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C#中WinForm控件的拖动和缩放的实现代码

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本篇文章主要介绍了C#中WinForm控件的拖动和缩放的实现代码，C# WinForm控件的拖动和缩放是个很有用的功能，有兴趣的可以了解一下。

C# WinForm控件的拖动和缩放是个很有用的功能。实现起来其实很简单的，主要是设计控件的MouseDown、MouseLeave、MouseMove事件,下面的几个步骤将逐步实现C# WinForm控件的拖动和缩放的功能。

1、定义一个枚举类型，描述光标状态  

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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 
  }

2、定义几个变量  

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

3、定义自己的MyMouseDown事件   

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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;   
} 

4、定义自己的MyMouseLeave事件  

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

5、设计一个函数，确定光标在控件不同位置的样式   

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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;} 
} 

6、定义自己的MyMouseMove事件，在这个事件里，会使用上面设计的函数    

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  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; 
   } 
  } 
  
  } 

7、制作一个初始化过程，将界面panel1上的所有控件都绑定MyMouseDown、MyMouseLeave、MyMouseMove事件，记得在Form初始化或者Form_Load时先执行它。  

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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); 
 } 
  
} 

8、ok，在运行之前你在panel1上放几个控件，执行程序，应该可以随便移动、改变其大小了 

C# WinForm控件的拖动和缩放的实现就此完成。 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持米米素材网。

原文链接：http://blog.csdn.net/u012252959/article/details/50563304