private static void CreatePreviewAdorner()
{
// Clear if there is an existing adorner
RemovePreviewAdorner();
AdornerLayer layer = AdornerLayer.GetAdornerLayer(GetTopContainer());
UIElement feedbackUI = _currentSourceAdvisor.GetVisualFeedback(_draggedElt);
_overlayElt = new DropPreviewAdorner(feedbackUI, _draggedElt, layer);
layer.Add(_overlayElt);
}
private static void RemovePreviewAdorner()
{
if (_overlayElt != null)
{
AdornerLayer.GetAdornerLayer(GetTopContainer()).Remove(_overlayElt);
_overlayElt = null;
}
}
static void CreatePreviewAdorner(object sender, DragEventArgs e)
{
// Set the Drag source UI
IDropTargetAdvisor adv = GetDropTargetAdvisor(sender as FrameworkElement);
adv.TargetUI = sender as UIElement;
// get the data
// get the UIFeedback
UIFeedback = adv.GetVisualFeedback(e.Data);
DoubleAnimation anim = new DoubleAnimation(0.75, new Duration(TimeSpan.FromMilliseconds(500)));
anim.From = 0.25;
anim.AutoReverse = true;
anim.RepeatBehavior = RepeatBehavior.Forever;
UIFeedback.BeginAnimation(UIElement.OpacityProperty, anim);
UIFeedback.IsHitTestVisible = false;
// add it to the adornment layer
AdornerLayer layer = AdornerLayer.GetAdornerLayer(sender as UIElement);
Overlay = new DropPreviewAdorner(UIFeedback, sender as UIElement, layer);
layer.Add(Overlay);
Overlay.Location = GetOverlaypoint(sender, e);
}
