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

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:
> 
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> 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.
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> 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?
>  
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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?
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> The reason I ask is that this is can quite easily happen on a touch device when VoiceOver is not invoked.
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> Basically, I am wondering if a user using VoiceOver can use two fingers at the same time to operate separate objects.
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> For context, we work on interactive science and math simulations. For an example, you can have a look at Gravity Force Lab Basics. 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. 
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> On iOS with VoiceOver invoked, learners are restricted to move one sphere at a time with VoiceOver’s swipes and gestures.
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> 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.
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> 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.
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> 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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