Mouse press event Qt::LeftButton not working (touchpad)

Hi, tell me please is it bug or maybe I doing something wrong... ?

Code:

---

void mousePressEvent(QMouseEvent * event)
{
    if(event->button() == Qt::LeftButton){
        qDebug() << "left"; //not working
    }else if (event->button() == Qt::RightButton){
        qDebug() << "right"; //working
    }
    event->ignore();
}

---