4 da_expose (GtkWidget *widget,
8 GtkOffscreenWindow *offscreen = (GtkOffscreenWindow *)user_data;
12 if (GTK_WIDGET_DRAWABLE (widget))
14 pixmap = gtk_offscreen_window_get_pixmap (offscreen);
16 cr = gdk_cairo_create (widget->window);
17 gdk_cairo_set_source_pixmap (cr, pixmap, 50, 50);
26 offscreen_damage (GtkWidget *widget,
27 GdkEventExpose *event,
30 gtk_widget_queue_draw (da);
36 da_button_press (GtkWidget *area, GdkEventButton *event, GtkWidget *button)
38 gtk_widget_set_size_request (button, 150, 60);
43 main (int argc, char **argv)
50 gtk_init (&argc, &argv);
52 offscreen = gtk_offscreen_window_new ();
54 button = gtk_button_new_with_label ("Test");
55 gtk_widget_set_size_request (button, 50, 50);
56 gtk_container_add (GTK_CONTAINER (offscreen), button);
57 gtk_widget_show (button);
59 gtk_widget_show (offscreen);
61 /* Queue exposures and ensure they are handled so
62 * that the result is uptodate for the first
63 * expose of the window. If you want to get further
64 * changes, also track damage on the offscreen
67 gtk_widget_queue_draw (offscreen);
69 window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
70 g_signal_connect (window, "delete-event",
71 G_CALLBACK (gtk_main_quit), window);
72 da = gtk_drawing_area_new ();
73 gtk_container_add (GTK_CONTAINER (window), da);
77 G_CALLBACK (da_expose),
80 g_signal_connect (offscreen,
82 G_CALLBACK (offscreen_damage),
85 gtk_widget_add_events (da, GDK_BUTTON_PRESS_MASK);
86 g_signal_connect (da, "button_press_event", G_CALLBACK (da_button_press),
89 gtk_widget_show_all (window);