reveal.js 100 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. setupPDF();
  249. }
  250. // Notify listeners that the presentation is ready but use a 1ms
  251. // timeout to ensure it's not fired synchronously after #initialize()
  252. setTimeout( function() {
  253. // Enable transitions now that we're loaded
  254. dom.slides.classList.remove( 'no-transition' );
  255. loaded = true;
  256. dispatchEvent( 'ready', {
  257. 'indexh': indexh,
  258. 'indexv': indexv,
  259. 'currentSlide': currentSlide
  260. } );
  261. }, 1 );
  262. }
  263. /**
  264. * Finds and stores references to DOM elements which are
  265. * required by the presentation. If a required element is
  266. * not found, it is created.
  267. */
  268. function setupDOM() {
  269. // Cache references to key DOM elements
  270. dom.theme = document.querySelector( '#theme' );
  271. dom.wrapper = document.querySelector( '.reveal' );
  272. dom.slides = document.querySelector( '.reveal .slides' );
  273. // Prevent transitions while we're loading
  274. dom.slides.classList.add( 'no-transition' );
  275. // Background element
  276. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  277. // Progress bar
  278. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  279. dom.progressbar = dom.progress.querySelector( 'span' );
  280. // Arrow controls
  281. createSingletonNode( dom.wrapper, 'aside', 'controls',
  282. '<div class="navigate-left"></div>' +
  283. '<div class="navigate-right"></div>' +
  284. '<div class="navigate-up"></div>' +
  285. '<div class="navigate-down"></div>' );
  286. // Slide number
  287. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  288. // State background element [DEPRECATED]
  289. createSingletonNode( dom.wrapper, 'div', 'state-background', null );
  290. // Overlay graphic which is displayed during the paused mode
  291. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  292. // Cache references to elements
  293. dom.controls = document.querySelector( '.reveal .controls' );
  294. // There can be multiple instances of controls throughout the page
  295. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  296. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  297. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  298. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  299. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  300. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  301. }
  302. /**
  303. * Configures the presentation for printing to a static
  304. * PDF.
  305. */
  306. function setupPDF() {
  307. // The aspect ratio of pages when saving to PDF in Chrome,
  308. // we need to abide by this ratio when determining the pixel
  309. // size of our pages
  310. var pageAspectRatio = 1.295;
  311. // Dimensions of the PDF pages
  312. var pageWidth = config.width * 1.3,
  313. pageHeight = Math.round( pageWidth / pageAspectRatio );
  314. // Dimensions of slides within the pages
  315. var slideWidth = config.width,
  316. slideHeight = config.height;
  317. document.body.classList.add( 'print-pdf' );
  318. document.body.style.width = pageWidth + 'px';
  319. document.body.style.height = pageHeight + 'px';
  320. // Slide and slide background layout
  321. toArray( document.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  322. // Vertical stacks are not centred since their section
  323. // children will be
  324. if( slide.classList.contains( 'stack' ) === false ) {
  325. // Center the slide inside of the page, giving the slide some margin
  326. var left = ( pageWidth - slideWidth ) / 2,
  327. top = ( pageHeight - slideHeight ) / 2;
  328. var contentHeight = getAbsoluteHeight( slide );
  329. var numberOfPages = Math.ceil( contentHeight / slideHeight );
  330. // Top align when we're taller than a single page
  331. if( numberOfPages > 1 ) {
  332. top = 0;
  333. }
  334. // Center the slide vertically
  335. else if( config.center || slide.classList.contains( 'center' ) ) {
  336. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  337. }
  338. // Position the slide inside of the page
  339. slide.style.left = left + 'px';
  340. slide.style.top = top + 'px';
  341. slide.style.width = slideWidth + 'px';
  342. slide.style.height = ( slideHeight * numberOfPages ) + 'px';
  343. // TODO Backgrounds need to be multiplied when the slide
  344. // stretches over multiple pages
  345. var background = slide.querySelector( '.slide-background' );
  346. if( background ) {
  347. background.style.width = pageWidth + 'px';
  348. background.style.height = pageHeight + 'px';
  349. background.style.top = -top + 'px';
  350. background.style.left = -left + 'px';
  351. }
  352. }
  353. } );
  354. // Show all fragments
  355. toArray( document.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
  356. fragment.classList.add( 'visible' );
  357. } );
  358. }
  359. /**
  360. * Creates an HTML element and returns a reference to it.
  361. * If the element already exists the existing instance will
  362. * be returned.
  363. */
  364. function createSingletonNode( container, tagname, classname, innerHTML ) {
  365. var node = container.querySelector( '.' + classname );
  366. if( !node ) {
  367. node = document.createElement( tagname );
  368. node.classList.add( classname );
  369. if( innerHTML !== null ) {
  370. node.innerHTML = innerHTML;
  371. }
  372. container.appendChild( node );
  373. }
  374. return node;
  375. }
  376. /**
  377. * Creates the slide background elements and appends them
  378. * to the background container. One element is created per
  379. * slide no matter if the given slide has visible background.
  380. */
  381. function createBackgrounds() {
  382. var printMode = isPrintingPDF();
  383. // Clear prior backgrounds
  384. dom.background.innerHTML = '';
  385. dom.background.classList.add( 'no-transition' );
  386. // Iterate over all horizontal slides
  387. toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  388. var backgroundStack;
  389. if( printMode ) {
  390. backgroundStack = createBackground( slideh, slideh );
  391. }
  392. else {
  393. backgroundStack = createBackground( slideh, dom.background );
  394. }
  395. // Iterate over all vertical slides
  396. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  397. if( printMode ) {
  398. createBackground( slidev, slidev );
  399. }
  400. else {
  401. createBackground( slidev, backgroundStack );
  402. }
  403. } );
  404. } );
  405. // Add parallax background if specified
  406. if( config.parallaxBackgroundImage ) {
  407. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  408. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  409. // Make sure the below properties are set on the element - these properties are
  410. // needed for proper transitions to be set on the element via CSS. To remove
  411. // annoying background slide-in effect when the presentation starts, apply
  412. // these properties after short time delay
  413. setTimeout( function() {
  414. dom.wrapper.classList.add( 'has-parallax-background' );
  415. }, 1 );
  416. }
  417. else {
  418. dom.background.style.backgroundImage = '';
  419. dom.wrapper.classList.remove( 'has-parallax-background' );
  420. }
  421. }
  422. /**
  423. * Creates a background for the given slide.
  424. *
  425. * @param {HTMLElement} slide
  426. * @param {HTMLElement} container The element that the background
  427. * should be appended to
  428. */
  429. function createBackground( slide, container ) {
  430. var data = {
  431. background: slide.getAttribute( 'data-background' ),
  432. backgroundSize: slide.getAttribute( 'data-background-size' ),
  433. backgroundImage: slide.getAttribute( 'data-background-image' ),
  434. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  435. backgroundColor: slide.getAttribute( 'data-background-color' ),
  436. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  437. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  438. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  439. };
  440. var element = document.createElement( 'div' );
  441. // Carry over custom classes from the slide to the background
  442. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  443. if( data.background ) {
  444. // Auto-wrap image urls in url(...)
  445. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
  446. element.style.backgroundImage = 'url('+ data.background +')';
  447. }
  448. else {
  449. element.style.background = data.background;
  450. }
  451. }
  452. // Create a hash for this combination of background settings.
  453. // This is used to determine when two slide backgrounds are
  454. // the same.
  455. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo ) {
  456. element.setAttribute( 'data-background-hash', data.background +
  457. data.backgroundSize +
  458. data.backgroundImage +
  459. data.backgroundVideo +
  460. data.backgroundColor +
  461. data.backgroundRepeat +
  462. data.backgroundPosition +
  463. data.backgroundTransition );
  464. }
  465. // Additional and optional background properties
  466. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  467. if( data.backgroundImage ) element.style.backgroundImage = 'url("' + data.backgroundImage + '")';
  468. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  469. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  470. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  471. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  472. // Create video background element
  473. if( data.backgroundVideo ) {
  474. var video = document.createElement( 'video' );
  475. // Support comma separated lists of video sources
  476. data.backgroundVideo.split( ',' ).forEach( function( source ) {
  477. video.innerHTML += '<source src="'+ source +'">';
  478. } );
  479. element.appendChild( video );
  480. }
  481. container.appendChild( element );
  482. return element;
  483. }
  484. /**
  485. * Registers a listener to postMessage events, this makes it
  486. * possible to call all reveal.js API methods from another
  487. * window. For example:
  488. *
  489. * revealWindow.postMessage( JSON.stringify({
  490. * method: 'slide',
  491. * args: [ 2 ]
  492. * }), '*' );
  493. */
  494. function setupPostMessage() {
  495. if( config.postMessage ) {
  496. window.addEventListener( 'message', function ( event ) {
  497. var data = event.data;
  498. // Make sure we're dealing with JSON
  499. if( data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  500. data = JSON.parse( data );
  501. // Check if the requested method can be found
  502. if( data.method && typeof Reveal[data.method] === 'function' ) {
  503. Reveal[data.method].apply( Reveal, data.args );
  504. }
  505. }
  506. }, false );
  507. }
  508. }
  509. /**
  510. * Applies the configuration settings from the config
  511. * object. May be called multiple times.
  512. */
  513. function configure( options ) {
  514. var numberOfSlides = document.querySelectorAll( SLIDES_SELECTOR ).length;
  515. dom.wrapper.classList.remove( config.transition );
  516. // New config options may be passed when this method
  517. // is invoked through the API after initialization
  518. if( typeof options === 'object' ) extend( config, options );
  519. // Force linear transition based on browser capabilities
  520. if( features.transforms3d === false ) config.transition = 'linear';
  521. dom.wrapper.classList.add( config.transition );
  522. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  523. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  524. dom.controls.style.display = config.controls ? 'block' : 'none';
  525. dom.progress.style.display = config.progress ? 'block' : 'none';
  526. if( config.rtl ) {
  527. dom.wrapper.classList.add( 'rtl' );
  528. }
  529. else {
  530. dom.wrapper.classList.remove( 'rtl' );
  531. }
  532. if( config.center ) {
  533. dom.wrapper.classList.add( 'center' );
  534. }
  535. else {
  536. dom.wrapper.classList.remove( 'center' );
  537. }
  538. if( config.mouseWheel ) {
  539. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  540. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  541. }
  542. else {
  543. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  544. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  545. }
  546. // Rolling 3D links
  547. if( config.rollingLinks ) {
  548. enableRollingLinks();
  549. }
  550. else {
  551. disableRollingLinks();
  552. }
  553. // Iframe link previews
  554. if( config.previewLinks ) {
  555. enablePreviewLinks();
  556. }
  557. else {
  558. disablePreviewLinks();
  559. enablePreviewLinks( '[data-preview-link]' );
  560. }
  561. // Remove existing auto-slide controls
  562. if( autoSlidePlayer ) {
  563. autoSlidePlayer.destroy();
  564. autoSlidePlayer = null;
  565. }
  566. // Generate auto-slide controls if needed
  567. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  568. autoSlidePlayer = new Playback( dom.wrapper, function() {
  569. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  570. } );
  571. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  572. autoSlidePaused = false;
  573. }
  574. // When fragments are turned off they should be visible
  575. if( config.fragments === false ) {
  576. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  577. element.classList.add( 'visible' );
  578. element.classList.remove( 'current-fragment' );
  579. } );
  580. }
  581. // Load the theme in the config, if it's not already loaded
  582. if( config.theme && dom.theme ) {
  583. var themeURL = dom.theme.getAttribute( 'href' );
  584. var themeFinder = /[^\/]*?(?=\.css)/;
  585. var themeName = themeURL.match(themeFinder)[0];
  586. if( config.theme !== themeName ) {
  587. themeURL = themeURL.replace(themeFinder, config.theme);
  588. dom.theme.setAttribute( 'href', themeURL );
  589. }
  590. }
  591. sync();
  592. }
  593. /**
  594. * Binds all event listeners.
  595. */
  596. function addEventListeners() {
  597. eventsAreBound = true;
  598. window.addEventListener( 'hashchange', onWindowHashChange, false );
  599. window.addEventListener( 'resize', onWindowResize, false );
  600. if( config.touch ) {
  601. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  602. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  603. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  604. // Support pointer-style touch interaction as well
  605. if( window.navigator.pointerEnabled ) {
  606. // IE 11 uses un-prefixed version of pointer events
  607. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  608. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  609. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  610. }
  611. else if( window.navigator.msPointerEnabled ) {
  612. // IE 10 uses prefixed version of pointer events
  613. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  614. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  615. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  616. }
  617. }
  618. if( config.keyboard ) {
  619. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  620. }
  621. if( config.progress && dom.progress ) {
  622. dom.progress.addEventListener( 'click', onProgressClicked, false );
  623. }
  624. if( config.focusBodyOnPageVisiblityChange ) {
  625. var visibilityChange;
  626. if( 'hidden' in document ) {
  627. visibilityChange = 'visibilitychange';
  628. }
  629. else if( 'msHidden' in document ) {
  630. visibilityChange = 'msvisibilitychange';
  631. }
  632. else if( 'webkitHidden' in document ) {
  633. visibilityChange = 'webkitvisibilitychange';
  634. }
  635. if( visibilityChange ) {
  636. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  637. }
  638. }
  639. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  640. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  641. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  642. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  643. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  644. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  645. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  646. } );
  647. }
  648. /**
  649. * Unbinds all event listeners.
  650. */
  651. function removeEventListeners() {
  652. eventsAreBound = false;
  653. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  654. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  655. window.removeEventListener( 'resize', onWindowResize, false );
  656. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  657. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  658. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  659. // IE11
  660. if( window.navigator.pointerEnabled ) {
  661. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  662. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  663. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  664. }
  665. // IE10
  666. else if( window.navigator.msPointerEnabled ) {
  667. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  668. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  669. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  670. }
  671. if ( config.progress && dom.progress ) {
  672. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  673. }
  674. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  675. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  676. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  677. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  678. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  679. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  680. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  681. } );
  682. }
  683. /**
  684. * Extend object a with the properties of object b.
  685. * If there's a conflict, object b takes precedence.
  686. */
  687. function extend( a, b ) {
  688. for( var i in b ) {
  689. a[ i ] = b[ i ];
  690. }
  691. }
  692. /**
  693. * Converts the target object to an array.
  694. */
  695. function toArray( o ) {
  696. return Array.prototype.slice.call( o );
  697. }
  698. /**
  699. * Utility for deserializing a value.
  700. */
  701. function deserialize( value ) {
  702. if( typeof value === 'string' ) {
  703. if( value === 'null' ) return null;
  704. else if( value === 'true' ) return true;
  705. else if( value === 'false' ) return false;
  706. else if( value.match( /^\d+$/ ) ) return parseFloat( value );
  707. }
  708. return value;
  709. }
  710. /**
  711. * Measures the distance in pixels between point a
  712. * and point b.
  713. *
  714. * @param {Object} a point with x/y properties
  715. * @param {Object} b point with x/y properties
  716. */
  717. function distanceBetween( a, b ) {
  718. var dx = a.x - b.x,
  719. dy = a.y - b.y;
  720. return Math.sqrt( dx*dx + dy*dy );
  721. }
  722. /**
  723. * Applies a CSS transform to the target element.
  724. */
  725. function transformElement( element, transform ) {
  726. element.style.WebkitTransform = transform;
  727. element.style.MozTransform = transform;
  728. element.style.msTransform = transform;
  729. element.style.OTransform = transform;
  730. element.style.transform = transform;
  731. }
  732. /**
  733. * Retrieves the height of the given element by looking
  734. * at the position and height of its immediate children.
  735. */
  736. function getAbsoluteHeight( element ) {
  737. var height = 0;
  738. if( element ) {
  739. var absoluteChildren = 0;
  740. toArray( element.childNodes ).forEach( function( child ) {
  741. if( typeof child.offsetTop === 'number' && child.style ) {
  742. // Count # of abs children
  743. if( window.getComputedStyle( child ).position === 'absolute' ) {
  744. absoluteChildren += 1;
  745. }
  746. height = Math.max( height, child.offsetTop + child.offsetHeight );
  747. }
  748. } );
  749. // If there are no absolute children, use offsetHeight
  750. if( absoluteChildren === 0 ) {
  751. height = element.offsetHeight;
  752. }
  753. }
  754. return height;
  755. }
  756. /**
  757. * Returns the remaining height within the parent of the
  758. * target element.
  759. *
  760. * remaining height = [ configured parent height ] - [ current parent height ]
  761. */
  762. function getRemainingHeight( element, height ) {
  763. height = height || 0;
  764. if( element ) {
  765. var newHeight, oldHeight = element.style.height;
  766. // Change the .stretch element height to 0 in order find the height of all
  767. // the other elements
  768. element.style.height = '0px';
  769. newHeight = height - element.parentNode.offsetHeight;
  770. // Restore the old height, just in case
  771. element.style.height = oldHeight + 'px';
  772. return newHeight;
  773. }
  774. return height;
  775. }
  776. /**
  777. * Checks if this instance is being used to print a PDF.
  778. */
  779. function isPrintingPDF() {
  780. return ( /print-pdf/gi ).test( window.location.search );
  781. }
  782. /**
  783. * Hides the address bar if we're on a mobile device.
  784. */
  785. function hideAddressBar() {
  786. if( config.hideAddressBar && isMobileDevice ) {
  787. // Events that should trigger the address bar to hide
  788. window.addEventListener( 'load', removeAddressBar, false );
  789. window.addEventListener( 'orientationchange', removeAddressBar, false );
  790. }
  791. }
  792. /**
  793. * Causes the address bar to hide on mobile devices,
  794. * more vertical space ftw.
  795. */
  796. function removeAddressBar() {
  797. setTimeout( function() {
  798. window.scrollTo( 0, 1 );
  799. }, 10 );
  800. }
  801. /**
  802. * Dispatches an event of the specified type from the
  803. * reveal DOM element.
  804. */
  805. function dispatchEvent( type, args ) {
  806. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  807. event.initEvent( type, true, true );
  808. extend( event, args );
  809. dom.wrapper.dispatchEvent( event );
  810. // If we're in an iframe, post each reveal.js event to the
  811. // parent window. Used by the notes plugin
  812. if( config.postMessageEvents && window.parent !== window.self ) {
  813. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  814. }
  815. }
  816. /**
  817. * Wrap all links in 3D goodness.
  818. */
  819. function enableRollingLinks() {
  820. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  821. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a' );
  822. for( var i = 0, len = anchors.length; i < len; i++ ) {
  823. var anchor = anchors[i];
  824. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  825. var span = document.createElement('span');
  826. span.setAttribute('data-title', anchor.text);
  827. span.innerHTML = anchor.innerHTML;
  828. anchor.classList.add( 'roll' );
  829. anchor.innerHTML = '';
  830. anchor.appendChild(span);
  831. }
  832. }
  833. }
  834. }
  835. /**
  836. * Unwrap all 3D links.
  837. */
  838. function disableRollingLinks() {
  839. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  840. for( var i = 0, len = anchors.length; i < len; i++ ) {
  841. var anchor = anchors[i];
  842. var span = anchor.querySelector( 'span' );
  843. if( span ) {
  844. anchor.classList.remove( 'roll' );
  845. anchor.innerHTML = span.innerHTML;
  846. }
  847. }
  848. }
  849. /**
  850. * Bind preview frame links.
  851. */
  852. function enablePreviewLinks( selector ) {
  853. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  854. anchors.forEach( function( element ) {
  855. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  856. element.addEventListener( 'click', onPreviewLinkClicked, false );
  857. }
  858. } );
  859. }
  860. /**
  861. * Unbind preview frame links.
  862. */
  863. function disablePreviewLinks() {
  864. var anchors = toArray( document.querySelectorAll( 'a' ) );
  865. anchors.forEach( function( element ) {
  866. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  867. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  868. }
  869. } );
  870. }
  871. /**
  872. * Opens a preview window for the target URL.
  873. */
  874. function openPreview( url ) {
  875. closePreview();
  876. dom.preview = document.createElement( 'div' );
  877. dom.preview.classList.add( 'preview-link-overlay' );
  878. dom.wrapper.appendChild( dom.preview );
  879. dom.preview.innerHTML = [
  880. '<header>',
  881. '<a class="close" href="#"><span class="icon"></span></a>',
  882. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  883. '</header>',
  884. '<div class="spinner"></div>',
  885. '<div class="viewport">',
  886. '<iframe src="'+ url +'"></iframe>',
  887. '</div>'
  888. ].join('');
  889. dom.preview.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  890. dom.preview.classList.add( 'loaded' );
  891. }, false );
  892. dom.preview.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  893. closePreview();
  894. event.preventDefault();
  895. }, false );
  896. dom.preview.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  897. closePreview();
  898. }, false );
  899. setTimeout( function() {
  900. dom.preview.classList.add( 'visible' );
  901. }, 1 );
  902. }
  903. /**
  904. * Closes the iframe preview window.
  905. */
  906. function closePreview() {
  907. if( dom.preview ) {
  908. dom.preview.setAttribute( 'src', '' );
  909. dom.preview.parentNode.removeChild( dom.preview );
  910. dom.preview = null;
  911. }
  912. }
  913. /**
  914. * Applies JavaScript-controlled layout rules to the
  915. * presentation.
  916. */
  917. function layout() {
  918. if( dom.wrapper && !isPrintingPDF() ) {
  919. // Available space to scale within
  920. var availableWidth = dom.wrapper.offsetWidth,
  921. availableHeight = dom.wrapper.offsetHeight;
  922. // Reduce available space by margin
  923. availableWidth -= ( availableHeight * config.margin );
  924. availableHeight -= ( availableHeight * config.margin );
  925. // Dimensions of the content
  926. var slideWidth = config.width,
  927. slideHeight = config.height,
  928. slidePadding = 20; // TODO Dig this out of DOM
  929. // Layout the contents of the slides
  930. layoutSlideContents( config.width, config.height, slidePadding );
  931. // Slide width may be a percentage of available width
  932. if( typeof slideWidth === 'string' && /%$/.test( slideWidth ) ) {
  933. slideWidth = parseInt( slideWidth, 10 ) / 100 * availableWidth;
  934. }
  935. // Slide height may be a percentage of available height
  936. if( typeof slideHeight === 'string' && /%$/.test( slideHeight ) ) {
  937. slideHeight = parseInt( slideHeight, 10 ) / 100 * availableHeight;
  938. }
  939. dom.slides.style.width = slideWidth + 'px';
  940. dom.slides.style.height = slideHeight + 'px';
  941. // Determine scale of content to fit within available space
  942. scale = Math.min( availableWidth / slideWidth, availableHeight / slideHeight );
  943. // Respect max/min scale settings
  944. scale = Math.max( scale, config.minScale );
  945. scale = Math.min( scale, config.maxScale );
  946. // Prefer zooming in WebKit so that content remains crisp
  947. if( /webkit/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) {
  948. dom.slides.style.zoom = scale;
  949. }
  950. // Apply scale transform as a fallback
  951. else {
  952. dom.slides.style.left = '50%';
  953. dom.slides.style.top = '50%';
  954. dom.slides.style.bottom = 'auto';
  955. dom.slides.style.right = 'auto';
  956. transformElement( dom.slides, 'translate(-50%, -50%) scale('+ scale +')' );
  957. }
  958. // Select all slides, vertical and horizontal
  959. var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
  960. for( var i = 0, len = slides.length; i < len; i++ ) {
  961. var slide = slides[ i ];
  962. // Don't bother updating invisible slides
  963. if( slide.style.display === 'none' ) {
  964. continue;
  965. }
  966. if( config.center || slide.classList.contains( 'center' ) ) {
  967. // Vertical stacks are not centred since their section
  968. // children will be
  969. if( slide.classList.contains( 'stack' ) ) {
  970. slide.style.top = 0;
  971. }
  972. else {
  973. slide.style.top = Math.max( ( ( slideHeight - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
  974. }
  975. }
  976. else {
  977. slide.style.top = '';
  978. }
  979. }
  980. updateProgress();
  981. updateParallax();
  982. }
  983. }
  984. /**
  985. * Applies layout logic to the contents of all slides in
  986. * the presentation.
  987. */
  988. function layoutSlideContents( width, height, padding ) {
  989. // Handle sizing of elements with the 'stretch' class
  990. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  991. // Determine how much vertical space we can use
  992. var remainingHeight = getRemainingHeight( element, height );
  993. // Consider the aspect ratio of media elements
  994. if( /(img|video)/gi.test( element.nodeName ) ) {
  995. var nw = element.naturalWidth || element.videoWidth,
  996. nh = element.naturalHeight || element.videoHeight;
  997. var es = Math.min( width / nw, remainingHeight / nh );
  998. element.style.width = ( nw * es ) + 'px';
  999. element.style.height = ( nh * es ) + 'px';
  1000. }
  1001. else {
  1002. element.style.width = width + 'px';
  1003. element.style.height = remainingHeight + 'px';
  1004. }
  1005. } );
  1006. }
  1007. /**
  1008. * Stores the vertical index of a stack so that the same
  1009. * vertical slide can be selected when navigating to and
  1010. * from the stack.
  1011. *
  1012. * @param {HTMLElement} stack The vertical stack element
  1013. * @param {int} v Index to memorize
  1014. */
  1015. function setPreviousVerticalIndex( stack, v ) {
  1016. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1017. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1018. }
  1019. }
  1020. /**
  1021. * Retrieves the vertical index which was stored using
  1022. * #setPreviousVerticalIndex() or 0 if no previous index
  1023. * exists.
  1024. *
  1025. * @param {HTMLElement} stack The vertical stack element
  1026. */
  1027. function getPreviousVerticalIndex( stack ) {
  1028. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1029. // Prefer manually defined start-indexv
  1030. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1031. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1032. }
  1033. return 0;
  1034. }
  1035. /**
  1036. * Displays the overview of slides (quick nav) by
  1037. * scaling down and arranging all slide elements.
  1038. *
  1039. * Experimental feature, might be dropped if perf
  1040. * can't be improved.
  1041. */
  1042. function activateOverview() {
  1043. // Only proceed if enabled in config
  1044. if( config.overview ) {
  1045. // Don't auto-slide while in overview mode
  1046. cancelAutoSlide();
  1047. var wasActive = dom.wrapper.classList.contains( 'overview' );
  1048. // Vary the depth of the overview based on screen size
  1049. var depth = window.innerWidth < 400 ? 1000 : 2500;
  1050. dom.wrapper.classList.add( 'overview' );
  1051. dom.wrapper.classList.remove( 'overview-deactivating' );
  1052. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1053. for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
  1054. var hslide = horizontalSlides[i],
  1055. hoffset = config.rtl ? -105 : 105;
  1056. hslide.setAttribute( 'data-index-h', i );
  1057. // Apply CSS transform
  1058. transformElement( hslide, 'translateZ(-'+ depth +'px) translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)' );
  1059. if( hslide.classList.contains( 'stack' ) ) {
  1060. var verticalSlides = hslide.querySelectorAll( 'section' );
  1061. for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
  1062. var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );
  1063. var vslide = verticalSlides[j];
  1064. vslide.setAttribute( 'data-index-h', i );
  1065. vslide.setAttribute( 'data-index-v', j );
  1066. // Apply CSS transform
  1067. transformElement( vslide, 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)' );
  1068. // Navigate to this slide on click
  1069. vslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1070. }
  1071. }
  1072. else {
  1073. // Navigate to this slide on click
  1074. hslide.addEventListener( 'click', onOverviewSlideClicked, true );
  1075. }
  1076. }
  1077. updateSlidesVisibility();
  1078. layout();
  1079. if( !wasActive ) {
  1080. // Notify observers of the overview showing
  1081. dispatchEvent( 'overviewshown', {
  1082. 'indexh': indexh,
  1083. 'indexv': indexv,
  1084. 'currentSlide': currentSlide
  1085. } );
  1086. }
  1087. }
  1088. }
  1089. /**
  1090. * Exits the slide overview and enters the currently
  1091. * active slide.
  1092. */
  1093. function deactivateOverview() {
  1094. // Only proceed if enabled in config
  1095. if( config.overview ) {
  1096. dom.wrapper.classList.remove( 'overview' );
  1097. // Temporarily add a class so that transitions can do different things
  1098. // depending on whether they are exiting/entering overview, or just
  1099. // moving from slide to slide
  1100. dom.wrapper.classList.add( 'overview-deactivating' );
  1101. setTimeout( function () {
  1102. dom.wrapper.classList.remove( 'overview-deactivating' );
  1103. }, 1 );
  1104. // Select all slides
  1105. toArray( document.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1106. // Resets all transforms to use the external styles
  1107. transformElement( slide, '' );
  1108. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1109. } );
  1110. slide( indexh, indexv );
  1111. cueAutoSlide();
  1112. // Notify observers of the overview hiding
  1113. dispatchEvent( 'overviewhidden', {
  1114. 'indexh': indexh,
  1115. 'indexv': indexv,
  1116. 'currentSlide': currentSlide
  1117. } );
  1118. }
  1119. }
  1120. /**
  1121. * Toggles the slide overview mode on and off.
  1122. *
  1123. * @param {Boolean} override Optional flag which overrides the
  1124. * toggle logic and forcibly sets the desired state. True means
  1125. * overview is open, false means it's closed.
  1126. */
  1127. function toggleOverview( override ) {
  1128. if( typeof override === 'boolean' ) {
  1129. override ? activateOverview() : deactivateOverview();
  1130. }
  1131. else {
  1132. isOverview() ? deactivateOverview() : activateOverview();
  1133. }
  1134. }
  1135. /**
  1136. * Checks if the overview is currently active.
  1137. *
  1138. * @return {Boolean} true if the overview is active,
  1139. * false otherwise
  1140. */
  1141. function isOverview() {
  1142. return dom.wrapper.classList.contains( 'overview' );
  1143. }
  1144. /**
  1145. * Checks if the current or specified slide is vertical
  1146. * (nested within another slide).
  1147. *
  1148. * @param {HTMLElement} slide [optional] The slide to check
  1149. * orientation of
  1150. */
  1151. function isVerticalSlide( slide ) {
  1152. // Prefer slide argument, otherwise use current slide
  1153. slide = slide ? slide : currentSlide;
  1154. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1155. }
  1156. /**
  1157. * Handling the fullscreen functionality via the fullscreen API
  1158. *
  1159. * @see http://fullscreen.spec.whatwg.org/
  1160. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1161. */
  1162. function enterFullscreen() {
  1163. var element = document.body;
  1164. // Check which implementation is available
  1165. var requestMethod = element.requestFullScreen ||
  1166. element.webkitRequestFullscreen ||
  1167. element.webkitRequestFullScreen ||
  1168. element.mozRequestFullScreen ||
  1169. element.msRequestFullscreen;
  1170. if( requestMethod ) {
  1171. requestMethod.apply( element );
  1172. }
  1173. }
  1174. /**
  1175. * Enters the paused mode which fades everything on screen to
  1176. * black.
  1177. */
  1178. function pause() {
  1179. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1180. cancelAutoSlide();
  1181. dom.wrapper.classList.add( 'paused' );
  1182. if( wasPaused === false ) {
  1183. dispatchEvent( 'paused' );
  1184. }
  1185. }
  1186. /**
  1187. * Exits from the paused mode.
  1188. */
  1189. function resume() {
  1190. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1191. dom.wrapper.classList.remove( 'paused' );
  1192. cueAutoSlide();
  1193. if( wasPaused ) {
  1194. dispatchEvent( 'resumed' );
  1195. }
  1196. }
  1197. /**
  1198. * Toggles the paused mode on and off.
  1199. */
  1200. function togglePause( override ) {
  1201. if( typeof override === 'boolean' ) {
  1202. override ? pause() : resume();
  1203. }
  1204. else {
  1205. isPaused() ? resume() : pause();
  1206. }
  1207. }
  1208. /**
  1209. * Checks if we are currently in the paused mode.
  1210. */
  1211. function isPaused() {
  1212. return dom.wrapper.classList.contains( 'paused' );
  1213. }
  1214. /**
  1215. * Toggles the auto slide mode on and off.
  1216. *
  1217. * @param {Boolean} override Optional flag which sets the desired state.
  1218. * True means autoplay starts, false means it stops.
  1219. */
  1220. function toggleAutoSlide( override ) {
  1221. if( typeof override === 'boolean' ) {
  1222. override ? resumeAutoSlide() : pauseAutoSlide();
  1223. }
  1224. else {
  1225. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  1226. }
  1227. }
  1228. /**
  1229. * Checks if the auto slide mode is currently on.
  1230. */
  1231. function isAutoSliding() {
  1232. return !!( autoSlide && !autoSlidePaused );
  1233. }
  1234. /**
  1235. * Steps from the current point in the presentation to the
  1236. * slide which matches the specified horizontal and vertical
  1237. * indices.
  1238. *
  1239. * @param {int} h Horizontal index of the target slide
  1240. * @param {int} v Vertical index of the target slide
  1241. * @param {int} f Optional index of a fragment within the
  1242. * target slide to activate
  1243. * @param {int} o Optional origin for use in multimaster environments
  1244. */
  1245. function slide( h, v, f, o ) {
  1246. // Remember where we were at before
  1247. previousSlide = currentSlide;
  1248. // Query all horizontal slides in the deck
  1249. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1250. // If no vertical index is specified and the upcoming slide is a
  1251. // stack, resume at its previous vertical index
  1252. if( v === undefined ) {
  1253. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1254. }
  1255. // If we were on a vertical stack, remember what vertical index
  1256. // it was on so we can resume at the same position when returning
  1257. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1258. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1259. }
  1260. // Remember the state before this slide
  1261. var stateBefore = state.concat();
  1262. // Reset the state array
  1263. state.length = 0;
  1264. var indexhBefore = indexh || 0,
  1265. indexvBefore = indexv || 0;
  1266. // Activate and transition to the new slide
  1267. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1268. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1269. // Update the visibility of slides now that the indices have changed
  1270. updateSlidesVisibility();
  1271. layout();
  1272. // Apply the new state
  1273. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1274. // Check if this state existed on the previous slide. If it
  1275. // did, we will avoid adding it repeatedly
  1276. for( var j = 0; j < stateBefore.length; j++ ) {
  1277. if( stateBefore[j] === state[i] ) {
  1278. stateBefore.splice( j, 1 );
  1279. continue stateLoop;
  1280. }
  1281. }
  1282. document.documentElement.classList.add( state[i] );
  1283. // Dispatch custom event matching the state's name
  1284. dispatchEvent( state[i] );
  1285. }
  1286. // Clean up the remains of the previous state
  1287. while( stateBefore.length ) {
  1288. document.documentElement.classList.remove( stateBefore.pop() );
  1289. }
  1290. // If the overview is active, re-activate it to update positions
  1291. if( isOverview() ) {
  1292. activateOverview();
  1293. }
  1294. // Find the current horizontal slide and any possible vertical slides
  1295. // within it
  1296. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1297. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1298. // Store references to the previous and current slides
  1299. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1300. // Show fragment, if specified
  1301. if( typeof f !== 'undefined' ) {
  1302. navigateFragment( f );
  1303. }
  1304. // Dispatch an event if the slide changed
  1305. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1306. if( slideChanged ) {
  1307. dispatchEvent( 'slidechanged', {
  1308. 'indexh': indexh,
  1309. 'indexv': indexv,
  1310. 'previousSlide': previousSlide,
  1311. 'currentSlide': currentSlide,
  1312. 'origin': o
  1313. } );
  1314. }
  1315. else {
  1316. // Ensure that the previous slide is never the same as the current
  1317. previousSlide = null;
  1318. }
  1319. // Solves an edge case where the previous slide maintains the
  1320. // 'present' class when navigating between adjacent vertical
  1321. // stacks
  1322. if( previousSlide ) {
  1323. previousSlide.classList.remove( 'present' );
  1324. // Reset all slides upon navigate to home
  1325. // Issue: #285
  1326. if ( document.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1327. // Launch async task
  1328. setTimeout( function () {
  1329. var slides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1330. for( i in slides ) {
  1331. if( slides[i] ) {
  1332. // Reset stack
  1333. setPreviousVerticalIndex( slides[i], 0 );
  1334. }
  1335. }
  1336. }, 0 );
  1337. }
  1338. }
  1339. // Handle embedded content
  1340. if( slideChanged ) {
  1341. stopEmbeddedContent( previousSlide );
  1342. startEmbeddedContent( currentSlide );
  1343. }
  1344. updateControls();
  1345. updateProgress();
  1346. updateBackground();
  1347. updateParallax();
  1348. updateSlideNumber();
  1349. // Update the URL hash
  1350. writeURL();
  1351. cueAutoSlide();
  1352. }
  1353. /**
  1354. * Syncs the presentation with the current DOM. Useful
  1355. * when new slides or control elements are added or when
  1356. * the configuration has changed.
  1357. */
  1358. function sync() {
  1359. // Subscribe to input
  1360. removeEventListeners();
  1361. addEventListeners();
  1362. // Force a layout to make sure the current config is accounted for
  1363. layout();
  1364. // Reflect the current autoSlide value
  1365. autoSlide = config.autoSlide;
  1366. // Start auto-sliding if it's enabled
  1367. cueAutoSlide();
  1368. // Re-create the slide backgrounds
  1369. createBackgrounds();
  1370. sortAllFragments();
  1371. updateControls();
  1372. updateProgress();
  1373. updateBackground( true );
  1374. updateSlideNumber();
  1375. }
  1376. /**
  1377. * Resets all vertical slides so that only the first
  1378. * is visible.
  1379. */
  1380. function resetVerticalSlides() {
  1381. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1382. horizontalSlides.forEach( function( horizontalSlide ) {
  1383. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1384. verticalSlides.forEach( function( verticalSlide, y ) {
  1385. if( y > 0 ) {
  1386. verticalSlide.classList.remove( 'present' );
  1387. verticalSlide.classList.remove( 'past' );
  1388. verticalSlide.classList.add( 'future' );
  1389. }
  1390. } );
  1391. } );
  1392. }
  1393. /**
  1394. * Sorts and formats all of fragments in the
  1395. * presentation.
  1396. */
  1397. function sortAllFragments() {
  1398. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1399. horizontalSlides.forEach( function( horizontalSlide ) {
  1400. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1401. verticalSlides.forEach( function( verticalSlide, y ) {
  1402. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  1403. } );
  1404. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  1405. } );
  1406. }
  1407. /**
  1408. * Updates one dimension of slides by showing the slide
  1409. * with the specified index.
  1410. *
  1411. * @param {String} selector A CSS selector that will fetch
  1412. * the group of slides we are working with
  1413. * @param {Number} index The index of the slide that should be
  1414. * shown
  1415. *
  1416. * @return {Number} The index of the slide that is now shown,
  1417. * might differ from the passed in index if it was out of
  1418. * bounds.
  1419. */
  1420. function updateSlides( selector, index ) {
  1421. // Select all slides and convert the NodeList result to
  1422. // an array
  1423. var slides = toArray( document.querySelectorAll( selector ) ),
  1424. slidesLength = slides.length;
  1425. var printMode = isPrintingPDF();
  1426. if( slidesLength ) {
  1427. // Should the index loop?
  1428. if( config.loop ) {
  1429. index %= slidesLength;
  1430. if( index < 0 ) {
  1431. index = slidesLength + index;
  1432. }
  1433. }
  1434. // Enforce max and minimum index bounds
  1435. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1436. for( var i = 0; i < slidesLength; i++ ) {
  1437. var element = slides[i];
  1438. var reverse = config.rtl && !isVerticalSlide( element );
  1439. element.classList.remove( 'past' );
  1440. element.classList.remove( 'present' );
  1441. element.classList.remove( 'future' );
  1442. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1443. element.setAttribute( 'hidden', '' );
  1444. // If this element contains vertical slides
  1445. if( element.querySelector( 'section' ) ) {
  1446. element.classList.add( 'stack' );
  1447. }
  1448. // If we're printing static slides, all slides are "present"
  1449. if( printMode ) {
  1450. element.classList.add( 'present' );
  1451. continue;
  1452. }
  1453. if( i < index ) {
  1454. // Any element previous to index is given the 'past' class
  1455. element.classList.add( reverse ? 'future' : 'past' );
  1456. if( config.fragments ) {
  1457. var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
  1458. // Show all fragments on prior slides
  1459. while( pastFragments.length ) {
  1460. var pastFragment = pastFragments.pop();
  1461. pastFragment.classList.add( 'visible' );
  1462. pastFragment.classList.remove( 'current-fragment' );
  1463. }
  1464. }
  1465. }
  1466. else if( i > index ) {
  1467. // Any element subsequent to index is given the 'future' class
  1468. element.classList.add( reverse ? 'past' : 'future' );
  1469. if( config.fragments ) {
  1470. var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1471. // No fragments in future slides should be visible ahead of time
  1472. while( futureFragments.length ) {
  1473. var futureFragment = futureFragments.pop();
  1474. futureFragment.classList.remove( 'visible' );
  1475. futureFragment.classList.remove( 'current-fragment' );
  1476. }
  1477. }
  1478. }
  1479. }
  1480. // Mark the current slide as present
  1481. slides[index].classList.add( 'present' );
  1482. slides[index].removeAttribute( 'hidden' );
  1483. // If this slide has a state associated with it, add it
  1484. // onto the current state of the deck
  1485. var slideState = slides[index].getAttribute( 'data-state' );
  1486. if( slideState ) {
  1487. state = state.concat( slideState.split( ' ' ) );
  1488. }
  1489. }
  1490. else {
  1491. // Since there are no slides we can't be anywhere beyond the
  1492. // zeroth index
  1493. index = 0;
  1494. }
  1495. return index;
  1496. }
  1497. /**
  1498. * Optimization method; hide all slides that are far away
  1499. * from the present slide.
  1500. */
  1501. function updateSlidesVisibility() {
  1502. // Select all slides and convert the NodeList result to
  1503. // an array
  1504. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1505. horizontalSlidesLength = horizontalSlides.length,
  1506. distanceX,
  1507. distanceY;
  1508. if( horizontalSlidesLength ) {
  1509. // The number of steps away from the present slide that will
  1510. // be visible
  1511. var viewDistance = isOverview() ? 10 : config.viewDistance;
  1512. // Limit view distance on weaker devices
  1513. if( isMobileDevice ) {
  1514. viewDistance = isOverview() ? 6 : 1;
  1515. }
  1516. // Limit view distance on weaker devices
  1517. if( isPrintingPDF() ) {
  1518. viewDistance = Number.MAX_VALUE;
  1519. }
  1520. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1521. var horizontalSlide = horizontalSlides[x];
  1522. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1523. verticalSlidesLength = verticalSlides.length;
  1524. // Loops so that it measures 1 between the first and last slides
  1525. distanceX = Math.abs( ( indexh - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1526. // Show the horizontal slide if it's within the view distance
  1527. if( distanceX < viewDistance ) {
  1528. horizontalSlide.style.display = 'block';
  1529. loadSlide( horizontalSlide );
  1530. }
  1531. else {
  1532. horizontalSlide.style.display = 'none';
  1533. }
  1534. if( verticalSlidesLength ) {
  1535. var oy = getPreviousVerticalIndex( horizontalSlide );
  1536. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1537. var verticalSlide = verticalSlides[y];
  1538. distanceY = x === indexh ? Math.abs( indexv - y ) : Math.abs( y - oy );
  1539. if( distanceX + distanceY < viewDistance ) {
  1540. verticalSlide.style.display = 'block';
  1541. loadSlide( verticalSlide );
  1542. }
  1543. else {
  1544. verticalSlide.style.display = 'none';
  1545. }
  1546. }
  1547. }
  1548. }
  1549. }
  1550. }
  1551. /**
  1552. * Updates the progress bar to reflect the current slide.
  1553. */
  1554. function updateProgress() {
  1555. // Update progress if enabled
  1556. if( config.progress && dom.progress ) {
  1557. dom.progressbar.style.width = getProgress() * window.innerWidth + 'px';
  1558. }
  1559. }
  1560. /**
  1561. * Updates the slide number div to reflect the current slide.
  1562. */
  1563. function updateSlideNumber() {
  1564. // Update slide number if enabled
  1565. if( config.slideNumber && dom.slideNumber) {
  1566. // Display the number of the page using 'indexh - indexv' format
  1567. var indexString = indexh;
  1568. if( indexv > 0 ) {
  1569. indexString += ' - ' + indexv;
  1570. }
  1571. dom.slideNumber.innerHTML = indexString;
  1572. }
  1573. }
  1574. /**
  1575. * Updates the state of all control/navigation arrows.
  1576. */
  1577. function updateControls() {
  1578. var routes = availableRoutes();
  1579. var fragments = availableFragments();
  1580. // Remove the 'enabled' class from all directions
  1581. dom.controlsLeft.concat( dom.controlsRight )
  1582. .concat( dom.controlsUp )
  1583. .concat( dom.controlsDown )
  1584. .concat( dom.controlsPrev )
  1585. .concat( dom.controlsNext ).forEach( function( node ) {
  1586. node.classList.remove( 'enabled' );
  1587. node.classList.remove( 'fragmented' );
  1588. } );
  1589. // Add the 'enabled' class to the available routes
  1590. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1591. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1592. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1593. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1594. // Prev/next buttons
  1595. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1596. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1597. // Highlight fragment directions
  1598. if( currentSlide ) {
  1599. // Always apply fragment decorator to prev/next buttons
  1600. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1601. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1602. // Apply fragment decorators to directional buttons based on
  1603. // what slide axis they are in
  1604. if( isVerticalSlide( currentSlide ) ) {
  1605. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1606. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1607. }
  1608. else {
  1609. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1610. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1611. }
  1612. }
  1613. }
  1614. /**
  1615. * Updates the background elements to reflect the current
  1616. * slide.
  1617. *
  1618. * @param {Boolean} includeAll If true, the backgrounds of
  1619. * all vertical slides (not just the present) will be updated.
  1620. */
  1621. function updateBackground( includeAll ) {
  1622. var currentBackground = null;
  1623. // Reverse past/future classes when in RTL mode
  1624. var horizontalPast = config.rtl ? 'future' : 'past',
  1625. horizontalFuture = config.rtl ? 'past' : 'future';
  1626. // Update the classes of all backgrounds to match the
  1627. // states of their slides (past/present/future)
  1628. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  1629. backgroundh.classList.remove( 'past' );
  1630. backgroundh.classList.remove( 'present' );
  1631. backgroundh.classList.remove( 'future' );
  1632. if( h < indexh ) {
  1633. backgroundh.classList.add( horizontalPast );
  1634. }
  1635. else if ( h > indexh ) {
  1636. backgroundh.classList.add( horizontalFuture );
  1637. }
  1638. else {
  1639. backgroundh.classList.add( 'present' );
  1640. // Store a reference to the current background element
  1641. currentBackground = backgroundh;
  1642. }
  1643. if( includeAll || h === indexh ) {
  1644. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  1645. backgroundv.classList.remove( 'past' );
  1646. backgroundv.classList.remove( 'present' );
  1647. backgroundv.classList.remove( 'future' );
  1648. if( v < indexv ) {
  1649. backgroundv.classList.add( 'past' );
  1650. }
  1651. else if ( v > indexv ) {
  1652. backgroundv.classList.add( 'future' );
  1653. }
  1654. else {
  1655. backgroundv.classList.add( 'present' );
  1656. // Only if this is the present horizontal and vertical slide
  1657. if( h === indexh ) currentBackground = backgroundv;
  1658. }
  1659. } );
  1660. }
  1661. } );
  1662. // Stop any currently playing video background
  1663. if( previousBackground ) {
  1664. var previousVideo = previousBackground.querySelector( 'video' );
  1665. if( previousVideo ) previousVideo.pause();
  1666. }
  1667. if( currentBackground ) {
  1668. // Start video playback
  1669. var currentVideo = currentBackground.querySelector( 'video' );
  1670. if( currentVideo ) currentVideo.play();
  1671. // Don't transition between identical backgrounds. This
  1672. // prevents unwanted flicker.
  1673. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  1674. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  1675. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  1676. dom.background.classList.add( 'no-transition' );
  1677. }
  1678. previousBackground = currentBackground;
  1679. }
  1680. // Allow the first background to apply without transition
  1681. setTimeout( function() {
  1682. dom.background.classList.remove( 'no-transition' );
  1683. }, 1 );
  1684. }
  1685. /**
  1686. * Updates the position of the parallax background based
  1687. * on the current slide index.
  1688. */
  1689. function updateParallax() {
  1690. if( config.parallaxBackgroundImage ) {
  1691. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1692. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1693. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  1694. backgroundWidth, backgroundHeight;
  1695. if( backgroundSize.length === 1 ) {
  1696. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  1697. }
  1698. else {
  1699. backgroundWidth = parseInt( backgroundSize[0], 10 );
  1700. backgroundHeight = parseInt( backgroundSize[1], 10 );
  1701. }
  1702. var slideWidth = dom.background.offsetWidth;
  1703. var horizontalSlideCount = horizontalSlides.length;
  1704. var horizontalOffset = -( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) * indexh;
  1705. var slideHeight = dom.background.offsetHeight;
  1706. var verticalSlideCount = verticalSlides.length;
  1707. var verticalOffset = verticalSlideCount > 1 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0;
  1708. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
  1709. }
  1710. }
  1711. /**
  1712. * Loads any content that is set to load lazily (data-src)
  1713. * inside of the given slide.
  1714. */
  1715. function loadSlide( slide ) {
  1716. // Media elements with data-src attributes
  1717. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  1718. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  1719. element.removeAttribute( 'data-src' );
  1720. } );
  1721. // Media elements with multiple <source>s
  1722. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  1723. var sources = 0;
  1724. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  1725. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  1726. source.removeAttribute( 'data-src' );
  1727. sources += 1;
  1728. } );
  1729. // If we rewrote sources for this video/audio element, we need
  1730. // to manually tell it to load from its new origin
  1731. if( sources > 0 ) {
  1732. media.load();
  1733. }
  1734. } );
  1735. }
  1736. /**
  1737. * Determine what available routes there are for navigation.
  1738. *
  1739. * @return {Object} containing four booleans: left/right/up/down
  1740. */
  1741. function availableRoutes() {
  1742. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1743. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1744. var routes = {
  1745. left: indexh > 0 || config.loop,
  1746. right: indexh < horizontalSlides.length - 1 || config.loop,
  1747. up: indexv > 0,
  1748. down: indexv < verticalSlides.length - 1
  1749. };
  1750. // reverse horizontal controls for rtl
  1751. if( config.rtl ) {
  1752. var left = routes.left;
  1753. routes.left = routes.right;
  1754. routes.right = left;
  1755. }
  1756. return routes;
  1757. }
  1758. /**
  1759. * Returns an object describing the available fragment
  1760. * directions.
  1761. *
  1762. * @return {Object} two boolean properties: prev/next
  1763. */
  1764. function availableFragments() {
  1765. if( currentSlide && config.fragments ) {
  1766. var fragments = currentSlide.querySelectorAll( '.fragment' );
  1767. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  1768. return {
  1769. prev: fragments.length - hiddenFragments.length > 0,
  1770. next: !!hiddenFragments.length
  1771. };
  1772. }
  1773. else {
  1774. return { prev: false, next: false };
  1775. }
  1776. }
  1777. /**
  1778. * Start playback of any embedded content inside of
  1779. * the targeted slide.
  1780. */
  1781. function startEmbeddedContent( slide ) {
  1782. if( slide && !isSpeakerNotes() ) {
  1783. // HTML5 media elements
  1784. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1785. if( el.hasAttribute( 'data-autoplay' ) ) {
  1786. el.play();
  1787. }
  1788. } );
  1789. // iframe embeds
  1790. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  1791. el.contentWindow.postMessage( 'slide:start', '*' );
  1792. });
  1793. // YouTube embeds
  1794. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1795. if( el.hasAttribute( 'data-autoplay' ) ) {
  1796. el.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  1797. }
  1798. });
  1799. }
  1800. }
  1801. /**
  1802. * Stop playback of any embedded content inside of
  1803. * the targeted slide.
  1804. */
  1805. function stopEmbeddedContent( slide ) {
  1806. if( slide ) {
  1807. // HTML5 media elements
  1808. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1809. if( !el.hasAttribute( 'data-ignore' ) ) {
  1810. el.pause();
  1811. }
  1812. } );
  1813. // iframe embeds
  1814. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  1815. el.contentWindow.postMessage( 'slide:stop', '*' );
  1816. });
  1817. // YouTube embeds
  1818. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1819. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  1820. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  1821. }
  1822. });
  1823. }
  1824. }
  1825. /**
  1826. * Returns a value ranging from 0-1 that represents
  1827. * how far into the presentation we have navigated.
  1828. */
  1829. function getProgress() {
  1830. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1831. // The number of past and total slides
  1832. var totalCount = document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  1833. var pastCount = 0;
  1834. // Step through all slides and count the past ones
  1835. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  1836. var horizontalSlide = horizontalSlides[i];
  1837. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1838. for( var j = 0; j < verticalSlides.length; j++ ) {
  1839. // Stop as soon as we arrive at the present
  1840. if( verticalSlides[j].classList.contains( 'present' ) ) {
  1841. break mainLoop;
  1842. }
  1843. pastCount++;
  1844. }
  1845. // Stop as soon as we arrive at the present
  1846. if( horizontalSlide.classList.contains( 'present' ) ) {
  1847. break;
  1848. }
  1849. // Don't count the wrapping section for vertical slides
  1850. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  1851. pastCount++;
  1852. }
  1853. }
  1854. if( currentSlide ) {
  1855. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  1856. // If there are fragments in the current slide those should be
  1857. // accounted for in the progress.
  1858. if( allFragments.length > 0 ) {
  1859. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  1860. // This value represents how big a portion of the slide progress
  1861. // that is made up by its fragments (0-1)
  1862. var fragmentWeight = 0.9;
  1863. // Add fragment progress to the past slide count
  1864. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  1865. }
  1866. }
  1867. return pastCount / ( totalCount - 1 );
  1868. }
  1869. /**
  1870. * Checks if this presentation is running inside of the
  1871. * speaker notes window.
  1872. */
  1873. function isSpeakerNotes() {
  1874. return !!window.location.search.match( /receiver/gi );
  1875. }
  1876. /**
  1877. * Reads the current URL (hash) and navigates accordingly.
  1878. */
  1879. function readURL() {
  1880. var hash = window.location.hash;
  1881. // Attempt to parse the hash as either an index or name
  1882. var bits = hash.slice( 2 ).split( '/' ),
  1883. name = hash.replace( /#|\//gi, '' );
  1884. // If the first bit is invalid and there is a name we can
  1885. // assume that this is a named link
  1886. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  1887. var element;
  1888. try {
  1889. // Find the slide with the specified name
  1890. element = document.querySelector( '#' + name );
  1891. }
  1892. catch( e ) {
  1893. // If the ID is an invalid selector a harmless SyntaxError
  1894. // may be thrown here.
  1895. }
  1896. if( element ) {
  1897. // Find the position of the named slide and navigate to it
  1898. var indices = Reveal.getIndices( element );
  1899. slide( indices.h, indices.v );
  1900. }
  1901. // If the slide doesn't exist, navigate to the current slide
  1902. else {
  1903. slide( indexh || 0, indexv || 0 );
  1904. }
  1905. }
  1906. else {
  1907. // Read the index components of the hash
  1908. var h = parseInt( bits[0], 10 ) || 0,
  1909. v = parseInt( bits[1], 10 ) || 0;
  1910. if( h !== indexh || v !== indexv ) {
  1911. slide( h, v );
  1912. }
  1913. }
  1914. }
  1915. /**
  1916. * Updates the page URL (hash) to reflect the current
  1917. * state.
  1918. *
  1919. * @param {Number} delay The time in ms to wait before
  1920. * writing the hash
  1921. */
  1922. function writeURL( delay ) {
  1923. if( config.history ) {
  1924. // Make sure there's never more than one timeout running
  1925. clearTimeout( writeURLTimeout );
  1926. // If a delay is specified, timeout this call
  1927. if( typeof delay === 'number' ) {
  1928. writeURLTimeout = setTimeout( writeURL, delay );
  1929. }
  1930. else {
  1931. var url = '/';
  1932. // Attempt to create a named link based on the slide's ID
  1933. var id = currentSlide.getAttribute( 'id' );
  1934. if( id ) {
  1935. id = id.toLowerCase();
  1936. id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
  1937. }
  1938. // If the current slide has an ID, use that as a named link
  1939. if( currentSlide && typeof id === 'string' && id.length ) {
  1940. url = '/' + id;
  1941. }
  1942. // Otherwise use the /h/v index
  1943. else {
  1944. if( indexh > 0 || indexv > 0 ) url += indexh;
  1945. if( indexv > 0 ) url += '/' + indexv;
  1946. }
  1947. window.location.hash = url;
  1948. }
  1949. }
  1950. }
  1951. /**
  1952. * Retrieves the h/v location of the current, or specified,
  1953. * slide.
  1954. *
  1955. * @param {HTMLElement} slide If specified, the returned
  1956. * index will be for this slide rather than the currently
  1957. * active one
  1958. *
  1959. * @return {Object} { h: <int>, v: <int>, f: <int> }
  1960. */
  1961. function getIndices( slide ) {
  1962. // By default, return the current indices
  1963. var h = indexh,
  1964. v = indexv,
  1965. f;
  1966. // If a slide is specified, return the indices of that slide
  1967. if( slide ) {
  1968. var isVertical = isVerticalSlide( slide );
  1969. var slideh = isVertical ? slide.parentNode : slide;
  1970. // Select all horizontal slides
  1971. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1972. // Now that we know which the horizontal slide is, get its index
  1973. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  1974. // If this is a vertical slide, grab the vertical index
  1975. if( isVertical ) {
  1976. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  1977. }
  1978. }
  1979. if( !slide && currentSlide ) {
  1980. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  1981. if( hasFragments ) {
  1982. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  1983. f = visibleFragments.length - 1;
  1984. }
  1985. }
  1986. return { h: h, v: v, f: f };
  1987. }
  1988. /**
  1989. * Retrieves the total number of slides in this presentation.
  1990. */
  1991. function getTotalSlides() {
  1992. return document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  1993. }
  1994. /**
  1995. * Retrieves the current state of the presentation as
  1996. * an object. This state can then be restored at any
  1997. * time.
  1998. */
  1999. function getState() {
  2000. var indices = getIndices();
  2001. return {
  2002. indexh: indices.h,
  2003. indexv: indices.v,
  2004. indexf: indices.f,
  2005. paused: isPaused(),
  2006. overview: isOverview()
  2007. };
  2008. }
  2009. /**
  2010. * Restores the presentation to the given state.
  2011. *
  2012. * @param {Object} state As generated by getState()
  2013. */
  2014. function setState( state ) {
  2015. if( typeof state === 'object' ) {
  2016. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  2017. var pausedFlag = deserialize( state.paused ),
  2018. overviewFlag = deserialize( state.overview );
  2019. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  2020. togglePause( pausedFlag );
  2021. }
  2022. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  2023. toggleOverview( overviewFlag );
  2024. }
  2025. }
  2026. }
  2027. /**
  2028. * Return a sorted fragments list, ordered by an increasing
  2029. * "data-fragment-index" attribute.
  2030. *
  2031. * Fragments will be revealed in the order that they are returned by
  2032. * this function, so you can use the index attributes to control the
  2033. * order of fragment appearance.
  2034. *
  2035. * To maintain a sensible default fragment order, fragments are presumed
  2036. * to be passed in document order. This function adds a "fragment-index"
  2037. * attribute to each node if such an attribute is not already present,
  2038. * and sets that attribute to an integer value which is the position of
  2039. * the fragment within the fragments list.
  2040. */
  2041. function sortFragments( fragments ) {
  2042. fragments = toArray( fragments );
  2043. var ordered = [],
  2044. unordered = [],
  2045. sorted = [];
  2046. // Group ordered and unordered elements
  2047. fragments.forEach( function( fragment, i ) {
  2048. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  2049. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  2050. if( !ordered[index] ) {
  2051. ordered[index] = [];
  2052. }
  2053. ordered[index].push( fragment );
  2054. }
  2055. else {
  2056. unordered.push( [ fragment ] );
  2057. }
  2058. } );
  2059. // Append fragments without explicit indices in their
  2060. // DOM order
  2061. ordered = ordered.concat( unordered );
  2062. // Manually count the index up per group to ensure there
  2063. // are no gaps
  2064. var index = 0;
  2065. // Push all fragments in their sorted order to an array,
  2066. // this flattens the groups
  2067. ordered.forEach( function( group ) {
  2068. group.forEach( function( fragment ) {
  2069. sorted.push( fragment );
  2070. fragment.setAttribute( 'data-fragment-index', index );
  2071. } );
  2072. index ++;
  2073. } );
  2074. return sorted;
  2075. }
  2076. /**
  2077. * Navigate to the specified slide fragment.
  2078. *
  2079. * @param {Number} index The index of the fragment that
  2080. * should be shown, -1 means all are invisible
  2081. * @param {Number} offset Integer offset to apply to the
  2082. * fragment index
  2083. *
  2084. * @return {Boolean} true if a change was made in any
  2085. * fragments visibility as part of this call
  2086. */
  2087. function navigateFragment( index, offset ) {
  2088. if( currentSlide && config.fragments ) {
  2089. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  2090. if( fragments.length ) {
  2091. // If no index is specified, find the current
  2092. if( typeof index !== 'number' ) {
  2093. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  2094. if( lastVisibleFragment ) {
  2095. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  2096. }
  2097. else {
  2098. index = -1;
  2099. }
  2100. }
  2101. // If an offset is specified, apply it to the index
  2102. if( typeof offset === 'number' ) {
  2103. index += offset;
  2104. }
  2105. var fragmentsShown = [],
  2106. fragmentsHidden = [];
  2107. toArray( fragments ).forEach( function( element, i ) {
  2108. if( element.hasAttribute( 'data-fragment-index' ) ) {
  2109. i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
  2110. }
  2111. // Visible fragments
  2112. if( i <= index ) {
  2113. if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
  2114. element.classList.add( 'visible' );
  2115. element.classList.remove( 'current-fragment' );
  2116. if( i === index ) {
  2117. element.classList.add( 'current-fragment' );
  2118. }
  2119. }
  2120. // Hidden fragments
  2121. else {
  2122. if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
  2123. element.classList.remove( 'visible' );
  2124. element.classList.remove( 'current-fragment' );
  2125. }
  2126. } );
  2127. if( fragmentsHidden.length ) {
  2128. dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
  2129. }
  2130. if( fragmentsShown.length ) {
  2131. dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
  2132. }
  2133. updateControls();
  2134. updateProgress();
  2135. return !!( fragmentsShown.length || fragmentsHidden.length );
  2136. }
  2137. }
  2138. return false;
  2139. }
  2140. /**
  2141. * Navigate to the next slide fragment.
  2142. *
  2143. * @return {Boolean} true if there was a next fragment,
  2144. * false otherwise
  2145. */
  2146. function nextFragment() {
  2147. return navigateFragment( null, 1 );
  2148. }
  2149. /**
  2150. * Navigate to the previous slide fragment.
  2151. *
  2152. * @return {Boolean} true if there was a previous fragment,
  2153. * false otherwise
  2154. */
  2155. function previousFragment() {
  2156. return navigateFragment( null, -1 );
  2157. }
  2158. /**
  2159. * Cues a new automated slide if enabled in the config.
  2160. */
  2161. function cueAutoSlide() {
  2162. cancelAutoSlide();
  2163. if( currentSlide ) {
  2164. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2165. var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null;
  2166. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  2167. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  2168. // Pick value in the following priority order:
  2169. // 1. Current fragment's data-autoslide
  2170. // 2. Current slide's data-autoslide
  2171. // 3. Parent slide's data-autoslide
  2172. // 4. Global autoSlide setting
  2173. if( fragmentAutoSlide ) {
  2174. autoSlide = parseInt( fragmentAutoSlide, 10 );
  2175. }
  2176. else if( slideAutoSlide ) {
  2177. autoSlide = parseInt( slideAutoSlide, 10 );
  2178. }
  2179. else if( parentAutoSlide ) {
  2180. autoSlide = parseInt( parentAutoSlide, 10 );
  2181. }
  2182. else {
  2183. autoSlide = config.autoSlide;
  2184. }
  2185. // If there are media elements with data-autoplay,
  2186. // automatically set the autoSlide duration to the
  2187. // length of that media
  2188. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2189. if( el.hasAttribute( 'data-autoplay' ) ) {
  2190. if( autoSlide && el.duration * 1000 > autoSlide ) {
  2191. autoSlide = ( el.duration * 1000 ) + 1000;
  2192. }
  2193. }
  2194. } );
  2195. // Cue the next auto-slide if:
  2196. // - There is an autoSlide value
  2197. // - Auto-sliding isn't paused by the user
  2198. // - The presentation isn't paused
  2199. // - The overview isn't active
  2200. // - The presentation isn't over
  2201. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || config.loop === true ) ) {
  2202. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  2203. autoSlideStartTime = Date.now();
  2204. }
  2205. if( autoSlidePlayer ) {
  2206. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  2207. }
  2208. }
  2209. }
  2210. /**
  2211. * Cancels any ongoing request to auto-slide.
  2212. */
  2213. function cancelAutoSlide() {
  2214. clearTimeout( autoSlideTimeout );
  2215. autoSlideTimeout = -1;
  2216. }
  2217. function pauseAutoSlide() {
  2218. if( autoSlide && !autoSlidePaused ) {
  2219. autoSlidePaused = true;
  2220. dispatchEvent( 'autoslidepaused' );
  2221. clearTimeout( autoSlideTimeout );
  2222. if( autoSlidePlayer ) {
  2223. autoSlidePlayer.setPlaying( false );
  2224. }
  2225. }
  2226. }
  2227. function resumeAutoSlide() {
  2228. if( autoSlide && autoSlidePaused ) {
  2229. autoSlidePaused = false;
  2230. dispatchEvent( 'autoslideresumed' );
  2231. cueAutoSlide();
  2232. }
  2233. }
  2234. function navigateLeft() {
  2235. // Reverse for RTL
  2236. if( config.rtl ) {
  2237. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  2238. slide( indexh + 1 );
  2239. }
  2240. }
  2241. // Normal navigation
  2242. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  2243. slide( indexh - 1 );
  2244. }
  2245. }
  2246. function navigateRight() {
  2247. // Reverse for RTL
  2248. if( config.rtl ) {
  2249. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  2250. slide( indexh - 1 );
  2251. }
  2252. }
  2253. // Normal navigation
  2254. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  2255. slide( indexh + 1 );
  2256. }
  2257. }
  2258. function navigateUp() {
  2259. // Prioritize hiding fragments
  2260. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  2261. slide( indexh, indexv - 1 );
  2262. }
  2263. }
  2264. function navigateDown() {
  2265. // Prioritize revealing fragments
  2266. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  2267. slide( indexh, indexv + 1 );
  2268. }
  2269. }
  2270. /**
  2271. * Navigates backwards, prioritized in the following order:
  2272. * 1) Previous fragment
  2273. * 2) Previous vertical slide
  2274. * 3) Previous horizontal slide
  2275. */
  2276. function navigatePrev() {
  2277. // Prioritize revealing fragments
  2278. if( previousFragment() === false ) {
  2279. if( availableRoutes().up ) {
  2280. navigateUp();
  2281. }
  2282. else {
  2283. // Fetch the previous horizontal slide, if there is one
  2284. var previousSlide = document.querySelector( HORIZONTAL_SLIDES_SELECTOR + '.past:nth-child(' + indexh + ')' );
  2285. if( previousSlide ) {
  2286. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  2287. var h = indexh - 1;
  2288. slide( h, v );
  2289. }
  2290. }
  2291. }
  2292. }
  2293. /**
  2294. * Same as #navigatePrev() but navigates forwards.
  2295. */
  2296. function navigateNext() {
  2297. // Prioritize revealing fragments
  2298. if( nextFragment() === false ) {
  2299. availableRoutes().down ? navigateDown() : navigateRight();
  2300. }
  2301. // If auto-sliding is enabled we need to cue up
  2302. // another timeout
  2303. cueAutoSlide();
  2304. }
  2305. // --------------------------------------------------------------------//
  2306. // ----------------------------- EVENTS -------------------------------//
  2307. // --------------------------------------------------------------------//
  2308. /**
  2309. * Called by all event handlers that are based on user
  2310. * input.
  2311. */
  2312. function onUserInput( event ) {
  2313. if( config.autoSlideStoppable ) {
  2314. pauseAutoSlide();
  2315. }
  2316. }
  2317. /**
  2318. * Handler for the document level 'keydown' event.
  2319. */
  2320. function onDocumentKeyDown( event ) {
  2321. // If there's a condition specified and it returns false,
  2322. // ignore this event
  2323. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
  2324. return true;
  2325. }
  2326. // Remember if auto-sliding was paused so we can toggle it
  2327. var autoSlideWasPaused = autoSlidePaused;
  2328. onUserInput( event );
  2329. // Check if there's a focused element that could be using
  2330. // the keyboard
  2331. var activeElement = document.activeElement;
  2332. var hasFocus = !!( document.activeElement && ( document.activeElement.type || document.activeElement.href || document.activeElement.contentEditable !== 'inherit' ) );
  2333. // Disregard the event if there's a focused element or a
  2334. // keyboard modifier key is present
  2335. if( hasFocus || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  2336. // While paused only allow "unpausing" keyboard events (b and .)
  2337. if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) {
  2338. return false;
  2339. }
  2340. var triggered = false;
  2341. // 1. User defined key bindings
  2342. if( typeof config.keyboard === 'object' ) {
  2343. for( var key in config.keyboard ) {
  2344. // Check if this binding matches the pressed key
  2345. if( parseInt( key, 10 ) === event.keyCode ) {
  2346. var value = config.keyboard[ key ];
  2347. // Callback function
  2348. if( typeof value === 'function' ) {
  2349. value.apply( null, [ event ] );
  2350. }
  2351. // String shortcuts to reveal.js API
  2352. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  2353. Reveal[ value ].call();
  2354. }
  2355. triggered = true;
  2356. }
  2357. }
  2358. }
  2359. // 2. System defined key bindings
  2360. if( triggered === false ) {
  2361. // Assume true and try to prove false
  2362. triggered = true;
  2363. switch( event.keyCode ) {
  2364. // p, page up
  2365. case 80: case 33: navigatePrev(); break;
  2366. // n, page down
  2367. case 78: case 34: navigateNext(); break;
  2368. // h, left
  2369. case 72: case 37: navigateLeft(); break;
  2370. // l, right
  2371. case 76: case 39: navigateRight(); break;
  2372. // k, up
  2373. case 75: case 38: navigateUp(); break;
  2374. // j, down
  2375. case 74: case 40: navigateDown(); break;
  2376. // home
  2377. case 36: slide( 0 ); break;
  2378. // end
  2379. case 35: slide( Number.MAX_VALUE ); break;
  2380. // space
  2381. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  2382. // return
  2383. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  2384. // two-spot, semicolon, b, period, Logitech presenter tools "black screen" button
  2385. case 58: case 59: case 66: case 190: case 191: togglePause(); break;
  2386. // f
  2387. case 70: enterFullscreen(); break;
  2388. // a
  2389. case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
  2390. default:
  2391. triggered = false;
  2392. }
  2393. }
  2394. // If the input resulted in a triggered action we should prevent
  2395. // the browsers default behavior
  2396. if( triggered ) {
  2397. event.preventDefault();
  2398. }
  2399. // ESC or O key
  2400. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  2401. if( dom.preview ) {
  2402. closePreview();
  2403. }
  2404. else {
  2405. toggleOverview();
  2406. }
  2407. event.preventDefault();
  2408. }
  2409. // If auto-sliding is enabled we need to cue up
  2410. // another timeout
  2411. cueAutoSlide();
  2412. }
  2413. /**
  2414. * Handler for the 'touchstart' event, enables support for
  2415. * swipe and pinch gestures.
  2416. */
  2417. function onTouchStart( event ) {
  2418. touch.startX = event.touches[0].clientX;
  2419. touch.startY = event.touches[0].clientY;
  2420. touch.startCount = event.touches.length;
  2421. // If there's two touches we need to memorize the distance
  2422. // between those two points to detect pinching
  2423. if( event.touches.length === 2 && config.overview ) {
  2424. touch.startSpan = distanceBetween( {
  2425. x: event.touches[1].clientX,
  2426. y: event.touches[1].clientY
  2427. }, {
  2428. x: touch.startX,
  2429. y: touch.startY
  2430. } );
  2431. }
  2432. }
  2433. /**
  2434. * Handler for the 'touchmove' event.
  2435. */
  2436. function onTouchMove( event ) {
  2437. // Each touch should only trigger one action
  2438. if( !touch.captured ) {
  2439. onUserInput( event );
  2440. var currentX = event.touches[0].clientX;
  2441. var currentY = event.touches[0].clientY;
  2442. // If the touch started with two points and still has
  2443. // two active touches; test for the pinch gesture
  2444. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  2445. // The current distance in pixels between the two touch points
  2446. var currentSpan = distanceBetween( {
  2447. x: event.touches[1].clientX,
  2448. y: event.touches[1].clientY
  2449. }, {
  2450. x: touch.startX,
  2451. y: touch.startY
  2452. } );
  2453. // If the span is larger than the desire amount we've got
  2454. // ourselves a pinch
  2455. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  2456. touch.captured = true;
  2457. if( currentSpan < touch.startSpan ) {
  2458. activateOverview();
  2459. }
  2460. else {
  2461. deactivateOverview();
  2462. }
  2463. }
  2464. event.preventDefault();
  2465. }
  2466. // There was only one touch point, look for a swipe
  2467. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  2468. var deltaX = currentX - touch.startX,
  2469. deltaY = currentY - touch.startY;
  2470. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2471. touch.captured = true;
  2472. navigateLeft();
  2473. }
  2474. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2475. touch.captured = true;
  2476. navigateRight();
  2477. }
  2478. else if( deltaY > touch.threshold ) {
  2479. touch.captured = true;
  2480. navigateUp();
  2481. }
  2482. else if( deltaY < -touch.threshold ) {
  2483. touch.captured = true;
  2484. navigateDown();
  2485. }
  2486. // If we're embedded, only block touch events if they have
  2487. // triggered an action
  2488. if( config.embedded ) {
  2489. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  2490. event.preventDefault();
  2491. }
  2492. }
  2493. // Not embedded? Block them all to avoid needless tossing
  2494. // around of the viewport in iOS
  2495. else {
  2496. event.preventDefault();
  2497. }
  2498. }
  2499. }
  2500. // There's a bug with swiping on some Android devices unless
  2501. // the default action is always prevented
  2502. else if( navigator.userAgent.match( /android/gi ) ) {
  2503. event.preventDefault();
  2504. }
  2505. }
  2506. /**
  2507. * Handler for the 'touchend' event.
  2508. */
  2509. function onTouchEnd( event ) {
  2510. touch.captured = false;
  2511. }
  2512. /**
  2513. * Convert pointer down to touch start.
  2514. */
  2515. function onPointerDown( event ) {
  2516. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2517. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2518. onTouchStart( event );
  2519. }
  2520. }
  2521. /**
  2522. * Convert pointer move to touch move.
  2523. */
  2524. function onPointerMove( event ) {
  2525. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2526. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2527. onTouchMove( event );
  2528. }
  2529. }
  2530. /**
  2531. * Convert pointer up to touch end.
  2532. */
  2533. function onPointerUp( event ) {
  2534. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  2535. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2536. onTouchEnd( event );
  2537. }
  2538. }
  2539. /**
  2540. * Handles mouse wheel scrolling, throttled to avoid skipping
  2541. * multiple slides.
  2542. */
  2543. function onDocumentMouseScroll( event ) {
  2544. if( Date.now() - lastMouseWheelStep > 600 ) {
  2545. lastMouseWheelStep = Date.now();
  2546. var delta = event.detail || -event.wheelDelta;
  2547. if( delta > 0 ) {
  2548. navigateNext();
  2549. }
  2550. else {
  2551. navigatePrev();
  2552. }
  2553. }
  2554. }
  2555. /**
  2556. * Clicking on the progress bar results in a navigation to the
  2557. * closest approximate horizontal slide using this equation:
  2558. *
  2559. * ( clickX / presentationWidth ) * numberOfSlides
  2560. */
  2561. function onProgressClicked( event ) {
  2562. onUserInput( event );
  2563. event.preventDefault();
  2564. var slidesTotal = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  2565. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  2566. slide( slideIndex );
  2567. }
  2568. /**
  2569. * Event handler for navigation control buttons.
  2570. */
  2571. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  2572. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  2573. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  2574. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  2575. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  2576. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  2577. /**
  2578. * Handler for the window level 'hashchange' event.
  2579. */
  2580. function onWindowHashChange( event ) {
  2581. readURL();
  2582. }
  2583. /**
  2584. * Handler for the window level 'resize' event.
  2585. */
  2586. function onWindowResize( event ) {
  2587. layout();
  2588. }
  2589. /**
  2590. * Handle for the window level 'visibilitychange' event.
  2591. */
  2592. function onPageVisibilityChange( event ) {
  2593. var isHidden = document.webkitHidden ||
  2594. document.msHidden ||
  2595. document.hidden;
  2596. // If, after clicking a link or similar and we're coming back,
  2597. // focus the document.body to ensure we can use keyboard shortcuts
  2598. if( isHidden === false && document.activeElement !== document.body ) {
  2599. document.activeElement.blur();
  2600. document.body.focus();
  2601. }
  2602. }
  2603. /**
  2604. * Invoked when a slide is and we're in the overview.
  2605. */
  2606. function onOverviewSlideClicked( event ) {
  2607. // TODO There's a bug here where the event listeners are not
  2608. // removed after deactivating the overview.
  2609. if( eventsAreBound && isOverview() ) {
  2610. event.preventDefault();
  2611. var element = event.target;
  2612. while( element && !element.nodeName.match( /section/gi ) ) {
  2613. element = element.parentNode;
  2614. }
  2615. if( element && !element.classList.contains( 'disabled' ) ) {
  2616. deactivateOverview();
  2617. if( element.nodeName.match( /section/gi ) ) {
  2618. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  2619. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  2620. slide( h, v );
  2621. }
  2622. }
  2623. }
  2624. }
  2625. /**
  2626. * Handles clicks on links that are set to preview in the
  2627. * iframe overlay.
  2628. */
  2629. function onPreviewLinkClicked( event ) {
  2630. var url = event.target.getAttribute( 'href' );
  2631. if( url ) {
  2632. openPreview( url );
  2633. event.preventDefault();
  2634. }
  2635. }
  2636. /**
  2637. * Handles click on the auto-sliding controls element.
  2638. */
  2639. function onAutoSlidePlayerClick( event ) {
  2640. // Replay
  2641. if( Reveal.isLastSlide() && config.loop === false ) {
  2642. slide( 0, 0 );
  2643. resumeAutoSlide();
  2644. }
  2645. // Resume
  2646. else if( autoSlidePaused ) {
  2647. resumeAutoSlide();
  2648. }
  2649. // Pause
  2650. else {
  2651. pauseAutoSlide();
  2652. }
  2653. }
  2654. // --------------------------------------------------------------------//
  2655. // ------------------------ PLAYBACK COMPONENT ------------------------//
  2656. // --------------------------------------------------------------------//
  2657. /**
  2658. * Constructor for the playback component, which displays
  2659. * play/pause/progress controls.
  2660. *
  2661. * @param {HTMLElement} container The component will append
  2662. * itself to this
  2663. * @param {Function} progressCheck A method which will be
  2664. * called frequently to get the current progress on a range
  2665. * of 0-1
  2666. */
  2667. function Playback( container, progressCheck ) {
  2668. // Cosmetics
  2669. this.diameter = 50;
  2670. this.thickness = 3;
  2671. // Flags if we are currently playing
  2672. this.playing = false;
  2673. // Current progress on a 0-1 range
  2674. this.progress = 0;
  2675. // Used to loop the animation smoothly
  2676. this.progressOffset = 1;
  2677. this.container = container;
  2678. this.progressCheck = progressCheck;
  2679. this.canvas = document.createElement( 'canvas' );
  2680. this.canvas.className = 'playback';
  2681. this.canvas.width = this.diameter;
  2682. this.canvas.height = this.diameter;
  2683. this.context = this.canvas.getContext( '2d' );
  2684. this.container.appendChild( this.canvas );
  2685. this.render();
  2686. }
  2687. Playback.prototype.setPlaying = function( value ) {
  2688. var wasPlaying = this.playing;
  2689. this.playing = value;
  2690. // Start repainting if we weren't already
  2691. if( !wasPlaying && this.playing ) {
  2692. this.animate();
  2693. }
  2694. else {
  2695. this.render();
  2696. }
  2697. };
  2698. Playback.prototype.animate = function() {
  2699. var progressBefore = this.progress;
  2700. this.progress = this.progressCheck();
  2701. // When we loop, offset the progress so that it eases
  2702. // smoothly rather than immediately resetting
  2703. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  2704. this.progressOffset = this.progress;
  2705. }
  2706. this.render();
  2707. if( this.playing ) {
  2708. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  2709. }
  2710. };
  2711. /**
  2712. * Renders the current progress and playback state.
  2713. */
  2714. Playback.prototype.render = function() {
  2715. var progress = this.playing ? this.progress : 0,
  2716. radius = ( this.diameter / 2 ) - this.thickness,
  2717. x = this.diameter / 2,
  2718. y = this.diameter / 2,
  2719. iconSize = 14;
  2720. // Ease towards 1
  2721. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  2722. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  2723. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  2724. this.context.save();
  2725. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  2726. // Solid background color
  2727. this.context.beginPath();
  2728. this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false );
  2729. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  2730. this.context.fill();
  2731. // Draw progress track
  2732. this.context.beginPath();
  2733. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  2734. this.context.lineWidth = this.thickness;
  2735. this.context.strokeStyle = '#666';
  2736. this.context.stroke();
  2737. if( this.playing ) {
  2738. // Draw progress on top of track
  2739. this.context.beginPath();
  2740. this.context.arc( x, y, radius, startAngle, endAngle, false );
  2741. this.context.lineWidth = this.thickness;
  2742. this.context.strokeStyle = '#fff';
  2743. this.context.stroke();
  2744. }
  2745. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  2746. // Draw play/pause icons
  2747. if( this.playing ) {
  2748. this.context.fillStyle = '#fff';
  2749. this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize );
  2750. this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize );
  2751. }
  2752. else {
  2753. this.context.beginPath();
  2754. this.context.translate( 2, 0 );
  2755. this.context.moveTo( 0, 0 );
  2756. this.context.lineTo( iconSize - 2, iconSize / 2 );
  2757. this.context.lineTo( 0, iconSize );
  2758. this.context.fillStyle = '#fff';
  2759. this.context.fill();
  2760. }
  2761. this.context.restore();
  2762. };
  2763. Playback.prototype.on = function( type, listener ) {
  2764. this.canvas.addEventListener( type, listener, false );
  2765. };
  2766. Playback.prototype.off = function( type, listener ) {
  2767. this.canvas.removeEventListener( type, listener, false );
  2768. };
  2769. Playback.prototype.destroy = function() {
  2770. this.playing = false;
  2771. if( this.canvas.parentNode ) {
  2772. this.container.removeChild( this.canvas );
  2773. }
  2774. };
  2775. // --------------------------------------------------------------------//
  2776. // ------------------------------- API --------------------------------//
  2777. // --------------------------------------------------------------------//
  2778. return {
  2779. initialize: initialize,
  2780. configure: configure,
  2781. sync: sync,
  2782. // Navigation methods
  2783. slide: slide,
  2784. left: navigateLeft,
  2785. right: navigateRight,
  2786. up: navigateUp,
  2787. down: navigateDown,
  2788. prev: navigatePrev,
  2789. next: navigateNext,
  2790. // Fragment methods
  2791. navigateFragment: navigateFragment,
  2792. prevFragment: previousFragment,
  2793. nextFragment: nextFragment,
  2794. // Deprecated aliases
  2795. navigateTo: slide,
  2796. navigateLeft: navigateLeft,
  2797. navigateRight: navigateRight,
  2798. navigateUp: navigateUp,
  2799. navigateDown: navigateDown,
  2800. navigatePrev: navigatePrev,
  2801. navigateNext: navigateNext,
  2802. // Forces an update in slide layout
  2803. layout: layout,
  2804. // Returns an object with the available routes as booleans (left/right/top/bottom)
  2805. availableRoutes: availableRoutes,
  2806. // Returns an object with the available fragments as booleans (prev/next)
  2807. availableFragments: availableFragments,
  2808. // Toggles the overview mode on/off
  2809. toggleOverview: toggleOverview,
  2810. // Toggles the "black screen" mode on/off
  2811. togglePause: togglePause,
  2812. // Toggles the auto slide mode on/off
  2813. toggleAutoSlide: toggleAutoSlide,
  2814. // State checks
  2815. isOverview: isOverview,
  2816. isPaused: isPaused,
  2817. isAutoSliding: isAutoSliding,
  2818. // Adds or removes all internal event listeners (such as keyboard)
  2819. addEventListeners: addEventListeners,
  2820. removeEventListeners: removeEventListeners,
  2821. // Facility for persisting and restoring the presentation state
  2822. getState: getState,
  2823. setState: setState,
  2824. // Presentation progress on range of 0-1
  2825. getProgress: getProgress,
  2826. // Returns the indices of the current, or specified, slide
  2827. getIndices: getIndices,
  2828. getTotalSlides: getTotalSlides,
  2829. // Returns the slide at the specified index, y is optional
  2830. getSlide: function( x, y ) {
  2831. var horizontalSlide = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2832. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2833. if( typeof y !== 'undefined' ) {
  2834. return verticalSlides ? verticalSlides[ y ] : undefined;
  2835. }
  2836. return horizontalSlide;
  2837. },
  2838. // Returns the previous slide element, may be null
  2839. getPreviousSlide: function() {
  2840. return previousSlide;
  2841. },
  2842. // Returns the current slide element
  2843. getCurrentSlide: function() {
  2844. return currentSlide;
  2845. },
  2846. // Returns the current scale of the presentation content
  2847. getScale: function() {
  2848. return scale;
  2849. },
  2850. // Returns the current configuration object
  2851. getConfig: function() {
  2852. return config;
  2853. },
  2854. // Helper method, retrieves query string as a key/value hash
  2855. getQueryHash: function() {
  2856. var query = {};
  2857. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  2858. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  2859. } );
  2860. // Basic deserialization
  2861. for( var i in query ) {
  2862. var value = query[ i ];
  2863. query[ i ] = deserialize( unescape( value ) );
  2864. }
  2865. return query;
  2866. },
  2867. // Returns true if we're currently on the first slide
  2868. isFirstSlide: function() {
  2869. return document.querySelector( SLIDES_SELECTOR + '.past' ) == null ? true : false;
  2870. },
  2871. // Returns true if we're currently on the last slide
  2872. isLastSlide: function() {
  2873. if( currentSlide ) {
  2874. // Does this slide has next a sibling?
  2875. if( currentSlide.nextElementSibling ) return false;
  2876. // If it's vertical, does its parent have a next sibling?
  2877. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  2878. return true;
  2879. }
  2880. return false;
  2881. },
  2882. // Checks if reveal.js has been loaded and is ready for use
  2883. isReady: function() {
  2884. return loaded;
  2885. },
  2886. // Forward event binding to the reveal DOM element
  2887. addEventListener: function( type, listener, useCapture ) {
  2888. if( 'addEventListener' in window ) {
  2889. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  2890. }
  2891. },
  2892. removeEventListener: function( type, listener, useCapture ) {
  2893. if( 'addEventListener' in window ) {
  2894. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  2895. }
  2896. }
  2897. };
  2898. })();