pymel.core.system.undoInfo

undoInfo(*args, **kwargs)

This command controls the undo/redo parameters.

Modifications:

• when state is turned off, also clears pymel’s api undo queue

Flags:

Long name (short name)		Argument Types	Properties
closeChunk (cck)		bool
	Closes the chunk that was opened earlier by openChunk. Once close chunk is called, all undoable operations in the chunk will undo as a single undo operation. Use with CAUTION!! Improper use of this command can leave the undo queue in a bad state.
infinity (infinity)		bool
	Set the queue length to infinity.
length (l)		int
	Specifies the number of items in the undo queue. The infinity flag overrides this one.
openChunk (ock)		bool
	Opens a chunk so that all undoable operations after this call will fall into the newly opened chunk, until close chunk is called. Once close chunk is called, all undoable operations in the chunk will undo as a single undo operation. Use with CAUTION!! Improper use of this command can leave the undo queue in a bad state.
printQueue (pq)		bool
	Prints to the Script Editor the contents of the undo queue.
redoName (rn)		unicode
	Returns what will be redone (if anything)
redoQueueEmpty (rqe)		bool
	Return true if the redo queue is empty. Return false if there is at least one command in the queue to be redone.
state (st)		bool
	Turns undo/redo on or off.
stateWithoutFlush (swf)		bool
	Turns undo/redo on or off without flushing the queue. Use with CAUTION!! Note that if you perform destructive operations while stateWithoutFlush is disabled, and you then enable it again, subsequent undo operations that try to go past the destructive operations may be unstable since undo will not be able to properly reconstruct the former state of the scene.Flag can appear in Create mode of commandFlag can have multiple arguments, passed either as a tuple or a list.
undoName (un)		unicode
	Returns what will be undone (if anything)
undoQueueEmpty (uqe)		bool
	Return true if the undo queue is empty. Return false if there is at least one command in the queue to be undone.

Derived from mel command maya.cmds.undoInfo

Example:

import pymel.core as pm

import maya.cmds as cmds

# Turn undo on, with an infinite queue length
pm.undoInfo( state=True, infinity=True )
# Turn undo on, with a queue length of 200
pm.undoInfo( state=True, infinity=False, length=200 )
# Turn undo off
pm.undoInfo( state=False )
# Query the queue length
pm.undoInfo( q=True, length=True )
# Result: 200 #