What are hSscroll, vScroll really?

Graham Samuel livfoss at mac.com
Sat Dec 8 14:50:19 CST 2012


Jacque

Actually, the concept of text scrolling within a field is universal, iMHO; the concept of any old collection of objects scrolling in a (possibly invisible) frame, less so. My problem, apart from general dumbness, was my inability to see that the two cases are essentially the same.

I agree about the iOS scroller issues, although I did read something about it perhaps in some early release notes. I think there may also be some subtleties to be explained about the possible values returned by scrollerDidScroll, if anyone wants to attempt a clearer write-up!

Thanks for the response, as ever.

Graham

On 8 Dec 2012, at 21:19, J. Landman Gay wrote:

> Since the concept is universal on all computers, I can understand why the docs don't specifically define it though I suppose it wouldn't hurt. What I do think is missing in the case of mobile scrollers is a specific statement about how it is a transparent overlay that only sends information about user actions; it doesn't actually manage objects on the card.
> 
> Before I answered the original question I did a search through the RR lessons and was surprised that iOS scrollers weren't addressed. Most other iOS concepts are there. Scrollers are widely used and there should be an entry in the lessons about it.



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