Extending QML - Object and List Property Types Example

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#include "birthdayparty.h"

BirthdayParty::BirthdayParty(QObject *parent)
: QObject(parent), m_host(nullptr)
{
}

// ![0]
Person *BirthdayParty::host() const
{
    return m_host;
}

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

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

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();
}

// ![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();
}

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();
}