a little simplify

Zhao Yuhang

2023-12-10 b0249aebbacf71eee27e77c766ccb3dc33693b11

 src/core/contexts/win32windowcontext.cpp

@@ -5,7 +5,6 @@

#include <QtCore/QHash>
#include <QtCore/QAbstractNativeEventFilter>
#include <QtCore/QOperatingSystemVersion>
#include <QtCore/QScopeGuard>
#include <QtGui/QGuiApplication>

@@ -23,19 +22,27 @@

#include <shellscalingapi.h>
#include <dwmapi.h>
#include <timeapi.h>
#include <versionhelpers.h>

Q_DECLARE_METATYPE(QMargins)

namespace QWK {

    static constexpr const auto kAutoHideTaskBarThickness =
        quint8{2}; // The thickness of an auto-hide taskbar in pixels.
    // The thickness of an auto-hide taskbar in pixels.
    static constexpr const auto kAutoHideTaskBarThickness = quint8{2};

    using WndProcHash = QHash<HWND, Win32WindowContext *>; // hWnd -> context
    // hWnd -> context
    using WndProcHash = QHash<HWND, Win32WindowContext *>;
    Q_GLOBAL_STATIC(WndProcHash, g_wndProcHash)

    static WNDPROC g_qtWindowProc = nullptr; // Original Qt window proc function
    // Original Qt window proc function
    static WNDPROC g_qtWindowProc = nullptr;

    // ### FIXME FIXME FIXME
    // ### FIXME: Tell the user to call in the documentation, instead of automatically
    // calling it directly.
    // ### FIXME FIXME FIXME
    static struct QWK_Hook {
        QWK_Hook() {
            qApp->setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
@@ -43,27 +50,52 @@
    } g_hook{};

    struct DynamicApis {
        decltype(&::DwmFlush) pDwmFlush = nullptr;
        decltype(&::DwmIsCompositionEnabled) pDwmIsCompositionEnabled = nullptr;
        decltype(&::GetDpiForWindow) pGetDpiForWindow = nullptr;
        decltype(&::GetSystemMetricsForDpi) pGetSystemMetricsForDpi = nullptr;
        decltype(&::GetDpiForMonitor) pGetDpiForMonitor = nullptr;
//        template <typename T>
//        struct DefaultFunc;
//
//        template <typename Return, typename... Args>
//        struct DefaultFunc<Return(QT_WIN_CALLBACK *)(Args...)> {
//            static Return STDAPICALLTYPE func(Args...) {
//                return Return{};
//            }
//        };
//
// #define DYNAMIC_API_DECLARE(NAME) decltype(&::NAME) p##NAME = DefaultFunc<decltype(&::NAME)>::func
#define DYNAMIC_API_DECLARE(NAME) decltype(&::NAME) p##NAME = nullptr

        DYNAMIC_API_DECLARE(DwmFlush);
        DYNAMIC_API_DECLARE(DwmIsCompositionEnabled);
        DYNAMIC_API_DECLARE(DwmGetCompositionTimingInfo);
        DYNAMIC_API_DECLARE(GetDpiForWindow);
        DYNAMIC_API_DECLARE(GetSystemMetricsForDpi);
        DYNAMIC_API_DECLARE(GetDpiForMonitor);
        DYNAMIC_API_DECLARE(timeGetDevCaps);
        DYNAMIC_API_DECLARE(timeBeginPeriod);
        DYNAMIC_API_DECLARE(timeEndPeriod);

#undef DYNAMIC_API_DECLARE

        DynamicApis() {
            QSystemLibrary user32(QStringLiteral("user32.dll"));
            pGetDpiForWindow =
                reinterpret_cast<decltype(pGetDpiForWindow)>(user32.resolve("GetDpiForWindow"));
            pGetSystemMetricsForDpi = reinterpret_cast<decltype(pGetSystemMetricsForDpi)>(
                user32.resolve("GetSystemMetricsForDpi"));
#define DYNAMIC_API_RESOLVE(DLL, NAME) p##NAME = reinterpret_cast<decltype(p##NAME)>(DLL##.resolve(#NAME))

            QSystemLibrary shcore(QStringLiteral("shcore.dll"));
            pGetDpiForMonitor =
                reinterpret_cast<decltype(pGetDpiForMonitor)>(shcore.resolve("GetDpiForMonitor"));
            QSystemLibrary user32(QStringLiteral("user32"));
            DYNAMIC_API_RESOLVE(user32, GetDpiForWindow);
            DYNAMIC_API_RESOLVE(user32, GetSystemMetricsForDpi);

            QSystemLibrary dwmapi(QStringLiteral("dwmapi.dll"));
            pDwmFlush = reinterpret_cast<decltype(pDwmFlush)>(dwmapi.resolve("DwmFlush"));
            pDwmIsCompositionEnabled = reinterpret_cast<decltype(pDwmIsCompositionEnabled)>(
                dwmapi.resolve("DwmIsCompositionEnabled"));
            QSystemLibrary shcore(QStringLiteral("shcore"));
            DYNAMIC_API_RESOLVE(shcore, GetDpiForMonitor);

            QSystemLibrary dwmapi(QStringLiteral("dwmapi"));
            DYNAMIC_API_RESOLVE(dwmapi, DwmFlush);
            DYNAMIC_API_RESOLVE(dwmapi, DwmIsCompositionEnabled);
            DYNAMIC_API_RESOLVE(dwmapi, DwmGetCompositionTimingInfo);

            QSystemLibrary winmm(QStringLiteral("winmm"));
            DYNAMIC_API_RESOLVE(winmm, timeGetDevCaps);
            DYNAMIC_API_RESOLVE(winmm, timeBeginPeriod);
            DYNAMIC_API_RESOLVE(winmm, timeEndPeriod);

#undef DYNAMIC_API_RESOLVE
        }

        ~DynamicApis() = default;
@@ -158,20 +190,22 @@
    }

    static inline bool isWin8OrGreater() {
        static const bool result =
            QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows8;
        static const bool result = ::IsWindows8OrGreater();
        return result;
    }

    static inline bool isWin8Point1OrGreater() {
        static const bool result =
            QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows8_1;
        static const bool result = ::IsWindows8Point1OrGreater();
        return result;
    }

    static inline bool isWin10OrGreater() {
        static const bool result =
            QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows10;
        static const bool result = ::IsWindows10OrGreater();
        return result;
    }

    static inline bool isWin11OrGreater() {
        static const bool result = ::IsWindowsVersionOrGreater(HIBYTE(_WIN32_WINNT_WIN10), LOBYTE(_WIN32_WINNT_WIN10), 22000);
        return result;
    }

@@ -199,8 +233,8 @@
            return apis.pGetDpiForWindow(hwnd);
        } else if (apis.pGetDpiForMonitor) { // Win8.1
            HMONITOR monitor = ::MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
            UINT dpiX{USER_DEFAULT_SCREEN_DPI};
            UINT dpiY{USER_DEFAULT_SCREEN_DPI};
            UINT dpiX{0};
            UINT dpiY{0};
            apis.pGetDpiForMonitor(monitor, MDT_EFFECTIVE_DPI, &dpiX, &dpiY);
            return dpiX;
        } else { // Win2K
@@ -251,7 +285,7 @@
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
        if (QPlatformWindow *platformWindow = window->handle()) {
            if (const auto ni = QGuiApplication::platformNativeInterface()) {
                ni->setWindowProperty(platformWindow, QStringLiteral("_q_windowsCustomMargins"),
                ni->setWindowProperty(platformWindow, QStringLiteral("WindowsCustomMargins"),
                                      marginsVar);
            }
        }
@@ -284,10 +318,6 @@
    }

    static inline bool isFullScreen(HWND hwnd) {
        Q_ASSERT(hwnd);
        if (!hwnd) {
            return false;
        }
        RECT windowRect{};
        ::GetWindowRect(hwnd, &windowRect);
        // Compare to the full area of the screen, not the work area.
@@ -295,10 +325,6 @@
    }

    static inline bool isWindowNoState(HWND hwnd) {
        Q_ASSERT(hwnd);
        if (!hwnd) {
            return false;
        }
#if 0
        WINDOWPLACEMENT wp{};
        wp.length = sizeof(wp);
@@ -310,16 +336,160 @@
#endif
    }

    static inline QPoint fromNativeLocalPosition(const QWindow *window, const QPoint &point) {
        Q_ASSERT(window);
        if (!window) {
            return point;
    static inline void syncPaintEventWithDwm() {
        // No need to sync with DWM if DWM composition is disabled.
        if (!isDwmCompositionEnabled()) {
            return;
        }
#if 1
        return QHighDpi::fromNativeLocalPosition(point, window);
#else
        return QPointF(QPointF(point) / window->devicePixelRatio()).toPoint();
#endif
        const DynamicApis &apis = DynamicApis::instance();
        // Dirty hack to workaround the resize flicker caused by DWM.
        LARGE_INTEGER freq{};
        ::QueryPerformanceFrequency(&freq);
        TIMECAPS tc{};
        apis.ptimeGetDevCaps(&tc, sizeof(tc));
        const UINT ms_granularity = tc.wPeriodMin;
        apis.ptimeBeginPeriod(ms_granularity);
        LARGE_INTEGER now0{};
        ::QueryPerformanceCounter(&now0);
        // ask DWM where the vertical blank falls
        DWM_TIMING_INFO dti{};
        dti.cbSize = sizeof(dti);
        apis.pDwmGetCompositionTimingInfo(nullptr, &dti);
        LARGE_INTEGER now1{};
        ::QueryPerformanceCounter(&now1);
        // - DWM told us about SOME vertical blank
        //   - past or future, possibly many frames away
        // - convert that into the NEXT vertical blank
        const auto period = qreal(dti.qpcRefreshPeriod);
        const auto dt = qreal(dti.qpcVBlank - now1.QuadPart);
        const qreal ratio = (dt / period);
        auto w = qreal(0);
        auto m = qreal(0);
        if ((dt > qreal(0)) || qFuzzyIsNull(dt)) {
            w = ratio;
        } else {
            // reach back to previous period
            // - so m represents consistent position within phase
            w = (ratio - qreal(1));
        }
        m = (dt - (period * w));
        if ((m < qreal(0)) || qFuzzyCompare(m, period) || (m > period)) {
            return;
        }
        const qreal m_ms = (qreal(1000) * m / qreal(freq.QuadPart));
        ::Sleep(static_cast<DWORD>(std::round(m_ms)));
        apis.ptimeEndPeriod(ms_granularity);
    }

    static inline void showSystemMenu2(HWND hWnd, const POINT &pos, const bool selectFirstEntry)
    {
        const HMENU hMenu = ::GetSystemMenu(hWnd, FALSE);
        if (!hMenu) {
            // The corresponding window doesn't have a system menu, most likely due to the
            // lack of the "WS_SYSMENU" window style. This situation should not be treated
            // as an error so just ignore it and return early.
            return;
        }

        // Tweak the menu items according to the current window status and user settings.
        const bool disableClose = /*data->callbacks->getProperty(kSysMenuDisableCloseVar, false).toBool()*/false;
        const bool disableRestore = /*data->callbacks->getProperty(kSysMenuDisableRestoreVar, false).toBool()*/false;
        const bool disableMinimize = /*data->callbacks->getProperty(kSysMenuDisableMinimizeVar, false).toBool()*/false;
        const bool disableMaximize = /*data->callbacks->getProperty(kSysMenuDisableMaximizeVar, false).toBool()*/false;
        const bool disableSize = /*data->callbacks->getProperty(kSysMenuDisableSizeVar, false).toBool()*/false;
        const bool disableMove = /*data->callbacks->getProperty(kSysMenuDisableMoveVar, false).toBool()*/false;
        const bool removeClose = /*data->callbacks->getProperty(kSysMenuRemoveCloseVar, false).toBool()*/false;
        const bool removeSeparator = /*data->callbacks->getProperty(kSysMenuRemoveSeparatorVar, false).toBool()*/false;
        const bool removeRestore = /*data->callbacks->getProperty(kSysMenuRemoveRestoreVar, false).toBool()*/false;
        const bool removeMinimize = /*data->callbacks->getProperty(kSysMenuRemoveMinimizeVar, false).toBool()*/false;
        const bool removeMaximize = /*data->callbacks->getProperty(kSysMenuRemoveMaximizeVar, false).toBool()*/false;
        const bool removeSize = /*data->callbacks->getProperty(kSysMenuRemoveSizeVar, false).toBool()*/false;
        const bool removeMove = /*data->callbacks->getProperty(kSysMenuRemoveMoveVar, false).toBool()*/false;
        const bool maxOrFull = IsMaximized(hWnd) || isFullScreen(hWnd);
        const bool fixedSize = /*data->callbacks->isWindowFixedSize()*/false;
        if (removeClose) {
            ::DeleteMenu(hMenu, SC_CLOSE, MF_BYCOMMAND);
        } else {
            ::EnableMenuItem(hMenu, SC_CLOSE, (MF_BYCOMMAND | (disableClose ? MFS_DISABLED : MFS_ENABLED)));
        }
        if (removeSeparator) {
            // Looks like we must use 0 for the second parameter here, otherwise we can't remove the separator.
            ::DeleteMenu(hMenu, 0, MFT_SEPARATOR);
        }
        if (removeMaximize) {
            ::DeleteMenu(hMenu, SC_MAXIMIZE, MF_BYCOMMAND);
        } else {
            ::EnableMenuItem(hMenu, SC_MAXIMIZE, (MF_BYCOMMAND | ((maxOrFull || fixedSize || disableMaximize) ? MFS_DISABLED : MFS_ENABLED)));
        }
        if (removeRestore) {
            ::DeleteMenu(hMenu, SC_RESTORE, MF_BYCOMMAND);
        } else {
            ::EnableMenuItem(hMenu, SC_RESTORE, (MF_BYCOMMAND | ((maxOrFull && !fixedSize && !disableRestore) ? MFS_ENABLED : MFS_DISABLED)));
            // The first menu item should be selected by default if the menu is brought
            // up by keyboard. I don't know how to pre-select a menu item but it seems
            // highlight can do the job. However, there's an annoying issue if we do
            // this manually: the highlighted menu item is really only highlighted,
            // not selected, so even if the mouse cursor hovers on other menu items
            // or the user navigates to other menu items through keyboard, the original
            // highlight bar will not move accordingly, the OS will generate another
            // highlight bar to indicate the current selected menu item, which will make
            // the menu look kind of weird. Currently I don't know how to fix this issue.
            ::HiliteMenuItem(hWnd, hMenu, SC_RESTORE, (MF_BYCOMMAND | (selectFirstEntry ? MFS_HILITE : MFS_UNHILITE)));
        }
        if (removeMinimize) {
            ::DeleteMenu(hMenu, SC_MINIMIZE, MF_BYCOMMAND);
        } else {
            ::EnableMenuItem(hMenu, SC_MINIMIZE, (MF_BYCOMMAND | (disableMinimize ? MFS_DISABLED : MFS_ENABLED)));
        }
        if (removeSize) {
            ::DeleteMenu(hMenu, SC_SIZE, MF_BYCOMMAND);
        } else {
            ::EnableMenuItem(hMenu, SC_SIZE, (MF_BYCOMMAND | ((maxOrFull || fixedSize || disableSize || disableMinimize || disableMaximize) ? MFS_DISABLED : MFS_ENABLED)));
        }
        if (removeMove) {
            ::DeleteMenu(hMenu, SC_MOVE, MF_BYCOMMAND);
        } else {
            ::EnableMenuItem(hMenu, SC_MOVE, (MF_BYCOMMAND | ((maxOrFull || disableMove) ? MFS_DISABLED : MFS_ENABLED)));
        }

        // The default menu item will appear in bold font. There can only be one default
        // menu item per menu at most. Set the item ID to "UINT_MAX" (or simply "-1")
        // can clear the default item for the given menu.
        std::optional<UINT> defaultItemId = std::nullopt;
        if (isWin11OrGreater()) {
            if (maxOrFull) {
                if (!removeRestore) {
                    defaultItemId = SC_RESTORE;
                }
            } else {
                if (!removeMaximize) {
                    defaultItemId = SC_MAXIMIZE;
                }
            }
        }
        if (!(defaultItemId.has_value() || removeClose)) {
            defaultItemId = SC_CLOSE;
        }
        ::SetMenuDefaultItem(hMenu, defaultItemId.value_or(UINT_MAX), FALSE);

        //::DrawMenuBar(hWnd);

        // Popup the system menu at the required position.
        const auto result = ::TrackPopupMenu(hMenu, (TPM_RETURNCMD | (QGuiApplication::isRightToLeft() ? TPM_RIGHTALIGN : TPM_LEFTALIGN)), pos.x, pos.y, 0, hWnd, nullptr);

        if (!removeRestore) {
            // Unhighlight the first menu item after the popup menu is closed, otherwise it will keep
            // highlighting until we unhighlight it manually.
            ::HiliteMenuItem(hWnd, hMenu, SC_RESTORE, (MF_BYCOMMAND | MFS_UNHILITE));
        }

        if (!result) {
            // The user canceled the menu, no need to continue.
            return;
        }

        // Send the command that the user chooses to the corresponding window.
        ::PostMessageW(hWnd, WM_SYSCOMMAND, result, 0);
    }

    static inline Win32WindowContext::WindowPart getHitWindowPart(int hitTestResult) {
@@ -396,9 +566,6 @@
                               QT_NATIVE_EVENT_RESULT_TYPE *result) override {
            Q_UNUSED(eventType)

            auto orgLastMessageContext = lastMessageContext;
            lastMessageContext = nullptr;

            // It has been observed that the pointer that Qt gives us is sometimes null on some
            // machines. We need to guard against it in such scenarios.
            if (!result) {
@@ -407,11 +574,11 @@

            // https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/plugins/platforms/windows/qwindowscontext.cpp#L1546
            // Qt needs to refer to the WM_NCCALCSIZE message data that hasn't been processed, so we
            // have to process it after Qt acquired the initial data.
            auto msg = reinterpret_cast<const MSG *>(message);
            if (msg->message == WM_NCCALCSIZE && orgLastMessageContext) {
            // have to process it after Qt acquires the initial data.
            auto msg = static_cast<const MSG *>(message);
            if (msg->message == WM_NCCALCSIZE && lastMessageContext) {
                LRESULT res;
                if (Win32WindowContext::nonClientCalcSizeHandler(msg->hwnd, msg->message,
                if (lastMessageContext->nonClientCalcSizeHandler(msg->hwnd, msg->message,
                                                                 msg->wParam, msg->lParam, &res)) {
                    *result = decltype(*result)(res);
                    return true;
@@ -424,11 +591,17 @@
        static Win32WindowContext *lastMessageContext;

        static inline void install() {
            if (instance) {
                return;
            }
            instance = new WindowsNativeEventFilter();
            installNativeEventFilter(instance);
        }

        static inline void uninstall() {
            if (!instance) {
                return;
            }
            removeNativeEventFilter(instance);
            delete instance;
            instance = nullptr;
@@ -507,22 +680,18 @@
        // forward it right away and process it in our native event filter.
        if (message == WM_NCCALCSIZE) {
            WindowsNativeEventFilter::lastMessageContext = ctx;
            return ::CallWindowProcW(g_qtWindowProc, hWnd, message, wParam, lParam);
            LRESULT result = ::CallWindowProcW(g_qtWindowProc, hWnd, message, wParam, lParam);
            WindowsNativeEventFilter::lastMessageContext = nullptr;
            return result;
        }

        // Try hooked procedure and save result
        LRESULT result;
        bool handled = ctx->windowProc(hWnd, message, wParam, lParam, &result);

        // TODO: Determine whether to show system menu
        // ...

        if (handled) {
        if (ctx->windowProc(hWnd, message, wParam, lParam, &result)) {
            return result;
        }

        // Continue dispatching.
        WindowsNativeEventFilter::lastMessageContext = ctx;
        return ::CallWindowProcW(g_qtWindowProc, hWnd, message, wParam, lParam);
    }

@@ -558,9 +727,7 @@
        ::SetWindowLongPtrW(hWnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(QWKHookedWndProc));

        // Install global native event filter
        if (!WindowsNativeEventFilter::instance) {
            WindowsNativeEventFilter::install();
        }
        WindowsNativeEventFilter::install();

        // Cache window ID
        windowId = winId;
@@ -600,6 +767,10 @@

        // Main implementation
        if (customWindowHandler(hWnd, message, wParam, lParam, result)) {
            return true;
        }

        if (systemMenuHandler(hWnd, message, wParam, lParam, result)) {
            return true;
        }

@@ -762,8 +933,8 @@
                    DWORD dwScreenPos = ::GetMessagePos();
                    POINT screenPoint{GET_X_LPARAM(dwScreenPos), GET_Y_LPARAM(dwScreenPos)};
                    ::ScreenToClient(hWnd, &screenPoint);
                    QPoint qtScenePos =
                        fromNativeLocalPosition(m_windowHandle, {screenPoint.x, screenPoint.y});
                    QPoint qtScenePos = QHighDpi::fromNativeLocalPosition(
                        QPoint{screenPoint.x, screenPoint.y}, m_windowHandle);
                    auto dummy = CoreWindowAgent::Unknown;
                    if (isInSystemButtons(qtScenePos, &dummy)) {
                        // We must record whether the last WM_MOUSELEAVE was filtered, because if
@@ -811,7 +982,7 @@
                const WindowPart currentWindowPart = lastHitTestResult;
                if (message == WM_NCMOUSEMOVE) {
                    if (currentWindowPart != WindowPart::ChromeButton) {
                        std::ignore = m_delegate->resetQtGrabbedControl();
                        m_delegate->resetQtGrabbedControl();
                        if (mouseLeaveBlocked) {
                            emulateClientAreaMessage(hWnd, message, wParam, lParam,
                                                     WM_NCMOUSELEAVE);
@@ -873,7 +1044,7 @@
                        // window from client area, which means we will get previous window part as
                        // HTCLIENT if the mouse leaves window from client area and enters window
                        // from non-client area, but it has no bad effect.
                        std::ignore = m_delegate->resetQtGrabbedControl();
                        m_delegate->resetQtGrabbedControl();
                    }
                }
                break;
@@ -995,8 +1166,8 @@
                auto clientWidth = RECT_WIDTH(clientRect);
                auto clientHeight = RECT_HEIGHT(clientRect);

                QPoint qtScenePos = fromNativeLocalPosition(
                    m_windowHandle, QPoint(nativeLocalPos.x, nativeLocalPos.y));
                QPoint qtScenePos = QHighDpi::fromNativeLocalPosition(
                    QPoint(nativeLocalPos.x, nativeLocalPos.y), m_windowHandle);

                bool isFixedSize = m_delegate->isHostSizeFixed(m_host);
                bool isTitleBar = isInTitleBarDraggableArea(qtScenePos);
@@ -1012,22 +1183,31 @@
                    // this is also the normal behavior of a native Win32 window (but only when the
                    // window is not maximized/fullscreen/minimized, of course).
                    if (isWindowNoState(hWnd)) {
                        static constexpr const int kBorderSize = 2;
                        static constexpr const auto kBorderSize = quint8{2};
                        bool isTop = (nativeLocalPos.y <= kBorderSize);
                        bool isLeft = nativeLocalPos.x <= kBorderSize;
                        bool isRight = (nativeLocalPos.x >= (clientWidth - kBorderSize));
                        if (isTop || isRight) {
                        if (isTop || isLeft || isRight) {
                            if (dontOverrideCursor) {
                                // The user doesn't want the window to be resized, so we tell
                                // Windows we are in the client area so that the controls beneath
                                // the mouse cursor can still be hovered or clicked.
                                *result = (isTitleBar ? HTCAPTION : HTCLIENT);
                            } else {
                                if (isTop && isRight) {
                                    *result = HTTOPRIGHT;
                                } else if (isTop) {
                                    *result = HTTOP;
                                if (isTop) {
                                    if (isLeft) {
                                        *result = HTTOPLEFT;
                                    } else if (isRight) {
                                        *result = HTTOPRIGHT;
                                    } else {
                                        *result = HTTOP;
                                    }
                                } else {
                                    *result = HTRIGHT;
                                    if (isLeft) {
                                        *result = HTLEFT;
                                    } else {
                                        *result = HTRIGHT;
                                    }
                                }
                            }
                        }
@@ -1127,9 +1307,9 @@
                        const bool isBottom = (nativeLocalPos.y >= (clientHeight - frameSize));
                        // Make the border a little wider to let the user easy to resize on corners.
                        const auto scaleFactor = ((isTop || isBottom) ? qreal(2) : qreal(1));
                        const int scaledFrameSizeX = std::round(qreal(frameSize) * scaleFactor);
                        const bool isLeft = (nativeLocalPos.x < scaledFrameSizeX);
                        const bool isRight = (nativeLocalPos.x >= (clientWidth - scaledFrameSizeX));
                        const int scaledFrameSize = std::round(qreal(frameSize) * scaleFactor);
                        const bool isLeft = (nativeLocalPos.x < scaledFrameSize);
                        const bool isRight = (nativeLocalPos.x >= (clientWidth - scaledFrameSize));
                        if (dontOverrideCursor && (isTop || isBottom || isLeft || isRight)) {
                            // Return HTCLIENT instead of HTBORDER here, because the mouse is
                            // inside the window now, return HTCLIENT to let the controls
@@ -1247,6 +1427,7 @@
    bool Win32WindowContext::nonClientCalcSizeHandler(HWND hWnd, UINT message, WPARAM wParam,
                                                      LPARAM lParam, LRESULT *result) {
        Q_UNUSED(message)
        Q_UNUSED(this)

        // Windows是根据这个消息的返回值来设置窗口的客户区（窗口中真正显示的内容）
        // 和非客户区（标题栏、窗口边框、菜单栏和状态栏等Windows系统自行提供的部分
@@ -1455,8 +1636,9 @@
                }
            }
        }
        // ### TODO: std::ignore = Utils::syncWmPaintWithDwm(); // This should be executed
        // at the very last. By returning WVR_REDRAW we can make the window resizing look
        // We should call this function only before the function returns.
        syncPaintEventWithDwm();
        // By returning WVR_REDRAW we can make the window resizing look
        // less broken. But we must return 0 if wParam is FALSE, according to Microsoft
        // Docs.
        // **IMPORTANT NOTE**:
@@ -1470,4 +1652,89 @@
        return true;
    }

    bool Win32WindowContext::systemMenuHandler(HWND hWnd, UINT message, WPARAM wParam,
                                               LPARAM lParam, LRESULT *result) {
        const auto getNativePosFromMouse = [lParam]() -> POINT {
            return {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
        };
        const auto getNativeGlobalPosFromKeyboard = [hWnd]() -> POINT {
            const bool maxOrFull = IsMaximized(hWnd) || isFullScreen(hWnd);
            const quint32 frameSize = getResizeBorderThickness(hWnd);
            const quint32 horizontalOffset = ((maxOrFull || !isWin10OrGreater()) ? 0 : frameSize);
            const auto verticalOffset = [hWnd, maxOrFull, frameSize]() -> quint32 {
                const quint32 titleBarHeight = getTitleBarHeight(hWnd);
                if (!isWin10OrGreater()) {
                    return titleBarHeight;
                }
                if (isWin11OrGreater()) {
                    if (maxOrFull) {
                        return (titleBarHeight + frameSize);
                    }
                    return titleBarHeight;
                }
                if (maxOrFull) {
                    return titleBarHeight;
                }
                return titleBarHeight - frameSize;
            }();
            RECT windowPos{};
            ::GetWindowRect(hWnd, &windowPos);
            return {static_cast<LONG>(windowPos.left + horizontalOffset), static_cast<LONG>(windowPos.top + verticalOffset)};
        };
        bool shouldShowSystemMenu = false;
        bool broughtByKeyboard = false;
        POINT nativeGlobalPos{};
        switch (message) {
            case WM_RBUTTONUP: {
                const POINT nativeLocalPos = getNativePosFromMouse();
                const QPoint qtScenePos = QHighDpi::fromNativeLocalPosition(QPoint(nativeLocalPos.x, nativeLocalPos.y), m_windowHandle);
                if (isInTitleBarDraggableArea(qtScenePos)) {
                    shouldShowSystemMenu = true;
                    nativeGlobalPos = nativeLocalPos;
                    ::ClientToScreen(hWnd, &nativeGlobalPos);
                }
                break;
            }
            case WM_NCRBUTTONUP: {
                if (wParam == HTCAPTION) {
                    shouldShowSystemMenu = true;
                    nativeGlobalPos = getNativePosFromMouse();
                }
                break;
            }
            case WM_SYSCOMMAND: {
                const WPARAM filteredWParam = (wParam & 0xFFF0);
                if ((filteredWParam == SC_KEYMENU) && (lParam == VK_SPACE)) {
                    shouldShowSystemMenu = true;
                    broughtByKeyboard = true;
                    nativeGlobalPos = getNativeGlobalPosFromKeyboard();
                }
                break;
            }
            case WM_KEYDOWN:
            case WM_SYSKEYDOWN: {
                const bool altPressed = ((wParam == VK_MENU) || (::GetKeyState(VK_MENU) < 0));
                const bool spacePressed = ((wParam == VK_SPACE) || (::GetKeyState(VK_SPACE) < 0));
                if (altPressed && spacePressed) {
                    shouldShowSystemMenu = true;
                    broughtByKeyboard = true;
                    nativeGlobalPos = getNativeGlobalPosFromKeyboard();
                }
                break;
            }
            default:
                break;
        }
        if (shouldShowSystemMenu) {
            showSystemMenu2(hWnd, nativeGlobalPos, broughtByKeyboard);
            // QPA's internal code will handle system menu events separately, and its
            // behavior is not what we would want to see because it doesn't know our
            // window doesn't have any window frame now, so return early here to avoid
            // entering Qt's own handling logic.
            *result = FALSE;
            return true;
        }
        return false;
    }

}