diff -r 4e0b38bbd6c4 -r 479209198de3 ui/gtk/display.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/gtk/display.c	Wed Nov 22 08:47:52 2017 +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;
+}