private static void UpdateAdroner(UIElement adorned, bool isVisible, ControlTemplate controlTemplate)
{
var layer = AdornerLayer.GetAdornerLayer(adorned);
if (layer == null)
{
// if we don't have an adorner layer it's probably
// because it's too early in the window's construction
// Let's re-run at a slightly later time
Dispatcher.CurrentDispatcher.BeginInvoke(
DispatcherPriority.Loaded,
new Action <UIElement>(UpdateAdroner), adorned);
return;
}
var existingAdorner = GetInteranlAdorner(adorned);
if (existingAdorner == null)
{
if (controlTemplate != null && isVisible)
{
// show
var newAdorner = new ControlAdorner(adorned);
newAdorner.Child = new Control()
{
Template = controlTemplate, Focusable = false,
};
layer.Add(newAdorner);
SetInternalAdorner(adorned, newAdorner);
}
}
else
{
if (controlTemplate != null && isVisible)
{
// switch template
Control ctrl = existingAdorner.Child;
ctrl.Template = controlTemplate;
}
else
{
// hide
existingAdorner.Child = null;
layer.Remove(existingAdorner);
SetInternalAdorner(adorned, null);
}
}
}
public static void SetInternalAdorner(DependencyObject target, ControlAdorner value)
{
target.SetValue(InternalAdornerProperty, value);
}