/// <summary>
/// Internal method to show the adorner.
/// </summary>
private void ShowAdornerInternal()
{
if (this.adorner != null)
{
// Already adorned.
return;
}
if (this.AdornerContent != null)
{
if (this.adornerLayer == null)
{
this.adornerLayer = AdornerLayer.GetAdornerLayer(this);
}
if (this.adornerLayer != null)
{
FrameworkElement adornedControl = this; // The control to be adorned defaults to 'this'.
if (!string.IsNullOrEmpty(this.AdornedTemplatePartName))
{
// If 'AdornedTemplatePartName' is set to a valid string then search the visual-tree
// for a UI element that has the specified part name. If we find it then use it as the
// adorned control, otherwise throw an exception.
adornedControl = FindNamedChild(this, this.AdornedTemplatePartName);
if (adornedControl == null)
{
throw new ApplicationException("Failed to find a FrameworkElement in the visual-tree with the part name '" + this.AdornedTemplatePartName + "'.");
}
}
this.adorner = new FrameworkElementAdorner(
this.AdornerContent,
adornedControl,
this.HorizontalAdornerPlacement,
this.VerticalAdornerPlacement,
this.AdornerOffsetX,
this.AdornerOffsetY);
this.adornerLayer.Add(this.adorner);
this.UpdateAdornerDataContext();
}
}
this.adornerShowState = AdornerShowState.Visible;
}
/// <summary>
/// Internal method to hide the adorner.
/// </summary>
private void HideAdornerInternal()
{
if (this.adornerLayer == null || this.adorner == null)
{
// Not already adorned.
return;
}
// Stop the timer that might be about to fade out the adorner.
this.closeAdornerTimer.Stop();
this.adornerLayer.Remove(this.adorner);
this.adorner.DisconnectChild();
this.adorner = null;
this.adornerLayer = null;
// Ensure that the state of the adorned control reflects that the the adorner is no longer.
this.adornerShowState = AdornerShowState.Hidden;
}
