How to make scrollbarscroll during MouseMoveEvent?

Question

There is no scrollbar set aside from the view's default. Image that is displayed is large therefore scorllbar appears. I want scrolling to happen whenever position changes. Say when mousePressed an object called lastposition(x,y) is stored. If mouse is moved, lastposition(x,y) will be changed, therefore scrolling should appear. The code so far is:

class MainWindow(self, MainWindow):

        self.scene = QGraphicsScene()
        self.view = MyGraphicsView(self.scene, parent=self)
        self.view.rubberBandRectGiven.connect(self.cropEnd)
        self.view.horizontalScrollBar().valueChanged.connect(self.sceneMoved)
        self.view.verticalScrollBar().valueChanged.connect(self.sceneMoved)

def sceneMoved(self):
     sceneRect = self.view.mapToScene(self.view.rect()).boundingRect()
     self.chooseImage(east, north, int(abs(sceneRect.x())), int(abs(sceneRect.y())), sceneRect.width(), sceneRect.height())
     self.resizeScene()
     if self.hasGrid:
       self.drawGrid()


class MyGraphicsView(QGraphicsView):

rubberBandRectGiven = pyqtSignal(QRect)

def __init__(self, scene, parent=None):
    super().__init__(scene, parent)
    self.main = parent
    self.setMouseTracking(True)
    self.pos1 = QPoint()
    self.rubberBand = QRubberBand(QRubberBand.Rectangle, self)
    self.rubberBand.hide()
    self.rubberBandActive = False
    return

def mousePressedEvent(self, event):
.....
             posScene = self.mapToScene(event.pos())
             (self.lastPositionx, self.lastPositiony) = (int(posScene.x()), int(posScene.y()))
......



def mouseMoveEvent(self, event):
        p = self.parent()`     #MainWindow
        posScene = self.mapToScene(event.pos())
        (x, y) = (int(posScene.x()), int(posScene.y()))

            if (self.lastPositionx-x ==0) and (self.lastPositiony-y!=0):
                p.view.verticalScrollBar().setValue(100)
            if (self.lastPositionx-x !=0) and (self.lastPositiony-y==0):
                p.view.horizontalScrollBar().setValue(100)
            if  (self.lastPositionx-x !=0) and (self.lastPositiony-y!=0):
                p.view.horizontalScrollBar().setValue(100)
                p.view.verticalScrollBar().setValue(100)

But it doesn't scroll. Is there a way to make scrolling to happen?