April 2015
Intermediate to advanced
556 pages
17h 47m
English
book
Cocoa Programming for OS X: The Big Nerd Ranch Guide
by Aaron Hillegass, Adam Preble, Nate Chandler
Content preview from Cocoa Programming for OS X: The Big Nerd Ranch Guide
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How the NSUndoManager Works
Suppose that the user opens a new RaiseMan document and makes three edits:
-
Inserts a new record
-
Changes the name from
New EmployeetoJohn Locke -
Changes the raise from 5 to 20
To support undo, as each edit is performed your controller will add an invocation that would undo that edit to the undo stack. For the sake of simplifying the prose, let’s say, “The inverse of the edit gets added to the undo stack.”
Figure 11.1 shows what the undo stack would look like after these three edits.
Figure 11.1 The undo stack
If the user now chooses the Undo menu item, the first invocation is taken ...
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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.