def create_widget(self):
self.scene = QGraphicsScene(self.parent_widget())
self.widget = ZoomingGraphicsView(self.parent_widget())
self.widget.setScene(self.scene)
self.widget.setDragMode(QGraphicsView.ScrollHandDrag)
self.widget.setRenderHints(QPainter.Antialiasing | QPainter.SmoothPixmapTransform | QPainter.HighQualityAntialiasing)
