reveal.js 138 KB

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  1. /*!
  2. * reveal.js
  3. * http://lab.hakim.se/reveal-js
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2017 Hakim El Hattab, http://hakim.se
  7. */
  8. (function( root, factory ) {
  9. if( typeof define === 'function' && define.amd ) {
  10. // AMD. Register as an anonymous module.
  11. define( function() {
  12. root.Reveal = factory();
  13. return root.Reveal;
  14. } );
  15. } else if( typeof exports === 'object' ) {
  16. // Node. Does not work with strict CommonJS.
  17. module.exports = factory();
  18. } else {
  19. // Browser globals.
  20. root.Reveal = factory();
  21. }
  22. }( this, function() {
  23. 'use strict';
  24. var Reveal;
  25. // The reveal.js version
  26. var VERSION = '3.4.1';
  27. var SLIDES_SELECTOR = '.slides section',
  28. HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
  29. VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
  30. HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
  31. UA = navigator.userAgent,
  32. // Configuration defaults, can be overridden at initialization time
  33. config = {
  34. // The "normal" size of the presentation, aspect ratio will be preserved
  35. // when the presentation is scaled to fit different resolutions
  36. width: 960,
  37. height: 700,
  38. // Factor of the display size that should remain empty around the content
  39. margin: 0.04,
  40. // Bounds for smallest/largest possible scale to apply to content
  41. minScale: 0.2,
  42. maxScale: 2.0,
  43. // Display controls in the bottom right corner
  44. controls: true,
  45. // Display a presentation progress bar
  46. progress: true,
  47. // Display the page number of the current slide
  48. slideNumber: false,
  49. // Determine which displays to show the slide number on
  50. showSlideNumber: 'all',
  51. // Push each slide change to the browser history
  52. history: false,
  53. // Enable keyboard shortcuts for navigation
  54. keyboard: true,
  55. // Optional function that blocks keyboard events when retuning false
  56. keyboardCondition: null,
  57. // Enable the slide overview mode
  58. overview: true,
  59. // Vertical centering of slides
  60. center: true,
  61. // Enables touch navigation on devices with touch input
  62. touch: true,
  63. // Loop the presentation
  64. loop: false,
  65. // Change the presentation direction to be RTL
  66. rtl: false,
  67. // Randomizes the order of slides each time the presentation loads
  68. shuffle: false,
  69. // Turns fragments on and off globally
  70. fragments: true,
  71. // Flags if the presentation is running in an embedded mode,
  72. // i.e. contained within a limited portion of the screen
  73. embedded: false,
  74. // Flags if we should show a help overlay when the question-mark
  75. // key is pressed
  76. help: true,
  77. // Flags if it should be possible to pause the presentation (blackout)
  78. pause: true,
  79. // Flags if speaker notes should be visible to all viewers
  80. showNotes: false,
  81. // Global override for autolaying embedded media (video/audio/iframe)
  82. // - null: Media will only autoplay if data-autoplay is present
  83. // - true: All media will autoplay, regardless of individual setting
  84. // - false: No media will autoplay, regardless of individual setting
  85. autoPlayMedia: null,
  86. // Number of milliseconds between automatically proceeding to the
  87. // next slide, disabled when set to 0, this value can be overwritten
  88. // by using a data-autoslide attribute on your slides
  89. autoSlide: 0,
  90. // Stop auto-sliding after user input
  91. autoSlideStoppable: true,
  92. // Use this method for navigation when auto-sliding (defaults to navigateNext)
  93. autoSlideMethod: null,
  94. // Enable slide navigation via mouse wheel
  95. mouseWheel: false,
  96. // Apply a 3D roll to links on hover
  97. rollingLinks: false,
  98. // Hides the address bar on mobile devices
  99. hideAddressBar: true,
  100. // Opens links in an iframe preview overlay
  101. previewLinks: false,
  102. // Exposes the reveal.js API through window.postMessage
  103. postMessage: true,
  104. // Dispatches all reveal.js events to the parent window through postMessage
  105. postMessageEvents: false,
  106. // Focuses body when page changes visibility to ensure keyboard shortcuts work
  107. focusBodyOnPageVisibilityChange: true,
  108. // Transition style
  109. transition: 'slide', // none/fade/slide/convex/concave/zoom
  110. // Transition speed
  111. transitionSpeed: 'default', // default/fast/slow
  112. // Transition style for full page slide backgrounds
  113. backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
  114. // Parallax background image
  115. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  116. // Parallax background size
  117. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  118. // Amount of pixels to move the parallax background per slide step
  119. parallaxBackgroundHorizontal: null,
  120. parallaxBackgroundVertical: null,
  121. // The maximum number of pages a single slide can expand onto when printing
  122. // to PDF, unlimited by default
  123. pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,
  124. // Number of slides away from the current that are visible
  125. viewDistance: 3,
  126. // The display mode that will be used to show slides
  127. display: 'block',
  128. // Script dependencies to load
  129. dependencies: []
  130. },
  131. // Flags if Reveal.initialize() has been called
  132. initialized = false,
  133. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  134. loaded = false,
  135. // Flags if the overview mode is currently active
  136. overview = false,
  137. // Holds the dimensions of our overview slides, including margins
  138. overviewSlideWidth = null,
  139. overviewSlideHeight = null,
  140. // The horizontal and vertical index of the currently active slide
  141. indexh,
  142. indexv,
  143. // The previous and current slide HTML elements
  144. previousSlide,
  145. currentSlide,
  146. previousBackground,
  147. // Slides may hold a data-state attribute which we pick up and apply
  148. // as a class to the body. This list contains the combined state of
  149. // all current slides.
  150. state = [],
  151. // The current scale of the presentation (see width/height config)
  152. scale = 1,
  153. // CSS transform that is currently applied to the slides container,
  154. // split into two groups
  155. slidesTransform = { layout: '', overview: '' },
  156. // Cached references to DOM elements
  157. dom = {},
  158. // Features supported by the browser, see #checkCapabilities()
  159. features = {},
  160. // Client is a mobile device, see #checkCapabilities()
  161. isMobileDevice,
  162. // Client is a desktop Chrome, see #checkCapabilities()
  163. isChrome,
  164. // Throttles mouse wheel navigation
  165. lastMouseWheelStep = 0,
  166. // Delays updates to the URL due to a Chrome thumbnailer bug
  167. writeURLTimeout = 0,
  168. // Flags if the interaction event listeners are bound
  169. eventsAreBound = false,
  170. // The current auto-slide duration
  171. autoSlide = 0,
  172. // Auto slide properties
  173. autoSlidePlayer,
  174. autoSlideTimeout = 0,
  175. autoSlideStartTime = -1,
  176. autoSlidePaused = false,
  177. // Holds information about the currently ongoing touch input
  178. touch = {
  179. startX: 0,
  180. startY: 0,
  181. startSpan: 0,
  182. startCount: 0,
  183. captured: false,
  184. threshold: 40
  185. },
  186. // Holds information about the keyboard shortcuts
  187. keyboardShortcuts = {
  188. 'N , SPACE': 'Next slide',
  189. 'P': 'Previous slide',
  190. '← , H': 'Navigate left',
  191. '→ , L': 'Navigate right',
  192. '↑ , K': 'Navigate up',
  193. '↓ , J': 'Navigate down',
  194. 'Home': 'First slide',
  195. 'End': 'Last slide',
  196. 'B , .': 'Pause',
  197. 'F': 'Fullscreen',
  198. 'ESC, O': 'Slide overview'
  199. };
  200. /**
  201. * Starts up the presentation if the client is capable.
  202. */
  203. function initialize( options ) {
  204. // Make sure we only initialize once
  205. if( initialized === true ) return;
  206. initialized = true;
  207. checkCapabilities();
  208. if( !features.transforms2d && !features.transforms3d ) {
  209. document.body.setAttribute( 'class', 'no-transforms' );
  210. // Since JS won't be running any further, we load all lazy
  211. // loading elements upfront
  212. var images = toArray( document.getElementsByTagName( 'img' ) ),
  213. iframes = toArray( document.getElementsByTagName( 'iframe' ) );
  214. var lazyLoadable = images.concat( iframes );
  215. for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
  216. var element = lazyLoadable[i];
  217. if( element.getAttribute( 'data-src' ) ) {
  218. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  219. element.removeAttribute( 'data-src' );
  220. }
  221. }
  222. // If the browser doesn't support core features we won't be
  223. // using JavaScript to control the presentation
  224. return;
  225. }
  226. // Cache references to key DOM elements
  227. dom.wrapper = document.querySelector( '.reveal' );
  228. dom.slides = document.querySelector( '.reveal .slides' );
  229. // Force a layout when the whole page, incl fonts, has loaded
  230. window.addEventListener( 'load', layout, false );
  231. var query = Reveal.getQueryHash();
  232. // Do not accept new dependencies via query config to avoid
  233. // the potential of malicious script injection
  234. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  235. // Copy options over to our config object
  236. extend( config, options );
  237. extend( config, query );
  238. // Hide the address bar in mobile browsers
  239. hideAddressBar();
  240. // Loads the dependencies and continues to #start() once done
  241. load();
  242. }
  243. /**
  244. * Inspect the client to see what it's capable of, this
  245. * should only happens once per runtime.
  246. */
  247. function checkCapabilities() {
  248. isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA );
  249. isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
  250. var testElement = document.createElement( 'div' );
  251. features.transforms3d = 'WebkitPerspective' in testElement.style ||
  252. 'MozPerspective' in testElement.style ||
  253. 'msPerspective' in testElement.style ||
  254. 'OPerspective' in testElement.style ||
  255. 'perspective' in testElement.style;
  256. features.transforms2d = 'WebkitTransform' in testElement.style ||
  257. 'MozTransform' in testElement.style ||
  258. 'msTransform' in testElement.style ||
  259. 'OTransform' in testElement.style ||
  260. 'transform' in testElement.style;
  261. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  262. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  263. features.canvas = !!document.createElement( 'canvas' ).getContext;
  264. // Transitions in the overview are disabled in desktop and
  265. // Safari due to lag
  266. features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );
  267. // Flags if we should use zoom instead of transform to scale
  268. // up slides. Zoom produces crisper results but has a lot of
  269. // xbrowser quirks so we only use it in whitelsited browsers.
  270. features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
  271. ( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
  272. }
  273. /**
  274. * Loads the dependencies of reveal.js. Dependencies are
  275. * defined via the configuration option 'dependencies'
  276. * and will be loaded prior to starting/binding reveal.js.
  277. * Some dependencies may have an 'async' flag, if so they
  278. * will load after reveal.js has been started up.
  279. */
  280. function load() {
  281. var scripts = [],
  282. scriptsAsync = [],
  283. scriptsToPreload = 0;
  284. // Called once synchronous scripts finish loading
  285. function proceed() {
  286. if( scriptsAsync.length ) {
  287. // Load asynchronous scripts
  288. head.js.apply( null, scriptsAsync );
  289. }
  290. start();
  291. }
  292. function loadScript( s ) {
  293. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
  294. // Extension may contain callback functions
  295. if( typeof s.callback === 'function' ) {
  296. s.callback.apply( this );
  297. }
  298. if( --scriptsToPreload === 0 ) {
  299. proceed();
  300. }
  301. });
  302. }
  303. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  304. var s = config.dependencies[i];
  305. // Load if there's no condition or the condition is truthy
  306. if( !s.condition || s.condition() ) {
  307. if( s.async ) {
  308. scriptsAsync.push( s.src );
  309. }
  310. else {
  311. scripts.push( s.src );
  312. }
  313. loadScript( s );
  314. }
  315. }
  316. if( scripts.length ) {
  317. scriptsToPreload = scripts.length;
  318. // Load synchronous scripts
  319. head.js.apply( null, scripts );
  320. }
  321. else {
  322. proceed();
  323. }
  324. }
  325. /**
  326. * Starts up reveal.js by binding input events and navigating
  327. * to the current URL deeplink if there is one.
  328. */
  329. function start() {
  330. // Make sure we've got all the DOM elements we need
  331. setupDOM();
  332. // Listen to messages posted to this window
  333. setupPostMessage();
  334. // Prevent the slides from being scrolled out of view
  335. setupScrollPrevention();
  336. // Resets all vertical slides so that only the first is visible
  337. resetVerticalSlides();
  338. // Updates the presentation to match the current configuration values
  339. configure();
  340. // Read the initial hash
  341. readURL();
  342. // Update all backgrounds
  343. updateBackground( true );
  344. // Notify listeners that the presentation is ready but use a 1ms
  345. // timeout to ensure it's not fired synchronously after #initialize()
  346. setTimeout( function() {
  347. // Enable transitions now that we're loaded
  348. dom.slides.classList.remove( 'no-transition' );
  349. loaded = true;
  350. dom.wrapper.classList.add( 'ready' );
  351. dispatchEvent( 'ready', {
  352. 'indexh': indexh,
  353. 'indexv': indexv,
  354. 'currentSlide': currentSlide
  355. } );
  356. }, 1 );
  357. // Special setup and config is required when printing to PDF
  358. if( isPrintingPDF() ) {
  359. removeEventListeners();
  360. // The document needs to have loaded for the PDF layout
  361. // measurements to be accurate
  362. if( document.readyState === 'complete' ) {
  363. setupPDF();
  364. }
  365. else {
  366. window.addEventListener( 'load', setupPDF );
  367. }
  368. }
  369. }
  370. /**
  371. * Finds and stores references to DOM elements which are
  372. * required by the presentation. If a required element is
  373. * not found, it is created.
  374. */
  375. function setupDOM() {
  376. // Prevent transitions while we're loading
  377. dom.slides.classList.add( 'no-transition' );
  378. // Background element
  379. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  380. // Progress bar
  381. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  382. dom.progressbar = dom.progress.querySelector( 'span' );
  383. // Arrow controls
  384. createSingletonNode( dom.wrapper, 'aside', 'controls',
  385. '<button class="navigate-left" aria-label="previous slide"></button>' +
  386. '<button class="navigate-right" aria-label="next slide"></button>' +
  387. '<button class="navigate-up" aria-label="above slide"></button>' +
  388. '<button class="navigate-down" aria-label="below slide"></button>' );
  389. // Slide number
  390. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  391. // Element containing notes that are visible to the audience
  392. dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
  393. dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
  394. dom.speakerNotes.setAttribute( 'tabindex', '0' );
  395. // Overlay graphic which is displayed during the paused mode
  396. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  397. // Cache references to elements
  398. dom.controls = document.querySelector( '.reveal .controls' );
  399. dom.wrapper.setAttribute( 'role', 'application' );
  400. // There can be multiple instances of controls throughout the page
  401. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  402. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  403. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  404. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  405. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  406. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  407. dom.statusDiv = createStatusDiv();
  408. }
  409. /**
  410. * Creates a hidden div with role aria-live to announce the
  411. * current slide content. Hide the div off-screen to make it
  412. * available only to Assistive Technologies.
  413. *
  414. * @return {HTMLElement}
  415. */
  416. function createStatusDiv() {
  417. var statusDiv = document.getElementById( 'aria-status-div' );
  418. if( !statusDiv ) {
  419. statusDiv = document.createElement( 'div' );
  420. statusDiv.style.position = 'absolute';
  421. statusDiv.style.height = '1px';
  422. statusDiv.style.width = '1px';
  423. statusDiv.style.overflow = 'hidden';
  424. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  425. statusDiv.setAttribute( 'id', 'aria-status-div' );
  426. statusDiv.setAttribute( 'aria-live', 'polite' );
  427. statusDiv.setAttribute( 'aria-atomic','true' );
  428. dom.wrapper.appendChild( statusDiv );
  429. }
  430. return statusDiv;
  431. }
  432. /**
  433. * Converts the given HTML element into a string of text
  434. * that can be announced to a screen reader. Hidden
  435. * elements are excluded.
  436. */
  437. function getStatusText( node ) {
  438. var text = '';
  439. // Text node
  440. if( node.nodeType === 3 ) {
  441. text += node.textContent;
  442. }
  443. // Element node
  444. else if( node.nodeType === 1 ) {
  445. var isAriaHidden = node.getAttribute( 'aria-hidden' );
  446. var isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
  447. if( isAriaHidden !== 'true' && !isDisplayHidden ) {
  448. toArray( node.childNodes ).forEach( function( child ) {
  449. text += getStatusText( child );
  450. } );
  451. }
  452. }
  453. return text;
  454. }
  455. /**
  456. * Configures the presentation for printing to a static
  457. * PDF.
  458. */
  459. function setupPDF() {
  460. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  461. // Dimensions of the PDF pages
  462. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  463. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  464. // Dimensions of slides within the pages
  465. var slideWidth = slideSize.width,
  466. slideHeight = slideSize.height;
  467. // Let the browser know what page size we want to print
  468. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
  469. // Limit the size of certain elements to the dimensions of the slide
  470. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  471. document.body.classList.add( 'print-pdf' );
  472. document.body.style.width = pageWidth + 'px';
  473. document.body.style.height = pageHeight + 'px';
  474. // Add each slide's index as attributes on itself, we need these
  475. // indices to generate slide numbers below
  476. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  477. hslide.setAttribute( 'data-index-h', h );
  478. if( hslide.classList.contains( 'stack' ) ) {
  479. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  480. vslide.setAttribute( 'data-index-h', h );
  481. vslide.setAttribute( 'data-index-v', v );
  482. } );
  483. }
  484. } );
  485. // Slide and slide background layout
  486. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  487. // Vertical stacks are not centred since their section
  488. // children will be
  489. if( slide.classList.contains( 'stack' ) === false ) {
  490. // Center the slide inside of the page, giving the slide some margin
  491. var left = ( pageWidth - slideWidth ) / 2,
  492. top = ( pageHeight - slideHeight ) / 2;
  493. var contentHeight = slide.scrollHeight;
  494. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  495. // Adhere to configured pages per slide limit
  496. numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
  497. // Center slides vertically
  498. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  499. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  500. }
  501. // Wrap the slide in a page element and hide its overflow
  502. // so that no page ever flows onto another
  503. var page = document.createElement( 'div' );
  504. page.className = 'pdf-page';
  505. // Set the total height of the PDF page container.
  506. //
  507. // This is offset by -1 to ensure that the page ends and
  508. // breaks within the document/paper height. Ending exactly
  509. // on the document height breaks in-browser printing, but
  510. // works in CLI printing (phantomjs, wkpdf etc]).
  511. page.style.height = ( ( pageHeight - 1 ) * numberOfPages ) + 'px';
  512. slide.parentNode.insertBefore( page, slide );
  513. page.appendChild( slide );
  514. // Position the slide inside of the page
  515. slide.style.left = left + 'px';
  516. slide.style.top = top + 'px';
  517. slide.style.width = slideWidth + 'px';
  518. if( slide.slideBackgroundElement ) {
  519. page.insertBefore( slide.slideBackgroundElement, slide );
  520. }
  521. // Inject notes if `showNotes` is enabled
  522. if( config.showNotes ) {
  523. // Are there notes for this slide?
  524. var notes = getSlideNotes( slide );
  525. if( notes ) {
  526. var notesSpacing = 8;
  527. var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
  528. var notesElement = document.createElement( 'div' );
  529. notesElement.classList.add( 'speaker-notes' );
  530. notesElement.classList.add( 'speaker-notes-pdf' );
  531. notesElement.setAttribute( 'data-layout', notesLayout );
  532. notesElement.innerHTML = notes;
  533. if( notesLayout === 'separate-page' ) {
  534. page.parentNode.insertBefore( notesElement, page.nextSibling );
  535. }
  536. else {
  537. notesElement.style.left = notesSpacing + 'px';
  538. notesElement.style.bottom = notesSpacing + 'px';
  539. notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
  540. page.appendChild( notesElement );
  541. }
  542. }
  543. }
  544. // Inject slide numbers if `slideNumbers` are enabled
  545. if( config.slideNumber && /all|print/i.test( config.showSlideNumber ) ) {
  546. var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1,
  547. slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1;
  548. var numberElement = document.createElement( 'div' );
  549. numberElement.classList.add( 'slide-number' );
  550. numberElement.classList.add( 'slide-number-pdf' );
  551. numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV );
  552. page.appendChild( numberElement );
  553. }
  554. }
  555. } );
  556. // Show all fragments
  557. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
  558. fragment.classList.add( 'visible' );
  559. } );
  560. // Notify subscribers that the PDF layout is good to go
  561. dispatchEvent( 'pdf-ready' );
  562. }
  563. /**
  564. * This is an unfortunate necessity. Some actions – such as
  565. * an input field being focused in an iframe or using the
  566. * keyboard to expand text selection beyond the bounds of
  567. * a slide – can trigger our content to be pushed out of view.
  568. * This scrolling can not be prevented by hiding overflow in
  569. * CSS (we already do) so we have to resort to repeatedly
  570. * checking if the slides have been offset :(
  571. */
  572. function setupScrollPrevention() {
  573. setInterval( function() {
  574. if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
  575. dom.wrapper.scrollTop = 0;
  576. dom.wrapper.scrollLeft = 0;
  577. }
  578. }, 1000 );
  579. }
  580. /**
  581. * Creates an HTML element and returns a reference to it.
  582. * If the element already exists the existing instance will
  583. * be returned.
  584. *
  585. * @param {HTMLElement} container
  586. * @param {string} tagname
  587. * @param {string} classname
  588. * @param {string} innerHTML
  589. *
  590. * @return {HTMLElement}
  591. */
  592. function createSingletonNode( container, tagname, classname, innerHTML ) {
  593. // Find all nodes matching the description
  594. var nodes = container.querySelectorAll( '.' + classname );
  595. // Check all matches to find one which is a direct child of
  596. // the specified container
  597. for( var i = 0; i < nodes.length; i++ ) {
  598. var testNode = nodes[i];
  599. if( testNode.parentNode === container ) {
  600. return testNode;
  601. }
  602. }
  603. // If no node was found, create it now
  604. var node = document.createElement( tagname );
  605. node.classList.add( classname );
  606. if( typeof innerHTML === 'string' ) {
  607. node.innerHTML = innerHTML;
  608. }
  609. container.appendChild( node );
  610. return node;
  611. }
  612. /**
  613. * Creates the slide background elements and appends them
  614. * to the background container. One element is created per
  615. * slide no matter if the given slide has visible background.
  616. */
  617. function createBackgrounds() {
  618. var printMode = isPrintingPDF();
  619. // Clear prior backgrounds
  620. dom.background.innerHTML = '';
  621. dom.background.classList.add( 'no-transition' );
  622. // Iterate over all horizontal slides
  623. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  624. var backgroundStack = createBackground( slideh, dom.background );
  625. // Iterate over all vertical slides
  626. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  627. createBackground( slidev, backgroundStack );
  628. backgroundStack.classList.add( 'stack' );
  629. } );
  630. } );
  631. // Add parallax background if specified
  632. if( config.parallaxBackgroundImage ) {
  633. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  634. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  635. // Make sure the below properties are set on the element - these properties are
  636. // needed for proper transitions to be set on the element via CSS. To remove
  637. // annoying background slide-in effect when the presentation starts, apply
  638. // these properties after short time delay
  639. setTimeout( function() {
  640. dom.wrapper.classList.add( 'has-parallax-background' );
  641. }, 1 );
  642. }
  643. else {
  644. dom.background.style.backgroundImage = '';
  645. dom.wrapper.classList.remove( 'has-parallax-background' );
  646. }
  647. }
  648. /**
  649. * Creates a background for the given slide.
  650. *
  651. * @param {HTMLElement} slide
  652. * @param {HTMLElement} container The element that the background
  653. * should be appended to
  654. * @return {HTMLElement} New background div
  655. */
  656. function createBackground( slide, container ) {
  657. var data = {
  658. background: slide.getAttribute( 'data-background' ),
  659. backgroundSize: slide.getAttribute( 'data-background-size' ),
  660. backgroundImage: slide.getAttribute( 'data-background-image' ),
  661. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  662. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  663. backgroundColor: slide.getAttribute( 'data-background-color' ),
  664. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  665. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  666. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  667. };
  668. var element = document.createElement( 'div' );
  669. // Carry over custom classes from the slide to the background
  670. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  671. if( data.background ) {
  672. // Auto-wrap image urls in url(...)
  673. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#]|$)/gi.test( data.background ) ) {
  674. slide.setAttribute( 'data-background-image', data.background );
  675. }
  676. else {
  677. element.style.background = data.background;
  678. }
  679. }
  680. // Create a hash for this combination of background settings.
  681. // This is used to determine when two slide backgrounds are
  682. // the same.
  683. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  684. element.setAttribute( 'data-background-hash', data.background +
  685. data.backgroundSize +
  686. data.backgroundImage +
  687. data.backgroundVideo +
  688. data.backgroundIframe +
  689. data.backgroundColor +
  690. data.backgroundRepeat +
  691. data.backgroundPosition +
  692. data.backgroundTransition );
  693. }
  694. // Additional and optional background properties
  695. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  696. if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );
  697. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  698. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  699. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  700. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  701. container.appendChild( element );
  702. // If backgrounds are being recreated, clear old classes
  703. slide.classList.remove( 'has-dark-background' );
  704. slide.classList.remove( 'has-light-background' );
  705. slide.slideBackgroundElement = element;
  706. // If this slide has a background color, add a class that
  707. // signals if it is light or dark. If the slide has no background
  708. // color, no class will be set
  709. var computedBackgroundStyle = window.getComputedStyle( element );
  710. if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
  711. var rgb = colorToRgb( computedBackgroundStyle.backgroundColor );
  712. // Ignore fully transparent backgrounds. Some browsers return
  713. // rgba(0,0,0,0) when reading the computed background color of
  714. // an element with no background
  715. if( rgb && rgb.a !== 0 ) {
  716. if( colorBrightness( computedBackgroundStyle.backgroundColor ) < 128 ) {
  717. slide.classList.add( 'has-dark-background' );
  718. }
  719. else {
  720. slide.classList.add( 'has-light-background' );
  721. }
  722. }
  723. }
  724. return element;
  725. }
  726. /**
  727. * Registers a listener to postMessage events, this makes it
  728. * possible to call all reveal.js API methods from another
  729. * window. For example:
  730. *
  731. * revealWindow.postMessage( JSON.stringify({
  732. * method: 'slide',
  733. * args: [ 2 ]
  734. * }), '*' );
  735. */
  736. function setupPostMessage() {
  737. if( config.postMessage ) {
  738. window.addEventListener( 'message', function ( event ) {
  739. var data = event.data;
  740. // Make sure we're dealing with JSON
  741. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  742. data = JSON.parse( data );
  743. // Check if the requested method can be found
  744. if( data.method && typeof Reveal[data.method] === 'function' ) {
  745. Reveal[data.method].apply( Reveal, data.args );
  746. }
  747. }
  748. }, false );
  749. }
  750. }
  751. /**
  752. * Applies the configuration settings from the config
  753. * object. May be called multiple times.
  754. *
  755. * @param {object} options
  756. */
  757. function configure( options ) {
  758. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  759. dom.wrapper.classList.remove( config.transition );
  760. // New config options may be passed when this method
  761. // is invoked through the API after initialization
  762. if( typeof options === 'object' ) extend( config, options );
  763. // Force linear transition based on browser capabilities
  764. if( features.transforms3d === false ) config.transition = 'linear';
  765. dom.wrapper.classList.add( config.transition );
  766. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  767. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  768. dom.controls.style.display = config.controls ? 'block' : 'none';
  769. dom.progress.style.display = config.progress ? 'block' : 'none';
  770. if( config.shuffle ) {
  771. shuffle();
  772. }
  773. if( config.rtl ) {
  774. dom.wrapper.classList.add( 'rtl' );
  775. }
  776. else {
  777. dom.wrapper.classList.remove( 'rtl' );
  778. }
  779. if( config.center ) {
  780. dom.wrapper.classList.add( 'center' );
  781. }
  782. else {
  783. dom.wrapper.classList.remove( 'center' );
  784. }
  785. // Exit the paused mode if it was configured off
  786. if( config.pause === false ) {
  787. resume();
  788. }
  789. if( config.showNotes ) {
  790. dom.speakerNotes.classList.add( 'visible' );
  791. dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
  792. }
  793. else {
  794. dom.speakerNotes.classList.remove( 'visible' );
  795. }
  796. if( config.mouseWheel ) {
  797. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  798. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  799. }
  800. else {
  801. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  802. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  803. }
  804. // Rolling 3D links
  805. if( config.rollingLinks ) {
  806. enableRollingLinks();
  807. }
  808. else {
  809. disableRollingLinks();
  810. }
  811. // Iframe link previews
  812. if( config.previewLinks ) {
  813. enablePreviewLinks();
  814. disablePreviewLinks( '[data-preview-link=false]' );
  815. }
  816. else {
  817. disablePreviewLinks();
  818. enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
  819. }
  820. // Remove existing auto-slide controls
  821. if( autoSlidePlayer ) {
  822. autoSlidePlayer.destroy();
  823. autoSlidePlayer = null;
  824. }
  825. // Generate auto-slide controls if needed
  826. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  827. autoSlidePlayer = new Playback( dom.wrapper, function() {
  828. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  829. } );
  830. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  831. autoSlidePaused = false;
  832. }
  833. // When fragments are turned off they should be visible
  834. if( config.fragments === false ) {
  835. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  836. element.classList.add( 'visible' );
  837. element.classList.remove( 'current-fragment' );
  838. } );
  839. }
  840. // Slide numbers
  841. var slideNumberDisplay = 'none';
  842. if( config.slideNumber && !isPrintingPDF() ) {
  843. if( config.showSlideNumber === 'all' ) {
  844. slideNumberDisplay = 'block';
  845. }
  846. else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) {
  847. slideNumberDisplay = 'block';
  848. }
  849. }
  850. dom.slideNumber.style.display = slideNumberDisplay;
  851. sync();
  852. }
  853. /**
  854. * Binds all event listeners.
  855. */
  856. function addEventListeners() {
  857. eventsAreBound = true;
  858. window.addEventListener( 'hashchange', onWindowHashChange, false );
  859. window.addEventListener( 'resize', onWindowResize, false );
  860. if( config.touch ) {
  861. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  862. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  863. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  864. // Support pointer-style touch interaction as well
  865. if( window.navigator.pointerEnabled ) {
  866. // IE 11 uses un-prefixed version of pointer events
  867. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  868. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  869. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  870. }
  871. else if( window.navigator.msPointerEnabled ) {
  872. // IE 10 uses prefixed version of pointer events
  873. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  874. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  875. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  876. }
  877. }
  878. if( config.keyboard ) {
  879. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  880. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  881. }
  882. if( config.progress && dom.progress ) {
  883. dom.progress.addEventListener( 'click', onProgressClicked, false );
  884. }
  885. if( config.focusBodyOnPageVisibilityChange ) {
  886. var visibilityChange;
  887. if( 'hidden' in document ) {
  888. visibilityChange = 'visibilitychange';
  889. }
  890. else if( 'msHidden' in document ) {
  891. visibilityChange = 'msvisibilitychange';
  892. }
  893. else if( 'webkitHidden' in document ) {
  894. visibilityChange = 'webkitvisibilitychange';
  895. }
  896. if( visibilityChange ) {
  897. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  898. }
  899. }
  900. // Listen to both touch and click events, in case the device
  901. // supports both
  902. var pointerEvents = [ 'touchstart', 'click' ];
  903. // Only support touch for Android, fixes double navigations in
  904. // stock browser
  905. if( UA.match( /android/gi ) ) {
  906. pointerEvents = [ 'touchstart' ];
  907. }
  908. pointerEvents.forEach( function( eventName ) {
  909. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  910. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  911. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  912. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  913. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  914. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  915. } );
  916. }
  917. /**
  918. * Unbinds all event listeners.
  919. */
  920. function removeEventListeners() {
  921. eventsAreBound = false;
  922. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  923. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  924. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  925. window.removeEventListener( 'resize', onWindowResize, false );
  926. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  927. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  928. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  929. // IE11
  930. if( window.navigator.pointerEnabled ) {
  931. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  932. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  933. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  934. }
  935. // IE10
  936. else if( window.navigator.msPointerEnabled ) {
  937. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  938. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  939. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  940. }
  941. if ( config.progress && dom.progress ) {
  942. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  943. }
  944. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  945. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  946. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  947. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  948. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  949. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  950. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  951. } );
  952. }
  953. /**
  954. * Extend object a with the properties of object b.
  955. * If there's a conflict, object b takes precedence.
  956. *
  957. * @param {object} a
  958. * @param {object} b
  959. */
  960. function extend( a, b ) {
  961. for( var i in b ) {
  962. a[ i ] = b[ i ];
  963. }
  964. }
  965. /**
  966. * Converts the target object to an array.
  967. *
  968. * @param {object} o
  969. * @return {object[]}
  970. */
  971. function toArray( o ) {
  972. return Array.prototype.slice.call( o );
  973. }
  974. /**
  975. * Utility for deserializing a value.
  976. *
  977. * @param {*} value
  978. * @return {*}
  979. */
  980. function deserialize( value ) {
  981. if( typeof value === 'string' ) {
  982. if( value === 'null' ) return null;
  983. else if( value === 'true' ) return true;
  984. else if( value === 'false' ) return false;
  985. else if( value.match( /^[\d\.]+$/ ) ) return parseFloat( value );
  986. }
  987. return value;
  988. }
  989. /**
  990. * Measures the distance in pixels between point a
  991. * and point b.
  992. *
  993. * @param {object} a point with x/y properties
  994. * @param {object} b point with x/y properties
  995. *
  996. * @return {number}
  997. */
  998. function distanceBetween( a, b ) {
  999. var dx = a.x - b.x,
  1000. dy = a.y - b.y;
  1001. return Math.sqrt( dx*dx + dy*dy );
  1002. }
  1003. /**
  1004. * Applies a CSS transform to the target element.
  1005. *
  1006. * @param {HTMLElement} element
  1007. * @param {string} transform
  1008. */
  1009. function transformElement( element, transform ) {
  1010. element.style.WebkitTransform = transform;
  1011. element.style.MozTransform = transform;
  1012. element.style.msTransform = transform;
  1013. element.style.transform = transform;
  1014. }
  1015. /**
  1016. * Applies CSS transforms to the slides container. The container
  1017. * is transformed from two separate sources: layout and the overview
  1018. * mode.
  1019. *
  1020. * @param {object} transforms
  1021. */
  1022. function transformSlides( transforms ) {
  1023. // Pick up new transforms from arguments
  1024. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  1025. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  1026. // Apply the transforms to the slides container
  1027. if( slidesTransform.layout ) {
  1028. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  1029. }
  1030. else {
  1031. transformElement( dom.slides, slidesTransform.overview );
  1032. }
  1033. }
  1034. /**
  1035. * Injects the given CSS styles into the DOM.
  1036. *
  1037. * @param {string} value
  1038. */
  1039. function injectStyleSheet( value ) {
  1040. var tag = document.createElement( 'style' );
  1041. tag.type = 'text/css';
  1042. if( tag.styleSheet ) {
  1043. tag.styleSheet.cssText = value;
  1044. }
  1045. else {
  1046. tag.appendChild( document.createTextNode( value ) );
  1047. }
  1048. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  1049. }
  1050. /**
  1051. * Find the closest parent that matches the given
  1052. * selector.
  1053. *
  1054. * @param {HTMLElement} target The child element
  1055. * @param {String} selector The CSS selector to match
  1056. * the parents against
  1057. *
  1058. * @return {HTMLElement} The matched parent or null
  1059. * if no matching parent was found
  1060. */
  1061. function closestParent( target, selector ) {
  1062. var parent = target.parentNode;
  1063. while( parent ) {
  1064. // There's some overhead doing this each time, we don't
  1065. // want to rewrite the element prototype but should still
  1066. // be enough to feature detect once at startup...
  1067. var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
  1068. // If we find a match, we're all set
  1069. if( matchesMethod && matchesMethod.call( parent, selector ) ) {
  1070. return parent;
  1071. }
  1072. // Keep searching
  1073. parent = parent.parentNode;
  1074. }
  1075. return null;
  1076. }
  1077. /**
  1078. * Converts various color input formats to an {r:0,g:0,b:0} object.
  1079. *
  1080. * @param {string} color The string representation of a color
  1081. * @example
  1082. * colorToRgb('#000');
  1083. * @example
  1084. * colorToRgb('#000000');
  1085. * @example
  1086. * colorToRgb('rgb(0,0,0)');
  1087. * @example
  1088. * colorToRgb('rgba(0,0,0)');
  1089. *
  1090. * @return {{r: number, g: number, b: number, [a]: number}|null}
  1091. */
  1092. function colorToRgb( color ) {
  1093. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  1094. if( hex3 && hex3[1] ) {
  1095. hex3 = hex3[1];
  1096. return {
  1097. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  1098. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  1099. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  1100. };
  1101. }
  1102. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  1103. if( hex6 && hex6[1] ) {
  1104. hex6 = hex6[1];
  1105. return {
  1106. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  1107. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  1108. b: parseInt( hex6.substr( 4, 2 ), 16 )
  1109. };
  1110. }
  1111. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  1112. if( rgb ) {
  1113. return {
  1114. r: parseInt( rgb[1], 10 ),
  1115. g: parseInt( rgb[2], 10 ),
  1116. b: parseInt( rgb[3], 10 )
  1117. };
  1118. }
  1119. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  1120. if( rgba ) {
  1121. return {
  1122. r: parseInt( rgba[1], 10 ),
  1123. g: parseInt( rgba[2], 10 ),
  1124. b: parseInt( rgba[3], 10 ),
  1125. a: parseFloat( rgba[4] )
  1126. };
  1127. }
  1128. return null;
  1129. }
  1130. /**
  1131. * Calculates brightness on a scale of 0-255.
  1132. *
  1133. * @param {string} color See colorToRgb for supported formats.
  1134. * @see {@link colorToRgb}
  1135. */
  1136. function colorBrightness( color ) {
  1137. if( typeof color === 'string' ) color = colorToRgb( color );
  1138. if( color ) {
  1139. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  1140. }
  1141. return null;
  1142. }
  1143. /**
  1144. * Returns the remaining height within the parent of the
  1145. * target element.
  1146. *
  1147. * remaining height = [ configured parent height ] - [ current parent height ]
  1148. *
  1149. * @param {HTMLElement} element
  1150. * @param {number} [height]
  1151. */
  1152. function getRemainingHeight( element, height ) {
  1153. height = height || 0;
  1154. if( element ) {
  1155. var newHeight, oldHeight = element.style.height;
  1156. // Change the .stretch element height to 0 in order find the height of all
  1157. // the other elements
  1158. element.style.height = '0px';
  1159. newHeight = height - element.parentNode.offsetHeight;
  1160. // Restore the old height, just in case
  1161. element.style.height = oldHeight + 'px';
  1162. return newHeight;
  1163. }
  1164. return height;
  1165. }
  1166. /**
  1167. * Checks if this instance is being used to print a PDF.
  1168. */
  1169. function isPrintingPDF() {
  1170. return ( /print-pdf/gi ).test( window.location.search );
  1171. }
  1172. /**
  1173. * Hides the address bar if we're on a mobile device.
  1174. */
  1175. function hideAddressBar() {
  1176. if( config.hideAddressBar && isMobileDevice ) {
  1177. // Events that should trigger the address bar to hide
  1178. window.addEventListener( 'load', removeAddressBar, false );
  1179. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1180. }
  1181. }
  1182. /**
  1183. * Causes the address bar to hide on mobile devices,
  1184. * more vertical space ftw.
  1185. */
  1186. function removeAddressBar() {
  1187. setTimeout( function() {
  1188. window.scrollTo( 0, 1 );
  1189. }, 10 );
  1190. }
  1191. /**
  1192. * Dispatches an event of the specified type from the
  1193. * reveal DOM element.
  1194. */
  1195. function dispatchEvent( type, args ) {
  1196. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1197. event.initEvent( type, true, true );
  1198. extend( event, args );
  1199. dom.wrapper.dispatchEvent( event );
  1200. // If we're in an iframe, post each reveal.js event to the
  1201. // parent window. Used by the notes plugin
  1202. if( config.postMessageEvents && window.parent !== window.self ) {
  1203. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  1204. }
  1205. }
  1206. /**
  1207. * Wrap all links in 3D goodness.
  1208. */
  1209. function enableRollingLinks() {
  1210. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1211. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1212. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1213. var anchor = anchors[i];
  1214. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1215. var span = document.createElement('span');
  1216. span.setAttribute('data-title', anchor.text);
  1217. span.innerHTML = anchor.innerHTML;
  1218. anchor.classList.add( 'roll' );
  1219. anchor.innerHTML = '';
  1220. anchor.appendChild(span);
  1221. }
  1222. }
  1223. }
  1224. }
  1225. /**
  1226. * Unwrap all 3D links.
  1227. */
  1228. function disableRollingLinks() {
  1229. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1230. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1231. var anchor = anchors[i];
  1232. var span = anchor.querySelector( 'span' );
  1233. if( span ) {
  1234. anchor.classList.remove( 'roll' );
  1235. anchor.innerHTML = span.innerHTML;
  1236. }
  1237. }
  1238. }
  1239. /**
  1240. * Bind preview frame links.
  1241. *
  1242. * @param {string} [selector=a] - selector for anchors
  1243. */
  1244. function enablePreviewLinks( selector ) {
  1245. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1246. anchors.forEach( function( element ) {
  1247. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1248. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1249. }
  1250. } );
  1251. }
  1252. /**
  1253. * Unbind preview frame links.
  1254. */
  1255. function disablePreviewLinks( selector ) {
  1256. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1257. anchors.forEach( function( element ) {
  1258. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1259. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1260. }
  1261. } );
  1262. }
  1263. /**
  1264. * Opens a preview window for the target URL.
  1265. *
  1266. * @param {string} url - url for preview iframe src
  1267. */
  1268. function showPreview( url ) {
  1269. closeOverlay();
  1270. dom.overlay = document.createElement( 'div' );
  1271. dom.overlay.classList.add( 'overlay' );
  1272. dom.overlay.classList.add( 'overlay-preview' );
  1273. dom.wrapper.appendChild( dom.overlay );
  1274. dom.overlay.innerHTML = [
  1275. '<header>',
  1276. '<a class="close" href="#"><span class="icon"></span></a>',
  1277. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1278. '</header>',
  1279. '<div class="spinner"></div>',
  1280. '<div class="viewport">',
  1281. '<iframe src="'+ url +'"></iframe>',
  1282. '<small class="viewport-inner">',
  1283. '<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>',
  1284. '</small>',
  1285. '</div>'
  1286. ].join('');
  1287. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1288. dom.overlay.classList.add( 'loaded' );
  1289. }, false );
  1290. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1291. closeOverlay();
  1292. event.preventDefault();
  1293. }, false );
  1294. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1295. closeOverlay();
  1296. }, false );
  1297. setTimeout( function() {
  1298. dom.overlay.classList.add( 'visible' );
  1299. }, 1 );
  1300. }
  1301. /**
  1302. * Open or close help overlay window.
  1303. *
  1304. * @param {Boolean} [override] Flag which overrides the
  1305. * toggle logic and forcibly sets the desired state. True means
  1306. * help is open, false means it's closed.
  1307. */
  1308. function toggleHelp( override ){
  1309. if( typeof override === 'boolean' ) {
  1310. override ? showHelp() : closeOverlay();
  1311. }
  1312. else {
  1313. if( dom.overlay ) {
  1314. closeOverlay();
  1315. }
  1316. else {
  1317. showHelp();
  1318. }
  1319. }
  1320. }
  1321. /**
  1322. * Opens an overlay window with help material.
  1323. */
  1324. function showHelp() {
  1325. if( config.help ) {
  1326. closeOverlay();
  1327. dom.overlay = document.createElement( 'div' );
  1328. dom.overlay.classList.add( 'overlay' );
  1329. dom.overlay.classList.add( 'overlay-help' );
  1330. dom.wrapper.appendChild( dom.overlay );
  1331. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1332. html += '<table><th>KEY</th><th>ACTION</th>';
  1333. for( var key in keyboardShortcuts ) {
  1334. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1335. }
  1336. html += '</table>';
  1337. dom.overlay.innerHTML = [
  1338. '<header>',
  1339. '<a class="close" href="#"><span class="icon"></span></a>',
  1340. '</header>',
  1341. '<div class="viewport">',
  1342. '<div class="viewport-inner">'+ html +'</div>',
  1343. '</div>'
  1344. ].join('');
  1345. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1346. closeOverlay();
  1347. event.preventDefault();
  1348. }, false );
  1349. setTimeout( function() {
  1350. dom.overlay.classList.add( 'visible' );
  1351. }, 1 );
  1352. }
  1353. }
  1354. /**
  1355. * Closes any currently open overlay.
  1356. */
  1357. function closeOverlay() {
  1358. if( dom.overlay ) {
  1359. dom.overlay.parentNode.removeChild( dom.overlay );
  1360. dom.overlay = null;
  1361. }
  1362. }
  1363. /**
  1364. * Applies JavaScript-controlled layout rules to the
  1365. * presentation.
  1366. */
  1367. function layout() {
  1368. if( dom.wrapper && !isPrintingPDF() ) {
  1369. var size = getComputedSlideSize();
  1370. // Layout the contents of the slides
  1371. layoutSlideContents( config.width, config.height );
  1372. dom.slides.style.width = size.width + 'px';
  1373. dom.slides.style.height = size.height + 'px';
  1374. // Determine scale of content to fit within available space
  1375. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1376. // Respect max/min scale settings
  1377. scale = Math.max( scale, config.minScale );
  1378. scale = Math.min( scale, config.maxScale );
  1379. // Don't apply any scaling styles if scale is 1
  1380. if( scale === 1 ) {
  1381. dom.slides.style.zoom = '';
  1382. dom.slides.style.left = '';
  1383. dom.slides.style.top = '';
  1384. dom.slides.style.bottom = '';
  1385. dom.slides.style.right = '';
  1386. transformSlides( { layout: '' } );
  1387. }
  1388. else {
  1389. // Prefer zoom for scaling up so that content remains crisp.
  1390. // Don't use zoom to scale down since that can lead to shifts
  1391. // in text layout/line breaks.
  1392. if( scale > 1 && features.zoom ) {
  1393. dom.slides.style.zoom = scale;
  1394. dom.slides.style.left = '';
  1395. dom.slides.style.top = '';
  1396. dom.slides.style.bottom = '';
  1397. dom.slides.style.right = '';
  1398. transformSlides( { layout: '' } );
  1399. }
  1400. // Apply scale transform as a fallback
  1401. else {
  1402. dom.slides.style.zoom = '';
  1403. dom.slides.style.left = '50%';
  1404. dom.slides.style.top = '50%';
  1405. dom.slides.style.bottom = 'auto';
  1406. dom.slides.style.right = 'auto';
  1407. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1408. }
  1409. }
  1410. // Select all slides, vertical and horizontal
  1411. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1412. for( var i = 0, len = slides.length; i < len; i++ ) {
  1413. var slide = slides[ i ];
  1414. // Don't bother updating invisible slides
  1415. if( slide.style.display === 'none' ) {
  1416. continue;
  1417. }
  1418. if( config.center || slide.classList.contains( 'center' ) ) {
  1419. // Vertical stacks are not centred since their section
  1420. // children will be
  1421. if( slide.classList.contains( 'stack' ) ) {
  1422. slide.style.top = 0;
  1423. }
  1424. else {
  1425. slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
  1426. }
  1427. }
  1428. else {
  1429. slide.style.top = '';
  1430. }
  1431. }
  1432. updateProgress();
  1433. updateParallax();
  1434. if( isOverview() ) {
  1435. updateOverview();
  1436. }
  1437. }
  1438. }
  1439. /**
  1440. * Applies layout logic to the contents of all slides in
  1441. * the presentation.
  1442. *
  1443. * @param {string|number} width
  1444. * @param {string|number} height
  1445. */
  1446. function layoutSlideContents( width, height ) {
  1447. // Handle sizing of elements with the 'stretch' class
  1448. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1449. // Determine how much vertical space we can use
  1450. var remainingHeight = getRemainingHeight( element, height );
  1451. // Consider the aspect ratio of media elements
  1452. if( /(img|video)/gi.test( element.nodeName ) ) {
  1453. var nw = element.naturalWidth || element.videoWidth,
  1454. nh = element.naturalHeight || element.videoHeight;
  1455. var es = Math.min( width / nw, remainingHeight / nh );
  1456. element.style.width = ( nw * es ) + 'px';
  1457. element.style.height = ( nh * es ) + 'px';
  1458. }
  1459. else {
  1460. element.style.width = width + 'px';
  1461. element.style.height = remainingHeight + 'px';
  1462. }
  1463. } );
  1464. }
  1465. /**
  1466. * Calculates the computed pixel size of our slides. These
  1467. * values are based on the width and height configuration
  1468. * options.
  1469. *
  1470. * @param {number} [presentationWidth=dom.wrapper.offsetWidth]
  1471. * @param {number} [presentationHeight=dom.wrapper.offsetHeight]
  1472. */
  1473. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1474. var size = {
  1475. // Slide size
  1476. width: config.width,
  1477. height: config.height,
  1478. // Presentation size
  1479. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1480. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1481. };
  1482. // Reduce available space by margin
  1483. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1484. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1485. // Slide width may be a percentage of available width
  1486. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1487. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1488. }
  1489. // Slide height may be a percentage of available height
  1490. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1491. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1492. }
  1493. return size;
  1494. }
  1495. /**
  1496. * Stores the vertical index of a stack so that the same
  1497. * vertical slide can be selected when navigating to and
  1498. * from the stack.
  1499. *
  1500. * @param {HTMLElement} stack The vertical stack element
  1501. * @param {string|number} [v=0] Index to memorize
  1502. */
  1503. function setPreviousVerticalIndex( stack, v ) {
  1504. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1505. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1506. }
  1507. }
  1508. /**
  1509. * Retrieves the vertical index which was stored using
  1510. * #setPreviousVerticalIndex() or 0 if no previous index
  1511. * exists.
  1512. *
  1513. * @param {HTMLElement} stack The vertical stack element
  1514. */
  1515. function getPreviousVerticalIndex( stack ) {
  1516. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1517. // Prefer manually defined start-indexv
  1518. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1519. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1520. }
  1521. return 0;
  1522. }
  1523. /**
  1524. * Displays the overview of slides (quick nav) by scaling
  1525. * down and arranging all slide elements.
  1526. */
  1527. function activateOverview() {
  1528. // Only proceed if enabled in config
  1529. if( config.overview && !isOverview() ) {
  1530. overview = true;
  1531. dom.wrapper.classList.add( 'overview' );
  1532. dom.wrapper.classList.remove( 'overview-deactivating' );
  1533. if( features.overviewTransitions ) {
  1534. setTimeout( function() {
  1535. dom.wrapper.classList.add( 'overview-animated' );
  1536. }, 1 );
  1537. }
  1538. // Don't auto-slide while in overview mode
  1539. cancelAutoSlide();
  1540. // Move the backgrounds element into the slide container to
  1541. // that the same scaling is applied
  1542. dom.slides.appendChild( dom.background );
  1543. // Clicking on an overview slide navigates to it
  1544. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1545. if( !slide.classList.contains( 'stack' ) ) {
  1546. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1547. }
  1548. } );
  1549. // Calculate slide sizes
  1550. var margin = 70;
  1551. var slideSize = getComputedSlideSize();
  1552. overviewSlideWidth = slideSize.width + margin;
  1553. overviewSlideHeight = slideSize.height + margin;
  1554. // Reverse in RTL mode
  1555. if( config.rtl ) {
  1556. overviewSlideWidth = -overviewSlideWidth;
  1557. }
  1558. updateSlidesVisibility();
  1559. layoutOverview();
  1560. updateOverview();
  1561. layout();
  1562. // Notify observers of the overview showing
  1563. dispatchEvent( 'overviewshown', {
  1564. 'indexh': indexh,
  1565. 'indexv': indexv,
  1566. 'currentSlide': currentSlide
  1567. } );
  1568. }
  1569. }
  1570. /**
  1571. * Uses CSS transforms to position all slides in a grid for
  1572. * display inside of the overview mode.
  1573. */
  1574. function layoutOverview() {
  1575. // Layout slides
  1576. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1577. hslide.setAttribute( 'data-index-h', h );
  1578. transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1579. if( hslide.classList.contains( 'stack' ) ) {
  1580. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1581. vslide.setAttribute( 'data-index-h', h );
  1582. vslide.setAttribute( 'data-index-v', v );
  1583. transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1584. } );
  1585. }
  1586. } );
  1587. // Layout slide backgrounds
  1588. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1589. transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1590. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1591. transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1592. } );
  1593. } );
  1594. }
  1595. /**
  1596. * Moves the overview viewport to the current slides.
  1597. * Called each time the current slide changes.
  1598. */
  1599. function updateOverview() {
  1600. var vmin = Math.min( window.innerWidth, window.innerHeight );
  1601. var scale = Math.max( vmin / 5, 150 ) / vmin;
  1602. transformSlides( {
  1603. overview: [
  1604. 'scale('+ scale +')',
  1605. 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
  1606. 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)'
  1607. ].join( ' ' )
  1608. } );
  1609. }
  1610. /**
  1611. * Exits the slide overview and enters the currently
  1612. * active slide.
  1613. */
  1614. function deactivateOverview() {
  1615. // Only proceed if enabled in config
  1616. if( config.overview ) {
  1617. overview = false;
  1618. dom.wrapper.classList.remove( 'overview' );
  1619. dom.wrapper.classList.remove( 'overview-animated' );
  1620. // Temporarily add a class so that transitions can do different things
  1621. // depending on whether they are exiting/entering overview, or just
  1622. // moving from slide to slide
  1623. dom.wrapper.classList.add( 'overview-deactivating' );
  1624. setTimeout( function () {
  1625. dom.wrapper.classList.remove( 'overview-deactivating' );
  1626. }, 1 );
  1627. // Move the background element back out
  1628. dom.wrapper.appendChild( dom.background );
  1629. // Clean up changes made to slides
  1630. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1631. transformElement( slide, '' );
  1632. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1633. } );
  1634. // Clean up changes made to backgrounds
  1635. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  1636. transformElement( background, '' );
  1637. } );
  1638. transformSlides( { overview: '' } );
  1639. slide( indexh, indexv );
  1640. layout();
  1641. cueAutoSlide();
  1642. // Notify observers of the overview hiding
  1643. dispatchEvent( 'overviewhidden', {
  1644. 'indexh': indexh,
  1645. 'indexv': indexv,
  1646. 'currentSlide': currentSlide
  1647. } );
  1648. }
  1649. }
  1650. /**
  1651. * Toggles the slide overview mode on and off.
  1652. *
  1653. * @param {Boolean} [override] Flag which overrides the
  1654. * toggle logic and forcibly sets the desired state. True means
  1655. * overview is open, false means it's closed.
  1656. */
  1657. function toggleOverview( override ) {
  1658. if( typeof override === 'boolean' ) {
  1659. override ? activateOverview() : deactivateOverview();
  1660. }
  1661. else {
  1662. isOverview() ? deactivateOverview() : activateOverview();
  1663. }
  1664. }
  1665. /**
  1666. * Checks if the overview is currently active.
  1667. *
  1668. * @return {Boolean} true if the overview is active,
  1669. * false otherwise
  1670. */
  1671. function isOverview() {
  1672. return overview;
  1673. }
  1674. /**
  1675. * Checks if the current or specified slide is vertical
  1676. * (nested within another slide).
  1677. *
  1678. * @param {HTMLElement} [slide=currentSlide] The slide to check
  1679. * orientation of
  1680. * @return {Boolean}
  1681. */
  1682. function isVerticalSlide( slide ) {
  1683. // Prefer slide argument, otherwise use current slide
  1684. slide = slide ? slide : currentSlide;
  1685. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1686. }
  1687. /**
  1688. * Handling the fullscreen functionality via the fullscreen API
  1689. *
  1690. * @see http://fullscreen.spec.whatwg.org/
  1691. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1692. */
  1693. function enterFullscreen() {
  1694. var element = document.documentElement;
  1695. // Check which implementation is available
  1696. var requestMethod = element.requestFullscreen ||
  1697. element.webkitRequestFullscreen ||
  1698. element.webkitRequestFullScreen ||
  1699. element.mozRequestFullScreen ||
  1700. element.msRequestFullscreen;
  1701. if( requestMethod ) {
  1702. requestMethod.apply( element );
  1703. }
  1704. }
  1705. /**
  1706. * Enters the paused mode which fades everything on screen to
  1707. * black.
  1708. */
  1709. function pause() {
  1710. if( config.pause ) {
  1711. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1712. cancelAutoSlide();
  1713. dom.wrapper.classList.add( 'paused' );
  1714. if( wasPaused === false ) {
  1715. dispatchEvent( 'paused' );
  1716. }
  1717. }
  1718. }
  1719. /**
  1720. * Exits from the paused mode.
  1721. */
  1722. function resume() {
  1723. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1724. dom.wrapper.classList.remove( 'paused' );
  1725. cueAutoSlide();
  1726. if( wasPaused ) {
  1727. dispatchEvent( 'resumed' );
  1728. }
  1729. }
  1730. /**
  1731. * Toggles the paused mode on and off.
  1732. */
  1733. function togglePause( override ) {
  1734. if( typeof override === 'boolean' ) {
  1735. override ? pause() : resume();
  1736. }
  1737. else {
  1738. isPaused() ? resume() : pause();
  1739. }
  1740. }
  1741. /**
  1742. * Checks if we are currently in the paused mode.
  1743. *
  1744. * @return {Boolean}
  1745. */
  1746. function isPaused() {
  1747. return dom.wrapper.classList.contains( 'paused' );
  1748. }
  1749. /**
  1750. * Toggles the auto slide mode on and off.
  1751. *
  1752. * @param {Boolean} [override] Flag which sets the desired state.
  1753. * True means autoplay starts, false means it stops.
  1754. */
  1755. function toggleAutoSlide( override ) {
  1756. if( typeof override === 'boolean' ) {
  1757. override ? resumeAutoSlide() : pauseAutoSlide();
  1758. }
  1759. else {
  1760. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  1761. }
  1762. }
  1763. /**
  1764. * Checks if the auto slide mode is currently on.
  1765. *
  1766. * @return {Boolean}
  1767. */
  1768. function isAutoSliding() {
  1769. return !!( autoSlide && !autoSlidePaused );
  1770. }
  1771. /**
  1772. * Steps from the current point in the presentation to the
  1773. * slide which matches the specified horizontal and vertical
  1774. * indices.
  1775. *
  1776. * @param {number} [h=indexh] Horizontal index of the target slide
  1777. * @param {number} [v=indexv] Vertical index of the target slide
  1778. * @param {number} [f] Index of a fragment within the
  1779. * target slide to activate
  1780. * @param {number} [o] Origin for use in multimaster environments
  1781. */
  1782. function slide( h, v, f, o ) {
  1783. // Remember where we were at before
  1784. previousSlide = currentSlide;
  1785. // Query all horizontal slides in the deck
  1786. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1787. // Abort if there are no slides
  1788. if( horizontalSlides.length === 0 ) return;
  1789. // If no vertical index is specified and the upcoming slide is a
  1790. // stack, resume at its previous vertical index
  1791. if( v === undefined && !isOverview() ) {
  1792. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1793. }
  1794. // If we were on a vertical stack, remember what vertical index
  1795. // it was on so we can resume at the same position when returning
  1796. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1797. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1798. }
  1799. // Remember the state before this slide
  1800. var stateBefore = state.concat();
  1801. // Reset the state array
  1802. state.length = 0;
  1803. var indexhBefore = indexh || 0,
  1804. indexvBefore = indexv || 0;
  1805. // Activate and transition to the new slide
  1806. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1807. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1808. // Update the visibility of slides now that the indices have changed
  1809. updateSlidesVisibility();
  1810. layout();
  1811. // Apply the new state
  1812. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1813. // Check if this state existed on the previous slide. If it
  1814. // did, we will avoid adding it repeatedly
  1815. for( var j = 0; j < stateBefore.length; j++ ) {
  1816. if( stateBefore[j] === state[i] ) {
  1817. stateBefore.splice( j, 1 );
  1818. continue stateLoop;
  1819. }
  1820. }
  1821. document.documentElement.classList.add( state[i] );
  1822. // Dispatch custom event matching the state's name
  1823. dispatchEvent( state[i] );
  1824. }
  1825. // Clean up the remains of the previous state
  1826. while( stateBefore.length ) {
  1827. document.documentElement.classList.remove( stateBefore.pop() );
  1828. }
  1829. // Update the overview if it's currently active
  1830. if( isOverview() ) {
  1831. updateOverview();
  1832. }
  1833. // Find the current horizontal slide and any possible vertical slides
  1834. // within it
  1835. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1836. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1837. // Store references to the previous and current slides
  1838. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1839. // Show fragment, if specified
  1840. if( typeof f !== 'undefined' ) {
  1841. navigateFragment( f );
  1842. }
  1843. // Dispatch an event if the slide changed
  1844. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1845. if( slideChanged ) {
  1846. dispatchEvent( 'slidechanged', {
  1847. 'indexh': indexh,
  1848. 'indexv': indexv,
  1849. 'previousSlide': previousSlide,
  1850. 'currentSlide': currentSlide,
  1851. 'origin': o
  1852. } );
  1853. }
  1854. else {
  1855. // Ensure that the previous slide is never the same as the current
  1856. previousSlide = null;
  1857. }
  1858. // Solves an edge case where the previous slide maintains the
  1859. // 'present' class when navigating between adjacent vertical
  1860. // stacks
  1861. if( previousSlide ) {
  1862. previousSlide.classList.remove( 'present' );
  1863. previousSlide.setAttribute( 'aria-hidden', 'true' );
  1864. // Reset all slides upon navigate to home
  1865. // Issue: #285
  1866. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1867. // Launch async task
  1868. setTimeout( function () {
  1869. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1870. for( i in slides ) {
  1871. if( slides[i] ) {
  1872. // Reset stack
  1873. setPreviousVerticalIndex( slides[i], 0 );
  1874. }
  1875. }
  1876. }, 0 );
  1877. }
  1878. }
  1879. // Handle embedded content
  1880. if( slideChanged || !previousSlide ) {
  1881. stopEmbeddedContent( previousSlide );
  1882. startEmbeddedContent( currentSlide );
  1883. }
  1884. // Announce the current slide contents, for screen readers
  1885. dom.statusDiv.textContent = getStatusText( currentSlide );
  1886. updateControls();
  1887. updateProgress();
  1888. updateBackground();
  1889. updateParallax();
  1890. updateSlideNumber();
  1891. updateNotes();
  1892. // Update the URL hash
  1893. writeURL();
  1894. cueAutoSlide();
  1895. }
  1896. /**
  1897. * Syncs the presentation with the current DOM. Useful
  1898. * when new slides or control elements are added or when
  1899. * the configuration has changed.
  1900. */
  1901. function sync() {
  1902. // Subscribe to input
  1903. removeEventListeners();
  1904. addEventListeners();
  1905. // Force a layout to make sure the current config is accounted for
  1906. layout();
  1907. // Reflect the current autoSlide value
  1908. autoSlide = config.autoSlide;
  1909. // Start auto-sliding if it's enabled
  1910. cueAutoSlide();
  1911. // Re-create the slide backgrounds
  1912. createBackgrounds();
  1913. // Write the current hash to the URL
  1914. writeURL();
  1915. sortAllFragments();
  1916. updateControls();
  1917. updateProgress();
  1918. updateSlideNumber();
  1919. updateSlidesVisibility();
  1920. updateBackground( true );
  1921. updateNotes();
  1922. formatEmbeddedContent();
  1923. // Start or stop embedded content depending on global config
  1924. if( config.autoPlayMedia === false ) {
  1925. stopEmbeddedContent( currentSlide );
  1926. }
  1927. else {
  1928. startEmbeddedContent( currentSlide );
  1929. }
  1930. if( isOverview() ) {
  1931. layoutOverview();
  1932. }
  1933. }
  1934. /**
  1935. * Resets all vertical slides so that only the first
  1936. * is visible.
  1937. */
  1938. function resetVerticalSlides() {
  1939. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1940. horizontalSlides.forEach( function( horizontalSlide ) {
  1941. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1942. verticalSlides.forEach( function( verticalSlide, y ) {
  1943. if( y > 0 ) {
  1944. verticalSlide.classList.remove( 'present' );
  1945. verticalSlide.classList.remove( 'past' );
  1946. verticalSlide.classList.add( 'future' );
  1947. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  1948. }
  1949. } );
  1950. } );
  1951. }
  1952. /**
  1953. * Sorts and formats all of fragments in the
  1954. * presentation.
  1955. */
  1956. function sortAllFragments() {
  1957. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1958. horizontalSlides.forEach( function( horizontalSlide ) {
  1959. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1960. verticalSlides.forEach( function( verticalSlide, y ) {
  1961. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  1962. } );
  1963. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  1964. } );
  1965. }
  1966. /**
  1967. * Randomly shuffles all slides in the deck.
  1968. */
  1969. function shuffle() {
  1970. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1971. slides.forEach( function( slide ) {
  1972. // Insert this slide next to another random slide. This may
  1973. // cause the slide to insert before itself but that's fine.
  1974. dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
  1975. } );
  1976. }
  1977. /**
  1978. * Updates one dimension of slides by showing the slide
  1979. * with the specified index.
  1980. *
  1981. * @param {string} selector A CSS selector that will fetch
  1982. * the group of slides we are working with
  1983. * @param {number} index The index of the slide that should be
  1984. * shown
  1985. *
  1986. * @return {number} The index of the slide that is now shown,
  1987. * might differ from the passed in index if it was out of
  1988. * bounds.
  1989. */
  1990. function updateSlides( selector, index ) {
  1991. // Select all slides and convert the NodeList result to
  1992. // an array
  1993. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  1994. slidesLength = slides.length;
  1995. var printMode = isPrintingPDF();
  1996. if( slidesLength ) {
  1997. // Should the index loop?
  1998. if( config.loop ) {
  1999. index %= slidesLength;
  2000. if( index < 0 ) {
  2001. index = slidesLength + index;
  2002. }
  2003. }
  2004. // Enforce max and minimum index bounds
  2005. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  2006. for( var i = 0; i < slidesLength; i++ ) {
  2007. var element = slides[i];
  2008. var reverse = config.rtl && !isVerticalSlide( element );
  2009. element.classList.remove( 'past' );
  2010. element.classList.remove( 'present' );
  2011. element.classList.remove( 'future' );
  2012. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  2013. element.setAttribute( 'hidden', '' );
  2014. element.setAttribute( 'aria-hidden', 'true' );
  2015. // If this element contains vertical slides
  2016. if( element.querySelector( 'section' ) ) {
  2017. element.classList.add( 'stack' );
  2018. }
  2019. // If we're printing static slides, all slides are "present"
  2020. if( printMode ) {
  2021. element.classList.add( 'present' );
  2022. continue;
  2023. }
  2024. if( i < index ) {
  2025. // Any element previous to index is given the 'past' class
  2026. element.classList.add( reverse ? 'future' : 'past' );
  2027. if( config.fragments ) {
  2028. var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
  2029. // Show all fragments on prior slides
  2030. while( pastFragments.length ) {
  2031. var pastFragment = pastFragments.pop();
  2032. pastFragment.classList.add( 'visible' );
  2033. pastFragment.classList.remove( 'current-fragment' );
  2034. }
  2035. }
  2036. }
  2037. else if( i > index ) {
  2038. // Any element subsequent to index is given the 'future' class
  2039. element.classList.add( reverse ? 'past' : 'future' );
  2040. if( config.fragments ) {
  2041. var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  2042. // No fragments in future slides should be visible ahead of time
  2043. while( futureFragments.length ) {
  2044. var futureFragment = futureFragments.pop();
  2045. futureFragment.classList.remove( 'visible' );
  2046. futureFragment.classList.remove( 'current-fragment' );
  2047. }
  2048. }
  2049. }
  2050. }
  2051. // Mark the current slide as present
  2052. slides[index].classList.add( 'present' );
  2053. slides[index].removeAttribute( 'hidden' );
  2054. slides[index].removeAttribute( 'aria-hidden' );
  2055. // If this slide has a state associated with it, add it
  2056. // onto the current state of the deck
  2057. var slideState = slides[index].getAttribute( 'data-state' );
  2058. if( slideState ) {
  2059. state = state.concat( slideState.split( ' ' ) );
  2060. }
  2061. }
  2062. else {
  2063. // Since there are no slides we can't be anywhere beyond the
  2064. // zeroth index
  2065. index = 0;
  2066. }
  2067. return index;
  2068. }
  2069. /**
  2070. * Optimization method; hide all slides that are far away
  2071. * from the present slide.
  2072. */
  2073. function updateSlidesVisibility() {
  2074. // Select all slides and convert the NodeList result to
  2075. // an array
  2076. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  2077. horizontalSlidesLength = horizontalSlides.length,
  2078. distanceX,
  2079. distanceY;
  2080. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  2081. // The number of steps away from the present slide that will
  2082. // be visible
  2083. var viewDistance = isOverview() ? 10 : config.viewDistance;
  2084. // Limit view distance on weaker devices
  2085. if( isMobileDevice ) {
  2086. viewDistance = isOverview() ? 6 : 2;
  2087. }
  2088. // All slides need to be visible when exporting to PDF
  2089. if( isPrintingPDF() ) {
  2090. viewDistance = Number.MAX_VALUE;
  2091. }
  2092. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  2093. var horizontalSlide = horizontalSlides[x];
  2094. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  2095. verticalSlidesLength = verticalSlides.length;
  2096. // Determine how far away this slide is from the present
  2097. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  2098. // If the presentation is looped, distance should measure
  2099. // 1 between the first and last slides
  2100. if( config.loop ) {
  2101. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  2102. }
  2103. // Show the horizontal slide if it's within the view distance
  2104. if( distanceX < viewDistance ) {
  2105. showSlide( horizontalSlide );
  2106. }
  2107. else {
  2108. hideSlide( horizontalSlide );
  2109. }
  2110. if( verticalSlidesLength ) {
  2111. var oy = getPreviousVerticalIndex( horizontalSlide );
  2112. for( var y = 0; y < verticalSlidesLength; y++ ) {
  2113. var verticalSlide = verticalSlides[y];
  2114. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  2115. if( distanceX + distanceY < viewDistance ) {
  2116. showSlide( verticalSlide );
  2117. }
  2118. else {
  2119. hideSlide( verticalSlide );
  2120. }
  2121. }
  2122. }
  2123. }
  2124. }
  2125. }
  2126. /**
  2127. * Pick up notes from the current slide and display them
  2128. * to the viewer.
  2129. *
  2130. * @see {@link config.showNotes}
  2131. */
  2132. function updateNotes() {
  2133. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  2134. dom.speakerNotes.innerHTML = getSlideNotes() || '';
  2135. }
  2136. }
  2137. /**
  2138. * Updates the progress bar to reflect the current slide.
  2139. */
  2140. function updateProgress() {
  2141. // Update progress if enabled
  2142. if( config.progress && dom.progressbar ) {
  2143. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  2144. }
  2145. }
  2146. /**
  2147. * Updates the slide number div to reflect the current slide.
  2148. *
  2149. * The following slide number formats are available:
  2150. * "h.v": horizontal . vertical slide number (default)
  2151. * "h/v": horizontal / vertical slide number
  2152. * "c": flattened slide number
  2153. * "c/t": flattened slide number / total slides
  2154. */
  2155. function updateSlideNumber() {
  2156. // Update slide number if enabled
  2157. if( config.slideNumber && dom.slideNumber ) {
  2158. var value = [];
  2159. var format = 'h.v';
  2160. // Check if a custom number format is available
  2161. if( typeof config.slideNumber === 'string' ) {
  2162. format = config.slideNumber;
  2163. }
  2164. switch( format ) {
  2165. case 'c':
  2166. value.push( getSlidePastCount() + 1 );
  2167. break;
  2168. case 'c/t':
  2169. value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
  2170. break;
  2171. case 'h/v':
  2172. value.push( indexh + 1 );
  2173. if( isVerticalSlide() ) value.push( '/', indexv + 1 );
  2174. break;
  2175. default:
  2176. value.push( indexh + 1 );
  2177. if( isVerticalSlide() ) value.push( '.', indexv + 1 );
  2178. }
  2179. dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
  2180. }
  2181. }
  2182. /**
  2183. * Applies HTML formatting to a slide number before it's
  2184. * written to the DOM.
  2185. *
  2186. * @param {number} a Current slide
  2187. * @param {string} delimiter Character to separate slide numbers
  2188. * @param {(number|*)} b Total slides
  2189. * @return {string} HTML string fragment
  2190. */
  2191. function formatSlideNumber( a, delimiter, b ) {
  2192. if( typeof b === 'number' && !isNaN( b ) ) {
  2193. return '<span class="slide-number-a">'+ a +'</span>' +
  2194. '<span class="slide-number-delimiter">'+ delimiter +'</span>' +
  2195. '<span class="slide-number-b">'+ b +'</span>';
  2196. }
  2197. else {
  2198. return '<span class="slide-number-a">'+ a +'</span>';
  2199. }
  2200. }
  2201. /**
  2202. * Updates the state of all control/navigation arrows.
  2203. */
  2204. function updateControls() {
  2205. var routes = availableRoutes();
  2206. var fragments = availableFragments();
  2207. // Remove the 'enabled' class from all directions
  2208. dom.controlsLeft.concat( dom.controlsRight )
  2209. .concat( dom.controlsUp )
  2210. .concat( dom.controlsDown )
  2211. .concat( dom.controlsPrev )
  2212. .concat( dom.controlsNext ).forEach( function( node ) {
  2213. node.classList.remove( 'enabled' );
  2214. node.classList.remove( 'fragmented' );
  2215. // Set 'disabled' attribute on all directions
  2216. node.setAttribute( 'disabled', 'disabled' );
  2217. } );
  2218. // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
  2219. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2220. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2221. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2222. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2223. // Prev/next buttons
  2224. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2225. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2226. // Highlight fragment directions
  2227. if( currentSlide ) {
  2228. // Always apply fragment decorator to prev/next buttons
  2229. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2230. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2231. // Apply fragment decorators to directional buttons based on
  2232. // what slide axis they are in
  2233. if( isVerticalSlide( currentSlide ) ) {
  2234. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2235. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2236. }
  2237. else {
  2238. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2239. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2240. }
  2241. }
  2242. }
  2243. /**
  2244. * Updates the background elements to reflect the current
  2245. * slide.
  2246. *
  2247. * @param {boolean} includeAll If true, the backgrounds of
  2248. * all vertical slides (not just the present) will be updated.
  2249. */
  2250. function updateBackground( includeAll ) {
  2251. var currentBackground = null;
  2252. // Reverse past/future classes when in RTL mode
  2253. var horizontalPast = config.rtl ? 'future' : 'past',
  2254. horizontalFuture = config.rtl ? 'past' : 'future';
  2255. // Update the classes of all backgrounds to match the
  2256. // states of their slides (past/present/future)
  2257. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2258. backgroundh.classList.remove( 'past' );
  2259. backgroundh.classList.remove( 'present' );
  2260. backgroundh.classList.remove( 'future' );
  2261. if( h < indexh ) {
  2262. backgroundh.classList.add( horizontalPast );
  2263. }
  2264. else if ( h > indexh ) {
  2265. backgroundh.classList.add( horizontalFuture );
  2266. }
  2267. else {
  2268. backgroundh.classList.add( 'present' );
  2269. // Store a reference to the current background element
  2270. currentBackground = backgroundh;
  2271. }
  2272. if( includeAll || h === indexh ) {
  2273. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2274. backgroundv.classList.remove( 'past' );
  2275. backgroundv.classList.remove( 'present' );
  2276. backgroundv.classList.remove( 'future' );
  2277. if( v < indexv ) {
  2278. backgroundv.classList.add( 'past' );
  2279. }
  2280. else if ( v > indexv ) {
  2281. backgroundv.classList.add( 'future' );
  2282. }
  2283. else {
  2284. backgroundv.classList.add( 'present' );
  2285. // Only if this is the present horizontal and vertical slide
  2286. if( h === indexh ) currentBackground = backgroundv;
  2287. }
  2288. } );
  2289. }
  2290. } );
  2291. // Stop content inside of previous backgrounds
  2292. if( previousBackground ) {
  2293. stopEmbeddedContent( previousBackground );
  2294. }
  2295. // Start content in the current background
  2296. if( currentBackground ) {
  2297. startEmbeddedContent( currentBackground );
  2298. var backgroundImageURL = currentBackground.style.backgroundImage || '';
  2299. // Restart GIFs (doesn't work in Firefox)
  2300. if( /\.gif/i.test( backgroundImageURL ) ) {
  2301. currentBackground.style.backgroundImage = '';
  2302. window.getComputedStyle( currentBackground ).opacity;
  2303. currentBackground.style.backgroundImage = backgroundImageURL;
  2304. }
  2305. // Don't transition between identical backgrounds. This
  2306. // prevents unwanted flicker.
  2307. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2308. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2309. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2310. dom.background.classList.add( 'no-transition' );
  2311. }
  2312. previousBackground = currentBackground;
  2313. }
  2314. // If there's a background brightness flag for this slide,
  2315. // bubble it to the .reveal container
  2316. if( currentSlide ) {
  2317. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2318. if( currentSlide.classList.contains( classToBubble ) ) {
  2319. dom.wrapper.classList.add( classToBubble );
  2320. }
  2321. else {
  2322. dom.wrapper.classList.remove( classToBubble );
  2323. }
  2324. } );
  2325. }
  2326. // Allow the first background to apply without transition
  2327. setTimeout( function() {
  2328. dom.background.classList.remove( 'no-transition' );
  2329. }, 1 );
  2330. }
  2331. /**
  2332. * Updates the position of the parallax background based
  2333. * on the current slide index.
  2334. */
  2335. function updateParallax() {
  2336. if( config.parallaxBackgroundImage ) {
  2337. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2338. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2339. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2340. backgroundWidth, backgroundHeight;
  2341. if( backgroundSize.length === 1 ) {
  2342. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2343. }
  2344. else {
  2345. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2346. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2347. }
  2348. var slideWidth = dom.background.offsetWidth,
  2349. horizontalSlideCount = horizontalSlides.length,
  2350. horizontalOffsetMultiplier,
  2351. horizontalOffset;
  2352. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2353. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2354. }
  2355. else {
  2356. horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
  2357. }
  2358. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2359. var slideHeight = dom.background.offsetHeight,
  2360. verticalSlideCount = verticalSlides.length,
  2361. verticalOffsetMultiplier,
  2362. verticalOffset;
  2363. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2364. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2365. }
  2366. else {
  2367. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2368. }
  2369. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0;
  2370. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2371. }
  2372. }
  2373. /**
  2374. * Called when the given slide is within the configured view
  2375. * distance. Shows the slide element and loads any content
  2376. * that is set to load lazily (data-src).
  2377. *
  2378. * @param {HTMLElement} slide Slide to show
  2379. */
  2380. function showSlide( slide ) {
  2381. // Show the slide element
  2382. slide.style.display = config.display;
  2383. // Media elements with data-src attributes
  2384. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) {
  2385. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2386. element.removeAttribute( 'data-src' );
  2387. } );
  2388. // Media elements with <source> children
  2389. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2390. var sources = 0;
  2391. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2392. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2393. source.removeAttribute( 'data-src' );
  2394. sources += 1;
  2395. } );
  2396. // If we rewrote sources for this video/audio element, we need
  2397. // to manually tell it to load from its new origin
  2398. if( sources > 0 ) {
  2399. media.load();
  2400. }
  2401. } );
  2402. // Show the corresponding background element
  2403. var indices = getIndices( slide );
  2404. var background = getSlideBackground( indices.h, indices.v );
  2405. if( background ) {
  2406. background.style.display = 'block';
  2407. // If the background contains media, load it
  2408. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2409. background.setAttribute( 'data-loaded', 'true' );
  2410. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2411. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2412. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2413. backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ),
  2414. backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2415. // Images
  2416. if( backgroundImage ) {
  2417. background.style.backgroundImage = 'url('+ backgroundImage +')';
  2418. }
  2419. // Videos
  2420. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2421. var video = document.createElement( 'video' );
  2422. if( backgroundVideoLoop ) {
  2423. video.setAttribute( 'loop', '' );
  2424. }
  2425. if( backgroundVideoMuted ) {
  2426. video.muted = true;
  2427. }
  2428. // Support comma separated lists of video sources
  2429. backgroundVideo.split( ',' ).forEach( function( source ) {
  2430. video.innerHTML += '<source src="'+ source +'">';
  2431. } );
  2432. background.appendChild( video );
  2433. }
  2434. // Iframes
  2435. else if( backgroundIframe ) {
  2436. var iframe = document.createElement( 'iframe' );
  2437. iframe.setAttribute( 'allowfullscreen', '' );
  2438. iframe.setAttribute( 'mozallowfullscreen', '' );
  2439. iframe.setAttribute( 'webkitallowfullscreen', '' );
  2440. // Only load autoplaying content when the slide is shown to
  2441. // avoid having it play in the background
  2442. if( /autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
  2443. iframe.setAttribute( 'data-src', backgroundIframe );
  2444. }
  2445. else {
  2446. iframe.setAttribute( 'src', backgroundIframe );
  2447. }
  2448. iframe.style.width = '100%';
  2449. iframe.style.height = '100%';
  2450. iframe.style.maxHeight = '100%';
  2451. iframe.style.maxWidth = '100%';
  2452. background.appendChild( iframe );
  2453. }
  2454. }
  2455. }
  2456. }
  2457. /**
  2458. * Called when the given slide is moved outside of the
  2459. * configured view distance.
  2460. *
  2461. * @param {HTMLElement} slide
  2462. */
  2463. function hideSlide( slide ) {
  2464. // Hide the slide element
  2465. slide.style.display = 'none';
  2466. // Hide the corresponding background element
  2467. var indices = getIndices( slide );
  2468. var background = getSlideBackground( indices.h, indices.v );
  2469. if( background ) {
  2470. background.style.display = 'none';
  2471. }
  2472. }
  2473. /**
  2474. * Determine what available routes there are for navigation.
  2475. *
  2476. * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
  2477. */
  2478. function availableRoutes() {
  2479. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2480. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2481. var routes = {
  2482. left: indexh > 0 || config.loop,
  2483. right: indexh < horizontalSlides.length - 1 || config.loop,
  2484. up: indexv > 0,
  2485. down: indexv < verticalSlides.length - 1
  2486. };
  2487. // reverse horizontal controls for rtl
  2488. if( config.rtl ) {
  2489. var left = routes.left;
  2490. routes.left = routes.right;
  2491. routes.right = left;
  2492. }
  2493. return routes;
  2494. }
  2495. /**
  2496. * Returns an object describing the available fragment
  2497. * directions.
  2498. *
  2499. * @return {{prev: boolean, next: boolean}}
  2500. */
  2501. function availableFragments() {
  2502. if( currentSlide && config.fragments ) {
  2503. var fragments = currentSlide.querySelectorAll( '.fragment' );
  2504. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  2505. return {
  2506. prev: fragments.length - hiddenFragments.length > 0,
  2507. next: !!hiddenFragments.length
  2508. };
  2509. }
  2510. else {
  2511. return { prev: false, next: false };
  2512. }
  2513. }
  2514. /**
  2515. * Enforces origin-specific format rules for embedded media.
  2516. */
  2517. function formatEmbeddedContent() {
  2518. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  2519. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  2520. var src = el.getAttribute( sourceAttribute );
  2521. if( src && src.indexOf( param ) === -1 ) {
  2522. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  2523. }
  2524. });
  2525. };
  2526. // YouTube frames must include "?enablejsapi=1"
  2527. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  2528. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  2529. // Vimeo frames must include "?api=1"
  2530. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  2531. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  2532. }
  2533. /**
  2534. * Start playback of any embedded content inside of
  2535. * the given element.
  2536. *
  2537. * @param {HTMLElement} element
  2538. */
  2539. function startEmbeddedContent( element ) {
  2540. if( element && !isSpeakerNotes() ) {
  2541. // Restart GIFs
  2542. toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  2543. // Setting the same unchanged source like this was confirmed
  2544. // to work in Chrome, FF & Safari
  2545. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  2546. } );
  2547. // HTML5 media elements
  2548. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2549. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  2550. return;
  2551. }
  2552. // Prefer an explicit global autoplay setting
  2553. var autoplay = config.autoPlayMedia;
  2554. // If no global setting is available, fall back on the element's
  2555. // own autoplay setting
  2556. if( typeof autoplay !== 'boolean' ) {
  2557. autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
  2558. }
  2559. if( autoplay && typeof el.play === 'function' ) {
  2560. if( el.readyState > 1 ) {
  2561. startEmbeddedMedia( { target: el } );
  2562. }
  2563. else {
  2564. el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes
  2565. el.addEventListener( 'loadeddata', startEmbeddedMedia );
  2566. }
  2567. }
  2568. } );
  2569. // Normal iframes
  2570. toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  2571. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  2572. return;
  2573. }
  2574. startEmbeddedIframe( { target: el } );
  2575. } );
  2576. // Lazy loading iframes
  2577. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  2578. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  2579. return;
  2580. }
  2581. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  2582. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  2583. el.addEventListener( 'load', startEmbeddedIframe );
  2584. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  2585. }
  2586. } );
  2587. }
  2588. }
  2589. /**
  2590. * Starts playing an embedded video/audio element after
  2591. * it has finished loading.
  2592. *
  2593. * @param {object} event
  2594. */
  2595. function startEmbeddedMedia( event ) {
  2596. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  2597. isVisible = !!closestParent( event.target, '.present' );
  2598. if( isAttachedToDOM && isVisible ) {
  2599. event.target.currentTime = 0;
  2600. event.target.play();
  2601. }
  2602. event.target.removeEventListener( 'loadeddata', startEmbeddedMedia );
  2603. }
  2604. /**
  2605. * "Starts" the content of an embedded iframe using the
  2606. * postMessage API.
  2607. *
  2608. * @param {object} event
  2609. */
  2610. function startEmbeddedIframe( event ) {
  2611. var iframe = event.target;
  2612. if( iframe && iframe.contentWindow ) {
  2613. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  2614. isVisible = !!closestParent( event.target, '.present' );
  2615. if( isAttachedToDOM && isVisible ) {
  2616. // Prefer an explicit global autoplay setting
  2617. var autoplay = config.autoPlayMedia;
  2618. // If no global setting is available, fall back on the element's
  2619. // own autoplay setting
  2620. if( typeof autoplay !== 'boolean' ) {
  2621. autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
  2622. }
  2623. // YouTube postMessage API
  2624. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  2625. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  2626. }
  2627. // Vimeo postMessage API
  2628. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  2629. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  2630. }
  2631. // Generic postMessage API
  2632. else {
  2633. iframe.contentWindow.postMessage( 'slide:start', '*' );
  2634. }
  2635. }
  2636. }
  2637. }
  2638. /**
  2639. * Stop playback of any embedded content inside of
  2640. * the targeted slide.
  2641. *
  2642. * @param {HTMLElement} element
  2643. * @param {boolean} autoplay Optionally override the
  2644. * autoplay setting of media elements
  2645. */
  2646. function stopEmbeddedContent( element, autoplay ) {
  2647. if( element && element.parentNode ) {
  2648. // HTML5 media elements
  2649. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2650. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  2651. el.setAttribute('data-paused-by-reveal', '');
  2652. el.pause();
  2653. }
  2654. } );
  2655. // Generic postMessage API for non-lazy loaded iframes
  2656. toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  2657. if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
  2658. el.removeEventListener( 'load', startEmbeddedIframe );
  2659. });
  2660. // YouTube postMessage API
  2661. toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  2662. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  2663. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  2664. }
  2665. });
  2666. // Vimeo postMessage API
  2667. toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  2668. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  2669. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  2670. }
  2671. });
  2672. // Lazy loading iframes
  2673. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  2674. // Only removing the src doesn't actually unload the frame
  2675. // in all browsers (Firefox) so we set it to blank first
  2676. el.setAttribute( 'src', 'about:blank' );
  2677. el.removeAttribute( 'src' );
  2678. } );
  2679. }
  2680. }
  2681. /**
  2682. * Returns the number of past slides. This can be used as a global
  2683. * flattened index for slides.
  2684. *
  2685. * @return {number} Past slide count
  2686. */
  2687. function getSlidePastCount() {
  2688. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2689. // The number of past slides
  2690. var pastCount = 0;
  2691. // Step through all slides and count the past ones
  2692. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  2693. var horizontalSlide = horizontalSlides[i];
  2694. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2695. for( var j = 0; j < verticalSlides.length; j++ ) {
  2696. // Stop as soon as we arrive at the present
  2697. if( verticalSlides[j].classList.contains( 'present' ) ) {
  2698. break mainLoop;
  2699. }
  2700. pastCount++;
  2701. }
  2702. // Stop as soon as we arrive at the present
  2703. if( horizontalSlide.classList.contains( 'present' ) ) {
  2704. break;
  2705. }
  2706. // Don't count the wrapping section for vertical slides
  2707. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  2708. pastCount++;
  2709. }
  2710. }
  2711. return pastCount;
  2712. }
  2713. /**
  2714. * Returns a value ranging from 0-1 that represents
  2715. * how far into the presentation we have navigated.
  2716. *
  2717. * @return {number}
  2718. */
  2719. function getProgress() {
  2720. // The number of past and total slides
  2721. var totalCount = getTotalSlides();
  2722. var pastCount = getSlidePastCount();
  2723. if( currentSlide ) {
  2724. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  2725. // If there are fragments in the current slide those should be
  2726. // accounted for in the progress.
  2727. if( allFragments.length > 0 ) {
  2728. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  2729. // This value represents how big a portion of the slide progress
  2730. // that is made up by its fragments (0-1)
  2731. var fragmentWeight = 0.9;
  2732. // Add fragment progress to the past slide count
  2733. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  2734. }
  2735. }
  2736. return pastCount / ( totalCount - 1 );
  2737. }
  2738. /**
  2739. * Checks if this presentation is running inside of the
  2740. * speaker notes window.
  2741. *
  2742. * @return {boolean}
  2743. */
  2744. function isSpeakerNotes() {
  2745. return !!window.location.search.match( /receiver/gi );
  2746. }
  2747. /**
  2748. * Reads the current URL (hash) and navigates accordingly.
  2749. */
  2750. function readURL() {
  2751. var hash = window.location.hash;
  2752. // Attempt to parse the hash as either an index or name
  2753. var bits = hash.slice( 2 ).split( '/' ),
  2754. name = hash.replace( /#|\//gi, '' );
  2755. // If the first bit is invalid and there is a name we can
  2756. // assume that this is a named link
  2757. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  2758. var element;
  2759. // Ensure the named link is a valid HTML ID attribute
  2760. if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) {
  2761. // Find the slide with the specified ID
  2762. element = document.getElementById( name );
  2763. }
  2764. if( element ) {
  2765. // Find the position of the named slide and navigate to it
  2766. var indices = Reveal.getIndices( element );
  2767. slide( indices.h, indices.v );
  2768. }
  2769. // If the slide doesn't exist, navigate to the current slide
  2770. else {
  2771. slide( indexh || 0, indexv || 0 );
  2772. }
  2773. }
  2774. else {
  2775. // Read the index components of the hash
  2776. var h = parseInt( bits[0], 10 ) || 0,
  2777. v = parseInt( bits[1], 10 ) || 0;
  2778. if( h !== indexh || v !== indexv ) {
  2779. slide( h, v );
  2780. }
  2781. }
  2782. }
  2783. /**
  2784. * Updates the page URL (hash) to reflect the current
  2785. * state.
  2786. *
  2787. * @param {number} delay The time in ms to wait before
  2788. * writing the hash
  2789. */
  2790. function writeURL( delay ) {
  2791. if( config.history ) {
  2792. // Make sure there's never more than one timeout running
  2793. clearTimeout( writeURLTimeout );
  2794. // If a delay is specified, timeout this call
  2795. if( typeof delay === 'number' ) {
  2796. writeURLTimeout = setTimeout( writeURL, delay );
  2797. }
  2798. else if( currentSlide ) {
  2799. var url = '/';
  2800. // Attempt to create a named link based on the slide's ID
  2801. var id = currentSlide.getAttribute( 'id' );
  2802. if( id ) {
  2803. id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
  2804. }
  2805. // If the current slide has an ID, use that as a named link
  2806. if( typeof id === 'string' && id.length ) {
  2807. url = '/' + id;
  2808. }
  2809. // Otherwise use the /h/v index
  2810. else {
  2811. if( indexh > 0 || indexv > 0 ) url += indexh;
  2812. if( indexv > 0 ) url += '/' + indexv;
  2813. }
  2814. window.location.hash = url;
  2815. }
  2816. }
  2817. }
  2818. /**
  2819. * Retrieves the h/v location and fragment of the current,
  2820. * or specified, slide.
  2821. *
  2822. * @param {HTMLElement} [slide] If specified, the returned
  2823. * index will be for this slide rather than the currently
  2824. * active one
  2825. *
  2826. * @return {{h: number, v: number, f: number}}
  2827. */
  2828. function getIndices( slide ) {
  2829. // By default, return the current indices
  2830. var h = indexh,
  2831. v = indexv,
  2832. f;
  2833. // If a slide is specified, return the indices of that slide
  2834. if( slide ) {
  2835. var isVertical = isVerticalSlide( slide );
  2836. var slideh = isVertical ? slide.parentNode : slide;
  2837. // Select all horizontal slides
  2838. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2839. // Now that we know which the horizontal slide is, get its index
  2840. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  2841. // Assume we're not vertical
  2842. v = undefined;
  2843. // If this is a vertical slide, grab the vertical index
  2844. if( isVertical ) {
  2845. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  2846. }
  2847. }
  2848. if( !slide && currentSlide ) {
  2849. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  2850. if( hasFragments ) {
  2851. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2852. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  2853. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  2854. }
  2855. else {
  2856. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  2857. }
  2858. }
  2859. }
  2860. return { h: h, v: v, f: f };
  2861. }
  2862. /**
  2863. * Retrieves the total number of slides in this presentation.
  2864. *
  2865. * @return {number}
  2866. */
  2867. function getTotalSlides() {
  2868. return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  2869. }
  2870. /**
  2871. * Returns the slide element matching the specified index.
  2872. *
  2873. * @return {HTMLElement}
  2874. */
  2875. function getSlide( x, y ) {
  2876. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2877. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2878. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  2879. return verticalSlides ? verticalSlides[ y ] : undefined;
  2880. }
  2881. return horizontalSlide;
  2882. }
  2883. /**
  2884. * Returns the background element for the given slide.
  2885. * All slides, even the ones with no background properties
  2886. * defined, have a background element so as long as the
  2887. * index is valid an element will be returned.
  2888. *
  2889. * @param {number} x Horizontal background index
  2890. * @param {number} y Vertical background index
  2891. * @return {(HTMLElement[]|*)}
  2892. */
  2893. function getSlideBackground( x, y ) {
  2894. // When printing to PDF the slide backgrounds are nested
  2895. // inside of the slides
  2896. if( isPrintingPDF() ) {
  2897. var slide = getSlide( x, y );
  2898. if( slide ) {
  2899. return slide.slideBackgroundElement;
  2900. }
  2901. return undefined;
  2902. }
  2903. var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
  2904. var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
  2905. if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
  2906. return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
  2907. }
  2908. return horizontalBackground;
  2909. }
  2910. /**
  2911. * Retrieves the speaker notes from a slide. Notes can be
  2912. * defined in two ways:
  2913. * 1. As a data-notes attribute on the slide <section>
  2914. * 2. As an <aside class="notes"> inside of the slide
  2915. *
  2916. * @param {HTMLElement} [slide=currentSlide]
  2917. * @return {(string|null)}
  2918. */
  2919. function getSlideNotes( slide ) {
  2920. // Default to the current slide
  2921. slide = slide || currentSlide;
  2922. // Notes can be specified via the data-notes attribute...
  2923. if( slide.hasAttribute( 'data-notes' ) ) {
  2924. return slide.getAttribute( 'data-notes' );
  2925. }
  2926. // ... or using an <aside class="notes"> element
  2927. var notesElement = slide.querySelector( 'aside.notes' );
  2928. if( notesElement ) {
  2929. return notesElement.innerHTML;
  2930. }
  2931. return null;
  2932. }
  2933. /**
  2934. * Retrieves the current state of the presentation as
  2935. * an object. This state can then be restored at any
  2936. * time.
  2937. *
  2938. * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
  2939. */
  2940. function getState() {
  2941. var indices = getIndices();
  2942. return {
  2943. indexh: indices.h,
  2944. indexv: indices.v,
  2945. indexf: indices.f,
  2946. paused: isPaused(),
  2947. overview: isOverview()
  2948. };
  2949. }
  2950. /**
  2951. * Restores the presentation to the given state.
  2952. *
  2953. * @param {object} state As generated by getState()
  2954. * @see {@link getState} generates the parameter `state`
  2955. */
  2956. function setState( state ) {
  2957. if( typeof state === 'object' ) {
  2958. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  2959. var pausedFlag = deserialize( state.paused ),
  2960. overviewFlag = deserialize( state.overview );
  2961. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  2962. togglePause( pausedFlag );
  2963. }
  2964. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  2965. toggleOverview( overviewFlag );
  2966. }
  2967. }
  2968. }
  2969. /**
  2970. * Return a sorted fragments list, ordered by an increasing
  2971. * "data-fragment-index" attribute.
  2972. *
  2973. * Fragments will be revealed in the order that they are returned by
  2974. * this function, so you can use the index attributes to control the
  2975. * order of fragment appearance.
  2976. *
  2977. * To maintain a sensible default fragment order, fragments are presumed
  2978. * to be passed in document order. This function adds a "fragment-index"
  2979. * attribute to each node if such an attribute is not already present,
  2980. * and sets that attribute to an integer value which is the position of
  2981. * the fragment within the fragments list.
  2982. *
  2983. * @param {object[]|*} fragments
  2984. * @return {object[]} sorted Sorted array of fragments
  2985. */
  2986. function sortFragments( fragments ) {
  2987. fragments = toArray( fragments );
  2988. var ordered = [],
  2989. unordered = [],
  2990. sorted = [];
  2991. // Group ordered and unordered elements
  2992. fragments.forEach( function( fragment, i ) {
  2993. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  2994. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  2995. if( !ordered[index] ) {
  2996. ordered[index] = [];
  2997. }
  2998. ordered[index].push( fragment );
  2999. }
  3000. else {
  3001. unordered.push( [ fragment ] );
  3002. }
  3003. } );
  3004. // Append fragments without explicit indices in their
  3005. // DOM order
  3006. ordered = ordered.concat( unordered );
  3007. // Manually count the index up per group to ensure there
  3008. // are no gaps
  3009. var index = 0;
  3010. // Push all fragments in their sorted order to an array,
  3011. // this flattens the groups
  3012. ordered.forEach( function( group ) {
  3013. group.forEach( function( fragment ) {
  3014. sorted.push( fragment );
  3015. fragment.setAttribute( 'data-fragment-index', index );
  3016. } );
  3017. index ++;
  3018. } );
  3019. return sorted;
  3020. }
  3021. /**
  3022. * Navigate to the specified slide fragment.
  3023. *
  3024. * @param {?number} index The index of the fragment that
  3025. * should be shown, -1 means all are invisible
  3026. * @param {number} offset Integer offset to apply to the
  3027. * fragment index
  3028. *
  3029. * @return {boolean} true if a change was made in any
  3030. * fragments visibility as part of this call
  3031. */
  3032. function navigateFragment( index, offset ) {
  3033. if( currentSlide && config.fragments ) {
  3034. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3035. if( fragments.length ) {
  3036. // If no index is specified, find the current
  3037. if( typeof index !== 'number' ) {
  3038. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3039. if( lastVisibleFragment ) {
  3040. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3041. }
  3042. else {
  3043. index = -1;
  3044. }
  3045. }
  3046. // If an offset is specified, apply it to the index
  3047. if( typeof offset === 'number' ) {
  3048. index += offset;
  3049. }
  3050. var fragmentsShown = [],
  3051. fragmentsHidden = [];
  3052. toArray( fragments ).forEach( function( element, i ) {
  3053. if( element.hasAttribute( 'data-fragment-index' ) ) {
  3054. i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
  3055. }
  3056. // Visible fragments
  3057. if( i <= index ) {
  3058. if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
  3059. element.classList.add( 'visible' );
  3060. element.classList.remove( 'current-fragment' );
  3061. // Announce the fragments one by one to the Screen Reader
  3062. dom.statusDiv.textContent = getStatusText( element );
  3063. if( i === index ) {
  3064. element.classList.add( 'current-fragment' );
  3065. startEmbeddedContent( element );
  3066. }
  3067. }
  3068. // Hidden fragments
  3069. else {
  3070. if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
  3071. element.classList.remove( 'visible' );
  3072. element.classList.remove( 'current-fragment' );
  3073. }
  3074. } );
  3075. if( fragmentsHidden.length ) {
  3076. dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
  3077. }
  3078. if( fragmentsShown.length ) {
  3079. dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
  3080. }
  3081. updateControls();
  3082. updateProgress();
  3083. return !!( fragmentsShown.length || fragmentsHidden.length );
  3084. }
  3085. }
  3086. return false;
  3087. }
  3088. /**
  3089. * Navigate to the next slide fragment.
  3090. *
  3091. * @return {boolean} true if there was a next fragment,
  3092. * false otherwise
  3093. */
  3094. function nextFragment() {
  3095. return navigateFragment( null, 1 );
  3096. }
  3097. /**
  3098. * Navigate to the previous slide fragment.
  3099. *
  3100. * @return {boolean} true if there was a previous fragment,
  3101. * false otherwise
  3102. */
  3103. function previousFragment() {
  3104. return navigateFragment( null, -1 );
  3105. }
  3106. /**
  3107. * Cues a new automated slide if enabled in the config.
  3108. */
  3109. function cueAutoSlide() {
  3110. cancelAutoSlide();
  3111. if( currentSlide ) {
  3112. var fragment = currentSlide.querySelector( '.current-fragment' );
  3113. // When the slide first appears there is no "current" fragment so
  3114. // we look for a data-autoslide timing on the first fragment
  3115. if( !fragment ) fragment = currentSlide.querySelector( '.fragment' );
  3116. var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
  3117. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  3118. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  3119. // Pick value in the following priority order:
  3120. // 1. Current fragment's data-autoslide
  3121. // 2. Current slide's data-autoslide
  3122. // 3. Parent slide's data-autoslide
  3123. // 4. Global autoSlide setting
  3124. if( fragmentAutoSlide ) {
  3125. autoSlide = parseInt( fragmentAutoSlide, 10 );
  3126. }
  3127. else if( slideAutoSlide ) {
  3128. autoSlide = parseInt( slideAutoSlide, 10 );
  3129. }
  3130. else if( parentAutoSlide ) {
  3131. autoSlide = parseInt( parentAutoSlide, 10 );
  3132. }
  3133. else {
  3134. autoSlide = config.autoSlide;
  3135. }
  3136. // If there are media elements with data-autoplay,
  3137. // automatically set the autoSlide duration to the
  3138. // length of that media. Not applicable if the slide
  3139. // is divided up into fragments.
  3140. // playbackRate is accounted for in the duration.
  3141. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  3142. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3143. if( el.hasAttribute( 'data-autoplay' ) ) {
  3144. if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
  3145. autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
  3146. }
  3147. }
  3148. } );
  3149. }
  3150. // Cue the next auto-slide if:
  3151. // - There is an autoSlide value
  3152. // - Auto-sliding isn't paused by the user
  3153. // - The presentation isn't paused
  3154. // - The overview isn't active
  3155. // - The presentation isn't over
  3156. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  3157. autoSlideTimeout = setTimeout( function() {
  3158. typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
  3159. cueAutoSlide();
  3160. }, autoSlide );
  3161. autoSlideStartTime = Date.now();
  3162. }
  3163. if( autoSlidePlayer ) {
  3164. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  3165. }
  3166. }
  3167. }
  3168. /**
  3169. * Cancels any ongoing request to auto-slide.
  3170. */
  3171. function cancelAutoSlide() {
  3172. clearTimeout( autoSlideTimeout );
  3173. autoSlideTimeout = -1;
  3174. }
  3175. function pauseAutoSlide() {
  3176. if( autoSlide && !autoSlidePaused ) {
  3177. autoSlidePaused = true;
  3178. dispatchEvent( 'autoslidepaused' );
  3179. clearTimeout( autoSlideTimeout );
  3180. if( autoSlidePlayer ) {
  3181. autoSlidePlayer.setPlaying( false );
  3182. }
  3183. }
  3184. }
  3185. function resumeAutoSlide() {
  3186. if( autoSlide && autoSlidePaused ) {
  3187. autoSlidePaused = false;
  3188. dispatchEvent( 'autoslideresumed' );
  3189. cueAutoSlide();
  3190. }
  3191. }
  3192. function navigateLeft() {
  3193. // Reverse for RTL
  3194. if( config.rtl ) {
  3195. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  3196. slide( indexh + 1 );
  3197. }
  3198. }
  3199. // Normal navigation
  3200. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  3201. slide( indexh - 1 );
  3202. }
  3203. }
  3204. function navigateRight() {
  3205. // Reverse for RTL
  3206. if( config.rtl ) {
  3207. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  3208. slide( indexh - 1 );
  3209. }
  3210. }
  3211. // Normal navigation
  3212. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  3213. slide( indexh + 1 );
  3214. }
  3215. }
  3216. function navigateUp() {
  3217. // Prioritize hiding fragments
  3218. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  3219. slide( indexh, indexv - 1 );
  3220. }
  3221. }
  3222. function navigateDown() {
  3223. // Prioritize revealing fragments
  3224. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  3225. slide( indexh, indexv + 1 );
  3226. }
  3227. }
  3228. /**
  3229. * Navigates backwards, prioritized in the following order:
  3230. * 1) Previous fragment
  3231. * 2) Previous vertical slide
  3232. * 3) Previous horizontal slide
  3233. */
  3234. function navigatePrev() {
  3235. // Prioritize revealing fragments
  3236. if( previousFragment() === false ) {
  3237. if( availableRoutes().up ) {
  3238. navigateUp();
  3239. }
  3240. else {
  3241. // Fetch the previous horizontal slide, if there is one
  3242. var previousSlide;
  3243. if( config.rtl ) {
  3244. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  3245. }
  3246. else {
  3247. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  3248. }
  3249. if( previousSlide ) {
  3250. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  3251. var h = indexh - 1;
  3252. slide( h, v );
  3253. }
  3254. }
  3255. }
  3256. }
  3257. /**
  3258. * The reverse of #navigatePrev().
  3259. */
  3260. function navigateNext() {
  3261. // Prioritize revealing fragments
  3262. if( nextFragment() === false ) {
  3263. if( availableRoutes().down ) {
  3264. navigateDown();
  3265. }
  3266. else if( config.rtl ) {
  3267. navigateLeft();
  3268. }
  3269. else {
  3270. navigateRight();
  3271. }
  3272. }
  3273. }
  3274. /**
  3275. * Checks if the target element prevents the triggering of
  3276. * swipe navigation.
  3277. */
  3278. function isSwipePrevented( target ) {
  3279. while( target && typeof target.hasAttribute === 'function' ) {
  3280. if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
  3281. target = target.parentNode;
  3282. }
  3283. return false;
  3284. }
  3285. // --------------------------------------------------------------------//
  3286. // ----------------------------- EVENTS -------------------------------//
  3287. // --------------------------------------------------------------------//
  3288. /**
  3289. * Called by all event handlers that are based on user
  3290. * input.
  3291. *
  3292. * @param {object} [event]
  3293. */
  3294. function onUserInput( event ) {
  3295. if( config.autoSlideStoppable ) {
  3296. pauseAutoSlide();
  3297. }
  3298. }
  3299. /**
  3300. * Handler for the document level 'keypress' event.
  3301. *
  3302. * @param {object} event
  3303. */
  3304. function onDocumentKeyPress( event ) {
  3305. // Check if the pressed key is question mark
  3306. if( event.shiftKey && event.charCode === 63 ) {
  3307. toggleHelp();
  3308. }
  3309. }
  3310. /**
  3311. * Handler for the document level 'keydown' event.
  3312. *
  3313. * @param {object} event
  3314. */
  3315. function onDocumentKeyDown( event ) {
  3316. // If there's a condition specified and it returns false,
  3317. // ignore this event
  3318. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
  3319. return true;
  3320. }
  3321. // Remember if auto-sliding was paused so we can toggle it
  3322. var autoSlideWasPaused = autoSlidePaused;
  3323. onUserInput( event );
  3324. // Check if there's a focused element that could be using
  3325. // the keyboard
  3326. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  3327. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  3328. var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
  3329. // Disregard the event if there's a focused element or a
  3330. // keyboard modifier key is present
  3331. if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  3332. // While paused only allow resume keyboard events; 'b', 'v', '.'
  3333. var resumeKeyCodes = [66,86,190,191];
  3334. var key;
  3335. // Custom key bindings for togglePause should be able to resume
  3336. if( typeof config.keyboard === 'object' ) {
  3337. for( key in config.keyboard ) {
  3338. if( config.keyboard[key] === 'togglePause' ) {
  3339. resumeKeyCodes.push( parseInt( key, 10 ) );
  3340. }
  3341. }
  3342. }
  3343. if( isPaused() && resumeKeyCodes.indexOf( event.keyCode ) === -1 ) {
  3344. return false;
  3345. }
  3346. var triggered = false;
  3347. // 1. User defined key bindings
  3348. if( typeof config.keyboard === 'object' ) {
  3349. for( key in config.keyboard ) {
  3350. // Check if this binding matches the pressed key
  3351. if( parseInt( key, 10 ) === event.keyCode ) {
  3352. var value = config.keyboard[ key ];
  3353. // Callback function
  3354. if( typeof value === 'function' ) {
  3355. value.apply( null, [ event ] );
  3356. }
  3357. // String shortcuts to reveal.js API
  3358. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  3359. Reveal[ value ].call();
  3360. }
  3361. triggered = true;
  3362. }
  3363. }
  3364. }
  3365. // 2. System defined key bindings
  3366. if( triggered === false ) {
  3367. // Assume true and try to prove false
  3368. triggered = true;
  3369. switch( event.keyCode ) {
  3370. // p, page up
  3371. case 80: case 33: navigatePrev(); break;
  3372. // n, page down
  3373. case 78: case 34: navigateNext(); break;
  3374. // h, left
  3375. case 72: case 37: navigateLeft(); break;
  3376. // l, right
  3377. case 76: case 39: navigateRight(); break;
  3378. // k, up
  3379. case 75: case 38: navigateUp(); break;
  3380. // j, down
  3381. case 74: case 40: navigateDown(); break;
  3382. // home
  3383. case 36: slide( 0 ); break;
  3384. // end
  3385. case 35: slide( Number.MAX_VALUE ); break;
  3386. // space
  3387. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  3388. // return
  3389. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  3390. // two-spot, semicolon, b, v, period, Logitech presenter tools "black screen" button
  3391. case 58: case 59: case 66: case 86: case 190: case 191: togglePause(); break;
  3392. // f
  3393. case 70: enterFullscreen(); break;
  3394. // a
  3395. case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
  3396. default:
  3397. triggered = false;
  3398. }
  3399. }
  3400. // If the input resulted in a triggered action we should prevent
  3401. // the browsers default behavior
  3402. if( triggered ) {
  3403. event.preventDefault && event.preventDefault();
  3404. }
  3405. // ESC or O key
  3406. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  3407. if( dom.overlay ) {
  3408. closeOverlay();
  3409. }
  3410. else {
  3411. toggleOverview();
  3412. }
  3413. event.preventDefault && event.preventDefault();
  3414. }
  3415. // If auto-sliding is enabled we need to cue up
  3416. // another timeout
  3417. cueAutoSlide();
  3418. }
  3419. /**
  3420. * Handler for the 'touchstart' event, enables support for
  3421. * swipe and pinch gestures.
  3422. *
  3423. * @param {object} event
  3424. */
  3425. function onTouchStart( event ) {
  3426. if( isSwipePrevented( event.target ) ) return true;
  3427. touch.startX = event.touches[0].clientX;
  3428. touch.startY = event.touches[0].clientY;
  3429. touch.startCount = event.touches.length;
  3430. // If there's two touches we need to memorize the distance
  3431. // between those two points to detect pinching
  3432. if( event.touches.length === 2 && config.overview ) {
  3433. touch.startSpan = distanceBetween( {
  3434. x: event.touches[1].clientX,
  3435. y: event.touches[1].clientY
  3436. }, {
  3437. x: touch.startX,
  3438. y: touch.startY
  3439. } );
  3440. }
  3441. }
  3442. /**
  3443. * Handler for the 'touchmove' event.
  3444. *
  3445. * @param {object} event
  3446. */
  3447. function onTouchMove( event ) {
  3448. if( isSwipePrevented( event.target ) ) return true;
  3449. // Each touch should only trigger one action
  3450. if( !touch.captured ) {
  3451. onUserInput( event );
  3452. var currentX = event.touches[0].clientX;
  3453. var currentY = event.touches[0].clientY;
  3454. // If the touch started with two points and still has
  3455. // two active touches; test for the pinch gesture
  3456. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  3457. // The current distance in pixels between the two touch points
  3458. var currentSpan = distanceBetween( {
  3459. x: event.touches[1].clientX,
  3460. y: event.touches[1].clientY
  3461. }, {
  3462. x: touch.startX,
  3463. y: touch.startY
  3464. } );
  3465. // If the span is larger than the desire amount we've got
  3466. // ourselves a pinch
  3467. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  3468. touch.captured = true;
  3469. if( currentSpan < touch.startSpan ) {
  3470. activateOverview();
  3471. }
  3472. else {
  3473. deactivateOverview();
  3474. }
  3475. }
  3476. event.preventDefault();
  3477. }
  3478. // There was only one touch point, look for a swipe
  3479. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  3480. var deltaX = currentX - touch.startX,
  3481. deltaY = currentY - touch.startY;
  3482. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  3483. touch.captured = true;
  3484. navigateLeft();
  3485. }
  3486. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  3487. touch.captured = true;
  3488. navigateRight();
  3489. }
  3490. else if( deltaY > touch.threshold ) {
  3491. touch.captured = true;
  3492. navigateUp();
  3493. }
  3494. else if( deltaY < -touch.threshold ) {
  3495. touch.captured = true;
  3496. navigateDown();
  3497. }
  3498. // If we're embedded, only block touch events if they have
  3499. // triggered an action
  3500. if( config.embedded ) {
  3501. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  3502. event.preventDefault();
  3503. }
  3504. }
  3505. // Not embedded? Block them all to avoid needless tossing
  3506. // around of the viewport in iOS
  3507. else {
  3508. event.preventDefault();
  3509. }
  3510. }
  3511. }
  3512. // There's a bug with swiping on some Android devices unless
  3513. // the default action is always prevented
  3514. else if( UA.match( /android/gi ) ) {
  3515. event.preventDefault();
  3516. }
  3517. }
  3518. /**
  3519. * Handler for the 'touchend' event.
  3520. *
  3521. * @param {object} event
  3522. */
  3523. function onTouchEnd( event ) {
  3524. touch.captured = false;
  3525. }
  3526. /**
  3527. * Convert pointer down to touch start.
  3528. *
  3529. * @param {object} event
  3530. */
  3531. function onPointerDown( event ) {
  3532. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  3533. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  3534. onTouchStart( event );
  3535. }
  3536. }
  3537. /**
  3538. * Convert pointer move to touch move.
  3539. *
  3540. * @param {object} event
  3541. */
  3542. function onPointerMove( event ) {
  3543. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  3544. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  3545. onTouchMove( event );
  3546. }
  3547. }
  3548. /**
  3549. * Convert pointer up to touch end.
  3550. *
  3551. * @param {object} event
  3552. */
  3553. function onPointerUp( event ) {
  3554. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  3555. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  3556. onTouchEnd( event );
  3557. }
  3558. }
  3559. /**
  3560. * Handles mouse wheel scrolling, throttled to avoid skipping
  3561. * multiple slides.
  3562. *
  3563. * @param {object} event
  3564. */
  3565. function onDocumentMouseScroll( event ) {
  3566. if( Date.now() - lastMouseWheelStep > 600 ) {
  3567. lastMouseWheelStep = Date.now();
  3568. var delta = event.detail || -event.wheelDelta;
  3569. if( delta > 0 ) {
  3570. navigateNext();
  3571. }
  3572. else if( delta < 0 ) {
  3573. navigatePrev();
  3574. }
  3575. }
  3576. }
  3577. /**
  3578. * Clicking on the progress bar results in a navigation to the
  3579. * closest approximate horizontal slide using this equation:
  3580. *
  3581. * ( clickX / presentationWidth ) * numberOfSlides
  3582. *
  3583. * @param {object} event
  3584. */
  3585. function onProgressClicked( event ) {
  3586. onUserInput( event );
  3587. event.preventDefault();
  3588. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  3589. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  3590. if( config.rtl ) {
  3591. slideIndex = slidesTotal - slideIndex;
  3592. }
  3593. slide( slideIndex );
  3594. }
  3595. /**
  3596. * Event handler for navigation control buttons.
  3597. */
  3598. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  3599. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  3600. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  3601. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  3602. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  3603. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  3604. /**
  3605. * Handler for the window level 'hashchange' event.
  3606. *
  3607. * @param {object} [event]
  3608. */
  3609. function onWindowHashChange( event ) {
  3610. readURL();
  3611. }
  3612. /**
  3613. * Handler for the window level 'resize' event.
  3614. *
  3615. * @param {object} [event]
  3616. */
  3617. function onWindowResize( event ) {
  3618. layout();
  3619. }
  3620. /**
  3621. * Handle for the window level 'visibilitychange' event.
  3622. *
  3623. * @param {object} [event]
  3624. */
  3625. function onPageVisibilityChange( event ) {
  3626. var isHidden = document.webkitHidden ||
  3627. document.msHidden ||
  3628. document.hidden;
  3629. // If, after clicking a link or similar and we're coming back,
  3630. // focus the document.body to ensure we can use keyboard shortcuts
  3631. if( isHidden === false && document.activeElement !== document.body ) {
  3632. // Not all elements support .blur() - SVGs among them.
  3633. if( typeof document.activeElement.blur === 'function' ) {
  3634. document.activeElement.blur();
  3635. }
  3636. document.body.focus();
  3637. }
  3638. }
  3639. /**
  3640. * Invoked when a slide is and we're in the overview.
  3641. *
  3642. * @param {object} event
  3643. */
  3644. function onOverviewSlideClicked( event ) {
  3645. // TODO There's a bug here where the event listeners are not
  3646. // removed after deactivating the overview.
  3647. if( eventsAreBound && isOverview() ) {
  3648. event.preventDefault();
  3649. var element = event.target;
  3650. while( element && !element.nodeName.match( /section/gi ) ) {
  3651. element = element.parentNode;
  3652. }
  3653. if( element && !element.classList.contains( 'disabled' ) ) {
  3654. deactivateOverview();
  3655. if( element.nodeName.match( /section/gi ) ) {
  3656. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  3657. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  3658. slide( h, v );
  3659. }
  3660. }
  3661. }
  3662. }
  3663. /**
  3664. * Handles clicks on links that are set to preview in the
  3665. * iframe overlay.
  3666. *
  3667. * @param {object} event
  3668. */
  3669. function onPreviewLinkClicked( event ) {
  3670. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  3671. var url = event.currentTarget.getAttribute( 'href' );
  3672. if( url ) {
  3673. showPreview( url );
  3674. event.preventDefault();
  3675. }
  3676. }
  3677. }
  3678. /**
  3679. * Handles click on the auto-sliding controls element.
  3680. *
  3681. * @param {object} [event]
  3682. */
  3683. function onAutoSlidePlayerClick( event ) {
  3684. // Replay
  3685. if( Reveal.isLastSlide() && config.loop === false ) {
  3686. slide( 0, 0 );
  3687. resumeAutoSlide();
  3688. }
  3689. // Resume
  3690. else if( autoSlidePaused ) {
  3691. resumeAutoSlide();
  3692. }
  3693. // Pause
  3694. else {
  3695. pauseAutoSlide();
  3696. }
  3697. }
  3698. // --------------------------------------------------------------------//
  3699. // ------------------------ PLAYBACK COMPONENT ------------------------//
  3700. // --------------------------------------------------------------------//
  3701. /**
  3702. * Constructor for the playback component, which displays
  3703. * play/pause/progress controls.
  3704. *
  3705. * @param {HTMLElement} container The component will append
  3706. * itself to this
  3707. * @param {function} progressCheck A method which will be
  3708. * called frequently to get the current progress on a range
  3709. * of 0-1
  3710. */
  3711. function Playback( container, progressCheck ) {
  3712. // Cosmetics
  3713. this.diameter = 100;
  3714. this.diameter2 = this.diameter/2;
  3715. this.thickness = 6;
  3716. // Flags if we are currently playing
  3717. this.playing = false;
  3718. // Current progress on a 0-1 range
  3719. this.progress = 0;
  3720. // Used to loop the animation smoothly
  3721. this.progressOffset = 1;
  3722. this.container = container;
  3723. this.progressCheck = progressCheck;
  3724. this.canvas = document.createElement( 'canvas' );
  3725. this.canvas.className = 'playback';
  3726. this.canvas.width = this.diameter;
  3727. this.canvas.height = this.diameter;
  3728. this.canvas.style.width = this.diameter2 + 'px';
  3729. this.canvas.style.height = this.diameter2 + 'px';
  3730. this.context = this.canvas.getContext( '2d' );
  3731. this.container.appendChild( this.canvas );
  3732. this.render();
  3733. }
  3734. /**
  3735. * @param value
  3736. */
  3737. Playback.prototype.setPlaying = function( value ) {
  3738. var wasPlaying = this.playing;
  3739. this.playing = value;
  3740. // Start repainting if we weren't already
  3741. if( !wasPlaying && this.playing ) {
  3742. this.animate();
  3743. }
  3744. else {
  3745. this.render();
  3746. }
  3747. };
  3748. Playback.prototype.animate = function() {
  3749. var progressBefore = this.progress;
  3750. this.progress = this.progressCheck();
  3751. // When we loop, offset the progress so that it eases
  3752. // smoothly rather than immediately resetting
  3753. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  3754. this.progressOffset = this.progress;
  3755. }
  3756. this.render();
  3757. if( this.playing ) {
  3758. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  3759. }
  3760. };
  3761. /**
  3762. * Renders the current progress and playback state.
  3763. */
  3764. Playback.prototype.render = function() {
  3765. var progress = this.playing ? this.progress : 0,
  3766. radius = ( this.diameter2 ) - this.thickness,
  3767. x = this.diameter2,
  3768. y = this.diameter2,
  3769. iconSize = 28;
  3770. // Ease towards 1
  3771. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  3772. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  3773. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  3774. this.context.save();
  3775. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  3776. // Solid background color
  3777. this.context.beginPath();
  3778. this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
  3779. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  3780. this.context.fill();
  3781. // Draw progress track
  3782. this.context.beginPath();
  3783. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  3784. this.context.lineWidth = this.thickness;
  3785. this.context.strokeStyle = '#666';
  3786. this.context.stroke();
  3787. if( this.playing ) {
  3788. // Draw progress on top of track
  3789. this.context.beginPath();
  3790. this.context.arc( x, y, radius, startAngle, endAngle, false );
  3791. this.context.lineWidth = this.thickness;
  3792. this.context.strokeStyle = '#fff';
  3793. this.context.stroke();
  3794. }
  3795. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  3796. // Draw play/pause icons
  3797. if( this.playing ) {
  3798. this.context.fillStyle = '#fff';
  3799. this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
  3800. this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
  3801. }
  3802. else {
  3803. this.context.beginPath();
  3804. this.context.translate( 4, 0 );
  3805. this.context.moveTo( 0, 0 );
  3806. this.context.lineTo( iconSize - 4, iconSize / 2 );
  3807. this.context.lineTo( 0, iconSize );
  3808. this.context.fillStyle = '#fff';
  3809. this.context.fill();
  3810. }
  3811. this.context.restore();
  3812. };
  3813. Playback.prototype.on = function( type, listener ) {
  3814. this.canvas.addEventListener( type, listener, false );
  3815. };
  3816. Playback.prototype.off = function( type, listener ) {
  3817. this.canvas.removeEventListener( type, listener, false );
  3818. };
  3819. Playback.prototype.destroy = function() {
  3820. this.playing = false;
  3821. if( this.canvas.parentNode ) {
  3822. this.container.removeChild( this.canvas );
  3823. }
  3824. };
  3825. // --------------------------------------------------------------------//
  3826. // ------------------------------- API --------------------------------//
  3827. // --------------------------------------------------------------------//
  3828. Reveal = {
  3829. VERSION: VERSION,
  3830. initialize: initialize,
  3831. configure: configure,
  3832. sync: sync,
  3833. // Navigation methods
  3834. slide: slide,
  3835. left: navigateLeft,
  3836. right: navigateRight,
  3837. up: navigateUp,
  3838. down: navigateDown,
  3839. prev: navigatePrev,
  3840. next: navigateNext,
  3841. // Fragment methods
  3842. navigateFragment: navigateFragment,
  3843. prevFragment: previousFragment,
  3844. nextFragment: nextFragment,
  3845. // Deprecated aliases
  3846. navigateTo: slide,
  3847. navigateLeft: navigateLeft,
  3848. navigateRight: navigateRight,
  3849. navigateUp: navigateUp,
  3850. navigateDown: navigateDown,
  3851. navigatePrev: navigatePrev,
  3852. navigateNext: navigateNext,
  3853. // Forces an update in slide layout
  3854. layout: layout,
  3855. // Randomizes the order of slides
  3856. shuffle: shuffle,
  3857. // Returns an object with the available routes as booleans (left/right/top/bottom)
  3858. availableRoutes: availableRoutes,
  3859. // Returns an object with the available fragments as booleans (prev/next)
  3860. availableFragments: availableFragments,
  3861. // Toggles a help overlay with keyboard shortcuts
  3862. toggleHelp: toggleHelp,
  3863. // Toggles the overview mode on/off
  3864. toggleOverview: toggleOverview,
  3865. // Toggles the "black screen" mode on/off
  3866. togglePause: togglePause,
  3867. // Toggles the auto slide mode on/off
  3868. toggleAutoSlide: toggleAutoSlide,
  3869. // State checks
  3870. isOverview: isOverview,
  3871. isPaused: isPaused,
  3872. isAutoSliding: isAutoSliding,
  3873. // Adds or removes all internal event listeners (such as keyboard)
  3874. addEventListeners: addEventListeners,
  3875. removeEventListeners: removeEventListeners,
  3876. // Facility for persisting and restoring the presentation state
  3877. getState: getState,
  3878. setState: setState,
  3879. // Presentation progress on range of 0-1
  3880. getProgress: getProgress,
  3881. // Returns the indices of the current, or specified, slide
  3882. getIndices: getIndices,
  3883. getTotalSlides: getTotalSlides,
  3884. // Returns the slide element at the specified index
  3885. getSlide: getSlide,
  3886. // Returns the slide background element at the specified index
  3887. getSlideBackground: getSlideBackground,
  3888. // Returns the speaker notes string for a slide, or null
  3889. getSlideNotes: getSlideNotes,
  3890. // Returns the previous slide element, may be null
  3891. getPreviousSlide: function() {
  3892. return previousSlide;
  3893. },
  3894. // Returns the current slide element
  3895. getCurrentSlide: function() {
  3896. return currentSlide;
  3897. },
  3898. // Returns the current scale of the presentation content
  3899. getScale: function() {
  3900. return scale;
  3901. },
  3902. // Returns the current configuration object
  3903. getConfig: function() {
  3904. return config;
  3905. },
  3906. // Helper method, retrieves query string as a key/value hash
  3907. getQueryHash: function() {
  3908. var query = {};
  3909. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  3910. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  3911. } );
  3912. // Basic deserialization
  3913. for( var i in query ) {
  3914. var value = query[ i ];
  3915. query[ i ] = deserialize( unescape( value ) );
  3916. }
  3917. return query;
  3918. },
  3919. // Returns true if we're currently on the first slide
  3920. isFirstSlide: function() {
  3921. return ( indexh === 0 && indexv === 0 );
  3922. },
  3923. // Returns true if we're currently on the last slide
  3924. isLastSlide: function() {
  3925. if( currentSlide ) {
  3926. // Does this slide has next a sibling?
  3927. if( currentSlide.nextElementSibling ) return false;
  3928. // If it's vertical, does its parent have a next sibling?
  3929. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  3930. return true;
  3931. }
  3932. return false;
  3933. },
  3934. // Checks if reveal.js has been loaded and is ready for use
  3935. isReady: function() {
  3936. return loaded;
  3937. },
  3938. // Forward event binding to the reveal DOM element
  3939. addEventListener: function( type, listener, useCapture ) {
  3940. if( 'addEventListener' in window ) {
  3941. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  3942. }
  3943. },
  3944. removeEventListener: function( type, listener, useCapture ) {
  3945. if( 'addEventListener' in window ) {
  3946. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  3947. }
  3948. },
  3949. // Programatically triggers a keyboard event
  3950. triggerKey: function( keyCode ) {
  3951. onDocumentKeyDown( { keyCode: keyCode } );
  3952. },
  3953. // Registers a new shortcut to include in the help overlay
  3954. registerKeyboardShortcut: function( key, value ) {
  3955. keyboardShortcuts[key] = value;
  3956. }
  3957. };
  3958. return Reveal;
  3959. }));