On 29 Aug 2014, at 3:56 pm, Graham Cox <graham....@bigpond.com> wrote:

> You might wonder if I already know the type why this is even useful.


Having given this a lot more thought, I think it's simpler just to break down 
the compound properties into singular ones on the target object. These can be 
derived from the compound ones and using +keyPathsForValuesAffecting<Key>, it's 
easy to trigger notifications off of these derived properties. Since I only 
have a few of these compound properties, it's not too much work to add derived 
singular properties and design my UI controller around those.

I think the takeaway from the exercise for me is don't use properties returning 
points, sizes or rects if you want to eventually hook these up to a UI.

--Graham



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