VitNX_TreeView.OnMouseMove Method

protected override void OnMouseMove(MouseEventArgs e)
 {
     if (_provisionalDragging)
     {
         if (OffsetMousePosition != _dragPos)
         {
             StartDrag();
             HandleDrag();
             return;
         }
     }
 
     if (IsDragging)
     {
         if (_dropNode != null)
         {
             var rect = GetNodeFullRowArea(_dropNode);
             if (!rect.Contains(OffsetMousePosition))
             {
                 _dropNode = null;
                 Invalidate();
             }
         }
     }
 
     CheckHover();
 
     if (IsDragging)
     {
         HandleDrag();
     }
 
     base.OnMouseMove(e);
 }