456 lines
14 KiB
JavaScript
456 lines
14 KiB
JavaScript
import { HORIZONTAL_SLIDES_SELECTOR, VERTICAL_SLIDES_SELECTOR } from '../utils/constants.js'
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import { extend, queryAll, closest } from '../utils/util.js'
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import { isMobile } from '../utils/device.js'
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import fitty from 'fitty';
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/**
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* Handles loading, unloading and playback of slide
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* content such as images, videos and iframes.
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*/
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export default class SlideContent {
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constructor( Reveal ) {
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this.Reveal = Reveal;
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this.startEmbeddedIframe = this.startEmbeddedIframe.bind( this );
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}
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/**
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* Should the given element be preloaded?
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* Decides based on local element attributes and global config.
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*
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* @param {HTMLElement} element
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*/
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shouldPreload( element ) {
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// Prefer an explicit global preload setting
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let preload = this.Reveal.getConfig().preloadIframes;
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// If no global setting is available, fall back on the element's
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// own preload setting
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if( typeof preload !== 'boolean' ) {
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preload = element.hasAttribute( 'data-preload' );
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}
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return preload;
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}
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/**
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* Called when the given slide is within the configured view
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* distance. Shows the slide element and loads any content
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* that is set to load lazily (data-src).
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*
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* @param {HTMLElement} slide Slide to show
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*/
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load( slide, options = {} ) {
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// Show the slide element
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slide.style.display = this.Reveal.getConfig().display;
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// Media elements with data-src attributes
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queryAll( slide, 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ).forEach( element => {
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if( element.tagName !== 'IFRAME' || this.shouldPreload( element ) ) {
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element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
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element.setAttribute( 'data-lazy-loaded', '' );
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element.removeAttribute( 'data-src' );
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}
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} );
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// Media elements with <source> children
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queryAll( slide, 'video, audio' ).forEach( media => {
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let sources = 0;
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queryAll( media, 'source[data-src]' ).forEach( source => {
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source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
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source.removeAttribute( 'data-src' );
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source.setAttribute( 'data-lazy-loaded', '' );
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sources += 1;
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} );
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// Enable inline video playback in mobile Safari
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if( isMobile && media.tagName === 'VIDEO' ) {
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media.setAttribute( 'playsinline', '' );
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}
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// If we rewrote sources for this video/audio element, we need
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// to manually tell it to load from its new origin
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if( sources > 0 ) {
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media.load();
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}
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} );
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// Show the corresponding background element
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let background = slide.slideBackgroundElement;
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if( background ) {
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background.style.display = 'block';
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let backgroundContent = slide.slideBackgroundContentElement;
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let backgroundIframe = slide.getAttribute( 'data-background-iframe' );
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// If the background contains media, load it
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if( background.hasAttribute( 'data-loaded' ) === false ) {
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background.setAttribute( 'data-loaded', 'true' );
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let backgroundImage = slide.getAttribute( 'data-background-image' ),
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backgroundVideo = slide.getAttribute( 'data-background-video' ),
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backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
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backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' );
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// Images
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if( backgroundImage ) {
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backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')';
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}
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// Videos
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else if ( backgroundVideo && !this.Reveal.isSpeakerNotes() ) {
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let video = document.createElement( 'video' );
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if( backgroundVideoLoop ) {
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video.setAttribute( 'loop', '' );
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}
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if( backgroundVideoMuted ) {
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video.muted = true;
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}
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// Enable inline playback in mobile Safari
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//
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// Mute is required for video to play when using
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// swipe gestures to navigate since they don't
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// count as direct user actions :'(
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if( isMobile ) {
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video.muted = true;
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video.setAttribute( 'playsinline', '' );
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}
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// Support comma separated lists of video sources
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backgroundVideo.split( ',' ).forEach( source => {
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video.innerHTML += '<source src="'+ source +'">';
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} );
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backgroundContent.appendChild( video );
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}
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// Iframes
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else if( backgroundIframe && options.excludeIframes !== true ) {
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let iframe = document.createElement( 'iframe' );
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iframe.setAttribute( 'allowfullscreen', '' );
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iframe.setAttribute( 'mozallowfullscreen', '' );
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iframe.setAttribute( 'webkitallowfullscreen', '' );
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iframe.setAttribute( 'allow', 'autoplay' );
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iframe.setAttribute( 'data-src', backgroundIframe );
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iframe.style.width = '100%';
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iframe.style.height = '100%';
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iframe.style.maxHeight = '100%';
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iframe.style.maxWidth = '100%';
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backgroundContent.appendChild( iframe );
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}
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}
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// Start loading preloadable iframes
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let backgroundIframeElement = backgroundContent.querySelector( 'iframe[data-src]' );
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if( backgroundIframeElement ) {
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// Check if this iframe is eligible to be preloaded
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if( this.shouldPreload( background ) && !/autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
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if( backgroundIframeElement.getAttribute( 'src' ) !== backgroundIframe ) {
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backgroundIframeElement.setAttribute( 'src', backgroundIframe );
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}
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}
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}
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}
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// Autosize text with the r-fit-text class based on the
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// size of its container. This needs to happen after the
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// slide is visible in order to measure the text.
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Array.from( slide.querySelectorAll( '.r-fit-text:not([data-fitted])' ) ).forEach( element => {
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element.dataset.fitted = '';
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fitty( element, {
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minSize: 24,
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maxSize: this.Reveal.getConfig().height * 0.8,
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observeMutations: false,
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observeWindow: false
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} );
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} );
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}
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/**
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* Unloads and hides the given slide. This is called when the
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* slide is moved outside of the configured view distance.
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*
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* @param {HTMLElement} slide
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*/
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unload( slide ) {
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// Hide the slide element
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slide.style.display = 'none';
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// Hide the corresponding background element
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let background = this.Reveal.getSlideBackground( slide );
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if( background ) {
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background.style.display = 'none';
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// Unload any background iframes
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queryAll( background, 'iframe[src]' ).forEach( element => {
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element.removeAttribute( 'src' );
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} );
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}
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// Reset lazy-loaded media elements with src attributes
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queryAll( slide, 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ).forEach( element => {
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element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
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element.removeAttribute( 'src' );
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} );
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// Reset lazy-loaded media elements with <source> children
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queryAll( slide, 'video[data-lazy-loaded] source[src], audio source[src]' ).forEach( source => {
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source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
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source.removeAttribute( 'src' );
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} );
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}
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/**
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* Enforces origin-specific format rules for embedded media.
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*/
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formatEmbeddedContent() {
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let _appendParamToIframeSource = ( sourceAttribute, sourceURL, param ) => {
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queryAll( this.Reveal.getSlidesElement(), 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ).forEach( el => {
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let src = el.getAttribute( sourceAttribute );
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if( src && src.indexOf( param ) === -1 ) {
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el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
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}
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});
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};
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// YouTube frames must include "?enablejsapi=1"
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_appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
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_appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
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// Vimeo frames must include "?api=1"
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_appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
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_appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
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}
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/**
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* Start playback of any embedded content inside of
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* the given element.
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*
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* @param {HTMLElement} element
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*/
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startEmbeddedContent( element ) {
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if( element && !this.Reveal.isSpeakerNotes() ) {
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// Restart GIFs
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queryAll( element, 'img[src$=".gif"]' ).forEach( el => {
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// Setting the same unchanged source like this was confirmed
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// to work in Chrome, FF & Safari
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el.setAttribute( 'src', el.getAttribute( 'src' ) );
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} );
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// HTML5 media elements
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queryAll( element, 'video, audio' ).forEach( el => {
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if( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {
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return;
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}
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// Prefer an explicit global autoplay setting
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let autoplay = this.Reveal.getConfig().autoPlayMedia;
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// If no global setting is available, fall back on the element's
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// own autoplay setting
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if( typeof autoplay !== 'boolean' ) {
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autoplay = el.hasAttribute( 'data-autoplay' ) || !!closest( el, '.slide-background' );
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}
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if( autoplay && typeof el.play === 'function' ) {
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// If the media is ready, start playback
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if( el.readyState > 1 ) {
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this.startEmbeddedMedia( { target: el } );
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}
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// Mobile devices never fire a loaded event so instead
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// of waiting, we initiate playback
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else if( isMobile ) {
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let promise = el.play();
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// If autoplay does not work, ensure that the controls are visible so
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// that the viewer can start the media on their own
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if( promise && typeof promise.catch === 'function' && el.controls === false ) {
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promise.catch( () => {
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el.controls = true;
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// Once the video does start playing, hide the controls again
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el.addEventListener( 'play', () => {
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el.controls = false;
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} );
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} );
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}
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}
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// If the media isn't loaded, wait before playing
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else {
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el.removeEventListener( 'loadeddata', this.startEmbeddedMedia ); // remove first to avoid dupes
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el.addEventListener( 'loadeddata', this.startEmbeddedMedia );
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}
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}
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} );
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// Normal iframes
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queryAll( element, 'iframe[src]' ).forEach( el => {
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if( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {
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return;
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}
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this.startEmbeddedIframe( { target: el } );
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} );
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// Lazy loading iframes
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queryAll( element, 'iframe[data-src]' ).forEach( el => {
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if( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {
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return;
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}
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if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
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el.removeEventListener( 'load', this.startEmbeddedIframe ); // remove first to avoid dupes
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el.addEventListener( 'load', this.startEmbeddedIframe );
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el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
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}
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} );
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}
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}
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/**
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* Starts playing an embedded video/audio element after
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* it has finished loading.
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*
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* @param {object} event
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*/
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startEmbeddedMedia( event ) {
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let isAttachedToDOM = !!closest( event.target, 'html' ),
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isVisible = !!closest( event.target, '.present' );
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if( isAttachedToDOM && isVisible ) {
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event.target.currentTime = 0;
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event.target.play();
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}
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event.target.removeEventListener( 'loadeddata', this.startEmbeddedMedia );
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}
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/**
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* "Starts" the content of an embedded iframe using the
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* postMessage API.
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*
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* @param {object} event
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*/
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startEmbeddedIframe( event ) {
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let iframe = event.target;
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if( iframe && iframe.contentWindow ) {
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let isAttachedToDOM = !!closest( event.target, 'html' ),
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isVisible = !!closest( event.target, '.present' );
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if( isAttachedToDOM && isVisible ) {
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// Prefer an explicit global autoplay setting
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let autoplay = this.Reveal.getConfig().autoPlayMedia;
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// If no global setting is available, fall back on the element's
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// own autoplay setting
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if( typeof autoplay !== 'boolean' ) {
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autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closest( iframe, '.slide-background' );
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}
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// YouTube postMessage API
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if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
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iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
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}
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// Vimeo postMessage API
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else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
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iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
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}
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// Generic postMessage API
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else {
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iframe.contentWindow.postMessage( 'slide:start', '*' );
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}
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}
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}
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}
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/**
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* Stop playback of any embedded content inside of
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* the targeted slide.
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*
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* @param {HTMLElement} element
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*/
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stopEmbeddedContent( element, options = {} ) {
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options = extend( {
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// Defaults
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unloadIframes: true
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}, options );
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if( element && element.parentNode ) {
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// HTML5 media elements
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queryAll( element, 'video, audio' ).forEach( el => {
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if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
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el.setAttribute('data-paused-by-reveal', '');
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el.pause();
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}
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} );
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// Generic postMessage API for non-lazy loaded iframes
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queryAll( element, 'iframe' ).forEach( el => {
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if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
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el.removeEventListener( 'load', this.startEmbeddedIframe );
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});
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// YouTube postMessage API
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queryAll( element, 'iframe[src*="youtube.com/embed/"]' ).forEach( el => {
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if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
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el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
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}
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});
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// Vimeo postMessage API
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queryAll( element, 'iframe[src*="player.vimeo.com/"]' ).forEach( el => {
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if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
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el.contentWindow.postMessage( '{"method":"pause"}', '*' );
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}
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});
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if( options.unloadIframes === true ) {
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// Unload lazy-loaded iframes
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queryAll( element, 'iframe[data-src]' ).forEach( el => {
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// Only removing the src doesn't actually unload the frame
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// in all browsers (Firefox) so we set it to blank first
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el.setAttribute( 'src', 'about:blank' );
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el.removeAttribute( 'src' );
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} );
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}
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}
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}
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} |