private void DetachAdorners()
{
if (myDropAdorner != null)
{
myDropAdorner.Dispose();
myDropAdorner = null;
}
if (myDragAdorner != null)
{
myDragAdorner.Dispose();
myDragAdorner = null;
}
}
private void InitializeDropAdorner(ItemsControl itemsControl, DragEventArgs e)
{
if (myDropAdorner == null)
{
var adornerLayer = AdornerLayer.GetAdornerLayer(itemsControl);
UIElement itemContainer = UIHelpers.GetItemContainerFromPointInItemsControl(itemsControl, e.GetPosition(itemsControl));
if (adornerLayer != null && itemContainer != null)
{
bool isPointInTopHalf = IsDropPointBeforeItem(itemsControl, e);
bool isOrientationHorizontal = (this.DropIndication == Orientation.Horizontal);
myDropAdorner = new DropAdorner(isPointInTopHalf, isOrientationHorizontal, itemContainer, adornerLayer);
}
}
}