Updating ListView when StringList in another class has changed

? Offline

Hello everyone :)

I'm starting right now in Qt/QML developing and I have a simple question. I have the QML page "listStandings" with the following ListView:
@ListView {
id: liveStandingsListPositions
anchors.fill: parent
interactive: false
model: livePositions
delegate:
Item {
id: liveStandingsListPositionsItem
height: 30
width: 30
anchors.left: parent.left
anchors.leftMargin: 10
Text {
color: "white"
text: modelData

                        }
                    }
            }@

The model "livePositions" is from the class live.h and updated through the replyFinished slot:
@class Live : public QObject
{
Q_OBJECT
private slots:
void replyFinished(QNetworkReply* pReply) {
...
positions = tempPos;
driver = tempDriver;
gaps = tempGap;
}
public:
explicit Live(QObject *parent = 0) : QObject(parent) {}

QNetworkAccessManager* m_manager;
QTimer *timer; // = new QTimer(this);
QStringList positions;
QStringList driver;
QStringList gaps;

...
}@

And enabled to QML in the main.cpp:
@{
QScopedPointer<QApplication> app(createApplication(argc, argv));

//Definiere neues Objekt
TimeChanges timeChangesObj;
Live liveObj;
QmlApplicationViewer viewer;

liveObj.init();
liveObj.fetch();

timeChangesObj.dst = false;

//Objekt den QML-Dateien bekannt machen
viewer.rootContext()->setContextProperty("timeChanges", &timeChangesObj);
viewer.rootContext()->setContextProperty("live", &liveObj);
viewer.rootContext()->setContextProperty("livePositions", QVariant::fromValue(liveObj.positions));
viewer.rootContext()->setContextProperty("liveDriver", QVariant::fromValue(liveObj.driver));
viewer.rootContext()->setContextProperty("liveGaps", QVariant::fromValue(liveObj.gaps));

viewer.setMainQmlFile&#40;QLatin1String("qml/F1uptodate/main.qml"&#41;&#41;;
viewer.showExpanded(&#41;;

return app->exec&#40;&#41;;

}@

I found out that I have to call setContextProperty() every time, when the string list gets updated.
But how do I call this method from live.h?

Best Regards,
Sebastian

EDIT: Solved by using Q_PROPERTY:
Q_PROPERTY(QStringList _positions READ _positions NOTIFY liveListChanged)