A couple years ago, I was able to debug Undo issues in documents by reading the _changeCount instance variable of an NSDocument. Although it was not exposed in the API, the offset of this instance variable could be determined by doing a class dump on AppKit.
But it seems that, starting with Mac OS X 10.7, NSDocument no longer has a _changeCount. Neighboring instance variables are still in there. This is kind of surprising. Although I understand that changes were made to support Auto Save and Versions, I don't think any of this affected the Undo architecture. According to the archived Release Notes [1], the last significant change to document undo was made with Mac OS X 10.5. It would be helpful if someone could explain what happened to the "change count" function in NSDocument. Is there a modern equivalent? Thanks, Jerry Krinock [1] https://developer.apple.com/library/mac/#releasenotes/Cocoa/AppKitOlderNotes.html _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
