reveal.js 76 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-child',
  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 centring 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. // Enable slide navigation via mouse wheel
  53. mouseWheel: false,
  54. // Apply a 3D roll to links on hover
  55. rollingLinks: false,
  56. // Hides the address bar on mobile devices
  57. hideAddressBar: true,
  58. // Opens links in an iframe preview overlay
  59. previewLinks: false,
  60. // Theme (see /css/theme)
  61. theme: null,
  62. // Transition style
  63. transition: 'default', // default/cube/page/concave/zoom/linear/fade/none
  64. // Transition speed
  65. transitionSpeed: 'default', // default/fast/slow
  66. // Transition style for full page slide backgrounds
  67. backgroundTransition: 'default', // default/linear/none
  68. // Parallax background image
  69. parallaxBackgroundImage: '', // CSS syntax, e.g. "url('a.jpg')"
  70. // Parallax background size
  71. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  72. // Number of slides away from the current that are visible
  73. viewDistance: 3,
  74. // Script dependencies to load
  75. dependencies: []
  76. },
  77. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  78. loaded = false,
  79. // The current auto-slide duration
  80. autoSlide = 0,
  81. // The horizontal and vertical index of the currently active slide
  82. indexh,
  83. indexv,
  84. // The previous and current slide HTML elements
  85. previousSlide,
  86. currentSlide,
  87. // Slides may hold a data-state attribute which we pick up and apply
  88. // as a class to the body. This list contains the combined state of
  89. // all current slides.
  90. state = [],
  91. // The current scale of the presentation (see width/height config)
  92. scale = 1,
  93. // Cached references to DOM elements
  94. dom = {},
  95. // Client support for CSS 3D transforms, see #checkCapabilities()
  96. supports3DTransforms,
  97. // Client support for CSS 2D transforms, see #checkCapabilities()
  98. supports2DTransforms,
  99. // Client is a mobile device, see #checkCapabilities()
  100. isMobileDevice,
  101. // Throttles mouse wheel navigation
  102. lastMouseWheelStep = 0,
  103. // An interval used to automatically move on to the next slide
  104. autoSlideTimeout = 0,
  105. // Delays updates to the URL due to a Chrome thumbnailer bug
  106. writeURLTimeout = 0,
  107. // A delay used to activate the overview mode
  108. activateOverviewTimeout = 0,
  109. // A delay used to deactivate the overview mode
  110. deactivateOverviewTimeout = 0,
  111. // Flags if the interaction event listeners are bound
  112. eventsAreBound = false,
  113. // Holds information about the currently ongoing touch input
  114. touch = {
  115. startX: 0,
  116. startY: 0,
  117. startSpan: 0,
  118. startCount: 0,
  119. captured: false,
  120. threshold: 40
  121. };
  122. /**
  123. * Starts up the presentation if the client is capable.
  124. */
  125. function initialize( options ) {
  126. checkCapabilities();
  127. if( !supports2DTransforms && !supports3DTransforms ) {
  128. document.body.setAttribute( 'class', 'no-transforms' );
  129. // If the browser doesn't support core features we won't be
  130. // using JavaScript to control the presentation
  131. return;
  132. }
  133. // Force a layout when the whole page, incl fonts, has loaded
  134. window.addEventListener( 'load', layout, false );
  135. // Copy options over to our config object
  136. extend( config, options );
  137. // Hide the address bar in mobile browsers
  138. hideAddressBar();
  139. // Loads the dependencies and continues to #start() once done
  140. load();
  141. }
  142. /**
  143. * Inspect the client to see what it's capable of, this
  144. * should only happens once per runtime.
  145. */
  146. function checkCapabilities() {
  147. supports3DTransforms = 'WebkitPerspective' in document.body.style ||
  148. 'MozPerspective' in document.body.style ||
  149. 'msPerspective' in document.body.style ||
  150. 'OPerspective' in document.body.style ||
  151. 'perspective' in document.body.style;
  152. supports2DTransforms = 'WebkitTransform' in document.body.style ||
  153. 'MozTransform' in document.body.style ||
  154. 'msTransform' in document.body.style ||
  155. 'OTransform' in document.body.style ||
  156. 'transform' in document.body.style;
  157. isMobileDevice = navigator.userAgent.match( /(iphone|ipod|android)/gi );
  158. }
  159. /**
  160. * Loads the dependencies of reveal.js. Dependencies are
  161. * defined via the configuration option 'dependencies'
  162. * and will be loaded prior to starting/binding reveal.js.
  163. * Some dependencies may have an 'async' flag, if so they
  164. * will load after reveal.js has been started up.
  165. */
  166. function load() {
  167. var scripts = [],
  168. scriptsAsync = [];
  169. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  170. var s = config.dependencies[i];
  171. // Load if there's no condition or the condition is truthy
  172. if( !s.condition || s.condition() ) {
  173. if( s.async ) {
  174. scriptsAsync.push( s.src );
  175. }
  176. else {
  177. scripts.push( s.src );
  178. }
  179. // Extension may contain callback functions
  180. if( typeof s.callback === 'function' ) {
  181. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], s.callback );
  182. }
  183. }
  184. }
  185. // Called once synchronous scripts finish loading
  186. function proceed() {
  187. if( scriptsAsync.length ) {
  188. // Load asynchronous scripts
  189. head.js.apply( null, scriptsAsync );
  190. }
  191. start();
  192. }
  193. if( scripts.length ) {
  194. head.ready( proceed );
  195. // Load synchronous scripts
  196. head.js.apply( null, scripts );
  197. }
  198. else {
  199. proceed();
  200. }
  201. }
  202. /**
  203. * Starts up reveal.js by binding input events and navigating
  204. * to the current URL deeplink if there is one.
  205. */
  206. function start() {
  207. // Make sure we've got all the DOM elements we need
  208. setupDOM();
  209. // Decorate the slide DOM elements with state classes (past/future)
  210. setupSlides();
  211. // Updates the presentation to match the current configuration values
  212. configure();
  213. // Read the initial hash
  214. readURL();
  215. // Notify listeners that the presentation is ready but use a 1ms
  216. // timeout to ensure it's not fired synchronously after #initialize()
  217. setTimeout( function() {
  218. // Enable transitions now that we're loaded
  219. dom.slides.classList.remove( 'no-transition' );
  220. loaded = true;
  221. dispatchEvent( 'ready', {
  222. 'indexh': indexh,
  223. 'indexv': indexv,
  224. 'currentSlide': currentSlide
  225. } );
  226. }, 1 );
  227. }
  228. /**
  229. * Iterates through and decorates slides DOM elements with
  230. * appropriate classes.
  231. */
  232. function setupSlides() {
  233. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  234. horizontalSlides.forEach( function( horizontalSlide ) {
  235. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  236. verticalSlides.forEach( function( verticalSlide, y ) {
  237. if( y > 0 ) verticalSlide.classList.add( 'future' );
  238. } );
  239. } );
  240. }
  241. /**
  242. * Finds and stores references to DOM elements which are
  243. * required by the presentation. If a required element is
  244. * not found, it is created.
  245. */
  246. function setupDOM() {
  247. // Cache references to key DOM elements
  248. dom.theme = document.querySelector( '#theme' );
  249. dom.wrapper = document.querySelector( '.reveal' );
  250. dom.slides = document.querySelector( '.reveal .slides' );
  251. // Prevent transitions while we're loading
  252. dom.slides.classList.add( 'no-transition' );
  253. // Background element
  254. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  255. // Progress bar
  256. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  257. dom.progressbar = dom.progress.querySelector( 'span' );
  258. // Arrow controls
  259. createSingletonNode( dom.wrapper, 'aside', 'controls',
  260. '<div class="navigate-left"></div>' +
  261. '<div class="navigate-right"></div>' +
  262. '<div class="navigate-up"></div>' +
  263. '<div class="navigate-down"></div>' );
  264. // State background element [DEPRECATED]
  265. createSingletonNode( dom.wrapper, 'div', 'state-background', null );
  266. // Overlay graphic which is displayed during the paused mode
  267. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  268. // Cache references to elements
  269. dom.controls = document.querySelector( '.reveal .controls' );
  270. // There can be multiple instances of controls throughout the page
  271. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  272. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  273. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  274. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  275. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  276. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  277. }
  278. /**
  279. * Creates an HTML element and returns a reference to it.
  280. * If the element already exists the existing instance will
  281. * be returned.
  282. */
  283. function createSingletonNode( container, tagname, classname, innerHTML ) {
  284. var node = container.querySelector( '.' + classname );
  285. if( !node ) {
  286. node = document.createElement( tagname );
  287. node.classList.add( classname );
  288. if( innerHTML !== null ) {
  289. node.innerHTML = innerHTML;
  290. }
  291. container.appendChild( node );
  292. }
  293. return node;
  294. }
  295. /**
  296. * Creates the slide background elements and appends them
  297. * to the background container. One element is created per
  298. * slide no matter if the given slide has visible background.
  299. */
  300. function createBackgrounds() {
  301. if( isPrintingPDF() ) {
  302. document.body.classList.add( 'print-pdf' );
  303. }
  304. // Clear prior backgrounds
  305. dom.background.innerHTML = '';
  306. dom.background.classList.add( 'no-transition' );
  307. // Helper method for creating a background element for the
  308. // given slide
  309. function _createBackground( slide, container ) {
  310. var data = {
  311. background: slide.getAttribute( 'data-background' ),
  312. backgroundSize: slide.getAttribute( 'data-background-size' ),
  313. backgroundImage: slide.getAttribute( 'data-background-image' ),
  314. backgroundColor: slide.getAttribute( 'data-background-color' ),
  315. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  316. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  317. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  318. };
  319. var element = document.createElement( 'div' );
  320. element.className = 'slide-background';
  321. if( data.background ) {
  322. // Auto-wrap image urls in url(...)
  323. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
  324. element.style.backgroundImage = 'url('+ data.background +')';
  325. }
  326. else {
  327. element.style.background = data.background;
  328. }
  329. }
  330. // Additional and optional background properties
  331. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  332. if( data.backgroundImage ) element.style.backgroundImage = 'url("' + data.backgroundImage + '")';
  333. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  334. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  335. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  336. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  337. container.appendChild( element );
  338. return element;
  339. }
  340. // Iterate over all horizontal slides
  341. toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  342. var backgroundStack;
  343. if( isPrintingPDF() ) {
  344. backgroundStack = _createBackground( slideh, slideh );
  345. }
  346. else {
  347. backgroundStack = _createBackground( slideh, dom.background );
  348. }
  349. // Iterate over all vertical slides
  350. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  351. if( isPrintingPDF() ) {
  352. _createBackground( slidev, slidev );
  353. }
  354. else {
  355. _createBackground( slidev, backgroundStack );
  356. }
  357. } );
  358. } );
  359. // Add parallax background if specified so
  360. var parallaxBackgroundImage = config.parallaxBackgroundImage,
  361. parallaxBackgroundSize = config.parallaxBackgroundSize;
  362. if (parallaxBackgroundImage) {
  363. dom.wrapper.style.background = parallaxBackgroundImage;
  364. dom.wrapper.style.backgroundSize = parallaxBackgroundSize;
  365. // Make sure the below properties are set on the element - these properties are
  366. // needed for proper transitions to be set on the element via CSS. To remove
  367. // annoying background slide-in effect when the presentation starts, apply
  368. // these properties after short time delay
  369. setTimeout( function() {
  370. dom.wrapper.setAttribute('data-parallax-background', parallaxBackgroundImage);
  371. dom.wrapper.setAttribute('data-parallax-background-size', parallaxBackgroundSize);
  372. }, 1 );
  373. }
  374. }
  375. /**
  376. * Applies the configuration settings from the config
  377. * object. May be called multiple times.
  378. */
  379. function configure( options ) {
  380. dom.wrapper.classList.remove( config.transition );
  381. // New config options may be passed when this method
  382. // is invoked through the API after initialization
  383. if( typeof options === 'object' ) extend( config, options );
  384. // Force linear transition based on browser capabilities
  385. if( supports3DTransforms === false ) config.transition = 'linear';
  386. dom.wrapper.classList.add( config.transition );
  387. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  388. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  389. dom.controls.style.display = config.controls ? 'block' : 'none';
  390. dom.progress.style.display = config.progress ? 'block' : 'none';
  391. if( config.rtl ) {
  392. dom.wrapper.classList.add( 'rtl' );
  393. }
  394. else {
  395. dom.wrapper.classList.remove( 'rtl' );
  396. }
  397. if( config.center ) {
  398. dom.wrapper.classList.add( 'center' );
  399. }
  400. else {
  401. dom.wrapper.classList.remove( 'center' );
  402. }
  403. if( config.mouseWheel ) {
  404. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  405. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  406. }
  407. else {
  408. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  409. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  410. }
  411. // Rolling 3D links
  412. if( config.rollingLinks ) {
  413. enableRollingLinks();
  414. }
  415. else {
  416. disableRollingLinks();
  417. }
  418. // Iframe link previews
  419. if( config.previewLinks ) {
  420. enablePreviewLinks();
  421. }
  422. else {
  423. disablePreviewLinks();
  424. enablePreviewLinks( '[data-preview-link]' );
  425. }
  426. // Load the theme in the config, if it's not already loaded
  427. if( config.theme && dom.theme ) {
  428. var themeURL = dom.theme.getAttribute( 'href' );
  429. var themeFinder = /[^\/]*?(?=\.css)/;
  430. var themeName = themeURL.match(themeFinder)[0];
  431. if( config.theme !== themeName ) {
  432. themeURL = themeURL.replace(themeFinder, config.theme);
  433. dom.theme.setAttribute( 'href', themeURL );
  434. }
  435. }
  436. sync();
  437. }
  438. /**
  439. * Binds all event listeners.
  440. */
  441. function addEventListeners() {
  442. eventsAreBound = true;
  443. window.addEventListener( 'hashchange', onWindowHashChange, false );
  444. window.addEventListener( 'resize', onWindowResize, false );
  445. if( config.touch ) {
  446. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  447. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  448. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  449. // Support pointer-style touch interaction as well
  450. if( window.navigator.msPointerEnabled ) {
  451. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  452. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  453. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  454. }
  455. }
  456. if( config.keyboard ) {
  457. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  458. }
  459. if ( config.progress && dom.progress ) {
  460. dom.progress.addEventListener( 'click', onProgressClicked, false );
  461. }
  462. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  463. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  464. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  465. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  466. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  467. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  468. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  469. } );
  470. }
  471. /**
  472. * Unbinds all event listeners.
  473. */
  474. function removeEventListeners() {
  475. eventsAreBound = false;
  476. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  477. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  478. window.removeEventListener( 'resize', onWindowResize, false );
  479. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  480. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  481. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  482. if( window.navigator.msPointerEnabled ) {
  483. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  484. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  485. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  486. }
  487. if ( config.progress && dom.progress ) {
  488. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  489. }
  490. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  491. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  492. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  493. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  494. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  495. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  496. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  497. } );
  498. }
  499. /**
  500. * Extend object a with the properties of object b.
  501. * If there's a conflict, object b takes precedence.
  502. */
  503. function extend( a, b ) {
  504. for( var i in b ) {
  505. a[ i ] = b[ i ];
  506. }
  507. }
  508. /**
  509. * Converts the target object to an array.
  510. */
  511. function toArray( o ) {
  512. return Array.prototype.slice.call( o );
  513. }
  514. /**
  515. * Measures the distance in pixels between point a
  516. * and point b.
  517. *
  518. * @param {Object} a point with x/y properties
  519. * @param {Object} b point with x/y properties
  520. */
  521. function distanceBetween( a, b ) {
  522. var dx = a.x - b.x,
  523. dy = a.y - b.y;
  524. return Math.sqrt( dx*dx + dy*dy );
  525. }
  526. /**
  527. * Applies a CSS transform to the target element.
  528. */
  529. function transformElement( element, transform ) {
  530. element.style.WebkitTransform = transform;
  531. element.style.MozTransform = transform;
  532. element.style.msTransform = transform;
  533. element.style.OTransform = transform;
  534. element.style.transform = transform;
  535. }
  536. /**
  537. * Retrieves the height of the given element by looking
  538. * at the position and height of its immediate children.
  539. */
  540. function getAbsoluteHeight( element ) {
  541. var height = 0;
  542. if( element ) {
  543. var absoluteChildren = 0;
  544. toArray( element.childNodes ).forEach( function( child ) {
  545. if( typeof child.offsetTop === 'number' && child.style ) {
  546. // Count # of abs children
  547. if( child.style.position === 'absolute' ) {
  548. absoluteChildren += 1;
  549. }
  550. height = Math.max( height, child.offsetTop + child.offsetHeight );
  551. }
  552. } );
  553. // If there are no absolute children, use offsetHeight
  554. if( absoluteChildren === 0 ) {
  555. height = element.offsetHeight;
  556. }
  557. }
  558. return height;
  559. }
  560. /**
  561. * Returns the remaining height within the parent of the
  562. * target element after subtracting the height of all
  563. * siblings.
  564. *
  565. * remaining height = [parent height] - [ siblings height]
  566. */
  567. function getRemainingHeight( element, height ) {
  568. height = height || 0;
  569. if( element ) {
  570. var parent = element.parentNode;
  571. var siblings = parent.childNodes;
  572. // Subtract the height of each sibling
  573. toArray( siblings ).forEach( function( sibling ) {
  574. if( typeof sibling.offsetHeight === 'number' && sibling !== element ) {
  575. var styles = window.getComputedStyle( sibling ),
  576. marginTop = parseInt( styles.marginTop, 10 ),
  577. marginBottom = parseInt( styles.marginBottom, 10 );
  578. height -= sibling.offsetHeight + marginTop + marginBottom;
  579. }
  580. } );
  581. var elementStyles = window.getComputedStyle( element );
  582. // Subtract the margins of the target element
  583. height -= parseInt( elementStyles.marginTop, 10 ) +
  584. parseInt( elementStyles.marginBottom, 10 );
  585. }
  586. return height;
  587. }
  588. /**
  589. * Checks if this instance is being used to print a PDF.
  590. */
  591. function isPrintingPDF() {
  592. return ( /print-pdf/gi ).test( window.location.search );
  593. }
  594. /**
  595. * Hides the address bar if we're on a mobile device.
  596. */
  597. function hideAddressBar() {
  598. if( config.hideAddressBar && isMobileDevice ) {
  599. // Events that should trigger the address bar to hide
  600. window.addEventListener( 'load', removeAddressBar, false );
  601. window.addEventListener( 'orientationchange', removeAddressBar, false );
  602. }
  603. }
  604. /**
  605. * Causes the address bar to hide on mobile devices,
  606. * more vertical space ftw.
  607. */
  608. function removeAddressBar() {
  609. // Portrait and not Chrome for iOS
  610. if( window.orientation === 0 && !/crios/gi.test( navigator.userAgent ) ) {
  611. document.documentElement.style.overflow = 'scroll';
  612. document.body.style.height = '120%';
  613. }
  614. else {
  615. document.documentElement.style.overflow = '';
  616. document.body.style.height = '100%';
  617. }
  618. setTimeout( function() {
  619. window.scrollTo( 0, 1 );
  620. }, 10 );
  621. }
  622. /**
  623. * Dispatches an event of the specified type from the
  624. * reveal DOM element.
  625. */
  626. function dispatchEvent( type, properties ) {
  627. var event = document.createEvent( "HTMLEvents", 1, 2 );
  628. event.initEvent( type, true, true );
  629. extend( event, properties );
  630. dom.wrapper.dispatchEvent( event );
  631. }
  632. /**
  633. * Wrap all links in 3D goodness.
  634. */
  635. function enableRollingLinks() {
  636. if( supports3DTransforms && !( 'msPerspective' in document.body.style ) ) {
  637. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a:not(.image)' );
  638. for( var i = 0, len = anchors.length; i < len; i++ ) {
  639. var anchor = anchors[i];
  640. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  641. var span = document.createElement('span');
  642. span.setAttribute('data-title', anchor.text);
  643. span.innerHTML = anchor.innerHTML;
  644. anchor.classList.add( 'roll' );
  645. anchor.innerHTML = '';
  646. anchor.appendChild(span);
  647. }
  648. }
  649. }
  650. }
  651. /**
  652. * Unwrap all 3D links.
  653. */
  654. function disableRollingLinks() {
  655. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  656. for( var i = 0, len = anchors.length; i < len; i++ ) {
  657. var anchor = anchors[i];
  658. var span = anchor.querySelector( 'span' );
  659. if( span ) {
  660. anchor.classList.remove( 'roll' );
  661. anchor.innerHTML = span.innerHTML;
  662. }
  663. }
  664. }
  665. /**
  666. * Bind preview frame links.
  667. */
  668. function enablePreviewLinks( selector ) {
  669. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  670. anchors.forEach( function( element ) {
  671. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  672. element.addEventListener( 'click', onPreviewLinkClicked, false );
  673. }
  674. } );
  675. }
  676. /**
  677. * Unbind preview frame links.
  678. */
  679. function disablePreviewLinks() {
  680. var anchors = toArray( document.querySelectorAll( 'a' ) );
  681. anchors.forEach( function( element ) {
  682. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  683. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  684. }
  685. } );
  686. }
  687. /**
  688. * Opens a preview window for the target URL.
  689. */
  690. function openPreview( url ) {
  691. closePreview();
  692. dom.preview = document.createElement( 'div' );
  693. dom.preview.classList.add( 'preview-link-overlay' );
  694. dom.wrapper.appendChild( dom.preview );
  695. dom.preview.innerHTML = [
  696. '<header>',
  697. '<a class="close" href="#"><span class="icon"></span></a>',
  698. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  699. '</header>',
  700. '<div class="spinner"></div>',
  701. '<div class="viewport">',
  702. '<iframe src="'+ url +'"></iframe>',
  703. '</div>'
  704. ].join('');
  705. dom.preview.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  706. dom.preview.classList.add( 'loaded' );
  707. }, false );
  708. dom.preview.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  709. closePreview();
  710. event.preventDefault();
  711. }, false );
  712. dom.preview.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  713. closePreview();
  714. }, false );
  715. setTimeout( function() {
  716. dom.preview.classList.add( 'visible' );
  717. }, 1 );
  718. }
  719. /**
  720. * Closes the iframe preview window.
  721. */
  722. function closePreview() {
  723. if( dom.preview ) {
  724. dom.preview.setAttribute( 'src', '' );
  725. dom.preview.parentNode.removeChild( dom.preview );
  726. dom.preview = null;
  727. }
  728. }
  729. /**
  730. * Return a sorted fragments list, ordered by an increasing
  731. * "data-fragment-index" attribute.
  732. *
  733. * Fragments will be revealed in the order that they are returned by
  734. * this function, so you can use the index attributes to control the
  735. * order of fragment appearance.
  736. *
  737. * To maintain a sensible default fragment order, fragments are presumed
  738. * to be passed in document order. This function adds a "fragment-index"
  739. * attribute to each node if such an attribute is not already present,
  740. * and sets that attribute to an integer value which is the position of
  741. * the fragment within the fragments list.
  742. */
  743. function sortFragments( fragments ) {
  744. var a = toArray( fragments );
  745. a.forEach( function( el, idx ) {
  746. if( !el.hasAttribute( 'data-fragment-index' ) ) {
  747. el.setAttribute( 'data-fragment-index', idx );
  748. }
  749. } );
  750. a.sort( function( l, r ) {
  751. return l.getAttribute( 'data-fragment-index' ) - r.getAttribute( 'data-fragment-index');
  752. } );
  753. return a;
  754. }
  755. /**
  756. * Applies JavaScript-controlled layout rules to the
  757. * presentation.
  758. */
  759. function layout() {
  760. if( dom.wrapper && !isPrintingPDF() ) {
  761. // Available space to scale within
  762. var availableWidth = dom.wrapper.offsetWidth,
  763. availableHeight = dom.wrapper.offsetHeight;
  764. // Reduce available space by margin
  765. availableWidth -= ( availableHeight * config.margin );
  766. availableHeight -= ( availableHeight * config.margin );
  767. // Dimensions of the content
  768. var slideWidth = config.width,
  769. slideHeight = config.height,
  770. slidePadding = 20; // TODO Dig this out of DOM
  771. // Layout the contents of the slides
  772. layoutSlideContents( config.width, config.height, slidePadding );
  773. // Slide width may be a percentage of available width
  774. if( typeof slideWidth === 'string' && /%$/.test( slideWidth ) ) {
  775. slideWidth = parseInt( slideWidth, 10 ) / 100 * availableWidth;
  776. }
  777. // Slide height may be a percentage of available height
  778. if( typeof slideHeight === 'string' && /%$/.test( slideHeight ) ) {
  779. slideHeight = parseInt( slideHeight, 10 ) / 100 * availableHeight;
  780. }
  781. dom.slides.style.width = slideWidth + 'px';
  782. dom.slides.style.height = slideHeight + 'px';
  783. // Determine scale of content to fit within available space
  784. scale = Math.min( availableWidth / slideWidth, availableHeight / slideHeight );
  785. // Respect max/min scale settings
  786. scale = Math.max( scale, config.minScale );
  787. scale = Math.min( scale, config.maxScale );
  788. // Prefer applying scale via zoom since Chrome blurs scaled content
  789. // with nested transforms
  790. if( typeof dom.slides.style.zoom !== 'undefined' && !navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi ) ) {
  791. dom.slides.style.zoom = scale;
  792. }
  793. // Apply scale transform as a fallback
  794. else {
  795. transformElement( dom.slides, 'translate(-50%, -50%) scale('+ scale +') translate(50%, 50%)' );
  796. }
  797. // Select all slides, vertical and horizontal
  798. var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
  799. for( var i = 0, len = slides.length; i < len; i++ ) {
  800. var slide = slides[ i ];
  801. // Don't bother updating invisible slides
  802. if( slide.style.display === 'none' ) {
  803. continue;
  804. }
  805. if( config.center ) {
  806. // Vertical stacks are not centred since their section
  807. // children will be
  808. if( slide.classList.contains( 'stack' ) ) {
  809. slide.style.top = 0;
  810. }
  811. else {
  812. slide.style.top = Math.max( - ( getAbsoluteHeight( slide ) / 2 ) - slidePadding, -slideHeight / 2 ) + 'px';
  813. }
  814. }
  815. else {
  816. slide.style.top = '';
  817. }
  818. }
  819. updateProgress();
  820. }
  821. }
  822. /**
  823. * Applies layout logic to the contents of all slides in
  824. * the presentation.
  825. */
  826. function layoutSlideContents( width, height, padding ) {
  827. // Handle sizing of elements with the 'stretch' class
  828. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  829. // Determine how much vertical space we can use
  830. var remainingHeight = getRemainingHeight( element, ( height - ( padding * 2 ) ) );
  831. // Consider the aspect ratio of media elements
  832. if( /(img|video)/gi.test( element.nodeName ) ) {
  833. var nw = element.naturalWidth || element.videoWidth,
  834. nh = element.naturalHeight || element.videoHeight;
  835. var es = Math.min( width / nw, remainingHeight / nh );
  836. element.style.width = ( nw * es ) + 'px';
  837. element.style.height = ( nh * es ) + 'px';
  838. }
  839. else {
  840. element.style.width = width + 'px';
  841. element.style.height = remainingHeight + 'px';
  842. }
  843. } );
  844. }
  845. /**
  846. * Stores the vertical index of a stack so that the same
  847. * vertical slide can be selected when navigating to and
  848. * from the stack.
  849. *
  850. * @param {HTMLElement} stack The vertical stack element
  851. * @param {int} v Index to memorize
  852. */
  853. function setPreviousVerticalIndex( stack, v ) {
  854. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  855. stack.setAttribute( 'data-previous-indexv', v || 0 );
  856. }
  857. }
  858. /**
  859. * Retrieves the vertical index which was stored using
  860. * #setPreviousVerticalIndex() or 0 if no previous index
  861. * exists.
  862. *
  863. * @param {HTMLElement} stack The vertical stack element
  864. */
  865. function getPreviousVerticalIndex( stack ) {
  866. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  867. // Prefer manually defined start-indexv
  868. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  869. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  870. }
  871. return 0;
  872. }
  873. /**
  874. * Displays the overview of slides (quick nav) by
  875. * scaling down and arranging all slide elements.
  876. *
  877. * Experimental feature, might be dropped if perf
  878. * can't be improved.
  879. */
  880. function activateOverview() {
  881. // Only proceed if enabled in config
  882. if( config.overview ) {
  883. // Don't auto-slide while in overview mode
  884. cancelAutoSlide();
  885. var wasActive = dom.wrapper.classList.contains( 'overview' );
  886. // Vary the depth of the overview based on screen size
  887. var depth = window.innerWidth < 400 ? 1000 : 2500;
  888. dom.wrapper.classList.add( 'overview' );
  889. dom.wrapper.classList.remove( 'overview-deactivating' );
  890. clearTimeout( activateOverviewTimeout );
  891. clearTimeout( deactivateOverviewTimeout );
  892. // Not the pretties solution, but need to let the overview
  893. // class apply first so that slides are measured accurately
  894. // before we can position them
  895. activateOverviewTimeout = setTimeout( function() {
  896. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  897. for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
  898. var hslide = horizontalSlides[i],
  899. hoffset = config.rtl ? -105 : 105;
  900. hslide.setAttribute( 'data-index-h', i );
  901. // Apply CSS transform
  902. transformElement( hslide, 'translateZ(-'+ depth +'px) translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)' );
  903. if( hslide.classList.contains( 'stack' ) ) {
  904. var verticalSlides = hslide.querySelectorAll( 'section' );
  905. for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
  906. var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );
  907. var vslide = verticalSlides[j];
  908. vslide.setAttribute( 'data-index-h', i );
  909. vslide.setAttribute( 'data-index-v', j );
  910. // Apply CSS transform
  911. transformElement( vslide, 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)' );
  912. // Navigate to this slide on click
  913. vslide.addEventListener( 'click', onOverviewSlideClicked, true );
  914. }
  915. }
  916. else {
  917. // Navigate to this slide on click
  918. hslide.addEventListener( 'click', onOverviewSlideClicked, true );
  919. }
  920. }
  921. updateSlidesVisibility();
  922. layout();
  923. if( !wasActive ) {
  924. // Notify observers of the overview showing
  925. dispatchEvent( 'overviewshown', {
  926. 'indexh': indexh,
  927. 'indexv': indexv,
  928. 'currentSlide': currentSlide
  929. } );
  930. }
  931. }, 10 );
  932. }
  933. }
  934. /**
  935. * Exits the slide overview and enters the currently
  936. * active slide.
  937. */
  938. function deactivateOverview() {
  939. // Only proceed if enabled in config
  940. if( config.overview ) {
  941. clearTimeout( activateOverviewTimeout );
  942. clearTimeout( deactivateOverviewTimeout );
  943. dom.wrapper.classList.remove( 'overview' );
  944. // Temporarily add a class so that transitions can do different things
  945. // depending on whether they are exiting/entering overview, or just
  946. // moving from slide to slide
  947. dom.wrapper.classList.add( 'overview-deactivating' );
  948. deactivateOverviewTimeout = setTimeout( function () {
  949. dom.wrapper.classList.remove( 'overview-deactivating' );
  950. }, 1 );
  951. // Select all slides
  952. toArray( document.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  953. // Resets all transforms to use the external styles
  954. transformElement( slide, '' );
  955. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  956. } );
  957. slide( indexh, indexv );
  958. cueAutoSlide();
  959. // Notify observers of the overview hiding
  960. dispatchEvent( 'overviewhidden', {
  961. 'indexh': indexh,
  962. 'indexv': indexv,
  963. 'currentSlide': currentSlide
  964. } );
  965. }
  966. }
  967. /**
  968. * Toggles the slide overview mode on and off.
  969. *
  970. * @param {Boolean} override Optional flag which overrides the
  971. * toggle logic and forcibly sets the desired state. True means
  972. * overview is open, false means it's closed.
  973. */
  974. function toggleOverview( override ) {
  975. if( typeof override === 'boolean' ) {
  976. override ? activateOverview() : deactivateOverview();
  977. }
  978. else {
  979. isOverview() ? deactivateOverview() : activateOverview();
  980. }
  981. }
  982. /**
  983. * Checks if the overview is currently active.
  984. *
  985. * @return {Boolean} true if the overview is active,
  986. * false otherwise
  987. */
  988. function isOverview() {
  989. return dom.wrapper.classList.contains( 'overview' );
  990. }
  991. /**
  992. * Checks if the current or specified slide is vertical
  993. * (nested within another slide).
  994. *
  995. * @param {HTMLElement} slide [optional] The slide to check
  996. * orientation of
  997. */
  998. function isVerticalSlide( slide ) {
  999. // Prefer slide argument, otherwise use current slide
  1000. slide = slide ? slide : currentSlide;
  1001. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1002. }
  1003. /**
  1004. * Handling the fullscreen functionality via the fullscreen API
  1005. *
  1006. * @see http://fullscreen.spec.whatwg.org/
  1007. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1008. */
  1009. function enterFullscreen() {
  1010. var element = document.body;
  1011. // Check which implementation is available
  1012. var requestMethod = element.requestFullScreen ||
  1013. element.webkitRequestFullscreen ||
  1014. element.webkitRequestFullScreen ||
  1015. element.mozRequestFullScreen ||
  1016. element.msRequestFullScreen;
  1017. if( requestMethod ) {
  1018. requestMethod.apply( element );
  1019. }
  1020. }
  1021. /**
  1022. * Enters the paused mode which fades everything on screen to
  1023. * black.
  1024. */
  1025. function pause() {
  1026. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1027. cancelAutoSlide();
  1028. dom.wrapper.classList.add( 'paused' );
  1029. if( wasPaused === false ) {
  1030. dispatchEvent( 'paused' );
  1031. }
  1032. }
  1033. /**
  1034. * Exits from the paused mode.
  1035. */
  1036. function resume() {
  1037. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1038. dom.wrapper.classList.remove( 'paused' );
  1039. cueAutoSlide();
  1040. if( wasPaused ) {
  1041. dispatchEvent( 'resumed' );
  1042. }
  1043. }
  1044. /**
  1045. * Toggles the paused mode on and off.
  1046. */
  1047. function togglePause() {
  1048. if( isPaused() ) {
  1049. resume();
  1050. }
  1051. else {
  1052. pause();
  1053. }
  1054. }
  1055. /**
  1056. * Checks if we are currently in the paused mode.
  1057. */
  1058. function isPaused() {
  1059. return dom.wrapper.classList.contains( 'paused' );
  1060. }
  1061. /**
  1062. * Steps from the current point in the presentation to the
  1063. * slide which matches the specified horizontal and vertical
  1064. * indices.
  1065. *
  1066. * @param {int} h Horizontal index of the target slide
  1067. * @param {int} v Vertical index of the target slide
  1068. * @param {int} f Optional index of a fragment within the
  1069. * target slide to activate
  1070. * @param {int} o Optional origin for use in multimaster environments
  1071. */
  1072. function slide( h, v, f, o ) {
  1073. // Remember where we were at before
  1074. previousSlide = currentSlide;
  1075. // Query all horizontal slides in the deck
  1076. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1077. // If no vertical index is specified and the upcoming slide is a
  1078. // stack, resume at its previous vertical index
  1079. if( v === undefined ) {
  1080. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1081. }
  1082. // If we were on a vertical stack, remember what vertical index
  1083. // it was on so we can resume at the same position when returning
  1084. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1085. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1086. }
  1087. // Remember the state before this slide
  1088. var stateBefore = state.concat();
  1089. // Reset the state array
  1090. state.length = 0;
  1091. var indexhBefore = indexh || 0,
  1092. indexvBefore = indexv || 0;
  1093. // Activate and transition to the new slide
  1094. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1095. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1096. // Update the visibility of slides now that the indices have changed
  1097. updateSlidesVisibility();
  1098. layout();
  1099. // Apply the new state
  1100. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1101. // Check if this state existed on the previous slide. If it
  1102. // did, we will avoid adding it repeatedly
  1103. for( var j = 0; j < stateBefore.length; j++ ) {
  1104. if( stateBefore[j] === state[i] ) {
  1105. stateBefore.splice( j, 1 );
  1106. continue stateLoop;
  1107. }
  1108. }
  1109. document.documentElement.classList.add( state[i] );
  1110. // Dispatch custom event matching the state's name
  1111. dispatchEvent( state[i] );
  1112. }
  1113. // Clean up the remains of the previous state
  1114. while( stateBefore.length ) {
  1115. document.documentElement.classList.remove( stateBefore.pop() );
  1116. }
  1117. // If the overview is active, re-activate it to update positions
  1118. if( isOverview() ) {
  1119. activateOverview();
  1120. }
  1121. // Find the current horizontal slide and any possible vertical slides
  1122. // within it
  1123. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1124. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1125. // Store references to the previous and current slides
  1126. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1127. // Animate parallax background
  1128. if (dom.wrapper.getAttribute('data-parallax-background') || config.parallaxBackgroundImage) {
  1129. var bs = dom.wrapper.style.backgroundSize.split(' '),
  1130. bgWidth, bgHeight;
  1131. if (bs.length === 1) {
  1132. bgWidth = bgHeight = parseInt(bs[0], 10);
  1133. } else {
  1134. bgWidth = parseInt(bs[0], 10);
  1135. bgHeight = parseInt(bs[1], 10);
  1136. }
  1137. var slideWidth = parseInt(dom.wrapper.offsetWidth, 10);
  1138. var horizontalSlideCount = horizontalSlides.length;
  1139. var horizontalOffset = -(bgWidth - slideWidth)/(horizontalSlideCount-1) * h;
  1140. var slideHeight = parseInt(dom.wrapper.offsetHeight, 10);
  1141. var verticalSlideCount = currentVerticalSlides.length;
  1142. var verticalOffset = verticalSlideCount > 0 ? -(bgHeight - slideHeight)/(verticalSlideCount-1) * v : 0;
  1143. dom.wrapper.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
  1144. }
  1145. ////////////////////////////////////
  1146. // Show fragment, if specified
  1147. if( typeof f !== 'undefined' ) {
  1148. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  1149. toArray( fragments ).forEach( function( fragment, indexf ) {
  1150. if( indexf < f ) {
  1151. fragment.classList.add( 'visible' );
  1152. }
  1153. else {
  1154. fragment.classList.remove( 'visible' );
  1155. }
  1156. } );
  1157. }
  1158. // Dispatch an event if the slide changed
  1159. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1160. if( slideChanged ) {
  1161. dispatchEvent( 'slidechanged', {
  1162. 'indexh': indexh,
  1163. 'indexv': indexv,
  1164. 'previousSlide': previousSlide,
  1165. 'currentSlide': currentSlide,
  1166. 'origin': o
  1167. } );
  1168. }
  1169. else {
  1170. // Ensure that the previous slide is never the same as the current
  1171. previousSlide = null;
  1172. }
  1173. // Solves an edge case where the previous slide maintains the
  1174. // 'present' class when navigating between adjacent vertical
  1175. // stacks
  1176. if( previousSlide ) {
  1177. previousSlide.classList.remove( 'present' );
  1178. // Reset all slides upon navigate to home
  1179. // Issue: #285
  1180. if ( document.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1181. // Launch async task
  1182. setTimeout( function () {
  1183. var slides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1184. for( i in slides ) {
  1185. if( slides[i] ) {
  1186. // Reset stack
  1187. setPreviousVerticalIndex( slides[i], 0 );
  1188. }
  1189. }
  1190. }, 0 );
  1191. }
  1192. }
  1193. // Handle embedded content
  1194. if( slideChanged ) {
  1195. stopEmbeddedContent( previousSlide );
  1196. startEmbeddedContent( currentSlide );
  1197. }
  1198. updateControls();
  1199. updateProgress();
  1200. updateBackground();
  1201. // Update the URL hash
  1202. writeURL();
  1203. }
  1204. /**
  1205. * Syncs the presentation with the current DOM. Useful
  1206. * when new slides or control elements are added or when
  1207. * the configuration has changed.
  1208. */
  1209. function sync() {
  1210. // Subscribe to input
  1211. removeEventListeners();
  1212. addEventListeners();
  1213. // Force a layout to make sure the current config is accounted for
  1214. layout();
  1215. // Reflect the current autoSlide value
  1216. autoSlide = config.autoSlide;
  1217. // Start auto-sliding if it's enabled
  1218. cueAutoSlide();
  1219. // Re-create the slide backgrounds
  1220. createBackgrounds();
  1221. updateControls();
  1222. updateProgress();
  1223. updateBackground();
  1224. }
  1225. /**
  1226. * Updates one dimension of slides by showing the slide
  1227. * with the specified index.
  1228. *
  1229. * @param {String} selector A CSS selector that will fetch
  1230. * the group of slides we are working with
  1231. * @param {Number} index The index of the slide that should be
  1232. * shown
  1233. *
  1234. * @return {Number} The index of the slide that is now shown,
  1235. * might differ from the passed in index if it was out of
  1236. * bounds.
  1237. */
  1238. function updateSlides( selector, index ) {
  1239. // Select all slides and convert the NodeList result to
  1240. // an array
  1241. var slides = toArray( document.querySelectorAll( selector ) ),
  1242. slidesLength = slides.length;
  1243. if( slidesLength ) {
  1244. // Should the index loop?
  1245. if( config.loop ) {
  1246. index %= slidesLength;
  1247. if( index < 0 ) {
  1248. index = slidesLength + index;
  1249. }
  1250. }
  1251. // Enforce max and minimum index bounds
  1252. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1253. for( var i = 0; i < slidesLength; i++ ) {
  1254. var element = slides[i];
  1255. var reverse = config.rtl && !isVerticalSlide( element );
  1256. element.classList.remove( 'past' );
  1257. element.classList.remove( 'present' );
  1258. element.classList.remove( 'future' );
  1259. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1260. element.setAttribute( 'hidden', '' );
  1261. if( i < index ) {
  1262. // Any element previous to index is given the 'past' class
  1263. element.classList.add( reverse ? 'future' : 'past' );
  1264. }
  1265. else if( i > index ) {
  1266. // Any element subsequent to index is given the 'future' class
  1267. element.classList.add( reverse ? 'past' : 'future' );
  1268. var fragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1269. // No fragments in future slides should be visible ahead of time
  1270. while( fragments.length ) {
  1271. fragments.pop().classList.remove( 'visible' );
  1272. }
  1273. }
  1274. // If this element contains vertical slides
  1275. if( element.querySelector( 'section' ) ) {
  1276. element.classList.add( 'stack' );
  1277. }
  1278. }
  1279. // Mark the current slide as present
  1280. slides[index].classList.add( 'present' );
  1281. slides[index].removeAttribute( 'hidden' );
  1282. // If this slide has a state associated with it, add it
  1283. // onto the current state of the deck
  1284. var slideState = slides[index].getAttribute( 'data-state' );
  1285. if( slideState ) {
  1286. state = state.concat( slideState.split( ' ' ) );
  1287. }
  1288. // If this slide has a data-autoslide attribute associated use this as
  1289. // autoSlide value otherwise use the global configured time
  1290. var slideAutoSlide = slides[index].getAttribute( 'data-autoslide' );
  1291. if( slideAutoSlide ) {
  1292. autoSlide = parseInt( slideAutoSlide, 10 );
  1293. }
  1294. else {
  1295. autoSlide = config.autoSlide;
  1296. }
  1297. cueAutoSlide();
  1298. }
  1299. else {
  1300. // Since there are no slides we can't be anywhere beyond the
  1301. // zeroth index
  1302. index = 0;
  1303. }
  1304. return index;
  1305. }
  1306. /**
  1307. * Optimization method; hide all slides that are far away
  1308. * from the present slide.
  1309. */
  1310. function updateSlidesVisibility() {
  1311. // Select all slides and convert the NodeList result to
  1312. // an array
  1313. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1314. horizontalSlidesLength = horizontalSlides.length,
  1315. distanceX,
  1316. distanceY;
  1317. if( horizontalSlidesLength ) {
  1318. // The number of steps away from the present slide that will
  1319. // be visible
  1320. var viewDistance = isOverview() ? 10 : config.viewDistance;
  1321. // Limit view distance on weaker devices
  1322. if( isMobileDevice ) {
  1323. viewDistance = isOverview() ? 6 : 1;
  1324. }
  1325. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1326. var horizontalSlide = horizontalSlides[x];
  1327. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1328. verticalSlidesLength = verticalSlides.length;
  1329. // Loops so that it measures 1 between the first and last slides
  1330. distanceX = Math.abs( ( indexh - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1331. // Show the horizontal slide if it's within the view distance
  1332. horizontalSlide.style.display = distanceX > viewDistance ? 'none' : 'block';
  1333. if( verticalSlidesLength ) {
  1334. var oy = getPreviousVerticalIndex( horizontalSlide );
  1335. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1336. var verticalSlide = verticalSlides[y];
  1337. distanceY = x === indexh ? Math.abs( indexv - y ) : Math.abs( y - oy );
  1338. verticalSlide.style.display = ( distanceX + distanceY ) > viewDistance ? 'none' : 'block';
  1339. }
  1340. }
  1341. }
  1342. }
  1343. }
  1344. /**
  1345. * Updates the progress bar to reflect the current slide.
  1346. */
  1347. function updateProgress() {
  1348. // Update progress if enabled
  1349. if( config.progress && dom.progress ) {
  1350. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1351. // The number of past and total slides
  1352. var totalCount = document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  1353. var pastCount = 0;
  1354. // Step through all slides and count the past ones
  1355. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  1356. var horizontalSlide = horizontalSlides[i];
  1357. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1358. for( var j = 0; j < verticalSlides.length; j++ ) {
  1359. // Stop as soon as we arrive at the present
  1360. if( verticalSlides[j].classList.contains( 'present' ) ) {
  1361. break mainLoop;
  1362. }
  1363. pastCount++;
  1364. }
  1365. // Stop as soon as we arrive at the present
  1366. if( horizontalSlide.classList.contains( 'present' ) ) {
  1367. break;
  1368. }
  1369. // Don't count the wrapping section for vertical slides
  1370. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  1371. pastCount++;
  1372. }
  1373. }
  1374. dom.progressbar.style.width = ( pastCount / ( totalCount - 1 ) ) * window.innerWidth + 'px';
  1375. }
  1376. }
  1377. /**
  1378. * Updates the state of all control/navigation arrows.
  1379. */
  1380. function updateControls() {
  1381. var routes = availableRoutes();
  1382. var fragments = availableFragments();
  1383. // Remove the 'enabled' class from all directions
  1384. dom.controlsLeft.concat( dom.controlsRight )
  1385. .concat( dom.controlsUp )
  1386. .concat( dom.controlsDown )
  1387. .concat( dom.controlsPrev )
  1388. .concat( dom.controlsNext ).forEach( function( node ) {
  1389. node.classList.remove( 'enabled' );
  1390. node.classList.remove( 'fragmented' );
  1391. } );
  1392. // Add the 'enabled' class to the available routes
  1393. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1394. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1395. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1396. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1397. // Prev/next buttons
  1398. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1399. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1400. // Highlight fragment directions
  1401. if( currentSlide ) {
  1402. // Always apply fragment decorator to prev/next buttons
  1403. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1404. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1405. // Apply fragment decorators to directional buttons based on
  1406. // what slide axis they are in
  1407. if( isVerticalSlide( currentSlide ) ) {
  1408. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1409. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1410. }
  1411. else {
  1412. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1413. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1414. }
  1415. }
  1416. }
  1417. /**
  1418. * Updates the background elements to reflect the current
  1419. * slide.
  1420. */
  1421. function updateBackground() {
  1422. // Update the classes of all backgrounds to match the
  1423. // states of their slides (past/present/future)
  1424. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  1425. // Reverse past/future classes when in RTL mode
  1426. var horizontalPast = config.rtl ? 'future' : 'past',
  1427. horizontalFuture = config.rtl ? 'past' : 'future';
  1428. backgroundh.className = 'slide-background ' + ( h < indexh ? horizontalPast : h > indexh ? horizontalFuture : 'present' );
  1429. toArray( backgroundh.childNodes ).forEach( function( backgroundv, v ) {
  1430. backgroundv.className = 'slide-background ' + ( v < indexv ? 'past' : v > indexv ? 'future' : 'present' );
  1431. } );
  1432. } );
  1433. // Allow the first background to apply without transition
  1434. setTimeout( function() {
  1435. dom.background.classList.remove( 'no-transition' );
  1436. }, 1 );
  1437. }
  1438. /**
  1439. * Determine what available routes there are for navigation.
  1440. *
  1441. * @return {Object} containing four booleans: left/right/up/down
  1442. */
  1443. function availableRoutes() {
  1444. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1445. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1446. var routes = {
  1447. left: indexh > 0 || config.loop,
  1448. right: indexh < horizontalSlides.length - 1 || config.loop,
  1449. up: indexv > 0,
  1450. down: indexv < verticalSlides.length - 1
  1451. };
  1452. // reverse horizontal controls for rtl
  1453. if( config.rtl ) {
  1454. var left = routes.left;
  1455. routes.left = routes.right;
  1456. routes.right = left;
  1457. }
  1458. return routes;
  1459. }
  1460. /**
  1461. * Returns an object describing the available fragment
  1462. * directions.
  1463. *
  1464. * @return {Object} two boolean properties: prev/next
  1465. */
  1466. function availableFragments() {
  1467. if( currentSlide && config.fragments ) {
  1468. var fragments = currentSlide.querySelectorAll( '.fragment' );
  1469. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  1470. return {
  1471. prev: fragments.length - hiddenFragments.length > 0,
  1472. next: !!hiddenFragments.length
  1473. };
  1474. }
  1475. else {
  1476. return { prev: false, next: false };
  1477. }
  1478. }
  1479. /**
  1480. * Start playback of any embedded content inside of
  1481. * the targeted slide.
  1482. */
  1483. function startEmbeddedContent( slide ) {
  1484. if( slide ) {
  1485. // HTML5 media elements
  1486. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1487. if( el.hasAttribute( 'data-autoplay' ) ) {
  1488. el.play();
  1489. }
  1490. } );
  1491. // YouTube embeds
  1492. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1493. if( el.hasAttribute( 'data-autoplay' ) ) {
  1494. el.contentWindow.postMessage('{"event":"command","func":"playVideo","args":""}', '*');
  1495. }
  1496. });
  1497. }
  1498. }
  1499. /**
  1500. * Stop playback of any embedded content inside of
  1501. * the targeted slide.
  1502. */
  1503. function stopEmbeddedContent( slide ) {
  1504. if( slide ) {
  1505. // HTML5 media elements
  1506. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1507. if( !el.hasAttribute( 'data-ignore' ) ) {
  1508. el.pause();
  1509. }
  1510. } );
  1511. // YouTube embeds
  1512. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1513. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  1514. el.contentWindow.postMessage('{"event":"command","func":"pauseVideo","args":""}', '*');
  1515. }
  1516. });
  1517. }
  1518. }
  1519. /**
  1520. * Reads the current URL (hash) and navigates accordingly.
  1521. */
  1522. function readURL() {
  1523. var hash = window.location.hash;
  1524. // Attempt to parse the hash as either an index or name
  1525. var bits = hash.slice( 2 ).split( '/' ),
  1526. name = hash.replace( /#|\//gi, '' );
  1527. // If the first bit is invalid and there is a name we can
  1528. // assume that this is a named link
  1529. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  1530. // Find the slide with the specified name
  1531. var element = document.querySelector( '#' + name );
  1532. if( element ) {
  1533. // Find the position of the named slide and navigate to it
  1534. var indices = Reveal.getIndices( element );
  1535. slide( indices.h, indices.v );
  1536. }
  1537. // If the slide doesn't exist, navigate to the current slide
  1538. else {
  1539. slide( indexh || 0, indexv || 0 );
  1540. }
  1541. }
  1542. else {
  1543. // Read the index components of the hash
  1544. var h = parseInt( bits[0], 10 ) || 0,
  1545. v = parseInt( bits[1], 10 ) || 0;
  1546. if( h !== indexh || v !== indexv ) {
  1547. slide( h, v );
  1548. }
  1549. }
  1550. }
  1551. /**
  1552. * Updates the page URL (hash) to reflect the current
  1553. * state.
  1554. *
  1555. * @param {Number} delay The time in ms to wait before
  1556. * writing the hash
  1557. */
  1558. function writeURL( delay ) {
  1559. if( config.history ) {
  1560. // Make sure there's never more than one timeout running
  1561. clearTimeout( writeURLTimeout );
  1562. // If a delay is specified, timeout this call
  1563. if( typeof delay === 'number' ) {
  1564. writeURLTimeout = setTimeout( writeURL, delay );
  1565. }
  1566. else {
  1567. var url = '/';
  1568. // If the current slide has an ID, use that as a named link
  1569. if( currentSlide && typeof currentSlide.getAttribute( 'id' ) === 'string' ) {
  1570. url = '/' + currentSlide.getAttribute( 'id' );
  1571. }
  1572. // Otherwise use the /h/v index
  1573. else {
  1574. if( indexh > 0 || indexv > 0 ) url += indexh;
  1575. if( indexv > 0 ) url += '/' + indexv;
  1576. }
  1577. window.location.hash = url;
  1578. }
  1579. }
  1580. }
  1581. /**
  1582. * Retrieves the h/v location of the current, or specified,
  1583. * slide.
  1584. *
  1585. * @param {HTMLElement} slide If specified, the returned
  1586. * index will be for this slide rather than the currently
  1587. * active one
  1588. *
  1589. * @return {Object} { h: <int>, v: <int>, f: <int> }
  1590. */
  1591. function getIndices( slide ) {
  1592. // By default, return the current indices
  1593. var h = indexh,
  1594. v = indexv,
  1595. f;
  1596. // If a slide is specified, return the indices of that slide
  1597. if( slide ) {
  1598. var isVertical = isVerticalSlide( slide );
  1599. var slideh = isVertical ? slide.parentNode : slide;
  1600. // Select all horizontal slides
  1601. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1602. // Now that we know which the horizontal slide is, get its index
  1603. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  1604. // If this is a vertical slide, grab the vertical index
  1605. if( isVertical ) {
  1606. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  1607. }
  1608. }
  1609. if( !slide && currentSlide ) {
  1610. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  1611. if( hasFragments ) {
  1612. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  1613. f = visibleFragments.length;
  1614. }
  1615. }
  1616. return { h: h, v: v, f: f };
  1617. }
  1618. /**
  1619. * Navigate to the next slide fragment.
  1620. *
  1621. * @return {Boolean} true if there was a next fragment,
  1622. * false otherwise
  1623. */
  1624. function nextFragment() {
  1625. if( currentSlide && config.fragments ) {
  1626. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment:not(.visible)' ) );
  1627. if( fragments.length ) {
  1628. // Find the index of the next fragment
  1629. var index = fragments[0].getAttribute( 'data-fragment-index' );
  1630. // Find all fragments with the same index
  1631. fragments = currentSlide.querySelectorAll( '.fragment[data-fragment-index="'+ index +'"]' );
  1632. toArray( fragments ).forEach( function( element ) {
  1633. element.classList.add( 'visible' );
  1634. } );
  1635. // Notify subscribers of the change
  1636. dispatchEvent( 'fragmentshown', { fragment: fragments[0], fragments: fragments } );
  1637. updateControls();
  1638. return true;
  1639. }
  1640. }
  1641. return false;
  1642. }
  1643. /**
  1644. * Navigate to the previous slide fragment.
  1645. *
  1646. * @return {Boolean} true if there was a previous fragment,
  1647. * false otherwise
  1648. */
  1649. function previousFragment() {
  1650. if( currentSlide && config.fragments ) {
  1651. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) );
  1652. if( fragments.length ) {
  1653. // Find the index of the previous fragment
  1654. var index = fragments[ fragments.length - 1 ].getAttribute( 'data-fragment-index' );
  1655. // Find all fragments with the same index
  1656. fragments = currentSlide.querySelectorAll( '.fragment[data-fragment-index="'+ index +'"]' );
  1657. toArray( fragments ).forEach( function( f ) {
  1658. f.classList.remove( 'visible' );
  1659. } );
  1660. // Notify subscribers of the change
  1661. dispatchEvent( 'fragmenthidden', { fragment: fragments[0], fragments: fragments } );
  1662. updateControls();
  1663. return true;
  1664. }
  1665. }
  1666. return false;
  1667. }
  1668. /**
  1669. * Cues a new automated slide if enabled in the config.
  1670. */
  1671. function cueAutoSlide() {
  1672. clearTimeout( autoSlideTimeout );
  1673. // Cue the next auto-slide if enabled
  1674. if( autoSlide && !isPaused() && !isOverview() ) {
  1675. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  1676. }
  1677. }
  1678. /**
  1679. * Cancels any ongoing request to auto-slide.
  1680. */
  1681. function cancelAutoSlide() {
  1682. clearTimeout( autoSlideTimeout );
  1683. }
  1684. function navigateLeft() {
  1685. // Reverse for RTL
  1686. if( config.rtl ) {
  1687. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  1688. slide( indexh + 1 );
  1689. }
  1690. }
  1691. // Normal navigation
  1692. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  1693. slide( indexh - 1 );
  1694. }
  1695. }
  1696. function navigateRight() {
  1697. // Reverse for RTL
  1698. if( config.rtl ) {
  1699. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  1700. slide( indexh - 1 );
  1701. }
  1702. }
  1703. // Normal navigation
  1704. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  1705. slide( indexh + 1 );
  1706. }
  1707. }
  1708. function navigateUp() {
  1709. // Prioritize hiding fragments
  1710. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  1711. slide( indexh, indexv - 1 );
  1712. }
  1713. }
  1714. function navigateDown() {
  1715. // Prioritize revealing fragments
  1716. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  1717. slide( indexh, indexv + 1 );
  1718. }
  1719. }
  1720. /**
  1721. * Navigates backwards, prioritized in the following order:
  1722. * 1) Previous fragment
  1723. * 2) Previous vertical slide
  1724. * 3) Previous horizontal slide
  1725. */
  1726. function navigatePrev() {
  1727. // Prioritize revealing fragments
  1728. if( previousFragment() === false ) {
  1729. if( availableRoutes().up ) {
  1730. navigateUp();
  1731. }
  1732. else {
  1733. // Fetch the previous horizontal slide, if there is one
  1734. var previousSlide = document.querySelector( HORIZONTAL_SLIDES_SELECTOR + '.past:nth-child(' + indexh + ')' );
  1735. if( previousSlide ) {
  1736. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  1737. var h = indexh - 1;
  1738. slide( h, v );
  1739. }
  1740. }
  1741. }
  1742. }
  1743. /**
  1744. * Same as #navigatePrev() but navigates forwards.
  1745. */
  1746. function navigateNext() {
  1747. // Prioritize revealing fragments
  1748. if( nextFragment() === false ) {
  1749. availableRoutes().down ? navigateDown() : navigateRight();
  1750. }
  1751. // If auto-sliding is enabled we need to cue up
  1752. // another timeout
  1753. cueAutoSlide();
  1754. }
  1755. // --------------------------------------------------------------------//
  1756. // ----------------------------- EVENTS -------------------------------//
  1757. // --------------------------------------------------------------------//
  1758. /**
  1759. * Handler for the document level 'keydown' event.
  1760. *
  1761. * @param {Object} event
  1762. */
  1763. function onDocumentKeyDown( event ) {
  1764. // Check if there's a focused element that could be using
  1765. // the keyboard
  1766. var activeElement = document.activeElement;
  1767. var hasFocus = !!( document.activeElement && ( document.activeElement.type || document.activeElement.href || document.activeElement.contentEditable !== 'inherit' ) );
  1768. // Disregard the event if there's a focused element or a
  1769. // keyboard modifier key is present
  1770. if( hasFocus || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  1771. // While paused only allow "unpausing" keyboard events (b and .)
  1772. if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) {
  1773. return false;
  1774. }
  1775. var triggered = false;
  1776. // 1. User defined key bindings
  1777. if( typeof config.keyboard === 'object' ) {
  1778. for( var key in config.keyboard ) {
  1779. // Check if this binding matches the pressed key
  1780. if( parseInt( key, 10 ) === event.keyCode ) {
  1781. var value = config.keyboard[ key ];
  1782. // Callback function
  1783. if( typeof value === 'function' ) {
  1784. value.apply( null, [ event ] );
  1785. }
  1786. // String shortcuts to reveal.js API
  1787. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  1788. Reveal[ value ].call();
  1789. }
  1790. triggered = true;
  1791. }
  1792. }
  1793. }
  1794. // 2. System defined key bindings
  1795. if( triggered === false ) {
  1796. // Assume true and try to prove false
  1797. triggered = true;
  1798. switch( event.keyCode ) {
  1799. // p, page up
  1800. case 80: case 33: navigatePrev(); break;
  1801. // n, page down
  1802. case 78: case 34: navigateNext(); break;
  1803. // h, left
  1804. case 72: case 37: navigateLeft(); break;
  1805. // l, right
  1806. case 76: case 39: navigateRight(); break;
  1807. // k, up
  1808. case 75: case 38: navigateUp(); break;
  1809. // j, down
  1810. case 74: case 40: navigateDown(); break;
  1811. // home
  1812. case 36: slide( 0 ); break;
  1813. // end
  1814. case 35: slide( Number.MAX_VALUE ); break;
  1815. // space
  1816. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  1817. // return
  1818. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  1819. // b, period, Logitech presenter tools "black screen" button
  1820. case 66: case 190: case 191: togglePause(); break;
  1821. // f
  1822. case 70: enterFullscreen(); break;
  1823. default:
  1824. triggered = false;
  1825. }
  1826. }
  1827. // If the input resulted in a triggered action we should prevent
  1828. // the browsers default behavior
  1829. if( triggered ) {
  1830. event.preventDefault();
  1831. }
  1832. // ESC or O key
  1833. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && supports3DTransforms ) {
  1834. toggleOverview();
  1835. event.preventDefault();
  1836. }
  1837. // If auto-sliding is enabled we need to cue up
  1838. // another timeout
  1839. cueAutoSlide();
  1840. }
  1841. /**
  1842. * Handler for the 'touchstart' event, enables support for
  1843. * swipe and pinch gestures.
  1844. */
  1845. function onTouchStart( event ) {
  1846. touch.startX = event.touches[0].clientX;
  1847. touch.startY = event.touches[0].clientY;
  1848. touch.startCount = event.touches.length;
  1849. // If there's two touches we need to memorize the distance
  1850. // between those two points to detect pinching
  1851. if( event.touches.length === 2 && config.overview ) {
  1852. touch.startSpan = distanceBetween( {
  1853. x: event.touches[1].clientX,
  1854. y: event.touches[1].clientY
  1855. }, {
  1856. x: touch.startX,
  1857. y: touch.startY
  1858. } );
  1859. }
  1860. }
  1861. /**
  1862. * Handler for the 'touchmove' event.
  1863. */
  1864. function onTouchMove( event ) {
  1865. // Each touch should only trigger one action
  1866. if( !touch.captured ) {
  1867. var currentX = event.touches[0].clientX;
  1868. var currentY = event.touches[0].clientY;
  1869. // If the touch started with two points and still has
  1870. // two active touches; test for the pinch gesture
  1871. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  1872. // The current distance in pixels between the two touch points
  1873. var currentSpan = distanceBetween( {
  1874. x: event.touches[1].clientX,
  1875. y: event.touches[1].clientY
  1876. }, {
  1877. x: touch.startX,
  1878. y: touch.startY
  1879. } );
  1880. // If the span is larger than the desire amount we've got
  1881. // ourselves a pinch
  1882. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  1883. touch.captured = true;
  1884. if( currentSpan < touch.startSpan ) {
  1885. activateOverview();
  1886. }
  1887. else {
  1888. deactivateOverview();
  1889. }
  1890. }
  1891. event.preventDefault();
  1892. }
  1893. // There was only one touch point, look for a swipe
  1894. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  1895. var deltaX = currentX - touch.startX,
  1896. deltaY = currentY - touch.startY;
  1897. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  1898. touch.captured = true;
  1899. navigateLeft();
  1900. }
  1901. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  1902. touch.captured = true;
  1903. navigateRight();
  1904. }
  1905. else if( deltaY > touch.threshold ) {
  1906. touch.captured = true;
  1907. navigateUp();
  1908. }
  1909. else if( deltaY < -touch.threshold ) {
  1910. touch.captured = true;
  1911. navigateDown();
  1912. }
  1913. // If we're embedded, only block touch events if they have
  1914. // triggered an action
  1915. if( config.embedded ) {
  1916. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  1917. event.preventDefault();
  1918. }
  1919. }
  1920. // Not embedded? Block them all to avoid needless tossing
  1921. // around of the viewport in iOS
  1922. else {
  1923. event.preventDefault();
  1924. }
  1925. }
  1926. }
  1927. // There's a bug with swiping on some Android devices unless
  1928. // the default action is always prevented
  1929. else if( navigator.userAgent.match( /android/gi ) ) {
  1930. event.preventDefault();
  1931. }
  1932. }
  1933. /**
  1934. * Handler for the 'touchend' event.
  1935. */
  1936. function onTouchEnd( event ) {
  1937. touch.captured = false;
  1938. }
  1939. /**
  1940. * Convert pointer down to touch start.
  1941. */
  1942. function onPointerDown( event ) {
  1943. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH ) {
  1944. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  1945. onTouchStart( event );
  1946. }
  1947. }
  1948. /**
  1949. * Convert pointer move to touch move.
  1950. */
  1951. function onPointerMove( event ) {
  1952. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH ) {
  1953. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  1954. onTouchMove( event );
  1955. }
  1956. }
  1957. /**
  1958. * Convert pointer up to touch end.
  1959. */
  1960. function onPointerUp( event ) {
  1961. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH ) {
  1962. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  1963. onTouchEnd( event );
  1964. }
  1965. }
  1966. /**
  1967. * Handles mouse wheel scrolling, throttled to avoid skipping
  1968. * multiple slides.
  1969. */
  1970. function onDocumentMouseScroll( event ) {
  1971. if( Date.now() - lastMouseWheelStep > 600 ) {
  1972. lastMouseWheelStep = Date.now();
  1973. var delta = event.detail || -event.wheelDelta;
  1974. if( delta > 0 ) {
  1975. navigateNext();
  1976. }
  1977. else {
  1978. navigatePrev();
  1979. }
  1980. }
  1981. }
  1982. /**
  1983. * Clicking on the progress bar results in a navigation to the
  1984. * closest approximate horizontal slide using this equation:
  1985. *
  1986. * ( clickX / presentationWidth ) * numberOfSlides
  1987. */
  1988. function onProgressClicked( event ) {
  1989. event.preventDefault();
  1990. var slidesTotal = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  1991. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  1992. slide( slideIndex );
  1993. }
  1994. /**
  1995. * Event handler for navigation control buttons.
  1996. */
  1997. function onNavigateLeftClicked( event ) { event.preventDefault(); navigateLeft(); }
  1998. function onNavigateRightClicked( event ) { event.preventDefault(); navigateRight(); }
  1999. function onNavigateUpClicked( event ) { event.preventDefault(); navigateUp(); }
  2000. function onNavigateDownClicked( event ) { event.preventDefault(); navigateDown(); }
  2001. function onNavigatePrevClicked( event ) { event.preventDefault(); navigatePrev(); }
  2002. function onNavigateNextClicked( event ) { event.preventDefault(); navigateNext(); }
  2003. /**
  2004. * Handler for the window level 'hashchange' event.
  2005. */
  2006. function onWindowHashChange( event ) {
  2007. readURL();
  2008. }
  2009. /**
  2010. * Handler for the window level 'resize' event.
  2011. */
  2012. function onWindowResize( event ) {
  2013. layout();
  2014. }
  2015. /**
  2016. * Invoked when a slide is and we're in the overview.
  2017. */
  2018. function onOverviewSlideClicked( event ) {
  2019. // TODO There's a bug here where the event listeners are not
  2020. // removed after deactivating the overview.
  2021. if( eventsAreBound && isOverview() ) {
  2022. event.preventDefault();
  2023. var element = event.target;
  2024. while( element && !element.nodeName.match( /section/gi ) ) {
  2025. element = element.parentNode;
  2026. }
  2027. if( element && !element.classList.contains( 'disabled' ) ) {
  2028. deactivateOverview();
  2029. if( element.nodeName.match( /section/gi ) ) {
  2030. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  2031. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  2032. slide( h, v );
  2033. }
  2034. }
  2035. }
  2036. }
  2037. /**
  2038. * Handles clicks on links that are set to preview in the
  2039. * iframe overlay.
  2040. */
  2041. function onPreviewLinkClicked( event ) {
  2042. var url = event.target.getAttribute( 'href' );
  2043. if( url ) {
  2044. openPreview( url );
  2045. event.preventDefault();
  2046. }
  2047. }
  2048. // --------------------------------------------------------------------//
  2049. // ------------------------------- API --------------------------------//
  2050. // --------------------------------------------------------------------//
  2051. return {
  2052. initialize: initialize,
  2053. configure: configure,
  2054. sync: sync,
  2055. // Navigation methods
  2056. slide: slide,
  2057. left: navigateLeft,
  2058. right: navigateRight,
  2059. up: navigateUp,
  2060. down: navigateDown,
  2061. prev: navigatePrev,
  2062. next: navigateNext,
  2063. prevFragment: previousFragment,
  2064. nextFragment: nextFragment,
  2065. // Deprecated aliases
  2066. navigateTo: slide,
  2067. navigateLeft: navigateLeft,
  2068. navigateRight: navigateRight,
  2069. navigateUp: navigateUp,
  2070. navigateDown: navigateDown,
  2071. navigatePrev: navigatePrev,
  2072. navigateNext: navigateNext,
  2073. // Forces an update in slide layout
  2074. layout: layout,
  2075. // Returns an object with the available routes as booleans (left/right/top/bottom)
  2076. availableRoutes: availableRoutes,
  2077. // Returns an object with the available fragments as booleans (prev/next)
  2078. availableFragments: availableFragments,
  2079. // Toggles the overview mode on/off
  2080. toggleOverview: toggleOverview,
  2081. // Toggles the "black screen" mode on/off
  2082. togglePause: togglePause,
  2083. // State checks
  2084. isOverview: isOverview,
  2085. isPaused: isPaused,
  2086. // Adds or removes all internal event listeners (such as keyboard)
  2087. addEventListeners: addEventListeners,
  2088. removeEventListeners: removeEventListeners,
  2089. // Returns the indices of the current, or specified, slide
  2090. getIndices: getIndices,
  2091. // Returns the slide at the specified index, y is optional
  2092. getSlide: function( x, y ) {
  2093. var horizontalSlide = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2094. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2095. if( typeof y !== 'undefined' ) {
  2096. return verticalSlides ? verticalSlides[ y ] : undefined;
  2097. }
  2098. return horizontalSlide;
  2099. },
  2100. // Returns the previous slide element, may be null
  2101. getPreviousSlide: function() {
  2102. return previousSlide;
  2103. },
  2104. // Returns the current slide element
  2105. getCurrentSlide: function() {
  2106. return currentSlide;
  2107. },
  2108. // Returns the current scale of the presentation content
  2109. getScale: function() {
  2110. return scale;
  2111. },
  2112. // Returns the current configuration object
  2113. getConfig: function() {
  2114. return config;
  2115. },
  2116. // Helper method, retrieves query string as a key/value hash
  2117. getQueryHash: function() {
  2118. var query = {};
  2119. location.search.replace( /[A-Z0-9]+?=(\w*)/gi, function(a) {
  2120. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  2121. } );
  2122. return query;
  2123. },
  2124. // Returns true if we're currently on the first slide
  2125. isFirstSlide: function() {
  2126. return document.querySelector( SLIDES_SELECTOR + '.past' ) == null ? true : false;
  2127. },
  2128. // Returns true if we're currently on the last slide
  2129. isLastSlide: function() {
  2130. if( currentSlide ) {
  2131. // Does this slide has next a sibling?
  2132. if( currentSlide.nextElementSibling ) return false;
  2133. // If it's vertical, does its parent have a next sibling?
  2134. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  2135. return true;
  2136. }
  2137. return false;
  2138. },
  2139. // Checks if reveal.js has been loaded and is ready for use
  2140. isReady: function() {
  2141. return loaded;
  2142. },
  2143. // Forward event binding to the reveal DOM element
  2144. addEventListener: function( type, listener, useCapture ) {
  2145. if( 'addEventListener' in window ) {
  2146. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  2147. }
  2148. },
  2149. removeEventListener: function( type, listener, useCapture ) {
  2150. if( 'addEventListener' in window ) {
  2151. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  2152. }
  2153. }
  2154. };
  2155. })();