Re: Bi-modal touch interaction, possible with Voice Over enabled?

Hi Taliesin,

Your demo already passes 2.5.1 Pointer Gestures because moving "mass 1" or
"mass 2" gives an equivalent result, compared with moving both masses
simultaneously.

That said, it might be interesting to attach a custom zoom or scroll
behavior to a specific target, such as the "x km" distance value. Is there
such a thing as pedagogical sugar?

Mitchell Evan
+1 (510) 375-6104
mtchllvn@gmail.com
Twitter @mitchellrevan
https://www.linkedin.com/in/mitchellrevan/


On Fri, Jul 10, 2020 at 12:43 AM <talilief@gmail.com> wrote:

> Thanks Dave. I’d be interested in knowing more about split taps as we
> investigate alternatives.
>
> Thanks for a lead.
> Taliesin
>
> Sent from my iPhone
>
> On Jul 9, 2020, at 15:07, Andrews, David B (DEED) <
> david.b.andrews@state.mn.us> wrote:
>
> 
>
> I am not an ARIA expert, but I am not aware of anything like that in iOS.
> There are some so-called “split taps” where you hold down one finger, and
> tap with a second – but they are for the same control – not two different
> areas simultaneously.
>
>
>
> Dave
>
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>
>
> *From:* Taliesin Smith <talilief@gmail.com>
> *Sent:* Thursday, July 9, 2020 10:30 AM
> *To:* w3c-wai-ig@w3.org
> *Subject:* Bi-modal touch interaction, possible with Voice Over enabled?
>
>
>
> *This message may be from an external email source.*
>
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>
> ------------------------------
>
> Hi Folks,
>
>
>
> Do any aria experts on this list know if it is possible to create a custom
> touch interaction where 2 interaction points would be operational
> simultaneously on an iOS device using VoiceOver?
>
>
>
> The reason I ask is that this is can quite easily happen on a touch device
> when VoiceOver is not invoked.
>
>
>
> Basically, I am wondering if a user using VoiceOver can use two fingers at
> the same time to operate separate objects.
>
>
>
> For context, we work on interactive science and math simulations. For an
> example, you can have a look at Gravity Force Lab Basics
> <https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fphet.colorado.edu%2Fen%2Fsimulation%2Fgravity-force-lab-basics&data=02%7C01%7Cdavid.b.andrews%40state.mn.us%7Ca077a065c50d4a2f5f3008d8241dc211%7Ceb14b04624c445198f26b89c2159828c%7C0%7C0%7C637299057517683932&sdata=C1xIzmhBT2m3Wzn3aFucpSrG1KHgYzV0GeUC41PuysE%3D&reserved=0>.
> This interactive simulation has two mass spheres. When a screen reader is
> not invoked, a learner can actually place one finger on mass 1 (the blue
> sphere) and another finger on mass 2 (the red sphere), and move the two
> spheres at the same time.
>
>
>
> On iOS with VoiceOver invoked, learners are restricted to move one sphere
> at a time with VoiceOver’s swipes and gestures.
>
>
>
> For this simulation, that is completely fine. It’s not important to move
> the spheres at the same time. We are working on a new simulation about
> ratio and proportion where moving two objects at the same time is more
> important.
>
>
>
> We have a custom interaction accessible to keyboard users, but I wanted to
> reach out about iOS and VoiceOver, specifically, because from our own
> investigations we don’t think it is possible.
>
>
>
> Thoughts from this list are always much appreciated.
>
>
>
> Taliesin Smith
>
> talilief@gmail.com
>
>
>
> ~.~.~
> Also reachable at:
>
> Taliesin.Smith@colorado.edu
> Inclusive Design Researcher
> PhET Interactive Simulations
> https://phet.colorado.edu/en/accessibility
> Physics Department
> University of Colorado, Boulder
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