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Re: PDFDocument subclass with an undo manager
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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

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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