qt5base-lts/examples/tutorials/modelview/2_formatting/mymodel.cpp

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#include <QFont>
#include <QBrush>
#include "mymodel.h"
#include <QDebug>

MyModel::MyModel(QObject *parent)
    :QAbstractTableModel(parent)
{
}

int MyModel::rowCount(const QModelIndex & /*parent */) const
{
    return 2;
}

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

//! [Quoting ModelView Tutorial]
// mymodel.cpp
QVariant MyModel::data(const QModelIndex &index, int role) const
{
    int row = index.row();
    int col = index.column();
    // generate a log message when this method gets called
    qDebug() << QString("row %1, col%2, role %3")
            .arg(row).arg(col).arg(role);

    switch(role){
    case Qt::DisplayRole:
        if (row == 0 && col == 1) return QString("<--left");
        if (row == 1 && col == 1) return QString("right-->");

        return QString("Row%1, Column%2")
                .arg(row + 1)
                .arg(col +1);
        break;
    case Qt::FontRole:
        if (row == 0 && col == 0) //change font only for cell(0,0)
        {
            QFont boldFont;
            boldFont.setBold(true);
            return boldFont;
        }
        break;
    case Qt::BackgroundRole:

        if (row == 1 && col == 2)  //change background only for cell(1,2)
        {
            QBrush redBackground(Qt::red);
            return redBackground;
        }
        break;
    case Qt::TextAlignmentRole:

        if (row == 1 && col == 1) //change text alignment only for cell(1,1)
        {
            return Qt::AlignRight + Qt::AlignVCenter;
        }
        break;
    case Qt::CheckStateRole:

        if (row == 1 && col == 0) //add a checkbox to cell(1,0)
        {
            return Qt::Checked;
        }
    }
    return QVariant();
}
//! [Quoting ModelView Tutorial]