Hi,
Thanks.
Actually I tried return TRUE before, but it causes bottom_image to
never be drawn.
What I want is top_image on top of bottom_image.
Richard
On 03/12/2010 10:55 AM, Lucas Hermann Negri wrote:
On Thu, Mar 11, 2010 at 11:41 PM, Richard Kung <richardkung linpus com> wrote:
Hi,
I want to use cairo to draw on top of a window but don't know how to achieve
it.
Below is my code.
bottom_image is always on top of top_image.
Any suggestion for beginners is welcome.
Richard
#include <cairo.h>
#include <gtk/gtk.h>
cairo_surface_t *top_image;
GtkWidget *bottom_image;
static gboolean on_expose_event(GtkWidget *widget, GdkEventExpose *event,
gpointer data)
{
cairo_t *cr;
cr = gdk_cairo_create(widget->window);
cairo_set_source_surface(cr, top_image, 0, 0);
cairo_paint(cr);
cairo_destroy(cr);
return FALSE;
}
int main(int argc, char *argv[])
{
GtkWidget *window;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
top_image = cairo_image_surface_create_from_png("top.png");
bottom_image = gtk_image_new_from_file("bottom.png");
gtk_container_add(GTK_CONTAINER(window), bottom_image);
g_signal_connect(window, "expose-event", G_CALLBACK (on_expose_event),
NULL);
g_signal_connect(window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
gtk_widget_set_app_paintable(window, TRUE);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 200, 200);
gtk_widget_show_all(window);
gtk_main();
cairo_surface_destroy(top_image);
return 0;
}
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Your callback should return TRUE, to indicate that the event shouldn't
be propagated further.
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