private static void OnHiddenUiElementChanged(object sender, DependencyPropertyChangedEventArgs e)
{
var uiElement = (UIElement)sender;
if (e.OldValue != null)
{
GetVisibilityTimer((UIElement)e.OldValue).Dispose();
}
if (e.NewValue == null)
{
uiElement.MouseLeftButtonDown -= MouseDownEvent;
SetVisibilityTimer(uiElement, null);
}
else if (e.OldValue == null)
{
var hiddenUiElement = (UIElement)e.NewValue;
hiddenUiElement.Visibility = Visibility.Collapsed;
uiElement.MouseLeftButtonDown += MouseDownEvent;
var visibilityTimer = new PanelControlTimer(hiddenUiElement);
SetVisibilityTimer(uiElement, visibilityTimer);
}
}
private static void SetVisibilityTimer(UIElement uiElement, PanelControlTimer value)
{
uiElement.SetValue(VisibilityTimerProperty, value);
}