bc->margin); a++;
+        
+        XtSetArg(args[a], XmNleftOffset, bc->prev_widget ? bc->spacing : bc->margin); a++;
+    }
+    XtSetArg(args[a], f1, XmATTACH_FORM); a++;
+    XtSetArg(args[a], f2, XmATTACH_FORM); a++;
+
+    if(fill) {
+        XtSetArg(args[a], d2, XmATTACH_FORM); a++;
+    }
+    if(bc->prev_widget) {
+        XtSetArg(args[a], d1, XmATTACH_WIDGET); a++;
+        XtSetArg(args[a], w1, bc->prev_widget); a++;
+    } else {
+        XtSetArg(args[a], d1, XmATTACH_FORM); a++;
+    }
+    
+    *n = a;
+    return ct->widget;
+}
+
+void ui_box_container_add(UiContainer *ct, Widget widget) {
+    UiBoxContainer *bc = (UiBoxContainer*)ct;
+    // determine dynamic attachments
+    void *d1;
+    void *d2;
+    void *w1;
+    void *w2;
+    if(bc->orientation == UI_BOX_VERTICAL) {
+        d1 = XmNtopAttachment;
+        d2 = XmNbottomAttachment;
+        w1 = XmNtopWidget;
+        w2 = XmNbottomWidget;
+        
+    } else {
+        d1 = XmNleftAttachment;
+        d2 = XmNrightAttachment;
+        w1 = XmNleftWidget;
+        w2 = XmNrightWidget;
+    }
+    
+    if(bc->prev_widget) {
+        int v = 0;
+        XtVaGetValues(bc->prev_widget, d2, &v, 0);
+        if(v == XmATTACH_FORM) {
+            XtVaSetValues(
+                    bc->prev_widget,
+                    d2,
+                    XmATTACH_WIDGET,
+                    w2,
+                    widget,
+                    0);
+            XtVaSetValues(
+                    widget,
+                    d1,
+                    XmATTACH_NONE,
+                    d2,
+                    XmATTACH_FORM,
+                    0);
+        }
+    }
+    bc->prev_widget = widget;
+    
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+
+UiContainer* ui_grid_container(UiObject *obj, Widget form, int columnspacing, int rowspacing) {
+    UiGridContainer *ct = ucx_mempool_calloc(
+            obj->ctx->mempool,
+            1,
+            sizeof(UiGridContainer));
+    ct->container.widget = form;
+    ct->container.prepare = ui_grid_container_prepare;
+    ct->container.add = ui_grid_container_add;
+    ct->columnspacing = columnspacing;
+    ct->rowspacing = rowspacing;
+    return (UiContainer*)ct;
+}
+
+void ui_grid_newline(UiGridContainer *grid) {
+    if(grid->current) {
+        grid->current = NULL;
+    }
+    grid->container.layout.newline = FALSE;
+}
+
+Widget ui_grid_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill) {
+    UiGridContainer *grid = (UiGridContainer*)ct;
+    if(ct->layout.newline) {
+        ui_grid_newline(grid);
+    }
+    return ct->widget;
+}
+
+void ui_grid_container_add(UiContainer *ct, Widget widget) {
+    UiGridContainer *grid = (UiGridContainer*)ct;
+    
+    if(grid->current) {
+        grid->current = ucx_list_append(grid->current, widget);
+    } else {
+        grid->current = ucx_list_append(grid->current, widget);
+        grid->lines = ucx_list_append(grid->lines, grid->current);
+    }
+    
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+
+static void ui_grid_resize(Widget widget, XtPointer udata, XtPointer cdata) {
+    UiGridContainer *grid = udata;
+    
+    UcxList *rowdim = NULL;
+    int coldim[UI_GRID_MAX_COLUMNS];
+    memset(coldim, 0, UI_GRID_MAX_COLUMNS*sizeof(int));
+    int numcol = 0;
+    
+    // get the minimum size of the columns and rows
+    int sumw = 0;
+    int sumh = 0;
+    UCX_FOREACH(row, grid->lines) {
+        int rheight = 0;
+        int i=0;
+        int sum_width = 0;
+        UCX_FOREACH(elm, row->data) {
+            Widget w = elm->data;
+            int widget_width = 0;
+            int widget_height = 0;
+            XtVaGetValues(
+                    w,
+                    XmNwidth,
+                    &widget_width,
+                    XmNheight,
+                    &widget_height, 
+                    0);
+            
+            // get the maximum height in this row
+            if(widget_height > rheight) {
+                rheight = widget_height;
+            }
+            
+            // get the maximum width in this column
+            if(widget_width > coldim[i]) {
+                coldim[i] = widget_width;
+            }
+            sum_width += widget_width;
+            if(sum_width > sumw) {
+                sumw = sum_width;
+            }
+            
+            i++;
+            if(i > numcol) {
+                numcol = i;
+            }
+        }
+        rowdim = ucx_list_append(rowdim, (void*)(intptr_t)rheight);
+        sumh += rheight;
+    }
+    
+    // check container size
+    int gwidth = 0;
+    int gheight = 0;
+    XtVaGetValues(widget, XmNwidth, &gwidth, XmNheight, &gheight, NULL);
+    if(gwidth < sumw || gheight < sumh) {
+        XtVaSetValues(widget, XmNwidth, sumw, XmNheight, sumh, NULL);
+        ucx_list_free(rowdim);
+        return;
+    }
+    
+    
+    // adjust the positions of all children
+    int y = 0;
+    UCX_FOREACH(row, grid->lines) {
+        int x = 0;       
+        int i=0;
+        UCX_FOREACH(elm, row->data) {
+            Widget w = elm->data;
+            XtVaSetValues(
+                    w,
+                    XmNx, x,
+                    XmNy, y,
+                    XmNwidth, coldim[i],
+                    XmNheight, rowdim->data,
+                    NULL);
+            
+            x += coldim[i];
+            i++;
+        }
+        y += (intptr_t)rowdim->data;
+        rowdim = rowdim->next;
+    }
+    
+    ucx_list_free(rowdim);
+}
+
+UiContainer* ui_scrolledwindow_container(UiObject *obj, Widget scrolledwindow) {
+    UiContainer *ct = ucx_mempool_calloc(
+            obj->ctx->mempool,
+            1,
+            sizeof(UiContainer));
+    ct->widget = scrolledwindow;
+    ct->prepare = ui_scrolledwindow_container_prepare;
+    ct->add = ui_scrolledwindow_container_add;
+    return ct;
+}
+
+Widget ui_scrolledwindow_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill) {
+    return ct->widget;
+}
+
+void ui_scrolledwindow_container_add(UiContainer *ct, Widget widget) {
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+
+
+UiContainer* ui_tabview_container(UiObject *obj, Widget frame) {
+    UiTabViewContainer *ct = ucx_mempool_calloc(
+            obj->ctx->mempool,
+            1,
+            sizeof(UiTabViewContainer));
+    ct->context = obj->ctx;
+    ct->container.widget = frame;
+    ct->container.prepare = ui_tabview_container_prepare;
+    ct->container.add = ui_tabview_container_add;
+    return (UiContainer*)ct;
+}
+
+Widget ui_tabview_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill) {
+    int a = *n;
+    XtSetArg(args[a], XmNleftAttachment, XmATTACH_FORM); a++;
+    XtSetArg(args[a], XmNrightAttachment, XmATTACH_FORM); a++;
+    XtSetArg(args[a], XmNtopAttachment, XmATTACH_FORM); a++;
+    XtSetArg(args[a], XmNbottomAttachment, XmATTACH_FORM); a++;
+    *n = a;
+    return ct->widget;
+}
+
+void ui_tabview_container_add(UiContainer *ct, Widget widget) {
+    UiTabViewContainer *tabview = (UiTabViewContainer*)ct; 
+    
+    if(tabview->current) {
+        XtUnmanageChild(tabview->current);
+    }
+
+    tabview->current = widget;
+    tabview->tabs = ucx_list_append(tabview->tabs, widget);
+    
+    ui_select_tab(ct->widget, 0);
+    ui_reset_layout(ct->layout);
+    ct->current = widget;
+}
+
+UIWIDGET ui_box(UiObject *obj, int margin, int spacing, UiBoxOrientation orientation) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    Arg args[16];
+    int n = 0;
+    Widget parent = ct->prepare(ct, args, &n, TRUE);
+    Widget form = XmCreateForm(parent, "vbox", args, n);
+    ct->add(ct, form);
+    XtManageChild(form);
+    
+    UiObject *newobj = uic_object_new(obj, form);
+    newobj->container = ui_box_container(obj, form, margin, spacing, orientation);
+    uic_obj_add(obj, newobj);
+    
+    return form;
+}
+
+UIWIDGET ui_vbox(UiObject *obj) {
+    return ui_box(obj, 0, 0, UI_BOX_VERTICAL);
+}
+
+UIWIDGET ui_hbox(UiObject *obj) {
+    return ui_box(obj, 0, 0, UI_BOX_HORIZONTAL);
+}
+
+UIWIDGET ui_vbox_sp(UiObject *obj, int margin, int spacing) {
+    return ui_box(obj, margin, spacing, UI_BOX_VERTICAL);
+}
+
+UIWIDGET ui_hbox_sp(UiObject *obj, int margin, int spacing) {
+    return ui_box(obj, margin, spacing, UI_BOX_HORIZONTAL);
+}
+
+UIWIDGET ui_grid(UiObject *obj) {
+    return ui_grid_sp(obj, 0, 0, 0);
+}
+
+UIWIDGET ui_grid_sp(UiObject *obj, int margin, int columnspacing, int rowspacing) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    Arg args[16];
+    int n = 0;
+    Widget parent = ct->prepare(ct, args, &n, TRUE);
+    Widget grid = XmCreateDrawingArea(parent, "grid", args, n);
+    ct->add(ct, grid);
+    XtManageChild(grid);
+    
+    UiObject *newobj = uic_object_new(obj, grid);
+    newobj->container = ui_grid_container(obj, grid, columnspacing, rowspacing);
+    uic_obj_add(obj, newobj);
+    
+    XtAddCallback (grid, XmNresizeCallback , ui_grid_resize, newobj->container);
+    
+    return grid;
+}
+
+UIWIDGET ui_scrolledwindow(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    Arg args[16];
+    int n = 0;
+    XtSetArg(args[n], XmNscrollingPolicy, XmAUTOMATIC); // TODO: dosn't work, use XmAPPLICATION_DEFINED
+    n++;
+    Widget parent = ct->prepare(ct, args, &n, TRUE);
+    Widget scrolledwindow = XmCreateScrolledWindow(parent, "scrolledwindow", args, n);
+    ct->add(ct, scrolledwindow);
+    XtManageChild(scrolledwindow);
+    
+    UiObject *newobj = uic_object_new(obj, scrolledwindow);
+    newobj->container = ui_scrolledwindow_container(obj, scrolledwindow);
+    uic_obj_add(obj, newobj);
+    
+    return scrolledwindow;
+}
+
+UIWIDGET ui_sidebar(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    Arg args[16];
+    int n = 0;
+    
+    XtSetArg(args[n], XmNorientation, XmHORIZONTAL);
+    n++;
+    
+    Widget parent = ct->prepare(ct, args, &n, TRUE);
+    Widget pane = XmCreatePanedWindow(parent, "pane", args, n);
+    ct->add(ct, pane);
+    XtManageChild(pane);
+    
+    // add sidebar widget
+    Widget sidebar = XmCreateForm(pane, "sidebar", args, 0);
+    XtManageChild(sidebar);
+    
+    UiObject *left = uic_object_new(obj, sidebar);
+    left->container = ui_box_container(left, sidebar, 0, 0, UI_BOX_VERTICAL);
+    
+    // add content widget
+    XtSetArg (args[0], XmNpaneMaximum, 8000);
+    Widget content = XmCreateForm(pane, "content_area", args, 1);
+    XtManageChild(content);
+    
+    UiObject *right = uic_object_new(obj, content);
+    right->container = ui_box_container(right, content, 0, 0, UI_BOX_VERTICAL);
+    
+    uic_obj_add(obj, right);
+    uic_obj_add(obj, left);
+    
+    return sidebar;
+}
+
+UIWIDGET ui_tabview(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    // create a simple frame as container widget
+    // when tabs are selected, the current child will be replaced by the
+    // the new tab widget
+    Arg args[16];
+    int n = 0;
+    XtSetArg(args[n], XmNshadowType, XmSHADOW_ETCHED_OUT);
+    n++;
+    XtSetArg(args[n], XmNshadowThickness, 0);
+    n++;
+    Widget parent = ct->prepare(ct, args, &n, TRUE);
+    Widget form = XmCreateForm(parent, "tabview", args, n);
+    ct->add(ct, form);
+    XtManageChild(form);
+    
+    UiObject *tabviewobj = uic_object_new(obj, form);
+    tabviewobj->container = ui_tabview_container(obj, form);
+    uic_obj_add(obj, tabviewobj);
+    
+    XtVaSetValues(form, XmNuserData, tabviewobj->container, NULL);
+    
+    return form;
+}
+
+void ui_tab(UiObject *obj, char *title) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.label = title;
+    
+    ui_vbox(obj);
+}
+
+void ui_select_tab(UIWIDGET tabview, int tab) {
+    UiTabViewContainer *ct = NULL;
+    XtVaGetValues(tabview, XmNuserData, &ct, NULL);
+    if(ct) {
+        XtUnmanageChild(ct->current);
+        UcxList *elm = ucx_list_get(ct->tabs, tab);
+        if(elm) {
+            XtManageChild(elm->data);
+            ct->current = elm->data;
+        } else {
+            fprintf(stderr, "UiError: front tab index: %d\n", tab);
+        }
+    } else {
+        fprintf(stderr, "UiError: widget is not a tabview\n");
+    }
+}
+
+
+/* document tabview */
+
+static void ui_tabbar_resize(Widget widget, XtPointer udata, XtPointer cdata) {
+    MotifTabbedPane *v = (MotifTabbedPane*)udata;
+    
+    int width = 0;
+    int height = 0;
+    XtVaGetValues(widget, XmNwidth, &width, XmNheight, &height, NULL);
+    int button_width = width / 4;
+    int x = 0;
+    UCX_FOREACH(elm, v->tabs) {
+        UiTab *tab = elm->data;
+        XtVaSetValues(
+                tab->tab_button,
+                XmNx, x,
+                XmNy, 0,
+                XmNwidth,
+                button_width,
+                
+                NULL);
+        x += button_width;
+    }
+    
+    if(height <= v->height) {
+        XtVaSetValues(widget, XmNheight, v->height + 4, NULL);
+    }
+}
+
+static void ui_tabbar_expose(Widget widget, XtPointer udata, XtPointer cdata) {
+    MotifTabbedPane *v = (MotifTabbedPane*)udata;
+    XmDrawingAreaCallbackStruct *cbs = (XmDrawingAreaCallbackStruct *)cdata;
+    XEvent *event = cbs->event;
+    Display *dpy = XtDisplay(widget); 
+    
+    XGCValues gcvals;
+    GC gc;
+    Pixel fgpix;
+    
+    int tab_x;
+    int tab_width;
+    XtVaGetValues(v->current->tab_button, XmNx, &tab_x, XmNwidth, &tab_width, XmNhighlightColor, &fgpix, NULL);
+    
+    gcvals.foreground = v->bg1;
+    gc = XCreateGC( dpy, XtWindow(widget), (GCForeground), &gcvals);
+      
+    int width = 0;
+    int height = 0;
+    XtVaGetValues(widget, XmNwidth, &width, XmNheight, &height, NULL);
+    XFillRectangle(dpy, XtWindow(widget), gc, 0, 0, width, height);
+    
+    gcvals.foreground = fgpix;
+    gc = XCreateGC( dpy, XtWindow(widget), (GCForeground), &gcvals);
+    
+    XFillRectangle(dpy, XtWindow(widget), gc, tab_x, 0, tab_width, height);
+    
+}
+
+UiTabbedPane* ui_tabbed_document_view(UiObject *obj) {
+    int n = 0;
+    Arg args[16];
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    Widget parent = ct->prepare(ct, args, &n, TRUE);
+    
+    Widget tabview = XmCreateForm(parent, "tabview_form", args, n);
+    XtManageChild(tabview);
+    
+    XtSetArg(args[0], XmNorientation, XmHORIZONTAL);
+    XtSetArg(args[1], XmNpacking, XmPACK_TIGHT);
+    XtSetArg(args[2], XmNspacing, 1);
+    XtSetArg(args[3], XmNleftAttachment, XmATTACH_FORM);
+    XtSetArg(args[4], XmNrightAttachment, XmATTACH_FORM);
+    XtSetArg(args[5], XmNtopAttachment, XmATTACH_FORM);
+    XtSetArg(args[6], XmNmarginWidth, 0);
+    XtSetArg(args[7], XmNmarginHeight, 0);
+    Widget tabbar = XmCreateDrawingArea(tabview, "tabbar", args, 8);
+    XtManageChild(tabbar);
+    
+    XtSetArg(args[0], XmNleftAttachment, XmATTACH_FORM);
+    XtSetArg(args[1], XmNrightAttachment, XmATTACH_FORM);
+    XtSetArg(args[2], XmNtopAttachment, XmATTACH_WIDGET);
+    XtSetArg(args[3], XmNtopWidget, tabbar);
+    XtSetArg(args[4], XmNbottomAttachment, XmATTACH_FORM);
+    XtSetArg(args[5], XmNshadowThickness, 0);
+    Widget tabct = XmCreateForm(tabview, "tabview", args, 6);
+    XtManageChild(tabct);
+    
+    MotifTabbedPane *tabbedpane = ui_malloc(obj->ctx, sizeof(MotifTabbedPane));
+    tabbedpane->view.ctx = uic_current_obj(obj)->ctx;
+    tabbedpane->view.widget = tabct;
+    tabbedpane->view.document = NULL;
+    tabbedpane->tabbar = tabbar;
+    tabbedpane->tabs = NULL;
+    tabbedpane->current = NULL;
+    tabbedpane->height = 0;
+    
+    XtAddCallback(tabbar, XmNresizeCallback , ui_tabbar_resize, tabbedpane);
+    XtAddCallback(tabbar, XmNexposeCallback, ui_tabbar_expose, tabbedpane);
+    
+    return &tabbedpane->view;
+}
+
+UiObject* ui_document_tab(UiTabbedPane *view) {
+    MotifTabbedPane *v = (MotifTabbedPane*)view;
+    int n = 0;
+    Arg args[16];
+    
+    // hide the current tab content
+    if(v->current) {
+        XtUnmanageChild(v->current->content->widget);
+    }
+    
+    UiTab *tab = ui_malloc(view->ctx, sizeof(UiTab));
+    
+    // create the new tab content
+    XtSetArg(args[0], XmNshadowThickness, 0);
+    XtSetArg(args[1], XmNleftAttachment, XmATTACH_FORM);
+    XtSetArg(args[2], XmNrightAttachment, XmATTACH_FORM);
+    XtSetArg(args[3], XmNtopAttachment, XmATTACH_FORM);
+    XtSetArg(args[4], XmNbottomAttachment, XmATTACH_FORM);
+    XtSetArg(args[5], XmNuserData, tab);
+    Widget frame = XmCreateFrame(view->widget, "tab", args, 6);
+    XtManageChild(frame);
+    
+    UiObject *content = ui_malloc(view->ctx, sizeof(UiObject));
+    content->widget = NULL; // initialization for uic_context()
+    content->ctx = uic_context(content, view->ctx->mempool);
+    content->ctx->parent = view->ctx;
+    content->ctx->set_document = ui_tab_set_document;
+    content->ctx->detach_document = ui_tab_detach_document;
+    content->widget = frame;
+    content->window = view->ctx->obj->window;
+    content->container = ui_frame_container(content, frame);
+    content->next = NULL;
+    
+    // add tab button
+    v->tabs = ucx_list_append_a(view->ctx->mempool->allocator, v->tabs, tab);
+    
+    XmString label = XmStringCreateLocalized("tab");
+    XtSetArg(args[0], XmNlabelString, label);
+    XtSetArg(args[1], XmNshadowThickness, 0);
+    XtSetArg(args[2], XmNhighlightThickness, 0);
+    
+    Widget button = XmCreatePushButton(v->tabbar, "tab_button", args, 3);
+    tab->tabbedpane = v;
+    tab->content = content;
+    tab->tab_button = button; 
+    XtManageChild(button);
+    XtAddCallback(
+        button,
+        XmNactivateCallback,
+        (XtCallbackProc)ui_tab_button_callback,
+        tab);
+    
+    if(v->height == 0) {
+        XtVaGetValues(
+                button,
+                XmNarmColor,
+                &v->bg1,
+                XmNbackground,
+                &v->bg2,
+                XmNheight,
+                &v->height,
+                NULL);
+        v->height += 2; // border
+    }
+    
+    ui_change_tab(v, tab);
+    ui_tabbar_resize(v->tabbar, v, NULL);
+    
+    return content;
+}
+
+void ui_tab_button_callback(Widget widget, UiTab *tab, XtPointer d) {  
+    MotifTabbedPane *t = tab->tabbedpane;
+    if(t->current) {
+        XtUnmanageChild(t->current->content->widget);
+        XtVaSetValues(t->current->tab_button, XmNset, 0, NULL);
+    }
+    XtManageChild(tab->content->widget);
+    
+    ui_change_tab(t, tab);
+    
+}
+
+void ui_change_tab(MotifTabbedPane *pane, UiTab *tab) {
+    UiContext *ctx = tab->content->ctx;
+    ctx->parent->set_document(ctx->parent, ctx->document);
+    
+    if(pane->current) {
+        XtVaSetValues(pane->current->tab_button, XmNshadowThickness, 0, XmNbackground, pane->bg1, NULL);
+    }
+    XtVaSetValues(tab->tab_button, XmNshadowThickness, 1, XmNbackground, pane->bg2, NULL);
+    
+    pane->current = tab;
+    pane->index = ucx_list_find(pane->tabs, tab, NULL, NULL);
+    printf("index: %d\n", pane->index);
+    
+    // redraw tabbar
+    Display *dpy = XtDisplay(pane->tabbar);
+    Window window = XtWindow(pane->tabbar);
+    if(dpy && window) {
+        XClearArea(dpy, XtWindow(pane->tabbar), 0, 0, 0, 0, TRUE);
+        XFlush(dpy);
+    }
+}
+
+void ui_tab_set_document(UiContext *ctx, void *document) {
+    if(ctx->parent->document) {
+        //ctx->parent->detach_document(ctx->parent, ctx->parent->document);
+    }
+    uic_context_set_document(ctx, document);
+    //uic_context_set_document(ctx->parent, document);
+    //ctx->parent->document = document;
+    
+    UiTab *tab = NULL;
+    XtVaGetValues(
+            ctx->obj->widget,
+            XmNuserData,
+            &tab,
+            NULL);
+    if(tab) {
+        if(tab->tabbedpane->current == tab) {
+            ctx->parent->set_document(ctx->parent, ctx->document);
+        }
+    } else {
+        fprintf(stderr, "UiError: ui_bar_set_document: Cannot set document");
+    }
+}
+
+void ui_tab_detach_document(UiContext *ctx) {
+    uic_context_detach_document(ctx->parent);
+}
+
+
+/*
+ * -------------------- Layout Functions --------------------
+ * 
+ * functions for setting layout attributes for the current container
+ *
+ */
+
+void ui_layout_fill(UiObject *obj, UiBool fill) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.fill = ui_bool2lb(fill);
+}
+
+void ui_layout_hexpand(UiObject *obj, UiBool expand) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.hexpand = expand;
+}
+
+void ui_layout_vexpand(UiObject *obj, UiBool expand) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.vexpand = expand;
+}
+
+void ui_layout_gridwidth(UiObject *obj, int width) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.gridwidth = width;
+}
+
+void ui_newline(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.newline = TRUE;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/container.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,160 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CONTAINER_H
+#define	CONTAINER_H
+
+#include "../ui/toolkit.h"
+#include "../ui/container.h"
+#include <ucx/list.h>
+#include <string.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#define ui_reset_layout(layout) memset(&(layout), 0, sizeof(UiLayout))
+    
+typedef struct MotifTabbedPane    MotifTabbedPane;
+typedef struct UiTab              UiTab;
+typedef struct UiBoxContainer     UiBoxContainer;
+typedef struct UiGridContainer    UiGridContainer;
+typedef struct UiTabViewContainer UiTabViewContainer;
+typedef struct UiLayout           UiLayout;
+
+typedef Widget (*ui_container_add_f)(UiContainer*, Arg*, int*, UiBool);
+
+typedef enum UiLayoutBool     UiLayoutBool;
+typedef enum UiBoxOrientation UiBoxOrientation;
+
+
+enum UiLayoutBool {
+    UI_LAYOUT_UNDEFINED = 0,
+    UI_LAYOUT_TRUE,
+    UI_LAYOUT_FALSE,
+};
+
+enum UiBoxOrientation {
+    UI_BOX_VERTICAL = 0,
+    UI_BOX_HORIZONTAL
+};
+
+struct UiLayout {
+    UiLayoutBool fill;
+    UiBool       newline;
+    char         *label;
+    UiBool       hexpand;
+    UiBool       vexpand;
+    int          gridwidth;
+};
+
+struct UiContainer {
+    Widget   widget;
+    Widget   (*prepare)(UiContainer*, Arg *, int*, UiBool);
+    void     (*add)(UiContainer*, Widget);
+    UiLayout layout;
+    Widget   current;
+    Widget   menu;
+};
+
+struct UiBoxContainer {
+    UiContainer container;
+    Widget      prev_widget;
+    UiBool      has_fill;
+    UiBoxOrientation orientation;
+    int         margin;
+    int         spacing;
+};
+
+struct UiGridContainer {
+    UiContainer container;
+    UcxList     *lines;
+    UcxList     *current;
+    int         columnspacing;
+    int         rowspacing;
+};
+
+struct UiTabViewContainer {
+    UiContainer container;
+    UiContext   *context;
+    Widget      widget;
+    UcxList     *tabs;
+    Widget      current;
+};
+
+struct MotifTabbedPane {
+    UiTabbedPane view;
+    Widget       tabbar;
+    UcxList      *tabs;
+    UiTab        *current;
+    int          index;
+    Pixel        bg1;
+    Pixel        bg2;
+    int          height;
+};
+
+struct UiTab {
+    MotifTabbedPane *tabbedpane;
+    UiObject        *content;
+    Widget          tab_button;
+};
+    
+
+UiContainer* ui_frame_container(UiObject *obj, Widget frame);
+Widget ui_frame_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill);
+void ui_frame_container_add(UiContainer *ct, Widget widget);
+
+UiContainer* ui_box_container(UiObject *obj, Widget box, int margin, int spacing, UiBoxOrientation orientation);
+Widget ui_box_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill);
+void ui_box_container_add(UiContainer *ct, Widget widget);
+
+UiContainer* ui_grid_container(UiObject *obj, Widget form, int columnspacing, int rowspacing);
+Widget ui_grid_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill);
+void ui_grid_container_add(UiContainer *ct, Widget widget);
+
+UiContainer* ui_scrolledwindow_container(UiObject *obj, Widget scrolledwindow);
+Widget ui_scrolledwindow_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill);
+void ui_scrolledwindow_container_add(UiContainer *ct, Widget widget);
+
+UiContainer* ui_tabview_container(UiObject *obj, Widget rowcolumn);
+Widget ui_tabview_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill);
+void ui_tabview_container_add(UiContainer *ct, Widget widget);
+
+void ui_tab_button_callback(Widget widget, UiTab *tab, XtPointer d);
+void ui_change_tab(MotifTabbedPane *pane, UiTab *tab);
+
+void ui_tab_set_document(UiContext *ctx, void *document);
+void ui_tab_detach_document(UiContext *ctx);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* CONTAINER_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/dnd.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,45 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2018 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "dnd.h"
+
+void ui_selection_settext(UiSelection *sel, char *str, int len) {
+    
+}
+
+void ui_selection_seturis(UiSelection *sel, char **uris, int nelm) {
+    
+}
+
+char* ui_selection_gettext(UiSelection *sel) {
+    
+}
+
+char** ui_selection_geturis(UiSelection *sel, size_t *nelm) {
+    
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/dnd.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,46 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2018 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DND_H
+#define DND_H
+
+#include "../ui/dnd.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* DND_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/graphics.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,283 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <X11/Intrinsic.h>
+#include <X11/IntrinsicP.h>
+
+#include "graphics.h"
+
+#include "container.h"
+
+static void ui_drawingarea_expose(Widget widget, XtPointer u, XtPointer c) {
+    UiDrawEvent *drawevent = u;
+    //XmDrawingAreaCallbackStruct *cbs = (XmDrawingAreaCallbackStruct *)c;
+    //XEvent *event = cbs->event;
+    Display *dpy = XtDisplay(widget);
+    
+    UiEvent ev;
+    ev.obj = drawevent->obj;
+    ev.window = drawevent->obj->window;
+    ev.document = drawevent->obj->ctx->document;
+    ev.eventdata = NULL;
+    ev.intval = 0;
+    
+    XtVaGetValues(
+            widget,
+            XmNwidth,
+            &drawevent->gr.g.width,
+            XmNheight,
+            &drawevent->gr.g.height,
+            NULL);
+    
+    XGCValues gcvals;
+    gcvals.foreground = BlackPixelOfScreen(XtScreen(widget));
+    drawevent->gr.gc = XCreateGC(dpy, XtWindow(widget), (GCForeground), &gcvals);
+    
+    drawevent->callback(&ev, &drawevent->gr.g, drawevent->userdata);
+}
+
+UIWIDGET ui_drawingarea(UiObject *obj, ui_drawfunc f, void *userdata) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    int n = 0;
+    Arg args[16];
+    
+    Widget parent = ct->prepare(ct, args, &n, TRUE);
+    Widget drawingarea = XmCreateDrawingArea(parent, "drawingarea", args, n);
+    
+    if(f) {
+        UiDrawEvent *event = malloc(sizeof(UiDrawEvent));
+        event->obj = obj;
+        event->callback = f;
+        event->userdata = userdata;
+        
+        event->gr.display = XtDisplay(drawingarea);
+        event->gr.widget = drawingarea;
+        
+        Colormap colormap;
+        XtVaGetValues(drawingarea, XmNcolormap, &colormap, NULL);    
+        event->gr.colormap = colormap;
+        
+        XtAddCallback(
+                drawingarea,
+                XmNexposeCallback,
+                ui_drawingarea_expose,
+                event);
+        
+        XtVaSetValues(drawingarea, XmNuserData, event, NULL);
+    }
+    
+    XtManageChild(drawingarea);
+    return drawingarea;
+}
+
+static void ui_drawingarea_input(Widget widget, XtPointer u, XtPointer c) {
+    XmDrawingAreaCallbackStruct *cbs = (XmDrawingAreaCallbackStruct*)c;
+    XEvent *xevent = cbs->event;
+    UiMouseEventData *event = u;
+    
+    if (cbs->reason == XmCR_INPUT) {
+        if (xevent->xany.type == ButtonPress) {
+            UiMouseEvent me;
+            me.x = xevent->xbutton.x;
+            me.y = xevent->xbutton.y;
+            // TODO: configurable double click time
+            me.type = xevent->xbutton.time - event->last_event > 300 ? UI_PRESS : UI_PRESS2;
+            
+            UiEvent e;
+            e.obj = event->obj;
+            e.window = event->obj->window;
+            e.document = event->obj->ctx->document;
+            e.eventdata = &me;
+            e.intval = 0;
+            event->callback(&e, event->userdata);
+            
+            
+            event->last_event = me.type == UI_PRESS2 ? 0 : xevent->xbutton.time;
+        }
+    }
+    
+}
+
+void ui_drawingarea_mousehandler(UiObject *obj, UIWIDGET widget, ui_callback f, void *u) {
+    if(f) {
+        UiMouseEventData *event = malloc(sizeof(UiMouseEventData));
+        event->obj = obj;
+        event->callback = f;
+        event->userdata = u;
+        event->last_event = 0;
+        
+        XtAddCallback(widget, XmNinputCallback, ui_drawingarea_input, event);
+    }
+}
+
+void ui_drawingarea_getsize(UIWIDGET drawingarea, int *width, int *height) {
+    XtVaGetValues(
+            drawingarea,
+            XmNwidth,
+            width,
+            XmNheight,
+            height,
+            NULL);
+}
+
+void ui_drawingarea_redraw(UIWIDGET drawingarea) {
+    //XClearArea(XtDisplay(drawingarea), drawingarea->core.window, 0, 0, drawingarea->core.width, drawingarea->core.height, True);
+    UiDrawEvent *event;
+    XtVaGetValues(drawingarea, XmNuserData, &event, NULL);
+    ui_drawingarea_expose(drawingarea, event, NULL);
+}
+
+
+/* -------------------- text layout functions -------------------- */
+UiTextLayout* ui_text(UiGraphics *g) {
+    UiTextLayout *text = malloc(sizeof(UiTextLayout));
+    memset(text, 0, sizeof(UiTextLayout));
+    text->text = NULL;
+    text->length = 0;
+    text->widget = ((UiXlibGraphics*)g)->widget;
+    text->fontset = NULL;
+    return text;
+}
+
+static void create_default_fontset(UiTextLayout *layout) {
+    char **missing = NULL;
+    int num_missing = 0;
+    char *def = NULL;
+    Display *dpy = XtDisplay(layout->widget);
+    XFontSet fs = XCreateFontSet(
+        dpy,
+        "-dt-interface system-medium-r-normal-s*utf*:,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-iso8859-1,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-iso8859-10,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-iso8859-15,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-iso8859-2,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-iso8859-3,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-iso8859-4,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-iso8859-5,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-iso8859-9,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-koi8-e,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-koi8-r,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-koi8-ru,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-koi8-u,"
+                "-misc-liberation sans-medium-r-normal--0-0-0-0-p-0-koi8-uni,"
+                "-misc-fixed-medium-r-normal--14-130-75-75-c-140-jisx0208",
+        &missing, &num_missing, &def);
+    layout->fontset = fs;
+}
+
+void ui_text_free(UiTextLayout *text) {
+    // TODO
+}
+
+void ui_text_setstring(UiTextLayout *layout, char *str) {
+    ui_text_setstringl(layout, str, strlen(str));
+}
+
+void ui_text_setstringl(UiTextLayout *layout, char *str, int len) {
+    layout->text = str;
+    layout->length = len;
+    layout->changed = 1;
+}
+
+void ui_text_setfont(UiTextLayout *layout, char *font, int size) {
+    create_default_fontset(layout);//TODO
+    layout->changed = 1;
+}
+
+void ui_text_getsize(UiTextLayout *layout, int *width, int *height) {
+    if(layout->changed) {
+        XRectangle ext, lext;
+        XmbTextExtents(layout->fontset, layout->text, layout->length, &ext, &lext);
+        layout->width = ext.width;
+        layout->height = ext.height;
+        layout->changed = 0;
+    }
+    *width = layout->width;
+    *height = layout->height;
+}
+
+void ui_text_setwidth(UiTextLayout *layout, int width) {
+    layout->maxwidth = width;
+}
+
+
+/* -------------------- drawing functions -------------------- */
+
+void ui_graphics_color(UiGraphics *g, int red, int green, int blue) {
+    UiXlibGraphics *gr = (UiXlibGraphics*)g;
+    XColor color;
+    color.flags= DoRed | DoGreen | DoBlue; 
+    color.red = red * 257;
+    color.green = green * 257;
+    color.blue = blue * 257;
+    XAllocColor(gr->display, gr->colormap, &color);
+    XSetForeground(gr->display, gr->gc, color.pixel);
+}
+
+void ui_draw_line(UiGraphics *g, int x1, int y1, int x2, int y2) {
+    UiXlibGraphics *gr = (UiXlibGraphics*)g;
+    XDrawLine(gr->display, XtWindow(gr->widget), gr->gc, x1, y1, x2, y2);
+}
+
+void ui_draw_rect(UiGraphics *g, int x, int y, int w, int h, int fill) {
+    UiXlibGraphics *gr = (UiXlibGraphics*)g;
+    if(fill) {
+        XFillRectangle(gr->display, XtWindow(gr->widget), gr->gc, x, y, w, h);
+    } else {
+        XDrawRectangle(gr->display, XtWindow(gr->widget), gr->gc, x, y, w, h);
+    }
+}
+
+void ui_draw_text(UiGraphics *g, int x, int y, UiTextLayout *text) {
+    UiXlibGraphics *gr = (UiXlibGraphics*)g;
+    int width, height;
+    ui_text_getsize(text, &width, &height);
+    if(text->maxwidth > 0) {
+        XRectangle clip;
+        clip.x = x;
+        clip.y = y;
+        clip.width = text->maxwidth;
+        clip.height = height;
+        XSetClipRectangles(gr->display, gr->gc, 0, 0, &clip, 1, Unsorted);
+    }
+    
+    XmbDrawString(
+            gr->display,
+            XtWindow(gr->widget),
+            text->fontset,
+            gr->gc,
+            x,
+            y + height,
+            text->text,
+            text->length);
+    
+    XSetClipMask(gr->display, gr->gc, None);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/graphics.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,78 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2012 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GRAPHICS_H
+#define	GRAPHICS_H
+
+#include "../ui/graphics.h"
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiXlibGraphics {
+    UiGraphics g;
+    Display    *display;
+    Widget     widget;
+    Colormap   colormap;
+    GC         gc;
+} UiXlibGraphics;
+
+typedef struct UiDrawEvent {
+    ui_drawfunc    callback;
+    UiObject       *obj;
+    void           *userdata;
+    UiXlibGraphics gr;
+} UiDrawEvent;
+
+typedef struct UiMouseEventData {
+    UiObject    *obj;
+    ui_callback callback;
+    void        *userdata;
+    Time        last_event;
+} UiMouseEventData;
+
+struct UiTextLayout {
+    char     *text;
+    size_t   length;
+    Widget   widget;
+    XFontSet fontset;
+    int      maxwidth;
+    int      width;
+    int      height;
+    int      changed;
+};
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* GRAPHICS_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/image.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,40 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+#include "image.h"
+
+UiIcon* ui_icon(const char *name, int size) {
+    
+}
+
+UiIcon* ui_icon_unscaled(const char *name, int size) {
+    
+}
+
+void ui_free_icon(UiIcon *icon) {
+    
+}
+
+UiImage* ui_icon_image(UiIcon *icon) {
+    
+}
+
+UiImage* ui_image(const char *filename) {
+    
+}
+
+UiImage* ui_named_image(const char *filename, const char *name) {
+    
+}
+
+UiImage* ui_load_image_from_path(const char *path, const char *name) {
+    
+}
+
+void ui_free_image(UiImage *img) {
+    
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/image.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,31 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/* 
+ * File:   image.h
+ * Author: olaf
+ *
+ * Created on 1. Juli 2018, 19:01
+ */
+
+#ifndef IMAGE_H
+#define IMAGE_H
+
+#include "../ui/image.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* IMAGE_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/label.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,70 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "label.h"
+#include "container.h"
+#include "../common/context.h"
+#include "../common/object.h"
+#include <ucx/mempool.h>
+
+UIWIDGET ui_label(UiObject *obj, char *label) {
+    UiContainer *ct = uic_get_current_container(obj);
+    XmString str = XmStringCreateLocalized(label);
+    
+    int n = 0;
+    Arg args[16]; 
+    XtSetArg(args[n], XmNlabelString, str);
+    n++;
+    
+    Widget parent = ct->prepare(ct, args, &n, FALSE);
+    Widget widget = XmCreateLabel(parent, "label", args, n);
+    ct->add(ct, widget);  
+    XtManageChild(widget);
+    
+    return widget;
+}
+
+UIWIDGET ui_space(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    XmString str = XmStringCreateLocalized("");
+    
+    int n = 0;
+    Arg args[16]; 
+    XtSetArg(args[n], XmNlabelString, str);
+    n++;
+    
+    Widget parent = ct->prepare(ct, args, &n, TRUE);
+    Widget widget = XmCreateLabel(parent, "space_label", args, n);
+    ct->add(ct, widget);  
+    XtManageChild(widget);
+    
+    return widget;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/label.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,44 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef LABEL_H
+#define	LABEL_H
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* LABEL_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/list.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,207 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "container.h"
+
+#include "list.h"
+#include "../common/object.h"
+
+
+void* ui_strmodel_getvalue(void *elm, int column) {
+    return column == 0 ? elm : NULL;
+}
+
+
+UIWIDGET ui_listview_str(UiObject *obj, UiList *list, ui_callback f, void *udata) {
+    return ui_listview(obj, list, ui_strmodel_getvalue, f, udata);
+}
+
+UIWIDGET ui_listview_var(UiObject *obj, UiVar *var, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
+    int count;
+    XmStringTable items = ui_create_stringlist(var->value, getvalue, &count);
+    
+    Arg args[8];
+    int n = 0;
+    XtSetArg(args[n], XmNitemCount, count);
+    n++;
+    XtSetArg(args[n], XmNitems, count == 0 ? NULL : items);
+    n++;
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    Widget parent = ct->prepare(ct, args, &n, TRUE);
+    Widget widget = XmCreateScrolledList(parent, "listview", args, n);
+    ct->add(ct, XtParent(widget));
+    XtManageChild(widget);
+    
+    UiListView *listview = ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiListView));
+    listview->widget = widget;
+    listview->list = var;
+    listview->getvalue = getvalue;
+    
+    for (int i=0;i<count;i++) {
+        XmStringFree(items[i]);
+    }
+    XtFree((char *)items);
+    
+    if(f) {
+        UiListViewEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiListViewEventData));
+        event->event.obj = obj;
+        event->event.userdata = udata;
+        event->event.callback = f;
+        event->event.value = 0;
+        event->var = var;
+        XtAddCallback(
+                widget,
+                XmNdefaultActionCallback,
+                (XtCallbackProc)ui_list_selection_callback,
+                event);
+    }
+    
+    return widget;
+}
+
+UIWIDGET ui_listview(UiObject *obj, UiList *list, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = list;
+    var->type = UI_VAR_SPECIAL;
+    return ui_listview_var(obj, var, getvalue, f, udata);
+}
+
+UIWIDGET ui_listview_nv(UiObject *obj, char *varname, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_LIST);
+    if(var) {
+        UiListVar *value = var->value;
+        return ui_listview_var(obj, var, getvalue, f, udata);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+
+XmStringTable ui_create_stringlist(UiList *list, ui_getvaluefunc getvalue, int *count) { 
+    int num = list->count(list);
+    XmStringTable items = (XmStringTable)XtMalloc(num * sizeof(XmString));
+    void *data = list->first(list);
+    for(int i=0;i<num;i++) {
+        items[i] = XmStringCreateLocalized(getvalue(data, 0));
+        data = list->next(list);
+    }
+    
+    *count = num;
+    return items;
+}
+
+
+void ui_listview_update(UiEvent *event, UiListView *view) {
+    int count;
+    XmStringTable items = ui_create_stringlist(
+            view->list->value,
+            view->getvalue,
+            &count);
+    
+    XtVaSetValues(
+            view->widget,
+            XmNitems, count == 0 ? NULL : items,
+            XmNitemCount,
+            count,
+            NULL);
+    
+    for (int i=0;i<count;i++) {
+        XmStringFree(items[i]);
+    }
+    XtFree((char *)items);
+}
+
+void ui_list_selection_callback (Widget widget, UiListViewEventData *event, XtPointer data) {
+    XmListCallbackStruct *cbs = (XmListCallbackStruct *)data;
+    
+    UiEvent e;
+    e.obj = event->event.obj;
+    e.window = event->event.obj->window;
+    e.document = event->event.obj->ctx->document;
+    UiList *list = event->var->value;
+    e.eventdata = list->get(list, cbs->item_position - 1);
+    e.intval = cbs->item_position - 1;
+    event->event.callback(&e, event->event.userdata);
+}
+
+
+/* --------------------------- ComboBox ---------------------------  */
+
+UIWIDGET ui_combobox_str(UiObject *obj, UiList *list, ui_callback f, void *udata) {
+    return ui_combobox(obj, list, ui_strmodel_getvalue, f, udata);
+}
+
+UIWIDGET ui_combobox(UiObject *obj, UiList *list, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = list;
+    var->type = UI_VAR_SPECIAL;
+    return ui_combobox_var(obj, var, getvalue, f, udata);
+}
+
+UIWIDGET ui_combobox_nv(UiObject *obj, char *varname, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_LIST);
+    if(var) {
+        UiListVar *value = var->value;
+        return ui_combobox_var(obj, var, getvalue, f, udata);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+UIWIDGET ui_combobox_var(UiObject *obj, UiVar *var, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
+    UiListView *listview = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiListView));
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    Arg args[16];
+    int n = 0;
+    XtSetArg(args[n], XmNindicatorOn, XmINDICATOR_NONE);
+    n++;
+    XtSetArg(args[n], XmNtraversalOn, FALSE);
+    n++;
+    XtSetArg(args[n], XmNwidth, 160);
+    n++;
+    Widget parent = ct->prepare(ct, args, &n, FALSE);
+    Widget combobox = XmCreateDropDownList(parent, "combobox", args, n);
+    XtManageChild(combobox);
+    listview->widget = combobox;
+    listview->list = var;
+    listview->getvalue = getvalue;
+    
+    ui_listview_update(NULL, listview);
+    
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/list.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,64 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef LIST_H
+#define	LIST_H
+
+#include "toolkit.h"
+#include "../ui/tree.h"
+#include "../common/context.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiListView {
+    Widget          widget;
+    UiVar           *list;
+    ui_getvaluefunc getvalue;
+} UiListView;
+
+typedef struct UiListViewEventData {
+    UiEventData event;
+    UiVar *var;
+} UiListViewEventData;
+
+void* ui_strmodel_getvalue(void *elm, int column);
+
+XmStringTable ui_create_stringlist(UiList *list, ui_getvaluefunc getvalue, int *count);
+void ui_listview_update(UiEvent *event, UiListView *view);
+void ui_list_selection_callback (Widget widget, UiListViewEventData *event, XtPointer data);
+
+UIWIDGET ui_combobox_var(UiObject *obj, UiVar *var, ui_getvaluefunc getvalue, ui_callback f, void *udata);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* LIST_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/menu.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,626 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+#include "menu.h"
+#include "button.h"
+#include "toolkit.h"
+#include "stock.h"
+#include "container.h"
+#include "../common/context.h"
+#include "../ui/window.h"
+
+UcxList *menus;
+UcxList *current;
+
+void ui_menu(char *label) {
+    // free current menu hierarchy
+    ucx_list_free(current);
+    
+    // create menu
+    UiMenu *menu = malloc(sizeof(UiMenu));
+    menu->item.add_to = (ui_menu_add_f)add_menu_widget;
+    
+    menu->label  = label;
+    menu->items  = NULL;
+    menu->parent = NULL;    
+    
+    current = ucx_list_prepend(NULL, menu);
+    menus = ucx_list_append(menus, menu);
+    
+}
+
+void ui_submenu(char *label) {
+    UiMenu *menu = malloc(sizeof(UiMenu));
+    menu->item.add_to = (ui_menu_add_f)add_menu_widget;
+    
+    menu->label  = label;
+    menu->items  = NULL;
+    menu->parent = NULL;
+    
+    // add submenu to current menu
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, menu);
+    
+    // set the submenu to current menu
+    current = ucx_list_prepend(current, menu);
+}
+
+void ui_submenu_end() {
+    if(ucx_list_size(current) < 2) {
+        return;
+    }
+    current = ucx_list_remove(current, current);
+}
+
+void ui_menuitem(char *label, ui_callback f, void *userdata) {
+    ui_menuitem_gr(label, f, userdata, -1);
+}
+
+void ui_menuitem_st(char *stockid, ui_callback f, void *userdata) {
+    ui_menuitem_stgr(stockid, f, userdata, -1);
+}
+
+void ui_menuitem_gr(char *label, ui_callback f, void *userdata, ...) {
+    if(!current) {
+        return;
+    }
+    
+    UiMenuItem *item = malloc(sizeof(UiMenuItem));
+    item->item.add_to = (ui_menu_add_f)add_menuitem_widget;
+    
+    item->label = label;
+    item->userdata = userdata;
+    item->callback = f;
+    item->groups = NULL;
+    
+    // add groups
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->groups = ucx_list_append(item->groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, item);
+}
+
+void ui_menuitem_stgr(char *stockid, ui_callback f, void *userdata, ...) {
+    if(!current) {
+        return;
+    }
+    
+    UiStMenuItem *item = malloc(sizeof(UiStMenuItem));
+    item->item.add_to = (ui_menu_add_f)add_menuitem_st_widget;
+    
+    item->stockid = stockid;
+    item->userdata = userdata;
+    item->callback = f;
+    item->groups = NULL;
+    
+    // add groups
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->groups = ucx_list_append(item->groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, item);
+}
+
+void ui_menuseparator() {
+    if(!current) {
+        return;
+    }
+    
+    UiMenuItemI *item = malloc(sizeof(UiMenuItemI));
+    item->add_to = (ui_menu_add_f)add_menuseparator_widget;
+    
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, item);
+}
+
+
+void ui_checkitem(char *label, ui_callback f, void *userdata) {
+    if(!current) {
+        return;
+    }
+    
+    UiCheckItem *item = malloc(sizeof(UiCheckItem));
+    item->item.add_to = (ui_menu_add_f)add_checkitem_widget;
+    item->label = label;
+    item->callback = f;
+    item->userdata = userdata;
+    
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, item);
+}
+
+void ui_checkitem_nv(char *label, char *vname) {
+    if(!current) {
+        return;
+    }
+    
+    UiCheckItemNV *item = malloc(sizeof(UiCheckItemNV));
+    item->item.add_to = (ui_menu_add_f)add_checkitemnv_widget;
+    item->varname = vname;
+    item->label = label;
+    
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, item);
+}
+
+void ui_menuitem_list(UiList *items, ui_callback f, void *userdata) {
+    if(!current) {
+        return;
+    }
+    
+    UiMenuItemList *item = malloc(sizeof(UiMenuItemList));
+    item->item.add_to = (ui_menu_add_f)add_menuitem_list_widget;
+    item->callback = f;
+    item->userdata = userdata;
+    item->list = items;
+    
+    UiMenu *cm = current->data;
+    cm->items = ucx_list_append(cm->items, item);
+}
+
+
+// private menu functions
+void ui_create_menubar(UiObject *obj) {
+    if(!menus) {
+        return;
+    }
+    
+    Widget menubar = XmCreateMenuBar(obj->widget, "main_list", NULL, 0);
+    XtManageChild(menubar);
+    
+    UcxList *ls = menus;
+    int menu_index = 0;
+    while(ls) {
+        UiMenu *menu = ls->data;
+        menu_index += menu->item.add_to(menubar, menu_index, &menu->item, obj);
+        
+        ls = ls->next;
+    }
+}
+
+int add_menu_widget(Widget parent, int i, UiMenuItemI *item, UiObject *obj) {
+    UiMenu *menu = (UiMenu*)item;
+    
+    Widget menuItem = XtVaCreateManagedWidget(
+            menu->label,
+            xmCascadeButtonWidgetClass,
+            parent,
+            NULL);
+    Widget m = XmVaCreateSimplePulldownMenu(parent, menu->label, i, NULL, NULL);
+    
+    UcxList *ls = menu->items;
+    int menu_index = 0;
+    while(ls) {
+        UiMenuItemI *mi = ls->data;
+        menu_index += mi->add_to(m, menu_index, mi, obj);
+        ls = ls->next;
+    }
+    
+    return 1;
+}
+
+int add_menuitem_widget(
+        Widget parent,
+        int i,
+        UiMenuItemI *item,
+        UiObject *obj)
+{
+    UiMenuItem *mi = (UiMenuItem*)item;
+    
+    Arg args[1];
+    XmString label = XmStringCreateLocalized(mi->label);
+    XtSetArg(args[0], XmNlabelString, label);
+    
+    Widget mitem = XtCreateManagedWidget(
+            "menubutton",
+            xmPushButtonWidgetClass,
+            parent,
+            args,
+            1);
+    XmStringFree(label);
+    
+    if(mi->callback != NULL) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = mi->userdata;
+        event->callback = mi->callback;
+        event->value = 0;
+        XtAddCallback(
+                mitem,
+                XmNactivateCallback,
+                (XtCallbackProc)ui_push_button_callback,
+                event);
+    }
+    
+    if(mi->groups) {
+        uic_add_group_widget(obj->ctx, mitem, mi->groups);
+    }
+    
+    return 1;
+}
+
+int add_menuitem_st_widget(Widget parent, int i, UiMenuItemI *item, UiObject *obj) {
+    UiStMenuItem *mi = (UiStMenuItem*)item;
+    
+    UiStockItem *si = ui_get_stock_item(mi->stockid);
+    if(!si) {
+        fprintf(stderr, "UI Error: unknown stock id: %s\n", mi->stockid);
+        return 0;
+    }
+    
+    int n = 0;
+    Arg args[4];
+    XmString label = XmStringCreateLocalized(si->label);
+    XmString at = NULL;
+    
+    XtSetArg(args[n], XmNlabelString, label);
+    n++;
+    if(si->accelerator) {
+        XtSetArg(args[n], XmNaccelerator, si->accelerator);
+        n++;
+    }
+    if(si->accelerator_label) {
+        at = XmStringCreateLocalized(si->accelerator_label);
+        XtSetArg(args[n], XmNacceleratorText, at);
+        n++;
+    }
+    
+    Widget mitem = XtCreateManagedWidget(
+            "menubutton",
+            xmPushButtonWidgetClass,
+            parent,
+            args,
+            n);
+    XmStringFree(label);
+    if(at) {
+        XmStringFree(at);
+    }
+    
+    if(mi->callback != NULL) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = mi->userdata;
+        event->callback = mi->callback;
+        event->value = 0;
+        XtAddCallback(
+                mitem,
+                XmNactivateCallback,
+                (XtCallbackProc)ui_push_button_callback,
+                event);
+    }
+    
+    if(mi->groups) {
+        uic_add_group_widget(obj->ctx, mitem, mi->groups);
+    }
+    
+    return 1;
+}
+
+int add_menuseparator_widget(
+        Widget parent,
+        int i,
+        UiMenuItemI *item,
+        UiObject *obj)
+{
+    Widget s = XmCreateSeparatorGadget (parent, "menu_separator", NULL, 0);
+    XtManageChild(s);
+    return 1;
+}
+
+int add_checkitem_widget(
+        Widget parent,
+        int i,
+        UiMenuItemI *item,
+        UiObject *obj)
+{
+    UiCheckItem *ci = (UiCheckItem*)item;
+    
+    Arg args[3];
+    XmString label = XmStringCreateLocalized(ci->label);
+    XtSetArg(args[0], XmNlabelString, label);
+    XtSetArg(args[1], XmNvisibleWhenOff, 1);
+    Widget checkbox = XtCreateManagedWidget(
+            "menutogglebutton",
+            xmToggleButtonWidgetClass,
+            parent,
+            args,
+            2);
+    XmStringFree(label);
+    
+    if(ci->callback) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = ci->userdata;
+        event->callback = ci->callback;
+        XtAddCallback(
+            checkbox,
+            XmNvalueChangedCallback,
+            (XtCallbackProc)ui_toggle_button_callback,
+            event);
+    }
+    
+    return 1;
+}
+
+int add_checkitemnv_widget(
+        Widget parent,
+        int i,
+        UiMenuItemI *item,
+        UiObject *obj)
+{
+    UiCheckItemNV *ci = (UiCheckItemNV*)item;
+    
+    Arg args[3];
+    XmString label = XmStringCreateLocalized(ci->label);
+    XtSetArg(args[0], XmNlabelString, label);
+    XtSetArg(args[1], XmNvisibleWhenOff, 1);
+    Widget checkbox = XtCreateManagedWidget(
+            "menutogglebutton",
+            xmToggleButtonWidgetClass,
+            parent,
+            args,
+            2);
+    XmStringFree(label);
+    
+    UiVar *var = uic_create_var(obj->ctx, ci->varname, UI_VAR_INTEGER);
+    if(var) {
+        UiInteger *value = var->value;
+        value->obj = checkbox;
+        value->get = ui_toggle_button_get;
+        value->set = ui_toggle_button_set;
+        value = 0;
+    } else {
+        // TODO: error
+    }
+    
+    return 1;
+}
+
+int add_menuitem_list_widget(
+        Widget parent,
+        int i,
+        UiMenuItemI *item,
+        UiObject *obj)
+{
+    UiMenuItemList *il = (UiMenuItemList*)item;
+    UcxMempool *mp = obj->ctx->mempool;
+    
+    UiActiveMenuItemList *ls = ucx_mempool_malloc(
+            mp,
+            sizeof(UiActiveMenuItemList));
+    
+    ls->object = obj;
+    ls->menu = parent;
+    ls->index = i;
+    ls->oldcount = 0;
+    ls->list = il->list;
+    ls->callback = il->callback;
+    ls->userdata = il->userdata;
+    
+    ls->list->observers = ui_add_observer(
+            ls->list->observers,
+            (ui_callback)ui_update_menuitem_list,
+            ls);
+    
+    ui_update_menuitem_list(NULL, ls);
+    
+    return 0;
+}
+
+void ui_update_menuitem_list(UiEvent *event, UiActiveMenuItemList *list) {
+    Arg args[4];
+    
+    // remove old items
+    if(list->oldcount > 0) {
+        Widget *children;
+        int nc;
+        
+        XtVaGetValues(
+                list->menu,
+                XmNchildren,
+                &children,
+                XmNnumChildren,
+                &nc,
+                NULL);
+        
+        for(int i=0;i<list->oldcount;i++) {
+            XtDestroyWidget(children[list->index + i]);
+        }
+    }
+    
+    char *str = ui_list_first(list->list);
+    if(str) {
+        // add separator
+        XtSetArg(args[0], XmNpositionIndex, list->index);
+        Widget s = XmCreateSeparatorGadget (list->menu, "menu_separator", args, 1);
+        XtManageChild(s);
+    }
+    int i = 1;
+    while(str) {
+        XmString label = XmStringCreateLocalized(str);
+        XtSetArg(args[0], XmNlabelString, label);
+        XtSetArg(args[1], XmNpositionIndex, list->index + i);
+
+        Widget mitem = XtCreateManagedWidget(
+                "menubutton",
+                xmPushButtonWidgetClass,
+                list->menu,
+                args,
+                2);
+        XmStringFree(label);
+        
+        if(list->callback) {
+            // TODO: use mempool
+            UiEventData *event = malloc(sizeof(UiEventData));
+            event->obj = list->object;
+            event->userdata = list->userdata;
+            event->callback = list->callback;
+            event->value = i - 1;
+
+            XtAddCallback(
+                mitem,
+                XmNactivateCallback,
+                (XtCallbackProc)ui_push_button_callback,
+                event);
+        }
+        
+        str = ui_list_next(list->list);
+        i++;
+    }
+    
+    list->oldcount = i;
+}
+
+void ui_menu_event_wrapper(Widget widget, XtPointer udata, XtPointer cdata) {
+    UiEventData *event = udata;
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.intval = 0;
+    event->callback(&e, event->userdata);    
+}
+
+
+/*
+ * widget menu functions
+ */
+
+static void ui_popup_handler(Widget widget, XtPointer data,  XEvent *event, Boolean *c) {
+    Widget menu = data;
+    XmMenuPosition(menu, (XButtonPressedEvent *)event);
+    XtManageChild(menu);
+    
+    *c = FALSE;
+}
+
+UIMENU ui_contextmenu(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    if(ct->current) {
+        return ui_contextmenu_w(obj, ct->current);
+    } else {
+        return NULL; // TODO: warn
+    }
+}
+
+UIMENU ui_contextmenu_w(UiObject *obj, UIWIDGET widget) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    Widget menu = XmCreatePopupMenu(widget, "popup_menu", NULL, 0);
+    ct->menu = menu;
+    
+    XtAddEventHandler(widget, ButtonPressMask, FALSE, ui_popup_handler, menu);
+    
+    return menu;
+}
+
+void ui_contextmenu_popup(UIMENU menu) {
+    
+}
+
+void ui_widget_menuitem(UiObject *obj, char *label, ui_callback f, void *userdata) {
+    ui_widget_menuitem_gr(obj, label, f, userdata, -1);
+}
+
+void ui_widget_menuitem_gr(UiObject *obj, char *label, ui_callback f, void *userdata, ...) {
+    UiContainer *ct = uic_get_current_container(obj);
+    if(!ct->menu) {
+        return;
+    }
+    
+    // add groups
+    UcxList *groups = NULL;
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        ucx_list_append(groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    // create menuitem
+    Arg args[4];
+    XmString labelstr = XmStringCreateLocalized(label);
+    XtSetArg(args[0], XmNlabelString, labelstr);
+    
+    Widget item = XmCreatePushButton(ct->menu, "menu_button", args, 1);
+    XtManageChild(item);
+    XmStringFree(labelstr);
+}
+
+void ui_widget_menuitem_st(UiObject *obj, char *stockid, ui_callback f, void *userdata) {
+    ui_widget_menuitem_stgr(obj, stockid, f, userdata, -1);
+}
+
+void ui_widget_menuitem_stgr(UiObject *obj, char *stockid, ui_callback f, void *userdata, ...) {
+    UiContainer *ct = uic_get_current_container(obj);
+    if(!ct->menu) {
+        return;
+    }
+    
+    // add groups
+    UcxList *groups = NULL;
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        ucx_list_append(groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    // create menuitem
+    UiStockItem *stockItem = ui_get_stock_item(stockid);
+    Arg args[4];
+    XmString labelstr = XmStringCreateLocalized(stockItem->label);
+    XtSetArg(args[0], XmNlabelString, labelstr);
+    
+    Widget item = XmCreatePushButton(ct->menu, "menu_button", args, 1);
+    XtManageChild(item);
+    XmStringFree(labelstr);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/menu.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,127 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef MENU_H
+#define	MENU_H
+
+#include "../ui/menu.h"
+#include <ucx/list.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiMenuItemI      UiMenuItemI;
+typedef struct UiMenu           UiMenu;
+typedef struct UiMenuItem       UiMenuItem;
+typedef struct UiStMenuItem     UiStMenuItem;
+typedef struct UiCheckItem      UiCheckItem;
+typedef struct UiCheckItemNV    UiCheckItemNV;
+typedef struct UiMenuItemList   UiMenuItemList;
+
+typedef struct UiActiveMenuItemList UiActiveMenuItemList;
+
+typedef int(*ui_menu_add_f)(Widget, int, UiMenuItemI*, UiObject*);
+    
+struct UiMenuItemI {
+    ui_menu_add_f  add_to;
+};
+
+struct UiMenu {
+    UiMenuItemI    item;
+    char           *label;
+    UcxList        *items;
+    UiMenu         *parent;
+};
+
+struct UiMenuItem {
+    UiMenuItemI    item;
+    ui_callback    callback;
+    char           *label;
+    void           *userdata;
+    UcxList        *groups;
+};
+
+struct UiStMenuItem {
+    UiMenuItemI    item;
+    ui_callback    callback;
+    char           *stockid;
+    void           *userdata;
+    UcxList        *groups;
+};
+
+struct UiCheckItem {
+    UiMenuItemI    item;
+    char           *label;
+    ui_callback    callback;
+    void           *userdata;
+};
+
+struct UiCheckItemNV {
+    UiMenuItemI    item;
+    char           *label;
+    char           *varname;
+};
+
+struct UiMenuItemList {
+    UiMenuItemI    item;
+    ui_callback    callback;
+    void           *userdata;
+    UiList         *list;
+};
+
+struct UiActiveMenuItemList {
+    UiObject     *object;
+    Widget       menu;
+    int          index;
+    int          oldcount;
+    UiList       *list;
+    ui_callback  callback;
+    void         *userdata;
+};
+
+void ui_create_menubar(UiObject *obj);
+
+int add_menu_widget(Widget parent, int i, UiMenuItemI *item, UiObject *obj);
+int add_menuitem_widget(Widget parent, int i, UiMenuItemI *item, UiObject *obj);
+int add_menuitem_st_widget(Widget parent, int i, UiMenuItemI *item, UiObject *obj);
+int add_menuseparator_widget(Widget parent, int i, UiMenuItemI *item, UiObject *obj);
+int add_checkitem_widget(Widget parent, int i, UiMenuItemI *item, UiObject *obj);
+int add_checkitemnv_widget(Widget parent, int i, UiMenuItemI *item, UiObject *obj);
+int add_menuitem_list_widget(Widget parent, int i, UiMenuItemI *item, UiObject *obj);
+
+void ui_update_menuitem_list(UiEvent *event, UiActiveMenuItemList *list);
+void ui_menu_event_wrapper(Widget widget, XtPointer udata, XtPointer cdata);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* MENU_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/objs.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,49 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2012 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+MOTIF_SRC_DIR = ui/motif/
+MOTIF_OBJPRE = $(OBJ_DIR)$(MOTIF_SRC_DIR)
+
+MOTIFOBJ = toolkit.o
+MOTIFOBJ += stock.o
+MOTIFOBJ += window.o
+MOTIFOBJ += container.o
+MOTIFOBJ += menu.o
+MOTIFOBJ += toolbar.o
+MOTIFOBJ += button.o
+MOTIFOBJ += label.o
+MOTIFOBJ += text.o
+MOTIFOBJ += list.o
+MOTIFOBJ += tree.o
+MOTIFOBJ += graphics.o
+MOTIFOBJ += range.o
+MOTIFOBJ += dnd.o
+MOTIFOBJ += image.o
+
+TOOLKITOBJS += $(MOTIFOBJ:%=$(MOTIF_OBJPRE)%)
+TOOLKITSOURCE += $(MOTIFOBJ:%.o=motif/%.c)
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/range.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,138 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2016 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "range.h"
+#include "container.h"
+#include <ucx/mempool.h>
+#include "../common/context.h"
+#include "../common/object.h"
+
+
+static UIWIDGET ui_scrollbar(UiObject *obj, UiOrientation orientation, UiRange *range, ui_callback f, void *userdata) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    int n = 0;
+    Arg args[16];
+    XtSetArg(args[n], XmNorientation, orientation == UI_HORIZONTAL ? XmHORIZONTAL : XmVERTICAL);
+    n++;
+    XtSetArg (args[n], XmNmaximum, 10);
+    n++;
+    XtSetArg (args[n], XmNsliderSize, 1);
+    n++;
+    Widget parent = ct->prepare(ct, args, &n, FALSE);
+    Widget scrollbar = XmCreateScrollBar(parent, "scrollbar", args, n);
+    XtManageChild(scrollbar);
+    ct->add(ct, scrollbar);
+    
+    if(range) {
+        range->get = ui_scrollbar_get;
+        range->set = ui_scrollbar_set;
+        range->setrange = ui_scrollbar_setrange;
+        range->setextent = ui_scrollbar_setextent;
+        range->obj = scrollbar;
+    }
+    
+    if(f) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = userdata;
+        event->callback = f;
+        event->value = 0;
+        XtAddCallback(
+                scrollbar,
+                XmNvalueChangedCallback,
+                (XtCallbackProc)ui_scrollbar_callback,
+                event);
+    }
+    
+    return scrollbar;
+}
+
+UIWIDGET ui_hscrollbar(UiObject *obj, UiRange *range, ui_callback f, void *userdata) {
+    return ui_scrollbar(obj, UI_HORIZONTAL, range, f, userdata);
+}
+
+UIWIDGET ui_vscrollbar(UiObject *obj, UiRange *range, ui_callback f, void *userdata) {
+    return ui_scrollbar(obj, UI_VERTICAL, range, f, userdata);
+}
+
+void ui_scrollbar_callback(Widget scrollbar, UiEventData *event, XtPointer cdata) {
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.intval = event->value;
+    event->callback(&e, event->userdata);
+}
+
+double ui_scrollbar_get(UiRange *range) {
+    int intval;
+    XtVaGetValues(
+            range->obj,
+            XmNvalue,
+            &intval,
+            NULL);
+    double value = (double)intval / 10;
+    range->value = value;
+    return value;
+}
+
+void   ui_scrollbar_set(UiRange *range, double value) {
+    XtVaSetValues(
+            range->obj,
+            XmNvalue,
+            (int)(value * 10),
+            NULL);
+    range->value = value;
+}
+
+void   ui_scrollbar_setrange(UiRange *range, double min, double max) {
+    XtVaSetValues(
+            range->obj,
+            XmNminimum,
+            (int)(min * 10),
+            XmNmaximum,
+            (int)(max * 10),
+            NULL);
+    range->min = min;
+    range->max = max;
+}
+
+void   ui_scrollbar_setextent(UiRange *range, double extent) {
+    XtVaSetValues(
+            range->obj,
+            XmNsliderSize,
+            (int)(extent * 10),
+            NULL);
+    range->extent = extent;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/range.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,51 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2016 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef RANGE_H
+#define RANGE_H
+
+#include "toolkit.h"
+#include "../ui/range.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void ui_scrollbar_callback(Widget scrollbar, UiEventData *event, XtPointer cdata);
+double ui_scrollbar_get(UiRange *range);
+void   ui_scrollbar_set(UiRange *range, double value);
+void   ui_scrollbar_setrange(UiRange *range, double min, double max);
+void   ui_scrollbar_setextent(UiRange *range, double extent);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RANGE_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/stock.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,76 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "stock.h"
+#include "../ui/properties.h"
+#include <ucx/map.h>
+
+static UcxMap *stock_items;
+
+void ui_stock_init() {
+    stock_items = ucx_map_new(64);
+    
+    ui_add_stock_item(UI_STOCK_NEW, "New", "Ctrl<Key>N", "Ctrl+N", NULL);
+    ui_add_stock_item(UI_STOCK_OPEN, "Open", "Ctrl<Key>O", "Ctrl+O", NULL);
+    ui_add_stock_item(UI_STOCK_SAVE, "Save", "Ctrl<Key>S", "Ctrl+S", NULL);
+    ui_add_stock_item(UI_STOCK_SAVE_AS, "Save as ...", NULL, NULL, NULL);
+    ui_add_stock_item(UI_STOCK_REVERT_TO_SAVED, "Revert to saved", NULL, NULL, NULL);
+    ui_add_stock_item(UI_STOCK_CLOSE, "Close", "Ctrl<Key>W", "Ctrl+W", NULL);
+    ui_add_stock_item(UI_STOCK_UNDO, "Undo", "Ctrl<Key>Z", "Ctrl+Z", NULL);
+    ui_add_stock_item(UI_STOCK_REDO, "Redo", NULL, NULL, NULL);
+    ui_add_stock_item(UI_STOCK_GO_BACK, "Back", NULL, NULL, NULL);
+    ui_add_stock_item(UI_STOCK_GO_FORWARD, "Forward", NULL, NULL, NULL);
+    ui_add_stock_item(UI_STOCK_CUT, "Cut", "Ctrl<Key>X", "Ctrl+X", NULL);
+    ui_add_stock_item(UI_STOCK_COPY, "Copy", "Ctrl<Key>C", "Ctrl+C", NULL);
+    ui_add_stock_item(UI_STOCK_PASTE, "Paste", "Ctrl<Key>V", "Ctrl+V", NULL);
+    ui_add_stock_item(UI_STOCK_DELETE, "Delete", NULL, NULL, NULL);
+}
+
+void ui_add_stock_item(char *id, char *label, char *accelerator, char *accelerator_label, void *icon) {
+    UiStockItem *i = malloc(sizeof(UiStockItem));
+    i->label = label;
+    i->accelerator = accelerator;
+    i->accelerator_label = accelerator_label;
+    // TODO: icon
+    
+    ucx_map_cstr_put(stock_items, id, i);
+}
+
+UiStockItem* ui_get_stock_item(char *id) {
+    UiStockItem *item = ucx_map_cstr_get(stock_items, id);
+    if(item) {
+        char *label = uistr_n(id);
+        if(label) {
+            item->label = label;
+        }
+    }
+    return item;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/stock.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,56 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef STOCK_H
+#define	STOCK_H
+
+#include "../ui/stock.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiStockItem {
+    char *label;
+    char *accelerator;
+    char *accelerator_label;
+    // TODO: icon
+} UiStockItem;
+    
+void ui_stock_init();
+
+void ui_add_stock_item(char *id, char *label, char *accelerator, char *accelerator_label, void *icon);
+
+UiStockItem* ui_get_stock_item(char *id);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* STOCK_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/text.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,488 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "text.h"
+#include "container.h"
+
+
+UIWIDGET ui_textarea_var(UiObject *obj, UiVar *var) {
+    UiContainer *ct = uic_get_current_container(obj);
+    int n = 0;
+    Arg args[16];
+    
+    //XtSetArg(args[n], XmNeditable, TRUE);
+    //n++;
+    XtSetArg(args[n], XmNeditMode, XmMULTI_LINE_EDIT);
+    n++;
+    
+    Widget parent = ct->prepare(ct, args, &n, TRUE);
+    Widget text_area = XmCreateScrolledText(parent, "text_area", args, n);
+    ct->add(ct, XtParent(text_area));
+    XtManageChild(text_area);
+    
+    UiTextArea *uitext = ucx_mempool_malloc(
+            obj->ctx->mempool,
+            sizeof(UiTextArea));
+    uitext->ctx = obj->ctx;
+    uitext->last_selection_state = 0;
+    XtAddCallback(
+                text_area,
+                XmNmotionVerifyCallback,
+                (XtCallbackProc)ui_text_selection_callback,
+                uitext);
+    
+    // bind value
+    if(var->value) {
+        UiText *value = var->value;
+        if(value->value.ptr) {
+            XmTextSetString(text_area, value->value.ptr);
+            value->value.free(value->value.ptr);
+        }
+        
+        value->set = ui_textarea_set;
+        value->get = ui_textarea_get;
+        value->getsubstr = ui_textarea_getsubstr;
+        value->insert = ui_textarea_insert;
+        value->setposition = ui_textarea_setposition;
+        value->position = ui_textarea_position;
+        value->selection = ui_textarea_selection;
+        value->length = ui_textarea_length;
+        value->value.ptr = NULL;
+        value->obj = text_area;
+        
+        if(!value->undomgr) {
+            value->undomgr = ui_create_undomgr();
+        }
+        
+        XtAddCallback(
+                text_area,
+                XmNmodifyVerifyCallback,
+                (XtCallbackProc)ui_text_modify_callback,
+                var);
+    }
+    
+    return text_area;
+}
+
+UIWIDGET ui_textarea(UiObject *obj, UiText *value) {
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = value;
+    var->type = UI_VAR_SPECIAL;
+    return ui_textarea_var(obj, var);
+}
+
+UIWIDGET ui_textarea_nv(UiObject *obj, char *varname) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_TEXT);
+    if(var) {
+        return ui_textarea_var(obj, var);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+char* ui_textarea_get(UiText *text) {
+    if(text->value.ptr) {
+        text->value.free(text->value.ptr);
+    }
+    char *str = XmTextGetString(text->obj);
+    text->value.ptr = str;
+    text->value.free = (ui_freefunc)XtFree;
+    return str;
+}
+
+void ui_textarea_set(UiText *text, char *str) {
+    XmTextSetString(text->obj, str);
+    if(text->value.ptr) {
+        text->value.free(text->value.ptr);
+    }
+    text->value.ptr = NULL;
+}
+
+char* ui_textarea_getsubstr(UiText *text, int begin, int end) {
+    if(text->value.ptr) {
+        text->value.free(text->value.ptr);
+    }
+    int length = end - begin;
+    char *str = XtMalloc(length + 1);
+    XmTextGetSubstring(text->obj, begin, length, length + 1, str);
+    text->value.ptr = str;
+    text->value.free = (ui_freefunc)XtFree;
+    return str;
+}
+
+void ui_textarea_insert(UiText *text, int pos, char *str) {
+    text->value.ptr = NULL;
+    XmTextInsert(text->obj, pos, str);
+    if(text->value.ptr) {
+        text->value.free(text->value.ptr);
+    }
+}
+
+void ui_textarea_setposition(UiText *text, int pos) {
+    XmTextSetInsertionPosition(text->obj, pos);
+}
+
+int ui_textarea_position(UiText *text) {
+    long begin;
+    long end;
+    XmTextGetSelectionPosition(text->obj, &begin, &end);
+    text->pos = begin;
+    return text->pos;
+}
+
+void ui_textarea_selection(UiText *text, int *begin, int *end) {
+    XmTextGetSelectionPosition(text->obj, (long*)begin, (long*)end);
+}
+
+int ui_textarea_length(UiText *text) {
+    return (int)XmTextGetLastPosition(text->obj);
+}
+
+
+void ui_text_set(UiText *text, char *str) {
+    if(text->set) {
+        text->set(text, str);
+    } else {
+        if(text->value.ptr) {
+            text->value.free(text->value.ptr);
+        }
+        text->value.ptr = XtNewString(str);
+        text->value.free = (ui_freefunc)XtFree;
+    }
+}
+
+char* ui_text_get(UiText *text) {
+    if(text->get) {
+        return text->get(text);
+    } else {
+        return text->value.ptr;
+    }
+}
+
+
+UiUndoMgr* ui_create_undomgr() {
+    UiUndoMgr *mgr = malloc(sizeof(UiUndoMgr));
+    mgr->begin = NULL;
+    mgr->cur = NULL;
+    mgr->length = 0;
+    mgr->event = 1;
+    return mgr;
+}
+
+void ui_text_selection_callback(
+        Widget widget,
+        UiTextArea *textarea,
+        XtPointer data)
+{
+    long left = 0;
+    long right = 0;
+    XmTextGetSelectionPosition(widget, &left, &right);
+    int sel = left < right ? 1 : 0;
+    if(sel != textarea->last_selection_state) {
+        if(sel) {
+            ui_set_group(textarea->ctx, UI_GROUP_SELECTION);
+        } else {
+            ui_unset_group(textarea->ctx, UI_GROUP_SELECTION);
+        }
+    }
+    textarea->last_selection_state = sel;
+}
+
+void ui_text_modify_callback(Widget widget, UiVar *var, XtPointer data) {
+    UiText *value = var->value;
+    if(!value->obj) {
+        // TODO: bug, fix
+        return;
+    }
+    if(!value->undomgr) {
+        value->undomgr = ui_create_undomgr();
+    }
+    
+    XmTextVerifyCallbackStruct *txv = (XmTextVerifyCallbackStruct*)data;
+    int type = txv->text->length > 0 ? UI_TEXTBUF_INSERT : UI_TEXTBUF_DELETE;
+    UiUndoMgr *mgr = value->undomgr;
+    if(!mgr->event) {
+        return;
+    }
+    
+    char *text = txv->text->ptr;
+    int length = txv->text->length;
+    
+    if(mgr->cur) {
+        UcxList *elm = mgr->cur->next;
+        if(elm) {
+            mgr->cur->next = NULL;
+            while(elm) {
+                elm->prev = NULL;   
+                UcxList *next = elm->next;
+                ui_free_textbuf_op(elm->data);
+                free(elm);
+                elm = next;
+            }
+        }
+        
+        if(type == UI_TEXTBUF_INSERT) {
+            UiTextBufOp *last_op = mgr->cur->data;
+            if(
+                last_op->type == UI_TEXTBUF_INSERT &&
+                ui_check_insertstr(last_op->text, last_op->len, text, length) == 0)
+            {
+                // append text to last op
+                int ln = last_op->len;
+                char *newtext = malloc(ln + length + 1);
+                memcpy(newtext, last_op->text, ln);
+                memcpy(newtext+ln, text, length);
+                newtext[ln+length] = '\0';
+                
+                last_op->text = newtext;
+                last_op->len = ln + length;
+                last_op->end += length;
+
+                return;
+            }
+        }
+    }
+    
+    char *str;
+    if(type == UI_TEXTBUF_INSERT) {
+        str = malloc(length + 1);
+        memcpy(str, text, length);
+        str[length] = 0;
+    } else {
+        length = txv->endPos - txv->startPos;
+        str = malloc(length + 1);
+        XmTextGetSubstring(value->obj, txv->startPos, length, length+1, str);
+    }
+    
+    UiTextBufOp *op = malloc(sizeof(UiTextBufOp));
+    op->type = type;
+    op->start = txv->startPos;
+    op->end = txv->endPos + 1;
+    op->len = length;
+    op->text = str;
+    
+    UcxList *elm = ucx_list_append(NULL, op);
+    mgr->cur = elm;
+    mgr->begin = ucx_list_concat(mgr->begin, elm);
+}
+
+int ui_check_insertstr(char *oldstr, int oldlen, char *newstr, int newlen) {
+    // return 1 if oldstr + newstr are one word
+    
+    int has_space = 0;
+    for(int i=0;i<oldlen;i++) {
+        if(oldstr[i] < 33) {
+            has_space = 1;
+            break;
+        }
+    }
+    
+    for(int i=0;i<newlen;i++) {
+        if(has_space && newstr[i] > 32) {
+            return 1;
+        }
+    }
+    
+    return 0;
+}
+
+void ui_free_textbuf_op(UiTextBufOp *op) {
+    if(op->text) {
+        free(op->text);
+    }
+    free(op);
+}
+
+
+void ui_text_undo(UiText *value) {
+    UiUndoMgr *mgr = value->undomgr;
+    
+    if(mgr->cur) {
+        UiTextBufOp *op = mgr->cur->data;
+        mgr->event = 0;
+        switch(op->type) {
+            case UI_TEXTBUF_INSERT: {
+                XmTextReplace(value->obj, op->start, op->end, "");
+                break;
+            }
+            case UI_TEXTBUF_DELETE: {
+                XmTextInsert(value->obj, op->start, op->text);
+                break;
+            }
+        }
+        mgr->event = 1;
+        mgr->cur = mgr->cur->prev;
+    }
+}
+
+void ui_text_redo(UiText *value) {
+    UiUndoMgr *mgr = value->undomgr;
+    
+    UcxList *elm = NULL;
+    if(mgr->cur) {
+        if(mgr->cur->next) {
+            elm = mgr->cur->next;
+        }
+    } else if(mgr->begin) {
+        elm = mgr->begin;
+    }
+    
+    if(elm) {
+        UiTextBufOp *op = elm->data;
+        mgr->event = 0;
+        switch(op->type) {
+            case UI_TEXTBUF_INSERT: {
+                XmTextInsert(value->obj, op->start, op->text);
+                break;
+            }
+            case UI_TEXTBUF_DELETE: {
+                XmTextReplace(value->obj, op->start, op->end, "");
+                break;
+            }
+        }
+        mgr->event = 1;
+        mgr->cur = elm;
+    }
+}
+
+
+/* ------------------------- textfield ------------------------- */
+
+static UIWIDGET create_textfield(UiObject *obj, int width, UiBool frameless, UiBool password, UiString *value) {
+    UiContainer *ct = uic_get_current_container(obj);
+    int n = 0;
+    Arg args[16];
+    XtSetArg(args[n], XmNeditMode, XmSINGLE_LINE_EDIT);
+    n++;
+    if(width > 0) {
+        XtSetArg(args[n], XmNcolumns, width / 2 + 1);
+        n++;
+    }
+    if(frameless) {
+        XtSetArg(args[n], XmNshadowThickness, 0);
+        n++;
+    }
+    if(password) {
+        // TODO
+    }
+    
+    Widget parent = ct->prepare(ct, args, &n, FALSE);
+    Widget textfield = XmCreateText(parent, "text_field", args, n);
+    ct->add(ct, textfield);
+    XtManageChild(textfield);
+    
+    // bind value
+    if(value) {
+        if(value->value.ptr) {
+            XmTextSetString(textfield, value->value.ptr);
+            value->value.free(value->value.ptr);
+        }
+        
+        value->set = ui_textfield_set;
+        value->get = ui_textfield_get;
+        value->value.ptr = NULL;
+        value->obj = textfield;
+    }
+    
+    return textfield;
+}
+
+static UIWIDGET create_textfield_nv(UiObject *obj, int width, UiBool frameless, UiBool password, char *varname) {
+    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_STRING);
+    if(var) {
+        UiString *value = var->value;
+        return ui_textfield(obj, value);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+UIWIDGET ui_textfield(UiObject *obj, UiString *value) {
+    return create_textfield(obj, 0, FALSE, FALSE, value);
+}
+
+UIWIDGET ui_textfield_nv(UiObject *obj, char *varname) {
+    return create_textfield_nv(obj, 0, FALSE, FALSE, varname);
+}
+
+UIWIDGET ui_textfield_w(UiObject *obj, int width, UiString *value) {
+    return create_textfield(obj, width, FALSE, FALSE, value);
+}
+
+UIWIDGET ui_textfield_wnv(UiObject *obj, int width, char *varname) {
+    return create_textfield_nv(obj, width, FALSE, FALSE, varname);
+}
+
+UIWIDGET ui_frameless_textfield(UiObject *obj, UiString *value) {
+    return create_textfield(obj, 0, TRUE, FALSE, value);
+}
+
+UIWIDGET ui_frameless_textfield_nv(UiObject *obj, char *varname) {
+    return create_textfield_nv(obj, 0, TRUE, FALSE, varname);
+}
+
+UIWIDGET ui_passwordfield(UiObject *obj, UiString *value) {
+    return create_textfield(obj, 0, FALSE, TRUE, value);
+}
+
+UIWIDGET ui_passwordfield_nv(UiObject *obj, char *varname) {
+    return create_textfield_nv(obj, 0, FALSE, TRUE, varname);
+}
+
+UIWIDGET ui_passwordfield_w(UiObject *obj, int width, UiString *value) {
+    return create_textfield(obj, width, FALSE, TRUE, value);
+}
+
+UIWIDGET ui_passwordfield_wnv(UiObject *obj, int width, char *varname) {
+    return create_textfield_nv(obj, width, FALSE, TRUE, varname);
+}
+
+
+char* ui_textfield_get(UiString *str) {
+    if(str->value.ptr) {
+        str->value.free(str->value.ptr);
+    }
+    char *value = XmTextGetString(str->obj);
+    str->value.ptr = value;
+    str->value.free = (ui_freefunc)XtFree;
+    return value;
+}
+
+void ui_textfield_set(UiString *str, char *value) {
+    XmTextSetString(str->obj, value);
+    if(str->value.ptr) {
+        str->value.free(str->value.ptr);
+    }
+    str->value.ptr = NULL;
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/text.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,88 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TEXT_H
+#define	TEXT_H
+
+#include "../ui/text.h"
+#include "toolkit.h"
+#include <ucx/list.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#define UI_TEXTBUF_INSERT 0
+#define UI_TEXTBUF_DELETE 1
+typedef struct UiTextBufOp {
+    int  type; // UI_TEXTBUF_INSERT, UI_TEXTBUF_DELETE
+    int  start;
+    int  end;
+    int  len;
+    char *text;
+} UiTextBufOp;
+    
+typedef struct UiUndoMgr {
+    UcxList *begin;
+    UcxList *cur;
+    int     length;
+    int     event;
+} UiUndoMgr;
+
+typedef struct UiTextArea {
+    UiContext *ctx;
+    int last_selection_state;
+} UiTextArea;
+    
+char* ui_textarea_get(UiText *text);
+void ui_textarea_set(UiText *text, char *str);
+char* ui_textarea_getsubstr(UiText *text, int begin, int end);
+void ui_textarea_insert(UiText *text, int pos, char *str);
+void ui_textarea_setposition(UiText *text, int pos);
+int ui_textarea_position(UiText *text);
+void ui_textarea_selection(UiText *text, int *begin, int *end);
+int ui_textarea_length(UiText *text);
+
+UiUndoMgr* ui_create_undomgr();
+void ui_text_selection_callback(
+        Widget widget,
+        UiTextArea *textarea,
+        XtPointer data);
+void ui_text_modify_callback(Widget widget, UiVar *var, XtPointer data);
+int ui_check_insertstr(char *oldstr, int oldlen, char *newstr, int newlen);
+void ui_free_textbuf_op(UiTextBufOp *op);
+
+char* ui_textfield_get(UiString *str);
+void ui_textfield_set(UiString *str, char *value);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* TEXT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/toolbar.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,366 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+
+#include "toolbar.h"
+#include "button.h"
+#include "stock.h"
+#include "list.h"
+#include <ucx/mempool.h>
+#include "../common/context.h"
+
+static UcxMap *toolbar_items;
+static UcxList *defaults;
+
+void ui_toolbar_init() {
+    toolbar_items = ucx_map_new(16);
+}
+
+void ui_toolitem(char *name, char *label, ui_callback f, void *userdata) {
+    UiToolItem *item = malloc(sizeof(UiToolItem));
+    item->item.add_to = (ui_toolbar_add_f)add_toolitem_widget;
+    item->label = label;
+    item->image = NULL;
+    item->callback = f;
+    item->userdata = userdata;
+    item->groups = NULL;
+    item->isimportant = FALSE;
+    
+    ucx_map_cstr_put(toolbar_items, name, item);
+}
+
+void ui_toolitem_st(char *name, char *stockid, ui_callback f, void *userdata) {
+    ui_toolitem_stgr(name, stockid, f, userdata, -1);
+}
+
+void ui_toolitem_stgr(char *name, char *stockid, ui_callback f, void *userdata, ...) {
+    UiStToolItem *item = malloc(sizeof(UiStToolItem));
+    item->item.add_to = (ui_toolbar_add_f)add_toolitem_st_widget;
+    item->stockid = stockid;
+    item->callback = f;
+    item->userdata = userdata;
+    item->groups = NULL;
+    item->isimportant = FALSE;
+    
+    // add groups
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->groups = ucx_list_append(item->groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    ucx_map_cstr_put(toolbar_items, name, item);
+}
+
+void ui_toolitem_img(char *name, char *label, char *img, ui_callback f, void *udata) {
+    // TODO
+    
+    UiToolItem *item = malloc(sizeof(UiToolItem));
+    item->item.add_to = (ui_toolbar_add_f)add_toolitem_widget;
+    item->label = label;
+    item->image = img;
+    item->callback = f;
+    item->userdata = udata;
+    item->groups = NULL;
+    item->isimportant = FALSE;
+    
+    ucx_map_cstr_put(toolbar_items, name, item);
+}
+
+
+void ui_toolitem_toggle_stgr(char *name, char *stockid, ui_callback f, void *udata, ...) {
+    // TODO
+    
+    UiStToolItem *item = malloc(sizeof(UiStToolItem));
+    item->item.add_to = (ui_toolbar_add_f)add_toolitem_st_toggle_widget;
+    item->stockid = stockid;
+    item->callback = f;
+    item->userdata = udata;
+    item->groups = NULL;
+    item->isimportant = FALSE;
+    
+    // add groups
+    va_list ap;
+    va_start(ap, udata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->groups = ucx_list_append(item->groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    ucx_map_cstr_put(toolbar_items, name, item);
+}
+
+void ui_toolitem_toggle_imggr(char *name, char *label, char *img, ui_callback f, void *udata, ...) {
+    // TODO
+    
+    UiToolItem *item = malloc(sizeof(UiToolItem));
+    item->item.add_to = (ui_toolbar_add_f)add_toolitem_toggle_widget;
+    item->label = label;
+    item->image = img;
+    item->callback = f;
+    item->userdata = udata;
+    item->groups = NULL;
+    item->isimportant = FALSE;
+    
+    // add groups
+    va_list ap;
+    va_start(ap, udata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->groups = ucx_list_append(item->groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    ucx_map_cstr_put(toolbar_items, name, item);
+}
+
+void ui_toolbar_combobox(
+        char *name,
+        UiList *list,
+        ui_getvaluefunc getvalue,
+        ui_callback f,
+        void *udata)
+{
+    UiToolbarComboBox *cb = malloc(sizeof(UiToolbarComboBox));
+    cb->item.add_to = (ui_toolbar_add_f)add_toolbar_combobox;  
+    cb->list = list;
+    cb->getvalue = getvalue;
+    cb->callback = f;
+    cb->userdata = udata;
+    
+    ucx_map_cstr_put(toolbar_items, name, cb);
+}
+
+void ui_toolbar_combobox_str(
+        char *name,
+        UiList *list,
+        ui_callback f,
+        void *udata)
+{
+    ui_toolbar_combobox(name, list, ui_strmodel_getvalue, f, udata);
+}
+
+void ui_toolbar_combobox_nv(
+        char *name,
+        char *listname,
+        ui_getvaluefunc getvalue,
+        ui_callback f,
+        void *udata)
+{
+    UiToolbarComboBoxNV *cb = malloc(sizeof(UiToolbarComboBoxNV));
+    cb->item.add_to = (ui_toolbar_add_f)add_toolbar_combobox_nv;  
+    cb->listname = listname;
+    cb->getvalue = getvalue;
+    cb->callback = f;
+    cb->userdata = udata;
+    
+    ucx_map_cstr_put(toolbar_items, name, cb);
+}
+
+
+void ui_toolbar_add_default(char *name) {
+    char *s = strdup(name);
+    defaults = ucx_list_append(defaults, s);
+}
+
+Widget ui_create_toolbar(UiObject *obj, Widget parent) {
+    if(!defaults) {
+        return NULL;
+    }
+    
+    Arg args[8];
+    XtSetArg(args[0], XmNshadowType, XmSHADOW_ETCHED_OUT);
+    XtSetArg(args[1], XmNshadowThickness, 1);
+    XtSetArg(args[2], XmNtopAttachment, XmATTACH_FORM);
+    XtSetArg(args[3], XmNleftAttachment, XmATTACH_FORM);
+    XtSetArg(args[4], XmNrightAttachment, XmATTACH_FORM);
+    Widget frame = XmCreateFrame(parent, "toolbar_frame", args, 5);
+    
+    XtSetArg(args[0], XmNorientation, XmHORIZONTAL);
+    XtSetArg(args[1], XmNpacking, XmPACK_TIGHT);
+    XtSetArg(args[2], XmNspacing, 1);
+    Widget toolbar = XmCreateRowColumn (frame, "toolbar", args, 3);
+    
+    UCX_FOREACH(elm, defaults) {
+        UiToolItemI *item = ucx_map_cstr_get(toolbar_items, elm->data);
+        if(item) {
+            item->add_to(toolbar, item, obj);
+        } else if(!strcmp(elm->data, "@separator")) {
+            // TODO
+        } else {
+            fprintf(stderr, "UI Error: Unknown toolbar item: %s\n", elm->data);
+        }
+    }
+    
+    XtManageChild(toolbar);
+    XtManageChild(frame);
+    
+    return frame;
+}
+
+void add_toolitem_widget(Widget parent, UiToolItem *item, UiObject *obj) {
+    Arg args[4];
+    
+    XmString label = XmStringCreateLocalized(item->label);
+    XtSetArg(args[0], XmNlabelString, label);
+    XtSetArg(args[1], XmNshadowThickness, 1);
+    XtSetArg(args[2], XmNtraversalOn, FALSE);
+    Widget button = XmCreatePushButton(parent, "toolbar_button", args, 3);
+    
+    XmStringFree(label);
+    
+    if(item->callback) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = item->userdata;
+        event->callback = item->callback;
+        XtAddCallback(
+                button,
+                XmNactivateCallback,
+                (XtCallbackProc)ui_push_button_callback,
+                event);
+    }
+    
+    XtManageChild(button);
+    
+    if(item->groups) {
+        uic_add_group_widget(obj->ctx, button, item->groups);
+    }
+}
+
+void add_toolitem_st_widget(Widget parent, UiStToolItem *item, UiObject *obj) {
+    Arg args[8];
+    
+    UiStockItem *stock_item = ui_get_stock_item(item->stockid);
+     
+    XmString label = XmStringCreateLocalized(stock_item->label);
+    XtSetArg(args[0], XmNlabelString, label);
+    XtSetArg(args[1], XmNshadowThickness, 1);
+    XtSetArg(args[2], XmNtraversalOn, FALSE);
+    Widget button = XmCreatePushButton(parent, "toolbar_button", args, 3);
+ 
+    XmStringFree(label);
+    
+    if(item->callback) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = item->userdata;
+        event->callback = item->callback;
+        XtAddCallback(
+                button,
+                XmNactivateCallback,
+                (XtCallbackProc)ui_push_button_callback,
+                event);
+    }
+    
+    XtManageChild(button);
+    
+    if(item->groups) {
+        uic_add_group_widget(obj->ctx, button, item->groups);
+    }
+}
+
+void add_toolitem_toggle_widget(Widget parent, UiToolItem *item, UiObject *obj) {
+    Arg args[8];
+    
+    XmString label = XmStringCreateLocalized(item->label);
+    XtSetArg(args[0], XmNlabelString, label);
+    XtSetArg(args[1], XmNshadowThickness, 1);
+    XtSetArg(args[2], XmNtraversalOn, FALSE);
+    XtSetArg(args[3], XmNindicatorOn, XmINDICATOR_NONE);
+    Widget button = XmCreateToggleButton(parent, "toolbar_toggle_button", args, 4);
+    
+    XmStringFree(label);
+    
+    if(item->callback) {
+        UiEventData *event = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiEventData));
+        event->obj = obj;
+        event->userdata = item->userdata;
+        event->callback = item->callback;
+        XtAddCallback(
+                button,
+                XmNvalueChangedCallback,
+                (XtCallbackProc)ui_toggle_button_callback,
+                event);
+    }
+    
+    XtManageChild(button);
+    
+    if(item->groups) {
+        uic_add_group_widget(obj->ctx, button, item->groups);
+    }
+}
+
+void add_toolitem_st_toggle_widget(Widget parent, UiStToolItem *item, UiObject *obj) {
+    
+}
+
+void add_toolbar_combobox(Widget tb, UiToolbarComboBox *item, UiObject *obj) {
+    UiListView *listview = ucx_mempool_malloc(
+                obj->ctx->mempool,
+                sizeof(UiListView));
+    
+    UiVar *var = ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiVar));
+    var->value = item->list;
+    var->type = UI_VAR_SPECIAL;
+    
+    Arg args[8];
+    XtSetArg(args[0], XmNshadowThickness, 1);
+    XtSetArg(args[1], XmNindicatorOn, XmINDICATOR_NONE);
+    XtSetArg(args[2], XmNtraversalOn, FALSE);
+    XtSetArg(args[3], XmNwidth, 120);
+    Widget combobox = XmCreateDropDownList(tb, "toolbar_combobox", args, 4);
+    XtManageChild(combobox);
+    listview->widget = combobox;
+    listview->list = var;
+    listview->getvalue = item->getvalue;
+    
+    ui_listview_update(NULL, listview);
+    
+    if(item->callback) {
+        // TODO:
+        
+    }
+}
+
+void add_toolbar_combobox_nv(Widget tb, UiToolbarComboBoxNV *item, UiObject *obj) {
+    
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/toolbar.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,105 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TOOLBAR_H
+#define	TOOLBAR_H
+
+#include "../ui/toolbar.h"
+#include <ucx/map.h>
+#include <ucx/list.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiToolItemI    UiToolItemI;
+typedef struct UiToolItem     UiToolItem;
+typedef struct UiStToolItem   UiStToolItem;
+
+typedef struct UiToolbarComboBox   UiToolbarComboBox;
+typedef struct UiToolbarComboBoxNV UiToolbarComboBoxNV;
+
+typedef void(*ui_toolbar_add_f)(Widget, UiToolItemI*, UiObject*);
+
+struct UiToolItemI {
+    ui_toolbar_add_f  add_to;
+};
+
+struct UiToolItem {
+    UiToolItemI item;
+    char           *label;
+    void           *image;
+    ui_callback    callback;
+    void           *userdata;
+    UcxList        *groups;
+    Boolean        isimportant;
+};
+
+struct UiStToolItem {
+    UiToolItemI    item;
+    char           *stockid;
+    ui_callback    callback;
+    void           *userdata;
+    UcxList        *groups;
+    Boolean        isimportant;
+};
+
+struct UiToolbarComboBox {
+    UiToolItemI         item;
+    UiList              *list;
+    ui_getvaluefunc     getvalue;
+    ui_callback         callback;
+    void                *userdata;
+};
+
+struct UiToolbarComboBoxNV {
+    UiToolItemI         item;
+    char                *listname;
+    ui_getvaluefunc     getvalue;
+    ui_callback         callback;
+    void                *userdata;
+};
+
+void ui_toolbar_init();
+
+Widget ui_create_toolbar(UiObject *obj, Widget parent);
+
+void add_toolitem_widget(Widget tb, UiToolItem *item, UiObject *obj);
+void add_toolitem_st_widget(Widget tb, UiStToolItem *item, UiObject *obj);
+void add_toolitem_toggle_widget(Widget tb, UiToolItem *item, UiObject *obj);
+void add_toolitem_st_toggle_widget(Widget tb, UiStToolItem *item, UiObject *obj);
+
+void add_toolbar_combobox(Widget tb, UiToolbarComboBox *item, UiObject *obj);
+void add_toolbar_combobox_nv(Widget tb, UiToolbarComboBoxNV *item, UiObject *obj);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* TOOLBAR_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/toolkit.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,301 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <pthread.h>
+
+#include "toolkit.h"
+#include "toolbar.h"
+#include "stock.h"
+#include "../common/document.h"
+#include "../common/properties.h"
+#include <ucx/buffer.h>
+
+static XtAppContext app;
+static Display *display;
+static Widget active_window;
+static char *application_name;
+
+static ui_callback   startup_func;
+static void          *startup_data;
+static ui_callback   open_func;
+void                 *open_data;
+static ui_callback   exit_func;
+void                 *exit_data;
+
+static ui_callback appclose_fnc;
+static void *appclose_udata;
+
+static int is_toplevel_realized = 0;
+
+int event_pipe[2];
+
+
+static String fallback[] = {
+    	//"*fontList: -dt-interface system-medium-r-normal-s*utf*:",    
+        "*text_area*renderTable: f1",
+        "*f1*fontType: FONT_IS_XFT",
+        "*f1*fontName: Monospace",
+        "*f1*fontSize: 11",
+        "*renderTable: rt",
+        "*rt*fontType: FONT_IS_XFT",
+        "*rt*fontName: Sans",
+        "*rt*fontSize: 11",
+	NULL
+};
+
+void input_proc(XtPointer data, int *source, XtInputId *iid) {
+    void *ptr;
+    read(event_pipe[0], &ptr, sizeof(void*));
+}
+
+void ui_init(char *appname, int argc, char **argv) { 
+    application_name = appname;
+    
+    XtToolkitInitialize();
+    XtSetLanguageProc(NULL, NULL, NULL);
+    app = XtCreateApplicationContext();
+    XtAppSetFallbackResources(app, fallback);
+    
+    display =  XtOpenDisplay(app, NULL, appname, appname, NULL, 0, &argc, argv);
+    char **missing = NULL;
+    int nm = 0;
+    char *def = NULL;
+    XCreateFontSet(display, "-dt-interface system-medium-r-normal-s*utf*", &missing, &nm, &def);
+    
+    uic_docmgr_init();
+    ui_toolbar_init();
+    ui_stock_init();
+    
+    uic_load_app_properties();
+    
+    if(pipe(event_pipe)) {
+        fprintf(stderr, "UiError: Cannot create event pipe\n");
+        exit(-1);
+    }
+    XtAppAddInput(
+            app,
+            event_pipe[0],
+            (XtPointer)XtInputReadMask,
+            input_proc,
+            NULL);
+}
+
+char* ui_appname() {
+    return application_name;
+}
+
+Display* ui_get_display() {
+    return display;
+}
+
+void ui_onstartup(ui_callback f, void *userdata) {
+    startup_func = f;
+    startup_data = userdata;
+}
+
+void ui_onopen(ui_callback f, void *userdata) {
+    open_func = f;
+    open_data = userdata;
+}
+
+void ui_onexit(ui_callback f, void *userdata) {
+    exit_func = f;
+    exit_data = userdata;
+}
+
+void ui_main() {
+    if(startup_func) {
+        startup_func(NULL, startup_data);
+    }
+    XtAppMainLoop(app);
+    if(exit_func) {
+        exit_func(NULL, exit_data);
+    }
+    uic_store_app_properties();
+}
+
+void ui_exit_mainloop() {
+    XtAppSetExitFlag(app);
+}
+
+void ui_secondary_event_loop(int *loop) {
+    while(*loop && !XtAppGetExitFlag(app)) {
+        XEvent event;
+        XtAppNextEvent(app, &event);
+        XtDispatchEvent(&event);
+    }
+}
+
+void ui_show(UiObject *obj) {
+    uic_check_group_widgets(obj->ctx);
+    XtRealizeWidget(obj->widget);
+    ui_window_dark_theme(XtDisplay(obj->widget), XtWindow(obj->widget)); // TODO: if
+}
+
+// implemented in window.c
+//void ui_close(UiObject *obj)
+
+void ui_set_enabled(UIWIDGET widget, int enabled) {
+    XtSetSensitive(widget, enabled);
+}
+
+void ui_set_show_all(UIWIDGET widget, int value) {
+    if(!value) {
+        XtUnmanageChild(widget);
+    }
+}
+
+void ui_set_visible(UIWIDGET widget, int visible) {
+    if(visible) {
+        XtManageChild(widget);
+    } else {
+        XtUnmanageChild(widget);
+    }
+}
+
+static Boolean ui_job_finished(void *data) {
+    printf("WorkProc\n");
+    UiJob *job = data;
+    
+    UiEvent event;
+    event.obj = job->obj;
+    event.window = job->obj->window;
+    event.document = job->obj->ctx->document;
+    event.intval = 0;
+    event.eventdata = NULL;
+
+    job->finish_callback(&event, job->finish_data);
+    free(job);
+    return TRUE;
+}
+
+static void* ui_jobthread(void *data) {
+    UiJob *job = data;
+    int result = job->job_func(job->job_data);
+    if(!result) {
+        printf("XtAppAddWorkProc\n");
+        write(event_pipe[1], &job, sizeof(void*)); // hack
+        XtAppAddWorkProc(app, ui_job_finished, job);
+        
+    }
+}
+
+void ui_job(UiObject *obj, ui_threadfunc tf, void *td, ui_callback f, void *fd) {
+    UiJob *job = malloc(sizeof(UiJob));
+    job->obj = obj;
+    job->job_func = tf;
+    job->job_data = td;
+    job->finish_callback = f;
+    job->finish_data = fd;
+    pthread_t pid;
+    pthread_create(&pid, NULL, ui_jobthread, job);
+}
+
+void ui_clipboard_set(char *str) {
+    printf("copy: {%s}\n", str);
+    int length = strlen(str) + 1;
+    
+    Display *dp = XtDisplayOfObject(active_window);
+    Window window = XtWindowOfObject(active_window);
+    
+    XmString label = XmStringCreateLocalized("toolkit_clipboard");
+    long id = 0;
+    
+    while(XmClipboardStartCopy(
+            dp,
+            window,
+            label,
+            CurrentTime,
+            NULL,
+            NULL,
+            &id) == ClipboardLocked);
+    XmStringFree(label);
+    
+    while(XmClipboardCopy(
+            dp,
+            window,
+            id,
+            "STRING",
+            str, 
+            length,
+            1,
+            NULL) == ClipboardLocked);
+    
+    while(XmClipboardEndCopy(dp, window, id) == ClipboardLocked);
+}
+
+char* ui_clipboard_get() {
+    Display *dp = XtDisplayOfObject(active_window);
+    Window window = XtWindowOfObject(active_window);
+    
+    long id;
+    size_t size = 128;
+    char *buf = malloc(size);
+    
+    int r;
+    for(;;) {
+        r = XmClipboardRetrieve(dp, window, "STRING", buf, size, NULL, &id);
+        if(r == ClipboardSuccess) {
+            break;
+        } else if(r == ClipboardTruncate) {
+            size *= 2;
+            buf = realloc(buf, size);
+        } else if(r == ClipboardNoData) {
+            free(buf);
+            buf = NULL;
+            break;
+        }
+    }
+    
+    return buf;
+}
+
+void ui_set_active_window(Widget w) {
+    active_window = w;
+}
+
+Widget ui_get_active_window() {
+    return active_window;
+}
+
+void ui_window_dark_theme(Display *dp, Window window) {
+    Atom atom = XInternAtom(dp, "_GTK_THEME_VARIANT", False);
+    Atom type = XInternAtom(dp, "UTF8_STRING", False);
+    XChangeProperty(
+            dp, 
+            window, 
+            atom,
+            type,
+            8,
+            PropModeReplace,
+            (const unsigned char*)"dark",
+            4);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/toolkit.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,74 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TOOLKIT_H
+#define	TOOLKIT_H
+
+#include <inttypes.h>
+#include "../ui/toolkit.h"
+#include "../common/context.h"
+#include "../common/object.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+Display* ui_get_display();
+
+typedef struct UiEventData {
+    UiObject    *obj;
+    ui_callback callback;
+    void        *userdata;
+    int         value;
+} UiEventData;
+
+typedef struct UiJob {
+    UiObject      *obj;
+    ui_threadfunc job_func;
+    void          *job_data;
+    ui_callback   finish_callback;
+    void          *finish_data;
+} UiJob;
+
+typedef enum UiOrientation UiOrientation;
+enum UiOrientation { UI_HORIZONTAL = 0, UI_VERTICAL };
+
+void ui_exit_mainloop();
+
+void ui_set_active_window(Widget w);
+Widget ui_get_active_window();
+
+void ui_secondary_event_loop(int *loop);
+void ui_window_dark_theme(Display *dp, Window window);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* TOOLKIT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/tree.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,324 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include "tree.h"
+
+#include "container.h"
+#include "../common/object.h"
+#include "../common/context.h"
+#include <ucx/utils.h>
+
+UIWIDGET ui_table_var(UiObject *obj, UiVar *var, UiModel *model, UiListCallbacks cb) {
+    // TODO: check if modelinfo is complete
+    
+    Arg args[32];
+    int n = 0;
+    
+    // create scrolled window
+    UiContainer *ct = uic_get_current_container(obj);
+    Widget parent = ct->prepare(ct, args, &n, TRUE);
+    
+    XtSetArg(args[n], XmNscrollingPolicy, XmAUTOMATIC);
+    n++;
+    XtSetArg(args[n], XmNshadowThickness, 0);
+    n++;
+    Widget scrollw = XmCreateScrolledWindow(parent, "scroll_win", args, n);
+    ct->add(ct, scrollw);
+    XtManageChild(scrollw);
+    
+    // create table headers
+    XmStringTable header = (XmStringTable)XtMalloc(
+            model->columns * sizeof(XmString));
+    for(int i=0;i<model->columns;i++) {
+        header[i] = XmStringCreateLocalized(model->titles[i]);
+    }
+    n = 0;
+    XtSetArg(args[n], XmNdetailColumnHeading, header);
+    n++;
+    XtSetArg(args[n], XmNdetailColumnHeadingCount, model->columns);
+    n++;
+    
+    // set res
+    XtSetArg(args[n], XmNlayoutType, XmDETAIL);
+    n++;
+    XtSetArg(args[n], XmNentryViewType, XmSMALL_ICON);
+    n++;
+    XtSetArg(args[n], XmNselectionPolicy, XmSINGLE_SELECT);
+    n++;
+    XtSetArg(args[n], XmNwidth, 600);
+    n++;
+    
+    // create widget
+    //UiContainer *ct = uic_get_current_container(obj);
+    //Widget parent = ct->add(ct, args, &n);
+    
+    Widget container = XmCreateContainer(scrollw, "table", args, n);
+    XtManageChild(container);
+    
+    // add callbacks
+    UiTreeEventData *event = ui_malloc(obj->ctx, sizeof(UiTreeEventData));
+    event->obj = obj;
+    event->activate = cb.activate;
+    event->selection = cb.selection;
+    event->userdata = cb.userdata;
+    event->last_selection = NULL;
+    if(cb.selection) {
+        XtAddCallback(
+                container,
+                XmNselectionCallback,
+                (XtCallbackProc)ui_table_select_callback,
+                event);
+    }
+    if(cb.activate) {
+        XtAddCallback(
+                container,
+                XmNdefaultActionCallback,
+                (XtCallbackProc)ui_table_action_callback,
+                event);
+    }
+    
+    // add initial data
+    UiList *list = var->value;
+    void *data = list->first(list);
+    int width = 0;
+    while(data) {
+        int w = ui_add_icon_gadget(container, model, data);
+        if(w > width) {
+            width = w;
+        }
+        data = list->next(list);
+    }
+    
+    UiTableView *tableview = ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiTableView));
+    tableview->widget = container;
+    tableview->var = var;
+    tableview->model = model;
+    
+    // set new XmContainer width
+    XtVaSetValues(container, XmNwidth, width, NULL);
+    
+    // cleanup
+    for(int i=0;i<model->columns;i++) {
+        XmStringFree(header[i]);
+    }
+    XtFree((char*)header);
+    
+    return scrollw;
+}
+
+UIWIDGET ui_table(UiObject *obj, UiList *data, UiModel *model, UiListCallbacks cb) {
+    UiVar *var = malloc(sizeof(UiVar));
+    var->value = data;
+    var->type = UI_VAR_SPECIAL;
+    return ui_table_var(obj, var, model, cb);
+}
+
+void ui_table_update(UiEvent *event, UiTableView *view) {
+    // clear container
+    Widget *children;
+    int nc;
+
+    XtVaGetValues(
+            view->widget,
+            XmNchildren,
+            &children,
+            XmNnumChildren,
+            &nc,
+            NULL);
+
+    for(int i=0;i<nc;i++) {
+        XtDestroyWidget(children[i]);
+    }
+    
+    UiList *list = view->var->value;
+    
+    void *data = list->first(list);
+    int width = 0;
+    while(data) {
+        int w = ui_add_icon_gadget(view->widget, view->model, data);
+        if(w > width) {
+            width = w;
+        }
+        data = list->next(list);
+    }
+    
+}
+
+#define UI_COL_CHAR_WIDTH 12
+
+int ui_add_icon_gadget(Widget container, UiModel *model, void *data) {
+    int width = 50;
+    
+    if(model->columns == 0) {
+        return width;
+    }
+    
+    XmString label = NULL;
+    Arg args[8];
+    Boolean f;
+    // first column
+    if(model->types[0] != 12345678) { // TODO: icon/label type
+        char *str = ui_type_to_string(
+                model->types[0],
+                model->getvalue(data, 0),
+                &f);
+        
+        // column width
+        width += strlen(str) * UI_COL_CHAR_WIDTH;
+        
+        
+        XmString label = XmStringCreateLocalized(str);
+        XtSetArg(args[0], XmNlabelString, label);
+        if(f) {
+            free(str);
+        }
+    } else {
+        // TODO
+    }
+            
+    // remaining columns are the icon gadget details
+    XmStringTable details = (XmStringTable)XtMalloc(
+            (model->columns - 1) * sizeof(XmString));
+    for(int i=1;i<model->columns;i++) {
+        char *str = ui_type_to_string(
+                model->types[i],
+                model->getvalue(data, i),
+                &f);
+        
+        // column width
+        width += strlen(str) * UI_COL_CHAR_WIDTH;
+        
+        details[i - 1] = XmStringCreateLocalized(str);
+        if(f) {
+            free(str);
+        }
+    }
+    XtSetArg(args[1], XmNdetail, details);
+    XtSetArg(args[2], XmNdetailCount, model->columns - 1);
+    XtSetArg(args[3], XmNshadowThickness, 0); 
+    // create widget
+    Widget item = XmCreateIconGadget(container, "table_item", args, 4);
+    XtManageChild(item);
+    
+    // cleanup
+    XmStringFree(label);
+    for(int i=0;i<model->columns-1;i++) {
+        XmStringFree(details[i]);
+    }
+    XtFree((char*)details);
+    
+    return width;
+}
+
+char* ui_type_to_string(UiModelType type, void *data, Boolean *free) {
+    switch(type) {
+        case UI_STRING: *free = FALSE; return data;
+        case UI_INTEGER: {
+            *free = TRUE;
+            int *val = data;
+            sstr_t str = ucx_asprintf(ucx_default_allocator(), "%d", *val);
+            return str.ptr;
+        }
+    }
+    *free = FALSE;
+    return NULL;
+}
+
+void ui_table_action_callback(
+        Widget widget,
+        UiTreeEventData *event,
+        XmContainerSelectCallbackStruct *sel)
+{ 
+    UiListSelection *selection = ui_list_selection(sel);
+    
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = event->obj->window;
+    e.document = event->obj->ctx->document;
+    e.eventdata = selection;
+    e.intval = selection->count > 0 ? selection->rows[0] : -1;
+    event->activate(&e, event->userdata);
+    
+    free(event->last_selection->rows);
+    free(event->last_selection);
+    event->last_selection = selection;
+}
+
+void ui_table_select_callback(
+        Widget widget,
+        UiTreeEventData *event,
+        XmContainerSelectCallbackStruct *sel)
+{ 
+    UiListSelection *selection = ui_list_selection(sel);
+    if(!ui_compare_list_selection(selection, event->last_selection)) {
+        UiEvent e;
+        e.obj = event->obj;
+        e.window = event->obj->window;
+        e.document = event->obj->ctx->document;
+        e.eventdata = selection;
+        e.intval = selection->count > 0 ? selection->rows[0] : -1;
+        event->selection(&e, event->userdata);
+    }
+    if(event->last_selection) {
+        free(event->last_selection->rows);
+        free(event->last_selection);
+    }
+    event->last_selection = selection;
+}
+
+UiListSelection* ui_list_selection(XmContainerSelectCallbackStruct *xs) {
+    UiListSelection *selection = malloc(sizeof(UiListSelection));
+    selection->count = xs->selected_item_count;
+    selection->rows = calloc(selection->count, sizeof(int));
+    for(int i=0;i<selection->count;i++) {
+        int index;
+        XtVaGetValues(xs->selected_items[i], XmNpositionIndex, &index, NULL);
+        selection->rows[i] = index;
+    }
+    return selection;
+}
+
+Boolean ui_compare_list_selection(UiListSelection *s1, UiListSelection *s2) {
+    if(!s1 || !s2) {
+        return FALSE;
+    } 
+    if(s1->count != s2->count) {
+        return FALSE;
+    }
+    for(int i=0;i<s1->count;i++) {
+        if(s1->rows[i] != s2->rows[i]) {
+            return FALSE;
+        }
+    }
+    return TRUE;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/tree.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,76 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TREE_H
+#define	TREE_H
+
+#include "../ui/tree.h"
+#include "../common/context.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiTreeEventData {
+    UiObject        *obj;
+    ui_callback     activate;
+    ui_callback     selection;
+    void            *userdata;
+    UiListSelection *last_selection;
+} UiTreeEventData;    
+
+typedef struct UiTableView {
+    Widget      widget;
+    UiVar       *var;
+    UiModel     *model;
+} UiTableView;
+
+void ui_table_update(UiEvent *event, UiTableView *view);
+int ui_add_icon_gadget(Widget container, UiModel *model, void *data);
+char* ui_type_to_string(UiModelType type, void *data, Boolean *free);
+
+void ui_table_action_callback(
+        Widget widget,
+        UiTreeEventData *event,
+        XmContainerSelectCallbackStruct *sel);
+void ui_table_select_callback(
+        Widget widget,
+        UiTreeEventData *event,
+        XmContainerSelectCallbackStruct *sel);
+
+UiListSelection* ui_list_selection(XmContainerSelectCallbackStruct *xs);
+
+Boolean ui_compare_list_selection(UiListSelection *s1, UiListSelection *s2);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* TREE_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/window.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,208 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "toolkit.h"
+#include "menu.h"
+#include "toolbar.h"
+#include "container.h"
+#include "../ui/window.h"
+#include "../common/context.h"
+
+static int nwindows = 0;
+
+static int window_default_width = 600;
+static int window_default_height = 500;
+
+static void window_close_handler(Widget window, void *udata, void *cdata) {
+    UiObject *obj = udata;
+    UiEvent ev;
+    ev.window = obj->window;
+    ev.document = obj->ctx->document;
+    ev.obj = obj;
+    ev.eventdata = NULL;
+    ev.intval = 0;
+    
+    if(obj->ctx->close_callback) {
+        obj->ctx->close_callback(&ev, obj->ctx->close_data);
+    }
+    // TODO: free UiObject
+    
+    nwindows--;
+    if(nwindows == 0) {
+        ui_exit_mainloop();
+    }
+}
+
+static UiObject* create_window(char *title, void *window_data, UiBool simple) {
+    UcxMempool *mp = ucx_mempool_new(256);
+    UiObject *obj = ucx_mempool_calloc(mp, 1, sizeof(UiObject));
+    obj->ctx = uic_context(obj, mp);
+    obj->window = window_data;
+    
+    Arg args[16];
+    int n = 0;
+    
+    XtSetArg(args[0], XmNtitle, title);
+    //XtSetArg(args[1], XmNbaseWidth, window_default_width);
+    //XtSetArg(args[2], XmNbaseHeight, window_default_height);
+    XtSetArg(args[1], XmNminWidth, 100);
+    XtSetArg(args[2], XmNminHeight, 50);
+    XtSetArg(args[3], XmNwidth, window_default_width);
+    XtSetArg(args[4], XmNheight, window_default_height);
+    
+    Widget toplevel = XtAppCreateShell(
+            "Test123",
+            "abc",
+            //applicationShellWidgetClass,
+            vendorShellWidgetClass,
+            ui_get_display(),
+            args,
+            5);
+    
+    Atom wm_delete_window;
+    wm_delete_window = XmInternAtom(
+            XtDisplay(toplevel),
+            "WM_DELETE_WINDOW",
+            0);
+    XmAddWMProtocolCallback(
+            toplevel,
+            wm_delete_window,
+            window_close_handler,
+            obj);
+    
+    // TODO: use callback
+    ui_set_active_window(toplevel);
+    
+    Widget window = XtVaCreateManagedWidget(
+            title,
+            xmMainWindowWidgetClass,
+            toplevel,
+            NULL);
+    obj->widget = window;
+    Widget form = XtVaCreateManagedWidget(
+            "window_form",
+            xmFormWidgetClass,
+            window,
+            NULL);
+    Widget toolbar = NULL;
+    
+    if(!simple) {
+        ui_create_menubar(obj);
+        toolbar = ui_create_toolbar(obj, form);
+    }
+    
+    // window content
+    XtSetArg(args[0], XmNshadowType, XmSHADOW_ETCHED_OUT);
+    XtSetArg(args[1], XmNshadowThickness, 0);
+    XtSetArg(args[2], XmNleftAttachment, XmATTACH_FORM);
+    XtSetArg(args[3], XmNrightAttachment, XmATTACH_FORM);
+    XtSetArg(args[4], XmNbottomAttachment, XmATTACH_FORM);
+    if(toolbar) {
+        XtSetArg(args[5], XmNtopAttachment, XmATTACH_WIDGET);
+        XtSetArg(args[6], XmNtopWidget, toolbar);
+        n = 7;
+    } else {
+        XtSetArg(args[5], XmNtopAttachment, XmATTACH_FORM);
+        n = 6;
+    }
+    Widget frame = XmCreateFrame(form, "content_frame", args, n);
+    XtManageChild(frame);
+    
+    Widget content_form = XmCreateForm(frame, "content_form", NULL, 0);
+    XtManageChild(content_form);
+    obj->container = ui_box_container(obj, content_form, 0, 0, UI_BOX_VERTICAL);
+    
+    XtManageChild(form);
+      
+    obj->widget = toplevel;
+    nwindows++;
+    return obj;
+}
+
+UiObject* ui_window(char *title, void *window_data) {
+    return create_window(title, window_data, FALSE);
+}
+
+UiObject* ui_simplewindow(char *title, void *window_data) {
+    return create_window(title, window_data, TRUE);
+}
+
+void ui_close(UiObject *obj) {
+    XtDestroyWidget(obj->widget);
+    window_close_handler(obj->widget, obj, NULL);
+}
+
+typedef struct FileDialogData {
+    int  running;
+    char *file;
+} FileDialogData;
+
+static void filedialog_select(
+        Widget widget,
+        FileDialogData *data,
+        XmFileSelectionBoxCallbackStruct *selection)
+{
+    char *path = NULL;
+    XmStringGetLtoR(selection->value, XmSTRING_DEFAULT_CHARSET, &path);
+    data->running = 0;
+    data->file = strdup(path);
+    XtFree(path);
+    XtUnmanageChild(widget);
+}
+
+static void filedialog_cancel(
+        Widget widget,
+        FileDialogData *data,
+        XmFileSelectionBoxCallbackStruct *selection)
+
+{
+    data->running = 0;
+    XtUnmanageChild(widget);
+}
+
+char* ui_openfiledialog(UiObject *obj) {
+    Widget dialog = XmCreateFileSelectionDialog(obj->widget, "openfiledialog", NULL, 0);
+    XtManageChild(dialog);
+    
+    FileDialogData data;
+    data.running = 1;
+    data.file = NULL;
+    
+    XtAddCallback(dialog, XmNokCallback, (XtCallbackProc)filedialog_select, &data);
+    XtAddCallback(dialog, XmNcancelCallback, (XtCallbackProc)filedialog_cancel, &data);
+    
+    ui_secondary_event_loop(&data.running);
+    return data.file;
+}
+
+char* ui_savefiledialog(UiObject *obj) {
+    return ui_openfiledialog(obj);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/Makefile	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,41 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2012 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+QT_MAKEFILE = ../build/ui/qt/Makefile.mk
+
+UI_QT_LIB = ../build/ui/qt/
+
+$(QT_MAKEFILE): qt/qt4.pro
+	qmake-qt4 -o - qt/qt4.pro > $(QT_MAKEFILE)
+
+$(UI_LIB): $(QT_MAKEFILE) $(OBJ) FORCE
+	$(MAKE) -f $(QT_MAKEFILE)
+	$(AR) $(ARFLAGS) $(UI_LIB) $(OBJ)
+
+FORCE:
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/button.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,90 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "button.h"
+#include "container.h"
+#include "toolkit.h"
+
+UIWIDGET ui_button(UiObject *obj, char *label, ui_callback f, void *data) {
+    QString str = QString::fromUtf8(label);
+    QPushButton *button = new QPushButton(str);
+    
+    if(f) {
+        UiEventWrapper *event = new UiEventWrapper(obj, f, data);
+        button->connect(button, SIGNAL(clicked()), event, SLOT(slot()));
+    }
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(button, false);
+    
+    return button;
+}
+
+
+
+// TODO: checkbox
+
+
+UIWIDGET ui_radiobutton(UiObject *obj, char *label, UiInteger *rgroup)  {
+    QString str = QString::fromUtf8(label);
+    QRadioButton *button = new QRadioButton(str);
+    button->setAutoExclusive(false);
+    
+    if(rgroup) {
+        QButtonGroup *buttonGroup = (QButtonGroup*)rgroup->obj;
+        if(!buttonGroup) {
+            buttonGroup = new QButtonGroup();
+            rgroup->obj = buttonGroup;
+            button->setChecked(true);
+        }
+        buttonGroup->addButton(button, buttonGroup->buttons().size());
+        
+        rgroup->get = ui_radiobutton_get;
+        rgroup->set = ui_radiobutton_set;
+    }
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(button, false);
+    
+    return button;
+}
+
+int ui_radiobutton_get(UiInteger *value) {
+    QButtonGroup *buttonGroup = (QButtonGroup*)value->obj;
+    value->value = buttonGroup->checkedId();
+    return value->value;
+}
+
+void ui_radiobutton_set(UiInteger *value, int i) {
+    QButtonGroup *buttonGroup = (QButtonGroup*)value->obj;
+    QAbstractButton *button = buttonGroup->button(i);
+    if(button) {
+        button->setChecked(true);
+        value->value = i;
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/button.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,47 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef BUTTON_H
+#define	BUTTON_H
+
+#include "toolkit.h"
+#include "../ui/button.h"
+#include <QPushButton>
+#include <QRadioButton>
+#include <QButtonGroup>
+
+extern "C" {
+    
+int ui_radiobutton_get(UiInteger *value);
+
+void ui_radiobutton_set(UiInteger *value, int i);
+
+}
+
+#endif	/* BUTTON_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/container.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,256 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include "container.h"
+
+#include <QSpacerItem>
+#include <QStackedWidget>
+
+
+/* -------------------- UiBoxContainer -------------------- */
+
+UiBoxContainer::UiBoxContainer(QBoxLayout* box) {
+    this->current = NULL;
+    this->menu = NULL;
+    this->box = box;
+    box->setContentsMargins(QMargins(0,0,0,0));
+    box->setSpacing(0);
+    
+    ui_reset_layout(layout);
+}
+
+void UiBoxContainer::add(QWidget* widget, bool fill) {
+    if(layout.fill != UI_LAYOUT_UNDEFINED) {
+        fill = ui_lb2bool(layout.fill);
+    }
+    
+    if(hasStretchedWidget && fill) {
+        fill = false;
+        fprintf(stderr, "UiError: container has 2 filled widgets");
+    }
+    
+    box->addWidget(widget, fill);
+    
+    if(!hasStretchedWidget) {
+        QSpacerItem *newspace = new QSpacerItem(0, 0, QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
+        box->removeItem(space);
+        box->addSpacerItem(newspace);
+        space = newspace; 
+    }
+    
+    if(fill) {
+        hasStretchedWidget = true;
+    }
+    ui_reset_layout(layout);
+    current = widget;
+}
+
+UIWIDGET ui_box(UiObject *obj, QBoxLayout::Direction dir) {
+    UiContainer *ct = uic_get_current_container(obj);
+    QWidget *widget = new QWidget();
+    QBoxLayout *box = new QBoxLayout(dir);
+    widget->setLayout(box);
+    ct->add(widget, true);
+    
+    UiObject *newobj = uic_object_new(obj, widget);
+    newobj->container = new UiBoxContainer(box);
+    uic_obj_add(obj, newobj);
+    
+    return widget;
+}
+
+UIWIDGET ui_vbox(UiObject *obj) {
+    return ui_box(obj, QBoxLayout::TopToBottom);
+}
+
+UIWIDGET ui_hbox(UiObject *obj) {
+    return ui_box(obj, QBoxLayout::LeftToRight);
+}
+
+
+
+/* -------------------- UiGridContainer -------------------- */
+
+UiGridContainer::UiGridContainer(QGridLayout* grid, int margin, int columnspacing, int rowspacing) {
+    this->current = NULL;
+    this->menu = NULL;
+    this->grid = grid;
+    grid->setContentsMargins(QMargins(margin, margin, margin, margin));
+    grid->setHorizontalSpacing(columnspacing);
+    grid->setVerticalSpacing(rowspacing);
+    ui_reset_layout(layout);
+}
+
+void UiGridContainer::add(QWidget* widget, bool fill) {
+    if(layout.newline) {
+        x = 0;
+        y++;
+    }
+    
+    Qt::Alignment alignment = Qt::AlignTop;
+    grid->setColumnStretch(x, layout.hexpand ? 1 : 0);
+    if(layout.vexpand) {
+        grid->setRowStretch(y, 1);
+        alignment = 0;
+    } else {
+        grid->setRowStretch(y, 0);
+    }
+    
+    int gwidth = layout.gridwidth > 0 ? layout.gridwidth : 1;
+    
+    grid->addWidget(widget, y, x, 1, gwidth, alignment);
+    x += gwidth;
+    
+    ui_reset_layout(layout);
+    current = widget;
+}
+
+UIWIDGET ui_grid(UiObject *obj) {
+    return ui_grid_sp(obj, 0, 0, 0);
+}
+
+UIWIDGET ui_grid_sp(UiObject *obj, int margin, int columnspacing, int rowspacing) {
+    UiContainer *ct = uic_get_current_container(obj);
+    QWidget *widget = new QWidget();
+    QGridLayout *grid = new QGridLayout();
+    widget->setLayout(grid);
+    ct->add(widget, true);
+    
+    UiObject *newobj = uic_object_new(obj, widget);
+    newobj->container = new UiGridContainer(grid, margin, columnspacing, rowspacing);
+    uic_obj_add(obj, newobj);
+    
+    return widget;
+}
+
+
+/* -------------------- UiTabViewContainer -------------------- */
+
+UiTabViewContainer::UiTabViewContainer(QTabWidget* tabwidget) {
+    this->current = NULL;
+    this->menu = NULL;
+    this->tabwidget = tabwidget;
+}
+
+void UiTabViewContainer::add(QWidget* widget, bool fill) {
+    QString str = QString::fromUtf8(layout.label);
+    tabwidget->addTab(widget, str);
+}
+
+
+/* -------------------- UiStackContainer -------------------- */
+
+UiStackContainer::UiStackContainer(QStackedWidget *stack) {
+    this->stack = stack;
+}
+
+void UiStackContainer::add(QWidget* widget, bool fill) {
+    stack->addWidget(widget);
+    current = widget;
+}
+
+UIWIDGET ui_tabview(UiObject *obj) {
+    QStackedWidget *tabwidget = new QStackedWidget();
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(tabwidget, true);
+    
+    UiObject *tabviewobj = uic_object_new(obj, tabwidget);
+    tabviewobj->container = new UiStackContainer(tabwidget);
+    uic_obj_add(obj, tabviewobj);
+    
+    return tabwidget;
+}
+
+void ui_tab(UiObject *obj, char *title) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.label = title;
+    ui_vbox(obj);
+}
+
+void ui_select_tab(UIWIDGET tabview, int tab) {
+    QStackedWidget *w = (QStackedWidget*)tabview;
+    w->setCurrentIndex(tab);
+}
+
+
+/* -------------------- UiSidebarContainer -------------------- */
+
+UiSidebarContainer::UiSidebarContainer(QSplitter *splitter) {
+    this->splitter = splitter;
+}
+
+UIWIDGET ui_sidebar(UiObject *obj) {
+    QSplitter *splitter = new QSplitter(Qt::Horizontal);
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(splitter, true);
+    
+    UiObject *left = uic_object_new(obj, splitter);
+    left->container = new UiSidebarContainer(splitter);
+    
+    UiObject *right = uic_object_new(obj, splitter);
+    right->container = new UiSidebarContainer(splitter);
+    
+    uic_obj_add(obj, right);
+    uic_obj_add(obj, left);
+    
+    return splitter;
+}
+
+void UiSidebarContainer::add(QWidget *widget, bool fill) {
+    splitter->addWidget(widget);
+}
+
+
+/* -------------------- layout functions -------------------- */
+
+void ui_layout_fill(UiObject *obj, UiBool fill) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.fill = ui_bool2lb(fill);
+}
+
+void ui_layout_hexpand(UiObject *obj, UiBool expand) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.hexpand = expand;
+}
+
+void ui_layout_vexpand(UiObject *obj, UiBool expand) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.vexpand = expand;
+}
+
+void ui_layout_gridwidth(UiObject *obj, int width) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.gridwidth = width;
+}
+
+void ui_newline(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->layout.newline = TRUE;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/container.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,119 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CONTAINER_H
+#define	CONTAINER_H
+
+#include "toolkit.h"
+#include "window.h"
+
+#include <string.h>
+#include <QBoxLayout>
+#include <QGridLayout>
+#include <QTabWidget>
+#include <QStackedWidget>
+#include <QSplitter>
+
+#define ui_lb2bool(b) ((b) == UI_LAYOUT_TRUE ? TRUE : FALSE)
+#define ui_bool2lb(b) ((b) ? UI_LAYOUT_TRUE : UI_LAYOUT_FALSE)
+#define ui_reset_layout(layout) memset(&(layout), 0, sizeof(UiLayout))
+
+typedef struct UiLayout UiLayout;
+
+enum UiLayoutBool {
+    UI_LAYOUT_UNDEFINED = 0,
+    UI_LAYOUT_TRUE,
+    UI_LAYOUT_FALSE,
+};
+typedef enum UiLayoutBool UiLayoutBool;
+
+struct UiLayout {
+    UiLayoutBool fill;
+    bool newline;
+    char *label;
+    bool hexpand;
+    bool vexpand;
+    int  gridwidth;
+};
+
+struct UiContainer {
+    UiLayout layout; 
+    UIWIDGET current;
+    QMenu    *menu;
+
+    virtual void add(QWidget *widget, bool fill) = 0;
+};
+
+class UiBoxContainer : public UiContainer {
+public:
+    QBoxLayout  *box;
+    bool        hasStretchedWidget = false;
+    QSpacerItem *space;
+    
+    UiBoxContainer(QBoxLayout *box);
+    
+    virtual void add(QWidget *widget, bool fill);
+};
+
+class UiGridContainer : public UiContainer {
+public:
+    QGridLayout *grid;
+    int x = 0;
+    int y = 0;
+    
+    UiGridContainer(QGridLayout *grid, int margin, int columnspacing, int rowspacing);
+    
+    virtual void add(QWidget *widget, bool fill);
+};
+
+class UiTabViewContainer : public UiContainer {
+public:
+    QTabWidget *tabwidget;
+    
+    UiTabViewContainer(QTabWidget *tabwidget);
+    virtual void add(QWidget *widget, bool fill);
+};
+
+class UiStackContainer : public UiContainer {
+public:
+    QStackedWidget *stack;
+    
+    UiStackContainer(QStackedWidget *stack);
+    virtual void add(QWidget *widget, bool fill);
+};
+
+class UiSidebarContainer : public UiContainer {
+public:
+    QSplitter *splitter;
+    
+    UiSidebarContainer(QSplitter *splitter);
+    virtual void add(QWidget *widget, bool fill);
+};
+
+#endif	/* CONTAINER_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/graphics.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,151 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "graphics.h"
+#include "container.h"
+
+
+DrawingArea::DrawingArea(UiObject *obj, ui_drawfunc cb, void *data) {
+    object = obj;
+    drawCallback = cb;
+    userdata = data;
+}
+
+DrawingArea::~DrawingArea() {
+    
+}
+
+void DrawingArea::paintEvent(QPaintEvent *event) {
+    QPainter painter(this);
+    
+    UiQtGraphics g;
+    g.g.width = this->width();
+    g.g.height = this->height();
+    g.painter = &painter;
+    
+    UiEvent ev;
+    ev.obj = object;
+    ev.window = object->window;
+    ev.document = object->ctx->document;
+    ev.eventdata = NULL;
+    ev.intval = 0;
+    
+    drawCallback(&ev, &g.g, userdata);
+}
+
+
+
+UIWIDGET ui_drawingarea(UiObject *obj, ui_drawfunc f, void *userdata) {
+    DrawingArea *widget = new DrawingArea(obj, f, userdata);
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(widget, true);
+    
+    return widget;
+}
+
+void ui_drawingarea_mousehandler(UiObject *obj, UIWIDGET widget, ui_callback f, void *u) {
+    
+}
+
+void ui_drawingarea_getsize(UIWIDGET drawingarea, int *width, int *height) {
+    
+}
+
+void ui_drawingarea_redraw(UIWIDGET drawingarea) {
+    
+}
+
+
+/* -------------------- text layout functions -------------------- */
+
+UiTextLayout* ui_text(UiGraphics *g) {
+    UiTextLayout *textlayout = new UiTextLayout();
+    return textlayout;
+}
+
+void ui_text_free(UiTextLayout *text) {
+    delete text;
+}
+
+void ui_text_setstring(UiTextLayout *layout, char *str) {
+    layout->text.setText(QString::fromUtf8(str));
+}
+
+void ui_text_setstringl(UiTextLayout *layout, char *str, int len) {
+    layout->text.setText(QString::fromUtf8(str, len));
+}
+
+void ui_text_setfont(UiTextLayout *layout, char *font, int size) {
+    layout->font = QFont(QString::fromUtf8(font), size);
+}
+
+void ui_text_getsize(UiTextLayout *layout, int *width, int *height) {
+    QSizeF size = layout->text.size();
+    *width = (int)size.width();
+    *height = (int)size.height();
+}
+
+void ui_text_setwidth(UiTextLayout *layout, int width) {
+    layout->text.setTextWidth((qreal)width);
+}
+
+
+/* -------------------- drawing functions -------------------- */
+
+void ui_graphics_color(UiGraphics *g, int red, int green, int blue) {
+    UiQtGraphics *gr = (UiQtGraphics*)g;
+    gr->color = QColor(red, green, blue);
+    gr->painter->setPen(gr->color);
+}
+
+void ui_draw_line(UiGraphics *g, int x1, int y1, int x2, int y2) {
+    UiQtGraphics *gr = (UiQtGraphics*)g;
+    
+    gr->painter->drawLine(x1, y1, x2, y2);
+}
+
+void ui_draw_rect(UiGraphics *g, int x, int y, int w, int h, int fill) {
+    UiQtGraphics *gr = (UiQtGraphics*)g;
+    
+    QRect rect(x, y, w, h);
+    if(fill) {
+        gr->painter->fillRect(rect, gr->color);
+        
+    } else {
+        gr->painter->drawRect(rect);
+    }
+}
+
+void ui_draw_text(UiGraphics *g, int x, int y, UiTextLayout *text) {
+    UiQtGraphics *gr = (UiQtGraphics*)g;
+    
+    gr->painter->setFont(text->font);
+    gr->painter->drawStaticText(x, y, text->text);
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/graphics.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,67 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GRAPHICS_H
+#define GRAPHICS_H
+
+#include "toolkit.h"
+#include "../ui/graphics.h"
+
+#include <QWidget>
+#include <QPainter>
+#include <QColor>
+#include <QStaticText>
+
+typedef struct UiQtGraphics {
+    UiGraphics g;
+    QPainter   *painter;
+    QColor     color;
+} UiXlibGraphics;
+
+struct UiTextLayout {
+    QStaticText text;
+    QFont font;
+};
+
+
+class DrawingArea : public QWidget {
+    Q_OBJECT
+    
+    UiObject    *object;
+    ui_drawfunc drawCallback;
+    void        *userdata;
+    
+public:
+    DrawingArea(UiObject *obj, ui_drawfunc cb, void *data);
+    ~DrawingArea();
+    
+    virtual void paintEvent(QPaintEvent * event);
+};
+
+#endif /* GRAPHICS_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/label.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,51 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "label.h"
+#include "container.h"
+#include "toolkit.h"
+
+UIWIDGET ui_label(UiObject *obj, char *label) {
+    QString str = QString::fromUtf8(label);
+    QLabel *widget = new QLabel(str);
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(widget, false);
+    
+    return widget;
+}
+
+UIWIDGET ui_space(UiObject *obj) {
+    // TODO: maybe there is a better widget for this purpose
+    QLabel *widget = new QLabel();
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(widget, true);
+    
+    return widget;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/label.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,36 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef LABEL_H
+#define	LABEL_H
+
+#include "toolkit.h"
+#include <QLabel>
+
+#endif	/* LABEL_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/menu.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,425 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <QMenuBar>
+#include <QAction>
+
+#include "menu.h"
+#include "toolkit.h"
+#include "../common/context.h"
+#include "../ui/properties.h"
+#include "../ui/window.h"
+#include "stock.h"
+#include "container.h"
+
+static UcxList *menus;
+static UcxList *current;
+
+/* -------------------------- UiMenu -------------------------- */
+
+UiMenu::UiMenu(char* label) {
+    this->items = NULL;
+    this->label = label;
+}
+
+void UiMenu::addMenuItem(UiMenuItemI* item) {
+    items = ucx_list_append(items, item);
+}
+
+void UiMenu::addTo(UiObject *obj, QMenuBar *menubar, QMenu *menu) {
+    QMenu *m = NULL;
+    if(menubar) {
+        m = menubar->addMenu(label);
+    } else {
+        m = menu->addMenu(label);
+    }
+    
+    UCX_FOREACH(elm, items) {
+        UiMenuItemI *item = (UiMenuItemI*)elm->data;
+        item->addTo(obj, NULL, m);
+    }
+}
+
+
+/* -------------------------- UiMenuItem -------------------------- */
+
+UiMenuItem::UiMenuItem(char* label, ui_callback f, void* userdata) {
+    this->label = label;
+    this->callback = f;
+    this->userdata = userdata;
+    this->groups = NULL;
+}
+
+void UiMenuItem::addGroup(int group) {
+    groups = ucx_list_append(groups, (void*)(intptr_t)group);
+}
+
+void UiMenuItem::setCheckable(bool c) {
+    checkable = c;
+}
+
+void UiMenuItem::addTo(UiObject *obj, QMenuBar *menubar, QMenu *menu) {
+    QString str = QString::fromUtf8(label);
+    UiAction *action = new UiAction(obj, str, callback, userdata);
+    action->setCheckable(checkable);
+    if(checkable) {
+        action->setChecked(false);
+    }
+    menu->addAction(action);
+    QObject::connect(action, SIGNAL(triggered()), action, SLOT(trigger()));
+}
+
+
+/* -------------------------- UiStMenuItem -------------------------- */
+
+UiStMenuItem::UiStMenuItem(char* stockid, ui_callback f, void* userdata) {
+    this->stockid = stockid;
+    this->callback = f;
+    this->userdata = userdata;
+    this->groups = NULL;
+}
+
+void UiStMenuItem::addGroup(int group) {
+    groups = ucx_list_append(groups, (void*)(intptr_t)group);
+}
+
+void UiStMenuItem::addTo(UiObject *obj, QMenuBar *menubar, QMenu *menu) {
+    UiStockItem *stockItem = ui_get_stock_item(stockid);
+    
+    QString str = QString::fromUtf8(stockItem->label);
+    UiAction *action = new UiAction(obj, str, callback, userdata);
+    action->setIcon(QIcon::fromTheme(stockItem->icon_name));
+    action->setIconVisibleInMenu(true);
+    menu->addAction(action);
+    //UiEventWrapper *ev = new UiEventWrapper(callback, userdata);
+    QObject::connect(action, SIGNAL(triggered()), action, SLOT(trigger()));
+}
+
+
+/* -------------------------- UiMenuSeparator -------------------------- */
+
+void UiMenuSeparator::addTo(UiObject* obj, QMenuBar* menubar, QMenu* menu) {
+    menu->addSeparator();
+}
+
+
+/* -------------------------- UiCheckItemNV -------------------------- */
+
+UiCheckItemNV::UiCheckItemNV(char* label, char* varname) {
+    this->label = label;
+    this->varname = varname;
+}
+
+void UiCheckItemNV::addTo(UiObject* obj, QMenuBar* menubar, QMenu* menu) {
+    QString str = QString::fromUtf8(label);
+    UiAction *action = new UiAction(obj, str, NULL, NULL);
+    action->setCheckable(true);
+    menu->addAction(action);
+    QObject::connect(action, SIGNAL(triggered()), action, SLOT(trigger()));
+    
+    UiVar *var = uic_connect_var(obj->ctx, varname, UI_VAR_INTEGER);
+    if(var) {
+        UiInteger *value = (UiInteger*)var->value;
+        action->setChecked(value->value);
+        value->obj = action;
+        value->get = ui_checkitem_get;
+        value->set = ui_checkitem_set;
+        value = 0;
+    } else {
+        // TODO: error
+    }
+}
+
+
+/* -------------------------- UiAction -------------------------- */
+
+UiAction::UiAction(UiObject *obj, QString &label, ui_callback f, void* userdata) : QAction(label, NULL) {
+    //QAction(label, NULL);
+    this->obj = obj;
+    this->callback = f;
+    this->userdata = userdata;
+}
+
+void UiAction::trigger() {
+    if(!callback) {
+        return;
+    }
+    
+    UiEvent e;
+    e.obj = obj;
+    e.window = obj->window;
+    e.document = obj->ctx->document;
+    e.eventdata = NULL;
+    
+    if(isCheckable()) {
+        e.intval = isChecked();
+    } else {
+        e.intval = 0;
+    }
+    
+    callback(&e, userdata);
+}
+
+
+void ui_menu(char *label) {
+    // free current menu hierarchy
+    ucx_list_free(current);
+    
+    // create menu
+    UiMenu *menu = new UiMenu(label);
+    
+    current = ucx_list_prepend(NULL, menu);
+    menus = ucx_list_append(menus, menu);
+}
+
+void ui_submenu(char *label) {
+    UiMenu *menu = new UiMenu(label);
+    
+    // add submenu to current menu
+    UiMenu *cm = (UiMenu*)current->data;
+    cm->addMenuItem(menu);
+    
+    // set the submenu to current menu
+    current = ucx_list_prepend(current, menu);
+}
+
+void ui_submenu_end() {
+    if(ucx_list_size(current) < 2) {
+        return;
+    }
+    current = ucx_list_remove(current, current);
+    //UcxList *c = current;
+}
+
+
+void ui_menuitem(char *label, ui_callback f, void *userdata) {
+    ui_menuitem_gr(label, f, userdata, -1);
+}
+
+void ui_menuitem_st(char *stockid, ui_callback f, void *userdata) {
+    ui_menuitem_stgr(stockid, f, userdata, -1);
+}
+
+void ui_menuitem_gr(char *label, ui_callback f, void *userdata, ...) {
+    if(!current) {
+        return;
+    }
+    
+    UiMenuItem *item = new UiMenuItem(label, f, userdata);
+    
+    // add groups
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->addGroup(group);
+    }
+    va_end(ap);
+    
+    UiMenu *cm = (UiMenu*)current->data;
+    cm->addMenuItem(item);
+}
+
+void ui_menuitem_stgr(char *stockid, ui_callback f, void *userdata, ...) {
+    if(!current) {
+        return;
+    }
+    
+    UiStMenuItem *item = new UiStMenuItem(stockid, f, userdata);
+    
+    // add groups
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->addGroup(group);
+    }
+    va_end(ap);
+    
+    UiMenu *cm = (UiMenu*)current->data;
+    cm->addMenuItem(item);
+}
+
+void ui_menuseparator() {
+    if(!current) {
+        return;
+    }
+    
+    UiMenuSeparator *item = new UiMenuSeparator();
+    UiMenu *cm = (UiMenu*)current->data;
+    cm->addMenuItem(item);
+}
+
+void ui_checkitem(char *label, ui_callback f, void *userdata) {
+    if(!current) {
+        return;
+    }
+    
+    UiMenuItem *item = new UiMenuItem(label, f, userdata);
+    item->setCheckable(true);
+    
+    UiMenu *cm = (UiMenu*)current->data;
+    cm->addMenuItem(item);
+}
+
+void ui_checkitem_nv(char *label, char *vname) {
+    if(!current) {
+        return;
+    }
+    
+    UiCheckItemNV *item = new UiCheckItemNV(label, vname);
+    
+    UiMenu *cm = (UiMenu*)current->data;
+    cm->addMenuItem(item);
+}
+
+void ui_menuitem_list(UiList *items, ui_callback f, void *userdata) {
+    
+}
+
+void ui_add_menus(UiObject *obj, QMainWindow *window) {
+    QMenuBar *mb = window->menuBar();
+    
+    UCX_FOREACH(elm, menus) {
+        UiMenu *menu = (UiMenu*)elm->data;
+        menu->addTo(obj, mb, NULL);        
+    }
+}
+
+int ui_checkitem_get(UiInteger *i) {
+    QAction *action = (QAction*)i->obj;
+    i->value = action->isChecked();
+    return i->value;
+}
+
+void ui_checkitem_set(UiInteger *i, int value) {
+    QAction *action = (QAction*)i->obj;
+    i->value = value;
+    action->setChecked(value);
+}
+
+
+/*
+ * widget menu functions
+ */
+
+UiContextMenuHandler::UiContextMenuHandler(QWidget *widget, QMenu* menu) {
+    this->widget = widget;
+    this->menu = menu;
+}
+
+void UiContextMenuHandler::contextMenuEvent(const QPoint & pos) {
+    menu->popup(widget->mapToGlobal(pos));
+}
+UIMENU ui_contextmenu(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    return ui_contextmenu_w(obj, ct->current);
+}
+
+UIMENU ui_contextmenu_w(UiObject *obj, UIWIDGET widget) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    QMenu *menu = new QMenu(widget);
+    widget->setContextMenuPolicy(Qt::CustomContextMenu);
+    
+    UiContextMenuHandler *handler = new UiContextMenuHandler(widget, menu);
+    QObject::connect(
+            widget,
+            SIGNAL(customContextMenuRequested(QPoint)),
+            handler,
+            SLOT(contextMenuEvent(QPoint)));
+    
+    ct->menu = menu;
+    
+    return menu;
+}
+
+void ui_contextmenu_popup(UIMENU menu) {
+    
+}
+
+void ui_widget_menuitem(UiObject *obj, char *label, ui_callback f, void *userdata) {
+    ui_widget_menuitem_gr(obj, label, f, userdata, -1);
+}
+
+void ui_widget_menuitem_gr(UiObject *obj, char *label, ui_callback f, void *userdata, ...) {
+    UiContainer *ct = uic_get_current_container(obj);
+    if(!ct->menu) {
+        return;
+    }
+    
+    // add groups
+    UcxList *groups = NULL;
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        ucx_list_append(groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    // create menuitem
+    QString str = QString::fromUtf8(label);
+    UiAction *action = new UiAction(obj, str, f, userdata);
+    ct->menu->addAction(action);
+    QObject::connect(action, SIGNAL(triggered()), action, SLOT(trigger()));
+}
+
+void ui_widget_menuitem_st(UiObject *obj, char *stockid, ui_callback f, void *userdata) {
+    ui_widget_menuitem_stgr(obj, stockid, f, userdata, -1);
+}
+
+void ui_widget_menuitem_stgr(UiObject *obj, char *stockid, ui_callback f, void *userdata, ...) {
+    UiContainer *ct = uic_get_current_container(obj);
+    if(!ct->menu) {
+        return;
+    }
+    
+    // add groups
+    UcxList *groups = NULL;
+    va_list ap;
+    va_start(ap, userdata);
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        ucx_list_append(groups, (void*)(intptr_t)group);
+    }
+    va_end(ap);
+    
+    // create menuitem
+    UiStockItem *stockItem = ui_get_stock_item(stockid);
+    
+    QString str = QString::fromUtf8(stockItem->label);
+    UiAction *action = new UiAction(obj, str, f, userdata);
+    action->setIcon(QIcon::fromTheme(stockItem->icon_name));
+    action->setIconVisibleInMenu(true);
+    ct->menu->addAction(action);
+    QObject::connect(action, SIGNAL(triggered()), action, SLOT(trigger()));
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/menu.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,134 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef MENU_H
+#define	MENU_H
+
+#include "../ui/menu.h"
+#include <ucx/list.h>
+
+#include <QMainWindow>
+#include <QMenu>
+#include <QMenuBar>
+#include <QContextMenuEvent>
+
+class UiMenuItemI {
+public:
+    virtual void addTo(UiObject *obj, QMenuBar *menubar, QMenu *menu) = 0;
+};
+
+class UiMenu : public UiMenuItemI {
+public:
+    
+    UcxList *items;
+    char *label;
+    
+    UiMenu(char *label);
+    
+    void addMenuItem(UiMenuItemI *item);
+    
+    virtual void addTo(UiObject *obj, QMenuBar *menubar, QMenu *menu);
+};
+
+class UiMenuItem : public UiMenuItemI {
+    char *label;
+    ui_callback callback;
+    void *userdata;
+    UcxList *groups;
+    bool checkable = false;
+    
+public:
+    UiMenuItem(char *label, ui_callback f, void *userdata);
+    void addGroup(int group);
+    void setCheckable(bool c);
+    
+    virtual void addTo(UiObject *obj, QMenuBar *menubar, QMenu *menu);
+};
+
+class UiStMenuItem : public UiMenuItemI {
+    char *stockid;
+    ui_callback callback;
+    void *userdata;
+    UcxList *groups;
+    
+public:
+    UiStMenuItem(char *stockid, ui_callback f, void *userdata);
+    void addGroup(int group);
+    
+    virtual void addTo(UiObject *obj, QMenuBar *menubar, QMenu *menu);
+};
+
+class UiMenuSeparator : public UiMenuItemI {
+public:
+    virtual void addTo(UiObject *obj, QMenuBar *menubar, QMenu *menu);
+};
+
+class UiCheckItemNV : public UiMenuItemI {
+    char *label;
+    char *varname;
+    
+public:
+    UiCheckItemNV(char *label, char *varname);
+    virtual void addTo(UiObject *obj, QMenuBar *menubar, QMenu *menu);
+};
+
+
+class UiAction : public QAction {
+    Q_OBJECT
+    
+    UiObject *obj;
+    ui_callback callback;
+    void *userdata;
+    
+public:
+    UiAction(UiObject *obj, QString &label, ui_callback f, void *userdata);
+
+private slots:
+    void trigger();
+};
+
+void ui_add_menus(UiObject *obj, QMainWindow *window);
+
+extern "C" int ui_checkitem_get(UiInteger *i);
+extern "C" void ui_checkitem_set(UiInteger *i, int value);
+
+class UiContextMenuHandler : public QObject {
+    Q_OBJECT
+    
+    QWidget *widget;
+    QMenu *menu;
+    
+public:
+    UiContextMenuHandler(QWidget *widget, QMenu *menu);
+    
+public slots:
+    void contextMenuEvent(const QPoint & pos);
+};
+
+#endif	/* MENU_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/model.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,170 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "model.h"
+
+UiListSelection* listSelection(QItemSelectionModel *s) {
+    UiListSelection *selection = new UiListSelection();
+    
+    QModelIndexList list = s->selectedRows();
+    selection->count = list.count();
+    if(selection->count > 0) {
+        selection->rows = new int[selection->count];
+    }
+    
+    QModelIndex index;
+    int i=0;
+    foreach(index, list) {
+        selection->rows[i] = index.row();
+        i++;
+    }
+    return selection;
+}
+
+ListModel::ListModel(UiObject* obj, QListView* view, UiListPtr* list, ui_model_getvalue_f getvalue, ui_callback f, void* userdata) {
+    this->obj = obj;
+    this->view = view;
+    this->list = list;
+    this->getvalue = getvalue;
+    this->callback = f;
+    this->userdata = userdata;
+}
+
+int ListModel::rowCount(const QModelIndex& parent) const {
+    return list->list->count(list->list);
+}
+
+QVariant ListModel::data(const QModelIndex &index, int role) const {
+    if(role == Qt::DisplayRole) {
+        UiList *ls = list->list;
+        void *rowData = ls->get(ls, index.row());
+        if(rowData && getvalue) {
+            void *value = getvalue(rowData, 0);
+            return QString::fromUtf8((char*)value); 
+        }
+    }
+    return QVariant();
+}
+
+void ListModel::selectionChanged(const QItemSelection& selected, const QItemSelection& deselected) {
+    UiListSelection *selection = listSelection(view->selectionModel());
+    
+    UiEvent e;
+    e.obj = obj;
+    e.window = obj->window;
+    e.document = obj->ctx->document;
+    e.eventdata = selection;
+    e.intval = selection->count > 0 ? selection->rows[0] : -1;
+    callback(&e, userdata);
+    
+    if(selection->count > 0) {
+        delete selection->rows;
+    }
+    delete selection;
+}
+
+TableModel::TableModel(UiObject *obj, QTreeView *view, UiListPtr *list, UiModelInfo *info) {
+    this->obj = obj;
+    this->list = list;
+    this->info = info;
+    this->view = view;
+}
+
+int TableModel::rowCount(const QModelIndex &parent) const {
+    return list->list->count(list->list);
+}
+
+int TableModel::columnCount(const QModelIndex &parent) const {
+    return info->columns;
+}
+
+QVariant TableModel::data(const QModelIndex &index, int role) const {
+    if(role == Qt::DisplayRole) {
+        UiList *ls = list->list;
+        void *rowData = ls->get(ls, index.row());
+        if(rowData && info->getvalue) {
+            void *value = info->getvalue(rowData, index.column());
+            switch(info->types[index.column()]) {
+                case UI_STRING: {
+                    return QString::fromUtf8((char*)value); 
+                }
+                case UI_INTEGER: {
+                    int *intptr = (int*)value;
+                    return QVariant(*intptr);
+                }
+            }
+        }
+    }
+    return QVariant();
+}
+
+QVariant TableModel::headerData(int section, Qt::Orientation orientation, int role) const {
+    if(role == Qt::DisplayRole) {
+        char *label = info->titles[section];
+        return QString::fromUtf8(label);
+    }
+    return QVariant();
+}
+
+void TableModel::update() {
+    emit dataChanged(QModelIndex(),QModelIndex());
+}
+
+void TableModel::selectionChanged(const QItemSelection& selected, const QItemSelection& deselected) {
+    UiListSelection *selection = listSelection(view->selectionModel());
+    
+    UiEvent e;
+    e.obj = obj;
+    e.window = obj->window;
+    e.document = obj->ctx->document;
+    e.eventdata = selection;
+    e.intval = selection->count > 0 ? selection->rows[0] : -1;
+    info->selection(&e, info->userdata);
+    
+    if(selection->count > 0) {
+        delete selection->rows;
+    }
+    delete selection;
+}
+
+void TableModel::activate(const QModelIndex &) {
+    UiListSelection *selection = listSelection(view->selectionModel());
+    
+    UiEvent e;
+    e.obj = obj;
+    e.window = obj->window;
+    e.document = obj->ctx->document;
+    e.eventdata = selection;
+    e.intval = selection->count > 0 ? selection->rows[0] : -1;
+    info->activate(&e, info->userdata);
+    
+    if(selection->count > 0) {
+        delete selection->rows;
+    }
+    delete selection;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/model.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,91 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef MODEL_H
+#define	MODEL_H
+
+#include "toolkit.h"
+#include "../ui/tree.h"
+#include "../common/context.h"
+#include <QListView>
+#include <QTreeView>
+#include <QAbstractListModel>
+#include <QAbstractTableModel>
+#include <QAbstractItemModel>
+#include <QItemSelectionModel>
+
+class ListModel : public QAbstractListModel {
+    Q_OBJECT
+    
+    UiObject    *obj;
+    UiListPtr   *list;
+    ui_model_getvalue_f getvalue;
+    ui_callback callback;
+    void        *userdata;
+    QListView   *view;
+    
+public:
+    ListModel(UiObject *obj, QListView *view, UiListPtr *list, ui_model_getvalue_f getvalue, ui_callback f, void *userdata);
+    
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+    
+public slots:
+    void selectionChanged(
+        const QItemSelection & selected,
+        const QItemSelection & deselected);
+};
+
+class TableModel : public QAbstractTableModel {
+    Q_OBJECT
+    
+    UiObject    *obj;
+    UiListPtr   *list;
+    UiModelInfo *info;
+    QTreeView   *view;
+public:
+    TableModel(UiObject *obj, QTreeView *view, UiListPtr *list, UiModelInfo *info);
+    
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+    QVariant headerData(int section, Qt::Orientation orientation, int role) const;
+    
+    void update();
+    
+public slots:
+    void selectionChanged(
+        const QItemSelection & selected,
+        const QItemSelection & deselected);
+    void activate(const QModelIndex &);
+};
+
+UiListSelection* listSelection(QItemSelectionModel *s);
+
+#endif	/* MODEL_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/objs.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,36 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2012 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+QT_SRC_DIR = ui/qt/
+QT_OBJPRE = $(OBJ_DIR)/$(QT_SRC_DIR)
+
+#QTOBJ = 
+
+TOOLKITOBJS += $(QTOBJ:%=$(QT_OBJPRE)%)
+TOOLKITSOURCE += $(QTOBJ:%.o=qt/%.cpp)
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/qt4.pro	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,63 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2014 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+TARGET = uitk
+TEMPLATE = lib
+CONFIG += staticlib warn_off debug
+DESTDIR = ../build/lib
+MOC_DIR = ../build/ui/qt
+OBJECTS_DIR = ../build/ui/qt
+
+DEFINES += UI_QT4
+
+SOURCES += toolkit.cpp
+SOURCES += window.cpp
+SOURCES += menu.cpp
+SOURCES += toolbar.cpp
+SOURCES += stock.cpp
+SOURCES += container.cpp
+SOURCES += text.cpp
+SOURCES += model.cpp
+SOURCES += tree.cpp
+SOURCES += button.cpp
+SOURCES += label.cpp
+SOURCES += graphics.cpp
+
+HEADERS += toolkit.h
+HEADERS += window.h
+HEADERS += menu.h
+HEADERS += toolbar.h
+HEADERS += stock.h
+HEADERS += container.h
+HEADERS += text.h
+HEADERS += model.h
+HEADERS += tree.h
+HEADERS += button.h
+HEADERS += label.h
+HEADERS += graphics.h
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/stock.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,77 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <ucx/map.h>
+
+#include "stock.h"
+#include "../ui/properties.h"
+
+static UcxMap *stock_items;
+
+void ui_stock_init() {
+    stock_items = ucx_map_new(64);
+    
+    ui_add_stock_item(UI_STOCK_NEW, "New", "document-new");
+    ui_add_stock_item(UI_STOCK_OPEN, "Open", "document-open");
+    ui_add_stock_item(UI_STOCK_SAVE, "Save", "document-save");
+    ui_add_stock_item(UI_STOCK_SAVE_AS, "Save as ...", "document-save-as");
+    ui_add_stock_item(UI_STOCK_REVERT_TO_SAVED, "Revert to saved", "document-revert");
+    ui_add_stock_item(UI_STOCK_CLOSE, "Close", "window-close");
+    ui_add_stock_item(UI_STOCK_UNDO, "Undo", "edit-undo");
+    ui_add_stock_item(UI_STOCK_REDO, "Redo", "edit-redo");
+    ui_add_stock_item(UI_STOCK_GO_BACK, "Back", "go-previous");
+    ui_add_stock_item(UI_STOCK_GO_FORWARD, "Forward", "go-next");
+    ui_add_stock_item(UI_STOCK_CUT, "Cut", "edit-cut");
+    ui_add_stock_item(UI_STOCK_COPY, "Copy", "edit-copy");
+    ui_add_stock_item(UI_STOCK_PASTE, "Paste", "edit-paste");
+    ui_add_stock_item(UI_STOCK_DELETE, "Delete", "edit-delete");
+}
+
+void ui_add_stock_item(char *id, char *label, char *icon) {
+    UiStockItem *item = new UiStockItem(label, icon);
+    ucx_map_cstr_put(stock_items, id, item);
+}
+
+UiStockItem* ui_get_stock_item(char *id) {
+    UiStockItem *item = (UiStockItem*)ucx_map_cstr_get(stock_items, id);
+    if(item) {
+        char *label = uistr_n(id);
+        if(label) {
+            item->label = label;
+        }
+    }
+    return item;
+}
+
+
+UiStockItem::UiStockItem(char* label, char* icon_name) {
+    this->label = label;
+    this->icon_name = icon_name;
+}
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/stock.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,49 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef STOCK_H
+#define	STOCK_H
+
+#include "../ui/stock.h"
+
+class UiStockItem {
+public:
+        
+    char *label;
+    char *icon_name;
+    
+    UiStockItem(char *label, char *icon_name);
+};
+
+
+void ui_stock_init();
+void ui_add_stock_item(char *id, char *label, char *icon);
+UiStockItem* ui_get_stock_item(char *id);
+
+#endif	/* STOCK_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/text.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,195 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "text.h"
+#include "container.h"
+
+#include "../common/context.h"
+#include "../common/document.h"
+
+UIWIDGET ui_textarea(UiObject *obj, UiText *value) {
+    QTextDocument *txtdoc = value && value->obj ? (QTextDocument*)value->obj : new QTextDocument();
+    
+    if(value) {
+        if(value->value && value->obj) {
+            QString str = QString::fromUtf8(value->value);
+            txtdoc->setPlainText(str);
+        }
+        
+        value->get = ui_textarea_get;
+        value->set = ui_textarea_set;
+        value->getsubstr = ui_textarea_getsubstr;
+        value->insert = ui_textarea_insert;
+        value->setposition = ui_textarea_setposition;
+        value->position = ui_textarea_position;
+        value->selection = ui_textarea_selection;
+        value->length = ui_textarea_length;
+        value->remove = ui_textarea_remove;
+        value->obj = txtdoc;
+        value->value = NULL;
+    }
+    
+    UiContainer *ct = uic_get_current_container(obj); 
+    QTextEdit *textedit = new QTextEdit();
+    textedit->setDocument(txtdoc);
+    ct->add(textedit, true);
+    
+    return textedit;
+}
+
+UIWIDGET ui_textarea_nv(UiObject *obj, char *varname) {
+    UiVar *var = uic_connect_var(obj->ctx, varname, UI_VAR_TEXT);
+    if(var) {
+        UiText *value = (UiText*)var->value;
+        return ui_textarea(obj, value);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+
+char* ui_textarea_get(UiText *text) {
+    if(text->value) {
+        free(text->value);
+    }
+    
+    QTextDocument *doc = (QTextDocument*)text->obj;
+    QString str = doc->toPlainText();
+    QByteArray array = str.toLocal8Bit();
+    const char *cstr = array.constData();
+    
+    if(text->value) {
+        free(text->value);
+    }
+    text->value = strdup(cstr);
+    return text->value;
+}
+
+void ui_textarea_set(UiText *text, char *str) {
+    // set text
+    QTextDocument *doc = (QTextDocument*)text->obj;
+    QString qstr = QString::fromUtf8(str);
+    doc->setPlainText(qstr);
+    // cleanup
+    if(text->value) {
+        free(text->value);
+    }
+    text->value = NULL;
+}
+
+char* ui_textarea_getsubstr(UiText *text, int begin, int end) {
+    QTextDocument *doc = (QTextDocument*)text->obj;
+    return NULL; // TODO
+}
+
+void ui_textarea_insert(UiText *text, int pos, char *str) {
+    QTextDocument *doc = (QTextDocument*)text->obj;
+}
+
+void ui_textarea_setposition(UiText *text, int pos) {
+    // TODO
+}
+
+int ui_textarea_position(UiText *text) {
+    QTextDocument *doc = (QTextDocument*)text->obj;
+    return 0; // TODO
+}
+
+void ui_textarea_selection(UiText *text, int *begin, int *end) {
+    QTextDocument *doc = (QTextDocument*)text->obj;
+}
+
+int ui_textarea_length(UiText *text) {
+    QTextDocument *doc = (QTextDocument*)text->obj;
+    return 0; // TODO
+}
+
+void ui_textarea_remove(UiText *text, int begin, int end) {
+    QTextDocument *doc = (QTextDocument*)text->obj;
+}
+
+
+/* ------------------- TextField ------------------- */
+
+UIWIDGET ui_textfield(UiObject *obj, UiString *value) {
+    QLineEdit *textfield = new QLineEdit();
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(textfield, false);
+    
+    if(value) {
+        if(value->value) {
+            QString str = QString::fromUtf8(value->value);
+            textfield->setText(str);
+            free(value->value);
+            value->value = NULL;
+        }
+        value->set = ui_textfield_set;
+        value->get = ui_textfield_get;
+        value->obj = textfield;
+    }
+    
+    return textfield;
+}
+
+UIWIDGET ui_textfield_nv(UiObject *obj, char *varname) {
+    UiVar *var = uic_connect_var(obj->ctx, varname, UI_VAR_STRING);
+    if(var) {
+        UiString *value = (UiString*)var->value;
+        return ui_textfield(obj, value);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+char* ui_textfield_get(UiString *str) {
+    QLineEdit *textfield = (QLineEdit*)str->obj;
+    QString qstr = textfield->text();
+    
+    if(str->value) {
+        free(str->value);
+    }
+    QByteArray array = qstr.toLocal8Bit();
+    const char *cstr = array.constData();
+    str->value = strdup(cstr);
+    
+    return str->value;
+}
+
+void ui_textfield_set(UiString *str, char *value) {
+    QLineEdit *textfield = (QLineEdit*)str->obj;
+    QString qstr = QString::fromUtf8(value);
+    textfield->setText(qstr);
+    
+    if(str->value) {
+        free(str->value);
+    }
+    str->value = NULL;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/text.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,56 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TEXT_H
+#define	TEXT_H
+
+#include "toolkit.h"
+#include "../ui/text.h"
+#include <QTextEdit>
+#include <QLineEdit>
+
+// value implementations
+extern "C" {    
+    char* ui_textarea_get(UiText *text);
+    void ui_textarea_set(UiText *text, char *str);
+    char* ui_textarea_getsubstr(UiText *text, int begin, int end);
+    void ui_textarea_insert(UiText *text, int pos, char *str);
+    void ui_textarea_setposition(UiText *text, int pos);
+    int ui_textarea_position(UiText *text);
+    void ui_textarea_selection(UiText *text, int *begin, int *end);
+    int ui_textarea_length(UiText *text);
+    void ui_textarea_remove(UiText *text, int begin, int end);
+    
+    char* ui_textfield_get(UiString *str);
+    void ui_textfield_set(UiString *str, char *value);
+}
+
+
+
+#endif	/* TEXT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/toolbar.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,165 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <ucx/map.h>
+#include <inttypes.h>
+
+#include "toolbar.h"
+#include "menu.h"
+#include "stock.h"
+
+static UcxMap *toolbar_items = ucx_map_new(16);
+static UcxList *defaults;
+
+/* ------------------------- UiToolItem ------------------------- */
+
+UiToolItem::UiToolItem(char *label, ui_callback f, void *userdata) {
+    this->label = label;
+    this->image = NULL;
+    this->callback = f;
+    this->userdata = userdata;
+    this->isimportant = false;
+    this->groups = NULL;
+}
+
+void UiToolItem::addGroup(int group) {
+    groups = ucx_list_append(groups, (void*)(intptr_t)group);
+}
+
+void UiToolItem::addTo(UiObject *obj, QToolBar *toolbar) {
+    QString str = QString::fromUtf8(label);
+    UiAction *action = new UiAction(obj, str, callback, userdata);
+    action->setIcon(QIcon::fromTheme(image));
+    toolbar->addAction(action);
+    QObject::connect(action, SIGNAL(triggered()), action, SLOT(trigger()));
+}
+
+
+/* ------------------------- UiStockToolItem ------------------------- */
+
+UiStockToolItem::UiStockToolItem(char *stockid, ui_callback f, void *userdata) {
+    this->stockid = stockid;
+    this->callback = f;
+    this->userdata = userdata;
+    this->isimportant = false;
+    this->groups = NULL;
+}
+
+void UiStockToolItem::addGroup(int group) {
+    groups = ucx_list_append(groups, (void*)(intptr_t)group);
+}
+
+void UiStockToolItem::addTo(UiObject *obj, QToolBar *toolbar) {
+    UiStockItem *stockItem = ui_get_stock_item(stockid);
+    QString str = QString::fromUtf8(stockItem->label);
+    
+    UiAction *action = new UiAction(obj, str, callback, userdata);
+    action->setIcon(QIcon::fromTheme(stockItem->icon_name));
+    toolbar->addAction(action);
+    QObject::connect(action, SIGNAL(triggered()), action, SLOT(trigger()));
+}
+
+
+
+void ui_toolitem_vstgr(
+        char *name,
+        char *stockid,
+        int isimportant,
+        ui_callback f,
+        void *userdata,
+        va_list ap)
+{
+    UiStockToolItem *item = new UiStockToolItem(stockid, f, userdata);
+    item->isimportant = isimportant;
+    
+    // add groups
+    int group;
+    while((group = va_arg(ap, int)) != -1) {
+        item->addGroup(group);
+    }
+    
+    ucx_map_cstr_put(toolbar_items, name, item);
+}
+
+void ui_toolitem_img(char *name, char *label, char *img, ui_callback f, void *udata) {
+    UiToolItem *item = new UiToolItem(label, f, udata);
+    item->image = img;
+    item->isimportant = false;
+    
+    ucx_map_cstr_put(toolbar_items, name, item);
+}
+
+void ui_toolitem(char *name, char *label, ui_callback f, void *udata) {
+    ui_toolitem_img(name, label, NULL, f, udata);
+}
+
+void ui_toolitem_st(char *name, char *stockid, ui_callback f, void *userdata) {
+    ui_toolitem_stgr(name, stockid, f, userdata, -1);
+}
+
+void ui_toolitem_sti(char *name, char *stockid, ui_callback f, void *userdata) {
+    ui_toolitem_stgri(name, stockid, f, userdata, -1);
+}
+
+void ui_toolitem_stgr(char *name, char *stockid, ui_callback f, void *userdata, ...) {
+    va_list ap;
+    va_start(ap, userdata);
+    ui_toolitem_vstgr(name, stockid, 0, f, userdata, ap);
+    va_end(ap);
+}
+
+void ui_toolitem_stgri(char *name, char *stockid, ui_callback f, void *userdata, ...) {
+    va_list ap;
+    va_start(ap, userdata);
+    ui_toolitem_vstgr(name, stockid, 1, f, userdata, ap);
+    va_end(ap);
+}
+
+
+void ui_toolbar_add_default(char *name) {
+    char *s = strdup(name);
+    defaults = ucx_list_append(defaults, s);
+}
+
+
+QToolBar* ui_create_toolbar(UiObject *obj) {
+    QToolBar *toolbar = new QToolBar();
+    
+    UCX_FOREACH(elm, defaults) {
+        UiToolItemI *item = (UiToolItemI*)ucx_map_cstr_get(toolbar_items, (char*)elm->data);
+        if(item) {
+            item->addTo(obj, toolbar);
+        } else if(!strcmp((char*)elm->data, "@separator")) {
+            
+        } else {
+            fprintf(stderr, "UI Error: Unknown toolbar item: %s\n", elm->data);
+        }
+    }
+    
+    return toolbar;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/toolbar.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,83 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TOOLBAR_H
+#define	TOOLBAR_H
+
+#include "toolkit.h"
+#include "../ui/toolbar.h"
+#include <ucx/list.h>
+#include <QToolBar>
+
+class UiToolItemI {
+public:
+    virtual void addTo(UiObject *obj, QToolBar *toolbar) = 0;
+};
+
+class UiToolItem : public UiToolItemI {
+public:
+    char *label;
+    char *image;
+    ui_callback callback;
+    void *userdata;
+    UcxList *groups;
+    bool isimportant;
+    
+    UiToolItem(char *label, ui_callback f, void *userdata);
+    void addGroup(int group);
+    virtual void addTo(UiObject *obj, QToolBar *toolbar);
+};
+
+class UiStockToolItem : public UiToolItemI {
+public:
+    char *stockid;
+    ui_callback callback;
+    void *userdata;
+    UcxList *groups;
+    bool isimportant;
+    
+    UiStockToolItem(char *stockid, ui_callback f, void *userdata);
+    void addGroup(int group);
+    virtual void addTo(UiObject *obj, QToolBar *toolbar);
+};
+
+
+void ui_toolitem_vstgr(
+        char *name,
+        char *stockid,
+        int isimportant,
+        ui_callback f,
+        void *userdata,
+        va_list ap);
+
+
+QToolBar* ui_create_toolbar(UiObject *obj);
+
+
+#endif	/* TOOLBAR_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/toolkit.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,121 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "toolkit.h"
+#include "window.h"
+#include "stock.h"
+
+#include "../common/document.h"
+#include "../common/properties.h"
+
+static char *application_name;
+
+static ui_callback appclose_fnc;
+static void *appclose_udata;
+
+//static QApplication app(qargc, qargv);
+int app_argc;
+char **app_argv;
+QApplication *application = NULL;
+
+void ui_init(char *appname, int argc, char **argv) {
+    application_name = appname;
+    
+    app_argc = argc;
+    app_argv = argv;
+    application = new QApplication(app_argc, app_argv);
+    
+    uic_docmgr_init();
+    
+    uic_load_app_properties();
+    
+    ui_stock_init();
+}
+
+char* ui_appname() {
+    return application_name;
+}
+
+void ui_exitfunc(ui_callback f, void *udata) {
+    appclose_fnc = f;
+    appclose_udata = udata;
+}
+
+void ui_openfilefunc(ui_callback f, void *userdata) {
+    // OS X only
+}
+
+void ui_main() {
+    application->exec();
+    
+    if(appclose_fnc) {
+        appclose_fnc(NULL, appclose_udata);
+    }
+    uic_store_app_properties();
+    
+    delete application;
+}
+
+void ui_show(UiObject *obj) {
+    obj->widget->show();
+}
+
+void ui_close(UiObject *obj) {
+    QMainWindow *window = (QMainWindow*)obj->widget;
+    window->close();
+}
+
+void ui_set_enabled(UIWIDGET widget, int enabled) {
+    
+}
+
+void ui_set_visible(UIWIDGET widget, int visible) {
+    
+}
+
+
+
+
+UiEventWrapper::UiEventWrapper(UiObject *obj, ui_callback f, void* userdata) {
+    this->obj = obj;
+    this->callback = f;
+    this->userdata = userdata;
+}
+
+void UiEventWrapper::slot() {
+    UiEvent e;
+    e.obj = obj;
+    e.window = obj->window;
+    e.document = obj->ctx->document;
+    e.eventdata = NULL;
+    e.intval = 0;
+    callback(&e, userdata);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/toolkit.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,54 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TOOLKIT_H
+#define	TOOLKIT_H
+
+#include "../ui/toolkit.h"
+#include "../common/context.h"
+#include "../common/object.h"
+
+#include <QApplication>
+
+class UiEventWrapper : public QObject {
+    Q_OBJECT
+    
+    UiObject *obj;
+    ui_callback callback;
+    void *userdata;
+
+public:
+    UiEventWrapper(UiObject *obj, ui_callback f, void *userdata);
+    
+public slots:
+    void slot();
+};
+
+
+#endif	/* TOOLKIT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/tree.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,142 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tree.h"
+#include "container.h"
+
+#include <QTreeView>
+#include <QTreeWidgetItem>
+#include <QListView>
+
+
+extern "C" void* ui_strmodel_getvalue(void *elm, int column) {
+    return column == 0 ? elm : NULL;
+}
+
+UIWIDGET ui_listview_str(UiObject *obj, UiList *list, ui_callback f, void *udata) {
+    return ui_listview(obj, list, ui_strmodel_getvalue, f, udata);
+}
+UIWIDGET ui_listview_var(UiObject *obj, UiListPtr *list, ui_model_getvalue_f getvalue, ui_callback f, void *udata) {
+    QListView *view = new QListView();
+    ListModel *model = new ListModel(obj, view, list, getvalue, f, udata);
+    view->setModel(model);
+    
+    // TODO: observer update
+    
+    QItemSelectionModel *s = view->selectionModel();
+    QObject::connect(
+            s,
+            SIGNAL(selectionChanged(const QItemSelection &, const QItemSelection &)),
+            model,
+            SLOT(selectionChanged(const QItemSelection &, const QItemSelection &)));
+    
+    UiContainer *ct = uic_get_current_container(obj); 
+    ct->add(view, true);
+    return view;
+}
+
+UIWIDGET ui_listview(UiObject *obj, UiList *list, ui_model_getvalue_f getvalue, ui_callback f, void *udata) {
+    UiListPtr *listptr = (UiListPtr*)ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiListPtr));
+    listptr->list = list;
+    return ui_listview_var(obj, listptr, getvalue, f, udata);
+}
+
+UIWIDGET ui_listview_nv(UiObject *obj, char *varname, ui_model_getvalue_f getvalue, ui_callback f, void *udata) {
+    UiVar *var = uic_connect_var(obj->ctx, varname, UI_VAR_LIST);
+    if(var) {
+        UiListVar *value = (UiListVar*)var->value;
+        return ui_listview_var(obj, value->listptr, getvalue, f, udata);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+
+UIWIDGET ui_table_var(UiObject *obj, UiListPtr *list, UiModelInfo *modelinfo) {
+    QTreeView *view = new QTreeView();
+    TableModel *model = new TableModel(obj, view, list, modelinfo);
+    view->setModel(model);
+    
+    view->setItemsExpandable(false);
+    view->setRootIsDecorated(false);   
+    
+    // TODO: observer update
+    UiTableView *u = new UiTableView();
+    u->widget = view;
+    u->model = model;
+    list->list->observers = ui_add_observer(
+            list->list->observers,
+            (ui_callback)ui_table_update,
+            u);
+    
+    view->setSelectionMode(QAbstractItemView::ExtendedSelection);
+    QItemSelectionModel *s = view->selectionModel();
+    QObject::connect(
+            s,
+            SIGNAL(selectionChanged(const QItemSelection &, const QItemSelection &)),
+            model,
+            SLOT(selectionChanged(const QItemSelection &, const QItemSelection &)));
+    QObject::connect(
+            view,
+            SIGNAL(doubleClicked(const QModelIndex &)),
+            model,
+            SLOT(activate(const QModelIndex &)));
+    
+    
+    UiContainer *ct = uic_get_current_container(obj); 
+    ct->add(view, true);
+    return view;
+}
+
+void ui_table_update(UiEvent *event, UiTableView *view) {
+    // TODO
+    printf("update\n");
+    
+    //view->model->update();
+    view->widget->setModel(NULL);
+    view->widget->setModel(view->model);
+}
+
+UIWIDGET ui_table(UiObject *obj, UiList *list, UiModelInfo *modelinfo) {
+    UiListPtr *listptr = (UiListPtr*)ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiListPtr));
+    listptr->list = list;
+    return ui_table_var(obj, listptr, modelinfo);
+}
+
+UIWIDGET ui_table_nv(UiObject *obj, char *varname, UiModelInfo *modelinfo) {
+    UiVar *var = uic_connect_var(obj->ctx, varname, UI_VAR_LIST);
+    if(var) {
+        UiListVar *value = (UiListVar*)var->value;
+        return ui_table_var(obj, value->listptr, modelinfo);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/tree.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,46 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TREE_H
+#define	TREE_H
+
+#include "../ui/tree.h"
+#include "model.h"
+
+#include <QTableView>
+
+class UiTableView {
+public:
+    QTreeView *widget;
+    TableModel *model;
+};
+
+extern "C" void ui_table_update(UiEvent *event, UiTableView *view);
+
+#endif	/* TREE_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/window.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,95 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <ucx/mempool.h>
+#include "../common/context.h"
+
+#include "window.h"
+#include "menu.h"
+#include "toolbar.h"
+#include "container.h"
+
+#include <QVBoxLayout>
+#include <QFileDialog>
+
+static UiObject* create_window(char *title, void *window_data, bool simple) {
+    UcxMempool *mp = ucx_mempool_new(256);
+    UiObject *obj = (UiObject*)ucx_mempool_calloc(mp, 1, sizeof(UiObject));
+    obj->ctx = uic_context(obj, mp);
+    obj->window = window_data;
+    obj->next = NULL;
+    
+    QMainWindow *window = new QMainWindow();
+    obj->widget = window;
+    
+    if(!simple) {
+        ui_add_menus(obj, window);
+        QToolBar *toolbar = ui_create_toolbar(obj);
+        window->addToolBar(Qt::TopToolBarArea, toolbar);
+    }
+    
+    QBoxLayout *box = new QVBoxLayout();
+    QWidget *boxWidget = new QWidget();
+    boxWidget->setLayout(box);
+    window->setCentralWidget(boxWidget);
+    obj->container = new UiBoxContainer(box);
+    
+    obj->widget = window;
+    return obj;
+}
+
+UiObject* ui_window(char *title, void *window_data) {
+    return create_window(title, window_data, FALSE);
+}
+
+UiObject* ui_simplewindow(char *title, void *window_data) {
+    return create_window(title, window_data, TRUE);
+}
+
+
+char* ui_openfiledialog(UiObject *obj) {
+    QString fileName = QFileDialog::getOpenFileName(obj->widget);
+    if(fileName.size() > 0) {
+        QByteArray array = fileName.toLocal8Bit();
+        const char *cstr = array.constData();
+        return strdup(cstr);
+    } else {
+        return NULL;
+    }
+}
+
+char* ui_savefiledialog(UiObject *obj) {
+    QString fileName = QFileDialog::getSaveFileName(obj->widget);
+    if(fileName.size() > 0) {
+        QByteArray array = fileName.toLocal8Bit();
+        const char *cstr = array.constData();
+        return strdup(cstr);
+    } else {
+        return NULL;
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/qt/window.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,39 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef WINDOW_H
+#define	WINDOW_H
+
+#include "../ui/window.h"
+
+#include <QMainWindow>
+
+
+
+#endif	/* WINDOW_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/button.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,52 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_BUTTON_H
+#define	UI_BUTTON_H
+
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+    
+UIWIDGET ui_button(UiObject *obj, char *label, ui_callback f, void *data);
+
+UIWIDGET ui_checkbox(UiObject *obj, char *label, UiInteger *value);
+UIWIDGET ui_checkbox_nv(UiObject *obj, char *label, char *varname);
+
+UIWIDGET ui_radiobutton(UiObject *obj, char *label, UiInteger *rgroup);
+UIWIDGET ui_radiobutton_nv(UiObject *obj, char *label, char *varname);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UI_BUTTON_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/container.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,92 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_CONTAINER_H
+#define UI_CONTAINER_H
+
+#include "toolkit.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    
+#define UI_CTN(obj, ctn) for(ctn;ui_container_finish(obj);ui_container_begin_close(obj))
+#define UI_VBOX(obj) for(ui_vbox(obj);ui_container_finish(obj);ui_container_begin_close(obj))
+#define UI_HBOX(obj) for(ui_hbox(obj);ui_container_finish(obj);ui_container_begin_close(obj))
+#define UI_VBOX_SP(obj, margin, spacing) for(ui_vbox_sp(obj,margin,spacing);ui_container_finish(obj);ui_container_begin_close(obj))
+#define UI_HBOX_SP(obj, margin, spacing) for(ui_hbox_sp(obj,margin,spacing);ui_container_finish(obj);ui_container_begin_close(obj))
+#define UI_GRID(obj) for(ui_grid(obj);ui_container_finish(obj);ui_container_begin_close(obj))
+#define UI_GRID_SP(obj, margin, columnspacing, rowspacing) for(ui_grid_sp(obj,margin,columnspacing,rowspacing);ui_container_finish(obj);ui_container_begin_close(obj))
+    
+void ui_end(UiObject *obj);
+    
+UIWIDGET ui_vbox(UiObject *obj);
+UIWIDGET ui_hbox(UiObject *obj);
+UIWIDGET ui_vbox_sp(UiObject *obj, int margin, int spacing);
+UIWIDGET ui_hbox_sp(UiObject *obj, int margin, int spacing);
+
+UIWIDGET ui_grid(UiObject *obj);
+UIWIDGET ui_grid_sp(UiObject *obj, int margin, int columnspacing, int rowspacing);
+
+UIWIDGET ui_scrolledwindow(UiObject *obj);
+
+UIWIDGET ui_sidebar(UiObject *obj);
+
+UIWIDGET ui_hsplitpane(UiObject *obj, int max);
+UIWIDGET ui_vsplitpane(UiObject *obj, int max);
+
+UIWIDGET ui_tabview(UiObject *obj);
+void ui_tab(UiObject *obj, char *title);
+void ui_select_tab(UIWIDGET tabview, int tab);
+
+// box container layout functions
+void ui_layout_fill(UiObject *obj, UiBool fill);
+// grid container layout functions
+void ui_layout_hexpand(UiObject *obj, UiBool expand);
+void ui_layout_vexpand(UiObject *obj, UiBool expand);
+void ui_layout_width(UiObject *obj, int width);
+void ui_layout_gridwidth(UiObject *obj, int width);
+void ui_newline(UiObject *obj);
+
+
+UiTabbedPane* ui_tabbed_document_view(UiObject *obj);
+
+UiObject* ui_document_tab(UiTabbedPane *view);
+
+
+/* used for macro */
+void ui_container_begin_close(UiObject *obj);
+int ui_container_finish(UiObject *obj);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UI_CONTAINER_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/display.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,59 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * display widgets without user input
+ */
+
+#ifndef UI_DISPLAY_H
+#define UI_DISPLAY_H
+
+#include "toolkit.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    
+/* label widgets */
+UIWIDGET ui_label(UiObject *obj, char *label);
+UIWIDGET ui_llabel(UiObject *obj, char *label);
+UIWIDGET ui_rlabel(UiObject *obj, char *label);
+UIWIDGET ui_space(UiObject *obj);
+UIWIDGET ui_separator(UiObject *obj);
+
+/* progress bar */
+UIWIDGET ui_progressbar(UiObject *obj, UiDouble *value);
+UIWIDGET ui_progressbar_nv(UiObject *obj, char *varname);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UI_DISPLAY_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/dnd.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,52 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_DND_H
+#define UI_DND_H
+
+#include "toolkit.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    
+#define UI_DND_FILE_TARGET "XdndDirectSave0"
+    
+void ui_selection_settext(UiSelection *sel, char *str, int len);
+void ui_selection_seturis(UiSelection *sel, char **uris, int nelm);
+
+char* ui_selection_gettext(UiSelection *sel);
+char** ui_selection_geturis(UiSelection *sel, size_t *nelm);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UI_DND_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/entry.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,54 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_ENTRY_H
+#define UI_ENTRY_H
+
+#include "toolkit.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+UIWIDGET ui_spinner(UiObject *obj, int step, UiInteger *i);
+UIWIDGET ui_spinnerf(UiObject *obj, double step, int digits, UiDouble *d);
+UIWIDGET ui_spinnerr(UiObject *obj, UiRange *r);
+
+UIWIDGET ui_spinner_nv(UiObject *obj, int step, char *varname);
+UIWIDGET ui_spinnerf_nv(UiObject *obj, double step, int digits, char *varname);
+UIWIDGET ui_spinnerr_nv(UiObject *obj, char *varname);
+
+void ui_spinner_setrange(UIWIDGET spinner, double min, double max);
+void ui_spinner_setdigits(UIWIDGET spinner, int digits);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UI_ENTRY_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/graphics.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,73 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_GRAPHICS_H
+#define	UI_GRAPHICS_H
+
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiGraphics      UiGraphics;
+typedef struct UiTextLayout    UiTextLayout;
+
+typedef void(*ui_drawfunc)(UiEvent*, UiGraphics*, void*);
+
+struct UiGraphics {
+    int width;
+    int height;
+};
+
+UIWIDGET ui_drawingarea(UiObject *obj, ui_drawfunc f, void *userdata);
+void ui_drawingarea_mousehandler(UiObject *obj, UIWIDGET widget, ui_callback f, void *u);
+void ui_drawingarea_getsize(UIWIDGET drawingarea, int *width, int *height);
+void ui_drawingarea_redraw(UIWIDGET drawingarea);
+
+// text layout
+UiTextLayout* ui_text(UiGraphics *g);
+void ui_text_free(UiTextLayout *text);
+void ui_text_setstring(UiTextLayout *layout, char *str);
+void ui_text_setstringl(UiTextLayout *layout, char *str, int len);
+void ui_text_setfont(UiTextLayout *layout, char *font, int size);
+void ui_text_getsize(UiTextLayout *layout, int *width, int *height);
+void ui_text_setwidth(UiTextLayout *layout, int width);
+
+// drawing functions
+void ui_graphics_color(UiGraphics *g, int red, int green, int blue);
+void ui_draw_line(UiGraphics *g, int x1, int y1, int x2, int y2);
+void ui_draw_rect(UiGraphics *g, int x, int y, int w, int h, int fill);
+void ui_draw_text(UiGraphics *g, int x, int y, UiTextLayout *text);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UI_GRAPHICS_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/image.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,54 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_IMAGE_H
+#define UI_IMAGE_H
+
+#include "toolkit.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+UiIcon* ui_icon(const char *name, int size);
+UiIcon* ui_icon_unscaled(const char *name, int size);
+void ui_free_icon(UiIcon *icon);
+
+UiImage* ui_icon_image(UiIcon *icon);
+UiImage* ui_image(const char *filename);
+UiImage* ui_named_image(const char *filename, const char *name);
+UiImage* ui_load_image_from_path(const char *path, const char *name);
+void ui_free_image(UiImage *img);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UI_IMAGE_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/menu.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,74 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_MENU_H
+#define	UI_MENU_H
+
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+ * application menu functions
+ */
+void ui_menu(char *label);
+void ui_submenu(char *label);
+void ui_submenu_end();
+
+void ui_menuitem(char *label, ui_callback f, void *userdata);
+void ui_menuitem_st(char *stockid, ui_callback f, void *userdata);
+void ui_menuitem_gr(char *label, ui_callback f, void *userdata, ...);
+void ui_menuitem_stgr(char *stockid, ui_callback f, void *userdata, ...);
+
+void ui_menuseparator();
+
+void ui_checkitem(char *label, ui_callback f, void *userdata);
+void ui_checkitem_nv(char *label, char *vname);
+
+void ui_menuitem_list(UiList *items, ui_callback f, void *userdata);
+
+/*
+ * widget menu functions
+ */
+UIMENU ui_contextmenu(UiObject *obj);
+UIMENU ui_contextmenu_w(UiObject *obj, UIWIDGET widget);
+void ui_contextmenu_popup(UIMENU menu);
+
+void ui_widget_menuitem(UiObject *obj, char *label, ui_callback f, void *userdata);
+void ui_widget_menuitem_st(UiObject *obj, char *stockid, ui_callback f, void *userdata);
+void ui_widget_menuitem_gr(UiObject *obj, char *label, ui_callback f, void *userdata, ...);
+void ui_widget_menuitem_stgr(UiObject *obj, char *stockid, ui_callback f, void *userdata, ...);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UI_MENU_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/properties.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,62 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_PROPERTIES_H
+#define	UI_PROPERTIES_H
+
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UcxMap UiProperties;
+    
+char* ui_getappdir();
+char* ui_configfile(char *name);
+
+char* ui_get_property(char *name);
+void  ui_set_property(char *name, char *value);
+
+void ui_set_default_property(char *name, char *value);
+
+void ui_locales_dir(char *path);
+void ui_pixmaps_dir(char *path);
+
+void ui_load_lang(char *locale);
+void ui_load_lang_def(char *locale, char *default_locale);
+    
+char* uistr(char *name);
+char* uistr_n(char *name);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UI_PROPERTIES_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/range.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,48 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_RANGE_H
+#define UI_RANGE_H
+
+#include "toolkit.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+UIWIDGET ui_hscrollbar(UiObject *obj, UiRange *range, ui_callback f, void *userdata);
+UIWIDGET ui_vscrollbar(UiObject *obj, UiRange *range, ui_callback f, void *userdata);
+
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UI_RANGE_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/stock.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,89 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_STOCK_H
+#define	UI_STOCK_H
+
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+// motif stock ids
+#if UI_MOTIF || UI_COCOA || UI_QT4 || UI_QT5
+    
+#define UI_STOCK_NEW                    "ui.stock.New"
+#define UI_STOCK_OPEN                   "ui.stock.Open"
+#define UI_STOCK_SAVE                   "ui.stock.Save"
+#define UI_STOCK_SAVE_AS                "ui.stock.SaveAs"
+#define UI_STOCK_REVERT_TO_SAVED        "ui.stock.RevertToSaved"
+#define UI_STOCK_GO_BACK                "ui.stock.GoBack"
+#define UI_STOCK_GO_FORWARD             "ui.stock.GoForward"
+#define UI_STOCK_ADD                    "ui.stock.Add"
+#define UI_STOCK_CLOSE                  "ui.stock.Close"
+    
+#define UI_STOCK_UNDO                   "ui.stock.Undo"
+#define UI_STOCK_REDO                   "ui.stock.Redo"
+#define UI_STOCK_CUT                    "ui.stock.Cut"
+#define UI_STOCK_COPY                   "ui.stock.Copy"
+#define UI_STOCK_PASTE                  "ui.stock.Paste"
+#define UI_STOCK_DELETE                 "ui.stock.Delete"
+    
+#endif
+    
+#if UI_GTK2 || UI_GTK3
+    
+#define UI_STOCK_NEW                    GTK_STOCK_NEW
+#define UI_STOCK_OPEN                   GTK_STOCK_OPEN
+#define UI_STOCK_SAVE                   GTK_STOCK_SAVE
+#define UI_STOCK_SAVE_AS                GTK_STOCK_SAVE_AS
+#define UI_STOCK_REVERT_TO_SAVED        GTK_STOCK_REVERT_TO_SAVED
+#define UI_STOCK_UNDO                   GTK_STOCK_UNDO
+#define UI_STOCK_REDO                   GTK_STOCK_REDO
+#define UI_STOCK_GO_BACK                GTK_STOCK_GO_BACK
+#define UI_STOCK_GO_FORWARD             GTK_STOCK_GO_FORWARD
+#define UI_STOCK_ADD                    GTK_STOCK_ADD
+#define UI_STOCK_CLOSE                  GTK_STOCK_CLOSE
+
+#define UI_STOCK_UNDO                   GTK_STOCK_UNDO
+#define UI_STOCK_REDO                   GTK_STOCK_REDO
+#define UI_STOCK_CUT                    GTK_STOCK_CUT
+#define UI_STOCK_COPY                   GTK_STOCK_COPY
+#define UI_STOCK_PASTE                  GTK_STOCK_PASTE
+#define UI_STOCK_DELETE                 GTK_STOCK_DELETE
+    
+#endif
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UI_STOCK_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/text.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,64 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_TEXT_H
+#define	UI_TEXT_H
+
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+UIWIDGET ui_textarea(UiObject *obj, UiText *value);
+UIWIDGET ui_textarea_nv(UiObject *obj, char *varname);
+
+void ui_text_undo(UiText *value);
+void ui_text_redo(UiText *value);
+
+UIWIDGET ui_textfield(UiObject *obj, UiString *value);
+UIWIDGET ui_textfield_nv(UiObject *obj, char *varname);
+
+UIWIDGET ui_textfield_w(UiObject *obj, int width, UiString *value);
+UIWIDGET ui_textfield_wnv(UiObject *obj, int width, char *varname);
+
+UIWIDGET ui_frameless_textfield(UiObject *obj, UiString *value);
+UIWIDGET ui_frameless_textfield_nv(UiObject *obj, char *varname);
+
+UIWIDGET ui_passwordfield(UiObject *obj, UiString *value);
+UIWIDGET ui_passwordfield_nv(UiObject *obj, char *varname);
+UIWIDGET ui_passwordfield_w(UiObject *obj, int width, UiString *value);
+UIWIDGET ui_passwordfield_wnv(UiObject *obj, int width, char *varname);
+
+        
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UI_TEXT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/toolbar.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,60 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_TOOLBAR_H
+#define	UI_TOOLBAR_H
+
+#include "toolkit.h"
+#include <stdarg.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+void ui_toolitem(char *name, char *label, ui_callback f, void *udata);
+void ui_toolitem_st(char *name, char *stockid, ui_callback f, void *udata);
+void ui_toolitem_sti(char *name, char *stockid, ui_callback f, void *udata);
+void ui_toolitem_stgr(char *name, char *stockid, ui_callback f, void *udata, ...);
+void ui_toolitem_stgri(char *name, char *stockid, ui_callback f, void *userdata, ...);
+void ui_toolitem_img(char *name, char *label, char *img, ui_callback f, void *udata);
+void ui_toolitem_toggle_st(char *name, char *stockid, ui_callback f, void *udata);
+void ui_toolitem_toggle_stgr(char *name, char *stockid, ui_callback f, void *udata, ...);
+void ui_toolitem_toggle_imggr(char *name, char *label, char *img, ui_callback f, void *udata, ...);
+
+void ui_toolbar_combobox(char *name, UiList *list, ui_getvaluefunc getvalue, ui_callback f, void *udata);
+void ui_toolbar_combobox_str(char *name, UiList *list, ui_callback f, void *udata);
+void ui_toolbar_combobox_nv(char *name, char *listname, ui_getvaluefunc getvalue, ui_callback f, void *udata);
+
+void ui_toolbar_add_default(char *name);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UI_TOOLBAR_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/toolkit.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,367 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_TOOLKIT_H
+#define	UI_TOOLKIT_H
+
+#include <inttypes.h>
+
+#ifdef UI_COCOA
+
+#ifdef __OBJC__
+#import <Cocoa/Cocoa.h>
+#define UIWIDGET NSView*
+#define UIMENU   NSMenu*
+#else
+typedef void* UIWIDGET;
+typedef void* UIMENU;
+#endif
+
+#elif UI_GTK2 || UI_GTK3
+
+#include <gtk/gtk.h>
+#define UIWIDGET GtkWidget*
+#define UIMENU   GtkMenu*
+#define UI_GTK
+
+#elif UI_MOTIF
+
+#include <Xm/XmAll.h> 
+#define UIWIDGET Widget
+#define UIMENU   Widget
+
+#elif defined(UI_QT4) || defined(UI_QT5)
+#ifdef	__cplusplus
+#include <QApplication>
+#include <QWidget>
+#include <QMenu>
+#define UIWIDGET QWidget*
+#define UIMENU   QMenu*
+#else /* __cplusplus */
+#define UIWIDGET void*
+#define UIMENU   void*
+#endif
+
+#elif UI_WPF
+#define UIWIDGET void*
+#define UIMENU   void*
+#endif
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#define UI_GROUP_SELECTION  20000
+    
+/* public types */
+typedef int UiBool;
+
+typedef struct UiObject     UiObject;
+typedef struct UiEvent      UiEvent;
+typedef struct UiMouseEvent UiMouseEvent;
+typedef struct UiObserver   UiObserver;
+
+typedef struct UiInteger    UiInteger;
+typedef struct UiDouble     UiDouble;
+typedef struct UiString     UiString;
+typedef struct UiText       UiText;
+typedef struct UiList       UiList;
+typedef struct UiRange      UiRange;
+
+typedef struct UiStr        UiStr;
+
+/* begin opaque types */
+typedef struct UiContext    UiContext;
+typedef struct UiContainer  UiContainer;
+
+typedef struct UiIcon       UiIcon;
+typedef struct UiImage      UiImage;
+
+typedef struct UiSelection  UiSelection;
+/* end opaque types */
+
+typedef struct UiTabbedPane UiTabbedPane;
+
+enum UiMouseEventType { UI_PRESS = 0, UI_PRESS2 };
+
+
+  
+typedef void(*ui_callback)(UiEvent*, void*); /* event, user data */
+
+typedef void*(*ui_getvaluefunc)(void*, int);
+
+typedef int(*ui_threadfunc)(void*);
+
+typedef void(*ui_freefunc)(void*);
+
+struct UiObject {
+    /*
+     * native widget
+     */
+    UIWIDGET    widget;
+    
+    /*
+     * user window data
+     */
+    void        *window;
+    
+    /*
+     * window context
+     */
+    UiContext   *ctx;
+    
+    /*
+     * container interface
+     */
+    UiContainer *container;
+    
+    /*
+     * next container object
+     */
+    UiObject    *next;
+};
+
+struct UiTabbedPane {
+    /*
+     * native widget
+     */
+    UIWIDGET  widget;
+    
+    /*
+     * current document
+     */
+    void      *document;
+    
+    /*
+     * parent context
+     */
+    UiContext *ctx;
+};
+
+struct UiEvent {
+    UiObject *obj;
+    void     *document;
+    void     *window;
+    void     *eventdata;
+    int      intval;
+};
+
+struct UiMouseEvent {
+    int x;
+    int y;
+    enum UiMouseEventType type;
+    int button;
+};
+
+struct UiObserver {
+    ui_callback callback;
+    void *data;
+    UiObserver *next;
+};
+
+struct UiStr {
+    char *ptr;
+    void (*free)(void *v);
+};
+
+struct UiInteger {
+    int64_t  (*get)(UiInteger*);
+    void (*set)(UiInteger*, int64_t);
+    void *obj;
+    
+    int64_t value;
+    UiObserver *observers;
+};
+
+struct UiDouble {
+    double  (*get)(UiDouble*);
+    void (*set)(UiDouble*, double);
+    void *obj;
+    
+    double value;
+    UiObserver *observers;
+};
+
+struct UiString {
+    char* (*get)(UiString*);
+    void  (*set)(UiString*, char*);
+    void  *obj;
+    
+    UiStr value;
+    UiObserver *observers;
+};
+
+struct UiText {
+    void  (*set)(UiText*, char*);
+    char* (*get)(UiText*);
+    char* (*getsubstr)(UiText*, int, int); /* text, begin, end */
+    void  (*insert)(UiText*, int, char*);
+    void  (*setposition)(UiText*,int);
+    int   (*position)(UiText*);
+    void  (*selection)(UiText*, int*, int*); /* text, begin, end */
+    int   (*length)(UiText*);
+    void  (*remove)(UiText*, int, int); /* text, begin, end */
+    UiStr value;
+    int   pos;
+    void  *obj;
+    void  *undomgr;
+    // TODO: replacefunc, ...
+    UiObserver *observers;
+};
+    
+/*
+ * abstract list
+ */
+struct UiList {
+    /* get the first element */
+    void*(*first)(UiList *list);
+    /* get the next element */
+    void*(*next)(UiList *list);
+    /* get the nth element */
+    void*(*get)(UiList *list, int i);
+    /* get the number of elements */
+    int(*count)(UiList *list);
+    /* iterator changes after first() next() and get() */
+    void *iter;
+    /* private - implementation dependent */
+    void *data;
+    
+    /* binding function */
+    void (*update)(UiList *list, int i);
+    /* binding object */
+    void *obj;
+    
+    /* list of observers */
+    UiObserver *observers;
+};
+
+struct UiRange {
+    double (*get)(UiRange *range);
+    void   (*set)(UiRange *range, double value);
+    void   (*setrange)(UiRange *range, double min, double max);
+    void   (*setextent)(UiRange *range, double extent);
+    double value;
+    double min;
+    double max;
+    double extent;
+    void   *obj;
+    /* list of observers */
+    UiObserver *observers;
+};
+
+
+void ui_init(char *appname, int argc, char **argv);
+char* ui_appname();
+
+void ui_context_closefunc(UiContext *ctx, ui_callback fnc, void *udata);
+
+void ui_onstartup(ui_callback f, void *userdata);
+void ui_onopen(ui_callback f, void *userdata);
+void ui_onexit(ui_callback f, void *userdata);
+
+void ui_main();
+void ui_show(UiObject *obj);
+void ui_close(UiObject *obj);
+
+void ui_job(UiObject *obj, ui_threadfunc tf, void *td, ui_callback f, void *fd);
+
+void* ui_document_new(size_t size);
+void  ui_document_destroy(void *doc);
+
+void ui_set_document(UiObject *obj, void *document);    // deprecated
+void ui_detach_document(UiObject *obj);                 // deprecated
+void* ui_get_document(UiObject *obj);                   // deprecated
+void ui_set_subdocument(void *document, void *sub);     // deprecated
+void ui_detach_subdocument(void *document, void *sub);  // deprecated
+void* ui_get_subdocument(void *document);               // deprecated
+
+UiContext* ui_document_context(void *doc);
+
+void ui_attach_document(UiContext *ctx, void *document);
+void ui_detach_document2(UiContext *ctx, void *document);
+
+void ui_set_group(UiContext *ctx, int group);
+void ui_unset_group(UiContext *ctx, int group);
+int* ui_active_groups(UiContext *ctx, int *ngroups);
+    
+void* ui_malloc(UiContext *ctx, size_t size);
+void* ui_calloc(UiContext *ctx, size_t nelem, size_t elsize);
+void  ui_free(UiContext *ctx, void *ptr);
+void* ui_realloc(UiContext *ctx, void *ptr, size_t size);
+
+// types
+
+UiInteger* ui_int_new(UiContext *ctx, char *name);
+UiDouble* ui_double_new(UiContext *ctx, char *name);
+UiString* ui_string_new(UiContext *ctx, char *name);
+UiText* ui_text_new(UiContext *ctx, char *name);
+UiRange* ui_range_new(UiContext *ctx, char *name);
+
+UiObserver* ui_observer_new(ui_callback f, void *data);
+UiObserver* ui_obsvlist_add(UiObserver *list, UiObserver *observer);
+UiObserver* ui_add_observer(UiObserver *list, ui_callback f, void *data);
+void ui_notify(UiObserver *observer, void *data);
+void ui_notify_except(UiObserver *observer, UiObserver *exc, void *data);
+void ui_notify_evt(UiObserver *observer, UiEvent *event);
+
+
+UiList* ui_list_new(UiContext *ctx, char *name);
+void* ui_list_first(UiList *list);
+void* ui_list_next(UiList *list);
+void* ui_list_get(UiList *list, int i);
+int   ui_list_count(UiList *list);
+void  ui_list_append(UiList *list, void *data);
+void  ui_list_prepend(UiList *list, void *data);
+void ui_list_clear(UiList *list);
+void  ui_list_addobsv(UiList *list, ui_callback f, void *data);
+void  ui_list_notify(UiList *list);
+
+void ui_clipboard_set(char *str);
+char* ui_clipboard_get();
+
+void ui_add_image(char *imgname, char *filename); // TODO: remove?
+
+// general widget functions
+void ui_set_enabled(UIWIDGET widget, int enabled);
+void ui_set_show_all(UIWIDGET widget, int value);
+void ui_set_visible(UIWIDGET widget, int visible);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UI_TOOLKIT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/tree.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,135 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_TREE_H
+#define	UI_TREE_H
+
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+typedef struct UiModel         UiModel;
+typedef struct UiListCallbacks UiListCallbacks;
+typedef struct UiListSelection UiListSelection;
+
+typedef enum UiModelType {
+    UI_STRING = 0,
+    UI_INTEGER,
+    UI_ICON,
+    UI_ICON_TEXT,
+} UiModelType;
+
+struct UiModel {
+    /*
+     * number of columns
+     */
+    int columns;
+    
+    /*
+     * array of column types
+     * array length is the number of columns
+     */
+    UiModelType *types;
+    
+    /*
+     * array of column titles
+     * array length is the number of columns
+     */
+    char **titles;
+    
+    /*
+     * function for translating model data to view data
+     * first argument is the pointer returned by UiList->get or UiTree->get
+     * second argument is the column index
+     * TODO: return
+     */
+    void*(*getvalue)(void*, int);
+    
+    UiBool(*candrop)(UiEvent*, UiSelection*, UiList*, int);
+    void(*drop)(UiEvent*, UiSelection*, UiList*, int);
+    UiBool(*candrag)(UiEvent*, UiList*, int);
+    void(*data_get)(UiEvent*, UiSelection*, UiList*, int);
+    void(*data_delete)(UiEvent*, UiList*, int);
+};
+
+struct UiListCallbacks {
+    /*
+     * selection callback
+     */
+    ui_callback activate;
+    
+    /*
+     * cursor callback
+     */
+    ui_callback selection;
+    
+    /*
+     * userdata for all callbacks
+     */
+    void *userdata;
+};
+
+struct UiListSelection {
+    /*
+     * number of selected items
+     */
+    int count;
+    
+    /*
+     * indices of selected rows
+     */
+    int *rows;
+};
+
+UiModel* ui_model(UiContext *ctx, ...);
+void ui_model_free(UiContext *ctx, UiModel *mi);
+
+UIWIDGET ui_listview(UiObject *obj, UiList *list, ui_getvaluefunc getvalue, ui_callback f, void *udata);
+UIWIDGET ui_listview_str(UiObject *obj, UiList *list, ui_callback f, void *udata);
+UIWIDGET ui_listview_nv(UiObject *obj, char *listname, ui_getvaluefunc getvalue, ui_callback f, void *udata);
+
+UIWIDGET ui_table(UiObject *obj, UiList *data, UiModel *model, UiListCallbacks cb);
+UIWIDGET ui_table_nv(UiObject *obj, char *varname, UiModel *model, UiListCallbacks cb);
+
+void ui_table_dragsource(UIWIDGET tablewidget, int actions, char *target0, ...);
+void ui_table_dragsource_a(UIWIDGET tablewidget, int actions, char **targets, int nelm);
+void ui_table_dragdest(UIWIDGET tablewidget, int actions, char *target0, ...);
+void ui_table_dragdest_a(UIWIDGET tablewidget, int actions, char **targets, int nelm);
+
+UIWIDGET ui_combobox(UiObject *obj, UiList *list, ui_getvaluefunc getvalue, ui_callback f, void *udata);
+UIWIDGET ui_combobox_str(UiObject *obj, UiList *list, ui_callback f, void *udata);
+UIWIDGET ui_combobox_nv(UiObject *obj, char *varname, ui_getvaluefunc getvalue, ui_callback f, void *udata);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UI_TREE_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/ui.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,50 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_H
+#define	UI_H
+
+#include "toolkit.h"
+#include "container.h"
+#include "menu.h"
+#include "toolbar.h"
+#include "window.h"
+#include "stock.h"
+#include "button.h"
+#include "text.h"
+#include "properties.h"
+#include "tree.h"
+#include "graphics.h"
+#include "entry.h"
+#include "range.h"
+#include "image.h"
+#include "display.h"
+#include "dnd.h"
+
+#endif	/* UI_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/ui/window.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,49 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UI_WINDOW_H
+#define	UI_WINDOW_H
+
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+UiObject* ui_window(char *title, void *window_data);
+UiObject* ui_simplewindow(char *title, void *window_data);
+
+char* ui_openfiledialog(UiObject *obj);
+char* ui_savefiledialog(UiObject *obj);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* WINDOW_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/Makefile	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,38 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2012 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+$(WPF_OBJPRE)%.o: wpf/%.c
+	$(CC) -o $@ -c $(CFLAGS) $<
+
+$(UI_LIB): $(OBJ) uiw
+	$(AR) $(ARFLAGS) $(UI_LIB) $(OBJ)
+
+uiw:
+	cd wpf/UIwrapper; $(MSBUILD)
+	cp $(BUILD_ROOT)/build/UIwrapper/UIwrapper.dll $(BUILD_ROOT)/build/bin/
+	cp $(BUILD_ROOT)/build/UIcore/UIcore.dll $(BUILD_ROOT)/build/bin/
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIcore/Application.cs	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,106 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace UI
+{  
+    public class Application
+    {
+        private static Application instance;
+
+        private System.Windows.Application application;
+
+        private Thread thread;
+
+        public String Name;
+
+        public IApplicationCallbacks callbacks;
+
+        public List<Window> Windows = new List<Window>();
+        public ApplicationMenu Menu = new ApplicationMenu();
+        public MainToolBar ToolBar = new MainToolBar();
+        
+        private Application() : base()
+        {
+            thread = new Thread(() => RunApplication());
+            thread.SetApartmentState(ApartmentState.STA);
+        }
+
+        public static Application GetInstance()
+        {
+            if (instance == null)
+            {
+                instance = new Application();
+                GC.KeepAlive(instance);
+            }
+            return instance;
+        }
+
+        public Thread Start()
+        {
+            thread.Start();
+            return thread;
+        }
+
+        private void RunApplication()
+        {
+            application = new System.Windows.Application();
+
+            if(callbacks != null)
+            {
+                callbacks.OnStartup();
+            }
+            application.Run();
+            if(callbacks != null)
+            {
+                callbacks.OnExit();
+            }
+        }
+
+        public void AddWindow(Window window)
+        {
+            Windows.Add(window);
+        }
+
+        public void RemoveWindow(Window window)
+        {
+            Windows.Remove(window);
+            if (Windows.Count == 0)
+            {
+                application.Shutdown();
+            }
+        }
+    }
+
+    public class ResultExec<T>
+    {
+        public T Result;
+        public Func<T> Func;
+
+        public void Exec()
+        {
+            Result = Func.Invoke();
+        }
+    }
+
+    public class VoidExec
+    {
+        public Action Action;
+
+        public void Exec()
+        {
+            Action.Invoke();
+        }
+    }
+
+    public interface IApplicationCallbacks
+    {
+        void OnStartup();
+        void OnOpen();
+        void OnExit();
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIcore/Container.cs	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,321 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace UI
+{
+    public interface Container
+    {
+        Layout Layout { get; set; }
+        
+        void Add(UIElement control, bool fill);
+    }
+
+    public class Layout
+    {
+        public bool? Fill { get; set; }
+        public bool Hexpand { get; set; }
+        public bool Vexpand { get; set; }
+        public bool NewLine { get; set; }
+        public int GridWidth { get; set; }
+        public String Label { get; set; }
+
+        public Layout()
+        {
+            Reset();
+        }
+
+        public bool IsFill(bool fill)
+        {
+            if (Fill != null)
+            {
+                
+                return (bool)Fill;
+            }
+            return fill;
+        }
+
+        public void Reset()
+        {
+            Fill = null;
+            Hexpand = false;
+            Vexpand = false;
+            NewLine = false;
+            GridWidth = 1;
+            Label = null;
+        }
+    }
+
+    public enum BoxOrientation
+    {
+        VERTICAL,
+        HORIZONTAL
+    }
+
+    public class BoxContainer : Grid, Container
+    {
+        public Layout Layout { get; set; }
+        
+        private BoxOrientation Orientation;
+        private int Spacing;
+
+        private int x = 0;
+        private int y = 0;
+
+        private bool filled = false;
+
+        public BoxContainer(BoxOrientation orientation, int margin, int spacing) : base()
+        {
+            Layout = new Layout();
+            Margin = new Thickness(margin);
+            Spacing = spacing;
+            
+            Orientation = orientation;
+            if(Orientation == BoxOrientation.HORIZONTAL)
+            {
+                RowDefinition row = new RowDefinition();
+                row.Height = new GridLength(1, GridUnitType.Star);
+                RowDefinitions.Add(row);
+            }
+            else
+            {
+                ColumnDefinition col = new ColumnDefinition();
+                col.Width = new GridLength(1, GridUnitType.Star);
+                ColumnDefinitions.Add(col);
+            }
+        }
+
+        public BoxContainer(Container parent, BoxOrientation orientation, int margin, int spacing) : this(orientation, margin, spacing)
+        {
+            parent.Add(this, true);
+        }
+        
+        public void Add(UIElement control, bool fill)
+        {
+            fill = Layout.IsFill(fill);
+            
+            if(Orientation == BoxOrientation.HORIZONTAL)
+            {
+                if(Spacing > 0)
+                {
+                    ColumnDefinition spaceCol = new ColumnDefinition();
+                    spaceCol.Width = new GridLength(Spacing, GridUnitType.Pixel);
+                    ColumnDefinitions.Add(spaceCol);
+                    x++;
+                }
+
+                ColumnDefinition col = new ColumnDefinition();
+                if(filled && fill)
+                {
+                    fill = false;
+                    Console.WriteLine("BoxContainer can only contain one filled control");
+                }
+                if(fill)
+                {
+                    col.Width = new GridLength(1, GridUnitType.Star);
+                    filled = true;
+                }
+                else
+                {
+                    col.Width = GridLength.Auto;
+                }
+                ColumnDefinitions.Add(col);
+            }
+            else
+            {
+                if (Spacing > 0)
+                {
+                    RowDefinition spaceRow = new RowDefinition();
+                    spaceRow.Height = new GridLength(Spacing, GridUnitType.Pixel);
+                    RowDefinitions.Add(spaceRow);
+                    y++;
+                }
+
+                RowDefinition row = new RowDefinition();
+                if (filled && fill)
+                {
+                    fill = false;
+                    Console.WriteLine("BoxContainer can only contain one filled control");
+                }
+                if(fill)
+                {
+                    row.Height = new GridLength(1, GridUnitType.Star);
+                    filled = true;
+                }
+                else
+                {
+                    row.Height = GridLength.Auto;
+                }
+                RowDefinitions.Add(row);
+            }
+
+            Grid.SetColumn(control, x);
+            Grid.SetRow(control, y);
+            Children.Add(control);
+
+            if(Orientation == BoxOrientation.HORIZONTAL)
+            {
+                x++;
+            }
+            else
+            {
+                y++;
+            }
+
+            Layout.Reset();
+        }
+    }
+    
+    public class GridContainer : Grid, Container
+    {
+        public Layout Layout { get; set; }
+
+        private int X = 0;
+        private int Y = 0;
+        private int CurrentWidth = 0;
+        private int CurrentHeight = 0;
+
+        private int ColSpacing;
+        private int RowSpacing;
+
+        public GridContainer(Container parent, int margin, int colspacing, int rowspacing) : base()
+        {
+            Layout = new Layout();
+
+            Margin = new Thickness(margin);
+            ColSpacing = colspacing;
+            RowSpacing = rowspacing;
+
+            parent.Add(this, true);
+        }
+
+        public void Add(UIElement control, bool fill)
+        {
+            if(Layout.NewLine)
+            {
+                X = 0;
+                Y++;
+            }
+
+            ColumnDefinition col;
+            RowDefinition row;
+            bool getcol = false;
+            if(X >= CurrentWidth)
+            {
+                if (ColSpacing > 0 && X != 0)
+                {
+                    ColumnDefinition spaceCol = new ColumnDefinition();
+                    spaceCol.Width = new GridLength(ColSpacing, GridUnitType.Pixel);
+                    ColumnDefinitions.Add(spaceCol);
+                    X++;
+                }
+
+                col = new ColumnDefinition();
+                col.Width = GridLength.Auto;
+                ColumnDefinitions.Add(col);
+
+                CurrentWidth = X + 1;
+            }
+            else
+            {
+                if (ColSpacing > 0 && X % 2 > 0)
+                {
+                    X++;
+                }
+                col = ColumnDefinitions.ElementAt(X);
+            }
+
+            if(getcol)
+            {
+                col = ColumnDefinitions.ElementAt(X);
+            }
+
+            if (Y >= CurrentHeight)
+            {
+                if (RowSpacing > 0 && Y != 0)
+                {
+                    RowDefinition spaceRow = new RowDefinition();
+                    spaceRow.Height = new GridLength(RowSpacing, GridUnitType.Pixel);
+                    RowDefinitions.Add(spaceRow);
+                    Y++;
+                }
+
+                row = new RowDefinition();
+                row.Height = GridLength.Auto;
+                RowDefinitions.Add(row);
+                CurrentHeight = Y + 1;
+            }
+            else
+            {
+                row = RowDefinitions.ElementAt(Y);
+            }
+
+            if(Layout.Hexpand)
+            {
+                col.Width = new GridLength(1, GridUnitType.Star);
+            }
+            if(Layout.Vexpand)
+            {
+                row.Height = new GridLength(1, GridUnitType.Star);
+            }
+
+            int gridwidth = Layout.GridWidth;
+            if(gridwidth > 1)
+            {
+                gridwidth++;
+            }
+
+            Grid.SetColumn(control, X);
+            Grid.SetRow(control, Y);
+            Grid.SetColumnSpan(control, gridwidth);
+            Children.Add(control);
+
+            Layout.Reset();
+            X += gridwidth;
+        }
+    }
+
+    public class ScrollViewerContainer : ScrollViewer, Container
+    {
+        public Layout Layout { get; set; }
+
+        public ScrollViewerContainer(Container parent) : base()
+        {
+            Layout = new Layout();
+
+            HorizontalScrollBarVisibility = ScrollBarVisibility.Auto;
+            VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
+
+            parent.Add(this, true);
+        }
+
+        public void Add(UIElement control, bool fill)
+        {
+            Content = control;
+        }
+    }
+
+    public class TabViewContainer : TabControl, Container
+    {
+        public Layout Layout { get; set; }
+
+        public TabViewContainer(Container parent) : base()
+        {
+            Layout = new Layout();
+            parent.Add(this, true);
+        }
+
+        public void Add(UIElement control, bool fill)
+        {
+            TabItem tab = new TabItem();
+            tab.Header = Layout.Label != null ? Layout.Label : "New Tab";
+            Items.Add(tab);
+            tab.Content = control;
+            Layout.Reset();
+        }
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIcore/Controls.cs	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace UI
+{  
+    public class Controls
+    {
+        public static Button Button(Container container, String label, RoutedEventHandler e)
+        {
+            Button button = new Button();
+            button.Content = label;
+            container.Add(button, false);
+
+            button.Click += e;
+
+            return button;
+        }
+
+        public static Label Label(Container container, String str, int alignment)
+        {
+            HorizontalAlignment a;
+            switch (alignment)
+            {
+                case 0: a = HorizontalAlignment.Left; break;
+                case 1: a = HorizontalAlignment.Right; break;
+                case 2: a = HorizontalAlignment.Center; break;
+                default: a = HorizontalAlignment.Left; break;
+            }
+
+            Label label = new Label();
+            label.HorizontalAlignment = a;
+            label.Content = str;
+            container.Add(label, false);
+
+            return label;
+        }
+
+        public static Label Space(Container container)
+        {
+            return Label(container, null, 2);
+        }
+
+        public static Separator Separator(Container container)
+        {
+            Separator separator = new Separator();
+            container.Add(separator, false);
+            return separator;
+        }
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIcore/DrawingArea.cs	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,99 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+using System.Windows.Shapes;
+using System.Diagnostics;
+
+namespace UI
+{
+    public class DrawingArea : System.Windows.Controls.Canvas
+    {
+        public Action<int,int> resizeCallback;
+
+        public Color Color;
+        private Brush Brush;
+
+        public DrawingArea(Container container) : base()
+        {
+            this.SizeChanged += UpdateSize;
+            ResetGraphics();
+
+            container.Add(this, true);
+        }
+
+        public void UpdateSize(object sender, SizeChangedEventArgs e)
+        {
+            if(resizeCallback != null)
+            {
+                Children.Clear();
+                ResetGraphics();
+
+                Size s = e.NewSize;
+                resizeCallback((int)s.Width, (int)s.Height);
+            }
+        }
+
+        public void Redraw()
+        {
+            if (resizeCallback != null)
+            {
+                Children.Clear();
+                ResetGraphics();
+
+                resizeCallback((int)ActualWidth, (int)ActualHeight);
+            }
+
+        }
+
+        private void ResetGraphics()
+        {
+            Color = Color.FromRgb(0, 0, 0);
+            Brush = System.Windows.Media.Brushes.Black;
+        }
+
+        public void SetColor(int r, int g, int b)
+        {
+            Color = Color.FromRgb((byte)r, (byte)g, (byte)b);
+            Brush = new SolidColorBrush(Color);
+        }
+
+        public void DrawLine(int x1, int y1, int x2, int y2)
+        {
+            Line line = new Line();
+            line.Stroke = Brush;
+            line.StrokeThickness = 1;
+            line.SnapsToDevicePixels = true;
+
+            line.X1 = x1;
+            line.Y1 = y1;
+            line.X2 = x2;
+            line.Y2 = y2;
+
+            Children.Add(line);
+        }
+
+        public void DrawRect(int x, int y, int w, int h, bool fill)
+        {
+            Rectangle rect = new Rectangle();
+            rect.Stroke = Brush;
+            rect.StrokeThickness = 1;
+            rect.SnapsToDevicePixels = true;
+            if(fill)
+            {
+                rect.Fill = Brush;
+            }
+
+            rect.Width = w;
+            rect.Height = h;
+            SetLeft(rect, x);
+            SetTop(rect, y);
+
+            Children.Add(rect);
+        }
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIcore/MainToolBar.cs	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,77 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+
+namespace UI
+{
+    public class MainToolBar
+    {
+        Dictionary<string, IToolItem> Items = new Dictionary<string, IToolItem>();
+        List<string> Defaults = new List<string>();
+
+        public MainToolBar()
+        {
+
+        }
+
+        public bool HasItems()
+        {
+            return Defaults.Count > 0 ? true : false;
+        }
+
+        public void AddDefault(string itemName)
+        {
+            Defaults.Add(itemName);
+        }
+
+        public void AddToolItem(string name, string label, Action<IntPtr> action)
+        {
+            ToolItem item = new ToolItem();
+            item.Label = label;
+            item.Action = action;
+            Items.Add(name, item);
+        }
+
+        public ToolBarTray CreateToolBarTray(IntPtr objptr)
+        {
+            ToolBarTray tray = new ToolBarTray();
+            ToolBar toolbar = new ToolBar();
+            tray.ToolBars.Add(toolbar);
+            foreach(string s in Defaults)
+            {
+                IToolItem item = Items[s];
+                item.AddTo(toolbar, objptr);
+            }
+
+            return tray;
+        }
+    }
+
+    public interface IToolItem
+    {
+        void AddTo(System.Windows.Controls.ToolBar toolbar, IntPtr uiobj);
+    }
+
+    public class ToolItem : IToolItem
+    {
+        public string Label { get; set; }
+        // TODO: icon
+        public Action<IntPtr> Action { get; set; }
+
+        public void AddTo(System.Windows.Controls.ToolBar toolbar, IntPtr uiobj)
+        {
+            Button button = new Button();
+            button.Content = Label;
+
+            EventCallback e = new EventCallback(uiobj, Action);
+            button.Click += e.Callback;
+
+            toolbar.Items.Add(button);
+        }
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIcore/Menu.cs	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,119 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+
+namespace UI
+{
+    public class ApplicationMenu
+    {
+        private List<Menu> current = new List<Menu>();
+
+        public List<Menu> Menus = new List<Menu>();
+
+        public void AddMenu(String label)
+        {
+            current.Clear();
+            Menu menu = new Menu(label);
+            current.Add(menu);
+            Menus.Add(menu);
+        }
+
+        public Boolean IsEmpty()
+        {
+            return Menus.Count == 0 ? true : false;
+        }
+
+        public void AddSubMenu(String label)
+        {
+            Menu menu = new Menu(label);
+            current.Last().Items.Add(menu);
+            current.Add(menu);
+        }
+
+        public void EndSubMenu()
+        {
+            current.Remove(current.Last());
+        }
+
+        public void AddMenuItem(String label, Action<IntPtr> action)
+        {
+            if(current.Count != 0)
+            {
+                MenuItem item = new MenuItem(label, action);
+                current.Last().Items.Add(item);
+            }
+        }
+
+        public System.Windows.Controls.Menu CreateMenu(IntPtr uiobj)
+        {
+            System.Windows.Controls.Menu menu = new System.Windows.Controls.Menu();
+            menu.Background = new SolidColorBrush(Color.FromRgb(255, 255, 255));
+            foreach (Menu m in Menus)
+            {
+                System.Windows.Controls.MenuItem i = new System.Windows.Controls.MenuItem();
+                i.Header = m.Label;
+                m.AddItems(i, uiobj);
+                menu.Items.Add(i);
+            }
+            return menu;
+        }
+    }
+
+    public interface IMenuItem
+    {
+        void AddTo(System.Windows.Controls.MenuItem menu, IntPtr uiobj);
+    }
+
+    public class Menu : IMenuItem
+    {
+        public String Label;
+        public List<IMenuItem> Items = new List<IMenuItem>();
+
+        public Menu(String label)
+        {
+            Label = label;
+        }
+
+        public void AddItems(System.Windows.Controls.MenuItem i, IntPtr uiobj)
+        {
+            foreach (IMenuItem item in Items)
+            {
+                item.AddTo(i, uiobj);
+            }
+        }
+
+        void IMenuItem.AddTo(System.Windows.Controls.MenuItem menu, IntPtr uiobj)
+        {
+            System.Windows.Controls.MenuItem i = new System.Windows.Controls.MenuItem();
+            i.Header = Label;
+            AddItems(i, uiobj);
+            menu.Items.Add(i);
+        }
+    }
+
+    public class MenuItem : IMenuItem
+    {
+        String Label;
+        Action<IntPtr> Action;
+
+        public MenuItem(String label, Action<IntPtr> action)
+        {
+            Label = label;
+            Action = action;
+        }
+
+        void IMenuItem.AddTo(System.Windows.Controls.MenuItem menu, IntPtr uiobj)
+        {
+            System.Windows.Controls.MenuItem i = new System.Windows.Controls.MenuItem();
+            EventCallback cb = new EventCallback(uiobj, Action);
+            i.Click += cb.Callback;
+            i.Header = Label;
+            menu.Items.Add(i);
+        }
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIcore/Properties/AssemblyInfo.cs	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// Allgemeine Informationen über eine Assembly werden über die folgenden 
+// Attribute gesteuert. Ändern Sie diese Attributwerte, um die Informationen zu ändern,
+// die mit einer Assembly verknüpft sind.
+[assembly: AssemblyTitle("UIcore")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("UIcore")]
+[assembly: AssemblyCopyright("Copyright ©  2015")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Durch Festlegen von ComVisible auf "false" werden die Typen in dieser Assembly unsichtbar 
+// für COM-Komponenten.  Wenn Sie auf einen Typ in dieser Assembly von 
+// COM zugreifen müssen, legen Sie das ComVisible-Attribut für diesen Typ auf "true" fest.
+[assembly: ComVisible(false)]
+
+// Die folgende GUID bestimmt die ID der Typbibliothek, wenn dieses Projekt für COM verfügbar gemacht wird
+[assembly: Guid("e93c93b6-d270-4178-998f-7e68d9591874")]
+
+// Versionsinformationen für eine Assembly bestehen aus den folgenden vier Werten:
+//
+//      Hauptversion
+//      Nebenversion 
+//      Buildnummer
+//      Revision
+//
+// Sie können alle Werte angeben oder die standardmäßigen Build- und Revisionsnummern 
+// übernehmen, indem Sie "*" eingeben:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIcore/TextArea.cs	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,79 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace UI
+{
+    public class TextArea : System.Windows.Controls.TextBox
+    {
+        public TextArea(Container container, String text, bool textarea) : base()
+        {
+            bool fill = false;
+            if (textarea)
+            {
+                AcceptsReturn = true;
+                IsUndoEnabled = false; // we need our own undo stack
+                VerticalScrollBarVisibility = System.Windows.Controls.ScrollBarVisibility.Auto;
+                HorizontalScrollBarVisibility = System.Windows.Controls.ScrollBarVisibility.Auto;
+                fill = true;
+            }
+            else
+            {
+                HorizontalScrollBarVisibility = System.Windows.Controls.ScrollBarVisibility.Auto;
+                MinWidth = 15;
+            }
+
+            if (text != null)
+            {
+                Text = text;
+            }
+
+            container.Add(this, fill);
+        }
+
+
+        // ------------------ UiText methods ------------------
+
+        public void SetText(String str)
+        {
+            Text = str;
+        }
+
+        public String GetText()
+        {
+            return Text;
+        }
+
+        public String GetSubString(int begin, int end)
+        {
+            return null;
+        }
+
+        public void Insert(int pos, String str)
+        {
+
+        }
+
+        public int Position()
+        {
+            return CaretIndex;
+        }
+
+        public int Selection()
+        {
+            return 0;
+        }
+
+        public int Length()
+        {
+            return Text.Length;
+        }
+
+        public void Remove(int begin, int end)
+        {
+
+        }
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIcore/Toolkit.cs	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace UI
+{
+    public class EventCallback
+    {
+        public IntPtr Object;
+        public Action<IntPtr> Action;
+
+        public EventCallback(IntPtr uiobj, Action<IntPtr> action)
+        {
+            Object = uiobj;
+            Action = action;
+        }
+
+        public void Callback(object sender, RoutedEventArgs a)
+        {
+            Action.Invoke(Object);
+        }
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIcore/UIcore.csproj	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,68 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{8573F7D8-F05F-4195-9005-1C219B976146}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>UIcore</RootNamespace>
+    <AssemblyName>UIcore</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>..\..\..\build\UIcore\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <PlatformTarget>AnyCPU</PlatformTarget>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>..\..\..\build\UIcore\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="PresentationCore" />
+    <Reference Include="PresentationFramework" />
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Windows" />
+    <Reference Include="System.Windows.Controls.Ribbon" />
+    <Reference Include="System.Xaml" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+    <Reference Include="WindowsBase" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Container.cs" />
+    <Compile Include="Controls.cs" />
+    <Compile Include="DrawingArea.cs" />
+    <Compile Include="MainToolBar.cs" />
+    <Compile Include="Menu.cs" />
+    <Compile Include="TextArea.cs" />
+    <Compile Include="Toolkit.cs" />
+    <Compile Include="Window.cs" />
+    <Compile Include="Application.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIcore/Window.cs	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,110 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace UI
+{
+    public class MainWindow : Window, Container
+    {
+        public Layout Layout
+        {
+            get
+            {
+                return Container.Layout;
+            }
+            set
+            {
+                Container.Layout = value;
+            }
+        }
+        
+        public IntPtr Object;
+        public Container Container;
+        
+        public MainWindow(String title, IntPtr uiobj)
+        {
+            Title = title;
+            Object = uiobj;
+            Width = 300;
+            Height = 300;
+
+            Grid windowGrid = new Grid();
+            ColumnDefinition column = new ColumnDefinition();
+            column.Width = new GridLength(1, GridUnitType.Star);
+            windowGrid.ColumnDefinitions.Add(column);
+            this.AddChild(windowGrid);
+            int rowIndex = 0;
+
+            // menu
+            Application app = Application.GetInstance();
+            System.Windows.Controls.Menu menu = null;
+            if (!app.Menu.IsEmpty())
+            {
+                menu = app.Menu.CreateMenu(uiobj);
+
+                RowDefinition menuRow = new RowDefinition();
+                menuRow.Height = GridLength.Auto;
+                windowGrid.RowDefinitions.Add(menuRow);
+
+                Grid.SetRow(menu, rowIndex);
+                Grid.SetColumn(menu, 0);
+                windowGrid.Children.Add(menu);
+                rowIndex++;
+            }
+
+            // toolbar
+            if(app.ToolBar.HasItems())
+            {
+                System.Windows.Controls.ToolBarTray tray = app.ToolBar.CreateToolBarTray(uiobj);
+                RowDefinition menuRow = new RowDefinition();
+                menuRow.Height = GridLength.Auto;
+                windowGrid.RowDefinitions.Add(menuRow);
+
+                Grid.SetRow(tray, rowIndex);
+                Grid.SetColumn(tray, 0);
+                windowGrid.Children.Add(tray);
+                rowIndex++;
+
+                if(menu != null)
+                {
+                    menu.Background = tray.Background;
+                }
+            }
+
+            // content
+            RowDefinition contentRow = new RowDefinition();
+            contentRow.Height = new GridLength(1, GridUnitType.Star);
+            windowGrid.RowDefinitions.Add(contentRow);
+            BoxContainer vbox = new BoxContainer(BoxOrientation.VERTICAL, 0, 0);
+            Grid.SetColumn(vbox, 0);
+            Grid.SetRow(vbox, rowIndex);
+            windowGrid.Children.Add(vbox);
+            rowIndex++;
+
+            Container = vbox;
+
+            Closed += CloseEvent;
+        }
+
+        public void ShowWindow()
+        {
+            this.Show();
+            Application.GetInstance().AddWindow(this);
+        }
+
+        public void CloseEvent(object sender, System.EventArgs e)
+        {
+            Application.GetInstance().RemoveWindow(this);
+        }
+
+        public void Add(UIElement control, bool fill)
+        {
+            Container.Add(control, fill);
+        }
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper.sln	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,40 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 14
+VisualStudioVersion = 14.0.25420.1
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "UIwrapper", "UIwrapper\UIwrapper.vcxproj", "{367C474F-D7EA-44E3-9CB7-A4A35DCE9CC5}"
+	ProjectSection(ProjectDependencies) = postProject
+		{8573F7D8-F05F-4195-9005-1C219B976146} = {8573F7D8-F05F-4195-9005-1C219B976146}
+	EndProjectSection
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "UIcore", "..\UIcore\UIcore.csproj", "{8573F7D8-F05F-4195-9005-1C219B976146}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Release|Any CPU = Release|Any CPU
+		Release|x64 = Release|x64
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{367C474F-D7EA-44E3-9CB7-A4A35DCE9CC5}.Debug|Any CPU.ActiveCfg = Debug|x64
+		{367C474F-D7EA-44E3-9CB7-A4A35DCE9CC5}.Debug|Any CPU.Build.0 = Debug|x64
+		{367C474F-D7EA-44E3-9CB7-A4A35DCE9CC5}.Debug|x64.ActiveCfg = Debug|x64
+		{367C474F-D7EA-44E3-9CB7-A4A35DCE9CC5}.Debug|x64.Build.0 = Debug|x64
+		{367C474F-D7EA-44E3-9CB7-A4A35DCE9CC5}.Release|Any CPU.ActiveCfg = Release|Win32
+		{367C474F-D7EA-44E3-9CB7-A4A35DCE9CC5}.Release|x64.ActiveCfg = Release|x64
+		{367C474F-D7EA-44E3-9CB7-A4A35DCE9CC5}.Release|x64.Build.0 = Release|x64
+		{8573F7D8-F05F-4195-9005-1C219B976146}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8573F7D8-F05F-4195-9005-1C219B976146}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8573F7D8-F05F-4195-9005-1C219B976146}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{8573F7D8-F05F-4195-9005-1C219B976146}.Debug|x64.Build.0 = Debug|Any CPU
+		{8573F7D8-F05F-4195-9005-1C219B976146}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8573F7D8-F05F-4195-9005-1C219B976146}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8573F7D8-F05F-4195-9005-1C219B976146}.Release|x64.ActiveCfg = Release|Any CPU
+		{8573F7D8-F05F-4195-9005-1C219B976146}.Release|x64.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal
Binary file ui/wpf/UIwrapper/UIwrapper.v12.suo has changed
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/AssemblyInfo.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,38 @@
+#include "stdafx.h"
+
+using namespace System;
+using namespace System::Reflection;
+using namespace System::Runtime::CompilerServices;
+using namespace System::Runtime::InteropServices;
+using namespace System::Security::Permissions;
+
+//
+// Allgemeine Informationen über eine Assembly werden über die folgenden
+// Attribute gesteuert. Ändern Sie diese Attributwerte, um die Informationen zu ändern,
+// die mit einer Assembly verknüpft sind.
+//
+[assembly:AssemblyTitleAttribute(L"UIwrapper")];
+[assembly:AssemblyDescriptionAttribute(L"")];
+[assembly:AssemblyConfigurationAttribute(L"")];
+[assembly:AssemblyCompanyAttribute(L"")];
+[assembly:AssemblyProductAttribute(L"UIwrapper")];
+[assembly:AssemblyCopyrightAttribute(L"Copyright (c)  2015")];
+[assembly:AssemblyTrademarkAttribute(L"")];
+[assembly:AssemblyCultureAttribute(L"")];
+
+//
+// Versionsinformationen für eine Assembly bestehen aus den folgenden vier Werten:
+//
+//      Hauptversion
+//      Nebenversion
+//      Buildnummer
+//      Revision
+//
+// Sie können alle Werte angeben oder für die Revisions- und Buildnummer den Standard
+// übernehmen, indem Sie "*" eingeben:
+
+[assembly:AssemblyVersionAttribute("1.0.*")];
+
+[assembly:ComVisible(false)];
+
+[assembly:CLSCompliantAttribute(true)];
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/ReadMe.txt	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,30 @@
+========================================================================
+    DYNAMIC LINK LIBRARY: UIwrapper-Projektübersicht
+========================================================================
+
+Diese UIwrapper-DLL wurde vom Anwendungs-Assistenten für Sie erstellt.  
+
+Diese Datei bietet eine Übersicht über den Inhalt der einzelnen Dateien, aus
+denen Ihre UIwrapper-Anwendung besteht.
+
+UIwrapper.vcxproj
+    Dies ist die Hauptprojektdatei für VC++-Projekte, die mit dem Anwendungs-Assistenten generiert werden. Sie enthält Informationen über die Version von Visual C++, mit der die Datei generiert wurde, sowie über die Plattformen, Konfigurationen und Projektfunktionen, die im Anwendungs-Assistenten ausgewählt wurden.
+
+UIwrapper.vcxproj.filters
+    Dies ist die Filterdatei für VC++-Projekte, die mithilfe eines Anwendungs-Assistenten erstellt werden. Sie enthält Informationen über die Zuordnung zwischen den Dateien im Projekt und den Filtern. Diese Zuordnung wird in der IDE zur Darstellung der Gruppierung von Dateien mit ähnlichen Erweiterungen unter einem bestimmten Knoten verwendet (z. B. sind CPP-Dateien dem Filter "Quelldateien" zugeordnet).
+
+UIwrapper.cpp
+    Dies ist die Hauptquelldatei der DLL.
+
+UIwrapper.h
+    Diese Datei enthält eine Klassendeklaration.
+
+AssemblyInfo.cpp
+	Enthält benutzerdefinierte Attribute zum Ändern von Assemblymetadaten.
+
+/////////////////////////////////////////////////////////////////////////////
+Weitere Hinweise:
+
+Der Anwendungs-Assistent weist Sie mit "TODO:" auf Teile des Quellcodes hin, die Sie ergänzen oder anpassen sollten.
+
+/////////////////////////////////////////////////////////////////////////////
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/Stdafx.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,5 @@
+// stdafx.cpp : Quelldatei, die nur die Standard-Includes einbindet.
+// UIwrapper.pch ist der vorkompilierte Header.
+// stdafx.obj enthält die vorkompilierten Typinformationen.
+
+#include "stdafx.h"
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/Stdafx.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,7 @@
+// stdafx.h : Includedatei für Standardsystem-Includedateien
+// oder häufig verwendete projektspezifische Includedateien,
+// die nur in unregelmäßigen Abständen geändert werden.
+
+#pragma once
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/UIwrapper.vcxproj	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,194 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{367C474F-D7EA-44E3-9CB7-A4A35DCE9CC5}</ProjectGuid>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
+    <Keyword>ManagedCProj</Keyword>
+    <RootNamespace>UIwrapper</RootNamespace>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+    <CLRSupport>true</CLRSupport>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+    <CLRSupport>true</CLRSupport>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+    <CLRSupport>true</CLRSupport>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+    <CLRSupport>true</CLRSupport>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <LinkIncremental>true</LinkIncremental>
+    <OutDir>$(SolutionDir)..\..\..\build\UIwrapper\</OutDir>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <LinkIncremental>true</LinkIncremental>
+    <OutDir>$(SolutionDir)..\..\..\build\UIwrapper\</OutDir>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LinkIncremental>false</LinkIncremental>
+    <OutDir>$(SolutionDir)..\..\..\build\UIwrapper\</OutDir>
+    <IntDir>$(SolutionDir)..\..\..\build\UIwrapper\$(Configuration)\</IntDir>
+    <LibraryPath>$(LibraryPath)</LibraryPath>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <AdditionalUsingDirectories>$(SolutionDir)..\..\..\build\UIcore\;%(AdditionalUsingDirectories)</AdditionalUsingDirectories>
+    </ClCompile>
+    <Link>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies />
+      <AdditionalLibraryDirectories>C:\Users\Olaf\Projekte\toolkit\build\UIcore\</AdditionalLibraryDirectories>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <AdditionalUsingDirectories>$(SolutionDir)..\..\..\build\UIcore\;%(AdditionalUsingDirectories)</AdditionalUsingDirectories>
+    </ClCompile>
+    <Link>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies>
+      </AdditionalDependencies>
+      <AdditionalLibraryDirectories>
+      </AdditionalLibraryDirectories>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PreprocessorDefinitions>WIN32;NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+    </ClCompile>
+    <Link>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies />
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PreprocessorDefinitions>WIN32;NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <AdditionalUsingDirectories>$(SolutionDir)..\..\..\build\UIcore\;%(AdditionalUsingDirectories)</AdditionalUsingDirectories>
+      <DebugInformationFormat>None</DebugInformationFormat>
+    </ClCompile>
+    <Link>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies>
+      </AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <Reference Include="PresentationCore" />
+    <Reference Include="PresentationFramework" />
+    <Reference Include="System" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Windows" />
+    <Reference Include="System.Windows.Controls.Ribbon" />
+    <Reference Include="System.Xaml" />
+    <Reference Include="System.Xml" />
+    <Reference Include="WindowsBase" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="controls.h" />
+    <ClInclude Include="container.h" />
+    <ClInclude Include="graphics.h" />
+    <ClInclude Include="menu.h" />
+    <ClInclude Include="resource.h" />
+    <ClInclude Include="Stdafx.h" />
+    <ClInclude Include="toolbar.h" />
+    <ClInclude Include="toolkit.h" />
+    <ClInclude Include="window.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="AssemblyInfo.cpp" />
+    <ClCompile Include="controls.cpp" />
+    <ClCompile Include="graphics.cpp" />
+    <ClCompile Include="menu.cpp" />
+    <ClCompile Include="container.cpp" />
+    <ClCompile Include="toolbar.cpp" />
+    <ClCompile Include="window.cpp" />
+    <ClCompile Include="Stdafx.cpp">
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">Create</PrecompiledHeader>
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">Create</PrecompiledHeader>
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">Create</PrecompiledHeader>
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|x64'">Create</PrecompiledHeader>
+    </ClCompile>
+    <ClCompile Include="toolkit.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <Text Include="ReadMe.txt" />
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="app.rc" />
+  </ItemGroup>
+  <ItemGroup>
+    <Image Include="app.ico" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/UIwrapper.vcxproj.filters	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Quelldateien">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Headerdateien">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;hm;inl;inc;xsd</Extensions>
+    </Filter>
+    <Filter Include="Ressourcendateien">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="Stdafx.h">
+      <Filter>Headerdateien</Filter>
+    </ClInclude>
+    <ClInclude Include="resource.h">
+      <Filter>Headerdateien</Filter>
+    </ClInclude>
+    <ClInclude Include="toolkit.h">
+      <Filter>Headerdateien</Filter>
+    </ClInclude>
+    <ClInclude Include="window.h">
+      <Filter>Headerdateien</Filter>
+    </ClInclude>
+    <ClInclude Include="menu.h">
+      <Filter>Headerdateien</Filter>
+    </ClInclude>
+    <ClInclude Include="controls.h">
+      <Filter>Headerdateien</Filter>
+    </ClInclude>
+    <ClInclude Include="container.h">
+      <Filter>Headerdateien</Filter>
+    </ClInclude>
+    <ClInclude Include="toolbar.h">
+      <Filter>Headerdateien</Filter>
+    </ClInclude>
+    <ClInclude Include="graphics.h">
+      <Filter>Headerdateien</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="AssemblyInfo.cpp">
+      <Filter>Quelldateien</Filter>
+    </ClCompile>
+    <ClCompile Include="Stdafx.cpp">
+      <Filter>Quelldateien</Filter>
+    </ClCompile>
+    <ClCompile Include="window.cpp">
+      <Filter>Quelldateien</Filter>
+    </ClCompile>
+    <ClCompile Include="toolkit.cpp">
+      <Filter>Quelldateien</Filter>
+    </ClCompile>
+    <ClCompile Include="menu.cpp">
+      <Filter>Quelldateien</Filter>
+    </ClCompile>
+    <ClCompile Include="controls.cpp">
+      <Filter>Quelldateien</Filter>
+    </ClCompile>
+    <ClCompile Include="container.cpp">
+      <Filter>Quelldateien</Filter>
+    </ClCompile>
+    <ClCompile Include="toolbar.cpp">
+      <Filter>Quelldateien</Filter>
+    </ClCompile>
+    <ClCompile Include="graphics.cpp">
+      <Filter>Quelldateien</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <Text Include="ReadMe.txt" />
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="app.rc">
+      <Filter>Ressourcendateien</Filter>
+    </ResourceCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <Image Include="app.ico">
+      <Filter>Ressourcendateien</Filter>
+    </Image>
+  </ItemGroup>
+</Project>
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/UIwrapper.vcxproj.user	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup />
+</Project>
\ No newline at end of file
Binary file ui/wpf/UIwrapper/UIwrapper/app.ico has changed
Binary file ui/wpf/UIwrapper/UIwrapper/app.rc has changed
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/container.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,78 @@
+
+
+#include "stdafx.h"
+#include <stdio.h>
+
+#include "container.h"
+
+#using "UIcore.dll"
+
+UI_EXPORT void* __stdcall UIvbox(gcroot<UI::Container^> *parent, int margin, int spacing) {
+	UI::BoxContainer ^vbox = gcnew UI::BoxContainer(*parent, UI::BoxOrientation::VERTICAL, margin, spacing);
+	gcroot<UI::BoxContainer^> *container = new gcroot<UI::BoxContainer^>();
+	*container = vbox;
+	return container;
+}
+
+UI_EXPORT void* __stdcall UIhbox(gcroot<UI::Container^> *parent, int margin, int spacing) {
+	UI::BoxContainer ^hbox = gcnew UI::BoxContainer(*parent, UI::BoxOrientation::HORIZONTAL, margin, spacing);
+	gcroot<UI::BoxContainer^> *container = new gcroot<UI::BoxContainer^>();
+	*container = hbox;
+	return container;
+}
+
+UI_EXPORT void* __stdcall UIgrid(gcroot<UI::Container^> *parent, int margin, int columnspacing, int rowspacing) {
+	UI::GridContainer ^grid = gcnew UI::GridContainer(*parent, margin, columnspacing, rowspacing);
+	gcroot<UI::GridContainer^> *container = new gcroot<UI::GridContainer^>();
+	*container = grid;
+	return container;
+}
+
+UI_EXPORT void* __stdcall UIscrolledwindow(gcroot<UI::Container^> *parent) {
+	UI::ScrollViewerContainer ^scrollviewer = gcnew UI::ScrollViewerContainer(*parent);
+	gcroot<UI::ScrollViewerContainer^> *container = new gcroot<UI::ScrollViewerContainer^>();
+	*container = scrollviewer;
+	return container;
+}
+
+UI_EXPORT void* __stdcall UItabview(gcroot<UI::Container^> *parent) {
+	UI::TabViewContainer ^tabview = gcnew UI::TabViewContainer(*parent);
+	gcroot<UI::TabViewContainer^> *container = new gcroot<UI::TabViewContainer^>();
+	*container = tabview;
+	return container;
+}
+
+UI_EXPORT void __stdcall UItab(gcroot<UI::Container^> *container, char *label) {
+	UI::Container ^ct = *container;
+	ct->Layout->Label = gcnew String(label);
+}
+
+
+
+/* ------------------- layout functions ------------------- */
+
+UI_EXPORT void __stdcall UIlayout_fill(gcroot<UI::Container^> *container, int fill) {
+	UI::Container ^ct = *container;
+	ct->Layout->Fill = fill != 0;
+}
+
+UI_EXPORT void __stdcall UIlayout_hexpand(gcroot<UI::Container^> *container, int expand) {
+	UI::Container ^ct = *container;
+	ct->Layout->Hexpand = expand != 0;
+}
+
+UI_EXPORT void __stdcall UIlayout_vexpand(gcroot<UI::Container^> *container, int expand) {
+	UI::Container ^ct = *container;
+	ct->Layout->Vexpand = expand != 0;
+}
+
+UI_EXPORT void __stdcall UIlayout_gridwidth(gcroot<UI::Container^> *container, int width) {
+	UI::Container ^ct = *container;
+	ct->Layout->GridWidth = width;
+}
+
+UI_EXPORT void __stdcall UIlayout_newline(gcroot<UI::Container^> *container) {
+	UI::Container ^ct = *container;
+	ct->Layout->NewLine = true;
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/container.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,5 @@
+
+
+#pragma once
+
+#include "toolkit.h"
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/controls.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,110 @@
+
+
+#include "stdafx.h"
+#include <stdio.h>
+
+#include "controls.h"
+
+#using "UIcore.dll"
+
+/* ------------------------------ Buttons ------------------------------ */
+
+UI_EXPORT void* __stdcall UIbutton(gcroot<UI::Container^> *container, char *label, UIcallback f, void *eventdata) {
+	gcroot<Button^> *button = new gcroot<Button^>();
+
+	EventWrapper ^evt = gcnew EventWrapper(f, eventdata);
+	RoutedEventHandler ^handler = gcnew RoutedEventHandler(evt, &EventWrapper::Callback);
+
+	*button = UI::Controls::Button(*container, gcnew String(label), handler);
+	return button;
+}
+
+
+/* ------------------------------ Labels ------------------------------ */
+
+UI_EXPORT void* __stdcall UIlabel(gcroot<UI::Container^> *container, char *label, int alignment) {
+	gcroot<Label^> *control = new gcroot<Label^>();
+	*control = UI::Controls::Label(*container, gcnew String(label), alignment);
+	return control;
+}
+
+UI_EXPORT void* __stdcall UIspace(gcroot<UI::Container^> *container) {
+	gcroot<Label^> *control = new gcroot<Label^>();
+	*control = UI::Controls::Space(*container);
+	return control;
+}
+
+UI_EXPORT void* __stdcall UIseparator(gcroot<UI::Container^> *container) {
+	gcroot<Separator^> *control = new gcroot<Separator^>();
+	*control = UI::Controls::Separator(*container);
+	return control;
+}
+
+
+
+/* ------------------------------ Textarea ------------------------------ */
+
+UI_EXPORT void* __stdcall UItextarea(gcroot<UI::Container^> *container, char *text) {
+	String ^str = nullptr;
+	if (text) {
+		str = gcnew String(text);
+	}
+	
+	gcroot<UI::TextArea^> *textarea = new gcroot<UI::TextArea^>();
+	*textarea = gcnew UI::TextArea(*container, str, true);
+
+	return textarea;
+}
+
+UI_EXPORT void  __stdcall UItextarea_set(gcroot<UI::TextArea^> *textarea, char *str) {
+	(*textarea)->SetText(gcnew String(str));
+}
+
+UI_EXPORT char* __stdcall UItextarea_get(gcroot<UI::TextArea^> *textarea) {
+	String ^str = (*textarea)->GetText();
+	return (char*)(void*)Marshal::StringToHGlobalAnsi(str);
+}
+
+UI_EXPORT char* __stdcall UItextarea_getsubstr(gcroot<UI::TextArea^> *textarea, int begin, int end) {
+	String ^str = (*textarea)->GetSubString(begin, end);
+	return (char*)(void*)Marshal::StringToHGlobalAnsi(str);
+}
+
+UI_EXPORT void __stdcall UItextarea_insert(gcroot<UI::TextArea^> *textarea, int position, char *str) {
+	// TODO
+}
+
+UI_EXPORT int __stdcall UItextarea_position(gcroot<UI::TextArea^> *textarea) {
+	return (*textarea)->Position();
+}
+
+UI_EXPORT void __stdcall UItextarea_selection(gcroot<UI::TextArea^> *textarea, int *begin, int *end) {
+	// TODO
+}
+
+UI_EXPORT int __stdcall UItextarea_length(gcroot<UI::TextArea^> *textarea) {
+	return (*textarea)->Length();
+}
+
+UI_EXPORT void __stdcall UItextarea_remove(gcroot<UI::TextArea^> *textarea, int begin, int end) {
+	// TODO
+}
+
+UI_EXPORT void __stdcall UIfreestr(char *str) {
+	Marshal::FreeHGlobal((IntPtr)(void*)str);
+}
+
+
+/* ------------------------------ Textfield ------------------------------ */
+
+UI_EXPORT void* __stdcall UItextfield(gcroot<UI::Container^> *container, char *text) {
+	String ^str = nullptr;
+	if (text) {
+		str = gcnew String(text);
+	}
+
+	gcroot<UI::TextArea^> *textfield = new gcroot<UI::TextArea^>();
+	*textfield = gcnew UI::TextArea(*container, str, false);
+
+	return textfield;
+}
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/controls.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,6 @@
+
+
+#pragma once
+
+#include "toolkit.h"
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/graphics.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,63 @@
+#include "stdafx.h"
+#include <stdio.h>
+
+#include "graphics.h"
+
+#using "UIcore.dll"
+
+
+DrawEventWrapper::DrawEventWrapper(void *gc, UIdrawfunc callback, void *eventdata) {
+	this->callback = callback;
+	this->eventdata = eventdata;
+	this->gc = gc;
+	action = gcnew Action<int,int>(this, &DrawEventWrapper::Callback);
+}
+
+
+void DrawEventWrapper::Callback(int width, int height)
+{
+	if (callback)
+	{
+		UI::DrawingArea ^d = (UI::DrawingArea^)PtrToObject(gc);
+		callback(gc, eventdata, width, height);
+	}
+}
+
+
+UI_EXPORT void* __stdcall UIdrawingarea(gcroot<UI::Container^> *container, UIdrawfunc f, void *data)
+{
+	gcroot<UI::DrawingArea^> *canvas = new gcroot<UI::DrawingArea^>();
+	*canvas = gcnew UI::DrawingArea(*container);
+
+	DrawEventWrapper ^ev = gcnew DrawEventWrapper(ObjectToPtr(*canvas), f, data);
+	(*canvas)->resizeCallback = ev->action;
+
+	return canvas;
+}
+
+
+UI_EXPORT void __stdcall UIdrawingarea_redraw(gcroot<UI::DrawingArea^> *drawingarea)
+{
+	(*drawingarea)->Redraw();
+}
+
+
+/* ------------------------- drawing functions ------------------------- */
+
+UI_EXPORT void __stdcall UIgraphics_color(void *g, int red, int green, int blue)
+{
+	UI::DrawingArea ^d = (UI::DrawingArea^)PtrToObject(g);
+	d->SetColor(red, green, blue);
+}
+
+UI_EXPORT void __stdcall UIdraw_line(void *g, int x1, int y1, int x2, int y2)
+{
+	UI::DrawingArea ^d = (UI::DrawingArea^)PtrToObject(g);
+	d->DrawLine(x1, y1, x2, y2);
+}
+
+UI_EXPORT void __stdcall UIdraw_rect(void *g, int x, int y, int w, int h, int fill)
+{
+	UI::DrawingArea ^d = (UI::DrawingArea^)PtrToObject(g);
+	d->DrawRect(x, y, w, h, fill ? true : false);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/graphics.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,17 @@
+#pragma once
+
+#include "toolkit.h"
+
+typedef void(*UIdrawfunc)(void *gc, void *event, int width, int height);
+
+public ref class DrawEventWrapper {
+public:
+	UIdrawfunc callback = NULL;
+	void *eventdata = NULL;
+	void *gc;
+	Action<int,int> ^action;
+
+	DrawEventWrapper(void *gc, UIdrawfunc callback, void *eventdata);
+
+	void Callback(int width, int height);
+};
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/menu.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,26 @@
+
+#include "stdafx.h"
+#include <stdio.h>
+
+#include "menu.h"
+
+#using "UIcore.dll"
+
+UI_EXPORT void __stdcall UImenu(char *label) {
+	UI::Application::GetInstance()->Menu->AddMenu(gcnew String(label));
+}
+
+UI_EXPORT void __stdcall UIsubmenu(char *label) {
+	UI::Application::GetInstance()->Menu->AddSubMenu(gcnew String(label));
+}
+
+UI_EXPORT void __stdcall UIsubmenu_end() {
+	UI::Application::GetInstance()->Menu->EndSubMenu();
+}
+
+
+UI_EXPORT void __stdcall UImenuitem(char *label, UIcallback f, void *eventdata) {
+	ObjEventWrapper ^e = gcnew ObjEventWrapper(f, eventdata);
+	UI::Application::GetInstance()->Menu->AddMenuItem(gcnew String(label), e->GetAction());
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/menu.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,4 @@
+
+#pragma once
+
+#include "toolkit.h"
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/resource.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,3 @@
+//{{NO_DEPENDENCIES}}
+// Microsoft Visual C++ generated include file.
+// Used by app.rc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/toolbar.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,49 @@
+/*
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+*
+* Copyright 2015 Olaf Wintermann. All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are met:
+*
+*   1. Redistributions of source code must retain the above copyright
+*      notice, this list of conditions and the following disclaimer.
+*
+*   2. Redistributions in binary form must reproduce the above copyright
+*      notice, this list of conditions and the following disclaimer in the
+*      documentation and/or other materials provided with the distribution.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+* POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include "stdafx.h"
+#include <stdio.h>
+
+#include "toolbar.h"
+
+#using "UIcore.dll"
+
+UI_EXPORT void __stdcall UItoolitem(char *name, char *label, UIcallback f, void *eventdata) {
+	ObjEventWrapper ^e = gcnew ObjEventWrapper(f, eventdata);
+	UI::Application::GetInstance()->ToolBar->AddToolItem(gcnew String(name), gcnew String(label), e->GetAction());
+}
+
+
+
+
+
+UI_EXPORT void __stdcall UItoolbar_add_default(char *name) {
+	UI::Application::GetInstance()->ToolBar->AddDefault(gcnew String(name));
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/toolbar.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,32 @@
+/*
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+*
+* Copyright 2015 Olaf Wintermann. All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are met:
+*
+*   1. Redistributions of source code must retain the above copyright
+*      notice, this list of conditions and the following disclaimer.
+*
+*   2. Redistributions in binary form must reproduce the above copyright
+*      notice, this list of conditions and the following disclaimer in the
+*      documentation and/or other materials provided with the distribution.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+* POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#pragma once
+
+#include "toolkit.h"
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/toolkit.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,127 @@
+// Dies ist die Haupt-DLL.
+
+#include "stdafx.h"
+#include <stdio.h>
+
+#include "toolkit.h"
+
+#using "UIcore.dll"
+
+static UIcallback startup_func;
+void              *startup_data;
+static UIcallback open_func;
+void              *open_data;
+static UIcallback exit_func;
+void              *exit_data;
+
+public ref class AppCallbacks : public UI::IApplicationCallbacks {
+public:
+	UIcallback startupFunc = NULL;
+	void       *startupData = NULL;
+	UIcallback openFunc = NULL;
+	void       *openData = NULL;
+	UIcallback exitFunc = NULL;
+	void       *exitData = NULL;
+
+	virtual void __clrcall OnStartup() {
+		if (startupFunc) {
+			startupFunc(NULL, startupData);
+		}
+	}
+	virtual void __clrcall OnOpen() {
+		if (openFunc) {
+			openFunc(NULL, openData);
+		}
+	}
+	virtual void __clrcall OnExit() {
+		if (exitFunc) {
+			exitFunc(NULL, exitData);
+		}
+	}
+};
+
+
+void* ObjectToPtr(Object ^obj) {
+	GCHandle handle = GCHandle::Alloc(obj);
+	IntPtr pointer = GCHandle::ToIntPtr(handle);
+	return pointer.ToPointer();
+}
+
+Object^ PtrToObject(void *ptr) {
+	GCHandle h = GCHandle::FromIntPtr(IntPtr(ptr));
+	Object^ object = h.Target;
+	//h.Free();
+	return object;
+}
+
+// EventWrapper
+
+ObjEventWrapper::ObjEventWrapper(UIcallback callback, void *eventdata) {
+	this->callback = callback;
+	this->eventdata = eventdata;
+	action = gcnew Action<IntPtr>(this, &ObjEventWrapper::Callback);
+}
+
+Action<IntPtr>^ ObjEventWrapper::GetAction() {
+	return action;
+}
+
+void ObjEventWrapper::Callback(IntPtr uiobj) {
+	if (callback) {
+		callback(uiobj.ToPointer(), eventdata);
+	}
+}
+
+
+EventWrapper::EventWrapper(UIcallback callback, void *eventdata) {
+	this->callback = callback;
+	this->eventdata = eventdata;
+}
+
+void EventWrapper::Callback(Object ^sender, RoutedEventArgs ^e) {
+	if (callback) {
+		callback(NULL, eventdata);
+	}
+}
+
+
+
+UI_EXPORT void __stdcall UIinit(char *appname) {
+	UI::Application ^app = UI::Application::GetInstance();
+	app->Name = gcnew String(appname);
+}
+
+UI_EXPORT void __stdcall UIonstartup(UIcallback f, void *userdata) {
+	startup_func = f;
+	startup_data = userdata;
+}
+
+UI_EXPORT void __stdcall UIonopen(UIcallback f, void *userdata) {
+	open_func = f;
+	open_data = userdata;
+}
+
+UI_EXPORT void __stdcall UIonexit(UIcallback f, void *userdata) {
+	exit_func = f;
+	exit_data = userdata;
+}
+
+UI_EXPORT void __stdcall UImain() {
+	AppCallbacks ^ac = gcnew AppCallbacks();
+	ac->startupFunc = startup_func;
+	ac->startupData = startup_data;
+	ac->openFunc = open_func;
+	ac->openData = open_data;
+	ac->exitFunc = exit_func;
+	ac->exitData = exit_data;
+	
+	UI::Application ^app = UI::Application::GetInstance();
+	app->callbacks = ac;
+
+	Thread ^thread = app->Start();
+	thread->Join();
+}
+
+UI_EXPORT void __stdcall UIshow(gcroot<UI::MainWindow^> *window) {
+	(*window)->ShowWindow();
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/toolkit.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,42 @@
+// UIwrapper.h
+
+#pragma once
+
+#include <vcclr.h>
+
+using namespace System;
+using namespace System::Runtime::InteropServices;
+using namespace System::Threading;
+using namespace System::Windows;
+using namespace System::Windows::Controls;
+
+#define UI_EXPORT extern "C" __declspec(dllexport)
+
+extern "C" typedef void(*UIcallback)(void*, void*);
+
+void* ObjectToPtr(Object ^obj);
+Object^ PtrToObject(void *ptr);
+
+public ref class ObjEventWrapper {
+	UIcallback callback = NULL;
+	void *eventdata = NULL;
+	Action<IntPtr> ^action;
+
+public:
+	ObjEventWrapper(UIcallback callback, void *eventdata);
+
+	Action<IntPtr>^ GetAction();
+
+	void Callback(IntPtr uiobj);
+};
+
+public ref class EventWrapper {
+	UIcallback callback = NULL;
+	void *eventdata = NULL;
+	
+
+public:
+	EventWrapper(UIcallback callback, void *eventdata);
+	void Callback(Object ^sender, RoutedEventArgs ^e);
+};
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/window.cpp	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,17 @@
+
+
+#include "stdafx.h"
+#include <stdio.h>
+
+#include "window.h"
+
+#using "UIcore.dll"
+
+UI_EXPORT void* __stdcall UIwindow(char *title, void *uiobj) {
+	UI::MainWindow ^window = gcnew UI::MainWindow(gcnew String(title), IntPtr(uiobj));
+	gcroot<UI::MainWindow^> *ptr = new gcroot<UI::MainWindow^>();
+	*ptr = window;
+	return ptr;
+}
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/UIwrapper/UIwrapper/window.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,6 @@
+
+
+#pragma once
+
+#include "toolkit.h"
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/button.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,58 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "button.h"
+#include "../common/object.h"
+
+UIWIDGET ui_button(UiObject *obj, char *label, ui_callback f, void *data) {
+    UiEventData *event = NULL;
+    ui_callback callback = NULL;
+    if(f) {
+        event = malloc(sizeof(UiEventData));
+        event->obj = obj;
+        event->callback = f;
+        event->user_data = data;
+        event->value = 0;
+        callback = (ui_callback)ui_button_callback;
+    }
+    
+    UiContainer *container = uic_get_current_container(obj);
+    return UIbutton(container, label, callback, event);
+}
+
+void ui_button_callback(UiObject *obj, UiEventData *e) {
+    UiEvent event;
+    event.obj = e->obj;
+    event.document = event.obj->ctx->document;
+    event.window = event.obj->window;
+    event.intval = 0;
+    e->callback(&event, e->user_data);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/button.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,48 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef BUTTON_H
+#define	BUTTON_H
+
+#include "../ui/button.h"
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+UI_IMPORT UIWIDGET __stdcall UIbutton(void *container, char *label, ui_callback f, void *event);
+
+void ui_button_callback(UiObject *obj, UiEventData *e);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* BUTTON_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/container.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,147 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "container.h"
+#include "../common/object.h"
+
+UIWIDGET ui_vbox(UiObject *obj) {
+    return ui_vbox_sp(obj, 0, 0);
+}
+
+UIWIDGET ui_hbox(UiObject *obj) {
+    return ui_hbox_sp(obj, 0, 0);
+}
+
+UIWIDGET ui_vbox_sp(UiObject *obj, int margin, int spacing) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    UIWIDGET vbox = UIvbox(ct, margin, spacing);
+    
+    UiObject *newobj = uic_object_new(obj, vbox);
+    newobj->container = (UiContainer*)vbox;
+    uic_obj_add(obj, newobj);
+    
+    return vbox;
+}
+
+UIWIDGET ui_hbox_sp(UiObject *obj, int margin, int spacing) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    UIWIDGET hbox = UIhbox(ct, margin, spacing);
+    
+    UiObject *newobj = uic_object_new(obj, hbox);
+    newobj->container = (UiContainer*)hbox;
+    uic_obj_add(obj, newobj);
+    
+    return hbox;
+}
+
+UIWIDGET ui_grid(UiObject *obj) {
+    return ui_grid_sp(obj, 0, 0, 0);
+}
+
+UIWIDGET ui_grid_sp(UiObject *obj, int margin, int columnspacing, int rowspacing) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    UIWIDGET grid = UIgrid(ct, margin, columnspacing, rowspacing);
+    
+    UiObject *newobj = uic_object_new(obj, grid);
+    newobj->container = (UiContainer*)grid;
+    uic_obj_add(obj, newobj);
+    
+    return grid;
+}
+
+UIWIDGET ui_scrolledwindow(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    UIWIDGET scrolledwindow = UIscrolledwindow(ct);
+    
+    UiObject *newobj = uic_object_new(obj, scrolledwindow);
+    newobj->container = (UiContainer*)scrolledwindow;
+    uic_obj_add(obj, newobj);
+    
+    return scrolledwindow;
+}
+
+/*
+ * TODO: sidebar
+ */
+
+UIWIDGET ui_tabview(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    
+    UIWIDGET tabview = UItabview(ct);
+    
+    UiObject *newobj = uic_object_new(obj, tabview);
+    newobj->container = (UiContainer*)tabview;
+    uic_obj_add(obj, newobj);
+    
+    return tabview;
+}
+
+void ui_tab(UiObject *obj, char *title) {
+    UiContainer *ct = uic_get_current_container(obj);
+    UItab(ct, title);
+}
+
+
+/*
+ * -------------------- Layout Functions --------------------
+ * 
+ * functions for setting layout attributes for the current container
+ *
+ */
+
+void ui_layout_fill(UiObject *obj, UiBool fill) {
+    UiContainer *ct = uic_get_current_container(obj);
+    UIlayout_fill(ct, fill);
+}
+
+void ui_layout_hexpand(UiObject *obj, UiBool expand) {
+    UiContainer *ct = uic_get_current_container(obj);
+    UIlayout_hexpand(ct, expand);
+}
+
+void ui_layout_vexpand(UiObject *obj, UiBool expand) {
+    UiContainer *ct = uic_get_current_container(obj);
+    UIlayout_vexpand(ct, expand);
+}
+
+void ui_layout_gridwidth(UiObject *obj, int width) {
+    UiContainer *ct = uic_get_current_container(obj);
+    UIlayout_gridwidth(ct, width);
+}
+
+void ui_newline(UiObject *obj) {
+    UiContainer *ct = uic_get_current_container(obj);
+    UIlayout_newline(ct);
+}
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/container.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,59 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CONTAINER_H
+#define	CONTAINER_H
+
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+UI_IMPORT void* __stdcall UIvbox(UiContainer *parent, int margin, int spacing);
+UI_IMPORT void* __stdcall UIhbox(UiContainer *parent, int margin, int spacing);
+UI_IMPORT void* __stdcall UIgrid(UiContainer *parent, int margin, int columnspacing, int rowspacing);
+
+UI_IMPORT void* __stdcall UIscrolledwindow(UiContainer *parent);
+
+UI_IMPORT void* __stdcall UItabview(UiContainer *parent);
+UI_IMPORT void  __stdcall UItab(UiContainer *container, char *label);
+
+UI_IMPORT void __stdcall UIlayout_fill(UiContainer *container, int fill);
+UI_IMPORT void __stdcall UIlayout_hexpand(UiContainer *container, int expand);
+UI_IMPORT void __stdcall UIlayout_vexpand(UiContainer *container, int expand);
+UI_IMPORT void __stdcall UIlayout_gridwidth(UiContainer *container, int width);
+
+UI_IMPORT void __stdcall UIlayout_newline(UiContainer *container);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* CONTAINER_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/graphics.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,74 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "graphics.h"
+#include "container.h"
+#include "../../ucx/mempool.h"
+#include "../common/context.h"
+#include "../common/object.h"
+
+UIWIDGET ui_drawingarea(UiObject *obj, ui_drawfunc f, void *userdata) {
+    UiDrawEvent *eventdata = NULL;
+    ui_draw_callback cb = NULL;
+    if(f) {
+        eventdata = malloc(sizeof(UiDrawEvent));
+        eventdata->obj = obj;
+        eventdata->draw = f;
+        eventdata->userdata = userdata;
+        cb = ui_draw_event;
+    }
+    
+    UiContainer *container = uic_get_current_container(obj);
+    return UIdrawingarea(container, cb, eventdata);
+}
+
+void ui_draw_event(void *gc, UiDrawEvent *event, int width, int height) {
+    UiEvent e;
+    e.obj = event->obj;
+    e.window = e.obj->window;
+    e.document = e.obj->ctx->document;
+    e.eventdata = NULL;
+    e.intval = 0;
+    
+    UiWPFGraphics g;
+    g.g.width = width;
+    g.g.height = height;
+    g.gc = gc;
+    
+    event->draw(&e, &g.g, event->userdata);
+}
+
+
+void ui_drawingarea_mousehandler(UiObject *obj, UIWIDGET widget, ui_callback f, void *u) {
+    
+}
+
+void ui_drawingarea_getsize(UIWIDGET drawingarea, int *width, int *height) {
+    
+}
+
+void ui_drawingarea_redraw(UIWIDGET drawingarea) {
+    UIdrawingarea_redraw(drawingarea);
+}
+
+
+/* ------------------------- drawing functions ------------------------- */
+
+void ui_graphics_color(UiGraphics *g, int red, int green, int blue) {
+    UiWPFGraphics *wg = (UiWPFGraphics*)g;
+    UIgraphics_color(wg->gc, red, green, blue);
+}
+
+void ui_draw_line(UiGraphics *g, int x1, int y1, int x2, int y2) {
+    UiWPFGraphics *wg = (UiWPFGraphics*)g;
+    UIdraw_line(wg->gc, x1, y1, x2, y2);
+}
+
+void ui_draw_rect(UiGraphics *g, int x, int y, int w, int h, int fill) {
+    UiWPFGraphics *wg = (UiWPFGraphics*)g;
+    UIdraw_rect(wg->gc, x, y, w, h, fill);
+}
+
+void ui_draw_text(UiGraphics *g, int x, int y, UiTextLayout *text) {
+    
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/graphics.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,56 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/* 
+ * File:   graphics.h
+ * Author: Olaf
+ *
+ * Created on 22. Januar 2017, 18:34
+ */
+
+#ifndef GRAPHICS_H
+#define GRAPHICS_H
+
+#include "toolkit.h"
+#include "../ui/graphics.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    
+typedef struct UiDrawEvent {
+    UiObject    *obj;
+    ui_drawfunc draw;
+    void        *userdata;
+} UiDrawEvent;
+
+typedef struct UiWPFGraphics {
+    UiGraphics g;
+    void       *gc;
+} UiWPFGraphics;
+
+typedef void(*ui_draw_callback)(void *gc, UiDrawEvent *event, int width, int height);
+    
+UI_IMPORT UIWIDGET __stdcall UIdrawingarea(void *container, ui_draw_callback f, void *userdata);
+
+UI_IMPORT void __stdcall UIdrawingarea_redraw(UIWIDGET drawingarea);
+
+void ui_draw_event(void *gc, UiDrawEvent *event, int width, int height);
+
+// drawing functions
+
+UI_IMPORT void __stdcall UIgraphics_color(UiGraphics *g, int red, int green, int blue);
+UI_IMPORT void __stdcall UIdraw_line(UiGraphics *g, int x1, int y1, int x2, int y2);
+UI_IMPORT void __stdcall UIdraw_rect(UiGraphics *g, int x, int y, int w, int h, int fill);
+//void UIdraw_text(UiGraphics *g, int x, int y, UiTextLayout *text);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GRAPHICS_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/label.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "label.h"
+#include "container.h"
+#include "../../ucx/mempool.h"
+#include "../common/context.h"
+#include "../common/object.h"
+
+UIWIDGET ui_label(UiObject *obj, char *label) {
+    return UIlabel(uic_get_current_container(obj), label, 2);
+}
+
+UIWIDGET ui_llabel(UiObject *obj, char *label) {
+    return UIlabel(uic_get_current_container(obj), label, 0);
+}
+
+UIWIDGET ui_rlabel(UiObject *obj, char *label) {
+    return UIlabel(uic_get_current_container(obj), label, 1);
+}
+
+UIWIDGET ui_space(UiObject *obj) {
+    return UIspace(uic_get_current_container(obj));
+}
+
+UIWIDGET ui_separator(UiObject *obj) {
+    return UIseparator(uic_get_current_container(obj));
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/label.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,28 @@
+/* 
+ * File:   label.h
+ * Author: Olaf
+ *
+ * Created on 19. Januar 2016, 18:12
+ */
+
+#ifndef LABEL_H
+#define	LABEL_H
+
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+UI_IMPORT UIWIDGET __stdcall UIlabel(void *container, char *label, int alignment);
+
+UI_IMPORT UIWIDGET __stdcall UIspace(void *container);
+
+UI_IMPORT UIWIDGET __stdcall UIseparator(void *container);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* LABEL_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/menu.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,72 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "menu.h"
+
+void ui_menu(char *label) {
+    UImenu(label);
+}
+
+void ui_submenu(char *label) {
+    UIsubmenu(label);
+}
+
+void ui_submenu_end() {
+    UIsubmenu_end();
+}
+
+void ui_menuitem(char *label, ui_callback f, void *userdata) {
+    UIcallback cb = NULL;
+    void *e = NULL;
+    if (f) {
+        UiEventData *event = malloc(sizeof(UiEventData));
+        event->obj = NULL;
+        event->user_data = userdata;
+        event->callback = f;
+        event->value = 0;
+        cb = (UIcallback)ui_obj_callback;
+        e = event;
+    }
+    
+    UImenuitem(label, cb, e);
+}
+
+
+void ui_obj_callback(UiObject *obj, UiEventData *e) {
+    UiEvent event;
+    event.obj = obj;
+    event.window = obj->window;
+    event.intval = 0;
+    event.eventdata = NULL;
+    event.document = obj->ctx->document;
+    e->callback(&event, e->user_data);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/menu.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,32 @@
+/* 
+ * File:   menu.h
+ * Author: Olaf
+ *
+ * Created on 25. Januar 2015, 13:37
+ */
+
+#ifndef MENU_H
+#define	MENU_H
+
+#include "../ui/menu.h"
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+UI_IMPORT void __stdcall UImenu(char *label);
+UI_IMPORT void __stdcall UIsubmenu(char *label);
+UI_IMPORT void __stdcall UIsubmenu_end();
+UI_IMPORT void __stdcall UImenuitem(char *label, UIcallback f, void *udata);
+
+
+
+void ui_obj_callback(UiObject *obj, UiEventData *e);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* MENU_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/objs.mk	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,43 @@
+#
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+#
+# Copyright 2012 Olaf Wintermann. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   1. Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+WPF_SRC_DIR = ui/wpf/
+WPF_OBJPRE = $(OBJ_DIR)$(WPF_SRC_DIR)
+
+WPFOBJ = toolkit.o
+WPFOBJ += window.o
+WPFOBJ += container.o
+WPFOBJ += menu.o
+WPFOBJ += toolbar.o
+WPFOBJ += button.o
+WPFOBJ += label.o
+WPFOBJ += text.o
+WPFOBJ += graphics.o
+
+TOOLKITOBJS += $(WPFOBJ:%=$(WPF_OBJPRE)%)
+TOOLKITSOURCE += $(WPFOBJ:%.o=wpf/%.c)
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/text.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,140 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "text.h"
+
+UIWIDGET ui_textarea(UiObject *obj, UiText *value) {
+    UiContainer *container = uic_get_current_container(obj); 
+    UIWIDGET textarea = UItextarea(container, value ? value->value : NULL);
+    
+    if(value) {
+        value->get = ui_textarea_get;
+        value->set = ui_textarea_set;
+        value->getsubstr = ui_textarea_getsubstr;
+        value->insert = ui_textarea_insert;
+        value->position = ui_textarea_position;
+        value->selection = ui_textarea_selection;
+        value->length = ui_textarea_length;
+        value->remove = ui_textarea_remove;
+        value->value = NULL;
+        value->obj = textarea;
+        if(!value->undomgr) {
+            //value->undomgr = ;
+        }
+    }
+    
+    return textarea;
+}
+
+UIWIDGET ui_textarea_nv(UiObject *obj, char *varname) {
+    UiVar *var = uic_connect_var(obj->ctx, varname, UI_VAR_TEXT);
+    if(var) {
+        UiText *value = var->value;
+        return ui_textarea(obj, value);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
+
+char* ui_textarea_get(UiText *text) {
+    if(text->value) {
+        UIfreestr(text->value);
+    }
+    text->value = UItextarea_get(text->obj);
+    return text->value;
+}
+
+void ui_textarea_set(UiText *text, char *str) {
+    if(text->value) {
+        UIfreestr(text->value);
+        text->value = NULL;
+    }
+    UItextarea_set(text->obj, str);
+}
+
+char* ui_textarea_getsubstr(UiText *text, int begin, int end) {
+    if(text->value) {
+        UIfreestr(text->value);
+    }
+    text->value = UItextarea_getsubstr(text->obj, begin, end);
+    return text->value;
+}
+
+void ui_textarea_insert(UiText *text, int pos, char *str) {
+    if(text->value) {
+        UIfreestr(text->value);
+        text->value = NULL;
+    }
+    UItextarea_insert(text->obj, pos, str);
+}
+
+int ui_textarea_position(UiText *text) {
+    return UItextarea_position(text->obj);
+}
+
+void ui_textarea_selection(UiText *text, int *begin, int *end) {
+    UItextarea_selection(text->obj, begin, end);
+}
+
+int ui_textarea_length(UiText *text) {
+    return UItextarea_length(text->obj);
+}
+
+void ui_textarea_remove(UiText *text, int begin, int end) {
+    if(text->value) {
+        UIfreestr(text->value);
+        text->value = NULL;
+    }
+    UItextarea_remove(text->obj, begin, end);
+}
+
+
+UIWIDGET ui_textfield(UiObject *obj, UiString *value) {
+    UiContainer *container = uic_get_current_container(obj); 
+    UIWIDGET textfield = UItextfield(container, value ? value->value : NULL);
+    
+    if(value) {
+        // TODO
+    }
+    return textfield;
+}
+
+UIWIDGET ui_textfield_nv(UiObject *obj, char *varname) {
+    UiVar *var = uic_connect_var(obj->ctx, varname, UI_VAR_STRING);
+    if(var) {
+        UiString *value = var->value;
+        return ui_textfield(obj, value);
+    } else {
+        // TODO: error
+    }
+    return NULL;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/text.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,69 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TEXT_H
+#define	TEXT_H
+
+#include "../ui/text.h"
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+UI_IMPORT UIWIDGET __stdcall UItextarea(void *container, char *text);
+
+char* ui_textarea_get(UiText *text);
+void ui_textarea_set(UiText *text, char *str);
+char* ui_textarea_getsubstr(UiText *text, int begin, int end);
+void ui_textarea_insert(UiText *text, int pos, char *str);
+int ui_textarea_position(UiText *text);
+void ui_textarea_selection(UiText *text, int *begin, int *end);
+int ui_textarea_length(UiText *text);
+void ui_textarea_remove(UiText *text, int begin, int end);
+
+UI_IMPORT void __stdcall UItextarea_set(UIWIDGET textarea, char *str);
+UI_IMPORT char* __stdcall UItextarea_get(UIWIDGET textarea);
+UI_IMPORT char* __stdcall UItextarea_getsubstr(UIWIDGET textarea, int begin, int end);
+UI_IMPORT void __stdcall UItextarea_insert(UIWIDGET textarea, int pos, char *str);
+UI_IMPORT int __stdcall UItextarea_position(UIWIDGET textarea);
+UI_IMPORT void __stdcall UItextarea_selection(UIWIDGET textarea, int *begin, int *end);
+UI_IMPORT int __stdcall UItextarea_length(UIWIDGET textarea);
+UI_IMPORT void __stdcall UItextarea_remove(UIWIDGET textarea, int begin, int end);
+
+UI_IMPORT void __stdcall UIfreestr(char *str);
+
+
+UI_IMPORT UIWIDGET __stdcall UItextfield(void *container, char *text);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* TEXT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/toolbar.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,56 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "toolbar.h"
+#include "menu.h"
+#include "../common/context.h"
+
+void ui_toolitem(char *name, char *label, ui_callback f, void *udata) {
+    UIcallback cb = NULL;
+    void *e = NULL;
+    if (f) {
+        UiEventData *event = malloc(sizeof(UiEventData));
+        event->obj = NULL;
+        event->user_data = udata;
+        event->callback = f;
+        event->value = 0;
+        cb = (UIcallback)ui_obj_callback;
+        e = event;
+    }
+    
+    UItoolitem(name, label, cb, e);
+}
+
+void ui_toolbar_add_default(char *name) {
+    UItoolbar_add_default(name);
+}
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/toolbar.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,50 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TOOLBAR_H
+#define	TOOLBAR_H
+
+#include "../ui/toolbar.h"
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+UI_IMPORT void __stdcall UItoolitem(char *name, char *label, UIcallback callback, void *eventdata);
+
+
+UI_IMPORT void __stdcall UItoolbar_add_default(char *name);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* TOOLBAR_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/toolkit.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,66 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "toolkit.h"
+
+
+void ui_init(char *appname, int argc, char **argv) { 
+    UIinit(appname);
+}
+
+void ui_onstartup(ui_callback f, void *userdata) {
+    UIonstartup(f, userdata);
+}
+
+void ui_onopen(ui_callback f, void *userdata) {
+    UIonopen(f, userdata);
+}
+
+void ui_onexit(ui_callback f, void *userdata) {
+    UIonexit(f, userdata);
+}
+
+void ui_main() {
+    UImain();
+}
+
+void ui_show(UiObject *obj) {
+    UIshow(obj->widget);
+}
+
+void ui_set_enabled(UIWIDGET widget, int enabled) {
+    
+}
+
+void ui_set_show_all(UIWIDGET widget, int value) {
+    
+}
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/toolkit.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,66 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2014 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TOOLKIT_H
+#define	TOOLKIT_H
+
+#include <inttypes.h>
+#include "../ui/toolkit.h"
+#include "../common/context.h"
+#include "../common/object.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#define UI_IMPORT __declspec(dllimport)
+__declspec(dllimport) int  __stdcall myfunc(char *str);
+
+typedef struct UiEventData {
+    UiObject    *obj;
+    ui_callback callback;
+    void        *user_data;
+    int         value;
+} UiEventData;
+
+typedef void(*UIcallback)(void*,void*);
+
+UI_IMPORT void __stdcall UIinit(char *appname);
+
+UI_IMPORT void __stdcall UIonstartup(ui_callback f, void *userdata);
+UI_IMPORT void __stdcall UIonopen(ui_callback f, void *userdata);
+UI_IMPORT void __stdcall UIonexit(ui_callback f, void *userdata);
+UI_IMPORT void __stdcall UImain();
+UI_IMPORT void __stdcall UIshow(UIWIDGET widget);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* TOOLKIT_H */
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/window.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,49 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../ui/window.h"
+#include "../ui/properties.h"
+#include "../common/context.h"
+
+#include "window.h"
+
+UiObject* ui_window(char *title, void *window_data) {
+    UcxMempool *mp = ucx_mempool_new(256);
+    UiObject *obj = ucx_mempool_calloc(mp, 1, sizeof(UiObject));  
+    obj->widget = UIwindow(title, obj);
+    obj->ctx = uic_context(obj, mp);
+    obj->container = (UiContainer*)obj->widget;
+    //obj->window = window_data;
+    //obj->next = NULL;
+    
+    return obj;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/wpf/window.h	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,45 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2015 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef WINDOW_H
+#define	WINDOW_H
+
+#include "toolkit.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+UI_IMPORT UIWIDGET __stdcall UIwindow(char *title, void *uiobj);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* WINDOW_H */
+

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