private void End()
{
_treeView.PreviewMouseMove -= OnMouseMove;
_adornerLayer.Remove(_panelAdorner);
_panelAdorner = null;
if (_draggingContainer != null)
{
OnCompleted?.Invoke(_overDragArea, _overlapItem, _draggingContainer);
}
_overDragArea = OverlapArea.Out;
_overlapItem = null;
_draggingContainer = null;
}
private void Start()
{
if (_panelAdorner != null || _draggingContainer == null)
{
return;
}
if (_adornerLayer == null)
{
_adornerLayer = AdornerLayer.GetAdornerLayer(_treeView);
}
if (_panelAdorner == null)
{
_panelAdorner = GetPanelAdorner(_treeView, _draggingContainer);
_adornerLayer.Add(_panelAdorner);
}
DragDrop.AddQueryContinueDragHandler(_treeView, OnQueryContinueDrag);
DragDrop.DoDragDrop(_treeView, _draggingContainer.DataContext, DragDropEffects.Move);
DragDrop.RemoveQueryContinueDragHandler(_treeView, OnQueryContinueDrag);
End();
}
