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);
}
private static void DropTarget_PreviewDragEnter(object sender, DragEventArgs e)
{
// Get the current drop target advisor
CurrentDropTargetAdvisor = GetDropTargetAdvisor(sender as DependencyObject);
if (UpdateEffects(sender, e) == false)
{
return;
}
// Setup the preview Adorner
UIElement feedbackUI = CurrentDropTargetAdvisor.GetVisualFeedback(e.Data);
_offsetPoint = CurrentDropTargetAdvisor.ApplyMouseOffset
? (Point)e.Data.GetData(DragOffsetFormat)
:
new Point();
CreatePreviewAdorner(sender as UIElement, feedbackUI);
e.Handled = true;
}