Re: NSDocument disc undo stack
Re: NSDocument disc undo stack
- Subject: Re: NSDocument disc undo stack
- From: Graham Cox <email@hidden>
- Date: Sat, 24 Mar 2012 12:04:30 +1100
You can read and write to the Application Support folder.
But FILES in an Undo stack? That makes little sense to me.
If you want to undo changes to a file, store the changes or the command that will cause the changes in the undo stack. If you are changing the organisation of files on disc then save a description of that organisation in the undo stack. You may want to read up on the way Cocoa utilises Undo, because it sounds like you might not have a good grasp on it.
Even if you need to store very large objects in the undo stack, unless you can prove it's a serious problem, just let the memory get paged to disk VM naturally. It's rare that users need to undo a very long history, so even if the older history is paged out, the chances are the user will never know.
--Graham
On 24/03/2012, at 10:17 AM, Steven wrote:
> Hello,
>
> Where is the correct place to store an on-disc undo stack associated with a NSDocument instance ?
> The stack may contain several potentially large files so we don't want them to occupy memory.
> For a compound document the stack could reside in a directory NSFileWrapper.
> For a single file document should a temporary directory be used ?
> I guess the chosen location may need to persist beyond the occurrence of the automatic termination feature.
> Any advice appreciated.
> Thanks.
>
> Steven.
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