reveal.js 116 KB

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  1. /*!
  2. * reveal.js
  3. * http://lab.hakim.se/reveal-js
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2015 Hakim El Hattab, http://hakim.se
  7. */
  8. (function( root, factory ) {
  9. if( typeof define === 'function' && define.amd ) {
  10. // AMD. Register as an anonymous module.
  11. define( function() {
  12. root.Reveal = factory();
  13. return root.Reveal;
  14. } );
  15. } else if( typeof exports === 'object' ) {
  16. // Node. Does not work with strict CommonJS.
  17. module.exports = factory();
  18. } else {
  19. // Browser globals.
  20. root.Reveal = factory();
  21. }
  22. }( this, function() {
  23. 'use strict';
  24. var Reveal;
  25. var SLIDES_SELECTOR = '.slides section',
  26. HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
  27. VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
  28. HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
  29. // 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: 1.5,
  40. // Display controls in the bottom right corner
  41. controls: true,
  42. // Display a presentation progress bar
  43. progress: true,
  44. // Display the page number of the current slide
  45. slideNumber: false,
  46. // Push each slide change to the browser history
  47. history: false,
  48. // Enable keyboard shortcuts for navigation
  49. keyboard: true,
  50. // Optional function that blocks keyboard events when retuning false
  51. keyboardCondition: null,
  52. // Enable the slide overview mode
  53. overview: true,
  54. // Vertical centering of slides
  55. center: true,
  56. // Enables touch navigation on devices with touch input
  57. touch: true,
  58. // Loop the presentation
  59. loop: false,
  60. // Change the presentation direction to be RTL
  61. rtl: false,
  62. // Turns fragments on and off globally
  63. fragments: true,
  64. // Flags if the presentation is running in an embedded mode,
  65. // i.e. contained within a limited portion of the screen
  66. embedded: false,
  67. // Flags if we should show a help overlay when the questionmark
  68. // key is pressed
  69. help: true,
  70. // Flags if it should be possible to pause the presentation (blackout)
  71. pause: true,
  72. // Number of milliseconds between automatically proceeding to the
  73. // next slide, disabled when set to 0, this value can be overwritten
  74. // by using a data-autoslide attribute on your slides
  75. autoSlide: 0,
  76. // Stop auto-sliding after user input
  77. autoSlideStoppable: true,
  78. // Enable slide navigation via mouse wheel
  79. mouseWheel: false,
  80. // Apply a 3D roll to links on hover
  81. rollingLinks: false,
  82. // Hides the address bar on mobile devices
  83. hideAddressBar: true,
  84. // Opens links in an iframe preview overlay
  85. previewLinks: false,
  86. // Exposes the reveal.js API through window.postMessage
  87. postMessage: true,
  88. // Dispatches all reveal.js events to the parent window through postMessage
  89. postMessageEvents: false,
  90. // Focuses body when page changes visiblity to ensure keyboard shortcuts work
  91. focusBodyOnPageVisibilityChange: true,
  92. // Transition style
  93. transition: 'slide', // none/fade/slide/convex/concave/zoom
  94. // Transition speed
  95. transitionSpeed: 'default', // default/fast/slow
  96. // Transition style for full page slide backgrounds
  97. backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
  98. // Parallax background image
  99. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  100. // Parallax background size
  101. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  102. // Number of slides away from the current that are visible
  103. viewDistance: 3,
  104. // Script dependencies to load
  105. dependencies: []
  106. },
  107. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  108. loaded = false,
  109. // Flags if the overview mode is currently active
  110. overview = false,
  111. // The horizontal and vertical index of the currently active slide
  112. indexh,
  113. indexv,
  114. // The previous and current slide HTML elements
  115. previousSlide,
  116. currentSlide,
  117. previousBackground,
  118. // Slides may hold a data-state attribute which we pick up and apply
  119. // as a class to the body. This list contains the combined state of
  120. // all current slides.
  121. state = [],
  122. // The current scale of the presentation (see width/height config)
  123. scale = 1,
  124. // The transform that is currently applied to the slides container
  125. slidesTransform = '',
  126. layoutTransform = '',
  127. // Cached references to DOM elements
  128. dom = {},
  129. // Features supported by the browser, see #checkCapabilities()
  130. features = {},
  131. // Client is a mobile device, see #checkCapabilities()
  132. isMobileDevice,
  133. // Throttles mouse wheel navigation
  134. lastMouseWheelStep = 0,
  135. // Delays updates to the URL due to a Chrome thumbnailer bug
  136. writeURLTimeout = 0,
  137. // Flags if the interaction event listeners are bound
  138. eventsAreBound = false,
  139. // The current auto-slide duration
  140. autoSlide = 0,
  141. // Auto slide properties
  142. autoSlidePlayer,
  143. autoSlideTimeout = 0,
  144. autoSlideStartTime = -1,
  145. autoSlidePaused = false,
  146. // Holds information about the currently ongoing touch input
  147. touch = {
  148. startX: 0,
  149. startY: 0,
  150. startSpan: 0,
  151. startCount: 0,
  152. captured: false,
  153. threshold: 40
  154. },
  155. // Holds information about the keyboard shortcuts
  156. keyboardShortcuts = {
  157. 'N , SPACE': 'Next slide',
  158. 'P': 'Previous slide',
  159. '← , H': 'Navigate left',
  160. '→ , L': 'Navigate right',
  161. '↑ , K': 'Navigate up',
  162. '↓ , J': 'Navigate down',
  163. 'Home': 'First slide',
  164. 'End': 'Last slide',
  165. 'B , .': 'Pause',
  166. 'F': 'Fullscreen',
  167. 'ESC, O': 'Slide overview'
  168. };
  169. /**
  170. * Starts up the presentation if the client is capable.
  171. */
  172. function initialize( options ) {
  173. checkCapabilities();
  174. if( !features.transforms2d && !features.transforms3d ) {
  175. document.body.setAttribute( 'class', 'no-transforms' );
  176. // Since JS won't be running any further, we need to load all
  177. // images that were intended to lazy load now
  178. var images = document.getElementsByTagName( 'img' );
  179. for( var i = 0, len = images.length; i < len; i++ ) {
  180. var image = images[i];
  181. if( image.getAttribute( 'data-src' ) ) {
  182. image.setAttribute( 'src', image.getAttribute( 'data-src' ) );
  183. image.removeAttribute( 'data-src' );
  184. }
  185. }
  186. // If the browser doesn't support core features we won't be
  187. // using JavaScript to control the presentation
  188. return;
  189. }
  190. // Cache references to key DOM elements
  191. dom.wrapper = document.querySelector( '.reveal' );
  192. dom.slides = document.querySelector( '.reveal .slides' );
  193. // Force a layout when the whole page, incl fonts, has loaded
  194. window.addEventListener( 'load', layout, false );
  195. var query = Reveal.getQueryHash();
  196. // Do not accept new dependencies via query config to avoid
  197. // the potential of malicious script injection
  198. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  199. // Copy options over to our config object
  200. extend( config, options );
  201. extend( config, query );
  202. // Hide the address bar in mobile browsers
  203. hideAddressBar();
  204. // Loads the dependencies and continues to #start() once done
  205. load();
  206. }
  207. /**
  208. * Inspect the client to see what it's capable of, this
  209. * should only happens once per runtime.
  210. */
  211. function checkCapabilities() {
  212. features.transforms3d = 'WebkitPerspective' in document.body.style ||
  213. 'MozPerspective' in document.body.style ||
  214. 'msPerspective' in document.body.style ||
  215. 'OPerspective' in document.body.style ||
  216. 'perspective' in document.body.style;
  217. features.transforms2d = 'WebkitTransform' in document.body.style ||
  218. 'MozTransform' in document.body.style ||
  219. 'msTransform' in document.body.style ||
  220. 'OTransform' in document.body.style ||
  221. 'transform' in document.body.style;
  222. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  223. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  224. features.canvas = !!document.createElement( 'canvas' ).getContext;
  225. features.touch = !!( 'ontouchstart' in window );
  226. isMobileDevice = navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi );
  227. }
  228. /**
  229. * Loads the dependencies of reveal.js. Dependencies are
  230. * defined via the configuration option 'dependencies'
  231. * and will be loaded prior to starting/binding reveal.js.
  232. * Some dependencies may have an 'async' flag, if so they
  233. * will load after reveal.js has been started up.
  234. */
  235. function load() {
  236. var scripts = [],
  237. scriptsAsync = [],
  238. scriptsToPreload = 0;
  239. // Called once synchronous scripts finish loading
  240. function proceed() {
  241. if( scriptsAsync.length ) {
  242. // Load asynchronous scripts
  243. head.js.apply( null, scriptsAsync );
  244. }
  245. start();
  246. }
  247. function loadScript( s ) {
  248. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
  249. // Extension may contain callback functions
  250. if( typeof s.callback === 'function' ) {
  251. s.callback.apply( this );
  252. }
  253. if( --scriptsToPreload === 0 ) {
  254. proceed();
  255. }
  256. });
  257. }
  258. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  259. var s = config.dependencies[i];
  260. // Load if there's no condition or the condition is truthy
  261. if( !s.condition || s.condition() ) {
  262. if( s.async ) {
  263. scriptsAsync.push( s.src );
  264. }
  265. else {
  266. scripts.push( s.src );
  267. }
  268. loadScript( s );
  269. }
  270. }
  271. if( scripts.length ) {
  272. scriptsToPreload = scripts.length;
  273. // Load synchronous scripts
  274. head.js.apply( null, scripts );
  275. }
  276. else {
  277. proceed();
  278. }
  279. }
  280. /**
  281. * Starts up reveal.js by binding input events and navigating
  282. * to the current URL deeplink if there is one.
  283. */
  284. function start() {
  285. // Make sure we've got all the DOM elements we need
  286. setupDOM();
  287. // Listen to messages posted to this window
  288. setupPostMessage();
  289. // Resets all vertical slides so that only the first is visible
  290. resetVerticalSlides();
  291. // Updates the presentation to match the current configuration values
  292. configure();
  293. // Read the initial hash
  294. readURL();
  295. // Update all backgrounds
  296. updateBackground( true );
  297. // Notify listeners that the presentation is ready but use a 1ms
  298. // timeout to ensure it's not fired synchronously after #initialize()
  299. setTimeout( function() {
  300. // Enable transitions now that we're loaded
  301. dom.slides.classList.remove( 'no-transition' );
  302. loaded = true;
  303. dispatchEvent( 'ready', {
  304. 'indexh': indexh,
  305. 'indexv': indexv,
  306. 'currentSlide': currentSlide
  307. } );
  308. }, 1 );
  309. // Special setup and config is required when printing to PDF
  310. if( isPrintingPDF() ) {
  311. removeEventListeners();
  312. // The document needs to have loaded for the PDF layout
  313. // measurements to be accurate
  314. if( document.readyState === 'complete' ) {
  315. setupPDF();
  316. }
  317. else {
  318. window.addEventListener( 'load', setupPDF );
  319. }
  320. }
  321. }
  322. /**
  323. * Finds and stores references to DOM elements which are
  324. * required by the presentation. If a required element is
  325. * not found, it is created.
  326. */
  327. function setupDOM() {
  328. // Prevent transitions while we're loading
  329. dom.slides.classList.add( 'no-transition' );
  330. // Background element
  331. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  332. // Progress bar
  333. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  334. dom.progressbar = dom.progress.querySelector( 'span' );
  335. // Arrow controls
  336. createSingletonNode( dom.wrapper, 'aside', 'controls',
  337. '<div class="navigate-left"></div>' +
  338. '<div class="navigate-right"></div>' +
  339. '<div class="navigate-up"></div>' +
  340. '<div class="navigate-down"></div>' );
  341. // Slide number
  342. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  343. // Overlay graphic which is displayed during the paused mode
  344. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  345. // Cache references to elements
  346. dom.controls = document.querySelector( '.reveal .controls' );
  347. dom.theme = document.querySelector( '#theme' );
  348. dom.wrapper.setAttribute( 'role', 'application' );
  349. // There can be multiple instances of controls throughout the page
  350. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  351. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  352. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  353. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  354. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  355. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  356. dom.statusDiv = createStatusDiv();
  357. }
  358. /**
  359. * Creates a hidden div with role aria-live to announce the
  360. * current slide content. Hide the div off-screen to make it
  361. * available only to Assistive Technologies.
  362. */
  363. function createStatusDiv() {
  364. var statusDiv = document.getElementById( 'aria-status-div' );
  365. if( !statusDiv ) {
  366. statusDiv = document.createElement( 'div' );
  367. statusDiv.style.position = 'absolute';
  368. statusDiv.style.height = '1px';
  369. statusDiv.style.width = '1px';
  370. statusDiv.style.overflow ='hidden';
  371. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  372. statusDiv.setAttribute( 'id', 'aria-status-div' );
  373. statusDiv.setAttribute( 'aria-live', 'polite' );
  374. statusDiv.setAttribute( 'aria-atomic','true' );
  375. dom.wrapper.appendChild( statusDiv );
  376. }
  377. return statusDiv;
  378. }
  379. /**
  380. * Configures the presentation for printing to a static
  381. * PDF.
  382. */
  383. function setupPDF() {
  384. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  385. // Dimensions of the PDF pages
  386. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  387. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  388. // Dimensions of slides within the pages
  389. var slideWidth = slideSize.width,
  390. slideHeight = slideSize.height;
  391. // Let the browser know what page size we want to print
  392. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' );
  393. // Limit the size of certain elements to the dimensions of the slide
  394. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  395. document.body.classList.add( 'print-pdf' );
  396. document.body.style.width = pageWidth + 'px';
  397. document.body.style.height = pageHeight + 'px';
  398. // Slide and slide background layout
  399. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  400. // Vertical stacks are not centred since their section
  401. // children will be
  402. if( slide.classList.contains( 'stack' ) === false ) {
  403. // Center the slide inside of the page, giving the slide some margin
  404. var left = ( pageWidth - slideWidth ) / 2,
  405. top = ( pageHeight - slideHeight ) / 2;
  406. var contentHeight = getAbsoluteHeight( slide );
  407. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  408. // Center slides vertically
  409. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  410. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  411. }
  412. // Position the slide inside of the page
  413. slide.style.left = left + 'px';
  414. slide.style.top = top + 'px';
  415. slide.style.width = slideWidth + 'px';
  416. // TODO Backgrounds need to be multiplied when the slide
  417. // stretches over multiple pages
  418. var background = slide.querySelector( '.slide-background' );
  419. if( background ) {
  420. background.style.width = pageWidth + 'px';
  421. background.style.height = ( pageHeight * numberOfPages ) + 'px';
  422. background.style.top = -top + 'px';
  423. background.style.left = -left + 'px';
  424. }
  425. }
  426. } );
  427. // Show all fragments
  428. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
  429. fragment.classList.add( 'visible' );
  430. } );
  431. }
  432. /**
  433. * Creates an HTML element and returns a reference to it.
  434. * If the element already exists the existing instance will
  435. * be returned.
  436. */
  437. function createSingletonNode( container, tagname, classname, innerHTML ) {
  438. // Find all nodes matching the description
  439. var nodes = container.querySelectorAll( '.' + classname );
  440. // Check all matches to find one which is a direct child of
  441. // the specified container
  442. for( var i = 0; i < nodes.length; i++ ) {
  443. var testNode = nodes[i];
  444. if( testNode.parentNode === container ) {
  445. return testNode;
  446. }
  447. }
  448. // If no node was found, create it now
  449. var node = document.createElement( tagname );
  450. node.classList.add( classname );
  451. if( typeof innerHTML === 'string' ) {
  452. node.innerHTML = innerHTML;
  453. }
  454. container.appendChild( node );
  455. return node;
  456. }
  457. /**
  458. * Creates the slide background elements and appends them
  459. * to the background container. One element is created per
  460. * slide no matter if the given slide has visible background.
  461. */
  462. function createBackgrounds() {
  463. var printMode = isPrintingPDF();
  464. // Clear prior backgrounds
  465. dom.background.innerHTML = '';
  466. dom.background.classList.add( 'no-transition' );
  467. // Iterate over all horizontal slides
  468. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  469. var backgroundStack;
  470. if( printMode ) {
  471. backgroundStack = createBackground( slideh, slideh );
  472. }
  473. else {
  474. backgroundStack = createBackground( slideh, dom.background );
  475. }
  476. // Iterate over all vertical slides
  477. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  478. if( printMode ) {
  479. createBackground( slidev, slidev );
  480. }
  481. else {
  482. createBackground( slidev, backgroundStack );
  483. }
  484. backgroundStack.classList.add( 'stack' );
  485. } );
  486. } );
  487. // Add parallax background if specified
  488. if( config.parallaxBackgroundImage ) {
  489. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  490. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  491. // Make sure the below properties are set on the element - these properties are
  492. // needed for proper transitions to be set on the element via CSS. To remove
  493. // annoying background slide-in effect when the presentation starts, apply
  494. // these properties after short time delay
  495. setTimeout( function() {
  496. dom.wrapper.classList.add( 'has-parallax-background' );
  497. }, 1 );
  498. }
  499. else {
  500. dom.background.style.backgroundImage = '';
  501. dom.wrapper.classList.remove( 'has-parallax-background' );
  502. }
  503. }
  504. /**
  505. * Creates a background for the given slide.
  506. *
  507. * @param {HTMLElement} slide
  508. * @param {HTMLElement} container The element that the background
  509. * should be appended to
  510. */
  511. function createBackground( slide, container ) {
  512. var data = {
  513. background: slide.getAttribute( 'data-background' ),
  514. backgroundSize: slide.getAttribute( 'data-background-size' ),
  515. backgroundImage: slide.getAttribute( 'data-background-image' ),
  516. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  517. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  518. backgroundColor: slide.getAttribute( 'data-background-color' ),
  519. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  520. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  521. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  522. };
  523. var element = document.createElement( 'div' );
  524. // Carry over custom classes from the slide to the background
  525. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  526. if( data.background ) {
  527. // Auto-wrap image urls in url(...)
  528. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
  529. slide.setAttribute( 'data-background-image', data.background );
  530. }
  531. else {
  532. element.style.background = data.background;
  533. }
  534. }
  535. // Create a hash for this combination of background settings.
  536. // This is used to determine when two slide backgrounds are
  537. // the same.
  538. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  539. element.setAttribute( 'data-background-hash', data.background +
  540. data.backgroundSize +
  541. data.backgroundImage +
  542. data.backgroundVideo +
  543. data.backgroundIframe +
  544. data.backgroundColor +
  545. data.backgroundRepeat +
  546. data.backgroundPosition +
  547. data.backgroundTransition );
  548. }
  549. // Additional and optional background properties
  550. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  551. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  552. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  553. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  554. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  555. container.appendChild( element );
  556. // If backgrounds are being recreated, clear old classes
  557. slide.classList.remove( 'has-dark-background' );
  558. slide.classList.remove( 'has-light-background' );
  559. // If this slide has a background color, add a class that
  560. // signals if it is light or dark. If the slide has no background
  561. // color, no class will be set
  562. var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor;
  563. if( computedBackgroundColor ) {
  564. var rgb = colorToRgb( computedBackgroundColor );
  565. // Ignore fully transparent backgrounds. Some browsers return
  566. // rgba(0,0,0,0) when reading the computed background color of
  567. // an element with no background
  568. if( rgb && rgb.a !== 0 ) {
  569. if( colorBrightness( computedBackgroundColor ) < 128 ) {
  570. slide.classList.add( 'has-dark-background' );
  571. }
  572. else {
  573. slide.classList.add( 'has-light-background' );
  574. }
  575. }
  576. }
  577. return element;
  578. }
  579. /**
  580. * Registers a listener to postMessage events, this makes it
  581. * possible to call all reveal.js API methods from another
  582. * window. For example:
  583. *
  584. * revealWindow.postMessage( JSON.stringify({
  585. * method: 'slide',
  586. * args: [ 2 ]
  587. * }), '*' );
  588. */
  589. function setupPostMessage() {
  590. if( config.postMessage ) {
  591. window.addEventListener( 'message', function ( event ) {
  592. var data = event.data;
  593. // Make sure we're dealing with JSON
  594. if( data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  595. data = JSON.parse( data );
  596. // Check if the requested method can be found
  597. if( data.method && typeof Reveal[data.method] === 'function' ) {
  598. Reveal[data.method].apply( Reveal, data.args );
  599. }
  600. }
  601. }, false );
  602. }
  603. }
  604. /**
  605. * Applies the configuration settings from the config
  606. * object. May be called multiple times.
  607. */
  608. function configure( options ) {
  609. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  610. dom.wrapper.classList.remove( config.transition );
  611. // New config options may be passed when this method
  612. // is invoked through the API after initialization
  613. if( typeof options === 'object' ) extend( config, options );
  614. // Force linear transition based on browser capabilities
  615. if( features.transforms3d === false ) config.transition = 'linear';
  616. dom.wrapper.classList.add( config.transition );
  617. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  618. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  619. dom.controls.style.display = config.controls ? 'block' : 'none';
  620. dom.progress.style.display = config.progress ? 'block' : 'none';
  621. if( config.rtl ) {
  622. dom.wrapper.classList.add( 'rtl' );
  623. }
  624. else {
  625. dom.wrapper.classList.remove( 'rtl' );
  626. }
  627. if( config.center ) {
  628. dom.wrapper.classList.add( 'center' );
  629. }
  630. else {
  631. dom.wrapper.classList.remove( 'center' );
  632. }
  633. // Exit the paused mode if it was configured off
  634. if( config.pause === false ) {
  635. resume();
  636. }
  637. if( config.mouseWheel ) {
  638. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  639. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  640. }
  641. else {
  642. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  643. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  644. }
  645. // Rolling 3D links
  646. if( config.rollingLinks ) {
  647. enableRollingLinks();
  648. }
  649. else {
  650. disableRollingLinks();
  651. }
  652. // Iframe link previews
  653. if( config.previewLinks ) {
  654. enablePreviewLinks();
  655. }
  656. else {
  657. disablePreviewLinks();
  658. enablePreviewLinks( '[data-preview-link]' );
  659. }
  660. // Remove existing auto-slide controls
  661. if( autoSlidePlayer ) {
  662. autoSlidePlayer.destroy();
  663. autoSlidePlayer = null;
  664. }
  665. // Generate auto-slide controls if needed
  666. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  667. autoSlidePlayer = new Playback( dom.wrapper, function() {
  668. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  669. } );
  670. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  671. autoSlidePaused = false;
  672. }
  673. // When fragments are turned off they should be visible
  674. if( config.fragments === false ) {
  675. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  676. element.classList.add( 'visible' );
  677. element.classList.remove( 'current-fragment' );
  678. } );
  679. }
  680. sync();
  681. }
  682. /**
  683. * Binds all event listeners.
  684. */
  685. function addEventListeners() {
  686. eventsAreBound = true;
  687. window.addEventListener( 'hashchange', onWindowHashChange, false );
  688. window.addEventListener( 'resize', onWindowResize, false );
  689. if( config.touch ) {
  690. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  691. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  692. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  693. // Support pointer-style touch interaction as well
  694. if( window.navigator.pointerEnabled ) {
  695. // IE 11 uses un-prefixed version of pointer events
  696. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  697. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  698. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  699. }
  700. else if( window.navigator.msPointerEnabled ) {
  701. // IE 10 uses prefixed version of pointer events
  702. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  703. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  704. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  705. }
  706. }
  707. if( config.keyboard ) {
  708. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  709. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  710. }
  711. if( config.progress && dom.progress ) {
  712. dom.progress.addEventListener( 'click', onProgressClicked, false );
  713. }
  714. if( config.focusBodyOnPageVisibilityChange ) {
  715. var visibilityChange;
  716. if( 'hidden' in document ) {
  717. visibilityChange = 'visibilitychange';
  718. }
  719. else if( 'msHidden' in document ) {
  720. visibilityChange = 'msvisibilitychange';
  721. }
  722. else if( 'webkitHidden' in document ) {
  723. visibilityChange = 'webkitvisibilitychange';
  724. }
  725. if( visibilityChange ) {
  726. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  727. }
  728. }
  729. // Listen to both touch and click events, in case the device
  730. // supports both
  731. var pointerEvents = [ 'touchstart', 'click' ];
  732. // Only support touch for Android, fixes double navigations in
  733. // stock browser
  734. if( navigator.userAgent.match( /android/gi ) ) {
  735. pointerEvents = [ 'touchstart' ];
  736. }
  737. pointerEvents.forEach( function( eventName ) {
  738. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  739. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  740. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  741. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  742. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  743. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  744. } );
  745. }
  746. /**
  747. * Unbinds all event listeners.
  748. */
  749. function removeEventListeners() {
  750. eventsAreBound = false;
  751. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  752. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  753. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  754. window.removeEventListener( 'resize', onWindowResize, false );
  755. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  756. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  757. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  758. // IE11
  759. if( window.navigator.pointerEnabled ) {
  760. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  761. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  762. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  763. }
  764. // IE10
  765. else if( window.navigator.msPointerEnabled ) {
  766. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  767. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  768. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  769. }
  770. if ( config.progress && dom.progress ) {
  771. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  772. }
  773. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  774. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  775. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  776. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  777. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  778. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  779. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  780. } );
  781. }
  782. /**
  783. * Extend object a with the properties of object b.
  784. * If there's a conflict, object b takes precedence.
  785. */
  786. function extend( a, b ) {
  787. for( var i in b ) {
  788. a[ i ] = b[ i ];
  789. }
  790. }
  791. /**
  792. * Converts the target object to an array.
  793. */
  794. function toArray( o ) {
  795. return Array.prototype.slice.call( o );
  796. }
  797. /**
  798. * Utility for deserializing a value.
  799. */
  800. function deserialize( value ) {
  801. if( typeof value === 'string' ) {
  802. if( value === 'null' ) return null;
  803. else if( value === 'true' ) return true;
  804. else if( value === 'false' ) return false;
  805. else if( value.match( /^\d+$/ ) ) return parseFloat( value );
  806. }
  807. return value;
  808. }
  809. /**
  810. * Measures the distance in pixels between point a
  811. * and point b.
  812. *
  813. * @param {Object} a point with x/y properties
  814. * @param {Object} b point with x/y properties
  815. */
  816. function distanceBetween( a, b ) {
  817. var dx = a.x - b.x,
  818. dy = a.y - b.y;
  819. return Math.sqrt( dx*dx + dy*dy );
  820. }
  821. /**
  822. * Applies a CSS transform to the target element.
  823. */
  824. function transformElement( element, transform ) {
  825. element.style.WebkitTransform = transform;
  826. element.style.MozTransform = transform;
  827. element.style.msTransform = transform;
  828. element.style.transform = transform;
  829. }
  830. function transformSlides() {
  831. transformElement( dom.slides, layoutTransform ? layoutTransform + ' ' + slidesTransform : slidesTransform );
  832. }
  833. /**
  834. * Injects the given CSS styles into the DOM.
  835. */
  836. function injectStyleSheet( value ) {
  837. var tag = document.createElement( 'style' );
  838. tag.type = 'text/css';
  839. if( tag.styleSheet ) {
  840. tag.styleSheet.cssText = value;
  841. }
  842. else {
  843. tag.appendChild( document.createTextNode( value ) );
  844. }
  845. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  846. }
  847. /**
  848. * Measures the distance in pixels between point a and point b.
  849. *
  850. * @param {String} color The string representation of a color,
  851. * the following formats are supported:
  852. * - #000
  853. * - #000000
  854. * - rgb(0,0,0)
  855. */
  856. function colorToRgb( color ) {
  857. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  858. if( hex3 && hex3[1] ) {
  859. hex3 = hex3[1];
  860. return {
  861. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  862. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  863. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  864. };
  865. }
  866. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  867. if( hex6 && hex6[1] ) {
  868. hex6 = hex6[1];
  869. return {
  870. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  871. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  872. b: parseInt( hex6.substr( 4, 2 ), 16 )
  873. };
  874. }
  875. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  876. if( rgb ) {
  877. return {
  878. r: parseInt( rgb[1], 10 ),
  879. g: parseInt( rgb[2], 10 ),
  880. b: parseInt( rgb[3], 10 )
  881. };
  882. }
  883. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  884. if( rgba ) {
  885. return {
  886. r: parseInt( rgba[1], 10 ),
  887. g: parseInt( rgba[2], 10 ),
  888. b: parseInt( rgba[3], 10 ),
  889. a: parseFloat( rgba[4] )
  890. };
  891. }
  892. return null;
  893. }
  894. /**
  895. * Calculates brightness on a scale of 0-255.
  896. *
  897. * @param color See colorStringToRgb for supported formats.
  898. */
  899. function colorBrightness( color ) {
  900. if( typeof color === 'string' ) color = colorToRgb( color );
  901. if( color ) {
  902. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  903. }
  904. return null;
  905. }
  906. /**
  907. * Retrieves the height of the given element by looking
  908. * at the position and height of its immediate children.
  909. */
  910. function getAbsoluteHeight( element ) {
  911. var height = 0;
  912. if( element ) {
  913. var absoluteChildren = 0;
  914. toArray( element.childNodes ).forEach( function( child ) {
  915. if( typeof child.offsetTop === 'number' && child.style ) {
  916. // Count # of abs children
  917. if( window.getComputedStyle( child ).position === 'absolute' ) {
  918. absoluteChildren += 1;
  919. }
  920. height = Math.max( height, child.offsetTop + child.offsetHeight );
  921. }
  922. } );
  923. // If there are no absolute children, use offsetHeight
  924. if( absoluteChildren === 0 ) {
  925. height = element.offsetHeight;
  926. }
  927. }
  928. return height;
  929. }
  930. /**
  931. * Returns the remaining height within the parent of the
  932. * target element.
  933. *
  934. * remaining height = [ configured parent height ] - [ current parent height ]
  935. */
  936. function getRemainingHeight( element, height ) {
  937. height = height || 0;
  938. if( element ) {
  939. var newHeight, oldHeight = element.style.height;
  940. // Change the .stretch element height to 0 in order find the height of all
  941. // the other elements
  942. element.style.height = '0px';
  943. newHeight = height - element.parentNode.offsetHeight;
  944. // Restore the old height, just in case
  945. element.style.height = oldHeight + 'px';
  946. return newHeight;
  947. }
  948. return height;
  949. }
  950. /**
  951. * Checks if this instance is being used to print a PDF.
  952. */
  953. function isPrintingPDF() {
  954. return ( /print-pdf/gi ).test( window.location.search );
  955. }
  956. /**
  957. * Hides the address bar if we're on a mobile device.
  958. */
  959. function hideAddressBar() {
  960. if( config.hideAddressBar && isMobileDevice ) {
  961. // Events that should trigger the address bar to hide
  962. window.addEventListener( 'load', removeAddressBar, false );
  963. window.addEventListener( 'orientationchange', removeAddressBar, false );
  964. }
  965. }
  966. /**
  967. * Causes the address bar to hide on mobile devices,
  968. * more vertical space ftw.
  969. */
  970. function removeAddressBar() {
  971. setTimeout( function() {
  972. window.scrollTo( 0, 1 );
  973. }, 10 );
  974. }
  975. /**
  976. * Dispatches an event of the specified type from the
  977. * reveal DOM element.
  978. */
  979. function dispatchEvent( type, args ) {
  980. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  981. event.initEvent( type, true, true );
  982. extend( event, args );
  983. dom.wrapper.dispatchEvent( event );
  984. // If we're in an iframe, post each reveal.js event to the
  985. // parent window. Used by the notes plugin
  986. if( config.postMessageEvents && window.parent !== window.self ) {
  987. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  988. }
  989. }
  990. /**
  991. * Wrap all links in 3D goodness.
  992. */
  993. function enableRollingLinks() {
  994. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  995. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  996. for( var i = 0, len = anchors.length; i < len; i++ ) {
  997. var anchor = anchors[i];
  998. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  999. var span = document.createElement('span');
  1000. span.setAttribute('data-title', anchor.text);
  1001. span.innerHTML = anchor.innerHTML;
  1002. anchor.classList.add( 'roll' );
  1003. anchor.innerHTML = '';
  1004. anchor.appendChild(span);
  1005. }
  1006. }
  1007. }
  1008. }
  1009. /**
  1010. * Unwrap all 3D links.
  1011. */
  1012. function disableRollingLinks() {
  1013. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1014. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1015. var anchor = anchors[i];
  1016. var span = anchor.querySelector( 'span' );
  1017. if( span ) {
  1018. anchor.classList.remove( 'roll' );
  1019. anchor.innerHTML = span.innerHTML;
  1020. }
  1021. }
  1022. }
  1023. /**
  1024. * Bind preview frame links.
  1025. */
  1026. function enablePreviewLinks( selector ) {
  1027. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1028. anchors.forEach( function( element ) {
  1029. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1030. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1031. }
  1032. } );
  1033. }
  1034. /**
  1035. * Unbind preview frame links.
  1036. */
  1037. function disablePreviewLinks() {
  1038. var anchors = toArray( document.querySelectorAll( 'a' ) );
  1039. anchors.forEach( function( element ) {
  1040. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1041. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1042. }
  1043. } );
  1044. }
  1045. /**
  1046. * Opens a preview window for the target URL.
  1047. */
  1048. function showPreview( url ) {
  1049. closeOverlay();
  1050. dom.overlay = document.createElement( 'div' );
  1051. dom.overlay.classList.add( 'overlay' );
  1052. dom.overlay.classList.add( 'overlay-preview' );
  1053. dom.wrapper.appendChild( dom.overlay );
  1054. dom.overlay.innerHTML = [
  1055. '<header>',
  1056. '<a class="close" href="#"><span class="icon"></span></a>',
  1057. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1058. '</header>',
  1059. '<div class="spinner"></div>',
  1060. '<div class="viewport">',
  1061. '<iframe src="'+ url +'"></iframe>',
  1062. '</div>'
  1063. ].join('');
  1064. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1065. dom.overlay.classList.add( 'loaded' );
  1066. }, false );
  1067. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1068. closeOverlay();
  1069. event.preventDefault();
  1070. }, false );
  1071. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1072. closeOverlay();
  1073. }, false );
  1074. setTimeout( function() {
  1075. dom.overlay.classList.add( 'visible' );
  1076. }, 1 );
  1077. }
  1078. /**
  1079. * Opens a overlay window with help material.
  1080. */
  1081. function showHelp() {
  1082. if( config.help ) {
  1083. closeOverlay();
  1084. dom.overlay = document.createElement( 'div' );
  1085. dom.overlay.classList.add( 'overlay' );
  1086. dom.overlay.classList.add( 'overlay-help' );
  1087. dom.wrapper.appendChild( dom.overlay );
  1088. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1089. html += '<table><th>KEY</th><th>ACTION</th>';
  1090. for( var key in keyboardShortcuts ) {
  1091. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1092. }
  1093. html += '</table>';
  1094. dom.overlay.innerHTML = [
  1095. '<header>',
  1096. '<a class="close" href="#"><span class="icon"></span></a>',
  1097. '</header>',
  1098. '<div class="viewport">',
  1099. '<div class="viewport-inner">'+ html +'</div>',
  1100. '</div>'
  1101. ].join('');
  1102. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1103. closeOverlay();
  1104. event.preventDefault();
  1105. }, false );
  1106. setTimeout( function() {
  1107. dom.overlay.classList.add( 'visible' );
  1108. }, 1 );
  1109. }
  1110. }
  1111. /**
  1112. * Closes any currently open overlay.
  1113. */
  1114. function closeOverlay() {
  1115. if( dom.overlay ) {
  1116. dom.overlay.parentNode.removeChild( dom.overlay );
  1117. dom.overlay = null;
  1118. }
  1119. }
  1120. /**
  1121. * Applies JavaScript-controlled layout rules to the
  1122. * presentation.
  1123. */
  1124. function layout() {
  1125. if( dom.wrapper && !isPrintingPDF() ) {
  1126. var size = getComputedSlideSize();
  1127. var slidePadding = 20; // TODO Dig this out of DOM
  1128. // Layout the contents of the slides
  1129. layoutSlideContents( config.width, config.height, slidePadding );
  1130. dom.slides.style.width = size.width + 'px';
  1131. dom.slides.style.height = size.height + 'px';
  1132. // Determine scale of content to fit within available space
  1133. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1134. // Respect max/min scale settings
  1135. scale = Math.max( scale, config.minScale );
  1136. scale = Math.min( scale, config.maxScale );
  1137. // Don't apply any scaling styles if scale is 1
  1138. if( scale === 1 ) {
  1139. dom.slides.style.zoom = '';
  1140. dom.slides.style.left = '';
  1141. dom.slides.style.top = '';
  1142. dom.slides.style.bottom = '';
  1143. dom.slides.style.right = '';
  1144. layoutTransform = '';
  1145. }
  1146. else {
  1147. // Prefer zooming in desktop Chrome so that content remains crisp
  1148. if( !isMobileDevice && /chrome/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) {
  1149. dom.slides.style.zoom = scale;
  1150. }
  1151. // Apply scale transform as a fallback
  1152. else {
  1153. dom.slides.style.left = '50%';
  1154. dom.slides.style.top = '50%';
  1155. dom.slides.style.bottom = 'auto';
  1156. dom.slides.style.right = 'auto';
  1157. layoutTransform = 'translate(-50%, -50%) scale('+ scale +')';
  1158. }
  1159. }
  1160. transformSlides();
  1161. // Select all slides, vertical and horizontal
  1162. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1163. for( var i = 0, len = slides.length; i < len; i++ ) {
  1164. var slide = slides[ i ];
  1165. // Don't bother updating invisible slides
  1166. if( slide.style.display === 'none' ) {
  1167. continue;
  1168. }
  1169. if( config.center || slide.classList.contains( 'center' ) ) {
  1170. // Vertical stacks are not centred since their section
  1171. // children will be
  1172. if( slide.classList.contains( 'stack' ) ) {
  1173. slide.style.top = 0;
  1174. }
  1175. else {
  1176. slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
  1177. }
  1178. }
  1179. else {
  1180. slide.style.top = '';
  1181. }
  1182. }
  1183. updateProgress();
  1184. updateParallax();
  1185. }
  1186. }
  1187. /**
  1188. * Applies layout logic to the contents of all slides in
  1189. * the presentation.
  1190. */
  1191. function layoutSlideContents( width, height, padding ) {
  1192. // Handle sizing of elements with the 'stretch' class
  1193. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1194. // Determine how much vertical space we can use
  1195. var remainingHeight = getRemainingHeight( element, height );
  1196. // Consider the aspect ratio of media elements
  1197. if( /(img|video)/gi.test( element.nodeName ) ) {
  1198. var nw = element.naturalWidth || element.videoWidth,
  1199. nh = element.naturalHeight || element.videoHeight;
  1200. var es = Math.min( width / nw, remainingHeight / nh );
  1201. element.style.width = ( nw * es ) + 'px';
  1202. element.style.height = ( nh * es ) + 'px';
  1203. }
  1204. else {
  1205. element.style.width = width + 'px';
  1206. element.style.height = remainingHeight + 'px';
  1207. }
  1208. } );
  1209. }
  1210. /**
  1211. * Calculates the computed pixel size of our slides. These
  1212. * values are based on the width and height configuration
  1213. * options.
  1214. */
  1215. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1216. var size = {
  1217. // Slide size
  1218. width: config.width,
  1219. height: config.height,
  1220. // Presentation size
  1221. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1222. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1223. };
  1224. // Reduce available space by margin
  1225. size.presentationWidth -= ( size.presentationHeight * config.margin );
  1226. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1227. // Slide width may be a percentage of available width
  1228. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1229. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1230. }
  1231. // Slide height may be a percentage of available height
  1232. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1233. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1234. }
  1235. return size;
  1236. }
  1237. /**
  1238. * Stores the vertical index of a stack so that the same
  1239. * vertical slide can be selected when navigating to and
  1240. * from the stack.
  1241. *
  1242. * @param {HTMLElement} stack The vertical stack element
  1243. * @param {int} v Index to memorize
  1244. */
  1245. function setPreviousVerticalIndex( stack, v ) {
  1246. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1247. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1248. }
  1249. }
  1250. /**
  1251. * Retrieves the vertical index which was stored using
  1252. * #setPreviousVerticalIndex() or 0 if no previous index
  1253. * exists.
  1254. *
  1255. * @param {HTMLElement} stack The vertical stack element
  1256. */
  1257. function getPreviousVerticalIndex( stack ) {
  1258. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1259. // Prefer manually defined start-indexv
  1260. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1261. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1262. }
  1263. return 0;
  1264. }
  1265. /**
  1266. * Displays the overview of slides (quick nav) by
  1267. * scaling down and arranging all slide elements.
  1268. *
  1269. * Experimental feature, might be dropped if perf
  1270. * can't be improved.
  1271. */
  1272. function activateOverview() {
  1273. // Only proceed if enabled in config
  1274. if( config.overview && !isOverview() ) {
  1275. overview = true;
  1276. dom.wrapper.classList.add( 'overview' );
  1277. dom.wrapper.classList.remove( 'overview-deactivating' );
  1278. setTimeout( function() {
  1279. dom.wrapper.classList.add( 'overview-animated' );
  1280. }, 1 );
  1281. // Don't auto-slide while in overview mode
  1282. cancelAutoSlide();
  1283. var margin = 70;
  1284. var slideWidth = config.width + margin,
  1285. slideHeight = config.height + margin;
  1286. // Move the backgrounds element into the slide container to
  1287. // that the same scaling is applied
  1288. dom.slides.appendChild( dom.background );
  1289. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1290. horizontalBackgrounds = dom.background.childNodes;
  1291. for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
  1292. var hslide = horizontalSlides[i],
  1293. hbackground = horizontalBackgrounds[i],
  1294. hoffset = config.rtl ? -slideWidth : slideWidth;
  1295. var htransform = 'translateX(' + ( i * hoffset ) + 'px)';
  1296. hslide.setAttribute( 'data-index-h', i );
  1297. // Apply CSS transform
  1298. transformElement( hslide, htransform );
  1299. transformElement( hbackground, htransform );
  1300. if( hslide.classList.contains( 'stack' ) ) {
  1301. var verticalSlides = hslide.querySelectorAll( 'section' ),
  1302. verticalBackgrounds = hbackground.querySelectorAll( '.slide-background' );
  1303. for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
  1304. var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );
  1305. var vslide = verticalSlides[j],
  1306. vbackground = verticalBackgrounds[j];
  1307. var vtransform = 'translateY(' + ( j * slideHeight ) + 'px)';
  1308. vslide.setAttribute( 'data-index-h', i );
  1309. vslide.setAttribute( 'data-index-v', j );
  1310. // Apply CSS transform
  1311. transformElement( vslide, vtransform );
  1312. transformElement( vbackground, vtransform );
  1313. // Navigate to this slide on click
  1314. vslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1315. }
  1316. }
  1317. else {
  1318. // Navigate to this slide on click
  1319. hslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1320. }
  1321. }
  1322. updateSlidesVisibility();
  1323. updateOverview();
  1324. layout();
  1325. // Notify observers of the overview showing
  1326. dispatchEvent( 'overviewshown', {
  1327. 'indexh': indexh,
  1328. 'indexv': indexv,
  1329. 'currentSlide': currentSlide
  1330. } );
  1331. }
  1332. }
  1333. function updateOverview() {
  1334. var z = window.innerWidth < 400 ? 1000 : 2500;
  1335. var margin = 70;
  1336. var slideWidth = config.width + margin,
  1337. slideHeight = config.height + margin;
  1338. slidesTransform = [
  1339. 'translateX('+ ( -indexh * slideWidth ) +'px)',
  1340. 'translateY('+ ( -indexv * slideHeight ) +'px)',
  1341. 'translateZ('+ ( -z ) +'px)'
  1342. ].join( ' ' );
  1343. transformSlides();
  1344. }
  1345. /**
  1346. * Exits the slide overview and enters the currently
  1347. * active slide.
  1348. */
  1349. function deactivateOverview() {
  1350. // Only proceed if enabled in config
  1351. if( config.overview ) {
  1352. slidesTransform = '';
  1353. overview = false;
  1354. dom.wrapper.classList.remove( 'overview' );
  1355. // Move the background element back out
  1356. dom.wrapper.appendChild( dom.background );
  1357. dom.wrapper.classList.remove( 'overview-animated' );
  1358. // Temporarily add a class so that transitions can do different things
  1359. // depending on whether they are exiting/entering overview, or just
  1360. // moving from slide to slide
  1361. dom.wrapper.classList.add( 'overview-deactivating' );
  1362. setTimeout( function () {
  1363. dom.wrapper.classList.remove( 'overview-deactivating' );
  1364. }, 1 );
  1365. // Clean up changes made to slides
  1366. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1367. transformElement( slide, '' );
  1368. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1369. } );
  1370. // Clean up changes made to backgrounds
  1371. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  1372. transformElement( background, '' );
  1373. } );
  1374. slide( indexh, indexv );
  1375. layout();
  1376. cueAutoSlide();
  1377. // Notify observers of the overview hiding
  1378. dispatchEvent( 'overviewhidden', {
  1379. 'indexh': indexh,
  1380. 'indexv': indexv,
  1381. 'currentSlide': currentSlide
  1382. } );
  1383. }
  1384. }
  1385. /**
  1386. * Toggles the slide overview mode on and off.
  1387. *
  1388. * @param {Boolean} override Optional flag which overrides the
  1389. * toggle logic and forcibly sets the desired state. True means
  1390. * overview is open, false means it's closed.
  1391. */
  1392. function toggleOverview( override ) {
  1393. if( typeof override === 'boolean' ) {
  1394. override ? activateOverview() : deactivateOverview();
  1395. }
  1396. else {
  1397. isOverview() ? deactivateOverview() : activateOverview();
  1398. }
  1399. }
  1400. /**
  1401. * Checks if the overview is currently active.
  1402. *
  1403. * @return {Boolean} true if the overview is active,
  1404. * false otherwise
  1405. */
  1406. function isOverview() {
  1407. return overview;
  1408. }
  1409. /**
  1410. * Checks if the current or specified slide is vertical
  1411. * (nested within another slide).
  1412. *
  1413. * @param {HTMLElement} slide [optional] The slide to check
  1414. * orientation of
  1415. */
  1416. function isVerticalSlide( slide ) {
  1417. // Prefer slide argument, otherwise use current slide
  1418. slide = slide ? slide : currentSlide;
  1419. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1420. }
  1421. /**
  1422. * Handling the fullscreen functionality via the fullscreen API
  1423. *
  1424. * @see http://fullscreen.spec.whatwg.org/
  1425. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1426. */
  1427. function enterFullscreen() {
  1428. var element = document.body;
  1429. // Check which implementation is available
  1430. var requestMethod = element.requestFullScreen ||
  1431. element.webkitRequestFullscreen ||
  1432. element.webkitRequestFullScreen ||
  1433. element.mozRequestFullScreen ||
  1434. element.msRequestFullscreen;
  1435. if( requestMethod ) {
  1436. requestMethod.apply( element );
  1437. }
  1438. }
  1439. /**
  1440. * Enters the paused mode which fades everything on screen to
  1441. * black.
  1442. */
  1443. function pause() {
  1444. if( config.pause ) {
  1445. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1446. cancelAutoSlide();
  1447. dom.wrapper.classList.add( 'paused' );
  1448. if( wasPaused === false ) {
  1449. dispatchEvent( 'paused' );
  1450. }
  1451. }
  1452. }
  1453. /**
  1454. * Exits from the paused mode.
  1455. */
  1456. function resume() {
  1457. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1458. dom.wrapper.classList.remove( 'paused' );
  1459. cueAutoSlide();
  1460. if( wasPaused ) {
  1461. dispatchEvent( 'resumed' );
  1462. }
  1463. }
  1464. /**
  1465. * Toggles the paused mode on and off.
  1466. */
  1467. function togglePause( override ) {
  1468. if( typeof override === 'boolean' ) {
  1469. override ? pause() : resume();
  1470. }
  1471. else {
  1472. isPaused() ? resume() : pause();
  1473. }
  1474. }
  1475. /**
  1476. * Checks if we are currently in the paused mode.
  1477. */
  1478. function isPaused() {
  1479. return dom.wrapper.classList.contains( 'paused' );
  1480. }
  1481. /**
  1482. * Toggles the auto slide mode on and off.
  1483. *
  1484. * @param {Boolean} override Optional flag which sets the desired state.
  1485. * True means autoplay starts, false means it stops.
  1486. */
  1487. function toggleAutoSlide( override ) {
  1488. if( typeof override === 'boolean' ) {
  1489. override ? resumeAutoSlide() : pauseAutoSlide();
  1490. }
  1491. else {
  1492. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  1493. }
  1494. }
  1495. /**
  1496. * Checks if the auto slide mode is currently on.
  1497. */
  1498. function isAutoSliding() {
  1499. return !!( autoSlide && !autoSlidePaused );
  1500. }
  1501. /**
  1502. * Steps from the current point in the presentation to the
  1503. * slide which matches the specified horizontal and vertical
  1504. * indices.
  1505. *
  1506. * @param {int} h Horizontal index of the target slide
  1507. * @param {int} v Vertical index of the target slide
  1508. * @param {int} f Optional index of a fragment within the
  1509. * target slide to activate
  1510. * @param {int} o Optional origin for use in multimaster environments
  1511. */
  1512. function slide( h, v, f, o ) {
  1513. // Remember where we were at before
  1514. previousSlide = currentSlide;
  1515. // Query all horizontal slides in the deck
  1516. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1517. // If no vertical index is specified and the upcoming slide is a
  1518. // stack, resume at its previous vertical index
  1519. if( v === undefined ) {
  1520. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1521. }
  1522. // If we were on a vertical stack, remember what vertical index
  1523. // it was on so we can resume at the same position when returning
  1524. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1525. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1526. }
  1527. // Remember the state before this slide
  1528. var stateBefore = state.concat();
  1529. // Reset the state array
  1530. state.length = 0;
  1531. var indexhBefore = indexh || 0,
  1532. indexvBefore = indexv || 0;
  1533. // Activate and transition to the new slide
  1534. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1535. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1536. // Update the visibility of slides now that the indices have changed
  1537. updateSlidesVisibility();
  1538. layout();
  1539. // Apply the new state
  1540. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1541. // Check if this state existed on the previous slide. If it
  1542. // did, we will avoid adding it repeatedly
  1543. for( var j = 0; j < stateBefore.length; j++ ) {
  1544. if( stateBefore[j] === state[i] ) {
  1545. stateBefore.splice( j, 1 );
  1546. continue stateLoop;
  1547. }
  1548. }
  1549. document.documentElement.classList.add( state[i] );
  1550. // Dispatch custom event matching the state's name
  1551. dispatchEvent( state[i] );
  1552. }
  1553. // Clean up the remains of the previous state
  1554. while( stateBefore.length ) {
  1555. document.documentElement.classList.remove( stateBefore.pop() );
  1556. }
  1557. // If the overview is active, re-activate it to update positions
  1558. if( isOverview() ) {
  1559. updateOverview();
  1560. }
  1561. // Find the current horizontal slide and any possible vertical slides
  1562. // within it
  1563. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1564. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1565. // Store references to the previous and current slides
  1566. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1567. // Show fragment, if specified
  1568. if( typeof f !== 'undefined' ) {
  1569. navigateFragment( f );
  1570. }
  1571. // Dispatch an event if the slide changed
  1572. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1573. if( slideChanged ) {
  1574. dispatchEvent( 'slidechanged', {
  1575. 'indexh': indexh,
  1576. 'indexv': indexv,
  1577. 'previousSlide': previousSlide,
  1578. 'currentSlide': currentSlide,
  1579. 'origin': o
  1580. } );
  1581. }
  1582. else {
  1583. // Ensure that the previous slide is never the same as the current
  1584. previousSlide = null;
  1585. }
  1586. // Solves an edge case where the previous slide maintains the
  1587. // 'present' class when navigating between adjacent vertical
  1588. // stacks
  1589. if( previousSlide ) {
  1590. previousSlide.classList.remove( 'present' );
  1591. previousSlide.setAttribute( 'aria-hidden', 'true' );
  1592. // Reset all slides upon navigate to home
  1593. // Issue: #285
  1594. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1595. // Launch async task
  1596. setTimeout( function () {
  1597. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1598. for( i in slides ) {
  1599. if( slides[i] ) {
  1600. // Reset stack
  1601. setPreviousVerticalIndex( slides[i], 0 );
  1602. }
  1603. }
  1604. }, 0 );
  1605. }
  1606. }
  1607. // Handle embedded content
  1608. if( slideChanged || !previousSlide ) {
  1609. stopEmbeddedContent( previousSlide );
  1610. startEmbeddedContent( currentSlide );
  1611. }
  1612. // Announce the current slide contents, for screen readers
  1613. dom.statusDiv.textContent = currentSlide.textContent;
  1614. updateControls();
  1615. updateProgress();
  1616. updateBackground();
  1617. updateParallax();
  1618. updateSlideNumber();
  1619. // Update the URL hash
  1620. writeURL();
  1621. cueAutoSlide();
  1622. }
  1623. /**
  1624. * Syncs the presentation with the current DOM. Useful
  1625. * when new slides or control elements are added or when
  1626. * the configuration has changed.
  1627. */
  1628. function sync() {
  1629. // Subscribe to input
  1630. removeEventListeners();
  1631. addEventListeners();
  1632. // Force a layout to make sure the current config is accounted for
  1633. layout();
  1634. // Reflect the current autoSlide value
  1635. autoSlide = config.autoSlide;
  1636. // Start auto-sliding if it's enabled
  1637. cueAutoSlide();
  1638. // Re-create the slide backgrounds
  1639. createBackgrounds();
  1640. // Write the current hash to the URL
  1641. writeURL();
  1642. sortAllFragments();
  1643. updateControls();
  1644. updateProgress();
  1645. updateBackground( true );
  1646. updateSlideNumber();
  1647. updateSlidesVisibility();
  1648. formatEmbeddedContent();
  1649. }
  1650. /**
  1651. * Resets all vertical slides so that only the first
  1652. * is visible.
  1653. */
  1654. function resetVerticalSlides() {
  1655. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1656. horizontalSlides.forEach( function( horizontalSlide ) {
  1657. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1658. verticalSlides.forEach( function( verticalSlide, y ) {
  1659. if( y > 0 ) {
  1660. verticalSlide.classList.remove( 'present' );
  1661. verticalSlide.classList.remove( 'past' );
  1662. verticalSlide.classList.add( 'future' );
  1663. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  1664. }
  1665. } );
  1666. } );
  1667. }
  1668. /**
  1669. * Sorts and formats all of fragments in the
  1670. * presentation.
  1671. */
  1672. function sortAllFragments() {
  1673. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1674. horizontalSlides.forEach( function( horizontalSlide ) {
  1675. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1676. verticalSlides.forEach( function( verticalSlide, y ) {
  1677. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  1678. } );
  1679. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  1680. } );
  1681. }
  1682. /**
  1683. * Updates one dimension of slides by showing the slide
  1684. * with the specified index.
  1685. *
  1686. * @param {String} selector A CSS selector that will fetch
  1687. * the group of slides we are working with
  1688. * @param {Number} index The index of the slide that should be
  1689. * shown
  1690. *
  1691. * @return {Number} The index of the slide that is now shown,
  1692. * might differ from the passed in index if it was out of
  1693. * bounds.
  1694. */
  1695. function updateSlides( selector, index ) {
  1696. // Select all slides and convert the NodeList result to
  1697. // an array
  1698. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  1699. slidesLength = slides.length;
  1700. var printMode = isPrintingPDF();
  1701. if( slidesLength ) {
  1702. // Should the index loop?
  1703. if( config.loop ) {
  1704. index %= slidesLength;
  1705. if( index < 0 ) {
  1706. index = slidesLength + index;
  1707. }
  1708. }
  1709. // Enforce max and minimum index bounds
  1710. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1711. for( var i = 0; i < slidesLength; i++ ) {
  1712. var element = slides[i];
  1713. var reverse = config.rtl && !isVerticalSlide( element );
  1714. element.classList.remove( 'past' );
  1715. element.classList.remove( 'present' );
  1716. element.classList.remove( 'future' );
  1717. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1718. element.setAttribute( 'hidden', '' );
  1719. element.setAttribute( 'aria-hidden', 'true' );
  1720. // If this element contains vertical slides
  1721. if( element.querySelector( 'section' ) ) {
  1722. element.classList.add( 'stack' );
  1723. }
  1724. // If we're printing static slides, all slides are "present"
  1725. if( printMode ) {
  1726. element.classList.add( 'present' );
  1727. continue;
  1728. }
  1729. if( i < index ) {
  1730. // Any element previous to index is given the 'past' class
  1731. element.classList.add( reverse ? 'future' : 'past' );
  1732. if( config.fragments ) {
  1733. var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
  1734. // Show all fragments on prior slides
  1735. while( pastFragments.length ) {
  1736. var pastFragment = pastFragments.pop();
  1737. pastFragment.classList.add( 'visible' );
  1738. pastFragment.classList.remove( 'current-fragment' );
  1739. }
  1740. }
  1741. }
  1742. else if( i > index ) {
  1743. // Any element subsequent to index is given the 'future' class
  1744. element.classList.add( reverse ? 'past' : 'future' );
  1745. if( config.fragments ) {
  1746. var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1747. // No fragments in future slides should be visible ahead of time
  1748. while( futureFragments.length ) {
  1749. var futureFragment = futureFragments.pop();
  1750. futureFragment.classList.remove( 'visible' );
  1751. futureFragment.classList.remove( 'current-fragment' );
  1752. }
  1753. }
  1754. }
  1755. }
  1756. // Mark the current slide as present
  1757. slides[index].classList.add( 'present' );
  1758. slides[index].removeAttribute( 'hidden' );
  1759. slides[index].removeAttribute( 'aria-hidden' );
  1760. // If this slide has a state associated with it, add it
  1761. // onto the current state of the deck
  1762. var slideState = slides[index].getAttribute( 'data-state' );
  1763. if( slideState ) {
  1764. state = state.concat( slideState.split( ' ' ) );
  1765. }
  1766. }
  1767. else {
  1768. // Since there are no slides we can't be anywhere beyond the
  1769. // zeroth index
  1770. index = 0;
  1771. }
  1772. return index;
  1773. }
  1774. /**
  1775. * Optimization method; hide all slides that are far away
  1776. * from the present slide.
  1777. */
  1778. function updateSlidesVisibility() {
  1779. // Select all slides and convert the NodeList result to
  1780. // an array
  1781. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1782. horizontalSlidesLength = horizontalSlides.length,
  1783. distanceX,
  1784. distanceY;
  1785. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  1786. // The number of steps away from the present slide that will
  1787. // be visible
  1788. var viewDistance = isOverview() ? 7 : config.viewDistance;
  1789. // Limit view distance on weaker devices
  1790. if( isMobileDevice ) {
  1791. viewDistance = isOverview() ? 7 : 2;
  1792. }
  1793. // Limit view distance on weaker devices
  1794. if( isPrintingPDF() ) {
  1795. viewDistance = Number.MAX_VALUE;
  1796. }
  1797. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1798. var horizontalSlide = horizontalSlides[x];
  1799. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1800. verticalSlidesLength = verticalSlides.length;
  1801. // Loops so that it measures 1 between the first and last slides
  1802. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1803. // Show the horizontal slide if it's within the view distance
  1804. if( distanceX < viewDistance ) {
  1805. showSlide( horizontalSlide );
  1806. }
  1807. else {
  1808. hideSlide( horizontalSlide );
  1809. }
  1810. if( verticalSlidesLength ) {
  1811. var oy = getPreviousVerticalIndex( horizontalSlide );
  1812. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1813. var verticalSlide = verticalSlides[y];
  1814. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  1815. if( distanceX + distanceY < viewDistance ) {
  1816. showSlide( verticalSlide );
  1817. }
  1818. else {
  1819. hideSlide( verticalSlide );
  1820. }
  1821. }
  1822. }
  1823. }
  1824. }
  1825. }
  1826. /**
  1827. * Updates the progress bar to reflect the current slide.
  1828. */
  1829. function updateProgress() {
  1830. // Update progress if enabled
  1831. if( config.progress && dom.progressbar ) {
  1832. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  1833. }
  1834. }
  1835. /**
  1836. * Updates the slide number div to reflect the current slide.
  1837. *
  1838. * Slide number format can be defined as a string using the
  1839. * following variables:
  1840. * h: current slide's horizontal index
  1841. * v: current slide's vertical index
  1842. * c: current slide index (flattened)
  1843. * t: total number of slides (flattened)
  1844. */
  1845. function updateSlideNumber() {
  1846. // Update slide number if enabled
  1847. if( config.slideNumber && dom.slideNumber) {
  1848. // Default to only showing the current slide number
  1849. var format = 'c';
  1850. // Check if a custom slide number format is available
  1851. if( typeof config.slideNumber === 'string' ) {
  1852. format = config.slideNumber;
  1853. }
  1854. var totalSlides = getTotalSlides();
  1855. dom.slideNumber.innerHTML = format.replace( /h/g, indexh )
  1856. .replace( /v/g, indexv )
  1857. .replace( /c/g, Math.round( getProgress() * totalSlides ) + 1 )
  1858. .replace( /t/g, totalSlides + 1 );
  1859. }
  1860. }
  1861. /**
  1862. * Updates the state of all control/navigation arrows.
  1863. */
  1864. function updateControls() {
  1865. var routes = availableRoutes();
  1866. var fragments = availableFragments();
  1867. // Remove the 'enabled' class from all directions
  1868. dom.controlsLeft.concat( dom.controlsRight )
  1869. .concat( dom.controlsUp )
  1870. .concat( dom.controlsDown )
  1871. .concat( dom.controlsPrev )
  1872. .concat( dom.controlsNext ).forEach( function( node ) {
  1873. node.classList.remove( 'enabled' );
  1874. node.classList.remove( 'fragmented' );
  1875. } );
  1876. // Add the 'enabled' class to the available routes
  1877. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1878. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1879. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1880. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1881. // Prev/next buttons
  1882. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1883. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1884. // Highlight fragment directions
  1885. if( currentSlide ) {
  1886. // Always apply fragment decorator to prev/next buttons
  1887. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1888. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1889. // Apply fragment decorators to directional buttons based on
  1890. // what slide axis they are in
  1891. if( isVerticalSlide( currentSlide ) ) {
  1892. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1893. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1894. }
  1895. else {
  1896. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1897. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1898. }
  1899. }
  1900. }
  1901. /**
  1902. * Updates the background elements to reflect the current
  1903. * slide.
  1904. *
  1905. * @param {Boolean} includeAll If true, the backgrounds of
  1906. * all vertical slides (not just the present) will be updated.
  1907. */
  1908. function updateBackground( includeAll ) {
  1909. var currentBackground = null;
  1910. // Reverse past/future classes when in RTL mode
  1911. var horizontalPast = config.rtl ? 'future' : 'past',
  1912. horizontalFuture = config.rtl ? 'past' : 'future';
  1913. // Update the classes of all backgrounds to match the
  1914. // states of their slides (past/present/future)
  1915. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  1916. backgroundh.classList.remove( 'past' );
  1917. backgroundh.classList.remove( 'present' );
  1918. backgroundh.classList.remove( 'future' );
  1919. if( h < indexh ) {
  1920. backgroundh.classList.add( horizontalPast );
  1921. }
  1922. else if ( h > indexh ) {
  1923. backgroundh.classList.add( horizontalFuture );
  1924. }
  1925. else {
  1926. backgroundh.classList.add( 'present' );
  1927. // Store a reference to the current background element
  1928. currentBackground = backgroundh;
  1929. }
  1930. if( includeAll || h === indexh ) {
  1931. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  1932. backgroundv.classList.remove( 'past' );
  1933. backgroundv.classList.remove( 'present' );
  1934. backgroundv.classList.remove( 'future' );
  1935. if( v < indexv ) {
  1936. backgroundv.classList.add( 'past' );
  1937. }
  1938. else if ( v > indexv ) {
  1939. backgroundv.classList.add( 'future' );
  1940. }
  1941. else {
  1942. backgroundv.classList.add( 'present' );
  1943. // Only if this is the present horizontal and vertical slide
  1944. if( h === indexh ) currentBackground = backgroundv;
  1945. }
  1946. } );
  1947. }
  1948. } );
  1949. // Stop any currently playing video background
  1950. if( previousBackground ) {
  1951. var previousVideo = previousBackground.querySelector( 'video' );
  1952. if( previousVideo ) previousVideo.pause();
  1953. }
  1954. if( currentBackground ) {
  1955. // Start video playback
  1956. var currentVideo = currentBackground.querySelector( 'video' );
  1957. if( currentVideo ) {
  1958. currentVideo.currentTime = 0;
  1959. currentVideo.play();
  1960. }
  1961. // Don't transition between identical backgrounds. This
  1962. // prevents unwanted flicker.
  1963. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  1964. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  1965. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  1966. dom.background.classList.add( 'no-transition' );
  1967. }
  1968. previousBackground = currentBackground;
  1969. }
  1970. // If there's a background brightness flag for this slide,
  1971. // bubble it to the .reveal container
  1972. if( currentSlide ) {
  1973. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  1974. if( currentSlide.classList.contains( classToBubble ) ) {
  1975. dom.wrapper.classList.add( classToBubble );
  1976. }
  1977. else {
  1978. dom.wrapper.classList.remove( classToBubble );
  1979. }
  1980. } );
  1981. }
  1982. // Allow the first background to apply without transition
  1983. setTimeout( function() {
  1984. dom.background.classList.remove( 'no-transition' );
  1985. }, 1 );
  1986. }
  1987. /**
  1988. * Updates the position of the parallax background based
  1989. * on the current slide index.
  1990. */
  1991. function updateParallax() {
  1992. if( config.parallaxBackgroundImage ) {
  1993. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1994. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1995. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  1996. backgroundWidth, backgroundHeight;
  1997. if( backgroundSize.length === 1 ) {
  1998. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  1999. }
  2000. else {
  2001. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2002. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2003. }
  2004. var slideWidth = dom.background.offsetWidth;
  2005. var horizontalSlideCount = horizontalSlides.length;
  2006. var horizontalOffset = -( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) * indexh;
  2007. var slideHeight = dom.background.offsetHeight;
  2008. var verticalSlideCount = verticalSlides.length;
  2009. var verticalOffset = verticalSlideCount > 1 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0;
  2010. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
  2011. }
  2012. }
  2013. /**
  2014. * Called when the given slide is within the configured view
  2015. * distance. Shows the slide element and loads any content
  2016. * that is set to load lazily (data-src).
  2017. */
  2018. function showSlide( slide ) {
  2019. // Show the slide element
  2020. slide.style.display = 'block';
  2021. // Media elements with data-src attributes
  2022. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  2023. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2024. element.removeAttribute( 'data-src' );
  2025. } );
  2026. // Media elements with <source> children
  2027. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2028. var sources = 0;
  2029. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2030. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2031. source.removeAttribute( 'data-src' );
  2032. sources += 1;
  2033. } );
  2034. // If we rewrote sources for this video/audio element, we need
  2035. // to manually tell it to load from its new origin
  2036. if( sources > 0 ) {
  2037. media.load();
  2038. }
  2039. } );
  2040. // Show the corresponding background element
  2041. var indices = getIndices( slide );
  2042. var background = getSlideBackground( indices.h, indices.v );
  2043. if( background ) {
  2044. background.style.display = 'block';
  2045. // If the background contains media, load it
  2046. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2047. background.setAttribute( 'data-loaded', 'true' );
  2048. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2049. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2050. backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2051. // Images
  2052. if( backgroundImage ) {
  2053. background.style.backgroundImage = 'url('+ backgroundImage +')';
  2054. }
  2055. // Videos
  2056. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2057. var video = document.createElement( 'video' );
  2058. // Support comma separated lists of video sources
  2059. backgroundVideo.split( ',' ).forEach( function( source ) {
  2060. video.innerHTML += '<source src="'+ source +'">';
  2061. } );
  2062. background.appendChild( video );
  2063. }
  2064. // Iframes
  2065. else if ( backgroundIframe ) {
  2066. var iframe = document.createElement( 'iframe' );
  2067. iframe.setAttribute( 'src', backgroundIframe );
  2068. iframe.style.width = '100%';
  2069. iframe.style.height = '100%';
  2070. iframe.style.maxHeight = '100%';
  2071. iframe.style.maxWidth = '100%';
  2072. background.appendChild( iframe );
  2073. }
  2074. }
  2075. }
  2076. }
  2077. /**
  2078. * Called when the given slide is moved outside of the
  2079. * configured view distance.
  2080. */
  2081. function hideSlide( slide ) {
  2082. // Hide the slide element
  2083. slide.style.display = 'none';
  2084. // Hide the corresponding background element
  2085. var indices = getIndices( slide );
  2086. var background = getSlideBackground( indices.h, indices.v );
  2087. if( background ) {
  2088. background.style.display = 'none';
  2089. }
  2090. }
  2091. /**
  2092. * Determine what available routes there are for navigation.
  2093. *
  2094. * @return {Object} containing four booleans: left/right/up/down
  2095. */
  2096. function availableRoutes() {
  2097. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2098. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2099. var routes = {
  2100. left: indexh > 0 || config.loop,
  2101. right: indexh < horizontalSlides.length - 1 || config.loop,
  2102. up: indexv > 0,
  2103. down: indexv < verticalSlides.length - 1
  2104. };
  2105. // reverse horizontal controls for rtl
  2106. if( config.rtl ) {
  2107. var left = routes.left;
  2108. routes.left = routes.right;
  2109. routes.right = left;
  2110. }
  2111. return routes;
  2112. }
  2113. /**
  2114. * Returns an object describing the available fragment
  2115. * directions.
  2116. *
  2117. * @return {Object} two boolean properties: prev/next
  2118. */
  2119. function availableFragments() {
  2120. if( currentSlide && config.fragments ) {
  2121. var fragments = currentSlide.querySelectorAll( '.fragment' );
  2122. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  2123. return {
  2124. prev: fragments.length - hiddenFragments.length > 0,
  2125. next: !!hiddenFragments.length
  2126. };
  2127. }
  2128. else {
  2129. return { prev: false, next: false };
  2130. }
  2131. }
  2132. /**
  2133. * Enforces origin-specific format rules for embedded media.
  2134. */
  2135. function formatEmbeddedContent() {
  2136. // YouTube frames must include "?enablejsapi=1"
  2137. toArray( dom.slides.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  2138. var src = el.getAttribute( 'src' );
  2139. if( !/enablejsapi\=1/gi.test( src ) ) {
  2140. el.setAttribute( 'src', src + ( !/\?/.test( src ) ? '?' : '&' ) + 'enablejsapi=1' );
  2141. }
  2142. });
  2143. // Vimeo frames must include "?api=1"
  2144. toArray( dom.slides.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  2145. var src = el.getAttribute( 'src' );
  2146. if( !/api\=1/gi.test( src ) ) {
  2147. el.setAttribute( 'src', src + ( !/\?/.test( src ) ? '?' : '&' ) + 'api=1' );
  2148. }
  2149. });
  2150. }
  2151. /**
  2152. * Start playback of any embedded content inside of
  2153. * the targeted slide.
  2154. */
  2155. function startEmbeddedContent( slide ) {
  2156. if( slide && !isSpeakerNotes() ) {
  2157. // HTML5 media elements
  2158. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2159. if( el.hasAttribute( 'data-autoplay' ) ) {
  2160. el.play();
  2161. }
  2162. } );
  2163. // iframe embeds
  2164. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  2165. el.contentWindow.postMessage( 'slide:start', '*' );
  2166. });
  2167. // YouTube embeds
  2168. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  2169. if( el.hasAttribute( 'data-autoplay' ) ) {
  2170. el.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  2171. }
  2172. });
  2173. // Vimeo embeds
  2174. toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  2175. if( el.hasAttribute( 'data-autoplay' ) ) {
  2176. el.contentWindow.postMessage( '{"method":"play"}', '*' );
  2177. }
  2178. });
  2179. }
  2180. }
  2181. /**
  2182. * Stop playback of any embedded content inside of
  2183. * the targeted slide.
  2184. */
  2185. function stopEmbeddedContent( slide ) {
  2186. if( slide && slide.parentNode ) {
  2187. // HTML5 media elements
  2188. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2189. if( !el.hasAttribute( 'data-ignore' ) ) {
  2190. el.pause();
  2191. }
  2192. } );
  2193. // iframe embeds
  2194. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  2195. el.contentWindow.postMessage( 'slide:stop', '*' );
  2196. });
  2197. // YouTube embeds
  2198. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  2199. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  2200. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  2201. }
  2202. });
  2203. // Vimeo embeds
  2204. toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  2205. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  2206. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  2207. }
  2208. });
  2209. }
  2210. }
  2211. /**
  2212. * Returns a value ranging from 0-1 that represents
  2213. * how far into the presentation we have navigated.
  2214. */
  2215. function getProgress() {
  2216. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2217. // The number of past and total slides
  2218. var totalCount = getTotalSlides();
  2219. var pastCount = 0;
  2220. // Step through all slides and count the past ones
  2221. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  2222. var horizontalSlide = horizontalSlides[i];
  2223. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2224. for( var j = 0; j < verticalSlides.length; j++ ) {
  2225. // Stop as soon as we arrive at the present
  2226. if( verticalSlides[j].classList.contains( 'present' ) ) {
  2227. break mainLoop;
  2228. }
  2229. pastCount++;
  2230. }
  2231. // Stop as soon as we arrive at the present
  2232. if( horizontalSlide.classList.contains( 'present' ) ) {
  2233. break;
  2234. }
  2235. // Don't count the wrapping section for vertical slides
  2236. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  2237. pastCount++;
  2238. }
  2239. }
  2240. if( currentSlide ) {
  2241. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  2242. // If there are fragments in the current slide those should be
  2243. // accounted for in the progress.
  2244. if( allFragments.length > 0 ) {
  2245. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  2246. // This value represents how big a portion of the slide progress
  2247. // that is made up by its fragments (0-1)
  2248. var fragmentWeight = 0.9;
  2249. // Add fragment progress to the past slide count
  2250. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  2251. }
  2252. }
  2253. return pastCount / ( totalCount - 1 );
  2254. }
  2255. /**
  2256. * Checks if this presentation is running inside of the
  2257. * speaker notes window.
  2258. */
  2259. function isSpeakerNotes() {
  2260. return !!window.location.search.match( /receiver/gi );
  2261. }
  2262. /**
  2263. * Reads the current URL (hash) and navigates accordingly.
  2264. */
  2265. function readURL() {
  2266. var hash = window.location.hash;
  2267. // Attempt to parse the hash as either an index or name
  2268. var bits = hash.slice( 2 ).split( '/' ),
  2269. name = hash.replace( /#|\//gi, '' );
  2270. // If the first bit is invalid and there is a name we can
  2271. // assume that this is a named link
  2272. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  2273. var element;
  2274. // Ensure the named link is a valid HTML ID attribute
  2275. if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) {
  2276. // Find the slide with the specified ID
  2277. element = document.getElementById( name );
  2278. }
  2279. if( element ) {
  2280. // Find the position of the named slide and navigate to it
  2281. var indices = Reveal.getIndices( element );
  2282. slide( indices.h, indices.v );
  2283. }
  2284. // If the slide doesn't exist, navigate to the current slide
  2285. else {
  2286. slide( indexh || 0, indexv || 0 );
  2287. }
  2288. }
  2289. else {
  2290. // Read the index components of the hash
  2291. var h = parseInt( bits[0], 10 ) || 0,
  2292. v = parseInt( bits[1], 10 ) || 0;
  2293. if( h !== indexh || v !== indexv ) {
  2294. slide( h, v );
  2295. }
  2296. }
  2297. }
  2298. /**
  2299. * Updates the page URL (hash) to reflect the current
  2300. * state.
  2301. *
  2302. * @param {Number} delay The time in ms to wait before
  2303. * writing the hash
  2304. */
  2305. function writeURL( delay ) {
  2306. if( config.history ) {
  2307. // Make sure there's never more than one timeout running
  2308. clearTimeout( writeURLTimeout );
  2309. // If a delay is specified, timeout this call
  2310. if( typeof delay === 'number' ) {
  2311. writeURLTimeout = setTimeout( writeURL, delay );
  2312. }
  2313. else if( currentSlide ) {
  2314. var url = '/';
  2315. // Attempt to create a named link based on the slide's ID
  2316. var id = currentSlide.getAttribute( 'id' );
  2317. if( id ) {
  2318. id = id.toLowerCase();
  2319. id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
  2320. }
  2321. // If the current slide has an ID, use that as a named link
  2322. if( typeof id === 'string' && id.length ) {
  2323. url = '/' + id;
  2324. }
  2325. // Otherwise use the /h/v index
  2326. else {
  2327. if( indexh > 0 || indexv > 0 ) url += indexh;
  2328. if( indexv > 0 ) url += '/' + indexv;
  2329. }
  2330. window.location.hash = url;
  2331. }
  2332. }
  2333. }
  2334. /**
  2335. * Retrieves the h/v location of the current, or specified,
  2336. * slide.
  2337. *
  2338. * @param {HTMLElement} slide If specified, the returned
  2339. * index will be for this slide rather than the currently
  2340. * active one
  2341. *
  2342. * @return {Object} { h: <int>, v: <int>, f: <int> }
  2343. */
  2344. function getIndices( slide ) {
  2345. // By default, return the current indices
  2346. var h = indexh,
  2347. v = indexv,
  2348. f;
  2349. // If a slide is specified, return the indices of that slide
  2350. if( slide ) {
  2351. var isVertical = isVerticalSlide( slide );
  2352. var slideh = isVertical ? slide.parentNode : slide;
  2353. // Select all horizontal slides
  2354. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2355. // Now that we know which the horizontal slide is, get its index
  2356. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  2357. // Assume we're not vertical
  2358. v = undefined;
  2359. // If this is a vertical slide, grab the vertical index
  2360. if( isVertical ) {
  2361. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  2362. }
  2363. }
  2364. if( !slide && currentSlide ) {
  2365. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  2366. if( hasFragments ) {
  2367. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2368. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  2369. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  2370. }
  2371. else {
  2372. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  2373. }
  2374. }
  2375. }
  2376. return { h: h, v: v, f: f };
  2377. }
  2378. /**
  2379. * Retrieves the total number of slides in this presentation.
  2380. */
  2381. function getTotalSlides() {
  2382. return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  2383. }
  2384. /**
  2385. * Returns the slide element matching the specified index.
  2386. */
  2387. function getSlide( x, y ) {
  2388. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2389. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2390. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  2391. return verticalSlides ? verticalSlides[ y ] : undefined;
  2392. }
  2393. return horizontalSlide;
  2394. }
  2395. /**
  2396. * Returns the background element for the given slide.
  2397. * All slides, even the ones with no background properties
  2398. * defined, have a background element so as long as the
  2399. * index is valid an element will be returned.
  2400. */
  2401. function getSlideBackground( x, y ) {
  2402. // When printing to PDF the slide backgrounds are nested
  2403. // inside of the slides
  2404. if( isPrintingPDF() ) {
  2405. var slide = getSlide( x, y );
  2406. if( slide ) {
  2407. var background = slide.querySelector( '.slide-background' );
  2408. if( background && background.parentNode === slide ) {
  2409. return background;
  2410. }
  2411. }
  2412. return undefined;
  2413. }
  2414. var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
  2415. var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
  2416. if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
  2417. return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
  2418. }
  2419. return horizontalBackground;
  2420. }
  2421. /**
  2422. * Retrieves the current state of the presentation as
  2423. * an object. This state can then be restored at any
  2424. * time.
  2425. */
  2426. function getState() {
  2427. var indices = getIndices();
  2428. return {
  2429. indexh: indices.h,
  2430. indexv: indices.v,
  2431. indexf: indices.f,
  2432. paused: isPaused(),
  2433. overview: isOverview()
  2434. };
  2435. }
  2436. /**
  2437. * Restores the presentation to the given state.
  2438. *
  2439. * @param {Object} state As generated by getState()
  2440. */
  2441. function setState( state ) {
  2442. if( typeof state === 'object' ) {
  2443. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  2444. var pausedFlag = deserialize( state.paused ),
  2445. overviewFlag = deserialize( state.overview );
  2446. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  2447. togglePause( pausedFlag );
  2448. }
  2449. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  2450. toggleOverview( overviewFlag );
  2451. }
  2452. }
  2453. }
  2454. /**
  2455. * Return a sorted fragments list, ordered by an increasing
  2456. * "data-fragment-index" attribute.
  2457. *
  2458. * Fragments will be revealed in the order that they are returned by
  2459. * this function, so you can use the index attributes to control the
  2460. * order of fragment appearance.
  2461. *
  2462. * To maintain a sensible default fragment order, fragments are presumed
  2463. * to be passed in document order. This function adds a "fragment-index"
  2464. * attribute to each node if such an attribute is not already present,
  2465. * and sets that attribute to an integer value which is the position of
  2466. * the fragment within the fragments list.
  2467. */
  2468. function sortFragments( fragments ) {
  2469. fragments = toArray( fragments );
  2470. var ordered = [],
  2471. unordered = [],
  2472. sorted = [];
  2473. // Group ordered and unordered elements
  2474. fragments.forEach( function( fragment, i ) {
  2475. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  2476. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  2477. if( !ordered[index] ) {
  2478. ordered[index] = [];
  2479. }
  2480. ordered[index].push( fragment );
  2481. }
  2482. else {
  2483. unordered.push( [ fragment ] );
  2484. }
  2485. } );
  2486. // Append fragments without explicit indices in their
  2487. // DOM order
  2488. ordered = ordered.concat( unordered );
  2489. // Manually count the index up per group to ensure there
  2490. // are no gaps
  2491. var index = 0;
  2492. // Push all fragments in their sorted order to an array,
  2493. // this flattens the groups
  2494. ordered.forEach( function( group ) {
  2495. group.forEach( function( fragment ) {
  2496. sorted.push( fragment );
  2497. fragment.setAttribute( 'data-fragment-index', index );
  2498. } );
  2499. index ++;
  2500. } );
  2501. return sorted;
  2502. }
  2503. /**
  2504. * Navigate to the specified slide fragment.
  2505. *
  2506. * @param {Number} index The index of the fragment that
  2507. * should be shown, -1 means all are invisible
  2508. * @param {Number} offset Integer offset to apply to the
  2509. * fragment index
  2510. *
  2511. * @return {Boolean} true if a change was made in any
  2512. * fragments visibility as part of this call
  2513. */
  2514. function navigateFragment( index, offset ) {
  2515. if( currentSlide && config.fragments ) {
  2516. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  2517. if( fragments.length ) {
  2518. // If no index is specified, find the current
  2519. if( typeof index !== 'number' ) {
  2520. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  2521. if( lastVisibleFragment ) {
  2522. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  2523. }
  2524. else {
  2525. index = -1;
  2526. }
  2527. }
  2528. // If an offset is specified, apply it to the index
  2529. if( typeof offset === 'number' ) {
  2530. index += offset;
  2531. }
  2532. var fragmentsShown = [],
  2533. fragmentsHidden = [];
  2534. toArray( fragments ).forEach( function( element, i ) {
  2535. if( element.hasAttribute( 'data-fragment-index' ) ) {
  2536. i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
  2537. }
  2538. // Visible fragments
  2539. if( i <= index ) {
  2540. if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
  2541. element.classList.add( 'visible' );
  2542. element.classList.remove( 'current-fragment' );
  2543. // Announce the fragments one by one to the Screen Reader
  2544. dom.statusDiv.textContent = element.textContent;
  2545. if( i === index ) {
  2546. element.classList.add( 'current-fragment' );
  2547. }
  2548. }
  2549. // Hidden fragments
  2550. else {
  2551. if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
  2552. element.classList.remove( 'visible' );
  2553. element.classList.remove( 'current-fragment' );
  2554. }
  2555. } );
  2556. if( fragmentsHidden.length ) {
  2557. dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
  2558. }
  2559. if( fragmentsShown.length ) {
  2560. dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
  2561. }
  2562. updateControls();
  2563. updateProgress();
  2564. return !!( fragmentsShown.length || fragmentsHidden.length );
  2565. }
  2566. }
  2567. return false;
  2568. }
  2569. /**
  2570. * Navigate to the next slide fragment.
  2571. *
  2572. * @return {Boolean} true if there was a next fragment,
  2573. * false otherwise
  2574. */
  2575. function nextFragment() {
  2576. return navigateFragment( null, 1 );
  2577. }
  2578. /**
  2579. * Navigate to the previous slide fragment.
  2580. *
  2581. * @return {Boolean} true if there was a previous fragment,
  2582. * false otherwise
  2583. */
  2584. function previousFragment() {
  2585. return navigateFragment( null, -1 );
  2586. }
  2587. /**
  2588. * Cues a new automated slide if enabled in the config.
  2589. */
  2590. function cueAutoSlide() {
  2591. cancelAutoSlide();
  2592. if( currentSlide ) {
  2593. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2594. var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null;
  2595. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  2596. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  2597. // Pick value in the following priority order:
  2598. // 1. Current fragment's data-autoslide
  2599. // 2. Current slide's data-autoslide
  2600. // 3. Parent slide's data-autoslide
  2601. // 4. Global autoSlide setting
  2602. if( fragmentAutoSlide ) {
  2603. autoSlide = parseInt( fragmentAutoSlide, 10 );
  2604. }
  2605. else if( slideAutoSlide ) {
  2606. autoSlide = parseInt( slideAutoSlide, 10 );
  2607. }
  2608. else if( parentAutoSlide ) {
  2609. autoSlide = parseInt( parentAutoSlide, 10 );
  2610. }
  2611. else {
  2612. autoSlide = config.autoSlide;
  2613. }
  2614. // If there are media elements with data-autoplay,
  2615. // automatically set the autoSlide duration to the
  2616. // length of that media
  2617. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2618. if( el.hasAttribute( 'data-autoplay' ) ) {
  2619. if( autoSlide && el.duration * 1000 > autoSlide ) {
  2620. autoSlide = ( el.duration * 1000 ) + 1000;
  2621. }
  2622. }
  2623. } );
  2624. // Cue the next auto-slide if:
  2625. // - There is an autoSlide value
  2626. // - Auto-sliding isn't paused by the user
  2627. // - The presentation isn't paused
  2628. // - The overview isn't active
  2629. // - The presentation isn't over
  2630. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  2631. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  2632. autoSlideStartTime = Date.now();
  2633. }
  2634. if( autoSlidePlayer ) {
  2635. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  2636. }
  2637. }
  2638. }
  2639. /**
  2640. * Cancels any ongoing request to auto-slide.
  2641. */
  2642. function cancelAutoSlide() {
  2643. clearTimeout( autoSlideTimeout );
  2644. autoSlideTimeout = -1;
  2645. }
  2646. function pauseAutoSlide() {
  2647. if( autoSlide && !autoSlidePaused ) {
  2648. autoSlidePaused = true;
  2649. dispatchEvent( 'autoslidepaused' );
  2650. clearTimeout( autoSlideTimeout );
  2651. if( autoSlidePlayer ) {
  2652. autoSlidePlayer.setPlaying( false );
  2653. }
  2654. }
  2655. }
  2656. function resumeAutoSlide() {
  2657. if( autoSlide && autoSlidePaused ) {
  2658. autoSlidePaused = false;
  2659. dispatchEvent( 'autoslideresumed' );
  2660. cueAutoSlide();
  2661. }
  2662. }
  2663. function navigateLeft() {
  2664. // Reverse for RTL
  2665. if( config.rtl ) {
  2666. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  2667. slide( indexh + 1 );
  2668. }
  2669. }
  2670. // Normal navigation
  2671. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  2672. slide( indexh - 1 );
  2673. }
  2674. }
  2675. function navigateRight() {
  2676. // Reverse for RTL
  2677. if( config.rtl ) {
  2678. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  2679. slide( indexh - 1 );
  2680. }
  2681. }
  2682. // Normal navigation
  2683. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  2684. slide( indexh + 1 );
  2685. }
  2686. }
  2687. function navigateUp() {
  2688. // Prioritize hiding fragments
  2689. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  2690. slide( indexh, indexv - 1 );
  2691. }
  2692. }
  2693. function navigateDown() {
  2694. // Prioritize revealing fragments
  2695. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  2696. slide( indexh, indexv + 1 );
  2697. }
  2698. }
  2699. /**
  2700. * Navigates backwards, prioritized in the following order:
  2701. * 1) Previous fragment
  2702. * 2) Previous vertical slide
  2703. * 3) Previous horizontal slide
  2704. */
  2705. function navigatePrev() {
  2706. // Prioritize revealing fragments
  2707. if( previousFragment() === false ) {
  2708. if( availableRoutes().up ) {
  2709. navigateUp();
  2710. }
  2711. else {
  2712. // Fetch the previous horizontal slide, if there is one
  2713. var previousSlide;
  2714. if( config.rtl ) {
  2715. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  2716. }
  2717. else {
  2718. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  2719. }
  2720. if( previousSlide ) {
  2721. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  2722. var h = indexh - 1;
  2723. slide( h, v );
  2724. }
  2725. }
  2726. }
  2727. }
  2728. /**
  2729. * The reverse of #navigatePrev().
  2730. */
  2731. function navigateNext() {
  2732. // Prioritize revealing fragments
  2733. if( nextFragment() === false ) {
  2734. if( availableRoutes().down ) {
  2735. navigateDown();
  2736. }
  2737. else if( config.rtl ) {
  2738. navigateLeft();
  2739. }
  2740. else {
  2741. navigateRight();
  2742. }
  2743. }
  2744. // If auto-sliding is enabled we need to cue up
  2745. // another timeout
  2746. cueAutoSlide();
  2747. }
  2748. // --------------------------------------------------------------------//
  2749. // ----------------------------- EVENTS -------------------------------//
  2750. // --------------------------------------------------------------------//
  2751. /**
  2752. * Called by all event handlers that are based on user
  2753. * input.
  2754. */
  2755. function onUserInput( event ) {
  2756. if( config.autoSlideStoppable ) {
  2757. pauseAutoSlide();
  2758. }
  2759. }
  2760. /**
  2761. * Handler for the document level 'keypress' event.
  2762. */
  2763. function onDocumentKeyPress( event ) {
  2764. // Check if the pressed key is question mark
  2765. if( event.shiftKey && event.charCode === 63 ) {
  2766. if( dom.overlay ) {
  2767. closeOverlay();
  2768. }
  2769. else {
  2770. showHelp( true );
  2771. }
  2772. }
  2773. }
  2774. /**
  2775. * Handler for the document level 'keydown' event.
  2776. */
  2777. function onDocumentKeyDown( event ) {
  2778. // If there's a condition specified and it returns false,
  2779. // ignore this event
  2780. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
  2781. return true;
  2782. }
  2783. // Remember if auto-sliding was paused so we can toggle it
  2784. var autoSlideWasPaused = autoSlidePaused;
  2785. onUserInput( event );
  2786. // Check if there's a focused element that could be using
  2787. // the keyboard
  2788. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  2789. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  2790. // Disregard the event if there's a focused element or a
  2791. // keyboard modifier key is present
  2792. if( activeElementIsCE || activeElementIsInput || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  2793. // While paused only allow "unpausing" keyboard events (b and .)
  2794. if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) {
  2795. return false;
  2796. }
  2797. var triggered = false;
  2798. // 1. User defined key bindings
  2799. if( typeof config.keyboard === 'object' ) {
  2800. for( var key in config.keyboard ) {
  2801. // Check if this binding matches the pressed key
  2802. if( parseInt( key, 10 ) === event.keyCode ) {
  2803. var value = config.keyboard[ key ];
  2804. // Callback function
  2805. if( typeof value === 'function' ) {
  2806. value.apply( null, [ event ] );
  2807. }
  2808. // String shortcuts to reveal.js API
  2809. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  2810. Reveal[ value ].call();
  2811. }
  2812. triggered = true;
  2813. }
  2814. }
  2815. }
  2816. // 2. System defined key bindings
  2817. if( triggered === false ) {
  2818. // Assume true and try to prove false
  2819. triggered = true;
  2820. switch( event.keyCode ) {
  2821. // p, page up
  2822. case 80: case 33: navigatePrev(); break;
  2823. // n, page down
  2824. case 78: case 34: navigateNext(); break;
  2825. // h, left
  2826. case 72: case 37: navigateLeft(); break;
  2827. // l, right
  2828. case 76: case 39: navigateRight(); break;
  2829. // k, up
  2830. case 75: case 38: navigateUp(); break;
  2831. // j, down
  2832. case 74: case 40: navigateDown(); break;
  2833. // home
  2834. case 36: slide( 0 ); break;
  2835. // end
  2836. case 35: slide( Number.MAX_VALUE ); break;
  2837. // space
  2838. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  2839. // return
  2840. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  2841. // two-spot, semicolon, b, period, Logitech presenter tools "black screen" button
  2842. case 58: case 59: case 66: case 190: case 191: togglePause(); break;
  2843. // f
  2844. case 70: enterFullscreen(); break;
  2845. // a
  2846. case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
  2847. default:
  2848. triggered = false;
  2849. }
  2850. }
  2851. // If the input resulted in a triggered action we should prevent
  2852. // the browsers default behavior
  2853. if( triggered ) {
  2854. event.preventDefault && event.preventDefault();
  2855. }
  2856. // ESC or O key
  2857. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  2858. if( dom.overlay ) {
  2859. closeOverlay();
  2860. }
  2861. else {
  2862. toggleOverview();
  2863. }
  2864. event.preventDefault && event.preventDefault();
  2865. }
  2866. // If auto-sliding is enabled we need to cue up
  2867. // another timeout
  2868. cueAutoSlide();
  2869. }
  2870. /**
  2871. * Handler for the 'touchstart' event, enables support for
  2872. * swipe and pinch gestures.
  2873. */
  2874. function onTouchStart( event ) {
  2875. touch.startX = event.touches[0].clientX;
  2876. touch.startY = event.touches[0].clientY;
  2877. touch.startCount = event.touches.length;
  2878. // If there's two touches we need to memorize the distance
  2879. // between those two points to detect pinching
  2880. if( event.touches.length === 2 && config.overview ) {
  2881. touch.startSpan = distanceBetween( {
  2882. x: event.touches[1].clientX,
  2883. y: event.touches[1].clientY
  2884. }, {
  2885. x: touch.startX,
  2886. y: touch.startY
  2887. } );
  2888. }
  2889. }
  2890. /**
  2891. * Handler for the 'touchmove' event.
  2892. */
  2893. function onTouchMove( event ) {
  2894. // Each touch should only trigger one action
  2895. if( !touch.captured ) {
  2896. onUserInput( event );
  2897. var currentX = event.touches[0].clientX;
  2898. var currentY = event.touches[0].clientY;
  2899. // If the touch started with two points and still has
  2900. // two active touches; test for the pinch gesture
  2901. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  2902. // The current distance in pixels between the two touch points
  2903. var currentSpan = distanceBetween( {
  2904. x: event.touches[1].clientX,
  2905. y: event.touches[1].clientY
  2906. }, {
  2907. x: touch.startX,
  2908. y: touch.startY
  2909. } );
  2910. // If the span is larger than the desire amount we've got
  2911. // ourselves a pinch
  2912. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  2913. touch.captured = true;
  2914. if( currentSpan < touch.startSpan ) {
  2915. activateOverview();
  2916. }
  2917. else {
  2918. deactivateOverview();
  2919. }
  2920. }
  2921. event.preventDefault();
  2922. }
  2923. // There was only one touch point, look for a swipe
  2924. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  2925. var deltaX = currentX - touch.startX,
  2926. deltaY = currentY - touch.startY;
  2927. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2928. touch.captured = true;
  2929. navigateLeft();
  2930. }
  2931. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2932. touch.captured = true;
  2933. navigateRight();
  2934. }
  2935. else if( deltaY > touch.threshold ) {
  2936. touch.captured = true;
  2937. navigateUp();
  2938. }
  2939. else if( deltaY < -touch.threshold ) {
  2940. touch.captured = true;
  2941. navigateDown();
  2942. }
  2943. // If we're embedded, only block touch events if they have
  2944. // triggered an action
  2945. if( config.embedded ) {
  2946. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  2947. event.preventDefault();
  2948. }
  2949. }
  2950. // Not embedded? Block them all to avoid needless tossing
  2951. // around of the viewport in iOS
  2952. else {
  2953. event.preventDefault();
  2954. }
  2955. }
  2956. }
  2957. // There's a bug with swiping on some Android devices unless
  2958. // the default action is always prevented
  2959. else if( navigator.userAgent.match( /android/gi ) ) {
  2960. event.preventDefault();
  2961. }
  2962. }
  2963. /**
  2964. * Handler for the 'touchend' event.
  2965. */
  2966. function onTouchEnd( event ) {
  2967. touch.captured = false;
  2968. }
  2969. /**
  2970. * Convert pointer down to touch start.
  2971. */
  2972. function onPointerDown( event ) {
  2973. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2974. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2975. onTouchStart( event );
  2976. }
  2977. }
  2978. /**
  2979. * Convert pointer move to touch move.
  2980. */
  2981. function onPointerMove( event ) {
  2982. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2983. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2984. onTouchMove( event );
  2985. }
  2986. }
  2987. /**
  2988. * Convert pointer up to touch end.
  2989. */
  2990. function onPointerUp( event ) {
  2991. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2992. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2993. onTouchEnd( event );
  2994. }
  2995. }
  2996. /**
  2997. * Handles mouse wheel scrolling, throttled to avoid skipping
  2998. * multiple slides.
  2999. */
  3000. function onDocumentMouseScroll( event ) {
  3001. if( Date.now() - lastMouseWheelStep > 600 ) {
  3002. lastMouseWheelStep = Date.now();
  3003. var delta = event.detail || -event.wheelDelta;
  3004. if( delta > 0 ) {
  3005. navigateNext();
  3006. }
  3007. else {
  3008. navigatePrev();
  3009. }
  3010. }
  3011. }
  3012. /**
  3013. * Clicking on the progress bar results in a navigation to the
  3014. * closest approximate horizontal slide using this equation:
  3015. *
  3016. * ( clickX / presentationWidth ) * numberOfSlides
  3017. */
  3018. function onProgressClicked( event ) {
  3019. onUserInput( event );
  3020. event.preventDefault();
  3021. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  3022. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  3023. slide( slideIndex );
  3024. }
  3025. /**
  3026. * Event handler for navigation control buttons.
  3027. */
  3028. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  3029. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  3030. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  3031. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  3032. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  3033. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  3034. /**
  3035. * Handler for the window level 'hashchange' event.
  3036. */
  3037. function onWindowHashChange( event ) {
  3038. readURL();
  3039. }
  3040. /**
  3041. * Handler for the window level 'resize' event.
  3042. */
  3043. function onWindowResize( event ) {
  3044. layout();
  3045. }
  3046. /**
  3047. * Handle for the window level 'visibilitychange' event.
  3048. */
  3049. function onPageVisibilityChange( event ) {
  3050. var isHidden = document.webkitHidden ||
  3051. document.msHidden ||
  3052. document.hidden;
  3053. // If, after clicking a link or similar and we're coming back,
  3054. // focus the document.body to ensure we can use keyboard shortcuts
  3055. if( isHidden === false && document.activeElement !== document.body ) {
  3056. document.activeElement.blur();
  3057. document.body.focus();
  3058. }
  3059. }
  3060. /**
  3061. * Invoked when a slide is and we're in the overview.
  3062. */
  3063. function onOverviewSlideClicked( event ) {
  3064. // TODO There's a bug here where the event listeners are not
  3065. // removed after deactivating the overview.
  3066. if( eventsAreBound && isOverview() ) {
  3067. event.preventDefault();
  3068. var element = event.target;
  3069. while( element && !element.nodeName.match( /section/gi ) ) {
  3070. element = element.parentNode;
  3071. }
  3072. if( element && !element.classList.contains( 'disabled' ) ) {
  3073. deactivateOverview();
  3074. if( element.nodeName.match( /section/gi ) ) {
  3075. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  3076. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  3077. slide( h, v );
  3078. }
  3079. }
  3080. }
  3081. }
  3082. /**
  3083. * Handles clicks on links that are set to preview in the
  3084. * iframe overlay.
  3085. */
  3086. function onPreviewLinkClicked( event ) {
  3087. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  3088. var url = event.currentTarget.getAttribute( 'href' );
  3089. if( url ) {
  3090. showPreview( url );
  3091. event.preventDefault();
  3092. }
  3093. }
  3094. }
  3095. /**
  3096. * Handles click on the auto-sliding controls element.
  3097. */
  3098. function onAutoSlidePlayerClick( event ) {
  3099. // Replay
  3100. if( Reveal.isLastSlide() && config.loop === false ) {
  3101. slide( 0, 0 );
  3102. resumeAutoSlide();
  3103. }
  3104. // Resume
  3105. else if( autoSlidePaused ) {
  3106. resumeAutoSlide();
  3107. }
  3108. // Pause
  3109. else {
  3110. pauseAutoSlide();
  3111. }
  3112. }
  3113. // --------------------------------------------------------------------//
  3114. // ------------------------ PLAYBACK COMPONENT ------------------------//
  3115. // --------------------------------------------------------------------//
  3116. /**
  3117. * Constructor for the playback component, which displays
  3118. * play/pause/progress controls.
  3119. *
  3120. * @param {HTMLElement} container The component will append
  3121. * itself to this
  3122. * @param {Function} progressCheck A method which will be
  3123. * called frequently to get the current progress on a range
  3124. * of 0-1
  3125. */
  3126. function Playback( container, progressCheck ) {
  3127. // Cosmetics
  3128. this.diameter = 50;
  3129. this.thickness = 3;
  3130. // Flags if we are currently playing
  3131. this.playing = false;
  3132. // Current progress on a 0-1 range
  3133. this.progress = 0;
  3134. // Used to loop the animation smoothly
  3135. this.progressOffset = 1;
  3136. this.container = container;
  3137. this.progressCheck = progressCheck;
  3138. this.canvas = document.createElement( 'canvas' );
  3139. this.canvas.className = 'playback';
  3140. this.canvas.width = this.diameter;
  3141. this.canvas.height = this.diameter;
  3142. this.context = this.canvas.getContext( '2d' );
  3143. this.container.appendChild( this.canvas );
  3144. this.render();
  3145. }
  3146. Playback.prototype.setPlaying = function( value ) {
  3147. var wasPlaying = this.playing;
  3148. this.playing = value;
  3149. // Start repainting if we weren't already
  3150. if( !wasPlaying && this.playing ) {
  3151. this.animate();
  3152. }
  3153. else {
  3154. this.render();
  3155. }
  3156. };
  3157. Playback.prototype.animate = function() {
  3158. var progressBefore = this.progress;
  3159. this.progress = this.progressCheck();
  3160. // When we loop, offset the progress so that it eases
  3161. // smoothly rather than immediately resetting
  3162. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  3163. this.progressOffset = this.progress;
  3164. }
  3165. this.render();
  3166. if( this.playing ) {
  3167. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  3168. }
  3169. };
  3170. /**
  3171. * Renders the current progress and playback state.
  3172. */
  3173. Playback.prototype.render = function() {
  3174. var progress = this.playing ? this.progress : 0,
  3175. radius = ( this.diameter / 2 ) - this.thickness,
  3176. x = this.diameter / 2,
  3177. y = this.diameter / 2,
  3178. iconSize = 14;
  3179. // Ease towards 1
  3180. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  3181. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  3182. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  3183. this.context.save();
  3184. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  3185. // Solid background color
  3186. this.context.beginPath();
  3187. this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false );
  3188. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  3189. this.context.fill();
  3190. // Draw progress track
  3191. this.context.beginPath();
  3192. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  3193. this.context.lineWidth = this.thickness;
  3194. this.context.strokeStyle = '#666';
  3195. this.context.stroke();
  3196. if( this.playing ) {
  3197. // Draw progress on top of track
  3198. this.context.beginPath();
  3199. this.context.arc( x, y, radius, startAngle, endAngle, false );
  3200. this.context.lineWidth = this.thickness;
  3201. this.context.strokeStyle = '#fff';
  3202. this.context.stroke();
  3203. }
  3204. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  3205. // Draw play/pause icons
  3206. if( this.playing ) {
  3207. this.context.fillStyle = '#fff';
  3208. this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize );
  3209. this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize );
  3210. }
  3211. else {
  3212. this.context.beginPath();
  3213. this.context.translate( 2, 0 );
  3214. this.context.moveTo( 0, 0 );
  3215. this.context.lineTo( iconSize - 2, iconSize / 2 );
  3216. this.context.lineTo( 0, iconSize );
  3217. this.context.fillStyle = '#fff';
  3218. this.context.fill();
  3219. }
  3220. this.context.restore();
  3221. };
  3222. Playback.prototype.on = function( type, listener ) {
  3223. this.canvas.addEventListener( type, listener, false );
  3224. };
  3225. Playback.prototype.off = function( type, listener ) {
  3226. this.canvas.removeEventListener( type, listener, false );
  3227. };
  3228. Playback.prototype.destroy = function() {
  3229. this.playing = false;
  3230. if( this.canvas.parentNode ) {
  3231. this.container.removeChild( this.canvas );
  3232. }
  3233. };
  3234. // --------------------------------------------------------------------//
  3235. // ------------------------------- API --------------------------------//
  3236. // --------------------------------------------------------------------//
  3237. Reveal = {
  3238. initialize: initialize,
  3239. configure: configure,
  3240. sync: sync,
  3241. // Navigation methods
  3242. slide: slide,
  3243. left: navigateLeft,
  3244. right: navigateRight,
  3245. up: navigateUp,
  3246. down: navigateDown,
  3247. prev: navigatePrev,
  3248. next: navigateNext,
  3249. // Fragment methods
  3250. navigateFragment: navigateFragment,
  3251. prevFragment: previousFragment,
  3252. nextFragment: nextFragment,
  3253. // Deprecated aliases
  3254. navigateTo: slide,
  3255. navigateLeft: navigateLeft,
  3256. navigateRight: navigateRight,
  3257. navigateUp: navigateUp,
  3258. navigateDown: navigateDown,
  3259. navigatePrev: navigatePrev,
  3260. navigateNext: navigateNext,
  3261. // Forces an update in slide layout
  3262. layout: layout,
  3263. // Returns an object with the available routes as booleans (left/right/top/bottom)
  3264. availableRoutes: availableRoutes,
  3265. // Returns an object with the available fragments as booleans (prev/next)
  3266. availableFragments: availableFragments,
  3267. // Toggles the overview mode on/off
  3268. toggleOverview: toggleOverview,
  3269. // Toggles the "black screen" mode on/off
  3270. togglePause: togglePause,
  3271. // Toggles the auto slide mode on/off
  3272. toggleAutoSlide: toggleAutoSlide,
  3273. // State checks
  3274. isOverview: isOverview,
  3275. isPaused: isPaused,
  3276. isAutoSliding: isAutoSliding,
  3277. // Adds or removes all internal event listeners (such as keyboard)
  3278. addEventListeners: addEventListeners,
  3279. removeEventListeners: removeEventListeners,
  3280. // Facility for persisting and restoring the presentation state
  3281. getState: getState,
  3282. setState: setState,
  3283. // Presentation progress on range of 0-1
  3284. getProgress: getProgress,
  3285. // Returns the indices of the current, or specified, slide
  3286. getIndices: getIndices,
  3287. getTotalSlides: getTotalSlides,
  3288. // Returns the slide element at the specified index
  3289. getSlide: getSlide,
  3290. // Returns the slide background element at the specified index
  3291. getSlideBackground: getSlideBackground,
  3292. // Returns the previous slide element, may be null
  3293. getPreviousSlide: function() {
  3294. return previousSlide;
  3295. },
  3296. // Returns the current slide element
  3297. getCurrentSlide: function() {
  3298. return currentSlide;
  3299. },
  3300. // Returns the current scale of the presentation content
  3301. getScale: function() {
  3302. return scale;
  3303. },
  3304. // Returns the current configuration object
  3305. getConfig: function() {
  3306. return config;
  3307. },
  3308. // Helper method, retrieves query string as a key/value hash
  3309. getQueryHash: function() {
  3310. var query = {};
  3311. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  3312. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  3313. } );
  3314. // Basic deserialization
  3315. for( var i in query ) {
  3316. var value = query[ i ];
  3317. query[ i ] = deserialize( unescape( value ) );
  3318. }
  3319. return query;
  3320. },
  3321. // Returns true if we're currently on the first slide
  3322. isFirstSlide: function() {
  3323. return ( indexh === 0 && indexv === 0 );
  3324. },
  3325. // Returns true if we're currently on the last slide
  3326. isLastSlide: function() {
  3327. if( currentSlide ) {
  3328. // Does this slide has next a sibling?
  3329. if( currentSlide.nextElementSibling ) return false;
  3330. // If it's vertical, does its parent have a next sibling?
  3331. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  3332. return true;
  3333. }
  3334. return false;
  3335. },
  3336. // Checks if reveal.js has been loaded and is ready for use
  3337. isReady: function() {
  3338. return loaded;
  3339. },
  3340. // Forward event binding to the reveal DOM element
  3341. addEventListener: function( type, listener, useCapture ) {
  3342. if( 'addEventListener' in window ) {
  3343. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  3344. }
  3345. },
  3346. removeEventListener: function( type, listener, useCapture ) {
  3347. if( 'addEventListener' in window ) {
  3348. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  3349. }
  3350. },
  3351. // Programatically triggers a keyboard event
  3352. triggerKey: function( keyCode ) {
  3353. onDocumentKeyDown( { keyCode: keyCode } );
  3354. }
  3355. };
  3356. return Reveal;
  3357. }));