private void RemoveAdornerLayer()
{
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(adornerContainer);
if (adornerLayer != null) {
adornerLayer.Remove(pickupDragAdorner);
pickupDragAdorner = null;
}
}
private bool InitializeAdornerLayer()
{
// Create a brush which will paint the ListViewItem onto
// a visual in the adorner layer.
VisualBrush brush = new VisualBrush(pickupElement);
adornerContainer = (UIElement)this.Parent;
// Create an element which displays the source item while it is dragged.
this.pickupDragAdorner = new DragAdorner(adornerContainer, pickupElement.RenderSize, brush);
this.pickupDragAdorner.UseLayoutRounding = true;
this.pickupDragAdorner.SnapsToDevicePixels = true;
AdornerLayer layer = AdornerLayer.GetAdornerLayer(adornerContainer);
if (layer != null) {
layer.Add(pickupDragAdorner);
return true;
}
return false;
}