I get he impression that Qgrapchiscene and Qgrapchisview are sometimes redundant ?

At diagramscene example I see :

Code:

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scene->update();
 view->update();

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I also see :

Code:

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DiagramScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)

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The model-view applied to this is some confused.....
It is as the two objects were sharing something ....
Who is the responsible of draw ?
Can I create a mix - object ? (On object with the mixed of both)
Is it possible ? It is a bad - good idea ?

Any explication?
Thanks

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Who is the responsible of draw ?

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The view is the only thing doing any drawing. As the QGraphicsScene docs say:

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Note that QGraphicsScene has no visual appearance of its own; it only manages the items. You need to create a QGraphicsView widget to visualize the scene.

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Mouse events on the view are translated into their equivalent event in the scene and forwarded, which is why the scene has these events.

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Can I create a mix - object ? (On object with the mixed of both)

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You have to have a scene and a view (or views) somewhere. If they are both member variables of, for example, the main window class then that makes sense (but is not mandatory).