> On 2015/05/11, at 20:41, Graham Cox <graham....@bigpond.com> wrote:
> 
> Aha… I do see those. They were not the subject of the WWDC video I watched - 
> maybe dangerwill was referring to a different one? These look potentially 
> useful, I’ll check them out.
> 
> ―Graham

You had the right video I believe. The trick is it is dense material and they 
talk like it's all about the scroll view hierarchy but in fact scrolling input 
is implemented at the NSView level. 
The NSScrollView hierarchy manages scrollers, rubberbanding and positioning of 
a view inside of a clipview. The document view is the view that receives and 
handles all the events and the reason NSView has an enclosingScrollView method, 
so it can talk to it if it's there. 
The docs don't frame it up like this but it's real. :)
Controls are perfect use cases. 


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