class UpDownMixin:
                def moveObjectsByDelta(self, ids, delta, subset_ids=None):
                        return 0

                def moveObjectsUp(self, ids, delta=1):
                        if not isinstance(ids, list):
                                self.move_object_up(ids)
                                return 1
                        for id in ids:
                                for i in range(delta):
                                        self.move_object_up(id)

                        return len(ids)

                def moveObjectsDown(self, ids, delta=1):
                        if not isinstance(ids, list):
                                self.move_object_down(ids)
                                return 1
                        for id in ids:
                                for i in range(delta):
                                        self.move_object_down(id)

                        return len(ids)

                def moveObjectsToTop(self, ids):
                        for id in ids:
                                self.move_object_to_top(id)

                        return len(ids)

                def moveObjectsToBottom(self, ids):
                        for id in ids:
                                self.move_object_to_bottom(id)

                        return len(ids)

                def orderObjects(self, key, reverse=None):
                        return 0

                def getObjectPosition(self, id):
                        return self.get_object_position(id)

                def moveObjectToPosition(self, id, position):
                        origpos = self.get_object_position(id)
                        self.move_object_to_position(id, position)

                        return abs(position - origpos)