protected virtual void OnNodeDragDroping(DragDropNodeEventArgs e)
{
if (NodeDragDroping != null)
{
NodeDragDroping(this, e);
}
}
protected override void OnDragDrop(DragEventArgs drgevent)
{
try
{
//拖拽结束
InvalidatePrevLine(true);
///获取拖拽结果
_dropResultNode = (TreeNodePro)this.GetNodeAt(PointToClient(Control.MousePosition));
///鼠标当前位置没有TreeNode，那么认为在最后一个之后
if (_dropResultNode == null)
{
_dropResultNode = (TreeNodePro)this.Nodes[this.Nodes.Count - 1];
}
///恢复一些辅助变量为初始化状态
_isDragDrop = false;
_beginPoint = Point.Empty;
///判断目标节点是否不是选择节点；或者不在选择节点的子节点内；
///
///注：(by zhucai)判断一个一个节点是否是另一节点的孙节点不能通过node.FullPath.StartWith的方式，
///因为可能出现上级节点名刚好等于当前节点祖节点的前面部分。
if (Array.IndexOf(_dropNodes, _dropResultNode) == -1 && !CheckNodeParent(_dropResultNode, _dropNodes))
{
//触发NodeDragDroping事件
DragDropNodeEventArgs ddn = new DragDropNodeEventArgs(drgevent, new DragDropResult(_dropNodes, _dropResultNode, GetDragDropResult()));
OnNodeDragDroping(ddn);
if (!ddn.Cancel)
{
/*
///先从树里删除
_dropNode.Remove();
///计算该插入的位置
int insertIndex = 0;
TreeNode parentNode = null;
switch (ddn.DragDropResult.DropType)
{
case DragDropResultType.Before:
parentNode = ddn.DragDropResult.DropPutNode.Parent;
insertIndex = ddn.DragDropResult.DropPutNode.Index;
break;
case DragDropResultType.After:
parentNode = ddn.DragDropResult.DropPutNode.Parent;
insertIndex = ddn.DragDropResult.DropPutNode.Index + 1;
break;
case DragDropResultType.Into:
parentNode = ddn.DragDropResult.DropPutNode;
insertIndex = parentNode.Nodes.Count;
break;
default:
Debug.Assert(false);
break;
}
///插入树中
if (parentNode != null)
{
parentNode.Nodes.Insert(insertIndex, (BaseTreeNode)_dropNode);
}
else
{
this.Nodes.Insert(insertIndex, (BaseTreeNode)_dropNode);
}
*/
///触发NodeDragDroped事件
OnNodeDragDroped(ddn);
}
}
//this.SelectedNodes.AddRange(_dropNodes);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
}
base.OnDragDrop(drgevent);
}