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Standardize window.orientation API #271

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Standardize window.orientation API #271

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Expand Up @@ -312,6 +312,55 @@ <h2>
</table>
</section>
</section>
<section data-dfn-for="Window">
<h2>
Extensions to the `Window` interface
</h2>
<pre class="idl">
partial interface Window {
readonly attribute short orientation;
attribute EventHandler onorientationchange;
};
</pre>
<section>
<h2>
`orientation` attribute
</h2>
<p>
When getting the {{Window/orientation}} attribute, the [=user agent=] MUST run
the following steps:
</p>
<ol class="algorithm">
<li>Let |orientationAngle| be the [=Screen/current orientation angle=].
</li>
<li>If |orientationAngle| is less than 180, return |orientationAngle|.
</li>
<li>If |orientationAngle| is 180, and the [=user agent=] supports that value,
return |orientationAngle|, else return 0.
</li>
<li>If |orientationAngle| is greater than 180, return |orientationAngle| - 360.
</li>
</ol>
<p>
User agents MUST support the `-90`, `0` and `90` values and MAY optionally support `180`.
</p>
<p class="note">
`0` represents the natural orientation, `-90` represents 90 degrees clockwise,
`90` represents 90 degrees counterclockwise, and `180` represents 180 degrees
from natural orientation.
</p>
</section>
<section>
<h2>
`onorientationchange` event handler attribute
</h2>
<p>
The {{Window/onorientationchange}} attribute is an [=event handler IDL attribute=] for
the {{Window/onorientationchange}} [=event handler=], whose [=event handler event type=]
is <dfn class="event" data-dfn-for="Window">orientationchange</dfn>.
</p>
</section>
</section>
<section data-dfn-for="Screen">
<h2>
Extensions to the `Screen` interface
Expand Down Expand Up @@ -801,6 +850,9 @@ <h2>
<li>[=Fire an event=] named "<a data-link-for=
"ScreenOrientation">change</a>" at |screenOrientation|.
</li>
<li>[=Fire an event=] named "<a data-link-for=
"Window">orientationchange</a>" at |document|'s [=relevant global object=].
</li>
</ol>
</li>
<li>Let |descendantDocs| be an [=ordered set=] consisting of
Expand Down