Posted just before an NSUndoManager object performs an undo operation.
undo
undoNestedGroup
NSUndoManager
userInfo
Available in Mac OS X v10.0 and later.
Declaration Syntax
Version Information
- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)