QKeyEvent

[peace_comp]

Hi..
I would Like to use the keybord to generate events on my application ..but I still don't know how to use the QKeyEvent..
The idea is To zoom (translate ... ) on a View ( QGraphicsView) everytime we press on the Key (Up,Down,Right,Left) ..So I tried to create a methode for that Using QkeyEvent :

void myview::keyPressEvent(QKeyEvent *e){
     switch(e->key()){
      case Qt::Key_Left : 
          graphicsView->scale(1.2,1.2);
          break;
      case Qt::Key_Down :
       graphicsView->scale(1/1.2,1/1.2);
          break;
          }
          }

void myview::keyPressEvent(QKeyEvent *e){
     switch(e->key()){
      case Qt::Key_Left : 
          graphicsView->scale(1.2,1.2);
          break;
      case Qt::Key_Down :
       graphicsView->scale(1/1.2,1/1.2);
          break;
          }
          }

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but it dosnt work ( nothing happens when I press left or right Key) ??
Should I connect that methode to a specific SIGNAL ? if it the case wht signal should I use ?!!
Please if someOne have a idea ..
thanks