When the user enters or exits Versions, there are notifications sent out called 
NSWindowWillEnterVersionBrowserNotification, 
NSWindowDidEnterVersionBrowserNotification, etc. (see NSWindow.h)

You will know when a user chooses Restore, because the NSDocument instance will 
be sent -revertToContentsOfURL:ofType:error: (once the version's contents are 
written in place over the existing file).

[kevin perry];

On Jun 25, 2012, at 1:44 PM, qvacua <qva...@gmail.com> wrote:

> Hi,
> 
> are there notifications or delegate methods of NSDocument (or
> NSDocumentController) which are called when the user invokes Versions
> and/or restores a version of a document?
> 
> Thanks in advance and best,
> Tae
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