private void RemoveAdorners()
{
if (_draggedAdorner != null)
{
AdornerLayer.Remove(_draggedAdorner);
}
_draggedAdorner = null;
if (_insertionAdorner != null)
{
AdornerLayer.Remove(_insertionAdorner);
}
_insertionAdorner = null;
}
private void UpdateInsertionAdorner(Point currentPosition, DependencyObject obj)
{
FrameworkElement listViewItem = Helpers.WPFVisualHelper.FindAncestor <ListBoxItem>(obj);
if (listViewItem != null)
{
if (_insertionAdorner == null)
{
_insertionAdorner = new InsertionAdorner(listViewItem);
AdornerLayer.Add(_insertionAdorner);
}
currentPosition = TargetElement.TranslatePoint(currentPosition, listViewItem);
double halfHeight = listViewItem.ActualHeight / 2;
_insertionAdorner.Position = (currentPosition.Y <= halfHeight) ?
InsertionAdorner.InsertionPosition.Top : InsertionAdorner.InsertionPosition.Bottom;
}
else
{
RemoveAdorners();
}
}