September 2002
Intermediate to advanced
1272 pages
31h 12m
English
Content preview from Cocoa® Programming
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Undo and Redo
The Application Kit includes a powerful and flexible system to implement undo and redo operations by taking advantage of the Objective-C runtime to record the messages sent to objects and play them back later. Many Application Kit classes including the text management views already implement undo and redo.
Each instance of the NSDocument class optionally includes an instance of NSUndoManager. The NSUndoManager class stores recorded messages and works with the standard Undo and Redo menu items. NSUndoManager is actually part of the Foundation framework because nongraphical applications might include undoable operations. The NSUndoManager class can be used without the NSDocument class and visa versa, but using them together automatically ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.