/* Compile with :
 * gcc -Wall -g stuck.c -o stuck `pkg-config --cflags gtk+-2.0` `pkg-config --libs gtk+-2.0`
 */
#include <gtk/gtk.h>

static gboolean
popup_grab_on_window (GdkWindow *window,
		      guint32    activate_time,
		      gboolean   grab_keyboard)
{
  if ((gdk_pointer_grab (window, TRUE,
			 GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
			 GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK |
			 GDK_POINTER_MOTION_MASK,
			 NULL, NULL, activate_time) == 0))
    {
      if (!grab_keyboard ||
	  gdk_keyboard_grab (window, TRUE,
			     activate_time) == 0)
	return TRUE;
      else
	{
	  gdk_display_pointer_ungrab (gdk_drawable_get_display (window),
				      activate_time);
	  return FALSE;
	}
    }

  return FALSE;
}

static void hello( GtkWidget *widget,
                   gpointer   data )
{
    g_print ("So long!\n");
}

static gboolean delete_event( GtkWidget *widget,
                              GdkEvent  *event,
                              gpointer   data )
{
    g_print ("Gah, you got me!\n");

    return TRUE;
}

/* Another callback */
static void destroy( GtkWidget *widget,
                     gpointer   data )
{
    gtk_main_quit ();
}

int main( int   argc,
          char *argv[] )
{
    GtkWidget *window;
    GtkWidget *button;
    
    gtk_init (&argc, &argv);
    
    /* create a new window */
    window = gtk_window_new (GTK_WINDOW_POPUP);
    
    g_signal_connect (G_OBJECT (window), "delete_event",
		      G_CALLBACK (delete_event), NULL);
    
    g_signal_connect (G_OBJECT (window), "destroy",
		      G_CALLBACK (destroy), NULL);
    
    gtk_container_set_border_width (GTK_CONTAINER (window), 10);
    
    button = gtk_button_new_with_label ("You're stuck...\nUntil you click here!");
    
    g_signal_connect (G_OBJECT (button), "clicked",
		      G_CALLBACK (hello), NULL);
    
    g_signal_connect_swapped (G_OBJECT (button), "clicked",
			      G_CALLBACK (gtk_widget_destroy),
                              G_OBJECT (window));
    
    gtk_container_add (GTK_CONTAINER (window), button);
    
    gtk_widget_show (button);
    
    /* and the window */
    gtk_widget_show (window);
    gtk_window_set_position (GTK_WINDOW (window), GTK_WIN_POS_CENTER_ALWAYS);
    gtk_widget_grab_focus (window);
    popup_grab_on_window (window->window, GDK_CURRENT_TIME, TRUE);

    gtk_main ();
    
    return 0;
}