pymel.core.system.UndoChunk¶

digraph inheritance70196884d5 { rankdir=TB; ranksep=0.15; nodesep=0.15; size="8.0, 12.0"; "UndoChunk" [fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",URL="#pymel.core.system.UndoChunk",style="setlinewidth(0.5)",tooltip="Context manager for encapsulating code in a single undo.",height=0.25,shape=box,fontsize=8]; }

class UndoChunk¶

Context manager for encapsulating code in a single undo.

Use in a with statement Wrapper for cmds.undoInfo(openChunk=1)/cmds.undoInfo(closeChunk=1)

>>> import pymel.core as pm
>>> pm.ls("MyNode*", type='transform')
[]
>>> with pm.UndoChunk():
...     res = pm.createNode('transform', name="MyNode1")
...     res = pm.createNode('transform', name="MyNode2")
...     res = pm.createNode('transform', name="MyNode3")
>>> pm.ls("MyNode*", type='transform')
[nt.Transform(u'MyNode1'), nt.Transform(u'MyNode2'), nt.Transform(u'MyNode3')]
>>> pm.undo() # Due to the undo chunk, all three are undone at once
>>> pm.ls("MyNode*", type='transform')
[]