Re: UndoManager
Re: UndoManager
- Subject: Re: UndoManager
- From: Dustin Voss <email@hidden>
- Date: Sun, 17 Nov 2002 22:25:38 -0800
On Thursday, November 14, 2002, at 03:45 AM, Craig Bakalian wrote:
Hi,
Still coding away at my music notation app. I was just about finished
the Data Model Classes when bam!, I realized I need redo and undo in
the app. I went for a walk through the SKTDrawDocument in the
Sketch.app. I think I understand how to register the selector and
object with the NSUndoManager, yet in the Sketch.app I see this-
- (void)insertGraphic:(SKTGraphic *)graphic atIndex:(unsigned)index {
[[[self undoManager] prepareWithInvocationTarget:self]
removeGraphicAtIndex:index];
[_graphics insertObject:graphic atIndex:index];
[graphic setDocument:self];
[self invalidateGraphic:graphic];
}
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? I am assuming that
[self undoManager] is a getter. I mean, it has to be. So, were is the
get, in NSDocument?
It is actually declared in NSResponder. NSDocument and NSWindow both
override NSResponder's implementation to return an NSUndoManager, but
NSWindow checks its delegate first, which (in a document window) will
be NSWindowController, and NSWindowController will check with its
NSDocument instance.
(Disclaimer: This is from memory, so I may be wrong.)
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| References: | |
| | >UndoManager (From: Craig Bakalian <email@hidden>) |