NicNici

void MyTextEdit::contextMenuEvent(QContextMenuEvent *event) {
    QPoint mousePos = event->pos();

    QTextCursor cursor = cursorForPosition(mousePos);
    int blockNumber = cursor.blockNumber(); 

    QMenu *menu = createStandardContextMenu();
    menu->addAction(QString("Строка: %1").arg(blockNumber + 1)); 
    menu->exec(event->globalPos());
    delete menu;
}