reveal.js 101 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. var Reveal = (function(){
  9. 'use strict';
  10. var SLIDES_SELECTOR = '.reveal .slides section',
  11. HORIZONTAL_SLIDES_SELECTOR = '.reveal .slides>section',
  12. VERTICAL_SLIDES_SELECTOR = '.reveal .slides>section.present>section',
  13. HOME_SLIDE_SELECTOR = '.reveal .slides>section:first-of-type',
  14. // Configurations defaults, can be overridden at initialization time
  15. config = {
  16. // The "normal" size of the presentation, aspect ratio will be preserved
  17. // when the presentation is scaled to fit different resolutions
  18. width: 960,
  19. height: 700,
  20. // Factor of the display size that should remain empty around the content
  21. margin: 0.1,
  22. // Bounds for smallest/largest possible scale to apply to content
  23. minScale: 0.2,
  24. maxScale: 1.0,
  25. // Display controls in the bottom right corner
  26. controls: true,
  27. // Display a presentation progress bar
  28. progress: true,
  29. // Display the page number of the current slide
  30. slideNumber: false,
  31. // Push each slide change to the browser history
  32. history: false,
  33. // Enable keyboard shortcuts for navigation
  34. keyboard: true,
  35. // Optional function that blocks keyboard events when retuning false
  36. keyboardCondition: null,
  37. // Enable the slide overview mode
  38. overview: true,
  39. // Vertical centering of slides
  40. center: true,
  41. // Enables touch navigation on devices with touch input
  42. touch: true,
  43. // Loop the presentation
  44. loop: false,
  45. // Change the presentation direction to be RTL
  46. rtl: false,
  47. // Turns fragments on and off globally
  48. fragments: true,
  49. // Flags if the presentation is running in an embedded mode,
  50. // i.e. contained within a limited portion of the screen
  51. embedded: false,
  52. // Number of milliseconds between automatically proceeding to the
  53. // next slide, disabled when set to 0, this value can be overwritten
  54. // by using a data-autoslide attribute on your slides
  55. autoSlide: 0,
  56. // Stop auto-sliding after user input
  57. autoSlideStoppable: true,
  58. // Enable slide navigation via mouse wheel
  59. mouseWheel: false,
  60. // Apply a 3D roll to links on hover
  61. rollingLinks: false,
  62. // Hides the address bar on mobile devices
  63. hideAddressBar: true,
  64. // Opens links in an iframe preview overlay
  65. previewLinks: false,
  66. // Exposes the reveal.js API through window.postMessage
  67. postMessage: true,
  68. // Dispatches all reveal.js events to the parent window through postMessage
  69. postMessageEvents: false,
  70. // Focuses body when page changes visiblity to ensure keyboard shortcuts work
  71. focusBodyOnPageVisiblityChange: true,
  72. // Theme (see /css/theme)
  73. theme: null,
  74. // Transition style
  75. transition: 'default', // none/fade/slide/convex/concave/zoom
  76. // Transition speed
  77. transitionSpeed: 'default', // default/fast/slow
  78. // Transition style for full page slide backgrounds
  79. backgroundTransition: 'default', // none/fade/slide/convex/concave/zoom
  80. // Parallax background image
  81. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  82. // Parallax background size
  83. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  84. // Number of slides away from the current that are visible
  85. viewDistance: 3,
  86. // Script dependencies to load
  87. dependencies: []
  88. },
  89. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  90. loaded = false,
  91. // The horizontal and vertical index of the currently active slide
  92. indexh,
  93. indexv,
  94. // The previous and current slide HTML elements
  95. previousSlide,
  96. currentSlide,
  97. previousBackground,
  98. // Slides may hold a data-state attribute which we pick up and apply
  99. // as a class to the body. This list contains the combined state of
  100. // all current slides.
  101. state = [],
  102. // The current scale of the presentation (see width/height config)
  103. scale = 1,
  104. // Cached references to DOM elements
  105. dom = {},
  106. // Features supported by the browser, see #checkCapabilities()
  107. features = {},
  108. // Client is a mobile device, see #checkCapabilities()
  109. isMobileDevice,
  110. // Throttles mouse wheel navigation
  111. lastMouseWheelStep = 0,
  112. // Delays updates to the URL due to a Chrome thumbnailer bug
  113. writeURLTimeout = 0,
  114. // Flags if the interaction event listeners are bound
  115. eventsAreBound = false,
  116. // The current auto-slide duration
  117. autoSlide = 0,
  118. // Auto slide properties
  119. autoSlidePlayer,
  120. autoSlideTimeout = 0,
  121. autoSlideStartTime = -1,
  122. autoSlidePaused = false,
  123. // Holds information about the currently ongoing touch input
  124. touch = {
  125. startX: 0,
  126. startY: 0,
  127. startSpan: 0,
  128. startCount: 0,
  129. captured: false,
  130. threshold: 40
  131. };
  132. /**
  133. * Starts up the presentation if the client is capable.
  134. */
  135. function initialize( options ) {
  136. checkCapabilities();
  137. if( !features.transforms2d && !features.transforms3d ) {
  138. document.body.setAttribute( 'class', 'no-transforms' );
  139. // If the browser doesn't support core features we won't be
  140. // using JavaScript to control the presentation
  141. return;
  142. }
  143. // Force a layout when the whole page, incl fonts, has loaded
  144. window.addEventListener( 'load', layout, false );
  145. var query = Reveal.getQueryHash();
  146. // Do not accept new dependencies via query config to avoid
  147. // the potential of malicious script injection
  148. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  149. // Copy options over to our config object
  150. extend( config, options );
  151. extend( config, query );
  152. // Hide the address bar in mobile browsers
  153. hideAddressBar();
  154. // Loads the dependencies and continues to #start() once done
  155. load();
  156. }
  157. /**
  158. * Inspect the client to see what it's capable of, this
  159. * should only happens once per runtime.
  160. */
  161. function checkCapabilities() {
  162. features.transforms3d = 'WebkitPerspective' in document.body.style ||
  163. 'MozPerspective' in document.body.style ||
  164. 'msPerspective' in document.body.style ||
  165. 'OPerspective' in document.body.style ||
  166. 'perspective' in document.body.style;
  167. features.transforms2d = 'WebkitTransform' in document.body.style ||
  168. 'MozTransform' in document.body.style ||
  169. 'msTransform' in document.body.style ||
  170. 'OTransform' in document.body.style ||
  171. 'transform' in document.body.style;
  172. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  173. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  174. features.canvas = !!document.createElement( 'canvas' ).getContext;
  175. isMobileDevice = navigator.userAgent.match( /(iphone|ipod|android)/gi );
  176. }
  177. /**
  178. * Loads the dependencies of reveal.js. Dependencies are
  179. * defined via the configuration option 'dependencies'
  180. * and will be loaded prior to starting/binding reveal.js.
  181. * Some dependencies may have an 'async' flag, if so they
  182. * will load after reveal.js has been started up.
  183. */
  184. function load() {
  185. var scripts = [],
  186. scriptsAsync = [],
  187. scriptsToPreload = 0;
  188. // Called once synchronous scripts finish loading
  189. function proceed() {
  190. if( scriptsAsync.length ) {
  191. // Load asynchronous scripts
  192. head.js.apply( null, scriptsAsync );
  193. }
  194. start();
  195. }
  196. function loadScript( s ) {
  197. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
  198. // Extension may contain callback functions
  199. if( typeof s.callback === 'function' ) {
  200. s.callback.apply( this );
  201. }
  202. if( --scriptsToPreload === 0 ) {
  203. proceed();
  204. }
  205. });
  206. }
  207. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  208. var s = config.dependencies[i];
  209. // Load if there's no condition or the condition is truthy
  210. if( !s.condition || s.condition() ) {
  211. if( s.async ) {
  212. scriptsAsync.push( s.src );
  213. }
  214. else {
  215. scripts.push( s.src );
  216. }
  217. loadScript( s );
  218. }
  219. }
  220. if( scripts.length ) {
  221. scriptsToPreload = scripts.length;
  222. // Load synchronous scripts
  223. head.js.apply( null, scripts );
  224. }
  225. else {
  226. proceed();
  227. }
  228. }
  229. /**
  230. * Starts up reveal.js by binding input events and navigating
  231. * to the current URL deeplink if there is one.
  232. */
  233. function start() {
  234. // Make sure we've got all the DOM elements we need
  235. setupDOM();
  236. // Listen to messages posted to this window
  237. setupPostMessage();
  238. // Resets all vertical slides so that only the first is visible
  239. resetVerticalSlides();
  240. // Updates the presentation to match the current configuration values
  241. configure();
  242. // Read the initial hash
  243. readURL();
  244. // Update all backgrounds
  245. updateBackground( true );
  246. // Special setup and config is required when printing to PDF
  247. if( isPrintingPDF() ) {
  248. removeEventListeners();
  249. setupPDF();
  250. }
  251. // Notify listeners that the presentation is ready but use a 1ms
  252. // timeout to ensure it's not fired synchronously after #initialize()
  253. setTimeout( function() {
  254. // Enable transitions now that we're loaded
  255. dom.slides.classList.remove( 'no-transition' );
  256. loaded = true;
  257. dispatchEvent( 'ready', {
  258. 'indexh': indexh,
  259. 'indexv': indexv,
  260. 'currentSlide': currentSlide
  261. } );
  262. }, 1 );
  263. }
  264. /**
  265. * Finds and stores references to DOM elements which are
  266. * required by the presentation. If a required element is
  267. * not found, it is created.
  268. */
  269. function setupDOM() {
  270. // Cache references to key DOM elements
  271. dom.theme = document.querySelector( '#theme' );
  272. dom.wrapper = document.querySelector( '.reveal' );
  273. dom.slides = document.querySelector( '.reveal .slides' );
  274. // Prevent transitions while we're loading
  275. dom.slides.classList.add( 'no-transition' );
  276. // Background element
  277. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  278. // Progress bar
  279. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  280. dom.progressbar = dom.progress.querySelector( 'span' );
  281. // Arrow controls
  282. createSingletonNode( dom.wrapper, 'aside', 'controls',
  283. '<div class="navigate-left"></div>' +
  284. '<div class="navigate-right"></div>' +
  285. '<div class="navigate-up"></div>' +
  286. '<div class="navigate-down"></div>' );
  287. // Slide number
  288. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  289. // State background element [DEPRECATED]
  290. createSingletonNode( dom.wrapper, 'div', 'state-background', null );
  291. // Overlay graphic which is displayed during the paused mode
  292. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  293. // Cache references to elements
  294. dom.controls = document.querySelector( '.reveal .controls' );
  295. // There can be multiple instances of controls throughout the page
  296. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  297. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  298. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  299. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  300. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  301. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  302. }
  303. /**
  304. * Configures the presentation for printing to a static
  305. * PDF.
  306. */
  307. function setupPDF() {
  308. // The aspect ratio of pages when saving to PDF in Chrome,
  309. // we need to abide by this ratio when determining the pixel
  310. // size of our pages
  311. var pageAspectRatio = 1.295;
  312. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  313. // Dimensions of the PDF pages
  314. var pageWidth = Math.round( slideSize.width * ( 1 + config.margin ) ),
  315. pageHeight = Math.round( pageWidth / pageAspectRatio );
  316. // Dimensions of slides within the pages
  317. var slideWidth = slideSize.width,
  318. slideHeight = slideSize.height;
  319. document.body.classList.add( 'print-pdf' );
  320. document.body.style.width = pageWidth + 'px';
  321. document.body.style.height = pageHeight + 'px';
  322. // Slide and slide background layout
  323. toArray( document.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  324. // Vertical stacks are not centred since their section
  325. // children will be
  326. if( slide.classList.contains( 'stack' ) === false ) {
  327. // Center the slide inside of the page, giving the slide some margin
  328. var left = ( pageWidth - slideWidth ) / 2,
  329. top = ( pageHeight - slideHeight ) / 2;
  330. var contentHeight = getAbsoluteHeight( slide );
  331. var numberOfPages = Math.ceil( contentHeight / pageHeight );
  332. // Center slides vertically
  333. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  334. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  335. }
  336. // Position the slide inside of the page
  337. slide.style.left = left + 'px';
  338. slide.style.top = top + 'px';
  339. slide.style.width = slideWidth + 'px';
  340. // TODO Backgrounds need to be multiplied when the slide
  341. // stretches over multiple pages
  342. var background = slide.querySelector( '.slide-background' );
  343. if( background ) {
  344. background.style.width = pageWidth + 'px';
  345. background.style.height = ( pageHeight * numberOfPages ) + 'px';
  346. background.style.top = -top + 'px';
  347. background.style.left = -left + 'px';
  348. }
  349. }
  350. } );
  351. // Show all fragments
  352. toArray( document.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
  353. fragment.classList.add( 'visible' );
  354. } );
  355. }
  356. /**
  357. * Creates an HTML element and returns a reference to it.
  358. * If the element already exists the existing instance will
  359. * be returned.
  360. */
  361. function createSingletonNode( container, tagname, classname, innerHTML ) {
  362. var node = container.querySelector( '.' + classname );
  363. if( !node ) {
  364. node = document.createElement( tagname );
  365. node.classList.add( classname );
  366. if( innerHTML !== null ) {
  367. node.innerHTML = innerHTML;
  368. }
  369. container.appendChild( node );
  370. }
  371. return node;
  372. }
  373. /**
  374. * Creates the slide background elements and appends them
  375. * to the background container. One element is created per
  376. * slide no matter if the given slide has visible background.
  377. */
  378. function createBackgrounds() {
  379. var printMode = isPrintingPDF();
  380. // Clear prior backgrounds
  381. dom.background.innerHTML = '';
  382. dom.background.classList.add( 'no-transition' );
  383. // Iterate over all horizontal slides
  384. toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  385. var backgroundStack;
  386. if( printMode ) {
  387. backgroundStack = createBackground( slideh, slideh );
  388. }
  389. else {
  390. backgroundStack = createBackground( slideh, dom.background );
  391. }
  392. // Iterate over all vertical slides
  393. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  394. if( printMode ) {
  395. createBackground( slidev, slidev );
  396. }
  397. else {
  398. createBackground( slidev, backgroundStack );
  399. }
  400. } );
  401. } );
  402. // Add parallax background if specified
  403. if( config.parallaxBackgroundImage ) {
  404. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  405. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  406. // Make sure the below properties are set on the element - these properties are
  407. // needed for proper transitions to be set on the element via CSS. To remove
  408. // annoying background slide-in effect when the presentation starts, apply
  409. // these properties after short time delay
  410. setTimeout( function() {
  411. dom.wrapper.classList.add( 'has-parallax-background' );
  412. }, 1 );
  413. }
  414. else {
  415. dom.background.style.backgroundImage = '';
  416. dom.wrapper.classList.remove( 'has-parallax-background' );
  417. }
  418. }
  419. /**
  420. * Creates a background for the given slide.
  421. *
  422. * @param {HTMLElement} slide
  423. * @param {HTMLElement} container The element that the background
  424. * should be appended to
  425. */
  426. function createBackground( slide, container ) {
  427. var data = {
  428. background: slide.getAttribute( 'data-background' ),
  429. backgroundSize: slide.getAttribute( 'data-background-size' ),
  430. backgroundImage: slide.getAttribute( 'data-background-image' ),
  431. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  432. backgroundColor: slide.getAttribute( 'data-background-color' ),
  433. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  434. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  435. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  436. };
  437. var element = document.createElement( 'div' );
  438. // Carry over custom classes from the slide to the background
  439. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  440. if( data.background ) {
  441. // Auto-wrap image urls in url(...)
  442. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
  443. element.style.backgroundImage = 'url('+ data.background +')';
  444. }
  445. else {
  446. element.style.background = data.background;
  447. }
  448. }
  449. // Create a hash for this combination of background settings.
  450. // This is used to determine when two slide backgrounds are
  451. // the same.
  452. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo ) {
  453. element.setAttribute( 'data-background-hash', data.background +
  454. data.backgroundSize +
  455. data.backgroundImage +
  456. data.backgroundVideo +
  457. data.backgroundColor +
  458. data.backgroundRepeat +
  459. data.backgroundPosition +
  460. data.backgroundTransition );
  461. }
  462. // Additional and optional background properties
  463. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  464. if( data.backgroundImage ) element.style.backgroundImage = 'url("' + data.backgroundImage + '")';
  465. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  466. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  467. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  468. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  469. // Create video background element
  470. if( data.backgroundVideo ) {
  471. var video = document.createElement( 'video' );
  472. // Support comma separated lists of video sources
  473. data.backgroundVideo.split( ',' ).forEach( function( source ) {
  474. video.innerHTML += '<source src="'+ source +'">';
  475. } );
  476. element.appendChild( video );
  477. }
  478. container.appendChild( element );
  479. return element;
  480. }
  481. /**
  482. * Registers a listener to postMessage events, this makes it
  483. * possible to call all reveal.js API methods from another
  484. * window. For example:
  485. *
  486. * revealWindow.postMessage( JSON.stringify({
  487. * method: 'slide',
  488. * args: [ 2 ]
  489. * }), '*' );
  490. */
  491. function setupPostMessage() {
  492. if( config.postMessage ) {
  493. window.addEventListener( 'message', function ( event ) {
  494. var data = event.data;
  495. // Make sure we're dealing with JSON
  496. if( data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  497. data = JSON.parse( data );
  498. // Check if the requested method can be found
  499. if( data.method && typeof Reveal[data.method] === 'function' ) {
  500. Reveal[data.method].apply( Reveal, data.args );
  501. }
  502. }
  503. }, false );
  504. }
  505. }
  506. /**
  507. * Applies the configuration settings from the config
  508. * object. May be called multiple times.
  509. */
  510. function configure( options ) {
  511. var numberOfSlides = document.querySelectorAll( SLIDES_SELECTOR ).length;
  512. dom.wrapper.classList.remove( config.transition );
  513. // New config options may be passed when this method
  514. // is invoked through the API after initialization
  515. if( typeof options === 'object' ) extend( config, options );
  516. // Force linear transition based on browser capabilities
  517. if( features.transforms3d === false ) config.transition = 'linear';
  518. dom.wrapper.classList.add( config.transition );
  519. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  520. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  521. dom.controls.style.display = config.controls ? 'block' : 'none';
  522. dom.progress.style.display = config.progress ? 'block' : 'none';
  523. if( config.rtl ) {
  524. dom.wrapper.classList.add( 'rtl' );
  525. }
  526. else {
  527. dom.wrapper.classList.remove( 'rtl' );
  528. }
  529. if( config.center ) {
  530. dom.wrapper.classList.add( 'center' );
  531. }
  532. else {
  533. dom.wrapper.classList.remove( 'center' );
  534. }
  535. if( config.mouseWheel ) {
  536. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  537. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  538. }
  539. else {
  540. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  541. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  542. }
  543. // Rolling 3D links
  544. if( config.rollingLinks ) {
  545. enableRollingLinks();
  546. }
  547. else {
  548. disableRollingLinks();
  549. }
  550. // Iframe link previews
  551. if( config.previewLinks ) {
  552. enablePreviewLinks();
  553. }
  554. else {
  555. disablePreviewLinks();
  556. enablePreviewLinks( '[data-preview-link]' );
  557. }
  558. // Remove existing auto-slide controls
  559. if( autoSlidePlayer ) {
  560. autoSlidePlayer.destroy();
  561. autoSlidePlayer = null;
  562. }
  563. // Generate auto-slide controls if needed
  564. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  565. autoSlidePlayer = new Playback( dom.wrapper, function() {
  566. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  567. } );
  568. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  569. autoSlidePaused = false;
  570. }
  571. // When fragments are turned off they should be visible
  572. if( config.fragments === false ) {
  573. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  574. element.classList.add( 'visible' );
  575. element.classList.remove( 'current-fragment' );
  576. } );
  577. }
  578. // Load the theme in the config, if it's not already loaded
  579. if( config.theme && dom.theme ) {
  580. var themeURL = dom.theme.getAttribute( 'href' );
  581. var themeFinder = /[^\/]*?(?=\.css)/;
  582. var themeName = themeURL.match(themeFinder)[0];
  583. if( config.theme !== themeName ) {
  584. themeURL = themeURL.replace(themeFinder, config.theme);
  585. dom.theme.setAttribute( 'href', themeURL );
  586. }
  587. }
  588. sync();
  589. }
  590. /**
  591. * Binds all event listeners.
  592. */
  593. function addEventListeners() {
  594. eventsAreBound = true;
  595. window.addEventListener( 'hashchange', onWindowHashChange, false );
  596. window.addEventListener( 'resize', onWindowResize, false );
  597. if( config.touch ) {
  598. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  599. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  600. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  601. // Support pointer-style touch interaction as well
  602. if( window.navigator.pointerEnabled ) {
  603. // IE 11 uses un-prefixed version of pointer events
  604. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  605. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  606. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  607. }
  608. else if( window.navigator.msPointerEnabled ) {
  609. // IE 10 uses prefixed version of pointer events
  610. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  611. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  612. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  613. }
  614. }
  615. if( config.keyboard ) {
  616. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  617. }
  618. if( config.progress && dom.progress ) {
  619. dom.progress.addEventListener( 'click', onProgressClicked, false );
  620. }
  621. if( config.focusBodyOnPageVisiblityChange ) {
  622. var visibilityChange;
  623. if( 'hidden' in document ) {
  624. visibilityChange = 'visibilitychange';
  625. }
  626. else if( 'msHidden' in document ) {
  627. visibilityChange = 'msvisibilitychange';
  628. }
  629. else if( 'webkitHidden' in document ) {
  630. visibilityChange = 'webkitvisibilitychange';
  631. }
  632. if( visibilityChange ) {
  633. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  634. }
  635. }
  636. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  637. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  638. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  639. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  640. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  641. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  642. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  643. } );
  644. }
  645. /**
  646. * Unbinds all event listeners.
  647. */
  648. function removeEventListeners() {
  649. eventsAreBound = false;
  650. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  651. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  652. window.removeEventListener( 'resize', onWindowResize, false );
  653. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  654. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  655. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  656. // IE11
  657. if( window.navigator.pointerEnabled ) {
  658. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  659. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  660. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  661. }
  662. // IE10
  663. else if( window.navigator.msPointerEnabled ) {
  664. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  665. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  666. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  667. }
  668. if ( config.progress && dom.progress ) {
  669. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  670. }
  671. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  672. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  673. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  674. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  675. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  676. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  677. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  678. } );
  679. }
  680. /**
  681. * Extend object a with the properties of object b.
  682. * If there's a conflict, object b takes precedence.
  683. */
  684. function extend( a, b ) {
  685. for( var i in b ) {
  686. a[ i ] = b[ i ];
  687. }
  688. }
  689. /**
  690. * Converts the target object to an array.
  691. */
  692. function toArray( o ) {
  693. return Array.prototype.slice.call( o );
  694. }
  695. /**
  696. * Utility for deserializing a value.
  697. */
  698. function deserialize( value ) {
  699. if( typeof value === 'string' ) {
  700. if( value === 'null' ) return null;
  701. else if( value === 'true' ) return true;
  702. else if( value === 'false' ) return false;
  703. else if( value.match( /^\d+$/ ) ) return parseFloat( value );
  704. }
  705. return value;
  706. }
  707. /**
  708. * Measures the distance in pixels between point a
  709. * and point b.
  710. *
  711. * @param {Object} a point with x/y properties
  712. * @param {Object} b point with x/y properties
  713. */
  714. function distanceBetween( a, b ) {
  715. var dx = a.x - b.x,
  716. dy = a.y - b.y;
  717. return Math.sqrt( dx*dx + dy*dy );
  718. }
  719. /**
  720. * Applies a CSS transform to the target element.
  721. */
  722. function transformElement( element, transform ) {
  723. element.style.WebkitTransform = transform;
  724. element.style.MozTransform = transform;
  725. element.style.msTransform = transform;
  726. element.style.OTransform = transform;
  727. element.style.transform = transform;
  728. }
  729. /**
  730. * Retrieves the height of the given element by looking
  731. * at the position and height of its immediate children.
  732. */
  733. function getAbsoluteHeight( element ) {
  734. var height = 0;
  735. if( element ) {
  736. var absoluteChildren = 0;
  737. toArray( element.childNodes ).forEach( function( child ) {
  738. if( typeof child.offsetTop === 'number' && child.style ) {
  739. // Count # of abs children
  740. if( window.getComputedStyle( child ).position === 'absolute' ) {
  741. absoluteChildren += 1;
  742. }
  743. height = Math.max( height, child.offsetTop + child.offsetHeight );
  744. }
  745. } );
  746. // If there are no absolute children, use offsetHeight
  747. if( absoluteChildren === 0 ) {
  748. height = element.offsetHeight;
  749. }
  750. }
  751. return height;
  752. }
  753. /**
  754. * Returns the remaining height within the parent of the
  755. * target element.
  756. *
  757. * remaining height = [ configured parent height ] - [ current parent height ]
  758. */
  759. function getRemainingHeight( element, height ) {
  760. height = height || 0;
  761. if( element ) {
  762. var newHeight, oldHeight = element.style.height;
  763. // Change the .stretch element height to 0 in order find the height of all
  764. // the other elements
  765. element.style.height = '0px';
  766. newHeight = height - element.parentNode.offsetHeight;
  767. // Restore the old height, just in case
  768. element.style.height = oldHeight + 'px';
  769. return newHeight;
  770. }
  771. return height;
  772. }
  773. /**
  774. * Checks if this instance is being used to print a PDF.
  775. */
  776. function isPrintingPDF() {
  777. return ( /print-pdf/gi ).test( window.location.search );
  778. }
  779. /**
  780. * Hides the address bar if we're on a mobile device.
  781. */
  782. function hideAddressBar() {
  783. if( config.hideAddressBar && isMobileDevice ) {
  784. // Events that should trigger the address bar to hide
  785. window.addEventListener( 'load', removeAddressBar, false );
  786. window.addEventListener( 'orientationchange', removeAddressBar, false );
  787. }
  788. }
  789. /**
  790. * Causes the address bar to hide on mobile devices,
  791. * more vertical space ftw.
  792. */
  793. function removeAddressBar() {
  794. setTimeout( function() {
  795. window.scrollTo( 0, 1 );
  796. }, 10 );
  797. }
  798. /**
  799. * Dispatches an event of the specified type from the
  800. * reveal DOM element.
  801. */
  802. function dispatchEvent( type, args ) {
  803. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  804. event.initEvent( type, true, true );
  805. extend( event, args );
  806. dom.wrapper.dispatchEvent( event );
  807. // If we're in an iframe, post each reveal.js event to the
  808. // parent window. Used by the notes plugin
  809. if( config.postMessageEvents && window.parent !== window.self ) {
  810. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  811. }
  812. }
  813. /**
  814. * Wrap all links in 3D goodness.
  815. */
  816. function enableRollingLinks() {
  817. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  818. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a' );
  819. for( var i = 0, len = anchors.length; i < len; i++ ) {
  820. var anchor = anchors[i];
  821. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  822. var span = document.createElement('span');
  823. span.setAttribute('data-title', anchor.text);
  824. span.innerHTML = anchor.innerHTML;
  825. anchor.classList.add( 'roll' );
  826. anchor.innerHTML = '';
  827. anchor.appendChild(span);
  828. }
  829. }
  830. }
  831. }
  832. /**
  833. * Unwrap all 3D links.
  834. */
  835. function disableRollingLinks() {
  836. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  837. for( var i = 0, len = anchors.length; i < len; i++ ) {
  838. var anchor = anchors[i];
  839. var span = anchor.querySelector( 'span' );
  840. if( span ) {
  841. anchor.classList.remove( 'roll' );
  842. anchor.innerHTML = span.innerHTML;
  843. }
  844. }
  845. }
  846. /**
  847. * Bind preview frame links.
  848. */
  849. function enablePreviewLinks( selector ) {
  850. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  851. anchors.forEach( function( element ) {
  852. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  853. element.addEventListener( 'click', onPreviewLinkClicked, false );
  854. }
  855. } );
  856. }
  857. /**
  858. * Unbind preview frame links.
  859. */
  860. function disablePreviewLinks() {
  861. var anchors = toArray( document.querySelectorAll( 'a' ) );
  862. anchors.forEach( function( element ) {
  863. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  864. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  865. }
  866. } );
  867. }
  868. /**
  869. * Opens a preview window for the target URL.
  870. */
  871. function openPreview( url ) {
  872. closePreview();
  873. dom.preview = document.createElement( 'div' );
  874. dom.preview.classList.add( 'preview-link-overlay' );
  875. dom.wrapper.appendChild( dom.preview );
  876. dom.preview.innerHTML = [
  877. '<header>',
  878. '<a class="close" href="#"><span class="icon"></span></a>',
  879. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  880. '</header>',
  881. '<div class="spinner"></div>',
  882. '<div class="viewport">',
  883. '<iframe src="'+ url +'"></iframe>',
  884. '</div>'
  885. ].join('');
  886. dom.preview.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  887. dom.preview.classList.add( 'loaded' );
  888. }, false );
  889. dom.preview.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  890. closePreview();
  891. event.preventDefault();
  892. }, false );
  893. dom.preview.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  894. closePreview();
  895. }, false );
  896. setTimeout( function() {
  897. dom.preview.classList.add( 'visible' );
  898. }, 1 );
  899. }
  900. /**
  901. * Closes the iframe preview window.
  902. */
  903. function closePreview() {
  904. if( dom.preview ) {
  905. dom.preview.setAttribute( 'src', '' );
  906. dom.preview.parentNode.removeChild( dom.preview );
  907. dom.preview = null;
  908. }
  909. }
  910. /**
  911. * Applies JavaScript-controlled layout rules to the
  912. * presentation.
  913. */
  914. function layout() {
  915. if( dom.wrapper && !isPrintingPDF() ) {
  916. var size = getComputedSlideSize();
  917. var slidePadding = 20; // TODO Dig this out of DOM
  918. // Layout the contents of the slides
  919. layoutSlideContents( config.width, config.height, slidePadding );
  920. dom.slides.style.width = size.width + 'px';
  921. dom.slides.style.height = size.height + 'px';
  922. // Determine scale of content to fit within available space
  923. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  924. // Respect max/min scale settings
  925. scale = Math.max( scale, config.minScale );
  926. scale = Math.min( scale, config.maxScale );
  927. // Prefer zooming in WebKit so that content remains crisp
  928. if( /webkit/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) {
  929. dom.slides.style.zoom = scale;
  930. }
  931. // Apply scale transform as a fallback
  932. else {
  933. dom.slides.style.left = '50%';
  934. dom.slides.style.top = '50%';
  935. dom.slides.style.bottom = 'auto';
  936. dom.slides.style.right = 'auto';
  937. transformElement( dom.slides, 'translate(-50%, -50%) scale('+ scale +')' );
  938. }
  939. // Select all slides, vertical and horizontal
  940. var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
  941. for( var i = 0, len = slides.length; i < len; i++ ) {
  942. var slide = slides[ i ];
  943. // Don't bother updating invisible slides
  944. if( slide.style.display === 'none' ) {
  945. continue;
  946. }
  947. if( config.center || slide.classList.contains( 'center' ) ) {
  948. // Vertical stacks are not centred since their section
  949. // children will be
  950. if( slide.classList.contains( 'stack' ) ) {
  951. slide.style.top = 0;
  952. }
  953. else {
  954. slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
  955. }
  956. }
  957. else {
  958. slide.style.top = '';
  959. }
  960. }
  961. updateProgress();
  962. updateParallax();
  963. }
  964. }
  965. /**
  966. * Applies layout logic to the contents of all slides in
  967. * the presentation.
  968. */
  969. function layoutSlideContents( width, height, padding ) {
  970. // Handle sizing of elements with the 'stretch' class
  971. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  972. // Determine how much vertical space we can use
  973. var remainingHeight = getRemainingHeight( element, height );
  974. // Consider the aspect ratio of media elements
  975. if( /(img|video)/gi.test( element.nodeName ) ) {
  976. var nw = element.naturalWidth || element.videoWidth,
  977. nh = element.naturalHeight || element.videoHeight;
  978. var es = Math.min( width / nw, remainingHeight / nh );
  979. element.style.width = ( nw * es ) + 'px';
  980. element.style.height = ( nh * es ) + 'px';
  981. }
  982. else {
  983. element.style.width = width + 'px';
  984. element.style.height = remainingHeight + 'px';
  985. }
  986. } );
  987. }
  988. /**
  989. * Calculates the computed pixel size of our slides. These
  990. * values are based on the width and height configuration
  991. * options.
  992. */
  993. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  994. var size = {
  995. // Slide size
  996. width: config.width,
  997. height: config.height,
  998. // Presentation size
  999. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1000. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1001. };
  1002. // Reduce available space by margin
  1003. size.presentationWidth -= ( size.presentationHeight * config.margin );
  1004. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1005. // Slide width may be a percentage of available width
  1006. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1007. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1008. }
  1009. // Slide height may be a percentage of available height
  1010. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1011. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1012. }
  1013. return size;
  1014. }
  1015. /**
  1016. * Stores the vertical index of a stack so that the same
  1017. * vertical slide can be selected when navigating to and
  1018. * from the stack.
  1019. *
  1020. * @param {HTMLElement} stack The vertical stack element
  1021. * @param {int} v Index to memorize
  1022. */
  1023. function setPreviousVerticalIndex( stack, v ) {
  1024. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1025. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1026. }
  1027. }
  1028. /**
  1029. * Retrieves the vertical index which was stored using
  1030. * #setPreviousVerticalIndex() or 0 if no previous index
  1031. * exists.
  1032. *
  1033. * @param {HTMLElement} stack The vertical stack element
  1034. */
  1035. function getPreviousVerticalIndex( stack ) {
  1036. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1037. // Prefer manually defined start-indexv
  1038. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1039. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1040. }
  1041. return 0;
  1042. }
  1043. /**
  1044. * Displays the overview of slides (quick nav) by
  1045. * scaling down and arranging all slide elements.
  1046. *
  1047. * Experimental feature, might be dropped if perf
  1048. * can't be improved.
  1049. */
  1050. function activateOverview() {
  1051. // Only proceed if enabled in config
  1052. if( config.overview ) {
  1053. // Don't auto-slide while in overview mode
  1054. cancelAutoSlide();
  1055. var wasActive = dom.wrapper.classList.contains( 'overview' );
  1056. // Vary the depth of the overview based on screen size
  1057. var depth = window.innerWidth < 400 ? 1000 : 2500;
  1058. dom.wrapper.classList.add( 'overview' );
  1059. dom.wrapper.classList.remove( 'overview-deactivating' );
  1060. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1061. for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
  1062. var hslide = horizontalSlides[i],
  1063. hoffset = config.rtl ? -105 : 105;
  1064. hslide.setAttribute( 'data-index-h', i );
  1065. // Apply CSS transform
  1066. transformElement( hslide, 'translateZ(-'+ depth +'px) translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)' );
  1067. if( hslide.classList.contains( 'stack' ) ) {
  1068. var verticalSlides = hslide.querySelectorAll( 'section' );
  1069. for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
  1070. var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );
  1071. var vslide = verticalSlides[j];
  1072. vslide.setAttribute( 'data-index-h', i );
  1073. vslide.setAttribute( 'data-index-v', j );
  1074. // Apply CSS transform
  1075. transformElement( vslide, 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)' );
  1076. // Navigate to this slide on click
  1077. vslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1078. }
  1079. }
  1080. else {
  1081. // Navigate to this slide on click
  1082. hslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1083. }
  1084. }
  1085. updateSlidesVisibility();
  1086. layout();
  1087. if( !wasActive ) {
  1088. // Notify observers of the overview showing
  1089. dispatchEvent( 'overviewshown', {
  1090. 'indexh': indexh,
  1091. 'indexv': indexv,
  1092. 'currentSlide': currentSlide
  1093. } );
  1094. }
  1095. }
  1096. }
  1097. /**
  1098. * Exits the slide overview and enters the currently
  1099. * active slide.
  1100. */
  1101. function deactivateOverview() {
  1102. // Only proceed if enabled in config
  1103. if( config.overview ) {
  1104. dom.wrapper.classList.remove( 'overview' );
  1105. // Temporarily add a class so that transitions can do different things
  1106. // depending on whether they are exiting/entering overview, or just
  1107. // moving from slide to slide
  1108. dom.wrapper.classList.add( 'overview-deactivating' );
  1109. setTimeout( function () {
  1110. dom.wrapper.classList.remove( 'overview-deactivating' );
  1111. }, 1 );
  1112. // Select all slides
  1113. toArray( document.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1114. // Resets all transforms to use the external styles
  1115. transformElement( slide, '' );
  1116. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1117. } );
  1118. slide( indexh, indexv );
  1119. cueAutoSlide();
  1120. // Notify observers of the overview hiding
  1121. dispatchEvent( 'overviewhidden', {
  1122. 'indexh': indexh,
  1123. 'indexv': indexv,
  1124. 'currentSlide': currentSlide
  1125. } );
  1126. }
  1127. }
  1128. /**
  1129. * Toggles the slide overview mode on and off.
  1130. *
  1131. * @param {Boolean} override Optional flag which overrides the
  1132. * toggle logic and forcibly sets the desired state. True means
  1133. * overview is open, false means it's closed.
  1134. */
  1135. function toggleOverview( override ) {
  1136. if( typeof override === 'boolean' ) {
  1137. override ? activateOverview() : deactivateOverview();
  1138. }
  1139. else {
  1140. isOverview() ? deactivateOverview() : activateOverview();
  1141. }
  1142. }
  1143. /**
  1144. * Checks if the overview is currently active.
  1145. *
  1146. * @return {Boolean} true if the overview is active,
  1147. * false otherwise
  1148. */
  1149. function isOverview() {
  1150. return dom.wrapper.classList.contains( 'overview' );
  1151. }
  1152. /**
  1153. * Checks if the current or specified slide is vertical
  1154. * (nested within another slide).
  1155. *
  1156. * @param {HTMLElement} slide [optional] The slide to check
  1157. * orientation of
  1158. */
  1159. function isVerticalSlide( slide ) {
  1160. // Prefer slide argument, otherwise use current slide
  1161. slide = slide ? slide : currentSlide;
  1162. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1163. }
  1164. /**
  1165. * Handling the fullscreen functionality via the fullscreen API
  1166. *
  1167. * @see http://fullscreen.spec.whatwg.org/
  1168. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1169. */
  1170. function enterFullscreen() {
  1171. var element = document.body;
  1172. // Check which implementation is available
  1173. var requestMethod = element.requestFullScreen ||
  1174. element.webkitRequestFullscreen ||
  1175. element.webkitRequestFullScreen ||
  1176. element.mozRequestFullScreen ||
  1177. element.msRequestFullscreen;
  1178. if( requestMethod ) {
  1179. requestMethod.apply( element );
  1180. }
  1181. }
  1182. /**
  1183. * Enters the paused mode which fades everything on screen to
  1184. * black.
  1185. */
  1186. function pause() {
  1187. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1188. cancelAutoSlide();
  1189. dom.wrapper.classList.add( 'paused' );
  1190. if( wasPaused === false ) {
  1191. dispatchEvent( 'paused' );
  1192. }
  1193. }
  1194. /**
  1195. * Exits from the paused mode.
  1196. */
  1197. function resume() {
  1198. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1199. dom.wrapper.classList.remove( 'paused' );
  1200. cueAutoSlide();
  1201. if( wasPaused ) {
  1202. dispatchEvent( 'resumed' );
  1203. }
  1204. }
  1205. /**
  1206. * Toggles the paused mode on and off.
  1207. */
  1208. function togglePause( override ) {
  1209. if( typeof override === 'boolean' ) {
  1210. override ? pause() : resume();
  1211. }
  1212. else {
  1213. isPaused() ? resume() : pause();
  1214. }
  1215. }
  1216. /**
  1217. * Checks if we are currently in the paused mode.
  1218. */
  1219. function isPaused() {
  1220. return dom.wrapper.classList.contains( 'paused' );
  1221. }
  1222. /**
  1223. * Toggles the auto slide mode on and off.
  1224. *
  1225. * @param {Boolean} override Optional flag which sets the desired state.
  1226. * True means autoplay starts, false means it stops.
  1227. */
  1228. function toggleAutoSlide( override ) {
  1229. if( typeof override === 'boolean' ) {
  1230. override ? resumeAutoSlide() : pauseAutoSlide();
  1231. }
  1232. else {
  1233. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  1234. }
  1235. }
  1236. /**
  1237. * Checks if the auto slide mode is currently on.
  1238. */
  1239. function isAutoSliding() {
  1240. return !!( autoSlide && !autoSlidePaused );
  1241. }
  1242. /**
  1243. * Steps from the current point in the presentation to the
  1244. * slide which matches the specified horizontal and vertical
  1245. * indices.
  1246. *
  1247. * @param {int} h Horizontal index of the target slide
  1248. * @param {int} v Vertical index of the target slide
  1249. * @param {int} f Optional index of a fragment within the
  1250. * target slide to activate
  1251. * @param {int} o Optional origin for use in multimaster environments
  1252. */
  1253. function slide( h, v, f, o ) {
  1254. // Remember where we were at before
  1255. previousSlide = currentSlide;
  1256. // Query all horizontal slides in the deck
  1257. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1258. // If no vertical index is specified and the upcoming slide is a
  1259. // stack, resume at its previous vertical index
  1260. if( v === undefined ) {
  1261. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1262. }
  1263. // If we were on a vertical stack, remember what vertical index
  1264. // it was on so we can resume at the same position when returning
  1265. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1266. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1267. }
  1268. // Remember the state before this slide
  1269. var stateBefore = state.concat();
  1270. // Reset the state array
  1271. state.length = 0;
  1272. var indexhBefore = indexh || 0,
  1273. indexvBefore = indexv || 0;
  1274. // Activate and transition to the new slide
  1275. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1276. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1277. // Update the visibility of slides now that the indices have changed
  1278. updateSlidesVisibility();
  1279. layout();
  1280. // Apply the new state
  1281. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1282. // Check if this state existed on the previous slide. If it
  1283. // did, we will avoid adding it repeatedly
  1284. for( var j = 0; j < stateBefore.length; j++ ) {
  1285. if( stateBefore[j] === state[i] ) {
  1286. stateBefore.splice( j, 1 );
  1287. continue stateLoop;
  1288. }
  1289. }
  1290. document.documentElement.classList.add( state[i] );
  1291. // Dispatch custom event matching the state's name
  1292. dispatchEvent( state[i] );
  1293. }
  1294. // Clean up the remains of the previous state
  1295. while( stateBefore.length ) {
  1296. document.documentElement.classList.remove( stateBefore.pop() );
  1297. }
  1298. // If the overview is active, re-activate it to update positions
  1299. if( isOverview() ) {
  1300. activateOverview();
  1301. }
  1302. // Find the current horizontal slide and any possible vertical slides
  1303. // within it
  1304. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1305. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1306. // Store references to the previous and current slides
  1307. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1308. // Show fragment, if specified
  1309. if( typeof f !== 'undefined' ) {
  1310. navigateFragment( f );
  1311. }
  1312. // Dispatch an event if the slide changed
  1313. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1314. if( slideChanged ) {
  1315. dispatchEvent( 'slidechanged', {
  1316. 'indexh': indexh,
  1317. 'indexv': indexv,
  1318. 'previousSlide': previousSlide,
  1319. 'currentSlide': currentSlide,
  1320. 'origin': o
  1321. } );
  1322. }
  1323. else {
  1324. // Ensure that the previous slide is never the same as the current
  1325. previousSlide = null;
  1326. }
  1327. // Solves an edge case where the previous slide maintains the
  1328. // 'present' class when navigating between adjacent vertical
  1329. // stacks
  1330. if( previousSlide ) {
  1331. previousSlide.classList.remove( 'present' );
  1332. // Reset all slides upon navigate to home
  1333. // Issue: #285
  1334. if ( document.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1335. // Launch async task
  1336. setTimeout( function () {
  1337. var slides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1338. for( i in slides ) {
  1339. if( slides[i] ) {
  1340. // Reset stack
  1341. setPreviousVerticalIndex( slides[i], 0 );
  1342. }
  1343. }
  1344. }, 0 );
  1345. }
  1346. }
  1347. // Handle embedded content
  1348. if( slideChanged ) {
  1349. stopEmbeddedContent( previousSlide );
  1350. startEmbeddedContent( currentSlide );
  1351. }
  1352. updateControls();
  1353. updateProgress();
  1354. updateBackground();
  1355. updateParallax();
  1356. updateSlideNumber();
  1357. // Update the URL hash
  1358. writeURL();
  1359. cueAutoSlide();
  1360. }
  1361. /**
  1362. * Syncs the presentation with the current DOM. Useful
  1363. * when new slides or control elements are added or when
  1364. * the configuration has changed.
  1365. */
  1366. function sync() {
  1367. // Subscribe to input
  1368. removeEventListeners();
  1369. addEventListeners();
  1370. // Force a layout to make sure the current config is accounted for
  1371. layout();
  1372. // Reflect the current autoSlide value
  1373. autoSlide = config.autoSlide;
  1374. // Start auto-sliding if it's enabled
  1375. cueAutoSlide();
  1376. // Re-create the slide backgrounds
  1377. createBackgrounds();
  1378. sortAllFragments();
  1379. updateControls();
  1380. updateProgress();
  1381. updateBackground( true );
  1382. updateSlideNumber();
  1383. }
  1384. /**
  1385. * Resets all vertical slides so that only the first
  1386. * is visible.
  1387. */
  1388. function resetVerticalSlides() {
  1389. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1390. horizontalSlides.forEach( function( horizontalSlide ) {
  1391. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1392. verticalSlides.forEach( function( verticalSlide, y ) {
  1393. if( y > 0 ) {
  1394. verticalSlide.classList.remove( 'present' );
  1395. verticalSlide.classList.remove( 'past' );
  1396. verticalSlide.classList.add( 'future' );
  1397. }
  1398. } );
  1399. } );
  1400. }
  1401. /**
  1402. * Sorts and formats all of fragments in the
  1403. * presentation.
  1404. */
  1405. function sortAllFragments() {
  1406. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1407. horizontalSlides.forEach( function( horizontalSlide ) {
  1408. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1409. verticalSlides.forEach( function( verticalSlide, y ) {
  1410. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  1411. } );
  1412. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  1413. } );
  1414. }
  1415. /**
  1416. * Updates one dimension of slides by showing the slide
  1417. * with the specified index.
  1418. *
  1419. * @param {String} selector A CSS selector that will fetch
  1420. * the group of slides we are working with
  1421. * @param {Number} index The index of the slide that should be
  1422. * shown
  1423. *
  1424. * @return {Number} The index of the slide that is now shown,
  1425. * might differ from the passed in index if it was out of
  1426. * bounds.
  1427. */
  1428. function updateSlides( selector, index ) {
  1429. // Select all slides and convert the NodeList result to
  1430. // an array
  1431. var slides = toArray( document.querySelectorAll( selector ) ),
  1432. slidesLength = slides.length;
  1433. var printMode = isPrintingPDF();
  1434. if( slidesLength ) {
  1435. // Should the index loop?
  1436. if( config.loop ) {
  1437. index %= slidesLength;
  1438. if( index < 0 ) {
  1439. index = slidesLength + index;
  1440. }
  1441. }
  1442. // Enforce max and minimum index bounds
  1443. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1444. for( var i = 0; i < slidesLength; i++ ) {
  1445. var element = slides[i];
  1446. var reverse = config.rtl && !isVerticalSlide( element );
  1447. element.classList.remove( 'past' );
  1448. element.classList.remove( 'present' );
  1449. element.classList.remove( 'future' );
  1450. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1451. element.setAttribute( 'hidden', '' );
  1452. // If this element contains vertical slides
  1453. if( element.querySelector( 'section' ) ) {
  1454. element.classList.add( 'stack' );
  1455. }
  1456. // If we're printing static slides, all slides are "present"
  1457. if( printMode ) {
  1458. element.classList.add( 'present' );
  1459. continue;
  1460. }
  1461. if( i < index ) {
  1462. // Any element previous to index is given the 'past' class
  1463. element.classList.add( reverse ? 'future' : 'past' );
  1464. if( config.fragments ) {
  1465. var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
  1466. // Show all fragments on prior slides
  1467. while( pastFragments.length ) {
  1468. var pastFragment = pastFragments.pop();
  1469. pastFragment.classList.add( 'visible' );
  1470. pastFragment.classList.remove( 'current-fragment' );
  1471. }
  1472. }
  1473. }
  1474. else if( i > index ) {
  1475. // Any element subsequent to index is given the 'future' class
  1476. element.classList.add( reverse ? 'past' : 'future' );
  1477. if( config.fragments ) {
  1478. var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1479. // No fragments in future slides should be visible ahead of time
  1480. while( futureFragments.length ) {
  1481. var futureFragment = futureFragments.pop();
  1482. futureFragment.classList.remove( 'visible' );
  1483. futureFragment.classList.remove( 'current-fragment' );
  1484. }
  1485. }
  1486. }
  1487. }
  1488. // Mark the current slide as present
  1489. slides[index].classList.add( 'present' );
  1490. slides[index].removeAttribute( 'hidden' );
  1491. // If this slide has a state associated with it, add it
  1492. // onto the current state of the deck
  1493. var slideState = slides[index].getAttribute( 'data-state' );
  1494. if( slideState ) {
  1495. state = state.concat( slideState.split( ' ' ) );
  1496. }
  1497. }
  1498. else {
  1499. // Since there are no slides we can't be anywhere beyond the
  1500. // zeroth index
  1501. index = 0;
  1502. }
  1503. return index;
  1504. }
  1505. /**
  1506. * Optimization method; hide all slides that are far away
  1507. * from the present slide.
  1508. */
  1509. function updateSlidesVisibility() {
  1510. // Select all slides and convert the NodeList result to
  1511. // an array
  1512. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1513. horizontalSlidesLength = horizontalSlides.length,
  1514. distanceX,
  1515. distanceY;
  1516. if( horizontalSlidesLength ) {
  1517. // The number of steps away from the present slide that will
  1518. // be visible
  1519. var viewDistance = isOverview() ? 10 : config.viewDistance;
  1520. // Limit view distance on weaker devices
  1521. if( isMobileDevice ) {
  1522. viewDistance = isOverview() ? 6 : 1;
  1523. }
  1524. // Limit view distance on weaker devices
  1525. if( isPrintingPDF() ) {
  1526. viewDistance = Number.MAX_VALUE;
  1527. }
  1528. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1529. var horizontalSlide = horizontalSlides[x];
  1530. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1531. verticalSlidesLength = verticalSlides.length;
  1532. // Loops so that it measures 1 between the first and last slides
  1533. distanceX = Math.abs( ( indexh - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1534. // Show the horizontal slide if it's within the view distance
  1535. if( distanceX < viewDistance ) {
  1536. horizontalSlide.style.display = 'block';
  1537. loadSlide( horizontalSlide );
  1538. }
  1539. else {
  1540. horizontalSlide.style.display = 'none';
  1541. }
  1542. if( verticalSlidesLength ) {
  1543. var oy = getPreviousVerticalIndex( horizontalSlide );
  1544. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1545. var verticalSlide = verticalSlides[y];
  1546. distanceY = x === indexh ? Math.abs( indexv - y ) : Math.abs( y - oy );
  1547. if( distanceX + distanceY < viewDistance ) {
  1548. verticalSlide.style.display = 'block';
  1549. loadSlide( verticalSlide );
  1550. }
  1551. else {
  1552. verticalSlide.style.display = 'none';
  1553. }
  1554. }
  1555. }
  1556. }
  1557. }
  1558. }
  1559. /**
  1560. * Updates the progress bar to reflect the current slide.
  1561. */
  1562. function updateProgress() {
  1563. // Update progress if enabled
  1564. if( config.progress && dom.progress ) {
  1565. dom.progressbar.style.width = getProgress() * window.innerWidth + 'px';
  1566. }
  1567. }
  1568. /**
  1569. * Updates the slide number div to reflect the current slide.
  1570. */
  1571. function updateSlideNumber() {
  1572. // Update slide number if enabled
  1573. if( config.slideNumber && dom.slideNumber) {
  1574. // Display the number of the page using 'indexh - indexv' format
  1575. var indexString = indexh;
  1576. if( indexv > 0 ) {
  1577. indexString += ' - ' + indexv;
  1578. }
  1579. dom.slideNumber.innerHTML = indexString;
  1580. }
  1581. }
  1582. /**
  1583. * Updates the state of all control/navigation arrows.
  1584. */
  1585. function updateControls() {
  1586. var routes = availableRoutes();
  1587. var fragments = availableFragments();
  1588. // Remove the 'enabled' class from all directions
  1589. dom.controlsLeft.concat( dom.controlsRight )
  1590. .concat( dom.controlsUp )
  1591. .concat( dom.controlsDown )
  1592. .concat( dom.controlsPrev )
  1593. .concat( dom.controlsNext ).forEach( function( node ) {
  1594. node.classList.remove( 'enabled' );
  1595. node.classList.remove( 'fragmented' );
  1596. } );
  1597. // Add the 'enabled' class to the available routes
  1598. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1599. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1600. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1601. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1602. // Prev/next buttons
  1603. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1604. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1605. // Highlight fragment directions
  1606. if( currentSlide ) {
  1607. // Always apply fragment decorator to prev/next buttons
  1608. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1609. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1610. // Apply fragment decorators to directional buttons based on
  1611. // what slide axis they are in
  1612. if( isVerticalSlide( currentSlide ) ) {
  1613. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1614. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1615. }
  1616. else {
  1617. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1618. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1619. }
  1620. }
  1621. }
  1622. /**
  1623. * Updates the background elements to reflect the current
  1624. * slide.
  1625. *
  1626. * @param {Boolean} includeAll If true, the backgrounds of
  1627. * all vertical slides (not just the present) will be updated.
  1628. */
  1629. function updateBackground( includeAll ) {
  1630. var currentBackground = null;
  1631. // Reverse past/future classes when in RTL mode
  1632. var horizontalPast = config.rtl ? 'future' : 'past',
  1633. horizontalFuture = config.rtl ? 'past' : 'future';
  1634. // Update the classes of all backgrounds to match the
  1635. // states of their slides (past/present/future)
  1636. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  1637. backgroundh.classList.remove( 'past' );
  1638. backgroundh.classList.remove( 'present' );
  1639. backgroundh.classList.remove( 'future' );
  1640. if( h < indexh ) {
  1641. backgroundh.classList.add( horizontalPast );
  1642. }
  1643. else if ( h > indexh ) {
  1644. backgroundh.classList.add( horizontalFuture );
  1645. }
  1646. else {
  1647. backgroundh.classList.add( 'present' );
  1648. // Store a reference to the current background element
  1649. currentBackground = backgroundh;
  1650. }
  1651. if( includeAll || h === indexh ) {
  1652. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  1653. backgroundv.classList.remove( 'past' );
  1654. backgroundv.classList.remove( 'present' );
  1655. backgroundv.classList.remove( 'future' );
  1656. if( v < indexv ) {
  1657. backgroundv.classList.add( 'past' );
  1658. }
  1659. else if ( v > indexv ) {
  1660. backgroundv.classList.add( 'future' );
  1661. }
  1662. else {
  1663. backgroundv.classList.add( 'present' );
  1664. // Only if this is the present horizontal and vertical slide
  1665. if( h === indexh ) currentBackground = backgroundv;
  1666. }
  1667. } );
  1668. }
  1669. } );
  1670. // Stop any currently playing video background
  1671. if( previousBackground ) {
  1672. var previousVideo = previousBackground.querySelector( 'video' );
  1673. if( previousVideo ) previousVideo.pause();
  1674. }
  1675. if( currentBackground ) {
  1676. // Start video playback
  1677. var currentVideo = currentBackground.querySelector( 'video' );
  1678. if( currentVideo ) currentVideo.play();
  1679. // Don't transition between identical backgrounds. This
  1680. // prevents unwanted flicker.
  1681. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  1682. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  1683. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  1684. dom.background.classList.add( 'no-transition' );
  1685. }
  1686. previousBackground = currentBackground;
  1687. }
  1688. // Allow the first background to apply without transition
  1689. setTimeout( function() {
  1690. dom.background.classList.remove( 'no-transition' );
  1691. }, 1 );
  1692. }
  1693. /**
  1694. * Updates the position of the parallax background based
  1695. * on the current slide index.
  1696. */
  1697. function updateParallax() {
  1698. if( config.parallaxBackgroundImage ) {
  1699. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1700. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1701. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  1702. backgroundWidth, backgroundHeight;
  1703. if( backgroundSize.length === 1 ) {
  1704. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  1705. }
  1706. else {
  1707. backgroundWidth = parseInt( backgroundSize[0], 10 );
  1708. backgroundHeight = parseInt( backgroundSize[1], 10 );
  1709. }
  1710. var slideWidth = dom.background.offsetWidth;
  1711. var horizontalSlideCount = horizontalSlides.length;
  1712. var horizontalOffset = -( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) * indexh;
  1713. var slideHeight = dom.background.offsetHeight;
  1714. var verticalSlideCount = verticalSlides.length;
  1715. var verticalOffset = verticalSlideCount > 1 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0;
  1716. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
  1717. }
  1718. }
  1719. /**
  1720. * Loads any content that is set to load lazily (data-src)
  1721. * inside of the given slide.
  1722. */
  1723. function loadSlide( slide ) {
  1724. // Media elements with data-src attributes
  1725. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  1726. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  1727. element.removeAttribute( 'data-src' );
  1728. } );
  1729. // Media elements with multiple <source>s
  1730. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  1731. var sources = 0;
  1732. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  1733. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  1734. source.removeAttribute( 'data-src' );
  1735. sources += 1;
  1736. } );
  1737. // If we rewrote sources for this video/audio element, we need
  1738. // to manually tell it to load from its new origin
  1739. if( sources > 0 ) {
  1740. media.load();
  1741. }
  1742. } );
  1743. }
  1744. /**
  1745. * Determine what available routes there are for navigation.
  1746. *
  1747. * @return {Object} containing four booleans: left/right/up/down
  1748. */
  1749. function availableRoutes() {
  1750. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1751. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1752. var routes = {
  1753. left: indexh > 0 || config.loop,
  1754. right: indexh < horizontalSlides.length - 1 || config.loop,
  1755. up: indexv > 0,
  1756. down: indexv < verticalSlides.length - 1
  1757. };
  1758. // reverse horizontal controls for rtl
  1759. if( config.rtl ) {
  1760. var left = routes.left;
  1761. routes.left = routes.right;
  1762. routes.right = left;
  1763. }
  1764. return routes;
  1765. }
  1766. /**
  1767. * Returns an object describing the available fragment
  1768. * directions.
  1769. *
  1770. * @return {Object} two boolean properties: prev/next
  1771. */
  1772. function availableFragments() {
  1773. if( currentSlide && config.fragments ) {
  1774. var fragments = currentSlide.querySelectorAll( '.fragment' );
  1775. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  1776. return {
  1777. prev: fragments.length - hiddenFragments.length > 0,
  1778. next: !!hiddenFragments.length
  1779. };
  1780. }
  1781. else {
  1782. return { prev: false, next: false };
  1783. }
  1784. }
  1785. /**
  1786. * Start playback of any embedded content inside of
  1787. * the targeted slide.
  1788. */
  1789. function startEmbeddedContent( slide ) {
  1790. if( slide && !isSpeakerNotes() ) {
  1791. // HTML5 media elements
  1792. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1793. if( el.hasAttribute( 'data-autoplay' ) ) {
  1794. el.play();
  1795. }
  1796. } );
  1797. // iframe embeds
  1798. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  1799. el.contentWindow.postMessage( 'slide:start', '*' );
  1800. });
  1801. // YouTube embeds
  1802. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1803. if( el.hasAttribute( 'data-autoplay' ) ) {
  1804. el.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  1805. }
  1806. });
  1807. }
  1808. }
  1809. /**
  1810. * Stop playback of any embedded content inside of
  1811. * the targeted slide.
  1812. */
  1813. function stopEmbeddedContent( slide ) {
  1814. if( slide ) {
  1815. // HTML5 media elements
  1816. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1817. if( !el.hasAttribute( 'data-ignore' ) ) {
  1818. el.pause();
  1819. }
  1820. } );
  1821. // iframe embeds
  1822. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  1823. el.contentWindow.postMessage( 'slide:stop', '*' );
  1824. });
  1825. // YouTube embeds
  1826. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1827. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  1828. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  1829. }
  1830. });
  1831. }
  1832. }
  1833. /**
  1834. * Returns a value ranging from 0-1 that represents
  1835. * how far into the presentation we have navigated.
  1836. */
  1837. function getProgress() {
  1838. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1839. // The number of past and total slides
  1840. var totalCount = document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  1841. var pastCount = 0;
  1842. // Step through all slides and count the past ones
  1843. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  1844. var horizontalSlide = horizontalSlides[i];
  1845. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1846. for( var j = 0; j < verticalSlides.length; j++ ) {
  1847. // Stop as soon as we arrive at the present
  1848. if( verticalSlides[j].classList.contains( 'present' ) ) {
  1849. break mainLoop;
  1850. }
  1851. pastCount++;
  1852. }
  1853. // Stop as soon as we arrive at the present
  1854. if( horizontalSlide.classList.contains( 'present' ) ) {
  1855. break;
  1856. }
  1857. // Don't count the wrapping section for vertical slides
  1858. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  1859. pastCount++;
  1860. }
  1861. }
  1862. if( currentSlide ) {
  1863. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  1864. // If there are fragments in the current slide those should be
  1865. // accounted for in the progress.
  1866. if( allFragments.length > 0 ) {
  1867. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  1868. // This value represents how big a portion of the slide progress
  1869. // that is made up by its fragments (0-1)
  1870. var fragmentWeight = 0.9;
  1871. // Add fragment progress to the past slide count
  1872. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  1873. }
  1874. }
  1875. return pastCount / ( totalCount - 1 );
  1876. }
  1877. /**
  1878. * Checks if this presentation is running inside of the
  1879. * speaker notes window.
  1880. */
  1881. function isSpeakerNotes() {
  1882. return !!window.location.search.match( /receiver/gi );
  1883. }
  1884. /**
  1885. * Reads the current URL (hash) and navigates accordingly.
  1886. */
  1887. function readURL() {
  1888. var hash = window.location.hash;
  1889. // Attempt to parse the hash as either an index or name
  1890. var bits = hash.slice( 2 ).split( '/' ),
  1891. name = hash.replace( /#|\//gi, '' );
  1892. // If the first bit is invalid and there is a name we can
  1893. // assume that this is a named link
  1894. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  1895. var element;
  1896. try {
  1897. // Find the slide with the specified name
  1898. element = document.querySelector( '#' + name );
  1899. }
  1900. catch( e ) {
  1901. // If the ID is an invalid selector a harmless SyntaxError
  1902. // may be thrown here.
  1903. }
  1904. if( element ) {
  1905. // Find the position of the named slide and navigate to it
  1906. var indices = Reveal.getIndices( element );
  1907. slide( indices.h, indices.v );
  1908. }
  1909. // If the slide doesn't exist, navigate to the current slide
  1910. else {
  1911. slide( indexh || 0, indexv || 0 );
  1912. }
  1913. }
  1914. else {
  1915. // Read the index components of the hash
  1916. var h = parseInt( bits[0], 10 ) || 0,
  1917. v = parseInt( bits[1], 10 ) || 0;
  1918. if( h !== indexh || v !== indexv ) {
  1919. slide( h, v );
  1920. }
  1921. }
  1922. }
  1923. /**
  1924. * Updates the page URL (hash) to reflect the current
  1925. * state.
  1926. *
  1927. * @param {Number} delay The time in ms to wait before
  1928. * writing the hash
  1929. */
  1930. function writeURL( delay ) {
  1931. if( config.history ) {
  1932. // Make sure there's never more than one timeout running
  1933. clearTimeout( writeURLTimeout );
  1934. // If a delay is specified, timeout this call
  1935. if( typeof delay === 'number' ) {
  1936. writeURLTimeout = setTimeout( writeURL, delay );
  1937. }
  1938. else {
  1939. var url = '/';
  1940. // Attempt to create a named link based on the slide's ID
  1941. var id = currentSlide.getAttribute( 'id' );
  1942. if( id ) {
  1943. id = id.toLowerCase();
  1944. id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
  1945. }
  1946. // If the current slide has an ID, use that as a named link
  1947. if( currentSlide && typeof id === 'string' && id.length ) {
  1948. url = '/' + id;
  1949. }
  1950. // Otherwise use the /h/v index
  1951. else {
  1952. if( indexh > 0 || indexv > 0 ) url += indexh;
  1953. if( indexv > 0 ) url += '/' + indexv;
  1954. }
  1955. window.location.hash = url;
  1956. }
  1957. }
  1958. }
  1959. /**
  1960. * Retrieves the h/v location of the current, or specified,
  1961. * slide.
  1962. *
  1963. * @param {HTMLElement} slide If specified, the returned
  1964. * index will be for this slide rather than the currently
  1965. * active one
  1966. *
  1967. * @return {Object} { h: <int>, v: <int>, f: <int> }
  1968. */
  1969. function getIndices( slide ) {
  1970. // By default, return the current indices
  1971. var h = indexh,
  1972. v = indexv,
  1973. f;
  1974. // If a slide is specified, return the indices of that slide
  1975. if( slide ) {
  1976. var isVertical = isVerticalSlide( slide );
  1977. var slideh = isVertical ? slide.parentNode : slide;
  1978. // Select all horizontal slides
  1979. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1980. // Now that we know which the horizontal slide is, get its index
  1981. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  1982. // If this is a vertical slide, grab the vertical index
  1983. if( isVertical ) {
  1984. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  1985. }
  1986. }
  1987. if( !slide && currentSlide ) {
  1988. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  1989. if( hasFragments ) {
  1990. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  1991. f = visibleFragments.length - 1;
  1992. }
  1993. }
  1994. return { h: h, v: v, f: f };
  1995. }
  1996. /**
  1997. * Retrieves the total number of slides in this presentation.
  1998. */
  1999. function getTotalSlides() {
  2000. return document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  2001. }
  2002. /**
  2003. * Retrieves the current state of the presentation as
  2004. * an object. This state can then be restored at any
  2005. * time.
  2006. */
  2007. function getState() {
  2008. var indices = getIndices();
  2009. return {
  2010. indexh: indices.h,
  2011. indexv: indices.v,
  2012. indexf: indices.f,
  2013. paused: isPaused(),
  2014. overview: isOverview()
  2015. };
  2016. }
  2017. /**
  2018. * Restores the presentation to the given state.
  2019. *
  2020. * @param {Object} state As generated by getState()
  2021. */
  2022. function setState( state ) {
  2023. if( typeof state === 'object' ) {
  2024. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  2025. var pausedFlag = deserialize( state.paused ),
  2026. overviewFlag = deserialize( state.overview );
  2027. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  2028. togglePause( pausedFlag );
  2029. }
  2030. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  2031. toggleOverview( overviewFlag );
  2032. }
  2033. }
  2034. }
  2035. /**
  2036. * Return a sorted fragments list, ordered by an increasing
  2037. * "data-fragment-index" attribute.
  2038. *
  2039. * Fragments will be revealed in the order that they are returned by
  2040. * this function, so you can use the index attributes to control the
  2041. * order of fragment appearance.
  2042. *
  2043. * To maintain a sensible default fragment order, fragments are presumed
  2044. * to be passed in document order. This function adds a "fragment-index"
  2045. * attribute to each node if such an attribute is not already present,
  2046. * and sets that attribute to an integer value which is the position of
  2047. * the fragment within the fragments list.
  2048. */
  2049. function sortFragments( fragments ) {
  2050. fragments = toArray( fragments );
  2051. var ordered = [],
  2052. unordered = [],
  2053. sorted = [];
  2054. // Group ordered and unordered elements
  2055. fragments.forEach( function( fragment, i ) {
  2056. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  2057. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  2058. if( !ordered[index] ) {
  2059. ordered[index] = [];
  2060. }
  2061. ordered[index].push( fragment );
  2062. }
  2063. else {
  2064. unordered.push( [ fragment ] );
  2065. }
  2066. } );
  2067. // Append fragments without explicit indices in their
  2068. // DOM order
  2069. ordered = ordered.concat( unordered );
  2070. // Manually count the index up per group to ensure there
  2071. // are no gaps
  2072. var index = 0;
  2073. // Push all fragments in their sorted order to an array,
  2074. // this flattens the groups
  2075. ordered.forEach( function( group ) {
  2076. group.forEach( function( fragment ) {
  2077. sorted.push( fragment );
  2078. fragment.setAttribute( 'data-fragment-index', index );
  2079. } );
  2080. index ++;
  2081. } );
  2082. return sorted;
  2083. }
  2084. /**
  2085. * Navigate to the specified slide fragment.
  2086. *
  2087. * @param {Number} index The index of the fragment that
  2088. * should be shown, -1 means all are invisible
  2089. * @param {Number} offset Integer offset to apply to the
  2090. * fragment index
  2091. *
  2092. * @return {Boolean} true if a change was made in any
  2093. * fragments visibility as part of this call
  2094. */
  2095. function navigateFragment( index, offset ) {
  2096. if( currentSlide && config.fragments ) {
  2097. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  2098. if( fragments.length ) {
  2099. // If no index is specified, find the current
  2100. if( typeof index !== 'number' ) {
  2101. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  2102. if( lastVisibleFragment ) {
  2103. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  2104. }
  2105. else {
  2106. index = -1;
  2107. }
  2108. }
  2109. // If an offset is specified, apply it to the index
  2110. if( typeof offset === 'number' ) {
  2111. index += offset;
  2112. }
  2113. var fragmentsShown = [],
  2114. fragmentsHidden = [];
  2115. toArray( fragments ).forEach( function( element, i ) {
  2116. if( element.hasAttribute( 'data-fragment-index' ) ) {
  2117. i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
  2118. }
  2119. // Visible fragments
  2120. if( i <= index ) {
  2121. if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
  2122. element.classList.add( 'visible' );
  2123. element.classList.remove( 'current-fragment' );
  2124. if( i === index ) {
  2125. element.classList.add( 'current-fragment' );
  2126. }
  2127. }
  2128. // Hidden fragments
  2129. else {
  2130. if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
  2131. element.classList.remove( 'visible' );
  2132. element.classList.remove( 'current-fragment' );
  2133. }
  2134. } );
  2135. if( fragmentsHidden.length ) {
  2136. dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
  2137. }
  2138. if( fragmentsShown.length ) {
  2139. dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
  2140. }
  2141. updateControls();
  2142. updateProgress();
  2143. return !!( fragmentsShown.length || fragmentsHidden.length );
  2144. }
  2145. }
  2146. return false;
  2147. }
  2148. /**
  2149. * Navigate to the next slide fragment.
  2150. *
  2151. * @return {Boolean} true if there was a next fragment,
  2152. * false otherwise
  2153. */
  2154. function nextFragment() {
  2155. return navigateFragment( null, 1 );
  2156. }
  2157. /**
  2158. * Navigate to the previous slide fragment.
  2159. *
  2160. * @return {Boolean} true if there was a previous fragment,
  2161. * false otherwise
  2162. */
  2163. function previousFragment() {
  2164. return navigateFragment( null, -1 );
  2165. }
  2166. /**
  2167. * Cues a new automated slide if enabled in the config.
  2168. */
  2169. function cueAutoSlide() {
  2170. cancelAutoSlide();
  2171. if( currentSlide ) {
  2172. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2173. var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null;
  2174. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  2175. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  2176. // Pick value in the following priority order:
  2177. // 1. Current fragment's data-autoslide
  2178. // 2. Current slide's data-autoslide
  2179. // 3. Parent slide's data-autoslide
  2180. // 4. Global autoSlide setting
  2181. if( fragmentAutoSlide ) {
  2182. autoSlide = parseInt( fragmentAutoSlide, 10 );
  2183. }
  2184. else if( slideAutoSlide ) {
  2185. autoSlide = parseInt( slideAutoSlide, 10 );
  2186. }
  2187. else if( parentAutoSlide ) {
  2188. autoSlide = parseInt( parentAutoSlide, 10 );
  2189. }
  2190. else {
  2191. autoSlide = config.autoSlide;
  2192. }
  2193. // If there are media elements with data-autoplay,
  2194. // automatically set the autoSlide duration to the
  2195. // length of that media
  2196. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2197. if( el.hasAttribute( 'data-autoplay' ) ) {
  2198. if( autoSlide && el.duration * 1000 > autoSlide ) {
  2199. autoSlide = ( el.duration * 1000 ) + 1000;
  2200. }
  2201. }
  2202. } );
  2203. // Cue the next auto-slide if:
  2204. // - There is an autoSlide value
  2205. // - Auto-sliding isn't paused by the user
  2206. // - The presentation isn't paused
  2207. // - The overview isn't active
  2208. // - The presentation isn't over
  2209. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || config.loop === true ) ) {
  2210. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  2211. autoSlideStartTime = Date.now();
  2212. }
  2213. if( autoSlidePlayer ) {
  2214. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  2215. }
  2216. }
  2217. }
  2218. /**
  2219. * Cancels any ongoing request to auto-slide.
  2220. */
  2221. function cancelAutoSlide() {
  2222. clearTimeout( autoSlideTimeout );
  2223. autoSlideTimeout = -1;
  2224. }
  2225. function pauseAutoSlide() {
  2226. if( autoSlide && !autoSlidePaused ) {
  2227. autoSlidePaused = true;
  2228. dispatchEvent( 'autoslidepaused' );
  2229. clearTimeout( autoSlideTimeout );
  2230. if( autoSlidePlayer ) {
  2231. autoSlidePlayer.setPlaying( false );
  2232. }
  2233. }
  2234. }
  2235. function resumeAutoSlide() {
  2236. if( autoSlide && autoSlidePaused ) {
  2237. autoSlidePaused = false;
  2238. dispatchEvent( 'autoslideresumed' );
  2239. cueAutoSlide();
  2240. }
  2241. }
  2242. function navigateLeft() {
  2243. // Reverse for RTL
  2244. if( config.rtl ) {
  2245. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  2246. slide( indexh + 1 );
  2247. }
  2248. }
  2249. // Normal navigation
  2250. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  2251. slide( indexh - 1 );
  2252. }
  2253. }
  2254. function navigateRight() {
  2255. // Reverse for RTL
  2256. if( config.rtl ) {
  2257. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  2258. slide( indexh - 1 );
  2259. }
  2260. }
  2261. // Normal navigation
  2262. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  2263. slide( indexh + 1 );
  2264. }
  2265. }
  2266. function navigateUp() {
  2267. // Prioritize hiding fragments
  2268. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  2269. slide( indexh, indexv - 1 );
  2270. }
  2271. }
  2272. function navigateDown() {
  2273. // Prioritize revealing fragments
  2274. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  2275. slide( indexh, indexv + 1 );
  2276. }
  2277. }
  2278. /**
  2279. * Navigates backwards, prioritized in the following order:
  2280. * 1) Previous fragment
  2281. * 2) Previous vertical slide
  2282. * 3) Previous horizontal slide
  2283. */
  2284. function navigatePrev() {
  2285. // Prioritize revealing fragments
  2286. if( previousFragment() === false ) {
  2287. if( availableRoutes().up ) {
  2288. navigateUp();
  2289. }
  2290. else {
  2291. // Fetch the previous horizontal slide, if there is one
  2292. var previousSlide = document.querySelector( HORIZONTAL_SLIDES_SELECTOR + '.past:nth-child(' + indexh + ')' );
  2293. if( previousSlide ) {
  2294. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  2295. var h = indexh - 1;
  2296. slide( h, v );
  2297. }
  2298. }
  2299. }
  2300. }
  2301. /**
  2302. * Same as #navigatePrev() but navigates forwards.
  2303. */
  2304. function navigateNext() {
  2305. // Prioritize revealing fragments
  2306. if( nextFragment() === false ) {
  2307. availableRoutes().down ? navigateDown() : navigateRight();
  2308. }
  2309. // If auto-sliding is enabled we need to cue up
  2310. // another timeout
  2311. cueAutoSlide();
  2312. }
  2313. // --------------------------------------------------------------------//
  2314. // ----------------------------- EVENTS -------------------------------//
  2315. // --------------------------------------------------------------------//
  2316. /**
  2317. * Called by all event handlers that are based on user
  2318. * input.
  2319. */
  2320. function onUserInput( event ) {
  2321. if( config.autoSlideStoppable ) {
  2322. pauseAutoSlide();
  2323. }
  2324. }
  2325. /**
  2326. * Handler for the document level 'keydown' event.
  2327. */
  2328. function onDocumentKeyDown( event ) {
  2329. // If there's a condition specified and it returns false,
  2330. // ignore this event
  2331. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
  2332. return true;
  2333. }
  2334. // Remember if auto-sliding was paused so we can toggle it
  2335. var autoSlideWasPaused = autoSlidePaused;
  2336. onUserInput( event );
  2337. // Check if there's a focused element that could be using
  2338. // the keyboard
  2339. var activeElement = document.activeElement;
  2340. var hasFocus = !!( document.activeElement && ( document.activeElement.type || document.activeElement.href || document.activeElement.contentEditable !== 'inherit' ) );
  2341. // Disregard the event if there's a focused element or a
  2342. // keyboard modifier key is present
  2343. if( hasFocus || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  2344. // While paused only allow "unpausing" keyboard events (b and .)
  2345. if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) {
  2346. return false;
  2347. }
  2348. var triggered = false;
  2349. // 1. User defined key bindings
  2350. if( typeof config.keyboard === 'object' ) {
  2351. for( var key in config.keyboard ) {
  2352. // Check if this binding matches the pressed key
  2353. if( parseInt( key, 10 ) === event.keyCode ) {
  2354. var value = config.keyboard[ key ];
  2355. // Callback function
  2356. if( typeof value === 'function' ) {
  2357. value.apply( null, [ event ] );
  2358. }
  2359. // String shortcuts to reveal.js API
  2360. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  2361. Reveal[ value ].call();
  2362. }
  2363. triggered = true;
  2364. }
  2365. }
  2366. }
  2367. // 2. System defined key bindings
  2368. if( triggered === false ) {
  2369. // Assume true and try to prove false
  2370. triggered = true;
  2371. switch( event.keyCode ) {
  2372. // p, page up
  2373. case 80: case 33: navigatePrev(); break;
  2374. // n, page down
  2375. case 78: case 34: navigateNext(); break;
  2376. // h, left
  2377. case 72: case 37: navigateLeft(); break;
  2378. // l, right
  2379. case 76: case 39: navigateRight(); break;
  2380. // k, up
  2381. case 75: case 38: navigateUp(); break;
  2382. // j, down
  2383. case 74: case 40: navigateDown(); break;
  2384. // home
  2385. case 36: slide( 0 ); break;
  2386. // end
  2387. case 35: slide( Number.MAX_VALUE ); break;
  2388. // space
  2389. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  2390. // return
  2391. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  2392. // two-spot, semicolon, b, period, Logitech presenter tools "black screen" button
  2393. case 58: case 59: case 66: case 190: case 191: togglePause(); break;
  2394. // f
  2395. case 70: enterFullscreen(); break;
  2396. // a
  2397. case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
  2398. default:
  2399. triggered = false;
  2400. }
  2401. }
  2402. // If the input resulted in a triggered action we should prevent
  2403. // the browsers default behavior
  2404. if( triggered ) {
  2405. event.preventDefault();
  2406. }
  2407. // ESC or O key
  2408. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  2409. if( dom.preview ) {
  2410. closePreview();
  2411. }
  2412. else {
  2413. toggleOverview();
  2414. }
  2415. event.preventDefault();
  2416. }
  2417. // If auto-sliding is enabled we need to cue up
  2418. // another timeout
  2419. cueAutoSlide();
  2420. }
  2421. /**
  2422. * Handler for the 'touchstart' event, enables support for
  2423. * swipe and pinch gestures.
  2424. */
  2425. function onTouchStart( event ) {
  2426. touch.startX = event.touches[0].clientX;
  2427. touch.startY = event.touches[0].clientY;
  2428. touch.startCount = event.touches.length;
  2429. // If there's two touches we need to memorize the distance
  2430. // between those two points to detect pinching
  2431. if( event.touches.length === 2 && config.overview ) {
  2432. touch.startSpan = distanceBetween( {
  2433. x: event.touches[1].clientX,
  2434. y: event.touches[1].clientY
  2435. }, {
  2436. x: touch.startX,
  2437. y: touch.startY
  2438. } );
  2439. }
  2440. }
  2441. /**
  2442. * Handler for the 'touchmove' event.
  2443. */
  2444. function onTouchMove( event ) {
  2445. // Each touch should only trigger one action
  2446. if( !touch.captured ) {
  2447. onUserInput( event );
  2448. var currentX = event.touches[0].clientX;
  2449. var currentY = event.touches[0].clientY;
  2450. // If the touch started with two points and still has
  2451. // two active touches; test for the pinch gesture
  2452. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  2453. // The current distance in pixels between the two touch points
  2454. var currentSpan = distanceBetween( {
  2455. x: event.touches[1].clientX,
  2456. y: event.touches[1].clientY
  2457. }, {
  2458. x: touch.startX,
  2459. y: touch.startY
  2460. } );
  2461. // If the span is larger than the desire amount we've got
  2462. // ourselves a pinch
  2463. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  2464. touch.captured = true;
  2465. if( currentSpan < touch.startSpan ) {
  2466. activateOverview();
  2467. }
  2468. else {
  2469. deactivateOverview();
  2470. }
  2471. }
  2472. event.preventDefault();
  2473. }
  2474. // There was only one touch point, look for a swipe
  2475. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  2476. var deltaX = currentX - touch.startX,
  2477. deltaY = currentY - touch.startY;
  2478. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2479. touch.captured = true;
  2480. navigateLeft();
  2481. }
  2482. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2483. touch.captured = true;
  2484. navigateRight();
  2485. }
  2486. else if( deltaY > touch.threshold ) {
  2487. touch.captured = true;
  2488. navigateUp();
  2489. }
  2490. else if( deltaY < -touch.threshold ) {
  2491. touch.captured = true;
  2492. navigateDown();
  2493. }
  2494. // If we're embedded, only block touch events if they have
  2495. // triggered an action
  2496. if( config.embedded ) {
  2497. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  2498. event.preventDefault();
  2499. }
  2500. }
  2501. // Not embedded? Block them all to avoid needless tossing
  2502. // around of the viewport in iOS
  2503. else {
  2504. event.preventDefault();
  2505. }
  2506. }
  2507. }
  2508. // There's a bug with swiping on some Android devices unless
  2509. // the default action is always prevented
  2510. else if( navigator.userAgent.match( /android/gi ) ) {
  2511. event.preventDefault();
  2512. }
  2513. }
  2514. /**
  2515. * Handler for the 'touchend' event.
  2516. */
  2517. function onTouchEnd( event ) {
  2518. touch.captured = false;
  2519. }
  2520. /**
  2521. * Convert pointer down to touch start.
  2522. */
  2523. function onPointerDown( event ) {
  2524. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2525. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2526. onTouchStart( event );
  2527. }
  2528. }
  2529. /**
  2530. * Convert pointer move to touch move.
  2531. */
  2532. function onPointerMove( event ) {
  2533. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2534. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2535. onTouchMove( event );
  2536. }
  2537. }
  2538. /**
  2539. * Convert pointer up to touch end.
  2540. */
  2541. function onPointerUp( event ) {
  2542. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2543. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2544. onTouchEnd( event );
  2545. }
  2546. }
  2547. /**
  2548. * Handles mouse wheel scrolling, throttled to avoid skipping
  2549. * multiple slides.
  2550. */
  2551. function onDocumentMouseScroll( event ) {
  2552. if( Date.now() - lastMouseWheelStep > 600 ) {
  2553. lastMouseWheelStep = Date.now();
  2554. var delta = event.detail || -event.wheelDelta;
  2555. if( delta > 0 ) {
  2556. navigateNext();
  2557. }
  2558. else {
  2559. navigatePrev();
  2560. }
  2561. }
  2562. }
  2563. /**
  2564. * Clicking on the progress bar results in a navigation to the
  2565. * closest approximate horizontal slide using this equation:
  2566. *
  2567. * ( clickX / presentationWidth ) * numberOfSlides
  2568. */
  2569. function onProgressClicked( event ) {
  2570. onUserInput( event );
  2571. event.preventDefault();
  2572. var slidesTotal = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  2573. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  2574. slide( slideIndex );
  2575. }
  2576. /**
  2577. * Event handler for navigation control buttons.
  2578. */
  2579. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  2580. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  2581. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  2582. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  2583. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  2584. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  2585. /**
  2586. * Handler for the window level 'hashchange' event.
  2587. */
  2588. function onWindowHashChange( event ) {
  2589. readURL();
  2590. }
  2591. /**
  2592. * Handler for the window level 'resize' event.
  2593. */
  2594. function onWindowResize( event ) {
  2595. layout();
  2596. }
  2597. /**
  2598. * Handle for the window level 'visibilitychange' event.
  2599. */
  2600. function onPageVisibilityChange( event ) {
  2601. var isHidden = document.webkitHidden ||
  2602. document.msHidden ||
  2603. document.hidden;
  2604. // If, after clicking a link or similar and we're coming back,
  2605. // focus the document.body to ensure we can use keyboard shortcuts
  2606. if( isHidden === false && document.activeElement !== document.body ) {
  2607. document.activeElement.blur();
  2608. document.body.focus();
  2609. }
  2610. }
  2611. /**
  2612. * Invoked when a slide is and we're in the overview.
  2613. */
  2614. function onOverviewSlideClicked( event ) {
  2615. // TODO There's a bug here where the event listeners are not
  2616. // removed after deactivating the overview.
  2617. if( eventsAreBound && isOverview() ) {
  2618. event.preventDefault();
  2619. var element = event.target;
  2620. while( element && !element.nodeName.match( /section/gi ) ) {
  2621. element = element.parentNode;
  2622. }
  2623. if( element && !element.classList.contains( 'disabled' ) ) {
  2624. deactivateOverview();
  2625. if( element.nodeName.match( /section/gi ) ) {
  2626. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  2627. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  2628. slide( h, v );
  2629. }
  2630. }
  2631. }
  2632. }
  2633. /**
  2634. * Handles clicks on links that are set to preview in the
  2635. * iframe overlay.
  2636. */
  2637. function onPreviewLinkClicked( event ) {
  2638. var url = event.target.getAttribute( 'href' );
  2639. if( url ) {
  2640. openPreview( url );
  2641. event.preventDefault();
  2642. }
  2643. }
  2644. /**
  2645. * Handles click on the auto-sliding controls element.
  2646. */
  2647. function onAutoSlidePlayerClick( event ) {
  2648. // Replay
  2649. if( Reveal.isLastSlide() && config.loop === false ) {
  2650. slide( 0, 0 );
  2651. resumeAutoSlide();
  2652. }
  2653. // Resume
  2654. else if( autoSlidePaused ) {
  2655. resumeAutoSlide();
  2656. }
  2657. // Pause
  2658. else {
  2659. pauseAutoSlide();
  2660. }
  2661. }
  2662. // --------------------------------------------------------------------//
  2663. // ------------------------ PLAYBACK COMPONENT ------------------------//
  2664. // --------------------------------------------------------------------//
  2665. /**
  2666. * Constructor for the playback component, which displays
  2667. * play/pause/progress controls.
  2668. *
  2669. * @param {HTMLElement} container The component will append
  2670. * itself to this
  2671. * @param {Function} progressCheck A method which will be
  2672. * called frequently to get the current progress on a range
  2673. * of 0-1
  2674. */
  2675. function Playback( container, progressCheck ) {
  2676. // Cosmetics
  2677. this.diameter = 50;
  2678. this.thickness = 3;
  2679. // Flags if we are currently playing
  2680. this.playing = false;
  2681. // Current progress on a 0-1 range
  2682. this.progress = 0;
  2683. // Used to loop the animation smoothly
  2684. this.progressOffset = 1;
  2685. this.container = container;
  2686. this.progressCheck = progressCheck;
  2687. this.canvas = document.createElement( 'canvas' );
  2688. this.canvas.className = 'playback';
  2689. this.canvas.width = this.diameter;
  2690. this.canvas.height = this.diameter;
  2691. this.context = this.canvas.getContext( '2d' );
  2692. this.container.appendChild( this.canvas );
  2693. this.render();
  2694. }
  2695. Playback.prototype.setPlaying = function( value ) {
  2696. var wasPlaying = this.playing;
  2697. this.playing = value;
  2698. // Start repainting if we weren't already
  2699. if( !wasPlaying && this.playing ) {
  2700. this.animate();
  2701. }
  2702. else {
  2703. this.render();
  2704. }
  2705. };
  2706. Playback.prototype.animate = function() {
  2707. var progressBefore = this.progress;
  2708. this.progress = this.progressCheck();
  2709. // When we loop, offset the progress so that it eases
  2710. // smoothly rather than immediately resetting
  2711. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  2712. this.progressOffset = this.progress;
  2713. }
  2714. this.render();
  2715. if( this.playing ) {
  2716. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  2717. }
  2718. };
  2719. /**
  2720. * Renders the current progress and playback state.
  2721. */
  2722. Playback.prototype.render = function() {
  2723. var progress = this.playing ? this.progress : 0,
  2724. radius = ( this.diameter / 2 ) - this.thickness,
  2725. x = this.diameter / 2,
  2726. y = this.diameter / 2,
  2727. iconSize = 14;
  2728. // Ease towards 1
  2729. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  2730. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  2731. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  2732. this.context.save();
  2733. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  2734. // Solid background color
  2735. this.context.beginPath();
  2736. this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false );
  2737. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  2738. this.context.fill();
  2739. // Draw progress track
  2740. this.context.beginPath();
  2741. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  2742. this.context.lineWidth = this.thickness;
  2743. this.context.strokeStyle = '#666';
  2744. this.context.stroke();
  2745. if( this.playing ) {
  2746. // Draw progress on top of track
  2747. this.context.beginPath();
  2748. this.context.arc( x, y, radius, startAngle, endAngle, false );
  2749. this.context.lineWidth = this.thickness;
  2750. this.context.strokeStyle = '#fff';
  2751. this.context.stroke();
  2752. }
  2753. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  2754. // Draw play/pause icons
  2755. if( this.playing ) {
  2756. this.context.fillStyle = '#fff';
  2757. this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize );
  2758. this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize );
  2759. }
  2760. else {
  2761. this.context.beginPath();
  2762. this.context.translate( 2, 0 );
  2763. this.context.moveTo( 0, 0 );
  2764. this.context.lineTo( iconSize - 2, iconSize / 2 );
  2765. this.context.lineTo( 0, iconSize );
  2766. this.context.fillStyle = '#fff';
  2767. this.context.fill();
  2768. }
  2769. this.context.restore();
  2770. };
  2771. Playback.prototype.on = function( type, listener ) {
  2772. this.canvas.addEventListener( type, listener, false );
  2773. };
  2774. Playback.prototype.off = function( type, listener ) {
  2775. this.canvas.removeEventListener( type, listener, false );
  2776. };
  2777. Playback.prototype.destroy = function() {
  2778. this.playing = false;
  2779. if( this.canvas.parentNode ) {
  2780. this.container.removeChild( this.canvas );
  2781. }
  2782. };
  2783. // --------------------------------------------------------------------//
  2784. // ------------------------------- API --------------------------------//
  2785. // --------------------------------------------------------------------//
  2786. return {
  2787. initialize: initialize,
  2788. configure: configure,
  2789. sync: sync,
  2790. // Navigation methods
  2791. slide: slide,
  2792. left: navigateLeft,
  2793. right: navigateRight,
  2794. up: navigateUp,
  2795. down: navigateDown,
  2796. prev: navigatePrev,
  2797. next: navigateNext,
  2798. // Fragment methods
  2799. navigateFragment: navigateFragment,
  2800. prevFragment: previousFragment,
  2801. nextFragment: nextFragment,
  2802. // Deprecated aliases
  2803. navigateTo: slide,
  2804. navigateLeft: navigateLeft,
  2805. navigateRight: navigateRight,
  2806. navigateUp: navigateUp,
  2807. navigateDown: navigateDown,
  2808. navigatePrev: navigatePrev,
  2809. navigateNext: navigateNext,
  2810. // Forces an update in slide layout
  2811. layout: layout,
  2812. // Returns an object with the available routes as booleans (left/right/top/bottom)
  2813. availableRoutes: availableRoutes,
  2814. // Returns an object with the available fragments as booleans (prev/next)
  2815. availableFragments: availableFragments,
  2816. // Toggles the overview mode on/off
  2817. toggleOverview: toggleOverview,
  2818. // Toggles the "black screen" mode on/off
  2819. togglePause: togglePause,
  2820. // Toggles the auto slide mode on/off
  2821. toggleAutoSlide: toggleAutoSlide,
  2822. // State checks
  2823. isOverview: isOverview,
  2824. isPaused: isPaused,
  2825. isAutoSliding: isAutoSliding,
  2826. // Adds or removes all internal event listeners (such as keyboard)
  2827. addEventListeners: addEventListeners,
  2828. removeEventListeners: removeEventListeners,
  2829. // Facility for persisting and restoring the presentation state
  2830. getState: getState,
  2831. setState: setState,
  2832. // Presentation progress on range of 0-1
  2833. getProgress: getProgress,
  2834. // Returns the indices of the current, or specified, slide
  2835. getIndices: getIndices,
  2836. getTotalSlides: getTotalSlides,
  2837. // Returns the slide at the specified index, y is optional
  2838. getSlide: function( x, y ) {
  2839. var horizontalSlide = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2840. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2841. if( typeof y !== 'undefined' ) {
  2842. return verticalSlides ? verticalSlides[ y ] : undefined;
  2843. }
  2844. return horizontalSlide;
  2845. },
  2846. // Returns the previous slide element, may be null
  2847. getPreviousSlide: function() {
  2848. return previousSlide;
  2849. },
  2850. // Returns the current slide element
  2851. getCurrentSlide: function() {
  2852. return currentSlide;
  2853. },
  2854. // Returns the current scale of the presentation content
  2855. getScale: function() {
  2856. return scale;
  2857. },
  2858. // Returns the current configuration object
  2859. getConfig: function() {
  2860. return config;
  2861. },
  2862. // Helper method, retrieves query string as a key/value hash
  2863. getQueryHash: function() {
  2864. var query = {};
  2865. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  2866. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  2867. } );
  2868. // Basic deserialization
  2869. for( var i in query ) {
  2870. var value = query[ i ];
  2871. query[ i ] = deserialize( unescape( value ) );
  2872. }
  2873. return query;
  2874. },
  2875. // Returns true if we're currently on the first slide
  2876. isFirstSlide: function() {
  2877. return document.querySelector( SLIDES_SELECTOR + '.past' ) == null ? true : false;
  2878. },
  2879. // Returns true if we're currently on the last slide
  2880. isLastSlide: function() {
  2881. if( currentSlide ) {
  2882. // Does this slide has next a sibling?
  2883. if( currentSlide.nextElementSibling ) return false;
  2884. // If it's vertical, does its parent have a next sibling?
  2885. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  2886. return true;
  2887. }
  2888. return false;
  2889. },
  2890. // Checks if reveal.js has been loaded and is ready for use
  2891. isReady: function() {
  2892. return loaded;
  2893. },
  2894. // Forward event binding to the reveal DOM element
  2895. addEventListener: function( type, listener, useCapture ) {
  2896. if( 'addEventListener' in window ) {
  2897. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  2898. }
  2899. },
  2900. removeEventListener: function( type, listener, useCapture ) {
  2901. if( 'addEventListener' in window ) {
  2902. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  2903. }
  2904. }
  2905. };
  2906. })();