同系列文章：
功能说明
- WinForm窗体控件，非WPF控件
- 把图片文件拖入框内即可显示
- 把图片拖出框即可删除
开发工具
- Visual Studio v2010
- .NET Framework 4 Client Profile
演示程序界面
源代码下载
源代码
FingerPictureBox.cs
/* ----------------------------------------------------------
文件名称：FingerPictureBox.cs
作者：秦建辉
微信：splashcn
博客：http://www.firstsolver.com/wordpress/
开发环境：
Visual Studio V2010
.NET Framework 4 Client Profile
版本历史：
V1.0 2011年07月12日
基于WinForm，实现一个具有拖入和删除功能的图片框控件
------------------------------------------------------------ */
using System;
using System.Drawing;
using System.Windows.Forms;
namespace Splash
{
/// <summary>
/// 方便手指操作的用户控件，轻松完成图像拖入和删除
/// 主要属性：
/// ImageLayout：设置图像布局（None、Tile、Center、Stretch、Zoom）
/// ImageSize：控件大小
/// InitialImage：初始图像
/// ActiveImage：活动图像
/// </summary>
public partial class FingerPictureBox : UserControl
{
private Int32 mouseX;
private Int32 mouseY;
private Image _InitialImage = null;
public FingerPictureBox()
{
InitializeComponent();
// 设置用户控件属性，允许用户在上面拖放数据
this.AllowDrop = true;
// 设置装载事件处理器
this.Load += new EventHandler(this.FingerPictureBox_Load);
// 设置拖动事件处理器
this.DragDrop += new DragEventHandler(this.FingerPictureBox_DragDrop);
this.DragEnter += new DragEventHandler(this.FingerPictureBox_DragEnter);
}
private void FingerPictureBox_Load(object sender, EventArgs e)
{
// 设置图片框停靠位置和方式
this.Controls[0].Dock = DockStyle.None;
// 设定图片框背景图像布局
this.Controls[0].BackgroundImageLayout = ImageLayout.Stretch;
// 设置图片框的起始位置和大小
this.Controls[0].Location = new Point(0, 0);
this.Controls[0].Size = this.Size;
// 设置背景图像改变事件处理器
this.Controls[0].BackgroundImageChanged += new EventHandler(this.FingerPictureBox_BackgroundImageChanged);
}
private void FingerPictureBox_DragDrop(object sender, DragEventArgs e)
{ // 获取拖入的文件
String[] DropFiles = (String[])(e.Data.GetData(DataFormats.FileDrop));
if (DropFiles != null)
{ // 设置控件背景图像
this.Controls[0].BackgroundImage = Image.FromFile(DropFiles[0]);
}
}
private void FingerPictureBox_DragEnter(object sender, DragEventArgs e)
{ // 拖放时显示的效果
e.Effect = DragDropEffects.Link;
}
private void FingerPictureBox_MouseDown(object sender, MouseEventArgs e)
{ // 记录鼠标单击时的初始位置
mouseX = Cursor.Position.X;
mouseY = Cursor.Position.Y;
}
private void FingerPictureBox_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
((PictureBox)sender).Left = Cursor.Position.X - mouseX;
((PictureBox)sender).Top = Cursor.Position.Y - mouseY;
}
}
private void FingerPictureBox_MouseUp(object sender, MouseEventArgs e)
{ // 判断图像是否移出边界
if (((PictureBox)sender).Left > this.Width || ((PictureBox)sender).Right < 0 ||
((PictureBox)sender).Top > this.Height || ((PictureBox)sender).Bottom < 0)
{ // 图像已经移出边界，恢复初始图像
((PictureBox)sender).BackgroundImage = _InitialImage;
}
// 图片框复位
this.Controls[0].Location = new Point(0, 0);
}
private void FingerPictureBox_BackgroundImageChanged(object sender, EventArgs e)
{
if (this.Controls[0].BackgroundImage == _InitialImage)
{ // 禁止图像拖动删除功能
((PictureBox)sender).MouseDown -= FingerPictureBox_MouseDown;
((PictureBox)sender).MouseMove -= FingerPictureBox_MouseMove;
((PictureBox)sender).MouseUp -= FingerPictureBox_MouseUp;
}
else
{ // 恢复图像拖动删除功能
((PictureBox)sender).MouseDown += FingerPictureBox_MouseDown;
((PictureBox)sender).MouseMove += FingerPictureBox_MouseMove;
((PictureBox)sender).MouseUp += FingerPictureBox_MouseUp;
}
}
/// <summary>
/// 控件上图像的布局
/// </summary>
public ImageLayout ImageLayout
{
get
{
return this.Controls[0].BackgroundImageLayout;
}
set
{
this.Controls[0].BackgroundImageLayout = value;
}
}
/// <summary>
/// 控件大小
/// </summary>
public Size ImageSize
{
get
{
return this.Size;
}
set
{
this.Controls[0].Size = this.Size = value;
}
}
/// <summary>
/// 初始图像
/// </summary>
public Image InitialImage
{
get
{
return _InitialImage;
}
set
{
this.Controls[0].BackgroundImage = _InitialImage = value;
}
}
/// <summary>
/// 活动图像
/// </summary>
public Image ActiveImage
{
get
{
return this.Controls[0].BackgroundImage;
}
set
{
this.Controls[0].BackgroundImage = value;
}
}
}
}
FingerPictureBox.Designer.cs
namespace Splash
{
partial class FingerPictureBox
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region 组件设计器生成的代码
/// <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.pictureBox1 = new System.Windows.Forms.PictureBox();
((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
this.SuspendLayout();
//
// pictureBox1
//
this.pictureBox1.Location = new System.Drawing.Point(0, 0);
this.pictureBox1.Name = "pictureBox1";
this.pictureBox1.Size = new System.Drawing.Size(127, 144);
this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
this.pictureBox1.TabIndex = 0;
this.pictureBox1.TabStop = false;
//
// FingerPictureBox
//
this.AllowDrop = true;
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.Controls.Add(this.pictureBox1);
this.Name = "FingerPictureBox";
this.Size = new System.Drawing.Size(173, 196);
((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.PictureBox pictureBox1;
}
}