qt5base-lts/examples/widgets/tutorials/modelview/3_changingmodel/mymodel.cpp

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#include "mymodel.h"

#include <QTime>

//! [quoting mymodel_a]
MyModel::MyModel(QObject *parent)
    : QAbstractTableModel(parent)
    , timer(new QTimer(this))
{
    timer->setInterval(1000);
    connect(timer, &QTimer::timeout , this, &MyModel::timerHit);
    timer->start();
}
//! [quoting mymodel_a]
//-------------------------------------------------------
int MyModel::rowCount(const QModelIndex & /*parent */) const
{
    return 2;
}

//-------------------------------------------------------
int MyModel::columnCount(const QModelIndex & /*parent */) const
{
    return 3;
}

//-------------------------------------------------------
//! [quoting mymodel_QVariant ]
QVariant MyModel::data(const QModelIndex &index, int role) const
{
    int row = index.row();
    int col = index.column();

    if (role == Qt::DisplayRole && row == 0 && col == 0)
        return QTime::currentTime().toString();

    return QVariant();
}
//! [quoting mymodel_QVariant ]
//-------------------------------------------------------
//! [quoting mymodel_b ]
void MyModel::timerHit()
{
    //we identify the top left cell
    QModelIndex topLeft = createIndex(0,0);
    //emit a signal to make the view reread identified data
    emit dataChanged(topLeft, topLeft, {Qt::DisplayRole});
}
//! [quoting mymodel_b ]