QgraphicsView not align to center if setFixedSize

[GoldenAxe]

When I setFixedSize for my QgraphicsView he get align to the top left corner of the centralwidget, when I don't setFixeSize it's centered but the view is spread on the entire centralwidghet meaning if I set mouseMoveEvent to the (x,y) position it will work for the entire screen even the part of the screen which don't have any QGrpahicsItem paint on.

some test code I was trying (I was trying to set it inside a layout as well):

@m_mapView = new MapView(this);
m_mapView->setObjectName("map");
QGridLayout *mainLayout = new QGridLayout(this);
mainLayout->addWidget(m_mapView);
mainLayout->setAlignment(m_mapView, Qt::AlignCenter);
setLayout(mainLayout);
m_mapView->setAlignment(Qt::AlignCenter);
//this->setCentralWidget(m_mapView);
m_mapView->setFixedSize(wPixel, hPixel);@
....

• mapView is a custom QGraphicsView, maybe I need to implement something there that will make it align to the center?
• I know that the default align for QGraphicsView is center...but doesn't seems to work for me