private static void UnregisterTextElement(DependencyObject element)
{
if (element == null)
{
return;
}
// Remove overlay text control from adorner.
OverlayTextAdorner adorner = (OverlayTextAdorner)element.GetValue(OverlayTextAdornerProperty);
UIElement adornedElement = (UIElement)element.GetValue(OverlayTextAdornerHolderProperty);
if (adornedElement != null && adorner != null)
{
adorner.UnlinkOverlayTextControl();
AdornerLayer adornerLayer = adornedElement.GetAdornerLayer();
if (adornerLayer != null)
{
adornerLayer.Remove(adorner);
}
}
element.ClearValue(OverlayTextAdornerProperty);
element.ClearValue(OverlayTextAdornerHolderProperty);
UnhookTargetElementEventHandlers(element);
}
private static void RegisterTextElement(DependencyObject element)
{
if (element == null)
{
return;
}
UIElement adornedElement = element.GetContainingElement();
if (adornedElement == null)
{
// No parent element
return;
}
AdornerLayer adornerLayer = adornedElement.GetAdornerLayer();
if (adornerLayer == null)
{
// No adorner layer
return;
}
OverlayTextAdorner adorner = new OverlayTextAdorner(adornedElement);
OverlayTextControl overlayTextControl = new OverlayTextControl();
adorner.LinkOverlayTextControl(element, overlayTextControl);
adornerLayer.Add(adorner);
element.SetValue(OverlayTextAdornerProperty, adorner);
element.SetValue(OverlayTextAdornerHolderProperty, adornedElement);
HookTargetElementEventHandlers(element);
}
private static void OnPasswordChanged(object sender, RoutedEventArgs e)
{
PasswordBox passwordBox = sender as PasswordBox;
if (passwordBox == null)
{
return;
}
OverlayTextAdorner adorner = (OverlayTextAdorner)passwordBox.GetValue(OverlayTextAdornerProperty);
if (adorner != null)
{
adorner.OnTargetElementTextChanged(passwordBox.Password);
}
}
private static void OnTextChanged(object sender, TextChangedEventArgs e)
{
TextBox textBox = sender as TextBox;
if (textBox == null)
{
return;
}
OverlayTextAdorner adorner = (OverlayTextAdorner)textBox.GetValue(OverlayTextAdornerProperty);
if (adorner != null)
{
adorner.OnTargetElementTextChanged(textBox.Text);
}
}