C# Control Drag and Move

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C# Control Drag and Move

主要是设计控件的MouseDown、MouseLeave、MouseMove事件。一步步来吧：
1、定义一个枚举类型，描述光标状态
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
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
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
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
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
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。

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);
   }

}