C#中WinForm控制項的拖動和縮放實現的代碼分享

本篇文章主要介紹了C#中WinForm控制項的拖動和縮放的實現代碼，C# WinForm控制項的拖動和縮放是個很有用的功能，有興趣的可以瞭解一下。

C# WinForm控制項的拖動和縮放是個很有用的功能。實現起來其實很簡單的，主要是設計控制項的MouseDown、MouseLeave、MouseMove事件,下面的幾個步驟將逐步實現C# WinForm控制項的拖動和縮放的功能。

1、定義一個枚舉類型，描述游標狀態

private enum EnumMousePointPosition    {    MouseSizeNone  = 0, //'無    MouseSizeRight  = 1, //'展開右邊框    MouseSizeLeft  = 2, //'展開左邊框    MouseSizeBottom  = 3, //'展開下邊框    MouseSizeTop  = 4, //'展開上邊框    MouseSizeTopLeft = 5, //'展開左上方    MouseSizeTopRight = 6, //'展開右上方    MouseSizeBottomLeft = 7, //'展開左下角    MouseSizeBottomRight= 8, //'展開右下角    MouseDrag  = 9  // '滑鼠拖動    }

2、定義幾個變數

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

3、定義自己的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、定義自己的MyMouseLeave事件

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

5、設計一個函數，確定游標在控制項不同位置的樣式

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、定義自己的MyMouseMove事件，在這個事件裡，會使用上面設計的函數

  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; //'記錄游標拖動的當前點      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; //'記錄游標拖動的當前點      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; //'記錄游標拖動的當前點      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; //'記錄游標拖動的當前點      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; //'記錄游標拖動的當前點      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);  //'判斷游標的位置狀態     switch (m_MousePointPosition)  //'改變游標     {     case EnumMousePointPosition.MouseSizeNone:      this.Cursor = Cursors.Arrow;    //'箭頭      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;    //'東西      break;     case EnumMousePointPosition.MouseSizeRight:      this.Cursor = Cursors.SizeWE;    //'東西      break;     case EnumMousePointPosition.MouseSizeBottomLeft:      this.Cursor = Cursors.SizeNESW;   //'東北到南西      break;     case EnumMousePointPosition.MouseSizeBottomRight:      this.Cursor = Cursors.SizeNWSE;   //'東南到西北      break;     case EnumMousePointPosition.MouseSizeTopLeft:      this.Cursor = Cursors.SizeNWSE;   //'東南到西北      break;     case EnumMousePointPosition.MouseSizeTopRight:      this.Cursor = Cursors.SizeNESW;   //'東北到南西      break;     default:      break;     }    }      }

7、製作一個初始化過程，將介面panel1上的所有控制項都綁定MyMouseDown、MyMouseLeave、MyMouseMove事件，記得在Form初始化或者Form_Load時先執行它。

 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);   }    }

8、ok，在運行之前你在panel1上放幾個控制項，執行程式，應該可以隨便移動、改變其大小了

C# WinForm控制項的拖動和縮放的實現就此完成。