Moving the GraphicsItem Moves outof scene, how to restrict the moving inside viewport

Hi,
I am using QGrphicsItem, QGraphicsScene and QGraphicsView, i have the QGrphicsItem movable flag enabled and i want the items movement to be restricted inside the scene, how to achieve the same??
i am using

Code:

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graphicsView->setScene(scene);
scene->setSceneRect(graphicsView->rect());

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