private static void ShouldTrackFillChangeChanged(DependencyObject target, DependencyPropertyChangedEventArgs args)
{
Ellipse ellipse = (Ellipse)target;
DependencyPropertyWatcher <Brush> watcher = GetEllipseFillWatcher(ellipse);
if (watcher != null)
{
watcher.Dispose();
}
if ((bool)args.NewValue)
{
watcher = new DependencyPropertyWatcher <Brush>(ellipse, "Fill", Ellipse_FillChanged);
SetEllipseFillWatcher(ellipse, watcher);
}
}
private static void SetEllipseFillWatcher(DependencyObject obj, DependencyPropertyWatcher <Brush> value)
{
obj.SetValue(EllipseFillWatcherProperty, value);
}