RE: UndoManager
RE: UndoManager
- Subject: RE: UndoManager
- From: Jeff Knee <email@hidden>
- Date: Fri, 15 Nov 2002 10:17:55 -0500
Craig,
On Thursday, November 14, 2002, at 09:47 PM,
email@hidden wrote:
I think I understand how to register the selector and
object with the NSUndoManager, yet in the Sketch.app I see this-
[snipped code]
This brings up many questions in my average IQ type head, firstly I
can't find the instance or function definition of undoManager that
[self undoManager] , so is this an inherited method?
Yes, it comes from inheritance:
@interface SKTDrawDocument : NSDocument
NSDocument has an undoManager method.
I am assuming that
[self undoManager] is a getter. I mean, it has to be. So, were is the
get, in NSDocument?
Also, I am trying to make the distinction between [[undoMangager
prepareWithInvocationTarget: self] someMethod: ], and [undoManager
registerUndoWithTarget: self selector:@selector( ) object: ]; Both
of these methods need to register the state that the object was in
before the edit, cut, copy, or paste occured, right? So, what is the
difference?
Take a peek at the docs at:
file:///Developer/Documentation/Cocoa/TasksAndConcepts/
ProgrammingTopics/UndoArchitecture/Tasks/RegisteringUndo.html
Try re-writing one of them to use the undoManager method that it isn't
using...
+= Jeff Knee
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