form1.cs

Csharp实例编程百例.rar

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace DragDropApp
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.TreeView treeView1;
		private System.Windows.Forms.ImageList imageList1;
		private System.ComponentModel.IContainer components;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
			this.treeView1 = new System.Windows.Forms.TreeView();
			this.imageList1 = new System.Windows.Forms.ImageList(this.components);
			this.SuspendLayout();
			// 
			// treeView1
			// 
			this.treeView1.AllowDrop = true;
			this.treeView1.Dock = System.Windows.Forms.DockStyle.Fill;
			this.treeView1.ImageList = this.imageList1;
			this.treeView1.Name = "treeView1";
			this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
																				  new System.Windows.Forms.TreeNode("节点0", new System.Windows.Forms.TreeNode[] {
																																								   new System.Windows.Forms.TreeNode("节点1", new System.Windows.Forms.TreeNode[] {
																																																													new System.Windows.Forms.TreeNode("节点4"),
																																																													new System.Windows.Forms.TreeNode("节点5")}),
																																								   new System.Windows.Forms.TreeNode("节点2", new System.Windows.Forms.TreeNode[] {
																																																													new System.Windows.Forms.TreeNode("节点6"),
																																																													new System.Windows.Forms.TreeNode("节点7")}),
																																								   new System.Windows.Forms.TreeNode("节点3", new System.Windows.Forms.TreeNode[] {
																																																													new System.Windows.Forms.TreeNode("节点8"),
																																																													new System.Windows.Forms.TreeNode("节点9")}),
																																								   new System.Windows.Forms.TreeNode("节点10")})});
			this.treeView1.SelectedImageIndex = 1;
			this.treeView1.Size = new System.Drawing.Size(292, 273);
			this.treeView1.TabIndex = 0;
			this.treeView1.DragOver += new System.Windows.Forms.DragEventHandler(this.treeView1_DragOver);
			this.treeView1.DragEnter += new System.Windows.Forms.DragEventHandler(this.treeView1_DragEnter);
			this.treeView1.ItemDrag += new System.Windows.Forms.ItemDragEventHandler(this.treeView1_ItemDrag);
			this.treeView1.DragDrop += new System.Windows.Forms.DragEventHandler(this.treeView1_DragDrop);
			// 
			// imageList1
			// 
			this.imageList1.ColorDepth = System.Windows.Forms.ColorDepth.Depth8Bit;
			this.imageList1.ImageSize = new System.Drawing.Size(16, 16);
			this.imageList1.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("imageList1.ImageStream")));
			this.imageList1.TransparentColor = System.Drawing.Color.Transparent;
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(292, 273);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.treeView1});
			this.Name = "Form1";
			this.Text = "DragDropApp";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void treeView1_ItemDrag(object sender, System.Windows.Forms.ItemDragEventArgs e)
		{
			//启动拖放操作，设置拖放类型为Move(移动)
			DoDragDrop(e.Item ,DragDropEffects.Move );
		}

		private TreeNode oldenterNode;	//保存前一个鼠标进入的TreeNode
		
		private void treeView1_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)
		{
			//获取TreeNode类型的数据内容
			object data = e.Data.GetData (typeof(TreeNode));
			//如果有数据，拖放目标允许移动
			if (data!=null)
			{
				e.Effect = DragDropEffects.Move ;

			}else e.Effect = DragDropEffects.None;
			//获得当前TreeView的引用
			TreeView theTree = (TreeView)sender;
			//得到鼠标进入的TreeNode的引用
			TreeNode enterNode = theTree.GetNodeAt (treeView1.PointToClient (new Point(e.X ,e.Y)));
			if (enterNode!=null)
			{	//改变进入TreeNode的背景色
				enterNode.BackColor = Color.Blue ;
				//保存此TreeNode，进入下一个时还原背景色
				oldenterNode = enterNode;
			}
		}

		private void treeView1_DragOver(object sender, System.Windows.Forms.DragEventArgs e)
		{	//修改鼠标进入TreeNode的背景色，还原上一个TreeNode的背景色
			TreeView theTree = (TreeView)sender;
			TreeNode enterNode = theTree.GetNodeAt (treeView1.PointToClient (new Point(e.X ,e.Y)));
			if ((enterNode != null)&&(enterNode!=oldenterNode)){
				oldenterNode.BackColor = Color.White ;
				enterNode.BackColor = Color.Blue ;
				oldenterNode = enterNode;
			}
		}

		private void treeView1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
		{	//得到拖放数据，并转换为TreeNode型
			TreeNode theNode = (TreeNode)e.Data .GetData (typeof(TreeNode));
			TreeView theTree = (TreeView)sender;
			//得到当前鼠标进入的TreeNode，即拖放目标TreeNode
			TreeNode targetNode = theTree.GetNodeAt (treeView1.PointToClient (new Point(e.X ,e.Y)));
			if (targetNode!= null)
			{
				TreeNode targetParent = targetNode.Parent ;
				//删除拖放的TreeNode
				theNode.Remove ();
				//添加到目标TreeNode下
				targetNode.Nodes .Add (theNode);
				targetNode.BackColor = Color.White ;
				theTree.SelectedNode = targetNode;
				
			}
		}
	}
}