void paintEvent(QPaintEvent *)
    {
        QPainter p(this);

        QString s = QString() + QChar(' ') + QChar('a') + QString(10, QChar::Nbsp) + QChar('a') + QChar(' ') + QChar('A');
        QString text = s + s + s + s + s + s + s + s + s + s + s + s + s + s ;
        QTextLayout layout(text);
        layout.beginLayout();

        qreal y = 0.0;
        while (1) {
            QTextLine line = layout.createLine();
            if (!line.isValid())
                break;

            line.setLineWidth(width());
            line.setPosition(QPointF(0, y));
            y += line.height();
        }
        layout.endLayout();

        layout.draw(&p, QPoint(0, 0));
    }