On 12/05/2010, at 2:51 PM, aaron smith wrote:

> To me the first "localPoint = ..." should be the correct way to
> convert the windowPoint to the control views' coordinate space. But
> it's never right.
> 
> Any ideas?

> localPoint = [[self controlView] convertPoint:windowPoint toView:nil];


You're working way too hard. Also, your first localPoint= is exactly the wrong 
way around. It should be:


NSPoint localPoint = [controlView convertPoint:[event locationInWindow] 
fromView:nil];

that should be all you need to do. As I understand it, a cell's -controlView 
method might not return the control view reliably, so you are better off using 
the view passed to the method as a parameter.

All that convertScreenToBase stuff you're doing is superfluous AFAICS.

--Graham


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