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wait for in-slide video/audio to load before playing, reuse same autoplay logic for slide backgrounds

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This commit is contained in:
Hakim El Hattab 2017-01-16 16:11:20 +01:00
parent 568c7516f7
commit a38207f1d7
1 changed files with 43 additions and 35 deletions
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74
js/reveal.js
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@ -2873,34 +2873,17 @@
} );
// Stop any currently playing video background
// Stop content inside of previous backgrounds
if( previousBackground ) {
var previousVideo = previousBackground.querySelector( 'video' );
if( previousVideo ) previousVideo.pause();
stopEmbeddedContent( previousBackground );
}
// Start content in the current background
if( currentBackground ) {
// Start video playback
var currentVideo = currentBackground.querySelector( 'video' );
if( currentVideo ) {
var startVideo = function() {
currentVideo.currentTime = 0;
currentVideo.play();
currentVideo.removeEventListener( 'loadeddata', startVideo );
};
if( currentVideo.readyState > 1 ) {
startVideo();
}
else {
currentVideo.addEventListener( 'loadeddata', startVideo );
}
}
startEmbeddedContent( currentBackground, true );
var backgroundImageURL = currentBackground.style.backgroundImage || '';
@ -3189,11 +3172,12 @@
* Start playback of any embedded content inside of
* the given element.
*
* @param {HTMLElement} slide
* @param {HTMLElement} element
*/
function startEmbeddedContent( element ) {
if( element && !isSpeakerNotes() ) {
// Restart GIFs
toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
// Setting the same unchanged source like this was confirmed
@ -3207,9 +3191,28 @@
return;
}
if( el.hasAttribute( 'data-autoplay' ) && typeof el.play === 'function' ) {
// Autoplay is always on for slide backgrounds
var autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
if( autoplay && typeof el.play === 'function' ) {
var _startVideo = function() {
// Only start playback if the containing slide is still visible
if( !!closestParent( el, '.present' ) ) {
el.currentTime = 0;
el.play();
}
el.removeEventListener( 'loadeddata', _startVideo );
};
if( el.readyState > 1 ) {
_startVideo();
}
else {
el.addEventListener( 'loadeddata', _startVideo );
}
}
} );
// Normal iframes
@ -3233,6 +3236,7 @@
el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
}
} );
}
}
@ -3249,12 +3253,14 @@
if( iframe && iframe.contentWindow ) {
var autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
// YouTube postMessage API
if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
}
// Vimeo postMessage API
else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
}
// Generic postMessage API
@ -3270,40 +3276,42 @@
* Stop playback of any embedded content inside of
* the targeted slide.
*
* @param {HTMLElement} slide
* @param {HTMLElement} element
* @param {boolean} autoplay Optionally override the
* autoplay setting of media elements
*/
function stopEmbeddedContent( slide ) {
function stopEmbeddedContent( element, autoplay ) {
if( slide && slide.parentNode ) {
if( element && element.parentNode ) {
// HTML5 media elements
toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
el.pause();
}
} );
// Generic postMessage API for non-lazy loaded iframes
toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
el.contentWindow.postMessage( 'slide:stop', '*' );
el.removeEventListener( 'load', startEmbeddedIframe );
});
// YouTube postMessage API
toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
}
});
// Vimeo postMessage API
toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
el.contentWindow.postMessage( '{"method":"pause"}', '*' );
}
});
// Lazy loading iframes
toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
// Only removing the src doesn't actually unload the frame
// in all browsers (Firefox) so we set it to blank first
el.setAttribute( 'src', 'about:blank' );