Exposing QQmlListProperty to QML

[James A]

I am trying to expose C++ class containing QQmlListProperty to QML and displaying the data using Reapter as shown below. But I am unable to view the Data in the qml page

 Row{
        Repeater{
            model: guests
            delegate: Text {

                text: name
            }
        }
    }

main.cpp

 QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;

    QQmlContext* context = engine.rootContext();

 qRegisterMetaType<QQmlListProperty<Person>>("QQmlListProperty<Person>");

    BirthdayParty party;

    party.appendGuest(new Person("abc",123));
    party.appendGuest(new Person("xyz",123));

    context->setContextObject(&party);

    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();

I am using the below class for exposing to qml
birthdaypart.h

class BirthdayParty : public QObject
{
    Q_OBJECT

    Q_PROPERTY(Person *host READ host WRITE setHost)
    Q_PROPERTY(QQmlListProperty<Person> guests READ guests NOTIFY guestsChanged)

    QML_ELEMENT
public:
    BirthdayParty(QObject *parent = nullptr);

    Person *host() const;
    void setHost(Person *);

    QQmlListProperty<Person> guests();
    void appendGuest(Person*);
    int guestCount() const;
    Person *guest(int) const;
    void clearGuests();
    void replaceGuest(int, Person*);
    void removeLastGuest();

signals:
    void guestsChanged(QQmlListProperty<Person> guests);

private:
    static void appendGuest(QQmlListProperty<Person>*, Person*);
    static int guestCount(QQmlListProperty<Person>*);
    static Person* guest(QQmlListProperty<Person>*, int);
    static void clearGuests(QQmlListProperty<Person>*);
    static void replaceGuest(QQmlListProperty<Person>*, int, Person*);
    static void removeLastGuest(QQmlListProperty<Person>*);

    Person *m_host;
    QVector<Person *> m_guests;
};

birthdayparty.cpp

Person *BirthdayParty::host() const
{
    return m_host;
}

void BirthdayParty::setHost(Person *c)
{
    m_host = c;
}

QQmlListProperty<Person> BirthdayParty::guests()
{
    return {this, this,
             &BirthdayParty::appendGuest,
             &BirthdayParty::guestCount,
             &BirthdayParty::guest,
             &BirthdayParty::clearGuests,
             &BirthdayParty::replaceGuest,
             &BirthdayParty::removeLastGuest};
}

void BirthdayParty::appendGuest(Person* p) {
    m_guests.append(p);
}


int BirthdayParty::guestCount() const
{
    return m_guests.count();
}

Person *BirthdayParty::guest(int index) const
{
    return m_guests.at(index);
}

void BirthdayParty::clearGuests() {
    m_guests.clear();
}

void BirthdayParty::replaceGuest(int index, Person *p)
{
    m_guests[index] = p;
}

void BirthdayParty::removeLastGuest()
{
    m_guests.removeLast();
}

// ![0]

void BirthdayParty::appendGuest(QQmlListProperty<Person>* list, Person* p) {
    reinterpret_cast< BirthdayParty* >(list->data)->appendGuest(p);
}

void BirthdayParty::clearGuests(QQmlListProperty<Person>* list) {
    reinterpret_cast< BirthdayParty* >(list->data)->clearGuests();
}

void BirthdayParty::replaceGuest(QQmlListProperty<Person> *list, int i, Person *p)
{
    reinterpret_cast< BirthdayParty* >(list->data)->replaceGuest(i, p);
}

void BirthdayParty::removeLastGuest(QQmlListProperty<Person> *list)
{
    reinterpret_cast< BirthdayParty* >(list->data)->removeLastGuest();
}

Person* BirthdayParty::guest(QQmlListProperty<Person>* list, int i) {
    return reinterpret_cast< BirthdayParty* >(list->data)->guest(i);
}

int BirthdayParty::guestCount(QQmlListProperty<Person>* list) {
    return reinterpret_cast< BirthdayParty* >(list->data)->guestCount();
}

Person class contains two fileds

  Q_PROPERTY(QString name READ name WRITE setName NOTIFY nameChanged)
  Q_PROPERTY(int shoseSize READ shoseSize WRITE setShoseSize NOTIFY shoseSizeChanged)

[James A]

I am able to fix the issue by adding the below lines in the main.cpp file

  //    qRegisterMetaType<QQmlListProperty<Person>>("QQmlListProperty<Person>");
    qmlRegisterType<Person>("Person", 1, 0, "Person");
    qmlRegisterType<BirthdayParty>("BirthdayParty", 1, 0, "BirthdayParty");