[webkit-dev] Adding ENABLE_BATTERY_STATUS to WebCore

[Greg Simon]

>From what I can tell the spec offers no way for the web application to
initialize any algorithm based on the battery/power state because there is
no guarantee of "minimum time" when a new document is created and the first
battery event arrives. Ideally there would be a way to "kick" the UA into
sending the battery event on demand.

Otherwise the web application starts at full-throttle (burning battery) on a
device with 10% battery left until it *drains* enough to get a batteryEvent.




On Wed, Jun 15, 2011 at 10:08 AM, Alexis Menard <alexis.menard at openbossa.org
> wrote:

> On Wed, Jun 15, 2011 at 2:02 PM, Andrei Popescu <andreip at google.com>
> wrote:
> > On Wed, Jun 15, 2011 at 5:58 PM, Brett Wilson <brettw at chromium.org>
> wrote:
> >> On Wed, Jun 15, 2011 at 9:30 AM, Holger Freyther <zecke at selfish.org>
> wrote:
> >>> On 06/15/2011 06:11 PM, laszlo.1.gombos at nokia.com wrote:
> >>>> Hi,
> >>>>
> >>>
> >>>>
> >>>> The use-case for us is to enable content developers to implement
> rudimentary power management (e.g. to stop "expensive" operations on the
> page, perhaps save state). I'm not sure if this API is really meant for
> accurately reporting all the possible power management states of the system
> as Anssi pointed out.
> >>>
> >>> Okay, point on complexity taken. My question is what if you want to add
> >>> complexity, is there something in the event that prevents that (I have
> no idea
> >>> about DOM compatibility issues)? Don't get me wrong I think having more
> device
> >>> support is great.
> >>>
> >>> My other complain was, it is too simple. E.g. 'isPlugged' has no
> guarantee
> >>> that the battery is getting charged. Is this a problem?
> >>
> >> Why would a web page care about whether the battery is being charged
> >> when the device is plugged in?
> >>
> >
> > Because it would know not to start doing things that drain the
> > battery. For instance, powering up a 3G antenna to download your
> > latest emails could be annoying to users if the battery level is too
> > low. 3G takes quite a bit of power and the device would be in danger
> > of powering down.
>
> But if the phone is plugged in it can't power down. Most of modern
> phones don't switch off anymore even if you have the battery low and
> you play games, surf WiFi, go 3G as soon as you plugged it in. What
> Brett meant is that it's useless to know that the battery is charging
> while the phone is plugged in, you just want to know that it will not
> switch off in any case so you can do whatever you want.
>
> >
> > Thanks,
> > Andrei
> > _______________________________________________
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> > webkit-dev at lists.webkit.org
> > http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
> >
>
>
>
> --
> Alexis Menard
> Software Engineer
> INdT Recife Brazil
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>
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