C#中WinForm控件的拖动和缩放的实现代码

private enum EnumMousePointPosition    {    MouseSizeNone  = 0, //'无    MouseSizeRight  = 1, //'拉伸右边框    MouseSizeLeft  = 2, //'拉伸左边框    MouseSizeBottom  = 3, //'拉伸下边框    MouseSizeTop  = 4, //'拉伸上边框    MouseSizeTopLeft = 5, //'拉伸左上角    MouseSizeTopRight = 6, //'拉伸右上角    MouseSizeBottomLeft = 7, //'拉伸左下角    MouseSizeBottomRight= 8, //'拉伸右下角    MouseDrag  = 9  // '鼠标拖动    }  

 const int Band = 5;    const int MinWidth=10;    const int MinHeight=10;    private EnumMousePointPosition m_MousePointPosition;    private Point p,p1;  

private void MyMouseDown(object sender,System.Windows.Forms.MouseEventArgs e)  {   p.X=e.X;   p.Y=e.Y;   p1.X=e.X;   p1.Y=e.Y;    }  

 private void MyMouseLeave(object sender, System.EventArgs e)  {   m_MousePointPosition = EnumMousePointPosition.MouseSizeNone;   this.Cursor=Cursors.Arrow;  }  

private EnumMousePointPosition MousePointPosition(Size size,System.Windows.Forms.MouseEventArgs e)  {     if ((e.X >= -1 * Band) | (e.X <= size.Width) | (e.Y >= -1 * Band) | (e.Y <= size.Height))    {   if (e.X < Band)    {    if (e.Y < Band) {return EnumMousePointPosition.MouseSizeTopLeft;}    else     {    if (e.Y > -1 * Band + size.Height)     {return EnumMousePointPosition.MouseSizeBottomLeft;}    else     {return EnumMousePointPosition.MouseSizeLeft;}    }   }   else   {    if (e.X > -1 * Band + size.Width)    {    if (e.Y < Band)    {return EnumMousePointPosition.MouseSizeTopRight;}    else     {     if (e.Y > -1 * Band + size.Height)     {return EnumMousePointPosition.MouseSizeBottomRight;}     else     {return EnumMousePointPosition.MouseSizeRight;}    }    }    else    {    if (e.Y < Band)     {return EnumMousePointPosition.MouseSizeTop;}    else    {     if (e.Y > -1 * Band + size.Height)      {return EnumMousePointPosition.MouseSizeBottom;}     else      {return EnumMousePointPosition.MouseDrag;}    }    }   }   }   else    {return EnumMousePointPosition.MouseSizeNone;}  }  

  private void MyMouseMove(object sender,System.Windows.Forms.MouseEventArgs e)    {    Control lCtrl =(sender as Control);      if (e.Button==MouseButtons.Left)    {     switch (m_MousePointPosition)     {     case EnumMousePointPosition.MouseDrag:         lCtrl.Left =lCtrl.Left+ e.X - p.X;      lCtrl.Top =lCtrl.Top+ e.Y - p.Y;      break;     case EnumMousePointPosition.MouseSizeBottom:      lCtrl.Height = lCtrl.Height + e.Y - p1.Y;      p1.X=e.X;      p1.Y=e.Y; //'记录光标拖动的当前点      break;     case EnumMousePointPosition.MouseSizeBottomRight:      lCtrl.Width  = lCtrl.Width + e.X - p1.X;      lCtrl.Height = lCtrl.Height + e.Y - p1.Y;      p1.X=e.X;      p1.Y=e.Y; //'记录光标拖动的当前点      break;     case EnumMousePointPosition.MouseSizeRight:      lCtrl.Width  = lCtrl.Width + e.X - p1.X;     //    lCtrl.Height = lCtrl.Height + e.Y - p1.Y;      p1.X=e.X;      p1.Y=e.Y; //'记录光标拖动的当前点      break;     case EnumMousePointPosition.MouseSizeTop:      lCtrl.Top  = lCtrl.Top + (e.Y - p.Y);      lCtrl.Height = lCtrl.Height - (e.Y - p.Y);      break;     case EnumMousePointPosition.MouseSizeLeft:      lCtrl.Left  = lCtrl.Left + e.X - p.X;      lCtrl.Width  = lCtrl.Width - (e.X - p.X);      break;     case EnumMousePointPosition.MouseSizeBottomLeft:      lCtrl.Left  = lCtrl.Left + e.X - p.X;      lCtrl.Width  = lCtrl.Width - (e.X - p.X);      lCtrl.Height = lCtrl.Height+ e.Y - p1.Y;      p1.X=e.X;      p1.Y=e.Y; //'记录光标拖动的当前点      break;     case EnumMousePointPosition.MouseSizeTopRight:      lCtrl.Top  = lCtrl.Top + (e.Y - p.Y);      lCtrl.Width  = lCtrl.Width + (e.X - p1.X);      lCtrl.Height = lCtrl.Height - (e.Y - p.Y);      p1.X=e.X;      p1.Y=e.Y; //'记录光标拖动的当前点      break;     case EnumMousePointPosition.MouseSizeTopLeft:      lCtrl.Left  = lCtrl.Left + e.X - p.X;      lCtrl.Top  = lCtrl.Top + (e.Y - p.Y);      lCtrl.Width  = lCtrl.Width - (e.X - p.X);      lCtrl.Height = lCtrl.Height - (e.Y - p.Y);      break;     default:      break;     }     if (lCtrl.Width<MinWidth) lCtrl.Width=MinWidth;     if (lCtrl.Height<MinHeight) lCtrl.Height=MinHeight;         }    else    {     m_MousePointPosition = MousePointPosition(lCtrl.Size, e);  //'判断光标的位置状态     switch (m_MousePointPosition)  //'改变光标     {     case EnumMousePointPosition.MouseSizeNone:      this.Cursor = Cursors.Arrow;    //'箭头      break;     case EnumMousePointPosition.MouseDrag:      this.Cursor = Cursors.SizeAll;   //'四方向      break;     case EnumMousePointPosition.MouseSizeBottom:      this.Cursor = Cursors.SizeNS;    //'南北      break;     case EnumMousePointPosition.MouseSizeTop:      this.Cursor = Cursors.SizeNS;    //'南北      break;     case EnumMousePointPosition.MouseSizeLeft:      this.Cursor = Cursors.SizeWE;    //'东西      break;     case EnumMousePointPosition.MouseSizeRight:      this.Cursor = Cursors.SizeWE;    //'东西      break;     case EnumMousePointPosition.MouseSizeBottomLeft:      this.Cursor = Cursors.SizeNESW;   //'东北到南西      break;     case EnumMousePointPosition.MouseSizeBottomRight:      this.Cursor = Cursors.SizeNWSE;   //'东南到西北      break;     case EnumMousePointPosition.MouseSizeTopLeft:      this.Cursor = Cursors.SizeNWSE;   //'东南到西北      break;     case EnumMousePointPosition.MouseSizeTopRight:      this.Cursor = Cursors.SizeNESW;   //'东北到南西      break;     default:      break;     }    }      }  

 private void initProperty()  {   for(int i = 0; i < this.panel1.Controls.Count; i++)    {    this.panel1.Controls[i].MouseDown+= new System.Windows.Forms.MouseEventHandler(MyMouseDown);   this.panel1.Controls[i].MouseLeave+= new System.EventHandler(MyMouseLeave);   this.panel1.Controls[i].MouseMove += new System.Windows.Forms.MouseEventHandler(MyMouseMove);   }    }