static void
drawing_area_hierarchy_changed (GtkWidget *widget,
GtkWidget *previous_toplevel)
{
DrawingArea *area = (DrawingArea *) widget;
GSimpleActionGroup *action_group;
GSimpleAction *action;
GtkWidget *toplevel;
gint i;
if (previous_toplevel && area->pad_controller)
{
gtk_widget_remove_controller (previous_toplevel,
GTK_EVENT_CONTROLLER (area->pad_controller));
area->pad_controller = NULL;
}
toplevel = gtk_widget_get_toplevel (GTK_WIDGET (area));
if (!GTK_IS_WINDOW (toplevel))
return;
action_group = g_simple_action_group_new ();
area->pad_controller = gtk_pad_controller_new (G_ACTION_GROUP (action_group),
NULL);
for (i = 0; i < G_N_ELEMENTS (pad_actions); i++)
{
if (pad_actions[i].type == GTK_PAD_ACTION_BUTTON)
{
action = g_simple_action_new (pad_actions[i].action_name, NULL);
g_object_set_data (G_OBJECT (action), "color",
(gpointer) pad_colors[i]);
g_signal_connect (action, "activate",
G_CALLBACK (on_pad_button_activate), area);
}
else
{
action = g_simple_action_new_stateful (pad_actions[i].action_name,
G_VARIANT_TYPE_DOUBLE, NULL);
g_signal_connect (action, "activate",
G_CALLBACK (on_pad_knob_change), area);
}
g_action_map_add_action (G_ACTION_MAP (action_group), G_ACTION (action));
g_object_unref (action);
}
gtk_pad_controller_set_action_entries (area->pad_controller, pad_actions,
G_N_ELEMENTS (pad_actions));
gtk_widget_add_controller (toplevel,
GTK_EVENT_CONTROLLER (area->pad_controller));
}
static void
drawing_area_unroot (GtkWidget *widget)
{
DrawingArea *area = (DrawingArea *) widget;
GtkWidget *toplevel;
toplevel = gtk_widget_get_toplevel (widget);
if (area->pad_controller)
{
gtk_widget_remove_controller (toplevel, GTK_EVENT_CONTROLLER (area->pad_controller));
area->pad_controller = NULL;
}
GTK_WIDGET_CLASS (drawing_area_parent_class)->unroot (widget);
}