c# winform 用鼠标画拉出来的虚线框,鼠标框选边框效果

using System;  
using System.Collections.Generic;  
using System.ComponentModel;  
using System.Data;  
using System.Drawing;  
using System.Text;  
using System.Windows.Forms;  
 
namespace AllTest  
{  
    public partial class Form11 : Form  
    {  
        bool MouseIsDown = false;  
        Rectangle MouseRect = Rectangle.Empty;   
        public Form11()  
        {  
            InitializeComponent();  
            this.MouseDown += new MouseEventHandler(frmMain_MouseDown);  
            this.MouseMove += new MouseEventHandler(frmMain_MouseMove);  
            this.MouseUp += new MouseEventHandler(frmMain_MouseUp);   
        }  
        void frmMain_MouseUp(object sender, MouseEventArgs e)  
        {  
            this.Capture = false;  
            Cursor.Clip = Rectangle.Empty;  
            MouseIsDown = false;  
            DrawRectangle();  
            MouseRect = Rectangle.Empty;  
        }  
        void frmMain_MouseMove(object sender, MouseEventArgs e)  
        {  
            if (MouseIsDown)  
                ResizeToRectangle(e.Location);  
        }  
        void frmMain_MouseDown(object sender, MouseEventArgs e)  
        {  
            MouseIsDown = true;  
            DrawStart(e.Location);  
       }  
        private void ResizeToRectangle(Point p)  
        {  
            DrawRectangle();  
            MouseRect.Width = p.X - MouseRect.Left;  
            MouseRect.Height = p.Y - MouseRect.Top;  
            DrawRectangle();  
        }  
        private void DrawRectangle()  
        {  
           Rectangle rect = this.RectangleToScreen(MouseRect);  
            ControlPaint.DrawReversibleFrame(rect, Color.White, FrameStyle.Dashed);  
        }  
        private void DrawStart(Point StartPoint)  
        {  
            this.Capture = true;  
            Cursor.Clip = this.RectangleToScreen(new Rectangle(0, 0, ClientSize.Width, ClientSize.Height));  
            MouseRect = new Rectangle(StartPoint.X, StartPoint.Y, 0, 0);  
        }   
    }  
} 

 

 

在鼠标按下事件里写（一定是鼠标按下事件MouseDown 因为我的参数e是鼠标数据对象
（不过你也可以传坐标））
MouseIsDown = true;
DrawStart(e.Location);

在鼠标移动（MouseMove）事件里写
if (MouseIsDown)
  ResizeToRectangle(e.Location);


在鼠标释放（MouseUp）事件里写
this.Capture = false;
Cursor.Clip = Rectangle.Empty;
MouseIsDown = false;
DrawRectangle();
MouseRect = Rectangle.Empty;

这样不会覆盖原来的控件,不会重绘控件

如果是加Panel的话

把DrawStart()方法里的Cursor.Clip = this.RectangleToScreen(this.Bounds);
改为Cursor.Clip = this.RectangleToScreen(this.panel1.ClientRectangle));
this.Capture = true;改为 this.panel1.Capture = true;
MouseUp里的 this.Capture = false;改为
this.panel1.Capture = false;

这是设置鼠标筐选时鼠标的移动区域 和控件对鼠标的捕获
Cursor.Clip = this.RectangleToScreen(this.Bounds);
这是设置鼠标筐选时鼠标的移动区域 根据你的需要自己去设置

 

转帖地址: http://heisetoufa.javaeye.com/blog/380977