gistfile1.txt

void QGraphicsScene::focusInEvent(QFocusEvent *focusEvent)
{
    Q_D(QGraphicsScene);

    d->hasFocus = true;
    switch (focusEvent->reason()) {
    case Qt::TabFocusReason:
        if (!focusNextPrevChild(true))
            focusEvent->ignore();
        break;
    case Qt::BacktabFocusReason:
        if (!focusNextPrevChild(false))
            focusEvent->ignore();
        break;
    default:
        if (d->lastFocusItem) {
            // Set focus on the last focus item
            setFocusItem(d->lastFocusItem, focusEvent->reason());
        }
        break;
    }
}