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Re: [pointerevents] pointerType: 'dial'

From: Doug Schepers via GitHub <sysbot+gh@w3.org>
Date: Mon, 31 Oct 2016 23:04:21 +0000
To: public-pointer-events@w3.org
Message-ID: <issue_comment.created-257445939-1477955060-sysbot+gh@w3.org>
I agree that it may be useful for us to define a set of events related
 to a dial input, and adding a "dial" `pointerType` seems reasonable 
to me.

Most of the specific functions are already defined using pre-existing 
events, though, and we should only define those things that are unique
 to the dial, or define a dial's characteristics in existing terms. 
Effectively, it's a mouse with rotation, much like a mouse with a 
mousewheel.

- `x`, `y`: this would be the centerpoint of the dial.
- size/radius/contact geometry would be available the same way it is 
with normal pointer events: `event.target.style.width` and 
`event.target.style.height`.
- rotation should be defined as `deltaX`, `deltaY`, or `deltaZ` 
(depending on the axis mode), as defined in [UI 
Events](https://www.w3.org/TR/uievents/#events-wheelevents).
- orientation is a possible property we could look at, though I don't 
think it's distinguishable from the rotation.
- `zoom` (and `pan`) is something we've long had in SVG documents, and
 I think this is a property of the element or document more than an 
event; to the extent that it's expressed in events, I think it 
corresponds to `deltaZ`.
- `press and hold` seems like it could be expressed as a 
`longkeypress` (though I don't see that in UI Events anymore)

Can you think of any specific aspect of a dial that can't be expressed
 in a predefined way?

Notably, you don't have to have a physical dial for these types of 
event properties to be used; in a AR/VR environment, it could be 
mapped to some specific gestures (e.g. extending the fingers and 
twisting the hand). 



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Received on Monday, 31 October 2016 23:04:27 UTC

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