public static void SetWinOpacity(Gtk.Window win, double opacity)
{
CompositeUtils.ChangeProperty(win.GdkWindow,
Atom.Intern("_NET_WM_WINDOW_OPACITY", false),
Atom.Intern("CARDINAL", false),
PropMode.Replace,
new uint [] { (uint)(0xffffffff * opacity) });
}
public WindowOpacityFader(Gtk.Window win, double target, double msec)
{
this.win = win;
win.Mapped += HandleMapped;
win.Unmapped += HandleUnmapped;
fadin = new DoubleAnimation(0.0, target, TimeSpan.FromMilliseconds(msec), opacity => {
CompositeUtils.SetWinOpacity(win, opacity);
});
}
public void HandleMapped(object sender, EventArgs args)
{
bool composited = CompositeUtils.SupportsHint(win.Screen, "_NET_WM_WINDOW_OPACITY");
if (!composited)
{
return;
}
CompositeUtils.SetWinOpacity(win, 0.0);
fadin.Start();
}
public static bool IsComposited(Screen screen)
{
bool composited;
try {
composited = gdk_screen_is_composited(screen.Handle);
} catch (EntryPointNotFoundException) {
Log.Debug("query composite manager locally");
Atom atom = Atom.Intern(String.Format("_NET_WM_CM_S{0}", screen.Number), false);
composited = Gdk.Selection.OwnerGetForDisplay(screen.Display, atom) != null;
}
// FIXME check for WINDOW_OPACITY so that we support compositing on older composite manager
// versions before they started supporting the real check given above
if (!composited)
{
composited = CompositeUtils.SupportsHint(screen, "_NET_WM_WINDOW_OPACITY");
}
return(composited);
}