4 da_draw (GtkWidget *widget,
8 GtkOffscreenWindow *offscreen = (GtkOffscreenWindow *)user_data;
10 cairo_set_source_surface (cr,
11 gtk_offscreen_window_get_surface (offscreen),
19 offscreen_damage (GtkWidget *widget,
20 GdkEventExpose *event,
23 gtk_widget_queue_draw (da);
29 da_button_press (GtkWidget *area, GdkEventButton *event, GtkWidget *button)
31 gtk_widget_set_size_request (button, 150, 60);
36 main (int argc, char **argv)
43 gtk_init (&argc, &argv);
45 offscreen = gtk_offscreen_window_new ();
47 button = gtk_button_new_with_label ("Test");
48 gtk_widget_set_size_request (button, 50, 50);
49 gtk_container_add (GTK_CONTAINER (offscreen), button);
50 gtk_widget_show (button);
52 gtk_widget_show (offscreen);
54 /* Queue exposures and ensure they are handled so
55 * that the result is uptodate for the first
56 * expose of the window. If you want to get further
57 * changes, also track damage on the offscreen
60 gtk_widget_queue_draw (offscreen);
62 window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
63 g_signal_connect (window, "delete-event",
64 G_CALLBACK (gtk_main_quit), window);
65 da = gtk_drawing_area_new ();
66 gtk_container_add (GTK_CONTAINER (window), da);
73 g_signal_connect (offscreen,
75 G_CALLBACK (offscreen_damage),
78 gtk_widget_add_events (da, GDK_BUTTON_PRESS_MASK);
79 g_signal_connect (da, "button_press_event", G_CALLBACK (da_button_press),
82 gtk_widget_show_all (window);