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# Copyright (c) 2018 Ultimaker B.V.
# Uranium is released under the terms of the LGPLv3 or higher.
from typing import List, TYPE_CHECKING
import typing
if TYPE_CHECKING:
from UM.Scene.SceneNode import SceneNode
class Iterator:
"""Abstract iterator class."""
def __init__(self, scene_node: "SceneNode") -> None:
super().__init__() # Call super to make multiple inheritance work.
self._scene_node = scene_node
self._node_stack = [] # type: List[SceneNode]
self._fillStack()
def _fillStack(self) -> None:
"""Fills the list of nodes by a certain order. The strategy to do this is to be defined by the child."""
raise NotImplementedError("Iterator is not correctly implemented. Requires a _fill_stack implementation.")
def __iter__(self) -> typing.Iterator["SceneNode"]:
return iter(self._node_stack)
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