Question

当用户点击show desktop按钮时，如何防止WPF窗口最小化？

Answer 1

此链接可以帮助您：Get the minimize box click of a WPF window

你需要抓住事件并自己处理。

编辑：一旦状态发生变化，此方法将提醒您，因此它可能不是“最佳”解决方案，但它可以正常工作。

Answer 2

发布“显示桌面”时，Windows不会最小化。相反，“WorkerW”和“桌面”窗口被带到前台。

我最终开发了自己的解决方案。我在互联网上搜索了几个星期，试图找到答案，所以我为这一点感到自豪。

所以我们要做的是使用pinvoke为EVENT_SYSTEM_FOREGROUND窗口事件创建一个钩子。只要前景窗口发生变化，就会触发此事件。

现在我注意到当发出“Show Desktop”命令时，WorkerW窗口类变为前景。

请注意，此WorkerW窗口不是桌面，我确认此WorkerW窗口的hwnd不是Desktop hwnd。

所以我们所做的就是当WorkerW窗口成为前景时，我们将“WPF Gadget Window”设置为最顶层！

每当WorkerW窗口的其他窗口成为前景时，我们从“WPF Gadget Window”中删除最顶层的窗口。

如果你想更进一步，你可以取消注释我检查新前景窗口是否也是“PROGMAN”的部分，即桌面窗口。

但是，如果用户在其他显示器上单击其桌面，这将导致您的窗口成为最顶层。在我的情况下，我不想要这种行为，但我想你们中的一些人可能。

确认可以在Windows 10中使用。应该适用于旧版本的Windows。

using System;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows;

namespace YourNamespace
{
    internal static class NativeMethods
    {
        [DllImport("user32.dll")]
        internal static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr hmodWinEventProc, ShowDesktop.WinEventDelegate lpfnWinEventProc, uint idProcess, uint idThread, uint dwFlags);

        [DllImport("user32.dll")]
        internal static extern bool UnhookWinEvent(IntPtr hWinEventHook);

        [DllImport("user32.dll")]
        internal static extern int GetClassName(IntPtr hwnd, StringBuilder name, int count);
    }

    public static class ShowDesktop
    {
        private const uint WINEVENT_OUTOFCONTEXT = 0u;
        private const uint EVENT_SYSTEM_FOREGROUND = 3u;

        private const string WORKERW = "WorkerW";
        private const string PROGMAN = "Progman";

        public static void AddHook(Window window)
        {
            if (IsHooked)
            {
                return;
            }

            IsHooked = true;

            _delegate = new WinEventDelegate(WinEventHook);
            _hookIntPtr = NativeMethods.SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_FOREGROUND, IntPtr.Zero, _delegate, 0, 0, WINEVENT_OUTOFCONTEXT);
            _window = window;
        }

        public static void RemoveHook()
        {
            if (!IsHooked)
            {
                return;
            }

            IsHooked = false;

            NativeMethods.UnhookWinEvent(_hookIntPtr.Value);

            _delegate = null;
            _hookIntPtr = null;
            _window = null;
        }

        private static string GetWindowClass(IntPtr hwnd)
        {
            StringBuilder _sb = new StringBuilder(32);
            NativeMethods.GetClassName(hwnd, _sb, _sb.Capacity);
            return _sb.ToString();
        }

        internal delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime);

        private static void WinEventHook(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
        {
            if (eventType == EVENT_SYSTEM_FOREGROUND)
            {
                string _class = GetWindowClass(hwnd);

                if (string.Equals(_class, WORKERW, StringComparison.Ordinal) /*|| string.Equals(_class, PROGMAN, StringComparison.Ordinal)*/ )
                {
                    _window.Topmost = true;
                }
                else
                {
                    _window.Topmost = false;
                }
            }
        }

        public static bool IsHooked { get; private set; } = false;

        private static IntPtr? _hookIntPtr { get; set; }

        private static WinEventDelegate _delegate { get; set; }

        private static Window _window { get; set; }
    }
}

Answer 3

您可以将窗口的父级更改为不受Show Desktop的影响。（如此处所述：Window "on desktop"）

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        Loaded += MainWindowLoaded;
    }

    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

    private void MainWindowLoaded(object sender, RoutedEventArgs e)
    {
        var hwnd = new WindowInteropHelper(this).Handle;
        var ProgmanHwnd = FindWindowEx(FindWindowEx(FindWindow("Progman", "Program Manager"), IntPtr.Zero, "SHELLDLL_DefView",""), IntPtr.Zero,"SysListView32", "FolderView");
        SetParent(hwnd, ProgmanHwnd);
    }

}

如何防止窗口最小化？

3 个答案: