WPF:让窗口不可靠,但保持框架？

Question

我有一个没有标题栏的窗口(WindowStyle == WindowStyle.None).整个窗口使用Aero玻璃效果.当我使窗口不可靠(ResizeMode == ResizeMode.NoResize)时,玻璃效果消失,我的控件只悬挂在半空中.(基本上,窗口本身会消失,但会留下内容.)

有没有办法让我在不摆脱窗框的情况下使窗户不可靠？

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我已经阅读了在无边界WPF窗口上启用Vista玻璃效果的问题,但这不是我想要的 - 我想保持窗口边框.有关我希望窗口看起来像什么的示例,请在启用Aero的情况下点击Alt + Tab.

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为了澄清,我不希望将鼠标悬停在窗口边框上时显示调整大小的游标.这基本上就是我希望我的窗口看起来像:

投影仪http://i37.tinypic.com/2mg4jty.png

解决方案不一定是严格的WPF - 我很好地使用Win32 API进行攻击以实现此目的.

Answer 1

您可以挂钩wndproc并拦截WM_WINDOWPOSCHANGING消息.不是严格的WPF,但可能是你最好的选择.

如果你想隐藏调整大小的游标,那么你最好的办法就是拦截WM_NCHITTEST.调用DefWindowProc(获取默认行为),并测试返回值; 如果它是HTBOTTOM,HTBOTTOMLEFT,HTBOTTOMRIGHT,HTTOP,HTTOPLEFT或HTTOPRIGHT,则将返回值更改为HTBORDER.

Answer 2

基于Erics的回答.

public partial class MainWindow : Window
{
    [DllImport("DwmApi.dll")]
    public static extern int DwmExtendFrameIntoClientArea(
        IntPtr hwnd,
        ref MARGINS pMarInset);

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern IntPtr DefWindowProc(
        IntPtr hWnd,
        int msg,
        IntPtr wParam,
        IntPtr lParam);

    private const int WM_NCHITTEST = 0x0084;
    private const int HTBORDER = 18;
    private const int HTBOTTOM = 15;
    private const int HTBOTTOMLEFT = 16;
    private const int HTBOTTOMRIGHT = 17;
    private const int HTLEFT = 10;
    private const int HTRIGHT = 11;
    private const int HTTOP = 12;
    private const int HTTOPLEFT = 13;
    private const int HTTOPRIGHT = 14;

    public MainWindow()
    {
        InitializeComponent();

        this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
    }

    void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        try
        {
            // Obtain the window handle for WPF application
            IntPtr mainWindowPtr = new WindowInteropHelper(this).Handle;
            HwndSource mainWindowSrc = HwndSource.FromHwnd(mainWindowPtr);
            mainWindowSrc.CompositionTarget.BackgroundColor = Color.FromArgb(0, 0, 0, 0);
            mainWindowSrc.AddHook(WndProc);

            // Set Margins
            MARGINS margins = new MARGINS();
            margins.cxLeftWidth = 10;
            margins.cxRightWidth = 10;
            margins.cyBottomHeight = 10;
            margins.cyTopHeight = 10;

            int hr = DwmExtendFrameIntoClientArea(mainWindowSrc.Handle, ref margins);
            //
            if (hr < 0)
            {
                //DwmExtendFrameIntoClientArea Failed
            }
        }
        // If not Vista, paint background white.
        catch (DllNotFoundException)
        {
            Application.Current.MainWindow.Background = Brushes.White;
        }
    }

    private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
    {
        // Override the window hit test
        // and if the cursor is over a resize border,
        // return a standard border result instead.
        if (msg == WM_NCHITTEST)
        {
            handled = true;
            var htLocation = DefWindowProc(hwnd, msg, wParam, lParam).ToInt32();
            switch (htLocation)
            {
                case HTBOTTOM:
                case HTBOTTOMLEFT:
                case HTBOTTOMRIGHT:
                case HTLEFT:
                case HTRIGHT:
                case HTTOP:
                case HTTOPLEFT:
                case HTTOPRIGHT:
                    htLocation = HTBORDER;
                    break;
            }

            return new IntPtr(htLocation);
        }

        return IntPtr.Zero;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        this.Close();
    }
}

[StructLayout(LayoutKind.Sequential)]
public struct MARGINS
{
    public int cxLeftWidth;      // width of left border that retains its size
    public int cxRightWidth;     // width of right border that retains its size
    public int cyTopHeight;      // height of top border that retains its size
    public int cyBottomHeight;   // height of bottom border that retains its size
};

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="150" Width="200" 
    Background="Transparent"
    WindowStyle="None"
    ResizeMode="CanResize"
>
    <Grid Background="White" Margin="10,10,10,10">
        <Button Content="Go Away" Click="Button_Click" Height="20" Width="100" />
    </Grid>
</Window>