reveal.js 54 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 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. // Number of milliseconds between automatically proceeding to the
  44. // next slide, disabled when set to 0, this value can be overwritten
  45. // by using a data-autoslide attribute on your slides
  46. autoSlide: 0,
  47. // Enable slide navigation via mouse wheel
  48. mouseWheel: false,
  49. // Apply a 3D roll to links on hover
  50. rollingLinks: true,
  51. // Theme (see /css/theme)
  52. theme: null,
  53. // Transition style
  54. transition: 'default', // default/cube/page/concave/zoom/linear/fade/none
  55. // Script dependencies to load
  56. dependencies: []
  57. },
  58. // Stores if the next slide should be shown automatically
  59. // after n milliseconds
  60. autoSlide = config.autoSlide,
  61. // The horizontal and verical index of the currently active slide
  62. indexh = 0,
  63. indexv = 0,
  64. // The previous and current slide HTML elements
  65. previousSlide,
  66. currentSlide,
  67. // Slides may hold a data-state attribute which we pick up and apply
  68. // as a class to the body. This list contains the combined state of
  69. // all current slides.
  70. state = [],
  71. // The current scale of the presentation (see width/height config)
  72. scale = 1,
  73. // Cached references to DOM elements
  74. dom = {},
  75. // Detect support for CSS 3D transforms
  76. supports3DTransforms = 'WebkitPerspective' in document.body.style ||
  77. 'MozPerspective' in document.body.style ||
  78. 'msPerspective' in document.body.style ||
  79. 'OPerspective' in document.body.style ||
  80. 'perspective' in document.body.style,
  81. // Detect support for CSS 2D transforms
  82. supports2DTransforms = 'WebkitTransform' in document.body.style ||
  83. 'MozTransform' in document.body.style ||
  84. 'msTransform' in document.body.style ||
  85. 'OTransform' in document.body.style ||
  86. 'transform' in document.body.style,
  87. // Throttles mouse wheel navigation
  88. mouseWheelTimeout = 0,
  89. // An interval used to automatically move on to the next slide
  90. autoSlideTimeout = 0,
  91. // Delays updates to the URL due to a Chrome thumbnailer bug
  92. writeURLTimeout = 0,
  93. // A delay used to activate the overview mode
  94. activateOverviewTimeout = 0,
  95. // A delay used to deactivate the overview mode
  96. deactivateOverviewTimeout = 0,
  97. // Flags if the interaction event listeners are bound
  98. eventsAreBound = false,
  99. // Holds information about the currently ongoing touch input
  100. touch = {
  101. startX: 0,
  102. startY: 0,
  103. startSpan: 0,
  104. startCount: 0,
  105. handled: false,
  106. threshold: 80
  107. };
  108. /**
  109. * Starts up the presentation if the client is capable.
  110. */
  111. function initialize( options ) {
  112. if( !supports2DTransforms && !supports3DTransforms ) {
  113. document.body.setAttribute( 'class', 'no-transforms' );
  114. // If the browser doesn't support core features we won't be
  115. // using JavaScript to control the presentation
  116. return;
  117. }
  118. // Force a layout when the whole page, incl fonts, has loaded
  119. window.addEventListener( 'load', layout, false );
  120. // Copy options over to our config object
  121. extend( config, options );
  122. // Hide the address bar in mobile browsers
  123. hideAddressBar();
  124. // Loads the dependencies and continues to #start() once done
  125. load();
  126. }
  127. /**
  128. * Finds and stores references to DOM elements which are
  129. * required by the presentation. If a required element is
  130. * not found, it is created.
  131. */
  132. function setupDOM() {
  133. // Cache references to key DOM elements
  134. dom.theme = document.querySelector( '#theme' );
  135. dom.wrapper = document.querySelector( '.reveal' );
  136. dom.slides = document.querySelector( '.reveal .slides' );
  137. // Progress bar
  138. if( !dom.wrapper.querySelector( '.progress' ) && config.progress ) {
  139. var progressElement = document.createElement( 'div' );
  140. progressElement.classList.add( 'progress' );
  141. progressElement.innerHTML = '<span></span>';
  142. dom.wrapper.appendChild( progressElement );
  143. }
  144. // Arrow controls
  145. if( !dom.wrapper.querySelector( '.controls' ) && config.controls ) {
  146. var controlsElement = document.createElement( 'aside' );
  147. controlsElement.classList.add( 'controls' );
  148. controlsElement.innerHTML = '<div class="navigate-left"></div>' +
  149. '<div class="navigate-right"></div>' +
  150. '<div class="navigate-up"></div>' +
  151. '<div class="navigate-down"></div>';
  152. dom.wrapper.appendChild( controlsElement );
  153. }
  154. // Presentation background element
  155. if( !dom.wrapper.querySelector( '.state-background' ) ) {
  156. var backgroundElement = document.createElement( 'div' );
  157. backgroundElement.classList.add( 'state-background' );
  158. dom.wrapper.appendChild( backgroundElement );
  159. }
  160. // Overlay graphic which is displayed during the paused mode
  161. if( !dom.wrapper.querySelector( '.pause-overlay' ) ) {
  162. var pausedElement = document.createElement( 'div' );
  163. pausedElement.classList.add( 'pause-overlay' );
  164. dom.wrapper.appendChild( pausedElement );
  165. }
  166. // Cache references to elements
  167. dom.progress = document.querySelector( '.reveal .progress' );
  168. dom.progressbar = document.querySelector( '.reveal .progress span' );
  169. if ( config.controls ) {
  170. dom.controls = document.querySelector( '.reveal .controls' );
  171. // There can be multiple instances of controls throughout the page
  172. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  173. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  174. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  175. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  176. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  177. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  178. }
  179. }
  180. /**
  181. * Hides the address bar if we're on a mobile device.
  182. */
  183. function hideAddressBar() {
  184. if( /iphone|ipod|android/gi.test( navigator.userAgent ) && !/crios/gi.test( navigator.userAgent ) ) {
  185. // Events that should trigger the address bar to hide
  186. window.addEventListener( 'load', removeAddressBar, false );
  187. window.addEventListener( 'orientationchange', removeAddressBar, false );
  188. }
  189. }
  190. /**
  191. * Loads the dependencies of reveal.js. Dependencies are
  192. * defined via the configuration option 'dependencies'
  193. * and will be loaded prior to starting/binding reveal.js.
  194. * Some dependencies may have an 'async' flag, if so they
  195. * will load after reveal.js has been started up.
  196. */
  197. function load() {
  198. var scripts = [],
  199. scriptsAsync = [];
  200. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  201. var s = config.dependencies[i];
  202. // Load if there's no condition or the condition is truthy
  203. if( !s.condition || s.condition() ) {
  204. if( s.async ) {
  205. scriptsAsync.push( s.src );
  206. }
  207. else {
  208. scripts.push( s.src );
  209. }
  210. // Extension may contain callback functions
  211. if( typeof s.callback === 'function' ) {
  212. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], s.callback );
  213. }
  214. }
  215. }
  216. // Called once synchronous scritps finish loading
  217. function proceed() {
  218. if( scriptsAsync.length ) {
  219. // Load asynchronous scripts
  220. head.js.apply( null, scriptsAsync );
  221. }
  222. start();
  223. }
  224. if( scripts.length ) {
  225. head.ready( proceed );
  226. // Load synchronous scripts
  227. head.js.apply( null, scripts );
  228. }
  229. else {
  230. proceed();
  231. }
  232. }
  233. /**
  234. * Starts up reveal.js by binding input events and navigating
  235. * to the current URL deeplink if there is one.
  236. */
  237. function start() {
  238. // Make sure we've got all the DOM elements we need
  239. setupDOM();
  240. // Subscribe to input
  241. addEventListeners();
  242. // Updates the presentation to match the current configuration values
  243. configure();
  244. // Force an initial layout, will thereafter be invoked as the window
  245. // is resized
  246. layout();
  247. // Read the initial hash
  248. readURL();
  249. // Start auto-sliding if it's enabled
  250. cueAutoSlide();
  251. // Notify listeners that the presentation is ready but use a 1ms
  252. // timeout to ensure it's not fired synchronously after #initialize()
  253. setTimeout( function() {
  254. dispatchEvent( 'ready', {
  255. 'indexh': indexh,
  256. 'indexv': indexv,
  257. 'currentSlide': currentSlide
  258. } );
  259. }, 1 );
  260. }
  261. /**
  262. * Applies the configuration settings from the config object.
  263. */
  264. function configure( options ) {
  265. dom.wrapper.classList.remove( config.transition );
  266. // New config options may be passed when this method
  267. // is invoked through the API after initialization
  268. if( typeof options === 'object' ) extend( config, options );
  269. // Force linear transition based on browser capabilities
  270. if( supports3DTransforms === false ) config.transition = 'linear';
  271. dom.wrapper.classList.add( config.transition );
  272. dom.controls.style.display = ( config.controls && dom.controls ) ? 'block' : 'none';
  273. dom.progress.style.display = ( config.progress && dom.progress ) ? 'block' : 'none';
  274. dom.wrapper.classList.toggle( 'rtl', config.rtl );
  275. dom.wrapper.classList.toggle( 'center', config.center );
  276. if( config.mouseWheel ) {
  277. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  278. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  279. }
  280. else {
  281. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  282. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  283. }
  284. // 3D links
  285. if( config.rollingLinks ) {
  286. enable3DLinks();
  287. }
  288. else {
  289. disable3DLinks();
  290. }
  291. // Load the theme in the config, if it's not already loaded
  292. if( config.theme && dom.theme ) {
  293. var themeURL = dom.theme.getAttribute( 'href' );
  294. var themeFinder = /[^\/]*?(?=\.css)/;
  295. var themeName = themeURL.match(themeFinder)[0];
  296. if( config.theme !== themeName ) {
  297. themeURL = themeURL.replace(themeFinder, config.theme);
  298. dom.theme.setAttribute( 'href', themeURL );
  299. }
  300. }
  301. }
  302. /**
  303. * Binds all event listeners.
  304. */
  305. function addEventListeners() {
  306. eventsAreBound = true;
  307. window.addEventListener( 'hashchange', onWindowHashChange, false );
  308. window.addEventListener( 'resize', onWindowResize, false );
  309. if( config.touch ) {
  310. document.addEventListener( 'touchstart', onDocumentTouchStart, false );
  311. document.addEventListener( 'touchmove', onDocumentTouchMove, false );
  312. document.addEventListener( 'touchend', onDocumentTouchEnd, false );
  313. }
  314. if( config.keyboard ) {
  315. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  316. }
  317. if ( config.progress && dom.progress ) {
  318. dom.progress.addEventListener( 'click', onProgressClicked, false );
  319. }
  320. if ( config.controls && dom.controls ) {
  321. var actionEvent = 'ontouchstart' in window && window.ontouchstart != null ? 'touchstart' : 'click';
  322. dom.controlsLeft.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateLeftClicked, false ); } );
  323. dom.controlsRight.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateRightClicked, false ); } );
  324. dom.controlsUp.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateUpClicked, false ); } );
  325. dom.controlsDown.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateDownClicked, false ); } );
  326. dom.controlsPrev.forEach( function( el ) { el.addEventListener( actionEvent, onNavigatePrevClicked, false ); } );
  327. dom.controlsNext.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateNextClicked, false ); } );
  328. }
  329. }
  330. /**
  331. * Unbinds all event listeners.
  332. */
  333. function removeEventListeners() {
  334. eventsAreBound = false;
  335. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  336. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  337. window.removeEventListener( 'resize', onWindowResize, false );
  338. if( config.touch ) {
  339. document.removeEventListener( 'touchstart', onDocumentTouchStart, false );
  340. document.removeEventListener( 'touchmove', onDocumentTouchMove, false );
  341. document.removeEventListener( 'touchend', onDocumentTouchEnd, false );
  342. }
  343. if ( config.progress && dom.progress ) {
  344. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  345. }
  346. if ( config.controls && dom.controls ) {
  347. var actionEvent = 'ontouchstart' in window && window.ontouchstart != null ? 'touchstart' : 'click';
  348. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( actionEvent, onNavigateLeftClicked, false ); } );
  349. dom.controlsRight.forEach( function( el ) { el.removeEventListener( actionEvent, onNavigateRightClicked, false ); } );
  350. dom.controlsUp.forEach( function( el ) { el.removeEventListener( actionEvent, onNavigateUpClicked, false ); } );
  351. dom.controlsDown.forEach( function( el ) { el.removeEventListener( actionEvent, onNavigateDownClicked, false ); } );
  352. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( actionEvent, onNavigatePrevClicked, false ); } );
  353. dom.controlsNext.forEach( function( el ) { el.removeEventListener( actionEvent, onNavigateNextClicked, false ); } );
  354. }
  355. }
  356. /**
  357. * Extend object a with the properties of object b.
  358. * If there's a conflict, object b takes precedence.
  359. */
  360. function extend( a, b ) {
  361. for( var i in b ) {
  362. a[ i ] = b[ i ];
  363. }
  364. }
  365. /**
  366. * Converts the target object to an array.
  367. */
  368. function toArray( o ) {
  369. return Array.prototype.slice.call( o );
  370. }
  371. /**
  372. * Measures the distance in pixels between point a
  373. * and point b.
  374. *
  375. * @param {Object} a point with x/y properties
  376. * @param {Object} b point with x/y properties
  377. */
  378. function distanceBetween( a, b ) {
  379. var dx = a.x - b.x,
  380. dy = a.y - b.y;
  381. return Math.sqrt( dx*dx + dy*dy );
  382. }
  383. /**
  384. * Causes the address bar to hide on mobile devices,
  385. * more vertical space ftw.
  386. */
  387. function removeAddressBar() {
  388. if( window.orientation === 0 ) {
  389. document.documentElement.style.overflow = 'scroll';
  390. document.body.style.height = '120%';
  391. }
  392. else {
  393. document.documentElement.style.overflow = '';
  394. document.body.style.height = '100%';
  395. }
  396. setTimeout( function() {
  397. window.scrollTo( 0, 1 );
  398. }, 10 );
  399. }
  400. /**
  401. * Dispatches an event of the specified type from the
  402. * reveal DOM element.
  403. */
  404. function dispatchEvent( type, properties ) {
  405. var event = document.createEvent( "HTMLEvents", 1, 2 );
  406. event.initEvent( type, true, true );
  407. extend( event, properties );
  408. dom.wrapper.dispatchEvent( event );
  409. }
  410. /**
  411. * Wrap all links in 3D goodness.
  412. */
  413. function enable3DLinks() {
  414. if( supports3DTransforms && !( 'msPerspective' in document.body.style ) ) {
  415. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a:not(.image)' );
  416. for( var i = 0, len = anchors.length; i < len; i++ ) {
  417. var anchor = anchors[i];
  418. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  419. var span = document.createElement('span');
  420. span.setAttribute('data-title', anchor.text);
  421. span.innerHTML = anchor.innerHTML;
  422. anchor.classList.add( 'roll' );
  423. anchor.innerHTML = '';
  424. anchor.appendChild(span);
  425. }
  426. }
  427. }
  428. }
  429. /**
  430. * Unwrap all 3D links.
  431. */
  432. function disable3DLinks() {
  433. var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  434. for( var i = 0, len = anchors.length; i < len; i++ ) {
  435. var anchor = anchors[i];
  436. var span = anchor.querySelector( 'span' );
  437. if( span ) {
  438. anchor.classList.remove( 'roll' );
  439. anchor.innerHTML = span.innerHTML;
  440. }
  441. }
  442. }
  443. /**
  444. * Return a sorted fragments list, ordered by an increasing
  445. * "data-fragment-index" attribute.
  446. *
  447. * Fragments will be revealed in the order that they are returned by
  448. * this function, so you can use the index attributes to control the
  449. * order of fragment appearance.
  450. *
  451. * To maintain a sensible default fragment order, fragments are presumed
  452. * to be passed in document order. This function adds a "fragment-index"
  453. * attribute to each node if such an attribute is not already present,
  454. * and sets that attribute to an integer value which is the position of
  455. * the fragment within the fragments list.
  456. */
  457. function sortFragments( fragments ) {
  458. var a = toArray( fragments );
  459. a.forEach( function( el, idx ) {
  460. if( !el.hasAttribute( 'data-fragment-index' ) ) {
  461. el.setAttribute( 'data-fragment-index', idx );
  462. }
  463. } );
  464. a.sort( function( l, r ) {
  465. return l.getAttribute( 'data-fragment-index' ) - r.getAttribute( 'data-fragment-index');
  466. } );
  467. return a
  468. }
  469. /**
  470. * Applies JavaScript-controlled layout rules to the
  471. * presentation.
  472. */
  473. function layout() {
  474. if( dom.wrapper ) {
  475. // Available space to scale within
  476. var availableWidth = dom.wrapper.offsetWidth,
  477. availableHeight = dom.wrapper.offsetHeight;
  478. // Reduce availabe space by margin
  479. availableWidth -= ( availableHeight * config.margin );
  480. availableHeight -= ( availableHeight * config.margin );
  481. // Dimensions of the content
  482. var slideWidth = config.width,
  483. slideHeight = config.height;
  484. // Slide width may be a percentage of available width
  485. if( typeof slideWidth === 'string' && /%$/.test( slideWidth ) ) {
  486. slideWidth = parseInt( slideWidth, 10 ) / 100 * availableWidth;
  487. }
  488. // Slide height may be a percentage of available height
  489. if( typeof slideHeight === 'string' && /%$/.test( slideHeight ) ) {
  490. slideHeight = parseInt( slideHeight, 10 ) / 100 * availableHeight;
  491. }
  492. dom.slides.style.width = slideWidth + 'px';
  493. dom.slides.style.height = slideHeight + 'px';
  494. // Determine scale of content to fit within available space
  495. scale = Math.min( availableWidth / slideWidth, availableHeight / slideHeight );
  496. // Respect max/min scale settings
  497. scale = Math.max( scale, config.minScale );
  498. scale = Math.min( scale, config.maxScale );
  499. // Prefer applying scale via zoom since Chrome blurs scaled content
  500. // with nested transforms
  501. if( typeof dom.slides.style.zoom !== 'undefined' && !navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi ) ) {
  502. dom.slides.style.zoom = scale;
  503. }
  504. // Apply scale transform as a fallback
  505. else {
  506. var transform = 'translate(-50%, -50%) scale('+ scale +') translate(50%, 50%)';
  507. dom.slides.style.WebkitTransform = transform;
  508. dom.slides.style.MozTransform = transform;
  509. dom.slides.style.msTransform = transform;
  510. dom.slides.style.OTransform = transform;
  511. dom.slides.style.transform = transform;
  512. }
  513. // Select all slides, vertical and horizontal
  514. var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
  515. for( var i = 0, len = slides.length; i < len; i++ ) {
  516. var slide = slides[ i ];
  517. // Don't bother updating invisible slides
  518. if( slide.style.display === 'none' ) {
  519. continue;
  520. }
  521. if( config.center ) {
  522. // Vertical stacks are not centered since their section
  523. // children will be
  524. if( slide.classList.contains( 'stack' ) ) {
  525. slide.style.top = 0;
  526. }
  527. else {
  528. slide.style.top = Math.max( - ( slide.offsetHeight / 2 ) - 20, -slideHeight / 2 ) + 'px';
  529. }
  530. }
  531. else {
  532. slide.style.top = '';
  533. }
  534. }
  535. }
  536. }
  537. /**
  538. * Stores the vertical index of a stack so that the same
  539. * vertical slide can be selected when navigating to and
  540. * from the stack.
  541. *
  542. * @param {HTMLElement} stack The vertical stack element
  543. * @param {int} v Index to memorize
  544. */
  545. function setPreviousVerticalIndex( stack, v ) {
  546. if( stack ) {
  547. stack.setAttribute( 'data-previous-indexv', v || 0 );
  548. }
  549. }
  550. /**
  551. * Retrieves the vertical index which was stored using
  552. * #setPreviousVerticalIndex() or 0 if no previous index
  553. * exists.
  554. *
  555. * @param {HTMLElement} stack The vertical stack element
  556. */
  557. function getPreviousVerticalIndex( stack ) {
  558. if( stack && stack.classList.contains( 'stack' ) ) {
  559. return parseInt( stack.getAttribute( 'data-previous-indexv' ) || 0, 10 );
  560. }
  561. return 0;
  562. }
  563. /**
  564. * Displays the overview of slides (quick nav) by
  565. * scaling down and arranging all slide elements.
  566. *
  567. * Experimental feature, might be dropped if perf
  568. * can't be improved.
  569. */
  570. function activateOverview() {
  571. // Only proceed if enabled in config
  572. if( config.overview ) {
  573. // Don't auto-slide while in overview mode
  574. cancelAutoSlide();
  575. var wasActive = dom.wrapper.classList.contains( 'overview' );
  576. dom.wrapper.classList.add( 'overview' );
  577. dom.wrapper.classList.remove( 'exit-overview' );
  578. clearTimeout( activateOverviewTimeout );
  579. clearTimeout( deactivateOverviewTimeout );
  580. // Not the pretties solution, but need to let the overview
  581. // class apply first so that slides are measured accurately
  582. // before we can position them
  583. activateOverviewTimeout = setTimeout( function(){
  584. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  585. for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
  586. var hslide = horizontalSlides[i],
  587. htransform = 'translateZ(-2500px) translate(' + ( ( i - indexh ) * 105 ) + '%, 0%)';
  588. hslide.setAttribute( 'data-index-h', i );
  589. hslide.style.display = 'block';
  590. hslide.style.WebkitTransform = htransform;
  591. hslide.style.MozTransform = htransform;
  592. hslide.style.msTransform = htransform;
  593. hslide.style.OTransform = htransform;
  594. hslide.style.transform = htransform;
  595. if( hslide.classList.contains( 'stack' ) ) {
  596. var verticalSlides = hslide.querySelectorAll( 'section' );
  597. for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
  598. var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );
  599. var vslide = verticalSlides[j],
  600. vtransform = 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)';
  601. vslide.setAttribute( 'data-index-h', i );
  602. vslide.setAttribute( 'data-index-v', j );
  603. vslide.style.display = 'block';
  604. vslide.style.WebkitTransform = vtransform;
  605. vslide.style.MozTransform = vtransform;
  606. vslide.style.msTransform = vtransform;
  607. vslide.style.OTransform = vtransform;
  608. vslide.style.transform = vtransform;
  609. // Navigate to this slide on click
  610. vslide.addEventListener( 'click', onOverviewSlideClicked, true );
  611. }
  612. }
  613. else {
  614. // Navigate to this slide on click
  615. hslide.addEventListener( 'click', onOverviewSlideClicked, true );
  616. }
  617. }
  618. layout();
  619. if( !wasActive ) {
  620. // Notify observers of the overview showing
  621. dispatchEvent( 'overviewshown', {
  622. 'indexh': indexh,
  623. 'indexv': indexv,
  624. 'currentSlide': currentSlide
  625. } );
  626. }
  627. }, 10 );
  628. }
  629. }
  630. /**
  631. * Exits the slide overview and enters the currently
  632. * active slide.
  633. */
  634. function deactivateOverview() {
  635. // Only proceed if enabled in config
  636. if( config.overview ) {
  637. clearTimeout( activateOverviewTimeout );
  638. clearTimeout( deactivateOverviewTimeout );
  639. dom.wrapper.classList.remove( 'overview' );
  640. // Temporarily add a class so that transitions can do different things
  641. // depending on whether they are exiting/entering overview, or just
  642. // moving from slide to slide
  643. dom.wrapper.classList.add( 'exit-overview' );
  644. deactivateOverviewTimeout = setTimeout( function () {
  645. dom.wrapper.classList.remove( 'exit-overview' );
  646. }, 10);
  647. // Select all slides
  648. var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
  649. for( var i = 0, len = slides.length; i < len; i++ ) {
  650. var element = slides[i];
  651. element.style.display = '';
  652. // Resets all transforms to use the external styles
  653. element.style.WebkitTransform = '';
  654. element.style.MozTransform = '';
  655. element.style.msTransform = '';
  656. element.style.OTransform = '';
  657. element.style.transform = '';
  658. element.removeEventListener( 'click', onOverviewSlideClicked, true );
  659. }
  660. slide( indexh, indexv );
  661. cueAutoSlide();
  662. // Notify observers of the overview hiding
  663. dispatchEvent( 'overviewhidden', {
  664. 'indexh': indexh,
  665. 'indexv': indexv,
  666. 'currentSlide': currentSlide
  667. } );
  668. }
  669. }
  670. /**
  671. * Toggles the slide overview mode on and off.
  672. *
  673. * @param {Boolean} override Optional flag which overrides the
  674. * toggle logic and forcibly sets the desired state. True means
  675. * overview is open, false means it's closed.
  676. */
  677. function toggleOverview( override ) {
  678. if( typeof override === 'boolean' ) {
  679. override ? activateOverview() : deactivateOverview();
  680. }
  681. else {
  682. isOverview() ? deactivateOverview() : activateOverview();
  683. }
  684. }
  685. /**
  686. * Checks if the overview is currently active.
  687. *
  688. * @return {Boolean} true if the overview is active,
  689. * false otherwise
  690. */
  691. function isOverview() {
  692. return dom.wrapper.classList.contains( 'overview' );
  693. }
  694. /**
  695. * Handling the fullscreen functionality via the fullscreen API
  696. *
  697. * @see http://fullscreen.spec.whatwg.org/
  698. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  699. */
  700. function enterFullscreen() {
  701. var element = document.body;
  702. // Check which implementation is available
  703. var requestMethod = element.requestFullScreen ||
  704. element.webkitRequestFullScreen ||
  705. element.mozRequestFullScreen ||
  706. element.msRequestFullScreen;
  707. if( requestMethod ) {
  708. requestMethod.apply( element );
  709. }
  710. }
  711. /**
  712. * Enters the paused mode which fades everything on screen to
  713. * black.
  714. */
  715. function pause() {
  716. cancelAutoSlide();
  717. dom.wrapper.classList.add( 'paused' );
  718. }
  719. /**
  720. * Exits from the paused mode.
  721. */
  722. function resume() {
  723. cueAutoSlide();
  724. dom.wrapper.classList.remove( 'paused' );
  725. }
  726. /**
  727. * Toggles the paused mode on and off.
  728. */
  729. function togglePause() {
  730. if( isPaused() ) {
  731. resume();
  732. }
  733. else {
  734. pause();
  735. }
  736. }
  737. /**
  738. * Checks if we are currently in the paused mode.
  739. */
  740. function isPaused() {
  741. return dom.wrapper.classList.contains( 'paused' );
  742. }
  743. /**
  744. * Steps from the current point in the presentation to the
  745. * slide which matches the specified horizontal and vertical
  746. * indices.
  747. *
  748. * @param {int} h Horizontal index of the target slide
  749. * @param {int} v Vertical index of the target slide
  750. * @param {int} f Optional index of a fragment within the
  751. * target slide to activate
  752. */
  753. function slide( h, v, f ) {
  754. // Remember where we were at before
  755. previousSlide = currentSlide;
  756. // Query all horizontal slides in the deck
  757. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  758. // If no vertical index is specified and the upcoming slide is a
  759. // stack, resume at its previous vertical index
  760. if( v === undefined ) {
  761. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  762. }
  763. // If we were on a vertical stack, remember what vertical index
  764. // it was on so we can resume at the same position when returning
  765. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  766. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  767. }
  768. // Remember the state before this slide
  769. var stateBefore = state.concat();
  770. // Reset the state array
  771. state.length = 0;
  772. var indexhBefore = indexh,
  773. indexvBefore = indexv;
  774. // Activate and transition to the new slide
  775. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  776. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  777. layout();
  778. // Apply the new state
  779. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  780. // Check if this state existed on the previous slide. If it
  781. // did, we will avoid adding it repeatedly
  782. for( var j = 0; j < stateBefore.length; j++ ) {
  783. if( stateBefore[j] === state[i] ) {
  784. stateBefore.splice( j, 1 );
  785. continue stateLoop;
  786. }
  787. }
  788. document.documentElement.classList.add( state[i] );
  789. // Dispatch custom event matching the state's name
  790. dispatchEvent( state[i] );
  791. }
  792. // Clean up the remains of the previous state
  793. while( stateBefore.length ) {
  794. document.documentElement.classList.remove( stateBefore.pop() );
  795. }
  796. // If the overview is active, re-activate it to update positions
  797. if( isOverview() ) {
  798. activateOverview();
  799. }
  800. // Update the URL hash after a delay since updating it mid-transition
  801. // is likely to cause visual lag
  802. writeURL( 1500 );
  803. // Find the current horizontal slide and any possible vertical slides
  804. // within it
  805. var currentHorizontalSlide = horizontalSlides[ indexh ],
  806. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  807. // Store references to the previous and current slides
  808. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  809. // Show fragment, if specified
  810. if( typeof f !== 'undefined' ) {
  811. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  812. toArray( fragments ).forEach( function( fragment, indexf ) {
  813. if( indexf < f ) {
  814. fragment.classList.add( 'visible' );
  815. }
  816. else {
  817. fragment.classList.remove( 'visible' );
  818. }
  819. } );
  820. }
  821. // Dispatch an event if the slide changed
  822. if( indexh !== indexhBefore || indexv !== indexvBefore ) {
  823. dispatchEvent( 'slidechanged', {
  824. 'indexh': indexh,
  825. 'indexv': indexv,
  826. 'previousSlide': previousSlide,
  827. 'currentSlide': currentSlide
  828. } );
  829. }
  830. else {
  831. // Ensure that the previous slide is never the same as the current
  832. previousSlide = null;
  833. }
  834. // Solves an edge case where the previous slide maintains the
  835. // 'present' class when navigating between adjacent vertical
  836. // stacks
  837. if( previousSlide ) {
  838. previousSlide.classList.remove( 'present' );
  839. // Reset all slides upon navigate to home
  840. // Issue: #285
  841. if ( document.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  842. // Launch async task
  843. setTimeout( function () {
  844. var slides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  845. for( i in slides ) {
  846. if( slides[i] ) {
  847. // Reset stack
  848. setPreviousVerticalIndex( slides[i], 0 );
  849. }
  850. }
  851. }, 0 );
  852. }
  853. }
  854. updateControls();
  855. updateProgress();
  856. }
  857. /**
  858. * Updates one dimension of slides by showing the slide
  859. * with the specified index.
  860. *
  861. * @param {String} selector A CSS selector that will fetch
  862. * the group of slides we are working with
  863. * @param {Number} index The index of the slide that should be
  864. * shown
  865. *
  866. * @return {Number} The index of the slide that is now shown,
  867. * might differ from the passed in index if it was out of
  868. * bounds.
  869. */
  870. function updateSlides( selector, index ) {
  871. // Select all slides and convert the NodeList result to
  872. // an array
  873. var slides = toArray( document.querySelectorAll( selector ) ),
  874. slidesLength = slides.length;
  875. if( slidesLength ) {
  876. // Should the index loop?
  877. if( config.loop ) {
  878. index %= slidesLength;
  879. if( index < 0 ) {
  880. index = slidesLength + index;
  881. }
  882. }
  883. // Enforce max and minimum index bounds
  884. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  885. for( var i = 0; i < slidesLength; i++ ) {
  886. var element = slides[i];
  887. // Optimization; hide all slides that are three or more steps
  888. // away from the present slide
  889. if( isOverview() === false ) {
  890. // The distance loops so that it measures 1 between the first
  891. // and last slides
  892. var distance = Math.abs( ( index - i ) % ( slidesLength - 3 ) ) || 0;
  893. element.style.display = distance > 3 ? 'none' : 'block';
  894. }
  895. slides[i].classList.remove( 'past' );
  896. slides[i].classList.remove( 'present' );
  897. slides[i].classList.remove( 'future' );
  898. if( i < index ) {
  899. // Any element previous to index is given the 'past' class
  900. slides[i].classList.add( 'past' );
  901. }
  902. else if( i > index ) {
  903. // Any element subsequent to index is given the 'future' class
  904. slides[i].classList.add( 'future' );
  905. }
  906. // If this element contains vertical slides
  907. if( element.querySelector( 'section' ) ) {
  908. slides[i].classList.add( 'stack' );
  909. }
  910. }
  911. // Mark the current slide as present
  912. slides[index].classList.add( 'present' );
  913. // If this slide has a state associated with it, add it
  914. // onto the current state of the deck
  915. var slideState = slides[index].getAttribute( 'data-state' );
  916. if( slideState ) {
  917. state = state.concat( slideState.split( ' ' ) );
  918. }
  919. // If this slide has a data-autoslide attribtue associated use this as
  920. // autoSlide value otherwise use the global configured time
  921. var slideAutoSlide = slides[index].getAttribute( 'data-autoslide' );
  922. if( slideAutoSlide ) {
  923. autoSlide = parseInt( slideAutoSlide, 10 );
  924. }
  925. else {
  926. autoSlide = config.autoSlide;
  927. }
  928. }
  929. else {
  930. // Since there are no slides we can't be anywhere beyond the
  931. // zeroth index
  932. index = 0;
  933. }
  934. return index;
  935. }
  936. /**
  937. * Updates the progress bar to reflect the current slide.
  938. */
  939. function updateProgress() {
  940. // Update progress if enabled
  941. if( config.progress && dom.progress ) {
  942. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  943. // The number of past and total slides
  944. var totalCount = document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  945. var pastCount = 0;
  946. // Step through all slides and count the past ones
  947. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  948. var horizontalSlide = horizontalSlides[i];
  949. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  950. for( var j = 0; j < verticalSlides.length; j++ ) {
  951. // Stop as soon as we arrive at the present
  952. if( verticalSlides[j].classList.contains( 'present' ) ) {
  953. break mainLoop;
  954. }
  955. pastCount++;
  956. }
  957. // Stop as soon as we arrive at the present
  958. if( horizontalSlide.classList.contains( 'present' ) ) {
  959. break;
  960. }
  961. // Don't count the wrapping section for vertical slides
  962. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  963. pastCount++;
  964. }
  965. }
  966. dom.progressbar.style.width = ( pastCount / ( totalCount - 1 ) ) * window.innerWidth + 'px';
  967. }
  968. }
  969. /**
  970. * Updates the state of all control/navigation arrows.
  971. */
  972. function updateControls() {
  973. if ( config.controls && dom.controls ) {
  974. var routes = availableRoutes();
  975. // Remove the 'enabled' class from all directions
  976. dom.controlsLeft.concat( dom.controlsRight )
  977. .concat( dom.controlsUp )
  978. .concat( dom.controlsDown )
  979. .concat( dom.controlsPrev )
  980. .concat( dom.controlsNext ).forEach( function( node ) {
  981. node.classList.remove( 'enabled' );
  982. } );
  983. // Add the 'enabled' class to the available routes
  984. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  985. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  986. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  987. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  988. // Prev/next buttons
  989. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  990. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  991. }
  992. }
  993. /**
  994. * Determine what available routes there are for navigation.
  995. *
  996. * @return {Object} containing four booleans: left/right/up/down
  997. */
  998. function availableRoutes() {
  999. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1000. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1001. return {
  1002. left: indexh > 0,
  1003. right: indexh < horizontalSlides.length - 1,
  1004. up: indexv > 0,
  1005. down: indexv < verticalSlides.length - 1
  1006. };
  1007. }
  1008. /**
  1009. * Reads the current URL (hash) and navigates accordingly.
  1010. */
  1011. function readURL() {
  1012. var hash = window.location.hash;
  1013. // Attempt to parse the hash as either an index or name
  1014. var bits = hash.slice( 2 ).split( '/' ),
  1015. name = hash.replace( /#|\//gi, '' );
  1016. // If the first bit is invalid and there is a name we can
  1017. // assume that this is a named link
  1018. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  1019. // Find the slide with the specified name
  1020. var element = document.querySelector( '#' + name );
  1021. if( element ) {
  1022. // Find the position of the named slide and navigate to it
  1023. var indices = Reveal.getIndices( element );
  1024. slide( indices.h, indices.v );
  1025. }
  1026. // If the slide doesn't exist, navigate to the current slide
  1027. else {
  1028. slide( indexh, indexv );
  1029. }
  1030. }
  1031. else {
  1032. // Read the index components of the hash
  1033. var h = parseInt( bits[0], 10 ) || 0,
  1034. v = parseInt( bits[1], 10 ) || 0;
  1035. slide( h, v );
  1036. }
  1037. }
  1038. /**
  1039. * Updates the page URL (hash) to reflect the current
  1040. * state.
  1041. *
  1042. * @param {Number} delay The time in ms to wait before
  1043. * writing the hash
  1044. */
  1045. function writeURL( delay ) {
  1046. if( config.history ) {
  1047. // Make sure there's never more than one timeout running
  1048. clearTimeout( writeURLTimeout );
  1049. // If a delay is specified, timeout this call
  1050. if( typeof delay === 'number' ) {
  1051. writeURLTimeout = setTimeout( writeURL, delay );
  1052. }
  1053. else {
  1054. var url = '/';
  1055. // If the current slide has an ID, use that as a named link
  1056. if( currentSlide && typeof currentSlide.getAttribute( 'id' ) === 'string' ) {
  1057. url = '/' + currentSlide.getAttribute( 'id' );
  1058. }
  1059. // Otherwise use the /h/v index
  1060. else {
  1061. if( indexh > 0 || indexv > 0 ) url += indexh;
  1062. if( indexv > 0 ) url += '/' + indexv;
  1063. }
  1064. window.location.hash = url;
  1065. }
  1066. }
  1067. }
  1068. /**
  1069. * Retrieves the h/v location of the current, or specified,
  1070. * slide.
  1071. *
  1072. * @param {HTMLElement} slide If specified, the returned
  1073. * index will be for this slide rather than the currently
  1074. * active one
  1075. *
  1076. * @return {Object} { h: <int>, v: <int> }
  1077. */
  1078. function getIndices( slide ) {
  1079. // By default, return the current indices
  1080. var h = indexh,
  1081. v = indexv;
  1082. // If a slide is specified, return the indices of that slide
  1083. if( slide ) {
  1084. var isVertical = !!slide.parentNode.nodeName.match( /section/gi );
  1085. var slideh = isVertical ? slide.parentNode : slide;
  1086. // Select all horizontal slides
  1087. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1088. // Now that we know which the horizontal slide is, get its index
  1089. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  1090. // If this is a vertical slide, grab the vertical index
  1091. if( isVertical ) {
  1092. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  1093. }
  1094. }
  1095. return { h: h, v: v };
  1096. }
  1097. /**
  1098. * Navigate to the next slide fragment.
  1099. *
  1100. * @return {Boolean} true if there was a next fragment,
  1101. * false otherwise
  1102. */
  1103. function nextFragment() {
  1104. // Vertical slides:
  1105. if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
  1106. var verticalFragments = sortFragments( document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' ) );
  1107. if( verticalFragments.length ) {
  1108. verticalFragments[0].classList.add( 'visible' );
  1109. // Notify subscribers of the change
  1110. dispatchEvent( 'fragmentshown', { fragment: verticalFragments[0] } );
  1111. return true;
  1112. }
  1113. }
  1114. // Horizontal slides:
  1115. else {
  1116. var horizontalFragments = sortFragments( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' ) );
  1117. if( horizontalFragments.length ) {
  1118. horizontalFragments[0].classList.add( 'visible' );
  1119. // Notify subscribers of the change
  1120. dispatchEvent( 'fragmentshown', { fragment: horizontalFragments[0] } );
  1121. return true;
  1122. }
  1123. }
  1124. return false;
  1125. }
  1126. /**
  1127. * Navigate to the previous slide fragment.
  1128. *
  1129. * @return {Boolean} true if there was a previous fragment,
  1130. * false otherwise
  1131. */
  1132. function previousFragment() {
  1133. // Vertical slides:
  1134. if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
  1135. var verticalFragments = sortFragments( document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment.visible' ) );
  1136. if( verticalFragments.length ) {
  1137. verticalFragments[ verticalFragments.length - 1 ].classList.remove( 'visible' );
  1138. // Notify subscribers of the change
  1139. dispatchEvent( 'fragmenthidden', { fragment: verticalFragments[ verticalFragments.length - 1 ] } );
  1140. return true;
  1141. }
  1142. }
  1143. // Horizontal slides:
  1144. else {
  1145. var horizontalFragments = sortFragments( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment.visible' ) );
  1146. if( horizontalFragments.length ) {
  1147. horizontalFragments[ horizontalFragments.length - 1 ].classList.remove( 'visible' );
  1148. // Notify subscribers of the change
  1149. dispatchEvent( 'fragmenthidden', { fragment: horizontalFragments[ horizontalFragments.length - 1 ] } );
  1150. return true;
  1151. }
  1152. }
  1153. return false;
  1154. }
  1155. /**
  1156. * Cues a new automated slide if enabled in the config.
  1157. */
  1158. function cueAutoSlide() {
  1159. clearTimeout( autoSlideTimeout );
  1160. // Cue the next auto-slide if enabled
  1161. if( autoSlide && !isPaused() && !isOverview() ) {
  1162. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  1163. }
  1164. }
  1165. /**
  1166. * Cancels any ongoing request to auto-slide.
  1167. */
  1168. function cancelAutoSlide() {
  1169. clearTimeout( autoSlideTimeout );
  1170. }
  1171. function navigateLeft() {
  1172. // Prioritize hiding fragments
  1173. if( availableRoutes().left && isOverview() || previousFragment() === false ) {
  1174. slide( indexh - 1 );
  1175. }
  1176. }
  1177. function navigateRight() {
  1178. // Prioritize revealing fragments
  1179. if( availableRoutes().right && isOverview() || nextFragment() === false ) {
  1180. slide( indexh + 1 );
  1181. }
  1182. }
  1183. function navigateUp() {
  1184. // Prioritize hiding fragments
  1185. if( availableRoutes().up && isOverview() || previousFragment() === false ) {
  1186. slide( indexh, indexv - 1 );
  1187. }
  1188. }
  1189. function navigateDown() {
  1190. // Prioritize revealing fragments
  1191. if( availableRoutes().down && isOverview() || nextFragment() === false ) {
  1192. slide( indexh, indexv + 1 );
  1193. }
  1194. }
  1195. /**
  1196. * Navigates backwards, prioritized in the following order:
  1197. * 1) Previous fragment
  1198. * 2) Previous vertical slide
  1199. * 3) Previous horizontal slide
  1200. */
  1201. function navigatePrev() {
  1202. // Prioritize revealing fragments
  1203. if( previousFragment() === false ) {
  1204. if( availableRoutes().up ) {
  1205. navigateUp();
  1206. }
  1207. else {
  1208. // Fetch the previous horizontal slide, if there is one
  1209. var previousSlide = document.querySelector( HORIZONTAL_SLIDES_SELECTOR + '.past:nth-child(' + indexh + ')' );
  1210. if( previousSlide ) {
  1211. indexv = ( previousSlide.querySelectorAll( 'section' ).length + 1 ) || undefined;
  1212. indexh --;
  1213. slide();
  1214. }
  1215. }
  1216. }
  1217. }
  1218. /**
  1219. * Same as #navigatePrev() but navigates forwards.
  1220. */
  1221. function navigateNext() {
  1222. // Prioritize revealing fragments
  1223. if( nextFragment() === false ) {
  1224. availableRoutes().down ? navigateDown() : navigateRight();
  1225. }
  1226. // If auto-sliding is enabled we need to cue up
  1227. // another timeout
  1228. cueAutoSlide();
  1229. }
  1230. // --------------------------------------------------------------------//
  1231. // ----------------------------- EVENTS -------------------------------//
  1232. // --------------------------------------------------------------------//
  1233. /**
  1234. * Handler for the document level 'keydown' event.
  1235. *
  1236. * @param {Object} event
  1237. */
  1238. function onDocumentKeyDown( event ) {
  1239. // Check if there's a focused element that could be using
  1240. // the keyboard
  1241. var activeElement = document.activeElement;
  1242. var hasFocus = !!( document.activeElement && ( document.activeElement.type || document.activeElement.href || document.activeElement.contentEditable !== 'inherit' ) );
  1243. // Disregard the event if there's a focused element or a
  1244. // keyboard modifier key is present
  1245. if( hasFocus || event.shiftKey || event.altKey || event.ctrlKey || event.metaKey ) return;
  1246. var triggered = true;
  1247. // while paused only allow "unpausing" keyboard events (b and .)
  1248. if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) {
  1249. return false;
  1250. }
  1251. switch( event.keyCode ) {
  1252. // p, page up
  1253. case 80: case 33: navigatePrev(); break;
  1254. // n, page down
  1255. case 78: case 34: navigateNext(); break;
  1256. // h, left
  1257. case 72: case 37: navigateLeft(); break;
  1258. // l, right
  1259. case 76: case 39: navigateRight(); break;
  1260. // k, up
  1261. case 75: case 38: navigateUp(); break;
  1262. // j, down
  1263. case 74: case 40: navigateDown(); break;
  1264. // home
  1265. case 36: slide( 0 ); break;
  1266. // end
  1267. case 35: slide( Number.MAX_VALUE ); break;
  1268. // space
  1269. case 32: isOverview() ? deactivateOverview() : navigateNext(); break;
  1270. // return
  1271. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  1272. // b, period, Logitech presenter tools "black screen" button
  1273. case 66: case 190: case 191: togglePause(); break;
  1274. // f
  1275. case 70: enterFullscreen(); break;
  1276. default:
  1277. triggered = false;
  1278. }
  1279. // If the input resulted in a triggered action we should prevent
  1280. // the browsers default behavior
  1281. if( triggered ) {
  1282. event.preventDefault();
  1283. }
  1284. else if ( event.keyCode === 27 && supports3DTransforms ) {
  1285. toggleOverview();
  1286. event.preventDefault();
  1287. }
  1288. // If auto-sliding is enabled we need to cue up
  1289. // another timeout
  1290. cueAutoSlide();
  1291. }
  1292. /**
  1293. * Handler for the document level 'touchstart' event,
  1294. * enables support for swipe and pinch gestures.
  1295. */
  1296. function onDocumentTouchStart( event ) {
  1297. touch.startX = event.touches[0].clientX;
  1298. touch.startY = event.touches[0].clientY;
  1299. touch.startCount = event.touches.length;
  1300. // If there's two touches we need to memorize the distance
  1301. // between those two points to detect pinching
  1302. if( event.touches.length === 2 && config.overview ) {
  1303. touch.startSpan = distanceBetween( {
  1304. x: event.touches[1].clientX,
  1305. y: event.touches[1].clientY
  1306. }, {
  1307. x: touch.startX,
  1308. y: touch.startY
  1309. } );
  1310. }
  1311. }
  1312. /**
  1313. * Handler for the document level 'touchmove' event.
  1314. */
  1315. function onDocumentTouchMove( event ) {
  1316. // Each touch should only trigger one action
  1317. if( !touch.handled ) {
  1318. var currentX = event.touches[0].clientX;
  1319. var currentY = event.touches[0].clientY;
  1320. // If the touch started off with two points and still has
  1321. // two active touches; test for the pinch gesture
  1322. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  1323. // The current distance in pixels between the two touch points
  1324. var currentSpan = distanceBetween( {
  1325. x: event.touches[1].clientX,
  1326. y: event.touches[1].clientY
  1327. }, {
  1328. x: touch.startX,
  1329. y: touch.startY
  1330. } );
  1331. // If the span is larger than the desire amount we've got
  1332. // ourselves a pinch
  1333. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  1334. touch.handled = true;
  1335. if( currentSpan < touch.startSpan ) {
  1336. activateOverview();
  1337. }
  1338. else {
  1339. deactivateOverview();
  1340. }
  1341. }
  1342. event.preventDefault();
  1343. }
  1344. // There was only one touch point, look for a swipe
  1345. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  1346. var deltaX = currentX - touch.startX,
  1347. deltaY = currentY - touch.startY;
  1348. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  1349. touch.handled = true;
  1350. navigateLeft();
  1351. }
  1352. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  1353. touch.handled = true;
  1354. navigateRight();
  1355. }
  1356. else if( deltaY > touch.threshold ) {
  1357. touch.handled = true;
  1358. navigateUp();
  1359. }
  1360. else if( deltaY < -touch.threshold ) {
  1361. touch.handled = true;
  1362. navigateDown();
  1363. }
  1364. event.preventDefault();
  1365. }
  1366. }
  1367. // There's a bug with swiping on some Android devices unless
  1368. // the default action is always prevented
  1369. else if( navigator.userAgent.match( /android/gi ) ) {
  1370. event.preventDefault();
  1371. }
  1372. }
  1373. /**
  1374. * Handler for the document level 'touchend' event.
  1375. */
  1376. function onDocumentTouchEnd( event ) {
  1377. touch.handled = false;
  1378. }
  1379. /**
  1380. * Handles mouse wheel scrolling, throttled to avoid skipping
  1381. * multiple slides.
  1382. */
  1383. function onDocumentMouseScroll( event ) {
  1384. clearTimeout( mouseWheelTimeout );
  1385. mouseWheelTimeout = setTimeout( function() {
  1386. var delta = event.detail || -event.wheelDelta;
  1387. if( delta > 0 ) {
  1388. navigateNext();
  1389. }
  1390. else {
  1391. navigatePrev();
  1392. }
  1393. }, 100 );
  1394. }
  1395. /**
  1396. * Clicking on the progress bar results in a navigation to the
  1397. * closest approximate horizontal slide using this equation:
  1398. *
  1399. * ( clickX / presentationWidth ) * numberOfSlides
  1400. */
  1401. function onProgressClicked( event ) {
  1402. event.preventDefault();
  1403. var slidesTotal = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  1404. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  1405. slide( slideIndex );
  1406. }
  1407. /**
  1408. * Event handler for navigation control buttons.
  1409. */
  1410. function onNavigateLeftClicked( event ) { event.preventDefault(); navigateLeft(); }
  1411. function onNavigateRightClicked( event ) { event.preventDefault(); navigateRight(); }
  1412. function onNavigateUpClicked( event ) { event.preventDefault(); navigateUp(); }
  1413. function onNavigateDownClicked( event ) { event.preventDefault(); navigateDown(); }
  1414. function onNavigatePrevClicked( event ) { event.preventDefault(); navigatePrev(); }
  1415. function onNavigateNextClicked( event ) { event.preventDefault(); navigateNext(); }
  1416. /**
  1417. * Handler for the window level 'hashchange' event.
  1418. */
  1419. function onWindowHashChange( event ) {
  1420. readURL();
  1421. }
  1422. /**
  1423. * Handler for the window level 'resize' event.
  1424. */
  1425. function onWindowResize( event ) {
  1426. layout();
  1427. }
  1428. /**
  1429. * Invoked when a slide is and we're in the overview.
  1430. */
  1431. function onOverviewSlideClicked( event ) {
  1432. // TODO There's a bug here where the event listeners are not
  1433. // removed after deactivating the overview.
  1434. if( eventsAreBound && isOverview() ) {
  1435. event.preventDefault();
  1436. var element = event.target;
  1437. while( element && !element.nodeName.match( /section/gi ) ) {
  1438. element = element.parentNode;
  1439. }
  1440. if( element && !element.classList.contains( 'disabled' ) ) {
  1441. deactivateOverview();
  1442. if( element.nodeName.match( /section/gi ) ) {
  1443. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  1444. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  1445. slide( h, v );
  1446. }
  1447. }
  1448. }
  1449. }
  1450. // --------------------------------------------------------------------//
  1451. // ------------------------------- API --------------------------------//
  1452. // --------------------------------------------------------------------//
  1453. return {
  1454. initialize: initialize,
  1455. configure: configure,
  1456. // Navigation methods
  1457. slide: slide,
  1458. left: navigateLeft,
  1459. right: navigateRight,
  1460. up: navigateUp,
  1461. down: navigateDown,
  1462. prev: navigatePrev,
  1463. next: navigateNext,
  1464. prevFragment: previousFragment,
  1465. nextFragment: nextFragment,
  1466. // Deprecated aliases
  1467. navigateTo: slide,
  1468. navigateLeft: navigateLeft,
  1469. navigateRight: navigateRight,
  1470. navigateUp: navigateUp,
  1471. navigateDown: navigateDown,
  1472. navigatePrev: navigatePrev,
  1473. navigateNext: navigateNext,
  1474. // Forces an update in slide layout
  1475. layout: layout,
  1476. // Toggles the overview mode on/off
  1477. toggleOverview: toggleOverview,
  1478. // Toggles the "black screen" mode on/off
  1479. togglePause: togglePause,
  1480. // State checks
  1481. isOverview: isOverview,
  1482. isPaused: isPaused,
  1483. // Adds or removes all internal event listeners (such as keyboard)
  1484. addEventListeners: addEventListeners,
  1485. removeEventListeners: removeEventListeners,
  1486. // Returns the indices of the current, or specified, slide
  1487. getIndices: getIndices,
  1488. // Returns the slide at the specified index, y is optional
  1489. getSlide: function( x, y ) {
  1490. var horizontalSlide = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  1491. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  1492. if( typeof y !== 'undefined' ) {
  1493. return verticalSlides ? verticalSlides[ y ] : undefined;
  1494. }
  1495. return horizontalSlide;
  1496. },
  1497. // Returns the previous slide element, may be null
  1498. getPreviousSlide: function() {
  1499. return previousSlide;
  1500. },
  1501. // Returns the current slide element
  1502. getCurrentSlide: function() {
  1503. return currentSlide;
  1504. },
  1505. // Returns the current scale of the presentation content
  1506. getScale: function() {
  1507. return scale;
  1508. },
  1509. // Helper method, retrieves query string as a key/value hash
  1510. getQueryHash: function() {
  1511. var query = {};
  1512. location.search.replace( /[A-Z0-9]+?=(\w*)/gi, function(a) {
  1513. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  1514. } );
  1515. return query;
  1516. },
  1517. // Returns true if we're currently on the first slide
  1518. isFirstSlide: function() {
  1519. return document.querySelector( SLIDES_SELECTOR + '.past' ) == null ? true : false;
  1520. },
  1521. // Returns true if we're currently on the last slide
  1522. isLastSlide: function() {
  1523. if( currentSlide && currentSlide.classList.contains( '.stack' ) ) {
  1524. return currentSlide.querySelector( SLIDES_SELECTOR + '.future' ) == null ? true : false;
  1525. }
  1526. else {
  1527. return document.querySelector( SLIDES_SELECTOR + '.future' ) == null ? true : false;
  1528. }
  1529. },
  1530. // Forward event binding to the reveal DOM element
  1531. addEventListener: function( type, listener, useCapture ) {
  1532. if( 'addEventListener' in window ) {
  1533. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  1534. }
  1535. },
  1536. removeEventListener: function( type, listener, useCapture ) {
  1537. if( 'addEventListener' in window ) {
  1538. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  1539. }
  1540. }
  1541. };
  1542. })();