treeview如何设置，禁止节点往子节点处拖动？

JeffryLI

本帖最后由 ffff666666 于 2018-11-30 17:49 编辑

namespace DragAndDrop
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
c1TreeView1.AllowDrop = true;
c1TreeView2.AllowDrop = true;
c1TreeView1.EnableDragDrop = true;
c1TreeView2.EnableDragDrop = true;
c1TreeView1.ItemDrag += C1TreeView_ItemDrag;
c1TreeView2.ItemDrag += C1TreeView_ItemDrag;
c1TreeView1.DragEnter += C1TreeView_DragEnter;
c1TreeView2.DragEnter += C1TreeView_DragEnter;
c1TreeView1.DragDrop += C1TreeView_DragDrop;
c1TreeView2.DragDrop += C1TreeView_DragDrop;
}
private C1TreeNode oldTN;
private void C1TreeView_DragDrop(object sender, DragEventArgs e)
{
//第三步
var treeView = (C1TreeView)sender;
// get dropped data
var distanceNodes = (C1TreeNode[])e.Data.GetData(typeof(C1TreeNode[]));
var distanceNode = distanceNodes[0];
var pos = (DragDropPosition)e.Data.GetData(typeof(DragDropPosition));
if (pos == DragDropPosition.Inner)
{
distanceNode.ParentCollection.Remove(distanceNode);
treeView.Nodes.Add(oldTN);
MessageBox.Show("no");
return;
}
}
private void C1TreeView_DragEnter(object sender, DragEventArgs e)
{
//第二步
e.Effect = DragDropEffects.Move;
//获取拖动之前的节点
var distanceNodes = (C1TreeNode[])e.Data.GetData(typeof(C1TreeNode[]));
oldTN = distanceNodes[0];
}
private void C1TreeView_ItemDrag(object sender, C1.Win.TreeView.C1TreeViewItemDragEventArgs e)
{
//第一步
DoDragDrop(e.DraggedData, DragDropEffects.Move);
}
private void Form1_Load(object sender, EventArgs e)
{
for (int i = 0; i < 5; i++)
{
c1TreeView1.Nodes.Add("Node" + i);
c1TreeView2.Nodes.Add("Node" + i * 100);
for (int j = 0; j < 5; j++)
{
c1TreeView1.Nodes[i].Nodes.Add("Node" + (i * 10 + j));
c1TreeView2.Nodes[i].Nodes.Add("Node" + (i * 100 + j));
}
}
}
}
}

复制代码

如上面的代码，借用treeview的DragAndDrop的示例；如果是这样inner拖动的，就需要把移动过去的删掉，然后再在tree后面新增一个新的，通过这种方式来禁止往子节点的拖动，有没有简单的方法呢？

JeffryLI · JeffryLI

没有，您的这个方式就是我之前的给您的思路

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[已处理] treeview如何设置，禁止节点往子节点处拖动？

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元老葡萄