怎样在wpf中自定义鼠标指针

看看WPF Cursor类的两个构造函数吧:

public Cursor(Stream cursorStream) public Cursor(string cursorFile)

 

恩, 均要求用 ani 或 cur, 无语啊,我要使用一张普通图片呢? 或者甚至是在程序内存中动态生成一张图片而生成鼠标指针呢?
于是乎, 我们可以折腾出如下代码, 它可以从由一张图片来创建鼠标指针:

    ///<summary>     /// This class allow you create a Cursor form a Bitmap     ///</summary>    internalclass BitmapCursor : SafeHandle     {
        publicoverridebool IsInvalid         {             get             {                 return handle == (IntPtr)(-1);             }         }
        publicstatic Cursor CreateBmpCursor(Bitmap cursorBitmap)         {
            var c =new BitmapCursor(cursorBitmap);
            return CursorInteropHelper.Create(c);         }
         protected BitmapCursor(Bitmap cursorBitmap)             : base((IntPtr)(-1), true)         {             handle = cursorBitmap.GetHicon();         }
        protectedoverridebool ReleaseHandle()         {             bool result = DestroyIcon(handle);
            handle = (IntPtr)(-1);
            return result;         }
        [DllImport("user32")]         privatestaticexternbool DestroyIcon(IntPtr hIcon);     }

 

下面是一段示例代码:

        privatestatic Cursor CreateMyCursor()         {             constint w =25;             constint h =25;             constint f =4;
            var bmp =new Bitmap(w, h);
            Graphics g = Graphics.FromImage(bmp);             g.SmoothingMode = SmoothingMode.HighQuality;             g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            var pen =new Pen(Brushes.Black, 2.0F);
            g.DrawEllipse(pen, new Rectangle(f, f, w -2* f, w -2* f));
            g.Flush();             g.Dispose();             pen.Dispose();
            return BitmapCursor.CreateBmpCursor(bmp);         }

 

 

有人会说"啊!Bitmap? WinForm的! 就不可以从WPF的图像来生成么?" 那么免费赠送如下函数:

        publicstatic Bitmap BitmapSourceToBitmap(this BitmapSource source)         {             using (var stream =new MemoryStream())             {                 var e =new BmpBitmapEncoder();                 e.Frames.Add(BitmapFrame.Create(source));                 e.Save(stream);
                var bmp =new Bitmap(stream);
                return bmp;             }         }

 

 

 

 

转载自：http://www.cnblogs.com/zhouyinhui/archive/2010/05/28/1746502.html