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Proposed reply to issue 505 (Pointer Gestures, use of single pointer activation language)

From: Detlev Fischer <detlev.fischer@testkreis.de>
Date: Tue, 10 Oct 2017 11:46:03 +0200 (CEST)
To: w3c-wai-gl@w3.org
Message-Id: <20171010094603.AC95A3D00549@dd24924.kasserver.com>
I have drafted (and posted) a reply to the comment #505 "Pointer Gestures: Clarify the term "pointer gesture". My reply is basically begging for time because a few things need clarification before we can nail down the definition of pointer gesture:


The commenter suggests to simplify the SC language by using the defined term 'single pointer activation' that is already in the glossary, so the SC text would become 

"All functionality can be operated with an untimed single-pointer activation unless a multipoint or timed gesture is essential."

At the occasion of checking the definition of 'single pointer activation', I noted that we may want to improve the language: currently, we have 'one point of contact with the screen' which does not really include the idea that something gets activated - but I'll make that a separate issue.

A definitive reply at this point in time so difficult because other issues have been raised:

1. Does the current SC language constitute an overreach because it would also require that all functions that can be activated via the keyboard can also be activated via the pointer? (see mailing list discussion yesterday, 9. October). I thought that was the intention, but others believe this is asking too much.
2. Do we need to create an exception for secondary activation behaviour of controls triggered by long presses (see James Nurthen's comment https://github.com/w3c/wcag21/issues/495 )

If we decide that the behaviour cited by James (a control doing one thing on untimed single point activation and another thing after a long press) is so common that we should not try to ask for alternatives, the SC text would need some exception language, and the reference to single point activation would not work (because we may have two different activations happening depending on the duration between "down-event" and "up-event").

So an exception may
A. allow secondary activation by long presses (arguing that once the pointer is over the target, holding is easier than other complex multi-finger, swiping or piching gestures), or
B. draw a distinction beteen essential (neccessary for completion) functions to which the SC language would apply, and everything else (James called it 'incidental functions')



Detlev Fischer
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Thedestr. 2, 22767 Hamburg

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Received on Tuesday, 10 October 2017 09:46:28 UTC

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