reveal.js 105 KB

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  1. /*!
  2. * reveal.js
  3. * http://lab.hakim.se/reveal-js
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2014 Hakim El Hattab, http://hakim.se
  7. */
  8. (function( root, factory ) {
  9. if( typeof define === 'function' && define.amd ) {
  10. // AMD. Register as an anonymous module.
  11. define( function() {
  12. root.Reveal = factory();
  13. return root.Reveal;
  14. } );
  15. } else if( typeof exports === 'object' ) {
  16. // Node. Does not work with strict CommonJS.
  17. module.exports = factory();
  18. } else {
  19. // Browser globals.
  20. root.Reveal = factory();
  21. }
  22. }( this, function() {
  23. 'use strict';
  24. var Reveal;
  25. var SLIDES_SELECTOR = '.reveal .slides section',
  26. HORIZONTAL_SLIDES_SELECTOR = '.reveal .slides>section',
  27. VERTICAL_SLIDES_SELECTOR = '.reveal .slides>section.present>section',
  28. HOME_SLIDE_SELECTOR = '.reveal .slides>section:first-of-type',
  29. // Configurations defaults, can be overridden at initialization time
  30. config = {
  31. // The "normal" size of the presentation, aspect ratio will be preserved
  32. // when the presentation is scaled to fit different resolutions
  33. width: 960,
  34. height: 700,
  35. // Factor of the display size that should remain empty around the content
  36. margin: 0.1,
  37. // Bounds for smallest/largest possible scale to apply to content
  38. minScale: 0.2,
  39. maxScale: 1.0,
  40. // Display controls in the bottom right corner
  41. controls: true,
  42. // Display a presentation progress bar
  43. progress: true,
  44. // Display the page number of the current slide
  45. slideNumber: false,
  46. // Push each slide change to the browser history
  47. history: false,
  48. // Enable keyboard shortcuts for navigation
  49. keyboard: true,
  50. // Optional function that blocks keyboard events when retuning false
  51. keyboardCondition: null,
  52. // Enable the slide overview mode
  53. overview: true,
  54. // Vertical centering of slides
  55. center: true,
  56. // Enables touch navigation on devices with touch input
  57. touch: true,
  58. // Loop the presentation
  59. loop: false,
  60. // Change the presentation direction to be RTL
  61. rtl: false,
  62. // Turns fragments on and off globally
  63. fragments: true,
  64. // Flags if the presentation is running in an embedded mode,
  65. // i.e. contained within a limited portion of the screen
  66. embedded: false,
  67. // Number of milliseconds between automatically proceeding to the
  68. // next slide, disabled when set to 0, this value can be overwritten
  69. // by using a data-autoslide attribute on your slides
  70. autoSlide: 0,
  71. // Stop auto-sliding after user input
  72. autoSlideStoppable: true,
  73. // Enable slide navigation via mouse wheel
  74. mouseWheel: false,
  75. // Apply a 3D roll to links on hover
  76. rollingLinks: false,
  77. // Hides the address bar on mobile devices
  78. hideAddressBar: true,
  79. // Opens links in an iframe preview overlay
  80. previewLinks: false,
  81. // Exposes the reveal.js API through window.postMessage
  82. postMessage: true,
  83. // Dispatches all reveal.js events to the parent window through postMessage
  84. postMessageEvents: false,
  85. // Focuses body when page changes visiblity to ensure keyboard shortcuts work
  86. focusBodyOnPageVisiblityChange: true,
  87. // Theme (see /css/theme)
  88. theme: null,
  89. // Transition style
  90. transition: 'default', // none/fade/slide/convex/concave/zoom
  91. // Transition speed
  92. transitionSpeed: 'default', // default/fast/slow
  93. // Transition style for full page slide backgrounds
  94. backgroundTransition: 'default', // none/fade/slide/convex/concave/zoom
  95. // Parallax background image
  96. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  97. // Parallax background size
  98. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  99. // Number of slides away from the current that are visible
  100. viewDistance: 3,
  101. // Script dependencies to load
  102. dependencies: []
  103. },
  104. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  105. loaded = false,
  106. // The horizontal and vertical index of the currently active slide
  107. indexh,
  108. indexv,
  109. // The previous and current slide HTML elements
  110. previousSlide,
  111. currentSlide,
  112. previousBackground,
  113. // Slides may hold a data-state attribute which we pick up and apply
  114. // as a class to the body. This list contains the combined state of
  115. // all current slides.
  116. state = [],
  117. // The current scale of the presentation (see width/height config)
  118. scale = 1,
  119. // Cached references to DOM elements
  120. dom = {},
  121. // Features supported by the browser, see #checkCapabilities()
  122. features = {},
  123. // Client is a mobile device, see #checkCapabilities()
  124. isMobileDevice,
  125. // Throttles mouse wheel navigation
  126. lastMouseWheelStep = 0,
  127. // Delays updates to the URL due to a Chrome thumbnailer bug
  128. writeURLTimeout = 0,
  129. // Flags if the interaction event listeners are bound
  130. eventsAreBound = false,
  131. // The current auto-slide duration
  132. autoSlide = 0,
  133. // Auto slide properties
  134. autoSlidePlayer,
  135. autoSlideTimeout = 0,
  136. autoSlideStartTime = -1,
  137. autoSlidePaused = false,
  138. // Holds information about the currently ongoing touch input
  139. touch = {
  140. startX: 0,
  141. startY: 0,
  142. startSpan: 0,
  143. startCount: 0,
  144. captured: false,
  145. threshold: 40
  146. };
  147. /**
  148. * Starts up the presentation if the client is capable.
  149. */
  150. function initialize( options ) {
  151. checkCapabilities();
  152. if( !features.transforms2d && !features.transforms3d ) {
  153. document.body.setAttribute( 'class', 'no-transforms' );
  154. // Since JS won't be running any further, we need to load all
  155. // images that were intended to lazy load now
  156. var images = document.getElementsByTagName( 'img' );
  157. for( var i = 0, len = images.length; i < len; i++ ) {
  158. var image = images[i];
  159. if( image.getAttribute( 'data-src' ) ) {
  160. image.setAttribute( 'src', image.getAttribute( 'data-src' ) );
  161. image.removeAttribute( 'data-src' );
  162. }
  163. }
  164. // If the browser doesn't support core features we won't be
  165. // using JavaScript to control the presentation
  166. return;
  167. }
  168. // Force a layout when the whole page, incl fonts, has loaded
  169. window.addEventListener( 'load', layout, false );
  170. var query = Reveal.getQueryHash();
  171. // Do not accept new dependencies via query config to avoid
  172. // the potential of malicious script injection
  173. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  174. // Copy options over to our config object
  175. extend( config, options );
  176. extend( config, query );
  177. // Hide the address bar in mobile browsers
  178. hideAddressBar();
  179. // Loads the dependencies and continues to #start() once done
  180. load();
  181. }
  182. /**
  183. * Inspect the client to see what it's capable of, this
  184. * should only happens once per runtime.
  185. */
  186. function checkCapabilities() {
  187. features.transforms3d = 'WebkitPerspective' in document.body.style ||
  188. 'MozPerspective' in document.body.style ||
  189. 'msPerspective' in document.body.style ||
  190. 'OPerspective' in document.body.style ||
  191. 'perspective' in document.body.style;
  192. features.transforms2d = 'WebkitTransform' in document.body.style ||
  193. 'MozTransform' in document.body.style ||
  194. 'msTransform' in document.body.style ||
  195. 'OTransform' in document.body.style ||
  196. 'transform' in document.body.style;
  197. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  198. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  199. features.canvas = !!document.createElement( 'canvas' ).getContext;
  200. isMobileDevice = navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi );
  201. }
  202. /**
  203. * Loads the dependencies of reveal.js. Dependencies are
  204. * defined via the configuration option 'dependencies'
  205. * and will be loaded prior to starting/binding reveal.js.
  206. * Some dependencies may have an 'async' flag, if so they
  207. * will load after reveal.js has been started up.
  208. */
  209. function load() {
  210. var scripts = [],
  211. scriptsAsync = [],
  212. scriptsToPreload = 0;
  213. // Called once synchronous scripts finish loading
  214. function proceed() {
  215. if( scriptsAsync.length ) {
  216. // Load asynchronous scripts
  217. head.js.apply( null, scriptsAsync );
  218. }
  219. start();
  220. }
  221. function loadScript( s ) {
  222. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
  223. // Extension may contain callback functions
  224. if( typeof s.callback === 'function' ) {
  225. s.callback.apply( this );
  226. }
  227. if( --scriptsToPreload === 0 ) {
  228. proceed();
  229. }
  230. });
  231. }
  232. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  233. var s = config.dependencies[i];
  234. // Load if there's no condition or the condition is truthy
  235. if( !s.condition || s.condition() ) {
  236. if( s.async ) {
  237. scriptsAsync.push( s.src );
  238. }
  239. else {
  240. scripts.push( s.src );
  241. }
  242. loadScript( s );
  243. }
  244. }
  245. if( scripts.length ) {
  246. scriptsToPreload = scripts.length;
  247. // Load synchronous scripts
  248. head.js.apply( null, scripts );
  249. }
  250. else {
  251. proceed();
  252. }
  253. }
  254. /**
  255. * Starts up reveal.js by binding input events and navigating
  256. * to the current URL deeplink if there is one.
  257. */
  258. function start() {
  259. // Make sure we've got all the DOM elements we need
  260. setupDOM();
  261. // Listen to messages posted to this window
  262. setupPostMessage();
  263. // Resets all vertical slides so that only the first is visible
  264. resetVerticalSlides();
  265. // Updates the presentation to match the current configuration values
  266. configure();
  267. // Read the initial hash
  268. readURL();
  269. // Update all backgrounds
  270. updateBackground( true );
  271. // Notify listeners that the presentation is ready but use a 1ms
  272. // timeout to ensure it's not fired synchronously after #initialize()
  273. setTimeout( function() {
  274. // Enable transitions now that we're loaded
  275. dom.slides.classList.remove( 'no-transition' );
  276. loaded = true;
  277. dispatchEvent( 'ready', {
  278. 'indexh': indexh,
  279. 'indexv': indexv,
  280. 'currentSlide': currentSlide
  281. } );
  282. }, 1 );
  283. // Special setup and config is required when printing to PDF
  284. if( isPrintingPDF() ) {
  285. removeEventListeners();
  286. // The document needs to have loaded for the PDF layout
  287. // measurements to be accurate
  288. if( document.readyState === 'complete' ) {
  289. setupPDF();
  290. }
  291. else {
  292. window.addEventListener( 'load', setupPDF );
  293. }
  294. }
  295. }
  296. /**
  297. * Finds and stores references to DOM elements which are
  298. * required by the presentation. If a required element is
  299. * not found, it is created.
  300. */
  301. function setupDOM() {
  302. // Cache references to key DOM elements
  303. dom.theme = document.querySelector( '#theme' );
  304. dom.wrapper = document.querySelector( '.reveal' );
  305. dom.slides = document.querySelector( '.reveal .slides' );
  306. // Prevent transitions while we're loading
  307. dom.slides.classList.add( 'no-transition' );
  308. // Background element
  309. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  310. // Progress bar
  311. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  312. dom.progressbar = dom.progress.querySelector( 'span' );
  313. // Arrow controls
  314. createSingletonNode( dom.wrapper, 'aside', 'controls',
  315. '<div class="navigate-left"></div>' +
  316. '<div class="navigate-right"></div>' +
  317. '<div class="navigate-up"></div>' +
  318. '<div class="navigate-down"></div>' );
  319. // Slide number
  320. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  321. // State background element [DEPRECATED]
  322. createSingletonNode( dom.wrapper, 'div', 'state-background', null );
  323. // Overlay graphic which is displayed during the paused mode
  324. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  325. // Cache references to elements
  326. dom.controls = document.querySelector( '.reveal .controls' );
  327. // There can be multiple instances of controls throughout the page
  328. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  329. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  330. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  331. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  332. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  333. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  334. }
  335. /**
  336. * Configures the presentation for printing to a static
  337. * PDF.
  338. */
  339. function setupPDF() {
  340. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  341. // Dimensions of the PDF pages
  342. var pageWidth = Math.ceil( slideSize.width * ( 1 + config.margin ) ),
  343. pageHeight = Math.ceil( slideSize.height * ( 1 + config.margin ) );
  344. // Dimensions of slides within the pages
  345. var slideWidth = slideSize.width,
  346. slideHeight = slideSize.height;
  347. // Let the browser know what page size we want to print
  348. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' );
  349. // Limit the size of certain elements to the dimensions of the slide
  350. injectStyleSheet( '.reveal img, .reveal video, .reveal iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  351. document.body.classList.add( 'print-pdf' );
  352. document.body.style.width = pageWidth + 'px';
  353. document.body.style.height = pageHeight + 'px';
  354. // Slide and slide background layout
  355. toArray( document.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  356. // Vertical stacks are not centred since their section
  357. // children will be
  358. if( slide.classList.contains( 'stack' ) === false ) {
  359. // Center the slide inside of the page, giving the slide some margin
  360. var left = ( pageWidth - slideWidth ) / 2,
  361. top = ( pageHeight - slideHeight ) / 2;
  362. var contentHeight = getAbsoluteHeight( slide );
  363. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  364. // Center slides vertically
  365. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  366. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  367. }
  368. // Position the slide inside of the page
  369. slide.style.left = left + 'px';
  370. slide.style.top = top + 'px';
  371. slide.style.width = slideWidth + 'px';
  372. // TODO Backgrounds need to be multiplied when the slide
  373. // stretches over multiple pages
  374. var background = slide.querySelector( '.slide-background' );
  375. if( background ) {
  376. background.style.width = pageWidth + 'px';
  377. background.style.height = ( pageHeight * numberOfPages ) + 'px';
  378. background.style.top = -top + 'px';
  379. background.style.left = -left + 'px';
  380. }
  381. }
  382. } );
  383. // Show all fragments
  384. toArray( document.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
  385. fragment.classList.add( 'visible' );
  386. } );
  387. }
  388. /**
  389. * Creates an HTML element and returns a reference to it.
  390. * If the element already exists the existing instance will
  391. * be returned.
  392. */
  393. function createSingletonNode( container, tagname, classname, innerHTML ) {
  394. var node = container.querySelector( '.' + classname );
  395. if( !node ) {
  396. node = document.createElement( tagname );
  397. node.classList.add( classname );
  398. if( innerHTML !== null ) {
  399. node.innerHTML = innerHTML;
  400. }
  401. container.appendChild( node );
  402. }
  403. return node;
  404. }
  405. /**
  406. * Creates the slide background elements and appends them
  407. * to the background container. One element is created per
  408. * slide no matter if the given slide has visible background.
  409. */
  410. function createBackgrounds() {
  411. var printMode = isPrintingPDF();
  412. // Clear prior backgrounds
  413. dom.background.innerHTML = '';
  414. dom.background.classList.add( 'no-transition' );
  415. // Iterate over all horizontal slides
  416. toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  417. var backgroundStack;
  418. if( printMode ) {
  419. backgroundStack = createBackground( slideh, slideh );
  420. }
  421. else {
  422. backgroundStack = createBackground( slideh, dom.background );
  423. }
  424. // Iterate over all vertical slides
  425. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  426. if( printMode ) {
  427. createBackground( slidev, slidev );
  428. }
  429. else {
  430. createBackground( slidev, backgroundStack );
  431. }
  432. backgroundStack.classList.add( 'stack' );
  433. } );
  434. } );
  435. // Add parallax background if specified
  436. if( config.parallaxBackgroundImage ) {
  437. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  438. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  439. // Make sure the below properties are set on the element - these properties are
  440. // needed for proper transitions to be set on the element via CSS. To remove
  441. // annoying background slide-in effect when the presentation starts, apply
  442. // these properties after short time delay
  443. setTimeout( function() {
  444. dom.wrapper.classList.add( 'has-parallax-background' );
  445. }, 1 );
  446. }
  447. else {
  448. dom.background.style.backgroundImage = '';
  449. dom.wrapper.classList.remove( 'has-parallax-background' );
  450. }
  451. }
  452. /**
  453. * Creates a background for the given slide.
  454. *
  455. * @param {HTMLElement} slide
  456. * @param {HTMLElement} container The element that the background
  457. * should be appended to
  458. */
  459. function createBackground( slide, container ) {
  460. var data = {
  461. background: slide.getAttribute( 'data-background' ),
  462. backgroundSize: slide.getAttribute( 'data-background-size' ),
  463. backgroundImage: slide.getAttribute( 'data-background-image' ),
  464. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  465. backgroundColor: slide.getAttribute( 'data-background-color' ),
  466. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  467. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  468. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  469. };
  470. var element = document.createElement( 'div' );
  471. // Carry over custom classes from the slide to the background
  472. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  473. if( data.background ) {
  474. // Auto-wrap image urls in url(...)
  475. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
  476. slide.setAttribute( 'data-background-image', data.background );
  477. }
  478. else {
  479. element.style.background = data.background;
  480. }
  481. }
  482. // Create a hash for this combination of background settings.
  483. // This is used to determine when two slide backgrounds are
  484. // the same.
  485. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo ) {
  486. element.setAttribute( 'data-background-hash', data.background +
  487. data.backgroundSize +
  488. data.backgroundImage +
  489. data.backgroundVideo +
  490. data.backgroundColor +
  491. data.backgroundRepeat +
  492. data.backgroundPosition +
  493. data.backgroundTransition );
  494. }
  495. // Additional and optional background properties
  496. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  497. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  498. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  499. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  500. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  501. container.appendChild( element );
  502. return element;
  503. }
  504. /**
  505. * Registers a listener to postMessage events, this makes it
  506. * possible to call all reveal.js API methods from another
  507. * window. For example:
  508. *
  509. * revealWindow.postMessage( JSON.stringify({
  510. * method: 'slide',
  511. * args: [ 2 ]
  512. * }), '*' );
  513. */
  514. function setupPostMessage() {
  515. if( config.postMessage ) {
  516. window.addEventListener( 'message', function ( event ) {
  517. var data = event.data;
  518. // Make sure we're dealing with JSON
  519. if( data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  520. data = JSON.parse( data );
  521. // Check if the requested method can be found
  522. if( data.method && typeof Reveal[data.method] === 'function' ) {
  523. Reveal[data.method].apply( Reveal, data.args );
  524. }
  525. }
  526. }, false );
  527. }
  528. }
  529. /**
  530. * Applies the configuration settings from the config
  531. * object. May be called multiple times.
  532. */
  533. function configure( options ) {
  534. var numberOfSlides = document.querySelectorAll( SLIDES_SELECTOR ).length;
  535. dom.wrapper.classList.remove( config.transition );
  536. // New config options may be passed when this method
  537. // is invoked through the API after initialization
  538. if( typeof options === 'object' ) extend( config, options );
  539. // Force linear transition based on browser capabilities
  540. if( features.transforms3d === false ) config.transition = 'linear';
  541. dom.wrapper.classList.add( config.transition );
  542. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  543. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  544. dom.controls.style.display = config.controls ? 'block' : 'none';
  545. dom.progress.style.display = config.progress ? 'block' : 'none';
  546. if( config.rtl ) {
  547. dom.wrapper.classList.add( 'rtl' );
  548. }
  549. else {
  550. dom.wrapper.classList.remove( 'rtl' );
  551. }
  552. if( config.center ) {
  553. dom.wrapper.classList.add( 'center' );
  554. }
  555. else {
  556. dom.wrapper.classList.remove( 'center' );
  557. }
  558. if( config.mouseWheel ) {
  559. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  560. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  561. }
  562. else {
  563. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  564. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  565. }
  566. // Rolling 3D links
  567. if( config.rollingLinks ) {
  568. enableRollingLinks();
  569. }
  570. else {
  571. disableRollingLinks();
  572. }
  573. // Iframe link previews
  574. if( config.previewLinks ) {
  575. enablePreviewLinks();
  576. }
  577. else {
  578. disablePreviewLinks();
  579. enablePreviewLinks( '[data-preview-link]' );
  580. }
  581. // Remove existing auto-slide controls
  582. if( autoSlidePlayer ) {
  583. autoSlidePlayer.destroy();
  584. autoSlidePlayer = null;
  585. }
  586. // Generate auto-slide controls if needed
  587. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  588. autoSlidePlayer = new Playback( dom.wrapper, function() {
  589. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  590. } );
  591. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  592. autoSlidePaused = false;
  593. }
  594. // When fragments are turned off they should be visible
  595. if( config.fragments === false ) {
  596. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  597. element.classList.add( 'visible' );
  598. element.classList.remove( 'current-fragment' );
  599. } );
  600. }
  601. // Load the theme in the config, if it's not already loaded
  602. if( config.theme && dom.theme ) {
  603. var themeURL = dom.theme.getAttribute( 'href' );
  604. var themeFinder = /[^\/]*?(?=\.css)/;
  605. var themeName = themeURL.match(themeFinder)[0];
  606. if( config.theme !== themeName ) {
  607. themeURL = themeURL.replace(themeFinder, config.theme);
  608. dom.theme.setAttribute( 'href', themeURL );
  609. }
  610. }
  611. sync();
  612. }
  613. /**
  614. * Binds all event listeners.
  615. */
  616. function addEventListeners() {
  617. eventsAreBound = true;
  618. window.addEventListener( 'hashchange', onWindowHashChange, false );
  619. window.addEventListener( 'resize', onWindowResize, false );
  620. if( config.touch ) {
  621. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  622. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  623. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  624. // Support pointer-style touch interaction as well
  625. if( window.navigator.pointerEnabled ) {
  626. // IE 11 uses un-prefixed version of pointer events
  627. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  628. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  629. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  630. }
  631. else if( window.navigator.msPointerEnabled ) {
  632. // IE 10 uses prefixed version of pointer events
  633. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  634. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  635. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  636. }
  637. }
  638. if( config.keyboard ) {
  639. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  640. }
  641. if( config.progress && dom.progress ) {
  642. dom.progress.addEventListener( 'click', onProgressClicked, false );
  643. }
  644. if( config.focusBodyOnPageVisiblityChange ) {
  645. var visibilityChange;
  646. if( 'hidden' in document ) {
  647. visibilityChange = 'visibilitychange';
  648. }
  649. else if( 'msHidden' in document ) {
  650. visibilityChange = 'msvisibilitychange';
  651. }
  652. else if( 'webkitHidden' in document ) {
  653. visibilityChange = 'webkitvisibilitychange';
  654. }
  655. if( visibilityChange ) {
  656. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  657. }
  658. }
  659. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  660. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  661. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  662. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  663. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  664. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  665. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  666. } );
  667. }
  668. /**
  669. * Unbinds all event listeners.
  670. */
  671. function removeEventListeners() {
  672. eventsAreBound = false;
  673. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  674. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  675. window.removeEventListener( 'resize', onWindowResize, false );
  676. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  677. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  678. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  679. // IE11
  680. if( window.navigator.pointerEnabled ) {
  681. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  682. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  683. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  684. }
  685. // IE10
  686. else if( window.navigator.msPointerEnabled ) {
  687. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  688. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  689. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  690. }
  691. if ( config.progress && dom.progress ) {
  692. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  693. }
  694. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  695. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  696. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  697. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  698. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  699. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  700. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  701. } );
  702. }
  703. /**
  704. * Extend object a with the properties of object b.
  705. * If there's a conflict, object b takes precedence.
  706. */
  707. function extend( a, b ) {
  708. for( var i in b ) {
  709. a[ i ] = b[ i ];
  710. }
  711. }
  712. /**
  713. * Converts the target object to an array.
  714. */
  715. function toArray( o ) {
  716. return Array.prototype.slice.call( o );
  717. }
  718. /**
  719. * Utility for deserializing a value.
  720. */
  721. function deserialize( value ) {
  722. if( typeof value === 'string' ) {
  723. if( value === 'null' ) return null;
  724. else if( value === 'true' ) return true;
  725. else if( value === 'false' ) return false;
  726. else if( value.match( /^\d+$/ ) ) return parseFloat( value );
  727. }
  728. return value;
  729. }
  730. /**
  731. * Measures the distance in pixels between point a
  732. * and point b.
  733. *
  734. * @param {Object} a point with x/y properties
  735. * @param {Object} b point with x/y properties
  736. */
  737. function distanceBetween( a, b ) {
  738. var dx = a.x - b.x,
  739. dy = a.y - b.y;
  740. return Math.sqrt( dx*dx + dy*dy );
  741. }
  742. /**
  743. * Applies a CSS transform to the target element.
  744. */
  745. function transformElement( element, transform ) {
  746. element.style.WebkitTransform = transform;
  747. element.style.MozTransform = transform;
  748. element.style.msTransform = transform;
  749. element.style.OTransform = transform;
  750. element.style.transform = transform;
  751. }
  752. /**
  753. * Injects the given CSS styles into the DOM.
  754. */
  755. function injectStyleSheet( value ) {
  756. var tag = document.createElement( 'style' );
  757. tag.type = 'text/css';
  758. if( tag.styleSheet ) {
  759. tag.styleSheet.cssText = value;
  760. }
  761. else {
  762. tag.appendChild( document.createTextNode( value ) );
  763. }
  764. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  765. }
  766. /**
  767. * Retrieves the height of the given element by looking
  768. * at the position and height of its immediate children.
  769. */
  770. function getAbsoluteHeight( element ) {
  771. var height = 0;
  772. if( element ) {
  773. var absoluteChildren = 0;
  774. toArray( element.childNodes ).forEach( function( child ) {
  775. if( typeof child.offsetTop === 'number' && child.style ) {
  776. // Count # of abs children
  777. if( window.getComputedStyle( child ).position === 'absolute' ) {
  778. absoluteChildren += 1;
  779. }
  780. height = Math.max( height, child.offsetTop + child.offsetHeight );
  781. }
  782. } );
  783. // If there are no absolute children, use offsetHeight
  784. if( absoluteChildren === 0 ) {
  785. height = element.offsetHeight;
  786. }
  787. }
  788. return height;
  789. }
  790. /**
  791. * Returns the remaining height within the parent of the
  792. * target element.
  793. *
  794. * remaining height = [ configured parent height ] - [ current parent height ]
  795. */
  796. function getRemainingHeight( element, height ) {
  797. height = height || 0;
  798. if( element ) {
  799. var newHeight, oldHeight = element.style.height;
  800. // Change the .stretch element height to 0 in order find the height of all
  801. // the other elements
  802. element.style.height = '0px';
  803. newHeight = height - element.parentNode.offsetHeight;
  804. // Restore the old height, just in case
  805. element.style.height = oldHeight + 'px';
  806. return newHeight;
  807. }
  808. return height;
  809. }
  810. /**
  811. * Checks if this instance is being used to print a PDF.
  812. */
  813. function isPrintingPDF() {
  814. return ( /print-pdf/gi ).test( window.location.search );
  815. }
  816. /**
  817. * Hides the address bar if we're on a mobile device.
  818. */
  819. function hideAddressBar() {
  820. if( config.hideAddressBar && isMobileDevice ) {
  821. // Events that should trigger the address bar to hide
  822. window.addEventListener( 'load', removeAddressBar, false );
  823. window.addEventListener( 'orientationchange', removeAddressBar, false );
  824. }
  825. }
  826. /**
  827. * Causes the address bar to hide on mobile devices,
  828. * more vertical space ftw.
  829. */
  830. function removeAddressBar() {
  831. setTimeout( function() {
  832. window.scrollTo( 0, 1 );
  833. }, 10 );
  834. }
  835. /**
  836. * Dispatches an event of the specified type from the
  837. * reveal DOM element.
  838. */
  839. function dispatchEvent( type, args ) {
  840. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  841. event.initEvent( type, true, true );
  842. extend( event, args );
  843. dom.wrapper.dispatchEvent( event );
  844. // If we're in an iframe, post each reveal.js event to the
  845. // parent window. Used by the notes plugin
  846. if( config.postMessageEvents && window.parent !== window.self ) {
  847. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  848. }
  849. }
  850. /**
  851. * Wrap all links in 3D goodness.
  852. */
  853. function enableRollingLinks() {
  854. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  855. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a' );
  856. for( var i = 0, len = anchors.length; i < len; i++ ) {
  857. var anchor = anchors[i];
  858. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  859. var span = document.createElement('span');
  860. span.setAttribute('data-title', anchor.text);
  861. span.innerHTML = anchor.innerHTML;
  862. anchor.classList.add( 'roll' );
  863. anchor.innerHTML = '';
  864. anchor.appendChild(span);
  865. }
  866. }
  867. }
  868. }
  869. /**
  870. * Unwrap all 3D links.
  871. */
  872. function disableRollingLinks() {
  873. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  874. for( var i = 0, len = anchors.length; i < len; i++ ) {
  875. var anchor = anchors[i];
  876. var span = anchor.querySelector( 'span' );
  877. if( span ) {
  878. anchor.classList.remove( 'roll' );
  879. anchor.innerHTML = span.innerHTML;
  880. }
  881. }
  882. }
  883. /**
  884. * Bind preview frame links.
  885. */
  886. function enablePreviewLinks( selector ) {
  887. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  888. anchors.forEach( function( element ) {
  889. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  890. element.addEventListener( 'click', onPreviewLinkClicked, false );
  891. }
  892. } );
  893. }
  894. /**
  895. * Unbind preview frame links.
  896. */
  897. function disablePreviewLinks() {
  898. var anchors = toArray( document.querySelectorAll( 'a' ) );
  899. anchors.forEach( function( element ) {
  900. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  901. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  902. }
  903. } );
  904. }
  905. /**
  906. * Opens a preview window for the target URL.
  907. */
  908. function openPreview( url ) {
  909. closePreview();
  910. dom.preview = document.createElement( 'div' );
  911. dom.preview.classList.add( 'preview-link-overlay' );
  912. dom.wrapper.appendChild( dom.preview );
  913. dom.preview.innerHTML = [
  914. '<header>',
  915. '<a class="close" href="#"><span class="icon"></span></a>',
  916. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  917. '</header>',
  918. '<div class="spinner"></div>',
  919. '<div class="viewport">',
  920. '<iframe src="'+ url +'"></iframe>',
  921. '</div>'
  922. ].join('');
  923. dom.preview.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  924. dom.preview.classList.add( 'loaded' );
  925. }, false );
  926. dom.preview.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  927. closePreview();
  928. event.preventDefault();
  929. }, false );
  930. dom.preview.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  931. closePreview();
  932. }, false );
  933. setTimeout( function() {
  934. dom.preview.classList.add( 'visible' );
  935. }, 1 );
  936. }
  937. /**
  938. * Closes the iframe preview window.
  939. */
  940. function closePreview() {
  941. if( dom.preview ) {
  942. dom.preview.setAttribute( 'src', '' );
  943. dom.preview.parentNode.removeChild( dom.preview );
  944. dom.preview = null;
  945. }
  946. }
  947. /**
  948. * Applies JavaScript-controlled layout rules to the
  949. * presentation.
  950. */
  951. function layout() {
  952. if( dom.wrapper && !isPrintingPDF() ) {
  953. var size = getComputedSlideSize();
  954. var slidePadding = 20; // TODO Dig this out of DOM
  955. // Layout the contents of the slides
  956. layoutSlideContents( config.width, config.height, slidePadding );
  957. dom.slides.style.width = size.width + 'px';
  958. dom.slides.style.height = size.height + 'px';
  959. // Determine scale of content to fit within available space
  960. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  961. // Respect max/min scale settings
  962. scale = Math.max( scale, config.minScale );
  963. scale = Math.min( scale, config.maxScale );
  964. // Prefer zooming in desktop WebKit so that content remains crisp
  965. if( !isMobileDevice && /webkit/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) {
  966. dom.slides.style.zoom = scale;
  967. }
  968. // Apply scale transform as a fallback
  969. else {
  970. dom.slides.style.left = '50%';
  971. dom.slides.style.top = '50%';
  972. dom.slides.style.bottom = 'auto';
  973. dom.slides.style.right = 'auto';
  974. transformElement( dom.slides, 'translate(-50%, -50%) scale('+ scale +')' );
  975. }
  976. // Select all slides, vertical and horizontal
  977. var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
  978. for( var i = 0, len = slides.length; i < len; i++ ) {
  979. var slide = slides[ i ];
  980. // Don't bother updating invisible slides
  981. if( slide.style.display === 'none' ) {
  982. continue;
  983. }
  984. if( config.center || slide.classList.contains( 'center' ) ) {
  985. // Vertical stacks are not centred since their section
  986. // children will be
  987. if( slide.classList.contains( 'stack' ) ) {
  988. slide.style.top = 0;
  989. }
  990. else {
  991. slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
  992. }
  993. }
  994. else {
  995. slide.style.top = '';
  996. }
  997. }
  998. updateProgress();
  999. updateParallax();
  1000. }
  1001. }
  1002. /**
  1003. * Applies layout logic to the contents of all slides in
  1004. * the presentation.
  1005. */
  1006. function layoutSlideContents( width, height, padding ) {
  1007. // Handle sizing of elements with the 'stretch' class
  1008. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1009. // Determine how much vertical space we can use
  1010. var remainingHeight = getRemainingHeight( element, height );
  1011. // Consider the aspect ratio of media elements
  1012. if( /(img|video)/gi.test( element.nodeName ) ) {
  1013. var nw = element.naturalWidth || element.videoWidth,
  1014. nh = element.naturalHeight || element.videoHeight;
  1015. var es = Math.min( width / nw, remainingHeight / nh );
  1016. element.style.width = ( nw * es ) + 'px';
  1017. element.style.height = ( nh * es ) + 'px';
  1018. }
  1019. else {
  1020. element.style.width = width + 'px';
  1021. element.style.height = remainingHeight + 'px';
  1022. }
  1023. } );
  1024. }
  1025. /**
  1026. * Calculates the computed pixel size of our slides. These
  1027. * values are based on the width and height configuration
  1028. * options.
  1029. */
  1030. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1031. var size = {
  1032. // Slide size
  1033. width: config.width,
  1034. height: config.height,
  1035. // Presentation size
  1036. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1037. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1038. };
  1039. // Reduce available space by margin
  1040. size.presentationWidth -= ( size.presentationHeight * config.margin );
  1041. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1042. // Slide width may be a percentage of available width
  1043. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1044. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1045. }
  1046. // Slide height may be a percentage of available height
  1047. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1048. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1049. }
  1050. return size;
  1051. }
  1052. /**
  1053. * Stores the vertical index of a stack so that the same
  1054. * vertical slide can be selected when navigating to and
  1055. * from the stack.
  1056. *
  1057. * @param {HTMLElement} stack The vertical stack element
  1058. * @param {int} v Index to memorize
  1059. */
  1060. function setPreviousVerticalIndex( stack, v ) {
  1061. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1062. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1063. }
  1064. }
  1065. /**
  1066. * Retrieves the vertical index which was stored using
  1067. * #setPreviousVerticalIndex() or 0 if no previous index
  1068. * exists.
  1069. *
  1070. * @param {HTMLElement} stack The vertical stack element
  1071. */
  1072. function getPreviousVerticalIndex( stack ) {
  1073. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1074. // Prefer manually defined start-indexv
  1075. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1076. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1077. }
  1078. return 0;
  1079. }
  1080. /**
  1081. * Displays the overview of slides (quick nav) by
  1082. * scaling down and arranging all slide elements.
  1083. *
  1084. * Experimental feature, might be dropped if perf
  1085. * can't be improved.
  1086. */
  1087. function activateOverview() {
  1088. // Only proceed if enabled in config
  1089. if( config.overview ) {
  1090. // Don't auto-slide while in overview mode
  1091. cancelAutoSlide();
  1092. var wasActive = dom.wrapper.classList.contains( 'overview' );
  1093. // Vary the depth of the overview based on screen size
  1094. var depth = window.innerWidth < 400 ? 1000 : 2500;
  1095. dom.wrapper.classList.add( 'overview' );
  1096. dom.wrapper.classList.remove( 'overview-deactivating' );
  1097. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1098. for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
  1099. var hslide = horizontalSlides[i],
  1100. hoffset = config.rtl ? -105 : 105;
  1101. hslide.setAttribute( 'data-index-h', i );
  1102. // Apply CSS transform
  1103. transformElement( hslide, 'translateZ(-'+ depth +'px) translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)' );
  1104. if( hslide.classList.contains( 'stack' ) ) {
  1105. var verticalSlides = hslide.querySelectorAll( 'section' );
  1106. for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
  1107. var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );
  1108. var vslide = verticalSlides[j];
  1109. vslide.setAttribute( 'data-index-h', i );
  1110. vslide.setAttribute( 'data-index-v', j );
  1111. // Apply CSS transform
  1112. transformElement( vslide, 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)' );
  1113. // Navigate to this slide on click
  1114. vslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1115. }
  1116. }
  1117. else {
  1118. // Navigate to this slide on click
  1119. hslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1120. }
  1121. }
  1122. updateSlidesVisibility();
  1123. layout();
  1124. if( !wasActive ) {
  1125. // Notify observers of the overview showing
  1126. dispatchEvent( 'overviewshown', {
  1127. 'indexh': indexh,
  1128. 'indexv': indexv,
  1129. 'currentSlide': currentSlide
  1130. } );
  1131. }
  1132. }
  1133. }
  1134. /**
  1135. * Exits the slide overview and enters the currently
  1136. * active slide.
  1137. */
  1138. function deactivateOverview() {
  1139. // Only proceed if enabled in config
  1140. if( config.overview ) {
  1141. dom.wrapper.classList.remove( 'overview' );
  1142. // Temporarily add a class so that transitions can do different things
  1143. // depending on whether they are exiting/entering overview, or just
  1144. // moving from slide to slide
  1145. dom.wrapper.classList.add( 'overview-deactivating' );
  1146. setTimeout( function () {
  1147. dom.wrapper.classList.remove( 'overview-deactivating' );
  1148. }, 1 );
  1149. // Select all slides
  1150. toArray( document.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1151. // Resets all transforms to use the external styles
  1152. transformElement( slide, '' );
  1153. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1154. } );
  1155. slide( indexh, indexv );
  1156. cueAutoSlide();
  1157. // Notify observers of the overview hiding
  1158. dispatchEvent( 'overviewhidden', {
  1159. 'indexh': indexh,
  1160. 'indexv': indexv,
  1161. 'currentSlide': currentSlide
  1162. } );
  1163. }
  1164. }
  1165. /**
  1166. * Toggles the slide overview mode on and off.
  1167. *
  1168. * @param {Boolean} override Optional flag which overrides the
  1169. * toggle logic and forcibly sets the desired state. True means
  1170. * overview is open, false means it's closed.
  1171. */
  1172. function toggleOverview( override ) {
  1173. if( typeof override === 'boolean' ) {
  1174. override ? activateOverview() : deactivateOverview();
  1175. }
  1176. else {
  1177. isOverview() ? deactivateOverview() : activateOverview();
  1178. }
  1179. }
  1180. /**
  1181. * Checks if the overview is currently active.
  1182. *
  1183. * @return {Boolean} true if the overview is active,
  1184. * false otherwise
  1185. */
  1186. function isOverview() {
  1187. return dom.wrapper.classList.contains( 'overview' );
  1188. }
  1189. /**
  1190. * Checks if the current or specified slide is vertical
  1191. * (nested within another slide).
  1192. *
  1193. * @param {HTMLElement} slide [optional] The slide to check
  1194. * orientation of
  1195. */
  1196. function isVerticalSlide( slide ) {
  1197. // Prefer slide argument, otherwise use current slide
  1198. slide = slide ? slide : currentSlide;
  1199. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1200. }
  1201. /**
  1202. * Handling the fullscreen functionality via the fullscreen API
  1203. *
  1204. * @see http://fullscreen.spec.whatwg.org/
  1205. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1206. */
  1207. function enterFullscreen() {
  1208. var element = document.body;
  1209. // Check which implementation is available
  1210. var requestMethod = element.requestFullScreen ||
  1211. element.webkitRequestFullscreen ||
  1212. element.webkitRequestFullScreen ||
  1213. element.mozRequestFullScreen ||
  1214. element.msRequestFullscreen;
  1215. if( requestMethod ) {
  1216. requestMethod.apply( element );
  1217. }
  1218. }
  1219. /**
  1220. * Enters the paused mode which fades everything on screen to
  1221. * black.
  1222. */
  1223. function pause() {
  1224. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1225. cancelAutoSlide();
  1226. dom.wrapper.classList.add( 'paused' );
  1227. if( wasPaused === false ) {
  1228. dispatchEvent( 'paused' );
  1229. }
  1230. }
  1231. /**
  1232. * Exits from the paused mode.
  1233. */
  1234. function resume() {
  1235. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1236. dom.wrapper.classList.remove( 'paused' );
  1237. cueAutoSlide();
  1238. if( wasPaused ) {
  1239. dispatchEvent( 'resumed' );
  1240. }
  1241. }
  1242. /**
  1243. * Toggles the paused mode on and off.
  1244. */
  1245. function togglePause( override ) {
  1246. if( typeof override === 'boolean' ) {
  1247. override ? pause() : resume();
  1248. }
  1249. else {
  1250. isPaused() ? resume() : pause();
  1251. }
  1252. }
  1253. /**
  1254. * Checks if we are currently in the paused mode.
  1255. */
  1256. function isPaused() {
  1257. return dom.wrapper.classList.contains( 'paused' );
  1258. }
  1259. /**
  1260. * Toggles the auto slide mode on and off.
  1261. *
  1262. * @param {Boolean} override Optional flag which sets the desired state.
  1263. * True means autoplay starts, false means it stops.
  1264. */
  1265. function toggleAutoSlide( override ) {
  1266. if( typeof override === 'boolean' ) {
  1267. override ? resumeAutoSlide() : pauseAutoSlide();
  1268. }
  1269. else {
  1270. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  1271. }
  1272. }
  1273. /**
  1274. * Checks if the auto slide mode is currently on.
  1275. */
  1276. function isAutoSliding() {
  1277. return !!( autoSlide && !autoSlidePaused );
  1278. }
  1279. /**
  1280. * Steps from the current point in the presentation to the
  1281. * slide which matches the specified horizontal and vertical
  1282. * indices.
  1283. *
  1284. * @param {int} h Horizontal index of the target slide
  1285. * @param {int} v Vertical index of the target slide
  1286. * @param {int} f Optional index of a fragment within the
  1287. * target slide to activate
  1288. * @param {int} o Optional origin for use in multimaster environments
  1289. */
  1290. function slide( h, v, f, o ) {
  1291. // Remember where we were at before
  1292. previousSlide = currentSlide;
  1293. // Query all horizontal slides in the deck
  1294. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1295. // If no vertical index is specified and the upcoming slide is a
  1296. // stack, resume at its previous vertical index
  1297. if( v === undefined ) {
  1298. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1299. }
  1300. // If we were on a vertical stack, remember what vertical index
  1301. // it was on so we can resume at the same position when returning
  1302. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1303. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1304. }
  1305. // Remember the state before this slide
  1306. var stateBefore = state.concat();
  1307. // Reset the state array
  1308. state.length = 0;
  1309. var indexhBefore = indexh || 0,
  1310. indexvBefore = indexv || 0;
  1311. // Activate and transition to the new slide
  1312. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1313. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1314. // Update the visibility of slides now that the indices have changed
  1315. updateSlidesVisibility();
  1316. layout();
  1317. // Apply the new state
  1318. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1319. // Check if this state existed on the previous slide. If it
  1320. // did, we will avoid adding it repeatedly
  1321. for( var j = 0; j < stateBefore.length; j++ ) {
  1322. if( stateBefore[j] === state[i] ) {
  1323. stateBefore.splice( j, 1 );
  1324. continue stateLoop;
  1325. }
  1326. }
  1327. document.documentElement.classList.add( state[i] );
  1328. // Dispatch custom event matching the state's name
  1329. dispatchEvent( state[i] );
  1330. }
  1331. // Clean up the remains of the previous state
  1332. while( stateBefore.length ) {
  1333. document.documentElement.classList.remove( stateBefore.pop() );
  1334. }
  1335. // If the overview is active, re-activate it to update positions
  1336. if( isOverview() ) {
  1337. activateOverview();
  1338. }
  1339. // Find the current horizontal slide and any possible vertical slides
  1340. // within it
  1341. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1342. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1343. // Store references to the previous and current slides
  1344. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1345. // Show fragment, if specified
  1346. if( typeof f !== 'undefined' ) {
  1347. navigateFragment( f );
  1348. }
  1349. // Dispatch an event if the slide changed
  1350. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1351. if( slideChanged ) {
  1352. dispatchEvent( 'slidechanged', {
  1353. 'indexh': indexh,
  1354. 'indexv': indexv,
  1355. 'previousSlide': previousSlide,
  1356. 'currentSlide': currentSlide,
  1357. 'origin': o
  1358. } );
  1359. }
  1360. else {
  1361. // Ensure that the previous slide is never the same as the current
  1362. previousSlide = null;
  1363. }
  1364. // Solves an edge case where the previous slide maintains the
  1365. // 'present' class when navigating between adjacent vertical
  1366. // stacks
  1367. if( previousSlide ) {
  1368. previousSlide.classList.remove( 'present' );
  1369. // Reset all slides upon navigate to home
  1370. // Issue: #285
  1371. if ( document.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1372. // Launch async task
  1373. setTimeout( function () {
  1374. var slides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1375. for( i in slides ) {
  1376. if( slides[i] ) {
  1377. // Reset stack
  1378. setPreviousVerticalIndex( slides[i], 0 );
  1379. }
  1380. }
  1381. }, 0 );
  1382. }
  1383. }
  1384. // Handle embedded content
  1385. if( slideChanged ) {
  1386. stopEmbeddedContent( previousSlide );
  1387. startEmbeddedContent( currentSlide );
  1388. }
  1389. updateControls();
  1390. updateProgress();
  1391. updateBackground();
  1392. updateParallax();
  1393. updateSlideNumber();
  1394. // Update the URL hash
  1395. writeURL();
  1396. cueAutoSlide();
  1397. }
  1398. /**
  1399. * Syncs the presentation with the current DOM. Useful
  1400. * when new slides or control elements are added or when
  1401. * the configuration has changed.
  1402. */
  1403. function sync() {
  1404. // Subscribe to input
  1405. removeEventListeners();
  1406. addEventListeners();
  1407. // Force a layout to make sure the current config is accounted for
  1408. layout();
  1409. // Reflect the current autoSlide value
  1410. autoSlide = config.autoSlide;
  1411. // Start auto-sliding if it's enabled
  1412. cueAutoSlide();
  1413. // Re-create the slide backgrounds
  1414. createBackgrounds();
  1415. sortAllFragments();
  1416. updateControls();
  1417. updateProgress();
  1418. updateBackground( true );
  1419. updateSlideNumber();
  1420. updateSlidesVisibility();
  1421. }
  1422. /**
  1423. * Resets all vertical slides so that only the first
  1424. * is visible.
  1425. */
  1426. function resetVerticalSlides() {
  1427. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1428. horizontalSlides.forEach( function( horizontalSlide ) {
  1429. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1430. verticalSlides.forEach( function( verticalSlide, y ) {
  1431. if( y > 0 ) {
  1432. verticalSlide.classList.remove( 'present' );
  1433. verticalSlide.classList.remove( 'past' );
  1434. verticalSlide.classList.add( 'future' );
  1435. }
  1436. } );
  1437. } );
  1438. }
  1439. /**
  1440. * Sorts and formats all of fragments in the
  1441. * presentation.
  1442. */
  1443. function sortAllFragments() {
  1444. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1445. horizontalSlides.forEach( function( horizontalSlide ) {
  1446. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1447. verticalSlides.forEach( function( verticalSlide, y ) {
  1448. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  1449. } );
  1450. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  1451. } );
  1452. }
  1453. /**
  1454. * Updates one dimension of slides by showing the slide
  1455. * with the specified index.
  1456. *
  1457. * @param {String} selector A CSS selector that will fetch
  1458. * the group of slides we are working with
  1459. * @param {Number} index The index of the slide that should be
  1460. * shown
  1461. *
  1462. * @return {Number} The index of the slide that is now shown,
  1463. * might differ from the passed in index if it was out of
  1464. * bounds.
  1465. */
  1466. function updateSlides( selector, index ) {
  1467. // Select all slides and convert the NodeList result to
  1468. // an array
  1469. var slides = toArray( document.querySelectorAll( selector ) ),
  1470. slidesLength = slides.length;
  1471. var printMode = isPrintingPDF();
  1472. if( slidesLength ) {
  1473. // Should the index loop?
  1474. if( config.loop ) {
  1475. index %= slidesLength;
  1476. if( index < 0 ) {
  1477. index = slidesLength + index;
  1478. }
  1479. }
  1480. // Enforce max and minimum index bounds
  1481. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1482. for( var i = 0; i < slidesLength; i++ ) {
  1483. var element = slides[i];
  1484. var reverse = config.rtl && !isVerticalSlide( element );
  1485. element.classList.remove( 'past' );
  1486. element.classList.remove( 'present' );
  1487. element.classList.remove( 'future' );
  1488. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1489. element.setAttribute( 'hidden', '' );
  1490. // If this element contains vertical slides
  1491. if( element.querySelector( 'section' ) ) {
  1492. element.classList.add( 'stack' );
  1493. }
  1494. // If we're printing static slides, all slides are "present"
  1495. if( printMode ) {
  1496. element.classList.add( 'present' );
  1497. continue;
  1498. }
  1499. if( i < index ) {
  1500. // Any element previous to index is given the 'past' class
  1501. element.classList.add( reverse ? 'future' : 'past' );
  1502. if( config.fragments ) {
  1503. var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
  1504. // Show all fragments on prior slides
  1505. while( pastFragments.length ) {
  1506. var pastFragment = pastFragments.pop();
  1507. pastFragment.classList.add( 'visible' );
  1508. pastFragment.classList.remove( 'current-fragment' );
  1509. }
  1510. }
  1511. }
  1512. else if( i > index ) {
  1513. // Any element subsequent to index is given the 'future' class
  1514. element.classList.add( reverse ? 'past' : 'future' );
  1515. if( config.fragments ) {
  1516. var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1517. // No fragments in future slides should be visible ahead of time
  1518. while( futureFragments.length ) {
  1519. var futureFragment = futureFragments.pop();
  1520. futureFragment.classList.remove( 'visible' );
  1521. futureFragment.classList.remove( 'current-fragment' );
  1522. }
  1523. }
  1524. }
  1525. }
  1526. // Mark the current slide as present
  1527. slides[index].classList.add( 'present' );
  1528. slides[index].removeAttribute( 'hidden' );
  1529. // If this slide has a state associated with it, add it
  1530. // onto the current state of the deck
  1531. var slideState = slides[index].getAttribute( 'data-state' );
  1532. if( slideState ) {
  1533. state = state.concat( slideState.split( ' ' ) );
  1534. }
  1535. }
  1536. else {
  1537. // Since there are no slides we can't be anywhere beyond the
  1538. // zeroth index
  1539. index = 0;
  1540. }
  1541. return index;
  1542. }
  1543. /**
  1544. * Optimization method; hide all slides that are far away
  1545. * from the present slide.
  1546. */
  1547. function updateSlidesVisibility() {
  1548. // Select all slides and convert the NodeList result to
  1549. // an array
  1550. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1551. horizontalSlidesLength = horizontalSlides.length,
  1552. distanceX,
  1553. distanceY;
  1554. if( horizontalSlidesLength ) {
  1555. // The number of steps away from the present slide that will
  1556. // be visible
  1557. var viewDistance = isOverview() ? 10 : config.viewDistance;
  1558. // Limit view distance on weaker devices
  1559. if( isMobileDevice ) {
  1560. viewDistance = isOverview() ? 6 : 2;
  1561. }
  1562. // Limit view distance on weaker devices
  1563. if( isPrintingPDF() ) {
  1564. viewDistance = Number.MAX_VALUE;
  1565. }
  1566. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1567. var horizontalSlide = horizontalSlides[x];
  1568. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1569. verticalSlidesLength = verticalSlides.length;
  1570. // Loops so that it measures 1 between the first and last slides
  1571. distanceX = Math.abs( ( indexh - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1572. // Show the horizontal slide if it's within the view distance
  1573. if( distanceX < viewDistance ) {
  1574. showSlide( horizontalSlide );
  1575. }
  1576. else {
  1577. hideSlide( horizontalSlide );
  1578. }
  1579. if( verticalSlidesLength ) {
  1580. var oy = getPreviousVerticalIndex( horizontalSlide );
  1581. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1582. var verticalSlide = verticalSlides[y];
  1583. distanceY = x === indexh ? Math.abs( indexv - y ) : Math.abs( y - oy );
  1584. if( distanceX + distanceY < viewDistance ) {
  1585. showSlide( verticalSlide );
  1586. }
  1587. else {
  1588. hideSlide( verticalSlide );
  1589. }
  1590. }
  1591. }
  1592. }
  1593. }
  1594. }
  1595. /**
  1596. * Updates the progress bar to reflect the current slide.
  1597. */
  1598. function updateProgress() {
  1599. // Update progress if enabled
  1600. if( config.progress && dom.progress ) {
  1601. dom.progressbar.style.width = getProgress() * window.innerWidth + 'px';
  1602. }
  1603. }
  1604. /**
  1605. * Updates the slide number div to reflect the current slide.
  1606. */
  1607. function updateSlideNumber() {
  1608. // Update slide number if enabled
  1609. if( config.slideNumber && dom.slideNumber) {
  1610. // Display the number of the page using 'indexh - indexv' format
  1611. var indexString = indexh;
  1612. if( indexv > 0 ) {
  1613. indexString += ' - ' + indexv;
  1614. }
  1615. dom.slideNumber.innerHTML = indexString;
  1616. }
  1617. }
  1618. /**
  1619. * Updates the state of all control/navigation arrows.
  1620. */
  1621. function updateControls() {
  1622. var routes = availableRoutes();
  1623. var fragments = availableFragments();
  1624. // Remove the 'enabled' class from all directions
  1625. dom.controlsLeft.concat( dom.controlsRight )
  1626. .concat( dom.controlsUp )
  1627. .concat( dom.controlsDown )
  1628. .concat( dom.controlsPrev )
  1629. .concat( dom.controlsNext ).forEach( function( node ) {
  1630. node.classList.remove( 'enabled' );
  1631. node.classList.remove( 'fragmented' );
  1632. } );
  1633. // Add the 'enabled' class to the available routes
  1634. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1635. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1636. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1637. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1638. // Prev/next buttons
  1639. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1640. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1641. // Highlight fragment directions
  1642. if( currentSlide ) {
  1643. // Always apply fragment decorator to prev/next buttons
  1644. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1645. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1646. // Apply fragment decorators to directional buttons based on
  1647. // what slide axis they are in
  1648. if( isVerticalSlide( currentSlide ) ) {
  1649. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1650. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1651. }
  1652. else {
  1653. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1654. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1655. }
  1656. }
  1657. }
  1658. /**
  1659. * Updates the background elements to reflect the current
  1660. * slide.
  1661. *
  1662. * @param {Boolean} includeAll If true, the backgrounds of
  1663. * all vertical slides (not just the present) will be updated.
  1664. */
  1665. function updateBackground( includeAll ) {
  1666. var currentBackground = null;
  1667. // Reverse past/future classes when in RTL mode
  1668. var horizontalPast = config.rtl ? 'future' : 'past',
  1669. horizontalFuture = config.rtl ? 'past' : 'future';
  1670. // Update the classes of all backgrounds to match the
  1671. // states of their slides (past/present/future)
  1672. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  1673. backgroundh.classList.remove( 'past' );
  1674. backgroundh.classList.remove( 'present' );
  1675. backgroundh.classList.remove( 'future' );
  1676. if( h < indexh ) {
  1677. backgroundh.classList.add( horizontalPast );
  1678. }
  1679. else if ( h > indexh ) {
  1680. backgroundh.classList.add( horizontalFuture );
  1681. }
  1682. else {
  1683. backgroundh.classList.add( 'present' );
  1684. // Store a reference to the current background element
  1685. currentBackground = backgroundh;
  1686. }
  1687. if( includeAll || h === indexh ) {
  1688. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  1689. backgroundv.classList.remove( 'past' );
  1690. backgroundv.classList.remove( 'present' );
  1691. backgroundv.classList.remove( 'future' );
  1692. if( v < indexv ) {
  1693. backgroundv.classList.add( 'past' );
  1694. }
  1695. else if ( v > indexv ) {
  1696. backgroundv.classList.add( 'future' );
  1697. }
  1698. else {
  1699. backgroundv.classList.add( 'present' );
  1700. // Only if this is the present horizontal and vertical slide
  1701. if( h === indexh ) currentBackground = backgroundv;
  1702. }
  1703. } );
  1704. }
  1705. } );
  1706. // Stop any currently playing video background
  1707. if( previousBackground ) {
  1708. var previousVideo = previousBackground.querySelector( 'video' );
  1709. if( previousVideo ) previousVideo.pause();
  1710. }
  1711. if( currentBackground ) {
  1712. // Start video playback
  1713. var currentVideo = currentBackground.querySelector( 'video' );
  1714. if( currentVideo ) currentVideo.play();
  1715. // Don't transition between identical backgrounds. This
  1716. // prevents unwanted flicker.
  1717. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  1718. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  1719. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  1720. dom.background.classList.add( 'no-transition' );
  1721. }
  1722. previousBackground = currentBackground;
  1723. }
  1724. // Allow the first background to apply without transition
  1725. setTimeout( function() {
  1726. dom.background.classList.remove( 'no-transition' );
  1727. }, 1 );
  1728. }
  1729. /**
  1730. * Updates the position of the parallax background based
  1731. * on the current slide index.
  1732. */
  1733. function updateParallax() {
  1734. if( config.parallaxBackgroundImage ) {
  1735. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1736. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1737. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  1738. backgroundWidth, backgroundHeight;
  1739. if( backgroundSize.length === 1 ) {
  1740. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  1741. }
  1742. else {
  1743. backgroundWidth = parseInt( backgroundSize[0], 10 );
  1744. backgroundHeight = parseInt( backgroundSize[1], 10 );
  1745. }
  1746. var slideWidth = dom.background.offsetWidth;
  1747. var horizontalSlideCount = horizontalSlides.length;
  1748. var horizontalOffset = -( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) * indexh;
  1749. var slideHeight = dom.background.offsetHeight;
  1750. var verticalSlideCount = verticalSlides.length;
  1751. var verticalOffset = verticalSlideCount > 1 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0;
  1752. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
  1753. }
  1754. }
  1755. /**
  1756. * Called when the given slide is within the configured view
  1757. * distance. Shows the slide element and loads any content
  1758. * that is set to load lazily (data-src).
  1759. */
  1760. function showSlide( slide ) {
  1761. // Show the slide element
  1762. slide.style.display = 'block';
  1763. // Media elements with data-src attributes
  1764. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  1765. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  1766. element.removeAttribute( 'data-src' );
  1767. } );
  1768. // Media elements with <source> children
  1769. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  1770. var sources = 0;
  1771. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  1772. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  1773. source.removeAttribute( 'data-src' );
  1774. sources += 1;
  1775. } );
  1776. // If we rewrote sources for this video/audio element, we need
  1777. // to manually tell it to load from its new origin
  1778. if( sources > 0 ) {
  1779. media.load();
  1780. }
  1781. } );
  1782. // Show the corresponding background element
  1783. var indices = getIndices( slide );
  1784. var background = getSlideBackground( indices.h, indices.v );
  1785. if( background ) {
  1786. background.style.display = 'block';
  1787. // If the background contains media, load it
  1788. if( background.hasAttribute( 'data-loaded' ) === false ) {
  1789. background.setAttribute( 'data-loaded', 'true' );
  1790. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  1791. backgroundVideo = slide.getAttribute( 'data-background-video' );
  1792. // Images
  1793. if( backgroundImage ) {
  1794. background.style.backgroundImage = 'url('+ backgroundImage +')';
  1795. }
  1796. // Videos
  1797. else if ( backgroundVideo ) {
  1798. var video = document.createElement( 'video' );
  1799. // Support comma separated lists of video sources
  1800. backgroundVideo.split( ',' ).forEach( function( source ) {
  1801. video.innerHTML += '<source src="'+ source +'">';
  1802. } );
  1803. background.appendChild( video );
  1804. }
  1805. }
  1806. }
  1807. }
  1808. /**
  1809. * Called when the given slide is moved outside of the
  1810. * configured view distance.
  1811. */
  1812. function hideSlide( slide ) {
  1813. // Hide the slide element
  1814. slide.style.display = 'none';
  1815. // Hide the corresponding background element
  1816. var indices = getIndices( slide );
  1817. var background = getSlideBackground( indices.h, indices.v );
  1818. if( background ) {
  1819. background.style.display = 'none';
  1820. }
  1821. }
  1822. /**
  1823. * Determine what available routes there are for navigation.
  1824. *
  1825. * @return {Object} containing four booleans: left/right/up/down
  1826. */
  1827. function availableRoutes() {
  1828. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1829. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1830. var routes = {
  1831. left: indexh > 0 || config.loop,
  1832. right: indexh < horizontalSlides.length - 1 || config.loop,
  1833. up: indexv > 0,
  1834. down: indexv < verticalSlides.length - 1
  1835. };
  1836. // reverse horizontal controls for rtl
  1837. if( config.rtl ) {
  1838. var left = routes.left;
  1839. routes.left = routes.right;
  1840. routes.right = left;
  1841. }
  1842. return routes;
  1843. }
  1844. /**
  1845. * Returns an object describing the available fragment
  1846. * directions.
  1847. *
  1848. * @return {Object} two boolean properties: prev/next
  1849. */
  1850. function availableFragments() {
  1851. if( currentSlide && config.fragments ) {
  1852. var fragments = currentSlide.querySelectorAll( '.fragment' );
  1853. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  1854. return {
  1855. prev: fragments.length - hiddenFragments.length > 0,
  1856. next: !!hiddenFragments.length
  1857. };
  1858. }
  1859. else {
  1860. return { prev: false, next: false };
  1861. }
  1862. }
  1863. /**
  1864. * Start playback of any embedded content inside of
  1865. * the targeted slide.
  1866. */
  1867. function startEmbeddedContent( slide ) {
  1868. if( slide && !isSpeakerNotes() ) {
  1869. // HTML5 media elements
  1870. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1871. if( el.hasAttribute( 'data-autoplay' ) ) {
  1872. el.play();
  1873. }
  1874. } );
  1875. // iframe embeds
  1876. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  1877. el.contentWindow.postMessage( 'slide:start', '*' );
  1878. });
  1879. // YouTube embeds
  1880. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1881. if( el.hasAttribute( 'data-autoplay' ) ) {
  1882. el.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  1883. }
  1884. });
  1885. }
  1886. }
  1887. /**
  1888. * Stop playback of any embedded content inside of
  1889. * the targeted slide.
  1890. */
  1891. function stopEmbeddedContent( slide ) {
  1892. if( slide ) {
  1893. // HTML5 media elements
  1894. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1895. if( !el.hasAttribute( 'data-ignore' ) ) {
  1896. el.pause();
  1897. }
  1898. } );
  1899. // iframe embeds
  1900. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  1901. el.contentWindow.postMessage( 'slide:stop', '*' );
  1902. });
  1903. // YouTube embeds
  1904. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1905. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  1906. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  1907. }
  1908. });
  1909. }
  1910. }
  1911. /**
  1912. * Returns a value ranging from 0-1 that represents
  1913. * how far into the presentation we have navigated.
  1914. */
  1915. function getProgress() {
  1916. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1917. // The number of past and total slides
  1918. var totalCount = document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  1919. var pastCount = 0;
  1920. // Step through all slides and count the past ones
  1921. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  1922. var horizontalSlide = horizontalSlides[i];
  1923. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1924. for( var j = 0; j < verticalSlides.length; j++ ) {
  1925. // Stop as soon as we arrive at the present
  1926. if( verticalSlides[j].classList.contains( 'present' ) ) {
  1927. break mainLoop;
  1928. }
  1929. pastCount++;
  1930. }
  1931. // Stop as soon as we arrive at the present
  1932. if( horizontalSlide.classList.contains( 'present' ) ) {
  1933. break;
  1934. }
  1935. // Don't count the wrapping section for vertical slides
  1936. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  1937. pastCount++;
  1938. }
  1939. }
  1940. if( currentSlide ) {
  1941. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  1942. // If there are fragments in the current slide those should be
  1943. // accounted for in the progress.
  1944. if( allFragments.length > 0 ) {
  1945. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  1946. // This value represents how big a portion of the slide progress
  1947. // that is made up by its fragments (0-1)
  1948. var fragmentWeight = 0.9;
  1949. // Add fragment progress to the past slide count
  1950. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  1951. }
  1952. }
  1953. return pastCount / ( totalCount - 1 );
  1954. }
  1955. /**
  1956. * Checks if this presentation is running inside of the
  1957. * speaker notes window.
  1958. */
  1959. function isSpeakerNotes() {
  1960. return !!window.location.search.match( /receiver/gi );
  1961. }
  1962. /**
  1963. * Reads the current URL (hash) and navigates accordingly.
  1964. */
  1965. function readURL() {
  1966. var hash = window.location.hash;
  1967. // Attempt to parse the hash as either an index or name
  1968. var bits = hash.slice( 2 ).split( '/' ),
  1969. name = hash.replace( /#|\//gi, '' );
  1970. // If the first bit is invalid and there is a name we can
  1971. // assume that this is a named link
  1972. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  1973. var element;
  1974. try {
  1975. // Find the slide with the specified name
  1976. element = document.querySelector( '#' + name );
  1977. }
  1978. catch( e ) {
  1979. // If the ID is an invalid selector a harmless SyntaxError
  1980. // may be thrown here.
  1981. }
  1982. if( element ) {
  1983. // Find the position of the named slide and navigate to it
  1984. var indices = Reveal.getIndices( element );
  1985. slide( indices.h, indices.v );
  1986. }
  1987. // If the slide doesn't exist, navigate to the current slide
  1988. else {
  1989. slide( indexh || 0, indexv || 0 );
  1990. }
  1991. }
  1992. else {
  1993. // Read the index components of the hash
  1994. var h = parseInt( bits[0], 10 ) || 0,
  1995. v = parseInt( bits[1], 10 ) || 0;
  1996. if( h !== indexh || v !== indexv ) {
  1997. slide( h, v );
  1998. }
  1999. }
  2000. }
  2001. /**
  2002. * Updates the page URL (hash) to reflect the current
  2003. * state.
  2004. *
  2005. * @param {Number} delay The time in ms to wait before
  2006. * writing the hash
  2007. */
  2008. function writeURL( delay ) {
  2009. if( config.history ) {
  2010. // Make sure there's never more than one timeout running
  2011. clearTimeout( writeURLTimeout );
  2012. // If a delay is specified, timeout this call
  2013. if( typeof delay === 'number' ) {
  2014. writeURLTimeout = setTimeout( writeURL, delay );
  2015. }
  2016. else {
  2017. var url = '/';
  2018. // Attempt to create a named link based on the slide's ID
  2019. var id = currentSlide.getAttribute( 'id' );
  2020. if( id ) {
  2021. id = id.toLowerCase();
  2022. id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
  2023. }
  2024. // If the current slide has an ID, use that as a named link
  2025. if( currentSlide && typeof id === 'string' && id.length ) {
  2026. url = '/' + id;
  2027. }
  2028. // Otherwise use the /h/v index
  2029. else {
  2030. if( indexh > 0 || indexv > 0 ) url += indexh;
  2031. if( indexv > 0 ) url += '/' + indexv;
  2032. }
  2033. window.location.hash = url;
  2034. }
  2035. }
  2036. }
  2037. /**
  2038. * Retrieves the h/v location of the current, or specified,
  2039. * slide.
  2040. *
  2041. * @param {HTMLElement} slide If specified, the returned
  2042. * index will be for this slide rather than the currently
  2043. * active one
  2044. *
  2045. * @return {Object} { h: <int>, v: <int>, f: <int> }
  2046. */
  2047. function getIndices( slide ) {
  2048. // By default, return the current indices
  2049. var h = indexh,
  2050. v = indexv,
  2051. f;
  2052. // If a slide is specified, return the indices of that slide
  2053. if( slide ) {
  2054. var isVertical = isVerticalSlide( slide );
  2055. var slideh = isVertical ? slide.parentNode : slide;
  2056. // Select all horizontal slides
  2057. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2058. // Now that we know which the horizontal slide is, get its index
  2059. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  2060. // Assume we're not vertical
  2061. v = undefined;
  2062. // If this is a vertical slide, grab the vertical index
  2063. if( isVertical ) {
  2064. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  2065. }
  2066. }
  2067. if( !slide && currentSlide ) {
  2068. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  2069. if( hasFragments ) {
  2070. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  2071. f = visibleFragments.length - 1;
  2072. }
  2073. }
  2074. return { h: h, v: v, f: f };
  2075. }
  2076. /**
  2077. * Retrieves the total number of slides in this presentation.
  2078. */
  2079. function getTotalSlides() {
  2080. return document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  2081. }
  2082. /**
  2083. * Returns the slide element matching the specified index.
  2084. */
  2085. function getSlide( x, y ) {
  2086. var horizontalSlide = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2087. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2088. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  2089. return verticalSlides ? verticalSlides[ y ] : undefined;
  2090. }
  2091. return horizontalSlide;
  2092. }
  2093. /**
  2094. * Returns the background element for the given slide.
  2095. * All slides, even the ones with no background properties
  2096. * defined, have a background element so as long as the
  2097. * index is valid an element will be returned.
  2098. */
  2099. function getSlideBackground( x, y ) {
  2100. // When printing to PDF the slide backgrounds are nested
  2101. // inside of the slides
  2102. if( isPrintingPDF() ) {
  2103. var slide = getSlide( x, y );
  2104. return slide ? slide.querySelector( '.slide-background' ) : undefined;
  2105. }
  2106. var horizontalBackground = document.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
  2107. var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
  2108. if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
  2109. return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
  2110. }
  2111. return horizontalBackground;
  2112. }
  2113. /**
  2114. * Retrieves the current state of the presentation as
  2115. * an object. This state can then be restored at any
  2116. * time.
  2117. */
  2118. function getState() {
  2119. var indices = getIndices();
  2120. return {
  2121. indexh: indices.h,
  2122. indexv: indices.v,
  2123. indexf: indices.f,
  2124. paused: isPaused(),
  2125. overview: isOverview()
  2126. };
  2127. }
  2128. /**
  2129. * Restores the presentation to the given state.
  2130. *
  2131. * @param {Object} state As generated by getState()
  2132. */
  2133. function setState( state ) {
  2134. if( typeof state === 'object' ) {
  2135. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  2136. var pausedFlag = deserialize( state.paused ),
  2137. overviewFlag = deserialize( state.overview );
  2138. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  2139. togglePause( pausedFlag );
  2140. }
  2141. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  2142. toggleOverview( overviewFlag );
  2143. }
  2144. }
  2145. }
  2146. /**
  2147. * Return a sorted fragments list, ordered by an increasing
  2148. * "data-fragment-index" attribute.
  2149. *
  2150. * Fragments will be revealed in the order that they are returned by
  2151. * this function, so you can use the index attributes to control the
  2152. * order of fragment appearance.
  2153. *
  2154. * To maintain a sensible default fragment order, fragments are presumed
  2155. * to be passed in document order. This function adds a "fragment-index"
  2156. * attribute to each node if such an attribute is not already present,
  2157. * and sets that attribute to an integer value which is the position of
  2158. * the fragment within the fragments list.
  2159. */
  2160. function sortFragments( fragments ) {
  2161. fragments = toArray( fragments );
  2162. var ordered = [],
  2163. unordered = [],
  2164. sorted = [];
  2165. // Group ordered and unordered elements
  2166. fragments.forEach( function( fragment, i ) {
  2167. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  2168. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  2169. if( !ordered[index] ) {
  2170. ordered[index] = [];
  2171. }
  2172. ordered[index].push( fragment );
  2173. }
  2174. else {
  2175. unordered.push( [ fragment ] );
  2176. }
  2177. } );
  2178. // Append fragments without explicit indices in their
  2179. // DOM order
  2180. ordered = ordered.concat( unordered );
  2181. // Manually count the index up per group to ensure there
  2182. // are no gaps
  2183. var index = 0;
  2184. // Push all fragments in their sorted order to an array,
  2185. // this flattens the groups
  2186. ordered.forEach( function( group ) {
  2187. group.forEach( function( fragment ) {
  2188. sorted.push( fragment );
  2189. fragment.setAttribute( 'data-fragment-index', index );
  2190. } );
  2191. index ++;
  2192. } );
  2193. return sorted;
  2194. }
  2195. /**
  2196. * Navigate to the specified slide fragment.
  2197. *
  2198. * @param {Number} index The index of the fragment that
  2199. * should be shown, -1 means all are invisible
  2200. * @param {Number} offset Integer offset to apply to the
  2201. * fragment index
  2202. *
  2203. * @return {Boolean} true if a change was made in any
  2204. * fragments visibility as part of this call
  2205. */
  2206. function navigateFragment( index, offset ) {
  2207. if( currentSlide && config.fragments ) {
  2208. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  2209. if( fragments.length ) {
  2210. // If no index is specified, find the current
  2211. if( typeof index !== 'number' ) {
  2212. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  2213. if( lastVisibleFragment ) {
  2214. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  2215. }
  2216. else {
  2217. index = -1;
  2218. }
  2219. }
  2220. // If an offset is specified, apply it to the index
  2221. if( typeof offset === 'number' ) {
  2222. index += offset;
  2223. }
  2224. var fragmentsShown = [],
  2225. fragmentsHidden = [];
  2226. toArray( fragments ).forEach( function( element, i ) {
  2227. if( element.hasAttribute( 'data-fragment-index' ) ) {
  2228. i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
  2229. }
  2230. // Visible fragments
  2231. if( i <= index ) {
  2232. if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
  2233. element.classList.add( 'visible' );
  2234. element.classList.remove( 'current-fragment' );
  2235. if( i === index ) {
  2236. element.classList.add( 'current-fragment' );
  2237. }
  2238. }
  2239. // Hidden fragments
  2240. else {
  2241. if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
  2242. element.classList.remove( 'visible' );
  2243. element.classList.remove( 'current-fragment' );
  2244. }
  2245. } );
  2246. if( fragmentsHidden.length ) {
  2247. dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
  2248. }
  2249. if( fragmentsShown.length ) {
  2250. dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
  2251. }
  2252. updateControls();
  2253. updateProgress();
  2254. return !!( fragmentsShown.length || fragmentsHidden.length );
  2255. }
  2256. }
  2257. return false;
  2258. }
  2259. /**
  2260. * Navigate to the next slide fragment.
  2261. *
  2262. * @return {Boolean} true if there was a next fragment,
  2263. * false otherwise
  2264. */
  2265. function nextFragment() {
  2266. return navigateFragment( null, 1 );
  2267. }
  2268. /**
  2269. * Navigate to the previous slide fragment.
  2270. *
  2271. * @return {Boolean} true if there was a previous fragment,
  2272. * false otherwise
  2273. */
  2274. function previousFragment() {
  2275. return navigateFragment( null, -1 );
  2276. }
  2277. /**
  2278. * Cues a new automated slide if enabled in the config.
  2279. */
  2280. function cueAutoSlide() {
  2281. cancelAutoSlide();
  2282. if( currentSlide ) {
  2283. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2284. var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null;
  2285. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  2286. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  2287. // Pick value in the following priority order:
  2288. // 1. Current fragment's data-autoslide
  2289. // 2. Current slide's data-autoslide
  2290. // 3. Parent slide's data-autoslide
  2291. // 4. Global autoSlide setting
  2292. if( fragmentAutoSlide ) {
  2293. autoSlide = parseInt( fragmentAutoSlide, 10 );
  2294. }
  2295. else if( slideAutoSlide ) {
  2296. autoSlide = parseInt( slideAutoSlide, 10 );
  2297. }
  2298. else if( parentAutoSlide ) {
  2299. autoSlide = parseInt( parentAutoSlide, 10 );
  2300. }
  2301. else {
  2302. autoSlide = config.autoSlide;
  2303. }
  2304. // If there are media elements with data-autoplay,
  2305. // automatically set the autoSlide duration to the
  2306. // length of that media
  2307. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2308. if( el.hasAttribute( 'data-autoplay' ) ) {
  2309. if( autoSlide && el.duration * 1000 > autoSlide ) {
  2310. autoSlide = ( el.duration * 1000 ) + 1000;
  2311. }
  2312. }
  2313. } );
  2314. // Cue the next auto-slide if:
  2315. // - There is an autoSlide value
  2316. // - Auto-sliding isn't paused by the user
  2317. // - The presentation isn't paused
  2318. // - The overview isn't active
  2319. // - The presentation isn't over
  2320. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || config.loop === true ) ) {
  2321. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  2322. autoSlideStartTime = Date.now();
  2323. }
  2324. if( autoSlidePlayer ) {
  2325. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  2326. }
  2327. }
  2328. }
  2329. /**
  2330. * Cancels any ongoing request to auto-slide.
  2331. */
  2332. function cancelAutoSlide() {
  2333. clearTimeout( autoSlideTimeout );
  2334. autoSlideTimeout = -1;
  2335. }
  2336. function pauseAutoSlide() {
  2337. if( autoSlide && !autoSlidePaused ) {
  2338. autoSlidePaused = true;
  2339. dispatchEvent( 'autoslidepaused' );
  2340. clearTimeout( autoSlideTimeout );
  2341. if( autoSlidePlayer ) {
  2342. autoSlidePlayer.setPlaying( false );
  2343. }
  2344. }
  2345. }
  2346. function resumeAutoSlide() {
  2347. if( autoSlide && autoSlidePaused ) {
  2348. autoSlidePaused = false;
  2349. dispatchEvent( 'autoslideresumed' );
  2350. cueAutoSlide();
  2351. }
  2352. }
  2353. function navigateLeft() {
  2354. // Reverse for RTL
  2355. if( config.rtl ) {
  2356. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  2357. slide( indexh + 1 );
  2358. }
  2359. }
  2360. // Normal navigation
  2361. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  2362. slide( indexh - 1 );
  2363. }
  2364. }
  2365. function navigateRight() {
  2366. // Reverse for RTL
  2367. if( config.rtl ) {
  2368. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  2369. slide( indexh - 1 );
  2370. }
  2371. }
  2372. // Normal navigation
  2373. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  2374. slide( indexh + 1 );
  2375. }
  2376. }
  2377. function navigateUp() {
  2378. // Prioritize hiding fragments
  2379. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  2380. slide( indexh, indexv - 1 );
  2381. }
  2382. }
  2383. function navigateDown() {
  2384. // Prioritize revealing fragments
  2385. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  2386. slide( indexh, indexv + 1 );
  2387. }
  2388. }
  2389. /**
  2390. * Navigates backwards, prioritized in the following order:
  2391. * 1) Previous fragment
  2392. * 2) Previous vertical slide
  2393. * 3) Previous horizontal slide
  2394. */
  2395. function navigatePrev() {
  2396. // Prioritize revealing fragments
  2397. if( previousFragment() === false ) {
  2398. if( availableRoutes().up ) {
  2399. navigateUp();
  2400. }
  2401. else {
  2402. // Fetch the previous horizontal slide, if there is one
  2403. var previousSlide = document.querySelector( HORIZONTAL_SLIDES_SELECTOR + '.past:nth-child(' + indexh + ')' );
  2404. if( previousSlide ) {
  2405. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  2406. var h = indexh - 1;
  2407. slide( h, v );
  2408. }
  2409. }
  2410. }
  2411. }
  2412. /**
  2413. * Same as #navigatePrev() but navigates forwards.
  2414. */
  2415. function navigateNext() {
  2416. // Prioritize revealing fragments
  2417. if( nextFragment() === false ) {
  2418. availableRoutes().down ? navigateDown() : navigateRight();
  2419. }
  2420. // If auto-sliding is enabled we need to cue up
  2421. // another timeout
  2422. cueAutoSlide();
  2423. }
  2424. // --------------------------------------------------------------------//
  2425. // ----------------------------- EVENTS -------------------------------//
  2426. // --------------------------------------------------------------------//
  2427. /**
  2428. * Called by all event handlers that are based on user
  2429. * input.
  2430. */
  2431. function onUserInput( event ) {
  2432. if( config.autoSlideStoppable ) {
  2433. pauseAutoSlide();
  2434. }
  2435. }
  2436. /**
  2437. * Handler for the document level 'keydown' event.
  2438. */
  2439. function onDocumentKeyDown( event ) {
  2440. // If there's a condition specified and it returns false,
  2441. // ignore this event
  2442. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
  2443. return true;
  2444. }
  2445. // Remember if auto-sliding was paused so we can toggle it
  2446. var autoSlideWasPaused = autoSlidePaused;
  2447. onUserInput( event );
  2448. // Check if there's a focused element that could be using
  2449. // the keyboard
  2450. var activeElement = document.activeElement;
  2451. var hasFocus = !!( document.activeElement && ( document.activeElement.type || document.activeElement.href || document.activeElement.contentEditable !== 'inherit' ) );
  2452. // Disregard the event if there's a focused element or a
  2453. // keyboard modifier key is present
  2454. if( hasFocus || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  2455. // While paused only allow "unpausing" keyboard events (b and .)
  2456. if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) {
  2457. return false;
  2458. }
  2459. var triggered = false;
  2460. // 1. User defined key bindings
  2461. if( typeof config.keyboard === 'object' ) {
  2462. for( var key in config.keyboard ) {
  2463. // Check if this binding matches the pressed key
  2464. if( parseInt( key, 10 ) === event.keyCode ) {
  2465. var value = config.keyboard[ key ];
  2466. // Callback function
  2467. if( typeof value === 'function' ) {
  2468. value.apply( null, [ event ] );
  2469. }
  2470. // String shortcuts to reveal.js API
  2471. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  2472. Reveal[ value ].call();
  2473. }
  2474. triggered = true;
  2475. }
  2476. }
  2477. }
  2478. // 2. System defined key bindings
  2479. if( triggered === false ) {
  2480. // Assume true and try to prove false
  2481. triggered = true;
  2482. switch( event.keyCode ) {
  2483. // p, page up
  2484. case 80: case 33: navigatePrev(); break;
  2485. // n, page down
  2486. case 78: case 34: navigateNext(); break;
  2487. // h, left
  2488. case 72: case 37: navigateLeft(); break;
  2489. // l, right
  2490. case 76: case 39: navigateRight(); break;
  2491. // k, up
  2492. case 75: case 38: navigateUp(); break;
  2493. // j, down
  2494. case 74: case 40: navigateDown(); break;
  2495. // home
  2496. case 36: slide( 0 ); break;
  2497. // end
  2498. case 35: slide( Number.MAX_VALUE ); break;
  2499. // space
  2500. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  2501. // return
  2502. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  2503. // two-spot, semicolon, b, period, Logitech presenter tools "black screen" button
  2504. case 58: case 59: case 66: case 190: case 191: togglePause(); break;
  2505. // f
  2506. case 70: enterFullscreen(); break;
  2507. // a
  2508. case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
  2509. default:
  2510. triggered = false;
  2511. }
  2512. }
  2513. // If the input resulted in a triggered action we should prevent
  2514. // the browsers default behavior
  2515. if( triggered ) {
  2516. event.preventDefault && event.preventDefault();
  2517. }
  2518. // ESC or O key
  2519. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  2520. if( dom.preview ) {
  2521. closePreview();
  2522. }
  2523. else {
  2524. toggleOverview();
  2525. }
  2526. event.preventDefault && event.preventDefault();
  2527. }
  2528. // If auto-sliding is enabled we need to cue up
  2529. // another timeout
  2530. cueAutoSlide();
  2531. }
  2532. /**
  2533. * Handler for the 'touchstart' event, enables support for
  2534. * swipe and pinch gestures.
  2535. */
  2536. function onTouchStart( event ) {
  2537. touch.startX = event.touches[0].clientX;
  2538. touch.startY = event.touches[0].clientY;
  2539. touch.startCount = event.touches.length;
  2540. // If there's two touches we need to memorize the distance
  2541. // between those two points to detect pinching
  2542. if( event.touches.length === 2 && config.overview ) {
  2543. touch.startSpan = distanceBetween( {
  2544. x: event.touches[1].clientX,
  2545. y: event.touches[1].clientY
  2546. }, {
  2547. x: touch.startX,
  2548. y: touch.startY
  2549. } );
  2550. }
  2551. }
  2552. /**
  2553. * Handler for the 'touchmove' event.
  2554. */
  2555. function onTouchMove( event ) {
  2556. // Each touch should only trigger one action
  2557. if( !touch.captured ) {
  2558. onUserInput( event );
  2559. var currentX = event.touches[0].clientX;
  2560. var currentY = event.touches[0].clientY;
  2561. // If the touch started with two points and still has
  2562. // two active touches; test for the pinch gesture
  2563. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  2564. // The current distance in pixels between the two touch points
  2565. var currentSpan = distanceBetween( {
  2566. x: event.touches[1].clientX,
  2567. y: event.touches[1].clientY
  2568. }, {
  2569. x: touch.startX,
  2570. y: touch.startY
  2571. } );
  2572. // If the span is larger than the desire amount we've got
  2573. // ourselves a pinch
  2574. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  2575. touch.captured = true;
  2576. if( currentSpan < touch.startSpan ) {
  2577. activateOverview();
  2578. }
  2579. else {
  2580. deactivateOverview();
  2581. }
  2582. }
  2583. event.preventDefault();
  2584. }
  2585. // There was only one touch point, look for a swipe
  2586. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  2587. var deltaX = currentX - touch.startX,
  2588. deltaY = currentY - touch.startY;
  2589. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2590. touch.captured = true;
  2591. navigateLeft();
  2592. }
  2593. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2594. touch.captured = true;
  2595. navigateRight();
  2596. }
  2597. else if( deltaY > touch.threshold ) {
  2598. touch.captured = true;
  2599. navigateUp();
  2600. }
  2601. else if( deltaY < -touch.threshold ) {
  2602. touch.captured = true;
  2603. navigateDown();
  2604. }
  2605. // If we're embedded, only block touch events if they have
  2606. // triggered an action
  2607. if( config.embedded ) {
  2608. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  2609. event.preventDefault();
  2610. }
  2611. }
  2612. // Not embedded? Block them all to avoid needless tossing
  2613. // around of the viewport in iOS
  2614. else {
  2615. event.preventDefault();
  2616. }
  2617. }
  2618. }
  2619. // There's a bug with swiping on some Android devices unless
  2620. // the default action is always prevented
  2621. else if( navigator.userAgent.match( /android/gi ) ) {
  2622. event.preventDefault();
  2623. }
  2624. }
  2625. /**
  2626. * Handler for the 'touchend' event.
  2627. */
  2628. function onTouchEnd( event ) {
  2629. touch.captured = false;
  2630. }
  2631. /**
  2632. * Convert pointer down to touch start.
  2633. */
  2634. function onPointerDown( event ) {
  2635. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2636. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2637. onTouchStart( event );
  2638. }
  2639. }
  2640. /**
  2641. * Convert pointer move to touch move.
  2642. */
  2643. function onPointerMove( event ) {
  2644. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2645. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2646. onTouchMove( event );
  2647. }
  2648. }
  2649. /**
  2650. * Convert pointer up to touch end.
  2651. */
  2652. function onPointerUp( event ) {
  2653. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2654. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2655. onTouchEnd( event );
  2656. }
  2657. }
  2658. /**
  2659. * Handles mouse wheel scrolling, throttled to avoid skipping
  2660. * multiple slides.
  2661. */
  2662. function onDocumentMouseScroll( event ) {
  2663. if( Date.now() - lastMouseWheelStep > 600 ) {
  2664. lastMouseWheelStep = Date.now();
  2665. var delta = event.detail || -event.wheelDelta;
  2666. if( delta > 0 ) {
  2667. navigateNext();
  2668. }
  2669. else {
  2670. navigatePrev();
  2671. }
  2672. }
  2673. }
  2674. /**
  2675. * Clicking on the progress bar results in a navigation to the
  2676. * closest approximate horizontal slide using this equation:
  2677. *
  2678. * ( clickX / presentationWidth ) * numberOfSlides
  2679. */
  2680. function onProgressClicked( event ) {
  2681. onUserInput( event );
  2682. event.preventDefault();
  2683. var slidesTotal = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  2684. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  2685. slide( slideIndex );
  2686. }
  2687. /**
  2688. * Event handler for navigation control buttons.
  2689. */
  2690. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  2691. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  2692. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  2693. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  2694. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  2695. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  2696. /**
  2697. * Handler for the window level 'hashchange' event.
  2698. */
  2699. function onWindowHashChange( event ) {
  2700. readURL();
  2701. }
  2702. /**
  2703. * Handler for the window level 'resize' event.
  2704. */
  2705. function onWindowResize( event ) {
  2706. layout();
  2707. }
  2708. /**
  2709. * Handle for the window level 'visibilitychange' event.
  2710. */
  2711. function onPageVisibilityChange( event ) {
  2712. var isHidden = document.webkitHidden ||
  2713. document.msHidden ||
  2714. document.hidden;
  2715. // If, after clicking a link or similar and we're coming back,
  2716. // focus the document.body to ensure we can use keyboard shortcuts
  2717. if( isHidden === false && document.activeElement !== document.body ) {
  2718. document.activeElement.blur();
  2719. document.body.focus();
  2720. }
  2721. }
  2722. /**
  2723. * Invoked when a slide is and we're in the overview.
  2724. */
  2725. function onOverviewSlideClicked( event ) {
  2726. // TODO There's a bug here where the event listeners are not
  2727. // removed after deactivating the overview.
  2728. if( eventsAreBound && isOverview() ) {
  2729. event.preventDefault();
  2730. var element = event.target;
  2731. while( element && !element.nodeName.match( /section/gi ) ) {
  2732. element = element.parentNode;
  2733. }
  2734. if( element && !element.classList.contains( 'disabled' ) ) {
  2735. deactivateOverview();
  2736. if( element.nodeName.match( /section/gi ) ) {
  2737. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  2738. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  2739. slide( h, v );
  2740. }
  2741. }
  2742. }
  2743. }
  2744. /**
  2745. * Handles clicks on links that are set to preview in the
  2746. * iframe overlay.
  2747. */
  2748. function onPreviewLinkClicked( event ) {
  2749. var url = event.target.getAttribute( 'href' );
  2750. if( url ) {
  2751. openPreview( url );
  2752. event.preventDefault();
  2753. }
  2754. }
  2755. /**
  2756. * Handles click on the auto-sliding controls element.
  2757. */
  2758. function onAutoSlidePlayerClick( event ) {
  2759. // Replay
  2760. if( Reveal.isLastSlide() && config.loop === false ) {
  2761. slide( 0, 0 );
  2762. resumeAutoSlide();
  2763. }
  2764. // Resume
  2765. else if( autoSlidePaused ) {
  2766. resumeAutoSlide();
  2767. }
  2768. // Pause
  2769. else {
  2770. pauseAutoSlide();
  2771. }
  2772. }
  2773. // --------------------------------------------------------------------//
  2774. // ------------------------ PLAYBACK COMPONENT ------------------------//
  2775. // --------------------------------------------------------------------//
  2776. /**
  2777. * Constructor for the playback component, which displays
  2778. * play/pause/progress controls.
  2779. *
  2780. * @param {HTMLElement} container The component will append
  2781. * itself to this
  2782. * @param {Function} progressCheck A method which will be
  2783. * called frequently to get the current progress on a range
  2784. * of 0-1
  2785. */
  2786. function Playback( container, progressCheck ) {
  2787. // Cosmetics
  2788. this.diameter = 50;
  2789. this.thickness = 3;
  2790. // Flags if we are currently playing
  2791. this.playing = false;
  2792. // Current progress on a 0-1 range
  2793. this.progress = 0;
  2794. // Used to loop the animation smoothly
  2795. this.progressOffset = 1;
  2796. this.container = container;
  2797. this.progressCheck = progressCheck;
  2798. this.canvas = document.createElement( 'canvas' );
  2799. this.canvas.className = 'playback';
  2800. this.canvas.width = this.diameter;
  2801. this.canvas.height = this.diameter;
  2802. this.context = this.canvas.getContext( '2d' );
  2803. this.container.appendChild( this.canvas );
  2804. this.render();
  2805. }
  2806. Playback.prototype.setPlaying = function( value ) {
  2807. var wasPlaying = this.playing;
  2808. this.playing = value;
  2809. // Start repainting if we weren't already
  2810. if( !wasPlaying && this.playing ) {
  2811. this.animate();
  2812. }
  2813. else {
  2814. this.render();
  2815. }
  2816. };
  2817. Playback.prototype.animate = function() {
  2818. var progressBefore = this.progress;
  2819. this.progress = this.progressCheck();
  2820. // When we loop, offset the progress so that it eases
  2821. // smoothly rather than immediately resetting
  2822. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  2823. this.progressOffset = this.progress;
  2824. }
  2825. this.render();
  2826. if( this.playing ) {
  2827. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  2828. }
  2829. };
  2830. /**
  2831. * Renders the current progress and playback state.
  2832. */
  2833. Playback.prototype.render = function() {
  2834. var progress = this.playing ? this.progress : 0,
  2835. radius = ( this.diameter / 2 ) - this.thickness,
  2836. x = this.diameter / 2,
  2837. y = this.diameter / 2,
  2838. iconSize = 14;
  2839. // Ease towards 1
  2840. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  2841. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  2842. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  2843. this.context.save();
  2844. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  2845. // Solid background color
  2846. this.context.beginPath();
  2847. this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false );
  2848. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  2849. this.context.fill();
  2850. // Draw progress track
  2851. this.context.beginPath();
  2852. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  2853. this.context.lineWidth = this.thickness;
  2854. this.context.strokeStyle = '#666';
  2855. this.context.stroke();
  2856. if( this.playing ) {
  2857. // Draw progress on top of track
  2858. this.context.beginPath();
  2859. this.context.arc( x, y, radius, startAngle, endAngle, false );
  2860. this.context.lineWidth = this.thickness;
  2861. this.context.strokeStyle = '#fff';
  2862. this.context.stroke();
  2863. }
  2864. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  2865. // Draw play/pause icons
  2866. if( this.playing ) {
  2867. this.context.fillStyle = '#fff';
  2868. this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize );
  2869. this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize );
  2870. }
  2871. else {
  2872. this.context.beginPath();
  2873. this.context.translate( 2, 0 );
  2874. this.context.moveTo( 0, 0 );
  2875. this.context.lineTo( iconSize - 2, iconSize / 2 );
  2876. this.context.lineTo( 0, iconSize );
  2877. this.context.fillStyle = '#fff';
  2878. this.context.fill();
  2879. }
  2880. this.context.restore();
  2881. };
  2882. Playback.prototype.on = function( type, listener ) {
  2883. this.canvas.addEventListener( type, listener, false );
  2884. };
  2885. Playback.prototype.off = function( type, listener ) {
  2886. this.canvas.removeEventListener( type, listener, false );
  2887. };
  2888. Playback.prototype.destroy = function() {
  2889. this.playing = false;
  2890. if( this.canvas.parentNode ) {
  2891. this.container.removeChild( this.canvas );
  2892. }
  2893. };
  2894. // --------------------------------------------------------------------//
  2895. // ------------------------------- API --------------------------------//
  2896. // --------------------------------------------------------------------//
  2897. Reveal = {
  2898. initialize: initialize,
  2899. configure: configure,
  2900. sync: sync,
  2901. // Navigation methods
  2902. slide: slide,
  2903. left: navigateLeft,
  2904. right: navigateRight,
  2905. up: navigateUp,
  2906. down: navigateDown,
  2907. prev: navigatePrev,
  2908. next: navigateNext,
  2909. // Fragment methods
  2910. navigateFragment: navigateFragment,
  2911. prevFragment: previousFragment,
  2912. nextFragment: nextFragment,
  2913. // Deprecated aliases
  2914. navigateTo: slide,
  2915. navigateLeft: navigateLeft,
  2916. navigateRight: navigateRight,
  2917. navigateUp: navigateUp,
  2918. navigateDown: navigateDown,
  2919. navigatePrev: navigatePrev,
  2920. navigateNext: navigateNext,
  2921. // Forces an update in slide layout
  2922. layout: layout,
  2923. // Returns an object with the available routes as booleans (left/right/top/bottom)
  2924. availableRoutes: availableRoutes,
  2925. // Returns an object with the available fragments as booleans (prev/next)
  2926. availableFragments: availableFragments,
  2927. // Toggles the overview mode on/off
  2928. toggleOverview: toggleOverview,
  2929. // Toggles the "black screen" mode on/off
  2930. togglePause: togglePause,
  2931. // Toggles the auto slide mode on/off
  2932. toggleAutoSlide: toggleAutoSlide,
  2933. // State checks
  2934. isOverview: isOverview,
  2935. isPaused: isPaused,
  2936. isAutoSliding: isAutoSliding,
  2937. // Adds or removes all internal event listeners (such as keyboard)
  2938. addEventListeners: addEventListeners,
  2939. removeEventListeners: removeEventListeners,
  2940. // Facility for persisting and restoring the presentation state
  2941. getState: getState,
  2942. setState: setState,
  2943. // Presentation progress on range of 0-1
  2944. getProgress: getProgress,
  2945. // Returns the indices of the current, or specified, slide
  2946. getIndices: getIndices,
  2947. getTotalSlides: getTotalSlides,
  2948. // Returns the slide element at the specified index
  2949. getSlide: getSlide,
  2950. // Returns the slide background element at the specified index
  2951. getSlideBackground: getSlideBackground,
  2952. // Returns the previous slide element, may be null
  2953. getPreviousSlide: function() {
  2954. return previousSlide;
  2955. },
  2956. // Returns the current slide element
  2957. getCurrentSlide: function() {
  2958. return currentSlide;
  2959. },
  2960. // Returns the current scale of the presentation content
  2961. getScale: function() {
  2962. return scale;
  2963. },
  2964. // Returns the current configuration object
  2965. getConfig: function() {
  2966. return config;
  2967. },
  2968. // Helper method, retrieves query string as a key/value hash
  2969. getQueryHash: function() {
  2970. var query = {};
  2971. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  2972. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  2973. } );
  2974. // Basic deserialization
  2975. for( var i in query ) {
  2976. var value = query[ i ];
  2977. query[ i ] = deserialize( unescape( value ) );
  2978. }
  2979. return query;
  2980. },
  2981. // Returns true if we're currently on the first slide
  2982. isFirstSlide: function() {
  2983. return document.querySelector( SLIDES_SELECTOR + '.past' ) == null ? true : false;
  2984. },
  2985. // Returns true if we're currently on the last slide
  2986. isLastSlide: function() {
  2987. if( currentSlide ) {
  2988. // Does this slide has next a sibling?
  2989. if( currentSlide.nextElementSibling ) return false;
  2990. // If it's vertical, does its parent have a next sibling?
  2991. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  2992. return true;
  2993. }
  2994. return false;
  2995. },
  2996. // Checks if reveal.js has been loaded and is ready for use
  2997. isReady: function() {
  2998. return loaded;
  2999. },
  3000. // Forward event binding to the reveal DOM element
  3001. addEventListener: function( type, listener, useCapture ) {
  3002. if( 'addEventListener' in window ) {
  3003. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  3004. }
  3005. },
  3006. removeEventListener: function( type, listener, useCapture ) {
  3007. if( 'addEventListener' in window ) {
  3008. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  3009. }
  3010. },
  3011. // Programatically triggers a keyboard event
  3012. triggerKey: function( keyCode ) {
  3013. onDocumentKeyDown( { keyCode: keyCode } );
  3014. }
  3015. };
  3016. return Reveal;
  3017. }));