reveal.js 124 KB

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  1. /*!
  2. * reveal.js
  3. * http://lab.hakim.se/reveal-js
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2015 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. var SLIDES_SELECTOR = '.slides section',
  26. HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
  27. VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
  28. HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
  29. // Configuration defaults, can be overridden at initialization time
  30. config = {
  31. // The "normal" size of the presentation, aspect ratio will be preserved
  32. // when the presentation is scaled to fit different resolutions
  33. width: 960,
  34. height: 700,
  35. // Factor of the display size that should remain empty around the content
  36. margin: 0.1,
  37. // Bounds for smallest/largest possible scale to apply to content
  38. minScale: 0.2,
  39. maxScale: 1.5,
  40. // Display controls in the bottom right corner
  41. controls: true,
  42. // Display a presentation progress bar
  43. progress: true,
  44. // Display the page number of the current slide
  45. slideNumber: false,
  46. // Push each slide change to the browser history
  47. history: false,
  48. // Enable keyboard shortcuts for navigation
  49. keyboard: true,
  50. // Optional function that blocks keyboard events when retuning false
  51. keyboardCondition: null,
  52. // Enable the slide overview mode
  53. overview: true,
  54. // Vertical centering of slides
  55. center: true,
  56. // Enables touch navigation on devices with touch input
  57. touch: true,
  58. // Loop the presentation
  59. loop: false,
  60. // Change the presentation direction to be RTL
  61. rtl: false,
  62. // Turns fragments on and off globally
  63. fragments: true,
  64. // Flags if the presentation is running in an embedded mode,
  65. // i.e. contained within a limited portion of the screen
  66. embedded: false,
  67. // Flags if we should show a help overlay when the questionmark
  68. // key is pressed
  69. help: true,
  70. // Flags if it should be possible to pause the presentation (blackout)
  71. pause: true,
  72. // Flags if speaker notes should be visible to all viewers
  73. showNotes: false,
  74. // Number of milliseconds between automatically proceeding to the
  75. // next slide, disabled when set to 0, this value can be overwritten
  76. // by using a data-autoslide attribute on your slides
  77. autoSlide: 0,
  78. // Stop auto-sliding after user input
  79. autoSlideStoppable: true,
  80. // Enable slide navigation via mouse wheel
  81. mouseWheel: false,
  82. // Apply a 3D roll to links on hover
  83. rollingLinks: false,
  84. // Hides the address bar on mobile devices
  85. hideAddressBar: true,
  86. // Opens links in an iframe preview overlay
  87. previewLinks: false,
  88. // Exposes the reveal.js API through window.postMessage
  89. postMessage: true,
  90. // Dispatches all reveal.js events to the parent window through postMessage
  91. postMessageEvents: false,
  92. // Focuses body when page changes visiblity to ensure keyboard shortcuts work
  93. focusBodyOnPageVisibilityChange: true,
  94. // Transition style
  95. transition: 'slide', // none/fade/slide/convex/concave/zoom
  96. // Transition speed
  97. transitionSpeed: 'default', // default/fast/slow
  98. // Transition style for full page slide backgrounds
  99. backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
  100. // Parallax background image
  101. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  102. // Parallax background size
  103. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  104. // Amount of pixels to move the parallax background per slide step
  105. parallaxBackgroundHorizontal: null,
  106. parallaxBackgroundVertical: null,
  107. // Number of slides away from the current that are visible
  108. viewDistance: 3,
  109. // Script dependencies to load
  110. dependencies: []
  111. },
  112. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  113. loaded = false,
  114. // Flags if the overview mode is currently active
  115. overview = false,
  116. // The horizontal and vertical index of the currently active slide
  117. indexh,
  118. indexv,
  119. // The previous and current slide HTML elements
  120. previousSlide,
  121. currentSlide,
  122. previousBackground,
  123. // Slides may hold a data-state attribute which we pick up and apply
  124. // as a class to the body. This list contains the combined state of
  125. // all current slides.
  126. state = [],
  127. // The current scale of the presentation (see width/height config)
  128. scale = 1,
  129. // CSS transform that is currently applied to the slides container,
  130. // split into two groups
  131. slidesTransform = { layout: '', overview: '' },
  132. // Cached references to DOM elements
  133. dom = {},
  134. // Features supported by the browser, see #checkCapabilities()
  135. features = {},
  136. // Client is a mobile device, see #checkCapabilities()
  137. isMobileDevice,
  138. // Throttles mouse wheel navigation
  139. lastMouseWheelStep = 0,
  140. // Delays updates to the URL due to a Chrome thumbnailer bug
  141. writeURLTimeout = 0,
  142. // Flags if the interaction event listeners are bound
  143. eventsAreBound = false,
  144. // The current auto-slide duration
  145. autoSlide = 0,
  146. // Auto slide properties
  147. autoSlidePlayer,
  148. autoSlideTimeout = 0,
  149. autoSlideStartTime = -1,
  150. autoSlidePaused = false,
  151. // Holds information about the currently ongoing touch input
  152. touch = {
  153. startX: 0,
  154. startY: 0,
  155. startSpan: 0,
  156. startCount: 0,
  157. captured: false,
  158. threshold: 40
  159. },
  160. // Holds information about the keyboard shortcuts
  161. keyboardShortcuts = {
  162. 'N , SPACE': 'Next slide',
  163. 'P': 'Previous slide',
  164. '← , H': 'Navigate left',
  165. '→ , L': 'Navigate right',
  166. '↑ , K': 'Navigate up',
  167. '↓ , J': 'Navigate down',
  168. 'Home': 'First slide',
  169. 'End': 'Last slide',
  170. 'B , .': 'Pause',
  171. 'F': 'Fullscreen',
  172. 'ESC, O': 'Slide overview'
  173. };
  174. /**
  175. * Starts up the presentation if the client is capable.
  176. */
  177. function initialize( options ) {
  178. checkCapabilities();
  179. if( !features.transforms2d && !features.transforms3d ) {
  180. document.body.setAttribute( 'class', 'no-transforms' );
  181. // Since JS won't be running any further, we load all lazy
  182. // loading elements upfront
  183. var images = toArray( document.getElementsByTagName( 'img' ) ),
  184. iframes = toArray( document.getElementsByTagName( 'iframe' ) );
  185. var lazyLoadable = images.concat( iframes );
  186. for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
  187. var element = lazyLoadable[i];
  188. if( element.getAttribute( 'data-src' ) ) {
  189. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  190. element.removeAttribute( 'data-src' );
  191. }
  192. }
  193. // If the browser doesn't support core features we won't be
  194. // using JavaScript to control the presentation
  195. return;
  196. }
  197. // Cache references to key DOM elements
  198. dom.wrapper = document.querySelector( '.reveal' );
  199. dom.slides = document.querySelector( '.reveal .slides' );
  200. // Force a layout when the whole page, incl fonts, has loaded
  201. window.addEventListener( 'load', layout, false );
  202. var query = Reveal.getQueryHash();
  203. // Do not accept new dependencies via query config to avoid
  204. // the potential of malicious script injection
  205. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  206. // Copy options over to our config object
  207. extend( config, options );
  208. extend( config, query );
  209. // Hide the address bar in mobile browsers
  210. hideAddressBar();
  211. // Loads the dependencies and continues to #start() once done
  212. load();
  213. }
  214. /**
  215. * Inspect the client to see what it's capable of, this
  216. * should only happens once per runtime.
  217. */
  218. function checkCapabilities() {
  219. features.transforms3d = 'WebkitPerspective' in document.body.style ||
  220. 'MozPerspective' in document.body.style ||
  221. 'msPerspective' in document.body.style ||
  222. 'OPerspective' in document.body.style ||
  223. 'perspective' in document.body.style;
  224. features.transforms2d = 'WebkitTransform' in document.body.style ||
  225. 'MozTransform' in document.body.style ||
  226. 'msTransform' in document.body.style ||
  227. 'OTransform' in document.body.style ||
  228. 'transform' in document.body.style;
  229. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  230. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  231. features.canvas = !!document.createElement( 'canvas' ).getContext;
  232. features.touch = !!( 'ontouchstart' in window );
  233. // Transitions in the overview are disabled in desktop and
  234. // mobile Safari due to lag
  235. features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( navigator.userAgent );
  236. isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( navigator.userAgent );
  237. }
  238. /**
  239. * Loads the dependencies of reveal.js. Dependencies are
  240. * defined via the configuration option 'dependencies'
  241. * and will be loaded prior to starting/binding reveal.js.
  242. * Some dependencies may have an 'async' flag, if so they
  243. * will load after reveal.js has been started up.
  244. */
  245. function load() {
  246. var scripts = [],
  247. scriptsAsync = [],
  248. scriptsToPreload = 0;
  249. // Called once synchronous scripts finish loading
  250. function proceed() {
  251. if( scriptsAsync.length ) {
  252. // Load asynchronous scripts
  253. head.js.apply( null, scriptsAsync );
  254. }
  255. start();
  256. }
  257. function loadScript( s ) {
  258. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
  259. // Extension may contain callback functions
  260. if( typeof s.callback === 'function' ) {
  261. s.callback.apply( this );
  262. }
  263. if( --scriptsToPreload === 0 ) {
  264. proceed();
  265. }
  266. });
  267. }
  268. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  269. var s = config.dependencies[i];
  270. // Load if there's no condition or the condition is truthy
  271. if( !s.condition || s.condition() ) {
  272. if( s.async ) {
  273. scriptsAsync.push( s.src );
  274. }
  275. else {
  276. scripts.push( s.src );
  277. }
  278. loadScript( s );
  279. }
  280. }
  281. if( scripts.length ) {
  282. scriptsToPreload = scripts.length;
  283. // Load synchronous scripts
  284. head.js.apply( null, scripts );
  285. }
  286. else {
  287. proceed();
  288. }
  289. }
  290. /**
  291. * Starts up reveal.js by binding input events and navigating
  292. * to the current URL deeplink if there is one.
  293. */
  294. function start() {
  295. // Make sure we've got all the DOM elements we need
  296. setupDOM();
  297. // Listen to messages posted to this window
  298. setupPostMessage();
  299. // Prevent iframes from scrolling the slides out of view
  300. setupIframeScrollPrevention();
  301. // Resets all vertical slides so that only the first is visible
  302. resetVerticalSlides();
  303. // Updates the presentation to match the current configuration values
  304. configure();
  305. // Read the initial hash
  306. readURL();
  307. // Update all backgrounds
  308. updateBackground( true );
  309. // Notify listeners that the presentation is ready but use a 1ms
  310. // timeout to ensure it's not fired synchronously after #initialize()
  311. setTimeout( function() {
  312. // Enable transitions now that we're loaded
  313. dom.slides.classList.remove( 'no-transition' );
  314. loaded = true;
  315. dispatchEvent( 'ready', {
  316. 'indexh': indexh,
  317. 'indexv': indexv,
  318. 'currentSlide': currentSlide
  319. } );
  320. }, 1 );
  321. // Special setup and config is required when printing to PDF
  322. if( isPrintingPDF() ) {
  323. removeEventListeners();
  324. // The document needs to have loaded for the PDF layout
  325. // measurements to be accurate
  326. if( document.readyState === 'complete' ) {
  327. setupPDF();
  328. }
  329. else {
  330. window.addEventListener( 'load', setupPDF );
  331. }
  332. }
  333. }
  334. /**
  335. * Finds and stores references to DOM elements which are
  336. * required by the presentation. If a required element is
  337. * not found, it is created.
  338. */
  339. function setupDOM() {
  340. // Prevent transitions while we're loading
  341. dom.slides.classList.add( 'no-transition' );
  342. // Background element
  343. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  344. // Progress bar
  345. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  346. dom.progressbar = dom.progress.querySelector( 'span' );
  347. // Arrow controls
  348. createSingletonNode( dom.wrapper, 'aside', 'controls',
  349. '<button class="navigate-left" aria-label="previous slide"></button>' +
  350. '<button class="navigate-right" aria-label="next slide"></button>' +
  351. '<button class="navigate-up" aria-label="above slide"></button>' +
  352. '<button class="navigate-down" aria-label="below slide"></button>' );
  353. // Slide number
  354. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  355. // Element containing notes that are visible to the audience
  356. dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
  357. // Overlay graphic which is displayed during the paused mode
  358. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  359. // Cache references to elements
  360. dom.controls = document.querySelector( '.reveal .controls' );
  361. dom.theme = document.querySelector( '#theme' );
  362. dom.wrapper.setAttribute( 'role', 'application' );
  363. // There can be multiple instances of controls throughout the page
  364. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  365. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  366. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  367. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  368. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  369. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  370. dom.statusDiv = createStatusDiv();
  371. }
  372. /**
  373. * Creates a hidden div with role aria-live to announce the
  374. * current slide content. Hide the div off-screen to make it
  375. * available only to Assistive Technologies.
  376. */
  377. function createStatusDiv() {
  378. var statusDiv = document.getElementById( 'aria-status-div' );
  379. if( !statusDiv ) {
  380. statusDiv = document.createElement( 'div' );
  381. statusDiv.style.position = 'absolute';
  382. statusDiv.style.height = '1px';
  383. statusDiv.style.width = '1px';
  384. statusDiv.style.overflow ='hidden';
  385. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  386. statusDiv.setAttribute( 'id', 'aria-status-div' );
  387. statusDiv.setAttribute( 'aria-live', 'polite' );
  388. statusDiv.setAttribute( 'aria-atomic','true' );
  389. dom.wrapper.appendChild( statusDiv );
  390. }
  391. return statusDiv;
  392. }
  393. /**
  394. * Configures the presentation for printing to a static
  395. * PDF.
  396. */
  397. function setupPDF() {
  398. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  399. // Dimensions of the PDF pages
  400. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  401. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  402. // Dimensions of slides within the pages
  403. var slideWidth = slideSize.width,
  404. slideHeight = slideSize.height;
  405. // Let the browser know what page size we want to print
  406. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' );
  407. // Limit the size of certain elements to the dimensions of the slide
  408. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  409. document.body.classList.add( 'print-pdf' );
  410. document.body.style.width = pageWidth + 'px';
  411. document.body.style.height = pageHeight + 'px';
  412. // Slide and slide background layout
  413. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  414. // Vertical stacks are not centred since their section
  415. // children will be
  416. if( slide.classList.contains( 'stack' ) === false ) {
  417. // Center the slide inside of the page, giving the slide some margin
  418. var left = ( pageWidth - slideWidth ) / 2,
  419. top = ( pageHeight - slideHeight ) / 2;
  420. var contentHeight = getAbsoluteHeight( slide );
  421. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  422. // Center slides vertically
  423. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  424. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  425. }
  426. // Position the slide inside of the page
  427. slide.style.left = left + 'px';
  428. slide.style.top = top + 'px';
  429. slide.style.width = slideWidth + 'px';
  430. // TODO Backgrounds need to be multiplied when the slide
  431. // stretches over multiple pages
  432. var background = slide.querySelector( '.slide-background' );
  433. if( background ) {
  434. background.style.width = pageWidth + 'px';
  435. background.style.height = ( pageHeight * numberOfPages ) + 'px';
  436. background.style.top = -top + 'px';
  437. background.style.left = -left + 'px';
  438. }
  439. // If we're configured to `showNotes`, inject them into each slide
  440. if( config.showNotes ) {
  441. var notes = getSlideNotes( slide );
  442. if( notes ) {
  443. var notesElement = document.createElement( 'div' );
  444. notesElement.classList.add( 'speaker-notes' );
  445. notesElement.innerHTML = notes;
  446. notesElement.style.bottom = 40 - ( ( pageHeight - contentHeight ) / 2 ) + 'px';
  447. slide.appendChild( notesElement );
  448. }
  449. }
  450. }
  451. } );
  452. // Show all fragments
  453. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
  454. fragment.classList.add( 'visible' );
  455. } );
  456. }
  457. /**
  458. * This is an unfortunate necessity. Iframes can trigger the
  459. * parent window to scroll, for example by focusing an input.
  460. * This scrolling can not be prevented by hiding overflow in
  461. * CSS so we have to resort to repeatedly checking if the
  462. * browser has decided to offset our slides :(
  463. */
  464. function setupIframeScrollPrevention() {
  465. if( dom.slides.querySelector( 'iframe' ) ) {
  466. setInterval( function() {
  467. if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
  468. dom.wrapper.scrollTop = 0;
  469. dom.wrapper.scrollLeft = 0;
  470. }
  471. }, 500 );
  472. }
  473. }
  474. /**
  475. * Creates an HTML element and returns a reference to it.
  476. * If the element already exists the existing instance will
  477. * be returned.
  478. */
  479. function createSingletonNode( container, tagname, classname, innerHTML ) {
  480. // Find all nodes matching the description
  481. var nodes = container.querySelectorAll( '.' + classname );
  482. // Check all matches to find one which is a direct child of
  483. // the specified container
  484. for( var i = 0; i < nodes.length; i++ ) {
  485. var testNode = nodes[i];
  486. if( testNode.parentNode === container ) {
  487. return testNode;
  488. }
  489. }
  490. // If no node was found, create it now
  491. var node = document.createElement( tagname );
  492. node.classList.add( classname );
  493. if( typeof innerHTML === 'string' ) {
  494. node.innerHTML = innerHTML;
  495. }
  496. container.appendChild( node );
  497. return node;
  498. }
  499. /**
  500. * Creates the slide background elements and appends them
  501. * to the background container. One element is created per
  502. * slide no matter if the given slide has visible background.
  503. */
  504. function createBackgrounds() {
  505. var printMode = isPrintingPDF();
  506. // Clear prior backgrounds
  507. dom.background.innerHTML = '';
  508. dom.background.classList.add( 'no-transition' );
  509. // Iterate over all horizontal slides
  510. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  511. var backgroundStack;
  512. if( printMode ) {
  513. backgroundStack = createBackground( slideh, slideh );
  514. }
  515. else {
  516. backgroundStack = createBackground( slideh, dom.background );
  517. }
  518. // Iterate over all vertical slides
  519. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  520. if( printMode ) {
  521. createBackground( slidev, slidev );
  522. }
  523. else {
  524. createBackground( slidev, backgroundStack );
  525. }
  526. backgroundStack.classList.add( 'stack' );
  527. } );
  528. } );
  529. // Add parallax background if specified
  530. if( config.parallaxBackgroundImage ) {
  531. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  532. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  533. // Make sure the below properties are set on the element - these properties are
  534. // needed for proper transitions to be set on the element via CSS. To remove
  535. // annoying background slide-in effect when the presentation starts, apply
  536. // these properties after short time delay
  537. setTimeout( function() {
  538. dom.wrapper.classList.add( 'has-parallax-background' );
  539. }, 1 );
  540. }
  541. else {
  542. dom.background.style.backgroundImage = '';
  543. dom.wrapper.classList.remove( 'has-parallax-background' );
  544. }
  545. }
  546. /**
  547. * Creates a background for the given slide.
  548. *
  549. * @param {HTMLElement} slide
  550. * @param {HTMLElement} container The element that the background
  551. * should be appended to
  552. */
  553. function createBackground( slide, container ) {
  554. var data = {
  555. background: slide.getAttribute( 'data-background' ),
  556. backgroundSize: slide.getAttribute( 'data-background-size' ),
  557. backgroundImage: slide.getAttribute( 'data-background-image' ),
  558. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  559. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  560. backgroundColor: slide.getAttribute( 'data-background-color' ),
  561. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  562. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  563. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  564. };
  565. var element = document.createElement( 'div' );
  566. // Carry over custom classes from the slide to the background
  567. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  568. if( data.background ) {
  569. // Auto-wrap image urls in url(...)
  570. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
  571. slide.setAttribute( 'data-background-image', data.background );
  572. }
  573. else {
  574. element.style.background = data.background;
  575. }
  576. }
  577. // Create a hash for this combination of background settings.
  578. // This is used to determine when two slide backgrounds are
  579. // the same.
  580. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  581. element.setAttribute( 'data-background-hash', data.background +
  582. data.backgroundSize +
  583. data.backgroundImage +
  584. data.backgroundVideo +
  585. data.backgroundIframe +
  586. data.backgroundColor +
  587. data.backgroundRepeat +
  588. data.backgroundPosition +
  589. data.backgroundTransition );
  590. }
  591. // Additional and optional background properties
  592. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  593. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  594. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  595. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  596. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  597. container.appendChild( element );
  598. // If backgrounds are being recreated, clear old classes
  599. slide.classList.remove( 'has-dark-background' );
  600. slide.classList.remove( 'has-light-background' );
  601. // If this slide has a background color, add a class that
  602. // signals if it is light or dark. If the slide has no background
  603. // color, no class will be set
  604. var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor;
  605. if( computedBackgroundColor ) {
  606. var rgb = colorToRgb( computedBackgroundColor );
  607. // Ignore fully transparent backgrounds. Some browsers return
  608. // rgba(0,0,0,0) when reading the computed background color of
  609. // an element with no background
  610. if( rgb && rgb.a !== 0 ) {
  611. if( colorBrightness( computedBackgroundColor ) < 128 ) {
  612. slide.classList.add( 'has-dark-background' );
  613. }
  614. else {
  615. slide.classList.add( 'has-light-background' );
  616. }
  617. }
  618. }
  619. return element;
  620. }
  621. /**
  622. * Registers a listener to postMessage events, this makes it
  623. * possible to call all reveal.js API methods from another
  624. * window. For example:
  625. *
  626. * revealWindow.postMessage( JSON.stringify({
  627. * method: 'slide',
  628. * args: [ 2 ]
  629. * }), '*' );
  630. */
  631. function setupPostMessage() {
  632. if( config.postMessage ) {
  633. window.addEventListener( 'message', function ( event ) {
  634. var data = event.data;
  635. // Make sure we're dealing with JSON
  636. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  637. data = JSON.parse( data );
  638. // Check if the requested method can be found
  639. if( data.method && typeof Reveal[data.method] === 'function' ) {
  640. Reveal[data.method].apply( Reveal, data.args );
  641. }
  642. }
  643. }, false );
  644. }
  645. }
  646. /**
  647. * Applies the configuration settings from the config
  648. * object. May be called multiple times.
  649. */
  650. function configure( options ) {
  651. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  652. dom.wrapper.classList.remove( config.transition );
  653. // New config options may be passed when this method
  654. // is invoked through the API after initialization
  655. if( typeof options === 'object' ) extend( config, options );
  656. // Force linear transition based on browser capabilities
  657. if( features.transforms3d === false ) config.transition = 'linear';
  658. dom.wrapper.classList.add( config.transition );
  659. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  660. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  661. dom.controls.style.display = config.controls ? 'block' : 'none';
  662. dom.progress.style.display = config.progress ? 'block' : 'none';
  663. if( config.rtl ) {
  664. dom.wrapper.classList.add( 'rtl' );
  665. }
  666. else {
  667. dom.wrapper.classList.remove( 'rtl' );
  668. }
  669. if( config.center ) {
  670. dom.wrapper.classList.add( 'center' );
  671. }
  672. else {
  673. dom.wrapper.classList.remove( 'center' );
  674. }
  675. // Exit the paused mode if it was configured off
  676. if( config.pause === false ) {
  677. resume();
  678. }
  679. if( config.showNotes ) {
  680. dom.speakerNotes.classList.add( 'visible' );
  681. }
  682. else {
  683. dom.speakerNotes.classList.remove( 'visible' );
  684. }
  685. if( config.mouseWheel ) {
  686. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  687. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  688. }
  689. else {
  690. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  691. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  692. }
  693. // Rolling 3D links
  694. if( config.rollingLinks ) {
  695. enableRollingLinks();
  696. }
  697. else {
  698. disableRollingLinks();
  699. }
  700. // Iframe link previews
  701. if( config.previewLinks ) {
  702. enablePreviewLinks();
  703. }
  704. else {
  705. disablePreviewLinks();
  706. enablePreviewLinks( '[data-preview-link]' );
  707. }
  708. // Remove existing auto-slide controls
  709. if( autoSlidePlayer ) {
  710. autoSlidePlayer.destroy();
  711. autoSlidePlayer = null;
  712. }
  713. // Generate auto-slide controls if needed
  714. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  715. autoSlidePlayer = new Playback( dom.wrapper, function() {
  716. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  717. } );
  718. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  719. autoSlidePaused = false;
  720. }
  721. // When fragments are turned off they should be visible
  722. if( config.fragments === false ) {
  723. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  724. element.classList.add( 'visible' );
  725. element.classList.remove( 'current-fragment' );
  726. } );
  727. }
  728. sync();
  729. }
  730. /**
  731. * Binds all event listeners.
  732. */
  733. function addEventListeners() {
  734. eventsAreBound = true;
  735. window.addEventListener( 'hashchange', onWindowHashChange, false );
  736. window.addEventListener( 'resize', onWindowResize, false );
  737. if( config.touch ) {
  738. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  739. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  740. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  741. // Support pointer-style touch interaction as well
  742. if( window.navigator.pointerEnabled ) {
  743. // IE 11 uses un-prefixed version of pointer events
  744. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  745. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  746. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  747. }
  748. else if( window.navigator.msPointerEnabled ) {
  749. // IE 10 uses prefixed version of pointer events
  750. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  751. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  752. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  753. }
  754. }
  755. if( config.keyboard ) {
  756. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  757. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  758. }
  759. if( config.progress && dom.progress ) {
  760. dom.progress.addEventListener( 'click', onProgressClicked, false );
  761. }
  762. if( config.focusBodyOnPageVisibilityChange ) {
  763. var visibilityChange;
  764. if( 'hidden' in document ) {
  765. visibilityChange = 'visibilitychange';
  766. }
  767. else if( 'msHidden' in document ) {
  768. visibilityChange = 'msvisibilitychange';
  769. }
  770. else if( 'webkitHidden' in document ) {
  771. visibilityChange = 'webkitvisibilitychange';
  772. }
  773. if( visibilityChange ) {
  774. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  775. }
  776. }
  777. // Listen to both touch and click events, in case the device
  778. // supports both
  779. var pointerEvents = [ 'touchstart', 'click' ];
  780. // Only support touch for Android, fixes double navigations in
  781. // stock browser
  782. if( navigator.userAgent.match( /android/gi ) ) {
  783. pointerEvents = [ 'touchstart' ];
  784. }
  785. pointerEvents.forEach( function( eventName ) {
  786. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  787. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  788. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  789. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  790. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  791. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  792. } );
  793. }
  794. /**
  795. * Unbinds all event listeners.
  796. */
  797. function removeEventListeners() {
  798. eventsAreBound = false;
  799. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  800. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  801. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  802. window.removeEventListener( 'resize', onWindowResize, false );
  803. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  804. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  805. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  806. // IE11
  807. if( window.navigator.pointerEnabled ) {
  808. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  809. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  810. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  811. }
  812. // IE10
  813. else if( window.navigator.msPointerEnabled ) {
  814. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  815. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  816. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  817. }
  818. if ( config.progress && dom.progress ) {
  819. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  820. }
  821. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  822. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  823. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  824. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  825. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  826. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  827. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  828. } );
  829. }
  830. /**
  831. * Extend object a with the properties of object b.
  832. * If there's a conflict, object b takes precedence.
  833. */
  834. function extend( a, b ) {
  835. for( var i in b ) {
  836. a[ i ] = b[ i ];
  837. }
  838. }
  839. /**
  840. * Converts the target object to an array.
  841. */
  842. function toArray( o ) {
  843. return Array.prototype.slice.call( o );
  844. }
  845. /**
  846. * Utility for deserializing a value.
  847. */
  848. function deserialize( value ) {
  849. if( typeof value === 'string' ) {
  850. if( value === 'null' ) return null;
  851. else if( value === 'true' ) return true;
  852. else if( value === 'false' ) return false;
  853. else if( value.match( /^\d+$/ ) ) return parseFloat( value );
  854. }
  855. return value;
  856. }
  857. /**
  858. * Measures the distance in pixels between point a
  859. * and point b.
  860. *
  861. * @param {Object} a point with x/y properties
  862. * @param {Object} b point with x/y properties
  863. */
  864. function distanceBetween( a, b ) {
  865. var dx = a.x - b.x,
  866. dy = a.y - b.y;
  867. return Math.sqrt( dx*dx + dy*dy );
  868. }
  869. /**
  870. * Applies a CSS transform to the target element.
  871. */
  872. function transformElement( element, transform ) {
  873. element.style.WebkitTransform = transform;
  874. element.style.MozTransform = transform;
  875. element.style.msTransform = transform;
  876. element.style.transform = transform;
  877. }
  878. /**
  879. * Applies CSS transforms to the slides container. The container
  880. * is transformed from two separate sources: layout and the overview
  881. * mode.
  882. */
  883. function transformSlides( transforms ) {
  884. // Pick up new transforms from arguments
  885. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  886. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  887. // Apply the transforms to the slides container
  888. if( slidesTransform.layout ) {
  889. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  890. }
  891. else {
  892. transformElement( dom.slides, slidesTransform.overview );
  893. }
  894. }
  895. /**
  896. * Injects the given CSS styles into the DOM.
  897. */
  898. function injectStyleSheet( value ) {
  899. var tag = document.createElement( 'style' );
  900. tag.type = 'text/css';
  901. if( tag.styleSheet ) {
  902. tag.styleSheet.cssText = value;
  903. }
  904. else {
  905. tag.appendChild( document.createTextNode( value ) );
  906. }
  907. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  908. }
  909. /**
  910. * Converts various color input formats to an {r:0,g:0,b:0} object.
  911. *
  912. * @param {String} color The string representation of a color,
  913. * the following formats are supported:
  914. * - #000
  915. * - #000000
  916. * - rgb(0,0,0)
  917. */
  918. function colorToRgb( color ) {
  919. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  920. if( hex3 && hex3[1] ) {
  921. hex3 = hex3[1];
  922. return {
  923. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  924. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  925. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  926. };
  927. }
  928. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  929. if( hex6 && hex6[1] ) {
  930. hex6 = hex6[1];
  931. return {
  932. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  933. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  934. b: parseInt( hex6.substr( 4, 2 ), 16 )
  935. };
  936. }
  937. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  938. if( rgb ) {
  939. return {
  940. r: parseInt( rgb[1], 10 ),
  941. g: parseInt( rgb[2], 10 ),
  942. b: parseInt( rgb[3], 10 )
  943. };
  944. }
  945. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  946. if( rgba ) {
  947. return {
  948. r: parseInt( rgba[1], 10 ),
  949. g: parseInt( rgba[2], 10 ),
  950. b: parseInt( rgba[3], 10 ),
  951. a: parseFloat( rgba[4] )
  952. };
  953. }
  954. return null;
  955. }
  956. /**
  957. * Calculates brightness on a scale of 0-255.
  958. *
  959. * @param color See colorStringToRgb for supported formats.
  960. */
  961. function colorBrightness( color ) {
  962. if( typeof color === 'string' ) color = colorToRgb( color );
  963. if( color ) {
  964. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  965. }
  966. return null;
  967. }
  968. /**
  969. * Retrieves the height of the given element by looking
  970. * at the position and height of its immediate children.
  971. */
  972. function getAbsoluteHeight( element ) {
  973. var height = 0;
  974. if( element ) {
  975. var absoluteChildren = 0;
  976. toArray( element.childNodes ).forEach( function( child ) {
  977. if( typeof child.offsetTop === 'number' && child.style ) {
  978. // Count # of abs children
  979. if( window.getComputedStyle( child ).position === 'absolute' ) {
  980. absoluteChildren += 1;
  981. }
  982. height = Math.max( height, child.offsetTop + child.offsetHeight );
  983. }
  984. } );
  985. // If there are no absolute children, use offsetHeight
  986. if( absoluteChildren === 0 ) {
  987. height = element.offsetHeight;
  988. }
  989. }
  990. return height;
  991. }
  992. /**
  993. * Returns the remaining height within the parent of the
  994. * target element.
  995. *
  996. * remaining height = [ configured parent height ] - [ current parent height ]
  997. */
  998. function getRemainingHeight( element, height ) {
  999. height = height || 0;
  1000. if( element ) {
  1001. var newHeight, oldHeight = element.style.height;
  1002. // Change the .stretch element height to 0 in order find the height of all
  1003. // the other elements
  1004. element.style.height = '0px';
  1005. newHeight = height - element.parentNode.offsetHeight;
  1006. // Restore the old height, just in case
  1007. element.style.height = oldHeight + 'px';
  1008. return newHeight;
  1009. }
  1010. return height;
  1011. }
  1012. /**
  1013. * Checks if this instance is being used to print a PDF.
  1014. */
  1015. function isPrintingPDF() {
  1016. return ( /print-pdf/gi ).test( window.location.search );
  1017. }
  1018. /**
  1019. * Hides the address bar if we're on a mobile device.
  1020. */
  1021. function hideAddressBar() {
  1022. if( config.hideAddressBar && isMobileDevice ) {
  1023. // Events that should trigger the address bar to hide
  1024. window.addEventListener( 'load', removeAddressBar, false );
  1025. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1026. }
  1027. }
  1028. /**
  1029. * Causes the address bar to hide on mobile devices,
  1030. * more vertical space ftw.
  1031. */
  1032. function removeAddressBar() {
  1033. setTimeout( function() {
  1034. window.scrollTo( 0, 1 );
  1035. }, 10 );
  1036. }
  1037. /**
  1038. * Dispatches an event of the specified type from the
  1039. * reveal DOM element.
  1040. */
  1041. function dispatchEvent( type, args ) {
  1042. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1043. event.initEvent( type, true, true );
  1044. extend( event, args );
  1045. dom.wrapper.dispatchEvent( event );
  1046. // If we're in an iframe, post each reveal.js event to the
  1047. // parent window. Used by the notes plugin
  1048. if( config.postMessageEvents && window.parent !== window.self ) {
  1049. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  1050. }
  1051. }
  1052. /**
  1053. * Wrap all links in 3D goodness.
  1054. */
  1055. function enableRollingLinks() {
  1056. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1057. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1058. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1059. var anchor = anchors[i];
  1060. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1061. var span = document.createElement('span');
  1062. span.setAttribute('data-title', anchor.text);
  1063. span.innerHTML = anchor.innerHTML;
  1064. anchor.classList.add( 'roll' );
  1065. anchor.innerHTML = '';
  1066. anchor.appendChild(span);
  1067. }
  1068. }
  1069. }
  1070. }
  1071. /**
  1072. * Unwrap all 3D links.
  1073. */
  1074. function disableRollingLinks() {
  1075. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1076. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1077. var anchor = anchors[i];
  1078. var span = anchor.querySelector( 'span' );
  1079. if( span ) {
  1080. anchor.classList.remove( 'roll' );
  1081. anchor.innerHTML = span.innerHTML;
  1082. }
  1083. }
  1084. }
  1085. /**
  1086. * Bind preview frame links.
  1087. */
  1088. function enablePreviewLinks( selector ) {
  1089. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1090. anchors.forEach( function( element ) {
  1091. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1092. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1093. }
  1094. } );
  1095. }
  1096. /**
  1097. * Unbind preview frame links.
  1098. */
  1099. function disablePreviewLinks() {
  1100. var anchors = toArray( document.querySelectorAll( 'a' ) );
  1101. anchors.forEach( function( element ) {
  1102. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1103. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1104. }
  1105. } );
  1106. }
  1107. /**
  1108. * Opens a preview window for the target URL.
  1109. */
  1110. function showPreview( url ) {
  1111. closeOverlay();
  1112. dom.overlay = document.createElement( 'div' );
  1113. dom.overlay.classList.add( 'overlay' );
  1114. dom.overlay.classList.add( 'overlay-preview' );
  1115. dom.wrapper.appendChild( dom.overlay );
  1116. dom.overlay.innerHTML = [
  1117. '<header>',
  1118. '<a class="close" href="#"><span class="icon"></span></a>',
  1119. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1120. '</header>',
  1121. '<div class="spinner"></div>',
  1122. '<div class="viewport">',
  1123. '<iframe src="'+ url +'"></iframe>',
  1124. '</div>'
  1125. ].join('');
  1126. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1127. dom.overlay.classList.add( 'loaded' );
  1128. }, false );
  1129. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1130. closeOverlay();
  1131. event.preventDefault();
  1132. }, false );
  1133. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1134. closeOverlay();
  1135. }, false );
  1136. setTimeout( function() {
  1137. dom.overlay.classList.add( 'visible' );
  1138. }, 1 );
  1139. }
  1140. /**
  1141. * Opens a overlay window with help material.
  1142. */
  1143. function showHelp() {
  1144. if( config.help ) {
  1145. closeOverlay();
  1146. dom.overlay = document.createElement( 'div' );
  1147. dom.overlay.classList.add( 'overlay' );
  1148. dom.overlay.classList.add( 'overlay-help' );
  1149. dom.wrapper.appendChild( dom.overlay );
  1150. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1151. html += '<table><th>KEY</th><th>ACTION</th>';
  1152. for( var key in keyboardShortcuts ) {
  1153. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1154. }
  1155. html += '</table>';
  1156. dom.overlay.innerHTML = [
  1157. '<header>',
  1158. '<a class="close" href="#"><span class="icon"></span></a>',
  1159. '</header>',
  1160. '<div class="viewport">',
  1161. '<div class="viewport-inner">'+ html +'</div>',
  1162. '</div>'
  1163. ].join('');
  1164. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1165. closeOverlay();
  1166. event.preventDefault();
  1167. }, false );
  1168. setTimeout( function() {
  1169. dom.overlay.classList.add( 'visible' );
  1170. }, 1 );
  1171. }
  1172. }
  1173. /**
  1174. * Closes any currently open overlay.
  1175. */
  1176. function closeOverlay() {
  1177. if( dom.overlay ) {
  1178. dom.overlay.parentNode.removeChild( dom.overlay );
  1179. dom.overlay = null;
  1180. }
  1181. }
  1182. /**
  1183. * Applies JavaScript-controlled layout rules to the
  1184. * presentation.
  1185. */
  1186. function layout() {
  1187. if( dom.wrapper && !isPrintingPDF() ) {
  1188. var size = getComputedSlideSize();
  1189. var slidePadding = 20; // TODO Dig this out of DOM
  1190. // Layout the contents of the slides
  1191. layoutSlideContents( config.width, config.height, slidePadding );
  1192. dom.slides.style.width = size.width + 'px';
  1193. dom.slides.style.height = size.height + 'px';
  1194. // Determine scale of content to fit within available space
  1195. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1196. // Respect max/min scale settings
  1197. scale = Math.max( scale, config.minScale );
  1198. scale = Math.min( scale, config.maxScale );
  1199. // Don't apply any scaling styles if scale is 1
  1200. if( scale === 1 ) {
  1201. dom.slides.style.zoom = '';
  1202. dom.slides.style.left = '';
  1203. dom.slides.style.top = '';
  1204. dom.slides.style.bottom = '';
  1205. dom.slides.style.right = '';
  1206. transformSlides( { layout: '' } );
  1207. }
  1208. else {
  1209. // Use zoom to scale up in desktop Chrome so that content
  1210. // remains crisp. We don't use zoom to scale down since that
  1211. // can lead to shifts in text layout/line breaks.
  1212. if( scale > 1 && !isMobileDevice && /chrome/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) {
  1213. dom.slides.style.zoom = scale;
  1214. dom.slides.style.left = '';
  1215. dom.slides.style.top = '';
  1216. dom.slides.style.bottom = '';
  1217. dom.slides.style.right = '';
  1218. transformSlides( { layout: '' } );
  1219. }
  1220. // Apply scale transform as a fallback
  1221. else {
  1222. dom.slides.style.zoom = '';
  1223. dom.slides.style.left = '50%';
  1224. dom.slides.style.top = '50%';
  1225. dom.slides.style.bottom = 'auto';
  1226. dom.slides.style.right = 'auto';
  1227. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1228. }
  1229. }
  1230. // Select all slides, vertical and horizontal
  1231. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1232. for( var i = 0, len = slides.length; i < len; i++ ) {
  1233. var slide = slides[ i ];
  1234. // Don't bother updating invisible slides
  1235. if( slide.style.display === 'none' ) {
  1236. continue;
  1237. }
  1238. if( config.center || slide.classList.contains( 'center' ) ) {
  1239. // Vertical stacks are not centred since their section
  1240. // children will be
  1241. if( slide.classList.contains( 'stack' ) ) {
  1242. slide.style.top = 0;
  1243. }
  1244. else {
  1245. slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
  1246. }
  1247. }
  1248. else {
  1249. slide.style.top = '';
  1250. }
  1251. }
  1252. updateProgress();
  1253. updateParallax();
  1254. }
  1255. }
  1256. /**
  1257. * Applies layout logic to the contents of all slides in
  1258. * the presentation.
  1259. */
  1260. function layoutSlideContents( width, height, padding ) {
  1261. // Handle sizing of elements with the 'stretch' class
  1262. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1263. // Determine how much vertical space we can use
  1264. var remainingHeight = getRemainingHeight( element, height );
  1265. // Consider the aspect ratio of media elements
  1266. if( /(img|video)/gi.test( element.nodeName ) ) {
  1267. var nw = element.naturalWidth || element.videoWidth,
  1268. nh = element.naturalHeight || element.videoHeight;
  1269. var es = Math.min( width / nw, remainingHeight / nh );
  1270. element.style.width = ( nw * es ) + 'px';
  1271. element.style.height = ( nh * es ) + 'px';
  1272. }
  1273. else {
  1274. element.style.width = width + 'px';
  1275. element.style.height = remainingHeight + 'px';
  1276. }
  1277. } );
  1278. }
  1279. /**
  1280. * Calculates the computed pixel size of our slides. These
  1281. * values are based on the width and height configuration
  1282. * options.
  1283. */
  1284. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1285. var size = {
  1286. // Slide size
  1287. width: config.width,
  1288. height: config.height,
  1289. // Presentation size
  1290. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1291. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1292. };
  1293. // Reduce available space by margin
  1294. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1295. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1296. // Slide width may be a percentage of available width
  1297. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1298. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1299. }
  1300. // Slide height may be a percentage of available height
  1301. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1302. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1303. }
  1304. return size;
  1305. }
  1306. /**
  1307. * Stores the vertical index of a stack so that the same
  1308. * vertical slide can be selected when navigating to and
  1309. * from the stack.
  1310. *
  1311. * @param {HTMLElement} stack The vertical stack element
  1312. * @param {int} v Index to memorize
  1313. */
  1314. function setPreviousVerticalIndex( stack, v ) {
  1315. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1316. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1317. }
  1318. }
  1319. /**
  1320. * Retrieves the vertical index which was stored using
  1321. * #setPreviousVerticalIndex() or 0 if no previous index
  1322. * exists.
  1323. *
  1324. * @param {HTMLElement} stack The vertical stack element
  1325. */
  1326. function getPreviousVerticalIndex( stack ) {
  1327. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1328. // Prefer manually defined start-indexv
  1329. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1330. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1331. }
  1332. return 0;
  1333. }
  1334. /**
  1335. * Displays the overview of slides (quick nav) by scaling
  1336. * down and arranging all slide elements.
  1337. */
  1338. function activateOverview() {
  1339. // Only proceed if enabled in config
  1340. if( config.overview && !isOverview() ) {
  1341. overview = true;
  1342. dom.wrapper.classList.add( 'overview' );
  1343. dom.wrapper.classList.remove( 'overview-deactivating' );
  1344. if( features.overviewTransitions ) {
  1345. setTimeout( function() {
  1346. dom.wrapper.classList.add( 'overview-animated' );
  1347. }, 1 );
  1348. }
  1349. // Don't auto-slide while in overview mode
  1350. cancelAutoSlide();
  1351. // Move the backgrounds element into the slide container to
  1352. // that the same scaling is applied
  1353. dom.slides.appendChild( dom.background );
  1354. // Clicking on an overview slide navigates to it
  1355. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1356. if( !slide.classList.contains( 'stack' ) ) {
  1357. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1358. }
  1359. } );
  1360. updateSlidesVisibility();
  1361. layoutOverview();
  1362. updateOverview();
  1363. layout();
  1364. // Notify observers of the overview showing
  1365. dispatchEvent( 'overviewshown', {
  1366. 'indexh': indexh,
  1367. 'indexv': indexv,
  1368. 'currentSlide': currentSlide
  1369. } );
  1370. }
  1371. }
  1372. /**
  1373. * Uses CSS transforms to position all slides in a grid for
  1374. * display inside of the overview mode.
  1375. */
  1376. function layoutOverview() {
  1377. var margin = 70;
  1378. var slideWidth = config.width + margin,
  1379. slideHeight = config.height + margin;
  1380. // Reverse in RTL mode
  1381. if( config.rtl ) {
  1382. slideWidth = -slideWidth;
  1383. }
  1384. // Layout slides
  1385. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1386. hslide.setAttribute( 'data-index-h', h );
  1387. transformElement( hslide, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' );
  1388. if( hslide.classList.contains( 'stack' ) ) {
  1389. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1390. vslide.setAttribute( 'data-index-h', h );
  1391. vslide.setAttribute( 'data-index-v', v );
  1392. transformElement( vslide, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' );
  1393. } );
  1394. }
  1395. } );
  1396. // Layout slide backgrounds
  1397. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1398. transformElement( hbackground, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' );
  1399. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1400. transformElement( vbackground, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' );
  1401. } );
  1402. } );
  1403. }
  1404. /**
  1405. * Moves the overview viewport to the current slides.
  1406. * Called each time the current slide changes.
  1407. */
  1408. function updateOverview() {
  1409. var margin = 70;
  1410. var slideWidth = config.width + margin,
  1411. slideHeight = config.height + margin;
  1412. // Reverse in RTL mode
  1413. if( config.rtl ) {
  1414. slideWidth = -slideWidth;
  1415. }
  1416. transformSlides( {
  1417. overview: [
  1418. 'translateX('+ ( -indexh * slideWidth ) +'px)',
  1419. 'translateY('+ ( -indexv * slideHeight ) +'px)',
  1420. 'translateZ('+ ( window.innerWidth < 400 ? -1000 : -2500 ) +'px)'
  1421. ].join( ' ' )
  1422. } );
  1423. }
  1424. /**
  1425. * Exits the slide overview and enters the currently
  1426. * active slide.
  1427. */
  1428. function deactivateOverview() {
  1429. // Only proceed if enabled in config
  1430. if( config.overview ) {
  1431. overview = false;
  1432. dom.wrapper.classList.remove( 'overview' );
  1433. dom.wrapper.classList.remove( 'overview-animated' );
  1434. // Temporarily add a class so that transitions can do different things
  1435. // depending on whether they are exiting/entering overview, or just
  1436. // moving from slide to slide
  1437. dom.wrapper.classList.add( 'overview-deactivating' );
  1438. setTimeout( function () {
  1439. dom.wrapper.classList.remove( 'overview-deactivating' );
  1440. }, 1 );
  1441. // Move the background element back out
  1442. dom.wrapper.appendChild( dom.background );
  1443. // Clean up changes made to slides
  1444. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1445. transformElement( slide, '' );
  1446. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1447. } );
  1448. // Clean up changes made to backgrounds
  1449. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  1450. transformElement( background, '' );
  1451. } );
  1452. transformSlides( { overview: '' } );
  1453. slide( indexh, indexv );
  1454. layout();
  1455. cueAutoSlide();
  1456. // Notify observers of the overview hiding
  1457. dispatchEvent( 'overviewhidden', {
  1458. 'indexh': indexh,
  1459. 'indexv': indexv,
  1460. 'currentSlide': currentSlide
  1461. } );
  1462. }
  1463. }
  1464. /**
  1465. * Toggles the slide overview mode on and off.
  1466. *
  1467. * @param {Boolean} override Optional flag which overrides the
  1468. * toggle logic and forcibly sets the desired state. True means
  1469. * overview is open, false means it's closed.
  1470. */
  1471. function toggleOverview( override ) {
  1472. if( typeof override === 'boolean' ) {
  1473. override ? activateOverview() : deactivateOverview();
  1474. }
  1475. else {
  1476. isOverview() ? deactivateOverview() : activateOverview();
  1477. }
  1478. }
  1479. /**
  1480. * Checks if the overview is currently active.
  1481. *
  1482. * @return {Boolean} true if the overview is active,
  1483. * false otherwise
  1484. */
  1485. function isOverview() {
  1486. return overview;
  1487. }
  1488. /**
  1489. * Checks if the current or specified slide is vertical
  1490. * (nested within another slide).
  1491. *
  1492. * @param {HTMLElement} slide [optional] The slide to check
  1493. * orientation of
  1494. */
  1495. function isVerticalSlide( slide ) {
  1496. // Prefer slide argument, otherwise use current slide
  1497. slide = slide ? slide : currentSlide;
  1498. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1499. }
  1500. /**
  1501. * Handling the fullscreen functionality via the fullscreen API
  1502. *
  1503. * @see http://fullscreen.spec.whatwg.org/
  1504. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1505. */
  1506. function enterFullscreen() {
  1507. var element = document.body;
  1508. // Check which implementation is available
  1509. var requestMethod = element.requestFullScreen ||
  1510. element.webkitRequestFullscreen ||
  1511. element.webkitRequestFullScreen ||
  1512. element.mozRequestFullScreen ||
  1513. element.msRequestFullscreen;
  1514. if( requestMethod ) {
  1515. requestMethod.apply( element );
  1516. }
  1517. }
  1518. /**
  1519. * Enters the paused mode which fades everything on screen to
  1520. * black.
  1521. */
  1522. function pause() {
  1523. if( config.pause ) {
  1524. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1525. cancelAutoSlide();
  1526. dom.wrapper.classList.add( 'paused' );
  1527. if( wasPaused === false ) {
  1528. dispatchEvent( 'paused' );
  1529. }
  1530. }
  1531. }
  1532. /**
  1533. * Exits from the paused mode.
  1534. */
  1535. function resume() {
  1536. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1537. dom.wrapper.classList.remove( 'paused' );
  1538. cueAutoSlide();
  1539. if( wasPaused ) {
  1540. dispatchEvent( 'resumed' );
  1541. }
  1542. }
  1543. /**
  1544. * Toggles the paused mode on and off.
  1545. */
  1546. function togglePause( override ) {
  1547. if( typeof override === 'boolean' ) {
  1548. override ? pause() : resume();
  1549. }
  1550. else {
  1551. isPaused() ? resume() : pause();
  1552. }
  1553. }
  1554. /**
  1555. * Checks if we are currently in the paused mode.
  1556. */
  1557. function isPaused() {
  1558. return dom.wrapper.classList.contains( 'paused' );
  1559. }
  1560. /**
  1561. * Toggles the auto slide mode on and off.
  1562. *
  1563. * @param {Boolean} override Optional flag which sets the desired state.
  1564. * True means autoplay starts, false means it stops.
  1565. */
  1566. function toggleAutoSlide( override ) {
  1567. if( typeof override === 'boolean' ) {
  1568. override ? resumeAutoSlide() : pauseAutoSlide();
  1569. }
  1570. else {
  1571. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  1572. }
  1573. }
  1574. /**
  1575. * Checks if the auto slide mode is currently on.
  1576. */
  1577. function isAutoSliding() {
  1578. return !!( autoSlide && !autoSlidePaused );
  1579. }
  1580. /**
  1581. * Steps from the current point in the presentation to the
  1582. * slide which matches the specified horizontal and vertical
  1583. * indices.
  1584. *
  1585. * @param {int} h Horizontal index of the target slide
  1586. * @param {int} v Vertical index of the target slide
  1587. * @param {int} f Optional index of a fragment within the
  1588. * target slide to activate
  1589. * @param {int} o Optional origin for use in multimaster environments
  1590. */
  1591. function slide( h, v, f, o ) {
  1592. // Remember where we were at before
  1593. previousSlide = currentSlide;
  1594. // Query all horizontal slides in the deck
  1595. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1596. // If no vertical index is specified and the upcoming slide is a
  1597. // stack, resume at its previous vertical index
  1598. if( v === undefined && !isOverview() ) {
  1599. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1600. }
  1601. // If we were on a vertical stack, remember what vertical index
  1602. // it was on so we can resume at the same position when returning
  1603. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1604. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1605. }
  1606. // Remember the state before this slide
  1607. var stateBefore = state.concat();
  1608. // Reset the state array
  1609. state.length = 0;
  1610. var indexhBefore = indexh || 0,
  1611. indexvBefore = indexv || 0;
  1612. // Activate and transition to the new slide
  1613. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1614. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1615. // Update the visibility of slides now that the indices have changed
  1616. updateSlidesVisibility();
  1617. layout();
  1618. // Apply the new state
  1619. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1620. // Check if this state existed on the previous slide. If it
  1621. // did, we will avoid adding it repeatedly
  1622. for( var j = 0; j < stateBefore.length; j++ ) {
  1623. if( stateBefore[j] === state[i] ) {
  1624. stateBefore.splice( j, 1 );
  1625. continue stateLoop;
  1626. }
  1627. }
  1628. document.documentElement.classList.add( state[i] );
  1629. // Dispatch custom event matching the state's name
  1630. dispatchEvent( state[i] );
  1631. }
  1632. // Clean up the remains of the previous state
  1633. while( stateBefore.length ) {
  1634. document.documentElement.classList.remove( stateBefore.pop() );
  1635. }
  1636. // Update the overview if it's currently active
  1637. if( isOverview() ) {
  1638. updateOverview();
  1639. }
  1640. // Find the current horizontal slide and any possible vertical slides
  1641. // within it
  1642. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1643. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1644. // Store references to the previous and current slides
  1645. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1646. // Show fragment, if specified
  1647. if( typeof f !== 'undefined' ) {
  1648. navigateFragment( f );
  1649. }
  1650. // Dispatch an event if the slide changed
  1651. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1652. if( slideChanged ) {
  1653. dispatchEvent( 'slidechanged', {
  1654. 'indexh': indexh,
  1655. 'indexv': indexv,
  1656. 'previousSlide': previousSlide,
  1657. 'currentSlide': currentSlide,
  1658. 'origin': o
  1659. } );
  1660. }
  1661. else {
  1662. // Ensure that the previous slide is never the same as the current
  1663. previousSlide = null;
  1664. }
  1665. // Solves an edge case where the previous slide maintains the
  1666. // 'present' class when navigating between adjacent vertical
  1667. // stacks
  1668. if( previousSlide ) {
  1669. previousSlide.classList.remove( 'present' );
  1670. previousSlide.setAttribute( 'aria-hidden', 'true' );
  1671. // Reset all slides upon navigate to home
  1672. // Issue: #285
  1673. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1674. // Launch async task
  1675. setTimeout( function () {
  1676. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1677. for( i in slides ) {
  1678. if( slides[i] ) {
  1679. // Reset stack
  1680. setPreviousVerticalIndex( slides[i], 0 );
  1681. }
  1682. }
  1683. }, 0 );
  1684. }
  1685. }
  1686. // Handle embedded content
  1687. if( slideChanged || !previousSlide ) {
  1688. stopEmbeddedContent( previousSlide );
  1689. startEmbeddedContent( currentSlide );
  1690. }
  1691. // Announce the current slide contents, for screen readers
  1692. dom.statusDiv.textContent = currentSlide.textContent;
  1693. updateControls();
  1694. updateProgress();
  1695. updateBackground();
  1696. updateParallax();
  1697. updateSlideNumber();
  1698. updateNotes();
  1699. // Update the URL hash
  1700. writeURL();
  1701. cueAutoSlide();
  1702. }
  1703. /**
  1704. * Syncs the presentation with the current DOM. Useful
  1705. * when new slides or control elements are added or when
  1706. * the configuration has changed.
  1707. */
  1708. function sync() {
  1709. // Subscribe to input
  1710. removeEventListeners();
  1711. addEventListeners();
  1712. // Force a layout to make sure the current config is accounted for
  1713. layout();
  1714. // Reflect the current autoSlide value
  1715. autoSlide = config.autoSlide;
  1716. // Start auto-sliding if it's enabled
  1717. cueAutoSlide();
  1718. // Re-create the slide backgrounds
  1719. createBackgrounds();
  1720. // Write the current hash to the URL
  1721. writeURL();
  1722. sortAllFragments();
  1723. updateControls();
  1724. updateProgress();
  1725. updateBackground( true );
  1726. updateSlideNumber();
  1727. updateSlidesVisibility();
  1728. updateNotes();
  1729. formatEmbeddedContent();
  1730. startEmbeddedContent( currentSlide );
  1731. if( isOverview() ) {
  1732. layoutOverview();
  1733. }
  1734. }
  1735. /**
  1736. * Resets all vertical slides so that only the first
  1737. * is visible.
  1738. */
  1739. function resetVerticalSlides() {
  1740. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1741. horizontalSlides.forEach( function( horizontalSlide ) {
  1742. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1743. verticalSlides.forEach( function( verticalSlide, y ) {
  1744. if( y > 0 ) {
  1745. verticalSlide.classList.remove( 'present' );
  1746. verticalSlide.classList.remove( 'past' );
  1747. verticalSlide.classList.add( 'future' );
  1748. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  1749. }
  1750. } );
  1751. } );
  1752. }
  1753. /**
  1754. * Sorts and formats all of fragments in the
  1755. * presentation.
  1756. */
  1757. function sortAllFragments() {
  1758. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1759. horizontalSlides.forEach( function( horizontalSlide ) {
  1760. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1761. verticalSlides.forEach( function( verticalSlide, y ) {
  1762. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  1763. } );
  1764. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  1765. } );
  1766. }
  1767. /**
  1768. * Updates one dimension of slides by showing the slide
  1769. * with the specified index.
  1770. *
  1771. * @param {String} selector A CSS selector that will fetch
  1772. * the group of slides we are working with
  1773. * @param {Number} index The index of the slide that should be
  1774. * shown
  1775. *
  1776. * @return {Number} The index of the slide that is now shown,
  1777. * might differ from the passed in index if it was out of
  1778. * bounds.
  1779. */
  1780. function updateSlides( selector, index ) {
  1781. // Select all slides and convert the NodeList result to
  1782. // an array
  1783. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  1784. slidesLength = slides.length;
  1785. var printMode = isPrintingPDF();
  1786. if( slidesLength ) {
  1787. // Should the index loop?
  1788. if( config.loop ) {
  1789. index %= slidesLength;
  1790. if( index < 0 ) {
  1791. index = slidesLength + index;
  1792. }
  1793. }
  1794. // Enforce max and minimum index bounds
  1795. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1796. for( var i = 0; i < slidesLength; i++ ) {
  1797. var element = slides[i];
  1798. var reverse = config.rtl && !isVerticalSlide( element );
  1799. element.classList.remove( 'past' );
  1800. element.classList.remove( 'present' );
  1801. element.classList.remove( 'future' );
  1802. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1803. element.setAttribute( 'hidden', '' );
  1804. element.setAttribute( 'aria-hidden', 'true' );
  1805. // If this element contains vertical slides
  1806. if( element.querySelector( 'section' ) ) {
  1807. element.classList.add( 'stack' );
  1808. }
  1809. // If we're printing static slides, all slides are "present"
  1810. if( printMode ) {
  1811. element.classList.add( 'present' );
  1812. continue;
  1813. }
  1814. if( i < index ) {
  1815. // Any element previous to index is given the 'past' class
  1816. element.classList.add( reverse ? 'future' : 'past' );
  1817. if( config.fragments ) {
  1818. var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
  1819. // Show all fragments on prior slides
  1820. while( pastFragments.length ) {
  1821. var pastFragment = pastFragments.pop();
  1822. pastFragment.classList.add( 'visible' );
  1823. pastFragment.classList.remove( 'current-fragment' );
  1824. }
  1825. }
  1826. }
  1827. else if( i > index ) {
  1828. // Any element subsequent to index is given the 'future' class
  1829. element.classList.add( reverse ? 'past' : 'future' );
  1830. if( config.fragments ) {
  1831. var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1832. // No fragments in future slides should be visible ahead of time
  1833. while( futureFragments.length ) {
  1834. var futureFragment = futureFragments.pop();
  1835. futureFragment.classList.remove( 'visible' );
  1836. futureFragment.classList.remove( 'current-fragment' );
  1837. }
  1838. }
  1839. }
  1840. }
  1841. // Mark the current slide as present
  1842. slides[index].classList.add( 'present' );
  1843. slides[index].removeAttribute( 'hidden' );
  1844. slides[index].removeAttribute( 'aria-hidden' );
  1845. // If this slide has a state associated with it, add it
  1846. // onto the current state of the deck
  1847. var slideState = slides[index].getAttribute( 'data-state' );
  1848. if( slideState ) {
  1849. state = state.concat( slideState.split( ' ' ) );
  1850. }
  1851. }
  1852. else {
  1853. // Since there are no slides we can't be anywhere beyond the
  1854. // zeroth index
  1855. index = 0;
  1856. }
  1857. return index;
  1858. }
  1859. /**
  1860. * Optimization method; hide all slides that are far away
  1861. * from the present slide.
  1862. */
  1863. function updateSlidesVisibility() {
  1864. // Select all slides and convert the NodeList result to
  1865. // an array
  1866. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1867. horizontalSlidesLength = horizontalSlides.length,
  1868. distanceX,
  1869. distanceY;
  1870. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  1871. // The number of steps away from the present slide that will
  1872. // be visible
  1873. var viewDistance = isOverview() ? 10 : config.viewDistance;
  1874. // Limit view distance on weaker devices
  1875. if( isMobileDevice ) {
  1876. viewDistance = isOverview() ? 6 : 2;
  1877. }
  1878. // All slides need to be visible when exporting to PDF
  1879. if( isPrintingPDF() ) {
  1880. viewDistance = Number.MAX_VALUE;
  1881. }
  1882. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1883. var horizontalSlide = horizontalSlides[x];
  1884. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1885. verticalSlidesLength = verticalSlides.length;
  1886. // Determine how far away this slide is from the present
  1887. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  1888. // If the presentation is looped, distance should measure
  1889. // 1 between the first and last slides
  1890. if( config.loop ) {
  1891. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1892. }
  1893. // Show the horizontal slide if it's within the view distance
  1894. if( distanceX < viewDistance ) {
  1895. showSlide( horizontalSlide );
  1896. }
  1897. else {
  1898. hideSlide( horizontalSlide );
  1899. }
  1900. if( verticalSlidesLength ) {
  1901. var oy = getPreviousVerticalIndex( horizontalSlide );
  1902. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1903. var verticalSlide = verticalSlides[y];
  1904. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  1905. if( distanceX + distanceY < viewDistance ) {
  1906. showSlide( verticalSlide );
  1907. }
  1908. else {
  1909. hideSlide( verticalSlide );
  1910. }
  1911. }
  1912. }
  1913. }
  1914. }
  1915. }
  1916. /**
  1917. * Pick up notes from the current slide and display tham
  1918. * to the viewer.
  1919. *
  1920. * @see `showNotes` config value
  1921. */
  1922. function updateNotes() {
  1923. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  1924. dom.speakerNotes.innerHTML = getSlideNotes() || '';
  1925. }
  1926. }
  1927. /**
  1928. * Updates the progress bar to reflect the current slide.
  1929. */
  1930. function updateProgress() {
  1931. // Update progress if enabled
  1932. if( config.progress && dom.progressbar ) {
  1933. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  1934. }
  1935. }
  1936. /**
  1937. * Updates the slide number div to reflect the current slide.
  1938. *
  1939. * Slide number format can be defined as a string using the
  1940. * following variables:
  1941. * h: current slide's horizontal index
  1942. * v: current slide's vertical index
  1943. * c: current slide index (flattened)
  1944. * t: total number of slides (flattened)
  1945. */
  1946. function updateSlideNumber() {
  1947. // Update slide number if enabled
  1948. if( config.slideNumber && dom.slideNumber) {
  1949. // Default to only showing the current slide number
  1950. var format = 'c';
  1951. // Check if a custom slide number format is available
  1952. if( typeof config.slideNumber === 'string' ) {
  1953. format = config.slideNumber;
  1954. }
  1955. dom.slideNumber.innerHTML = format.replace( /h/g, indexh )
  1956. .replace( /v/g, indexv )
  1957. .replace( /c/g, getSlidePastCount() + 1 )
  1958. .replace( /t/g, getTotalSlides() );
  1959. }
  1960. }
  1961. /**
  1962. * Updates the state of all control/navigation arrows.
  1963. */
  1964. function updateControls() {
  1965. var routes = availableRoutes();
  1966. var fragments = availableFragments();
  1967. // Remove the 'enabled' class from all directions
  1968. dom.controlsLeft.concat( dom.controlsRight )
  1969. .concat( dom.controlsUp )
  1970. .concat( dom.controlsDown )
  1971. .concat( dom.controlsPrev )
  1972. .concat( dom.controlsNext ).forEach( function( node ) {
  1973. node.classList.remove( 'enabled' );
  1974. node.classList.remove( 'fragmented' );
  1975. } );
  1976. // Add the 'enabled' class to the available routes
  1977. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1978. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1979. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1980. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1981. // Prev/next buttons
  1982. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1983. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1984. // Highlight fragment directions
  1985. if( currentSlide ) {
  1986. // Always apply fragment decorator to prev/next buttons
  1987. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1988. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1989. // Apply fragment decorators to directional buttons based on
  1990. // what slide axis they are in
  1991. if( isVerticalSlide( currentSlide ) ) {
  1992. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1993. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1994. }
  1995. else {
  1996. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1997. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1998. }
  1999. }
  2000. }
  2001. /**
  2002. * Updates the background elements to reflect the current
  2003. * slide.
  2004. *
  2005. * @param {Boolean} includeAll If true, the backgrounds of
  2006. * all vertical slides (not just the present) will be updated.
  2007. */
  2008. function updateBackground( includeAll ) {
  2009. var currentBackground = null;
  2010. // Reverse past/future classes when in RTL mode
  2011. var horizontalPast = config.rtl ? 'future' : 'past',
  2012. horizontalFuture = config.rtl ? 'past' : 'future';
  2013. // Update the classes of all backgrounds to match the
  2014. // states of their slides (past/present/future)
  2015. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2016. backgroundh.classList.remove( 'past' );
  2017. backgroundh.classList.remove( 'present' );
  2018. backgroundh.classList.remove( 'future' );
  2019. if( h < indexh ) {
  2020. backgroundh.classList.add( horizontalPast );
  2021. }
  2022. else if ( h > indexh ) {
  2023. backgroundh.classList.add( horizontalFuture );
  2024. }
  2025. else {
  2026. backgroundh.classList.add( 'present' );
  2027. // Store a reference to the current background element
  2028. currentBackground = backgroundh;
  2029. }
  2030. if( includeAll || h === indexh ) {
  2031. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2032. backgroundv.classList.remove( 'past' );
  2033. backgroundv.classList.remove( 'present' );
  2034. backgroundv.classList.remove( 'future' );
  2035. if( v < indexv ) {
  2036. backgroundv.classList.add( 'past' );
  2037. }
  2038. else if ( v > indexv ) {
  2039. backgroundv.classList.add( 'future' );
  2040. }
  2041. else {
  2042. backgroundv.classList.add( 'present' );
  2043. // Only if this is the present horizontal and vertical slide
  2044. if( h === indexh ) currentBackground = backgroundv;
  2045. }
  2046. } );
  2047. }
  2048. } );
  2049. // Stop any currently playing video background
  2050. if( previousBackground ) {
  2051. var previousVideo = previousBackground.querySelector( 'video' );
  2052. if( previousVideo ) previousVideo.pause();
  2053. }
  2054. if( currentBackground ) {
  2055. // Start video playback
  2056. var currentVideo = currentBackground.querySelector( 'video' );
  2057. if( currentVideo ) {
  2058. if( currentVideo.currentTime > 0 ) currentVideo.currentTime = 0;
  2059. currentVideo.play();
  2060. }
  2061. var backgroundImageURL = currentBackground.style.backgroundImage || '';
  2062. // Restart GIFs (doesn't work in Firefox)
  2063. if( /\.gif/i.test( backgroundImageURL ) ) {
  2064. currentBackground.style.backgroundImage = '';
  2065. window.getComputedStyle( currentBackground ).opacity;
  2066. currentBackground.style.backgroundImage = backgroundImageURL;
  2067. }
  2068. // Don't transition between identical backgrounds. This
  2069. // prevents unwanted flicker.
  2070. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2071. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2072. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2073. dom.background.classList.add( 'no-transition' );
  2074. }
  2075. previousBackground = currentBackground;
  2076. }
  2077. // If there's a background brightness flag for this slide,
  2078. // bubble it to the .reveal container
  2079. if( currentSlide ) {
  2080. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2081. if( currentSlide.classList.contains( classToBubble ) ) {
  2082. dom.wrapper.classList.add( classToBubble );
  2083. }
  2084. else {
  2085. dom.wrapper.classList.remove( classToBubble );
  2086. }
  2087. } );
  2088. }
  2089. // Allow the first background to apply without transition
  2090. setTimeout( function() {
  2091. dom.background.classList.remove( 'no-transition' );
  2092. }, 1 );
  2093. }
  2094. /**
  2095. * Updates the position of the parallax background based
  2096. * on the current slide index.
  2097. */
  2098. function updateParallax() {
  2099. if( config.parallaxBackgroundImage ) {
  2100. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2101. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2102. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2103. backgroundWidth, backgroundHeight;
  2104. if( backgroundSize.length === 1 ) {
  2105. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2106. }
  2107. else {
  2108. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2109. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2110. }
  2111. var slideWidth = dom.background.offsetWidth,
  2112. horizontalSlideCount = horizontalSlides.length,
  2113. horizontalOffsetMultiplier,
  2114. horizontalOffset;
  2115. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2116. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2117. }
  2118. else {
  2119. horizontalOffsetMultiplier = ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 );
  2120. }
  2121. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2122. var slideHeight = dom.background.offsetHeight,
  2123. verticalSlideCount = verticalSlides.length,
  2124. verticalOffsetMultiplier,
  2125. verticalOffset;
  2126. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2127. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2128. }
  2129. else {
  2130. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2131. }
  2132. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv * 1 : 0;
  2133. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2134. }
  2135. }
  2136. /**
  2137. * Called when the given slide is within the configured view
  2138. * distance. Shows the slide element and loads any content
  2139. * that is set to load lazily (data-src).
  2140. */
  2141. function showSlide( slide ) {
  2142. // Show the slide element
  2143. slide.style.display = 'block';
  2144. // Media elements with data-src attributes
  2145. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) {
  2146. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2147. element.removeAttribute( 'data-src' );
  2148. } );
  2149. // Media elements with <source> children
  2150. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2151. var sources = 0;
  2152. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2153. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2154. source.removeAttribute( 'data-src' );
  2155. sources += 1;
  2156. } );
  2157. // If we rewrote sources for this video/audio element, we need
  2158. // to manually tell it to load from its new origin
  2159. if( sources > 0 ) {
  2160. media.load();
  2161. }
  2162. } );
  2163. // Show the corresponding background element
  2164. var indices = getIndices( slide );
  2165. var background = getSlideBackground( indices.h, indices.v );
  2166. if( background ) {
  2167. background.style.display = 'block';
  2168. // If the background contains media, load it
  2169. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2170. background.setAttribute( 'data-loaded', 'true' );
  2171. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2172. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2173. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2174. backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2175. // Images
  2176. if( backgroundImage ) {
  2177. background.style.backgroundImage = 'url('+ backgroundImage +')';
  2178. }
  2179. // Videos
  2180. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2181. var video = document.createElement( 'video' );
  2182. if( backgroundVideoLoop ) {
  2183. video.setAttribute( 'loop', '' );
  2184. }
  2185. // Support comma separated lists of video sources
  2186. backgroundVideo.split( ',' ).forEach( function( source ) {
  2187. video.innerHTML += '<source src="'+ source +'">';
  2188. } );
  2189. background.appendChild( video );
  2190. }
  2191. // Iframes
  2192. else if( backgroundIframe ) {
  2193. var iframe = document.createElement( 'iframe' );
  2194. iframe.setAttribute( 'src', backgroundIframe );
  2195. iframe.style.width = '100%';
  2196. iframe.style.height = '100%';
  2197. iframe.style.maxHeight = '100%';
  2198. iframe.style.maxWidth = '100%';
  2199. background.appendChild( iframe );
  2200. }
  2201. }
  2202. }
  2203. }
  2204. /**
  2205. * Called when the given slide is moved outside of the
  2206. * configured view distance.
  2207. */
  2208. function hideSlide( slide ) {
  2209. // Hide the slide element
  2210. slide.style.display = 'none';
  2211. // Hide the corresponding background element
  2212. var indices = getIndices( slide );
  2213. var background = getSlideBackground( indices.h, indices.v );
  2214. if( background ) {
  2215. background.style.display = 'none';
  2216. }
  2217. }
  2218. /**
  2219. * Determine what available routes there are for navigation.
  2220. *
  2221. * @return {Object} containing four booleans: left/right/up/down
  2222. */
  2223. function availableRoutes() {
  2224. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2225. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2226. var routes = {
  2227. left: indexh > 0 || config.loop,
  2228. right: indexh < horizontalSlides.length - 1 || config.loop,
  2229. up: indexv > 0,
  2230. down: indexv < verticalSlides.length - 1
  2231. };
  2232. // reverse horizontal controls for rtl
  2233. if( config.rtl ) {
  2234. var left = routes.left;
  2235. routes.left = routes.right;
  2236. routes.right = left;
  2237. }
  2238. return routes;
  2239. }
  2240. /**
  2241. * Returns an object describing the available fragment
  2242. * directions.
  2243. *
  2244. * @return {Object} two boolean properties: prev/next
  2245. */
  2246. function availableFragments() {
  2247. if( currentSlide && config.fragments ) {
  2248. var fragments = currentSlide.querySelectorAll( '.fragment' );
  2249. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  2250. return {
  2251. prev: fragments.length - hiddenFragments.length > 0,
  2252. next: !!hiddenFragments.length
  2253. };
  2254. }
  2255. else {
  2256. return { prev: false, next: false };
  2257. }
  2258. }
  2259. /**
  2260. * Enforces origin-specific format rules for embedded media.
  2261. */
  2262. function formatEmbeddedContent() {
  2263. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  2264. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  2265. var src = el.getAttribute( sourceAttribute );
  2266. if( src && src.indexOf( param ) === -1 ) {
  2267. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  2268. }
  2269. });
  2270. };
  2271. // YouTube frames must include "?enablejsapi=1"
  2272. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  2273. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  2274. // Vimeo frames must include "?api=1"
  2275. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  2276. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  2277. }
  2278. /**
  2279. * Start playback of any embedded content inside of
  2280. * the targeted slide.
  2281. */
  2282. function startEmbeddedContent( slide ) {
  2283. if( slide && !isSpeakerNotes() ) {
  2284. // Restart GIFs
  2285. toArray( slide.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  2286. // Setting the same unchanged source like this was confirmed
  2287. // to work in Chrome, FF & Safari
  2288. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  2289. } );
  2290. // HTML5 media elements
  2291. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2292. if( el.hasAttribute( 'data-autoplay' ) && typeof el.play === 'function' ) {
  2293. el.play();
  2294. }
  2295. } );
  2296. // Normal iframes
  2297. toArray( slide.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  2298. startEmbeddedIframe( { target: el } );
  2299. } );
  2300. // Lazy loading iframes
  2301. toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  2302. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  2303. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  2304. el.addEventListener( 'load', startEmbeddedIframe );
  2305. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  2306. }
  2307. } );
  2308. }
  2309. }
  2310. /**
  2311. * "Starts" the content of an embedded iframe using the
  2312. * postmessage API.
  2313. */
  2314. function startEmbeddedIframe( event ) {
  2315. var iframe = event.target;
  2316. // YouTube postMessage API
  2317. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
  2318. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  2319. }
  2320. // Vimeo postMessage API
  2321. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
  2322. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  2323. }
  2324. // Generic postMessage API
  2325. else {
  2326. iframe.contentWindow.postMessage( 'slide:start', '*' );
  2327. }
  2328. }
  2329. /**
  2330. * Stop playback of any embedded content inside of
  2331. * the targeted slide.
  2332. */
  2333. function stopEmbeddedContent( slide ) {
  2334. if( slide && slide.parentNode ) {
  2335. // HTML5 media elements
  2336. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2337. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  2338. el.pause();
  2339. }
  2340. } );
  2341. // Generic postMessage API for non-lazy loaded iframes
  2342. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  2343. el.contentWindow.postMessage( 'slide:stop', '*' );
  2344. el.removeEventListener( 'load', startEmbeddedIframe );
  2345. });
  2346. // YouTube postMessage API
  2347. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  2348. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  2349. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  2350. }
  2351. });
  2352. // Vimeo postMessage API
  2353. toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  2354. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  2355. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  2356. }
  2357. });
  2358. // Lazy loading iframes
  2359. toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  2360. // Only removing the src doesn't actually unload the frame
  2361. // in all browsers (Firefox) so we set it to blank first
  2362. el.setAttribute( 'src', 'about:blank' );
  2363. el.removeAttribute( 'src' );
  2364. } );
  2365. }
  2366. }
  2367. /**
  2368. * Returns the number of past slides. This can be used as a global
  2369. * flattened index for slides.
  2370. */
  2371. function getSlidePastCount() {
  2372. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2373. // The number of past slides
  2374. var pastCount = 0;
  2375. // Step through all slides and count the past ones
  2376. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  2377. var horizontalSlide = horizontalSlides[i];
  2378. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2379. for( var j = 0; j < verticalSlides.length; j++ ) {
  2380. // Stop as soon as we arrive at the present
  2381. if( verticalSlides[j].classList.contains( 'present' ) ) {
  2382. break mainLoop;
  2383. }
  2384. pastCount++;
  2385. }
  2386. // Stop as soon as we arrive at the present
  2387. if( horizontalSlide.classList.contains( 'present' ) ) {
  2388. break;
  2389. }
  2390. // Don't count the wrapping section for vertical slides
  2391. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  2392. pastCount++;
  2393. }
  2394. }
  2395. return pastCount;
  2396. }
  2397. /**
  2398. * Returns a value ranging from 0-1 that represents
  2399. * how far into the presentation we have navigated.
  2400. */
  2401. function getProgress() {
  2402. // The number of past and total slides
  2403. var totalCount = getTotalSlides();
  2404. var pastCount = getSlidePastCount();
  2405. if( currentSlide ) {
  2406. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  2407. // If there are fragments in the current slide those should be
  2408. // accounted for in the progress.
  2409. if( allFragments.length > 0 ) {
  2410. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  2411. // This value represents how big a portion of the slide progress
  2412. // that is made up by its fragments (0-1)
  2413. var fragmentWeight = 0.9;
  2414. // Add fragment progress to the past slide count
  2415. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  2416. }
  2417. }
  2418. return pastCount / ( totalCount - 1 );
  2419. }
  2420. /**
  2421. * Checks if this presentation is running inside of the
  2422. * speaker notes window.
  2423. */
  2424. function isSpeakerNotes() {
  2425. return !!window.location.search.match( /receiver/gi );
  2426. }
  2427. /**
  2428. * Reads the current URL (hash) and navigates accordingly.
  2429. */
  2430. function readURL() {
  2431. var hash = window.location.hash;
  2432. // Attempt to parse the hash as either an index or name
  2433. var bits = hash.slice( 2 ).split( '/' ),
  2434. name = hash.replace( /#|\//gi, '' );
  2435. // If the first bit is invalid and there is a name we can
  2436. // assume that this is a named link
  2437. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  2438. var element;
  2439. // Ensure the named link is a valid HTML ID attribute
  2440. if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) {
  2441. // Find the slide with the specified ID
  2442. element = document.getElementById( name );
  2443. }
  2444. if( element ) {
  2445. // Find the position of the named slide and navigate to it
  2446. var indices = Reveal.getIndices( element );
  2447. slide( indices.h, indices.v );
  2448. }
  2449. // If the slide doesn't exist, navigate to the current slide
  2450. else {
  2451. slide( indexh || 0, indexv || 0 );
  2452. }
  2453. }
  2454. else {
  2455. // Read the index components of the hash
  2456. var h = parseInt( bits[0], 10 ) || 0,
  2457. v = parseInt( bits[1], 10 ) || 0;
  2458. if( h !== indexh || v !== indexv ) {
  2459. slide( h, v );
  2460. }
  2461. }
  2462. }
  2463. /**
  2464. * Updates the page URL (hash) to reflect the current
  2465. * state.
  2466. *
  2467. * @param {Number} delay The time in ms to wait before
  2468. * writing the hash
  2469. */
  2470. function writeURL( delay ) {
  2471. if( config.history ) {
  2472. // Make sure there's never more than one timeout running
  2473. clearTimeout( writeURLTimeout );
  2474. // If a delay is specified, timeout this call
  2475. if( typeof delay === 'number' ) {
  2476. writeURLTimeout = setTimeout( writeURL, delay );
  2477. }
  2478. else if( currentSlide ) {
  2479. var url = '/';
  2480. // Attempt to create a named link based on the slide's ID
  2481. var id = currentSlide.getAttribute( 'id' );
  2482. if( id ) {
  2483. id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
  2484. }
  2485. // If the current slide has an ID, use that as a named link
  2486. if( typeof id === 'string' && id.length ) {
  2487. url = '/' + id;
  2488. }
  2489. // Otherwise use the /h/v index
  2490. else {
  2491. if( indexh > 0 || indexv > 0 ) url += indexh;
  2492. if( indexv > 0 ) url += '/' + indexv;
  2493. }
  2494. window.location.hash = url;
  2495. }
  2496. }
  2497. }
  2498. /**
  2499. * Retrieves the h/v location of the current, or specified,
  2500. * slide.
  2501. *
  2502. * @param {HTMLElement} slide If specified, the returned
  2503. * index will be for this slide rather than the currently
  2504. * active one
  2505. *
  2506. * @return {Object} { h: <int>, v: <int>, f: <int> }
  2507. */
  2508. function getIndices( slide ) {
  2509. // By default, return the current indices
  2510. var h = indexh,
  2511. v = indexv,
  2512. f;
  2513. // If a slide is specified, return the indices of that slide
  2514. if( slide ) {
  2515. var isVertical = isVerticalSlide( slide );
  2516. var slideh = isVertical ? slide.parentNode : slide;
  2517. // Select all horizontal slides
  2518. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2519. // Now that we know which the horizontal slide is, get its index
  2520. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  2521. // Assume we're not vertical
  2522. v = undefined;
  2523. // If this is a vertical slide, grab the vertical index
  2524. if( isVertical ) {
  2525. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  2526. }
  2527. }
  2528. if( !slide && currentSlide ) {
  2529. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  2530. if( hasFragments ) {
  2531. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2532. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  2533. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  2534. }
  2535. else {
  2536. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  2537. }
  2538. }
  2539. }
  2540. return { h: h, v: v, f: f };
  2541. }
  2542. /**
  2543. * Retrieves the total number of slides in this presentation.
  2544. */
  2545. function getTotalSlides() {
  2546. return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  2547. }
  2548. /**
  2549. * Returns the slide element matching the specified index.
  2550. */
  2551. function getSlide( x, y ) {
  2552. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2553. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2554. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  2555. return verticalSlides ? verticalSlides[ y ] : undefined;
  2556. }
  2557. return horizontalSlide;
  2558. }
  2559. /**
  2560. * Returns the background element for the given slide.
  2561. * All slides, even the ones with no background properties
  2562. * defined, have a background element so as long as the
  2563. * index is valid an element will be returned.
  2564. */
  2565. function getSlideBackground( x, y ) {
  2566. // When printing to PDF the slide backgrounds are nested
  2567. // inside of the slides
  2568. if( isPrintingPDF() ) {
  2569. var slide = getSlide( x, y );
  2570. if( slide ) {
  2571. var background = slide.querySelector( '.slide-background' );
  2572. if( background && background.parentNode === slide ) {
  2573. return background;
  2574. }
  2575. }
  2576. return undefined;
  2577. }
  2578. var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
  2579. var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
  2580. if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
  2581. return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
  2582. }
  2583. return horizontalBackground;
  2584. }
  2585. /**
  2586. * Retrieves the speaker notes from a slide. Notes can be
  2587. * defined in two ways:
  2588. * 1. As a data-notes attribute on the slide <section>
  2589. * 2. As an <aside class="notes"> inside of the slide
  2590. */
  2591. function getSlideNotes( slide ) {
  2592. // Default to the current slide
  2593. slide = slide || currentSlide;
  2594. // Notes can be specified via the data-notes attribute...
  2595. if( slide.hasAttribute( 'data-notes' ) ) {
  2596. return slide.getAttribute( 'data-notes' );
  2597. }
  2598. // ... or using an <aside class="notes"> element
  2599. var notesElement = slide.querySelector( 'aside.notes' );
  2600. if( notesElement ) {
  2601. return notesElement.innerHTML;
  2602. }
  2603. return null;
  2604. }
  2605. /**
  2606. * Retrieves the current state of the presentation as
  2607. * an object. This state can then be restored at any
  2608. * time.
  2609. */
  2610. function getState() {
  2611. var indices = getIndices();
  2612. return {
  2613. indexh: indices.h,
  2614. indexv: indices.v,
  2615. indexf: indices.f,
  2616. paused: isPaused(),
  2617. overview: isOverview()
  2618. };
  2619. }
  2620. /**
  2621. * Restores the presentation to the given state.
  2622. *
  2623. * @param {Object} state As generated by getState()
  2624. */
  2625. function setState( state ) {
  2626. if( typeof state === 'object' ) {
  2627. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  2628. var pausedFlag = deserialize( state.paused ),
  2629. overviewFlag = deserialize( state.overview );
  2630. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  2631. togglePause( pausedFlag );
  2632. }
  2633. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  2634. toggleOverview( overviewFlag );
  2635. }
  2636. }
  2637. }
  2638. /**
  2639. * Return a sorted fragments list, ordered by an increasing
  2640. * "data-fragment-index" attribute.
  2641. *
  2642. * Fragments will be revealed in the order that they are returned by
  2643. * this function, so you can use the index attributes to control the
  2644. * order of fragment appearance.
  2645. *
  2646. * To maintain a sensible default fragment order, fragments are presumed
  2647. * to be passed in document order. This function adds a "fragment-index"
  2648. * attribute to each node if such an attribute is not already present,
  2649. * and sets that attribute to an integer value which is the position of
  2650. * the fragment within the fragments list.
  2651. */
  2652. function sortFragments( fragments ) {
  2653. fragments = toArray( fragments );
  2654. var ordered = [],
  2655. unordered = [],
  2656. sorted = [];
  2657. // Group ordered and unordered elements
  2658. fragments.forEach( function( fragment, i ) {
  2659. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  2660. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  2661. if( !ordered[index] ) {
  2662. ordered[index] = [];
  2663. }
  2664. ordered[index].push( fragment );
  2665. }
  2666. else {
  2667. unordered.push( [ fragment ] );
  2668. }
  2669. } );
  2670. // Append fragments without explicit indices in their
  2671. // DOM order
  2672. ordered = ordered.concat( unordered );
  2673. // Manually count the index up per group to ensure there
  2674. // are no gaps
  2675. var index = 0;
  2676. // Push all fragments in their sorted order to an array,
  2677. // this flattens the groups
  2678. ordered.forEach( function( group ) {
  2679. group.forEach( function( fragment ) {
  2680. sorted.push( fragment );
  2681. fragment.setAttribute( 'data-fragment-index', index );
  2682. } );
  2683. index ++;
  2684. } );
  2685. return sorted;
  2686. }
  2687. /**
  2688. * Navigate to the specified slide fragment.
  2689. *
  2690. * @param {Number} index The index of the fragment that
  2691. * should be shown, -1 means all are invisible
  2692. * @param {Number} offset Integer offset to apply to the
  2693. * fragment index
  2694. *
  2695. * @return {Boolean} true if a change was made in any
  2696. * fragments visibility as part of this call
  2697. */
  2698. function navigateFragment( index, offset ) {
  2699. if( currentSlide && config.fragments ) {
  2700. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  2701. if( fragments.length ) {
  2702. // If no index is specified, find the current
  2703. if( typeof index !== 'number' ) {
  2704. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  2705. if( lastVisibleFragment ) {
  2706. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  2707. }
  2708. else {
  2709. index = -1;
  2710. }
  2711. }
  2712. // If an offset is specified, apply it to the index
  2713. if( typeof offset === 'number' ) {
  2714. index += offset;
  2715. }
  2716. var fragmentsShown = [],
  2717. fragmentsHidden = [];
  2718. toArray( fragments ).forEach( function( element, i ) {
  2719. if( element.hasAttribute( 'data-fragment-index' ) ) {
  2720. i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
  2721. }
  2722. // Visible fragments
  2723. if( i <= index ) {
  2724. if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
  2725. element.classList.add( 'visible' );
  2726. element.classList.remove( 'current-fragment' );
  2727. // Announce the fragments one by one to the Screen Reader
  2728. dom.statusDiv.textContent = element.textContent;
  2729. if( i === index ) {
  2730. element.classList.add( 'current-fragment' );
  2731. }
  2732. }
  2733. // Hidden fragments
  2734. else {
  2735. if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
  2736. element.classList.remove( 'visible' );
  2737. element.classList.remove( 'current-fragment' );
  2738. }
  2739. } );
  2740. if( fragmentsHidden.length ) {
  2741. dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
  2742. }
  2743. if( fragmentsShown.length ) {
  2744. dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
  2745. }
  2746. updateControls();
  2747. updateProgress();
  2748. return !!( fragmentsShown.length || fragmentsHidden.length );
  2749. }
  2750. }
  2751. return false;
  2752. }
  2753. /**
  2754. * Navigate to the next slide fragment.
  2755. *
  2756. * @return {Boolean} true if there was a next fragment,
  2757. * false otherwise
  2758. */
  2759. function nextFragment() {
  2760. return navigateFragment( null, 1 );
  2761. }
  2762. /**
  2763. * Navigate to the previous slide fragment.
  2764. *
  2765. * @return {Boolean} true if there was a previous fragment,
  2766. * false otherwise
  2767. */
  2768. function previousFragment() {
  2769. return navigateFragment( null, -1 );
  2770. }
  2771. /**
  2772. * Cues a new automated slide if enabled in the config.
  2773. */
  2774. function cueAutoSlide() {
  2775. cancelAutoSlide();
  2776. if( currentSlide ) {
  2777. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2778. var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null;
  2779. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  2780. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  2781. // Pick value in the following priority order:
  2782. // 1. Current fragment's data-autoslide
  2783. // 2. Current slide's data-autoslide
  2784. // 3. Parent slide's data-autoslide
  2785. // 4. Global autoSlide setting
  2786. if( fragmentAutoSlide ) {
  2787. autoSlide = parseInt( fragmentAutoSlide, 10 );
  2788. }
  2789. else if( slideAutoSlide ) {
  2790. autoSlide = parseInt( slideAutoSlide, 10 );
  2791. }
  2792. else if( parentAutoSlide ) {
  2793. autoSlide = parseInt( parentAutoSlide, 10 );
  2794. }
  2795. else {
  2796. autoSlide = config.autoSlide;
  2797. }
  2798. // If there are media elements with data-autoplay,
  2799. // automatically set the autoSlide duration to the
  2800. // length of that media. Not applicable if the slide
  2801. // is divided up into fragments.
  2802. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  2803. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2804. if( el.hasAttribute( 'data-autoplay' ) ) {
  2805. if( autoSlide && el.duration * 1000 > autoSlide ) {
  2806. autoSlide = ( el.duration * 1000 ) + 1000;
  2807. }
  2808. }
  2809. } );
  2810. }
  2811. // Cue the next auto-slide if:
  2812. // - There is an autoSlide value
  2813. // - Auto-sliding isn't paused by the user
  2814. // - The presentation isn't paused
  2815. // - The overview isn't active
  2816. // - The presentation isn't over
  2817. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  2818. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  2819. autoSlideStartTime = Date.now();
  2820. }
  2821. if( autoSlidePlayer ) {
  2822. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  2823. }
  2824. }
  2825. }
  2826. /**
  2827. * Cancels any ongoing request to auto-slide.
  2828. */
  2829. function cancelAutoSlide() {
  2830. clearTimeout( autoSlideTimeout );
  2831. autoSlideTimeout = -1;
  2832. }
  2833. function pauseAutoSlide() {
  2834. if( autoSlide && !autoSlidePaused ) {
  2835. autoSlidePaused = true;
  2836. dispatchEvent( 'autoslidepaused' );
  2837. clearTimeout( autoSlideTimeout );
  2838. if( autoSlidePlayer ) {
  2839. autoSlidePlayer.setPlaying( false );
  2840. }
  2841. }
  2842. }
  2843. function resumeAutoSlide() {
  2844. if( autoSlide && autoSlidePaused ) {
  2845. autoSlidePaused = false;
  2846. dispatchEvent( 'autoslideresumed' );
  2847. cueAutoSlide();
  2848. }
  2849. }
  2850. function navigateLeft() {
  2851. // Reverse for RTL
  2852. if( config.rtl ) {
  2853. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  2854. slide( indexh + 1 );
  2855. }
  2856. }
  2857. // Normal navigation
  2858. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  2859. slide( indexh - 1 );
  2860. }
  2861. }
  2862. function navigateRight() {
  2863. // Reverse for RTL
  2864. if( config.rtl ) {
  2865. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  2866. slide( indexh - 1 );
  2867. }
  2868. }
  2869. // Normal navigation
  2870. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  2871. slide( indexh + 1 );
  2872. }
  2873. }
  2874. function navigateUp() {
  2875. // Prioritize hiding fragments
  2876. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  2877. slide( indexh, indexv - 1 );
  2878. }
  2879. }
  2880. function navigateDown() {
  2881. // Prioritize revealing fragments
  2882. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  2883. slide( indexh, indexv + 1 );
  2884. }
  2885. }
  2886. /**
  2887. * Navigates backwards, prioritized in the following order:
  2888. * 1) Previous fragment
  2889. * 2) Previous vertical slide
  2890. * 3) Previous horizontal slide
  2891. */
  2892. function navigatePrev() {
  2893. // Prioritize revealing fragments
  2894. if( previousFragment() === false ) {
  2895. if( availableRoutes().up ) {
  2896. navigateUp();
  2897. }
  2898. else {
  2899. // Fetch the previous horizontal slide, if there is one
  2900. var previousSlide;
  2901. if( config.rtl ) {
  2902. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  2903. }
  2904. else {
  2905. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  2906. }
  2907. if( previousSlide ) {
  2908. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  2909. var h = indexh - 1;
  2910. slide( h, v );
  2911. }
  2912. }
  2913. }
  2914. }
  2915. /**
  2916. * The reverse of #navigatePrev().
  2917. */
  2918. function navigateNext() {
  2919. // Prioritize revealing fragments
  2920. if( nextFragment() === false ) {
  2921. if( availableRoutes().down ) {
  2922. navigateDown();
  2923. }
  2924. else if( config.rtl ) {
  2925. navigateLeft();
  2926. }
  2927. else {
  2928. navigateRight();
  2929. }
  2930. }
  2931. // If auto-sliding is enabled we need to cue up
  2932. // another timeout
  2933. cueAutoSlide();
  2934. }
  2935. // --------------------------------------------------------------------//
  2936. // ----------------------------- EVENTS -------------------------------//
  2937. // --------------------------------------------------------------------//
  2938. /**
  2939. * Called by all event handlers that are based on user
  2940. * input.
  2941. */
  2942. function onUserInput( event ) {
  2943. if( config.autoSlideStoppable ) {
  2944. pauseAutoSlide();
  2945. }
  2946. }
  2947. /**
  2948. * Handler for the document level 'keypress' event.
  2949. */
  2950. function onDocumentKeyPress( event ) {
  2951. // Check if the pressed key is question mark
  2952. if( event.shiftKey && event.charCode === 63 ) {
  2953. if( dom.overlay ) {
  2954. closeOverlay();
  2955. }
  2956. else {
  2957. showHelp( true );
  2958. }
  2959. }
  2960. }
  2961. /**
  2962. * Handler for the document level 'keydown' event.
  2963. */
  2964. function onDocumentKeyDown( event ) {
  2965. // If there's a condition specified and it returns false,
  2966. // ignore this event
  2967. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
  2968. return true;
  2969. }
  2970. // Remember if auto-sliding was paused so we can toggle it
  2971. var autoSlideWasPaused = autoSlidePaused;
  2972. onUserInput( event );
  2973. // Check if there's a focused element that could be using
  2974. // the keyboard
  2975. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  2976. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  2977. // Disregard the event if there's a focused element or a
  2978. // keyboard modifier key is present
  2979. if( activeElementIsCE || activeElementIsInput || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  2980. // While paused only allow resume keyboard events; 'b', '.''
  2981. var resumeKeyCodes = [66,190,191];
  2982. var key;
  2983. // Custom key bindings for togglePause should be able to resume
  2984. if( typeof config.keyboard === 'object' ) {
  2985. for( key in config.keyboard ) {
  2986. if( config.keyboard[key] === 'togglePause' ) {
  2987. resumeKeyCodes.push( parseInt( key, 10 ) );
  2988. }
  2989. }
  2990. }
  2991. if( isPaused() && resumeKeyCodes.indexOf( event.keyCode ) === -1 ) {
  2992. return false;
  2993. }
  2994. var triggered = false;
  2995. // 1. User defined key bindings
  2996. if( typeof config.keyboard === 'object' ) {
  2997. for( key in config.keyboard ) {
  2998. // Check if this binding matches the pressed key
  2999. if( parseInt( key, 10 ) === event.keyCode ) {
  3000. var value = config.keyboard[ key ];
  3001. // Callback function
  3002. if( typeof value === 'function' ) {
  3003. value.apply( null, [ event ] );
  3004. }
  3005. // String shortcuts to reveal.js API
  3006. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  3007. Reveal[ value ].call();
  3008. }
  3009. triggered = true;
  3010. }
  3011. }
  3012. }
  3013. // 2. System defined key bindings
  3014. if( triggered === false ) {
  3015. // Assume true and try to prove false
  3016. triggered = true;
  3017. switch( event.keyCode ) {
  3018. // p, page up
  3019. case 80: case 33: navigatePrev(); break;
  3020. // n, page down
  3021. case 78: case 34: navigateNext(); break;
  3022. // h, left
  3023. case 72: case 37: navigateLeft(); break;
  3024. // l, right
  3025. case 76: case 39: navigateRight(); break;
  3026. // k, up
  3027. case 75: case 38: navigateUp(); break;
  3028. // j, down
  3029. case 74: case 40: navigateDown(); break;
  3030. // home
  3031. case 36: slide( 0 ); break;
  3032. // end
  3033. case 35: slide( Number.MAX_VALUE ); break;
  3034. // space
  3035. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  3036. // return
  3037. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  3038. // two-spot, semicolon, b, period, Logitech presenter tools "black screen" button
  3039. case 58: case 59: case 66: case 190: case 191: togglePause(); break;
  3040. // f
  3041. case 70: enterFullscreen(); break;
  3042. // a
  3043. case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
  3044. default:
  3045. triggered = false;
  3046. }
  3047. }
  3048. // If the input resulted in a triggered action we should prevent
  3049. // the browsers default behavior
  3050. if( triggered ) {
  3051. event.preventDefault && event.preventDefault();
  3052. }
  3053. // ESC or O key
  3054. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  3055. if( dom.overlay ) {
  3056. closeOverlay();
  3057. }
  3058. else {
  3059. toggleOverview();
  3060. }
  3061. event.preventDefault && event.preventDefault();
  3062. }
  3063. // If auto-sliding is enabled we need to cue up
  3064. // another timeout
  3065. cueAutoSlide();
  3066. }
  3067. /**
  3068. * Handler for the 'touchstart' event, enables support for
  3069. * swipe and pinch gestures.
  3070. */
  3071. function onTouchStart( event ) {
  3072. touch.startX = event.touches[0].clientX;
  3073. touch.startY = event.touches[0].clientY;
  3074. touch.startCount = event.touches.length;
  3075. // If there's two touches we need to memorize the distance
  3076. // between those two points to detect pinching
  3077. if( event.touches.length === 2 && config.overview ) {
  3078. touch.startSpan = distanceBetween( {
  3079. x: event.touches[1].clientX,
  3080. y: event.touches[1].clientY
  3081. }, {
  3082. x: touch.startX,
  3083. y: touch.startY
  3084. } );
  3085. }
  3086. }
  3087. /**
  3088. * Handler for the 'touchmove' event.
  3089. */
  3090. function onTouchMove( event ) {
  3091. // Each touch should only trigger one action
  3092. if( !touch.captured ) {
  3093. onUserInput( event );
  3094. var currentX = event.touches[0].clientX;
  3095. var currentY = event.touches[0].clientY;
  3096. // If the touch started with two points and still has
  3097. // two active touches; test for the pinch gesture
  3098. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  3099. // The current distance in pixels between the two touch points
  3100. var currentSpan = distanceBetween( {
  3101. x: event.touches[1].clientX,
  3102. y: event.touches[1].clientY
  3103. }, {
  3104. x: touch.startX,
  3105. y: touch.startY
  3106. } );
  3107. // If the span is larger than the desire amount we've got
  3108. // ourselves a pinch
  3109. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  3110. touch.captured = true;
  3111. if( currentSpan < touch.startSpan ) {
  3112. activateOverview();
  3113. }
  3114. else {
  3115. deactivateOverview();
  3116. }
  3117. }
  3118. event.preventDefault();
  3119. }
  3120. // There was only one touch point, look for a swipe
  3121. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  3122. var deltaX = currentX - touch.startX,
  3123. deltaY = currentY - touch.startY;
  3124. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  3125. touch.captured = true;
  3126. navigateLeft();
  3127. }
  3128. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  3129. touch.captured = true;
  3130. navigateRight();
  3131. }
  3132. else if( deltaY > touch.threshold ) {
  3133. touch.captured = true;
  3134. navigateUp();
  3135. }
  3136. else if( deltaY < -touch.threshold ) {
  3137. touch.captured = true;
  3138. navigateDown();
  3139. }
  3140. // If we're embedded, only block touch events if they have
  3141. // triggered an action
  3142. if( config.embedded ) {
  3143. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  3144. event.preventDefault();
  3145. }
  3146. }
  3147. // Not embedded? Block them all to avoid needless tossing
  3148. // around of the viewport in iOS
  3149. else {
  3150. event.preventDefault();
  3151. }
  3152. }
  3153. }
  3154. // There's a bug with swiping on some Android devices unless
  3155. // the default action is always prevented
  3156. else if( navigator.userAgent.match( /android/gi ) ) {
  3157. event.preventDefault();
  3158. }
  3159. }
  3160. /**
  3161. * Handler for the 'touchend' event.
  3162. */
  3163. function onTouchEnd( event ) {
  3164. touch.captured = false;
  3165. }
  3166. /**
  3167. * Convert pointer down to touch start.
  3168. */
  3169. function onPointerDown( event ) {
  3170. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  3171. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  3172. onTouchStart( event );
  3173. }
  3174. }
  3175. /**
  3176. * Convert pointer move to touch move.
  3177. */
  3178. function onPointerMove( event ) {
  3179. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  3180. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  3181. onTouchMove( event );
  3182. }
  3183. }
  3184. /**
  3185. * Convert pointer up to touch end.
  3186. */
  3187. function onPointerUp( event ) {
  3188. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  3189. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  3190. onTouchEnd( event );
  3191. }
  3192. }
  3193. /**
  3194. * Handles mouse wheel scrolling, throttled to avoid skipping
  3195. * multiple slides.
  3196. */
  3197. function onDocumentMouseScroll( event ) {
  3198. if( Date.now() - lastMouseWheelStep > 600 ) {
  3199. lastMouseWheelStep = Date.now();
  3200. var delta = event.detail || -event.wheelDelta;
  3201. if( delta > 0 ) {
  3202. navigateNext();
  3203. }
  3204. else {
  3205. navigatePrev();
  3206. }
  3207. }
  3208. }
  3209. /**
  3210. * Clicking on the progress bar results in a navigation to the
  3211. * closest approximate horizontal slide using this equation:
  3212. *
  3213. * ( clickX / presentationWidth ) * numberOfSlides
  3214. */
  3215. function onProgressClicked( event ) {
  3216. onUserInput( event );
  3217. event.preventDefault();
  3218. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  3219. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  3220. if( config.rtl ) {
  3221. slideIndex = slidesTotal - slideIndex;
  3222. }
  3223. slide( slideIndex );
  3224. }
  3225. /**
  3226. * Event handler for navigation control buttons.
  3227. */
  3228. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  3229. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  3230. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  3231. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  3232. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  3233. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  3234. /**
  3235. * Handler for the window level 'hashchange' event.
  3236. */
  3237. function onWindowHashChange( event ) {
  3238. readURL();
  3239. }
  3240. /**
  3241. * Handler for the window level 'resize' event.
  3242. */
  3243. function onWindowResize( event ) {
  3244. layout();
  3245. }
  3246. /**
  3247. * Handle for the window level 'visibilitychange' event.
  3248. */
  3249. function onPageVisibilityChange( event ) {
  3250. var isHidden = document.webkitHidden ||
  3251. document.msHidden ||
  3252. document.hidden;
  3253. // If, after clicking a link or similar and we're coming back,
  3254. // focus the document.body to ensure we can use keyboard shortcuts
  3255. if( isHidden === false && document.activeElement !== document.body ) {
  3256. // Not all elements support .blur() - SVGs among them.
  3257. if( typeof document.activeElement.blur === 'function' ) {
  3258. document.activeElement.blur();
  3259. }
  3260. document.body.focus();
  3261. }
  3262. }
  3263. /**
  3264. * Invoked when a slide is and we're in the overview.
  3265. */
  3266. function onOverviewSlideClicked( event ) {
  3267. // TODO There's a bug here where the event listeners are not
  3268. // removed after deactivating the overview.
  3269. if( eventsAreBound && isOverview() ) {
  3270. event.preventDefault();
  3271. var element = event.target;
  3272. while( element && !element.nodeName.match( /section/gi ) ) {
  3273. element = element.parentNode;
  3274. }
  3275. if( element && !element.classList.contains( 'disabled' ) ) {
  3276. deactivateOverview();
  3277. if( element.nodeName.match( /section/gi ) ) {
  3278. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  3279. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  3280. slide( h, v );
  3281. }
  3282. }
  3283. }
  3284. }
  3285. /**
  3286. * Handles clicks on links that are set to preview in the
  3287. * iframe overlay.
  3288. */
  3289. function onPreviewLinkClicked( event ) {
  3290. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  3291. var url = event.currentTarget.getAttribute( 'href' );
  3292. if( url ) {
  3293. showPreview( url );
  3294. event.preventDefault();
  3295. }
  3296. }
  3297. }
  3298. /**
  3299. * Handles click on the auto-sliding controls element.
  3300. */
  3301. function onAutoSlidePlayerClick( event ) {
  3302. // Replay
  3303. if( Reveal.isLastSlide() && config.loop === false ) {
  3304. slide( 0, 0 );
  3305. resumeAutoSlide();
  3306. }
  3307. // Resume
  3308. else if( autoSlidePaused ) {
  3309. resumeAutoSlide();
  3310. }
  3311. // Pause
  3312. else {
  3313. pauseAutoSlide();
  3314. }
  3315. }
  3316. // --------------------------------------------------------------------//
  3317. // ------------------------ PLAYBACK COMPONENT ------------------------//
  3318. // --------------------------------------------------------------------//
  3319. /**
  3320. * Constructor for the playback component, which displays
  3321. * play/pause/progress controls.
  3322. *
  3323. * @param {HTMLElement} container The component will append
  3324. * itself to this
  3325. * @param {Function} progressCheck A method which will be
  3326. * called frequently to get the current progress on a range
  3327. * of 0-1
  3328. */
  3329. function Playback( container, progressCheck ) {
  3330. // Cosmetics
  3331. this.diameter = 50;
  3332. this.thickness = 3;
  3333. // Flags if we are currently playing
  3334. this.playing = false;
  3335. // Current progress on a 0-1 range
  3336. this.progress = 0;
  3337. // Used to loop the animation smoothly
  3338. this.progressOffset = 1;
  3339. this.container = container;
  3340. this.progressCheck = progressCheck;
  3341. this.canvas = document.createElement( 'canvas' );
  3342. this.canvas.className = 'playback';
  3343. this.canvas.width = this.diameter;
  3344. this.canvas.height = this.diameter;
  3345. this.context = this.canvas.getContext( '2d' );
  3346. this.container.appendChild( this.canvas );
  3347. this.render();
  3348. }
  3349. Playback.prototype.setPlaying = function( value ) {
  3350. var wasPlaying = this.playing;
  3351. this.playing = value;
  3352. // Start repainting if we weren't already
  3353. if( !wasPlaying && this.playing ) {
  3354. this.animate();
  3355. }
  3356. else {
  3357. this.render();
  3358. }
  3359. };
  3360. Playback.prototype.animate = function() {
  3361. var progressBefore = this.progress;
  3362. this.progress = this.progressCheck();
  3363. // When we loop, offset the progress so that it eases
  3364. // smoothly rather than immediately resetting
  3365. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  3366. this.progressOffset = this.progress;
  3367. }
  3368. this.render();
  3369. if( this.playing ) {
  3370. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  3371. }
  3372. };
  3373. /**
  3374. * Renders the current progress and playback state.
  3375. */
  3376. Playback.prototype.render = function() {
  3377. var progress = this.playing ? this.progress : 0,
  3378. radius = ( this.diameter / 2 ) - this.thickness,
  3379. x = this.diameter / 2,
  3380. y = this.diameter / 2,
  3381. iconSize = 14;
  3382. // Ease towards 1
  3383. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  3384. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  3385. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  3386. this.context.save();
  3387. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  3388. // Solid background color
  3389. this.context.beginPath();
  3390. this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false );
  3391. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  3392. this.context.fill();
  3393. // Draw progress track
  3394. this.context.beginPath();
  3395. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  3396. this.context.lineWidth = this.thickness;
  3397. this.context.strokeStyle = '#666';
  3398. this.context.stroke();
  3399. if( this.playing ) {
  3400. // Draw progress on top of track
  3401. this.context.beginPath();
  3402. this.context.arc( x, y, radius, startAngle, endAngle, false );
  3403. this.context.lineWidth = this.thickness;
  3404. this.context.strokeStyle = '#fff';
  3405. this.context.stroke();
  3406. }
  3407. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  3408. // Draw play/pause icons
  3409. if( this.playing ) {
  3410. this.context.fillStyle = '#fff';
  3411. this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize );
  3412. this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize );
  3413. }
  3414. else {
  3415. this.context.beginPath();
  3416. this.context.translate( 2, 0 );
  3417. this.context.moveTo( 0, 0 );
  3418. this.context.lineTo( iconSize - 2, iconSize / 2 );
  3419. this.context.lineTo( 0, iconSize );
  3420. this.context.fillStyle = '#fff';
  3421. this.context.fill();
  3422. }
  3423. this.context.restore();
  3424. };
  3425. Playback.prototype.on = function( type, listener ) {
  3426. this.canvas.addEventListener( type, listener, false );
  3427. };
  3428. Playback.prototype.off = function( type, listener ) {
  3429. this.canvas.removeEventListener( type, listener, false );
  3430. };
  3431. Playback.prototype.destroy = function() {
  3432. this.playing = false;
  3433. if( this.canvas.parentNode ) {
  3434. this.container.removeChild( this.canvas );
  3435. }
  3436. };
  3437. // --------------------------------------------------------------------//
  3438. // ------------------------------- API --------------------------------//
  3439. // --------------------------------------------------------------------//
  3440. Reveal = {
  3441. initialize: initialize,
  3442. configure: configure,
  3443. sync: sync,
  3444. // Navigation methods
  3445. slide: slide,
  3446. left: navigateLeft,
  3447. right: navigateRight,
  3448. up: navigateUp,
  3449. down: navigateDown,
  3450. prev: navigatePrev,
  3451. next: navigateNext,
  3452. // Fragment methods
  3453. navigateFragment: navigateFragment,
  3454. prevFragment: previousFragment,
  3455. nextFragment: nextFragment,
  3456. // Deprecated aliases
  3457. navigateTo: slide,
  3458. navigateLeft: navigateLeft,
  3459. navigateRight: navigateRight,
  3460. navigateUp: navigateUp,
  3461. navigateDown: navigateDown,
  3462. navigatePrev: navigatePrev,
  3463. navigateNext: navigateNext,
  3464. // Forces an update in slide layout
  3465. layout: layout,
  3466. // Returns an object with the available routes as booleans (left/right/top/bottom)
  3467. availableRoutes: availableRoutes,
  3468. // Returns an object with the available fragments as booleans (prev/next)
  3469. availableFragments: availableFragments,
  3470. // Toggles the overview mode on/off
  3471. toggleOverview: toggleOverview,
  3472. // Toggles the "black screen" mode on/off
  3473. togglePause: togglePause,
  3474. // Toggles the auto slide mode on/off
  3475. toggleAutoSlide: toggleAutoSlide,
  3476. // State checks
  3477. isOverview: isOverview,
  3478. isPaused: isPaused,
  3479. isAutoSliding: isAutoSliding,
  3480. // Adds or removes all internal event listeners (such as keyboard)
  3481. addEventListeners: addEventListeners,
  3482. removeEventListeners: removeEventListeners,
  3483. // Facility for persisting and restoring the presentation state
  3484. getState: getState,
  3485. setState: setState,
  3486. // Presentation progress on range of 0-1
  3487. getProgress: getProgress,
  3488. // Returns the indices of the current, or specified, slide
  3489. getIndices: getIndices,
  3490. getTotalSlides: getTotalSlides,
  3491. // Returns the slide element at the specified index
  3492. getSlide: getSlide,
  3493. // Returns the slide background element at the specified index
  3494. getSlideBackground: getSlideBackground,
  3495. // Returns the speaker notes string for a slide, or null
  3496. getSlideNotes: getSlideNotes,
  3497. // Returns the previous slide element, may be null
  3498. getPreviousSlide: function() {
  3499. return previousSlide;
  3500. },
  3501. // Returns the current slide element
  3502. getCurrentSlide: function() {
  3503. return currentSlide;
  3504. },
  3505. // Returns the current scale of the presentation content
  3506. getScale: function() {
  3507. return scale;
  3508. },
  3509. // Returns the current configuration object
  3510. getConfig: function() {
  3511. return config;
  3512. },
  3513. // Helper method, retrieves query string as a key/value hash
  3514. getQueryHash: function() {
  3515. var query = {};
  3516. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  3517. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  3518. } );
  3519. // Basic deserialization
  3520. for( var i in query ) {
  3521. var value = query[ i ];
  3522. query[ i ] = deserialize( unescape( value ) );
  3523. }
  3524. return query;
  3525. },
  3526. // Returns true if we're currently on the first slide
  3527. isFirstSlide: function() {
  3528. return ( indexh === 0 && indexv === 0 );
  3529. },
  3530. // Returns true if we're currently on the last slide
  3531. isLastSlide: function() {
  3532. if( currentSlide ) {
  3533. // Does this slide has next a sibling?
  3534. if( currentSlide.nextElementSibling ) return false;
  3535. // If it's vertical, does its parent have a next sibling?
  3536. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  3537. return true;
  3538. }
  3539. return false;
  3540. },
  3541. // Checks if reveal.js has been loaded and is ready for use
  3542. isReady: function() {
  3543. return loaded;
  3544. },
  3545. // Forward event binding to the reveal DOM element
  3546. addEventListener: function( type, listener, useCapture ) {
  3547. if( 'addEventListener' in window ) {
  3548. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  3549. }
  3550. },
  3551. removeEventListener: function( type, listener, useCapture ) {
  3552. if( 'addEventListener' in window ) {
  3553. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  3554. }
  3555. },
  3556. // Programatically triggers a keyboard event
  3557. triggerKey: function( keyCode ) {
  3558. onDocumentKeyDown( { keyCode: keyCode } );
  3559. }
  3560. };
  3561. return Reveal;
  3562. }));