QGraphicsView coordinate to QGraphicsScene

[nilot]

Hello,

In my custom QGraphicsScene class, I display the following two values :

void MainScene::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
        qDebug()<<views()[0]->mapToScene(event->screenPos());
        qDebug()<<event->scenePos(); // not equal to the previous value
	QGraphicsScene::contextMenuEvent(event);
}

void MainScene::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
        qDebug()<<views()[0]->mapToScene(event->screenPos());
        qDebug()<<event->scenePos(); // not equal to the previous value
	QGraphicsScene::contextMenuEvent(event);
}

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I don't understand why the two values are different. How can I map event->screenPos() to scene coordinates correctly ?

Thank you