Add new winIdChange event filter

Sine Striker

2024-02-22 77bce901860548cd84c1680672ec75fbd6184cf8

 src/core/contexts/abstractwindowcontext.cpp

@@ -1,34 +1,49 @@
// 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 "abstractwindowcontext_p.h"

#include <QtGui/QPen>
#include <QtGui/QPainter>
#include <QtGui/QScreen>
#include <memory>

#include "qwkglobal_p.h"

namespace QWK {

    class WinIdChangeEventFilter : public QObject {
    public:
        explicit WinIdChangeEventFilter(QObject *widget, AbstractWindowContext *ctx,
                                        QObject *parent = nullptr)
            : QObject(parent), ctx(ctx) {
            widget->installEventFilter(this);
        }
    namespace {

    protected:
        bool eventFilter(QObject *obj, QEvent *event) override {
            Q_UNUSED(obj)
            if (event->type() == QEvent::WinIdChange) {
                ctx->notifyWinIdChange();
        class WindowEventFilter : public QObject {
        public:
            explicit WindowEventFilter(QWindow *window, AbstractWindowContext *ctx,
                                       QObject *parent = nullptr)
                : QObject(parent), ctx(ctx), window(window) {
                if (window)
                    window->installEventFilter(this);
            }
            return false;
        }

    protected:
        AbstractWindowContext *ctx;
    };
            inline void setWindow(QWindow *win) {
                if (auto oldWin = window.data(); oldWin) {
                    oldWin->removeEventFilter(this);
                }
                window = win;
                if (win) {
                    win->installEventFilter(this);
                }
            }

        protected:
            bool eventFilter(QObject *obj, QEvent *event) override {
                return ctx->sharedDispatch(obj, event);
            }

        protected:
            AbstractWindowContext *ctx;
            QPointer<QWindow> window;
        };

    }

    AbstractWindowContext::AbstractWindowContext() = default;

@@ -40,12 +55,9 @@
        }
        m_host = host;
        m_delegate.reset(delegate);
        m_winIdChangeEventFilter = std::make_unique<WinIdChangeEventFilter>(host, this);

        m_windowHandle = m_delegate->hostWindow(m_host);
        if (m_windowHandle) {
            winIdChanged();
        }
        m_winIdChangeEventFilter.reset(delegate->createWinIdEventFilter(host, this));
        m_windowEventFilter = std::make_unique<WindowEventFilter>(m_windowHandle, this);
        notifyWinIdChange();
    }

    bool AbstractWindowContext::setHitTestVisible(const QObject *obj, bool visible) {
@@ -95,8 +107,8 @@
    }

#ifdef Q_OS_MAC
    void AbstractWindowContext::setSystemButtonArea(const QRect &rect) {
        m_systemButtonArea = rect;
    void AbstractWindowContext::setSystemButtonAreaCallback(const ScreenRectCallback &callback) {
        m_systemButtonAreaCallback = callback;
        virtual_hook(SystemButtonAreaChangedHook, nullptr);
    }
#endif
@@ -176,16 +188,21 @@
                if (!m_windowHandle)
                    return;

                QRect windowGeometry = m_delegate->getGeometry(m_host);
                QRect screenGeometry = m_windowHandle->screen()->geometry();
                int x = (screenGeometry.width() - m_windowHandle->width()) / 2;
                int y = (screenGeometry.height() - m_windowHandle->height()) / 2;
                int x = (screenGeometry.width() - windowGeometry.width()) / 2;
                int y = (screenGeometry.height() - windowGeometry.height()) / 2;
                QPoint pos(x, y);
                pos += screenGeometry.topLeft();
                m_windowHandle->setPosition(pos);
                m_delegate->setGeometry(m_host, QRect(pos, windowGeometry.size()));
                return;
            }

            case RaiseWindowHook: {
                if (!m_windowHandle)
                    return;

                m_delegate->setWindowVisible(m_host, true);
                Qt::WindowStates state = m_delegate->getWindowState(m_host);
                if (state & Qt::WindowMinimized) {
                    m_delegate->setWindowState(m_host, state & ~Qt::WindowMinimized);
@@ -214,11 +231,72 @@
    }

    void AbstractWindowContext::notifyWinIdChange() {
        auto oldWindow = m_windowHandle;
        auto oldWinId = m_windowId;
        m_windowId = m_winIdChangeEventFilter->winId();

        // In Qt6, after QWidget::close() is called, the related QWindow's all surfaces and the
        // platform window will be removed, and the WinId will be set to 0. After that, when the
        // QWidget is shown again, the whole things will be recreated again.
        // As a result, we must update our WindowContext each time the WinId changes.
        m_windowHandle = m_delegate->hostWindow(m_host);
        if (oldWindow == m_windowHandle)
            return;
        winIdChanged();

        auto windowEventFilter = static_cast<WindowEventFilter *>(m_windowEventFilter.get());
        windowEventFilter->setWindow(nullptr);

        if (oldWinId != m_windowId) {
            winIdChanged(m_windowId, oldWinId);
        }

        if (m_windowHandle) {
            windowEventFilter->setWindow(m_windowHandle);

            // Refresh window attributes
            auto attributes = m_windowAttributes;
            m_windowAttributes.clear();
            for (auto it = attributes.begin(); it != attributes.end(); ++it) {
                if (!windowAttributeChanged(it.key(), it.value(), {})) {
                    continue;
                }
                m_windowAttributes.insert(it.key(), it.value());
            }
        }
    }

    QVariant AbstractWindowContext::windowAttribute(const QString &key) const {
        return m_windowAttributes.value(key);
    }

    bool AbstractWindowContext::setWindowAttribute(const QString &key, const QVariant &attribute) {
        auto it = m_windowAttributes.find(key);
        if (it == m_windowAttributes.end()) {
            if (!attribute.isValid()) {
                return true;
            }
            if (!m_windowHandle || !windowAttributeChanged(key, attribute, {})) {
                return false;
            }
            m_windowAttributes.insert(key, attribute);
            return true;
        }

        if (it.value() == attribute)
            return true;
        if (!m_windowHandle || !windowAttributeChanged(key, attribute, it.value())) {
            return false;
        }

        if (attribute.isValid()) {
            it.value() = attribute;
        } else {
            m_windowAttributes.erase(it);
        }
        return true;
    }

    bool AbstractWindowContext::windowAttributeChanged(const QString &key,
                                                       const QVariant &attribute,
                                                       const QVariant &oldAttribute) {
        return false;
    }

}