reveal.js 83 KB

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