c# - 模糊半透明形式的背景(例如Aero玻璃)

我有一个无边界且不可调整大小的WPF表单(WindowStyle = None，AllowsTransparency = True，ResizeMode = NoResize)，背景为半透明。这是该窗体(一个半透明的红色矩形)在记事本上运行时的外观的图片:

但是，我希望背景像毛玻璃一样模糊，除非没有所有花哨的窗口边框和带有条纹的彩色背景-我想自己解决这个问题。这是我希望它看起来像的样机:

如何以最有效的方式实现这一目标？

WinForms或WPF对我来说很好。希望它应该使用Aero玻璃使用的相同的东西(我很好，只有在启用Aero的情况下才能使用)，而不是像捕获下面的屏幕区域作为位图并将其模糊那样疯狂的事情。

这是我不想要的照片:

我知道这是可行的，我知道该怎么做，但是我不希望整个Aero玻璃窗口 Chrome ，或者边框和标题栏，或者窗口不具有用户设置的Aero玻璃颜色，只是模糊窗口/窗体下方的任何内容。

最佳答案

如果要使用Aero模糊，则可以使用 DwmEnableBlurBehindWindow API。这是利用此示例的派生Window的示例。

public class BlurWindow : Window
{
    #region Constants

    private const int WM_DWMCOMPOSITIONCHANGED = 0x031E;
    private const int DWM_BB_ENABLE = 0x1;

    #endregion //Constants

    #region Structures
    [StructLayout( LayoutKind.Sequential )]
    private struct DWM_BLURBEHIND
    {
        public int dwFlags;
        public bool fEnable;
        public IntPtr hRgnBlur;
        public bool fTransitionOnMaximized;
    }

    [StructLayout( LayoutKind.Sequential )]
    private struct MARGINS
    {
        public int cxLeftWidth;
        public int cxRightWidth;
        public int cyTopHeight;
        public int cyBottomHeight;
    }
    #endregion //Structures

    #region APIs

    [DllImport( "dwmapi.dll", PreserveSig = false )]
    private static extern void DwmEnableBlurBehindWindow(IntPtr hwnd, ref DWM_BLURBEHIND blurBehind);

    [DllImport( "dwmapi.dll" )]
    private static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMargins);

    [DllImport( "dwmapi.dll", PreserveSig = false )]
    private static extern bool DwmIsCompositionEnabled();

    #endregion //APIs

    #region Constructor
    public BlurWindow()
    {
        this.WindowStyle = System.Windows.WindowStyle.None;
        this.ResizeMode = System.Windows.ResizeMode.NoResize;
        this.Background = Brushes.Transparent;
    }
    #endregion //Constructor

    #region Base class overrides
    protected override void OnSourceInitialized(EventArgs e)
    {
        base.OnSourceInitialized( e );

        if ( Environment.OSVersion.Version.Major >= 6 )
        {
            var hwnd = new WindowInteropHelper( this ).Handle;
            var hs = HwndSource.FromHwnd( hwnd );
            hs.CompositionTarget.BackgroundColor = Colors.Transparent;

            hs.AddHook( new HwndSourceHook( this.WndProc ) );
            this.InitializeGlass( hwnd );
        }
    }
    #endregion //Base class overrides

    #region Methods

    #region InitializeGlass
    private void InitializeGlass(IntPtr hwnd)
    {
        if ( !DwmIsCompositionEnabled() )
            return;

        // fill the background with glass
        var margins = new MARGINS();
        margins.cxLeftWidth = margins.cxRightWidth = margins.cyBottomHeight = margins.cyTopHeight = -1;
        DwmExtendFrameIntoClientArea( hwnd, ref margins );

        // initialize blur for the window
        DWM_BLURBEHIND bbh = new DWM_BLURBEHIND();
        bbh.fEnable = true;
        bbh.dwFlags = DWM_BB_ENABLE;
        DwmEnableBlurBehindWindow( hwnd, ref bbh );
    }
    #endregion //InitializeGlass

    #region WndProc
    private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
    {
        if ( msg == WM_DWMCOMPOSITIONCHANGED )
        {
            this.InitializeGlass( hwnd );
            handled = false;
        }

        return IntPtr.Zero;
    }
    #endregion //WndProc

    #endregion //Methods
}

这是使用BlurWindow的代码段。

var w = new BlurWindow();
w.Width = 100;
w.Height = 100;
w.MouseLeftButtonDown += (s1, e1) => {
    ((Window)s1).DragMove();
    e1.Handled = true;
};
w.Background = new SolidColorBrush( Color.FromArgb( 75, 255, 0, 0 ) );
w.Show();