Re: Property notify on root window in Gtk2.0

[Owen Taylor <otaylor redhat com>]

Peter Zelezny <pzel dodo com au> writes:

> Hi All,
>
> Could somone suggest a way to get property notifies on the root window 
> using GTK2's signal system?
>
> In 1.2, I'd do it something like this:
>
> static gboolean
> handle_property_notify (GtkWidget *widget, GdkEventProperty *event,
>                       gpointer user_data)
> {
>       ...
> }
>
> {
>       proxy_invisible = gtk_invisible_new ();
>       /* Make the root window send events to the invisible proxy widget */
>       gdk_window_set_user_data (GDK_ROOT_PARENT (), proxy_invisible);
>       /* Select for PropertyNotify events from the root window */
>       XSelectInput (GDK_DISPLAY (), GDK_ROOT_WINDOW (), PropertyChangeMask);
>       g_signal_connect (G_OBJECT (proxy_invisible), "property_notify_event",
>                       G_CALLBACK (handle_property_notify), NULL);
>       gtk_widget_show (proxy_invisible);
> }

I'd suggest that gdk_window_add_filter() and dealing with the raw X events
is the best approach. (I'd think the above would still work, but it's 
definitely a hack.)

Regards,
                                        Owen