Add functionality to set overall opacity of a top-level window. (#405316)

Add functionality to set overall opacity of a top-level window. (#405316)

2007-04-30  Tor Lillqvist  <tml@novell.com>

	Add functionality to set overall opacity of a top-level
	window. (#405316)

	* gtk/gtk.symbols: Add gtk_window_set_opacity and
	gtk_window_get_opacity.

	* gtk/gtkwindow.c (struct _GtkWindowPrivate,
	(gtk_window_class_init): Add opacity property, a double in the
	range [0, 1].
	(gtk_window_set_opacity, gtk_window_get_opacity): Implement.
	(gtk_window_realize): If opacity is set, call
	gdk_window_set_opacity().

	* gtk/gtkwindow.h: Declare gtk_window_set_opacity() and
	gtk_window_get_opacity().

svn path=/trunk/; revision=17731