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Add presenting slides actions (#284)
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SHA: 52b1a55
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<link href="https://www.w3.org/2008/site/images/favicon.ico" rel="icon">
<meta content="Bikeshed version 44af0bf3e, updated Fri Jul 29 17:05:16 2022 -0700" name="generator">
<link href="https://www.w3.org/TR/mediasession/" rel="canonical">
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.example .self-link { display: none; }
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is to turn the user’s active camera on or off.
<li> <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSessionAction" data-dfn-type="enum-value" data-export data-lt="&quot;hangup&quot;|hangup" id="dom-mediasessionaction-hangup"><code>hangup</code></dfn>: the action’s intent
is to end a call.
<li> <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSessionAction" data-dfn-type="enum-value" data-export data-lt="&quot;previousslide&quot;|previousslide" id="dom-mediasessionaction-previousslide"><code>previousslide</code></dfn>: the action’s intent
is to go back to the previous slide when presenting slides.
<li> <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSessionAction" data-dfn-type="enum-value" data-export data-lt="&quot;nextslide&quot;|nextslide" id="dom-mediasessionaction-nextslide"><code>nextslide</code></dfn>: the action’s intent
is to go to the next slide when presenting slides.
</ul>
<p></p>
<p> All <code class="idl"><a data-link-type="idl" href="#mediasession" id="ref-for-mediasession④">MediaSession</a></code>s have a map of <dfn class="dfn-paneled" data-dfn-type="dfn" data-lt="supported media session actions" data-noexport id="supported-media-session-actions">supported media session
Expand Down Expand Up @@ -1057,7 +1061,9 @@ <h2 class="heading settled" data-level="6" id="the-mediasession-interface"><span
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-seekto" id="ref-for-dom-mediasessionaction-seekto"><c- s>"seekto"</c-></a>,
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglemicrophone" id="ref-for-dom-mediasessionaction-togglemicrophone①"><c- s>"togglemicrophone"</c-></a>,
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglecamera" id="ref-for-dom-mediasessionaction-togglecamera①"><c- s>"togglecamera"</c-></a>,
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-hangup" id="ref-for-dom-mediasessionaction-hangup①"><c- s>"hangup"</c-></a>
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-hangup" id="ref-for-dom-mediasessionaction-hangup①"><c- s>"hangup"</c-></a>,
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-previousslide" id="ref-for-dom-mediasessionaction-previousslide"><c- s>"previousslide"</c-></a>,
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-nextslide" id="ref-for-dom-mediasessionaction-nextslide"><c- s>"nextslide"</c-></a>
};

<c- b>callback</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="callback" data-export id="callbackdef-mediasessionactionhandler"><code><c- g>MediaSessionActionHandler</c-></code></dfn> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined"><c- b>undefined</c-></a>(<a data-link-type="idl-name" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails①"><c- n>MediaSessionActionDetails</c-></a> <dfn class="idl-code" data-dfn-for="MediaSessionActionHandler" data-dfn-type="argument" data-export id="dom-mediasessionactionhandler-details"><code><c- g>details</c-></code><a class="self-link" href="#dom-mediasessionactionhandler-details"></a></dfn>);
Expand Down Expand Up @@ -1138,10 +1144,10 @@ <h2 class="heading settled" data-level="6" id="the-mediasession-interface"><span
the user agent whether the microphone and camera are currently considered by
the page to be active (e.g. if the microphone is considered "muted" by the
page since it is no longer sending audio through to a call, then the page can
invoke <code>setMicrophoneActive(false)</code>). The user agent MAY display UI
which invoke the handlers for the <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglemicrophone" id="ref-for-dom-mediasessionaction-togglemicrophone②">togglemicrophone</a> and <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglecamera" id="ref-for-dom-mediasessionaction-togglecamera②">togglecamera</a> <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action①⓪">media session actions</a>, and
it is RECOMMENDED that the user agent respect the microphone and camera
invoke <code>setMicrophoneActive(false)</code>).
It is RECOMMENDED that the user agent respect the microphone and camera
states indicated by the page in this UI. </p>
<p> The user agent MAY display UI which invokes handlers for <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action①⓪">media session actions</a>. </p>
<h2 class="heading settled" data-level="7" id="the-mediametadata-interface"><span class="secno">7. </span><span class="content">The <code class="idl"><a data-link-type="idl" href="#mediametadata" id="ref-for-mediametadata⑧">MediaMetadata</a></code> interface</span><a class="self-link" href="#the-mediametadata-interface"></a></h2>
<pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed②"><c- g>Exposed</c-></a>=<c- n>Window</c->]
<c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="mediametadata"><code><c- g>MediaMetadata</c-></code></dfn> {
Expand Down Expand Up @@ -1531,6 +1537,21 @@ <h2 class="heading settled" data-level="11" id="examples"><span class="secno">11
navigator<c- p>.</c->mediaSession<c- p>.</c->setActionHandler<c- p>(</c-><c- u>"hangup"</c-><c- p>,</c-> <c- a>function</c-><c- p>()</c-> <c- p>{</c->
<c- c1>// End the call. Implementation omitted.</c->
<c- p>});</c->
</pre>
</div>
<div class="example" id="example-presenting-slide-actions">
<a class="self-link" href="#example-presenting-slide-actions"></a> Handling presenting slide actions:
<pre class="lang-javascript highlight"><c- a>var</c-> currentSlideIndex <c- o>=</c-> <c- mf>0</c-><c- p>;</c->

navigator<c- p>.</c->mediaSession<c- p>.</c->setActionHandler<c- p>(</c-><c- u>"previousslide"</c-><c- p>,</c-> <c- a>function</c-><c- p>()</c-> <c- p>{</c->
currentSlideIndex<c- o>--</c-><c- p>;</c->
<c- c1>// Set current slide. Implementation omitted.</c->
<c- p>});</c->

navigator<c- p>.</c->mediaSession<c- p>.</c->setActionHandler<c- p>(</c-><c- u>"nextslide"</c-><c- p>,</c-> <c- a>function</c-><c- p>()</c-> <c- p>{</c->
currentSlideIndex<c- o>++</c-><c- p>;</c->
<c- c1>// Set current slide. Implementation omitted.</c->
<c- p>});</c->
</pre>
</div>
<h2 class="no-num heading settled" id="acknowledgments"><span class="content">Acknowledgments</span><a class="self-link" href="#acknowledgments"></a></h2>
Expand Down Expand Up @@ -1659,6 +1680,8 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
<li><a href="#dom-mediasession-metadata">attribute for MediaSession</a><span>, in § 6</span>
<li><a href="#mediasession-metadata">dfn for MediaSession</a><span>, in § 6</span>
</ul>
<li><a href="#dom-mediasessionaction-nextslide">"nextslide"</a><span>, in § 5.4</span>
<li><a href="#dom-mediasessionaction-nextslide">nextslide</a><span>, in § 5.4</span>
<li><a href="#dom-mediasessionaction-nexttrack">"nexttrack"</a><span>, in § 5.4</span>
<li><a href="#dom-mediasessionaction-nexttrack">nexttrack</a><span>, in § 5.4</span>
<li><a href="#dom-mediasessionplaybackstate-none">"none"</a><span>, in § 6</span>
Expand All @@ -1677,6 +1700,8 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
<li><a href="#dom-mediapositionstate-position">position</a><span>, in § 9</span>
<li><a href="#position-state①">position state</a><span>, in § 5.5</span>
<li><a href="#preferred-artwork-image">preferred artwork image</a><span>, in § 5.3</span>
<li><a href="#dom-mediasessionaction-previousslide">"previousslide"</a><span>, in § 5.4</span>
<li><a href="#dom-mediasessionaction-previousslide">previousslide</a><span>, in § 5.4</span>
<li><a href="#dom-mediasessionaction-previoustrack">"previoustrack"</a><span>, in § 5.4</span>
<li><a href="#dom-mediasessionaction-previoustrack">previoustrack</a><span>, in § 5.4</span>
<li><a href="#dom-mediasessionaction-seekbackward">"seekbackward"</a><span>, in § 5.4</span>
Expand Down Expand Up @@ -2057,7 +2082,9 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-seekto"><c- s>"seekto"</c-></a>,
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglemicrophone"><c- s>"togglemicrophone"</c-></a>,
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-togglecamera"><c- s>"togglecamera"</c-></a>,
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-hangup"><c- s>"hangup"</c-></a>
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-hangup"><c- s>"hangup"</c-></a>,
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-previousslide"><c- s>"previousslide"</c-></a>,
<a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-nextslide"><c- s>"nextslide"</c-></a>
};

<c- b>callback</c-> <a href="#callbackdef-mediasessionactionhandler"><code><c- g>MediaSessionActionHandler</c-></code></a> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a>(<a data-link-type="idl-name" href="#dictdef-mediasessionactiondetails"><c- n>MediaSessionActionDetails</c-></a> <a href="#dom-mediasessionactionhandler-details"><code><c- g>details</c-></code></a>);
Expand Down Expand Up @@ -2249,14 +2276,14 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
<b><a href="#dom-mediasessionaction-togglemicrophone">#dom-mediasessionaction-togglemicrophone</a></b><b>Referenced in:</b>
<ul>
<li><a href="#ref-for-dom-mediasessionaction-togglemicrophone">5.4. Actions</a>
<li><a href="#ref-for-dom-mediasessionaction-togglemicrophone①">6. The MediaSession interface</a> <a href="#ref-for-dom-mediasessionaction-togglemicrophone②">(2)</a>
<li><a href="#ref-for-dom-mediasessionaction-togglemicrophone①">6. The MediaSession interface</a>
</ul>
</aside>
<aside class="dfn-panel" data-for="dom-mediasessionaction-togglecamera">
<b><a href="#dom-mediasessionaction-togglecamera">#dom-mediasessionaction-togglecamera</a></b><b>Referenced in:</b>
<ul>
<li><a href="#ref-for-dom-mediasessionaction-togglecamera">5.4. Actions</a>
<li><a href="#ref-for-dom-mediasessionaction-togglecamera①">6. The MediaSession interface</a> <a href="#ref-for-dom-mediasessionaction-togglecamera②">(2)</a>
<li><a href="#ref-for-dom-mediasessionaction-togglecamera①">6. The MediaSession interface</a>
</ul>
</aside>
<aside class="dfn-panel" data-for="dom-mediasessionaction-hangup">
Expand All @@ -2266,6 +2293,18 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
<li><a href="#ref-for-dom-mediasessionaction-hangup①">6. The MediaSession interface</a>
</ul>
</aside>
<aside class="dfn-panel" data-for="dom-mediasessionaction-previousslide">
<b><a href="#dom-mediasessionaction-previousslide">#dom-mediasessionaction-previousslide</a></b><b>Referenced in:</b>
<ul>
<li><a href="#ref-for-dom-mediasessionaction-previousslide">6. The MediaSession interface</a>
</ul>
</aside>
<aside class="dfn-panel" data-for="dom-mediasessionaction-nextslide">
<b><a href="#dom-mediasessionaction-nextslide">#dom-mediasessionaction-nextslide</a></b><b>Referenced in:</b>
<ul>
<li><a href="#ref-for-dom-mediasessionaction-nextslide">6. The MediaSession interface</a>
</ul>
</aside>
<aside class="dfn-panel" data-for="supported-media-session-actions">
<b><a href="#supported-media-session-actions">#supported-media-session-actions</a></b><b>Referenced in:</b>
<ul>
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