reveal.js 103 KB

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  1. /*!
  2. * reveal.js
  3. * http://lab.hakim.se/reveal-js
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2014 Hakim El Hattab, http://hakim.se
  7. */
  8. var Reveal = (function(){
  9. 'use strict';
  10. var SLIDES_SELECTOR = '.reveal .slides section',
  11. HORIZONTAL_SLIDES_SELECTOR = '.reveal .slides>section',
  12. VERTICAL_SLIDES_SELECTOR = '.reveal .slides>section.present>section',
  13. HOME_SLIDE_SELECTOR = '.reveal .slides>section:first-of-type',
  14. // Configurations defaults, can be overridden at initialization time
  15. config = {
  16. // The "normal" size of the presentation, aspect ratio will be preserved
  17. // when the presentation is scaled to fit different resolutions
  18. width: 960,
  19. height: 700,
  20. // Factor of the display size that should remain empty around the content
  21. margin: 0.1,
  22. // Bounds for smallest/largest possible scale to apply to content
  23. minScale: 0.2,
  24. maxScale: 1.0,
  25. // Display controls in the bottom right corner
  26. controls: true,
  27. // Display a presentation progress bar
  28. progress: true,
  29. // Display the page number of the current slide
  30. slideNumber: false,
  31. // Push each slide change to the browser history
  32. history: false,
  33. // Enable keyboard shortcuts for navigation
  34. keyboard: true,
  35. // Optional function that blocks keyboard events when retuning false
  36. keyboardCondition: null,
  37. // Enable the slide overview mode
  38. overview: true,
  39. // Vertical centering of slides
  40. center: true,
  41. // Enables touch navigation on devices with touch input
  42. touch: true,
  43. // Loop the presentation
  44. loop: false,
  45. // Change the presentation direction to be RTL
  46. rtl: false,
  47. // Turns fragments on and off globally
  48. fragments: true,
  49. // Flags if the presentation is running in an embedded mode,
  50. // i.e. contained within a limited portion of the screen
  51. embedded: false,
  52. // Number of milliseconds between automatically proceeding to the
  53. // next slide, disabled when set to 0, this value can be overwritten
  54. // by using a data-autoslide attribute on your slides
  55. autoSlide: 0,
  56. // Stop auto-sliding after user input
  57. autoSlideStoppable: true,
  58. // Enable slide navigation via mouse wheel
  59. mouseWheel: false,
  60. // Apply a 3D roll to links on hover
  61. rollingLinks: false,
  62. // Hides the address bar on mobile devices
  63. hideAddressBar: true,
  64. // Opens links in an iframe preview overlay
  65. previewLinks: false,
  66. // Exposes the reveal.js API through window.postMessage
  67. postMessage: true,
  68. // Dispatches all reveal.js events to the parent window through postMessage
  69. postMessageEvents: false,
  70. // Focuses body when page changes visiblity to ensure keyboard shortcuts work
  71. focusBodyOnPageVisiblityChange: true,
  72. // Theme (see /css/theme)
  73. theme: null,
  74. // Transition style
  75. transition: 'default', // none/fade/slide/convex/concave/zoom
  76. // Transition speed
  77. transitionSpeed: 'default', // default/fast/slow
  78. // Transition style for full page slide backgrounds
  79. backgroundTransition: 'default', // none/fade/slide/convex/concave/zoom
  80. // Parallax background image
  81. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  82. // Parallax background size
  83. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  84. // Number of slides away from the current that are visible
  85. viewDistance: 3,
  86. // Script dependencies to load
  87. dependencies: []
  88. },
  89. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  90. loaded = false,
  91. // The horizontal and vertical index of the currently active slide
  92. indexh,
  93. indexv,
  94. // The previous and current slide HTML elements
  95. previousSlide,
  96. currentSlide,
  97. previousBackground,
  98. // Slides may hold a data-state attribute which we pick up and apply
  99. // as a class to the body. This list contains the combined state of
  100. // all current slides.
  101. state = [],
  102. // The current scale of the presentation (see width/height config)
  103. scale = 1,
  104. // Cached references to DOM elements
  105. dom = {},
  106. // Features supported by the browser, see #checkCapabilities()
  107. features = {},
  108. // Client is a mobile device, see #checkCapabilities()
  109. isMobileDevice,
  110. // Throttles mouse wheel navigation
  111. lastMouseWheelStep = 0,
  112. // Delays updates to the URL due to a Chrome thumbnailer bug
  113. writeURLTimeout = 0,
  114. // Flags if the interaction event listeners are bound
  115. eventsAreBound = false,
  116. // The current auto-slide duration
  117. autoSlide = 0,
  118. // Auto slide properties
  119. autoSlidePlayer,
  120. autoSlideTimeout = 0,
  121. autoSlideStartTime = -1,
  122. autoSlidePaused = false,
  123. // Holds information about the currently ongoing touch input
  124. touch = {
  125. startX: 0,
  126. startY: 0,
  127. startSpan: 0,
  128. startCount: 0,
  129. captured: false,
  130. threshold: 40
  131. };
  132. /**
  133. * Starts up the presentation if the client is capable.
  134. */
  135. function initialize( options ) {
  136. checkCapabilities();
  137. if( !features.transforms2d && !features.transforms3d ) {
  138. document.body.setAttribute( 'class', 'no-transforms' );
  139. // If the browser doesn't support core features we won't be
  140. // using JavaScript to control the presentation
  141. return;
  142. }
  143. // Force a layout when the whole page, incl fonts, has loaded
  144. window.addEventListener( 'load', layout, false );
  145. var query = Reveal.getQueryHash();
  146. // Do not accept new dependencies via query config to avoid
  147. // the potential of malicious script injection
  148. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  149. // Copy options over to our config object
  150. extend( config, options );
  151. extend( config, query );
  152. // Hide the address bar in mobile browsers
  153. hideAddressBar();
  154. // Loads the dependencies and continues to #start() once done
  155. load();
  156. }
  157. /**
  158. * Inspect the client to see what it's capable of, this
  159. * should only happens once per runtime.
  160. */
  161. function checkCapabilities() {
  162. features.transforms3d = 'WebkitPerspective' in document.body.style ||
  163. 'MozPerspective' in document.body.style ||
  164. 'msPerspective' in document.body.style ||
  165. 'OPerspective' in document.body.style ||
  166. 'perspective' in document.body.style;
  167. features.transforms2d = 'WebkitTransform' in document.body.style ||
  168. 'MozTransform' in document.body.style ||
  169. 'msTransform' in document.body.style ||
  170. 'OTransform' in document.body.style ||
  171. 'transform' in document.body.style;
  172. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  173. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  174. features.canvas = !!document.createElement( 'canvas' ).getContext;
  175. isMobileDevice = navigator.userAgent.match( /(iphone|ipod|android)/gi );
  176. }
  177. /**
  178. * Loads the dependencies of reveal.js. Dependencies are
  179. * defined via the configuration option 'dependencies'
  180. * and will be loaded prior to starting/binding reveal.js.
  181. * Some dependencies may have an 'async' flag, if so they
  182. * will load after reveal.js has been started up.
  183. */
  184. function load() {
  185. var scripts = [],
  186. scriptsAsync = [],
  187. scriptsToPreload = 0;
  188. // Called once synchronous scripts finish loading
  189. function proceed() {
  190. if( scriptsAsync.length ) {
  191. // Load asynchronous scripts
  192. head.js.apply( null, scriptsAsync );
  193. }
  194. start();
  195. }
  196. function loadScript( s ) {
  197. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
  198. // Extension may contain callback functions
  199. if( typeof s.callback === 'function' ) {
  200. s.callback.apply( this );
  201. }
  202. if( --scriptsToPreload === 0 ) {
  203. proceed();
  204. }
  205. });
  206. }
  207. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  208. var s = config.dependencies[i];
  209. // Load if there's no condition or the condition is truthy
  210. if( !s.condition || s.condition() ) {
  211. if( s.async ) {
  212. scriptsAsync.push( s.src );
  213. }
  214. else {
  215. scripts.push( s.src );
  216. }
  217. loadScript( s );
  218. }
  219. }
  220. if( scripts.length ) {
  221. scriptsToPreload = scripts.length;
  222. // Load synchronous scripts
  223. head.js.apply( null, scripts );
  224. }
  225. else {
  226. proceed();
  227. }
  228. }
  229. /**
  230. * Starts up reveal.js by binding input events and navigating
  231. * to the current URL deeplink if there is one.
  232. */
  233. function start() {
  234. // Make sure we've got all the DOM elements we need
  235. setupDOM();
  236. // Listen to messages posted to this window
  237. setupPostMessage();
  238. // Resets all vertical slides so that only the first is visible
  239. resetVerticalSlides();
  240. // Updates the presentation to match the current configuration values
  241. configure();
  242. // Read the initial hash
  243. readURL();
  244. // Update all backgrounds
  245. updateBackground( true );
  246. // Special setup and config is required when printing to PDF
  247. if( isPrintingPDF() ) {
  248. removeEventListeners();
  249. setupPDF();
  250. }
  251. // Notify listeners that the presentation is ready but use a 1ms
  252. // timeout to ensure it's not fired synchronously after #initialize()
  253. setTimeout( function() {
  254. // Enable transitions now that we're loaded
  255. dom.slides.classList.remove( 'no-transition' );
  256. loaded = true;
  257. dispatchEvent( 'ready', {
  258. 'indexh': indexh,
  259. 'indexv': indexv,
  260. 'currentSlide': currentSlide
  261. } );
  262. }, 1 );
  263. }
  264. /**
  265. * Finds and stores references to DOM elements which are
  266. * required by the presentation. If a required element is
  267. * not found, it is created.
  268. */
  269. function setupDOM() {
  270. // Cache references to key DOM elements
  271. dom.theme = document.querySelector( '#theme' );
  272. dom.wrapper = document.querySelector( '.reveal' );
  273. dom.slides = document.querySelector( '.reveal .slides' );
  274. // Prevent transitions while we're loading
  275. dom.slides.classList.add( 'no-transition' );
  276. // Background element
  277. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  278. // Progress bar
  279. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  280. dom.progressbar = dom.progress.querySelector( 'span' );
  281. // Arrow controls
  282. createSingletonNode( dom.wrapper, 'aside', 'controls',
  283. '<div class="navigate-left"></div>' +
  284. '<div class="navigate-right"></div>' +
  285. '<div class="navigate-up"></div>' +
  286. '<div class="navigate-down"></div>' );
  287. // Slide number
  288. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  289. // State background element [DEPRECATED]
  290. createSingletonNode( dom.wrapper, 'div', 'state-background', null );
  291. // Overlay graphic which is displayed during the paused mode
  292. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  293. // Cache references to elements
  294. dom.controls = document.querySelector( '.reveal .controls' );
  295. // There can be multiple instances of controls throughout the page
  296. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  297. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  298. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  299. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  300. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  301. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  302. }
  303. /**
  304. * Configures the presentation for printing to a static
  305. * PDF.
  306. */
  307. function setupPDF() {
  308. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  309. // Dimensions of the PDF pages
  310. var pageWidth = Math.round( slideSize.width * ( 1 + config.margin ) ),
  311. pageHeight = Math.round( slideSize.height * ( 1 + config.margin ) );
  312. // Dimensions of slides within the pages
  313. var slideWidth = slideSize.width,
  314. slideHeight = slideSize.height;
  315. // Let the browser know what page size we want to print
  316. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' );
  317. document.body.classList.add( 'print-pdf' );
  318. document.body.style.width = pageWidth + 'px';
  319. document.body.style.height = pageHeight + 'px';
  320. // Slide and slide background layout
  321. toArray( document.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  322. // Vertical stacks are not centred since their section
  323. // children will be
  324. if( slide.classList.contains( 'stack' ) === false ) {
  325. // Center the slide inside of the page, giving the slide some margin
  326. var left = ( pageWidth - slideWidth ) / 2,
  327. top = ( pageHeight - slideHeight ) / 2;
  328. var contentHeight = getAbsoluteHeight( slide );
  329. var numberOfPages = Math.ceil( contentHeight / pageHeight );
  330. // Center slides vertically
  331. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  332. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  333. }
  334. // Position the slide inside of the page
  335. slide.style.left = left + 'px';
  336. slide.style.top = top + 'px';
  337. slide.style.width = slideWidth + 'px';
  338. // TODO Backgrounds need to be multiplied when the slide
  339. // stretches over multiple pages
  340. var background = slide.querySelector( '.slide-background' );
  341. if( background ) {
  342. background.style.width = pageWidth + 'px';
  343. background.style.height = ( pageHeight * numberOfPages ) + 'px';
  344. background.style.top = -top + 'px';
  345. background.style.left = -left + 'px';
  346. }
  347. }
  348. } );
  349. // Show all fragments
  350. toArray( document.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
  351. fragment.classList.add( 'visible' );
  352. } );
  353. }
  354. /**
  355. * Creates an HTML element and returns a reference to it.
  356. * If the element already exists the existing instance will
  357. * be returned.
  358. */
  359. function createSingletonNode( container, tagname, classname, innerHTML ) {
  360. var node = container.querySelector( '.' + classname );
  361. if( !node ) {
  362. node = document.createElement( tagname );
  363. node.classList.add( classname );
  364. if( innerHTML !== null ) {
  365. node.innerHTML = innerHTML;
  366. }
  367. container.appendChild( node );
  368. }
  369. return node;
  370. }
  371. /**
  372. * Creates the slide background elements and appends them
  373. * to the background container. One element is created per
  374. * slide no matter if the given slide has visible background.
  375. */
  376. function createBackgrounds() {
  377. var printMode = isPrintingPDF();
  378. // Clear prior backgrounds
  379. dom.background.innerHTML = '';
  380. dom.background.classList.add( 'no-transition' );
  381. // Iterate over all horizontal slides
  382. toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  383. var backgroundStack;
  384. if( printMode ) {
  385. backgroundStack = createBackground( slideh, slideh );
  386. }
  387. else {
  388. backgroundStack = createBackground( slideh, dom.background );
  389. }
  390. // Iterate over all vertical slides
  391. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  392. if( printMode ) {
  393. createBackground( slidev, slidev );
  394. }
  395. else {
  396. createBackground( slidev, backgroundStack );
  397. }
  398. backgroundStack.classList.add( 'stack' );
  399. } );
  400. } );
  401. // Add parallax background if specified
  402. if( config.parallaxBackgroundImage ) {
  403. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  404. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  405. // Make sure the below properties are set on the element - these properties are
  406. // needed for proper transitions to be set on the element via CSS. To remove
  407. // annoying background slide-in effect when the presentation starts, apply
  408. // these properties after short time delay
  409. setTimeout( function() {
  410. dom.wrapper.classList.add( 'has-parallax-background' );
  411. }, 1 );
  412. }
  413. else {
  414. dom.background.style.backgroundImage = '';
  415. dom.wrapper.classList.remove( 'has-parallax-background' );
  416. }
  417. }
  418. /**
  419. * Creates a background for the given slide.
  420. *
  421. * @param {HTMLElement} slide
  422. * @param {HTMLElement} container The element that the background
  423. * should be appended to
  424. */
  425. function createBackground( slide, container ) {
  426. var data = {
  427. background: slide.getAttribute( 'data-background' ),
  428. backgroundSize: slide.getAttribute( 'data-background-size' ),
  429. backgroundImage: slide.getAttribute( 'data-background-image' ),
  430. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  431. backgroundColor: slide.getAttribute( 'data-background-color' ),
  432. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  433. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  434. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  435. };
  436. var element = document.createElement( 'div' );
  437. // Carry over custom classes from the slide to the background
  438. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  439. if( data.background ) {
  440. // Auto-wrap image urls in url(...)
  441. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
  442. element.style.backgroundImage = 'url('+ data.background +')';
  443. }
  444. else {
  445. element.style.background = data.background;
  446. }
  447. }
  448. // Create a hash for this combination of background settings.
  449. // This is used to determine when two slide backgrounds are
  450. // the same.
  451. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo ) {
  452. element.setAttribute( 'data-background-hash', data.background +
  453. data.backgroundSize +
  454. data.backgroundImage +
  455. data.backgroundVideo +
  456. data.backgroundColor +
  457. data.backgroundRepeat +
  458. data.backgroundPosition +
  459. data.backgroundTransition );
  460. }
  461. // Additional and optional background properties
  462. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  463. if( data.backgroundImage ) element.style.backgroundImage = 'url("' + data.backgroundImage + '")';
  464. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  465. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  466. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  467. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  468. // Create video background element
  469. if( data.backgroundVideo ) {
  470. var video = document.createElement( 'video' );
  471. // Support comma separated lists of video sources
  472. data.backgroundVideo.split( ',' ).forEach( function( source ) {
  473. video.innerHTML += '<source src="'+ source +'">';
  474. } );
  475. element.appendChild( video );
  476. }
  477. container.appendChild( element );
  478. return element;
  479. }
  480. /**
  481. * Registers a listener to postMessage events, this makes it
  482. * possible to call all reveal.js API methods from another
  483. * window. For example:
  484. *
  485. * revealWindow.postMessage( JSON.stringify({
  486. * method: 'slide',
  487. * args: [ 2 ]
  488. * }), '*' );
  489. */
  490. function setupPostMessage() {
  491. if( config.postMessage ) {
  492. window.addEventListener( 'message', function ( event ) {
  493. var data = event.data;
  494. // Make sure we're dealing with JSON
  495. if( data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  496. data = JSON.parse( data );
  497. // Check if the requested method can be found
  498. if( data.method && typeof Reveal[data.method] === 'function' ) {
  499. Reveal[data.method].apply( Reveal, data.args );
  500. }
  501. }
  502. }, false );
  503. }
  504. }
  505. /**
  506. * Applies the configuration settings from the config
  507. * object. May be called multiple times.
  508. */
  509. function configure( options ) {
  510. var numberOfSlides = document.querySelectorAll( SLIDES_SELECTOR ).length;
  511. dom.wrapper.classList.remove( config.transition );
  512. // New config options may be passed when this method
  513. // is invoked through the API after initialization
  514. if( typeof options === 'object' ) extend( config, options );
  515. // Force linear transition based on browser capabilities
  516. if( features.transforms3d === false ) config.transition = 'linear';
  517. dom.wrapper.classList.add( config.transition );
  518. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  519. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  520. dom.controls.style.display = config.controls ? 'block' : 'none';
  521. dom.progress.style.display = config.progress ? 'block' : 'none';
  522. if( config.rtl ) {
  523. dom.wrapper.classList.add( 'rtl' );
  524. }
  525. else {
  526. dom.wrapper.classList.remove( 'rtl' );
  527. }
  528. if( config.center ) {
  529. dom.wrapper.classList.add( 'center' );
  530. }
  531. else {
  532. dom.wrapper.classList.remove( 'center' );
  533. }
  534. if( config.mouseWheel ) {
  535. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  536. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  537. }
  538. else {
  539. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  540. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  541. }
  542. // Rolling 3D links
  543. if( config.rollingLinks ) {
  544. enableRollingLinks();
  545. }
  546. else {
  547. disableRollingLinks();
  548. }
  549. // Iframe link previews
  550. if( config.previewLinks ) {
  551. enablePreviewLinks();
  552. }
  553. else {
  554. disablePreviewLinks();
  555. enablePreviewLinks( '[data-preview-link]' );
  556. }
  557. // Remove existing auto-slide controls
  558. if( autoSlidePlayer ) {
  559. autoSlidePlayer.destroy();
  560. autoSlidePlayer = null;
  561. }
  562. // Generate auto-slide controls if needed
  563. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  564. autoSlidePlayer = new Playback( dom.wrapper, function() {
  565. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  566. } );
  567. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  568. autoSlidePaused = false;
  569. }
  570. // When fragments are turned off they should be visible
  571. if( config.fragments === false ) {
  572. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  573. element.classList.add( 'visible' );
  574. element.classList.remove( 'current-fragment' );
  575. } );
  576. }
  577. // Load the theme in the config, if it's not already loaded
  578. if( config.theme && dom.theme ) {
  579. var themeURL = dom.theme.getAttribute( 'href' );
  580. var themeFinder = /[^\/]*?(?=\.css)/;
  581. var themeName = themeURL.match(themeFinder)[0];
  582. if( config.theme !== themeName ) {
  583. themeURL = themeURL.replace(themeFinder, config.theme);
  584. dom.theme.setAttribute( 'href', themeURL );
  585. }
  586. }
  587. sync();
  588. }
  589. /**
  590. * Binds all event listeners.
  591. */
  592. function addEventListeners() {
  593. eventsAreBound = true;
  594. window.addEventListener( 'hashchange', onWindowHashChange, false );
  595. window.addEventListener( 'resize', onWindowResize, false );
  596. if( config.touch ) {
  597. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  598. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  599. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  600. // Support pointer-style touch interaction as well
  601. if( window.navigator.pointerEnabled ) {
  602. // IE 11 uses un-prefixed version of pointer events
  603. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  604. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  605. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  606. }
  607. else if( window.navigator.msPointerEnabled ) {
  608. // IE 10 uses prefixed version of pointer events
  609. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  610. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  611. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  612. }
  613. }
  614. if( config.keyboard ) {
  615. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  616. }
  617. if( config.progress && dom.progress ) {
  618. dom.progress.addEventListener( 'click', onProgressClicked, false );
  619. }
  620. if( config.focusBodyOnPageVisiblityChange ) {
  621. var visibilityChange;
  622. if( 'hidden' in document ) {
  623. visibilityChange = 'visibilitychange';
  624. }
  625. else if( 'msHidden' in document ) {
  626. visibilityChange = 'msvisibilitychange';
  627. }
  628. else if( 'webkitHidden' in document ) {
  629. visibilityChange = 'webkitvisibilitychange';
  630. }
  631. if( visibilityChange ) {
  632. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  633. }
  634. }
  635. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  636. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  637. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  638. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  639. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  640. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  641. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  642. } );
  643. }
  644. /**
  645. * Unbinds all event listeners.
  646. */
  647. function removeEventListeners() {
  648. eventsAreBound = false;
  649. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  650. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  651. window.removeEventListener( 'resize', onWindowResize, false );
  652. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  653. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  654. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  655. // IE11
  656. if( window.navigator.pointerEnabled ) {
  657. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  658. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  659. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  660. }
  661. // IE10
  662. else if( window.navigator.msPointerEnabled ) {
  663. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  664. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  665. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  666. }
  667. if ( config.progress && dom.progress ) {
  668. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  669. }
  670. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  671. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  672. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  673. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  674. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  675. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  676. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  677. } );
  678. }
  679. /**
  680. * Extend object a with the properties of object b.
  681. * If there's a conflict, object b takes precedence.
  682. */
  683. function extend( a, b ) {
  684. for( var i in b ) {
  685. a[ i ] = b[ i ];
  686. }
  687. }
  688. /**
  689. * Converts the target object to an array.
  690. */
  691. function toArray( o ) {
  692. return Array.prototype.slice.call( o );
  693. }
  694. /**
  695. * Utility for deserializing a value.
  696. */
  697. function deserialize( value ) {
  698. if( typeof value === 'string' ) {
  699. if( value === 'null' ) return null;
  700. else if( value === 'true' ) return true;
  701. else if( value === 'false' ) return false;
  702. else if( value.match( /^\d+$/ ) ) return parseFloat( value );
  703. }
  704. return value;
  705. }
  706. /**
  707. * Measures the distance in pixels between point a
  708. * and point b.
  709. *
  710. * @param {Object} a point with x/y properties
  711. * @param {Object} b point with x/y properties
  712. */
  713. function distanceBetween( a, b ) {
  714. var dx = a.x - b.x,
  715. dy = a.y - b.y;
  716. return Math.sqrt( dx*dx + dy*dy );
  717. }
  718. /**
  719. * Applies a CSS transform to the target element.
  720. */
  721. function transformElement( element, transform ) {
  722. element.style.WebkitTransform = transform;
  723. element.style.MozTransform = transform;
  724. element.style.msTransform = transform;
  725. element.style.OTransform = transform;
  726. element.style.transform = transform;
  727. }
  728. /**
  729. * Injects the given CSS styles into the DOM.
  730. */
  731. function injectStyleSheet( value ) {
  732. var tag = document.createElement( 'style' );
  733. tag.type = 'text/css';
  734. if( tag.styleSheet ) {
  735. tag.styleSheet.cssText = value;
  736. }
  737. else {
  738. tag.appendChild( document.createTextNode( value ) );
  739. }
  740. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  741. }
  742. /**
  743. * Retrieves the height of the given element by looking
  744. * at the position and height of its immediate children.
  745. */
  746. function getAbsoluteHeight( element ) {
  747. var height = 0;
  748. if( element ) {
  749. var absoluteChildren = 0;
  750. toArray( element.childNodes ).forEach( function( child ) {
  751. if( typeof child.offsetTop === 'number' && child.style ) {
  752. // Count # of abs children
  753. if( window.getComputedStyle( child ).position === 'absolute' ) {
  754. absoluteChildren += 1;
  755. }
  756. height = Math.max( height, child.offsetTop + child.offsetHeight );
  757. }
  758. } );
  759. // If there are no absolute children, use offsetHeight
  760. if( absoluteChildren === 0 ) {
  761. height = element.offsetHeight;
  762. }
  763. }
  764. return height;
  765. }
  766. /**
  767. * Returns the remaining height within the parent of the
  768. * target element.
  769. *
  770. * remaining height = [ configured parent height ] - [ current parent height ]
  771. */
  772. function getRemainingHeight( element, height ) {
  773. height = height || 0;
  774. if( element ) {
  775. var newHeight, oldHeight = element.style.height;
  776. // Change the .stretch element height to 0 in order find the height of all
  777. // the other elements
  778. element.style.height = '0px';
  779. newHeight = height - element.parentNode.offsetHeight;
  780. // Restore the old height, just in case
  781. element.style.height = oldHeight + 'px';
  782. return newHeight;
  783. }
  784. return height;
  785. }
  786. /**
  787. * Checks if this instance is being used to print a PDF.
  788. */
  789. function isPrintingPDF() {
  790. return ( /print-pdf/gi ).test( window.location.search );
  791. }
  792. /**
  793. * Hides the address bar if we're on a mobile device.
  794. */
  795. function hideAddressBar() {
  796. if( config.hideAddressBar && isMobileDevice ) {
  797. // Events that should trigger the address bar to hide
  798. window.addEventListener( 'load', removeAddressBar, false );
  799. window.addEventListener( 'orientationchange', removeAddressBar, false );
  800. }
  801. }
  802. /**
  803. * Causes the address bar to hide on mobile devices,
  804. * more vertical space ftw.
  805. */
  806. function removeAddressBar() {
  807. setTimeout( function() {
  808. window.scrollTo( 0, 1 );
  809. }, 10 );
  810. }
  811. /**
  812. * Dispatches an event of the specified type from the
  813. * reveal DOM element.
  814. */
  815. function dispatchEvent( type, args ) {
  816. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  817. event.initEvent( type, true, true );
  818. extend( event, args );
  819. dom.wrapper.dispatchEvent( event );
  820. // If we're in an iframe, post each reveal.js event to the
  821. // parent window. Used by the notes plugin
  822. if( config.postMessageEvents && window.parent !== window.self ) {
  823. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  824. }
  825. }
  826. /**
  827. * Wrap all links in 3D goodness.
  828. */
  829. function enableRollingLinks() {
  830. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  831. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a' );
  832. for( var i = 0, len = anchors.length; i < len; i++ ) {
  833. var anchor = anchors[i];
  834. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  835. var span = document.createElement('span');
  836. span.setAttribute('data-title', anchor.text);
  837. span.innerHTML = anchor.innerHTML;
  838. anchor.classList.add( 'roll' );
  839. anchor.innerHTML = '';
  840. anchor.appendChild(span);
  841. }
  842. }
  843. }
  844. }
  845. /**
  846. * Unwrap all 3D links.
  847. */
  848. function disableRollingLinks() {
  849. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  850. for( var i = 0, len = anchors.length; i < len; i++ ) {
  851. var anchor = anchors[i];
  852. var span = anchor.querySelector( 'span' );
  853. if( span ) {
  854. anchor.classList.remove( 'roll' );
  855. anchor.innerHTML = span.innerHTML;
  856. }
  857. }
  858. }
  859. /**
  860. * Bind preview frame links.
  861. */
  862. function enablePreviewLinks( selector ) {
  863. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  864. anchors.forEach( function( element ) {
  865. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  866. element.addEventListener( 'click', onPreviewLinkClicked, false );
  867. }
  868. } );
  869. }
  870. /**
  871. * Unbind preview frame links.
  872. */
  873. function disablePreviewLinks() {
  874. var anchors = toArray( document.querySelectorAll( 'a' ) );
  875. anchors.forEach( function( element ) {
  876. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  877. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  878. }
  879. } );
  880. }
  881. /**
  882. * Opens a preview window for the target URL.
  883. */
  884. function openPreview( url ) {
  885. closePreview();
  886. dom.preview = document.createElement( 'div' );
  887. dom.preview.classList.add( 'preview-link-overlay' );
  888. dom.wrapper.appendChild( dom.preview );
  889. dom.preview.innerHTML = [
  890. '<header>',
  891. '<a class="close" href="#"><span class="icon"></span></a>',
  892. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  893. '</header>',
  894. '<div class="spinner"></div>',
  895. '<div class="viewport">',
  896. '<iframe src="'+ url +'"></iframe>',
  897. '</div>'
  898. ].join('');
  899. dom.preview.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  900. dom.preview.classList.add( 'loaded' );
  901. }, false );
  902. dom.preview.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  903. closePreview();
  904. event.preventDefault();
  905. }, false );
  906. dom.preview.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  907. closePreview();
  908. }, false );
  909. setTimeout( function() {
  910. dom.preview.classList.add( 'visible' );
  911. }, 1 );
  912. }
  913. /**
  914. * Closes the iframe preview window.
  915. */
  916. function closePreview() {
  917. if( dom.preview ) {
  918. dom.preview.setAttribute( 'src', '' );
  919. dom.preview.parentNode.removeChild( dom.preview );
  920. dom.preview = null;
  921. }
  922. }
  923. /**
  924. * Applies JavaScript-controlled layout rules to the
  925. * presentation.
  926. */
  927. function layout() {
  928. if( dom.wrapper && !isPrintingPDF() ) {
  929. var size = getComputedSlideSize();
  930. var slidePadding = 20; // TODO Dig this out of DOM
  931. // Layout the contents of the slides
  932. layoutSlideContents( config.width, config.height, slidePadding );
  933. dom.slides.style.width = size.width + 'px';
  934. dom.slides.style.height = size.height + 'px';
  935. // Determine scale of content to fit within available space
  936. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  937. // Respect max/min scale settings
  938. scale = Math.max( scale, config.minScale );
  939. scale = Math.min( scale, config.maxScale );
  940. // Prefer zooming in WebKit so that content remains crisp
  941. if( /webkit/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) {
  942. dom.slides.style.zoom = scale;
  943. }
  944. // Apply scale transform as a fallback
  945. else {
  946. dom.slides.style.left = '50%';
  947. dom.slides.style.top = '50%';
  948. dom.slides.style.bottom = 'auto';
  949. dom.slides.style.right = 'auto';
  950. transformElement( dom.slides, 'translate(-50%, -50%) scale('+ scale +')' );
  951. }
  952. // Select all slides, vertical and horizontal
  953. var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
  954. for( var i = 0, len = slides.length; i < len; i++ ) {
  955. var slide = slides[ i ];
  956. // Don't bother updating invisible slides
  957. if( slide.style.display === 'none' ) {
  958. continue;
  959. }
  960. if( config.center || slide.classList.contains( 'center' ) ) {
  961. // Vertical stacks are not centred since their section
  962. // children will be
  963. if( slide.classList.contains( 'stack' ) ) {
  964. slide.style.top = 0;
  965. }
  966. else {
  967. slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
  968. }
  969. }
  970. else {
  971. slide.style.top = '';
  972. }
  973. }
  974. updateProgress();
  975. updateParallax();
  976. }
  977. }
  978. /**
  979. * Applies layout logic to the contents of all slides in
  980. * the presentation.
  981. */
  982. function layoutSlideContents( width, height, padding ) {
  983. // Handle sizing of elements with the 'stretch' class
  984. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  985. // Determine how much vertical space we can use
  986. var remainingHeight = getRemainingHeight( element, height );
  987. // Consider the aspect ratio of media elements
  988. if( /(img|video)/gi.test( element.nodeName ) ) {
  989. var nw = element.naturalWidth || element.videoWidth,
  990. nh = element.naturalHeight || element.videoHeight;
  991. var es = Math.min( width / nw, remainingHeight / nh );
  992. element.style.width = ( nw * es ) + 'px';
  993. element.style.height = ( nh * es ) + 'px';
  994. }
  995. else {
  996. element.style.width = width + 'px';
  997. element.style.height = remainingHeight + 'px';
  998. }
  999. } );
  1000. }
  1001. /**
  1002. * Calculates the computed pixel size of our slides. These
  1003. * values are based on the width and height configuration
  1004. * options.
  1005. */
  1006. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1007. var size = {
  1008. // Slide size
  1009. width: config.width,
  1010. height: config.height,
  1011. // Presentation size
  1012. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1013. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1014. };
  1015. // Reduce available space by margin
  1016. size.presentationWidth -= ( size.presentationHeight * config.margin );
  1017. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1018. // Slide width may be a percentage of available width
  1019. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1020. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1021. }
  1022. // Slide height may be a percentage of available height
  1023. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1024. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1025. }
  1026. return size;
  1027. }
  1028. /**
  1029. * Stores the vertical index of a stack so that the same
  1030. * vertical slide can be selected when navigating to and
  1031. * from the stack.
  1032. *
  1033. * @param {HTMLElement} stack The vertical stack element
  1034. * @param {int} v Index to memorize
  1035. */
  1036. function setPreviousVerticalIndex( stack, v ) {
  1037. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1038. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1039. }
  1040. }
  1041. /**
  1042. * Retrieves the vertical index which was stored using
  1043. * #setPreviousVerticalIndex() or 0 if no previous index
  1044. * exists.
  1045. *
  1046. * @param {HTMLElement} stack The vertical stack element
  1047. */
  1048. function getPreviousVerticalIndex( stack ) {
  1049. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1050. // Prefer manually defined start-indexv
  1051. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1052. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1053. }
  1054. return 0;
  1055. }
  1056. /**
  1057. * Displays the overview of slides (quick nav) by
  1058. * scaling down and arranging all slide elements.
  1059. *
  1060. * Experimental feature, might be dropped if perf
  1061. * can't be improved.
  1062. */
  1063. function activateOverview() {
  1064. // Only proceed if enabled in config
  1065. if( config.overview ) {
  1066. // Don't auto-slide while in overview mode
  1067. cancelAutoSlide();
  1068. var wasActive = dom.wrapper.classList.contains( 'overview' );
  1069. // Vary the depth of the overview based on screen size
  1070. var depth = window.innerWidth < 400 ? 1000 : 2500;
  1071. dom.wrapper.classList.add( 'overview' );
  1072. dom.wrapper.classList.remove( 'overview-deactivating' );
  1073. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1074. for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
  1075. var hslide = horizontalSlides[i],
  1076. hoffset = config.rtl ? -105 : 105;
  1077. hslide.setAttribute( 'data-index-h', i );
  1078. // Apply CSS transform
  1079. transformElement( hslide, 'translateZ(-'+ depth +'px) translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)' );
  1080. if( hslide.classList.contains( 'stack' ) ) {
  1081. var verticalSlides = hslide.querySelectorAll( 'section' );
  1082. for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
  1083. var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );
  1084. var vslide = verticalSlides[j];
  1085. vslide.setAttribute( 'data-index-h', i );
  1086. vslide.setAttribute( 'data-index-v', j );
  1087. // Apply CSS transform
  1088. transformElement( vslide, 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)' );
  1089. // Navigate to this slide on click
  1090. vslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1091. }
  1092. }
  1093. else {
  1094. // Navigate to this slide on click
  1095. hslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1096. }
  1097. }
  1098. updateSlidesVisibility();
  1099. layout();
  1100. if( !wasActive ) {
  1101. // Notify observers of the overview showing
  1102. dispatchEvent( 'overviewshown', {
  1103. 'indexh': indexh,
  1104. 'indexv': indexv,
  1105. 'currentSlide': currentSlide
  1106. } );
  1107. }
  1108. }
  1109. }
  1110. /**
  1111. * Exits the slide overview and enters the currently
  1112. * active slide.
  1113. */
  1114. function deactivateOverview() {
  1115. // Only proceed if enabled in config
  1116. if( config.overview ) {
  1117. dom.wrapper.classList.remove( 'overview' );
  1118. // Temporarily add a class so that transitions can do different things
  1119. // depending on whether they are exiting/entering overview, or just
  1120. // moving from slide to slide
  1121. dom.wrapper.classList.add( 'overview-deactivating' );
  1122. setTimeout( function () {
  1123. dom.wrapper.classList.remove( 'overview-deactivating' );
  1124. }, 1 );
  1125. // Select all slides
  1126. toArray( document.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1127. // Resets all transforms to use the external styles
  1128. transformElement( slide, '' );
  1129. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1130. } );
  1131. slide( indexh, indexv );
  1132. cueAutoSlide();
  1133. // Notify observers of the overview hiding
  1134. dispatchEvent( 'overviewhidden', {
  1135. 'indexh': indexh,
  1136. 'indexv': indexv,
  1137. 'currentSlide': currentSlide
  1138. } );
  1139. }
  1140. }
  1141. /**
  1142. * Toggles the slide overview mode on and off.
  1143. *
  1144. * @param {Boolean} override Optional flag which overrides the
  1145. * toggle logic and forcibly sets the desired state. True means
  1146. * overview is open, false means it's closed.
  1147. */
  1148. function toggleOverview( override ) {
  1149. if( typeof override === 'boolean' ) {
  1150. override ? activateOverview() : deactivateOverview();
  1151. }
  1152. else {
  1153. isOverview() ? deactivateOverview() : activateOverview();
  1154. }
  1155. }
  1156. /**
  1157. * Checks if the overview is currently active.
  1158. *
  1159. * @return {Boolean} true if the overview is active,
  1160. * false otherwise
  1161. */
  1162. function isOverview() {
  1163. return dom.wrapper.classList.contains( 'overview' );
  1164. }
  1165. /**
  1166. * Checks if the current or specified slide is vertical
  1167. * (nested within another slide).
  1168. *
  1169. * @param {HTMLElement} slide [optional] The slide to check
  1170. * orientation of
  1171. */
  1172. function isVerticalSlide( slide ) {
  1173. // Prefer slide argument, otherwise use current slide
  1174. slide = slide ? slide : currentSlide;
  1175. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1176. }
  1177. /**
  1178. * Handling the fullscreen functionality via the fullscreen API
  1179. *
  1180. * @see http://fullscreen.spec.whatwg.org/
  1181. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1182. */
  1183. function enterFullscreen() {
  1184. var element = document.body;
  1185. // Check which implementation is available
  1186. var requestMethod = element.requestFullScreen ||
  1187. element.webkitRequestFullscreen ||
  1188. element.webkitRequestFullScreen ||
  1189. element.mozRequestFullScreen ||
  1190. element.msRequestFullscreen;
  1191. if( requestMethod ) {
  1192. requestMethod.apply( element );
  1193. }
  1194. }
  1195. /**
  1196. * Enters the paused mode which fades everything on screen to
  1197. * black.
  1198. */
  1199. function pause() {
  1200. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1201. cancelAutoSlide();
  1202. dom.wrapper.classList.add( 'paused' );
  1203. if( wasPaused === false ) {
  1204. dispatchEvent( 'paused' );
  1205. }
  1206. }
  1207. /**
  1208. * Exits from the paused mode.
  1209. */
  1210. function resume() {
  1211. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1212. dom.wrapper.classList.remove( 'paused' );
  1213. cueAutoSlide();
  1214. if( wasPaused ) {
  1215. dispatchEvent( 'resumed' );
  1216. }
  1217. }
  1218. /**
  1219. * Toggles the paused mode on and off.
  1220. */
  1221. function togglePause( override ) {
  1222. if( typeof override === 'boolean' ) {
  1223. override ? pause() : resume();
  1224. }
  1225. else {
  1226. isPaused() ? resume() : pause();
  1227. }
  1228. }
  1229. /**
  1230. * Checks if we are currently in the paused mode.
  1231. */
  1232. function isPaused() {
  1233. return dom.wrapper.classList.contains( 'paused' );
  1234. }
  1235. /**
  1236. * Toggles the auto slide mode on and off.
  1237. *
  1238. * @param {Boolean} override Optional flag which sets the desired state.
  1239. * True means autoplay starts, false means it stops.
  1240. */
  1241. function toggleAutoSlide( override ) {
  1242. if( typeof override === 'boolean' ) {
  1243. override ? resumeAutoSlide() : pauseAutoSlide();
  1244. }
  1245. else {
  1246. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  1247. }
  1248. }
  1249. /**
  1250. * Checks if the auto slide mode is currently on.
  1251. */
  1252. function isAutoSliding() {
  1253. return !!( autoSlide && !autoSlidePaused );
  1254. }
  1255. /**
  1256. * Steps from the current point in the presentation to the
  1257. * slide which matches the specified horizontal and vertical
  1258. * indices.
  1259. *
  1260. * @param {int} h Horizontal index of the target slide
  1261. * @param {int} v Vertical index of the target slide
  1262. * @param {int} f Optional index of a fragment within the
  1263. * target slide to activate
  1264. * @param {int} o Optional origin for use in multimaster environments
  1265. */
  1266. function slide( h, v, f, o ) {
  1267. // Remember where we were at before
  1268. previousSlide = currentSlide;
  1269. // Query all horizontal slides in the deck
  1270. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1271. // If no vertical index is specified and the upcoming slide is a
  1272. // stack, resume at its previous vertical index
  1273. if( v === undefined ) {
  1274. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1275. }
  1276. // If we were on a vertical stack, remember what vertical index
  1277. // it was on so we can resume at the same position when returning
  1278. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1279. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1280. }
  1281. // Remember the state before this slide
  1282. var stateBefore = state.concat();
  1283. // Reset the state array
  1284. state.length = 0;
  1285. var indexhBefore = indexh || 0,
  1286. indexvBefore = indexv || 0;
  1287. // Activate and transition to the new slide
  1288. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1289. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1290. // Update the visibility of slides now that the indices have changed
  1291. updateSlidesVisibility();
  1292. layout();
  1293. // Apply the new state
  1294. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1295. // Check if this state existed on the previous slide. If it
  1296. // did, we will avoid adding it repeatedly
  1297. for( var j = 0; j < stateBefore.length; j++ ) {
  1298. if( stateBefore[j] === state[i] ) {
  1299. stateBefore.splice( j, 1 );
  1300. continue stateLoop;
  1301. }
  1302. }
  1303. document.documentElement.classList.add( state[i] );
  1304. // Dispatch custom event matching the state's name
  1305. dispatchEvent( state[i] );
  1306. }
  1307. // Clean up the remains of the previous state
  1308. while( stateBefore.length ) {
  1309. document.documentElement.classList.remove( stateBefore.pop() );
  1310. }
  1311. // If the overview is active, re-activate it to update positions
  1312. if( isOverview() ) {
  1313. activateOverview();
  1314. }
  1315. // Find the current horizontal slide and any possible vertical slides
  1316. // within it
  1317. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1318. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1319. // Store references to the previous and current slides
  1320. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1321. // Show fragment, if specified
  1322. if( typeof f !== 'undefined' ) {
  1323. navigateFragment( f );
  1324. }
  1325. // Dispatch an event if the slide changed
  1326. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1327. if( slideChanged ) {
  1328. dispatchEvent( 'slidechanged', {
  1329. 'indexh': indexh,
  1330. 'indexv': indexv,
  1331. 'previousSlide': previousSlide,
  1332. 'currentSlide': currentSlide,
  1333. 'origin': o
  1334. } );
  1335. }
  1336. else {
  1337. // Ensure that the previous slide is never the same as the current
  1338. previousSlide = null;
  1339. }
  1340. // Solves an edge case where the previous slide maintains the
  1341. // 'present' class when navigating between adjacent vertical
  1342. // stacks
  1343. if( previousSlide ) {
  1344. previousSlide.classList.remove( 'present' );
  1345. // Reset all slides upon navigate to home
  1346. // Issue: #285
  1347. if ( document.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1348. // Launch async task
  1349. setTimeout( function () {
  1350. var slides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1351. for( i in slides ) {
  1352. if( slides[i] ) {
  1353. // Reset stack
  1354. setPreviousVerticalIndex( slides[i], 0 );
  1355. }
  1356. }
  1357. }, 0 );
  1358. }
  1359. }
  1360. // Handle embedded content
  1361. if( slideChanged ) {
  1362. stopEmbeddedContent( previousSlide );
  1363. startEmbeddedContent( currentSlide );
  1364. }
  1365. updateControls();
  1366. updateProgress();
  1367. updateBackground();
  1368. updateParallax();
  1369. updateSlideNumber();
  1370. // Update the URL hash
  1371. writeURL();
  1372. cueAutoSlide();
  1373. }
  1374. /**
  1375. * Syncs the presentation with the current DOM. Useful
  1376. * when new slides or control elements are added or when
  1377. * the configuration has changed.
  1378. */
  1379. function sync() {
  1380. // Subscribe to input
  1381. removeEventListeners();
  1382. addEventListeners();
  1383. // Force a layout to make sure the current config is accounted for
  1384. layout();
  1385. // Reflect the current autoSlide value
  1386. autoSlide = config.autoSlide;
  1387. // Start auto-sliding if it's enabled
  1388. cueAutoSlide();
  1389. // Re-create the slide backgrounds
  1390. createBackgrounds();
  1391. sortAllFragments();
  1392. updateControls();
  1393. updateProgress();
  1394. updateBackground( true );
  1395. updateSlideNumber();
  1396. }
  1397. /**
  1398. * Resets all vertical slides so that only the first
  1399. * is visible.
  1400. */
  1401. function resetVerticalSlides() {
  1402. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1403. horizontalSlides.forEach( function( horizontalSlide ) {
  1404. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1405. verticalSlides.forEach( function( verticalSlide, y ) {
  1406. if( y > 0 ) {
  1407. verticalSlide.classList.remove( 'present' );
  1408. verticalSlide.classList.remove( 'past' );
  1409. verticalSlide.classList.add( 'future' );
  1410. }
  1411. } );
  1412. } );
  1413. }
  1414. /**
  1415. * Sorts and formats all of fragments in the
  1416. * presentation.
  1417. */
  1418. function sortAllFragments() {
  1419. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1420. horizontalSlides.forEach( function( horizontalSlide ) {
  1421. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1422. verticalSlides.forEach( function( verticalSlide, y ) {
  1423. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  1424. } );
  1425. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  1426. } );
  1427. }
  1428. /**
  1429. * Updates one dimension of slides by showing the slide
  1430. * with the specified index.
  1431. *
  1432. * @param {String} selector A CSS selector that will fetch
  1433. * the group of slides we are working with
  1434. * @param {Number} index The index of the slide that should be
  1435. * shown
  1436. *
  1437. * @return {Number} The index of the slide that is now shown,
  1438. * might differ from the passed in index if it was out of
  1439. * bounds.
  1440. */
  1441. function updateSlides( selector, index ) {
  1442. // Select all slides and convert the NodeList result to
  1443. // an array
  1444. var slides = toArray( document.querySelectorAll( selector ) ),
  1445. slidesLength = slides.length;
  1446. var printMode = isPrintingPDF();
  1447. if( slidesLength ) {
  1448. // Should the index loop?
  1449. if( config.loop ) {
  1450. index %= slidesLength;
  1451. if( index < 0 ) {
  1452. index = slidesLength + index;
  1453. }
  1454. }
  1455. // Enforce max and minimum index bounds
  1456. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1457. for( var i = 0; i < slidesLength; i++ ) {
  1458. var element = slides[i];
  1459. var reverse = config.rtl && !isVerticalSlide( element );
  1460. element.classList.remove( 'past' );
  1461. element.classList.remove( 'present' );
  1462. element.classList.remove( 'future' );
  1463. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1464. element.setAttribute( 'hidden', '' );
  1465. // If this element contains vertical slides
  1466. if( element.querySelector( 'section' ) ) {
  1467. element.classList.add( 'stack' );
  1468. }
  1469. // If we're printing static slides, all slides are "present"
  1470. if( printMode ) {
  1471. element.classList.add( 'present' );
  1472. continue;
  1473. }
  1474. if( i < index ) {
  1475. // Any element previous to index is given the 'past' class
  1476. element.classList.add( reverse ? 'future' : 'past' );
  1477. if( config.fragments ) {
  1478. var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
  1479. // Show all fragments on prior slides
  1480. while( pastFragments.length ) {
  1481. var pastFragment = pastFragments.pop();
  1482. pastFragment.classList.add( 'visible' );
  1483. pastFragment.classList.remove( 'current-fragment' );
  1484. }
  1485. }
  1486. }
  1487. else if( i > index ) {
  1488. // Any element subsequent to index is given the 'future' class
  1489. element.classList.add( reverse ? 'past' : 'future' );
  1490. if( config.fragments ) {
  1491. var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1492. // No fragments in future slides should be visible ahead of time
  1493. while( futureFragments.length ) {
  1494. var futureFragment = futureFragments.pop();
  1495. futureFragment.classList.remove( 'visible' );
  1496. futureFragment.classList.remove( 'current-fragment' );
  1497. }
  1498. }
  1499. }
  1500. }
  1501. // Mark the current slide as present
  1502. slides[index].classList.add( 'present' );
  1503. slides[index].removeAttribute( 'hidden' );
  1504. // If this slide has a state associated with it, add it
  1505. // onto the current state of the deck
  1506. var slideState = slides[index].getAttribute( 'data-state' );
  1507. if( slideState ) {
  1508. state = state.concat( slideState.split( ' ' ) );
  1509. }
  1510. }
  1511. else {
  1512. // Since there are no slides we can't be anywhere beyond the
  1513. // zeroth index
  1514. index = 0;
  1515. }
  1516. return index;
  1517. }
  1518. /**
  1519. * Optimization method; hide all slides that are far away
  1520. * from the present slide.
  1521. */
  1522. function updateSlidesVisibility() {
  1523. // Select all slides and convert the NodeList result to
  1524. // an array
  1525. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1526. horizontalSlidesLength = horizontalSlides.length,
  1527. distanceX,
  1528. distanceY;
  1529. if( horizontalSlidesLength ) {
  1530. // The number of steps away from the present slide that will
  1531. // be visible
  1532. var viewDistance = isOverview() ? 10 : config.viewDistance;
  1533. // Limit view distance on weaker devices
  1534. if( isMobileDevice ) {
  1535. viewDistance = isOverview() ? 6 : 1;
  1536. }
  1537. // Limit view distance on weaker devices
  1538. if( isPrintingPDF() ) {
  1539. viewDistance = Number.MAX_VALUE;
  1540. }
  1541. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1542. var horizontalSlide = horizontalSlides[x];
  1543. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1544. verticalSlidesLength = verticalSlides.length;
  1545. // Loops so that it measures 1 between the first and last slides
  1546. distanceX = Math.abs( ( indexh - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1547. // Show the horizontal slide if it's within the view distance
  1548. if( distanceX < viewDistance ) {
  1549. showSlide( horizontalSlide );
  1550. }
  1551. else {
  1552. hideSlide( horizontalSlide );
  1553. }
  1554. if( verticalSlidesLength ) {
  1555. var oy = getPreviousVerticalIndex( horizontalSlide );
  1556. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1557. var verticalSlide = verticalSlides[y];
  1558. distanceY = x === indexh ? Math.abs( indexv - y ) : Math.abs( y - oy );
  1559. if( distanceX + distanceY < viewDistance ) {
  1560. showSlide( verticalSlide );
  1561. }
  1562. else {
  1563. hideSlide( verticalSlide );
  1564. }
  1565. }
  1566. }
  1567. }
  1568. }
  1569. }
  1570. /**
  1571. * Updates the progress bar to reflect the current slide.
  1572. */
  1573. function updateProgress() {
  1574. // Update progress if enabled
  1575. if( config.progress && dom.progress ) {
  1576. dom.progressbar.style.width = getProgress() * window.innerWidth + 'px';
  1577. }
  1578. }
  1579. /**
  1580. * Updates the slide number div to reflect the current slide.
  1581. */
  1582. function updateSlideNumber() {
  1583. // Update slide number if enabled
  1584. if( config.slideNumber && dom.slideNumber) {
  1585. // Display the number of the page using 'indexh - indexv' format
  1586. var indexString = indexh;
  1587. if( indexv > 0 ) {
  1588. indexString += ' - ' + indexv;
  1589. }
  1590. dom.slideNumber.innerHTML = indexString;
  1591. }
  1592. }
  1593. /**
  1594. * Updates the state of all control/navigation arrows.
  1595. */
  1596. function updateControls() {
  1597. var routes = availableRoutes();
  1598. var fragments = availableFragments();
  1599. // Remove the 'enabled' class from all directions
  1600. dom.controlsLeft.concat( dom.controlsRight )
  1601. .concat( dom.controlsUp )
  1602. .concat( dom.controlsDown )
  1603. .concat( dom.controlsPrev )
  1604. .concat( dom.controlsNext ).forEach( function( node ) {
  1605. node.classList.remove( 'enabled' );
  1606. node.classList.remove( 'fragmented' );
  1607. } );
  1608. // Add the 'enabled' class to the available routes
  1609. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1610. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1611. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1612. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1613. // Prev/next buttons
  1614. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1615. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1616. // Highlight fragment directions
  1617. if( currentSlide ) {
  1618. // Always apply fragment decorator to prev/next buttons
  1619. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1620. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1621. // Apply fragment decorators to directional buttons based on
  1622. // what slide axis they are in
  1623. if( isVerticalSlide( currentSlide ) ) {
  1624. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1625. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1626. }
  1627. else {
  1628. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1629. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1630. }
  1631. }
  1632. }
  1633. /**
  1634. * Updates the background elements to reflect the current
  1635. * slide.
  1636. *
  1637. * @param {Boolean} includeAll If true, the backgrounds of
  1638. * all vertical slides (not just the present) will be updated.
  1639. */
  1640. function updateBackground( includeAll ) {
  1641. var currentBackground = null;
  1642. // Reverse past/future classes when in RTL mode
  1643. var horizontalPast = config.rtl ? 'future' : 'past',
  1644. horizontalFuture = config.rtl ? 'past' : 'future';
  1645. // Update the classes of all backgrounds to match the
  1646. // states of their slides (past/present/future)
  1647. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  1648. backgroundh.classList.remove( 'past' );
  1649. backgroundh.classList.remove( 'present' );
  1650. backgroundh.classList.remove( 'future' );
  1651. if( h < indexh ) {
  1652. backgroundh.classList.add( horizontalPast );
  1653. }
  1654. else if ( h > indexh ) {
  1655. backgroundh.classList.add( horizontalFuture );
  1656. }
  1657. else {
  1658. backgroundh.classList.add( 'present' );
  1659. // Store a reference to the current background element
  1660. currentBackground = backgroundh;
  1661. }
  1662. if( includeAll || h === indexh ) {
  1663. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  1664. backgroundv.classList.remove( 'past' );
  1665. backgroundv.classList.remove( 'present' );
  1666. backgroundv.classList.remove( 'future' );
  1667. if( v < indexv ) {
  1668. backgroundv.classList.add( 'past' );
  1669. }
  1670. else if ( v > indexv ) {
  1671. backgroundv.classList.add( 'future' );
  1672. }
  1673. else {
  1674. backgroundv.classList.add( 'present' );
  1675. // Only if this is the present horizontal and vertical slide
  1676. if( h === indexh ) currentBackground = backgroundv;
  1677. }
  1678. } );
  1679. }
  1680. } );
  1681. // Stop any currently playing video background
  1682. if( previousBackground ) {
  1683. var previousVideo = previousBackground.querySelector( 'video' );
  1684. if( previousVideo ) previousVideo.pause();
  1685. }
  1686. if( currentBackground ) {
  1687. // Start video playback
  1688. var currentVideo = currentBackground.querySelector( 'video' );
  1689. if( currentVideo ) currentVideo.play();
  1690. // Don't transition between identical backgrounds. This
  1691. // prevents unwanted flicker.
  1692. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  1693. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  1694. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  1695. dom.background.classList.add( 'no-transition' );
  1696. }
  1697. previousBackground = currentBackground;
  1698. }
  1699. // Allow the first background to apply without transition
  1700. setTimeout( function() {
  1701. dom.background.classList.remove( 'no-transition' );
  1702. }, 1 );
  1703. }
  1704. /**
  1705. * Updates the position of the parallax background based
  1706. * on the current slide index.
  1707. */
  1708. function updateParallax() {
  1709. if( config.parallaxBackgroundImage ) {
  1710. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1711. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1712. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  1713. backgroundWidth, backgroundHeight;
  1714. if( backgroundSize.length === 1 ) {
  1715. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  1716. }
  1717. else {
  1718. backgroundWidth = parseInt( backgroundSize[0], 10 );
  1719. backgroundHeight = parseInt( backgroundSize[1], 10 );
  1720. }
  1721. var slideWidth = dom.background.offsetWidth;
  1722. var horizontalSlideCount = horizontalSlides.length;
  1723. var horizontalOffset = -( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) * indexh;
  1724. var slideHeight = dom.background.offsetHeight;
  1725. var verticalSlideCount = verticalSlides.length;
  1726. var verticalOffset = verticalSlideCount > 1 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0;
  1727. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
  1728. }
  1729. }
  1730. /**
  1731. * Called when the given slide is within the configured view
  1732. * distance. Shows the slide element and loads any content
  1733. * that is set to load lazily (data-src).
  1734. */
  1735. function showSlide( slide ) {
  1736. // Show the slide element
  1737. slide.style.display = 'block';
  1738. // Show the corresponding background element
  1739. var indices = getIndices( slide );
  1740. var background = getSlideBackground( indices.h, indices.v );
  1741. background.style.display = 'block';
  1742. // Media elements with data-src attributes
  1743. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  1744. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  1745. element.removeAttribute( 'data-src' );
  1746. } );
  1747. // Media elements with <source> children
  1748. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  1749. var sources = 0;
  1750. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  1751. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  1752. source.removeAttribute( 'data-src' );
  1753. sources += 1;
  1754. } );
  1755. // If we rewrote sources for this video/audio element, we need
  1756. // to manually tell it to load from its new origin
  1757. if( sources > 0 ) {
  1758. media.load();
  1759. }
  1760. } );
  1761. }
  1762. /**
  1763. * Called when the given slide is moved outside of the
  1764. * configured view distance.
  1765. */
  1766. function hideSlide( slide ) {
  1767. // Hide the slide element
  1768. slide.style.display = 'none';
  1769. // Hide the corresponding background element
  1770. var indices = getIndices( slide );
  1771. var background = getSlideBackground( indices.h, indices.v );
  1772. background.style.display = 'none';
  1773. }
  1774. /**
  1775. * Determine what available routes there are for navigation.
  1776. *
  1777. * @return {Object} containing four booleans: left/right/up/down
  1778. */
  1779. function availableRoutes() {
  1780. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1781. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1782. var routes = {
  1783. left: indexh > 0 || config.loop,
  1784. right: indexh < horizontalSlides.length - 1 || config.loop,
  1785. up: indexv > 0,
  1786. down: indexv < verticalSlides.length - 1
  1787. };
  1788. // reverse horizontal controls for rtl
  1789. if( config.rtl ) {
  1790. var left = routes.left;
  1791. routes.left = routes.right;
  1792. routes.right = left;
  1793. }
  1794. return routes;
  1795. }
  1796. /**
  1797. * Returns an object describing the available fragment
  1798. * directions.
  1799. *
  1800. * @return {Object} two boolean properties: prev/next
  1801. */
  1802. function availableFragments() {
  1803. if( currentSlide && config.fragments ) {
  1804. var fragments = currentSlide.querySelectorAll( '.fragment' );
  1805. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  1806. return {
  1807. prev: fragments.length - hiddenFragments.length > 0,
  1808. next: !!hiddenFragments.length
  1809. };
  1810. }
  1811. else {
  1812. return { prev: false, next: false };
  1813. }
  1814. }
  1815. /**
  1816. * Start playback of any embedded content inside of
  1817. * the targeted slide.
  1818. */
  1819. function startEmbeddedContent( slide ) {
  1820. if( slide && !isSpeakerNotes() ) {
  1821. // HTML5 media elements
  1822. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1823. if( el.hasAttribute( 'data-autoplay' ) ) {
  1824. el.play();
  1825. }
  1826. } );
  1827. // iframe embeds
  1828. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  1829. el.contentWindow.postMessage( 'slide:start', '*' );
  1830. });
  1831. // YouTube embeds
  1832. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1833. if( el.hasAttribute( 'data-autoplay' ) ) {
  1834. el.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  1835. }
  1836. });
  1837. }
  1838. }
  1839. /**
  1840. * Stop playback of any embedded content inside of
  1841. * the targeted slide.
  1842. */
  1843. function stopEmbeddedContent( slide ) {
  1844. if( slide ) {
  1845. // HTML5 media elements
  1846. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1847. if( !el.hasAttribute( 'data-ignore' ) ) {
  1848. el.pause();
  1849. }
  1850. } );
  1851. // iframe embeds
  1852. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  1853. el.contentWindow.postMessage( 'slide:stop', '*' );
  1854. });
  1855. // YouTube embeds
  1856. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1857. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  1858. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  1859. }
  1860. });
  1861. }
  1862. }
  1863. /**
  1864. * Returns a value ranging from 0-1 that represents
  1865. * how far into the presentation we have navigated.
  1866. */
  1867. function getProgress() {
  1868. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1869. // The number of past and total slides
  1870. var totalCount = document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  1871. var pastCount = 0;
  1872. // Step through all slides and count the past ones
  1873. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  1874. var horizontalSlide = horizontalSlides[i];
  1875. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1876. for( var j = 0; j < verticalSlides.length; j++ ) {
  1877. // Stop as soon as we arrive at the present
  1878. if( verticalSlides[j].classList.contains( 'present' ) ) {
  1879. break mainLoop;
  1880. }
  1881. pastCount++;
  1882. }
  1883. // Stop as soon as we arrive at the present
  1884. if( horizontalSlide.classList.contains( 'present' ) ) {
  1885. break;
  1886. }
  1887. // Don't count the wrapping section for vertical slides
  1888. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  1889. pastCount++;
  1890. }
  1891. }
  1892. if( currentSlide ) {
  1893. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  1894. // If there are fragments in the current slide those should be
  1895. // accounted for in the progress.
  1896. if( allFragments.length > 0 ) {
  1897. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  1898. // This value represents how big a portion of the slide progress
  1899. // that is made up by its fragments (0-1)
  1900. var fragmentWeight = 0.9;
  1901. // Add fragment progress to the past slide count
  1902. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  1903. }
  1904. }
  1905. return pastCount / ( totalCount - 1 );
  1906. }
  1907. /**
  1908. * Checks if this presentation is running inside of the
  1909. * speaker notes window.
  1910. */
  1911. function isSpeakerNotes() {
  1912. return !!window.location.search.match( /receiver/gi );
  1913. }
  1914. /**
  1915. * Reads the current URL (hash) and navigates accordingly.
  1916. */
  1917. function readURL() {
  1918. var hash = window.location.hash;
  1919. // Attempt to parse the hash as either an index or name
  1920. var bits = hash.slice( 2 ).split( '/' ),
  1921. name = hash.replace( /#|\//gi, '' );
  1922. // If the first bit is invalid and there is a name we can
  1923. // assume that this is a named link
  1924. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  1925. var element;
  1926. try {
  1927. // Find the slide with the specified name
  1928. element = document.querySelector( '#' + name );
  1929. }
  1930. catch( e ) {
  1931. // If the ID is an invalid selector a harmless SyntaxError
  1932. // may be thrown here.
  1933. }
  1934. if( element ) {
  1935. // Find the position of the named slide and navigate to it
  1936. var indices = Reveal.getIndices( element );
  1937. slide( indices.h, indices.v );
  1938. }
  1939. // If the slide doesn't exist, navigate to the current slide
  1940. else {
  1941. slide( indexh || 0, indexv || 0 );
  1942. }
  1943. }
  1944. else {
  1945. // Read the index components of the hash
  1946. var h = parseInt( bits[0], 10 ) || 0,
  1947. v = parseInt( bits[1], 10 ) || 0;
  1948. if( h !== indexh || v !== indexv ) {
  1949. slide( h, v );
  1950. }
  1951. }
  1952. }
  1953. /**
  1954. * Updates the page URL (hash) to reflect the current
  1955. * state.
  1956. *
  1957. * @param {Number} delay The time in ms to wait before
  1958. * writing the hash
  1959. */
  1960. function writeURL( delay ) {
  1961. if( config.history ) {
  1962. // Make sure there's never more than one timeout running
  1963. clearTimeout( writeURLTimeout );
  1964. // If a delay is specified, timeout this call
  1965. if( typeof delay === 'number' ) {
  1966. writeURLTimeout = setTimeout( writeURL, delay );
  1967. }
  1968. else {
  1969. var url = '/';
  1970. // Attempt to create a named link based on the slide's ID
  1971. var id = currentSlide.getAttribute( 'id' );
  1972. if( id ) {
  1973. id = id.toLowerCase();
  1974. id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
  1975. }
  1976. // If the current slide has an ID, use that as a named link
  1977. if( currentSlide && typeof id === 'string' && id.length ) {
  1978. url = '/' + id;
  1979. }
  1980. // Otherwise use the /h/v index
  1981. else {
  1982. if( indexh > 0 || indexv > 0 ) url += indexh;
  1983. if( indexv > 0 ) url += '/' + indexv;
  1984. }
  1985. window.location.hash = url;
  1986. }
  1987. }
  1988. }
  1989. /**
  1990. * Retrieves the h/v location of the current, or specified,
  1991. * slide.
  1992. *
  1993. * @param {HTMLElement} slide If specified, the returned
  1994. * index will be for this slide rather than the currently
  1995. * active one
  1996. *
  1997. * @return {Object} { h: <int>, v: <int>, f: <int> }
  1998. */
  1999. function getIndices( slide ) {
  2000. // By default, return the current indices
  2001. var h = indexh,
  2002. v = indexv,
  2003. f;
  2004. // If a slide is specified, return the indices of that slide
  2005. if( slide ) {
  2006. var isVertical = isVerticalSlide( slide );
  2007. var slideh = isVertical ? slide.parentNode : slide;
  2008. // Select all horizontal slides
  2009. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2010. // Now that we know which the horizontal slide is, get its index
  2011. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  2012. // Assume we're not vertical
  2013. v = 0;
  2014. // If this is a vertical slide, grab the vertical index
  2015. if( isVertical ) {
  2016. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  2017. }
  2018. }
  2019. if( !slide && currentSlide ) {
  2020. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  2021. if( hasFragments ) {
  2022. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  2023. f = visibleFragments.length - 1;
  2024. }
  2025. }
  2026. return { h: h, v: v, f: f };
  2027. }
  2028. /**
  2029. * Retrieves the total number of slides in this presentation.
  2030. */
  2031. function getTotalSlides() {
  2032. return document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  2033. }
  2034. /**
  2035. * Returns the slide element matching the specified index.
  2036. */
  2037. function getSlide( x, y ) {
  2038. var horizontalSlide = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2039. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2040. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  2041. return verticalSlides ? verticalSlides[ y ] : undefined;
  2042. }
  2043. return horizontalSlide;
  2044. }
  2045. /**
  2046. * Returns the background element for the given slide.
  2047. * All slides, even the ones with no background properties
  2048. * defined, have a background element so this never returns
  2049. * null.
  2050. */
  2051. function getSlideBackground( x, y ) {
  2052. var horizontalBackground = document.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
  2053. var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
  2054. if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
  2055. return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
  2056. }
  2057. return horizontalBackground;
  2058. }
  2059. /**
  2060. * Retrieves the current state of the presentation as
  2061. * an object. This state can then be restored at any
  2062. * time.
  2063. */
  2064. function getState() {
  2065. var indices = getIndices();
  2066. return {
  2067. indexh: indices.h,
  2068. indexv: indices.v,
  2069. indexf: indices.f,
  2070. paused: isPaused(),
  2071. overview: isOverview()
  2072. };
  2073. }
  2074. /**
  2075. * Restores the presentation to the given state.
  2076. *
  2077. * @param {Object} state As generated by getState()
  2078. */
  2079. function setState( state ) {
  2080. if( typeof state === 'object' ) {
  2081. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  2082. var pausedFlag = deserialize( state.paused ),
  2083. overviewFlag = deserialize( state.overview );
  2084. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  2085. togglePause( pausedFlag );
  2086. }
  2087. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  2088. toggleOverview( overviewFlag );
  2089. }
  2090. }
  2091. }
  2092. /**
  2093. * Return a sorted fragments list, ordered by an increasing
  2094. * "data-fragment-index" attribute.
  2095. *
  2096. * Fragments will be revealed in the order that they are returned by
  2097. * this function, so you can use the index attributes to control the
  2098. * order of fragment appearance.
  2099. *
  2100. * To maintain a sensible default fragment order, fragments are presumed
  2101. * to be passed in document order. This function adds a "fragment-index"
  2102. * attribute to each node if such an attribute is not already present,
  2103. * and sets that attribute to an integer value which is the position of
  2104. * the fragment within the fragments list.
  2105. */
  2106. function sortFragments( fragments ) {
  2107. fragments = toArray( fragments );
  2108. var ordered = [],
  2109. unordered = [],
  2110. sorted = [];
  2111. // Group ordered and unordered elements
  2112. fragments.forEach( function( fragment, i ) {
  2113. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  2114. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  2115. if( !ordered[index] ) {
  2116. ordered[index] = [];
  2117. }
  2118. ordered[index].push( fragment );
  2119. }
  2120. else {
  2121. unordered.push( [ fragment ] );
  2122. }
  2123. } );
  2124. // Append fragments without explicit indices in their
  2125. // DOM order
  2126. ordered = ordered.concat( unordered );
  2127. // Manually count the index up per group to ensure there
  2128. // are no gaps
  2129. var index = 0;
  2130. // Push all fragments in their sorted order to an array,
  2131. // this flattens the groups
  2132. ordered.forEach( function( group ) {
  2133. group.forEach( function( fragment ) {
  2134. sorted.push( fragment );
  2135. fragment.setAttribute( 'data-fragment-index', index );
  2136. } );
  2137. index ++;
  2138. } );
  2139. return sorted;
  2140. }
  2141. /**
  2142. * Navigate to the specified slide fragment.
  2143. *
  2144. * @param {Number} index The index of the fragment that
  2145. * should be shown, -1 means all are invisible
  2146. * @param {Number} offset Integer offset to apply to the
  2147. * fragment index
  2148. *
  2149. * @return {Boolean} true if a change was made in any
  2150. * fragments visibility as part of this call
  2151. */
  2152. function navigateFragment( index, offset ) {
  2153. if( currentSlide && config.fragments ) {
  2154. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  2155. if( fragments.length ) {
  2156. // If no index is specified, find the current
  2157. if( typeof index !== 'number' ) {
  2158. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  2159. if( lastVisibleFragment ) {
  2160. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  2161. }
  2162. else {
  2163. index = -1;
  2164. }
  2165. }
  2166. // If an offset is specified, apply it to the index
  2167. if( typeof offset === 'number' ) {
  2168. index += offset;
  2169. }
  2170. var fragmentsShown = [],
  2171. fragmentsHidden = [];
  2172. toArray( fragments ).forEach( function( element, i ) {
  2173. if( element.hasAttribute( 'data-fragment-index' ) ) {
  2174. i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
  2175. }
  2176. // Visible fragments
  2177. if( i <= index ) {
  2178. if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
  2179. element.classList.add( 'visible' );
  2180. element.classList.remove( 'current-fragment' );
  2181. if( i === index ) {
  2182. element.classList.add( 'current-fragment' );
  2183. }
  2184. }
  2185. // Hidden fragments
  2186. else {
  2187. if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
  2188. element.classList.remove( 'visible' );
  2189. element.classList.remove( 'current-fragment' );
  2190. }
  2191. } );
  2192. if( fragmentsHidden.length ) {
  2193. dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
  2194. }
  2195. if( fragmentsShown.length ) {
  2196. dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
  2197. }
  2198. updateControls();
  2199. updateProgress();
  2200. return !!( fragmentsShown.length || fragmentsHidden.length );
  2201. }
  2202. }
  2203. return false;
  2204. }
  2205. /**
  2206. * Navigate to the next slide fragment.
  2207. *
  2208. * @return {Boolean} true if there was a next fragment,
  2209. * false otherwise
  2210. */
  2211. function nextFragment() {
  2212. return navigateFragment( null, 1 );
  2213. }
  2214. /**
  2215. * Navigate to the previous slide fragment.
  2216. *
  2217. * @return {Boolean} true if there was a previous fragment,
  2218. * false otherwise
  2219. */
  2220. function previousFragment() {
  2221. return navigateFragment( null, -1 );
  2222. }
  2223. /**
  2224. * Cues a new automated slide if enabled in the config.
  2225. */
  2226. function cueAutoSlide() {
  2227. cancelAutoSlide();
  2228. if( currentSlide ) {
  2229. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2230. var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null;
  2231. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  2232. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  2233. // Pick value in the following priority order:
  2234. // 1. Current fragment's data-autoslide
  2235. // 2. Current slide's data-autoslide
  2236. // 3. Parent slide's data-autoslide
  2237. // 4. Global autoSlide setting
  2238. if( fragmentAutoSlide ) {
  2239. autoSlide = parseInt( fragmentAutoSlide, 10 );
  2240. }
  2241. else if( slideAutoSlide ) {
  2242. autoSlide = parseInt( slideAutoSlide, 10 );
  2243. }
  2244. else if( parentAutoSlide ) {
  2245. autoSlide = parseInt( parentAutoSlide, 10 );
  2246. }
  2247. else {
  2248. autoSlide = config.autoSlide;
  2249. }
  2250. // If there are media elements with data-autoplay,
  2251. // automatically set the autoSlide duration to the
  2252. // length of that media
  2253. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2254. if( el.hasAttribute( 'data-autoplay' ) ) {
  2255. if( autoSlide && el.duration * 1000 > autoSlide ) {
  2256. autoSlide = ( el.duration * 1000 ) + 1000;
  2257. }
  2258. }
  2259. } );
  2260. // Cue the next auto-slide if:
  2261. // - There is an autoSlide value
  2262. // - Auto-sliding isn't paused by the user
  2263. // - The presentation isn't paused
  2264. // - The overview isn't active
  2265. // - The presentation isn't over
  2266. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || config.loop === true ) ) {
  2267. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  2268. autoSlideStartTime = Date.now();
  2269. }
  2270. if( autoSlidePlayer ) {
  2271. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  2272. }
  2273. }
  2274. }
  2275. /**
  2276. * Cancels any ongoing request to auto-slide.
  2277. */
  2278. function cancelAutoSlide() {
  2279. clearTimeout( autoSlideTimeout );
  2280. autoSlideTimeout = -1;
  2281. }
  2282. function pauseAutoSlide() {
  2283. if( autoSlide && !autoSlidePaused ) {
  2284. autoSlidePaused = true;
  2285. dispatchEvent( 'autoslidepaused' );
  2286. clearTimeout( autoSlideTimeout );
  2287. if( autoSlidePlayer ) {
  2288. autoSlidePlayer.setPlaying( false );
  2289. }
  2290. }
  2291. }
  2292. function resumeAutoSlide() {
  2293. if( autoSlide && autoSlidePaused ) {
  2294. autoSlidePaused = false;
  2295. dispatchEvent( 'autoslideresumed' );
  2296. cueAutoSlide();
  2297. }
  2298. }
  2299. function navigateLeft() {
  2300. // Reverse for RTL
  2301. if( config.rtl ) {
  2302. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  2303. slide( indexh + 1 );
  2304. }
  2305. }
  2306. // Normal navigation
  2307. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  2308. slide( indexh - 1 );
  2309. }
  2310. }
  2311. function navigateRight() {
  2312. // Reverse for RTL
  2313. if( config.rtl ) {
  2314. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  2315. slide( indexh - 1 );
  2316. }
  2317. }
  2318. // Normal navigation
  2319. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  2320. slide( indexh + 1 );
  2321. }
  2322. }
  2323. function navigateUp() {
  2324. // Prioritize hiding fragments
  2325. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  2326. slide( indexh, indexv - 1 );
  2327. }
  2328. }
  2329. function navigateDown() {
  2330. // Prioritize revealing fragments
  2331. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  2332. slide( indexh, indexv + 1 );
  2333. }
  2334. }
  2335. /**
  2336. * Navigates backwards, prioritized in the following order:
  2337. * 1) Previous fragment
  2338. * 2) Previous vertical slide
  2339. * 3) Previous horizontal slide
  2340. */
  2341. function navigatePrev() {
  2342. // Prioritize revealing fragments
  2343. if( previousFragment() === false ) {
  2344. if( availableRoutes().up ) {
  2345. navigateUp();
  2346. }
  2347. else {
  2348. // Fetch the previous horizontal slide, if there is one
  2349. var previousSlide = document.querySelector( HORIZONTAL_SLIDES_SELECTOR + '.past:nth-child(' + indexh + ')' );
  2350. if( previousSlide ) {
  2351. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  2352. var h = indexh - 1;
  2353. slide( h, v );
  2354. }
  2355. }
  2356. }
  2357. }
  2358. /**
  2359. * Same as #navigatePrev() but navigates forwards.
  2360. */
  2361. function navigateNext() {
  2362. // Prioritize revealing fragments
  2363. if( nextFragment() === false ) {
  2364. availableRoutes().down ? navigateDown() : navigateRight();
  2365. }
  2366. // If auto-sliding is enabled we need to cue up
  2367. // another timeout
  2368. cueAutoSlide();
  2369. }
  2370. // --------------------------------------------------------------------//
  2371. // ----------------------------- EVENTS -------------------------------//
  2372. // --------------------------------------------------------------------//
  2373. /**
  2374. * Called by all event handlers that are based on user
  2375. * input.
  2376. */
  2377. function onUserInput( event ) {
  2378. if( config.autoSlideStoppable ) {
  2379. pauseAutoSlide();
  2380. }
  2381. }
  2382. /**
  2383. * Handler for the document level 'keydown' event.
  2384. */
  2385. function onDocumentKeyDown( event ) {
  2386. // If there's a condition specified and it returns false,
  2387. // ignore this event
  2388. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
  2389. return true;
  2390. }
  2391. // Remember if auto-sliding was paused so we can toggle it
  2392. var autoSlideWasPaused = autoSlidePaused;
  2393. onUserInput( event );
  2394. // Check if there's a focused element that could be using
  2395. // the keyboard
  2396. var activeElement = document.activeElement;
  2397. var hasFocus = !!( document.activeElement && ( document.activeElement.type || document.activeElement.href || document.activeElement.contentEditable !== 'inherit' ) );
  2398. // Disregard the event if there's a focused element or a
  2399. // keyboard modifier key is present
  2400. if( hasFocus || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  2401. // While paused only allow "unpausing" keyboard events (b and .)
  2402. if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) {
  2403. return false;
  2404. }
  2405. var triggered = false;
  2406. // 1. User defined key bindings
  2407. if( typeof config.keyboard === 'object' ) {
  2408. for( var key in config.keyboard ) {
  2409. // Check if this binding matches the pressed key
  2410. if( parseInt( key, 10 ) === event.keyCode ) {
  2411. var value = config.keyboard[ key ];
  2412. // Callback function
  2413. if( typeof value === 'function' ) {
  2414. value.apply( null, [ event ] );
  2415. }
  2416. // String shortcuts to reveal.js API
  2417. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  2418. Reveal[ value ].call();
  2419. }
  2420. triggered = true;
  2421. }
  2422. }
  2423. }
  2424. // 2. System defined key bindings
  2425. if( triggered === false ) {
  2426. // Assume true and try to prove false
  2427. triggered = true;
  2428. switch( event.keyCode ) {
  2429. // p, page up
  2430. case 80: case 33: navigatePrev(); break;
  2431. // n, page down
  2432. case 78: case 34: navigateNext(); break;
  2433. // h, left
  2434. case 72: case 37: navigateLeft(); break;
  2435. // l, right
  2436. case 76: case 39: navigateRight(); break;
  2437. // k, up
  2438. case 75: case 38: navigateUp(); break;
  2439. // j, down
  2440. case 74: case 40: navigateDown(); break;
  2441. // home
  2442. case 36: slide( 0 ); break;
  2443. // end
  2444. case 35: slide( Number.MAX_VALUE ); break;
  2445. // space
  2446. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  2447. // return
  2448. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  2449. // two-spot, semicolon, b, period, Logitech presenter tools "black screen" button
  2450. case 58: case 59: case 66: case 190: case 191: togglePause(); break;
  2451. // f
  2452. case 70: enterFullscreen(); break;
  2453. // a
  2454. case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
  2455. default:
  2456. triggered = false;
  2457. }
  2458. }
  2459. // If the input resulted in a triggered action we should prevent
  2460. // the browsers default behavior
  2461. if( triggered ) {
  2462. event.preventDefault();
  2463. }
  2464. // ESC or O key
  2465. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  2466. if( dom.preview ) {
  2467. closePreview();
  2468. }
  2469. else {
  2470. toggleOverview();
  2471. }
  2472. event.preventDefault();
  2473. }
  2474. // If auto-sliding is enabled we need to cue up
  2475. // another timeout
  2476. cueAutoSlide();
  2477. }
  2478. /**
  2479. * Handler for the 'touchstart' event, enables support for
  2480. * swipe and pinch gestures.
  2481. */
  2482. function onTouchStart( event ) {
  2483. touch.startX = event.touches[0].clientX;
  2484. touch.startY = event.touches[0].clientY;
  2485. touch.startCount = event.touches.length;
  2486. // If there's two touches we need to memorize the distance
  2487. // between those two points to detect pinching
  2488. if( event.touches.length === 2 && config.overview ) {
  2489. touch.startSpan = distanceBetween( {
  2490. x: event.touches[1].clientX,
  2491. y: event.touches[1].clientY
  2492. }, {
  2493. x: touch.startX,
  2494. y: touch.startY
  2495. } );
  2496. }
  2497. }
  2498. /**
  2499. * Handler for the 'touchmove' event.
  2500. */
  2501. function onTouchMove( event ) {
  2502. // Each touch should only trigger one action
  2503. if( !touch.captured ) {
  2504. onUserInput( event );
  2505. var currentX = event.touches[0].clientX;
  2506. var currentY = event.touches[0].clientY;
  2507. // If the touch started with two points and still has
  2508. // two active touches; test for the pinch gesture
  2509. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  2510. // The current distance in pixels between the two touch points
  2511. var currentSpan = distanceBetween( {
  2512. x: event.touches[1].clientX,
  2513. y: event.touches[1].clientY
  2514. }, {
  2515. x: touch.startX,
  2516. y: touch.startY
  2517. } );
  2518. // If the span is larger than the desire amount we've got
  2519. // ourselves a pinch
  2520. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  2521. touch.captured = true;
  2522. if( currentSpan < touch.startSpan ) {
  2523. activateOverview();
  2524. }
  2525. else {
  2526. deactivateOverview();
  2527. }
  2528. }
  2529. event.preventDefault();
  2530. }
  2531. // There was only one touch point, look for a swipe
  2532. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  2533. var deltaX = currentX - touch.startX,
  2534. deltaY = currentY - touch.startY;
  2535. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2536. touch.captured = true;
  2537. navigateLeft();
  2538. }
  2539. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2540. touch.captured = true;
  2541. navigateRight();
  2542. }
  2543. else if( deltaY > touch.threshold ) {
  2544. touch.captured = true;
  2545. navigateUp();
  2546. }
  2547. else if( deltaY < -touch.threshold ) {
  2548. touch.captured = true;
  2549. navigateDown();
  2550. }
  2551. // If we're embedded, only block touch events if they have
  2552. // triggered an action
  2553. if( config.embedded ) {
  2554. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  2555. event.preventDefault();
  2556. }
  2557. }
  2558. // Not embedded? Block them all to avoid needless tossing
  2559. // around of the viewport in iOS
  2560. else {
  2561. event.preventDefault();
  2562. }
  2563. }
  2564. }
  2565. // There's a bug with swiping on some Android devices unless
  2566. // the default action is always prevented
  2567. else if( navigator.userAgent.match( /android/gi ) ) {
  2568. event.preventDefault();
  2569. }
  2570. }
  2571. /**
  2572. * Handler for the 'touchend' event.
  2573. */
  2574. function onTouchEnd( event ) {
  2575. touch.captured = false;
  2576. }
  2577. /**
  2578. * Convert pointer down to touch start.
  2579. */
  2580. function onPointerDown( event ) {
  2581. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2582. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2583. onTouchStart( event );
  2584. }
  2585. }
  2586. /**
  2587. * Convert pointer move to touch move.
  2588. */
  2589. function onPointerMove( event ) {
  2590. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2591. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2592. onTouchMove( event );
  2593. }
  2594. }
  2595. /**
  2596. * Convert pointer up to touch end.
  2597. */
  2598. function onPointerUp( event ) {
  2599. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2600. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2601. onTouchEnd( event );
  2602. }
  2603. }
  2604. /**
  2605. * Handles mouse wheel scrolling, throttled to avoid skipping
  2606. * multiple slides.
  2607. */
  2608. function onDocumentMouseScroll( event ) {
  2609. if( Date.now() - lastMouseWheelStep > 600 ) {
  2610. lastMouseWheelStep = Date.now();
  2611. var delta = event.detail || -event.wheelDelta;
  2612. if( delta > 0 ) {
  2613. navigateNext();
  2614. }
  2615. else {
  2616. navigatePrev();
  2617. }
  2618. }
  2619. }
  2620. /**
  2621. * Clicking on the progress bar results in a navigation to the
  2622. * closest approximate horizontal slide using this equation:
  2623. *
  2624. * ( clickX / presentationWidth ) * numberOfSlides
  2625. */
  2626. function onProgressClicked( event ) {
  2627. onUserInput( event );
  2628. event.preventDefault();
  2629. var slidesTotal = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  2630. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  2631. slide( slideIndex );
  2632. }
  2633. /**
  2634. * Event handler for navigation control buttons.
  2635. */
  2636. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  2637. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  2638. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  2639. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  2640. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  2641. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  2642. /**
  2643. * Handler for the window level 'hashchange' event.
  2644. */
  2645. function onWindowHashChange( event ) {
  2646. readURL();
  2647. }
  2648. /**
  2649. * Handler for the window level 'resize' event.
  2650. */
  2651. function onWindowResize( event ) {
  2652. layout();
  2653. }
  2654. /**
  2655. * Handle for the window level 'visibilitychange' event.
  2656. */
  2657. function onPageVisibilityChange( event ) {
  2658. var isHidden = document.webkitHidden ||
  2659. document.msHidden ||
  2660. document.hidden;
  2661. // If, after clicking a link or similar and we're coming back,
  2662. // focus the document.body to ensure we can use keyboard shortcuts
  2663. if( isHidden === false && document.activeElement !== document.body ) {
  2664. document.activeElement.blur();
  2665. document.body.focus();
  2666. }
  2667. }
  2668. /**
  2669. * Invoked when a slide is and we're in the overview.
  2670. */
  2671. function onOverviewSlideClicked( event ) {
  2672. // TODO There's a bug here where the event listeners are not
  2673. // removed after deactivating the overview.
  2674. if( eventsAreBound && isOverview() ) {
  2675. event.preventDefault();
  2676. var element = event.target;
  2677. while( element && !element.nodeName.match( /section/gi ) ) {
  2678. element = element.parentNode;
  2679. }
  2680. if( element && !element.classList.contains( 'disabled' ) ) {
  2681. deactivateOverview();
  2682. if( element.nodeName.match( /section/gi ) ) {
  2683. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  2684. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  2685. slide( h, v );
  2686. }
  2687. }
  2688. }
  2689. }
  2690. /**
  2691. * Handles clicks on links that are set to preview in the
  2692. * iframe overlay.
  2693. */
  2694. function onPreviewLinkClicked( event ) {
  2695. var url = event.target.getAttribute( 'href' );
  2696. if( url ) {
  2697. openPreview( url );
  2698. event.preventDefault();
  2699. }
  2700. }
  2701. /**
  2702. * Handles click on the auto-sliding controls element.
  2703. */
  2704. function onAutoSlidePlayerClick( event ) {
  2705. // Replay
  2706. if( Reveal.isLastSlide() && config.loop === false ) {
  2707. slide( 0, 0 );
  2708. resumeAutoSlide();
  2709. }
  2710. // Resume
  2711. else if( autoSlidePaused ) {
  2712. resumeAutoSlide();
  2713. }
  2714. // Pause
  2715. else {
  2716. pauseAutoSlide();
  2717. }
  2718. }
  2719. // --------------------------------------------------------------------//
  2720. // ------------------------ PLAYBACK COMPONENT ------------------------//
  2721. // --------------------------------------------------------------------//
  2722. /**
  2723. * Constructor for the playback component, which displays
  2724. * play/pause/progress controls.
  2725. *
  2726. * @param {HTMLElement} container The component will append
  2727. * itself to this
  2728. * @param {Function} progressCheck A method which will be
  2729. * called frequently to get the current progress on a range
  2730. * of 0-1
  2731. */
  2732. function Playback( container, progressCheck ) {
  2733. // Cosmetics
  2734. this.diameter = 50;
  2735. this.thickness = 3;
  2736. // Flags if we are currently playing
  2737. this.playing = false;
  2738. // Current progress on a 0-1 range
  2739. this.progress = 0;
  2740. // Used to loop the animation smoothly
  2741. this.progressOffset = 1;
  2742. this.container = container;
  2743. this.progressCheck = progressCheck;
  2744. this.canvas = document.createElement( 'canvas' );
  2745. this.canvas.className = 'playback';
  2746. this.canvas.width = this.diameter;
  2747. this.canvas.height = this.diameter;
  2748. this.context = this.canvas.getContext( '2d' );
  2749. this.container.appendChild( this.canvas );
  2750. this.render();
  2751. }
  2752. Playback.prototype.setPlaying = function( value ) {
  2753. var wasPlaying = this.playing;
  2754. this.playing = value;
  2755. // Start repainting if we weren't already
  2756. if( !wasPlaying && this.playing ) {
  2757. this.animate();
  2758. }
  2759. else {
  2760. this.render();
  2761. }
  2762. };
  2763. Playback.prototype.animate = function() {
  2764. var progressBefore = this.progress;
  2765. this.progress = this.progressCheck();
  2766. // When we loop, offset the progress so that it eases
  2767. // smoothly rather than immediately resetting
  2768. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  2769. this.progressOffset = this.progress;
  2770. }
  2771. this.render();
  2772. if( this.playing ) {
  2773. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  2774. }
  2775. };
  2776. /**
  2777. * Renders the current progress and playback state.
  2778. */
  2779. Playback.prototype.render = function() {
  2780. var progress = this.playing ? this.progress : 0,
  2781. radius = ( this.diameter / 2 ) - this.thickness,
  2782. x = this.diameter / 2,
  2783. y = this.diameter / 2,
  2784. iconSize = 14;
  2785. // Ease towards 1
  2786. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  2787. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  2788. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  2789. this.context.save();
  2790. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  2791. // Solid background color
  2792. this.context.beginPath();
  2793. this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false );
  2794. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  2795. this.context.fill();
  2796. // Draw progress track
  2797. this.context.beginPath();
  2798. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  2799. this.context.lineWidth = this.thickness;
  2800. this.context.strokeStyle = '#666';
  2801. this.context.stroke();
  2802. if( this.playing ) {
  2803. // Draw progress on top of track
  2804. this.context.beginPath();
  2805. this.context.arc( x, y, radius, startAngle, endAngle, false );
  2806. this.context.lineWidth = this.thickness;
  2807. this.context.strokeStyle = '#fff';
  2808. this.context.stroke();
  2809. }
  2810. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  2811. // Draw play/pause icons
  2812. if( this.playing ) {
  2813. this.context.fillStyle = '#fff';
  2814. this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize );
  2815. this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize );
  2816. }
  2817. else {
  2818. this.context.beginPath();
  2819. this.context.translate( 2, 0 );
  2820. this.context.moveTo( 0, 0 );
  2821. this.context.lineTo( iconSize - 2, iconSize / 2 );
  2822. this.context.lineTo( 0, iconSize );
  2823. this.context.fillStyle = '#fff';
  2824. this.context.fill();
  2825. }
  2826. this.context.restore();
  2827. };
  2828. Playback.prototype.on = function( type, listener ) {
  2829. this.canvas.addEventListener( type, listener, false );
  2830. };
  2831. Playback.prototype.off = function( type, listener ) {
  2832. this.canvas.removeEventListener( type, listener, false );
  2833. };
  2834. Playback.prototype.destroy = function() {
  2835. this.playing = false;
  2836. if( this.canvas.parentNode ) {
  2837. this.container.removeChild( this.canvas );
  2838. }
  2839. };
  2840. // --------------------------------------------------------------------//
  2841. // ------------------------------- API --------------------------------//
  2842. // --------------------------------------------------------------------//
  2843. return {
  2844. initialize: initialize,
  2845. configure: configure,
  2846. sync: sync,
  2847. // Navigation methods
  2848. slide: slide,
  2849. left: navigateLeft,
  2850. right: navigateRight,
  2851. up: navigateUp,
  2852. down: navigateDown,
  2853. prev: navigatePrev,
  2854. next: navigateNext,
  2855. // Fragment methods
  2856. navigateFragment: navigateFragment,
  2857. prevFragment: previousFragment,
  2858. nextFragment: nextFragment,
  2859. // Deprecated aliases
  2860. navigateTo: slide,
  2861. navigateLeft: navigateLeft,
  2862. navigateRight: navigateRight,
  2863. navigateUp: navigateUp,
  2864. navigateDown: navigateDown,
  2865. navigatePrev: navigatePrev,
  2866. navigateNext: navigateNext,
  2867. // Forces an update in slide layout
  2868. layout: layout,
  2869. // Returns an object with the available routes as booleans (left/right/top/bottom)
  2870. availableRoutes: availableRoutes,
  2871. // Returns an object with the available fragments as booleans (prev/next)
  2872. availableFragments: availableFragments,
  2873. // Toggles the overview mode on/off
  2874. toggleOverview: toggleOverview,
  2875. // Toggles the "black screen" mode on/off
  2876. togglePause: togglePause,
  2877. // Toggles the auto slide mode on/off
  2878. toggleAutoSlide: toggleAutoSlide,
  2879. // State checks
  2880. isOverview: isOverview,
  2881. isPaused: isPaused,
  2882. isAutoSliding: isAutoSliding,
  2883. // Adds or removes all internal event listeners (such as keyboard)
  2884. addEventListeners: addEventListeners,
  2885. removeEventListeners: removeEventListeners,
  2886. // Facility for persisting and restoring the presentation state
  2887. getState: getState,
  2888. setState: setState,
  2889. // Presentation progress on range of 0-1
  2890. getProgress: getProgress,
  2891. // Returns the indices of the current, or specified, slide
  2892. getIndices: getIndices,
  2893. getTotalSlides: getTotalSlides,
  2894. // Returns the slide element at the specified index
  2895. getSlide: getSlide,
  2896. // Returns the slide background element at the specified index
  2897. getSlideBackground: getSlideBackground,
  2898. // Returns the previous slide element, may be null
  2899. getPreviousSlide: function() {
  2900. return previousSlide;
  2901. },
  2902. // Returns the current slide element
  2903. getCurrentSlide: function() {
  2904. return currentSlide;
  2905. },
  2906. // Returns the current scale of the presentation content
  2907. getScale: function() {
  2908. return scale;
  2909. },
  2910. // Returns the current configuration object
  2911. getConfig: function() {
  2912. return config;
  2913. },
  2914. // Helper method, retrieves query string as a key/value hash
  2915. getQueryHash: function() {
  2916. var query = {};
  2917. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  2918. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  2919. } );
  2920. // Basic deserialization
  2921. for( var i in query ) {
  2922. var value = query[ i ];
  2923. query[ i ] = deserialize( unescape( value ) );
  2924. }
  2925. return query;
  2926. },
  2927. // Returns true if we're currently on the first slide
  2928. isFirstSlide: function() {
  2929. return document.querySelector( SLIDES_SELECTOR + '.past' ) == null ? true : false;
  2930. },
  2931. // Returns true if we're currently on the last slide
  2932. isLastSlide: function() {
  2933. if( currentSlide ) {
  2934. // Does this slide has next a sibling?
  2935. if( currentSlide.nextElementSibling ) return false;
  2936. // If it's vertical, does its parent have a next sibling?
  2937. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  2938. return true;
  2939. }
  2940. return false;
  2941. },
  2942. // Checks if reveal.js has been loaded and is ready for use
  2943. isReady: function() {
  2944. return loaded;
  2945. },
  2946. // Forward event binding to the reveal DOM element
  2947. addEventListener: function( type, listener, useCapture ) {
  2948. if( 'addEventListener' in window ) {
  2949. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  2950. }
  2951. },
  2952. removeEventListener: function( type, listener, useCapture ) {
  2953. if( 'addEventListener' in window ) {
  2954. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  2955. }
  2956. },
  2957. // Programatically triggers a keyboard event
  2958. triggerKey: function( keyCode ) {
  2959. onDocumentKeyDown( { keyCode: keyCode } );
  2960. }
  2961. };
  2962. })();