Question

This object maintains the undo stack for an EditSession.

Constructors

• new UndoManager()

Resets the current undo state and creates a new UndoManager.

Methods

• UndoManager.execute(Object options)

Provides a means for implementing your own undo manager. options has one property, args, an Array, with two elements:

• args[0] is an array of deltas
• args[1] is the document to associate with

options

Object

Required. Contains additional properties

• UndoManager.hasRedo()
• 返回值： Boolean

Returns true if there are redo operations left to perform.

• UndoManager.hasUndo()
• 返回值： Boolean

Returns true if there are undo operations left to perform.

• UndoManager.redo(Boolean dontSelect)

Perform a redo operation on the document, reimplementing the last change.

dontSelect

Boolean

Required. If true, doesn't select the range of where the change occurred

• UndoManager.reset()

Destroys the stack of undo and redo redo operations.

• UndoManager.undo(Boolean dontSelect)
• 返回值： Range

Perform an undo operation on the document, reverting the last change.

dontSelect

Boolean

Required. If true, doesn't select the range of where the change occurred