reveal.js 87 KB

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  1. /*!
  2. * reveal.js
  3. * http://lab.hakim.se/reveal-js
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2013 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. // Push each slide change to the browser history
  30. history: false,
  31. // Enable keyboard shortcuts for navigation
  32. keyboard: true,
  33. // Enable the slide overview mode
  34. overview: true,
  35. // Vertical centering of slides
  36. center: true,
  37. // Enables touch navigation on devices with touch input
  38. touch: true,
  39. // Loop the presentation
  40. loop: false,
  41. // Change the presentation direction to be RTL
  42. rtl: false,
  43. // Turns fragments on and off globally
  44. fragments: true,
  45. // Flags if the presentation is running in an embedded mode,
  46. // i.e. contained within a limited portion of the screen
  47. embedded: false,
  48. // Number of milliseconds between automatically proceeding to the
  49. // next slide, disabled when set to 0, this value can be overwritten
  50. // by using a data-autoslide attribute on your slides
  51. autoSlide: 0,
  52. // Stop auto-sliding after user input
  53. autoSlideStoppable: true,
  54. // Enable slide navigation via mouse wheel
  55. mouseWheel: false,
  56. // Apply a 3D roll to links on hover
  57. rollingLinks: false,
  58. // Hides the address bar on mobile devices
  59. hideAddressBar: true,
  60. // Opens links in an iframe preview overlay
  61. previewLinks: false,
  62. // Focuses body when page changes visiblity to ensure keyboard shortcuts work
  63. focusBodyOnPageVisiblityChange: true,
  64. // Theme (see /css/theme)
  65. theme: null,
  66. // Transition style
  67. transition: 'default', // default/cube/page/concave/zoom/linear/fade/none
  68. // Transition speed
  69. transitionSpeed: 'default', // default/fast/slow
  70. // Transition style for full page slide backgrounds
  71. backgroundTransition: 'default', // default/linear/none
  72. // Parallax background image
  73. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  74. // Parallax background size
  75. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  76. // Number of slides away from the current that are visible
  77. viewDistance: 3,
  78. // Script dependencies to load
  79. dependencies: [],
  80. // Indicates whether to show the slides number
  81. showSlideNumber: false
  82. },
  83. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  84. loaded = false,
  85. // The horizontal and vertical index of the currently active slide
  86. indexh,
  87. indexv,
  88. // The previous and current slide HTML elements
  89. previousSlide,
  90. currentSlide,
  91. previousBackground,
  92. // Slides may hold a data-state attribute which we pick up and apply
  93. // as a class to the body. This list contains the combined state of
  94. // all current slides.
  95. state = [],
  96. // The current scale of the presentation (see width/height config)
  97. scale = 1,
  98. // Cached references to DOM elements
  99. dom = {},
  100. // Features supported by the browser, see #checkCapabilities()
  101. features = {},
  102. // Client is a mobile device, see #checkCapabilities()
  103. isMobileDevice,
  104. // Throttles mouse wheel navigation
  105. lastMouseWheelStep = 0,
  106. // Delays updates to the URL due to a Chrome thumbnailer bug
  107. writeURLTimeout = 0,
  108. // A delay used to activate the overview mode
  109. activateOverviewTimeout = 0,
  110. // A delay used to deactivate the overview mode
  111. deactivateOverviewTimeout = 0,
  112. // Flags if the interaction event listeners are bound
  113. eventsAreBound = false,
  114. // The current auto-slide duration
  115. autoSlide = 0,
  116. // Auto slide properties
  117. autoSlidePlayer,
  118. autoSlideTimeout = 0,
  119. autoSlideStartTime = -1,
  120. autoSlidePaused = false,
  121. // Holds information about the currently ongoing touch input
  122. touch = {
  123. startX: 0,
  124. startY: 0,
  125. startSpan: 0,
  126. startCount: 0,
  127. captured: false,
  128. threshold: 40
  129. };
  130. /**
  131. * Starts up the presentation if the client is capable.
  132. */
  133. function initialize( options ) {
  134. checkCapabilities();
  135. if( !features.transforms2d && !features.transforms3d ) {
  136. document.body.setAttribute( 'class', 'no-transforms' );
  137. // If the browser doesn't support core features we won't be
  138. // using JavaScript to control the presentation
  139. return;
  140. }
  141. // Force a layout when the whole page, incl fonts, has loaded
  142. window.addEventListener( 'load', layout, false );
  143. var query = Reveal.getQueryHash();
  144. // Do not accept new dependencies via query config to avoid
  145. // the potential of malicious script injection
  146. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  147. // Copy options over to our config object
  148. extend( config, options );
  149. extend( config, query );
  150. // Hide the address bar in mobile browsers
  151. hideAddressBar();
  152. // Loads the dependencies and continues to #start() once done
  153. load();
  154. }
  155. /**
  156. * Inspect the client to see what it's capable of, this
  157. * should only happens once per runtime.
  158. */
  159. function checkCapabilities() {
  160. features.transforms3d = 'WebkitPerspective' in document.body.style ||
  161. 'MozPerspective' in document.body.style ||
  162. 'msPerspective' in document.body.style ||
  163. 'OPerspective' in document.body.style ||
  164. 'perspective' in document.body.style;
  165. features.transforms2d = 'WebkitTransform' in document.body.style ||
  166. 'MozTransform' in document.body.style ||
  167. 'msTransform' in document.body.style ||
  168. 'OTransform' in document.body.style ||
  169. 'transform' in document.body.style;
  170. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  171. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  172. features.canvas = !!document.createElement( 'canvas' ).getContext;
  173. isMobileDevice = navigator.userAgent.match( /(iphone|ipod|android)/gi );
  174. }
  175. /**
  176. * Loads the dependencies of reveal.js. Dependencies are
  177. * defined via the configuration option 'dependencies'
  178. * and will be loaded prior to starting/binding reveal.js.
  179. * Some dependencies may have an 'async' flag, if so they
  180. * will load after reveal.js has been started up.
  181. */
  182. function load() {
  183. var scripts = [],
  184. scriptsAsync = [];
  185. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  186. var s = config.dependencies[i];
  187. // Load if there's no condition or the condition is truthy
  188. if( !s.condition || s.condition() ) {
  189. if( s.async ) {
  190. scriptsAsync.push( s.src );
  191. }
  192. else {
  193. scripts.push( s.src );
  194. }
  195. // Extension may contain callback functions
  196. if( typeof s.callback === 'function' ) {
  197. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], s.callback );
  198. }
  199. }
  200. }
  201. // Called once synchronous scripts finish loading
  202. function proceed() {
  203. if( scriptsAsync.length ) {
  204. // Load asynchronous scripts
  205. head.js.apply( null, scriptsAsync );
  206. }
  207. start();
  208. }
  209. if( scripts.length ) {
  210. head.ready( proceed );
  211. // Load synchronous scripts
  212. head.js.apply( null, scripts );
  213. }
  214. else {
  215. proceed();
  216. }
  217. }
  218. /**
  219. * Starts up reveal.js by binding input events and navigating
  220. * to the current URL deeplink if there is one.
  221. */
  222. function start() {
  223. // Make sure we've got all the DOM elements we need
  224. setupDOM();
  225. // Decorate the slide DOM elements with state classes (past/future)
  226. setupSlides();
  227. // Updates the presentation to match the current configuration values
  228. configure();
  229. // Read the initial hash
  230. readURL();
  231. // Update all backgrounds
  232. updateBackground( true );
  233. // Notify listeners that the presentation is ready but use a 1ms
  234. // timeout to ensure it's not fired synchronously after #initialize()
  235. setTimeout( function() {
  236. // Enable transitions now that we're loaded
  237. dom.slides.classList.remove( 'no-transition' );
  238. loaded = true;
  239. dispatchEvent( 'ready', {
  240. 'indexh': indexh,
  241. 'indexv': indexv,
  242. 'currentSlide': currentSlide
  243. } );
  244. }, 1 );
  245. }
  246. /**
  247. * Iterates through and decorates slides DOM elements with
  248. * appropriate classes.
  249. */
  250. function setupSlides() {
  251. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  252. horizontalSlides.forEach( function( horizontalSlide ) {
  253. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  254. verticalSlides.forEach( function( verticalSlide, y ) {
  255. if( y > 0 ) verticalSlide.classList.add( 'future' );
  256. } );
  257. } );
  258. }
  259. /**
  260. * Finds and stores references to DOM elements which are
  261. * required by the presentation. If a required element is
  262. * not found, it is created.
  263. */
  264. function setupDOM() {
  265. // Cache references to key DOM elements
  266. dom.theme = document.querySelector( '#theme' );
  267. dom.wrapper = document.querySelector( '.reveal' );
  268. dom.slides = document.querySelector( '.reveal .slides' );
  269. // Prevent transitions while we're loading
  270. dom.slides.classList.add( 'no-transition' );
  271. // Background element
  272. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  273. // Progress bar
  274. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  275. dom.progressbar = dom.progress.querySelector( 'span' );
  276. // Arrow controls
  277. createSingletonNode( dom.wrapper, 'aside', 'controls',
  278. '<div class="navigate-left"></div>' +
  279. '<div class="navigate-right"></div>' +
  280. '<div class="navigate-up"></div>' +
  281. '<div class="navigate-down"></div>' );
  282. // slide number
  283. createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  284. // State background element [DEPRECATED]
  285. createSingletonNode( dom.wrapper, 'div', 'state-background', null );
  286. // Overlay graphic which is displayed during the paused mode
  287. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  288. // Cache references to elements
  289. dom.controls = document.querySelector( '.reveal .controls' );
  290. // There can be multiple instances of controls throughout the page
  291. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  292. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  293. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  294. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  295. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  296. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  297. dom.slideNumber = document.querySelector( '.slide-number' );
  298. }
  299. /**
  300. * Creates an HTML element and returns a reference to it.
  301. * If the element already exists the existing instance will
  302. * be returned.
  303. */
  304. function createSingletonNode( container, tagname, classname, innerHTML ) {
  305. var node = container.querySelector( '.' + classname );
  306. if( !node ) {
  307. node = document.createElement( tagname );
  308. node.classList.add( classname );
  309. if( innerHTML !== null ) {
  310. node.innerHTML = innerHTML;
  311. }
  312. container.appendChild( node );
  313. }
  314. return node;
  315. }
  316. /**
  317. * Creates the slide background elements and appends them
  318. * to the background container. One element is created per
  319. * slide no matter if the given slide has visible background.
  320. */
  321. function createBackgrounds() {
  322. if( isPrintingPDF() ) {
  323. document.body.classList.add( 'print-pdf' );
  324. }
  325. // Clear prior backgrounds
  326. dom.background.innerHTML = '';
  327. dom.background.classList.add( 'no-transition' );
  328. // Helper method for creating a background element for the
  329. // given slide
  330. function _createBackground( slide, container ) {
  331. var data = {
  332. background: slide.getAttribute( 'data-background' ),
  333. backgroundSize: slide.getAttribute( 'data-background-size' ),
  334. backgroundImage: slide.getAttribute( 'data-background-image' ),
  335. backgroundColor: slide.getAttribute( 'data-background-color' ),
  336. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  337. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  338. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  339. };
  340. var element = document.createElement( 'div' );
  341. element.className = 'slide-background';
  342. if( data.background ) {
  343. // Auto-wrap image urls in url(...)
  344. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
  345. element.style.backgroundImage = 'url('+ data.background +')';
  346. }
  347. else {
  348. element.style.background = data.background;
  349. }
  350. }
  351. if( data.background || data.backgroundColor || data.backgroundImage ) {
  352. element.setAttribute( 'data-background-hash', data.background + data.backgroundSize + data.backgroundImage + data.backgroundColor + data.backgroundRepeat + data.backgroundPosition + data.backgroundTransition );
  353. }
  354. // Additional and optional background properties
  355. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  356. if( data.backgroundImage ) element.style.backgroundImage = 'url("' + data.backgroundImage + '")';
  357. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  358. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  359. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  360. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  361. container.appendChild( element );
  362. return element;
  363. }
  364. // Iterate over all horizontal slides
  365. toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  366. var backgroundStack;
  367. if( isPrintingPDF() ) {
  368. backgroundStack = _createBackground( slideh, slideh );
  369. }
  370. else {
  371. backgroundStack = _createBackground( slideh, dom.background );
  372. }
  373. // Iterate over all vertical slides
  374. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  375. if( isPrintingPDF() ) {
  376. _createBackground( slidev, slidev );
  377. }
  378. else {
  379. _createBackground( slidev, backgroundStack );
  380. }
  381. } );
  382. } );
  383. // Add parallax background if specified
  384. if( config.parallaxBackgroundImage ) {
  385. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  386. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  387. // Make sure the below properties are set on the element - these properties are
  388. // needed for proper transitions to be set on the element via CSS. To remove
  389. // annoying background slide-in effect when the presentation starts, apply
  390. // these properties after short time delay
  391. setTimeout( function() {
  392. dom.wrapper.classList.add( 'has-parallax-background' );
  393. }, 1 );
  394. }
  395. else {
  396. dom.background.style.backgroundImage = '';
  397. dom.wrapper.classList.remove( 'has-parallax-background' );
  398. }
  399. }
  400. /**
  401. * Applies the configuration settings from the config
  402. * object. May be called multiple times.
  403. */
  404. function configure( options ) {
  405. var numberOfSlides = document.querySelectorAll( SLIDES_SELECTOR ).length;
  406. dom.wrapper.classList.remove( config.transition );
  407. // New config options may be passed when this method
  408. // is invoked through the API after initialization
  409. if( typeof options === 'object' ) extend( config, options );
  410. // Force linear transition based on browser capabilities
  411. if( features.transforms3d === false ) config.transition = 'linear';
  412. dom.wrapper.classList.add( config.transition );
  413. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  414. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  415. dom.controls.style.display = config.controls ? 'block' : 'none';
  416. dom.progress.style.display = config.progress ? 'block' : 'none';
  417. if( config.rtl ) {
  418. dom.wrapper.classList.add( 'rtl' );
  419. }
  420. else {
  421. dom.wrapper.classList.remove( 'rtl' );
  422. }
  423. if( config.center ) {
  424. dom.wrapper.classList.add( 'center' );
  425. }
  426. else {
  427. dom.wrapper.classList.remove( 'center' );
  428. }
  429. if( config.mouseWheel ) {
  430. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  431. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  432. }
  433. else {
  434. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  435. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  436. }
  437. // Rolling 3D links
  438. if( config.rollingLinks ) {
  439. enableRollingLinks();
  440. }
  441. else {
  442. disableRollingLinks();
  443. }
  444. // Iframe link previews
  445. if( config.previewLinks ) {
  446. enablePreviewLinks();
  447. }
  448. else {
  449. disablePreviewLinks();
  450. enablePreviewLinks( '[data-preview-link]' );
  451. }
  452. // Auto-slide playback controls
  453. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  454. autoSlidePlayer = new Playback( dom.wrapper, function() {
  455. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  456. } );
  457. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  458. autoSlidePaused = false;
  459. }
  460. else if( autoSlidePlayer ) {
  461. autoSlidePlayer.destroy();
  462. autoSlidePlayer = null;
  463. }
  464. // Load the theme in the config, if it's not already loaded
  465. if( config.theme && dom.theme ) {
  466. var themeURL = dom.theme.getAttribute( 'href' );
  467. var themeFinder = /[^\/]*?(?=\.css)/;
  468. var themeName = themeURL.match(themeFinder)[0];
  469. if( config.theme !== themeName ) {
  470. themeURL = themeURL.replace(themeFinder, config.theme);
  471. dom.theme.setAttribute( 'href', themeURL );
  472. }
  473. }
  474. sync();
  475. }
  476. /**
  477. * Binds all event listeners.
  478. */
  479. function addEventListeners() {
  480. eventsAreBound = true;
  481. window.addEventListener( 'hashchange', onWindowHashChange, false );
  482. window.addEventListener( 'resize', onWindowResize, false );
  483. if( config.touch ) {
  484. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  485. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  486. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  487. // Support pointer-style touch interaction as well
  488. if( window.navigator.msPointerEnabled ) {
  489. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  490. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  491. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  492. }
  493. }
  494. if( config.keyboard ) {
  495. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  496. }
  497. if( config.progress && dom.progress ) {
  498. dom.progress.addEventListener( 'click', onProgressClicked, false );
  499. }
  500. if( config.focusBodyOnPageVisiblityChange ) {
  501. var visibilityChange;
  502. if( 'hidden' in document ) {
  503. visibilityChange = 'visibilitychange';
  504. }
  505. else if( 'msHidden' in document ) {
  506. visibilityChange = 'msvisibilitychange';
  507. }
  508. else if( 'webkitHidden' in document ) {
  509. visibilityChange = 'webkitvisibilitychange';
  510. }
  511. if( visibilityChange ) {
  512. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  513. }
  514. }
  515. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  516. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  517. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  518. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  519. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  520. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  521. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  522. } );
  523. }
  524. /**
  525. * Unbinds all event listeners.
  526. */
  527. function removeEventListeners() {
  528. eventsAreBound = false;
  529. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  530. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  531. window.removeEventListener( 'resize', onWindowResize, false );
  532. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  533. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  534. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  535. if( window.navigator.msPointerEnabled ) {
  536. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  537. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  538. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  539. }
  540. if ( config.progress && dom.progress ) {
  541. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  542. }
  543. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  544. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  545. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  546. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  547. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  548. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  549. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  550. } );
  551. }
  552. /**
  553. * Extend object a with the properties of object b.
  554. * If there's a conflict, object b takes precedence.
  555. */
  556. function extend( a, b ) {
  557. for( var i in b ) {
  558. a[ i ] = b[ i ];
  559. }
  560. }
  561. /**
  562. * Converts the target object to an array.
  563. */
  564. function toArray( o ) {
  565. return Array.prototype.slice.call( o );
  566. }
  567. /**
  568. * Measures the distance in pixels between point a
  569. * and point b.
  570. *
  571. * @param {Object} a point with x/y properties
  572. * @param {Object} b point with x/y properties
  573. */
  574. function distanceBetween( a, b ) {
  575. var dx = a.x - b.x,
  576. dy = a.y - b.y;
  577. return Math.sqrt( dx*dx + dy*dy );
  578. }
  579. /**
  580. * Applies a CSS transform to the target element.
  581. */
  582. function transformElement( element, transform ) {
  583. element.style.WebkitTransform = transform;
  584. element.style.MozTransform = transform;
  585. element.style.msTransform = transform;
  586. element.style.OTransform = transform;
  587. element.style.transform = transform;
  588. }
  589. /**
  590. * Retrieves the height of the given element by looking
  591. * at the position and height of its immediate children.
  592. */
  593. function getAbsoluteHeight( element ) {
  594. var height = 0;
  595. if( element ) {
  596. var absoluteChildren = 0;
  597. toArray( element.childNodes ).forEach( function( child ) {
  598. if( typeof child.offsetTop === 'number' && child.style ) {
  599. // Count # of abs children
  600. if( child.style.position === 'absolute' ) {
  601. absoluteChildren += 1;
  602. }
  603. height = Math.max( height, child.offsetTop + child.offsetHeight );
  604. }
  605. } );
  606. // If there are no absolute children, use offsetHeight
  607. if( absoluteChildren === 0 ) {
  608. height = element.offsetHeight;
  609. }
  610. }
  611. return height;
  612. }
  613. /**
  614. * Returns the remaining height within the parent of the
  615. * target element after subtracting the height of all
  616. * siblings.
  617. *
  618. * remaining height = [parent height] - [ siblings height]
  619. */
  620. function getRemainingHeight( element, height ) {
  621. height = height || 0;
  622. if( element ) {
  623. var parent = element.parentNode;
  624. var siblings = parent.childNodes;
  625. // Subtract the height of each sibling
  626. toArray( siblings ).forEach( function( sibling ) {
  627. if( typeof sibling.offsetHeight === 'number' && sibling !== element ) {
  628. var styles = window.getComputedStyle( sibling ),
  629. marginTop = parseInt( styles.marginTop, 10 ),
  630. marginBottom = parseInt( styles.marginBottom, 10 );
  631. height -= sibling.offsetHeight + marginTop + marginBottom;
  632. }
  633. } );
  634. var elementStyles = window.getComputedStyle( element );
  635. // Subtract the margins of the target element
  636. height -= parseInt( elementStyles.marginTop, 10 ) +
  637. parseInt( elementStyles.marginBottom, 10 );
  638. }
  639. return height;
  640. }
  641. /**
  642. * Checks if this instance is being used to print a PDF.
  643. */
  644. function isPrintingPDF() {
  645. return ( /print-pdf/gi ).test( window.location.search );
  646. }
  647. /**
  648. * Hides the address bar if we're on a mobile device.
  649. */
  650. function hideAddressBar() {
  651. if( config.hideAddressBar && isMobileDevice ) {
  652. // Events that should trigger the address bar to hide
  653. window.addEventListener( 'load', removeAddressBar, false );
  654. window.addEventListener( 'orientationchange', removeAddressBar, false );
  655. }
  656. }
  657. /**
  658. * Causes the address bar to hide on mobile devices,
  659. * more vertical space ftw.
  660. */
  661. function removeAddressBar() {
  662. setTimeout( function() {
  663. window.scrollTo( 0, 1 );
  664. }, 10 );
  665. }
  666. /**
  667. * Dispatches an event of the specified type from the
  668. * reveal DOM element.
  669. */
  670. function dispatchEvent( type, properties ) {
  671. var event = document.createEvent( "HTMLEvents", 1, 2 );
  672. event.initEvent( type, true, true );
  673. extend( event, properties );
  674. dom.wrapper.dispatchEvent( event );
  675. }
  676. /**
  677. * Wrap all links in 3D goodness.
  678. */
  679. function enableRollingLinks() {
  680. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  681. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a:not(.image)' );
  682. for( var i = 0, len = anchors.length; i < len; i++ ) {
  683. var anchor = anchors[i];
  684. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  685. var span = document.createElement('span');
  686. span.setAttribute('data-title', anchor.text);
  687. span.innerHTML = anchor.innerHTML;
  688. anchor.classList.add( 'roll' );
  689. anchor.innerHTML = '';
  690. anchor.appendChild(span);
  691. }
  692. }
  693. }
  694. }
  695. /**
  696. * Unwrap all 3D links.
  697. */
  698. function disableRollingLinks() {
  699. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  700. for( var i = 0, len = anchors.length; i < len; i++ ) {
  701. var anchor = anchors[i];
  702. var span = anchor.querySelector( 'span' );
  703. if( span ) {
  704. anchor.classList.remove( 'roll' );
  705. anchor.innerHTML = span.innerHTML;
  706. }
  707. }
  708. }
  709. /**
  710. * Bind preview frame links.
  711. */
  712. function enablePreviewLinks( selector ) {
  713. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  714. anchors.forEach( function( element ) {
  715. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  716. element.addEventListener( 'click', onPreviewLinkClicked, false );
  717. }
  718. } );
  719. }
  720. /**
  721. * Unbind preview frame links.
  722. */
  723. function disablePreviewLinks() {
  724. var anchors = toArray( document.querySelectorAll( 'a' ) );
  725. anchors.forEach( function( element ) {
  726. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  727. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  728. }
  729. } );
  730. }
  731. /**
  732. * Opens a preview window for the target URL.
  733. */
  734. function openPreview( url ) {
  735. closePreview();
  736. dom.preview = document.createElement( 'div' );
  737. dom.preview.classList.add( 'preview-link-overlay' );
  738. dom.wrapper.appendChild( dom.preview );
  739. dom.preview.innerHTML = [
  740. '<header>',
  741. '<a class="close" href="#"><span class="icon"></span></a>',
  742. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  743. '</header>',
  744. '<div class="spinner"></div>',
  745. '<div class="viewport">',
  746. '<iframe src="'+ url +'"></iframe>',
  747. '</div>'
  748. ].join('');
  749. dom.preview.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  750. dom.preview.classList.add( 'loaded' );
  751. }, false );
  752. dom.preview.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  753. closePreview();
  754. event.preventDefault();
  755. }, false );
  756. dom.preview.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  757. closePreview();
  758. }, false );
  759. setTimeout( function() {
  760. dom.preview.classList.add( 'visible' );
  761. }, 1 );
  762. }
  763. /**
  764. * Closes the iframe preview window.
  765. */
  766. function closePreview() {
  767. if( dom.preview ) {
  768. dom.preview.setAttribute( 'src', '' );
  769. dom.preview.parentNode.removeChild( dom.preview );
  770. dom.preview = null;
  771. }
  772. }
  773. /**
  774. * Return a sorted fragments list, ordered by an increasing
  775. * "data-fragment-index" attribute.
  776. *
  777. * Fragments will be revealed in the order that they are returned by
  778. * this function, so you can use the index attributes to control the
  779. * order of fragment appearance.
  780. *
  781. * To maintain a sensible default fragment order, fragments are presumed
  782. * to be passed in document order. This function adds a "fragment-index"
  783. * attribute to each node if such an attribute is not already present,
  784. * and sets that attribute to an integer value which is the position of
  785. * the fragment within the fragments list.
  786. */
  787. function sortFragments( fragments ) {
  788. var a = toArray( fragments );
  789. a.forEach( function( el, idx ) {
  790. if( !el.hasAttribute( 'data-fragment-index' ) ) {
  791. el.setAttribute( 'data-fragment-index', idx );
  792. }
  793. } );
  794. a.sort( function( l, r ) {
  795. return l.getAttribute( 'data-fragment-index' ) - r.getAttribute( 'data-fragment-index');
  796. } );
  797. return a;
  798. }
  799. /**
  800. * Applies JavaScript-controlled layout rules to the
  801. * presentation.
  802. */
  803. function layout() {
  804. if( dom.wrapper && !isPrintingPDF() ) {
  805. // Available space to scale within
  806. var availableWidth = dom.wrapper.offsetWidth,
  807. availableHeight = dom.wrapper.offsetHeight;
  808. // Reduce available space by margin
  809. availableWidth -= ( availableHeight * config.margin );
  810. availableHeight -= ( availableHeight * config.margin );
  811. // Dimensions of the content
  812. var slideWidth = config.width,
  813. slideHeight = config.height,
  814. slidePadding = 20; // TODO Dig this out of DOM
  815. // Layout the contents of the slides
  816. layoutSlideContents( config.width, config.height, slidePadding );
  817. // Slide width may be a percentage of available width
  818. if( typeof slideWidth === 'string' && /%$/.test( slideWidth ) ) {
  819. slideWidth = parseInt( slideWidth, 10 ) / 100 * availableWidth;
  820. }
  821. // Slide height may be a percentage of available height
  822. if( typeof slideHeight === 'string' && /%$/.test( slideHeight ) ) {
  823. slideHeight = parseInt( slideHeight, 10 ) / 100 * availableHeight;
  824. }
  825. dom.slides.style.width = slideWidth + 'px';
  826. dom.slides.style.height = slideHeight + 'px';
  827. // Determine scale of content to fit within available space
  828. scale = Math.min( availableWidth / slideWidth, availableHeight / slideHeight );
  829. // Respect max/min scale settings
  830. scale = Math.max( scale, config.minScale );
  831. scale = Math.min( scale, config.maxScale );
  832. // Prefer applying scale via zoom since Chrome blurs scaled content
  833. // with nested transforms
  834. if( typeof dom.slides.style.zoom !== 'undefined' && !navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi ) ) {
  835. dom.slides.style.zoom = scale;
  836. }
  837. // Apply scale transform as a fallback
  838. else {
  839. transformElement( dom.slides, 'translate(-50%, -50%) scale('+ scale +') translate(50%, 50%)' );
  840. }
  841. // Select all slides, vertical and horizontal
  842. var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
  843. for( var i = 0, len = slides.length; i < len; i++ ) {
  844. var slide = slides[ i ];
  845. // Don't bother updating invisible slides
  846. if( slide.style.display === 'none' ) {
  847. continue;
  848. }
  849. if( config.center || slide.classList.contains( 'center' ) ) {
  850. // Vertical stacks are not centred since their section
  851. // children will be
  852. if( slide.classList.contains( 'stack' ) ) {
  853. slide.style.top = 0;
  854. }
  855. else {
  856. slide.style.top = Math.max( - ( getAbsoluteHeight( slide ) / 2 ) - slidePadding, -slideHeight / 2 ) + 'px';
  857. }
  858. }
  859. else {
  860. slide.style.top = '';
  861. }
  862. }
  863. updateProgress();
  864. updateParallax();
  865. }
  866. }
  867. /**
  868. * Applies layout logic to the contents of all slides in
  869. * the presentation.
  870. */
  871. function layoutSlideContents( width, height, padding ) {
  872. // Handle sizing of elements with the 'stretch' class
  873. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  874. // Determine how much vertical space we can use
  875. var remainingHeight = getRemainingHeight( element, ( height - ( padding * 2 ) ) );
  876. // Consider the aspect ratio of media elements
  877. if( /(img|video)/gi.test( element.nodeName ) ) {
  878. var nw = element.naturalWidth || element.videoWidth,
  879. nh = element.naturalHeight || element.videoHeight;
  880. var es = Math.min( width / nw, remainingHeight / nh );
  881. element.style.width = ( nw * es ) + 'px';
  882. element.style.height = ( nh * es ) + 'px';
  883. }
  884. else {
  885. element.style.width = width + 'px';
  886. element.style.height = remainingHeight + 'px';
  887. }
  888. } );
  889. }
  890. /**
  891. * Stores the vertical index of a stack so that the same
  892. * vertical slide can be selected when navigating to and
  893. * from the stack.
  894. *
  895. * @param {HTMLElement} stack The vertical stack element
  896. * @param {int} v Index to memorize
  897. */
  898. function setPreviousVerticalIndex( stack, v ) {
  899. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  900. stack.setAttribute( 'data-previous-indexv', v || 0 );
  901. }
  902. }
  903. /**
  904. * Retrieves the vertical index which was stored using
  905. * #setPreviousVerticalIndex() or 0 if no previous index
  906. * exists.
  907. *
  908. * @param {HTMLElement} stack The vertical stack element
  909. */
  910. function getPreviousVerticalIndex( stack ) {
  911. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  912. // Prefer manually defined start-indexv
  913. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  914. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  915. }
  916. return 0;
  917. }
  918. /**
  919. * Displays the overview of slides (quick nav) by
  920. * scaling down and arranging all slide elements.
  921. *
  922. * Experimental feature, might be dropped if perf
  923. * can't be improved.
  924. */
  925. function activateOverview() {
  926. // Only proceed if enabled in config
  927. if( config.overview ) {
  928. // Don't auto-slide while in overview mode
  929. cancelAutoSlide();
  930. var wasActive = dom.wrapper.classList.contains( 'overview' );
  931. // Vary the depth of the overview based on screen size
  932. var depth = window.innerWidth < 400 ? 1000 : 2500;
  933. dom.wrapper.classList.add( 'overview' );
  934. dom.wrapper.classList.remove( 'overview-deactivating' );
  935. clearTimeout( activateOverviewTimeout );
  936. clearTimeout( deactivateOverviewTimeout );
  937. // Not the pretties solution, but need to let the overview
  938. // class apply first so that slides are measured accurately
  939. // before we can position them
  940. activateOverviewTimeout = setTimeout( function() {
  941. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  942. for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
  943. var hslide = horizontalSlides[i],
  944. hoffset = config.rtl ? -105 : 105;
  945. hslide.setAttribute( 'data-index-h', i );
  946. // Apply CSS transform
  947. transformElement( hslide, 'translateZ(-'+ depth +'px) translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)' );
  948. if( hslide.classList.contains( 'stack' ) ) {
  949. var verticalSlides = hslide.querySelectorAll( 'section' );
  950. for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
  951. var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );
  952. var vslide = verticalSlides[j];
  953. vslide.setAttribute( 'data-index-h', i );
  954. vslide.setAttribute( 'data-index-v', j );
  955. // Apply CSS transform
  956. transformElement( vslide, 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)' );
  957. // Navigate to this slide on click
  958. vslide.addEventListener( 'click', onOverviewSlideClicked, true );
  959. }
  960. }
  961. else {
  962. // Navigate to this slide on click
  963. hslide.addEventListener( 'click', onOverviewSlideClicked, true );
  964. }
  965. }
  966. updateSlidesVisibility();
  967. layout();
  968. if( !wasActive ) {
  969. // Notify observers of the overview showing
  970. dispatchEvent( 'overviewshown', {
  971. 'indexh': indexh,
  972. 'indexv': indexv,
  973. 'currentSlide': currentSlide
  974. } );
  975. }
  976. }, 10 );
  977. }
  978. }
  979. /**
  980. * Exits the slide overview and enters the currently
  981. * active slide.
  982. */
  983. function deactivateOverview() {
  984. // Only proceed if enabled in config
  985. if( config.overview ) {
  986. clearTimeout( activateOverviewTimeout );
  987. clearTimeout( deactivateOverviewTimeout );
  988. dom.wrapper.classList.remove( 'overview' );
  989. // Temporarily add a class so that transitions can do different things
  990. // depending on whether they are exiting/entering overview, or just
  991. // moving from slide to slide
  992. dom.wrapper.classList.add( 'overview-deactivating' );
  993. deactivateOverviewTimeout = setTimeout( function () {
  994. dom.wrapper.classList.remove( 'overview-deactivating' );
  995. }, 1 );
  996. // Select all slides
  997. toArray( document.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  998. // Resets all transforms to use the external styles
  999. transformElement( slide, '' );
  1000. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1001. } );
  1002. slide( indexh, indexv );
  1003. cueAutoSlide();
  1004. // Notify observers of the overview hiding
  1005. dispatchEvent( 'overviewhidden', {
  1006. 'indexh': indexh,
  1007. 'indexv': indexv,
  1008. 'currentSlide': currentSlide
  1009. } );
  1010. }
  1011. }
  1012. /**
  1013. * Toggles the slide overview mode on and off.
  1014. *
  1015. * @param {Boolean} override Optional flag which overrides the
  1016. * toggle logic and forcibly sets the desired state. True means
  1017. * overview is open, false means it's closed.
  1018. */
  1019. function toggleOverview( override ) {
  1020. if( typeof override === 'boolean' ) {
  1021. override ? activateOverview() : deactivateOverview();
  1022. }
  1023. else {
  1024. isOverview() ? deactivateOverview() : activateOverview();
  1025. }
  1026. }
  1027. /**
  1028. * Checks if the overview is currently active.
  1029. *
  1030. * @return {Boolean} true if the overview is active,
  1031. * false otherwise
  1032. */
  1033. function isOverview() {
  1034. return dom.wrapper.classList.contains( 'overview' );
  1035. }
  1036. /**
  1037. * Checks if the current or specified slide is vertical
  1038. * (nested within another slide).
  1039. *
  1040. * @param {HTMLElement} slide [optional] The slide to check
  1041. * orientation of
  1042. */
  1043. function isVerticalSlide( slide ) {
  1044. // Prefer slide argument, otherwise use current slide
  1045. slide = slide ? slide : currentSlide;
  1046. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1047. }
  1048. /**
  1049. * Handling the fullscreen functionality via the fullscreen API
  1050. *
  1051. * @see http://fullscreen.spec.whatwg.org/
  1052. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1053. */
  1054. function enterFullscreen() {
  1055. var element = document.body;
  1056. // Check which implementation is available
  1057. var requestMethod = element.requestFullScreen ||
  1058. element.webkitRequestFullscreen ||
  1059. element.webkitRequestFullScreen ||
  1060. element.mozRequestFullScreen ||
  1061. element.msRequestFullScreen;
  1062. if( requestMethod ) {
  1063. requestMethod.apply( element );
  1064. }
  1065. }
  1066. /**
  1067. * Enters the paused mode which fades everything on screen to
  1068. * black.
  1069. */
  1070. function pause() {
  1071. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1072. cancelAutoSlide();
  1073. dom.wrapper.classList.add( 'paused' );
  1074. if( wasPaused === false ) {
  1075. dispatchEvent( 'paused' );
  1076. }
  1077. }
  1078. /**
  1079. * Exits from the paused mode.
  1080. */
  1081. function resume() {
  1082. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1083. dom.wrapper.classList.remove( 'paused' );
  1084. cueAutoSlide();
  1085. if( wasPaused ) {
  1086. dispatchEvent( 'resumed' );
  1087. }
  1088. }
  1089. /**
  1090. * Toggles the paused mode on and off.
  1091. */
  1092. function togglePause() {
  1093. if( isPaused() ) {
  1094. resume();
  1095. }
  1096. else {
  1097. pause();
  1098. }
  1099. }
  1100. /**
  1101. * Checks if we are currently in the paused mode.
  1102. */
  1103. function isPaused() {
  1104. return dom.wrapper.classList.contains( 'paused' );
  1105. }
  1106. /**
  1107. * Steps from the current point in the presentation to the
  1108. * slide which matches the specified horizontal and vertical
  1109. * indices.
  1110. *
  1111. * @param {int} h Horizontal index of the target slide
  1112. * @param {int} v Vertical index of the target slide
  1113. * @param {int} f Optional index of a fragment within the
  1114. * target slide to activate
  1115. * @param {int} o Optional origin for use in multimaster environments
  1116. */
  1117. function slide( h, v, f, o ) {
  1118. // Remember where we were at before
  1119. previousSlide = currentSlide;
  1120. // Query all horizontal slides in the deck
  1121. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1122. // If no vertical index is specified and the upcoming slide is a
  1123. // stack, resume at its previous vertical index
  1124. if( v === undefined ) {
  1125. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1126. }
  1127. // If we were on a vertical stack, remember what vertical index
  1128. // it was on so we can resume at the same position when returning
  1129. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1130. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1131. }
  1132. // Remember the state before this slide
  1133. var stateBefore = state.concat();
  1134. // Reset the state array
  1135. state.length = 0;
  1136. var indexhBefore = indexh || 0,
  1137. indexvBefore = indexv || 0;
  1138. // Activate and transition to the new slide
  1139. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1140. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1141. // Update the visibility of slides now that the indices have changed
  1142. updateSlidesVisibility();
  1143. layout();
  1144. // Apply the new state
  1145. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1146. // Check if this state existed on the previous slide. If it
  1147. // did, we will avoid adding it repeatedly
  1148. for( var j = 0; j < stateBefore.length; j++ ) {
  1149. if( stateBefore[j] === state[i] ) {
  1150. stateBefore.splice( j, 1 );
  1151. continue stateLoop;
  1152. }
  1153. }
  1154. document.documentElement.classList.add( state[i] );
  1155. // Dispatch custom event matching the state's name
  1156. dispatchEvent( state[i] );
  1157. }
  1158. // Clean up the remains of the previous state
  1159. while( stateBefore.length ) {
  1160. document.documentElement.classList.remove( stateBefore.pop() );
  1161. }
  1162. // If the overview is active, re-activate it to update positions
  1163. if( isOverview() ) {
  1164. activateOverview();
  1165. }
  1166. // Find the current horizontal slide and any possible vertical slides
  1167. // within it
  1168. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1169. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1170. // Store references to the previous and current slides
  1171. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1172. // Show fragment, if specified
  1173. if( typeof f !== 'undefined' ) {
  1174. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  1175. toArray( fragments ).forEach( function( fragment, indexf ) {
  1176. if( indexf < f ) {
  1177. fragment.classList.add( 'visible' );
  1178. }
  1179. else {
  1180. fragment.classList.remove( 'visible' );
  1181. }
  1182. } );
  1183. }
  1184. // Dispatch an event if the slide changed
  1185. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1186. if( slideChanged ) {
  1187. dispatchEvent( 'slidechanged', {
  1188. 'indexh': indexh,
  1189. 'indexv': indexv,
  1190. 'previousSlide': previousSlide,
  1191. 'currentSlide': currentSlide,
  1192. 'origin': o
  1193. } );
  1194. }
  1195. else {
  1196. // Ensure that the previous slide is never the same as the current
  1197. previousSlide = null;
  1198. }
  1199. // Solves an edge case where the previous slide maintains the
  1200. // 'present' class when navigating between adjacent vertical
  1201. // stacks
  1202. if( previousSlide ) {
  1203. previousSlide.classList.remove( 'present' );
  1204. // Reset all slides upon navigate to home
  1205. // Issue: #285
  1206. if ( document.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1207. // Launch async task
  1208. setTimeout( function () {
  1209. var slides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1210. for( i in slides ) {
  1211. if( slides[i] ) {
  1212. // Reset stack
  1213. setPreviousVerticalIndex( slides[i], 0 );
  1214. }
  1215. }
  1216. }, 0 );
  1217. }
  1218. }
  1219. // Handle embedded content
  1220. if( slideChanged ) {
  1221. stopEmbeddedContent( previousSlide );
  1222. startEmbeddedContent( currentSlide );
  1223. }
  1224. updateControls();
  1225. updateProgress();
  1226. updateBackground();
  1227. updateParallax();
  1228. updateSlideNumber();
  1229. // Update the URL hash
  1230. writeURL();
  1231. cueAutoSlide();
  1232. }
  1233. /**
  1234. * Syncs the presentation with the current DOM. Useful
  1235. * when new slides or control elements are added or when
  1236. * the configuration has changed.
  1237. */
  1238. function sync() {
  1239. // Subscribe to input
  1240. removeEventListeners();
  1241. addEventListeners();
  1242. // Force a layout to make sure the current config is accounted for
  1243. layout();
  1244. // Reflect the current autoSlide value
  1245. autoSlide = config.autoSlide;
  1246. // Start auto-sliding if it's enabled
  1247. cueAutoSlide();
  1248. // Re-create the slide backgrounds
  1249. createBackgrounds();
  1250. updateControls();
  1251. updateProgress();
  1252. updateBackground( true );
  1253. updateSlideNumber();
  1254. }
  1255. /**
  1256. * Updates one dimension of slides by showing the slide
  1257. * with the specified index.
  1258. *
  1259. * @param {String} selector A CSS selector that will fetch
  1260. * the group of slides we are working with
  1261. * @param {Number} index The index of the slide that should be
  1262. * shown
  1263. *
  1264. * @return {Number} The index of the slide that is now shown,
  1265. * might differ from the passed in index if it was out of
  1266. * bounds.
  1267. */
  1268. function updateSlides( selector, index ) {
  1269. // Select all slides and convert the NodeList result to
  1270. // an array
  1271. var slides = toArray( document.querySelectorAll( selector ) ),
  1272. slidesLength = slides.length;
  1273. if( slidesLength ) {
  1274. // Should the index loop?
  1275. if( config.loop ) {
  1276. index %= slidesLength;
  1277. if( index < 0 ) {
  1278. index = slidesLength + index;
  1279. }
  1280. }
  1281. // Enforce max and minimum index bounds
  1282. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1283. for( var i = 0; i < slidesLength; i++ ) {
  1284. var element = slides[i];
  1285. var reverse = config.rtl && !isVerticalSlide( element );
  1286. element.classList.remove( 'past' );
  1287. element.classList.remove( 'present' );
  1288. element.classList.remove( 'future' );
  1289. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1290. element.setAttribute( 'hidden', '' );
  1291. if( i < index ) {
  1292. // Any element previous to index is given the 'past' class
  1293. element.classList.add( reverse ? 'future' : 'past' );
  1294. var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
  1295. // Show all fragments on prior slides
  1296. while( pastFragments.length ) {
  1297. pastFragments.pop().classList.add( 'visible' );
  1298. }
  1299. }
  1300. else if( i > index ) {
  1301. // Any element subsequent to index is given the 'future' class
  1302. element.classList.add( reverse ? 'past' : 'future' );
  1303. var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1304. // No fragments in future slides should be visible ahead of time
  1305. while( futureFragments.length ) {
  1306. futureFragments.pop().classList.remove( 'visible' );
  1307. }
  1308. }
  1309. // If this element contains vertical slides
  1310. if( element.querySelector( 'section' ) ) {
  1311. element.classList.add( 'stack' );
  1312. }
  1313. }
  1314. // Mark the current slide as present
  1315. slides[index].classList.add( 'present' );
  1316. slides[index].removeAttribute( 'hidden' );
  1317. // If this slide has a state associated with it, add it
  1318. // onto the current state of the deck
  1319. var slideState = slides[index].getAttribute( 'data-state' );
  1320. if( slideState ) {
  1321. state = state.concat( slideState.split( ' ' ) );
  1322. }
  1323. }
  1324. else {
  1325. // Since there are no slides we can't be anywhere beyond the
  1326. // zeroth index
  1327. index = 0;
  1328. }
  1329. return index;
  1330. }
  1331. /**
  1332. * Optimization method; hide all slides that are far away
  1333. * from the present slide.
  1334. */
  1335. function updateSlidesVisibility() {
  1336. // Select all slides and convert the NodeList result to
  1337. // an array
  1338. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1339. horizontalSlidesLength = horizontalSlides.length,
  1340. distanceX,
  1341. distanceY;
  1342. if( horizontalSlidesLength ) {
  1343. // The number of steps away from the present slide that will
  1344. // be visible
  1345. var viewDistance = isOverview() ? 10 : config.viewDistance;
  1346. // Limit view distance on weaker devices
  1347. if( isMobileDevice ) {
  1348. viewDistance = isOverview() ? 6 : 1;
  1349. }
  1350. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1351. var horizontalSlide = horizontalSlides[x];
  1352. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1353. verticalSlidesLength = verticalSlides.length;
  1354. // Loops so that it measures 1 between the first and last slides
  1355. distanceX = Math.abs( ( indexh - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1356. // Show the horizontal slide if it's within the view distance
  1357. horizontalSlide.style.display = distanceX > viewDistance ? 'none' : 'block';
  1358. if( verticalSlidesLength ) {
  1359. var oy = getPreviousVerticalIndex( horizontalSlide );
  1360. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1361. var verticalSlide = verticalSlides[y];
  1362. distanceY = x === indexh ? Math.abs( indexv - y ) : Math.abs( y - oy );
  1363. verticalSlide.style.display = ( distanceX + distanceY ) > viewDistance ? 'none' : 'block';
  1364. }
  1365. }
  1366. }
  1367. }
  1368. }
  1369. /**
  1370. * Updates the progress bar to reflect the current slide.
  1371. */
  1372. function updateProgress() {
  1373. // Update progress if enabled
  1374. if( config.progress && dom.progress ) {
  1375. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1376. // The number of past and total slides
  1377. var totalCount = document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  1378. var pastCount = 0;
  1379. // Step through all slides and count the past ones
  1380. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  1381. var horizontalSlide = horizontalSlides[i];
  1382. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1383. for( var j = 0; j < verticalSlides.length; j++ ) {
  1384. // Stop as soon as we arrive at the present
  1385. if( verticalSlides[j].classList.contains( 'present' ) ) {
  1386. break mainLoop;
  1387. }
  1388. pastCount++;
  1389. }
  1390. // Stop as soon as we arrive at the present
  1391. if( horizontalSlide.classList.contains( 'present' ) ) {
  1392. break;
  1393. }
  1394. // Don't count the wrapping section for vertical slides
  1395. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  1396. pastCount++;
  1397. }
  1398. }
  1399. dom.progressbar.style.width = ( pastCount / ( totalCount - 1 ) ) * window.innerWidth + 'px';
  1400. }
  1401. }
  1402. /**
  1403. * Updates the slide number div to reflect the current slide.
  1404. */
  1405. function updateSlideNumber() {
  1406. // Update slide number if enabled
  1407. if( config.showSlideNumber && dom.slideNumber) {
  1408. // Display the number of the page using 'indexh - indexv' format
  1409. var indexString = indexh;
  1410. if( indexv > 0 ) {
  1411. indexString += ' - ' + indexv;
  1412. }
  1413. dom.slideNumber.innerHTML = indexString;
  1414. }
  1415. }
  1416. /**
  1417. * Updates the state of all control/navigation arrows.
  1418. */
  1419. function updateControls() {
  1420. var routes = availableRoutes();
  1421. var fragments = availableFragments();
  1422. // Remove the 'enabled' class from all directions
  1423. dom.controlsLeft.concat( dom.controlsRight )
  1424. .concat( dom.controlsUp )
  1425. .concat( dom.controlsDown )
  1426. .concat( dom.controlsPrev )
  1427. .concat( dom.controlsNext ).forEach( function( node ) {
  1428. node.classList.remove( 'enabled' );
  1429. node.classList.remove( 'fragmented' );
  1430. } );
  1431. // Add the 'enabled' class to the available routes
  1432. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1433. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1434. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1435. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1436. // Prev/next buttons
  1437. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1438. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1439. // Highlight fragment directions
  1440. if( currentSlide ) {
  1441. // Always apply fragment decorator to prev/next buttons
  1442. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1443. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1444. // Apply fragment decorators to directional buttons based on
  1445. // what slide axis they are in
  1446. if( isVerticalSlide( currentSlide ) ) {
  1447. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1448. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1449. }
  1450. else {
  1451. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1452. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1453. }
  1454. }
  1455. }
  1456. /**
  1457. * Updates the background elements to reflect the current
  1458. * slide.
  1459. *
  1460. * @param {Boolean} includeAll If true, the backgrounds of
  1461. * all vertical slides (not just the present) will be updated.
  1462. */
  1463. function updateBackground( includeAll ) {
  1464. var currentBackground = null;
  1465. // Reverse past/future classes when in RTL mode
  1466. var horizontalPast = config.rtl ? 'future' : 'past',
  1467. horizontalFuture = config.rtl ? 'past' : 'future';
  1468. // Update the classes of all backgrounds to match the
  1469. // states of their slides (past/present/future)
  1470. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  1471. if( h < indexh ) {
  1472. backgroundh.className = 'slide-background ' + horizontalPast;
  1473. }
  1474. else if ( h > indexh ) {
  1475. backgroundh.className = 'slide-background ' + horizontalFuture;
  1476. }
  1477. else {
  1478. backgroundh.className = 'slide-background present';
  1479. // Store a reference to the current background element
  1480. currentBackground = backgroundh;
  1481. }
  1482. if( includeAll || h === indexh ) {
  1483. toArray( backgroundh.childNodes ).forEach( function( backgroundv, v ) {
  1484. if( v < indexv ) {
  1485. backgroundv.className = 'slide-background past';
  1486. }
  1487. else if ( v > indexv ) {
  1488. backgroundv.className = 'slide-background future';
  1489. }
  1490. else {
  1491. backgroundv.className = 'slide-background present';
  1492. // Only if this is the present horizontal and vertical slide
  1493. if( h === indexh ) currentBackground = backgroundv;
  1494. }
  1495. } );
  1496. }
  1497. } );
  1498. // Don't transition between identical backgrounds. This
  1499. // prevents unwanted flicker.
  1500. if( currentBackground ) {
  1501. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  1502. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  1503. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  1504. dom.background.classList.add( 'no-transition' );
  1505. }
  1506. previousBackground = currentBackground;
  1507. }
  1508. // Allow the first background to apply without transition
  1509. setTimeout( function() {
  1510. dom.background.classList.remove( 'no-transition' );
  1511. }, 1 );
  1512. }
  1513. /**
  1514. * Updates the position of the parallax background based
  1515. * on the current slide index.
  1516. */
  1517. function updateParallax() {
  1518. if( config.parallaxBackgroundImage ) {
  1519. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1520. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1521. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  1522. backgroundWidth, backgroundHeight;
  1523. if( backgroundSize.length === 1 ) {
  1524. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  1525. }
  1526. else {
  1527. backgroundWidth = parseInt( backgroundSize[0], 10 );
  1528. backgroundHeight = parseInt( backgroundSize[1], 10 );
  1529. }
  1530. var slideWidth = dom.background.offsetWidth;
  1531. var horizontalSlideCount = horizontalSlides.length;
  1532. var horizontalOffset = -( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) * indexh;
  1533. var slideHeight = dom.background.offsetHeight;
  1534. var verticalSlideCount = verticalSlides.length;
  1535. var verticalOffset = verticalSlideCount > 0 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0;
  1536. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
  1537. }
  1538. }
  1539. /**
  1540. * Determine what available routes there are for navigation.
  1541. *
  1542. * @return {Object} containing four booleans: left/right/up/down
  1543. */
  1544. function availableRoutes() {
  1545. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1546. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1547. var routes = {
  1548. left: indexh > 0 || config.loop,
  1549. right: indexh < horizontalSlides.length - 1 || config.loop,
  1550. up: indexv > 0,
  1551. down: indexv < verticalSlides.length - 1
  1552. };
  1553. // reverse horizontal controls for rtl
  1554. if( config.rtl ) {
  1555. var left = routes.left;
  1556. routes.left = routes.right;
  1557. routes.right = left;
  1558. }
  1559. return routes;
  1560. }
  1561. /**
  1562. * Returns an object describing the available fragment
  1563. * directions.
  1564. *
  1565. * @return {Object} two boolean properties: prev/next
  1566. */
  1567. function availableFragments() {
  1568. if( currentSlide && config.fragments ) {
  1569. var fragments = currentSlide.querySelectorAll( '.fragment' );
  1570. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  1571. return {
  1572. prev: fragments.length - hiddenFragments.length > 0,
  1573. next: !!hiddenFragments.length
  1574. };
  1575. }
  1576. else {
  1577. return { prev: false, next: false };
  1578. }
  1579. }
  1580. /**
  1581. * Start playback of any embedded content inside of
  1582. * the targeted slide.
  1583. */
  1584. function startEmbeddedContent( slide ) {
  1585. if( slide && !isSpeakerNotes() ) {
  1586. // HTML5 media elements
  1587. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1588. if( el.hasAttribute( 'data-autoplay' ) ) {
  1589. el.play();
  1590. }
  1591. } );
  1592. // iframe embeds
  1593. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  1594. el.contentWindow.postMessage( 'slide:start', '*' );
  1595. });
  1596. // YouTube embeds
  1597. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1598. if( el.hasAttribute( 'data-autoplay' ) ) {
  1599. el.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  1600. }
  1601. });
  1602. }
  1603. }
  1604. /**
  1605. * Stop playback of any embedded content inside of
  1606. * the targeted slide.
  1607. */
  1608. function stopEmbeddedContent( slide ) {
  1609. if( slide ) {
  1610. // HTML5 media elements
  1611. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1612. if( !el.hasAttribute( 'data-ignore' ) ) {
  1613. el.pause();
  1614. }
  1615. } );
  1616. // iframe embeds
  1617. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  1618. el.contentWindow.postMessage( 'slide:stop', '*' );
  1619. });
  1620. // YouTube embeds
  1621. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1622. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  1623. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  1624. }
  1625. });
  1626. }
  1627. }
  1628. /**
  1629. * Checks if this presentation is running inside of the
  1630. * speaker notes window.
  1631. */
  1632. function isSpeakerNotes() {
  1633. return !!window.location.search.match( /receiver/gi );
  1634. }
  1635. /**
  1636. * Reads the current URL (hash) and navigates accordingly.
  1637. */
  1638. function readURL() {
  1639. var hash = window.location.hash;
  1640. // Attempt to parse the hash as either an index or name
  1641. var bits = hash.slice( 2 ).split( '/' ),
  1642. name = hash.replace( /#|\//gi, '' );
  1643. // If the first bit is invalid and there is a name we can
  1644. // assume that this is a named link
  1645. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  1646. // Find the slide with the specified name
  1647. var element = document.querySelector( '#' + name );
  1648. if( element ) {
  1649. // Find the position of the named slide and navigate to it
  1650. var indices = Reveal.getIndices( element );
  1651. slide( indices.h, indices.v );
  1652. }
  1653. // If the slide doesn't exist, navigate to the current slide
  1654. else {
  1655. slide( indexh || 0, indexv || 0 );
  1656. }
  1657. }
  1658. else {
  1659. // Read the index components of the hash
  1660. var h = parseInt( bits[0], 10 ) || 0,
  1661. v = parseInt( bits[1], 10 ) || 0;
  1662. if( h !== indexh || v !== indexv ) {
  1663. slide( h, v );
  1664. }
  1665. }
  1666. }
  1667. /**
  1668. * Updates the page URL (hash) to reflect the current
  1669. * state.
  1670. *
  1671. * @param {Number} delay The time in ms to wait before
  1672. * writing the hash
  1673. */
  1674. function writeURL( delay ) {
  1675. if( config.history ) {
  1676. // Make sure there's never more than one timeout running
  1677. clearTimeout( writeURLTimeout );
  1678. // If a delay is specified, timeout this call
  1679. if( typeof delay === 'number' ) {
  1680. writeURLTimeout = setTimeout( writeURL, delay );
  1681. }
  1682. else {
  1683. var url = '/';
  1684. // If the current slide has an ID, use that as a named link
  1685. if( currentSlide && typeof currentSlide.getAttribute( 'id' ) === 'string' ) {
  1686. url = '/' + currentSlide.getAttribute( 'id' );
  1687. }
  1688. // Otherwise use the /h/v index
  1689. else {
  1690. if( indexh > 0 || indexv > 0 ) url += indexh;
  1691. if( indexv > 0 ) url += '/' + indexv;
  1692. }
  1693. window.location.hash = url;
  1694. }
  1695. }
  1696. }
  1697. /**
  1698. * Retrieves the h/v location of the current, or specified,
  1699. * slide.
  1700. *
  1701. * @param {HTMLElement} slide If specified, the returned
  1702. * index will be for this slide rather than the currently
  1703. * active one
  1704. *
  1705. * @return {Object} { h: <int>, v: <int>, f: <int> }
  1706. */
  1707. function getIndices( slide ) {
  1708. // By default, return the current indices
  1709. var h = indexh,
  1710. v = indexv,
  1711. f;
  1712. // If a slide is specified, return the indices of that slide
  1713. if( slide ) {
  1714. var isVertical = isVerticalSlide( slide );
  1715. var slideh = isVertical ? slide.parentNode : slide;
  1716. // Select all horizontal slides
  1717. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1718. // Now that we know which the horizontal slide is, get its index
  1719. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  1720. // If this is a vertical slide, grab the vertical index
  1721. if( isVertical ) {
  1722. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  1723. }
  1724. }
  1725. if( !slide && currentSlide ) {
  1726. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  1727. if( hasFragments ) {
  1728. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  1729. f = visibleFragments.length;
  1730. }
  1731. }
  1732. return { h: h, v: v, f: f };
  1733. }
  1734. /**
  1735. * Navigate to the next slide fragment.
  1736. *
  1737. * @return {Boolean} true if there was a next fragment,
  1738. * false otherwise
  1739. */
  1740. function nextFragment() {
  1741. if( currentSlide && config.fragments ) {
  1742. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment:not(.visible)' ) );
  1743. if( fragments.length ) {
  1744. // Find the index of the next fragment
  1745. var index = fragments[0].getAttribute( 'data-fragment-index' );
  1746. // Find all fragments with the same index
  1747. fragments = currentSlide.querySelectorAll( '.fragment[data-fragment-index="'+ index +'"]' );
  1748. toArray( fragments ).forEach( function( element ) {
  1749. element.classList.add( 'visible' );
  1750. } );
  1751. // Notify subscribers of the change
  1752. dispatchEvent( 'fragmentshown', { fragment: fragments[0], fragments: fragments } );
  1753. updateControls();
  1754. return true;
  1755. }
  1756. }
  1757. return false;
  1758. }
  1759. /**
  1760. * Navigate to the previous slide fragment.
  1761. *
  1762. * @return {Boolean} true if there was a previous fragment,
  1763. * false otherwise
  1764. */
  1765. function previousFragment() {
  1766. if( currentSlide && config.fragments ) {
  1767. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) );
  1768. if( fragments.length ) {
  1769. // Find the index of the previous fragment
  1770. var index = fragments[ fragments.length - 1 ].getAttribute( 'data-fragment-index' );
  1771. // Find all fragments with the same index
  1772. fragments = currentSlide.querySelectorAll( '.fragment[data-fragment-index="'+ index +'"]' );
  1773. toArray( fragments ).forEach( function( f ) {
  1774. f.classList.remove( 'visible' );
  1775. } );
  1776. // Notify subscribers of the change
  1777. dispatchEvent( 'fragmenthidden', { fragment: fragments[0], fragments: fragments } );
  1778. updateControls();
  1779. return true;
  1780. }
  1781. }
  1782. return false;
  1783. }
  1784. /**
  1785. * Cues a new automated slide if enabled in the config.
  1786. */
  1787. function cueAutoSlide() {
  1788. cancelAutoSlide();
  1789. if( currentSlide ) {
  1790. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  1791. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  1792. // Pick value in the following priority order:
  1793. // 1. Current slide's data-autoslide
  1794. // 2. Parent slide's data-autoslide
  1795. // 3. Global autoSlide setting
  1796. if( slideAutoSlide ) {
  1797. autoSlide = parseInt( slideAutoSlide, 10 );
  1798. }
  1799. else if( parentAutoSlide ) {
  1800. autoSlide = parseInt( parentAutoSlide, 10 );
  1801. }
  1802. else {
  1803. autoSlide = config.autoSlide;
  1804. }
  1805. // Cue the next auto-slide if:
  1806. // - There is an autoSlide value
  1807. // - Auto-sliding isn't paused by the user
  1808. // - The presentation isn't paused
  1809. // - The overview isn't active
  1810. // - The presentation isn't over
  1811. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || config.loop === true ) ) {
  1812. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  1813. autoSlideStartTime = Date.now();
  1814. }
  1815. if( autoSlidePlayer ) {
  1816. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  1817. }
  1818. }
  1819. }
  1820. /**
  1821. * Cancels any ongoing request to auto-slide.
  1822. */
  1823. function cancelAutoSlide() {
  1824. clearTimeout( autoSlideTimeout );
  1825. autoSlideTimeout = -1;
  1826. }
  1827. function pauseAutoSlide() {
  1828. autoSlidePaused = true;
  1829. clearTimeout( autoSlideTimeout );
  1830. if( autoSlidePlayer ) {
  1831. autoSlidePlayer.setPlaying( false );
  1832. }
  1833. }
  1834. function resumeAutoSlide() {
  1835. autoSlidePaused = false;
  1836. cueAutoSlide();
  1837. }
  1838. function navigateLeft() {
  1839. // Reverse for RTL
  1840. if( config.rtl ) {
  1841. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  1842. slide( indexh + 1 );
  1843. }
  1844. }
  1845. // Normal navigation
  1846. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  1847. slide( indexh - 1 );
  1848. }
  1849. }
  1850. function navigateRight() {
  1851. // Reverse for RTL
  1852. if( config.rtl ) {
  1853. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  1854. slide( indexh - 1 );
  1855. }
  1856. }
  1857. // Normal navigation
  1858. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  1859. slide( indexh + 1 );
  1860. }
  1861. }
  1862. function navigateUp() {
  1863. // Prioritize hiding fragments
  1864. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  1865. slide( indexh, indexv - 1 );
  1866. }
  1867. }
  1868. function navigateDown() {
  1869. // Prioritize revealing fragments
  1870. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  1871. slide( indexh, indexv + 1 );
  1872. }
  1873. }
  1874. /**
  1875. * Navigates backwards, prioritized in the following order:
  1876. * 1) Previous fragment
  1877. * 2) Previous vertical slide
  1878. * 3) Previous horizontal slide
  1879. */
  1880. function navigatePrev() {
  1881. // Prioritize revealing fragments
  1882. if( previousFragment() === false ) {
  1883. if( availableRoutes().up ) {
  1884. navigateUp();
  1885. }
  1886. else {
  1887. // Fetch the previous horizontal slide, if there is one
  1888. var previousSlide = document.querySelector( HORIZONTAL_SLIDES_SELECTOR + '.past:nth-child(' + indexh + ')' );
  1889. if( previousSlide ) {
  1890. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  1891. var h = indexh - 1;
  1892. slide( h, v );
  1893. }
  1894. }
  1895. }
  1896. }
  1897. /**
  1898. * Same as #navigatePrev() but navigates forwards.
  1899. */
  1900. function navigateNext() {
  1901. // Prioritize revealing fragments
  1902. if( nextFragment() === false ) {
  1903. availableRoutes().down ? navigateDown() : navigateRight();
  1904. }
  1905. // If auto-sliding is enabled we need to cue up
  1906. // another timeout
  1907. cueAutoSlide();
  1908. }
  1909. // --------------------------------------------------------------------//
  1910. // ----------------------------- EVENTS -------------------------------//
  1911. // --------------------------------------------------------------------//
  1912. /**
  1913. * Called by all event handlers that are based on user
  1914. * input.
  1915. */
  1916. function onUserInput( event ) {
  1917. if( config.autoSlideStoppable ) {
  1918. pauseAutoSlide();
  1919. }
  1920. }
  1921. /**
  1922. * Handler for the document level 'keydown' event.
  1923. */
  1924. function onDocumentKeyDown( event ) {
  1925. onUserInput( event );
  1926. // Check if there's a focused element that could be using
  1927. // the keyboard
  1928. var activeElement = document.activeElement;
  1929. var hasFocus = !!( document.activeElement && ( document.activeElement.type || document.activeElement.href || document.activeElement.contentEditable !== 'inherit' ) );
  1930. // Disregard the event if there's a focused element or a
  1931. // keyboard modifier key is present
  1932. if( hasFocus || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  1933. // While paused only allow "unpausing" keyboard events (b and .)
  1934. if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) {
  1935. return false;
  1936. }
  1937. var triggered = false;
  1938. // 1. User defined key bindings
  1939. if( typeof config.keyboard === 'object' ) {
  1940. for( var key in config.keyboard ) {
  1941. // Check if this binding matches the pressed key
  1942. if( parseInt( key, 10 ) === event.keyCode ) {
  1943. var value = config.keyboard[ key ];
  1944. // Callback function
  1945. if( typeof value === 'function' ) {
  1946. value.apply( null, [ event ] );
  1947. }
  1948. // String shortcuts to reveal.js API
  1949. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  1950. Reveal[ value ].call();
  1951. }
  1952. triggered = true;
  1953. }
  1954. }
  1955. }
  1956. // 2. System defined key bindings
  1957. if( triggered === false ) {
  1958. // Assume true and try to prove false
  1959. triggered = true;
  1960. switch( event.keyCode ) {
  1961. // p, page up
  1962. case 80: case 33: navigatePrev(); break;
  1963. // n, page down
  1964. case 78: case 34: navigateNext(); break;
  1965. // h, left
  1966. case 72: case 37: navigateLeft(); break;
  1967. // l, right
  1968. case 76: case 39: navigateRight(); break;
  1969. // k, up
  1970. case 75: case 38: navigateUp(); break;
  1971. // j, down
  1972. case 74: case 40: navigateDown(); break;
  1973. // home
  1974. case 36: slide( 0 ); break;
  1975. // end
  1976. case 35: slide( Number.MAX_VALUE ); break;
  1977. // space
  1978. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  1979. // return
  1980. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  1981. // b, period, Logitech presenter tools "black screen" button
  1982. case 66: case 190: case 191: togglePause(); break;
  1983. // f
  1984. case 70: enterFullscreen(); break;
  1985. default:
  1986. triggered = false;
  1987. }
  1988. }
  1989. // If the input resulted in a triggered action we should prevent
  1990. // the browsers default behavior
  1991. if( triggered ) {
  1992. event.preventDefault();
  1993. }
  1994. // ESC or O key
  1995. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  1996. if( dom.preview ) {
  1997. closePreview();
  1998. }
  1999. else {
  2000. toggleOverview();
  2001. }
  2002. event.preventDefault();
  2003. }
  2004. // If auto-sliding is enabled we need to cue up
  2005. // another timeout
  2006. cueAutoSlide();
  2007. }
  2008. /**
  2009. * Handler for the 'touchstart' event, enables support for
  2010. * swipe and pinch gestures.
  2011. */
  2012. function onTouchStart( event ) {
  2013. touch.startX = event.touches[0].clientX;
  2014. touch.startY = event.touches[0].clientY;
  2015. touch.startCount = event.touches.length;
  2016. // If there's two touches we need to memorize the distance
  2017. // between those two points to detect pinching
  2018. if( event.touches.length === 2 && config.overview ) {
  2019. touch.startSpan = distanceBetween( {
  2020. x: event.touches[1].clientX,
  2021. y: event.touches[1].clientY
  2022. }, {
  2023. x: touch.startX,
  2024. y: touch.startY
  2025. } );
  2026. }
  2027. }
  2028. /**
  2029. * Handler for the 'touchmove' event.
  2030. */
  2031. function onTouchMove( event ) {
  2032. // Each touch should only trigger one action
  2033. if( !touch.captured ) {
  2034. onUserInput( event );
  2035. var currentX = event.touches[0].clientX;
  2036. var currentY = event.touches[0].clientY;
  2037. // If the touch started with two points and still has
  2038. // two active touches; test for the pinch gesture
  2039. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  2040. // The current distance in pixels between the two touch points
  2041. var currentSpan = distanceBetween( {
  2042. x: event.touches[1].clientX,
  2043. y: event.touches[1].clientY
  2044. }, {
  2045. x: touch.startX,
  2046. y: touch.startY
  2047. } );
  2048. // If the span is larger than the desire amount we've got
  2049. // ourselves a pinch
  2050. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  2051. touch.captured = true;
  2052. if( currentSpan < touch.startSpan ) {
  2053. activateOverview();
  2054. }
  2055. else {
  2056. deactivateOverview();
  2057. }
  2058. }
  2059. event.preventDefault();
  2060. }
  2061. // There was only one touch point, look for a swipe
  2062. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  2063. var deltaX = currentX - touch.startX,
  2064. deltaY = currentY - touch.startY;
  2065. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2066. touch.captured = true;
  2067. navigateLeft();
  2068. }
  2069. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  2070. touch.captured = true;
  2071. navigateRight();
  2072. }
  2073. else if( deltaY > touch.threshold ) {
  2074. touch.captured = true;
  2075. navigateUp();
  2076. }
  2077. else if( deltaY < -touch.threshold ) {
  2078. touch.captured = true;
  2079. navigateDown();
  2080. }
  2081. // If we're embedded, only block touch events if they have
  2082. // triggered an action
  2083. if( config.embedded ) {
  2084. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  2085. event.preventDefault();
  2086. }
  2087. }
  2088. // Not embedded? Block them all to avoid needless tossing
  2089. // around of the viewport in iOS
  2090. else {
  2091. event.preventDefault();
  2092. }
  2093. }
  2094. }
  2095. // There's a bug with swiping on some Android devices unless
  2096. // the default action is always prevented
  2097. else if( navigator.userAgent.match( /android/gi ) ) {
  2098. event.preventDefault();
  2099. }
  2100. }
  2101. /**
  2102. * Handler for the 'touchend' event.
  2103. */
  2104. function onTouchEnd( event ) {
  2105. touch.captured = false;
  2106. }
  2107. /**
  2108. * Convert pointer down to touch start.
  2109. */
  2110. function onPointerDown( event ) {
  2111. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH ) {
  2112. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2113. onTouchStart( event );
  2114. }
  2115. }
  2116. /**
  2117. * Convert pointer move to touch move.
  2118. */
  2119. function onPointerMove( event ) {
  2120. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH ) {
  2121. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2122. onTouchMove( event );
  2123. }
  2124. }
  2125. /**
  2126. * Convert pointer up to touch end.
  2127. */
  2128. function onPointerUp( event ) {
  2129. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH ) {
  2130. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  2131. onTouchEnd( event );
  2132. }
  2133. }
  2134. /**
  2135. * Handles mouse wheel scrolling, throttled to avoid skipping
  2136. * multiple slides.
  2137. */
  2138. function onDocumentMouseScroll( event ) {
  2139. if( Date.now() - lastMouseWheelStep > 600 ) {
  2140. lastMouseWheelStep = Date.now();
  2141. var delta = event.detail || -event.wheelDelta;
  2142. if( delta > 0 ) {
  2143. navigateNext();
  2144. }
  2145. else {
  2146. navigatePrev();
  2147. }
  2148. }
  2149. }
  2150. /**
  2151. * Clicking on the progress bar results in a navigation to the
  2152. * closest approximate horizontal slide using this equation:
  2153. *
  2154. * ( clickX / presentationWidth ) * numberOfSlides
  2155. */
  2156. function onProgressClicked( event ) {
  2157. onUserInput( event );
  2158. event.preventDefault();
  2159. var slidesTotal = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  2160. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  2161. slide( slideIndex );
  2162. }
  2163. /**
  2164. * Event handler for navigation control buttons.
  2165. */
  2166. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  2167. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  2168. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  2169. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  2170. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  2171. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  2172. /**
  2173. * Handler for the window level 'hashchange' event.
  2174. */
  2175. function onWindowHashChange( event ) {
  2176. readURL();
  2177. }
  2178. /**
  2179. * Handler for the window level 'resize' event.
  2180. */
  2181. function onWindowResize( event ) {
  2182. layout();
  2183. }
  2184. /**
  2185. * Handle for the window level 'visibilitychange' event.
  2186. */
  2187. function onPageVisibilityChange( event ) {
  2188. var isHidden = document.webkitHidden ||
  2189. document.msHidden ||
  2190. document.hidden;
  2191. // If, after clicking a link or similar and we're coming back,
  2192. // focus the document.body to ensure we can use keyboard shortcuts
  2193. if( isHidden === false && document.activeElement !== document.body ) {
  2194. document.activeElement.blur();
  2195. document.body.focus();
  2196. }
  2197. }
  2198. /**
  2199. * Invoked when a slide is and we're in the overview.
  2200. */
  2201. function onOverviewSlideClicked( event ) {
  2202. // TODO There's a bug here where the event listeners are not
  2203. // removed after deactivating the overview.
  2204. if( eventsAreBound && isOverview() ) {
  2205. event.preventDefault();
  2206. var element = event.target;
  2207. while( element && !element.nodeName.match( /section/gi ) ) {
  2208. element = element.parentNode;
  2209. }
  2210. if( element && !element.classList.contains( 'disabled' ) ) {
  2211. deactivateOverview();
  2212. if( element.nodeName.match( /section/gi ) ) {
  2213. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  2214. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  2215. slide( h, v );
  2216. }
  2217. }
  2218. }
  2219. }
  2220. /**
  2221. * Handles clicks on links that are set to preview in the
  2222. * iframe overlay.
  2223. */
  2224. function onPreviewLinkClicked( event ) {
  2225. var url = event.target.getAttribute( 'href' );
  2226. if( url ) {
  2227. openPreview( url );
  2228. event.preventDefault();
  2229. }
  2230. }
  2231. /**
  2232. * Handles click on the auto-sliding controls element.
  2233. */
  2234. function onAutoSlidePlayerClick( event ) {
  2235. // Replay
  2236. if( Reveal.isLastSlide() && config.loop === false ) {
  2237. slide( 0, 0 );
  2238. resumeAutoSlide();
  2239. }
  2240. // Resume
  2241. else if( autoSlidePaused ) {
  2242. resumeAutoSlide();
  2243. }
  2244. // Pause
  2245. else {
  2246. pauseAutoSlide();
  2247. }
  2248. }
  2249. // --------------------------------------------------------------------//
  2250. // ------------------------ PLAYBACK COMPONENT ------------------------//
  2251. // --------------------------------------------------------------------//
  2252. /**
  2253. * Constructor for the playback component, which displays
  2254. * play/pause/progress controls.
  2255. *
  2256. * @param {HTMLElement} container The component will append
  2257. * itself to this
  2258. * @param {Function} progressCheck A method which will be
  2259. * called frequently to get the current progress on a range
  2260. * of 0-1
  2261. */
  2262. function Playback( container, progressCheck ) {
  2263. // Cosmetics
  2264. this.diameter = 50;
  2265. this.thickness = 3;
  2266. // Flags if we are currently playing
  2267. this.playing = false;
  2268. // Current progress on a 0-1 range
  2269. this.progress = 0;
  2270. // Used to loop the animation smoothly
  2271. this.progressOffset = 1;
  2272. this.container = container;
  2273. this.progressCheck = progressCheck;
  2274. this.canvas = document.createElement( 'canvas' );
  2275. this.canvas.className = 'playback';
  2276. this.canvas.width = this.diameter;
  2277. this.canvas.height = this.diameter;
  2278. this.context = this.canvas.getContext( '2d' );
  2279. this.container.appendChild( this.canvas );
  2280. this.render();
  2281. }
  2282. Playback.prototype.setPlaying = function( value ) {
  2283. var wasPlaying = this.playing;
  2284. this.playing = value;
  2285. // Start repainting if we weren't already
  2286. if( !wasPlaying && this.playing ) {
  2287. this.animate();
  2288. }
  2289. else {
  2290. this.render();
  2291. }
  2292. };
  2293. Playback.prototype.animate = function() {
  2294. var progressBefore = this.progress;
  2295. this.progress = this.progressCheck();
  2296. // When we loop, offset the progress so that it eases
  2297. // smoothly rather than immediately resetting
  2298. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  2299. this.progressOffset = this.progress;
  2300. }
  2301. this.render();
  2302. if( this.playing ) {
  2303. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  2304. }
  2305. };
  2306. /**
  2307. * Renders the current progress and playback state.
  2308. */
  2309. Playback.prototype.render = function() {
  2310. var progress = this.playing ? this.progress : 0,
  2311. radius = ( this.diameter / 2 ) - this.thickness,
  2312. x = this.diameter / 2,
  2313. y = this.diameter / 2,
  2314. iconSize = 14;
  2315. // Ease towards 1
  2316. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  2317. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  2318. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  2319. this.context.save();
  2320. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  2321. // Solid background color
  2322. this.context.beginPath();
  2323. this.context.arc( x, y, radius + 2, 0, Math.PI * 2, false );
  2324. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  2325. this.context.fill();
  2326. // Draw progress track
  2327. this.context.beginPath();
  2328. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  2329. this.context.lineWidth = this.thickness;
  2330. this.context.strokeStyle = '#666';
  2331. this.context.stroke();
  2332. if( this.playing ) {
  2333. // Draw progress on top of track
  2334. this.context.beginPath();
  2335. this.context.arc( x, y, radius, startAngle, endAngle, false );
  2336. this.context.lineWidth = this.thickness;
  2337. this.context.strokeStyle = '#fff';
  2338. this.context.stroke();
  2339. }
  2340. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  2341. // Draw play/pause icons
  2342. if( this.playing ) {
  2343. this.context.fillStyle = '#fff';
  2344. this.context.fillRect( 0, 0, iconSize / 2 - 2, iconSize );
  2345. this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize );
  2346. }
  2347. else {
  2348. this.context.beginPath();
  2349. this.context.translate( 2, 0 );
  2350. this.context.moveTo( 0, 0 );
  2351. this.context.lineTo( iconSize - 2, iconSize / 2 );
  2352. this.context.lineTo( 0, iconSize );
  2353. this.context.fillStyle = '#fff';
  2354. this.context.fill();
  2355. }
  2356. this.context.restore();
  2357. };
  2358. Playback.prototype.on = function( type, listener ) {
  2359. this.canvas.addEventListener( type, listener, false );
  2360. };
  2361. Playback.prototype.off = function( type, listener ) {
  2362. this.canvas.removeEventListener( type, listener, false );
  2363. };
  2364. Playback.prototype.destroy = function() {
  2365. this.playing = false;
  2366. if( this.canvas.parentNode ) {
  2367. this.container.removeChild( this.canvas );
  2368. }
  2369. };
  2370. // --------------------------------------------------------------------//
  2371. // ------------------------------- API --------------------------------//
  2372. // --------------------------------------------------------------------//
  2373. return {
  2374. initialize: initialize,
  2375. configure: configure,
  2376. sync: sync,
  2377. // Navigation methods
  2378. slide: slide,
  2379. left: navigateLeft,
  2380. right: navigateRight,
  2381. up: navigateUp,
  2382. down: navigateDown,
  2383. prev: navigatePrev,
  2384. next: navigateNext,
  2385. prevFragment: previousFragment,
  2386. nextFragment: nextFragment,
  2387. // Deprecated aliases
  2388. navigateTo: slide,
  2389. navigateLeft: navigateLeft,
  2390. navigateRight: navigateRight,
  2391. navigateUp: navigateUp,
  2392. navigateDown: navigateDown,
  2393. navigatePrev: navigatePrev,
  2394. navigateNext: navigateNext,
  2395. // Forces an update in slide layout
  2396. layout: layout,
  2397. // Returns an object with the available routes as booleans (left/right/top/bottom)
  2398. availableRoutes: availableRoutes,
  2399. // Returns an object with the available fragments as booleans (prev/next)
  2400. availableFragments: availableFragments,
  2401. // Toggles the overview mode on/off
  2402. toggleOverview: toggleOverview,
  2403. // Toggles the "black screen" mode on/off
  2404. togglePause: togglePause,
  2405. // State checks
  2406. isOverview: isOverview,
  2407. isPaused: isPaused,
  2408. // Adds or removes all internal event listeners (such as keyboard)
  2409. addEventListeners: addEventListeners,
  2410. removeEventListeners: removeEventListeners,
  2411. // Returns the indices of the current, or specified, slide
  2412. getIndices: getIndices,
  2413. // Returns the slide at the specified index, y is optional
  2414. getSlide: function( x, y ) {
  2415. var horizontalSlide = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2416. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2417. if( typeof y !== 'undefined' ) {
  2418. return verticalSlides ? verticalSlides[ y ] : undefined;
  2419. }
  2420. return horizontalSlide;
  2421. },
  2422. // Returns the previous slide element, may be null
  2423. getPreviousSlide: function() {
  2424. return previousSlide;
  2425. },
  2426. // Returns the current slide element
  2427. getCurrentSlide: function() {
  2428. return currentSlide;
  2429. },
  2430. // Returns the current scale of the presentation content
  2431. getScale: function() {
  2432. return scale;
  2433. },
  2434. // Returns the current configuration object
  2435. getConfig: function() {
  2436. return config;
  2437. },
  2438. // Helper method, retrieves query string as a key/value hash
  2439. getQueryHash: function() {
  2440. var query = {};
  2441. location.search.replace( /[A-Z0-9]+?=(\w*)/gi, function(a) {
  2442. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  2443. } );
  2444. // Basic deserialization
  2445. for( var i in query ) {
  2446. var value = query[ i ];
  2447. if( value === 'null' ) query[ i ] = null;
  2448. else if( value === 'true' ) query[ i ] = true;
  2449. else if( value === 'false' ) query[ i ] = false;
  2450. else if( !isNaN( parseFloat( value ) ) ) query[ i ] = parseFloat( value );
  2451. }
  2452. return query;
  2453. },
  2454. // Returns true if we're currently on the first slide
  2455. isFirstSlide: function() {
  2456. return document.querySelector( SLIDES_SELECTOR + '.past' ) == null ? true : false;
  2457. },
  2458. // Returns true if we're currently on the last slide
  2459. isLastSlide: function() {
  2460. if( currentSlide ) {
  2461. // Does this slide has next a sibling?
  2462. if( currentSlide.nextElementSibling ) return false;
  2463. // If it's vertical, does its parent have a next sibling?
  2464. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  2465. return true;
  2466. }
  2467. return false;
  2468. },
  2469. // Checks if reveal.js has been loaded and is ready for use
  2470. isReady: function() {
  2471. return loaded;
  2472. },
  2473. // Forward event binding to the reveal DOM element
  2474. addEventListener: function( type, listener, useCapture ) {
  2475. if( 'addEventListener' in window ) {
  2476. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  2477. }
  2478. },
  2479. removeEventListener: function( type, listener, useCapture ) {
  2480. if( 'addEventListener' in window ) {
  2481. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  2482. }
  2483. }
  2484. };
  2485. })();