- From: Mercurial notifier <cvsmail@w3.org>
- Date: Tue, 18 Sep 2012 19:57:22 +0000
- To: public-dap-commits@w3.org
changeset: 223:4ca38a394d1d
tag: tip
user: Doug Turner <dougt@dougt.org>
date: Tue Sep 18 12:56:23 2012 -0700
files: light/Overview.html
description:
LightLevelEvent draft
diff -r e3c4d9a01f00 -r 4ca38a394d1d light/Overview.html
--- a/light/Overview.html Tue Sep 18 10:26:35 2012 +0200
+++ b/light/Overview.html Tue Sep 18 12:56:23 2012 -0700
@@ -47,9 +47,28 @@
<h2>Introduction</h2>
<p>
The <a>DeviceLightEvent</a> interface provides web developers
- information about the ambient light levels near the hosting.
+ information about the ambient light levels near the
+ hosting in terms of lux units.
</p>
<p>
+ The <a>LightLevelEvent</a> interface provides web
+ developers information about the ambient light
+ levels near the hosting in terms of general ranges.
+ </p>
+ <p>
+ The values of the <a>LightLevelEvent</a> event may
+ be "normal", "dim", or "bright". "bright" is
+ supposed to mean "direct sunlight, or similarly
+ bright conditions that make it hard to see things
+ that aren't high-contrast". "dim" is supposed to
+ mean "dark enough that the light produced by a white
+ background is eye-straining or distracting". The
+ lux values for "dim" typical begin below 50, and the
+ values for "bright" begin above 10000.
+ </p>
+
+
+ <p>
This is achieved by interrogating a photosensors or similar detectors
of a device.
</p>
@@ -99,7 +118,7 @@
</section>
<section>
- <h2>Device light</h2>
+ <h2>Device Light</h2>
<p>
The HTML5 specification [[!HTML5]] defines a <a>Window</a> interface,
which this specification extends:
@@ -190,6 +209,101 @@
</section>
</section>
</section>
+
+ <section>
+ <h2>Light Level</h2>
+ <p>
+ The HTML5 specification [[!HTML5]] defines a <a>Window</a> interface,
+ which this specification extends:
+ </p>
+ <dl title="partial interface Window" class="idl">
+ <dt>attribute EventHandler onlightlevel</dt>
+ <dd>
+ </dd>
+ </dl>
+ <p>
+ The <code>onlightlevel</code> event handler and its corresponding
+ event handler event type <code>lightlevel</code> MUST be supported
+ as an IDL attribute by all objects implementing the <a>Window</a>
+ interface.
+ </p>
+ <section>
+ <h2><a>LightLevelEvent</a> Interface</h2>
+ <dl title="[Constructor (DOMString type, optional LightLevelEventInit eventInitDict)]
+ interface LightLevelEvent : Event"
+ class="idl" data-merge='LightLevelEventInit'>
+ <dt>readonly attribute string value</dt>
+ <dd>
+ The <a>light level</a> may be one of the following
+ strings: "normal", "dim", or "bright". The
+ corresponding lux values are left up to the UA.
+ </dd>
+ </dl>
+ <dl title="dictionary LightLevelEventInit : EventInit" class='idl'>
+ <dt>
+ string value
+ </dt>
+ <dd></dd>
+ </dl>
+ <p>
+ When a <dfn>user agent</dfn> is required to <dfn>fire a light
+ level event</dfn>, the <dfn>user agent</dfn> MUST run the
+ following steps:
+ </p>
+ <ol class="rule">
+ <li>
+ <a>Create an event</a> that uses the <a>LightLevelEvent</a>
+ interface, with the name <code>lightlevel</code>, which
+ bubbles, is not cancelable, and has no default action, that also
+ meets the following conditions:
+ <ol>
+ <li>
+ If the implementation is unable to report the <a>current
+ light level</a>, initialize the <code>value</code>
+ attribute to empty string, otherwise initialize the
+ attribute to the <a>current light level</a>.
+ </li>
+ </ol>
+ </li>
+ <li>
+ <a>Queue a task</a> to dispatch the newly created event at the
+ <a>Window</a> object.
+ </li>
+ </ol>
+ <p>
+ When <a>the current light</a> changes, the <a>user
+ agent</a> MUST <a>fire a light level event</a>.
+ </p>
+ <div class="note">
+ The definition of granularity i.e. how often the event is fired is
+ left to the implementation. Implementations may fire the event if
+ they have reason to believe that the page does not have sufficiently
+ fresh data.
+ </div>
+ <section>
+ <h2>Event handlers</h2>
+ <p>
+ The following are the <a>event handlers</a> (and their corresponding
+ <a>event handler event types</a>) that MUST be supported as
+ attributes by the <code>Window</code> object:
+ </p>
+ <table class="simple">
+ <thead>
+ <tr>
+ <th>event handler</th>
+ <th>event handler event type</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td><strong><code>onlightlevel</code></strong></td>
+ <td><code>lightlevel</code></td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ </section>
+ </section>
<section class="appendix">
<h2>Acknowledgements</h2>
Received on Tuesday, 18 September 2012 19:57:24 UTC