From a5d13e19dd7f6037e10b649c49805922ae5e0fa6 Mon Sep 17 00:00:00 2001
From: SineStriker <trueful@163.com>
Date: 周五, 22 12月 2023 17:04:29 +0800
Subject: [PATCH] Prepare to remove style support again

---
 src/core/contexts/cocoawindowcontext.mm |  579 +++++++++++++++++++++++++++++++++++----------------------
 1 files changed, 353 insertions(+), 226 deletions(-)

diff --git a/src/core/contexts/cocoawindowcontext.mm b/src/core/contexts/cocoawindowcontext.mm
index 66e57bf..949681d 100644
--- a/src/core/contexts/cocoawindowcontext.mm
+++ b/src/core/contexts/cocoawindowcontext.mm
@@ -1,271 +1,368 @@
 #include "cocoawindowcontext_p.h"
 
+#include <objc/runtime.h>
+#include <AppKit/AppKit.h>
+
+#include <QtGui/QGuiApplication>
+
+#include "qwkglobal_p.h"
+#include "systemwindow_p.h"
+
 namespace QWK {
 
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-static const struct QWK_Hook {
-    QWK_Hook() {
-        qputenv("QT_MAC_WANTS_LAYER", "1");
-    }
-} g_hook{};
-#endif
-
-class NSWindowProxy
-{
-    Q_DISABLE_COPY_MOVE(NSWindowProxy)
-
-public:
-    NSWindowProxy(NSWindow *macWindow)
-    {
-        if (instances.contains(macWindow)) {
-            return;
+    struct NSWindowProxy {
+        NSWindowProxy(NSWindow *macWindow) {
+            if (instances.contains(macWindow)) {
+                return;
+            }
+            nswindow = macWindow;
+            instances.insert(macWindow, this);
+            if (!windowClass) {
+                windowClass = [nswindow class];
+                replaceImplementations();
+            }
         }
-        nswindow = macWindow;
-        instances.insert(macWindow, this);
-        if (!windowClass) {
-            windowClass = [nswindow class];
-            replaceImplementations();
+
+        ~NSWindowProxy() {
+            instances.remove(nswindow);
+            if (instances.count() <= 0) {
+                restoreImplementations();
+                windowClass = nil;
+            }
+            nswindow = nil;
         }
-    }
 
-    ~NSWindowProxy() override
-    {
-        instances.remove(nswindow);
-        if (instances.count() <= 0) {
-            restoreImplementations();
-            windowClass = nil;
-        }
-        nswindow = nil;
-    }
+        void replaceImplementations() {
+            Method method = class_getInstanceMethod(windowClass, @selector(setStyleMask:));
+            oldSetStyleMask = reinterpret_cast<setStyleMaskPtr>(
+                method_setImplementation(method, reinterpret_cast<IMP>(setStyleMask)));
 
-public Q_SLOTS:
-    void replaceImplementations()
-    {
-        Method method = class_getInstanceMethod(windowClass, @selector(setStyleMask:));
-        Q_ASSERT(method);
-        oldSetStyleMask = reinterpret_cast<setStyleMaskPtr>(method_setImplementation(method, reinterpret_cast<IMP>(setStyleMask)));
-        Q_ASSERT(oldSetStyleMask);
-
-        method = class_getInstanceMethod(windowClass, @selector(setTitlebarAppearsTransparent:));
-        Q_ASSERT(method);
-        oldSetTitlebarAppearsTransparent = reinterpret_cast<setTitlebarAppearsTransparentPtr>(method_setImplementation(method, reinterpret_cast<IMP>(setTitlebarAppearsTransparent)));
-        Q_ASSERT(oldSetTitlebarAppearsTransparent);
+            method =
+                class_getInstanceMethod(windowClass, @selector(setTitlebarAppearsTransparent:));
+            oldSetTitlebarAppearsTransparent =
+                reinterpret_cast<setTitlebarAppearsTransparentPtr>(method_setImplementation(
+                    method, reinterpret_cast<IMP>(setTitlebarAppearsTransparent)));
 
 #if 0
-        method = class_getInstanceMethod(windowClass, @selector(canBecomeKeyWindow));
-        Q_ASSERT(method);
-        oldCanBecomeKeyWindow = reinterpret_cast<canBecomeKeyWindowPtr>(method_setImplementation(method, reinterpret_cast<IMP>(canBecomeKeyWindow)));
-        Q_ASSERT(oldCanBecomeKeyWindow);
+            method = class_getInstanceMethod(windowClass, @selector(canBecomeKeyWindow));
+            oldCanBecomeKeyWindow = reinterpret_cast<canBecomeKeyWindowPtr>(method_setImplementation(method, reinterpret_cast<IMP>(canBecomeKeyWindow)));
 
-        method = class_getInstanceMethod(windowClass, @selector(canBecomeMainWindow));
-        Q_ASSERT(method);
-        oldCanBecomeMainWindow = reinterpret_cast<canBecomeMainWindowPtr>(method_setImplementation(method, reinterpret_cast<IMP>(canBecomeMainWindow)));
-        Q_ASSERT(oldCanBecomeMainWindow);
+            method = class_getInstanceMethod(windowClass, @selector(canBecomeMainWindow));
+            oldCanBecomeMainWindow = reinterpret_cast<canBecomeMainWindowPtr>(method_setImplementation(method, reinterpret_cast<IMP>(canBecomeMainWindow)));
 #endif
 
-        method = class_getInstanceMethod(windowClass, @selector(sendEvent:));
-        Q_ASSERT(method);
-        oldSendEvent = reinterpret_cast<sendEventPtr>(method_setImplementation(method, reinterpret_cast<IMP>(sendEvent)));
-        Q_ASSERT(oldSendEvent);
-    }
+            method = class_getInstanceMethod(windowClass, @selector(sendEvent:));
+            oldSendEvent = reinterpret_cast<sendEventPtr>(
+                method_setImplementation(method, reinterpret_cast<IMP>(sendEvent)));
+        }
 
-    void restoreImplementations()
-    {
-        Method method = class_getInstanceMethod(windowClass, @selector(setStyleMask:));
-        Q_ASSERT(method);
-        method_setImplementation(method, reinterpret_cast<IMP>(oldSetStyleMask));
-        oldSetStyleMask = nil;
+        void restoreImplementations() {
+            Method method = class_getInstanceMethod(windowClass, @selector(setStyleMask:));
+            method_setImplementation(method, reinterpret_cast<IMP>(oldSetStyleMask));
+            oldSetStyleMask = nil;
 
-        method = class_getInstanceMethod(windowClass, @selector(setTitlebarAppearsTransparent:));
-        Q_ASSERT(method);
-        method_setImplementation(method, reinterpret_cast<IMP>(oldSetTitlebarAppearsTransparent));
-        oldSetTitlebarAppearsTransparent = nil;
+            method =
+                class_getInstanceMethod(windowClass, @selector(setTitlebarAppearsTransparent:));
+            method_setImplementation(method,
+                                     reinterpret_cast<IMP>(oldSetTitlebarAppearsTransparent));
+            oldSetTitlebarAppearsTransparent = nil;
 
 #if 0
-        method = class_getInstanceMethod(windowClass, @selector(canBecomeKeyWindow));
-        Q_ASSERT(method);
-        method_setImplementation(method, reinterpret_cast<IMP>(oldCanBecomeKeyWindow));
-        oldCanBecomeKeyWindow = nil;
+            method = class_getInstanceMethod(windowClass, @selector(canBecomeKeyWindow));
+            method_setImplementation(method, reinterpret_cast<IMP>(oldCanBecomeKeyWindow));
+            oldCanBecomeKeyWindow = nil;
 
-        method = class_getInstanceMethod(windowClass, @selector(canBecomeMainWindow));
-        Q_ASSERT(method);
-        method_setImplementation(method, reinterpret_cast<IMP>(oldCanBecomeMainWindow));
-        oldCanBecomeMainWindow = nil;
+            method = class_getInstanceMethod(windowClass, @selector(canBecomeMainWindow));
+            method_setImplementation(method, reinterpret_cast<IMP>(oldCanBecomeMainWindow));
+            oldCanBecomeMainWindow = nil;
 #endif
 
-        method = class_getInstanceMethod(windowClass, @selector(sendEvent:));
-        Q_ASSERT(method);
-        method_setImplementation(method, reinterpret_cast<IMP>(oldSendEvent));
-        oldSendEvent = nil;
-    }
+            method = class_getInstanceMethod(windowClass, @selector(sendEvent:));
+            method_setImplementation(method, reinterpret_cast<IMP>(oldSendEvent));
+            oldSendEvent = nil;
+        }
 
-    void setSystemTitleBarVisible(const bool visible)
-    {
-        NSView *nsview = [nswindow contentView];
-        if (!nsview) {
-            return;
-        }
-        nsview.wantsLayer = YES;
-        nswindow.styleMask |= NSWindowStyleMaskResizable;
-        if (visible) {
-            nswindow.styleMask &= ~NSWindowStyleMaskFullSizeContentView;
-        } else {
-            nswindow.styleMask |= NSWindowStyleMaskFullSizeContentView;
-        }
-        nswindow.titlebarAppearsTransparent = (visible ? NO : YES);
-        nswindow.titleVisibility = (visible ? NSWindowTitleVisible : NSWindowTitleHidden);
-        nswindow.hasShadow = YES;
-        nswindow.showsToolbarButton = NO;
-        nswindow.movableByWindowBackground = NO;
-        nswindow.movable = NO;
-        // For some unknown reason, we don't need the following hack in Qt versions below or equal to 6.2.4.
+        void setSystemTitleBarVisible(const bool visible) {
+            NSView *nsview = [nswindow contentView];
+            if (!nsview) {
+                return;
+            }
+            nsview.wantsLayer = YES;
+            nswindow.styleMask |= NSWindowStyleMaskResizable;
+            if (visible) {
+                nswindow.styleMask &= ~NSWindowStyleMaskFullSizeContentView;
+            } else {
+                nswindow.styleMask |= NSWindowStyleMaskFullSizeContentView;
+            }
+            nswindow.titlebarAppearsTransparent = (visible ? NO : YES);
+            nswindow.titleVisibility = (visible ? NSWindowTitleVisible : NSWindowTitleHidden);
+            nswindow.hasShadow = YES;
+            nswindow.showsToolbarButton = NO;
+            nswindow.movableByWindowBackground = NO;
+            nswindow.movable = NO; // This line causes the window in the wrong position when
+                                   // become fullscreen.
+            //  For some unknown reason, we don't need the following hack in Qt versions below or
+            //  equal to 6.2.4.
 #if (QT_VERSION > QT_VERSION_CHECK(6, 2, 4))
-        [nswindow standardWindowButton:NSWindowCloseButton].hidden = (visible ? NO : YES);
-        [nswindow standardWindowButton:NSWindowMiniaturizeButton].hidden = (visible ? NO : YES);
-        [nswindow standardWindowButton:NSWindowZoomButton].hidden = (visible ? NO : YES);
+            [nswindow standardWindowButton:NSWindowCloseButton].hidden = (visible ? NO : YES);
+            [nswindow standardWindowButton:NSWindowMiniaturizeButton].hidden = (visible ? NO : YES);
+            [nswindow standardWindowButton:NSWindowZoomButton].hidden = (visible ? NO : YES);
 #endif
-    }
+        }
 
-private:
-    static BOOL canBecomeKeyWindow(id obj, SEL sel)
-    {
-        if (instances.contains(reinterpret_cast<NSWindow *>(obj))) {
+    private:
+        static BOOL canBecomeKeyWindow(id obj, SEL sel) {
+            if (instances.contains(reinterpret_cast<NSWindow *>(obj))) {
+                return YES;
+            }
+
+            if (oldCanBecomeKeyWindow) {
+                return oldCanBecomeKeyWindow(obj, sel);
+            }
+
             return YES;
         }
 
-        if (oldCanBecomeKeyWindow) {
-            return oldCanBecomeKeyWindow(obj, sel);
-        }
+        static BOOL canBecomeMainWindow(id obj, SEL sel) {
+            if (instances.contains(reinterpret_cast<NSWindow *>(obj))) {
+                return YES;
+            }
 
-        return YES;
-    }
+            if (oldCanBecomeMainWindow) {
+                return oldCanBecomeMainWindow(obj, sel);
+            }
 
-    static BOOL canBecomeMainWindow(id obj, SEL sel)
-    {
-        if (instances.contains(reinterpret_cast<NSWindow *>(obj))) {
             return YES;
         }
 
-        if (oldCanBecomeMainWindow) {
-            return oldCanBecomeMainWindow(obj, sel);
+        static void setStyleMask(id obj, SEL sel, NSWindowStyleMask styleMask) {
+            if (instances.contains(reinterpret_cast<NSWindow *>(obj))) {
+                styleMask |= NSWindowStyleMaskFullSizeContentView;
+            }
+
+            if (oldSetStyleMask) {
+                oldSetStyleMask(obj, sel, styleMask);
+            }
         }
 
-        return YES;
-    }
+        static void setTitlebarAppearsTransparent(id obj, SEL sel, BOOL transparent) {
+            if (instances.contains(reinterpret_cast<NSWindow *>(obj))) {
+                transparent = YES;
+            }
 
-    static void setStyleMask(id obj, SEL sel, NSWindowStyleMask styleMask)
-    {
-        if (instances.contains(reinterpret_cast<NSWindow *>(obj))) {
-            styleMask |= NSWindowStyleMaskFullSizeContentView;
+            if (oldSetTitlebarAppearsTransparent) {
+                oldSetTitlebarAppearsTransparent(obj, sel, transparent);
+            }
         }
 
-        if (oldSetStyleMask) {
-            oldSetStyleMask(obj, sel, styleMask);
-        }
-    }
-
-    static void setTitlebarAppearsTransparent(id obj, SEL sel, BOOL transparent)
-    {
-        if (instances.contains(reinterpret_cast<NSWindow *>(obj))) {
-            transparent = YES;
-        }
-
-        if (oldSetTitlebarAppearsTransparent) {
-            oldSetTitlebarAppearsTransparent(obj, sel, transparent);
-        }
-    }
-
-    static void sendEvent(id obj, SEL sel, NSEvent *event)
-    {
-        if (oldSendEvent) {
-            oldSendEvent(obj, sel, event);
-        }
+        static void sendEvent(id obj, SEL sel, NSEvent *event) {
+            if (oldSendEvent) {
+                oldSendEvent(obj, sel, event);
+            }
 
 #if 0
-        const auto nswindow = reinterpret_cast<NSWindow *>(obj);
-        const auto it = instances.find(nswindow);
-        if (it == instances.end()) {
-            return;
-        }
+            const auto nswindow = reinterpret_cast<NSWindow *>(obj);
+            const auto it = instances.find(nswindow);
+            if (it == instances.end()) {
+                return;
+            }
 
-        NSWindowProxy * const proxy = it.value();
-        if (event.type == NSEventTypeLeftMouseDown) {
-            proxy->lastMouseDownEvent = event;
-            QCoreApplication::processEvents();
-            proxy->lastMouseDownEvent = nil;
-        }
+            NSWindowProxy *proxy = it.value();
+            if (event.type == NSEventTypeLeftMouseDown) {
+                proxy->lastMouseDownEvent = event;
+                QCoreApplication::processEvents();
+                proxy->lastMouseDownEvent = nil;
+            }
 #endif
-    }
-
-private:
-    NSWindow *nswindow = nil;
-    //NSEvent *lastMouseDownEvent = nil;
-
-    static inline QHash<NSWindow *, NSWindowProxy *> instances = {};
-
-    static inline Class windowClass = nil;
-
-    using setStyleMaskPtr = void(*)(id, SEL, NSWindowStyleMask);
-    static inline setStyleMaskPtr oldSetStyleMask = nil;
-
-    using setTitlebarAppearsTransparentPtr = void(*)(id, SEL, BOOL);
-    static inline setTitlebarAppearsTransparentPtr oldSetTitlebarAppearsTransparent = nil;
-
-    using canBecomeKeyWindowPtr = BOOL(*)(id, SEL);
-    static inline canBecomeKeyWindowPtr oldCanBecomeKeyWindow = nil;
-
-    using canBecomeMainWindowPtr = BOOL(*)(id, SEL);
-    static inline canBecomeMainWindowPtr oldCanBecomeMainWindow = nil;
-
-    using sendEventPtr = void(*)(id, SEL, NSEvent *);
-    static inline sendEventPtr oldSendEvent = nil;
-};
-
-using ProxyList = QHash<WId, NSWindowProxy *>;
-Q_GLOBAL_STATIC(ProxyList, g_proxyList);
-
-    static inline NSWindow *mac_getNSWindow(const WId windowId)
-    {
-        const auto nsview = reinterpret_cast<NSView *>(windowId);
-        if (!nsview) {
-            return nil;
         }
+
+    private:
+        Q_DISABLE_COPY(NSWindowProxy)
+
+        NSWindow *nswindow = nil;
+        // NSEvent *lastMouseDownEvent = nil;
+
+        static inline QHash<NSWindow *, NSWindowProxy *> instances = {};
+
+        static inline Class windowClass = nil;
+
+        using setStyleMaskPtr = void (*)(id, SEL, NSWindowStyleMask);
+        static inline setStyleMaskPtr oldSetStyleMask = nil;
+
+        using setTitlebarAppearsTransparentPtr = void (*)(id, SEL, BOOL);
+        static inline setTitlebarAppearsTransparentPtr oldSetTitlebarAppearsTransparent = nil;
+
+        using canBecomeKeyWindowPtr = BOOL (*)(id, SEL);
+        static inline canBecomeKeyWindowPtr oldCanBecomeKeyWindow = nil;
+
+        using canBecomeMainWindowPtr = BOOL (*)(id, SEL);
+        static inline canBecomeMainWindowPtr oldCanBecomeMainWindow = nil;
+
+        using sendEventPtr = void (*)(id, SEL, NSEvent *);
+        static inline sendEventPtr oldSendEvent = nil;
+    };
+
+    using ProxyList = QHash<WId, NSWindowProxy *>;
+    Q_GLOBAL_STATIC(ProxyList, g_proxyList);
+
+    static inline NSWindow *mac_getNSWindow(const WId windowId) {
+        const auto nsview = reinterpret_cast<NSView *>(windowId);
         return [nsview window];
     }
 
-static inline void cleanupProxy()
-{
-    if (g_proxyList()->isEmpty()) {
-        return;
-    }
-    const auto &data = *g_proxyList();
-    qDeleteAll(data);
-    g_proxyList()->clear();
-}
-
-static inline NSWindowProxy *ensureWindowProxy(const WId windowId)
-{
-    auto it = g_proxyList()->find(windowId);
-    if (it == g_proxyList()->end()) {
-        NSWindow *nswindow = mac_getNSWindow(windowId);
-        if (!nswindow) {
-            return nil;
+    static inline NSWindowProxy *ensureWindowProxy(const WId windowId) {
+        auto it = g_proxyList()->find(windowId);
+        if (it == g_proxyList()->end()) {
+            NSWindow *nswindow = mac_getNSWindow(windowId);
+            const auto proxy = new NSWindowProxy(nswindow);
+            it = g_proxyList()->insert(windowId, proxy);
         }
-        const auto proxy = new NSWindowProxy(nswindow);
-        it = g_proxyList()->insert(windowId, proxy);
+        return it.value();
     }
-    static bool cleanerInstalled = false;
-    if (!cleanerInstalled) {
-        cleanerInstalled = true;
-        qAddPostRoutine(cleanupProxy);
-    }
-    return it.value();
-}
 
-    CocoaWindowContext::CocoaWindowContext() {
+    static inline void releaseWindowProxy(const WId windowId) {
+        if (const auto proxy = g_proxyList()->take(windowId)) {
+            proxy->setSystemTitleBarVisible(true);
+            delete proxy;
+        }
+    }
+
+    class CocoaWindowEventFilter : public QObject {
+    public:
+        explicit CocoaWindowEventFilter(AbstractWindowContext *context, QObject *parent = nullptr);
+        ~CocoaWindowEventFilter() override;
+
+        enum WindowStatus {
+            Idle,
+            WaitingRelease,
+            PreparingMove,
+            Moving,
+        };
+
+    protected:
+        bool eventFilter(QObject *object, QEvent *event) override;
+
+    private:
+        AbstractWindowContext *m_context;
+        bool m_cursorShapeChanged;
+        WindowStatus m_windowStatus;
+    };
+
+    CocoaWindowEventFilter::CocoaWindowEventFilter(AbstractWindowContext *context, QObject *parent)
+        : QObject(parent), m_context(context), m_cursorShapeChanged(false), m_windowStatus(Idle) {
+        m_context->window()->installEventFilter(this);
+    }
+
+    CocoaWindowEventFilter::~CocoaWindowEventFilter() = default;
+
+    bool CocoaWindowEventFilter::eventFilter(QObject *obj, QEvent *event) {
+        Q_UNUSED(obj)
+        auto type = event->type();
+        if (type < QEvent::MouseButtonPress || type > QEvent::MouseMove) {
+            return false;
+        }
+        auto host = m_context->host();
+        auto window = m_context->window();
+        auto delegate = m_context->delegate();
+        auto me = static_cast<const QMouseEvent *>(event);
+
+        QPoint scenePos = getMouseEventScenePos(me);
+        QPoint globalPos = getMouseEventGlobalPos(me);
+
+        bool inTitleBar = m_context->isInTitleBarDraggableArea(scenePos);
+        switch (type) {
+            case QEvent::MouseButtonPress: {
+                switch (me->button()) {
+                    case Qt::LeftButton: {
+                        if (inTitleBar) {
+                            // If we call startSystemMove() now but release the mouse without actual
+                            // movement, there will be no MouseReleaseEvent, so we defer it when the
+                            // mouse is actually moving for the first time
+                            m_windowStatus = PreparingMove;
+                            event->accept();
+                            return true;
+                        }
+                        break;
+                    }
+                    case Qt::RightButton: {
+                        m_context->showSystemMenu(globalPos);
+                        break;
+                    }
+                    default:
+                        break;
+                }
+                m_windowStatus = WaitingRelease;
+                break;
+            }
+
+            case QEvent::MouseButtonRelease: {
+                switch (m_windowStatus) {
+                    case PreparingMove:
+                    case Moving: {
+                        m_windowStatus = Idle;
+                        event->accept();
+                        return true;
+                    }
+                    case WaitingRelease: {
+                        m_windowStatus = Idle;
+                        break;
+                    }
+                    default: {
+                        if (inTitleBar) {
+                            event->accept();
+                            return true;
+                        }
+                        break;
+                    }
+                }
+                break;
+            }
+
+            case QEvent::MouseMove: {
+                switch (m_windowStatus) {
+                    case Moving: {
+                        return true;
+                    }
+                    case PreparingMove: {
+                        m_windowStatus = Moving;
+                        startSystemMove(window);
+                        event->accept();
+                        return true;
+                    }
+                    default:
+                        break;
+                }
+                break;
+            }
+
+            case QEvent::MouseButtonDblClick: {
+                if (me->button() == Qt::LeftButton && inTitleBar &&
+                    !delegate->isHostSizeFixed(host)) {
+                    Qt::WindowStates windowState = delegate->getWindowState(host);
+                    if (!(windowState & Qt::WindowFullScreen)) {
+                        if (windowState & Qt::WindowMaximized) {
+                            delegate->setWindowState(host, windowState & ~Qt::WindowMaximized);
+                        } else {
+                            delegate->setWindowState(host, windowState | Qt::WindowMaximized);
+                        }
+                        event->accept();
+                        return true;
+                    }
+                }
+                break;
+            }
+
+            default:
+                break;
+        }
+        return false;
+    }
+
+    CocoaWindowContext::CocoaWindowContext() : AbstractWindowContext() {
     }
 
     CocoaWindowContext::~CocoaWindowContext() {
+        releaseWindowProxy(windowId);
     }
 
     QString CocoaWindowContext::key() const {
@@ -273,17 +370,47 @@
     }
 
     void CocoaWindowContext::virtual_hook(int id, void *data) {
+        switch (id) {
+            case SystemButtonAreaChangedHook: {
+                // TODO: mac system button rect updated
+                return;
+            }
+
+            default:
+                break;
+        }
+        AbstractWindowContext::virtual_hook(id, data);
     }
 
-    bool CocoaWindowContext::setupHost() {
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    m_windowHandle->setProperty("_q_mac_wantsLayer", 1);
-#endif
-        WId winId = m_windowHandle->winId();
-        ensureWindowProxy(winId)->setSystemTitleBarVisible(false);
-        // Cache window ID
-        windowId = winId;
-        return true;
+    void CocoaWindowContext::winIdChanged() {
+        // If the original window id is valid, remove all resources related
+        if (windowId) {
+            releaseWindowProxy(windowId);
+            windowId = 0;
+            cocoaWindowEventFilter.reset();
+        }
+
+        if (!m_windowHandle) {
+            return;
+        }
+
+        // Allocate new resources
+        windowId = m_windowHandle->winId();
+        ensureWindowProxy(windowId)->setSystemTitleBarVisible(false);
+        cocoaWindowEventFilter = std::make_unique<CocoaWindowEventFilter>(this, this);
+    }
+
+    bool CocoaWindowContext::windowAttributeChanged(const QString &key, const QVariant &attribute,
+                                                    const QVariant &oldAttribute) {
+        if (key == QStringLiteral("no-system-buttons")) {
+            if (attribute.toBool()) {
+                // TODO: set off
+            } else {
+                // TODO: set on
+            }
+            return true;
+        }
+        return false;
     }
 
 }

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