c# - WPF 玻璃窗口，无边框且无焦点调整大小

Question

我正在尝试使用. _ _ 然而，由于某种奇怪的原因，这个窗口的玻璃颜色看起来好像窗口失焦了。正如您在接下来的三个图像中看到的那样，带有边框的普通窗口（例如图 1 和图 2）工作得很好并且反应如预期（焦点为深蓝色，失焦时为白色（= 非活动））。DwmEnableBlurBehindWindowDmwAPI

允许调整大小的无边框窗口显示相同的行为：

然而，不可调整大小的无边框窗口无论是处于活动状态还是处于非活动状态，都将始终看起来好像失焦（如您在最后一个图 3中所见）。它总是看起来发白：

这是我如何设置玻璃样式的一些示例代码：

public MainWindow()
{
    InitializeComponent();

    WindowStyle = WindowStyle.None;
    ResizeMode = ResizeMode.NoResize;

    Height = 200;

    Background = Brushes.Transparent;
    Loaded += MainWindow_Loaded;
}
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
    var windowInteropHelper = new WindowInteropHelper(this);
    var handle = windowInteropHelper.Handle;
    var mainWindowSrc = HwndSource.FromHwnd(handle);

    if (mainWindowSrc != null)
        if (mainWindowSrc.CompositionTarget != null)
            mainWindowSrc.CompositionTarget.BackgroundColor = Color.FromArgb(0, 0, 0, 0);
    var glassParams = new DwmApi.DwmBlurbehind
    {
        dwFlags = DwmApi.DwmBlurbehind.DWM_BB_ENABLE,
        fEnable = true,
        hRegionBlur = IntPtr.Zero
    };

    IntPtr dis = new IntPtr(2);
    DwmApi.DwmSetWindowAttribute(mainWindowSrc.Handle,
                DwmApi.DwmWindowAttribute.DWMWA_LAST,
                dis,
                sizeof(uint));

    DwmApi.DwmEnableBlurBehindWindow(
        handle,
        glassParams
        );
}

我尝试聚焦窗口，但这似乎不会影响行为。关于如何解决这个问题的任何想法或指示？

Answer 1

我在 dwm apis 中工作不多，所以我可能错了，但我认为默认的 dwm 渲染策略是使用 WindowStyle 来计算渲染。如果您禁用该策略，它的行为将与您预期的一样。

添加以下内容来修复你的忧郁 xD

const int DWMWA_NCRENDERING_POLICY = 2;
int DWMNCRP_DISABLED = 2;

DwmSetWindowAttribute(hwnd, DWMWA_NCRENDERING_POLICY, ref DWMNCRP_DISABLED, sizeof(int));

有关此巫毒的详细信息，请查看以下资源：

DwmSetWindowAttribute 函数

DWMWINDOWATTRIBUTE 枚举

主窗口.xaml

<Window x:Class="dwm.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"/>

主窗口.xaml.cs

using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Media;

namespace dwm
{
    public partial class MainWindow
    {
        [DllImport("dwmapi.dll", PreserveSig = false)]
        public static extern void DwmEnableBlurBehindWindow(IntPtr hwnd, ref DwmBlurbehind blurBehind);

        [DllImport("dwmapi.dll", PreserveSig = true)]
        private static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);

        public MainWindow()
        {
            InitializeComponent();
        }

        protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);

            var bb = new DwmBlurbehind
            {
                dwFlags = CoreNativeMethods.DwmBlurBehindDwFlags.DwmBbEnable,
                Enabled = true
            };

            WindowStartupLocation = WindowStartupLocation.CenterScreen;
            Background = Brushes.Transparent;
            ResizeMode = ResizeMode.NoResize;
            WindowStyle = WindowStyle.None;

            Focus();

            var hwnd = new WindowInteropHelper(this).Handle;

            HwndSource.FromHwnd(hwnd).CompositionTarget.BackgroundColor = Colors.Transparent;

            DwmEnableBlurBehindWindow(hwnd, ref bb);

            const int dwmwaNcrenderingPolicy = 2;
            var dwmncrpDisabled = 2;

            DwmSetWindowAttribute(hwnd, dwmwaNcrenderingPolicy, ref dwmncrpDisabled, sizeof(int));
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct DwmBlurbehind
        {
            public CoreNativeMethods.DwmBlurBehindDwFlags dwFlags;
            public bool Enabled;
            public IntPtr BlurRegion;
            public bool TransitionOnMaximized;
        }

        public static class CoreNativeMethods
        {
            public enum DwmBlurBehindDwFlags
            {
                DwmBbEnable = 1,
                DwmBbBlurRegion = 2,
                DwmBbTransitionOnMaximized = 4
            }
        }
    }
}

带焦点的屏幕截图

没有焦点的截图

测试环境

操作系统：Windows 8 - x64

主题：标准窗户