（转）C#如何在运行时通过鼠标拖动改变控件的大小

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Windows.Forms;
using System.Drawing;

namespace WindowsApplication2
{

class ResizeAction
{
bool IsMoving = false;
int ctrlLastWidth = 0;
int ctrlLastHeight = 0;
int ctrlWidth;
int ctrlHeight;
int ctrlLeft;
int ctrlTop;
int cursorL;
int cursorT;
int ctrlLastLeft;
int ctrlLastTop;
int Htap;
int Wtap;
bool ctrlIsResizing = false;
System.Drawing.Rectangle ctrlRectangle = new System.Drawing.Rectangle();
private Control ctrl;
private Form frm;
public ResizeAction(Control c, Form frm)
{
ctrl = c;
this.frm = frm;
this.Htap = this.frm.Height - this.frm.ClientRectangle.Height;
this.Wtap = this.frm.Width - this.frm.ClientRectangle.Width;
ctrl.MouseDown += new MouseEventHandler(MouseDown);
ctrl.MouseMove += new MouseEventHandler(MouseMove);
ctrl.MouseUp += new MouseEventHandler(MouseUp);
}
public void MouseMove(object sender, MouseEventArgs e)
{
if (frm == null)
return;
if (e.Button == MouseButtons.Left)
{
if (this.IsMoving)
{
if (ctrlLastLeft == 0)
ctrlLastLeft = ctrlLeft;
if (ctrlLastTop == 0)
ctrlLastTop = ctrlTop;
int locationX = (Cursor.Position.X - this.cursorL + this.frm.DesktopLocation.X + this.Wtap + this.ctrl.Location.X);
int locationY = (Cursor.Position.Y - this.cursorT + this.frm.DesktopLocation.Y + this.Htap + this.ctrl.Location.Y);
if (locationX < this.frm.DesktopLocation.X + this.Wtap)
locationX = this.frm.DesktopLocation.X + this.Wtap;
if (locationY < this.frm.DesktopLocation.Y + this.Htap)
locationY = this.frm.DesktopLocation.Y + this.Htap;
this.ctrlLeft = locationX;
this.ctrlTop = locationY;
ctrlRectangle.Location = new System.Drawing.Point(this.ctrlLastLeft, this.ctrlLastTop);
ctrlRectangle.Size = new System.Drawing.Size(ctrlWidth, ctrlHeight);
ControlPaint.DrawReversibleFrame(ctrlRectangle, Color.Empty, System.Windows.Forms.FrameStyle.Dashed);
ctrlLastLeft = ctrlLeft;
ctrlLastTop = ctrlTop;
ctrlRectangle.Location = new System.Drawing.Point(ctrlLeft, ctrlTop);
ctrlRectangle.Size = new System.Drawing.Size(ctrlWidth, ctrlHeight);
ControlPaint.DrawReversibleFrame(ctrlRectangle, Color.Empty, System.Windows.Forms.FrameStyle.Dashed);
return;
}
int sizeageX = (Cursor.Position.X - this.frm.DesktopLocation.X - this.Wtap - this.ctrl.Location.X);
int sizeageY = (Cursor.Position.Y - this.frm.DesktopLocation.Y - this.Htap - this.ctrl.Location.Y);
if (sizeageX < 2)
sizeageX = 1;
if (sizeageY < 2)
sizeageY = 1;
ctrlWidth = sizeageX;
ctrlHeight = sizeageY;
if (ctrlLastWidth == 0)
ctrlLastWidth = ctrlWidth;
if (ctrlLastHeight == 0)
ctrlLastHeight = ctrlHeight;
if (ctrlIsResizing)
{
ctrlRectangle.Location = new System.Drawing.Point(this.frm.DesktopLocation.X + this.ctrl.Left + this.Wtap, this.frm.DesktopLocation.Y + this.Htap + this.ctrl.Top);
ctrlRectangle.Size = new System.Drawing.Size(ctrlLastWidth, ctrlLastHeight);
}
ctrlIsResizing = true;
ControlPaint.DrawReversibleFrame(ctrlRectangle, Color.Empty, System.Windows.Forms.FrameStyle.Dashed);
ctrlLastWidth = ctrlWidth;
ctrlLastHeight = ctrlHeight;
ctrlRectangle.Location = new System.Drawing.Point(this.frm.DesktopLocation.X + this.Wtap + this.ctrl.Left, this.frm.DesktopLocation.Y + this.Htap + this.ctrl.Top);
ctrlRectangle.Size = new System.Drawing.Size(ctrlWidth, ctrlHeight);
ControlPaint.DrawReversibleFrame(ctrlRectangle, Color.Empty, System.Windows.Forms.FrameStyle.Dashed);
}
}
public void MouseDown(object sender, MouseEventArgs e)
{
if (frm == null)
return;
if (e.X < this.ctrl.Width - 10 || e.Y < this.ctrl.Height - 10)
{
this.IsMoving = true;
this.ctrlLeft = this.frm.DesktopLocation.X + this.Wtap + this.ctrl.Left;
this.ctrlTop = this.frm.DesktopLocation.Y + this.Htap + this.ctrl.Top;
this.cursorL = Cursor.Position.X;
this.cursorT = Cursor.Position.Y;
this.ctrlWidth = this.ctrl.Width;
this.ctrlHeight = this.ctrl.Height;
}
ctrlRectangle.Location = new System.Drawing.Point(this.ctrlLeft, this.ctrlTop);
ctrlRectangle.Size = new System.Drawing.Size(ctrlWidth, ctrlHeight);
ControlPaint.DrawReversibleFrame(ctrlRectangle, Color.Empty, System.Windows.Forms.FrameStyle.Dashed);
}
public void MouseUp(object sender, MouseEventArgs e)
{
if (frm == null)
return;
ctrlIsResizing = false;
if (this.IsMoving)
{
ctrlRectangle.Location = new System.Drawing.Point(this.ctrlLeft, this.ctrlTop);
ctrlRectangle.Size = new System.Drawing.Size(ctrlWidth, ctrlHeight);
ControlPaint.DrawReversibleFrame(ctrlRectangle, Color.Empty, System.Windows.Forms.FrameStyle.Dashed);
this.ctrl.Left = this.ctrlLeft - this.frm.DesktopLocation.X - this.Wtap;
this.ctrl.Top = this.ctrlTop - this.frm.DesktopLocation.Y - this.Htap;
this.IsMoving = false;
this.ctrl.Refresh();
return;
}
ctrlRectangle.Location = new System.Drawing.Point(this.frm.DesktopLocation.X + this.Wtap + this.ctrl.Left, this.frm.DesktopLocation.Y + this.Htap + this.ctrl.Top);
ctrlRectangle.Size = new System.Drawing.Size(ctrlWidth, ctrlHeight);
ControlPaint.DrawReversibleFrame(ctrlRectangle, Color.Empty, System.Windows.Forms.FrameStyle.Dashed);
this.ctrl.Width = ctrlWidth;
this.ctrl.Height = ctrlHeight;
this.ctrl.Refresh();
}

}
}

调用:
private void Form1_Load(object sender, EventArgs e)
{
//WindowsApplication2.ResizeAction rs = new WindowsApplication2.ResizeAction(this.label1,this);
WindowsApplication2.ResizeAction rs = new WindowsApplication2.ResizeAction(this.button1, this);
}
参考：http://www.cnblogs.com/DS-CzY/archive/2007/06/30/801377.aspx

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/yanleigis/archive/2007/10/11/1819447.aspx