reveal.js 74 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. // Layout the contents of the slides
  760. layoutSlideContents( config.width, config.height, slidePadding );
  761. // Slide width may be a percentage of available width
  762. if( typeof slideWidth === 'string' && /%$/.test( slideWidth ) ) {
  763. slideWidth = parseInt( slideWidth, 10 ) / 100 * availableWidth;
  764. }
  765. // Slide height may be a percentage of available height
  766. if( typeof slideHeight === 'string' && /%$/.test( slideHeight ) ) {
  767. slideHeight = parseInt( slideHeight, 10 ) / 100 * availableHeight;
  768. }
  769. dom.slides.style.width = slideWidth + 'px';
  770. dom.slides.style.height = slideHeight + 'px';
  771. // Determine scale of content to fit within available space
  772. scale = Math.min( availableWidth / slideWidth, availableHeight / slideHeight );
  773. // Respect max/min scale settings
  774. scale = Math.max( scale, config.minScale );
  775. scale = Math.min( scale, config.maxScale );
  776. // Prefer applying scale via zoom since Chrome blurs scaled content
  777. // with nested transforms
  778. if( typeof dom.slides.style.zoom !== 'undefined' && !navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi ) ) {
  779. dom.slides.style.zoom = scale;
  780. }
  781. // Apply scale transform as a fallback
  782. else {
  783. transformElement( dom.slides, 'translate(-50%, -50%) scale('+ scale +') translate(50%, 50%)' );
  784. }
  785. // Select all slides, vertical and horizontal
  786. var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
  787. for( var i = 0, len = slides.length; i < len; i++ ) {
  788. var slide = slides[ i ];
  789. // Don't bother updating invisible slides
  790. if( slide.style.display === 'none' ) {
  791. continue;
  792. }
  793. if( config.center ) {
  794. // Vertical stacks are not centred since their section
  795. // children will be
  796. if( slide.classList.contains( 'stack' ) ) {
  797. slide.style.top = 0;
  798. }
  799. else {
  800. slide.style.top = Math.max( - ( getAbsoluteHeight( slide ) / 2 ) - slidePadding, -slideHeight / 2 ) + 'px';
  801. }
  802. }
  803. else {
  804. slide.style.top = '';
  805. }
  806. }
  807. updateProgress();
  808. }
  809. }
  810. /**
  811. * Applies layout logic to the contents of all slides in
  812. * the presentation.
  813. */
  814. function layoutSlideContents( width, height, padding ) {
  815. // Handle sizing of elements with the 'stretch' class
  816. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  817. // Determine how much vertical space we can use
  818. var remainingHeight = getRemainingHeight( element, ( height - ( padding * 2 ) ) );
  819. // Consider the aspect ratio of media elements
  820. if( /(img|video)/gi.test( element.nodeName ) ) {
  821. var nw = element.naturalWidth || element.videoWidth,
  822. nh = element.naturalHeight || element.videoHeight;
  823. var es = Math.min( width / nw, remainingHeight / nh );
  824. element.style.width = ( nw * es ) + 'px';
  825. element.style.height = ( nh * es ) + 'px';
  826. }
  827. else {
  828. element.style.width = width + 'px';
  829. element.style.height = remainingHeight + 'px';
  830. }
  831. } );
  832. }
  833. /**
  834. * Stores the vertical index of a stack so that the same
  835. * vertical slide can be selected when navigating to and
  836. * from the stack.
  837. *
  838. * @param {HTMLElement} stack The vertical stack element
  839. * @param {int} v Index to memorize
  840. */
  841. function setPreviousVerticalIndex( stack, v ) {
  842. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  843. stack.setAttribute( 'data-previous-indexv', v || 0 );
  844. }
  845. }
  846. /**
  847. * Retrieves the vertical index which was stored using
  848. * #setPreviousVerticalIndex() or 0 if no previous index
  849. * exists.
  850. *
  851. * @param {HTMLElement} stack The vertical stack element
  852. */
  853. function getPreviousVerticalIndex( stack ) {
  854. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  855. // Prefer manually defined start-indexv
  856. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  857. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  858. }
  859. return 0;
  860. }
  861. /**
  862. * Displays the overview of slides (quick nav) by
  863. * scaling down and arranging all slide elements.
  864. *
  865. * Experimental feature, might be dropped if perf
  866. * can't be improved.
  867. */
  868. function activateOverview() {
  869. // Only proceed if enabled in config
  870. if( config.overview ) {
  871. // Don't auto-slide while in overview mode
  872. cancelAutoSlide();
  873. var wasActive = dom.wrapper.classList.contains( 'overview' );
  874. // Vary the depth of the overview based on screen size
  875. var depth = window.innerWidth < 400 ? 1000 : 2500;
  876. dom.wrapper.classList.add( 'overview' );
  877. dom.wrapper.classList.remove( 'exit-overview' );
  878. clearTimeout( activateOverviewTimeout );
  879. clearTimeout( deactivateOverviewTimeout );
  880. // Not the pretties solution, but need to let the overview
  881. // class apply first so that slides are measured accurately
  882. // before we can position them
  883. activateOverviewTimeout = setTimeout( function(){
  884. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  885. for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
  886. var hslide = horizontalSlides[i],
  887. hoffset = config.rtl ? -105 : 105;
  888. hslide.setAttribute( 'data-index-h', i );
  889. // Apply CSS transform
  890. transformElement( hslide, 'translateZ(-'+ depth +'px) translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)' );
  891. if( hslide.classList.contains( 'stack' ) ) {
  892. var verticalSlides = hslide.querySelectorAll( 'section' );
  893. for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
  894. var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );
  895. var vslide = verticalSlides[j];
  896. vslide.setAttribute( 'data-index-h', i );
  897. vslide.setAttribute( 'data-index-v', j );
  898. // Apply CSS transform
  899. transformElement( vslide, 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)' );
  900. // Navigate to this slide on click
  901. vslide.addEventListener( 'click', onOverviewSlideClicked, true );
  902. }
  903. }
  904. else {
  905. // Navigate to this slide on click
  906. hslide.addEventListener( 'click', onOverviewSlideClicked, true );
  907. }
  908. }
  909. updateSlidesVisibility();
  910. layout();
  911. if( !wasActive ) {
  912. // Notify observers of the overview showing
  913. dispatchEvent( 'overviewshown', {
  914. 'indexh': indexh,
  915. 'indexv': indexv,
  916. 'currentSlide': currentSlide
  917. } );
  918. }
  919. }, 10 );
  920. }
  921. }
  922. /**
  923. * Exits the slide overview and enters the currently
  924. * active slide.
  925. */
  926. function deactivateOverview() {
  927. // Only proceed if enabled in config
  928. if( config.overview ) {
  929. clearTimeout( activateOverviewTimeout );
  930. clearTimeout( deactivateOverviewTimeout );
  931. dom.wrapper.classList.remove( 'overview' );
  932. // Temporarily add a class so that transitions can do different things
  933. // depending on whether they are exiting/entering overview, or just
  934. // moving from slide to slide
  935. dom.wrapper.classList.add( 'exit-overview' );
  936. deactivateOverviewTimeout = setTimeout( function () {
  937. dom.wrapper.classList.remove( 'exit-overview' );
  938. }, 10);
  939. // Select all slides
  940. var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
  941. for( var i = 0, len = slides.length; i < len; i++ ) {
  942. var element = slides[i];
  943. element.style.display = '';
  944. // Resets all transforms to use the external styles
  945. transformElement( element, '' );
  946. element.removeEventListener( 'click', onOverviewSlideClicked, true );
  947. }
  948. slide( indexh, indexv );
  949. cueAutoSlide();
  950. // Notify observers of the overview hiding
  951. dispatchEvent( 'overviewhidden', {
  952. 'indexh': indexh,
  953. 'indexv': indexv,
  954. 'currentSlide': currentSlide
  955. } );
  956. }
  957. }
  958. /**
  959. * Toggles the slide overview mode on and off.
  960. *
  961. * @param {Boolean} override Optional flag which overrides the
  962. * toggle logic and forcibly sets the desired state. True means
  963. * overview is open, false means it's closed.
  964. */
  965. function toggleOverview( override ) {
  966. if( typeof override === 'boolean' ) {
  967. override ? activateOverview() : deactivateOverview();
  968. }
  969. else {
  970. isOverview() ? deactivateOverview() : activateOverview();
  971. }
  972. }
  973. /**
  974. * Checks if the overview is currently active.
  975. *
  976. * @return {Boolean} true if the overview is active,
  977. * false otherwise
  978. */
  979. function isOverview() {
  980. return dom.wrapper.classList.contains( 'overview' );
  981. }
  982. /**
  983. * Checks if the current or specified slide is vertical
  984. * (nested within another slide).
  985. *
  986. * @param {HTMLElement} slide [optional] The slide to check
  987. * orientation of
  988. */
  989. function isVerticalSlide( slide ) {
  990. // Prefer slide argument, otherwise use current slide
  991. slide = slide ? slide : currentSlide;
  992. return slide && !!slide.parentNode.nodeName.match( /section/i );
  993. }
  994. /**
  995. * Handling the fullscreen functionality via the fullscreen API
  996. *
  997. * @see http://fullscreen.spec.whatwg.org/
  998. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  999. */
  1000. function enterFullscreen() {
  1001. var element = document.body;
  1002. // Check which implementation is available
  1003. var requestMethod = element.requestFullScreen ||
  1004. element.webkitRequestFullscreen ||
  1005. element.webkitRequestFullScreen ||
  1006. element.mozRequestFullScreen ||
  1007. element.msRequestFullScreen;
  1008. if( requestMethod ) {
  1009. requestMethod.apply( element );
  1010. }
  1011. }
  1012. /**
  1013. * Enters the paused mode which fades everything on screen to
  1014. * black.
  1015. */
  1016. function pause() {
  1017. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1018. cancelAutoSlide();
  1019. dom.wrapper.classList.add( 'paused' );
  1020. if( wasPaused === false ) {
  1021. dispatchEvent( 'paused' );
  1022. }
  1023. }
  1024. /**
  1025. * Exits from the paused mode.
  1026. */
  1027. function resume() {
  1028. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1029. dom.wrapper.classList.remove( 'paused' );
  1030. cueAutoSlide();
  1031. if( wasPaused ) {
  1032. dispatchEvent( 'resumed' );
  1033. }
  1034. }
  1035. /**
  1036. * Toggles the paused mode on and off.
  1037. */
  1038. function togglePause() {
  1039. if( isPaused() ) {
  1040. resume();
  1041. }
  1042. else {
  1043. pause();
  1044. }
  1045. }
  1046. /**
  1047. * Checks if we are currently in the paused mode.
  1048. */
  1049. function isPaused() {
  1050. return dom.wrapper.classList.contains( 'paused' );
  1051. }
  1052. /**
  1053. * Steps from the current point in the presentation to the
  1054. * slide which matches the specified horizontal and vertical
  1055. * indices.
  1056. *
  1057. * @param {int} h Horizontal index of the target slide
  1058. * @param {int} v Vertical index of the target slide
  1059. * @param {int} f Optional index of a fragment within the
  1060. * target slide to activate
  1061. * @param {int} o Optional origin for use in multimaster environments
  1062. */
  1063. function slide( h, v, f, o ) {
  1064. // Remember where we were at before
  1065. previousSlide = currentSlide;
  1066. // Query all horizontal slides in the deck
  1067. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1068. // If no vertical index is specified and the upcoming slide is a
  1069. // stack, resume at its previous vertical index
  1070. if( v === undefined ) {
  1071. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1072. }
  1073. // If we were on a vertical stack, remember what vertical index
  1074. // it was on so we can resume at the same position when returning
  1075. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1076. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1077. }
  1078. // Remember the state before this slide
  1079. var stateBefore = state.concat();
  1080. // Reset the state array
  1081. state.length = 0;
  1082. var indexhBefore = indexh || 0,
  1083. indexvBefore = indexv || 0;
  1084. // Activate and transition to the new slide
  1085. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1086. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1087. // Update the visibility of slides now that the indices have changed
  1088. updateSlidesVisibility();
  1089. layout();
  1090. // Apply the new state
  1091. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1092. // Check if this state existed on the previous slide. If it
  1093. // did, we will avoid adding it repeatedly
  1094. for( var j = 0; j < stateBefore.length; j++ ) {
  1095. if( stateBefore[j] === state[i] ) {
  1096. stateBefore.splice( j, 1 );
  1097. continue stateLoop;
  1098. }
  1099. }
  1100. document.documentElement.classList.add( state[i] );
  1101. // Dispatch custom event matching the state's name
  1102. dispatchEvent( state[i] );
  1103. }
  1104. // Clean up the remains of the previous state
  1105. while( stateBefore.length ) {
  1106. document.documentElement.classList.remove( stateBefore.pop() );
  1107. }
  1108. // If the overview is active, re-activate it to update positions
  1109. if( isOverview() ) {
  1110. activateOverview();
  1111. }
  1112. // Find the current horizontal slide and any possible vertical slides
  1113. // within it
  1114. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1115. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1116. // Store references to the previous and current slides
  1117. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1118. // Show fragment, if specified
  1119. if( typeof f !== 'undefined' ) {
  1120. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  1121. toArray( fragments ).forEach( function( fragment, indexf ) {
  1122. if( indexf < f ) {
  1123. fragment.classList.add( 'visible' );
  1124. }
  1125. else {
  1126. fragment.classList.remove( 'visible' );
  1127. }
  1128. } );
  1129. }
  1130. // Dispatch an event if the slide changed
  1131. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1132. if( slideChanged ) {
  1133. dispatchEvent( 'slidechanged', {
  1134. 'indexh': indexh,
  1135. 'indexv': indexv,
  1136. 'previousSlide': previousSlide,
  1137. 'currentSlide': currentSlide,
  1138. 'origin': o
  1139. } );
  1140. }
  1141. else {
  1142. // Ensure that the previous slide is never the same as the current
  1143. previousSlide = null;
  1144. }
  1145. // Solves an edge case where the previous slide maintains the
  1146. // 'present' class when navigating between adjacent vertical
  1147. // stacks
  1148. if( previousSlide ) {
  1149. previousSlide.classList.remove( 'present' );
  1150. // Reset all slides upon navigate to home
  1151. // Issue: #285
  1152. if ( document.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1153. // Launch async task
  1154. setTimeout( function () {
  1155. var slides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1156. for( i in slides ) {
  1157. if( slides[i] ) {
  1158. // Reset stack
  1159. setPreviousVerticalIndex( slides[i], 0 );
  1160. }
  1161. }
  1162. }, 0 );
  1163. }
  1164. }
  1165. // Handle embedded content
  1166. if( slideChanged ) {
  1167. stopEmbeddedContent( previousSlide );
  1168. startEmbeddedContent( currentSlide );
  1169. }
  1170. updateControls();
  1171. updateProgress();
  1172. updateBackground();
  1173. // Update the URL hash
  1174. writeURL();
  1175. }
  1176. /**
  1177. * Syncs the presentation with the current DOM. Useful
  1178. * when new slides or control elements are added or when
  1179. * the configuration has changed.
  1180. */
  1181. function sync() {
  1182. // Subscribe to input
  1183. removeEventListeners();
  1184. addEventListeners();
  1185. // Force a layout to make sure the current config is accounted for
  1186. layout();
  1187. // Reflect the current autoSlide value
  1188. autoSlide = config.autoSlide;
  1189. // Start auto-sliding if it's enabled
  1190. cueAutoSlide();
  1191. // Re-create the slide backgrounds
  1192. createBackgrounds();
  1193. updateControls();
  1194. updateProgress();
  1195. updateBackground();
  1196. }
  1197. /**
  1198. * Updates one dimension of slides by showing the slide
  1199. * with the specified index.
  1200. *
  1201. * @param {String} selector A CSS selector that will fetch
  1202. * the group of slides we are working with
  1203. * @param {Number} index The index of the slide that should be
  1204. * shown
  1205. *
  1206. * @return {Number} The index of the slide that is now shown,
  1207. * might differ from the passed in index if it was out of
  1208. * bounds.
  1209. */
  1210. function updateSlides( selector, index ) {
  1211. // Select all slides and convert the NodeList result to
  1212. // an array
  1213. var slides = toArray( document.querySelectorAll( selector ) ),
  1214. slidesLength = slides.length;
  1215. if( slidesLength ) {
  1216. // Should the index loop?
  1217. if( config.loop ) {
  1218. index %= slidesLength;
  1219. if( index < 0 ) {
  1220. index = slidesLength + index;
  1221. }
  1222. }
  1223. // Enforce max and minimum index bounds
  1224. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1225. for( var i = 0; i < slidesLength; i++ ) {
  1226. var element = slides[i];
  1227. var reverse = config.rtl && !isVerticalSlide( element );
  1228. element.classList.remove( 'past' );
  1229. element.classList.remove( 'present' );
  1230. element.classList.remove( 'future' );
  1231. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1232. element.setAttribute( 'hidden', '' );
  1233. if( i < index ) {
  1234. // Any element previous to index is given the 'past' class
  1235. element.classList.add( reverse ? 'future' : 'past' );
  1236. }
  1237. else if( i > index ) {
  1238. // Any element subsequent to index is given the 'future' class
  1239. element.classList.add( reverse ? 'past' : 'future' );
  1240. var fragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1241. // No fragments in future slides should be visible ahead of time
  1242. while( fragments.length ) {
  1243. fragments.pop().classList.remove( 'visible' );
  1244. }
  1245. }
  1246. // If this element contains vertical slides
  1247. if( element.querySelector( 'section' ) ) {
  1248. element.classList.add( 'stack' );
  1249. }
  1250. }
  1251. // Mark the current slide as present
  1252. slides[index].classList.add( 'present' );
  1253. slides[index].removeAttribute( 'hidden' );
  1254. // If this slide has a state associated with it, add it
  1255. // onto the current state of the deck
  1256. var slideState = slides[index].getAttribute( 'data-state' );
  1257. if( slideState ) {
  1258. state = state.concat( slideState.split( ' ' ) );
  1259. }
  1260. // If this slide has a data-autoslide attribute associated use this as
  1261. // autoSlide value otherwise use the global configured time
  1262. var slideAutoSlide = slides[index].getAttribute( 'data-autoslide' );
  1263. if( slideAutoSlide ) {
  1264. autoSlide = parseInt( slideAutoSlide, 10 );
  1265. }
  1266. else {
  1267. autoSlide = config.autoSlide;
  1268. }
  1269. cueAutoSlide();
  1270. }
  1271. else {
  1272. // Since there are no slides we can't be anywhere beyond the
  1273. // zeroth index
  1274. index = 0;
  1275. }
  1276. return index;
  1277. }
  1278. /**
  1279. * Optimization method; hide all slides that are far away
  1280. * from the present slide.
  1281. */
  1282. function updateSlidesVisibility() {
  1283. // Select all slides and convert the NodeList result to
  1284. // an array
  1285. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1286. horizontalSlidesLength = horizontalSlides.length,
  1287. distanceX,
  1288. distanceY;
  1289. if( horizontalSlidesLength ) {
  1290. // The number of steps away from the present slide that will
  1291. // be visible
  1292. var viewDistance = isOverview() ? 10 : config.viewDistance;
  1293. // Limit view distance on weaker devices
  1294. if( isMobileDevice ) {
  1295. viewDistance = isOverview() ? 6 : 1;
  1296. }
  1297. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1298. var horizontalSlide = horizontalSlides[x];
  1299. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1300. verticalSlidesLength = verticalSlides.length;
  1301. // Loops so that it measures 1 between the first and last slides
  1302. distanceX = Math.abs( ( indexh - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1303. // Show the horizontal slide if it's within the view distance
  1304. horizontalSlide.style.display = distanceX > viewDistance ? 'none' : 'block';
  1305. if( verticalSlidesLength ) {
  1306. var oy = getPreviousVerticalIndex( horizontalSlide );
  1307. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1308. var verticalSlide = verticalSlides[y];
  1309. distanceY = x === indexh ? Math.abs( indexv - y ) : Math.abs( y - oy );
  1310. verticalSlide.style.display = ( distanceX + distanceY ) > viewDistance ? 'none' : 'block';
  1311. }
  1312. }
  1313. }
  1314. }
  1315. }
  1316. /**
  1317. * Updates the progress bar to reflect the current slide.
  1318. */
  1319. function updateProgress() {
  1320. // Update progress if enabled
  1321. if( config.progress && dom.progress ) {
  1322. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1323. // The number of past and total slides
  1324. var totalCount = document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  1325. var pastCount = 0;
  1326. // Step through all slides and count the past ones
  1327. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  1328. var horizontalSlide = horizontalSlides[i];
  1329. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1330. for( var j = 0; j < verticalSlides.length; j++ ) {
  1331. // Stop as soon as we arrive at the present
  1332. if( verticalSlides[j].classList.contains( 'present' ) ) {
  1333. break mainLoop;
  1334. }
  1335. pastCount++;
  1336. }
  1337. // Stop as soon as we arrive at the present
  1338. if( horizontalSlide.classList.contains( 'present' ) ) {
  1339. break;
  1340. }
  1341. // Don't count the wrapping section for vertical slides
  1342. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  1343. pastCount++;
  1344. }
  1345. }
  1346. dom.progressbar.style.width = ( pastCount / ( totalCount - 1 ) ) * window.innerWidth + 'px';
  1347. }
  1348. }
  1349. /**
  1350. * Updates the state of all control/navigation arrows.
  1351. */
  1352. function updateControls() {
  1353. if ( config.controls && dom.controls ) {
  1354. var routes = availableRoutes();
  1355. var fragments = availableFragments();
  1356. // Remove the 'enabled' class from all directions
  1357. dom.controlsLeft.concat( dom.controlsRight )
  1358. .concat( dom.controlsUp )
  1359. .concat( dom.controlsDown )
  1360. .concat( dom.controlsPrev )
  1361. .concat( dom.controlsNext ).forEach( function( node ) {
  1362. node.classList.remove( 'enabled' );
  1363. node.classList.remove( 'fragmented' );
  1364. } );
  1365. // Add the 'enabled' class to the available routes
  1366. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1367. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1368. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1369. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1370. // Prev/next buttons
  1371. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1372. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
  1373. // Highlight fragment directions
  1374. if( currentSlide ) {
  1375. // Always apply fragment decorator to prev/next buttons
  1376. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1377. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1378. // Apply fragment decorators to directional buttons based on
  1379. // what slide axis they are in
  1380. if( isVerticalSlide( currentSlide ) ) {
  1381. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1382. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1383. }
  1384. else {
  1385. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1386. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
  1387. }
  1388. }
  1389. }
  1390. }
  1391. /**
  1392. * Updates the background elements to reflect the current
  1393. * slide.
  1394. */
  1395. function updateBackground() {
  1396. // Update the classes of all backgrounds to match the
  1397. // states of their slides (past/present/future)
  1398. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  1399. // Reverse past/future classes when in RTL mode
  1400. var horizontalPast = config.rtl ? 'future' : 'past',
  1401. horizontalFuture = config.rtl ? 'past' : 'future';
  1402. backgroundh.className = 'slide-background ' + ( h < indexh ? horizontalPast : h > indexh ? horizontalFuture : 'present' );
  1403. toArray( backgroundh.childNodes ).forEach( function( backgroundv, v ) {
  1404. backgroundv.className = 'slide-background ' + ( v < indexv ? 'past' : v > indexv ? 'future' : 'present' );
  1405. } );
  1406. } );
  1407. // Allow the first background to apply without transition
  1408. setTimeout( function() {
  1409. dom.background.classList.remove( 'no-transition' );
  1410. }, 1 );
  1411. }
  1412. /**
  1413. * Determine what available routes there are for navigation.
  1414. *
  1415. * @return {Object} containing four booleans: left/right/up/down
  1416. */
  1417. function availableRoutes() {
  1418. var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  1419. verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  1420. var routes = {
  1421. left: indexh > 0 || config.loop,
  1422. right: indexh < horizontalSlides.length - 1 || config.loop,
  1423. up: indexv > 0,
  1424. down: indexv < verticalSlides.length - 1
  1425. };
  1426. // reverse horizontal controls for rtl
  1427. if( config.rtl ) {
  1428. var left = routes.left;
  1429. routes.left = routes.right;
  1430. routes.right = left;
  1431. }
  1432. return routes;
  1433. }
  1434. /**
  1435. * Returns an object describing the available fragment
  1436. * directions.
  1437. *
  1438. * @return {Object} two boolean properties: prev/next
  1439. */
  1440. function availableFragments() {
  1441. if( currentSlide && config.fragments ) {
  1442. var fragments = currentSlide.querySelectorAll( '.fragment' );
  1443. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  1444. return {
  1445. prev: fragments.length - hiddenFragments.length > 0,
  1446. next: !!hiddenFragments.length
  1447. };
  1448. }
  1449. else {
  1450. return { prev: false, next: false };
  1451. }
  1452. }
  1453. /**
  1454. * Start playback of any embedded content inside of
  1455. * the targeted slide.
  1456. */
  1457. function startEmbeddedContent( slide ) {
  1458. if( slide ) {
  1459. // HTML5 media elements
  1460. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1461. if( el.hasAttribute( 'data-autoplay' ) ) {
  1462. el.play();
  1463. }
  1464. } );
  1465. // YouTube embeds
  1466. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1467. if( el.hasAttribute( 'data-autoplay' ) ) {
  1468. el.contentWindow.postMessage('{"event":"command","func":"playVideo","args":""}', '*');
  1469. }
  1470. });
  1471. }
  1472. }
  1473. /**
  1474. * Stop playback of any embedded content inside of
  1475. * the targeted slide.
  1476. */
  1477. function stopEmbeddedContent( slide ) {
  1478. if( slide ) {
  1479. // HTML5 media elements
  1480. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  1481. if( !el.hasAttribute( 'data-ignore' ) ) {
  1482. el.pause();
  1483. }
  1484. } );
  1485. // YouTube embeds
  1486. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  1487. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  1488. el.contentWindow.postMessage('{"event":"command","func":"pauseVideo","args":""}', '*');
  1489. }
  1490. });
  1491. }
  1492. }
  1493. /**
  1494. * Reads the current URL (hash) and navigates accordingly.
  1495. */
  1496. function readURL() {
  1497. var hash = window.location.hash;
  1498. // Attempt to parse the hash as either an index or name
  1499. var bits = hash.slice( 2 ).split( '/' ),
  1500. name = hash.replace( /#|\//gi, '' );
  1501. // If the first bit is invalid and there is a name we can
  1502. // assume that this is a named link
  1503. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  1504. // Find the slide with the specified name
  1505. var element = document.querySelector( '#' + name );
  1506. if( element ) {
  1507. // Find the position of the named slide and navigate to it
  1508. var indices = Reveal.getIndices( element );
  1509. slide( indices.h, indices.v );
  1510. }
  1511. // If the slide doesn't exist, navigate to the current slide
  1512. else {
  1513. slide( indexh || 0, indexv || 0 );
  1514. }
  1515. }
  1516. else {
  1517. // Read the index components of the hash
  1518. var h = parseInt( bits[0], 10 ) || 0,
  1519. v = parseInt( bits[1], 10 ) || 0;
  1520. if( h !== indexh || v !== indexv ) {
  1521. slide( h, v );
  1522. }
  1523. }
  1524. }
  1525. /**
  1526. * Updates the page URL (hash) to reflect the current
  1527. * state.
  1528. *
  1529. * @param {Number} delay The time in ms to wait before
  1530. * writing the hash
  1531. */
  1532. function writeURL( delay ) {
  1533. if( config.history ) {
  1534. // Make sure there's never more than one timeout running
  1535. clearTimeout( writeURLTimeout );
  1536. // If a delay is specified, timeout this call
  1537. if( typeof delay === 'number' ) {
  1538. writeURLTimeout = setTimeout( writeURL, delay );
  1539. }
  1540. else {
  1541. var url = '/';
  1542. // If the current slide has an ID, use that as a named link
  1543. if( currentSlide && typeof currentSlide.getAttribute( 'id' ) === 'string' ) {
  1544. url = '/' + currentSlide.getAttribute( 'id' );
  1545. }
  1546. // Otherwise use the /h/v index
  1547. else {
  1548. if( indexh > 0 || indexv > 0 ) url += indexh;
  1549. if( indexv > 0 ) url += '/' + indexv;
  1550. }
  1551. window.location.hash = url;
  1552. }
  1553. }
  1554. }
  1555. /**
  1556. * Retrieves the h/v location of the current, or specified,
  1557. * slide.
  1558. *
  1559. * @param {HTMLElement} slide If specified, the returned
  1560. * index will be for this slide rather than the currently
  1561. * active one
  1562. *
  1563. * @return {Object} { h: <int>, v: <int>, f: <int> }
  1564. */
  1565. function getIndices( slide ) {
  1566. // By default, return the current indices
  1567. var h = indexh,
  1568. v = indexv,
  1569. f;
  1570. // If a slide is specified, return the indices of that slide
  1571. if( slide ) {
  1572. var isVertical = isVerticalSlide( slide );
  1573. var slideh = isVertical ? slide.parentNode : slide;
  1574. // Select all horizontal slides
  1575. var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1576. // Now that we know which the horizontal slide is, get its index
  1577. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  1578. // If this is a vertical slide, grab the vertical index
  1579. if( isVertical ) {
  1580. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  1581. }
  1582. }
  1583. if( !slide && currentSlide ) {
  1584. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  1585. if( hasFragments ) {
  1586. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  1587. f = visibleFragments.length;
  1588. }
  1589. }
  1590. return { h: h, v: v, f: f };
  1591. }
  1592. /**
  1593. * Navigate to the next slide fragment.
  1594. *
  1595. * @return {Boolean} true if there was a next fragment,
  1596. * false otherwise
  1597. */
  1598. function nextFragment() {
  1599. if( currentSlide && config.fragments ) {
  1600. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment:not(.visible)' ) );
  1601. if( fragments.length ) {
  1602. // Find the index of the next fragment
  1603. var index = fragments[0].getAttribute( 'data-fragment-index' );
  1604. // Find all fragments with the same index
  1605. fragments = currentSlide.querySelectorAll( '.fragment[data-fragment-index="'+ index +'"]' );
  1606. toArray( fragments ).forEach( function( element ) {
  1607. element.classList.add( 'visible' );
  1608. } );
  1609. // Notify subscribers of the change
  1610. dispatchEvent( 'fragmentshown', { fragment: fragments[0], fragments: fragments } );
  1611. updateControls();
  1612. return true;
  1613. }
  1614. }
  1615. return false;
  1616. }
  1617. /**
  1618. * Navigate to the previous slide fragment.
  1619. *
  1620. * @return {Boolean} true if there was a previous fragment,
  1621. * false otherwise
  1622. */
  1623. function previousFragment() {
  1624. if( currentSlide && config.fragments ) {
  1625. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) );
  1626. if( fragments.length ) {
  1627. // Find the index of the previous fragment
  1628. var index = fragments[ fragments.length - 1 ].getAttribute( 'data-fragment-index' );
  1629. // Find all fragments with the same index
  1630. fragments = currentSlide.querySelectorAll( '.fragment[data-fragment-index="'+ index +'"]' );
  1631. toArray( fragments ).forEach( function( f ) {
  1632. f.classList.remove( 'visible' );
  1633. } );
  1634. // Notify subscribers of the change
  1635. dispatchEvent( 'fragmenthidden', { fragment: fragments[0], fragments: fragments } );
  1636. updateControls();
  1637. return true;
  1638. }
  1639. }
  1640. return false;
  1641. }
  1642. /**
  1643. * Cues a new automated slide if enabled in the config.
  1644. */
  1645. function cueAutoSlide() {
  1646. clearTimeout( autoSlideTimeout );
  1647. // Cue the next auto-slide if enabled
  1648. if( autoSlide && !isPaused() && !isOverview() ) {
  1649. autoSlideTimeout = setTimeout( navigateNext, autoSlide );
  1650. }
  1651. }
  1652. /**
  1653. * Cancels any ongoing request to auto-slide.
  1654. */
  1655. function cancelAutoSlide() {
  1656. clearTimeout( autoSlideTimeout );
  1657. }
  1658. function navigateLeft() {
  1659. // Reverse for RTL
  1660. if( config.rtl ) {
  1661. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  1662. slide( indexh + 1 );
  1663. }
  1664. }
  1665. // Normal navigation
  1666. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  1667. slide( indexh - 1 );
  1668. }
  1669. }
  1670. function navigateRight() {
  1671. // Reverse for RTL
  1672. if( config.rtl ) {
  1673. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  1674. slide( indexh - 1 );
  1675. }
  1676. }
  1677. // Normal navigation
  1678. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  1679. slide( indexh + 1 );
  1680. }
  1681. }
  1682. function navigateUp() {
  1683. // Prioritize hiding fragments
  1684. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  1685. slide( indexh, indexv - 1 );
  1686. }
  1687. }
  1688. function navigateDown() {
  1689. // Prioritize revealing fragments
  1690. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  1691. slide( indexh, indexv + 1 );
  1692. }
  1693. }
  1694. /**
  1695. * Navigates backwards, prioritized in the following order:
  1696. * 1) Previous fragment
  1697. * 2) Previous vertical slide
  1698. * 3) Previous horizontal slide
  1699. */
  1700. function navigatePrev() {
  1701. // Prioritize revealing fragments
  1702. if( previousFragment() === false ) {
  1703. if( availableRoutes().up ) {
  1704. navigateUp();
  1705. }
  1706. else {
  1707. // Fetch the previous horizontal slide, if there is one
  1708. var previousSlide = document.querySelector( HORIZONTAL_SLIDES_SELECTOR + '.past:nth-child(' + indexh + ')' );
  1709. if( previousSlide ) {
  1710. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  1711. var h = indexh - 1;
  1712. slide( h, v );
  1713. }
  1714. }
  1715. }
  1716. }
  1717. /**
  1718. * Same as #navigatePrev() but navigates forwards.
  1719. */
  1720. function navigateNext() {
  1721. // Prioritize revealing fragments
  1722. if( nextFragment() === false ) {
  1723. availableRoutes().down ? navigateDown() : navigateRight();
  1724. }
  1725. // If auto-sliding is enabled we need to cue up
  1726. // another timeout
  1727. cueAutoSlide();
  1728. }
  1729. // --------------------------------------------------------------------//
  1730. // ----------------------------- EVENTS -------------------------------//
  1731. // --------------------------------------------------------------------//
  1732. /**
  1733. * Handler for the document level 'keydown' event.
  1734. *
  1735. * @param {Object} event
  1736. */
  1737. function onDocumentKeyDown( event ) {
  1738. // Check if there's a focused element that could be using
  1739. // the keyboard
  1740. var activeElement = document.activeElement;
  1741. var hasFocus = !!( document.activeElement && ( document.activeElement.type || document.activeElement.href || document.activeElement.contentEditable !== 'inherit' ) );
  1742. // Disregard the event if there's a focused element or a
  1743. // keyboard modifier key is present
  1744. if( hasFocus || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  1745. // While paused only allow "unpausing" keyboard events (b and .)
  1746. if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) {
  1747. return false;
  1748. }
  1749. var triggered = false;
  1750. // 1. User defined key bindings
  1751. if( typeof config.keyboard === 'object' ) {
  1752. for( var key in config.keyboard ) {
  1753. // Check if this binding matches the pressed key
  1754. if( parseInt( key, 10 ) === event.keyCode ) {
  1755. var value = config.keyboard[ key ];
  1756. // Callback function
  1757. if( typeof value === 'function' ) {
  1758. value.apply( null, [ event ] );
  1759. }
  1760. // String shortcuts to reveal.js API
  1761. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  1762. Reveal[ value ].call();
  1763. }
  1764. triggered = true;
  1765. }
  1766. }
  1767. }
  1768. // 2. System defined key bindings
  1769. if( triggered === false ) {
  1770. // Assume true and try to prove false
  1771. triggered = true;
  1772. switch( event.keyCode ) {
  1773. // p, page up
  1774. case 80: case 33: navigatePrev(); break;
  1775. // n, page down
  1776. case 78: case 34: navigateNext(); break;
  1777. // h, left
  1778. case 72: case 37: navigateLeft(); break;
  1779. // l, right
  1780. case 76: case 39: navigateRight(); break;
  1781. // k, up
  1782. case 75: case 38: navigateUp(); break;
  1783. // j, down
  1784. case 74: case 40: navigateDown(); break;
  1785. // home
  1786. case 36: slide( 0 ); break;
  1787. // end
  1788. case 35: slide( Number.MAX_VALUE ); break;
  1789. // space
  1790. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  1791. // return
  1792. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  1793. // b, period, Logitech presenter tools "black screen" button
  1794. case 66: case 190: case 191: togglePause(); break;
  1795. // f
  1796. case 70: enterFullscreen(); break;
  1797. default:
  1798. triggered = false;
  1799. }
  1800. }
  1801. // If the input resulted in a triggered action we should prevent
  1802. // the browsers default behavior
  1803. if( triggered ) {
  1804. event.preventDefault();
  1805. }
  1806. // ESC or O key
  1807. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && supports3DTransforms ) {
  1808. toggleOverview();
  1809. event.preventDefault();
  1810. }
  1811. // If auto-sliding is enabled we need to cue up
  1812. // another timeout
  1813. cueAutoSlide();
  1814. }
  1815. /**
  1816. * Handler for the 'touchstart' event, enables support for
  1817. * swipe and pinch gestures.
  1818. */
  1819. function onTouchStart( event ) {
  1820. touch.startX = event.touches[0].clientX;
  1821. touch.startY = event.touches[0].clientY;
  1822. touch.startCount = event.touches.length;
  1823. // If there's two touches we need to memorize the distance
  1824. // between those two points to detect pinching
  1825. if( event.touches.length === 2 && config.overview ) {
  1826. touch.startSpan = distanceBetween( {
  1827. x: event.touches[1].clientX,
  1828. y: event.touches[1].clientY
  1829. }, {
  1830. x: touch.startX,
  1831. y: touch.startY
  1832. } );
  1833. }
  1834. }
  1835. /**
  1836. * Handler for the 'touchmove' event.
  1837. */
  1838. function onTouchMove( event ) {
  1839. // Each touch should only trigger one action
  1840. if( !touch.captured ) {
  1841. var currentX = event.touches[0].clientX;
  1842. var currentY = event.touches[0].clientY;
  1843. // If the touch started with two points and still has
  1844. // two active touches; test for the pinch gesture
  1845. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  1846. // The current distance in pixels between the two touch points
  1847. var currentSpan = distanceBetween( {
  1848. x: event.touches[1].clientX,
  1849. y: event.touches[1].clientY
  1850. }, {
  1851. x: touch.startX,
  1852. y: touch.startY
  1853. } );
  1854. // If the span is larger than the desire amount we've got
  1855. // ourselves a pinch
  1856. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  1857. touch.captured = true;
  1858. if( currentSpan < touch.startSpan ) {
  1859. activateOverview();
  1860. }
  1861. else {
  1862. deactivateOverview();
  1863. }
  1864. }
  1865. event.preventDefault();
  1866. }
  1867. // There was only one touch point, look for a swipe
  1868. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  1869. var deltaX = currentX - touch.startX,
  1870. deltaY = currentY - touch.startY;
  1871. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  1872. touch.captured = true;
  1873. navigateLeft();
  1874. }
  1875. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  1876. touch.captured = true;
  1877. navigateRight();
  1878. }
  1879. else if( deltaY > touch.threshold ) {
  1880. touch.captured = true;
  1881. navigateUp();
  1882. }
  1883. else if( deltaY < -touch.threshold ) {
  1884. touch.captured = true;
  1885. navigateDown();
  1886. }
  1887. // If we're embedded, only block touch events if they have
  1888. // triggered an action
  1889. if( config.embedded ) {
  1890. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  1891. event.preventDefault();
  1892. }
  1893. }
  1894. // Not embedded? Block them all to avoid needless tossing
  1895. // around of the viewport in iOS
  1896. else {
  1897. event.preventDefault();
  1898. }
  1899. }
  1900. }
  1901. // There's a bug with swiping on some Android devices unless
  1902. // the default action is always prevented
  1903. else if( navigator.userAgent.match( /android/gi ) ) {
  1904. event.preventDefault();
  1905. }
  1906. }
  1907. /**
  1908. * Handler for the 'touchend' event.
  1909. */
  1910. function onTouchEnd( event ) {
  1911. touch.captured = false;
  1912. }
  1913. /**
  1914. * Convert pointer down to touch start.
  1915. */
  1916. function onPointerDown( event ) {
  1917. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH ) {
  1918. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  1919. onTouchStart( event );
  1920. }
  1921. }
  1922. /**
  1923. * Convert pointer move to touch move.
  1924. */
  1925. function onPointerMove( event ) {
  1926. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH ) {
  1927. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  1928. onTouchMove( event );
  1929. }
  1930. }
  1931. /**
  1932. * Convert pointer up to touch end.
  1933. */
  1934. function onPointerUp( event ) {
  1935. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH ) {
  1936. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  1937. onTouchEnd( event );
  1938. }
  1939. }
  1940. /**
  1941. * Handles mouse wheel scrolling, throttled to avoid skipping
  1942. * multiple slides.
  1943. */
  1944. function onDocumentMouseScroll( event ) {
  1945. if( Date.now() - lastMouseWheelStep > 600 ) {
  1946. lastMouseWheelStep = Date.now();
  1947. var delta = event.detail || -event.wheelDelta;
  1948. if( delta > 0 ) {
  1949. navigateNext();
  1950. }
  1951. else {
  1952. navigatePrev();
  1953. }
  1954. }
  1955. }
  1956. /**
  1957. * Clicking on the progress bar results in a navigation to the
  1958. * closest approximate horizontal slide using this equation:
  1959. *
  1960. * ( clickX / presentationWidth ) * numberOfSlides
  1961. */
  1962. function onProgressClicked( event ) {
  1963. event.preventDefault();
  1964. var slidesTotal = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  1965. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  1966. slide( slideIndex );
  1967. }
  1968. /**
  1969. * Event handler for navigation control buttons.
  1970. */
  1971. function onNavigateLeftClicked( event ) { event.preventDefault(); navigateLeft(); }
  1972. function onNavigateRightClicked( event ) { event.preventDefault(); navigateRight(); }
  1973. function onNavigateUpClicked( event ) { event.preventDefault(); navigateUp(); }
  1974. function onNavigateDownClicked( event ) { event.preventDefault(); navigateDown(); }
  1975. function onNavigatePrevClicked( event ) { event.preventDefault(); navigatePrev(); }
  1976. function onNavigateNextClicked( event ) { event.preventDefault(); navigateNext(); }
  1977. /**
  1978. * Handler for the window level 'hashchange' event.
  1979. */
  1980. function onWindowHashChange( event ) {
  1981. readURL();
  1982. }
  1983. /**
  1984. * Handler for the window level 'resize' event.
  1985. */
  1986. function onWindowResize( event ) {
  1987. layout();
  1988. }
  1989. /**
  1990. * Invoked when a slide is and we're in the overview.
  1991. */
  1992. function onOverviewSlideClicked( event ) {
  1993. // TODO There's a bug here where the event listeners are not
  1994. // removed after deactivating the overview.
  1995. if( eventsAreBound && isOverview() ) {
  1996. event.preventDefault();
  1997. var element = event.target;
  1998. while( element && !element.nodeName.match( /section/gi ) ) {
  1999. element = element.parentNode;
  2000. }
  2001. if( element && !element.classList.contains( 'disabled' ) ) {
  2002. deactivateOverview();
  2003. if( element.nodeName.match( /section/gi ) ) {
  2004. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  2005. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  2006. slide( h, v );
  2007. }
  2008. }
  2009. }
  2010. }
  2011. /**
  2012. * Handles clicks on links that are set to preview in the
  2013. * iframe overlay.
  2014. */
  2015. function onPreviewLinkClicked( event ) {
  2016. var url = event.target.getAttribute( 'href' );
  2017. if( url ) {
  2018. openPreview( url );
  2019. event.preventDefault();
  2020. }
  2021. }
  2022. // --------------------------------------------------------------------//
  2023. // ------------------------------- API --------------------------------//
  2024. // --------------------------------------------------------------------//
  2025. return {
  2026. initialize: initialize,
  2027. configure: configure,
  2028. sync: sync,
  2029. // Navigation methods
  2030. slide: slide,
  2031. left: navigateLeft,
  2032. right: navigateRight,
  2033. up: navigateUp,
  2034. down: navigateDown,
  2035. prev: navigatePrev,
  2036. next: navigateNext,
  2037. prevFragment: previousFragment,
  2038. nextFragment: nextFragment,
  2039. // Deprecated aliases
  2040. navigateTo: slide,
  2041. navigateLeft: navigateLeft,
  2042. navigateRight: navigateRight,
  2043. navigateUp: navigateUp,
  2044. navigateDown: navigateDown,
  2045. navigatePrev: navigatePrev,
  2046. navigateNext: navigateNext,
  2047. // Forces an update in slide layout
  2048. layout: layout,
  2049. // Returns an object with the available routes as booleans (left/right/top/bottom)
  2050. availableRoutes: availableRoutes,
  2051. // Returns an object with the available fragments as booleans (prev/next)
  2052. availableFragments: availableFragments,
  2053. // Toggles the overview mode on/off
  2054. toggleOverview: toggleOverview,
  2055. // Toggles the "black screen" mode on/off
  2056. togglePause: togglePause,
  2057. // State checks
  2058. isOverview: isOverview,
  2059. isPaused: isPaused,
  2060. // Adds or removes all internal event listeners (such as keyboard)
  2061. addEventListeners: addEventListeners,
  2062. removeEventListeners: removeEventListeners,
  2063. // Returns the indices of the current, or specified, slide
  2064. getIndices: getIndices,
  2065. // Returns the slide at the specified index, y is optional
  2066. getSlide: function( x, y ) {
  2067. var horizontalSlide = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2068. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2069. if( typeof y !== 'undefined' ) {
  2070. return verticalSlides ? verticalSlides[ y ] : undefined;
  2071. }
  2072. return horizontalSlide;
  2073. },
  2074. // Returns the previous slide element, may be null
  2075. getPreviousSlide: function() {
  2076. return previousSlide;
  2077. },
  2078. // Returns the current slide element
  2079. getCurrentSlide: function() {
  2080. return currentSlide;
  2081. },
  2082. // Returns the current scale of the presentation content
  2083. getScale: function() {
  2084. return scale;
  2085. },
  2086. // Returns the current configuration object
  2087. getConfig: function() {
  2088. return config;
  2089. },
  2090. // Helper method, retrieves query string as a key/value hash
  2091. getQueryHash: function() {
  2092. var query = {};
  2093. location.search.replace( /[A-Z0-9]+?=(\w*)/gi, function(a) {
  2094. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  2095. } );
  2096. return query;
  2097. },
  2098. // Returns true if we're currently on the first slide
  2099. isFirstSlide: function() {
  2100. return document.querySelector( SLIDES_SELECTOR + '.past' ) == null ? true : false;
  2101. },
  2102. // Returns true if we're currently on the last slide
  2103. isLastSlide: function() {
  2104. if( currentSlide ) {
  2105. // Does this slide has next a sibling?
  2106. if( currentSlide.nextElementSibling ) return false;
  2107. // If it's vertical, does its parent have a next sibling?
  2108. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  2109. return true;
  2110. }
  2111. return false;
  2112. },
  2113. // Checks if reveal.js has been loaded and is ready for use
  2114. isReady: function() {
  2115. return loaded;
  2116. },
  2117. // Forward event binding to the reveal DOM element
  2118. addEventListener: function( type, listener, useCapture ) {
  2119. if( 'addEventListener' in window ) {
  2120. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  2121. }
  2122. },
  2123. removeEventListener: function( type, listener, useCapture ) {
  2124. if( 'addEventListener' in window ) {
  2125. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  2126. }
  2127. }
  2128. };
  2129. })();