QAbstractListModel does not update QML ListView

[fonzi337]

Hi wysota,

Thank you, that helps clarify things. You recommended I "connect to the model's event." What event would that be? Would you recommend instead that I add Q_PROPERTYs to the _arrivingVisitorModel class that are always connected to the property of the current model index? In other words, something like

// visitormodel.h
class VisitorModel : public QAbstractListModel
{
    Q_OBJECT
    Q_PROPERTY(QString m_vin READ vin WRITE setVin NOTIFY vinChanged)
    // ...
    void setVin(const QString& vin);
    QString vin() const;
    // ...
signals:
    void vinChanged(QString vin);
    // ...
private:
    QList<VehicleItem*> m_list;
};
 
// visitormodel.cpp
QString VisitorModel::vin() const
{
    return m_list[currentIndex].vin();
}
 
void VisitorModel::setVin(const QString& vin)
{
    if(m_list[currentIndex].vin() != vin)
    {
        m_list[currentIndex].setVin(vin);
        emit vinChanged();
        emit dataChanged();
    }
}

// visitormodel.h
class VisitorModel : public QAbstractListModel
{
    Q_OBJECT
    Q_PROPERTY(QString m_vin READ vin WRITE setVin NOTIFY vinChanged)
    // ...
    void setVin(const QString& vin);
    QString vin() const;
    // ...
signals:
    void vinChanged(QString vin);
    // ...
private:
    QList<VehicleItem*> m_list;
};

// visitormodel.cpp
QString VisitorModel::vin() const
{
    return m_list[currentIndex].vin();
}

void VisitorModel::setVin(const QString& vin)
{
    if(m_list[currentIndex].vin() != vin)
    {
        m_list[currentIndex].setVin(vin);
        emit vinChanged();
        emit dataChanged();
    }
}

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In general, what is the recommended approach for communicating individual property/data member changes of each item in a QAbstractListModel-derived model to QML?

[wysota]

The model has a bunch of signals (such as dataChanged, rowsInserted, etc.) you can connect to. No need to create new signals. Also bear in mind the model has no concept of a "current index". A model is just an interface to data, it has no notion of a "current" index. That's an attribute of the view.

[fonzi337]

Thanks wysota. I'll try connecting to the dataChanged signal.