centering child dialogs on parent windows in gtk+ 2.0

[Michael Meeks <michael ximian com>]

Hello,

	I'm attempting to port this to Gtk+ 2.0, essentially it uses
set_uposition to center a child over it's parent when it's not a
transient, nor modal dialog:

static void
center_dialog_over_rect (GtkWindow *window, GdkRectangle rect)
{
	fit_rect_on_screen (&rect);
	gtk_widget_set_uposition (GTK_WIDGET (window), 
		rect.x + rect.width / 2 
			- GTK_WIDGET (window)->allocation.width / 2,
		rect.y + rect.height / 2
			- GTK_WIDGET (window)->allocation.height / 2);
}

static void
center_dialog_over_window (GtkWindow *window, GtkWindow *over)
{
	GdkRectangle rect;
	int x, y, w, h;

	gdk_window_get_root_origin (GTK_WIDGET (over)->window, &x, &y);
	gdk_window_get_size (GTK_WIDGET (over)->window, &w, &h);
	rect.x = x;
	rect.y = y;
	rect.width = w;
	rect.height = h;
	center_dialog_over_rect (window, rect);
}
	I tried something like:

	GdkGeometry geometry = { 0 };
	geometry.win_gravity = GDK_GRAVITY_CENTER;
	gtk_window_set_geometry_hints (window,
				       GTK_WIDGET (over),
				       &geometry,
				       GDK_HINT_WIN_GRAVITY);

	mainly because it had the text CENTER in it :-) this appeared to have
no effect whatsoever - is that sawfish brokenness, or is this totally
the wrong way to do it ? what is the right way ? advice much
appreciated.

	Regards,

		Michael.

-- 
 mmeeks gnu org  <><, Pseudo Engineer, itinerant idiot