After changing the model value, the tableview value is changed, but the chart is the same.

[IknowQT]

CustomTableModel::CustomTableModel(QObject *parent) :
    QAbstractTableModel(parent)
{
    m_columnCount = 6;
    m_rowCount = 12;

    //// m_data
    for (int i = 0; i < m_rowCount; i++) 
    {
        QVector<qreal>* dataVec = new QVector<qreal>(m_columnCount);
        m_data.append(dataVec);
    }
    //    for (int k = 0; k < dataVec->size(); k++) {
    //        if (k % 2 == 0)
    //            dataVec->replace(k, i * 50 + QRandomGenerator::global()->bounded(20));
    //        else
    //            dataVec->replace(k, QRandomGenerator::global()->bounded(100));
    //    }
    //    m_data.append(dataVec);
    //}
}

CustomTableModel::~CustomTableModel()
{
    qDeleteAll(m_data);
}

int CustomTableModel::rowCount(const QModelIndex &parent) const
{
    Q_UNUSED(parent)
    return m_data.count();
}

int CustomTableModel::columnCount(const QModelIndex &parent) const
{
    Q_UNUSED(parent)
    return m_columnCount;
}

QVariant CustomTableModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if (role != Qt::DisplayRole)
        return QVariant();

    if (orientation == Qt::Horizontal)
        return QString("201%1").arg(section);
    else
        return QString("%1").arg(section + 1);
}

QVariant CustomTableModel::data(const QModelIndex &index, int role) const
{
    if (role == Qt::DisplayRole) {
        return m_data[index.row()]->at(index.column());
    } else if (role == Qt::EditRole) {
        return m_data[index.row()]->at(index.column());
    } else if (role == Qt::BackgroundRole) {
        for (const QRect &rect : m_mapping) {
            if (rect.contains(index.column(), index.row()))
                return QColor(m_mapping.key(rect));
        }

        // cell not mapped return white color
        return QColor(Qt::white);
    }
    return QVariant();
}

bool CustomTableModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    if (index.isValid() && role == Qt::EditRole) {
        m_data[index.row()]->replace(index.column(), value.toDouble());
        emit dataChanged(index, index);
        return true;
    }
    return false;
}

Qt::ItemFlags CustomTableModel::flags(const QModelIndex &index) const
{
    return QAbstractItemModel::flags(index) | Qt::ItemIsEditable;
}

void CustomTableModel::addData(int nRow, int nCol, int data)
{
    //QVector<qreal>* dataVec = new QVector<qreal>(m_columnCount);
    //m_data
}

void CustomTableModel::addMapping(QString color, QRect area)
{
    m_mapping.insertMulti(color, area);
}

TableWidget::TableWidget(QWidget *parent)
    : QWidget(parent)
{
    // create simple model for storing data
    // user's table data model
    //! [1]
    m_model = new CustomTableModel;
    //! [1]

    //! [2]
    // create table view and add model to it
    QTableView *tableView = new QTableView;
    tableView->setModel(m_model);
    tableView->setMinimumWidth(300);
    tableView->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
    tableView->verticalHeader()->setSectionResizeMode(QHeaderView::Stretch);
    m_model->setParent(tableView);
    //! [2]

    //! [3]
    QChart *chart = new QChart;
    chart->setAnimationOptions(QChart::AllAnimations);
    //! [3]

    // series 1
    //! [4]
    //QBarSeries *series = new QBarSeries;
    QLineSeries* series = new QLineSeries;

    int first = 3;
    int count = 5;
    //QVBarModelMapper *mapper = new QVBarModelMapper(this);
    //mapper->setFirstBarSetColumn(1);
    //mapper->setLastBarSetColumn(4);

    QVXYModelMapper *mapper = new QVXYModelMapper(this);
    mapper->setXColumn(0);
    mapper->setYColumn(1);
    mapper->setSeries(series);
    mapper->setModel(m_model);
    chart->addSeries(series);

    QVXYModelMapper* mapper2 = new QVXYModelMapper(this);
    QLineSeries* series2 = new QLineSeries;
    mapper2->setXColumn(2);
    mapper2->setYColumn(3);
    mapper2->setSeries(series2);
    mapper2->setModel(m_model);
    chart->addSeries(series2);

    /*series->setBrush(QBrush(QColor(255, 0, 0)));
    mapper = new QVXYModelMapper(this);
    mapper->setXColumn(2);
    mapper->setYColumn(3);
    mapper->setSeries(series);
    mapper->setModel(m_model);
    chart->addSeries(series);*/
    //! [4]

    //! [5]
    // for storing color hex from the series
    QString seriesColorHex = "#000000";

    // get the color of the series and use it for showing the mapped area
  /*  QList<QBarSet *> barsets = series->barSets();
    for (int i = 0; i < barsets.count(); i++) {
        seriesColorHex = "#" + QString::number(barsets.at(i)->brush().color().rgb(), 16).right(6).toUpper();
        m_model->addMapping(seriesColorHex, QRect(1 + i, first, 1, barsets.at(i)->count()));
    }*/
    //! [5]

    //! [6]
    QStringList categories;
    categories << "April" << "May" << "June" << "July" << "August";
    /*QBarCategoryAxis *axisX = new QBarCategoryAxis();
    axisX->append(categories);
    chart->addAxis(axisX, Qt::AlignBottom);
    series->attachAxis(axisX);
    QValueAxis *axisY = new QValueAxis();
    chart->addAxis(axisY, Qt::AlignLeft);
    series->attachAxis(axisY);*/

    QValueAxis* axisX = new QValueAxis();
    axisX->setRange(0, 100);
    axisX->setTickCount(10);

    QValueAxis* axisY = new QValueAxis();
    axisY->setRange(0, 100);
    axisY->setTickCount(10);

    chart->setAxisX(axisX);
    chart->setAxisY(axisY);

    //! [6]

    //! [7]
    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);
    chartView->setMinimumSize(640, 480);
    //! [7]

    //! [8]
    // create main layout
    QGridLayout *mainLayout = new QGridLayout;
    mainLayout->addWidget(tableView, 1, 0);
    mainLayout->addWidget(chartView, 1, 1);
    mainLayout->setColumnStretch(1, 1);
    mainLayout->setColumnStretch(0, 0);
    setLayout(mainLayout);
    //! [8]

}

I'm looking at a custom table example.
Initialize data to 0 when creating a model and double-click in the table to change it. Table data is changed, but charts are not drawn.

Replacing m_data through setdata works normally. But the chart doesn't change.

[SGaist]

Hi,

Are you using this example ?

[IknowQT]

you're right. I modified this example a bit.
I am trying to insert data sequentially by modifying m_data containing data from the beginning, but the chart does not respond.

https://forum.qt.io/topic/137543/update-problem-when-putting-data-into-qstandardmodel/3
Let's discuss this topic together