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First Responder, NSUndoManager, and MyDocument

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First Responder, NSUndoManager, and MyDocument

Subject: First Responder, NSUndoManager, and MyDocument
From: Todd Heberlein <email@hidden>
Date: Wed, 23 Jul 2008 14:10:50 -0700

Just a intellectual curiosity question here:

I have a question about First Responder and the Document-based architecture. Why does "undo" go to the NSUndoManager and not my NSDocument subclass?

I was playing around with Hillegass's RaiseMan with Undo capabilities (Chap 9), and from looking at the call stack it appears that while the "Undo" menu is configured to go to the First Responder which I thought would be the MyDocument object, it instead it goes to MyDocument's NSUndoManager. Other menu items that I set up to go to the First Responder *do* make it to MyDocument, and even if I add my own -undo: method to MyDocument, selecting Undo in the menu will not call it.

What gives? Why doesn't an undo: message get sent to my MyDocument object?

Thanks,

Todd

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