sola/qwindowkit.git

			@@ -1,14 +1,21 @@
			// Copyright (C) 2023-2024 Stdware Collections (https://www.github.com/stdware)
			// Copyright (C) 2021-2023 wangwenx190 (Yuhang Zhao)
			// SPDX-License-Identifier: Apache-2.0

			#include "win32windowcontext_p.h"

			#include <optional>

			#include <QtCore/QAbstractEventDispatcher>
			#include <QtCore/QDateTime>
			#include <QtCore/QHash>
			#include <QtCore/QScopeGuard>
			#include <QtCore/QTimer>
			#include <QtGui/QGuiApplication>
			#include <QtGui/QPainter>
			#include <QtGui/QPalette>
			#include <QtGui/QStyleHints>

			#include <QtGui/qpa/qwindowsysteminterface.h>

			#include <QtGui/private/qhighdpiscaling_p.h>
			#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
			@@ -21,14 +28,30 @@
			# include <QtGui/qpa/qplatformwindow_p.h>
			#endif

			#include <QWKCore/qwkconfig.h>

			#include "qwkglobal_p.h"
			#include "qwkwindowsextra_p.h"

			#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
			Q_DECLARE_METATYPE(QMargins)
			#if (QT_VERSION >= QT_VERSION_CHECK(6, 6, 0)) && (QT_VERSION <= QT_VERSION_CHECK(6, 6, 1))
			# error Current Qt version has a critical bug which will break QWK functionality. Please upgrade to > 6.6.1 or downgrade to < 6.6.0
			#endif

			#ifndef DWM_BB_ENABLE
			# define DWM_BB_ENABLE 0x00000001
			#endif

			#ifndef ABM_GETAUTOHIDEBAREX
			# define ABM_GETAUTOHIDEBAREX 0x0000000b
			#endif

			namespace QWK {

			enum IconButtonClickLevelFlag {
			IconButtonClicked = 1,
			IconButtonDoubleClicked = 2,
			IconButtonTriggersClose = 4,
			};

			// The thickness of an auto-hide taskbar in pixels.
			static constexpr const quint8 kAutoHideTaskBarThickness = 2;
			@@ -47,63 +70,34 @@
			// Original Qt window proc function
			static WNDPROC g_qtWindowProc = nullptr;

			static inline bool
			#if !QWINDOWKIT_CONFIG(ENABLE_WINDOWS_SYSTEM_BORDERS)
			constexpr
			#endif

			isSystemBorderEnabled() {
			return
			#if QWINDOWKIT_CONFIG(ENABLE_WINDOWS_SYSTEM_BORDERS)
			isWin10OrGreater()
			#else
			false
			#endif
			;
			}

			static inline void triggerFrameChange(HWND hwnd) {
			::SetWindowPos(hwnd, nullptr, 0, 0, 0, 0,
			SWP_NOACTIVATE \| SWP_NOMOVE \| SWP_NOSIZE \| SWP_NOZORDER \| SWP_NOOWNERZORDER \|
			SWP_FRAMECHANGED);
			}

			static inline quint32 getDpiForWindow(HWND hwnd) {
			const DynamicApis &apis = DynamicApis::instance();
			if (apis.pGetDpiForWindow) { // Win10
			return apis.pGetDpiForWindow(hwnd);
			} else if (apis.pGetDpiForMonitor) { // Win8.1
			HMONITOR monitor = ::MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
			UINT dpiX{0};
			UINT dpiY{0};
			apis.pGetDpiForMonitor(monitor, MDT_EFFECTIVE_DPI, &dpiX, &dpiY);
			return dpiX;
			} else { // Win2K
			HDC hdc = ::GetDC(nullptr);
			const int dpiX = ::GetDeviceCaps(hdc, LOGPIXELSX);
			// const int dpiY = ::GetDeviceCaps(hdc, LOGPIXELSY);
			::ReleaseDC(nullptr, hdc);
			return quint32(dpiX);
			}
			}

			static inline quint32 getSystemMetricsForDpi(int index, quint32 dpi) {
			const DynamicApis &apis = DynamicApis::instance();
			if (apis.pGetSystemMetricsForDpi) {
			return ::GetSystemMetricsForDpi(index, dpi);
			}
			return ::GetSystemMetrics(index);
			}

			static inline quint32 getWindowFrameBorderThickness(HWND hwnd) {
			const DynamicApis &apis = DynamicApis::instance();
			if (UINT result = 0; SUCCEEDED(apis.pDwmGetWindowAttribute(
			hwnd, _DWMWA_VISIBLE_FRAME_BORDER_THICKNESS, &result, sizeof(result)))) {
			return result;
			}
			return getSystemMetricsForDpi(SM_CXBORDER, getDpiForWindow(hwnd));
			}

			static inline quint32 getResizeBorderThickness(HWND hwnd) {
			const quint32 dpi = getDpiForWindow(hwnd);
			return getSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) +
			getSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi);
			}

			static inline quint32 getTitleBarHeight(HWND hwnd) {
			const quint32 dpi = getDpiForWindow(hwnd);
			return getSystemMetricsForDpi(SM_CYCAPTION, dpi) +
			getSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) +
			getSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi);
			}

			static void setInternalWindowFrameMargins(QWindow *window, const QMargins &margins) {
			const QVariant marginsVar = QVariant::fromValue(margins);

			// We need to tell Qt we have set a custom margin, because we are hiding
			// the title bar by pretending the whole window is filled by client area,
			// this however confuses Qt's internal logic. We need to do the following
			// hack to let Qt consider the extra margin when changing window geometry.
			window->setProperty("_q_windowsCustomMargins", marginsVar);
			#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
			if (QPlatformWindow *platformWindow = window->handle()) {
			@@ -130,18 +124,6 @@
			return monitorInfo;
			}

			static inline void moveWindowToDesktopCenter(HWND hwnd) {
			MONITORINFOEXW monitorInfo = getMonitorForWindow(hwnd);
			RECT windowRect{};
			::GetWindowRect(hwnd, &windowRect);
			const auto newX = monitorInfo.rcMonitor.left +
			(RECT_WIDTH(monitorInfo.rcMonitor) - RECT_WIDTH(windowRect)) / 2;
			const auto newY = monitorInfo.rcMonitor.top +
			(RECT_HEIGHT(monitorInfo.rcMonitor) - RECT_HEIGHT(windowRect)) / 2;
			::SetWindowPos(hwnd, nullptr, newX, newY, 0, 0,
			SWP_NOACTIVATE \| SWP_NOSIZE \| SWP_NOZORDER \| SWP_NOOWNERZORDER);
			}

			static inline void moveWindowToMonitor(HWND hwnd, const MONITORINFOEXW &activeMonitor) {
			RECT currentMonitorRect = getMonitorForWindow(hwnd).rcMonitor;
			RECT activeMonitorRect = activeMonitor.rcMonitor;
			@@ -159,6 +141,36 @@
			SWP_NOACTIVATE \| SWP_NOSIZE \| SWP_NOZORDER \| SWP_NOOWNERZORDER);
			}

			static inline bool isFullScreen(HWND hwnd) {
			RECT windowRect{};
			::GetWindowRect(hwnd, &windowRect);
			// Compare to the full area of the screen, not the work area.
			return (windowRect == getMonitorForWindow(hwnd).rcMonitor);
			}

			static inline bool isMaximized(HWND hwnd) {
			return ::IsZoomed(hwnd);
			}

			static inline bool isMinimized(HWND hwnd) {
			return ::IsIconic(hwnd);
			}

			static inline bool isWindowNoState(HWND hwnd) {
			#if 0
			WINDOWPLACEMENT wp{};
			wp.length = sizeof(wp);
			::GetWindowPlacement(hwnd, &wp);
			return ((wp.showCmd == SW_NORMAL) \|\| (wp.showCmd == SW_RESTORE));
			#else
			if (isFullScreen(hwnd)) {
			return false;
			}
			const auto style = static_cast<DWORD>(::GetWindowLongPtrW(hwnd, GWL_STYLE));
			return (!(style & (WS_MINIMIZE \| WS_MAXIMIZE)));
			#endif
			}

			static inline void bringWindowToFront(HWND hwnd) {
			HWND oldForegroundWindow = ::GetForegroundWindow();
			if (!oldForegroundWindow) {
			@@ -170,7 +182,7 @@
			if (!::IsWindowVisible(hwnd)) {
			::ShowWindow(hwnd, SW_SHOW);
			}
			if (IsMinimized(hwnd)) {
			if (isMinimized(hwnd)) {
			// Restore the window if it is minimized.
			::ShowWindow(hwnd, SW_RESTORE);
			// Once we've been restored, throw us on the active monitor.
			@@ -196,7 +208,7 @@

			[[maybe_unused]] const auto &cleaner =
			qScopeGuard([windowThreadProcessId, currentThreadId]() {
			::AttachThreadInput(windowThreadProcessId, currentThreadId, FALSE); //
			::AttachThreadInput(windowThreadProcessId, currentThreadId, FALSE);
			});

			::BringWindowToTop(hwnd);
			@@ -207,89 +219,31 @@
			moveWindowToMonitor(hwnd, activeMonitor);
			}

			static inline bool isFullScreen(HWND hwnd) {
			RECT windowRect{};
			::GetWindowRect(hwnd, &windowRect);
			// Compare to the full area of the screen, not the work area.
			return (windowRect == getMonitorForWindow(hwnd).rcMonitor);
			}

			static inline bool isWindowNoState(HWND hwnd) {
			#if 0
			WINDOWPLACEMENT wp{};
			wp.length = sizeof(wp);
			::GetWindowPlacement(hwnd, &wp);
			return ((wp.showCmd == SW_NORMAL) \|\| (wp.showCmd == SW_RESTORE));
			#else
			if (isFullScreen(hwnd)) {
			return false;
			}
			const auto style = static_cast<DWORD>(::GetWindowLongPtrW(hwnd, GWL_STYLE));
			return (!(style & (WS_MINIMIZE \| WS_MAXIMIZE)));
			#endif
			}

			static void syncPaintEventWithDwm() {
			// No need to sync with DWM if DWM composition is disabled.
			if (!isDwmCompositionEnabled()) {
			return;
			}
			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 void showSystemMenu2(HWND hWnd, const POINT &pos, const bool selectFirstEntry,
			const bool fixedSize) {
			// Returns false if the menu is canceled
			static bool showSystemMenu_sys(HWND hWnd, const POINT &pos, const bool selectFirstEntry,
			const bool fixedSize) {
			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;
			return true;
			}

			const bool maxOrFull = IsMaximized(hWnd) \|\| isFullScreen(hWnd);
			const auto windowStyles = ::GetWindowLongPtrW(hWnd, GWL_STYLE);
			const bool allowMaximize = windowStyles & WS_MAXIMIZEBOX;
			const bool allowMinimize = windowStyles & WS_MINIMIZEBOX;

			const bool maxOrFull = isMaximized(hWnd) \|\| isFullScreen(hWnd);
			::EnableMenuItem(hMenu, SC_CLOSE, (MF_BYCOMMAND \| MFS_ENABLED));
			::EnableMenuItem(hMenu, SC_MAXIMIZE,
			(MF_BYCOMMAND \| ((maxOrFull \|\| fixedSize) ? MFS_DISABLED : MFS_ENABLED)));
			::EnableMenuItem(hMenu, SC_RESTORE,
			(MF_BYCOMMAND \| ((maxOrFull && !fixedSize) ? MFS_ENABLED : MFS_DISABLED)));
			::EnableMenuItem(
			hMenu, SC_MAXIMIZE,
			(MF_BYCOMMAND \|
			((maxOrFull \|\| fixedSize \|\| !allowMaximize) ? MFS_DISABLED : MFS_ENABLED)));
			::EnableMenuItem(
			hMenu, SC_RESTORE,
			(MF_BYCOMMAND \|
			((maxOrFull && !fixedSize && allowMaximize) ? 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
			@@ -301,7 +255,8 @@
			// 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)));
			::EnableMenuItem(hMenu, SC_MINIMIZE, (MF_BYCOMMAND \| MFS_ENABLED));
			::EnableMenuItem(hMenu, SC_MINIMIZE,
			(MF_BYCOMMAND \| (allowMinimize ? MFS_ENABLED : MFS_DISABLED)));
			::EnableMenuItem(hMenu, SC_SIZE,
			(MF_BYCOMMAND \| ((maxOrFull \|\| fixedSize) ? MFS_DISABLED : MFS_ENABLED)));
			::EnableMenuItem(hMenu, SC_MOVE, (MF_BYCOMMAND \| (maxOrFull ? MFS_DISABLED : MFS_ENABLED)));
			@@ -325,7 +280,8 @@
			// Popup the system menu at the required position.
			const auto result = ::TrackPopupMenu(
			hMenu,
			(TPM_RETURNCMD \| (QGuiApplication::isRightToLeft() ? TPM_RIGHTALIGN : TPM_LEFTALIGN)),
			(TPM_RETURNCMD \| (QGuiApplication::isRightToLeft() ? TPM_RIGHTALIGN : TPM_LEFTALIGN) \|
			TPM_RIGHTBUTTON),
			pos.x, pos.y, 0, hWnd, nullptr);

			// Unhighlight the first menu item after the popup menu is closed, otherwise it will keep
			@@ -334,11 +290,12 @@

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

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

			static inline Win32WindowContext::WindowPart getHitWindowPart(int hitTestResult) {
			@@ -365,7 +322,6 @@
			case HTBORDER:
			return Win32WindowContext::FixedBorder;
			default:
			// unreachable
			break;
			}
			return Win32WindowContext::Outside;
			@@ -403,6 +359,109 @@
			return true;
			}

			static inline constexpr bool isNonClientMessage(const UINT message) {
			if (((message >= WM_NCCREATE) && (message <= WM_NCACTIVATE)) \|\|
			((message >= WM_NCMOUSEMOVE) && (message <= WM_NCMBUTTONDBLCLK)) \|\|
			((message >= WM_NCXBUTTONDOWN) && (message <= WM_NCXBUTTONDBLCLK))
			#if (WINVER >= _WIN32_WINNT_WIN8)
			\|\| ((message >= WM_NCPOINTERUPDATE) && (message <= WM_NCPOINTERUP))
			#endif
			\|\| ((message == WM_NCMOUSEHOVER) \|\| (message == WM_NCMOUSELEAVE))) {
			return true;
			} else {
			return false;
			}
			}

			static MSG createMessageBlock(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
			MSG msg;
			msg.hwnd = hWnd;
			msg.message = message;
			msg.wParam = wParam;
			msg.lParam = lParam;

			const DWORD dwScreenPos = ::GetMessagePos();
			msg.pt.x = GET_X_LPARAM(dwScreenPos);
			msg.pt.y = GET_Y_LPARAM(dwScreenPos);
			if (!isNonClientMessage(message)) {
			::ScreenToClient(hWnd, &msg.pt);
			}

			msg.time = ::GetMessageTime();
			return msg;
			}

			static inline constexpr bool isInputMessage(UINT m) {
			switch (m) {
			case WM_IME_STARTCOMPOSITION:
			case WM_IME_ENDCOMPOSITION:
			case WM_IME_COMPOSITION:
			case WM_INPUT:
			case WM_TOUCH:
			case WM_MOUSEHOVER:
			case WM_MOUSELEAVE:
			case WM_NCMOUSEHOVER:
			case WM_NCMOUSELEAVE:
			case WM_SIZING:
			case WM_MOVING:
			case WM_SYSCOMMAND:
			case WM_COMMAND:
			case WM_DWMNCRENDERINGCHANGED:
			case WM_PAINT:
			return true;
			default:
			break;
			}
			return (m >= WM_MOUSEFIRST && m <= WM_MOUSELAST) \|\|
			(m >= WM_NCMOUSEMOVE && m <= WM_NCXBUTTONDBLCLK) \|\|
			(m >= WM_KEYFIRST && m <= WM_KEYLAST);
			}

			static inline QByteArray nativeEventType() {
			return QByteArrayLiteral("windows_generic_MSG");
			}

			// Send to QAbstractEventDispatcher
			static bool filterNativeEvent(MSG msg, LRESULT result) {
			auto dispatcher = QAbstractEventDispatcher::instance();
			QT_NATIVE_EVENT_RESULT_TYPE filterResult = *result;
			if (dispatcher && dispatcher->filterNativeEvent(nativeEventType(), msg, &filterResult)) {
			*result = LRESULT(filterResult);
			return true;
			}
			return false;
			}

			// Send to QWindowSystemInterface
			static bool filterNativeEvent(QWindow window, MSG msg, LRESULT *result) {
			QT_NATIVE_EVENT_RESULT_TYPE filterResult = *result;
			if (QWindowSystemInterface::handleNativeEvent(window, nativeEventType(), msg,
			&filterResult)) {
			*result = LRESULT(filterResult);
			return true;
			}
			return false;
			}

			static inline bool forwardFilteredEvent(QWindow *window, HWND hWnd, UINT message, WPARAM wParam,
			LPARAM lParam, LRESULT *result) {
			MSG msg = createMessageBlock(hWnd, message, wParam, lParam);

			// https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/plugins/platforms/windows/qwindowscontext.cpp#L1025
			// Do exact the same as what Qt Windows plugin does.

			// Run the native event filters. QTBUG-67095: Exclude input messages which are sent
			// by QEventDispatcherWin32::processEvents()
			if (!isInputMessage(msg.message) && filterNativeEvent(&msg, result))
			return true;

			auto platformWindow = window->handle();
			if (platformWindow && filterNativeEvent(platformWindow->window(), &msg, result))
			return true;

			return false;
			}

			// https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/plugins/platforms/windows/qwindowscontext.cpp#L1556
			// In QWindowsContext::windowsProc(), the messages will be passed to all global native event
			// filters, but because we have already filtered the messages in the hook WndProc function for
			@@ -422,23 +481,44 @@
			return false;
			}

			// 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 acquires the initial data.
			auto msg = static_cast<const MSG *>(message);
			if (msg->message == WM_NCCALCSIZE && lastMessageContext) {
			LRESULT res;
			if (lastMessageContext->nonClientCalcSizeHandler(msg->hwnd, msg->message,
			msg->wParam, msg->lParam, &res)) {
			result = decltype(result)(res);
			return true;
			switch (msg->message) {
			case WM_NCCALCSIZE: {
			// 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 acquires the initial data.
			if (lastMessageContext) {
			LRESULT res;
			if (lastMessageContext->nonClientCalcSizeHandler(
			msg->hwnd, msg->message, msg->wParam, msg->lParam, &res)) {
			result = decltype(result)(res);
			return true;
			}
			}
			break;
			}

			// case WM_NCHITTEST: {
			// // The child window must return HTTRANSPARENT when processing
			// WM_NCHITTEST for
			// // the parent window to receive WM_NCHITTEST.
			// if (!lastMessageContext) {
			// auto rootHWnd = ::GetAncestor(msg->hwnd, GA_ROOT);
			// if (rootHWnd != msg->hwnd) {
			// if (auto ctx = g_wndProcHash->value(rootHWnd)) {
			// *result = HTTRANSPARENT;
			// return true;
			// }
			// }
			// }
			// break;
			// }
			}
			return false;
			}

			static WindowsNativeEventFilter *instance;
			static Win32WindowContext *lastMessageContext;
			static inline WindowsNativeEventFilter *instance = nullptr;
			static inline Win32WindowContext *lastMessageContext = nullptr;

			static inline void install() {
			if (instance) {
			@@ -455,9 +535,6 @@
			instance = nullptr;
			}
			};

			WindowsNativeEventFilter *WindowsNativeEventFilter::instance = nullptr;
			Win32WindowContext *WindowsNativeEventFilter::lastMessageContext = nullptr;

			// https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/plugins/platforms/windows/qwindowscontext.cpp#L1025
			// We can see from the source code that Qt will filter out some messages first and then send the
			@@ -524,18 +601,25 @@
			return ::DefWindowProcW(hWnd, message, wParam, lParam);
			}

			WindowsNativeEventFilter::lastMessageContext = ctx;
			const auto &contextCleaner = qScopeGuard([]() {
			WindowsNativeEventFilter::lastMessageContext = nullptr; //
			});

			// Since Qt does the necessary processing of the WM_NCCALCSIZE message, we need to
			// forward it right away and process it in our native event filter.
			if (message == WM_NCCALCSIZE) {
			WindowsNativeEventFilter::lastMessageContext = ctx;
			LRESULT result = ::CallWindowProcW(g_qtWindowProc, hWnd, message, wParam, lParam);
			WindowsNativeEventFilter::lastMessageContext = nullptr;
			return result;
			return ::CallWindowProcW(g_qtWindowProc, hWnd, message, wParam, lParam);
			}

			// Try hooked procedure and save result
			LRESULT result;
			if (ctx->windowProc(hWnd, message, wParam, lParam, &result)) {
			// https://github.com/stdware/qwindowkit/issues/45
			// Forward the event to user-defined native event filters, there may be some messages
			// that need to be processed by the user.
			std::ignore =
			forwardFilteredEvent(ctx->window(), hWnd, message, wParam, lParam, &result);
			return result;
			}

			@@ -544,18 +628,10 @@
			}

			static inline void addManagedWindow(QWindow window, HWND hWnd, Win32WindowContext ctx) {
			const auto margins = [hWnd]() -> QMargins {
			const auto titleBarHeight = int(getTitleBarHeight(hWnd));
			if (isWin10OrGreater()) {
			return {0, -titleBarHeight, 0, 0};
			} else {
			const auto frameSize = int(getResizeBorderThickness(hWnd));
			return {-frameSize, -titleBarHeight, -frameSize, -frameSize};
			}
			}();

			// Inform Qt we want and have set custom margins
			setInternalWindowFrameMargins(window, margins);
			if (isSystemBorderEnabled()) {
			// Inform Qt we want and have set custom margins
			setInternalWindowFrameMargins(window, QMargins(0, -int(getTitleBarHeight(hWnd)), 0, 0));
			}

			// Store original window proc
			if (!g_qtWindowProc) {
			@@ -570,6 +646,11 @@

			// Save window handle mapping
			g_wndProcHash->insert(hWnd, ctx);

			// Force a WM_NCCALCSIZE message manually to avoid the title bar become visible
			// while Qt is re-creating the window (such as setWindowFlag(s) calls). It has
			// been observed by our users.
			triggerFrameChange(hWnd);
			}

			static inline void removeManagedWindow(HWND hWnd) {
			@@ -587,8 +668,8 @@
			}

			Win32WindowContext::~Win32WindowContext() {
			if (windowId) {
			removeManagedWindow(reinterpret_cast<HWND>(windowId));
			if (m_windowId) {
			removeManagedWindow(reinterpret_cast<HWND>(m_windowId));
			}
			}

			@@ -598,35 +679,28 @@

			void Win32WindowContext::virtual_hook(int id, void *data) {
			switch (id) {
			case CentralizeHook: {
			if (!windowId)
			return;
			const auto hwnd = reinterpret_cast<HWND>(windowId);
			moveWindowToDesktopCenter(hwnd);
			return;
			}

			case RaiseWindowHook: {
			if (!windowId)
			if (!m_windowId)
			return;
			const auto hwnd = reinterpret_cast<HWND>(windowId);
			m_delegate->setWindowVisible(m_host, true);
			const auto hwnd = reinterpret_cast<HWND>(m_windowId);
			bringWindowToFront(hwnd);
			return;
			}

			case ShowSystemMenuHook: {
			if (!windowId)
			if (!m_windowId)
			return;
			const auto &pos = static_cast<const QPoint >(data);
			auto hWnd = reinterpret_cast<HWND>(windowId);
			auto hWnd = reinterpret_cast<HWND>(m_windowId);
			#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
			const QPoint nativeGlobalPos =
			QHighDpi::toNativeGlobalPosition(pos, m_windowHandle);
			QHighDpi::toNativeGlobalPosition(pos, m_windowHandle.data());
			#else
			const QPoint nativeGlobalPos = QHighDpi::toNativePixels(pos, m_windowHandle);
			const QPoint nativeGlobalPos = QHighDpi::toNativePixels(pos, m_windowHandle.data());
			#endif
			showSystemMenu2(hWnd, qpoint2point(nativeGlobalPos), false,
			m_delegate->isHostSizeFixed(m_host));
			std::ignore = showSystemMenu_sys(hWnd, qpoint2point(nativeGlobalPos), false,
			isHostSizeFixed());
			return;
			}

			@@ -640,18 +714,19 @@
			return;
			}

			case DrawWindows10BorderHook: {
			if (!windowId)
			#if QWINDOWKIT_CONFIG(ENABLE_WINDOWS_SYSTEM_BORDERS)
			case DrawWindows10BorderHook_Emulated: {
			if (!m_windowId)
			return;

			auto args = static_cast<void **>(data);
			auto &painter = static_cast<QPainter >(args[0]);
			const auto &rect = static_cast<const QRect >(args[1]);
			const auto &region = static_cast<const QRegion >(args[2]);
			const auto hwnd = reinterpret_cast<HWND>(windowId);
			const auto hwnd = reinterpret_cast<HWND>(m_windowId);

			QPen pen;
			pen.setWidth(getWindowFrameBorderThickness(hwnd) * 2);
			pen.setWidth(int(getWindowFrameBorderThickness(hwnd)) * 2);

			const bool dark = isDarkThemeActive() && isDarkWindowFrameEnabled(hwnd);
			if (m_delegate->isWindowActive(m_host)) {
			@@ -671,7 +746,7 @@
			}
			painter.save();

			// We needs anti-aliasing to give us better result.
			// We need antialiasing to give us better result.
			painter.setRenderHint(QPainter::Antialiasing);

			painter.setPen(pen);
			@@ -683,55 +758,116 @@
			return;
			}

			case DrawWindows10BorderHook_Native: {
			if (!m_windowId)
			return;

			// https://github.com/microsoft/terminal/blob/71a6f26e6ece656084e87de1a528c4a8072eeabd/src/cascadia/WindowsTerminal/NonClientIslandWindow.cpp#L1025
			// https://docs.microsoft.com/en-us/windows/win32/dwm/customframe#extending-the-client-frame
			// Draw a black rectangle to make Windows native top border show

			auto hWnd = reinterpret_cast<HWND>(m_windowId);
			HDC hdc = ::GetDC(hWnd);
			RECT windowRect{};
			::GetClientRect(hWnd, &windowRect);
			RECT rcTopBorder = {
			0,
			0,
			RECT_WIDTH(windowRect),
			int(getWindowFrameBorderThickness(hWnd)),
			};
			::FillRect(hdc, &rcTopBorder,
			reinterpret_cast<HBRUSH>(::GetStockObject(BLACK_BRUSH)));
			::ReleaseDC(hWnd, hdc);
			return;
			}
			#endif

			default:
			break;
			}
			AbstractWindowContext::virtual_hook(id, data);
			}

			bool Win32WindowContext::needBorderPainter() const {
			return isWin10OrGreater() && !isWin11OrGreater();
			}
			QVariant Win32WindowContext::windowAttribute(const QString &key) const {
			if (key == QStringLiteral("window-rect")) {
			if (!m_windowId)
			return {};

			int Win32WindowContext::borderThickness() const {
			return getWindowFrameBorderThickness(reinterpret_cast<HWND>(windowId));
			}

			void Win32WindowContext::winIdChanged() {
			// If the original window id is valid, remove all resources related
			if (windowId) {
			removeManagedWindow(reinterpret_cast<HWND>(windowId));
			windowId = 0;
			RECT frame{};
			auto hwnd = reinterpret_cast<HWND>(m_windowId);
			// According to MSDN, WS_OVERLAPPED is not allowed for AdjustWindowRect.
			auto style = static_cast<DWORD>(::GetWindowLongPtrW(hwnd, GWL_STYLE) & ~WS_OVERLAPPED);
			auto exStyle = static_cast<DWORD>(::GetWindowLongPtrW(hwnd, GWL_EXSTYLE));
			const DynamicApis &apis = DynamicApis::instance();
			if (apis.pAdjustWindowRectExForDpi) {
			apis.pAdjustWindowRectExForDpi(&frame, style, FALSE, exStyle,
			getDpiForWindow(hwnd));
			} else {
			::AdjustWindowRectEx(&frame, style, FALSE, exStyle);
			}
			return QVariant::fromValue(rect2qrect(frame));
			}

			if (!m_windowHandle) {
			if (key == QStringLiteral("win10-border-needed")) {
			return isSystemBorderEnabled() && !isWin11OrGreater();
			}

			if (key == QStringLiteral("windows-system-border-enabled")) {
			return isSystemBorderEnabled();
			}

			if (key == QStringLiteral("border-thickness")) {
			return m_windowId
			? int(getWindowFrameBorderThickness(reinterpret_cast<HWND>(m_windowId)))
			: 0;
			}

			if (key == QStringLiteral("title-bar-height")) {
			return m_windowId ? int(getTitleBarHeight(reinterpret_cast<HWND>(m_windowId))) : 0;
			}
			return AbstractWindowContext::windowAttribute(key);
			}

			void Win32WindowContext::winIdChanged(WId winId, WId oldWinId) {
			// Reset the context data
			mouseLeaveBlocked = false;
			lastHitTestResult = WindowPart::Outside;
			lastHitTestResultRaw = HTNOWHERE;

			// If the original window id is valid, remove all resources related
			if (oldWinId) {
			removeManagedWindow(reinterpret_cast<HWND>(oldWinId));
			}
			if (!winId) {
			return;
			}

			// Install window hook
			auto winId = m_windowHandle->winId();
			auto hWnd = reinterpret_cast<HWND>(winId);
			if (!isSystemBorderEnabled()) {
			static auto margins = QVariant::fromValue(QMargins(1, 1, 1, 1));

			if (!isWin10OrGreater()) {
			static constexpr const MARGINS margins = {1, 1, 1, 1};
			DynamicApis::instance().pDwmExtendFrameIntoClientArea(hWnd, &margins);
			// If we remove the system border, the window will lose its shadow. If dwm is enabled,
			// then we need to set at least 1px margins, otherwise the following operation will
			// fail with no effect.
			setWindowAttribute(QStringLiteral("extra-margins"), margins);
			}

			#if QT_VERSION < QT_VERSION_CHECK(6, 5, 0)
			for (const auto attr : {
			_DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1,
			_DWMWA_USE_IMMERSIVE_DARK_MODE,
			}) {
			const BOOL enable = TRUE;
			DynamicApis::instance().pDwmSetWindowAttribute(hWnd, attr, &enable, sizeof(enable));
			// We should disable WS_SYSMENU, otherwise the system button icons will be visible if mica
			// is enabled and the title bar is transparent.
			{
			auto style = ::GetWindowLongPtrW(hWnd, GWL_STYLE);
			if (isSystemBorderEnabled()) {
			::SetWindowLongPtrW(hWnd, GWL_STYLE, style & (~WS_SYSMENU));
			} else {
			::SetWindowLongPtrW(hWnd, GWL_STYLE,
			(style \| WS_THICKFRAME \| WS_CAPTION) & (~WS_SYSMENU));
			}
			}
			#endif

			// Add managed window
			addManagedWindow(m_windowHandle, hWnd, this);

			// Cache win id
			windowId = winId;
			}

			bool Win32WindowContext::windowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam,
			@@ -741,8 +877,8 @@
			// We should skip these messages otherwise we will get crashes.
			// NOTE: WM_QUIT won't be posted to the WindowProc function.
			switch (message) {
			case WM_CLOSE:
			case WM_DESTROY:
			case WM_CLOSE:
			case WM_NCDESTROY:
			// Undocumented messages:
			case WM_UAHDESTROYWINDOW:
			@@ -773,18 +909,237 @@

			// Forward to native event filter subscribers
			if (!m_nativeEventFilters.isEmpty()) {
			MSG msg;
			msg.hwnd = hWnd;
			msg.message = message;
			msg.wParam = wParam;
			msg.lParam = lParam;
			MSG msg = createMessageBlock(hWnd, message, wParam, lParam);
			QT_NATIVE_EVENT_RESULT_TYPE res = 0;
			if (dispatch(QByteArrayLiteral("windows_generic_MSG"), &msg, &res)) {
			if (nativeDispatch(nativeEventType(), &msg, &res)) {
			*result = LRESULT(res);
			return true;
			}
			}
			return false; // Not handled
			}

			bool Win32WindowContext::windowAttributeChanged(const QString &key, const QVariant &attribute,
			const QVariant &oldAttribute) {
			Q_UNUSED(oldAttribute)

			const auto hwnd = reinterpret_cast<HWND>(m_windowId);
			Q_ASSERT(hwnd);

			const DynamicApis &apis = DynamicApis::instance();
			const auto &extendMargins = [this, &apis, hwnd]() {
			// For some unknown reason, the window background is totally black and extending
			// the window frame into the client area seems to fix it magically.
			// After many times of trying, we found that the Acrylic/Mica/Mica Alt background
			// only appears on the native Win32 window's background, so naturally we want to
			// extend the window frame into the whole client area to be able to let the special
			// material fill the whole window. Previously we are using negative margins because
			// it's widely known that using negative margins will let the window frame fill
			// the whole window and that's indeed what we wanted to do, however, later we found
			// that doing so is causing issues. When the user enabled the "show accent color on
			// window title bar and borders" option on system personalize settings, a 30px bar
			// would appear on window top. It has the same color with the system accent color.
			// Actually it's the original title bar we've already hidden, and it magically
			// appears again when we use negative margins to extend the window frame. And again
			// after some experiments, I found that the title bar won't appear if we don't extend
			// from the top side. In the end I found that we only need to extend from the left
			// side if we extend long enough. In this way we can see the special material even
			// when the host object is a QWidget and the title bar still remain hidden. But even
			// though this solution seems perfect, I really don't know why it works. The following
			// hack is totally based on experiments.
			static constexpr const MARGINS margins = {65536, 0, 0, 0};
			apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
			};
			const auto &restoreMargins = [this, &apis, hwnd]() {
			auto margins = qmargins2margins(
			windowAttribute(QStringLiteral("extra-margins")).value<QMargins>());
			apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
			};

			const auto &effectBugWorkaround = [this, hwnd]() {
			// We don't need the following HACK for QWidget windows.
			// Completely based on actual experiments, root reason is totally unknown.
			if (m_host->isWidgetType()) {
			return;
			}
			static QSet<WId> bugWindowSet{};
			if (bugWindowSet.contains(m_windowId)) {
			return;
			}
			bugWindowSet.insert(m_windowId);
			RECT rect{};
			::GetWindowRect(hwnd, &rect);
			::MoveWindow(hwnd, rect.left, rect.top, 1, 1, FALSE);
			::MoveWindow(hwnd, rect.right - 1, rect.bottom - 1, 1, 1, FALSE);
			::MoveWindow(hwnd, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top,
			FALSE);
			};

			if (key == QStringLiteral("extra-margins")) {
			auto margins = qmargins2margins(attribute.value<QMargins>());
			return SUCCEEDED(apis.pDwmExtendFrameIntoClientArea(hwnd, &margins));
			}

			if (key == QStringLiteral("dark-mode")) {
			if (!isWin101809OrGreater()) {
			return false;
			}

			BOOL enable = attribute.toBool();
			if (isWin101903OrGreater()) {
			apis.pSetPreferredAppMode(enable ? PAM_AUTO : PAM_DEFAULT);
			} else {
			apis.pAllowDarkModeForApp(enable);
			}
			const auto attr = isWin1020H1OrGreater() ? _DWMWA_USE_IMMERSIVE_DARK_MODE
			: _DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1;
			apis.pDwmSetWindowAttribute(hwnd, attr, &enable, sizeof(enable));

			apis.pFlushMenuThemes();
			return true;
			}

			// For Win11 or later
			if (key == QStringLiteral("mica")) {
			if (!isWin11OrGreater()) {
			return false;
			}
			if (attribute.toBool()) {
			extendMargins();
			if (isWin1122H2OrGreater()) {
			// Use official DWM API to enable Mica, available since Windows 11 22H2
			// (10.0.22621).
			const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_MAINWINDOW;
			apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType,
			sizeof(backdropType));
			} else {
			// Use undocumented DWM API to enable Mica, available since Windows 11
			// (10.0.22000).
			const BOOL enable = TRUE;
			apis.pDwmSetWindowAttribute(hwnd, _DWMWA_MICA_EFFECT, &enable, sizeof(enable));
			}
			} else {
			if (isWin1122H2OrGreater()) {
			const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_AUTO;
			apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType,
			sizeof(backdropType));
			} else {
			const BOOL enable = FALSE;
			apis.pDwmSetWindowAttribute(hwnd, _DWMWA_MICA_EFFECT, &enable, sizeof(enable));
			}
			restoreMargins();
			}
			effectBugWorkaround();
			return true;
			}

			if (key == QStringLiteral("mica-alt")) {
			if (!isWin1122H2OrGreater()) {
			return false;
			}
			if (attribute.toBool()) {
			extendMargins();
			// Use official DWM API to enable Mica Alt, available since Windows 11 22H2
			// (10.0.22621).
			const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_TABBEDWINDOW;
			apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType,
			sizeof(backdropType));
			} else {
			const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_AUTO;
			apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType,
			sizeof(backdropType));
			restoreMargins();
			}
			effectBugWorkaround();
			return true;
			}

			if (key == QStringLiteral("acrylic-material")) {
			if (!isWin11OrGreater()) {
			return false;
			}
			if (attribute.toBool()) {
			extendMargins();

			const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_TRANSIENTWINDOW;
			apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType,
			sizeof(backdropType));

			// PRIVATE API REFERENCE:
			// QColor gradientColor = {};
			// ACCENT_POLICY policy{};
			// policy.dwAccentState = ACCENT_ENABLE_ACRYLICBLURBEHIND;
			// policy.dwAccentFlags = ACCENT_ENABLE_ACRYLIC_WITH_LUMINOSITY;
			// // This API expects the #AABBGGRR format.
			// policy.dwGradientColor =
			// DWORD(qRgba(gradientColor.blue(), gradientColor.green(),
			// gradientColor.red(), gradientColor.alpha()));
			// WINDOWCOMPOSITIONATTRIBDATA wcad{};
			// wcad.Attrib = WCA_ACCENT_POLICY;
			// wcad.pvData = &policy;
			// wcad.cbData = sizeof(policy);
			// apis.pSetWindowCompositionAttribute(hwnd, &wcad);
			} else {
			const _DWM_SYSTEMBACKDROP_TYPE backdropType = _DWMSBT_AUTO;
			apis.pDwmSetWindowAttribute(hwnd, _DWMWA_SYSTEMBACKDROP_TYPE, &backdropType,
			sizeof(backdropType));

			// PRIVATE API REFERENCE:
			// ACCENT_POLICY policy{};
			// policy.dwAccentState = ACCENT_DISABLED;
			// policy.dwAccentFlags = ACCENT_NONE;
			// WINDOWCOMPOSITIONATTRIBDATA wcad{};
			// wcad.Attrib = WCA_ACCENT_POLICY;
			// wcad.pvData = &policy;
			// wcad.cbData = sizeof(policy);
			// apis.pSetWindowCompositionAttribute(hwnd, &wcad);

			restoreMargins();
			}
			effectBugWorkaround();
			return true;
			}

			if (key == QStringLiteral("dwm-blur")) {
			// Extending window frame would break this effect for some unknown reason.
			restoreMargins();
			if (attribute.toBool()) {
			if (isWin8OrGreater()) {
			ACCENT_POLICY policy{};
			policy.dwAccentState = ACCENT_ENABLE_BLURBEHIND;
			policy.dwAccentFlags = ACCENT_NONE;
			WINDOWCOMPOSITIONATTRIBDATA wcad{};
			wcad.Attrib = WCA_ACCENT_POLICY;
			wcad.pvData = &policy;
			wcad.cbData = sizeof(policy);
			apis.pSetWindowCompositionAttribute(hwnd, &wcad);
			} else {
			DWM_BLURBEHIND bb{};
			bb.fEnable = TRUE;
			bb.dwFlags = DWM_BB_ENABLE;
			apis.pDwmEnableBlurBehindWindow(hwnd, &bb);
			}
			} else {
			if (isWin8OrGreater()) {
			ACCENT_POLICY policy{};
			policy.dwAccentState = ACCENT_DISABLED;
			policy.dwAccentFlags = ACCENT_NONE;
			WINDOWCOMPOSITIONATTRIBDATA wcad{};
			wcad.Attrib = WCA_ACCENT_POLICY;
			wcad.pvData = &policy;
			wcad.cbData = sizeof(policy);
			apis.pSetWindowCompositionAttribute(hwnd, &wcad);
			} else {
			DWM_BLURBEHIND bb{};
			bb.fEnable = FALSE;
			bb.dwFlags = DWM_BB_ENABLE;
			apis.pDwmEnableBlurBehindWindow(hwnd, &bb);
			}
			}
			effectBugWorkaround();
			return true;
			}
			return false;
			}

			QWK_USED static constexpr const struct {
			@@ -944,7 +1299,7 @@
			POINT screenPoint{GET_X_LPARAM(dwScreenPos), GET_Y_LPARAM(dwScreenPos)};
			::ScreenToClient(hWnd, &screenPoint);
			QPoint qtScenePos = QHighDpi::fromNativeLocalPosition(point2qpoint(screenPoint),
			m_windowHandle);
			m_windowHandle.data());
			auto dummy = WindowAgentBase::Unknown;
			if (isInSystemButtons(qtScenePos, &dummy)) {
			// We must record whether the last WM_MOUSELEAVE was filtered, because if
			@@ -989,9 +1344,8 @@
			case WM_NCPOINTERUP:
			#endif
			case WM_NCMOUSEHOVER: {
			const WindowPart currentWindowPart = lastHitTestResult;
			if (message == WM_NCMOUSEMOVE) {
			if (currentWindowPart != WindowPart::ChromeButton) {
			if (lastHitTestResult != WindowPart::ChromeButton) {
			// https://github.com/qt/qtbase/blob/e26a87f1ecc40bc8c6aa5b889fce67410a57a702/src/widgets/kernel/qwidgetwindow.cpp#L472
			// When the mouse press event arrives, QWidgetWindow will implicitly grab
			// the top widget right under the mouse, and set `qt_button_down` to this
			@@ -1040,29 +1394,60 @@
			// the above problems would not arise.

			m_delegate->resetQtGrabbedControl(m_host);

			// If the mouse moves from chrome buttons to other non-client areas, a
			// WM_MOUSELEAVE message should be sent.
			if (mouseLeaveBlocked) {
			emulateClientAreaMessage(hWnd, message, wParam, lParam,
			WM_NCMOUSELEAVE);
			}
			}

			// We need to make sure we get the right hit-test result when a WM_NCMOUSELEAVE
			// comes, so we reset it when we receive a WM_NCMOUSEMOVE.

			// If the mouse is entering the client area, there must be a WM_NCHITTEST
			// setting it to `Client` before the WM_NCMOUSELEAVE comes; if the mouse is
			// leaving the window, current window part remains as `Outside`.
			lastHitTestResult = WindowPart::Outside;
			}

			if (currentWindowPart == WindowPart::ChromeButton) {
			emulateClientAreaMessage(hWnd, message, wParam, lParam);
			if (lastHitTestResult == WindowPart::ChromeButton) {
			if (message == WM_NCMOUSEMOVE) {
			// ### FIXME FIXME FIXME
			// ### FIXME: Calling DefWindowProc() here is really dangerous, investigate
			// how to avoid doing this.
			// ### FIXME FIXME FIXME
			*result = ::DefWindowProcW(hWnd, WM_NCMOUSEMOVE, wParam, lParam);
			emulateClientAreaMessage(hWnd, message, wParam, lParam);
			return true;
			}

			if (lastHitTestResultRaw == HTSYSMENU) {
			switch (message) {
			case WM_NCLBUTTONDOWN:
			if (iconButtonClickLevel == 0) {
			// A message of WM_SYSCOMMAND with SC_MOUSEMENU will be sent by
			// Windows, and the current control flow will be blocked by the
			// menu while Windows will create and execute a new event loop
			// until the menu returns
			iconButtonClickTime = ::GetTickCount64();
			*result = ::DefWindowProcW(hWnd, message, wParam, lParam);
			iconButtonClickTime = 0;
			if (iconButtonClickLevel & IconButtonTriggersClose) {
			::PostMessageW(hWnd, WM_SYSCOMMAND, SC_CLOSE, 0);
			}
			if (iconButtonClickLevel & IconButtonDoubleClicked) {
			iconButtonClickLevel = 0;
			}
			// Otherwise, no need to reset `iconButtonClickLevel` if not to
			// close, if it has value, there must be another incoming
			// WM_NCLBUTTONDOWN
			} else {
			iconButtonClickLevel = 0;
			}
			break;
			case WM_NCLBUTTONDBLCLK:
			// A message of WM_SYSCOMMAND with SC_CLOSE will be sent by Windows
			*result = ::DefWindowProcW(hWnd, message, wParam, lParam);
			break;
			default:
			*result = FALSE;
			emulateClientAreaMessage(hWnd, message, wParam, lParam);
			break;
			}
			} else {
			// According to MSDN, we should return non-zero for X button messages to
			// indicate we have handled these messages (due to historical reasons), for
			@@ -1071,6 +1456,7 @@
			(((message >= WM_NCXBUTTONDOWN) && (message <= WM_NCXBUTTONDBLCLK))
			? TRUE
			: FALSE);
			emulateClientAreaMessage(hWnd, message, wParam, lParam);
			}
			return true;
			}
			@@ -1084,7 +1470,7 @@
			// pressing area as HTCLIENT which maybe because of our former retransmission of
			// WM_NCLBUTTONDOWN, as a result, a WM_NCMOUSELEAVE will come immediately and a
			// lot of WM_MOUSEMOVE will come if we move the mouse, we should track the mouse
			// in advance.
			// in advance. (May be redundant?)
			if (mouseLeaveBlocked) {
			mouseLeaveBlocked = false;
			requestForMouseLeaveMessage(hWnd, false);
			@@ -1118,19 +1504,6 @@
			bool Win32WindowContext::customWindowHandler(HWND hWnd, UINT message, WPARAM wParam,
			LPARAM lParam, LRESULT *result) {
			switch (message) {
			case WM_SHOWWINDOW: {
			if (!centered) {
			// If wParam is TRUE, the window is being shown.
			// If lParam is zero, the message was sent because of a call to the ShowWindow
			// function.
			if (wParam && !lParam) {
			centered = true;
			moveWindowToDesktopCenter(hWnd);
			}
			}
			break;
			}

			case WM_NCHITTEST: {
			// 原生Win32窗口只有顶边是在窗口内部resize的，其余三边都是在窗口
			// 外部进行resize的，其原理是，WS_THICKFRAME这个窗口样式会在窗
			@@ -1213,7 +1586,8 @@
			// color, our homemade top border can almost have exactly the same
			// appearance with the system's one.
			[[maybe_unused]] const auto &hitTestRecorder = qScopeGuard([this, result]() {
			lastHitTestResult = getHitWindowPart(int(*result)); //
			lastHitTestResultRaw = int(*result);
			lastHitTestResult = getHitWindowPart(lastHitTestResultRaw);
			});

			POINT nativeGlobalPos{GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
			@@ -1225,15 +1599,24 @@
			auto clientWidth = RECT_WIDTH(clientRect);
			auto clientHeight = RECT_HEIGHT(clientRect);

			QPoint qtScenePos =
			QHighDpi::fromNativeLocalPosition(point2qpoint(nativeLocalPos), m_windowHandle);
			QPoint qtScenePos = QHighDpi::fromNativeLocalPosition(point2qpoint(nativeLocalPos),
			m_windowHandle.data());

			bool isFixedSize = m_delegate->isHostSizeFixed(m_host);
			bool isTitleBar = isInTitleBarDraggableArea(qtScenePos);
			bool dontOverrideCursor = false; // ### TODO
			int frameSize = getResizeBorderThickness(hWnd);

			bool isFixedWidth = isHostWidthFixed();
			bool isFixedHeight = isHostHeightFixed();
			bool isFixedSize = isHostSizeFixed();
			bool isInLeftBorder = nativeLocalPos.x <= frameSize;
			bool isInTopBorder = nativeLocalPos.y <= frameSize;
			bool isInRightBorder = nativeLocalPos.x > clientWidth - frameSize;
			bool isInBottomBorder = nativeLocalPos.y > clientHeight - frameSize;
			bool isInTitleBar = isInTitleBarDraggableArea(qtScenePos);
			WindowAgentBase::SystemButton sysButtonType = WindowAgentBase::Unknown;
			if (!isFixedSize && isInSystemButtons(qtScenePos, &sysButtonType)) {
			bool isInCaptionButtons = isInSystemButtons(qtScenePos, &sysButtonType);
			static constexpr bool dontOverrideCursor = false; // ### TODO

			if (isInCaptionButtons) {
			// Firstly, we set the hit test result to a default value to be able to detect
			// whether we have changed it or not afterwards.
			*result = HTNOWHERE;
			@@ -1243,29 +1626,41 @@
			// window is not maximized/fullscreen/minimized, of course).
			if (isWindowNoState(hWnd)) {
			static constexpr const quint8 kBorderSize = 2;
			bool isTop = (nativeLocalPos.y <= kBorderSize);
			bool isTop = nativeLocalPos.y <= kBorderSize;
			bool isLeft = nativeLocalPos.x <= kBorderSize;
			bool isRight = (nativeLocalPos.x >= (clientWidth - kBorderSize));
			bool isRight = nativeLocalPos.x > clientWidth - kBorderSize;
			if (isTop \|\| isLeft \|\| isRight) {
			if (dontOverrideCursor) {
			if (isFixedSize \|\| 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);
			*result = isInTitleBar ? HTCAPTION : HTCLIENT;
			} else {
			if (isTop) {
			if (isLeft) {
			*result = HTTOPLEFT;
			if (isFixedWidth) {
			*result = HTTOP;
			} else if (isFixedHeight) {
			*result = HTLEFT;
			} else {
			*result = HTTOPLEFT;
			}
			} else if (isRight) {
			*result = HTTOPRIGHT;
			if (isFixedWidth) {
			*result = HTTOP;
			} else if (isFixedHeight) {
			*result = HTRIGHT;
			} else {
			*result = HTTOPRIGHT;
			}
			} else {
			*result = HTTOP;
			*result = isFixedHeight ? HTBORDER : HTTOP;
			}
			} else {
			if (isLeft) {
			*result = HTLEFT;
			if (isFixedWidth) {
			*result = HTBORDER;
			} else {
			*result = HTRIGHT;
			*result = isLeft ? HTLEFT : HTRIGHT;
			}
			}
			}
			@@ -1307,12 +1702,10 @@
			// OK, we are not inside any chrome buttons, try to find out which part of the
			// window are we hitting.

			bool max = IsMaximized(hWnd);
			bool max = isMaximized(hWnd);
			bool full = isFullScreen(hWnd);
			int frameSize = getResizeBorderThickness(hWnd);
			bool isTop = (nativeLocalPos.y < frameSize);

			if (isWin10OrGreater()) {
			if (isSystemBorderEnabled()) {
			// This will handle the left, right and bottom parts of the frame
			// because we didn't change them.
			LRESULT originalHitTestResult = ::DefWindowProcW(hWnd, WM_NCHITTEST, 0, lParam);
			@@ -1322,8 +1715,51 @@
			// outside the window, that is, the three transparent window resize area.
			// Returning HTCLIENT will confuse Windows, we can't put our controls there
			// anyway.
			*result = ((isFixedSize \|\| dontOverrideCursor) ? HTBORDER
			: originalHitTestResult);
			*result = HTNOWHERE; // Make sure we can know we don't set any value
			// explicitly later.
			if (originalHitTestResult == HTCAPTION) {
			} else if (isFixedSize \|\| dontOverrideCursor) {
			*result = HTBORDER;
			} else if (isFixedWidth \|\| isFixedHeight) {
			if (originalHitTestResult == HTTOPLEFT) {
			if (isFixedWidth) {
			*result = HTTOP;
			} else {
			*result = HTLEFT;
			}
			} else if (originalHitTestResult == HTTOPRIGHT) {
			if (isFixedWidth) {
			*result = HTTOP;
			} else {
			*result = HTRIGHT;
			}
			} else if (originalHitTestResult == HTBOTTOMRIGHT) {
			if (isFixedWidth) {
			*result = HTBOTTOM;
			} else {
			*result = HTRIGHT;
			}
			} else if (originalHitTestResult == HTBOTTOMLEFT) {
			if (isFixedWidth) {
			*result = HTBOTTOM;
			} else {
			*result = HTLEFT;
			}
			} else if (originalHitTestResult == HTLEFT \|\|
			originalHitTestResult == HTRIGHT) {
			if (isFixedWidth) {
			*result = HTBORDER;
			}
			} else if (originalHitTestResult == HTTOP \|\|
			originalHitTestResult == HTBOTTOM) {
			if (isFixedHeight) {
			*result = HTBORDER;
			}
			}
			}
			if (*result == HTNOWHERE) {
			*result = originalHitTestResult;
			}
			return true;
			}
			if (full) {
			@@ -1331,7 +1767,7 @@
			return true;
			}
			if (max) {
			*result = (isTitleBar ? HTCAPTION : HTCLIENT);
			*result = isInTitleBar ? HTCAPTION : HTCLIENT;
			return true;
			}
			// At this point, we know that the cursor is inside the client area,
			@@ -1339,16 +1775,25 @@
			// title bar or the drag bar. Apparently, it must be the drag bar or
			// the little border at the top which the user can use to move or
			// resize the window.
			if (isTop) {
			if (isInTopBorder) {
			// Return HTCLIENT instead of HTBORDER here, because the mouse is
			// inside our homemade title bar now, return HTCLIENT to let our
			// title bar can still capture mouse events.
			*result = ((isFixedSize \|\| dontOverrideCursor)
			? (isTitleBar ? HTCAPTION : HTCLIENT)
			: HTTOP);
			*result = [&]() {
			if (isFixedSize \|\| isFixedHeight \|\| dontOverrideCursor \|\|
			(isFixedWidth && (isInLeftBorder \|\| isInRightBorder))) {
			if (isInTitleBar) {
			return HTCAPTION;
			} else {
			return HTCLIENT;
			}
			} else {
			return HTTOP;
			}
			}();
			return true;
			}
			if (isTitleBar) {
			if (isInTitleBar) {
			*result = HTCAPTION;
			return true;
			}
			@@ -1359,58 +1804,86 @@
			*result = HTCLIENT;
			return true;
			}
			if (max) {
			*result = (isTitleBar ? HTCAPTION : HTCLIENT);
			if (max \|\| isFixedSize \|\| dontOverrideCursor) {
			*result = isInTitleBar ? HTCAPTION : HTCLIENT;
			return true;
			}
			if (!isFixedSize) {
			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 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
			// inside our window can still capture mouse events.
			*result = (isTitleBar ? HTCAPTION : HTCLIENT);
			return true;
			if (isFixedWidth \|\| isFixedHeight) {
			if (isInLeftBorder && isInTopBorder) {
			if (isFixedWidth) {
			*result = HTTOP;
			} else {
			*result = HTLEFT;
			}
			} else if (isInRightBorder && isInTopBorder) {
			if (isFixedWidth) {
			*result = HTTOP;
			} else {
			*result = HTRIGHT;
			}
			} else if (isInRightBorder && isInBottomBorder) {
			if (isFixedWidth) {
			*result = HTBOTTOM;
			} else {
			*result = HTRIGHT;
			}
			} else if (isInLeftBorder && isInBottomBorder) {
			if (isFixedWidth) {
			*result = HTBOTTOM;
			} else {
			*result = HTLEFT;
			}
			} else if (isInLeftBorder \|\| isInRightBorder) {
			if (isFixedWidth) {
			*result = HTCLIENT;
			} else {
			*result = isInLeftBorder ? HTLEFT : HTRIGHT;
			}
			} else if (isInTopBorder \|\| isInBottomBorder) {
			if (isFixedHeight) {
			*result = HTCLIENT;
			} else {
			*result = isInTopBorder ? HTTOP : HTBOTTOM;
			}
			} else {
			*result = HTCLIENT;
			}
			if (isTop) {
			if (isLeft) {
			return true;
			} else {
			if (isInTopBorder) {
			if (isInLeftBorder) {
			*result = HTTOPLEFT;
			return true;
			}
			if (isRight) {
			if (isInRightBorder) {
			*result = HTTOPRIGHT;
			return true;
			}
			*result = HTTOP;
			return true;
			}
			if (isBottom) {
			if (isLeft) {
			if (isInBottomBorder) {
			if (isInLeftBorder) {
			*result = HTBOTTOMLEFT;
			return true;
			}
			if (isRight) {
			if (isInRightBorder) {
			*result = HTBOTTOMRIGHT;
			return true;
			}
			*result = HTBOTTOM;
			return true;
			}
			if (isLeft) {
			if (isInLeftBorder) {
			*result = HTLEFT;
			return true;
			}
			if (isRight) {
			if (isInRightBorder) {
			*result = HTRIGHT;
			return true;
			}
			}
			if (isTitleBar) {
			if (isInTitleBar) {
			*result = HTCAPTION;
			return true;
			}
			@@ -1436,11 +1909,23 @@
			break;
			}

			case WM_SHOWWINDOW: {
			if (!wParam \|\| !isWindowNoState(hWnd) \|\| isFullScreen(hWnd)) {
			break;
			}
			RECT windowRect{};
			::GetWindowRect(hWnd, &windowRect);
			static constexpr const auto swpFlags = SWP_NOMOVE \| SWP_NOZORDER \| SWP_NOACTIVATE \| SWP_FRAMECHANGED \| SWP_NOOWNERZORDER;
			::SetWindowPos(hWnd, nullptr, 0, 0, RECT_WIDTH(windowRect) + 1, RECT_HEIGHT(windowRect) + 1, swpFlags);
			::SetWindowPos(hWnd, nullptr, 0, 0, RECT_WIDTH(windowRect), RECT_HEIGHT(windowRect), swpFlags);
			break;
			}

			default:
			break;
			}

			if (!isWin10OrGreater()) {
			if (!isSystemBorderEnabled()) {
			switch (message) {
			case WM_NCUAHDRAWCAPTION:
			case WM_NCUAHDRAWFRAME: {
			@@ -1472,11 +1957,7 @@
			// window activation state change.
			*result = ::DefWindowProcW(hWnd, WM_NCACTIVATE, wParam, -1);
			} else {
			if (wParam) {
			*result = FALSE;
			} else {
			*result = TRUE;
			}
			*result = TRUE;
			}
			return true;
			}
			@@ -1593,9 +2074,25 @@
			// implement an elaborate client-area preservation technique, and
			// simply return 0, which means "preserve the entire old client area
			// and align it with the upper-left corner of our new client area".

			const auto clientRect = wParam ? &(reinterpret_cast<LPNCCALCSIZE_PARAMS>(lParam))->rgrc[0]
			: reinterpret_cast<LPRECT>(lParam);
			if (isWin10OrGreater()) {
			[[maybe_unused]] const auto &flickerReducer = qScopeGuard([this]() {
			// When we receive this message, it means the window size has changed
			// already, and it seems this message always come before any client
			// area size notifications (eg. WM_WINDOWPOSCHANGED and WM_SIZE). Let
			// D3D/VK paint immediately to let user see the latest result as soon
			// as possible.
			const auto &isTargetSurface = [](const QSurface::SurfaceType st) {
			return st != QSurface::RasterSurface && st != QSurface::OpenGLSurface &&
			st != QSurface::RasterGLSurface && st != QSurface::OpenVGSurface;
			};
			if (m_windowHandle && isTargetSurface(m_windowHandle->surfaceType()) &&
			isDwmCompositionEnabled() && DynamicApis::instance().pDwmFlush) {
			DynamicApis::instance().pDwmFlush();
			}
			});
			if (isSystemBorderEnabled()) {
			// Store the original top margin before the default window procedure applies the
			// default frame.
			const LONG originalTop = clientRect->top;
			@@ -1607,9 +2104,9 @@
			// that's also how most applications customize their title bars on Windows. It's
			// totally OK but since we want to preserve as much original frame as possible,
			// we can't use that solution.
			const LRESULT hitTestResult = ::DefWindowProcW(hWnd, WM_NCCALCSIZE, wParam, lParam);
			if ((hitTestResult != HTERROR) && (hitTestResult != HTNOWHERE)) {
			*result = hitTestResult;
			const LRESULT originalResult = ::DefWindowProcW(hWnd, WM_NCCALCSIZE, wParam, lParam);
			if (originalResult != 0) {
			*result = originalResult;
			return true;
			}
			// Re-apply the original top from before the size of the default frame was
			@@ -1622,7 +2119,8 @@
			// technique to bring the top border back.
			clientRect->top = originalTop;
			}
			const bool max = IsMaximized(hWnd);

			const bool max = isMaximized(hWnd);
			const bool full = isFullScreen(hWnd);
			// We don't need this correction when we're fullscreen. We will
			// have the WS_POPUP size, so we don't have to worry about
			@@ -1636,7 +2134,7 @@
			// a window when it's maximized unless you restore it).
			const quint32 frameSize = getResizeBorderThickness(hWnd);
			clientRect->top += frameSize;
			if (!isWin10OrGreater()) {
			if (!isSystemBorderEnabled()) {
			clientRect->bottom -= frameSize;
			clientRect->left += frameSize;
			clientRect->right -= frameSize;
			@@ -1715,8 +2213,6 @@
			}
			}
			}
			// 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.
			@@ -1727,7 +2223,10 @@
			// of the upper-left non-client area. It's confirmed that this issue exists
			// from Windows 7 to Windows 10. Not tested on Windows 11 yet. Don't know
			// whether it exists on Windows XP to Windows Vista or not.
			*result = wParam ? WVR_REDRAW : FALSE;

			// https://github.com/chromium/chromium/blob/5d297da3cf2a642e9ace2b23fed097370bc70814/ui/views/win/hwnd_message_handler.cc#L2330
			// Do not return WVR_REDRAW otherwise child HWNDs will be mispositioned.
			*result = FALSE;
			return true;
			}

			@@ -1737,12 +2236,13 @@
			return {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
			};
			const auto getNativeGlobalPosFromKeyboard = [hWnd]() -> POINT {
			const bool maxOrFull = IsMaximized(hWnd) \|\| isFullScreen(hWnd);
			const bool maxOrFull = isMaximized(hWnd) \|\| isFullScreen(hWnd);
			const quint32 frameSize = getResizeBorderThickness(hWnd);
			const quint32 horizontalOffset = ((maxOrFull \|\| !isWin10OrGreater()) ? 0 : frameSize);
			const quint32 horizontalOffset =
			((maxOrFull \|\| !isSystemBorderEnabled()) ? 0 : frameSize);
			const auto verticalOffset = [hWnd, maxOrFull, frameSize]() -> quint32 {
			const quint32 titleBarHeight = getTitleBarHeight(hWnd);
			if (!isWin10OrGreater()) {
			if (!isSystemBorderEnabled()) {
			return titleBarHeight;
			}
			if (isWin11OrGreater()) {
			@@ -1764,12 +2264,16 @@
			bool shouldShowSystemMenu = false;
			bool broughtByKeyboard = false;
			POINT nativeGlobalPos{};

			switch (message) {
			case WM_RBUTTONUP: {
			const POINT nativeLocalPos = getNativePosFromMouse();
			const QPoint qtScenePos =
			QHighDpi::fromNativeLocalPosition(point2qpoint(nativeLocalPos), m_windowHandle);
			if (isInTitleBarDraggableArea(qtScenePos)) {
			const QPoint qtScenePos = QHighDpi::fromNativeLocalPosition(
			point2qpoint(nativeLocalPos), m_windowHandle.data());
			WindowAgentBase::SystemButton sysButtonType = WindowAgentBase::Unknown;
			if (isInTitleBarDraggableArea(qtScenePos) \|\|
			(isInSystemButtons(qtScenePos, &sysButtonType) &&
			sysButtonType == WindowAgentBase::WindowIcon)) {
			shouldShowSystemMenu = true;
			nativeGlobalPos = nativeLocalPos;
			::ClientToScreen(hWnd, &nativeGlobalPos);
			@@ -1785,10 +2289,20 @@
			}
			case WM_SYSCOMMAND: {
			const WPARAM filteredWParam = (wParam & 0xFFF0);
			if ((filteredWParam == SC_KEYMENU) && (lParam == VK_SPACE)) {
			shouldShowSystemMenu = true;
			broughtByKeyboard = true;
			nativeGlobalPos = getNativeGlobalPosFromKeyboard();
			switch (filteredWParam) {
			case SC_MOUSEMENU:
			shouldShowSystemMenu = true;
			nativeGlobalPos = getNativeGlobalPosFromKeyboard();
			break;
			case SC_KEYMENU:
			if (lParam == VK_SPACE) {
			shouldShowSystemMenu = true;
			broughtByKeyboard = true;
			nativeGlobalPos = getNativeGlobalPosFromKeyboard();
			}
			break;
			default:
			break;
			}
			break;
			}
			@@ -1807,8 +2321,86 @@
			break;
			}
			if (shouldShowSystemMenu) {
			showSystemMenu2(hWnd, nativeGlobalPos, broughtByKeyboard,
			m_delegate->isHostSizeFixed(m_host));
			static HHOOK mouseHook = nullptr;
			static std::optional<POINT> mouseClickPos;
			static bool mouseDoubleClicked = false;
			bool mouseHookedLocal = false;

			// The menu is triggered by a click on icon button
			if (iconButtonClickTime > 0) {
			POINT menuPos{0, static_cast<LONG>(getTitleBarHeight(hWnd))};
			if (const auto tb = titleBar()) {
			auto titleBarHeight = qreal(m_delegate->mapGeometryToScene(tb).height());
			titleBarHeight *= m_windowHandle->devicePixelRatio();
			menuPos.y = qRound(titleBarHeight);
			}
			::ClientToScreen(hWnd, &menuPos);
			nativeGlobalPos = menuPos;

			// Install mouse hook
			if (!mouseHook) {
			mouseHook = ::SetWindowsHookExW(
			WH_MOUSE,
			[](int nCode, WPARAM wParam, LPARAM lParam) -> LRESULT {
			if (nCode >= 0) {
			switch (wParam) {
			case WM_LBUTTONDBLCLK:
			mouseDoubleClicked = true;
			Q_FALLTHROUGH();

			// case WM_POINTERDOWN:

			case WM_LBUTTONDOWN: {
			auto pMouseStruct =
			reinterpret_cast<MOUSEHOOKSTRUCT *>(lParam);
			if (pMouseStruct) {
			mouseClickPos = pMouseStruct->pt;
			}
			break;
			}
			default:
			break;
			}
			}
			return ::CallNextHookEx(nullptr, nCode, wParam, lParam);
			},
			nullptr, ::GetCurrentThreadId());
			mouseHookedLocal = true;
			}
			}

			bool res =
			showSystemMenu_sys(hWnd, nativeGlobalPos, broughtByKeyboard, isHostSizeFixed());

			// Uninstall mouse hook and check if it's a double-click
			if (mouseHookedLocal) {
			::UnhookWindowsHookEx(mouseHook);

			// Emulate the Windows icon button's behavior
			if (!res && mouseClickPos.has_value()) {
			POINT nativeLocalPos = mouseClickPos.value();
			::ScreenToClient(hWnd, &nativeLocalPos);
			QPoint qtScenePos = QHighDpi::fromNativeLocalPosition(
			point2qpoint(nativeLocalPos), m_windowHandle.data());
			WindowAgentBase::SystemButton sysButtonType = WindowAgentBase::Unknown;
			if (isInSystemButtons(qtScenePos, &sysButtonType) &&
			sysButtonType == WindowAgentBase::WindowIcon) {
			iconButtonClickLevel \|= IconButtonClicked;
			if (::GetTickCount64() - iconButtonClickTime <= ::GetDoubleClickTime()) {
			iconButtonClickLevel \|= IconButtonTriggersClose;
			}
			}
			}

			if (mouseDoubleClicked) {
			iconButtonClickLevel \|= IconButtonDoubleClicked;
			}

			mouseHook = nullptr;
			mouseClickPos.reset();
			mouseDoubleClicked = false;
			}

			// 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