Slot is not being used - c++

Question

I'm learning the signals/slots in Qt and I have found a problem. I need to create my own slot that is called when items on QGraphicsScene (in QGraphicsView) are moved or selected.
I'm starting with a simple app that has one widget and on it is graphicsView and label. I've created a slot in my window and connected it to QGraphicsScene's signal, but it is not being used. Where is my mistake?
Here is the code:
//MainWindow.h
//as generated by QtCreator, just added one slot to it
...omitted for brevity...
public slots:
void selectedItemChanged(QGraphicsItem * newItem, QgraphicsItem * oldItem);
..omitted for brevity...
//------------------------------------------------------------------
//MainWindow.cpp
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
QGraphicsScene * scene = new QGraphicsScene();
scene->setBackgroundBrush (QBrush(Qt::gray));
ui->graphicsView->setScene (scene);
for(int x = 10; x < 250; x+=20)
{
QGraphicsEllipseItem * item = scene->addEllipse (x,x,5,5,QPen(Qt::darkGreen),QBrush(Qt::darkGreen));
item->setFlag (QGraphicsItem::ItemIsFocusable,true);
}
QObject::connect (scene,SIGNAL(focusItemChanged),this,SLOT(selectedItemChanged));
}
void MainWindow::selectedItemChanged (QGraphicsItem *newItem, QGraphicsItem *oldItem)
{
qDebug()<<"called";
if(newItem == 0)
{
ui->label->setText ("Není vybrán bod");
}
else
{
ui->label->setText (QString::number (newItem->scenePos ().x ()) + "," + QString::number (newItem->scenePos ().y ()));
}
}
Now, when I run the probram it rins ok, but I cannot set Focus on the circles(ellipses) drawn on the scene and the slot is not used. I tried setting IsSelectable flag, but it does not help. Is there any other preferred way to get this done or solution to my problem?

Answer 1

You're not linking against the signal's right signature, according to the documentation:
void QGraphicsScene::focusItemChanged( QGraphicsItem * newFocus, QGraphicsItem * oldFocus,
Qt::FocusReason reason)
and also notice that you can check the connection's success/failure status via the bool return type of the QObject::connect method

Answer 2

So, in the end i found the answer to my own question. It was a mistake on my side.
in the connect() i used the slots without parenthesis/parameters. It should have looked like:
QObject::connect (scene,
SIGNAL(focusItemChanged(QGraphicsItem*,QGraphicsItem*,Qt::FocusReason)),
this,
SLOT(selectedItemChanged(QGraphicsItem*,QGraphicsItem*)));