WPF：使窗口不可调整大小，但保留框架？

Question

我有一个没有标题栏的窗口（WindowStyle == WindowStyle.None）。整个窗户采用了 Aero 玻璃效果。当我使窗口不可调整大小（ResizeMode == ResizeMode.NoResize）时，玻璃效果消失，我的控件只是挂在半空中。 （本质上，窗口本身消失了，但留下了它的内容。）

有没有办法让我在不删除窗框的情况下使窗口不可调整大小？

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我已阅读问题在 a 上启用 Vista 玻璃效果无边框 WPF 窗口，但这并不是我想要的——我想保留窗口边框。有关我希望窗口的外观的示例，请在启用 Aero 的情况下按 Alt+Tab。

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澄清一下，当鼠标悬停在窗口边框上时，我根本不希望显示调整大小光标。这基本上就是我希望我的窗口看起来像的样子：

该解决方案不必严格是 WPF——我可以通过使用 Win32 API 来实现这一点。

Answer 1

您可以挂钩 wndproc 并拦截 WM_WINDOWPOSCHANGING信息。严格来说不是 WPF，但可能是您最好的选择。

如果您想隐藏调整大小光标，那么最好的选择是拦截 WM_NCHITTEST。调用DefWindowProc（获取默认行为），并测试返回值；如果是HTBOTTOM、HTBOTTOMLEFT、HTBOTTOMRIGHT、HTTOP、HTTOPLEFT或HTTOPRIGHT，则将返回值更改为HTBORDER。

Answer 2

基于埃里克的回答。

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>

Answer 3

一种黑客方法是设置 MinWidth/MaxWidth 和 MinHeight/MaxHeight 属性以有效地使其不可调整大小。当然，问题是您仍然会在边框上看到调整大小光标。

Answer 4

为什么不直接为窗口创建这个窗口边框呢？
它使用偏移量来设置窗口的颜色。
因此，一个简单的方法就是在窗口周围包裹整个边框，然后在其上获得自己的颜色！