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