reveal.js 114 KB

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  1. /*!
  2. * reveal.js
  3. * http://lab.hakim.se/reveal-js
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2014 Hakim El Hattab, http://hakim.se
  7. */
  8. (function( root, factory ) {
  9. if( typeof define === 'function' && define.amd ) {
  10. // AMD. Register as an anonymous module.
  11. define( function() {
  12. root.Reveal = factory();
  13. return root.Reveal;
  14. } );
  15. } else if( typeof exports === 'object' ) {
  16. // Node. Does not work with strict CommonJS.
  17. module.exports = factory();
  18. } else {
  19. // Browser globals.
  20. root.Reveal = factory();
  21. }
  22. }( this, function() {
  23. 'use strict';
  24. var Reveal;
  25. var SLIDES_SELECTOR = '.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: 1.0,
  40. // Display controls in the bottom right corner
  41. controls: true,
  42. // Display a presentation progress bar
  43. progress: true,
  44. // Display the page number of the current slide
  45. slideNumber: false,
  46. // Push each slide change to the browser history
  47. history: false,
  48. // Enable keyboard shortcuts for navigation
  49. keyboard: true,
  50. // Optional function that blocks keyboard events when retuning false
  51. keyboardCondition: null,
  52. // Enable the slide overview mode
  53. overview: true,
  54. // Vertical centering of slides
  55. center: true,
  56. // Enables touch navigation on devices with touch input
  57. touch: true,
  58. // Loop the presentation
  59. loop: false,
  60. // Change the presentation direction to be RTL
  61. rtl: false,
  62. // Turns fragments on and off globally
  63. fragments: true,
  64. // Flags if the presentation is running in an embedded mode,
  65. // i.e. contained within a limited portion of the screen
  66. embedded: false,
  67. // 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. // Theme (see /css/theme)
  93. theme: null,
  94. // Transition style
  95. transition: 'default', // none/fade/slide/convex/concave/zoom
  96. // Transition speed
  97. transitionSpeed: 'default', // default/fast/slow
  98. // Transition style for full page slide backgrounds
  99. backgroundTransition: 'default', // none/fade/slide/convex/concave/zoom
  100. // Parallax background image
  101. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  102. // Parallax background size
  103. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  104. // Number of slides away from the current that are visible
  105. viewDistance: 3,
  106. // Script dependencies to load
  107. dependencies: []
  108. },
  109. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  110. loaded = 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. // Cached references to DOM elements
  125. dom = {},
  126. // Features supported by the browser, see #checkCapabilities()
  127. features = {},
  128. // Client is a mobile device, see #checkCapabilities()
  129. isMobileDevice,
  130. // Throttles mouse wheel navigation
  131. lastMouseWheelStep = 0,
  132. // Delays updates to the URL due to a Chrome thumbnailer bug
  133. writeURLTimeout = 0,
  134. // Flags if the interaction event listeners are bound
  135. eventsAreBound = false,
  136. // The current auto-slide duration
  137. autoSlide = 0,
  138. // Auto slide properties
  139. autoSlidePlayer,
  140. autoSlideTimeout = 0,
  141. autoSlideStartTime = -1,
  142. autoSlidePaused = false,
  143. // Holds information about the currently ongoing touch input
  144. touch = {
  145. startX: 0,
  146. startY: 0,
  147. startSpan: 0,
  148. startCount: 0,
  149. captured: false,
  150. threshold: 40
  151. },
  152. // Holds information about the keyboard shortcuts
  153. keyboardShortcuts = {
  154. 'N , SPACE': 'Next slide',
  155. 'P': 'Previous slide',
  156. '← , H': 'Navigate left',
  157. '→ , L': 'Navigate right',
  158. '↑ , K': 'Navigate up',
  159. '↓ , J': 'Navigate down',
  160. 'Home': 'First slide',
  161. 'End': 'Last slide',
  162. 'B , .': 'Pause',
  163. 'F': 'Fullscreen',
  164. 'ESC, O': 'Slide overview'
  165. };
  166. /**
  167. * Starts up the presentation if the client is capable.
  168. */
  169. function initialize( options ) {
  170. checkCapabilities();
  171. if( !features.transforms2d && !features.transforms3d ) {
  172. document.body.setAttribute( 'class', 'no-transforms' );
  173. // Since JS won't be running any further, we need to load all
  174. // images that were intended to lazy load now
  175. var images = document.getElementsByTagName( 'img' );
  176. for( var i = 0, len = images.length; i < len; i++ ) {
  177. var image = images[i];
  178. if( image.getAttribute( 'data-src' ) ) {
  179. image.setAttribute( 'src', image.getAttribute( 'data-src' ) );
  180. image.removeAttribute( 'data-src' );
  181. }
  182. }
  183. // If the browser doesn't support core features we won't be
  184. // using JavaScript to control the presentation
  185. return;
  186. }
  187. // Cache references to key DOM elements
  188. dom.wrapper = document.querySelector( '.reveal' );
  189. dom.slides = document.querySelector( '.reveal .slides' );
  190. // Force a layout when the whole page, incl fonts, has loaded
  191. window.addEventListener( 'load', layout, false );
  192. var query = Reveal.getQueryHash();
  193. // Do not accept new dependencies via query config to avoid
  194. // the potential of malicious script injection
  195. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  196. // Copy options over to our config object
  197. extend( config, options );
  198. extend( config, query );
  199. // Hide the address bar in mobile browsers
  200. hideAddressBar();
  201. // Loads the dependencies and continues to #start() once done
  202. load();
  203. }
  204. /**
  205. * Inspect the client to see what it's capable of, this
  206. * should only happens once per runtime.
  207. */
  208. function checkCapabilities() {
  209. features.transforms3d = 'WebkitPerspective' in document.body.style ||
  210. 'MozPerspective' in document.body.style ||
  211. 'msPerspective' in document.body.style ||
  212. 'OPerspective' in document.body.style ||
  213. 'perspective' in document.body.style;
  214. features.transforms2d = 'WebkitTransform' in document.body.style ||
  215. 'MozTransform' in document.body.style ||
  216. 'msTransform' in document.body.style ||
  217. 'OTransform' in document.body.style ||
  218. 'transform' in document.body.style;
  219. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  220. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  221. features.canvas = !!document.createElement( 'canvas' ).getContext;
  222. features.touch = !!( 'ontouchstart' in window );
  223. isMobileDevice = navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi );
  224. }
  225. /**
  226. * Loads the dependencies of reveal.js. Dependencies are
  227. * defined via the configuration option 'dependencies'
  228. * and will be loaded prior to starting/binding reveal.js.
  229. * Some dependencies may have an 'async' flag, if so they
  230. * will load after reveal.js has been started up.
  231. */
  232. function load() {
  233. var scripts = [],
  234. scriptsAsync = [],
  235. scriptsToPreload = 0;
  236. // Called once synchronous scripts finish loading
  237. function proceed() {
  238. if( scriptsAsync.length ) {
  239. // Load asynchronous scripts
  240. head.js.apply( null, scriptsAsync );
  241. }
  242. start();
  243. }
  244. function loadScript( s ) {
  245. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
  246. // Extension may contain callback functions
  247. if( typeof s.callback === 'function' ) {
  248. s.callback.apply( this );
  249. }
  250. if( --scriptsToPreload === 0 ) {
  251. proceed();
  252. }
  253. });
  254. }
  255. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  256. var s = config.dependencies[i];
  257. // Load if there's no condition or the condition is truthy
  258. if( !s.condition || s.condition() ) {
  259. if( s.async ) {
  260. scriptsAsync.push( s.src );
  261. }
  262. else {
  263. scripts.push( s.src );
  264. }
  265. loadScript( s );
  266. }
  267. }
  268. if( scripts.length ) {
  269. scriptsToPreload = scripts.length;
  270. // Load synchronous scripts
  271. head.js.apply( null, scripts );
  272. }
  273. else {
  274. proceed();
  275. }
  276. }
  277. /**
  278. * Starts up reveal.js by binding input events and navigating
  279. * to the current URL deeplink if there is one.
  280. */
  281. function start() {
  282. // Make sure we've got all the DOM elements we need
  283. setupDOM();
  284. // Listen to messages posted to this window
  285. setupPostMessage();
  286. // Resets all vertical slides so that only the first is visible
  287. resetVerticalSlides();
  288. // Updates the presentation to match the current configuration values
  289. configure();
  290. // Read the initial hash
  291. readURL();
  292. // Update all backgrounds
  293. updateBackground( true );
  294. // Notify listeners that the presentation is ready but use a 1ms
  295. // timeout to ensure it's not fired synchronously after #initialize()
  296. setTimeout( function() {
  297. // Enable transitions now that we're loaded
  298. dom.slides.classList.remove( 'no-transition' );
  299. loaded = true;
  300. dispatchEvent( 'ready', {
  301. 'indexh': indexh,
  302. 'indexv': indexv,
  303. 'currentSlide': currentSlide
  304. } );
  305. }, 1 );
  306. // Special setup and config is required when printing to PDF
  307. if( isPrintingPDF() ) {
  308. removeEventListeners();
  309. // The document needs to have loaded for the PDF layout
  310. // measurements to be accurate
  311. if( document.readyState === 'complete' ) {
  312. setupPDF();
  313. }
  314. else {
  315. window.addEventListener( 'load', setupPDF );
  316. }
  317. }
  318. }
  319. /**
  320. * Finds and stores references to DOM elements which are
  321. * required by the presentation. If a required element is
  322. * not found, it is created.
  323. */
  324. function setupDOM() {
  325. // Prevent transitions while we're loading
  326. dom.slides.classList.add( 'no-transition' );
  327. // Background element
  328. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  329. // Progress bar
  330. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  331. dom.progressbar = dom.progress.querySelector( 'span' );
  332. // Arrow controls
  333. createSingletonNode( dom.wrapper, 'aside', 'controls',
  334. '<div class="navigate-left"></div>' +
  335. '<div class="navigate-right"></div>' +
  336. '<div class="navigate-up"></div>' +
  337. '<div class="navigate-down"></div>' );
  338. // Slide number
  339. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  340. // State background element [DEPRECATED]
  341. createSingletonNode( dom.wrapper, 'div', 'state-background', null );
  342. // Overlay graphic which is displayed during the paused mode
  343. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  344. // Cache references to elements
  345. dom.controls = document.querySelector( '.reveal .controls' );
  346. dom.theme = document.querySelector( '#theme' );
  347. dom.wrapper.setAttribute( 'role', 'application' );
  348. // There can be multiple instances of controls throughout the page
  349. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  350. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  351. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  352. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  353. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  354. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  355. dom.statusDiv = createStatusDiv();
  356. }
  357. /**
  358. * Creates a hidden div with role aria-live to announce the
  359. * current slide content. Hide the div off-screen to make it
  360. * available only to Assistive Technologies.
  361. */
  362. function createStatusDiv() {
  363. var statusDiv = document.getElementById( 'aria-status-div' );
  364. if( !statusDiv ) {
  365. statusDiv = document.createElement( 'div' );
  366. statusDiv.style.position = 'absolute';
  367. statusDiv.style.height = '1px';
  368. statusDiv.style.width = '1px';
  369. statusDiv.style.overflow ='hidden';
  370. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  371. statusDiv.setAttribute( 'id', 'aria-status-div' );
  372. statusDiv.setAttribute( 'aria-live', 'polite' );
  373. statusDiv.setAttribute( 'aria-atomic','true' );
  374. dom.wrapper.appendChild( statusDiv );
  375. }
  376. return statusDiv;
  377. }
  378. /**
  379. * Configures the presentation for printing to a static
  380. * PDF.
  381. */
  382. function setupPDF() {
  383. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  384. // Dimensions of the PDF pages
  385. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  386. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  387. // Dimensions of slides within the pages
  388. var slideWidth = slideSize.width,
  389. slideHeight = slideSize.height;
  390. // Let the browser know what page size we want to print
  391. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' );
  392. // Limit the size of certain elements to the dimensions of the slide
  393. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  394. document.body.classList.add( 'print-pdf' );
  395. document.body.style.width = pageWidth + 'px';
  396. document.body.style.height = pageHeight + 'px';
  397. // Slide and slide background layout
  398. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  399. // Vertical stacks are not centred since their section
  400. // children will be
  401. if( slide.classList.contains( 'stack' ) === false ) {
  402. // Center the slide inside of the page, giving the slide some margin
  403. var left = ( pageWidth - slideWidth ) / 2,
  404. top = ( pageHeight - slideHeight ) / 2;
  405. var contentHeight = getAbsoluteHeight( slide );
  406. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  407. // Center slides vertically
  408. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  409. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  410. }
  411. // Position the slide inside of the page
  412. slide.style.left = left + 'px';
  413. slide.style.top = top + 'px';
  414. slide.style.width = slideWidth + 'px';
  415. // TODO Backgrounds need to be multiplied when the slide
  416. // stretches over multiple pages
  417. var background = slide.querySelector( '.slide-background' );
  418. if( background ) {
  419. background.style.width = pageWidth + 'px';
  420. background.style.height = ( pageHeight * numberOfPages ) + 'px';
  421. background.style.top = -top + 'px';
  422. background.style.left = -left + 'px';
  423. }
  424. }
  425. } );
  426. // Show all fragments
  427. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
  428. fragment.classList.add( 'visible' );
  429. } );
  430. }
  431. /**
  432. * Creates an HTML element and returns a reference to it.
  433. * If the element already exists the existing instance will
  434. * be returned.
  435. */
  436. function createSingletonNode( container, tagname, classname, innerHTML ) {
  437. // Find all nodes matching the description
  438. var nodes = container.querySelectorAll( '.' + classname );
  439. // Check all matches to find one which is a direct child of
  440. // the specified container
  441. for( var i = 0; i < nodes.length; i++ ) {
  442. var testNode = nodes[i];
  443. if( testNode.parentNode === container ) {
  444. return testNode;
  445. }
  446. }
  447. // If no node was found, create it now
  448. var node = document.createElement( tagname );
  449. node.classList.add( classname );
  450. if( typeof innerHTML === 'string' ) {
  451. node.innerHTML = innerHTML;
  452. }
  453. container.appendChild( node );
  454. return node;
  455. }
  456. /**
  457. * Creates the slide background elements and appends them
  458. * to the background container. One element is created per
  459. * slide no matter if the given slide has visible background.
  460. */
  461. function createBackgrounds() {
  462. var printMode = isPrintingPDF();
  463. // Clear prior backgrounds
  464. dom.background.innerHTML = '';
  465. dom.background.classList.add( 'no-transition' );
  466. // Iterate over all horizontal slides
  467. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  468. var backgroundStack;
  469. if( printMode ) {
  470. backgroundStack = createBackground( slideh, slideh );
  471. }
  472. else {
  473. backgroundStack = createBackground( slideh, dom.background );
  474. }
  475. // Iterate over all vertical slides
  476. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  477. if( printMode ) {
  478. createBackground( slidev, slidev );
  479. }
  480. else {
  481. createBackground( slidev, backgroundStack );
  482. }
  483. backgroundStack.classList.add( 'stack' );
  484. } );
  485. } );
  486. // Add parallax background if specified
  487. if( config.parallaxBackgroundImage ) {
  488. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  489. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  490. // Make sure the below properties are set on the element - these properties are
  491. // needed for proper transitions to be set on the element via CSS. To remove
  492. // annoying background slide-in effect when the presentation starts, apply
  493. // these properties after short time delay
  494. setTimeout( function() {
  495. dom.wrapper.classList.add( 'has-parallax-background' );
  496. }, 1 );
  497. }
  498. else {
  499. dom.background.style.backgroundImage = '';
  500. dom.wrapper.classList.remove( 'has-parallax-background' );
  501. }
  502. }
  503. /**
  504. * Creates a background for the given slide.
  505. *
  506. * @param {HTMLElement} slide
  507. * @param {HTMLElement} container The element that the background
  508. * should be appended to
  509. */
  510. function createBackground( slide, container ) {
  511. var data = {
  512. background: slide.getAttribute( 'data-background' ),
  513. backgroundSize: slide.getAttribute( 'data-background-size' ),
  514. backgroundImage: slide.getAttribute( 'data-background-image' ),
  515. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  516. backgroundColor: slide.getAttribute( 'data-background-color' ),
  517. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  518. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  519. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  520. };
  521. var element = document.createElement( 'div' );
  522. // Carry over custom classes from the slide to the background
  523. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  524. if( data.background ) {
  525. // Auto-wrap image urls in url(...)
  526. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
  527. slide.setAttribute( 'data-background-image', data.background );
  528. }
  529. else {
  530. element.style.background = data.background;
  531. }
  532. }
  533. // Create a hash for this combination of background settings.
  534. // This is used to determine when two slide backgrounds are
  535. // the same.
  536. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo ) {
  537. element.setAttribute( 'data-background-hash', data.background +
  538. data.backgroundSize +
  539. data.backgroundImage +
  540. data.backgroundVideo +
  541. data.backgroundColor +
  542. data.backgroundRepeat +
  543. data.backgroundPosition +
  544. data.backgroundTransition );
  545. }
  546. // Additional and optional background properties
  547. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  548. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  549. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  550. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  551. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  552. container.appendChild( element );
  553. // If backgrounds are being recreated, clear old classes
  554. slide.classList.remove( 'has-dark-background' );
  555. slide.classList.remove( 'has-light-background' );
  556. // If this slide has a background color, add a class that
  557. // signals if it is light or dark. If the slide has no background
  558. // color, no class will be set
  559. var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor;
  560. if( computedBackgroundColor ) {
  561. var rgb = colorToRgb( computedBackgroundColor );
  562. // Ignore fully transparent backgrounds. Some browsers return
  563. // rgba(0,0,0,0) when reading the computed background color of
  564. // an element with no background
  565. if( rgb && rgb.a !== 0 ) {
  566. if( colorBrightness( computedBackgroundColor ) < 128 ) {
  567. slide.classList.add( 'has-dark-background' );
  568. }
  569. else {
  570. slide.classList.add( 'has-light-background' );
  571. }
  572. }
  573. }
  574. return element;
  575. }
  576. /**
  577. * Registers a listener to postMessage events, this makes it
  578. * possible to call all reveal.js API methods from another
  579. * window. For example:
  580. *
  581. * revealWindow.postMessage( JSON.stringify({
  582. * method: 'slide',
  583. * args: [ 2 ]
  584. * }), '*' );
  585. */
  586. function setupPostMessage() {
  587. if( config.postMessage ) {
  588. window.addEventListener( 'message', function ( event ) {
  589. var data = event.data;
  590. // Make sure we're dealing with JSON
  591. if( data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  592. data = JSON.parse( data );
  593. // Check if the requested method can be found
  594. if( data.method && typeof Reveal[data.method] === 'function' ) {
  595. Reveal[data.method].apply( Reveal, data.args );
  596. }
  597. }
  598. }, false );
  599. }
  600. }
  601. /**
  602. * Applies the configuration settings from the config
  603. * object. May be called multiple times.
  604. */
  605. function configure( options ) {
  606. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  607. dom.wrapper.classList.remove( config.transition );
  608. // New config options may be passed when this method
  609. // is invoked through the API after initialization
  610. if( typeof options === 'object' ) extend( config, options );
  611. // Force linear transition based on browser capabilities
  612. if( features.transforms3d === false ) config.transition = 'linear';
  613. dom.wrapper.classList.add( config.transition );
  614. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  615. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  616. dom.controls.style.display = config.controls ? 'block' : 'none';
  617. dom.progress.style.display = config.progress ? 'block' : 'none';
  618. if( config.rtl ) {
  619. dom.wrapper.classList.add( 'rtl' );
  620. }
  621. else {
  622. dom.wrapper.classList.remove( 'rtl' );
  623. }
  624. if( config.center ) {
  625. dom.wrapper.classList.add( 'center' );
  626. }
  627. else {
  628. dom.wrapper.classList.remove( 'center' );
  629. }
  630. // Exit the paused mode if it was configured off
  631. if( config.pause === false ) {
  632. resume();
  633. }
  634. if( config.mouseWheel ) {
  635. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  636. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  637. }
  638. else {
  639. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  640. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  641. }
  642. // Rolling 3D links
  643. if( config.rollingLinks ) {
  644. enableRollingLinks();
  645. }
  646. else {
  647. disableRollingLinks();
  648. }
  649. // Iframe link previews
  650. if( config.previewLinks ) {
  651. enablePreviewLinks();
  652. }
  653. else {
  654. disablePreviewLinks();
  655. enablePreviewLinks( '[data-preview-link]' );
  656. }
  657. // Remove existing auto-slide controls
  658. if( autoSlidePlayer ) {
  659. autoSlidePlayer.destroy();
  660. autoSlidePlayer = null;
  661. }
  662. // Generate auto-slide controls if needed
  663. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  664. autoSlidePlayer = new Playback( dom.wrapper, function() {
  665. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  666. } );
  667. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  668. autoSlidePaused = false;
  669. }
  670. // When fragments are turned off they should be visible
  671. if( config.fragments === false ) {
  672. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  673. element.classList.add( 'visible' );
  674. element.classList.remove( 'current-fragment' );
  675. } );
  676. }
  677. // Load the theme in the config, if it's not already loaded
  678. if( config.theme && dom.theme ) {
  679. var themeURL = dom.theme.getAttribute( 'href' );
  680. var themeFinder = /[^\/]*?(?=\.css)/;
  681. var themeName = themeURL.match(themeFinder)[0];
  682. if( config.theme !== themeName ) {
  683. themeURL = themeURL.replace(themeFinder, config.theme);
  684. dom.theme.setAttribute( 'href', themeURL );
  685. }
  686. }
  687. sync();
  688. }
  689. /**
  690. * Binds all event listeners.
  691. */
  692. function addEventListeners() {
  693. eventsAreBound = true;
  694. window.addEventListener( 'hashchange', onWindowHashChange, false );
  695. window.addEventListener( 'resize', onWindowResize, false );
  696. if( config.touch ) {
  697. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  698. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  699. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  700. // Support pointer-style touch interaction as well
  701. if( window.navigator.pointerEnabled ) {
  702. // IE 11 uses un-prefixed version of pointer events
  703. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  704. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  705. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  706. }
  707. else if( window.navigator.msPointerEnabled ) {
  708. // IE 10 uses prefixed version of pointer events
  709. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  710. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  711. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  712. }
  713. }
  714. if( config.keyboard ) {
  715. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  716. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  717. }
  718. if( config.progress && dom.progress ) {
  719. dom.progress.addEventListener( 'click', onProgressClicked, false );
  720. }
  721. if( config.focusBodyOnPageVisibilityChange ) {
  722. var visibilityChange;
  723. if( 'hidden' in document ) {
  724. visibilityChange = 'visibilitychange';
  725. }
  726. else if( 'msHidden' in document ) {
  727. visibilityChange = 'msvisibilitychange';
  728. }
  729. else if( 'webkitHidden' in document ) {
  730. visibilityChange = 'webkitvisibilitychange';
  731. }
  732. if( visibilityChange ) {
  733. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  734. }
  735. }
  736. // Listen to both touch and click events, in case the device
  737. // supports both
  738. var pointerEvents = [ 'touchstart', 'click' ];
  739. // Only support touch for Android, fixes double navigations in
  740. // stock browser
  741. if( navigator.userAgent.match( /android/gi ) ) {
  742. pointerEvents = [ 'touchstart' ];
  743. }
  744. pointerEvents.forEach( function( eventName ) {
  745. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  746. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  747. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  748. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  749. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  750. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  751. } );
  752. }
  753. /**
  754. * Unbinds all event listeners.
  755. */
  756. function removeEventListeners() {
  757. eventsAreBound = false;
  758. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  759. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  760. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  761. window.removeEventListener( 'resize', onWindowResize, false );
  762. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  763. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  764. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  765. // IE11
  766. if( window.navigator.pointerEnabled ) {
  767. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  768. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  769. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  770. }
  771. // IE10
  772. else if( window.navigator.msPointerEnabled ) {
  773. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  774. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  775. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  776. }
  777. if ( config.progress && dom.progress ) {
  778. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  779. }
  780. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  781. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  782. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  783. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  784. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  785. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  786. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  787. } );
  788. }
  789. /**
  790. * Extend object a with the properties of object b.
  791. * If there's a conflict, object b takes precedence.
  792. */
  793. function extend( a, b ) {
  794. for( var i in b ) {
  795. a[ i ] = b[ i ];
  796. }
  797. }
  798. /**
  799. * Converts the target object to an array.
  800. */
  801. function toArray( o ) {
  802. return Array.prototype.slice.call( o );
  803. }
  804. /**
  805. * Utility for deserializing a value.
  806. */
  807. function deserialize( value ) {
  808. if( typeof value === 'string' ) {
  809. if( value === 'null' ) return null;
  810. else if( value === 'true' ) return true;
  811. else if( value === 'false' ) return false;
  812. else if( value.match( /^\d+$/ ) ) return parseFloat( value );
  813. }
  814. return value;
  815. }
  816. /**
  817. * Measures the distance in pixels between point a
  818. * and point b.
  819. *
  820. * @param {Object} a point with x/y properties
  821. * @param {Object} b point with x/y properties
  822. */
  823. function distanceBetween( a, b ) {
  824. var dx = a.x - b.x,
  825. dy = a.y - b.y;
  826. return Math.sqrt( dx*dx + dy*dy );
  827. }
  828. /**
  829. * Applies a CSS transform to the target element.
  830. */
  831. function transformElement( element, transform ) {
  832. element.style.WebkitTransform = transform;
  833. element.style.MozTransform = transform;
  834. element.style.msTransform = transform;
  835. element.style.OTransform = transform;
  836. element.style.transform = transform;
  837. }
  838. /**
  839. * Injects the given CSS styles into the DOM.
  840. */
  841. function injectStyleSheet( value ) {
  842. var tag = document.createElement( 'style' );
  843. tag.type = 'text/css';
  844. if( tag.styleSheet ) {
  845. tag.styleSheet.cssText = value;
  846. }
  847. else {
  848. tag.appendChild( document.createTextNode( value ) );
  849. }
  850. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  851. }
  852. /**
  853. * Measures the distance in pixels between point a and point b.
  854. *
  855. * @param {String} color The string representation of a color,
  856. * the following formats are supported:
  857. * - #000
  858. * - #000000
  859. * - rgb(0,0,0)
  860. */
  861. function colorToRgb( color ) {
  862. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  863. if( hex3 && hex3[1] ) {
  864. hex3 = hex3[1];
  865. return {
  866. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  867. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  868. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  869. };
  870. }
  871. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  872. if( hex6 && hex6[1] ) {
  873. hex6 = hex6[1];
  874. return {
  875. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  876. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  877. b: parseInt( hex6.substr( 4, 2 ), 16 )
  878. };
  879. }
  880. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  881. if( rgb ) {
  882. return {
  883. r: parseInt( rgb[1], 10 ),
  884. g: parseInt( rgb[2], 10 ),
  885. b: parseInt( rgb[3], 10 )
  886. };
  887. }
  888. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  889. if( rgba ) {
  890. return {
  891. r: parseInt( rgba[1], 10 ),
  892. g: parseInt( rgba[2], 10 ),
  893. b: parseInt( rgba[3], 10 ),
  894. a: parseFloat( rgba[4] )
  895. };
  896. }
  897. return null;
  898. }
  899. /**
  900. * Calculates brightness on a scale of 0-255.
  901. *
  902. * @param color See colorStringToRgb for supported formats.
  903. */
  904. function colorBrightness( color ) {
  905. if( typeof color === 'string' ) color = colorToRgb( color );
  906. if( color ) {
  907. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  908. }
  909. return null;
  910. }
  911. /**
  912. * Retrieves the height of the given element by looking
  913. * at the position and height of its immediate children.
  914. */
  915. function getAbsoluteHeight( element ) {
  916. var height = 0;
  917. if( element ) {
  918. var absoluteChildren = 0;
  919. toArray( element.childNodes ).forEach( function( child ) {
  920. if( typeof child.offsetTop === 'number' && child.style ) {
  921. // Count # of abs children
  922. if( window.getComputedStyle( child ).position === 'absolute' ) {
  923. absoluteChildren += 1;
  924. }
  925. height = Math.max( height, child.offsetTop + child.offsetHeight );
  926. }
  927. } );
  928. // If there are no absolute children, use offsetHeight
  929. if( absoluteChildren === 0 ) {
  930. height = element.offsetHeight;
  931. }
  932. }
  933. return height;
  934. }
  935. /**
  936. * Returns the remaining height within the parent of the
  937. * target element.
  938. *
  939. * remaining height = [ configured parent height ] - [ current parent height ]
  940. */
  941. function getRemainingHeight( element, height ) {
  942. height = height || 0;
  943. if( element ) {
  944. var newHeight, oldHeight = element.style.height;
  945. // Change the .stretch element height to 0 in order find the height of all
  946. // the other elements
  947. element.style.height = '0px';
  948. newHeight = height - element.parentNode.offsetHeight;
  949. // Restore the old height, just in case
  950. element.style.height = oldHeight + 'px';
  951. return newHeight;
  952. }
  953. return height;
  954. }
  955. /**
  956. * Checks if this instance is being used to print a PDF.
  957. */
  958. function isPrintingPDF() {
  959. return ( /print-pdf/gi ).test( window.location.search );
  960. }
  961. /**
  962. * Hides the address bar if we're on a mobile device.
  963. */
  964. function hideAddressBar() {
  965. if( config.hideAddressBar && isMobileDevice ) {
  966. // Events that should trigger the address bar to hide
  967. window.addEventListener( 'load', removeAddressBar, false );
  968. window.addEventListener( 'orientationchange', removeAddressBar, false );
  969. }
  970. }
  971. /**
  972. * Causes the address bar to hide on mobile devices,
  973. * more vertical space ftw.
  974. */
  975. function removeAddressBar() {
  976. setTimeout( function() {
  977. window.scrollTo( 0, 1 );
  978. }, 10 );
  979. }
  980. /**
  981. * Dispatches an event of the specified type from the
  982. * reveal DOM element.
  983. */
  984. function dispatchEvent( type, args ) {
  985. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  986. event.initEvent( type, true, true );
  987. extend( event, args );
  988. dom.wrapper.dispatchEvent( event );
  989. // If we're in an iframe, post each reveal.js event to the
  990. // parent window. Used by the notes plugin
  991. if( config.postMessageEvents && window.parent !== window.self ) {
  992. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  993. }
  994. }
  995. /**
  996. * Wrap all links in 3D goodness.
  997. */
  998. function enableRollingLinks() {
  999. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1000. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1001. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1002. var anchor = anchors[i];
  1003. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1004. var span = document.createElement('span');
  1005. span.setAttribute('data-title', anchor.text);
  1006. span.innerHTML = anchor.innerHTML;
  1007. anchor.classList.add( 'roll' );
  1008. anchor.innerHTML = '';
  1009. anchor.appendChild(span);
  1010. }
  1011. }
  1012. }
  1013. }
  1014. /**
  1015. * Unwrap all 3D links.
  1016. */
  1017. function disableRollingLinks() {
  1018. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1019. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1020. var anchor = anchors[i];
  1021. var span = anchor.querySelector( 'span' );
  1022. if( span ) {
  1023. anchor.classList.remove( 'roll' );
  1024. anchor.innerHTML = span.innerHTML;
  1025. }
  1026. }
  1027. }
  1028. /**
  1029. * Bind preview frame links.
  1030. */
  1031. function enablePreviewLinks( selector ) {
  1032. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1033. anchors.forEach( function( element ) {
  1034. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1035. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1036. }
  1037. } );
  1038. }
  1039. /**
  1040. * Unbind preview frame links.
  1041. */
  1042. function disablePreviewLinks() {
  1043. var anchors = toArray( document.querySelectorAll( 'a' ) );
  1044. anchors.forEach( function( element ) {
  1045. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1046. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1047. }
  1048. } );
  1049. }
  1050. /**
  1051. * Opens a preview window for the target URL.
  1052. */
  1053. function showPreview( url ) {
  1054. closeOverlay();
  1055. dom.overlay = document.createElement( 'div' );
  1056. dom.overlay.classList.add( 'overlay' );
  1057. dom.overlay.classList.add( 'overlay-preview' );
  1058. dom.wrapper.appendChild( dom.overlay );
  1059. dom.overlay.innerHTML = [
  1060. '<header>',
  1061. '<a class="close" href="#"><span class="icon"></span></a>',
  1062. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1063. '</header>',
  1064. '<div class="spinner"></div>',
  1065. '<div class="viewport">',
  1066. '<iframe src="'+ url +'"></iframe>',
  1067. '</div>'
  1068. ].join('');
  1069. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1070. dom.overlay.classList.add( 'loaded' );
  1071. }, false );
  1072. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1073. closeOverlay();
  1074. event.preventDefault();
  1075. }, false );
  1076. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1077. closeOverlay();
  1078. }, false );
  1079. setTimeout( function() {
  1080. dom.overlay.classList.add( 'visible' );
  1081. }, 1 );
  1082. }
  1083. /**
  1084. * Opens a overlay window with help material.
  1085. */
  1086. function showHelp() {
  1087. if( config.help ) {
  1088. closeOverlay();
  1089. dom.overlay = document.createElement( 'div' );
  1090. dom.overlay.classList.add( 'overlay' );
  1091. dom.overlay.classList.add( 'overlay-help' );
  1092. dom.wrapper.appendChild( dom.overlay );
  1093. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1094. html += '<table><th>KEY</th><th>ACTION</th>';
  1095. for( var key in keyboardShortcuts ) {
  1096. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1097. }
  1098. html += '</table>';
  1099. dom.overlay.innerHTML = [
  1100. '<header>',
  1101. '<a class="close" href="#"><span class="icon"></span></a>',
  1102. '</header>',
  1103. '<div class="viewport">',
  1104. '<div class="viewport-inner">'+ html +'</div>',
  1105. '</div>'
  1106. ].join('');
  1107. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1108. closeOverlay();
  1109. event.preventDefault();
  1110. }, false );
  1111. setTimeout( function() {
  1112. dom.overlay.classList.add( 'visible' );
  1113. }, 1 );
  1114. }
  1115. }
  1116. /**
  1117. * Closes any currently open overlay.
  1118. */
  1119. function closeOverlay() {
  1120. if( dom.overlay ) {
  1121. dom.overlay.parentNode.removeChild( dom.overlay );
  1122. dom.overlay = null;
  1123. }
  1124. }
  1125. /**
  1126. * Applies JavaScript-controlled layout rules to the
  1127. * presentation.
  1128. */
  1129. function layout() {
  1130. if( dom.wrapper && !isPrintingPDF() ) {
  1131. var size = getComputedSlideSize();
  1132. var slidePadding = 20; // TODO Dig this out of DOM
  1133. // Layout the contents of the slides
  1134. layoutSlideContents( config.width, config.height, slidePadding );
  1135. dom.slides.style.width = size.width + 'px';
  1136. dom.slides.style.height = size.height + 'px';
  1137. // Determine scale of content to fit within available space
  1138. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1139. // Respect max/min scale settings
  1140. scale = Math.max( scale, config.minScale );
  1141. scale = Math.min( scale, config.maxScale );
  1142. // Prefer zooming in desktop Chrome so that content remains crisp
  1143. if( !isMobileDevice && /chrome/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) {
  1144. dom.slides.style.zoom = scale;
  1145. }
  1146. // Apply scale transform as a fallback
  1147. else {
  1148. dom.slides.style.left = '50%';
  1149. dom.slides.style.top = '50%';
  1150. dom.slides.style.bottom = 'auto';
  1151. dom.slides.style.right = 'auto';
  1152. transformElement( dom.slides, 'translate(-50%, -50%) scale('+ scale +')' );
  1153. }
  1154. // Select all slides, vertical and horizontal
  1155. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1156. for( var i = 0, len = slides.length; i < len; i++ ) {
  1157. var slide = slides[ i ];
  1158. // Don't bother updating invisible slides
  1159. if( slide.style.display === 'none' ) {
  1160. continue;
  1161. }
  1162. if( config.center || slide.classList.contains( 'center' ) ) {
  1163. // Vertical stacks are not centred since their section
  1164. // children will be
  1165. if( slide.classList.contains( 'stack' ) ) {
  1166. slide.style.top = 0;
  1167. }
  1168. else {
  1169. slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
  1170. }
  1171. }
  1172. else {
  1173. slide.style.top = '';
  1174. }
  1175. }
  1176. updateProgress();
  1177. updateParallax();
  1178. }
  1179. }
  1180. /**
  1181. * Applies layout logic to the contents of all slides in
  1182. * the presentation.
  1183. */
  1184. function layoutSlideContents( width, height, padding ) {
  1185. // Handle sizing of elements with the 'stretch' class
  1186. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1187. // Determine how much vertical space we can use
  1188. var remainingHeight = getRemainingHeight( element, height );
  1189. // Consider the aspect ratio of media elements
  1190. if( /(img|video)/gi.test( element.nodeName ) ) {
  1191. var nw = element.naturalWidth || element.videoWidth,
  1192. nh = element.naturalHeight || element.videoHeight;
  1193. var es = Math.min( width / nw, remainingHeight / nh );
  1194. element.style.width = ( nw * es ) + 'px';
  1195. element.style.height = ( nh * es ) + 'px';
  1196. }
  1197. else {
  1198. element.style.width = width + 'px';
  1199. element.style.height = remainingHeight + 'px';
  1200. }
  1201. } );
  1202. }
  1203. /**
  1204. * Calculates the computed pixel size of our slides. These
  1205. * values are based on the width and height configuration
  1206. * options.
  1207. */
  1208. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1209. var size = {
  1210. // Slide size
  1211. width: config.width,
  1212. height: config.height,
  1213. // Presentation size
  1214. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1215. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1216. };
  1217. // Reduce available space by margin
  1218. size.presentationWidth -= ( size.presentationHeight * config.margin );
  1219. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1220. // Slide width may be a percentage of available width
  1221. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1222. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1223. }
  1224. // Slide height may be a percentage of available height
  1225. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1226. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1227. }
  1228. return size;
  1229. }
  1230. /**
  1231. * Stores the vertical index of a stack so that the same
  1232. * vertical slide can be selected when navigating to and
  1233. * from the stack.
  1234. *
  1235. * @param {HTMLElement} stack The vertical stack element
  1236. * @param {int} v Index to memorize
  1237. */
  1238. function setPreviousVerticalIndex( stack, v ) {
  1239. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1240. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1241. }
  1242. }
  1243. /**
  1244. * Retrieves the vertical index which was stored using
  1245. * #setPreviousVerticalIndex() or 0 if no previous index
  1246. * exists.
  1247. *
  1248. * @param {HTMLElement} stack The vertical stack element
  1249. */
  1250. function getPreviousVerticalIndex( stack ) {
  1251. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1252. // Prefer manually defined start-indexv
  1253. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1254. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1255. }
  1256. return 0;
  1257. }
  1258. /**
  1259. * Displays the overview of slides (quick nav) by
  1260. * scaling down and arranging all slide elements.
  1261. *
  1262. * Experimental feature, might be dropped if perf
  1263. * can't be improved.
  1264. */
  1265. function activateOverview() {
  1266. // Only proceed if enabled in config
  1267. if( config.overview ) {
  1268. // Don't auto-slide while in overview mode
  1269. cancelAutoSlide();
  1270. var wasActive = dom.wrapper.classList.contains( 'overview' );
  1271. // Vary the depth of the overview based on screen size
  1272. var depth = window.innerWidth < 400 ? 1000 : 2500;
  1273. dom.wrapper.classList.add( 'overview' );
  1274. dom.wrapper.classList.remove( 'overview-deactivating' );
  1275. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1276. for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
  1277. var hslide = horizontalSlides[i],
  1278. hoffset = config.rtl ? -105 : 105;
  1279. hslide.setAttribute( 'data-index-h', i );
  1280. // Apply CSS transform
  1281. transformElement( hslide, 'translateZ(-'+ depth +'px) translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)' );
  1282. if( hslide.classList.contains( 'stack' ) ) {
  1283. var verticalSlides = hslide.querySelectorAll( 'section' );
  1284. for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
  1285. var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );
  1286. var vslide = verticalSlides[j];
  1287. vslide.setAttribute( 'data-index-h', i );
  1288. vslide.setAttribute( 'data-index-v', j );
  1289. // Apply CSS transform
  1290. transformElement( vslide, 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)' );
  1291. // Navigate to this slide on click
  1292. vslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1293. }
  1294. }
  1295. else {
  1296. // Navigate to this slide on click
  1297. hslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1298. }
  1299. }
  1300. updateSlidesVisibility();
  1301. layout();
  1302. if( !wasActive ) {
  1303. // Notify observers of the overview showing
  1304. dispatchEvent( 'overviewshown', {
  1305. 'indexh': indexh,
  1306. 'indexv': indexv,
  1307. 'currentSlide': currentSlide
  1308. } );
  1309. }
  1310. }
  1311. }
  1312. /**
  1313. * Exits the slide overview and enters the currently
  1314. * active slide.
  1315. */
  1316. function deactivateOverview() {
  1317. // Only proceed if enabled in config
  1318. if( config.overview ) {
  1319. dom.wrapper.classList.remove( 'overview' );
  1320. // Temporarily add a class so that transitions can do different things
  1321. // depending on whether they are exiting/entering overview, or just
  1322. // moving from slide to slide
  1323. dom.wrapper.classList.add( 'overview-deactivating' );
  1324. setTimeout( function () {
  1325. dom.wrapper.classList.remove( 'overview-deactivating' );
  1326. }, 1 );
  1327. // Select all slides
  1328. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1329. // Resets all transforms to use the external styles
  1330. transformElement( slide, '' );
  1331. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1332. } );
  1333. slide( indexh, indexv );
  1334. cueAutoSlide();
  1335. // Notify observers of the overview hiding
  1336. dispatchEvent( 'overviewhidden', {
  1337. 'indexh': indexh,
  1338. 'indexv': indexv,
  1339. 'currentSlide': currentSlide
  1340. } );
  1341. }
  1342. }
  1343. /**
  1344. * Toggles the slide overview mode on and off.
  1345. *
  1346. * @param {Boolean} override Optional flag which overrides the
  1347. * toggle logic and forcibly sets the desired state. True means
  1348. * overview is open, false means it's closed.
  1349. */
  1350. function toggleOverview( override ) {
  1351. if( typeof override === 'boolean' ) {
  1352. override ? activateOverview() : deactivateOverview();
  1353. }
  1354. else {
  1355. isOverview() ? deactivateOverview() : activateOverview();
  1356. }
  1357. }
  1358. /**
  1359. * Checks if the overview is currently active.
  1360. *
  1361. * @return {Boolean} true if the overview is active,
  1362. * false otherwise
  1363. */
  1364. function isOverview() {
  1365. return dom.wrapper.classList.contains( 'overview' );
  1366. }
  1367. /**
  1368. * Checks if the current or specified slide is vertical
  1369. * (nested within another slide).
  1370. *
  1371. * @param {HTMLElement} slide [optional] The slide to check
  1372. * orientation of
  1373. */
  1374. function isVerticalSlide( slide ) {
  1375. // Prefer slide argument, otherwise use current slide
  1376. slide = slide ? slide : currentSlide;
  1377. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1378. }
  1379. /**
  1380. * Handling the fullscreen functionality via the fullscreen API
  1381. *
  1382. * @see http://fullscreen.spec.whatwg.org/
  1383. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1384. */
  1385. function enterFullscreen() {
  1386. var element = document.body;
  1387. // Check which implementation is available
  1388. var requestMethod = element.requestFullScreen ||
  1389. element.webkitRequestFullscreen ||
  1390. element.webkitRequestFullScreen ||
  1391. element.mozRequestFullScreen ||
  1392. element.msRequestFullscreen;
  1393. if( requestMethod ) {
  1394. requestMethod.apply( element );
  1395. }
  1396. }
  1397. /**
  1398. * Enters the paused mode which fades everything on screen to
  1399. * black.
  1400. */
  1401. function pause() {
  1402. if( config.pause ) {
  1403. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1404. cancelAutoSlide();
  1405. dom.wrapper.classList.add( 'paused' );
  1406. if( wasPaused === false ) {
  1407. dispatchEvent( 'paused' );
  1408. }
  1409. }
  1410. }
  1411. /**
  1412. * Exits from the paused mode.
  1413. */
  1414. function resume() {
  1415. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1416. dom.wrapper.classList.remove( 'paused' );
  1417. cueAutoSlide();
  1418. if( wasPaused ) {
  1419. dispatchEvent( 'resumed' );
  1420. }
  1421. }
  1422. /**
  1423. * Toggles the paused mode on and off.
  1424. */
  1425. function togglePause( override ) {
  1426. if( typeof override === 'boolean' ) {
  1427. override ? pause() : resume();
  1428. }
  1429. else {
  1430. isPaused() ? resume() : pause();
  1431. }
  1432. }
  1433. /**
  1434. * Checks if we are currently in the paused mode.
  1435. */
  1436. function isPaused() {
  1437. return dom.wrapper.classList.contains( 'paused' );
  1438. }
  1439. /**
  1440. * Toggles the auto slide mode on and off.
  1441. *
  1442. * @param {Boolean} override Optional flag which sets the desired state.
  1443. * True means autoplay starts, false means it stops.
  1444. */
  1445. function toggleAutoSlide( override ) {
  1446. if( typeof override === 'boolean' ) {
  1447. override ? resumeAutoSlide() : pauseAutoSlide();
  1448. }
  1449. else {
  1450. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  1451. }
  1452. }
  1453. /**
  1454. * Checks if the auto slide mode is currently on.
  1455. */
  1456. function isAutoSliding() {
  1457. return !!( autoSlide && !autoSlidePaused );
  1458. }
  1459. /**
  1460. * Steps from the current point in the presentation to the
  1461. * slide which matches the specified horizontal and vertical
  1462. * indices.
  1463. *
  1464. * @param {int} h Horizontal index of the target slide
  1465. * @param {int} v Vertical index of the target slide
  1466. * @param {int} f Optional index of a fragment within the
  1467. * target slide to activate
  1468. * @param {int} o Optional origin for use in multimaster environments
  1469. */
  1470. function slide( h, v, f, o ) {
  1471. // Remember where we were at before
  1472. previousSlide = currentSlide;
  1473. // Query all horizontal slides in the deck
  1474. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1475. // If no vertical index is specified and the upcoming slide is a
  1476. // stack, resume at its previous vertical index
  1477. if( v === undefined ) {
  1478. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1479. }
  1480. // If we were on a vertical stack, remember what vertical index
  1481. // it was on so we can resume at the same position when returning
  1482. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1483. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1484. }
  1485. // Remember the state before this slide
  1486. var stateBefore = state.concat();
  1487. // Reset the state array
  1488. state.length = 0;
  1489. var indexhBefore = indexh || 0,
  1490. indexvBefore = indexv || 0;
  1491. // Activate and transition to the new slide
  1492. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1493. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1494. // Update the visibility of slides now that the indices have changed
  1495. updateSlidesVisibility();
  1496. layout();
  1497. // Apply the new state
  1498. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1499. // Check if this state existed on the previous slide. If it
  1500. // did, we will avoid adding it repeatedly
  1501. for( var j = 0; j < stateBefore.length; j++ ) {
  1502. if( stateBefore[j] === state[i] ) {
  1503. stateBefore.splice( j, 1 );
  1504. continue stateLoop;
  1505. }
  1506. }
  1507. document.documentElement.classList.add( state[i] );
  1508. // Dispatch custom event matching the state's name
  1509. dispatchEvent( state[i] );
  1510. }
  1511. // Clean up the remains of the previous state
  1512. while( stateBefore.length ) {
  1513. document.documentElement.classList.remove( stateBefore.pop() );
  1514. }
  1515. // If the overview is active, re-activate it to update positions
  1516. if( isOverview() ) {
  1517. activateOverview();
  1518. }
  1519. // Find the current horizontal slide and any possible vertical slides
  1520. // within it
  1521. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1522. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1523. // Store references to the previous and current slides
  1524. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1525. // Show fragment, if specified
  1526. if( typeof f !== 'undefined' ) {
  1527. navigateFragment( f );
  1528. }
  1529. // Dispatch an event if the slide changed
  1530. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1531. if( slideChanged ) {
  1532. dispatchEvent( 'slidechanged', {
  1533. 'indexh': indexh,
  1534. 'indexv': indexv,
  1535. 'previousSlide': previousSlide,
  1536. 'currentSlide': currentSlide,
  1537. 'origin': o
  1538. } );
  1539. }
  1540. else {
  1541. // Ensure that the previous slide is never the same as the current
  1542. previousSlide = null;
  1543. }
  1544. // Solves an edge case where the previous slide maintains the
  1545. // 'present' class when navigating between adjacent vertical
  1546. // stacks
  1547. if( previousSlide ) {
  1548. previousSlide.classList.remove( 'present' );
  1549. previousSlide.setAttribute( 'aria-hidden', 'true' );
  1550. // Reset all slides upon navigate to home
  1551. // Issue: #285
  1552. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1553. // Launch async task
  1554. setTimeout( function () {
  1555. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1556. for( i in slides ) {
  1557. if( slides[i] ) {
  1558. // Reset stack
  1559. setPreviousVerticalIndex( slides[i], 0 );
  1560. }
  1561. }
  1562. }, 0 );
  1563. }
  1564. }
  1565. // Handle embedded content
  1566. if( slideChanged || !previousSlide ) {
  1567. stopEmbeddedContent( previousSlide );
  1568. startEmbeddedContent( currentSlide );
  1569. }
  1570. // Announce the current slide contents, for screen readers
  1571. dom.statusDiv.textContent = currentSlide.textContent;
  1572. updateControls();
  1573. updateProgress();
  1574. updateBackground();
  1575. updateParallax();
  1576. updateSlideNumber();
  1577. // Update the URL hash
  1578. writeURL();
  1579. cueAutoSlide();
  1580. }
  1581. /**
  1582. * Syncs the presentation with the current DOM. Useful
  1583. * when new slides or control elements are added or when
  1584. * the configuration has changed.
  1585. */
  1586. function sync() {
  1587. // Subscribe to input
  1588. removeEventListeners();
  1589. addEventListeners();
  1590. // Force a layout to make sure the current config is accounted for
  1591. layout();
  1592. // Reflect the current autoSlide value
  1593. autoSlide = config.autoSlide;
  1594. // Start auto-sliding if it's enabled
  1595. cueAutoSlide();
  1596. // Re-create the slide backgrounds
  1597. createBackgrounds();
  1598. // Write the current hash to the URL
  1599. writeURL();
  1600. sortAllFragments();
  1601. updateControls();
  1602. updateProgress();
  1603. updateBackground( true );
  1604. updateSlideNumber();
  1605. updateSlidesVisibility();
  1606. formatEmbeddedContent();
  1607. }
  1608. /**
  1609. * Resets all vertical slides so that only the first
  1610. * is visible.
  1611. */
  1612. function resetVerticalSlides() {
  1613. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1614. horizontalSlides.forEach( function( horizontalSlide ) {
  1615. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1616. verticalSlides.forEach( function( verticalSlide, y ) {
  1617. if( y > 0 ) {
  1618. verticalSlide.classList.remove( 'present' );
  1619. verticalSlide.classList.remove( 'past' );
  1620. verticalSlide.classList.add( 'future' );
  1621. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  1622. }
  1623. } );
  1624. } );
  1625. }
  1626. /**
  1627. * Sorts and formats all of fragments in the
  1628. * presentation.
  1629. */
  1630. function sortAllFragments() {
  1631. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1632. horizontalSlides.forEach( function( horizontalSlide ) {
  1633. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1634. verticalSlides.forEach( function( verticalSlide, y ) {
  1635. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  1636. } );
  1637. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  1638. } );
  1639. }
  1640. /**
  1641. * Updates one dimension of slides by showing the slide
  1642. * with the specified index.
  1643. *
  1644. * @param {String} selector A CSS selector that will fetch
  1645. * the group of slides we are working with
  1646. * @param {Number} index The index of the slide that should be
  1647. * shown
  1648. *
  1649. * @return {Number} The index of the slide that is now shown,
  1650. * might differ from the passed in index if it was out of
  1651. * bounds.
  1652. */
  1653. function updateSlides( selector, index ) {
  1654. // Select all slides and convert the NodeList result to
  1655. // an array
  1656. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  1657. slidesLength = slides.length;
  1658. var printMode = isPrintingPDF();
  1659. if( slidesLength ) {
  1660. // Should the index loop?
  1661. if( config.loop ) {
  1662. index %= slidesLength;
  1663. if( index < 0 ) {
  1664. index = slidesLength + index;
  1665. }
  1666. }
  1667. // Enforce max and minimum index bounds
  1668. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1669. for( var i = 0; i < slidesLength; i++ ) {
  1670. var element = slides[i];
  1671. var reverse = config.rtl && !isVerticalSlide( element );
  1672. element.classList.remove( 'past' );
  1673. element.classList.remove( 'present' );
  1674. element.classList.remove( 'future' );
  1675. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1676. element.setAttribute( 'hidden', '' );
  1677. element.setAttribute( 'aria-hidden', 'true' );
  1678. // If this element contains vertical slides
  1679. if( element.querySelector( 'section' ) ) {
  1680. element.classList.add( 'stack' );
  1681. }
  1682. // If we're printing static slides, all slides are "present"
  1683. if( printMode ) {
  1684. element.classList.add( 'present' );
  1685. continue;
  1686. }
  1687. if( i < index ) {
  1688. // Any element previous to index is given the 'past' class
  1689. element.classList.add( reverse ? 'future' : 'past' );
  1690. if( config.fragments ) {
  1691. var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
  1692. // Show all fragments on prior slides
  1693. while( pastFragments.length ) {
  1694. var pastFragment = pastFragments.pop();
  1695. pastFragment.classList.add( 'visible' );
  1696. pastFragment.classList.remove( 'current-fragment' );
  1697. }
  1698. }
  1699. }
  1700. else if( i > index ) {
  1701. // Any element subsequent to index is given the 'future' class
  1702. element.classList.add( reverse ? 'past' : 'future' );
  1703. if( config.fragments ) {
  1704. var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1705. // No fragments in future slides should be visible ahead of time
  1706. while( futureFragments.length ) {
  1707. var futureFragment = futureFragments.pop();
  1708. futureFragment.classList.remove( 'visible' );
  1709. futureFragment.classList.remove( 'current-fragment' );
  1710. }
  1711. }
  1712. }
  1713. }
  1714. // Mark the current slide as present
  1715. slides[index].classList.add( 'present' );
  1716. slides[index].removeAttribute( 'hidden' );
  1717. slides[index].removeAttribute( 'aria-hidden' );
  1718. // If this slide has a state associated with it, add it
  1719. // onto the current state of the deck
  1720. var slideState = slides[index].getAttribute( 'data-state' );
  1721. if( slideState ) {
  1722. state = state.concat( slideState.split( ' ' ) );
  1723. }
  1724. }
  1725. else {
  1726. // Since there are no slides we can't be anywhere beyond the
  1727. // zeroth index
  1728. index = 0;
  1729. }
  1730. return index;
  1731. }
  1732. /**
  1733. * Optimization method; hide all slides that are far away
  1734. * from the present slide.
  1735. */
  1736. function updateSlidesVisibility() {
  1737. // Select all slides and convert the NodeList result to
  1738. // an array
  1739. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1740. horizontalSlidesLength = horizontalSlides.length,
  1741. distanceX,
  1742. distanceY;
  1743. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  1744. // The number of steps away from the present slide that will
  1745. // be visible
  1746. var viewDistance = isOverview() ? 10 : config.viewDistance;
  1747. // Limit view distance on weaker devices
  1748. if( isMobileDevice ) {
  1749. viewDistance = isOverview() ? 6 : 2;
  1750. }
  1751. // Limit view distance on weaker devices
  1752. if( isPrintingPDF() ) {
  1753. viewDistance = Number.MAX_VALUE;
  1754. }
  1755. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1756. var horizontalSlide = horizontalSlides[x];
  1757. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1758. verticalSlidesLength = verticalSlides.length;
  1759. // Loops so that it measures 1 between the first and last slides
  1760. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1761. // Show the horizontal slide if it's within the view distance
  1762. if( distanceX < viewDistance ) {
  1763. showSlide( horizontalSlide );
  1764. }
  1765. else {
  1766. hideSlide( horizontalSlide );
  1767. }
  1768. if( verticalSlidesLength ) {
  1769. var oy = getPreviousVerticalIndex( horizontalSlide );
  1770. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1771. var verticalSlide = verticalSlides[y];
  1772. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  1773. if( distanceX + distanceY < viewDistance ) {
  1774. showSlide( verticalSlide );
  1775. }
  1776. else {
  1777. hideSlide( verticalSlide );
  1778. }
  1779. }
  1780. }
  1781. }
  1782. }
  1783. }
  1784. /**
  1785. * Updates the progress bar to reflect the current slide.
  1786. */
  1787. function updateProgress() {
  1788. // Update progress if enabled
  1789. if( config.progress && dom.progressbar ) {
  1790. dom.progressbar.style.width = getProgress() * window.innerWidth + 'px';
  1791. }
  1792. }
  1793. /**
  1794. * Updates the slide number div to reflect the current slide.
  1795. */
  1796. function updateSlideNumber() {
  1797. // Update slide number if enabled
  1798. if( config.slideNumber && dom.slideNumber) {
  1799. // Display the number of the page using 'indexh - indexv' format
  1800. var indexString = indexh;
  1801. if( indexv > 0 ) {
  1802. indexString += ' - ' + indexv;
  1803. }
  1804. dom.slideNumber.innerHTML = indexString;
  1805. }
  1806. }
  1807. /**
  1808. * Updates the state of all control/navigation arrows.
  1809. */
  1810. function updateControls() {
  1811. var routes = availableRoutes();
  1812. var fragments = availableFragments();
  1813. // Remove the 'enabled' class from all directions
  1814. dom.controlsLeft.concat( dom.controlsRight )
  1815. .concat( dom.controlsUp )
  1816. .concat( dom.controlsDown )
  1817. .concat( dom.controlsPrev )
  1818. .concat( dom.controlsNext ).forEach( function( node ) {
  1819. node.classList.remove( 'enabled' );
  1820. node.classList.remove( 'fragmented' );
  1821. } );
  1822. // Add the 'enabled' class to the available routes
  1823. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1824. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1825. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1826. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1827. // Prev/next buttons
  1828. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1829. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1830. // Highlight fragment directions
  1831. if( currentSlide ) {
  1832. // Always apply fragment decorator to prev/next buttons
  1833. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1834. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1835. // Apply fragment decorators to directional buttons based on
  1836. // what slide axis they are in
  1837. if( isVerticalSlide( currentSlide ) ) {
  1838. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1839. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1840. }
  1841. else {
  1842. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1843. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1844. }
  1845. }
  1846. }
  1847. /**
  1848. * Updates the background elements to reflect the current
  1849. * slide.
  1850. *
  1851. * @param {Boolean} includeAll If true, the backgrounds of
  1852. * all vertical slides (not just the present) will be updated.
  1853. */
  1854. function updateBackground( includeAll ) {
  1855. var currentBackground = null;
  1856. // Reverse past/future classes when in RTL mode
  1857. var horizontalPast = config.rtl ? 'future' : 'past',
  1858. horizontalFuture = config.rtl ? 'past' : 'future';
  1859. // Update the classes of all backgrounds to match the
  1860. // states of their slides (past/present/future)
  1861. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  1862. backgroundh.classList.remove( 'past' );
  1863. backgroundh.classList.remove( 'present' );
  1864. backgroundh.classList.remove( 'future' );
  1865. if( h < indexh ) {
  1866. backgroundh.classList.add( horizontalPast );
  1867. }
  1868. else if ( h > indexh ) {
  1869. backgroundh.classList.add( horizontalFuture );
  1870. }
  1871. else {
  1872. backgroundh.classList.add( 'present' );
  1873. // Store a reference to the current background element
  1874. currentBackground = backgroundh;
  1875. }
  1876. if( includeAll || h === indexh ) {
  1877. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  1878. backgroundv.classList.remove( 'past' );
  1879. backgroundv.classList.remove( 'present' );
  1880. backgroundv.classList.remove( 'future' );
  1881. if( v < indexv ) {
  1882. backgroundv.classList.add( 'past' );
  1883. }
  1884. else if ( v > indexv ) {
  1885. backgroundv.classList.add( 'future' );
  1886. }
  1887. else {
  1888. backgroundv.classList.add( 'present' );
  1889. // Only if this is the present horizontal and vertical slide
  1890. if( h === indexh ) currentBackground = backgroundv;
  1891. }
  1892. } );
  1893. }
  1894. } );
  1895. // Stop any currently playing video background
  1896. if( previousBackground ) {
  1897. var previousVideo = previousBackground.querySelector( 'video' );
  1898. if( previousVideo ) previousVideo.pause();
  1899. }
  1900. if( currentBackground ) {
  1901. // Start video playback
  1902. var currentVideo = currentBackground.querySelector( 'video' );
  1903. if( currentVideo ) currentVideo.play();
  1904. // Don't transition between identical backgrounds. This
  1905. // prevents unwanted flicker.
  1906. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  1907. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  1908. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  1909. dom.background.classList.add( 'no-transition' );
  1910. }
  1911. previousBackground = currentBackground;
  1912. }
  1913. // If there's a background brightness flag for this slide,
  1914. // bubble it to the .reveal container
  1915. if( currentSlide ) {
  1916. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  1917. if( currentSlide.classList.contains( classToBubble ) ) {
  1918. dom.wrapper.classList.add( classToBubble );
  1919. }
  1920. else {
  1921. dom.wrapper.classList.remove( classToBubble );
  1922. }
  1923. } );
  1924. }
  1925. // Allow the first background to apply without transition
  1926. setTimeout( function() {
  1927. dom.background.classList.remove( 'no-transition' );
  1928. }, 1 );
  1929. }
  1930. /**
  1931. * Updates the position of the parallax background based
  1932. * on the current slide index.
  1933. */
  1934. function updateParallax() {
  1935. if( config.parallaxBackgroundImage ) {
  1936. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1937. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1938. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  1939. backgroundWidth, backgroundHeight;
  1940. if( backgroundSize.length === 1 ) {
  1941. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  1942. }
  1943. else {
  1944. backgroundWidth = parseInt( backgroundSize[0], 10 );
  1945. backgroundHeight = parseInt( backgroundSize[1], 10 );
  1946. }
  1947. var slideWidth = dom.background.offsetWidth;
  1948. var horizontalSlideCount = horizontalSlides.length;
  1949. var horizontalOffset = -( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) * indexh;
  1950. var slideHeight = dom.background.offsetHeight;
  1951. var verticalSlideCount = verticalSlides.length;
  1952. var verticalOffset = verticalSlideCount > 1 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0;
  1953. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
  1954. }
  1955. }
  1956. /**
  1957. * Called when the given slide is within the configured view
  1958. * distance. Shows the slide element and loads any content
  1959. * that is set to load lazily (data-src).
  1960. */
  1961. function showSlide( slide ) {
  1962. // Show the slide element
  1963. slide.style.display = 'block';
  1964. // Media elements with data-src attributes
  1965. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  1966. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  1967. element.removeAttribute( 'data-src' );
  1968. } );
  1969. // Media elements with <source> children
  1970. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  1971. var sources = 0;
  1972. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  1973. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  1974. source.removeAttribute( 'data-src' );
  1975. sources += 1;
  1976. } );
  1977. // If we rewrote sources for this video/audio element, we need
  1978. // to manually tell it to load from its new origin
  1979. if( sources > 0 ) {
  1980. media.load();
  1981. }
  1982. } );
  1983. // Show the corresponding background element
  1984. var indices = getIndices( slide );
  1985. var background = getSlideBackground( indices.h, indices.v );
  1986. if( background ) {
  1987. background.style.display = 'block';
  1988. // If the background contains media, load it
  1989. if( background.hasAttribute( 'data-loaded' ) === false ) {
  1990. background.setAttribute( 'data-loaded', 'true' );
  1991. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  1992. backgroundVideo = slide.getAttribute( 'data-background-video' );
  1993. // Images
  1994. if( backgroundImage ) {
  1995. background.style.backgroundImage = 'url('+ backgroundImage +')';
  1996. }
  1997. // Videos
  1998. else if ( backgroundVideo ) {
  1999. var video = document.createElement( 'video' );
  2000. // Support comma separated lists of video sources
  2001. backgroundVideo.split( ',' ).forEach( function( source ) {
  2002. video.innerHTML += '<source src="'+ source +'">';
  2003. } );
  2004. background.appendChild( video );
  2005. }
  2006. }
  2007. }
  2008. }
  2009. /**
  2010. * Called when the given slide is moved outside of the
  2011. * configured view distance.
  2012. */
  2013. function hideSlide( slide ) {
  2014. // Hide the slide element
  2015. slide.style.display = 'none';
  2016. // Hide the corresponding background element
  2017. var indices = getIndices( slide );
  2018. var background = getSlideBackground( indices.h, indices.v );
  2019. if( background ) {
  2020. background.style.display = 'none';
  2021. }
  2022. }
  2023. /**
  2024. * Determine what available routes there are for navigation.
  2025. *
  2026. * @return {Object} containing four booleans: left/right/up/down
  2027. */
  2028. function availableRoutes() {
  2029. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2030. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2031. var routes = {
  2032. left: indexh > 0 || config.loop,
  2033. right: indexh < horizontalSlides.length - 1 || config.loop,
  2034. up: indexv > 0,
  2035. down: indexv < verticalSlides.length - 1
  2036. };
  2037. // reverse horizontal controls for rtl
  2038. if( config.rtl ) {
  2039. var left = routes.left;
  2040. routes.left = routes.right;
  2041. routes.right = left;
  2042. }
  2043. return routes;
  2044. }
  2045. /**
  2046. * Returns an object describing the available fragment
  2047. * directions.
  2048. *
  2049. * @return {Object} two boolean properties: prev/next
  2050. */
  2051. function availableFragments() {
  2052. if( currentSlide && config.fragments ) {
  2053. var fragments = currentSlide.querySelectorAll( '.fragment' );
  2054. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  2055. return {
  2056. prev: fragments.length - hiddenFragments.length > 0,
  2057. next: !!hiddenFragments.length
  2058. };
  2059. }
  2060. else {
  2061. return { prev: false, next: false };
  2062. }
  2063. }
  2064. /**
  2065. * Enforces origin-specific format rules for embedded media.
  2066. */
  2067. function formatEmbeddedContent() {
  2068. // YouTube frames must include "?enablejsapi=1"
  2069. toArray( dom.slides.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  2070. var src = el.getAttribute( 'src' );
  2071. if( !/enablejsapi\=1/gi.test( src ) ) {
  2072. el.setAttribute( 'src', src + ( !/\?/.test( src ) ? '?' : '&' ) + 'enablejsapi=1' );
  2073. }
  2074. });
  2075. // Vimeo frames must include "?api=1"
  2076. toArray( dom.slides.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  2077. var src = el.getAttribute( 'src' );
  2078. if( !/api\=1/gi.test( src ) ) {
  2079. el.setAttribute( 'src', src + ( !/\?/.test( src ) ? '?' : '&' ) + 'api=1' );
  2080. }
  2081. });
  2082. }
  2083. /**
  2084. * Start playback of any embedded content inside of
  2085. * the targeted slide.
  2086. */
  2087. function startEmbeddedContent( slide ) {
  2088. if( slide && !isSpeakerNotes() ) {
  2089. // HTML5 media elements
  2090. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2091. if( el.hasAttribute( 'data-autoplay' ) ) {
  2092. el.play();
  2093. }
  2094. } );
  2095. // iframe embeds
  2096. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  2097. el.contentWindow.postMessage( 'slide:start', '*' );
  2098. });
  2099. // YouTube embeds
  2100. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  2101. if( el.hasAttribute( 'data-autoplay' ) ) {
  2102. el.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  2103. }
  2104. });
  2105. // Vimeo embeds
  2106. toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  2107. if( el.hasAttribute( 'data-autoplay' ) ) {
  2108. el.contentWindow.postMessage( '{"method":"play"}', '*' );
  2109. }
  2110. });
  2111. }
  2112. }
  2113. /**
  2114. * Stop playback of any embedded content inside of
  2115. * the targeted slide.
  2116. */
  2117. function stopEmbeddedContent( slide ) {
  2118. if( slide && slide.parentNode ) {
  2119. // HTML5 media elements
  2120. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2121. if( !el.hasAttribute( 'data-ignore' ) ) {
  2122. el.pause();
  2123. }
  2124. } );
  2125. // iframe embeds
  2126. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  2127. el.contentWindow.postMessage( 'slide:stop', '*' );
  2128. });
  2129. // YouTube embeds
  2130. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  2131. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  2132. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  2133. }
  2134. });
  2135. // Vimeo embeds
  2136. toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  2137. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  2138. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  2139. }
  2140. });
  2141. }
  2142. }
  2143. /**
  2144. * Returns a value ranging from 0-1 that represents
  2145. * how far into the presentation we have navigated.
  2146. */
  2147. function getProgress() {
  2148. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2149. // The number of past and total slides
  2150. var totalCount = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  2151. var pastCount = 0;
  2152. // Step through all slides and count the past ones
  2153. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  2154. var horizontalSlide = horizontalSlides[i];
  2155. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2156. for( var j = 0; j < verticalSlides.length; j++ ) {
  2157. // Stop as soon as we arrive at the present
  2158. if( verticalSlides[j].classList.contains( 'present' ) ) {
  2159. break mainLoop;
  2160. }
  2161. pastCount++;
  2162. }
  2163. // Stop as soon as we arrive at the present
  2164. if( horizontalSlide.classList.contains( 'present' ) ) {
  2165. break;
  2166. }
  2167. // Don't count the wrapping section for vertical slides
  2168. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  2169. pastCount++;
  2170. }
  2171. }
  2172. if( currentSlide ) {
  2173. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  2174. // If there are fragments in the current slide those should be
  2175. // accounted for in the progress.
  2176. if( allFragments.length > 0 ) {
  2177. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  2178. // This value represents how big a portion of the slide progress
  2179. // that is made up by its fragments (0-1)
  2180. var fragmentWeight = 0.9;
  2181. // Add fragment progress to the past slide count
  2182. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  2183. }
  2184. }
  2185. return pastCount / ( totalCount - 1 );
  2186. }
  2187. /**
  2188. * Checks if this presentation is running inside of the
  2189. * speaker notes window.
  2190. */
  2191. function isSpeakerNotes() {
  2192. return !!window.location.search.match( /receiver/gi );
  2193. }
  2194. /**
  2195. * Reads the current URL (hash) and navigates accordingly.
  2196. */
  2197. function readURL() {
  2198. var hash = window.location.hash;
  2199. // Attempt to parse the hash as either an index or name
  2200. var bits = hash.slice( 2 ).split( '/' ),
  2201. name = hash.replace( /#|\//gi, '' );
  2202. // If the first bit is invalid and there is a name we can
  2203. // assume that this is a named link
  2204. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  2205. var element;
  2206. // Ensure the named link is a valid HTML ID attribute
  2207. if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) {
  2208. // Find the slide with the specified ID
  2209. element = document.querySelector( '#' + name );
  2210. }
  2211. if( element ) {
  2212. // Find the position of the named slide and navigate to it
  2213. var indices = Reveal.getIndices( element );
  2214. slide( indices.h, indices.v );
  2215. }
  2216. // If the slide doesn't exist, navigate to the current slide
  2217. else {
  2218. slide( indexh || 0, indexv || 0 );
  2219. }
  2220. }
  2221. else {
  2222. // Read the index components of the hash
  2223. var h = parseInt( bits[0], 10 ) || 0,
  2224. v = parseInt( bits[1], 10 ) || 0;
  2225. if( h !== indexh || v !== indexv ) {
  2226. slide( h, v );
  2227. }
  2228. }
  2229. }
  2230. /**
  2231. * Updates the page URL (hash) to reflect the current
  2232. * state.
  2233. *
  2234. * @param {Number} delay The time in ms to wait before
  2235. * writing the hash
  2236. */
  2237. function writeURL( delay ) {
  2238. if( config.history ) {
  2239. // Make sure there's never more than one timeout running
  2240. clearTimeout( writeURLTimeout );
  2241. // If a delay is specified, timeout this call
  2242. if( typeof delay === 'number' ) {
  2243. writeURLTimeout = setTimeout( writeURL, delay );
  2244. }
  2245. else if( currentSlide ) {
  2246. var url = '/';
  2247. // Attempt to create a named link based on the slide's ID
  2248. var id = currentSlide.getAttribute( 'id' );
  2249. if( id ) {
  2250. id = id.toLowerCase();
  2251. id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
  2252. }
  2253. // If the current slide has an ID, use that as a named link
  2254. if( typeof id === 'string' && id.length ) {
  2255. url = '/' + id;
  2256. }
  2257. // Otherwise use the /h/v index
  2258. else {
  2259. if( indexh > 0 || indexv > 0 ) url += indexh;
  2260. if( indexv > 0 ) url += '/' + indexv;
  2261. }
  2262. window.location.hash = url;
  2263. }
  2264. }
  2265. }
  2266. /**
  2267. * Retrieves the h/v location of the current, or specified,
  2268. * slide.
  2269. *
  2270. * @param {HTMLElement} slide If specified, the returned
  2271. * index will be for this slide rather than the currently
  2272. * active one
  2273. *
  2274. * @return {Object} { h: <int>, v: <int>, f: <int> }
  2275. */
  2276. function getIndices( slide ) {
  2277. // By default, return the current indices
  2278. var h = indexh,
  2279. v = indexv,
  2280. f;
  2281. // If a slide is specified, return the indices of that slide
  2282. if( slide ) {
  2283. var isVertical = isVerticalSlide( slide );
  2284. var slideh = isVertical ? slide.parentNode : slide;
  2285. // Select all horizontal slides
  2286. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2287. // Now that we know which the horizontal slide is, get its index
  2288. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  2289. // Assume we're not vertical
  2290. v = undefined;
  2291. // If this is a vertical slide, grab the vertical index
  2292. if( isVertical ) {
  2293. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  2294. }
  2295. }
  2296. if( !slide && currentSlide ) {
  2297. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  2298. if( hasFragments ) {
  2299. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2300. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  2301. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  2302. }
  2303. else {
  2304. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  2305. }
  2306. }
  2307. }
  2308. return { h: h, v: v, f: f };
  2309. }
  2310. /**
  2311. * Retrieves the total number of slides in this presentation.
  2312. */
  2313. function getTotalSlides() {
  2314. return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  2315. }
  2316. /**
  2317. * Returns the slide element matching the specified index.
  2318. */
  2319. function getSlide( x, y ) {
  2320. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2321. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2322. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  2323. return verticalSlides ? verticalSlides[ y ] : undefined;
  2324. }
  2325. return horizontalSlide;
  2326. }
  2327. /**
  2328. * Returns the background element for the given slide.
  2329. * All slides, even the ones with no background properties
  2330. * defined, have a background element so as long as the
  2331. * index is valid an element will be returned.
  2332. */
  2333. function getSlideBackground( x, y ) {
  2334. // When printing to PDF the slide backgrounds are nested
  2335. // inside of the slides
  2336. if( isPrintingPDF() ) {
  2337. var slide = getSlide( x, y );
  2338. if( slide ) {
  2339. var background = slide.querySelector( '.slide-background' );
  2340. if( background && background.parentNode === slide ) {
  2341. return background;
  2342. }
  2343. }
  2344. return undefined;
  2345. }
  2346. var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
  2347. var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
  2348. if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
  2349. return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
  2350. }
  2351. return horizontalBackground;
  2352. }
  2353. /**
  2354. * Retrieves the current state of the presentation as
  2355. * an object. This state can then be restored at any
  2356. * time.
  2357. */
  2358. function getState() {
  2359. var indices = getIndices();
  2360. return {
  2361. indexh: indices.h,
  2362. indexv: indices.v,
  2363. indexf: indices.f,
  2364. paused: isPaused(),
  2365. overview: isOverview()
  2366. };
  2367. }
  2368. /**
  2369. * Restores the presentation to the given state.
  2370. *
  2371. * @param {Object} state As generated by getState()
  2372. */
  2373. function setState( state ) {
  2374. if( typeof state === 'object' ) {
  2375. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  2376. var pausedFlag = deserialize( state.paused ),
  2377. overviewFlag = deserialize( state.overview );
  2378. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  2379. togglePause( pausedFlag );
  2380. }
  2381. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  2382. toggleOverview( overviewFlag );
  2383. }
  2384. }
  2385. }
  2386. /**
  2387. * Return a sorted fragments list, ordered by an increasing
  2388. * "data-fragment-index" attribute.
  2389. *
  2390. * Fragments will be revealed in the order that they are returned by
  2391. * this function, so you can use the index attributes to control the
  2392. * order of fragment appearance.
  2393. *
  2394. * To maintain a sensible default fragment order, fragments are presumed
  2395. * to be passed in document order. This function adds a "fragment-index"
  2396. * attribute to each node if such an attribute is not already present,
  2397. * and sets that attribute to an integer value which is the position of
  2398. * the fragment within the fragments list.
  2399. */
  2400. function sortFragments( fragments ) {
  2401. fragments = toArray( fragments );
  2402. var ordered = [],
  2403. unordered = [],
  2404. sorted = [];
  2405. // Group ordered and unordered elements
  2406. fragments.forEach( function( fragment, i ) {
  2407. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  2408. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  2409. if( !ordered[index] ) {
  2410. ordered[index] = [];
  2411. }
  2412. ordered[index].push( fragment );
  2413. }
  2414. else {
  2415. unordered.push( [ fragment ] );
  2416. }
  2417. } );
  2418. // Append fragments without explicit indices in their
  2419. // DOM order
  2420. ordered = ordered.concat( unordered );
  2421. // Manually count the index up per group to ensure there
  2422. // are no gaps
  2423. var index = 0;
  2424. // Push all fragments in their sorted order to an array,
  2425. // this flattens the groups
  2426. ordered.forEach( function( group ) {
  2427. group.forEach( function( fragment ) {
  2428. sorted.push( fragment );
  2429. fragment.setAttribute( 'data-fragment-index', index );
  2430. } );
  2431. index ++;
  2432. } );
  2433. return sorted;
  2434. }
  2435. /**
  2436. * Navigate to the specified slide fragment.
  2437. *
  2438. * @param {Number} index The index of the fragment that
  2439. * should be shown, -1 means all are invisible
  2440. * @param {Number} offset Integer offset to apply to the
  2441. * fragment index
  2442. *
  2443. * @return {Boolean} true if a change was made in any
  2444. * fragments visibility as part of this call
  2445. */
  2446. function navigateFragment( index, offset ) {
  2447. if( currentSlide && config.fragments ) {
  2448. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  2449. if( fragments.length ) {
  2450. // If no index is specified, find the current
  2451. if( typeof index !== 'number' ) {
  2452. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  2453. if( lastVisibleFragment ) {
  2454. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  2455. }
  2456. else {
  2457. index = -1;
  2458. }
  2459. }
  2460. // If an offset is specified, apply it to the index
  2461. if( typeof offset === 'number' ) {
  2462. index += offset;
  2463. }
  2464. var fragmentsShown = [],
  2465. fragmentsHidden = [];
  2466. toArray( fragments ).forEach( function( element, i ) {
  2467. if( element.hasAttribute( 'data-fragment-index' ) ) {
  2468. i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
  2469. }
  2470. // Visible fragments
  2471. if( i <= index ) {
  2472. if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
  2473. element.classList.add( 'visible' );
  2474. element.classList.remove( 'current-fragment' );
  2475. // Announce the fragments one by one to the Screen Reader
  2476. dom.statusDiv.innerHTML = element.textContent;
  2477. if( i === index ) {
  2478. element.classList.add( 'current-fragment' );
  2479. }
  2480. }
  2481. // Hidden fragments
  2482. else {
  2483. if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
  2484. element.classList.remove( 'visible' );
  2485. element.classList.remove( 'current-fragment' );
  2486. }
  2487. } );
  2488. if( fragmentsHidden.length ) {
  2489. dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
  2490. }
  2491. if( fragmentsShown.length ) {
  2492. dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
  2493. }
  2494. updateControls();
  2495. updateProgress();
  2496. return !!( fragmentsShown.length || fragmentsHidden.length );
  2497. }
  2498. }
  2499. return false;
  2500. }
  2501. /**
  2502. * Navigate to the next slide fragment.
  2503. *
  2504. * @return {Boolean} true if there was a next fragment,
  2505. * false otherwise
  2506. */
  2507. function nextFragment() {
  2508. return navigateFragment( null, 1 );
  2509. }
  2510. /**
  2511. * Navigate to the previous slide fragment.
  2512. *
  2513. * @return {Boolean} true if there was a previous fragment,
  2514. * false otherwise
  2515. */
  2516. function previousFragment() {
  2517. return navigateFragment( null, -1 );
  2518. }
  2519. /**
  2520. * Cues a new automated slide if enabled in the config.
  2521. */
  2522. function cueAutoSlide() {
  2523. cancelAutoSlide();
  2524. if( currentSlide ) {
  2525. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2526. var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null;
  2527. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  2528. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  2529. // Pick value in the following priority order:
  2530. // 1. Current fragment's data-autoslide
  2531. // 2. Current slide's data-autoslide
  2532. // 3. Parent slide's data-autoslide
  2533. // 4. Global autoSlide setting
  2534. if( fragmentAutoSlide ) {
  2535. autoSlide = parseInt( fragmentAutoSlide, 10 );
  2536. }
  2537. else if( slideAutoSlide ) {
  2538. autoSlide = parseInt( slideAutoSlide, 10 );
  2539. }
  2540. else if( parentAutoSlide ) {
  2541. autoSlide = parseInt( parentAutoSlide, 10 );
  2542. }
  2543. else {
  2544. autoSlide = config.autoSlide;
  2545. }
  2546. // If there are media elements with data-autoplay,
  2547. // automatically set the autoSlide duration to the
  2548. // length of that media
  2549. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2550. if( el.hasAttribute( 'data-autoplay' ) ) {
  2551. if( autoSlide && el.duration * 1000 > autoSlide ) {
  2552. autoSlide = ( el.duration * 1000 ) + 1000;
  2553. }
  2554. }
  2555. } );
  2556. // Cue the next auto-slide if:
  2557. // - There is an autoSlide value
  2558. // - Auto-sliding isn't paused by the user
  2559. // - The presentation isn't paused
  2560. // - The overview isn't active
  2561. // - The presentation isn't over
  2562. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  2563. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  2564. autoSlideStartTime = Date.now();
  2565. }
  2566. if( autoSlidePlayer ) {
  2567. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  2568. }
  2569. }
  2570. }
  2571. /**
  2572. * Cancels any ongoing request to auto-slide.
  2573. */
  2574. function cancelAutoSlide() {
  2575. clearTimeout( autoSlideTimeout );
  2576. autoSlideTimeout = -1;
  2577. }
  2578. function pauseAutoSlide() {
  2579. if( autoSlide && !autoSlidePaused ) {
  2580. autoSlidePaused = true;
  2581. dispatchEvent( 'autoslidepaused' );
  2582. clearTimeout( autoSlideTimeout );
  2583. if( autoSlidePlayer ) {
  2584. autoSlidePlayer.setPlaying( false );
  2585. }
  2586. }
  2587. }
  2588. function resumeAutoSlide() {
  2589. if( autoSlide && autoSlidePaused ) {
  2590. autoSlidePaused = false;
  2591. dispatchEvent( 'autoslideresumed' );
  2592. cueAutoSlide();
  2593. }
  2594. }
  2595. function navigateLeft() {
  2596. // Reverse for RTL
  2597. if( config.rtl ) {
  2598. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  2599. slide( indexh + 1 );
  2600. }
  2601. }
  2602. // Normal navigation
  2603. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  2604. slide( indexh - 1 );
  2605. }
  2606. }
  2607. function navigateRight() {
  2608. // Reverse for RTL
  2609. if( config.rtl ) {
  2610. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  2611. slide( indexh - 1 );
  2612. }
  2613. }
  2614. // Normal navigation
  2615. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  2616. slide( indexh + 1 );
  2617. }
  2618. }
  2619. function navigateUp() {
  2620. // Prioritize hiding fragments
  2621. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  2622. slide( indexh, indexv - 1 );
  2623. }
  2624. }
  2625. function navigateDown() {
  2626. // Prioritize revealing fragments
  2627. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  2628. slide( indexh, indexv + 1 );
  2629. }
  2630. }
  2631. /**
  2632. * Navigates backwards, prioritized in the following order:
  2633. * 1) Previous fragment
  2634. * 2) Previous vertical slide
  2635. * 3) Previous horizontal slide
  2636. */
  2637. function navigatePrev() {
  2638. // Prioritize revealing fragments
  2639. if( previousFragment() === false ) {
  2640. if( availableRoutes().up ) {
  2641. navigateUp();
  2642. }
  2643. else {
  2644. // Fetch the previous horizontal slide, if there is one
  2645. var previousSlide = dom.wrapper.querySelector( HORIZONTAL_SLIDES_SELECTOR + '.past:nth-child(' + indexh + ')' );
  2646. if( previousSlide ) {
  2647. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  2648. var h = indexh - 1;
  2649. slide( h, v );
  2650. }
  2651. }
  2652. }
  2653. }
  2654. /**
  2655. * Same as #navigatePrev() but navigates forwards.
  2656. */
  2657. function navigateNext() {
  2658. // Prioritize revealing fragments
  2659. if( nextFragment() === false ) {
  2660. availableRoutes().down ? navigateDown() : navigateRight();
  2661. }
  2662. // If auto-sliding is enabled we need to cue up
  2663. // another timeout
  2664. cueAutoSlide();
  2665. }
  2666. // --------------------------------------------------------------------//
  2667. // ----------------------------- EVENTS -------------------------------//
  2668. // --------------------------------------------------------------------//
  2669. /**
  2670. * Called by all event handlers that are based on user
  2671. * input.
  2672. */
  2673. function onUserInput( event ) {
  2674. if( config.autoSlideStoppable ) {
  2675. pauseAutoSlide();
  2676. }
  2677. }
  2678. /**
  2679. * Handler for the document level 'keypress' event.
  2680. */
  2681. function onDocumentKeyPress( event ) {
  2682. // Check if the pressed key is question mark
  2683. if( event.shiftKey && event.charCode === 63 ) {
  2684. if( dom.overlay ) {
  2685. closeOverlay();
  2686. }
  2687. else {
  2688. showHelp( true );
  2689. }
  2690. }
  2691. }
  2692. /**
  2693. * Handler for the document level 'keydown' event.
  2694. */
  2695. function onDocumentKeyDown( event ) {
  2696. // If there's a condition specified and it returns false,
  2697. // ignore this event
  2698. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
  2699. return true;
  2700. }
  2701. // Remember if auto-sliding was paused so we can toggle it
  2702. var autoSlideWasPaused = autoSlidePaused;
  2703. onUserInput( event );
  2704. // Check if there's a focused element that could be using
  2705. // the keyboard
  2706. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  2707. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  2708. // Disregard the event if there's a focused element or a
  2709. // keyboard modifier key is present
  2710. if( activeElementIsCE || activeElementIsInput || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  2711. // While paused only allow "unpausing" keyboard events (b and .)
  2712. if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) {
  2713. return false;
  2714. }
  2715. var triggered = false;
  2716. // 1. User defined key bindings
  2717. if( typeof config.keyboard === 'object' ) {
  2718. for( var key in config.keyboard ) {
  2719. // Check if this binding matches the pressed key
  2720. if( parseInt( key, 10 ) === event.keyCode ) {
  2721. var value = config.keyboard[ key ];
  2722. // Callback function
  2723. if( typeof value === 'function' ) {
  2724. value.apply( null, [ event ] );
  2725. }
  2726. // String shortcuts to reveal.js API
  2727. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  2728. Reveal[ value ].call();
  2729. }
  2730. triggered = true;
  2731. }
  2732. }
  2733. }
  2734. // 2. System defined key bindings
  2735. if( triggered === false ) {
  2736. // Assume true and try to prove false
  2737. triggered = true;
  2738. switch( event.keyCode ) {
  2739. // p, page up
  2740. case 80: case 33: navigatePrev(); break;
  2741. // n, page down
  2742. case 78: case 34: navigateNext(); break;
  2743. // h, left
  2744. case 72: case 37: navigateLeft(); break;
  2745. // l, right
  2746. case 76: case 39: navigateRight(); break;
  2747. // k, up
  2748. case 75: case 38: navigateUp(); break;
  2749. // j, down
  2750. case 74: case 40: navigateDown(); break;
  2751. // home
  2752. case 36: slide( 0 ); break;
  2753. // end
  2754. case 35: slide( Number.MAX_VALUE ); break;
  2755. // space
  2756. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  2757. // return
  2758. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  2759. // two-spot, semicolon, b, period, Logitech presenter tools "black screen" button
  2760. case 58: case 59: case 66: case 190: case 191: togglePause(); break;
  2761. // f
  2762. case 70: enterFullscreen(); break;
  2763. // a
  2764. case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
  2765. default:
  2766. triggered = false;
  2767. }
  2768. }
  2769. // If the input resulted in a triggered action we should prevent
  2770. // the browsers default behavior
  2771. if( triggered ) {
  2772. event.preventDefault && event.preventDefault();
  2773. }
  2774. // ESC or O key
  2775. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  2776. if( dom.overlay ) {
  2777. closeOverlay();
  2778. }
  2779. else {
  2780. toggleOverview();
  2781. }
  2782. event.preventDefault && event.preventDefault();
  2783. }
  2784. // If auto-sliding is enabled we need to cue up
  2785. // another timeout
  2786. cueAutoSlide();
  2787. }
  2788. /**
  2789. * Handler for the 'touchstart' event, enables support for
  2790. * swipe and pinch gestures.
  2791. */
  2792. function onTouchStart( event ) {
  2793. touch.startX = event.touches[0].clientX;
  2794. touch.startY = event.touches[0].clientY;
  2795. touch.startCount = event.touches.length;
  2796. // If there's two touches we need to memorize the distance
  2797. // between those two points to detect pinching
  2798. if( event.touches.length === 2 && config.overview ) {
  2799. touch.startSpan = distanceBetween( {
  2800. x: event.touches[1].clientX,
  2801. y: event.touches[1].clientY
  2802. }, {
  2803. x: touch.startX,
  2804. y: touch.startY
  2805. } );
  2806. }
  2807. }
  2808. /**
  2809. * Handler for the 'touchmove' event.
  2810. */
  2811. function onTouchMove( event ) {
  2812. // Each touch should only trigger one action
  2813. if( !touch.captured ) {
  2814. onUserInput( event );
  2815. var currentX = event.touches[0].clientX;
  2816. var currentY = event.touches[0].clientY;
  2817. // If the touch started with two points and still has
  2818. // two active touches; test for the pinch gesture
  2819. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  2820. // The current distance in pixels between the two touch points
  2821. var currentSpan = distanceBetween( {
  2822. x: event.touches[1].clientX,
  2823. y: event.touches[1].clientY
  2824. }, {
  2825. x: touch.startX,
  2826. y: touch.startY
  2827. } );
  2828. // If the span is larger than the desire amount we've got
  2829. // ourselves a pinch
  2830. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  2831. touch.captured = true;
  2832. if( currentSpan < touch.startSpan ) {
  2833. activateOverview();
  2834. }
  2835. else {
  2836. deactivateOverview();
  2837. }
  2838. }
  2839. event.preventDefault();
  2840. }
  2841. // There was only one touch point, look for a swipe
  2842. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  2843. var deltaX = currentX - touch.startX,
  2844. deltaY = currentY - touch.startY;
  2845. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2846. touch.captured = true;
  2847. navigateLeft();
  2848. }
  2849. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2850. touch.captured = true;
  2851. navigateRight();
  2852. }
  2853. else if( deltaY > touch.threshold ) {
  2854. touch.captured = true;
  2855. navigateUp();
  2856. }
  2857. else if( deltaY < -touch.threshold ) {
  2858. touch.captured = true;
  2859. navigateDown();
  2860. }
  2861. // If we're embedded, only block touch events if they have
  2862. // triggered an action
  2863. if( config.embedded ) {
  2864. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  2865. event.preventDefault();
  2866. }
  2867. }
  2868. // Not embedded? Block them all to avoid needless tossing
  2869. // around of the viewport in iOS
  2870. else {
  2871. event.preventDefault();
  2872. }
  2873. }
  2874. }
  2875. // There's a bug with swiping on some Android devices unless
  2876. // the default action is always prevented
  2877. else if( navigator.userAgent.match( /android/gi ) ) {
  2878. event.preventDefault();
  2879. }
  2880. }
  2881. /**
  2882. * Handler for the 'touchend' event.
  2883. */
  2884. function onTouchEnd( event ) {
  2885. touch.captured = false;
  2886. }
  2887. /**
  2888. * Convert pointer down to touch start.
  2889. */
  2890. function onPointerDown( event ) {
  2891. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2892. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2893. onTouchStart( event );
  2894. }
  2895. }
  2896. /**
  2897. * Convert pointer move to touch move.
  2898. */
  2899. function onPointerMove( event ) {
  2900. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2901. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2902. onTouchMove( event );
  2903. }
  2904. }
  2905. /**
  2906. * Convert pointer up to touch end.
  2907. */
  2908. function onPointerUp( event ) {
  2909. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2910. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2911. onTouchEnd( event );
  2912. }
  2913. }
  2914. /**
  2915. * Handles mouse wheel scrolling, throttled to avoid skipping
  2916. * multiple slides.
  2917. */
  2918. function onDocumentMouseScroll( event ) {
  2919. if( Date.now() - lastMouseWheelStep > 600 ) {
  2920. lastMouseWheelStep = Date.now();
  2921. var delta = event.detail || -event.wheelDelta;
  2922. if( delta > 0 ) {
  2923. navigateNext();
  2924. }
  2925. else {
  2926. navigatePrev();
  2927. }
  2928. }
  2929. }
  2930. /**
  2931. * Clicking on the progress bar results in a navigation to the
  2932. * closest approximate horizontal slide using this equation:
  2933. *
  2934. * ( clickX / presentationWidth ) * numberOfSlides
  2935. */
  2936. function onProgressClicked( event ) {
  2937. onUserInput( event );
  2938. event.preventDefault();
  2939. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  2940. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  2941. slide( slideIndex );
  2942. }
  2943. /**
  2944. * Event handler for navigation control buttons.
  2945. */
  2946. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  2947. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  2948. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  2949. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  2950. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  2951. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  2952. /**
  2953. * Handler for the window level 'hashchange' event.
  2954. */
  2955. function onWindowHashChange( event ) {
  2956. readURL();
  2957. }
  2958. /**
  2959. * Handler for the window level 'resize' event.
  2960. */
  2961. function onWindowResize( event ) {
  2962. layout();
  2963. }
  2964. /**
  2965. * Handle for the window level 'visibilitychange' event.
  2966. */
  2967. function onPageVisibilityChange( event ) {
  2968. var isHidden = document.webkitHidden ||
  2969. document.msHidden ||
  2970. document.hidden;
  2971. // If, after clicking a link or similar and we're coming back,
  2972. // focus the document.body to ensure we can use keyboard shortcuts
  2973. if( isHidden === false && document.activeElement !== document.body ) {
  2974. document.activeElement.blur();
  2975. document.body.focus();
  2976. }
  2977. }
  2978. /**
  2979. * Invoked when a slide is and we're in the overview.
  2980. */
  2981. function onOverviewSlideClicked( event ) {
  2982. // TODO There's a bug here where the event listeners are not
  2983. // removed after deactivating the overview.
  2984. if( eventsAreBound && isOverview() ) {
  2985. event.preventDefault();
  2986. var element = event.target;
  2987. while( element && !element.nodeName.match( /section/gi ) ) {
  2988. element = element.parentNode;
  2989. }
  2990. if( element && !element.classList.contains( 'disabled' ) ) {
  2991. deactivateOverview();
  2992. if( element.nodeName.match( /section/gi ) ) {
  2993. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  2994. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  2995. slide( h, v );
  2996. }
  2997. }
  2998. }
  2999. }
  3000. /**
  3001. * Handles clicks on links that are set to preview in the
  3002. * iframe overlay.
  3003. */
  3004. function onPreviewLinkClicked( event ) {
  3005. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  3006. var url = event.currentTarget.getAttribute( 'href' );
  3007. if( url ) {
  3008. showPreview( url );
  3009. event.preventDefault();
  3010. }
  3011. }
  3012. }
  3013. /**
  3014. * Handles click on the auto-sliding controls element.
  3015. */
  3016. function onAutoSlidePlayerClick( event ) {
  3017. // Replay
  3018. if( Reveal.isLastSlide() && config.loop === false ) {
  3019. slide( 0, 0 );
  3020. resumeAutoSlide();
  3021. }
  3022. // Resume
  3023. else if( autoSlidePaused ) {
  3024. resumeAutoSlide();
  3025. }
  3026. // Pause
  3027. else {
  3028. pauseAutoSlide();
  3029. }
  3030. }
  3031. // --------------------------------------------------------------------//
  3032. // ------------------------ PLAYBACK COMPONENT ------------------------//
  3033. // --------------------------------------------------------------------//
  3034. /**
  3035. * Constructor for the playback component, which displays
  3036. * play/pause/progress controls.
  3037. *
  3038. * @param {HTMLElement} container The component will append
  3039. * itself to this
  3040. * @param {Function} progressCheck A method which will be
  3041. * called frequently to get the current progress on a range
  3042. * of 0-1
  3043. */
  3044. function Playback( container, progressCheck ) {
  3045. // Cosmetics
  3046. this.diameter = 50;
  3047. this.thickness = 3;
  3048. // Flags if we are currently playing
  3049. this.playing = false;
  3050. // Current progress on a 0-1 range
  3051. this.progress = 0;
  3052. // Used to loop the animation smoothly
  3053. this.progressOffset = 1;
  3054. this.container = container;
  3055. this.progressCheck = progressCheck;
  3056. this.canvas = document.createElement( 'canvas' );
  3057. this.canvas.className = 'playback';
  3058. this.canvas.width = this.diameter;
  3059. this.canvas.height = this.diameter;
  3060. this.context = this.canvas.getContext( '2d' );
  3061. this.container.appendChild( this.canvas );
  3062. this.render();
  3063. }
  3064. Playback.prototype.setPlaying = function( value ) {
  3065. var wasPlaying = this.playing;
  3066. this.playing = value;
  3067. // Start repainting if we weren't already
  3068. if( !wasPlaying && this.playing ) {
  3069. this.animate();
  3070. }
  3071. else {
  3072. this.render();
  3073. }
  3074. };
  3075. Playback.prototype.animate = function() {
  3076. var progressBefore = this.progress;
  3077. this.progress = this.progressCheck();
  3078. // When we loop, offset the progress so that it eases
  3079. // smoothly rather than immediately resetting
  3080. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  3081. this.progressOffset = this.progress;
  3082. }
  3083. this.render();
  3084. if( this.playing ) {
  3085. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  3086. }
  3087. };
  3088. /**
  3089. * Renders the current progress and playback state.
  3090. */
  3091. Playback.prototype.render = function() {
  3092. var progress = this.playing ? this.progress : 0,
  3093. radius = ( this.diameter / 2 ) - this.thickness,
  3094. x = this.diameter / 2,
  3095. y = this.diameter / 2,
  3096. iconSize = 14;
  3097. // Ease towards 1
  3098. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  3099. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  3100. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  3101. this.context.save();
  3102. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  3103. // Solid background color
  3104. this.context.beginPath();
  3105. this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false );
  3106. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  3107. this.context.fill();
  3108. // Draw progress track
  3109. this.context.beginPath();
  3110. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  3111. this.context.lineWidth = this.thickness;
  3112. this.context.strokeStyle = '#666';
  3113. this.context.stroke();
  3114. if( this.playing ) {
  3115. // Draw progress on top of track
  3116. this.context.beginPath();
  3117. this.context.arc( x, y, radius, startAngle, endAngle, false );
  3118. this.context.lineWidth = this.thickness;
  3119. this.context.strokeStyle = '#fff';
  3120. this.context.stroke();
  3121. }
  3122. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  3123. // Draw play/pause icons
  3124. if( this.playing ) {
  3125. this.context.fillStyle = '#fff';
  3126. this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize );
  3127. this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize );
  3128. }
  3129. else {
  3130. this.context.beginPath();
  3131. this.context.translate( 2, 0 );
  3132. this.context.moveTo( 0, 0 );
  3133. this.context.lineTo( iconSize - 2, iconSize / 2 );
  3134. this.context.lineTo( 0, iconSize );
  3135. this.context.fillStyle = '#fff';
  3136. this.context.fill();
  3137. }
  3138. this.context.restore();
  3139. };
  3140. Playback.prototype.on = function( type, listener ) {
  3141. this.canvas.addEventListener( type, listener, false );
  3142. };
  3143. Playback.prototype.off = function( type, listener ) {
  3144. this.canvas.removeEventListener( type, listener, false );
  3145. };
  3146. Playback.prototype.destroy = function() {
  3147. this.playing = false;
  3148. if( this.canvas.parentNode ) {
  3149. this.container.removeChild( this.canvas );
  3150. }
  3151. };
  3152. // --------------------------------------------------------------------//
  3153. // ------------------------------- API --------------------------------//
  3154. // --------------------------------------------------------------------//
  3155. Reveal = {
  3156. initialize: initialize,
  3157. configure: configure,
  3158. sync: sync,
  3159. // Navigation methods
  3160. slide: slide,
  3161. left: navigateLeft,
  3162. right: navigateRight,
  3163. up: navigateUp,
  3164. down: navigateDown,
  3165. prev: navigatePrev,
  3166. next: navigateNext,
  3167. // Fragment methods
  3168. navigateFragment: navigateFragment,
  3169. prevFragment: previousFragment,
  3170. nextFragment: nextFragment,
  3171. // Deprecated aliases
  3172. navigateTo: slide,
  3173. navigateLeft: navigateLeft,
  3174. navigateRight: navigateRight,
  3175. navigateUp: navigateUp,
  3176. navigateDown: navigateDown,
  3177. navigatePrev: navigatePrev,
  3178. navigateNext: navigateNext,
  3179. // Forces an update in slide layout
  3180. layout: layout,
  3181. // Returns an object with the available routes as booleans (left/right/top/bottom)
  3182. availableRoutes: availableRoutes,
  3183. // Returns an object with the available fragments as booleans (prev/next)
  3184. availableFragments: availableFragments,
  3185. // Toggles the overview mode on/off
  3186. toggleOverview: toggleOverview,
  3187. // Toggles the "black screen" mode on/off
  3188. togglePause: togglePause,
  3189. // Toggles the auto slide mode on/off
  3190. toggleAutoSlide: toggleAutoSlide,
  3191. // State checks
  3192. isOverview: isOverview,
  3193. isPaused: isPaused,
  3194. isAutoSliding: isAutoSliding,
  3195. // Adds or removes all internal event listeners (such as keyboard)
  3196. addEventListeners: addEventListeners,
  3197. removeEventListeners: removeEventListeners,
  3198. // Facility for persisting and restoring the presentation state
  3199. getState: getState,
  3200. setState: setState,
  3201. // Presentation progress on range of 0-1
  3202. getProgress: getProgress,
  3203. // Returns the indices of the current, or specified, slide
  3204. getIndices: getIndices,
  3205. getTotalSlides: getTotalSlides,
  3206. // Returns the slide element at the specified index
  3207. getSlide: getSlide,
  3208. // Returns the slide background element at the specified index
  3209. getSlideBackground: getSlideBackground,
  3210. // Returns the previous slide element, may be null
  3211. getPreviousSlide: function() {
  3212. return previousSlide;
  3213. },
  3214. // Returns the current slide element
  3215. getCurrentSlide: function() {
  3216. return currentSlide;
  3217. },
  3218. // Returns the current scale of the presentation content
  3219. getScale: function() {
  3220. return scale;
  3221. },
  3222. // Returns the current configuration object
  3223. getConfig: function() {
  3224. return config;
  3225. },
  3226. // Helper method, retrieves query string as a key/value hash
  3227. getQueryHash: function() {
  3228. var query = {};
  3229. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  3230. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  3231. } );
  3232. // Basic deserialization
  3233. for( var i in query ) {
  3234. var value = query[ i ];
  3235. query[ i ] = deserialize( unescape( value ) );
  3236. }
  3237. return query;
  3238. },
  3239. // Returns true if we're currently on the first slide
  3240. isFirstSlide: function() {
  3241. return ( indexh === 0 && indexv === 0 );
  3242. },
  3243. // Returns true if we're currently on the last slide
  3244. isLastSlide: function() {
  3245. if( currentSlide ) {
  3246. // Does this slide has next a sibling?
  3247. if( currentSlide.nextElementSibling ) return false;
  3248. // If it's vertical, does its parent have a next sibling?
  3249. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  3250. return true;
  3251. }
  3252. return false;
  3253. },
  3254. // Checks if reveal.js has been loaded and is ready for use
  3255. isReady: function() {
  3256. return loaded;
  3257. },
  3258. // Forward event binding to the reveal DOM element
  3259. addEventListener: function( type, listener, useCapture ) {
  3260. if( 'addEventListener' in window ) {
  3261. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  3262. }
  3263. },
  3264. removeEventListener: function( type, listener, useCapture ) {
  3265. if( 'addEventListener' in window ) {
  3266. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  3267. }
  3268. },
  3269. // Programatically triggers a keyboard event
  3270. triggerKey: function( keyCode ) {
  3271. onDocumentKeyDown( { keyCode: keyCode } );
  3272. }
  3273. };
  3274. return Reveal;
  3275. }));