qobjectregistrysingleton_p.h

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// Copyright (C) 2026 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API. It exists purely as an

// implementation detail. This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#ifndef QOBJECTREGISTRYSINGLETON_P_H

#define QOBJECTREGISTRYSINGLETON_P_H

#include <QtQmlDesignSupport/qtqmldesignsupportexports.h>

#include <QtCore/qhash.h>

#include <QtCore/qobject.h>

#include <QtCore/qset.h>

#include <QtCore/qstring.h>

#include <QtQml/qqml.h>

#include <QtQml/private/qqmlguard_p.h>

#include <memory>

QT_BEGIN_NAMESPACE

class QAbstractObjectRegistryRefPrivate;

class QQmlEngine;

class Q_QMLDESIGNSUPPORT_EXPORT QObjectRegistrySingleton : public QObject

    Q_OBJECT

    QML_SINGLETON

    QML_NAMED_ELEMENT(InternalObjectRegistry)

public:

    explicit QObjectRegistrySingleton(QObject *parent = nullptr);

    ~QObjectRegistrySingleton();

    void registerRef(QAbstractObjectRegistryRefPrivate *ref);

    void deregisterRef(QAbstractObjectRegistryRefPrivate *ref);

    void add(const QString &key, QObject *obj);

    void remove(const QString &key, QObject *obj);

    QSet<QObject*> objects(const QString &key) const;

    static QObjectRegistrySingleton *registryForObject(QObject *obj);

    static QObjectRegistrySingleton *registryForEngine(QQmlEngine *engine);

private:

    enum class Notification { ObjectAdded, ObjectRemoved };

    void notifyRefs(const QString &key, QObject *obj, Notification notification);

    class ObjectGuard : public QQmlGuard<QObject>

    public:

        ObjectGuard(QObjectRegistrySingleton *owner, const QString &key, QObject *obj)

            : QQmlGuard<QObject>(&ObjectGuard::objectDestroyedImpl, obj)

            , m_owner(owner)

            , m_key(key)

            , m_object(obj)

    private:

        static void objectDestroyedImpl(QQmlGuardImpl *guard)

            ObjectGuard *self = static_cast<ObjectGuard *>(guard);

            QObjectRegistrySingleton *owner = self->m_owner;

            const QString key = self->m_key;

            QObject *obj = self->m_object;

            owner->remove(key, obj);

        QObjectRegistrySingleton *m_owner = nullptr;

        QString m_key;

        QObject *m_object = nullptr;

};

    QHash<QString, QHash<QObject *, ObjectGuard *>> m_objects;

    QHash<QString, QSet<QAbstractObjectRegistryRefPrivate *>> m_refs;

};

QT_END_NAMESPACE

#endif // QOBJECTREGISTRYSINGLETON_P_H