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问答

Treeview如何实现拖拽功能

wfox111 2004-11-04 03:40:00

我想在两棵树之间进行拖拽,请问该如何实现
跟者有分

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wfox111 2004-11-16

多谢各位

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xq02 2004-11-04

收到没有?

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wfox111 2004-11-04

wfox111@163.com
wfox111@sina.com
再次感谢

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xq02 2004-11-04

给个信箱,我给你发个例子

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wfox111 2004-11-04

不知道在页面中时候合适

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wq_sc 2004-11-04

学习！

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wfox111 2004-11-04

先谢了,好好看看

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server_me 2004-11-04

跟，~~

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trnbo 2004-11-04

using System;
using System.Drawing;
using System.Windows.Forms;

public class Form1 : Form
{
private TreeView treeView1;

public Form1()
{
treeView1 = new TreeView();

this.SuspendLayout();

// Initialize treeView1.
treeView1.AllowDrop = true;
treeView1.Dock = DockStyle.Fill;

// Add nodes to treeView1.
TreeNode node;
for (int x = 0; x < 3; ++x)
{
// Add a root node to treeView1.
node = treeView1.Nodes.Add(String.Format("Node{0}", x*4));
for (int y = 1; y < 4; ++y)
{
// Add a child node to the previously added node.
node = node.Nodes.Add(String.Format("Node{0}", x*4 + y));
}
}

// Add event handlers for the required drag events.
treeView1.ItemDrag += new ItemDragEventHandler(treeView1_ItemDrag);
treeView1.DragEnter += new DragEventHandler(treeView1_DragEnter);
treeView1.DragOver += new DragEventHandler(treeView1_DragOver);
treeView1.DragDrop += new DragEventHandler(treeView1_DragDrop);

// Initialize the form.
this.ClientSize = new Size(292, 273);
this.Controls.Add(treeView1);

this.ResumeLayout(false);
}

[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void treeView1_ItemDrag(object sender, ItemDragEventArgs e)
{
// Move the dragged node when the left mouse button is used.
if (e.Button == MouseButtons.Left)
{
DoDragDrop(e.Item, DragDropEffects.Move);
}

// Copy the dragged node when the right mouse button is used.
else if (e.Button == MouseButtons.Right)
{
DoDragDrop(e.Item, DragDropEffects.Copy);
}
}

// Set the target drop effect to the effect
// specified in the ItemDrag event handler.
private void treeView1_DragEnter(object sender, DragEventArgs e)
{
e.Effect = e.AllowedEffect;
}

// Select the node under the mouse pointer to indicate the
// expected drop location.
private void treeView1_DragOver(object sender, DragEventArgs e)
{
// Retrieve the client coordinates of the mouse position.
Point targetPoint = treeView1.PointToClient(new Point(e.X, e.Y));

// Select the node at the mouse position.
treeView1.SelectedNode = treeView1.GetNodeAt(targetPoint);
}

private void treeView1_DragDrop(object sender, DragEventArgs e)
{
// Retrieve the client coordinates of the drop location.
Point targetPoint = treeView1.PointToClient(new Point(e.X, e.Y));

// Retrieve the node at the drop location.
TreeNode targetNode = treeView1.GetNodeAt(targetPoint);

// Retrieve the node that was dragged.
TreeNode draggedNode = (TreeNode)e.Data.GetData(typeof(TreeNode));

// Confirm that the node at the drop location is not
// the dragged node or a descendant of the dragged node.
if (!draggedNode.Equals(targetNode) && !ContainsNode(draggedNode, targetNode))
{
// If it is a move operation, remove the node from its current
// location and add it to the node at the drop location.
if (e.Effect == DragDropEffects.Move)
{
draggedNode.Remove();
targetNode.Nodes.Add(draggedNode);
}

// If it is a copy operation, clone the dragged node
// and add it to the node at the drop location.
else if (e.Effect == DragDropEffects.Copy)
{
targetNode.Nodes.Add((TreeNode)draggedNode.Clone());
}

// Expand the node at the location
// to show the dropped node.
targetNode.Expand();
}
}

// Determine whether one node is a parent
// or ancestor of a second node.
private bool ContainsNode(TreeNode node1, TreeNode node2)
{
// Check the parent node of the second node.
if (node2.Parent == null) return false;
if (node2.Parent.Equals(node1)) return true;

// If the parent node is not null or equal to the first node,
// call the ContainsNode method recursively using the parent of
// the second node.
return ContainsNode(node1, node2.Parent);
}

}

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