mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-11-19 09:50:06 +00:00
332652f702
This requires changes to all the offscreen surface getters that used to return a GdkPixmap before.
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
#include <gtk/gtk.h>
|
|
|
|
static gboolean
|
|
da_expose (GtkWidget *widget,
|
|
GdkEventExpose *event,
|
|
gpointer user_data)
|
|
{
|
|
GtkOffscreenWindow *offscreen = (GtkOffscreenWindow *)user_data;
|
|
cairo_surface_t *surface;
|
|
cairo_t *cr;
|
|
|
|
if (gtk_widget_is_drawable (widget))
|
|
{
|
|
surface = gtk_offscreen_window_get_surface (offscreen);
|
|
|
|
cr = gdk_cairo_create (gtk_widget_get_window (widget));
|
|
cairo_set_source_surface (cr, surface, 50, 50);
|
|
cairo_paint (cr);
|
|
cairo_destroy (cr);
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
static gboolean
|
|
offscreen_damage (GtkWidget *widget,
|
|
GdkEventExpose *event,
|
|
GtkWidget *da)
|
|
{
|
|
gtk_widget_queue_draw (da);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
da_button_press (GtkWidget *area, GdkEventButton *event, GtkWidget *button)
|
|
{
|
|
gtk_widget_set_size_request (button, 150, 60);
|
|
return TRUE;
|
|
}
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
GtkWidget *window;
|
|
GtkWidget *button;
|
|
GtkWidget *offscreen;
|
|
GtkWidget *da;
|
|
|
|
gtk_init (&argc, &argv);
|
|
|
|
offscreen = gtk_offscreen_window_new ();
|
|
|
|
button = gtk_button_new_with_label ("Test");
|
|
gtk_widget_set_size_request (button, 50, 50);
|
|
gtk_container_add (GTK_CONTAINER (offscreen), button);
|
|
gtk_widget_show (button);
|
|
|
|
gtk_widget_show (offscreen);
|
|
|
|
/* Queue exposures and ensure they are handled so
|
|
* that the result is uptodate for the first
|
|
* expose of the window. If you want to get further
|
|
* changes, also track damage on the offscreen
|
|
* as done above.
|
|
*/
|
|
gtk_widget_queue_draw (offscreen);
|
|
|
|
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
|
|
g_signal_connect (window, "delete-event",
|
|
G_CALLBACK (gtk_main_quit), window);
|
|
da = gtk_drawing_area_new ();
|
|
gtk_container_add (GTK_CONTAINER (window), da);
|
|
|
|
g_signal_connect (da,
|
|
"expose-event",
|
|
G_CALLBACK (da_expose),
|
|
offscreen);
|
|
|
|
g_signal_connect (offscreen,
|
|
"damage-event",
|
|
G_CALLBACK (offscreen_damage),
|
|
da);
|
|
|
|
gtk_widget_add_events (da, GDK_BUTTON_PRESS_MASK);
|
|
g_signal_connect (da, "button_press_event", G_CALLBACK (da_button_press),
|
|
button);
|
|
|
|
gtk_widget_show_all (window);
|
|
|
|
gtk_main();
|
|
|
|
return 0;
|
|
}
|