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

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#include <QBrush>
#include <QTime>
#include "mymodel.h"

//! [quoting mymodel_a]
MyModel::MyModel(QObject *parent)
    :QAbstractTableModel(parent)
{
//    selectedCell = 0;
    timer = new QTimer(this);
    timer->setInterval(1000);
    connect(timer, SIGNAL(timeout()) , this, SLOT(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)
    {
        if (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);
}
//! [quoting mymodel_b ]