diff -r 000000000000 -r 804d8803eade ui/gtk/button.c
--- /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;
+}
+