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