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[ASP.net教程]C# Winform实现炫酷的透明动画界面


做过.NET Winform窗体美化的人应该都很熟悉UpdateLayeredWindow吧,UpdateLayeredWindow可以实现窗体的任意透明,效果很好,不会有毛边。不过使用这个API之后,会有一个问题就是无法使用普通控件,而且没有Paint消息。为了解决这个问题,有两种方法。

一、使用双层窗体,底层窗体使用UpdateLayeredWindow作为背景,上层窗体用普通窗体,并且可以使用TransparencyKey或者Region来实现去除不需要的窗体内容,让上层窗体能看到底层的窗体。

二、直接单层窗体,使用控件的DrawToBitmap把控件图像绘制到UpdateLayeredWindow的窗体上,这样就可以看到普通控件了。不过这个也有问题:1.控件内容不能自动更新  2.效率低,很多控件使用DrawToBitmap绘制出的图像不完整,甚至绘制不出图像。比如TextBox无法显示光标,WebBrowser无法显示内容。

 三、采用DirectUI技术,重写所有基础控件。效果最好,不过工作量巨大。

 

使用UpdateLayeredWindow时,一般是需要对Bitmap缓存起来,通过设置剪辑区域,局部重绘来提高效率。另外还可以异步重绘,模拟Winform的失效到重绘。

 

有些人会说为什么不直接用WPF啊,Wpf和Winform各有优缺点,适应不同的场合。Winform相对于使用更简单一些,系统要求更低。当然需要看人的习惯了和擅长的。

 

UpdateLayeredWindow 基本使用方法:

重写窗体的 CreateParams 属性

protected  override CreateParams CreateParams      {       get          {         CreateParams cp =  base .CreateParams;         cp.ExStyle |=  0x00080000 ; // WS_EX_LAYERED 扩展样式          return cp;       }     } 

  

API调用:

     public  void SetBitmap(Bitmap bitmap, byte opacity)       {       if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)         throw  new ApplicationException( "位图必须是32位包含alpha 通道" );       IntPtr screenDc = Win32.GetDC(IntPtr.Zero);       IntPtr memDc = Win32.CreateCompatibleDC(screenDc);       IntPtr hBitmap = IntPtr.Zero;       IntPtr oldBitmap = IntPtr.Zero;        try          {         hBitmap = bitmap.GetHbitmap(Color.FromArgb( 0 ));  // 创建GDI位图句柄,效率较低         oldBitmap = Win32.SelectObject(memDc, hBitmap);         Win32.Size size =  new Win32.Size(bitmap.Width, bitmap.Height);         Win32.Point pointSource =  new Win32.Point( 0 , 0 );         Win32.Point topPos =  new Win32.Point(Left, Top);         Win32.BLENDFUNCTION blend =  new Win32.BLENDFUNCTION();         blend.BlendOp       = Win32.AC_SRC_OVER;         blend.BlendFlags      =  0 ;         blend.SourceConstantAlpha = opacity;         blend.AlphaFormat     = Win32.AC_SRC_ALPHA;         Win32.UpdateLayeredWindow(Handle, screenDc, ref topPos, ref size, memDc, ref pointSource, 0 , ref blend, Win32.ULW_ALPHA);       }        finally          {         Win32.ReleaseDC(IntPtr.Zero, screenDc);         if (hBitmap != IntPtr.Zero)            {           Win32.SelectObject(memDc, oldBitmap);                     Win32.DeleteObject(hBitmap);         }         Win32.DeleteDC(memDc);       }     } 

  

API声明:

   class Win32     {     public  enum Bool       {       False =  0 ,       True     } ;      [StructLayout(LayoutKind.Sequential)]     public  struct Point       {       public Int32 x;       public Int32 y;        public Point(Int32 x, Int32 y)         { this .x = x; this .y = y; }     }      [StructLayout(LayoutKind.Sequential)]     public  struct Size       {       public Int32 cx;       public Int32 cy;        public Size(Int32 cx, Int32 cy)          { this .cx = cx; this .cy = cy; }     }      [StructLayout(LayoutKind.Sequential, Pack =  1 )]     struct ARGB       {       public  byte Blue;       public  byte Green;       public  byte Red;       public  byte Alpha;     }      [StructLayout(LayoutKind.Sequential, Pack =  1 )]     public  struct BLENDFUNCTION       {       public  byte BlendOp;       public  byte BlendFlags;       public  byte SourceConstantAlpha;       public  byte AlphaFormat;     }       public  const Int32 ULW_COLORKEY =  0x00000001 ;     public  const Int32 ULW_ALPHA =  0x00000002 ;     public  const Int32 ULW_OPAQUE =  0x00000004 ;      public  const  byte AC_SRC_OVER =  0x00 ;     public  const  byte AC_SRC_ALPHA =  0x01 ;      [DllImport( " user32.dll " , ExactSpelling =  true , SetLastError =  true )]     public  static  extern Bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref Point pptDst, ref Size psize, IntPtr hdcSrc, ref Point pprSrc, Int32 crKey, ref BLENDFUNCTION pblend, Int32 dwFlags);     [DllImport( " user32.dll " , ExactSpelling =  true , SetLastError =  true )]     public  static  extern IntPtr GetDC(IntPtr hWnd);     [DllImport( " user32.dll " , ExactSpelling =  true )]     public  static  extern  int ReleaseDC(IntPtr hWnd, IntPtr hDC);     [DllImport( " gdi32.dll " , ExactSpelling =  true , SetLastError =  true )]     public  static  extern IntPtr CreateCompatibleDC(IntPtr hDC);     [DllImport( " gdi32.dll " , ExactSpelling =  true , SetLastError =  true )]     public  static  extern Bool DeleteDC(IntPtr hdc);     [DllImport( " gdi32.dll " , ExactSpelling =  true )]     public  static  extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);     [DllImport( " gdi32.dll " , ExactSpelling =  true , SetLastError =  true )]     public  static  extern Bool DeleteObject(IntPtr hObject);     [DllImport( " user32.dll " , EntryPoint =  " SendMessage " )]     public  static  extern  int SendMessage( int hWnd, int wMsg, int wParam, int lParam);     [DllImport( " user32.dll " , EntryPoint =  " ReleaseCapture " )]      public  static  extern  int ReleaseCapture();     public  const  int WM_SysCommand =  0x0112 ;     public  const  int SC_MOVE =  0xF012 ;      public  const  int SC_MAXIMIZE =  61488 ;     public  const  int SC_MINIMIZE =  61472 ;   } 

  

需要呈现图像的时候调用 SetBitmap 方法。只要优化好,呈现效率比普通的Paint重绘方式高很多,并且不卡不闪烁,支持任意透明。

 

下面是自己开发出来的效果:

 

这个是用OpenGL绘制的

推荐一款C#界面库:DSkin界面库(Winform平台首个DirectUI界面库)  http://d.cskin.net

 
Winform也可以很炫丽的!