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Re: PDFDocument subclass with an undo manager

Subject: Re: PDFDocument subclass with an undo manager
From: Graham Cox <email@hidden>
Date: Tue, 1 Jul 2008 11:23:30 +1000
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It won't redo because when it performs the undo, it is calling - initWithData: directly, and I take it from this snippet that initWithData: isn't recording the undo.

You need to create a wrapper method for initWithData that contains the undo recording step, then make that method the target of the undo, something like:

- (void) myInitWithData:(NSData*) newData { [[undoManager prepareWithInvocationTarget:self] myInitWithData:[self oldData]]; [self initWithData:newData]; }


hth,

cheers, Graham


On 1 Jul 2008, at 9:02 am, Kevin Ross wrote:

Hi everyone, I have a question that might seems a little silly. I have a PDFDocument subclass which can perform page impositions. I would also like to be able to undo the impositions. In the methods I have this when I make the change to the PDF:

[[undoManager prepareWithInvocationTarget:self] initWithData:[self dataRepresentation]]; [self initWithData:(NSData *)newPDFData];
When I call -undo: later, it works, but I can't get it to -redo:
Is what I'm trying to do even possible this way ? Is there a better way?
Thanks for any pointers and/or suggestions!!
Kevin
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References:
	>PDFDocument subclass with an undo manager (From: Kevin Ross <email@hidden>)

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