def mouseDoubleClickEvent(self, event):
self._focused = not self._focused
if self._focused:
self.scene().setSceneRect(self.sceneBoundingRect())
else:
self.scene().setSceneRect(self.scene().itemsBoundingRect())
if len(self.scene().views()) > 0:
view = self.scene().views()[0]
view.fitInView(self.scene().sceneRect(), Qt.KeepAspectRatio)
QGraphicsEllipseItem.mouseDoubleClickEvent(self, event)
