On Jul 12, 2009, at 10:10 AM, John Nairn wrote:
I added an option to cancel some action in the middle of the action. The most convenient coding was to implement the cancel by calling undo in the NSUndoManager, but this adds a "Redo" action to redo the partial or incomplete changes (and leaves the data in a poor state).
That doesn't sound convenient at all. :-)
I can either re-code the change process or for an alternative, is there a way to perform to top level undo without having it moved to the redo stack? Or, similarly, is there a way to perform an undo and then remove the top most item in the redo stack?
Don't break / short-circuit the Undo/Redo mechanism on purpose. This is poor design. Redesign your approach to canceling the operation. If you need help on that approach, post the specifics.
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