Add Component to QQmlListProperty from C++?

Prochy

Hi,

i'm trying to add Component to QQmlListProperty from C++, but i am unable to do so. I've tried almost everything. I'm trying to solve on a Example: Writing QML Extensions with C++ (Chapter 5).

I tried it in the following way:

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    QQmlApplicationEngine* engine = new QQmlApplicationEngine();
    QQmlComponent* myComponent = new QQmlComponent(engine, engine);

    qmlRegisterType<PieChart>("Charts", 1, 0, "PieChart");
    qmlRegisterType<PieSlice>("Charts", 1, 0, "PieSlice");
    myComponent->loadUrl(QUrl(QStringLiteral("qrc:///app.qml")));
    QObject* myComponentObj=myComponent->create();
    PieChart *chart = myComponentObj->findChild<PieChart*>("PieChart");
    PieSlice *slice = new PieSlice();
    slice->setColor(QColor(0,0,0,255));
    slice->setFromAngle(110);
    slice->setAngleSpan(50);
    slice->setVisible(true);        
    chart->addSlice(slice);
    return app.exec();
}

QQmlListProperty<PieSlice> PieChart::slices()
{
    return QQmlListProperty<PieSlice>(this, 0, &PieChart::append_slice, 0, 0, 0);
}

void PieChart::append_slice(QQmlListProperty<PieSlice> *list, PieSlice *slice)
{    
    PieChart *chart = qobject_cast<PieChart *>(list->object);
    if (chart) {
        slice->setParentItem(chart);
        chart->m_slices.append(slice);
    }

}
//![0]

void PieChart::addSlice(PieSlice *slice){    
    QQmlListProperty<PieSlice> pieSlice=slices();
    PieChart::append_slice(&pieSlice,slice);
}

Second try:
Directly set QList<PieSlice*> chart->m_slices.append(slice);, but this also does not working. :( Method paint(QPainter *painter) in PieSlice.cpp does not call.
Is it possible to solve this problem?
Thank you for help

dheerendra

once you create list you will not be able to modify the list. Note that objects cannot be individually added to or removed from the list once created; to modify the contents of a list, it must be reassigned to a new list.

Prochy

@dheerendra
Okay, thanks for reply. At last i used static items.