Control Study -> 实现:用鼠标拖动图片

(一).说明

功能:用鼠标实现拖动图片.
用法:将鼠标指向一图片,按住鼠标左键拖动. 图片会随鼠标一起移动.

(二).代码

(说明: 此功能我用的用途是将象棋游戏之棋子拖动效果)

读者可以将此功能用作其它用途,也可以用作设计其它的游戏.

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

namespace 拖动图片
{
///

1<summary>   
2/// Form1 的摘要说明。   
3/// </summary>

public class Form1 : System.Windows.Forms.Form
{
public System.Windows.Forms.PictureBox[] pictureBox=new PictureBox[2];
//private System.Windows.Forms.PictureBox pictureBox2;
///

1<summary>   
2/// 必需的设计器变量。   
3/// </summary>

private System.ComponentModel.Container components = null;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
for(int i=0;i<2;i++)
{
this.pictureBox[i].MouseUp += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseUp);
this.pictureBox[i].MouseMove += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseMove);
this.pictureBox[i].MouseDown += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseDown);
}

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

///

1<summary>   
2/// 清理所有正在使用的资源。   
3/// </summary>

protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
///

1<summary>   
2/// 设计器支持所需的方法 - 不要使用代码编辑器修改   
3/// 此方法的内容。   
4/// </summary>

private void InitializeComponent()
{
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
this.SuspendLayout();
this.pictureBox[0] = new System.Windows.Forms.PictureBox();
this.pictureBox[1] = new System.Windows.Forms.PictureBox();

//
// pictureBox1
//
this.pictureBox[0].BackColor = System.Drawing.Color.Transparent;
this.pictureBox[0].Image = ((System.Drawing.Image)(resources.GetObject("pictureBox1.Image")));
this.pictureBox[0].Location = new System.Drawing.Point(200, 192);
this.pictureBox[0].Name = "pictureBox1";
this.pictureBox[0].Size = new System.Drawing.Size(88, 72);
this.pictureBox[0].SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
this.pictureBox[0].TabIndex = 0;
this.pictureBox[0].TabStop = false;
/this.pictureBox[1].MouseUp += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseUp);
this.pictureBox[1].MouseMove += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseMove);
this.pictureBox[1].MouseDown += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseDown);/
//
// pictureBox2
//
//this.Opacity=0.8;
this.pictureBox[1].BackColor = System.Drawing.Color.DodgerBlue;
this.pictureBox[1].Image = ((System.Drawing.Image)(resources.GetObject("pictureBox2.Image")));
this.pictureBox[1].Location = new System.Drawing.Point(200, 72);
this.pictureBox[1].Name = "pictureBox2";
this.pictureBox[1].Size = new System.Drawing.Size(88, 64);
this.pictureBox[1].SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
this.pictureBox[1].TabIndex = 1;
this.pictureBox[1].TabStop = false;
/*this.pictureBox[2].MouseUp += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseUp);
this.pictureBox[2].MouseMove += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseMove);
this.pictureBox[2].MouseDown += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseDown);
*/

//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(432, 348);
this.Controls.Add(this.pictureBox[0]);
this.Controls.Add(this.pictureBox[1]);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);

}
#endregion

///

1<summary>   
2/// 应用程序的主入口点。   
3/// </summary>

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

bool whetherSelected=false;
Point p=new Point();

#region 事件代码
private void pictureBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
whetherSelected=true;
p.X=Cursor.Position.X;
p.Y=Cursor.Position.Y;
}

private void pictureBox1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
whetherSelected=false;
}

private void pictureBox1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
if(whetherSelected==true)
{
//加入一个函数,得到是哪个pictureBox
int index=-1;
for(int i=0;i<2;i++)
if(this.pictureBox[i].Capture)
index=i;
this.pictureBox[index].Left=this.pictureBox[index].Left+(Cursor.Position.X-p.X);
this.pictureBox[index].Top=this.pictureBox[index].Top+(Cursor.Position.Y-p.Y);

this.pictureBox[1-index].SendToBack();

p.X=Cursor.Position.X;
p.Y=Cursor.Position.Y;
}
}

#endregion

}
}

谢谢阅读!