发出“显示桌面”时,Windows 不会最小化。而是将“WorkerW”和“Desktop”窗口置于前台。
我最终开发了自己的解决方案。
我在互联网上搜索了数周试图找到答案,所以我为这个感到自豪。
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。
每当前台窗口发生变化时都会触发此事件。
现在我注意到当“显示桌面”命令发出时,WorkerW 窗口类变成了前台。
注意这个 WorkerW 窗口不是桌面,我确认这个 WorkerW 窗口的 hwnd 不是桌面 hwnd。
所以我们所做的就是每当 WorkerW 窗口成为前台时,我们将“WPF Gadget Window”设置为最顶层!
当 WorkerW 窗口以外的窗口成为前景时,我们会从“WPF 小工具窗口”中移除最顶层。
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,如果用户在不同的显示器上单击其桌面,这将导致您的窗口变为最顶部。就我而言,我不希望这种行为,但我想你们中的一些人可能会。
确认可以在 Windows 10 中运行。应该可以在旧版本的 Windows 中运行。
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; }
}
}