c# capture = true

来源：互联网发布：淘宝店运动壹号怎么样编辑：程序博客网时间：2024/06/01 18:07

这东西邪门的很~ 开了之后无法相应 MouseDown 和 MouseUp了

msdn: 当控件已捕获鼠标时，它接收鼠标输入，不论光标是否在其边框内。通常只有在执行拖动操作时才捕获鼠标。

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Drawing.Drawing2D;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace WindowsFormsApplication1{    public partial class Form1 : Form    {        private Point DownPoint = Point.Empty;        private Pen MyPen;        private Rectangle srcRect;        private bool f = false;        public Form1()        {            InitializeComponent();        }          private void pictureBox1_Paint(object sender, PaintEventArgs e)        {            if (srcRect != Rectangle.Empty)            {                MyPen = new Pen(Color.Black, 1);                e.Graphics.DrawRectangle(MyPen, srcRect);            }        }        private void pictureBox2_Paint(object sender, PaintEventArgs e)        {                        if (srcRect != Rectangle.Empty)            {                e.Graphics.DrawImage(this.pictureBox1.Image, new Rectangle(0, 0, srcRect.Width, srcRect.Height), srcRect, GraphicsUnit.Pixel);            }          }                private void pictureBox1_MouseMove(object sender, MouseEventArgs e)        {            if (f)            {                int w = Math.Abs(e.X - DownPoint.X);                int h = Math.Abs(e.Y - DownPoint.Y);                if (e.X > DownPoint.X)                    srcRect = new Rectangle(DownPoint.X, DownPoint.Y, w, h);                else                    srcRect = new Rectangle(e.X, e.Y, w, h);                                this.pictureBox1.Invalidate();                this.pictureBox1.Update();                this.pictureBox2.Invalidate();                this.pictureBox2.Update();            }                   }        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)        {            if (e.Button == MouseButtons.Left)            {                this.Capture = true;   //注释掉后一切正常                if (DownPoint == Point.Empty)                {                    f = true;                    DownPoint.X = e.X;                    DownPoint.Y = e.Y;                                     }              }        }        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)        {            if (DownPoint != Point.Empty)            {                DownPoint = Point.Empty;                srcRect = Rectangle.Empty;                                this.pictureBox1.Invalidate();                this.pictureBox1.Update();                             }            MessageBox.Show("up");            f = false;        }            }}

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