W3C home > Mailing lists > Public > www-style@w3.org > April 2014

Re: [mediaqueries4]Differentiating touchscreen+mouse from touchscreen only scenarios

From: François REMY <francois.remy.dev@outlook.com>
Date: Mon, 28 Apr 2014 22:03:05 +0200
Message-ID: <DUB130-DS27BAD9A5B5BD32F2B8F521A5470@phx.gbl>
To: "Tab Atkins Jr." <jackalmage@gmail.com>
Cc: "Oren Freiberg" <oren.freiberg@microsoft.com>, "Rick Byers" <rbyers@chromium.org>, "CSS WG" <www-style@w3.org>
>> Wouldn't it be better to have
>>    primary-pointer: (fine || coarse) && (has-hover || has-no-hover)
>>    any-pointer: (fine || coarse || fine && coarse) && (has-hover ||
>> has-no-hover || has-hover && has-no-hover)
>>    - where "primary-pointer" returns the value of the most convenient 
>> input
>> method (and opposite values are therefore mutually exclusive),
>>    - and where "any-poiner" returns the combination of the flags that 
>> match
>> any of the enabled input methods without distinction.
>Note that this doesn't address the issue of "this device has multiple
>primary inputs", which still means that you need to be able to match
>multiple values for the "primary" thing.  Unless you're arguing that
>devices should just make up their mind and settle on a single primary
>input, and leave the detection of secondary inputs to the any-* MQs?

I think it's not unreasonable. That would make the spec text simpler by just 
clarifying that only one input method is considered to be the primary one 
(even if that selected one could technically change while the page is being 
run if the browser really want to).

To clarify, I'm not against multiple primary pointers, but it's difficult to 
spec and it remains hard for authors to guess what to do anyway; the device 
manufacturer and the OS probably knows a lot about the usage habits of the 
device and can provide the simpler piece of advice you need: should I 
optimize my UI for imprecise input methods or not. If the media query 
replies both, that is not really helping, I think.

>I think this is probably a reasonable approach to the problem of
>detecting whether it's even *possible* for a user to do something.
>I'd keep the MQs as written today, and just add another pair called
>"any-pointer" and "any-hover" which address the rest of the inputs.

Yes, that would be ok; "any-hover" looked a bit strange to me, which is why 
I figured out we should maybe merge the two, but it seeems understandable. 
Received on Monday, 28 April 2014 20:03:32 UTC

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