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);
}
/// <summary>
/// Unlinks current <see cref="OverlayTextControl"/> as the visual child of itself.
/// </summary>
public void UnlinkOverlayTextControl()
{
if (overlayTextControl == null)
{
return;
}
overlayTextControl.OverlayTextAdorner = null;
RemoveVisualChild(overlayTextControl);
overlayTextControl = null;
}
/// <summary>
/// Links <see cref="OverlayTextControl"/> as the visual child of itself.
/// </summary>
/// <param name="element">
/// The <see cref="DependencyObject"/> to retrieve the attached properties.
/// </param>
/// <param name="targetOverlayTextControl">
/// The <see cref="OverlayTextControl"/> to link for.
/// </param>
public void LinkOverlayTextControl(DependencyObject element, OverlayTextControl targetOverlayTextControl)
{
if (overlayTextControl != null || element == null ||
(targetOverlayTextControl == null || targetOverlayTextControl.OverlayTextAdorner != null))
{
return;
}
overlayTextControl = targetOverlayTextControl;
overlayTextControl.OverlayTextAdorner = this;
overlayTextControl.IsEnabled = (bool)element.GetValue(UIElement.IsEnabledProperty);
overlayTextControl.Text = OverlayTextService.GetText(element);
overlayTextControl.Style = OverlayTextService.GetOverlayStyle(element);
AddVisualChild(overlayTextControl);
}