#include <glib.h>
#include <gtk/gtk.h>

/* gcc -Wall `pkg-config --cflags --libs gtk+-2.0` -o widgetmenu widgetmenu.c */

void
print_data (GtkWidget *widget,
            gpointer   data)
{
  g_printerr ("%s\n", (gchar *) data);
}


static void
menuitem_unclickify (GtkWidget *mitem,
                     gpointer   data)
{
  g_return_if_fail (GTK_IS_MENU_ITEM (mitem));

  gdk_window_hide (GTK_MENU_ITEM (mitem)->event_window);
}


gboolean
scale_button_event (GtkWidget      *widget,
                    GdkEventButton *bevent,
                    gpointer        data)
{
  static guint handler = 0;

  if (bevent->type == GDK_BUTTON_PRESS)
    handler = g_signal_connect (data, "cancel",
                                G_CALLBACK (g_signal_stop_emission_by_name),
                                "cancel");

  if (handler && bevent->type == GDK_BUTTON_RELEASE)
    {
      g_signal_handler_disconnect (data, handler);
      handler = 0;
    }

  return FALSE;
}


void
open_menu (GtkButton *button,
           gpointer   data)
{
  static GtkWidget *menu = NULL;
  GtkWidget *mitem, *widget;

  if (!menu)
    {
      menu = g_object_new (GTK_TYPE_MENU,
                           NULL);

      mitem = gtk_menu_item_new ();
      g_signal_connect_after (G_OBJECT (mitem), "map-event",
                              G_CALLBACK (menuitem_unclickify),
                              NULL);

      widget = gtk_hscale_new_with_range (0, 9, 1);
      g_signal_connect (G_OBJECT (widget), "value_changed",
                        G_CALLBACK (print_data),
                        "Value in menu changed");
      g_signal_connect (G_OBJECT (widget), "button-press-event",
                        G_CALLBACK (scale_button_event),
                        menu);
      g_signal_connect (G_OBJECT (widget), "button-release-event",
                        G_CALLBACK (scale_button_event),
                        menu);

      gtk_container_add (GTK_CONTAINER (mitem), widget);
      gtk_menu_shell_append (GTK_MENU_SHELL (menu), mitem);
      gtk_widget_show_all (mitem);

      mitem = gtk_menu_item_new_with_label ("Menu Item");
      gtk_menu_shell_append (GTK_MENU_SHELL (menu), mitem);
      g_signal_connect (G_OBJECT (mitem), "activate",
                        G_CALLBACK (print_data),
                        "item 2 activated");
      gtk_widget_show_all (mitem);

      mitem = gtk_separator_menu_item_new();
      gtk_menu_shell_append (GTK_MENU_SHELL (menu), mitem);
      gtk_widget_show_all (mitem);

      mitem = gtk_menu_item_new_with_label ("Menu Item 2");
      gtk_menu_shell_append (GTK_MENU_SHELL (menu), mitem);
      g_signal_connect (G_OBJECT (mitem), "activate",
                        G_CALLBACK (print_data),
                        "item 3 activated");
      gtk_widget_show_all (mitem);
    }


  gtk_menu_popup (GTK_MENU (menu),
                  NULL, NULL, NULL, NULL,
                  1, GDK_CURRENT_TIME);

}

gint
main (gint argc, char **argv)
{
  GtkWidget *widget, *window;
  gtk_init (&argc, &argv);

  widget = gtk_button_new_with_label ("Open Menu");
  g_signal_connect (widget, "clicked", G_CALLBACK (open_menu), NULL);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_container_add (GTK_CONTAINER (window), widget);

  gtk_widget_show_all (window);
  gtk_main ();
  return 0;
}