学步园

1.先建一类ControlMoveResize.cs

using System;<br /> using System.Collections.Generic;<br /> using System.Text;<br /> using System.Drawing;<br /> using System.Windows.Forms;</p> <p>namespace yaohao<br /> {<br /> class ControlMoveResize<br /> {<br /> bool IsMoving = false;</p> <p> Point pCtrlLastCoordinate = new Point(0, 0);<br /> Point pCursorOffset = new Point(0, 0);<br /> Point pCursorLastCoordinate = new Point(0, 0);<br /> private Control ctrl = null;<br /> private ScrollableControl Containe = null;</p> <p> private void MouseDown(object sender, MouseEventArgs e)<br /> {<br /> if (Containe == null)<br /> {</p> <p> return;</p> <p> }</p> <p> if (e.Button == MouseButtons.Left)<br /> {</p> <p> IsMoving = true;</p> <p> pCtrlLastCoordinate.X = ctrl.Left;<br /> pCtrlLastCoordinate.Y = ctrl.Top;<br /> pCursorLastCoordinate.X = Cursor.Position.X;<br /> pCursorLastCoordinate.Y = Cursor.Position.Y;<br /> }<br /> }</p> <p> private void MouseMove(object sender, MouseEventArgs e)<br /> {<br /> if (Containe == null)<br /> {<br /> return;<br /> }</p> <p> if (e.Button == MouseButtons.Left)<br /> {<br /> if (this.IsMoving)<br /> {<br /> Point pCursor = new Point(Cursor.Position.X, Cursor.Position.Y);<br /> pCursorOffset.X = pCursor.X - pCursorLastCoordinate.X;<br /> pCursorOffset.Y = pCursor.Y - pCursorLastCoordinate.Y;<br /> ctrl.Left = pCtrlLastCoordinate.X + pCursorOffset.X;<br /> ctrl.Top = pCtrlLastCoordinate.Y + pCursorOffset.Y;<br /> }<br /> }<br /> }</p> <p> private void MouseUp(object sender, MouseEventArgs e)<br /> {<br /> if (Containe == null)<br /> {<br /> return;<br /> }</p> <p> if (this.IsMoving)<br /> {<br /> if (pCursorOffset.X == 0 && pCursorOffset.Y == 0)<br /> {<br /> return;<br /> }</p> <p> if ((pCtrlLastCoordinate.X + pCursorOffset.X + ctrl.Width) > 0)<br /> {<br /> ctrl.Left = pCtrlLastCoordinate.X + pCursorOffset.X;<br /> }</p> <p> else<br /> {<br /> ctrl.Left = 0;<br /> }</p> <p> if ((pCtrlLastCoordinate.Y + pCursorOffset.Y + ctrl.Height) > 0)<br /> {<br /> ctrl.Top = pCtrlLastCoordinate.Y + pCursorOffset.Y;<br /> }</p> <p> else<br /> {<br /> ctrl.Top = 0;<br /> }<br /> pCursorOffset.X = 0;<br /> pCursorOffset.Y = 0;<br /> }<br /> }</p> <p> public ControlMoveResize(Control c, ScrollableControl parentContain)<br /> {<br /> ctrl = c;<br /> this.Containe = parentContain;<br /> ctrl.MouseDown += new MouseEventHandler(MouseDown);<br /> ctrl.MouseMove += new MouseEventHandler(MouseMove);<br /> ctrl.MouseUp += new MouseEventHandler(MouseUp);<br /> }<br /> }<br /> }<br />

2.使用方法

private void Form1_Load(object sender, EventArgs e)<br /> {<br /> ControlMoveResize con = new ControlMoveResize(button1, this);</p> <p> }<br />