Re: PDFDocument subclass with an undo manager
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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