QML view wont update when adding a new item to a QAbstractListModel based model

Question

I've figured out how to bind a model derived from QAbstractListModel to a QML view. But the next thing I tired does not work. If a new Item is added to the model the QML view will not update. Why is that? DataObject.h ``` class DataObject { public: DataObject(const QString &firstName, const QString &lastName): first(firstName), last(lastName) {} QString first; QString last; }; ``` SimpleListModel.h ``` class SimpleListModel : public QAbstractListModel { Q_OBJECT enum /*class*/ Roles { FIRST_NAME = Qt::UserRole, LAST_NAME }; public: SimpleListModel(QObject *parent=0); QVariant data(const QModelIndex &index, int role) const; Q_INVOKABLE int rowCount(const QModelIndex &parent = QModelIndex()) const; QHash roleNames() const; void addName(QString firstName, QString lastName); private: Q_DISABLE_COPY(SimpleListModel); QList m_items; }; ``` SimpleListModel.cpp ``` SimpleListModel::SimpleListModel(QObject *parent) : QAbstractListModel(parent) { DataObject *first…

Accepted Answer

you should call `beginInsertRows` and `endInsertRows` instead of emitting the signal

```
void SimpleListModel::addName(QString firstName, QString lastName)
{
    DataObject *dataObject = new DataObject(firstName, lastName);

// tell QT what you will be doing
    beginInsertRows(ModelIndex(),m_items.size(),m_items.size());

// do it
    m_items.append(dataObject);

// tell QT you are done
    endInsertRows();

}
```

these 2 functions emit all needed signals

QML view wont update when adding a new item to a QAbstractListModel based model

Solution

Problem