Function
Used to decide to stored the changes to history
boolean
Set the history entry can be redo
boolean
set the history entry can be undo
Set the current entry object
Function
Used to intimate the group action is end
Function
Stores a history entry to history list
Function
Used for custom redo option
Used to store the redostack
number
Used to restrict or limits the number of history entry will be stored on the history list
Function
Used to intimate the group action is start
Function
Used for custom undo option
Used to store the undoStack