C# WinForm实现窗体上控件自由拖动功能示例实现窗体上控件自由拖动功能示例
主要介绍了C# WinForm实现窗体上控件自由拖动功能,涉及WinForm控件属性及事件响应相关操作技巧,需要的
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本文实例讲述了C# WinForm实现窗体上控件自由拖动功能。分享给大家供大家参考,具体如下:
说明:首先在窗体上放一个PictrueBox控件,命名为pb1,拖动完整代码如下:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WinFormDrag
{
public partial class Form1 : Form
{
//鼠标按下坐标(control控件的相对坐标)
Point mouseDownPoint = Point.Empty;
//显示拖动效果的矩形
Rectangle rect = Rectangle.Empty;
//是否正在拖拽
bool isDrag = false;
public Form1()
{
InitializeComponent();
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
if (rect != Rectangle.Empty)
{
if (isDrag)
{//画一个和Control一样大小的黑框
e.Graphics.DrawRectangle(Pens.Black, rect);
}
else
{
e.Graphics.DrawRectangle(new Pen(this.BackColor), rect);
}
}
}
/// <summary>
/// 按下鼠标时
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void pb1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
mouseDownPoint = e.Location;
//记录控件的大小
rect = pb1.Bounds;
}
}
/// <summary>
/// 移过时
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void pb1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
isDrag = true;
//重新设置rect的位置,跟随鼠标移动
rect.Location = getPointToForm(new Point(e.Location.X - mouseDownPoint.X, e.Location.Y - mouseDownPoint.Y));
this.Refresh();
}
}
/// <summary>
/// 释放鼠标按钮时
/// </summary>
/// <param name="sender"></param>