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Re: [sensors] Device Proximity (was: Device light and proximity sensor)

From: Marcos Caceres <w3c@marcosc.com>
Date: Wed, 9 May 2012 23:29:31 +0100
To: Doug Turner <dougt@mozilla.com>
Cc: Robin Berjon <robin@berjon.com>, "public-device-apis@w3.org public-device-apis@w3.org" <public-device-apis@w3.org>
Message-ID: <61228F8447774BDFBF34FF3F12E98546@marcosc.com>

On Wednesday, May 9, 2012 at 11:22 PM, Doug Turner wrote:

> On May 9, 2012, at 3:19 PM, Robin Berjon wrote:
> > On May 9, 2012, at 14:16 , Marcos Caceres wrote:
> > > On Wednesday, May 9, 2012 at 10:13 PM, Tran, Dzung D wrote:
> > > > > So, what I agreed with jonas about was a new event that only fired when there was a transition between near and far. device proximity for something that was more advanced. <insert this new event name here> for something really simple.  
> > > >  
> > > >  
> > > >  
> > > > What I am afraid of is that browsers going to interpret far versus near differently on the same device. I rather to give the control to the programmer to interpret base on value, min, max.
> > >  
> > > I'm afraid of the opposite thing. I more trust the people that are closer to the os (or directly interfacing with the hardware) to handle that.  
> >  
> > The OS knows the sensor's calibration best — it ought to be able to give you near/far events directly. That's how things work on iOS where you get a proximityState boolean when something is close to the device. Android does it more like Doug's proposal.
> >  
> > If the use case is just detecting proximity then I prefer the iOS approach — the OS will know better, and the developer doesn't need to know more. If we're trying to do a generic distance sensor then we're missing at least a field to indicate multiple sensors triggering (which is not common on phones, but I believe is the norm on cars — yes, we have to get used to thinking about those too I'm afraid :).
> >  
> > I'm not convinced that we should try to merge the two use cases into a single approach.
> So lets just create a new dom event as I suggested. Near and far are defined by the UA. Thoughts?  

I would be in support of that.  

I just thought that you might also need a way of checking if the phone is not already "in proximity" to something (e.g., through an attribute on the navigator object or something).  

if(!navigator.<name for in proximity>){
    //set the event listeners

Marcos Caceres
Received on Wednesday, 9 May 2012 22:30:04 UTC

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