Hi,
Sorry, took some time, I was busy with some bug fixing... I started
with the Home applet example and managed to whip up a small example
(attached) that shows a transparent pop-up window.
-Kimmo
/*
gcc -Wall `pkg-config gtk+-2.0 --cflags --libs` rgba-window-example.c -o rgba-window-example
*/
#include <gtk/gtk.h>
static gboolean
handle_expose (GtkWidget *widget, GdkEventExpose *event)
{
cairo_t *cr;
/* Create cairo context */
cr = gdk_cairo_create (GDK_DRAWABLE (widget->window));
gdk_cairo_region (cr, event->region);
cairo_clip (cr);
/* Draw alpha background */
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba (cr, 0.5, 0.5, 0.5, 0.5);
cairo_paint (cr);
/* Free context */
cairo_destroy (cr);
return FALSE;
}
int main ()
{
GtkWidget *win, *label;
GdkScreen *screen;
gtk_init (NULL, NULL);
win = gtk_window_new (GTK_WINDOW_POPUP);
screen = gtk_widget_get_screen (win);
gtk_widget_set_colormap (win, gdk_screen_get_rgba_colormap (screen));
gtk_widget_set_app_paintable (win, TRUE);
gtk_widget_realize (win);
gdk_window_set_back_pixmap (win->window, NULL, FALSE);
gtk_window_move (GTK_WINDOW (win), 300, 200);
label = gtk_label_new ("This is an RGBA window");
gtk_container_add (GTK_CONTAINER (win), label);
gtk_widget_show_all (win);
g_signal_connect (win, "expose-event", G_CALLBACK (handle_expose), win);
gtk_main ();
return 0;
}
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