mirror of
https://github.com/wwiinnddyy/LanMountainDesktop.git
synced 2026-08-18 15:33:33 +08:00
refactor: 新建 Platform 平台差异层，主工程 P/Invoke 全部迁出
- 新增 Platform.Abstractions（接口+NoOp+PlatformLog 日志桥）、 Platform.Windows、Platform.MacOS、Platform.Android 四个项目 - 迁移电源管理、原生对话框、桌面层嵌入、窗口置底/区域穿透、 DWM 互操作、图标服务、包标识查询等全部 Windows P/Invoke 实现 - 主工程保留静态工厂门面，调用点不变；DllImport 扫描为零 - 更新 WindowPassthroughServiceTests 指向新位置（20/20 通过）
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lincube
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using System.Runtime.InteropServices;
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using Avalonia.Controls;
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using LanMountainDesktop.Platform.Abstractions;
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namespace LanMountainDesktop.Platform.Windows;
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/// <summary>
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/// Windows 桌面层实现：将窗口设为桌面图标宿主（SHELLDLL_DefView）的子窗口。
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/// 自 LanMountainDesktop.Services.MainWindowDesktopLayerService 迁移，行为不变。
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/// </summary>
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public sealed class WindowsMainWindowDesktopLayerService : IMainWindowDesktopLayerService
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{
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private const int GWL_STYLE = -16;
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private const int GWL_EXSTYLE = -20;
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private const long WS_CHILD = 0x40000000L;
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private const long WS_POPUP = 0x80000000L;
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private const long WS_CAPTION = 0x00C00000L;
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private const long WS_THICKFRAME = 0x00040000L;
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private const long WS_MINIMIZEBOX = 0x00020000L;
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private const long WS_MAXIMIZEBOX = 0x00010000L;
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private const long WS_SYSMENU = 0x00080000L;
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private const uint SWP_NOSIZE = 0x0001;
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private const uint SWP_NOMOVE = 0x0002;
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private const uint SWP_NOACTIVATE = 0x0010;
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private const uint SWP_SHOWWINDOW = 0x0040;
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private const uint SWP_FRAMECHANGED = 0x0020;
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private static readonly IntPtr HWND_TOP = IntPtr.Zero;
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private static readonly IntPtr HWND_BOTTOM = new(1);
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private readonly object _gate = new();
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private readonly Dictionary<IntPtr, WindowRestoreState> _restoreStates = [];
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public bool IsSupported => true;
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public void EnableOrRefresh(Window window)
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{
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ArgumentNullException.ThrowIfNull(window);
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var handle = GetWindowHandle(window);
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if (handle == IntPtr.Zero)
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{
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window.Opened -= OnDeferredOpened;
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window.Opened += OnDeferredOpened;
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return;
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}
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EnableOrRefresh(handle);
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}
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public void Disable(Window window)
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{
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ArgumentNullException.ThrowIfNull(window);
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window.Opened -= OnDeferredOpened;
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var handle = GetWindowHandle(window);
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if (handle == IntPtr.Zero)
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{
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return;
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}
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WindowRestoreState? restoreState;
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lock (_gate)
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{
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if (!_restoreStates.Remove(handle, out restoreState))
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{
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return;
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}
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}
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try
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{
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_ = SetParent(handle, restoreState.Parent);
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SetWindowLongPtr(handle, GWL_STYLE, restoreState.Style);
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SetWindowLongPtr(handle, GWL_EXSTYLE, restoreState.ExStyle);
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_ = SetWindowPos(
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handle,
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HWND_TOP,
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0,
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0,
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0,
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0,
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SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE | SWP_FRAMECHANGED | SWP_SHOWWINDOW);
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PlatformLog.Info("MainWindowDesktopLayer", $"Disabled desktop layer. Window={handle}.");
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}
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catch (Exception ex)
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{
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PlatformLog.Warn("MainWindowDesktopLayer", $"Failed to disable desktop layer. Window={handle}.", ex);
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}
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}
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private void OnDeferredOpened(object? sender, EventArgs e)
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{
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if (sender is not Window window)
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{
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return;
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}
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window.Opened -= OnDeferredOpened;
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EnableOrRefresh(window);
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}
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private void EnableOrRefresh(IntPtr handle)
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{
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if (handle == IntPtr.Zero || !IsWindow(handle))
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{
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return;
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}
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SaveRestoreStateIfNeeded(handle);
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var desktopHost = ResolveDesktopIconHost();
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if (desktopHost != IntPtr.Zero && IsWindow(desktopHost))
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{
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ApplyDesktopChildStyle(handle);
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if (GetParent(handle) != desktopHost)
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{
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_ = SetParent(handle, desktopHost);
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}
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_ = SetWindowPos(
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handle,
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HWND_TOP,
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0,
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0,
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0,
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0,
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SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE | SWP_FRAMECHANGED | SWP_SHOWWINDOW);
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PlatformLog.Info("MainWindowDesktopLayer", $"Enabled desktop layer. Window={handle}; Host={desktopHost}.");
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return;
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}
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_ = SetWindowPos(handle, HWND_BOTTOM, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE | SWP_SHOWWINDOW);
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PlatformLog.Warn("MainWindowDesktopLayer", $"Desktop icon host not found. Falling back to HWND_BOTTOM. Window={handle}.");
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}
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private void SaveRestoreStateIfNeeded(IntPtr handle)
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{
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lock (_gate)
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{
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if (_restoreStates.ContainsKey(handle))
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{
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return;
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}
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_restoreStates[handle] = new WindowRestoreState(
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GetParent(handle),
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GetWindowLongPtr(handle, GWL_STYLE),
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GetWindowLongPtr(handle, GWL_EXSTYLE));
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}
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}
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private static void ApplyDesktopChildStyle(IntPtr handle)
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{
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var style = GetWindowLongPtr(handle, GWL_STYLE).ToInt64();
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style |= WS_CHILD;
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style &= ~(WS_POPUP | WS_CAPTION | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_SYSMENU);
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SetWindowLongPtr(handle, GWL_STYLE, new IntPtr(style));
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}
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private static IntPtr ResolveDesktopIconHost()
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{
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var topLevelWindows = new List<IntPtr>();
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EnumWindows((handle, _) =>
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{
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topLevelWindows.Add(handle);
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return true;
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}, IntPtr.Zero);
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foreach (var topLevelWindow in topLevelWindows)
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{
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var worker = FindWindowEx(topLevelWindow, IntPtr.Zero, "WorkerW", null);
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if (worker == IntPtr.Zero)
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{
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continue;
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}
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var defView = FindWindowEx(worker, IntPtr.Zero, "SHELLDLL_DefView", null);
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if (defView != IntPtr.Zero)
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{
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return defView;
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}
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}
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foreach (var topLevelWindow in topLevelWindows)
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{
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var defView = FindWindowEx(topLevelWindow, IntPtr.Zero, "SHELLDLL_DefView", null);
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if (defView != IntPtr.Zero)
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{
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return defView;
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}
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}
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return IntPtr.Zero;
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}
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private static IntPtr GetWindowHandle(Window window)
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{
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try
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{
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return window.TryGetPlatformHandle()?.Handle ?? IntPtr.Zero;
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}
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catch
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{
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return IntPtr.Zero;
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}
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}
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private sealed record WindowRestoreState(IntPtr Parent, IntPtr Style, IntPtr ExStyle);
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private delegate bool EnumWindowsProc(IntPtr handle, IntPtr lParam);
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[DllImport("user32.dll", EntryPoint = "GetWindowLongPtr")]
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private static extern IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);
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[DllImport("user32.dll", EntryPoint = "SetWindowLongPtr")]
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private static extern IntPtr SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
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[DllImport("user32.dll")]
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private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, uint flags);
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[DllImport("user32.dll", SetLastError = true)]
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private static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
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[DllImport("user32.dll")]
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private static extern IntPtr GetParent(IntPtr hWnd);
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[DllImport("user32.dll")]
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private static extern bool IsWindow(IntPtr hWnd);
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[DllImport("user32.dll", SetLastError = true)]
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private static extern IntPtr FindWindowEx(IntPtr hParent, IntPtr hChildAfter, string? lpszClass, string? lpszWindow);
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[DllImport("user32.dll", SetLastError = true)]
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[return: MarshalAs(UnmanagedType.Bool)]
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private static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);
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}
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