sola/qwindowkit.git

			@@ -1,15 +1,16 @@
			#include "win32windowcontext_p.h"
			#include "qwkcoreglobal_p.h"

			#include <optional>

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

			#include <QtCore/private/qsystemlibrary_p.h>
			#include <QtGui/private/qhighdpiscaling_p.h>
			#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
			# include <QtGui/private/qguiapplication_p.h>
			@@ -21,181 +22,43 @@
			# include <QtGui/qpa/qplatformwindow_p.h>
			#endif

			#include <shellscalingapi.h>
			#include <dwmapi.h>
			#include <timeapi.h>
			#include <QWKCore/qwkconfig.h>

			Q_DECLARE_METATYPE(QMargins)
			#include "qwkglobal_p.h"
			#include "qwkwindowsextra_p.h"

			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 quint8 kAutoHideTaskBarThickness = 2;

			using WndProcHash = QHash<HWND, Win32WindowContext *>; // hWnd -> context
			QWK_USED static constexpr const struct {
			const uint32_t activeLight = MAKE_RGBA_COLOR(110, 110, 110, 255); // #6E6E6E
			const uint32_t activeDark = MAKE_RGBA_COLOR(51, 51, 51, 255); // #333333
			const uint32_t inactiveLight = MAKE_RGBA_COLOR(167, 167, 167, 255); // #A7A7A7
			const uint32_t inactiveDark = MAKE_RGBA_COLOR(61, 61, 62, 255); // #3D3D3E
			} kWindowsColorSet;

			// 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;

			static struct QWK_Hook {
			QWK_Hook() {
			qApp->setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
			}
			} g_hook{};
			static inline bool
			#if !QWINDOWKIT_CONFIG(ENABLE_WINDOWS_SYSTEM_BORDER)
			constexpr
			#endif

			struct DynamicApis {
			decltype(&::DwmFlush) pDwmFlush = nullptr;
			decltype(&::DwmIsCompositionEnabled) pDwmIsCompositionEnabled = nullptr;
			decltype(&::DwmGetCompositionTimingInfo) pDwmGetCompositionTimingInfo = nullptr;
			decltype(&::GetDpiForWindow) pGetDpiForWindow = nullptr;
			decltype(&::GetSystemMetricsForDpi) pGetSystemMetricsForDpi = nullptr;
			decltype(&::GetDpiForMonitor) pGetDpiForMonitor = nullptr;
			decltype(&::timeGetDevCaps) ptimeGetDevCaps = nullptr;
			decltype(&::timeBeginPeriod) ptimeBeginPeriod = nullptr;
			decltype(&::timeEndPeriod) ptimeEndPeriod = nullptr;

			DynamicApis() {
			QSystemLibrary user32(QStringLiteral("user32.dll"));
			pGetDpiForWindow =
			reinterpret_cast<decltype(pGetDpiForWindow)>(user32.resolve("GetDpiForWindow"));
			pGetSystemMetricsForDpi = reinterpret_cast<decltype(pGetSystemMetricsForDpi)>(
			user32.resolve("GetSystemMetricsForDpi"));

			QSystemLibrary shcore(QStringLiteral("shcore.dll"));
			pGetDpiForMonitor =
			reinterpret_cast<decltype(pGetDpiForMonitor)>(shcore.resolve("GetDpiForMonitor"));

			QSystemLibrary dwmapi(QStringLiteral("dwmapi.dll"));
			pDwmFlush = reinterpret_cast<decltype(pDwmFlush)>(dwmapi.resolve("DwmFlush"));
			pDwmIsCompositionEnabled = reinterpret_cast<decltype(pDwmIsCompositionEnabled)>(
			dwmapi.resolve("DwmIsCompositionEnabled"));
			pDwmGetCompositionTimingInfo = reinterpret_cast<decltype(pDwmGetCompositionTimingInfo)>(dwmapi.resolve("DwmGetCompositionTimingInfo"));

			QSystemLibrary winmm(QStringLiteral("winmm.dll"));
			ptimeGetDevCaps = reinterpret_cast<decltype(ptimeGetDevCaps)>(winmm.resolve("timeGetDevCaps"));
			ptimeBeginPeriod = reinterpret_cast<decltype(ptimeBeginPeriod)>(winmm.resolve("timeBeginPeriod"));
			ptimeEndPeriod = reinterpret_cast<decltype(ptimeEndPeriod)>(winmm.resolve("timeEndPeriod"));
			}

			~DynamicApis() = default;

			static const DynamicApis &instance() {
			static const DynamicApis inst{};
			return inst;
			}

			private:
			Q_DISABLE_COPY_MOVE(DynamicApis)
			};

			static inline constexpr bool operator==(const POINT &lhs, const POINT &rhs) noexcept {
			return ((lhs.x == rhs.x) && (lhs.y == rhs.y));
			}

			static inline constexpr bool operator!=(const POINT &lhs, const POINT &rhs) noexcept {
			return !operator==(lhs, rhs);
			}

			static inline constexpr bool operator==(const SIZE &lhs, const SIZE &rhs) noexcept {
			return ((lhs.cx == rhs.cx) && (lhs.cy == rhs.cy));
			}

			static inline constexpr bool operator!=(const SIZE &lhs, const SIZE &rhs) noexcept {
			return !operator==(lhs, rhs);
			}

			static inline constexpr bool operator>(const SIZE &lhs, const SIZE &rhs) noexcept {
			return ((lhs.cx * lhs.cy) > (rhs.cx * rhs.cy));
			}

			static inline constexpr bool operator>=(const SIZE &lhs, const SIZE &rhs) noexcept {
			return (operator>(lhs, rhs) \|\| operator==(lhs, rhs));
			}

			static inline constexpr bool operator<(const SIZE &lhs, const SIZE &rhs) noexcept {
			return (operator!=(lhs, rhs) && !operator>(lhs, rhs));
			}

			static inline constexpr bool operator<=(const SIZE &lhs, const SIZE &rhs) noexcept {
			return (operator<(lhs, rhs) \|\| operator==(lhs, rhs));
			}

			static inline constexpr bool operator==(const RECT &lhs, const RECT &rhs) noexcept {
			return ((lhs.left == rhs.left) && (lhs.top == rhs.top) && (lhs.right == rhs.right) &&
			(lhs.bottom == rhs.bottom));
			}

			static inline constexpr bool operator!=(const RECT &lhs, const RECT &rhs) noexcept {
			return !operator==(lhs, rhs);
			}

			static inline constexpr QPoint point2qpoint(const POINT &point) {
			return QPoint{int(point.x), int(point.y)};
			}

			static inline constexpr POINT qpoint2point(const QPoint &point) {
			return POINT{LONG(point.x()), LONG(point.y())};
			}

			static inline constexpr QSize size2qsize(const SIZE &size) {
			return QSize{int(size.cx), int(size.cy)};
			}

			static inline constexpr SIZE qsize2size(const QSize &size) {
			return SIZE{LONG(size.width()), LONG(size.height())};
			}

			static inline constexpr QRect rect2qrect(const RECT &rect) {
			return QRect{
			QPoint{int(rect.left), int(rect.top) },
			QSize{int(RECT_WIDTH(rect)), int(RECT_HEIGHT(rect))}
			};
			}

			static inline constexpr RECT qrect2rect(const QRect &qrect) {
			return RECT{LONG(qrect.left()), LONG(qrect.top()), LONG(qrect.right()),
			LONG(qrect.bottom())};
			}

			static inline /constexpr/ QString hwnd2str(const WId windowId) {
			// NULL handle is allowed here.
			return QLatin1String("0x") +
			QString::number(windowId, 16).toUpper().rightJustified(8, u'0');
			}

			static inline /constexpr/ QString hwnd2str(HWND hwnd) {
			// NULL handle is allowed here.
			return hwnd2str(reinterpret_cast<WId>(hwnd));
			}

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

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

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

			static inline bool isDwmCompositionEnabled() {
			if (isWin8OrGreater()) {
			return true;
			}
			const DynamicApis &apis = DynamicApis::instance();
			if (!apis.pDwmIsCompositionEnabled) {
			return false;
			}
			BOOL enabled = FALSE;
			return SUCCEEDED(apis.pDwmIsCompositionEnabled(&enabled)) && enabled;
			isSystemBorderEnabled() {
			return
			#if QWINDOWKIT_CONFIG(ENABLE_WINDOWS_SYSTEM_BORDER)
			isWin10OrGreater()
			#else
			false
			#endif
			;
			}

			static inline void triggerFrameChange(HWND hwnd) {
			@@ -204,65 +67,13 @@
			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{USER_DEFAULT_SCREEN_DPI};
			UINT dpiY{USER_DEFAULT_SCREEN_DPI};
			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 getResizeBorderThickness(HWND hwnd) {
			const DynamicApis &apis = DynamicApis::instance();
			if (apis.pGetSystemMetricsForDpi) {
			const quint32 dpi = getDpiForWindow(hwnd);
			return apis.pGetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) +
			apis.pGetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi);
			} else {
			return ::GetSystemMetrics(SM_CXSIZEFRAME) + ::GetSystemMetrics(SM_CXPADDEDBORDER);
			}
			}

			static inline quint32 getTitleBarHeight(HWND hwnd) {
			const auto captionHeight = [hwnd]() -> int {
			const DynamicApis &apis = DynamicApis::instance();
			if (apis.pGetSystemMetricsForDpi) {
			const quint32 dpi = getDpiForWindow(hwnd);
			return apis.pGetSystemMetricsForDpi(SM_CYCAPTION, dpi);
			} else {
			return ::GetSystemMetrics(SM_CYCAPTION);
			}
			}();
			return captionHeight + getResizeBorderThickness(hwnd);
			}

			static inline void updateInternalWindowFrameMargins(HWND hwnd, QWindow *window) {
			const auto margins = [hwnd]() -> QMargins {
			const int titleBarHeight = getTitleBarHeight(hwnd);
			if (isWin10OrGreater()) {
			return {0, -titleBarHeight, 0, 0};
			} else {
			const int frameSize = getResizeBorderThickness(hwnd);
			return {-frameSize, -titleBarHeight, -frameSize, -frameSize};
			}
			}();
			static void setInternalWindowFrameMargins(QWindow *window, const QMargins &margins) {
			const QVariant marginsVar = QVariant::fromValue(margins);
			window->setProperty("_q_windowsCustomMargins", marginsVar);
			#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);
			}
			}
			@@ -282,16 +93,83 @@
			monitorInfo.cbSize = sizeof(monitorInfo);
			::GetMonitorInfoW(monitor, &monitorInfo);
			return monitorInfo;
			};
			}

			static inline void moveToDesktopCenter(HWND hwnd) {
			const auto monitorInfo = getMonitorForWindow(hwnd);
			static inline void moveWindowToDesktopCenter(HWND hwnd) {
			MONITORINFOEXW monitorInfo = getMonitorForWindow(hwnd);
			RECT windowRect{};
			::GetWindowRect(hwnd, &windowRect);
			const auto newX = (RECT_WIDTH(monitorInfo.rcMonitor) - RECT_WIDTH(windowRect)) / 2;
			const auto newY = (RECT_HEIGHT(monitorInfo.rcMonitor) - RECT_HEIGHT(windowRect)) / 2;
			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;
			// We are in the same monitor, nothing to adjust here.
			if (currentMonitorRect == activeMonitorRect) {
			return;
			}
			RECT currentWindowRect{};
			::GetWindowRect(hwnd, &currentWindowRect);
			auto newWindowX =
			activeMonitorRect.left + (currentWindowRect.left - currentMonitorRect.left);
			auto newWindowY = activeMonitorRect.top + (currentWindowRect.top - currentMonitorRect.top);
			::SetWindowPos(hwnd, nullptr, newWindowX, newWindowY, RECT_WIDTH(currentWindowRect),
			RECT_HEIGHT(currentWindowRect),
			SWP_NOACTIVATE \| SWP_NOSIZE \| SWP_NOZORDER \| SWP_NOOWNERZORDER);
			}

			static inline void bringWindowToFront(HWND hwnd) {
			HWND oldForegroundWindow = ::GetForegroundWindow();
			if (!oldForegroundWindow) {
			// The foreground window can be NULL, it's not an API error.
			return;
			}
			MONITORINFOEXW activeMonitor = getMonitorForWindow(oldForegroundWindow);
			// We need to show the window first, otherwise we won't be able to bring it to front.
			if (!::IsWindowVisible(hwnd)) {
			::ShowWindow(hwnd, SW_SHOW);
			}
			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.
			moveWindowToMonitor(hwnd, activeMonitor);
			// When the window is restored, it will always become the foreground window.
			// So return early here, we don't need the following code to bring it to front.
			return;
			}
			// OK, our window is not minimized, so now we will try to bring it to front manually.
			// First try to send a message to the current foreground window to check whether
			// it is currently hanging or not.
			if (!::SendMessageTimeoutW(oldForegroundWindow, WM_NULL, 0, 0,
			SMTO_BLOCK \| SMTO_ABORTIFHUNG \| SMTO_NOTIMEOUTIFNOTHUNG, 1000,
			nullptr)) {
			// The foreground window hangs, can't activate current window.
			return;
			}
			DWORD windowThreadProcessId = ::GetWindowThreadProcessId(oldForegroundWindow, nullptr);
			DWORD currentThreadId = ::GetCurrentThreadId();
			// We won't be able to change a window's Z order if it's not our own window,
			// so we use this small technique to pretend the foreground window is ours.
			::AttachThreadInput(windowThreadProcessId, currentThreadId, TRUE);

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

			::BringWindowToTop(hwnd);
			// Activate the window too. This will force us to the virtual desktop this
			// window is on, if it's on another virtual desktop.
			::SetActiveWindow(hwnd);
			// Throw us on the active monitor.
			moveWindowToMonitor(hwnd, activeMonitor);
			}

			static inline bool isFullScreen(HWND hwnd) {
			@@ -308,12 +186,15 @@
			::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 syncPaintEventWithDwm() {
			static void syncPaintEventWithDwm() {
			// No need to sync with DWM if DWM composition is disabled.
			if (!isDwmCompositionEnabled()) {
			return;
			@@ -358,6 +239,73 @@
			apis.ptimeEndPeriod(ms_granularity);
			}

			static void showSystemMenu2(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;
			}

			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)));
			// 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)));
			::EnableMenuItem(hMenu, SC_MINIMIZE, (MF_BYCOMMAND \| MFS_ENABLED));
			::EnableMenuItem(hMenu, SC_SIZE,
			(MF_BYCOMMAND \| ((maxOrFull \|\| fixedSize) ? MFS_DISABLED : MFS_ENABLED)));
			::EnableMenuItem(hMenu, SC_MOVE, (MF_BYCOMMAND \| (maxOrFull ? 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.
			UINT defaultItemId = UINT_MAX;
			if (isWin11OrGreater()) {
			if (maxOrFull) {
			defaultItemId = SC_RESTORE;
			} else {
			defaultItemId = SC_MAXIMIZE;
			}
			}
			if (defaultItemId == UINT_MAX) {
			defaultItemId = SC_CLOSE;
			}
			::SetMenuDefaultItem(hMenu, defaultItemId, FALSE);

			// 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);

			// 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) {
			switch (hitTestResult) {
			case HTCLIENT:
			@@ -382,7 +330,8 @@
			case HTBORDER:
			return Win32WindowContext::FixedBorder;
			default:
			break; // unreachable
			// unreachable
			break;
			}
			return Win32WindowContext::Outside;
			}
			@@ -426,14 +375,11 @@
			// DefWindowProc(). Consequently, we have to add a global native filter that forwards the result
			// of the hook function, telling Qt whether we have filtered the events before. Since Qt only
			// handles Windows window messages in the main thread, it is safe to do so.
			class WindowsNativeEventFilter : public QAbstractNativeEventFilter {
			class WindowsNativeEventFilter : public AppNativeEventFilter {
			public:
			bool nativeEventFilter(const QByteArray &eventType, void *message,
			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.
			@@ -443,11 +389,11 @@

			// 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.
			// have to process it after Qt acquires the initial data.
			auto msg = static_cast<const MSG *>(message);
			if (msg->message == WM_NCCALCSIZE && orgLastMessageContext) {
			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;
			@@ -460,12 +406,16 @@
			static Win32WindowContext *lastMessageContext;

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

			static inline void uninstall() {
			removeNativeEventFilter(instance);
			if (!instance) {
			return;
			}
			delete instance;
			instance = nullptr;
			}
			@@ -543,47 +493,34 @@
			// 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);
			}

			Win32WindowContext::Win32WindowContext() : AbstractWindowContext() {
			}

			Win32WindowContext::~Win32WindowContext() {
			// Remove window handle mapping
			if (auto hWnd = reinterpret_cast<HWND>(windowId); hWnd) {
			g_wndProcHash->remove(hWnd);

			// Remove event filter if the all windows has been destroyed
			if (g_wndProcHash->empty()) {
			WindowsNativeEventFilter::uninstall();
			static inline void addManagedWindow(QWindow window, HWND hWnd, Win32WindowContext ctx) {
			const auto margins = [hWnd]() -> QMargins {
			const auto titleBarHeight = int(getTitleBarHeight(hWnd));
			if (isSystemBorderEnabled()) {
			return {0, -titleBarHeight, 0, 0};
			} else {
			const auto frameSize = int(getResizeBorderThickness(hWnd));
			return {-frameSize, -titleBarHeight, -frameSize, -frameSize};
			}
			}
			}

			bool Win32WindowContext::setupHost() {
			// Install window hook
			auto winId = m_windowHandle->winId();
			auto hWnd = reinterpret_cast<HWND>(winId);
			}();

			// Inform Qt we want and have set custom margins
			updateInternalWindowFrameMargins(hWnd, m_windowHandle);
			setInternalWindowFrameMargins(window, margins);

			// Store original window proc
			if (!g_qtWindowProc) {
			@@ -594,17 +531,217 @@
			::SetWindowLongPtrW(hWnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(QWKHookedWndProc));

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

			// Cache window ID
			windowId = winId;
			WindowsNativeEventFilter::install();

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

			return true;
			static inline void removeManagedWindow(HWND hWnd) {
			// Remove window handle mapping
			if (!g_wndProcHash->remove(hWnd))
			return;

			// Remove event filter if the all windows has been destroyed
			if (g_wndProcHash->empty()) {
			WindowsNativeEventFilter::uninstall();
			}
			}

			Win32WindowContext::Win32WindowContext() : AbstractWindowContext() {
			}

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

			QString Win32WindowContext::key() const {
			return QStringLiteral("win32");
			}

			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)
			return;
			const auto hwnd = reinterpret_cast<HWND>(windowId);
			bringWindowToFront(hwnd);
			return;
			}

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

			case DefaultColorsHook: {
			auto &map = static_cast<QMap<QString, QColor> >(data);
			map.clear();
			map.insert(QStringLiteral("activeLight"), kWindowsColorSet.activeLight);
			map.insert(QStringLiteral("activeDark"), kWindowsColorSet.activeDark);
			map.insert(QStringLiteral("inactiveLight"), kWindowsColorSet.inactiveLight);
			map.insert(QStringLiteral("inactiveDark"), kWindowsColorSet.inactiveDark);
			return;
			}

			case DrawWindows10BorderHook: {
			#if QWINDOWKIT_CONFIG(ENABLE_WINDOWS_SYSTEM_BORDER)
			if (!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);

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

			const bool dark = isDarkThemeActive() && isDarkWindowFrameEnabled(hwnd);
			if (m_delegate->isWindowActive(m_host)) {
			if (isWindowFrameBorderColorized()) {
			pen.setColor(getAccentColor());
			} else {
			static QColor frameBorderActiveColorLight(kWindowsColorSet.activeLight);
			static QColor frameBorderActiveColorDark(kWindowsColorSet.activeDark);
			pen.setColor(dark ? frameBorderActiveColorDark
			: frameBorderActiveColorLight);
			}
			} else {
			static QColor frameBorderInactiveColorLight(kWindowsColorSet.inactiveLight);
			static QColor frameBorderInactiveColorDark(kWindowsColorSet.inactiveDark);
			pen.setColor(dark ? frameBorderInactiveColorDark
			: frameBorderInactiveColorLight);
			}
			painter.save();

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

			painter.setPen(pen);
			painter.drawLine(QLine{
			QPoint{0, 0},
			QPoint{m_windowHandle->width(), 0}
			});
			painter.restore();
			#endif
			return;
			}

			case DrawWindows10BorderHook2: {
			#if QWINDOWKIT_CONFIG(ENABLE_WINDOWS_SYSTEM_BORDER)
			if (!m_windowHandle)
			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>(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);
			#endif
			return;
			}

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

			QVariant Win32WindowContext::windowAttribute(const QString &key) const {
			if (key == QStringLiteral("title-bar-rect")) {
			if (!m_windowHandle)
			return {};

			auto hwnd = reinterpret_cast<HWND>(windowId);
			RECT frame{};
			::AdjustWindowRectExForDpi(&frame, ::GetWindowLongPtrW(hwnd, GWL_STYLE), FALSE, 0,
			getDpiForWindow(hwnd));
			return QVariant::fromValue(rect2qrect(frame));
			}

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

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

			return AbstractWindowContext::windowAttribute(key);
			}

			void Win32WindowContext::winIdChanged() {
			// If the original window id is valid, remove all resources related
			if (windowId) {
			removeManagedWindow(reinterpret_cast<HWND>(windowId));
			windowId = 0;
			}

			if (!m_windowHandle) {
			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));
			setWindowAttribute(QStringLiteral("extra-margins"), margins);
			}

			{
			auto style = ::GetWindowLongPtrW(hWnd, GWL_STYLE);
			#if QWINDOWKIT_CONFIG(ENABLE_WINDOWS_SYSTEM_BORDER)
			::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,
			@@ -639,14 +776,221 @@
			return true;
			}

			// Whether to show system menu
			if (systemMenuHandler(hWnd, message, wParam, lParam, result)) {
			return true;
			}

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

			static constexpr const auto kMessageTag = WPARAM(0x97CCEA99);
			bool Win32WindowContext::windowAttributeChanged(const QString &key, const QVariant &attribute,
			const QVariant &oldAttribute) {
			Q_UNUSED(oldAttribute)

			static inline constexpr bool isTaggedMessage(WPARAM wParam) {
			return (wParam == kMessageTag);
			const auto hwnd = reinterpret_cast<HWND>(m_windowHandle->winId());
			const DynamicApis &apis = DynamicApis::instance();
			static constexpr const MARGINS extendedMargins = {-1, -1, -1, -1};
			const auto &restoreMargins = [this, &apis, hwnd]() {
			auto margins = qmargins2margins(
			m_windowAttributes.value(QStringLiteral("extra-margins")).value<QMargins>());
			apis.pDwmExtendFrameIntoClientArea(hwnd, &margins);
			};

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

			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);
			}
			for (const auto attr : {
			_DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1,
			_DWMWA_USE_IMMERSIVE_DARK_MODE,
			}) {
			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()) {
			// We need to extend the window frame into the whole client area to be able
			// to see the blurred window background.
			apis.pDwmExtendFrameIntoClientArea(hwnd, &extendedMargins);
			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();
			}
			return true;
			}

			if (key == QStringLiteral("mica-alt")) {
			if (!isWin1122H2OrGreater()) {
			return false;
			}
			if (attribute.toBool()) {
			// We need to extend the window frame into the whole client area to be able
			// to see the blurred window background.
			apis.pDwmExtendFrameIntoClientArea(hwnd, &extendedMargins);
			// 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();
			}
			return true;
			}

			if (key == QStringLiteral("acrylic-material")) {
			if (!isWin11OrGreater()) {
			return false;
			}
			if (attribute.toBool()) {
			// We need to extend the window frame into the whole client area to be able
			// to see the blurred window background.
			apis.pDwmExtendFrameIntoClientArea(hwnd, &extendedMargins);

			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();
			}
			return true;
			}

			if (key == QStringLiteral("dwm-blur")) {
			// TODO: Optimize
			// Currently not available!!!
			if (attribute.toBool()) {
			// We need to extend the window frame into the whole client area to be able
			// to see the blurred window background.
			apis.pDwmExtendFrameIntoClientArea(hwnd, &extendedMargins);
			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);
			}
			restoreMargins();
			}
			return true;
			}
			return false;
			}

			QWK_USED static constexpr const struct {
			const WPARAM wParam = MAKEWPARAM(44500, 61897);
			const LPARAM lParam = MAKELPARAM(62662, 44982); // Not used. Reserve for future use.
			} kMessageTag;

			static inline quint64 getKeyState() {
			quint64 result = 0;
			@@ -686,7 +1030,7 @@
			// wParam is always ignored in mouse leave messages, but here we
			// give them a special tag to be able to distinguish which messages
			// are sent by ourselves.
			return kMessageTag;
			return kMessageTag.wParam;
			}
			const quint64 keyState = getKeyState();
			if ((myMsg >= WM_NCXBUTTONDOWN) && (myMsg <= WM_NCXBUTTONDBLCLK)) {
			@@ -764,6 +1108,7 @@
			SEND_MESSAGE(hWnd, WM_MOUSELEAVE, wParamNew, lParamNew);
			break;
			default:
			// unreachable
			break;
			}

			@@ -786,7 +1131,7 @@
			LPARAM lParam, LRESULT *result) {
			switch (message) {
			case WM_MOUSELEAVE: {
			if (!isTaggedMessage(wParam)) {
			if (wParam != kMessageTag.wParam) {
			// Qt will call TrackMouseEvent() to get the WM_MOUSELEAVE message when it
			// receives WM_MOUSEMOVE messages, and since we are converting every
			// WM_NCMOUSEMOVE message to WM_MOUSEMOVE message and send it back to the window
			@@ -798,9 +1143,9 @@
			DWORD dwScreenPos = ::GetMessagePos();
			POINT screenPoint{GET_X_LPARAM(dwScreenPos), GET_Y_LPARAM(dwScreenPos)};
			::ScreenToClient(hWnd, &screenPoint);
			QPoint qtScenePos =
			QHighDpi::fromNativeLocalPosition(QPoint{screenPoint.x, screenPoint.y}, m_windowHandle);
			auto dummy = CoreWindowAgent::Unknown;
			QPoint qtScenePos = QHighDpi::fromNativeLocalPosition(point2qpoint(screenPoint),
			m_windowHandle);
			auto dummy = WindowAgentBase::Unknown;
			if (isInSystemButtons(qtScenePos, &dummy)) {
			// We must record whether the last WM_MOUSELEAVE was filtered, because if
			// Qt does not receive this message it will not call TrackMouseEvent()
			@@ -847,7 +1192,54 @@
			const WindowPart currentWindowPart = lastHitTestResult;
			if (message == WM_NCMOUSEMOVE) {
			if (currentWindowPart != WindowPart::ChromeButton) {
			m_delegate->resetQtGrabbedControl();
			// 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
			// widget. At this time, no other widgets will accept the mouse event until
			// QWidgetWindow receives the mouse release event, then set `qt_button_down`
			// to null.

			// Imagine the following situation, now the main window has a pop-up menu,
			// the focus is not on the main window, if we click outside the pop-up menu,
			// the menu will close, which seems to be completely fine. But if we close
			// the menu by clicking on the title bar draggable area, then other widgets
			// won't accept the mouse message afterwards.

			// Here's the reason.
			// When the mouse is placed in the draggable area of the title bar, there
			// are two situations.

			// 1. If the focus is on the main window, and the last result of
			// WM_NCHITTEST is HTCAPTION, the mouse click event in the title bar is
			// taken over by Windows and Qt does not receive the mouse click event.

			// 2. If the main window has a pop-up menu, it is completely different. When
			// the mouse is pressed on the title bar, Windows sends the WM_LBUTTONDOWN
			// message to the window plane of the pop-up menu, the menu is closed, but
			// Qt will continue to forward the event to the QWidget under the mouse, and
			// the event will be processed by QWidgetWindow, causing the title bar
			// widget to be implicitly grabbed. After the menu is closed, Windows
			// immediately sends WM_NCHITTEST, because the mouse is in the title bar
			// draggable area, the result is HTCAPTION, so when the mouse is released,
			// Windows sends WM_NCLBUTTONUP, which is a non-client message, and it
			// will be ignored by Qt. As a consequence, QWidgetWindow can't receive a
			// mouse release message in the client area, so the grab remains, and other
			// widgets cannot receive mouse events.

			// Since we didn't watch the menu window, we cannot capture any mouse
			// press events sent by Windows, so we cannot solve this problem by
			// recording mouse events. Fortunately, we found that the main window will
			// receive a WM_NCMOUSEMOVE message immediately after the menu is closed, so
			// we just manually send a mouse release event when this message arrives and
			// set qt_button_down to null. Don't worry, when receiving WM_NCMOUSEMOVE,
			// there shouldn't be any control in the state of being grabbed.

			// In the native window, although QWidgetWindow handles the forwarded mouse
			// press event when the menu is closed, since the native title bar is not a
			// QWidget, no widget will be grabbed, and `qt_button_down` remains empty,
			// the above problems would not arise.

			m_delegate->resetQtGrabbedControl(m_host);
			if (mouseLeaveBlocked) {
			emulateClientAreaMessage(hWnd, message, wParam, lParam,
			WM_NCMOUSELEAVE);
			@@ -909,7 +1301,9 @@
			// 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.
			m_delegate->resetQtGrabbedControl();

			// Why do we need to call this function here?
			m_delegate->resetQtGrabbedControl(m_host);
			}
			}
			break;
			@@ -929,13 +1323,14 @@
			// 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 == 0) {
			if (wParam && !lParam) {
			centered = true;
			moveToDesktopCenter(hWnd);
			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
			@@ -1017,7 +1412,6 @@
			// Terminal does, however, later I found that if we choose a proper
			// 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)); //
			});
			@@ -1031,14 +1425,14 @@
			auto clientWidth = RECT_WIDTH(clientRect);
			auto clientHeight = RECT_HEIGHT(clientRect);

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

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

			CoreWindowAgent::SystemButton sysButtonType = CoreWindowAgent::Unknown;
			WindowAgentBase::SystemButton sysButtonType = WindowAgentBase::Unknown;
			if (!isFixedSize && isInSystemButtons(qtScenePos, &sysButtonType)) {
			// Firstly, we set the hit test result to a default value to be able to detect
			// whether we have changed it or not afterwards.
			@@ -1048,22 +1442,31 @@
			// 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 quint8 kBorderSize = 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;
			}
			}
			}
			}
			@@ -1073,23 +1476,24 @@
			// exact role of our button. The Snap Layout feature introduced in Windows
			// 11 won't work without this.
			switch (sysButtonType) {
			case CoreWindowAgent::WindowIcon:
			case WindowAgentBase::WindowIcon:
			*result = HTSYSMENU;
			break;
			case CoreWindowAgent::Help:
			case WindowAgentBase::Help:
			*result = HTHELP;
			break;
			case CoreWindowAgent::Minimize:
			case WindowAgentBase::Minimize:
			*result = HTREDUCE;
			break;
			case CoreWindowAgent::Maximize:
			case WindowAgentBase::Maximize:
			*result = HTZOOM;
			break;
			case CoreWindowAgent::Close:
			case WindowAgentBase::Close:
			*result = HTCLOSE;
			break;
			default:
			break; // unreachable
			// unreachable
			break;
			}
			}
			if (*result == HTNOWHERE) {
			@@ -1108,7 +1512,7 @@
			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);
			@@ -1130,7 +1534,7 @@
			*result = (isTitleBar ? HTCAPTION : HTCLIENT);
			return true;
			}
			// At this point, we know that the cursor is inside the client area
			// At this point, we know that the cursor is inside the client area,
			// so it has to be either the little border at the top of our custom
			// 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
			@@ -1163,9 +1567,9 @@
			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
			@@ -1214,10 +1618,29 @@
			return true;
			}
			}

			case WM_WINDOWPOSCHANGING: {
			// ### FIXME: How does this problem happen and why is it solved?
			// When toggling the "Show theme color in title bar and window border" setting in
			// Windows Settings, or calling `DrawMenuBar()`, Windows sends a message of
			// WM_WINDOWPOSCHANGING with flags 0x37. If we do not process this message,
			// the client area as a whole will shift to the left, which looks very abnormal if
			// we don't repaint it. This exception disappears if we add SWP_NOCOPYBITS flag.
			// But I don't know what caused the problem, or why this would solve it.
			static constexpr const auto kBadWindowPosFlag =
			SWP_NOSIZE \| SWP_NOMOVE \| SWP_NOZORDER \| SWP_NOACTIVATE \| SWP_FRAMECHANGED;
			const auto windowPos = reinterpret_cast<LPWINDOWPOS>(lParam);
			if (windowPos->flags == kBadWindowPosFlag) {
			windowPos->flags \|= SWP_NOCOPYBITS;
			}
			break;
			}

			default:
			break;
			}
			if (!isWin10OrGreater()) {

			if (!isSystemBorderEnabled()) {
			switch (message) {
			case WM_NCUAHDRAWCAPTION:
			case WM_NCUAHDRAWFRAME: {
			@@ -1249,11 +1672,7 @@
			// window activation state change.
			*result = ::DefWindowProcW(hWnd, WM_NCACTIVATE, wParam, -1);
			} else {
			if (wParam) {
			*result = FALSE;
			} else {
			*result = TRUE;
			}
			*result = TRUE;
			}
			return true;
			}
			@@ -1283,6 +1702,7 @@
			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
			@@ -1371,7 +1791,7 @@
			// 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()) {
			if (isSystemBorderEnabled()) {
			// Store the original top margin before the default window procedure applies the
			// default frame.
			const LONG originalTop = clientRect->top;
			@@ -1398,6 +1818,7 @@
			// technique to bring the top border back.
			clientRect->top = originalTop;
			}

			const bool max = IsMaximized(hWnd);
			const bool full = isFullScreen(hWnd);
			// We don't need this correction when we're fullscreen. We will
			@@ -1412,7 +1833,7 @@
			// 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;
			@@ -1507,4 +1928,93 @@
			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 \|\| !isSystemBorderEnabled()) ? 0 : frameSize);
			const auto verticalOffset = [hWnd, maxOrFull, frameSize]() -> quint32 {
			const quint32 titleBarHeight = getTitleBarHeight(hWnd);
			if (!isSystemBorderEnabled()) {
			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(point2qpoint(nativeLocalPos), 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,
			m_delegate->isHostSizeFixed(m_host));
			// 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;
			}

			}