鼠标拖动效果

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using System;02.using System.Collections.Generic;03.using System.ComponentModel;04.using System.Data;05.using System.Drawing;06.using System.Text;07.using System.Windows.Forms;08.09.namespace WindowsApplication110.{11.    public partial class FormDrag : Form12.    {13.        //将被拖动的控件 14.        private Control control;15.        public FormDrag()16.        {17.            InitializeComponent();18.19.            this.Paint += new System.Windows.Forms.PaintEventHandler(this.FormDrag_Paint);20.21.            control = new Button();22.            control.MouseDown += new MouseEventHandler(control_MouseDown);23.            control.MouseMove += new MouseEventHandler(control_MouseMove);24.            control.MouseUp += new MouseEventHandler(control_MouseUp);25.            this.Controls.Add(control);            26.        }27.       28.        //鼠标按下坐标（control控件的相对坐标） 29.        Point mouseDownPoint = Point.Empty;30.        //显示拖动效果的矩形 31.        Rectangle rect = Rectangle.Empty;32.        //是否正在拖拽 33.        bool isDrag = false;34.        void control_MouseDown(object sender, MouseEventArgs e)35.        {36.            if (e.Button == MouseButtons.Left)37.            {38.                mouseDownPoint = e.Location;39.                //记录控件的大小 40.                rect = control.Bounds;41.            }42.        }43.        void control_MouseMove(object sender, MouseEventArgs e)44.        {45.            if (e.Button == MouseButtons.Left)46.            {47.                isDrag = true;48.                //重新设置rect的位置，跟随鼠标移动 49.                rect.Location = getPointToForm(new Point(e.Location.X - mouseDownPoint.X, e.Location.Y - mouseDownPoint.Y));50.                this.Refresh();51.                52.            }53.        }54.        void control_MouseUp(object sender, MouseEventArgs e)55.        {56.            if (e.Button == MouseButtons.Left)57.            {58.                if (isDrag)59.                {60.                    isDrag = false;61.                    //移动control到放开鼠标的地方 62.                    control.Location = rect.Location;63.                    this.Refresh();64.                }65.                reset();66.67.            }68.        }69.        //重置变量 70.        private void reset()71.        {72.            mouseDownPoint = Point.Empty;73.            rect = Rectangle.Empty;74.            isDrag = false;75.        }76.        //窗体重绘 77.        private void FormDrag_Paint(object sender, PaintEventArgs e)78.        {79.            if (rect != Rectangle.Empty)80.            {81.                if (isDrag)82.                {//画一个和Control一样大小的黑框 83.                    e.Graphics.DrawRectangle(Pens.Black, rect);84.                }85.                else86.                {87.                    e.Graphics.DrawRectangle(new Pen(this.BackColor), rect);88.                }89.            }90.        }91.        //把相对与control控件的坐标，转换成相对于窗体的坐标。 92.        private Point getPointToForm(Point p)93.        {94.            return this.PointToClient(control.PointToScreen(p));95.        }96.        97.    }98.}
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