private static void MyIsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e) { if (sender is UserControl c) { IVisibilityChanged f = GetVisibilityActionChanged(c); if (f != null) { if ((bool)e.NewValue) { f.Showing(); } else { f.Hiding(); } } } }
public static void SetVisibilityActionChanged(DependencyObject sender, IVisibilityChanged value) => sender.SetValue(VisibilityActionChangedProperty, value);