I am trying to use a QTimer with a mouseMoveEvent to highlight some cards. I do not know what I am doing wrong. If someone can give me some useful hints.

Qt Code: 
  1. //In Constructor
  2.     QTimer *timer = new QTimer(this);
  3.     connect(timer, SIGNAL(timeout()), this, SLOT(highlightCard()));
  4.     timer->start(500);
  5.  
  6. void Canvas::mouseMoveEvent(QMouseEvent *event)
  7. {
  8.     if (event->type() == QEvent::MouseMove)
  9.     {
  10.         x_pos = event->pos().x();
  11.         y_pos = event->pos().y();
  12.      }
  13. }
  14.  
  15. void Canvas::highlightCard()
  16. {
  17.     QGraphicsColorizeEffect *effect = new QGraphicsColorizeEffect(this);
  18.     effect->setColor(QPalette::Highlight);
  19.  
  20.     for (int i = 0; i < MAXCARDS; i++)
  21.     {
  22.         if (cardIconPlayer[i]->pos() == QPoint(x_pos, y_pos))
  23.             cardIconPlayer[i]->setGraphicsEffect(effect);
  24.     }
  25. }
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