derivedgadget.h - mozsearch

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

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

#ifndef DERIVEDGADGET_H

#define DERIVEDGADGET_H

#include <QtQml/qqmlregistration.h>

#include <QtCore/qobject.h>

#include <QtCore/qstring.h>

// A Q_GADGET/QML_VALUE_TYPE that derives from another one and adds properties

// and invokable methods of its own. AOT-compiled QML must not confuse the

// absolute property/method index (as returned by QMetaObject::indexOfProperty()

// or used to build QMetaObject::method()) with the index relative to the

// declaring class that qt_static_metacall() expects. See QTBUG-150640.

class BaseGadget

    Q_GADGET

    QML_VALUE_TYPE(baseGadget)

    Q_PROPERTY(int a READ a CONSTANT FINAL)

public:

    int a() const { return 1; }

    Q_INVOKABLE int baseMethod() const { return 42; }

};

class DerivedGadget : public BaseGadget

    Q_GADGET

    QML_VALUE_TYPE(derivedGadget)

    Q_PROPERTY(int b READ b CONSTANT FINAL)

    Q_PROPERTY(QString c READ c CONSTANT FINAL)

public:

    int b() const { return 2; }

    QString c() const { return QStringLiteral("three"); }

    Q_INVOKABLE int derivedMethod() const { return 99; }

};

class DerivedGadgetProvider : public QObject

    Q_OBJECT

    QML_ELEMENT

    Q_PROPERTY(DerivedGadget value READ value CONSTANT FINAL)

public:

    DerivedGadget value() const { return DerivedGadget(); }

};

#endif // DERIVEDGADGET_H