How to manage multi QGraphicsItem

Hello,
I've a class Scene extending QGraphicsSceneand to catch click mouse i'm using the function mousePressEvent ( QGraphicsSceneMouseEvent* event ). This function is coded like:

Code:

---

void  Scene::mousePressEvent ( QGraphicsSceneMouseEvent* event ) {
  // set local variables and check if existing station clicked
  qreal x = event->scenePos().x();
  qreal y = event->scenePos().y();
 
  GraphItem _item = dynamic_cast<GraphItem*> ( itemAt ( x, y ) );
 
   if ( GraphItem == 0 && event->button() == Qt::LeftButton ) {
    m_undoStack->push ( new CommandGraphItemAdd ( this, x, y ) );
    emit message ( QString ( "GraphItem add at %1,%2" ).arg ( x ).arg ( y ) );
  }
 
  QGraphicsScene::mousePressEvent ( event );
  this->update();
}

---

My problem is how to create various QGraphicItem into the mousePressEvent function ? For example i click a button into menu option and a point is selecting, or a circle or other.
My solution is using a switch that reads a value (for example an int value, it set when a button is clicked), but for me isn't optimal solution. What do you think?Exist any different solution?
tnx so much

May be you could use factory pattern for creating the graphics items so that you could keep the changes minimal later.

JackHammer, I don't know this pattern and this is a way to learn a new thing about programming...so I’m looking for it.
Tnx so much for your answer. I'll inform you for news. Bye ;)