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