Repeter une action a chaque bout de temps

 #include "mafenetre.h"
#include <QTime>
#include <time.h>
 
MaFenetre::MaFenetre() : QWidget()
{
    setFixedSize(300, 150);QTime tim; srand(time(0));
 
 
    // Construction du bouton
    m_bouton = new QPushButton("Bonjour !", this);
 
    m_bouton->setFont(QFont("Comic Sans MS", 14));
    m_bouton->setCursor(Qt::PointingHandCursor);m_bouton->setToolTip("Aide");
    tim.start();
    m_bouton->move(rand()%300,rand()%150);
    if (tim.elapsed()>2000)
    {
        tim.restart();
        m_bouton->move(rand()%300,rand()%150);
    }
 
}