private static void UpdateIsShowing(DependencyObject element)
{
if (element == null)
{
return;
}
if (!Visible.IsVisible(element) ||
!Loaded.IsLoaded(element))
{
element.SetIsShowing(false);
return;
}
var isVisible = GetIsVisible(element);
if (isVisible != null)
{
element.SetIsShowing(isVisible.Value);
return;
}
var content = GetContent(element);
element.SetIsShowing(content != null);
}
static Info()
{
EventManager.RegisterClassHandler(typeof(UIElement), FrameworkElement.SizeChangedEvent, new RoutedEventHandler(OnSizeChanged));
Loaded.Track();
EventManager.RegisterClassHandler(typeof(UIElement), FrameworkElement.LoadedEvent, new RoutedEventHandler(OnLoaded));
EventManager.RegisterClassHandler(typeof(UIElement), FrameworkElement.UnloadedEvent, new RoutedEventHandler(OnUnLoaded));
EventManager.RegisterClassHandler(typeof(UIElement), Visible.IsVisibleChangedEvent, new RoutedEventHandler(OnIsVisibleChanged));
}
static Watermark()
{
EventManager.RegisterClassHandler(typeof(TextBox), FrameworkElement.SizeChangedEvent, new RoutedEventHandler(OnSizeChanged));
Loaded.Track();
EventManager.RegisterClassHandler(typeof(TextBox), FrameworkElement.LoadedEvent, new RoutedEventHandler(OnLoaded));
EventManager.RegisterClassHandler(typeof(TextBox), FrameworkElement.UnloadedEvent, new RoutedEventHandler(OnUnLoaded));
EventManager.RegisterClassHandler(typeof(TextBox), Visible.IsVisibleChangedEvent, new RoutedEventHandler(OnIsVisibleChanged));
EventManager.RegisterClassHandler(typeof(TextBox), UIElement.GotKeyboardFocusEvent, new RoutedEventHandler(OnGotKeyboardFocus));
EventManager.RegisterClassHandler(typeof(TextBox), UIElement.LostKeyboardFocusEvent, new RoutedEventHandler(OnLostKeyboardFocus));
EventManager.RegisterClassHandler(typeof(TextBox), TextBoxBase.TextChangedEvent, new RoutedEventHandler(OnTextChanged));
}
private static void UpdateIsShowing(DependencyObject o)
{
if (o is UIElement element)
{
if (!element.IsVisible ||
!Loaded.IsLoaded(element))
{
element.SetIsShowing(false);
return;
}
var template = GetTemplate(element);
var isVisible = GetIsVisible(element);
if (template != null && isVisible != null)
{
element.SetIsShowing(isVisible.Value);
return;
}
element.SetIsShowing(template != null);
}
}
