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# Copyright (c) 2015 Ultimaker B.V.
# Uranium is released under the terms of the LGPLv3 or higher.
from UM.Scene.SceneNode import SceneNode
from . import Operation
from UM.Scene.Selection import Selection
from UM.Application import Application
class RemoveSceneNodeOperation(Operation.Operation):
"""An operation that removes a SceneNode from the scene."""
def __init__(self, node: SceneNode) -> None:
"""Initialises the RemoveSceneNodeOperation.
:param node: The node to remove.
"""
super().__init__()
self._node = node
self._parent = node.getParent()
def undo(self) -> None:
"""Undoes the operation, putting the node back in the scene."""
self._node.setParent(self._parent) # Hanging it back under its original parent puts it back in the scene.
def redo(self) -> None:
"""Redo the operation, removing the node again."""
old_parent = self._parent
self._node.setParent(None)
if old_parent and old_parent.callDecoration("isGroup"):
old_parent.callDecoration("recomputeConvexHull")
# Hack to ensure that the _onchanged is triggered correctly.
# We can't do it the right way as most remove changes don't need to trigger
# a reslice (eg; removing hull nodes don't need to trigger a reslice).
try:
Application.getInstance().getBackend().needsSlicing() # type: ignore
except AttributeError: # Todo: This should be removed, Uranium doesn't care or know about slicing!
pass
if Selection.isSelected(self._node): # Also remove the selection.
Selection.remove(self._node)
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