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Combine multiple sources into an NSOutlineView using NSTreeController

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Combine multiple sources into an NSOutlineView using NSTreeController

Subject: Combine multiple sources into an NSOutlineView using NSTreeController
From: Marcel Philipp Harris <email@hidden>
Date: Wed, 22 Apr 2009 18:01:06 +0200

Hello, in my app, I have an outline view that is bound to an NSTreeController, which is connected to a Core Data entity. It works like a charm, but I would like to add category headings to the outline views categories and possibly even add some sources unrelated to the Core Data model.

Is this possible in any way without resorting to reimplementing NSTreeController from scratch? I've thought about subclassing NSTreeController, but to be honest, I don't really understand how it interoperates with an NSOutlineView. It seems not to act as a conventional data source, as it apparently doesn't implement the methods defined in the corresponding protocol (I may be wrong here, maybe they're implemented privately).

Any pointers much appreciated.

---
Marcel Hansemann
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