Add QtContext WinIdChange workaround

Sine Striker

2023-12-18 d3d7430ec9afb94abaf78fa2c9edd9d9f946881c

Add QtContext WinIdChange workaround

 README.md

@@ -11,7 +11,7 @@
+ Fix `isFixedSize` code
+ Support customized system button area on Mac
+ Make Linux system move/resize more robust
+ Fix unhandled WinIdChange when adding a QWebEngineView as sub-widget
+ Fix unhandled WinIdChange when adding a QWebEngineView as sub-widget (Win32 and Qt fixed)

## Supported Platforms


 examples/mainwindow/main.cpp

@@ -7,7 +7,6 @@
int main(int argc, char *argv[]) {
    qputenv("QT_WIN_DEBUG_CONSOLE", "1");
    qputenv("QSG_INFO", "1");
    qputenv("QT_WIDGETS_HIGHDPI_DOWNSCALE", "1");
#if 0
    qputenv("QT_WIDGETS_RHI", "1");
    qputenv("QSG_RHI_BACKEND", "d3d12");

 src/core/contexts/abstractwindowcontext.cpp

@@ -19,8 +19,7 @@
        m_delegate.reset(delegate);
        m_windowHandle = m_delegate->hostWindow(m_host);
        if (m_windowHandle) {
            m_windowHandleGuard = m_windowHandle;
            winIdChanged(nullptr, false);
            winIdChanged(nullptr);
        }
    }

@@ -176,7 +175,9 @@
    void AbstractWindowContext::notifyWinIdChange() {
        auto oldWindow = m_windowHandle;
        m_windowHandle = m_delegate->window(m_host);
        winIdChanged(oldWindow, oldWindow && m_windowHandleGuard.isNull());
        if (oldWindow == m_windowHandle)
            return;
        winIdChanged(oldWindow);
    }

}

 src/core/contexts/abstractwindowcontext_p.h

@@ -60,13 +60,12 @@
        void notifyWinIdChange();

    protected:
        virtual void winIdChanged(QWindow *oldWindow, bool destroyed) = 0;
        virtual void winIdChanged(QWindow *oldWindow) = 0;

    protected:
        QObject *m_host{};
        std::unique_ptr<WindowItemDelegate> m_delegate;
        QWindow *m_windowHandle{};
        QPointer<QWindow> m_windowHandleGuard;

        QSet<const QObject *> m_hitTestVisibleItems;
#ifdef Q_OS_MAC

 src/core/contexts/cocoawindowcontext.mm

@@ -390,10 +390,10 @@
        AbstractWindowContext::virtual_hook(id, data);
    }

    bool CocoaWindowContext::winIdChanged(QWindow *oldWindow) {
    void CocoaWindowContext::winIdChanged(QWindow *oldWindow, bool destroyed) {
        windowId = m_windowHandle->winId();
        ensureWindowProxy(windowId)->setSystemTitleBarVisible(false);
        std::ignore = new CocoaWindowEventFilter(this, this);
        cocoaWindowEventFilter = std::make_unique<CocoaWindowEventFilter>(this, this);
        return true;
    }


 src/core/contexts/cocoawindowcontext_p.h

@@ -19,6 +19,8 @@

    protected:
        WId windowId = 0;

        std::unique_ptr<QObject> cocoaWindowEventFilter;
    };

}

 src/core/contexts/qtwindowcontext.cpp

@@ -253,10 +253,11 @@
        AbstractWindowContext::virtual_hook(id, data);
    }

    bool QtWindowContext::winIdChanged() {
        m_delegate->setWindowFlags(m_host, Qt::FramelessWindowHint);
        std::ignore = new QtWindowEventFilter(this, this);
        return true;
    void QtWindowContext::winIdChanged(QWindow *oldWindow) {
        Q_UNUSED(oldWindow)
        m_delegate->setWindowFlags(m_host,
                                   m_delegate->getWindowFlags(m_host) | Qt::FramelessWindowHint);
        qtWindowEventFilter = std::make_unique<QtWindowEventFilter>(this);
    }

}

 src/core/contexts/qtwindowcontext_p.h

@@ -15,7 +15,10 @@
        void virtual_hook(int id, void *data) override;

    protected:
        bool winIdChanged() override;
        void winIdChanged(QWindow *oldWindow) override;

    protected:
        std::unique_ptr<QObject> qtWindowEventFilter;
    };

}

 src/core/contexts/win32windowcontext.cpp

@@ -780,7 +780,7 @@
        g_wndProcHash->insert(hWnd, ctx);
    }

    static inline void removeManagedWindow(HWND hWnd, bool restore) {
    static inline void removeManagedWindow(HWND hWnd) {
        // Remove window handle mapping
        if (!g_wndProcHash->remove(hWnd))
            return;
@@ -789,11 +789,6 @@
        if (g_wndProcHash->empty()) {
            WindowsNativeEventFilter::uninstall();
        }

        // Restore window proc
        if (restore) {
            ::SetWindowLongPtrW(hWnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(g_qtWindowProc));
        }
    }

    Win32WindowContext::Win32WindowContext() : AbstractWindowContext() {
@@ -801,7 +796,7 @@

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

@@ -897,9 +892,9 @@
        return getWindowFrameBorderThickness(reinterpret_cast<HWND>(windowId));
    }

    void Win32WindowContext::winIdChanged(QWindow *oldWindow, bool destroyed) {
    void Win32WindowContext::winIdChanged(QWindow *oldWindow) {
        if (oldWindow) {
            removeManagedWindow(reinterpret_cast<HWND>(windowId), !destroyed);
            removeManagedWindow(reinterpret_cast<HWND>(windowId));
        }

        if (!m_windowHandle) {

 src/core/contexts/win32windowcontext_p.h

@@ -30,7 +30,7 @@
        int borderThickness() const;

    protected:
        void winIdChanged(QWindow *oldWindow, bool destroyed) override;
        void winIdChanged(QWindow *oldWindow) override;

    public:
        bool windowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam, LRESULT *result);