reveal.js 169 KB

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  1. /*!
  2. * reveal.js
  3. * http://revealjs.com
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2020 Hakim El Hattab, http://hakim.se
  7. */
  8. (function( root, factory ) {
  9. if( typeof define === 'function' && define.amd ) {
  10. // AMD. Register as an anonymous module.
  11. define( function() {
  12. root.Reveal = factory();
  13. return root.Reveal;
  14. } );
  15. } else if( typeof exports === 'object' ) {
  16. // Node. Does not work with strict CommonJS.
  17. module.exports = factory();
  18. } else {
  19. // Browser globals.
  20. root.Reveal = factory();
  21. }
  22. }( this, function() {
  23. 'use strict';
  24. var Reveal;
  25. // The reveal.js version
  26. var VERSION = '3.9.1';
  27. var SLIDES_SELECTOR = '.slides section',
  28. HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
  29. VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
  30. HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
  31. UA = navigator.userAgent,
  32. // Configuration defaults, can be overridden at initialization time
  33. config = {
  34. // The "normal" size of the presentation, aspect ratio will be preserved
  35. // when the presentation is scaled to fit different resolutions
  36. width: 960,
  37. height: 700,
  38. // Factor of the display size that should remain empty around the content
  39. margin: 0.04,
  40. // Bounds for smallest/largest possible scale to apply to content
  41. minScale: 0.2,
  42. maxScale: 2.0,
  43. // Display presentation control arrows
  44. controls: true,
  45. // Help the user learn the controls by providing hints, for example by
  46. // bouncing the down arrow when they first encounter a vertical slide
  47. controlsTutorial: true,
  48. // Determines where controls appear, "edges" or "bottom-right"
  49. controlsLayout: 'bottom-right',
  50. // Visibility rule for backwards navigation arrows; "faded", "hidden"
  51. // or "visible"
  52. controlsBackArrows: 'faded',
  53. // Display a presentation progress bar
  54. progress: true,
  55. // Display the page number of the current slide
  56. // - true: Show slide number
  57. // - false: Hide slide number
  58. //
  59. // Can optionally be set as a string that specifies the number formatting:
  60. // - "h.v": Horizontal . vertical slide number (default)
  61. // - "h/v": Horizontal / vertical slide number
  62. // - "c": Flattened slide number
  63. // - "c/t": Flattened slide number / total slides
  64. //
  65. // Alternatively, you can provide a function that returns the slide
  66. // number for the current slide. The function should take in a slide
  67. // object and return an array with one string [slideNumber] or
  68. // three strings [n1,delimiter,n2]. See #formatSlideNumber().
  69. slideNumber: false,
  70. // Can be used to limit the contexts in which the slide number appears
  71. // - "all": Always show the slide number
  72. // - "print": Only when printing to PDF
  73. // - "speaker": Only in the speaker view
  74. showSlideNumber: 'all',
  75. // Use 1 based indexing for # links to match slide number (default is zero
  76. // based)
  77. hashOneBasedIndex: false,
  78. // Add the current slide number to the URL hash so that reloading the
  79. // page/copying the URL will return you to the same slide
  80. hash: false,
  81. // Push each slide change to the browser history. Implies `hash: true`
  82. history: false,
  83. // Enable keyboard shortcuts for navigation
  84. keyboard: true,
  85. // Optional function that blocks keyboard events when retuning false
  86. keyboardCondition: null,
  87. // Enable the slide overview mode
  88. overview: true,
  89. // Disables the default reveal.js slide layout so that you can use
  90. // custom CSS layout
  91. disableLayout: false,
  92. // Vertical centering of slides
  93. center: true,
  94. // Enables touch navigation on devices with touch input
  95. touch: true,
  96. // Loop the presentation
  97. loop: false,
  98. // Change the presentation direction to be RTL
  99. rtl: false,
  100. // Changes the behavior of our navigation directions.
  101. //
  102. // "default"
  103. // Left/right arrow keys step between horizontal slides, up/down
  104. // arrow keys step between vertical slides. Space key steps through
  105. // all slides (both horizontal and vertical).
  106. //
  107. // "linear"
  108. // Removes the up/down arrows. Left/right arrows step through all
  109. // slides (both horizontal and vertical).
  110. //
  111. // "grid"
  112. // When this is enabled, stepping left/right from a vertical stack
  113. // to an adjacent vertical stack will land you at the same vertical
  114. // index.
  115. //
  116. // Consider a deck with six slides ordered in two vertical stacks:
  117. // 1.1 2.1
  118. // 1.2 2.2
  119. // 1.3 2.3
  120. //
  121. // If you're on slide 1.3 and navigate right, you will normally move
  122. // from 1.3 -> 2.1. If "grid" is used, the same navigation takes you
  123. // from 1.3 -> 2.3.
  124. navigationMode: 'default',
  125. // Randomizes the order of slides each time the presentation loads
  126. shuffle: false,
  127. // Turns fragments on and off globally
  128. fragments: true,
  129. // Flags whether to include the current fragment in the URL,
  130. // so that reloading brings you to the same fragment position
  131. fragmentInURL: false,
  132. // Flags if the presentation is running in an embedded mode,
  133. // i.e. contained within a limited portion of the screen
  134. embedded: false,
  135. // Flags if we should show a help overlay when the question-mark
  136. // key is pressed
  137. help: true,
  138. // Flags if it should be possible to pause the presentation (blackout)
  139. pause: true,
  140. // Flags if speaker notes should be visible to all viewers
  141. showNotes: false,
  142. // Global override for autolaying embedded media (video/audio/iframe)
  143. // - null: Media will only autoplay if data-autoplay is present
  144. // - true: All media will autoplay, regardless of individual setting
  145. // - false: No media will autoplay, regardless of individual setting
  146. autoPlayMedia: null,
  147. // Global override for preloading lazy-loaded iframes
  148. // - null: Iframes with data-src AND data-preload will be loaded when within
  149. // the viewDistance, iframes with only data-src will be loaded when visible
  150. // - true: All iframes with data-src will be loaded when within the viewDistance
  151. // - false: All iframes with data-src will be loaded only when visible
  152. preloadIframes: null,
  153. // Controls automatic progression to the next slide
  154. // - 0: Auto-sliding only happens if the data-autoslide HTML attribute
  155. // is present on the current slide or fragment
  156. // - 1+: All slides will progress automatically at the given interval
  157. // - false: No auto-sliding, even if data-autoslide is present
  158. autoSlide: 0,
  159. // Stop auto-sliding after user input
  160. autoSlideStoppable: true,
  161. // Use this method for navigation when auto-sliding (defaults to navigateNext)
  162. autoSlideMethod: null,
  163. // Specify the average time in seconds that you think you will spend
  164. // presenting each slide. This is used to show a pacing timer in the
  165. // speaker view
  166. defaultTiming: null,
  167. // Enable slide navigation via mouse wheel
  168. mouseWheel: false,
  169. // Apply a 3D roll to links on hover
  170. rollingLinks: false,
  171. // Hides the address bar on mobile devices
  172. hideAddressBar: true,
  173. // Opens links in an iframe preview overlay
  174. // Add `data-preview-link` and `data-preview-link="false"` to customise each link
  175. // individually
  176. previewLinks: false,
  177. // Exposes the reveal.js API through window.postMessage
  178. postMessage: true,
  179. // Dispatches all reveal.js events to the parent window through postMessage
  180. postMessageEvents: false,
  181. // Focuses body when page changes visibility to ensure keyboard shortcuts work
  182. focusBodyOnPageVisibilityChange: true,
  183. // Transition style
  184. transition: 'slide', // none/fade/slide/convex/concave/zoom
  185. // Transition speed
  186. transitionSpeed: 'default', // default/fast/slow
  187. // Transition style for full page slide backgrounds
  188. backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
  189. // Parallax background image
  190. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  191. // Parallax background size
  192. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  193. // Parallax background repeat
  194. parallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit
  195. // Parallax background position
  196. parallaxBackgroundPosition: '', // CSS syntax, e.g. "top left"
  197. // Amount of pixels to move the parallax background per slide step
  198. parallaxBackgroundHorizontal: null,
  199. parallaxBackgroundVertical: null,
  200. // The maximum number of pages a single slide can expand onto when printing
  201. // to PDF, unlimited by default
  202. pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,
  203. // Prints each fragment on a separate slide
  204. pdfSeparateFragments: true,
  205. // Offset used to reduce the height of content within exported PDF pages.
  206. // This exists to account for environment differences based on how you
  207. // print to PDF. CLI printing options, like phantomjs and wkpdf, can end
  208. // on precisely the total height of the document whereas in-browser
  209. // printing has to end one pixel before.
  210. pdfPageHeightOffset: -1,
  211. // Number of slides away from the current that are visible
  212. viewDistance: 3,
  213. // Number of slides away from the current that are visible on mobile
  214. // devices. It is advisable to set this to a lower number than
  215. // viewDistance in order to save resources.
  216. mobileViewDistance: 2,
  217. // The display mode that will be used to show slides
  218. display: 'block',
  219. // Hide cursor if inactive
  220. hideInactiveCursor: true,
  221. // Time before the cursor is hidden (in ms)
  222. hideCursorTime: 5000,
  223. // Script dependencies to load
  224. dependencies: []
  225. },
  226. // Flags if Reveal.initialize() has been called
  227. initialized = false,
  228. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  229. loaded = false,
  230. // Flags if the overview mode is currently active
  231. overview = false,
  232. // Holds the dimensions of our overview slides, including margins
  233. overviewSlideWidth = null,
  234. overviewSlideHeight = null,
  235. // The horizontal and vertical index of the currently active slide
  236. indexh,
  237. indexv,
  238. // The previous and current slide HTML elements
  239. previousSlide,
  240. currentSlide,
  241. previousBackground,
  242. // Remember which directions that the user has navigated towards
  243. hasNavigatedRight = false,
  244. hasNavigatedDown = false,
  245. // Slides may hold a data-state attribute which we pick up and apply
  246. // as a class to the body. This list contains the combined state of
  247. // all current slides.
  248. state = [],
  249. // The current scale of the presentation (see width/height config)
  250. scale = 1,
  251. // CSS transform that is currently applied to the slides container,
  252. // split into two groups
  253. slidesTransform = { layout: '', overview: '' },
  254. // Cached references to DOM elements
  255. dom = {},
  256. // A list of registered reveal.js plugins
  257. plugins = {},
  258. // List of asynchronously loaded reveal.js dependencies
  259. asyncDependencies = [],
  260. // Features supported by the browser, see #checkCapabilities()
  261. features = {},
  262. // Client is a mobile device, see #checkCapabilities()
  263. isMobileDevice,
  264. // Client is a desktop Chrome, see #checkCapabilities()
  265. isChrome,
  266. // Throttles mouse wheel navigation
  267. lastMouseWheelStep = 0,
  268. // Delays updates to the URL due to a Chrome thumbnailer bug
  269. writeURLTimeout = 0,
  270. // Is the mouse pointer currently hidden from view
  271. cursorHidden = false,
  272. // Timeout used to determine when the cursor is inactive
  273. cursorInactiveTimeout = 0,
  274. // Flags if the interaction event listeners are bound
  275. eventsAreBound = false,
  276. // The current auto-slide duration
  277. autoSlide = 0,
  278. // Auto slide properties
  279. autoSlidePlayer,
  280. autoSlideTimeout = 0,
  281. autoSlideStartTime = -1,
  282. autoSlidePaused = false,
  283. // Holds information about the currently ongoing touch input
  284. touch = {
  285. startX: 0,
  286. startY: 0,
  287. startCount: 0,
  288. captured: false,
  289. threshold: 40
  290. },
  291. // A key:value map of shortcut keyboard keys and descriptions of
  292. // the actions they trigger, generated in #configure()
  293. keyboardShortcuts = {},
  294. // Holds custom key code mappings
  295. registeredKeyBindings = {};
  296. /**
  297. * Starts up the presentation if the client is capable.
  298. */
  299. function initialize( options ) {
  300. // Make sure we only initialize once
  301. if( initialized === true ) return;
  302. initialized = true;
  303. checkCapabilities();
  304. if( !features.transforms2d && !features.transforms3d ) {
  305. document.body.setAttribute( 'class', 'no-transforms' );
  306. // Since JS won't be running any further, we load all lazy
  307. // loading elements upfront
  308. var images = toArray( document.getElementsByTagName( 'img' ) ),
  309. iframes = toArray( document.getElementsByTagName( 'iframe' ) );
  310. var lazyLoadable = images.concat( iframes );
  311. for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
  312. var element = lazyLoadable[i];
  313. if( element.getAttribute( 'data-src' ) ) {
  314. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  315. element.removeAttribute( 'data-src' );
  316. }
  317. }
  318. // If the browser doesn't support core features we won't be
  319. // using JavaScript to control the presentation
  320. return;
  321. }
  322. // Cache references to key DOM elements
  323. dom.wrapper = document.querySelector( '.reveal' );
  324. dom.slides = document.querySelector( '.reveal .slides' );
  325. // Force a layout when the whole page, incl fonts, has loaded
  326. window.addEventListener( 'load', layout, false );
  327. var query = Reveal.getQueryHash();
  328. // Do not accept new dependencies via query config to avoid
  329. // the potential of malicious script injection
  330. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  331. // Copy options over to our config object
  332. extend( config, options );
  333. extend( config, query );
  334. // Hide the address bar in mobile browsers
  335. hideAddressBar();
  336. // Loads dependencies and continues to #start() once done
  337. load();
  338. }
  339. /**
  340. * Inspect the client to see what it's capable of, this
  341. * should only happens once per runtime.
  342. */
  343. function checkCapabilities() {
  344. isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA ) ||
  345. ( navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1 ); // iPadOS
  346. isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
  347. var testElement = document.createElement( 'div' );
  348. features.transforms3d = 'WebkitPerspective' in testElement.style ||
  349. 'MozPerspective' in testElement.style ||
  350. 'msPerspective' in testElement.style ||
  351. 'OPerspective' in testElement.style ||
  352. 'perspective' in testElement.style;
  353. features.transforms2d = 'WebkitTransform' in testElement.style ||
  354. 'MozTransform' in testElement.style ||
  355. 'msTransform' in testElement.style ||
  356. 'OTransform' in testElement.style ||
  357. 'transform' in testElement.style;
  358. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  359. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  360. features.canvas = !!document.createElement( 'canvas' ).getContext;
  361. // Transitions in the overview are disabled in desktop and
  362. // Safari due to lag
  363. features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );
  364. // Flags if we should use zoom instead of transform to scale
  365. // up slides. Zoom produces crisper results but has a lot of
  366. // xbrowser quirks so we only use it in whitelsited browsers.
  367. features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
  368. ( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
  369. }
  370. /**
  371. * Loads the dependencies of reveal.js. Dependencies are
  372. * defined via the configuration option 'dependencies'
  373. * and will be loaded prior to starting/binding reveal.js.
  374. * Some dependencies may have an 'async' flag, if so they
  375. * will load after reveal.js has been started up.
  376. */
  377. function load() {
  378. var scripts = [],
  379. scriptsToLoad = 0;
  380. config.dependencies.forEach( function( s ) {
  381. // Load if there's no condition or the condition is truthy
  382. if( !s.condition || s.condition() ) {
  383. if( s.async ) {
  384. asyncDependencies.push( s );
  385. }
  386. else {
  387. scripts.push( s );
  388. }
  389. }
  390. } );
  391. if( scripts.length ) {
  392. scriptsToLoad = scripts.length;
  393. // Load synchronous scripts
  394. scripts.forEach( function( s ) {
  395. loadScript( s.src, function() {
  396. if( typeof s.callback === 'function' ) s.callback();
  397. if( --scriptsToLoad === 0 ) {
  398. initPlugins();
  399. }
  400. } );
  401. } );
  402. }
  403. else {
  404. initPlugins();
  405. }
  406. }
  407. /**
  408. * Initializes our plugins and waits for them to be ready
  409. * before proceeding.
  410. */
  411. function initPlugins() {
  412. var pluginsToInitialize = Object.keys( plugins ).length;
  413. // If there are no plugins, skip this step
  414. if( pluginsToInitialize === 0 ) {
  415. loadAsyncDependencies();
  416. }
  417. // ... otherwise initialize plugins
  418. else {
  419. var afterPlugInitialized = function() {
  420. if( --pluginsToInitialize === 0 ) {
  421. loadAsyncDependencies();
  422. }
  423. };
  424. for( var i in plugins ) {
  425. var plugin = plugins[i];
  426. // If the plugin has an 'init' method, invoke it
  427. if( typeof plugin.init === 'function' ) {
  428. var callback = plugin.init();
  429. // If the plugin returned a Promise, wait for it
  430. if( callback && typeof callback.then === 'function' ) {
  431. callback.then( afterPlugInitialized );
  432. }
  433. else {
  434. afterPlugInitialized();
  435. }
  436. }
  437. else {
  438. afterPlugInitialized();
  439. }
  440. }
  441. }
  442. }
  443. /**
  444. * Loads all async reveal.js dependencies.
  445. */
  446. function loadAsyncDependencies() {
  447. if( asyncDependencies.length ) {
  448. asyncDependencies.forEach( function( s ) {
  449. loadScript( s.src, s.callback );
  450. } );
  451. }
  452. start();
  453. }
  454. /**
  455. * Loads a JavaScript file from the given URL and executes it.
  456. *
  457. * @param {string} url Address of the .js file to load
  458. * @param {function} callback Method to invoke when the script
  459. * has loaded and executed
  460. */
  461. function loadScript( url, callback ) {
  462. var script = document.createElement( 'script' );
  463. script.type = 'text/javascript';
  464. script.async = false;
  465. script.defer = false;
  466. script.src = url;
  467. if( callback ) {
  468. // Success callback
  469. script.onload = script.onreadystatechange = function( event ) {
  470. if( event.type === "load" || (/loaded|complete/.test( script.readyState ) ) ) {
  471. // Kill event listeners
  472. script.onload = script.onreadystatechange = script.onerror = null;
  473. callback();
  474. }
  475. };
  476. // Error callback
  477. script.onerror = function( err ) {
  478. // Kill event listeners
  479. script.onload = script.onreadystatechange = script.onerror = null;
  480. callback( new Error( 'Failed loading script: ' + script.src + '\n' + err) );
  481. };
  482. }
  483. // Append the script at the end of <head>
  484. var head = document.querySelector( 'head' );
  485. head.insertBefore( script, head.lastChild );
  486. }
  487. /**
  488. * Starts up reveal.js by binding input events and navigating
  489. * to the current URL deeplink if there is one.
  490. */
  491. function start() {
  492. loaded = true;
  493. // Make sure we've got all the DOM elements we need
  494. setupDOM();
  495. // Listen to messages posted to this window
  496. setupPostMessage();
  497. // Prevent the slides from being scrolled out of view
  498. setupScrollPrevention();
  499. // Resets all vertical slides so that only the first is visible
  500. resetVerticalSlides();
  501. // Updates the presentation to match the current configuration values
  502. configure();
  503. // Read the initial hash
  504. readURL();
  505. // Update all backgrounds
  506. updateBackground( true );
  507. // Notify listeners that the presentation is ready but use a 1ms
  508. // timeout to ensure it's not fired synchronously after #initialize()
  509. setTimeout( function() {
  510. // Enable transitions now that we're loaded
  511. dom.slides.classList.remove( 'no-transition' );
  512. dom.wrapper.classList.add( 'ready' );
  513. dispatchEvent( 'ready', {
  514. 'indexh': indexh,
  515. 'indexv': indexv,
  516. 'currentSlide': currentSlide
  517. } );
  518. }, 1 );
  519. // Special setup and config is required when printing to PDF
  520. if( isPrintingPDF() ) {
  521. removeEventListeners();
  522. // The document needs to have loaded for the PDF layout
  523. // measurements to be accurate
  524. if( document.readyState === 'complete' ) {
  525. setupPDF();
  526. }
  527. else {
  528. window.addEventListener( 'load', setupPDF );
  529. }
  530. }
  531. }
  532. /**
  533. * Finds and stores references to DOM elements which are
  534. * required by the presentation. If a required element is
  535. * not found, it is created.
  536. */
  537. function setupDOM() {
  538. // Prevent transitions while we're loading
  539. dom.slides.classList.add( 'no-transition' );
  540. if( isMobileDevice ) {
  541. dom.wrapper.classList.add( 'no-hover' );
  542. }
  543. else {
  544. dom.wrapper.classList.remove( 'no-hover' );
  545. }
  546. if( /iphone/gi.test( UA ) ) {
  547. dom.wrapper.classList.add( 'ua-iphone' );
  548. }
  549. else {
  550. dom.wrapper.classList.remove( 'ua-iphone' );
  551. }
  552. // Background element
  553. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  554. // Progress bar
  555. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  556. dom.progressbar = dom.progress.querySelector( 'span' );
  557. // Arrow controls
  558. dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls',
  559. '<button class="navigate-left" aria-label="previous slide"><div class="controls-arrow"></div></button>' +
  560. '<button class="navigate-right" aria-label="next slide"><div class="controls-arrow"></div></button>' +
  561. '<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>' +
  562. '<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></button>' );
  563. // Slide number
  564. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  565. // Element containing notes that are visible to the audience
  566. dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
  567. dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
  568. dom.speakerNotes.setAttribute( 'tabindex', '0' );
  569. // Overlay graphic which is displayed during the paused mode
  570. dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class="resume-button">Resume presentation</button>' : null );
  571. dom.wrapper.setAttribute( 'role', 'application' );
  572. // There can be multiple instances of controls throughout the page
  573. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  574. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  575. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  576. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  577. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  578. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  579. // The right and down arrows in the standard reveal.js controls
  580. dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' );
  581. dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' );
  582. dom.statusDiv = createStatusDiv();
  583. }
  584. /**
  585. * Creates a hidden div with role aria-live to announce the
  586. * current slide content. Hide the div off-screen to make it
  587. * available only to Assistive Technologies.
  588. *
  589. * @return {HTMLElement}
  590. */
  591. function createStatusDiv() {
  592. var statusDiv = document.getElementById( 'aria-status-div' );
  593. if( !statusDiv ) {
  594. statusDiv = document.createElement( 'div' );
  595. statusDiv.style.position = 'absolute';
  596. statusDiv.style.height = '1px';
  597. statusDiv.style.width = '1px';
  598. statusDiv.style.overflow = 'hidden';
  599. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  600. statusDiv.setAttribute( 'id', 'aria-status-div' );
  601. statusDiv.setAttribute( 'aria-live', 'polite' );
  602. statusDiv.setAttribute( 'aria-atomic','true' );
  603. dom.wrapper.appendChild( statusDiv );
  604. }
  605. return statusDiv;
  606. }
  607. /**
  608. * Converts the given HTML element into a string of text
  609. * that can be announced to a screen reader. Hidden
  610. * elements are excluded.
  611. */
  612. function getStatusText( node ) {
  613. var text = '';
  614. // Text node
  615. if( node.nodeType === 3 ) {
  616. text += node.textContent;
  617. }
  618. // Element node
  619. else if( node.nodeType === 1 ) {
  620. var isAriaHidden = node.getAttribute( 'aria-hidden' );
  621. var isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
  622. if( isAriaHidden !== 'true' && !isDisplayHidden ) {
  623. toArray( node.childNodes ).forEach( function( child ) {
  624. text += getStatusText( child );
  625. } );
  626. }
  627. }
  628. return text;
  629. }
  630. /**
  631. * Configures the presentation for printing to a static
  632. * PDF.
  633. */
  634. function setupPDF() {
  635. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  636. // Dimensions of the PDF pages
  637. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  638. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  639. // Dimensions of slides within the pages
  640. var slideWidth = slideSize.width,
  641. slideHeight = slideSize.height;
  642. // Let the browser know what page size we want to print
  643. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
  644. // Limit the size of certain elements to the dimensions of the slide
  645. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  646. document.body.classList.add( 'print-pdf' );
  647. document.body.style.width = pageWidth + 'px';
  648. document.body.style.height = pageHeight + 'px';
  649. // Make sure stretch elements fit on slide
  650. layoutSlideContents( slideWidth, slideHeight );
  651. // Compute slide numbers now, before we start duplicating slides
  652. var doingSlideNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
  653. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  654. slide.setAttribute( 'data-slide-number', getSlideNumber( slide ) );
  655. } );
  656. // Slide and slide background layout
  657. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  658. // Vertical stacks are not centred since their section
  659. // children will be
  660. if( slide.classList.contains( 'stack' ) === false ) {
  661. // Center the slide inside of the page, giving the slide some margin
  662. var left = ( pageWidth - slideWidth ) / 2,
  663. top = ( pageHeight - slideHeight ) / 2;
  664. var contentHeight = slide.scrollHeight;
  665. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  666. // Adhere to configured pages per slide limit
  667. numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
  668. // Center slides vertically
  669. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  670. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  671. }
  672. // Wrap the slide in a page element and hide its overflow
  673. // so that no page ever flows onto another
  674. var page = document.createElement( 'div' );
  675. page.className = 'pdf-page';
  676. page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
  677. slide.parentNode.insertBefore( page, slide );
  678. page.appendChild( slide );
  679. // Position the slide inside of the page
  680. slide.style.left = left + 'px';
  681. slide.style.top = top + 'px';
  682. slide.style.width = slideWidth + 'px';
  683. if( slide.slideBackgroundElement ) {
  684. page.insertBefore( slide.slideBackgroundElement, slide );
  685. }
  686. // Inject notes if `showNotes` is enabled
  687. if( config.showNotes ) {
  688. // Are there notes for this slide?
  689. var notes = getSlideNotes( slide );
  690. if( notes ) {
  691. var notesSpacing = 8;
  692. var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
  693. var notesElement = document.createElement( 'div' );
  694. notesElement.classList.add( 'speaker-notes' );
  695. notesElement.classList.add( 'speaker-notes-pdf' );
  696. notesElement.setAttribute( 'data-layout', notesLayout );
  697. notesElement.innerHTML = notes;
  698. if( notesLayout === 'separate-page' ) {
  699. page.parentNode.insertBefore( notesElement, page.nextSibling );
  700. }
  701. else {
  702. notesElement.style.left = notesSpacing + 'px';
  703. notesElement.style.bottom = notesSpacing + 'px';
  704. notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
  705. page.appendChild( notesElement );
  706. }
  707. }
  708. }
  709. // Inject slide numbers if `slideNumbers` are enabled
  710. if( doingSlideNumbers ) {
  711. var numberElement = document.createElement( 'div' );
  712. numberElement.classList.add( 'slide-number' );
  713. numberElement.classList.add( 'slide-number-pdf' );
  714. numberElement.innerHTML = slide.getAttribute( 'data-slide-number' );
  715. page.appendChild( numberElement );
  716. }
  717. // Copy page and show fragments one after another
  718. if( config.pdfSeparateFragments ) {
  719. // Each fragment 'group' is an array containing one or more
  720. // fragments. Multiple fragments that appear at the same time
  721. // are part of the same group.
  722. var fragmentGroups = sortFragments( page.querySelectorAll( '.fragment' ), true );
  723. var previousFragmentStep;
  724. var previousPage;
  725. fragmentGroups.forEach( function( fragments ) {
  726. // Remove 'current-fragment' from the previous group
  727. if( previousFragmentStep ) {
  728. previousFragmentStep.forEach( function( fragment ) {
  729. fragment.classList.remove( 'current-fragment' );
  730. } );
  731. }
  732. // Show the fragments for the current index
  733. fragments.forEach( function( fragment ) {
  734. fragment.classList.add( 'visible', 'current-fragment' );
  735. } );
  736. // Create a separate page for the current fragment state
  737. var clonedPage = page.cloneNode( true );
  738. page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
  739. previousFragmentStep = fragments;
  740. previousPage = clonedPage;
  741. } );
  742. // Reset the first/original page so that all fragments are hidden
  743. fragmentGroups.forEach( function( fragments ) {
  744. fragments.forEach( function( fragment ) {
  745. fragment.classList.remove( 'visible', 'current-fragment' );
  746. } );
  747. } );
  748. }
  749. // Show all fragments
  750. else {
  751. toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) {
  752. fragment.classList.add( 'visible' );
  753. } );
  754. }
  755. }
  756. } );
  757. // Notify subscribers that the PDF layout is good to go
  758. dispatchEvent( 'pdf-ready' );
  759. }
  760. /**
  761. * This is an unfortunate necessity. Some actions – such as
  762. * an input field being focused in an iframe or using the
  763. * keyboard to expand text selection beyond the bounds of
  764. * a slide – can trigger our content to be pushed out of view.
  765. * This scrolling can not be prevented by hiding overflow in
  766. * CSS (we already do) so we have to resort to repeatedly
  767. * checking if the slides have been offset :(
  768. */
  769. function setupScrollPrevention() {
  770. setInterval( function() {
  771. if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
  772. dom.wrapper.scrollTop = 0;
  773. dom.wrapper.scrollLeft = 0;
  774. }
  775. }, 1000 );
  776. }
  777. /**
  778. * Creates an HTML element and returns a reference to it.
  779. * If the element already exists the existing instance will
  780. * be returned.
  781. *
  782. * @param {HTMLElement} container
  783. * @param {string} tagname
  784. * @param {string} classname
  785. * @param {string} innerHTML
  786. *
  787. * @return {HTMLElement}
  788. */
  789. function createSingletonNode( container, tagname, classname, innerHTML ) {
  790. // Find all nodes matching the description
  791. var nodes = container.querySelectorAll( '.' + classname );
  792. // Check all matches to find one which is a direct child of
  793. // the specified container
  794. for( var i = 0; i < nodes.length; i++ ) {
  795. var testNode = nodes[i];
  796. if( testNode.parentNode === container ) {
  797. return testNode;
  798. }
  799. }
  800. // If no node was found, create it now
  801. var node = document.createElement( tagname );
  802. node.className = classname;
  803. if( typeof innerHTML === 'string' ) {
  804. node.innerHTML = innerHTML;
  805. }
  806. container.appendChild( node );
  807. return node;
  808. }
  809. /**
  810. * Creates the slide background elements and appends them
  811. * to the background container. One element is created per
  812. * slide no matter if the given slide has visible background.
  813. */
  814. function createBackgrounds() {
  815. var printMode = isPrintingPDF();
  816. // Clear prior backgrounds
  817. dom.background.innerHTML = '';
  818. dom.background.classList.add( 'no-transition' );
  819. // Iterate over all horizontal slides
  820. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  821. var backgroundStack = createBackground( slideh, dom.background );
  822. // Iterate over all vertical slides
  823. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  824. createBackground( slidev, backgroundStack );
  825. backgroundStack.classList.add( 'stack' );
  826. } );
  827. } );
  828. // Add parallax background if specified
  829. if( config.parallaxBackgroundImage ) {
  830. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  831. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  832. dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat;
  833. dom.background.style.backgroundPosition = config.parallaxBackgroundPosition;
  834. // Make sure the below properties are set on the element - these properties are
  835. // needed for proper transitions to be set on the element via CSS. To remove
  836. // annoying background slide-in effect when the presentation starts, apply
  837. // these properties after short time delay
  838. setTimeout( function() {
  839. dom.wrapper.classList.add( 'has-parallax-background' );
  840. }, 1 );
  841. }
  842. else {
  843. dom.background.style.backgroundImage = '';
  844. dom.wrapper.classList.remove( 'has-parallax-background' );
  845. }
  846. }
  847. /**
  848. * Creates a background for the given slide.
  849. *
  850. * @param {HTMLElement} slide
  851. * @param {HTMLElement} container The element that the background
  852. * should be appended to
  853. * @return {HTMLElement} New background div
  854. */
  855. function createBackground( slide, container ) {
  856. // Main slide background element
  857. var element = document.createElement( 'div' );
  858. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  859. // Inner background element that wraps images/videos/iframes
  860. var contentElement = document.createElement( 'div' );
  861. contentElement.className = 'slide-background-content';
  862. element.appendChild( contentElement );
  863. container.appendChild( element );
  864. slide.slideBackgroundElement = element;
  865. slide.slideBackgroundContentElement = contentElement;
  866. // Syncs the background to reflect all current background settings
  867. syncBackground( slide );
  868. return element;
  869. }
  870. /**
  871. * Renders all of the visual properties of a slide background
  872. * based on the various background attributes.
  873. *
  874. * @param {HTMLElement} slide
  875. */
  876. function syncBackground( slide ) {
  877. var element = slide.slideBackgroundElement,
  878. contentElement = slide.slideBackgroundContentElement;
  879. // Reset the prior background state in case this is not the
  880. // initial sync
  881. slide.classList.remove( 'has-dark-background' );
  882. slide.classList.remove( 'has-light-background' );
  883. element.removeAttribute( 'data-loaded' );
  884. element.removeAttribute( 'data-background-hash' );
  885. element.removeAttribute( 'data-background-size' );
  886. element.removeAttribute( 'data-background-transition' );
  887. element.style.backgroundColor = '';
  888. contentElement.style.backgroundSize = '';
  889. contentElement.style.backgroundRepeat = '';
  890. contentElement.style.backgroundPosition = '';
  891. contentElement.style.backgroundImage = '';
  892. contentElement.style.opacity = '';
  893. contentElement.innerHTML = '';
  894. var data = {
  895. background: slide.getAttribute( 'data-background' ),
  896. backgroundSize: slide.getAttribute( 'data-background-size' ),
  897. backgroundImage: slide.getAttribute( 'data-background-image' ),
  898. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  899. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  900. backgroundColor: slide.getAttribute( 'data-background-color' ),
  901. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  902. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  903. backgroundTransition: slide.getAttribute( 'data-background-transition' ),
  904. backgroundOpacity: slide.getAttribute( 'data-background-opacity' )
  905. };
  906. if( data.background ) {
  907. // Auto-wrap image urls in url(...)
  908. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) {
  909. slide.setAttribute( 'data-background-image', data.background );
  910. }
  911. else {
  912. element.style.background = data.background;
  913. }
  914. }
  915. // Create a hash for this combination of background settings.
  916. // This is used to determine when two slide backgrounds are
  917. // the same.
  918. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  919. element.setAttribute( 'data-background-hash', data.background +
  920. data.backgroundSize +
  921. data.backgroundImage +
  922. data.backgroundVideo +
  923. data.backgroundIframe +
  924. data.backgroundColor +
  925. data.backgroundRepeat +
  926. data.backgroundPosition +
  927. data.backgroundTransition +
  928. data.backgroundOpacity );
  929. }
  930. // Additional and optional background properties
  931. if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );
  932. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  933. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  934. if( slide.hasAttribute( 'data-preload' ) ) element.setAttribute( 'data-preload', '' );
  935. // Background image options are set on the content wrapper
  936. if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
  937. if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;
  938. if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;
  939. if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;
  940. // If this slide has a background color, we add a class that
  941. // signals if it is light or dark. If the slide has no background
  942. // color, no class will be added
  943. var contrastColor = data.backgroundColor;
  944. // If no bg color was found, check the computed background
  945. if( !contrastColor ) {
  946. var computedBackgroundStyle = window.getComputedStyle( element );
  947. if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
  948. contrastColor = computedBackgroundStyle.backgroundColor;
  949. }
  950. }
  951. if( contrastColor ) {
  952. var rgb = colorToRgb( contrastColor );
  953. // Ignore fully transparent backgrounds. Some browsers return
  954. // rgba(0,0,0,0) when reading the computed background color of
  955. // an element with no background
  956. if( rgb && rgb.a !== 0 ) {
  957. if( colorBrightness( contrastColor ) < 128 ) {
  958. slide.classList.add( 'has-dark-background' );
  959. }
  960. else {
  961. slide.classList.add( 'has-light-background' );
  962. }
  963. }
  964. }
  965. }
  966. /**
  967. * Registers a listener to postMessage events, this makes it
  968. * possible to call all reveal.js API methods from another
  969. * window. For example:
  970. *
  971. * revealWindow.postMessage( JSON.stringify({
  972. * method: 'slide',
  973. * args: [ 2 ]
  974. * }), '*' );
  975. */
  976. function setupPostMessage() {
  977. if( config.postMessage ) {
  978. window.addEventListener( 'message', function ( event ) {
  979. var data = event.data;
  980. // Make sure we're dealing with JSON
  981. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  982. data = JSON.parse( data );
  983. // Check if the requested method can be found
  984. if( data.method && typeof Reveal[data.method] === 'function' ) {
  985. var result = Reveal[data.method].apply( Reveal, data.args );
  986. // Dispatch a postMessage event with the returned value from
  987. // our method invocation for getter functions
  988. dispatchPostMessage( 'callback', { method: data.method, result: result } );
  989. }
  990. }
  991. }, false );
  992. }
  993. }
  994. /**
  995. * Applies the configuration settings from the config
  996. * object. May be called multiple times.
  997. *
  998. * @param {object} options
  999. */
  1000. function configure( options ) {
  1001. var oldTransition = config.transition;
  1002. // New config options may be passed when this method
  1003. // is invoked through the API after initialization
  1004. if( typeof options === 'object' ) extend( config, options );
  1005. // Abort if reveal.js hasn't finished loading, config
  1006. // changes will be applied automatically once loading
  1007. // finishes
  1008. if( loaded === false ) return;
  1009. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  1010. // Remove the previously configured transition class
  1011. dom.wrapper.classList.remove( oldTransition );
  1012. // Force linear transition based on browser capabilities
  1013. if( features.transforms3d === false ) config.transition = 'linear';
  1014. dom.wrapper.classList.add( config.transition );
  1015. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  1016. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  1017. dom.controls.style.display = config.controls ? 'block' : 'none';
  1018. dom.progress.style.display = config.progress ? 'block' : 'none';
  1019. dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout );
  1020. dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
  1021. if( config.shuffle ) {
  1022. shuffle();
  1023. }
  1024. if( config.rtl ) {
  1025. dom.wrapper.classList.add( 'rtl' );
  1026. }
  1027. else {
  1028. dom.wrapper.classList.remove( 'rtl' );
  1029. }
  1030. if( config.center ) {
  1031. dom.wrapper.classList.add( 'center' );
  1032. }
  1033. else {
  1034. dom.wrapper.classList.remove( 'center' );
  1035. }
  1036. // Exit the paused mode if it was configured off
  1037. if( config.pause === false ) {
  1038. resume();
  1039. }
  1040. if( config.showNotes ) {
  1041. dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
  1042. }
  1043. if( config.mouseWheel ) {
  1044. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1045. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1046. }
  1047. else {
  1048. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1049. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1050. }
  1051. // Rolling 3D links
  1052. if( config.rollingLinks ) {
  1053. enableRollingLinks();
  1054. }
  1055. else {
  1056. disableRollingLinks();
  1057. }
  1058. // Auto-hide the mouse pointer when its inactive
  1059. if( config.hideInactiveCursor ) {
  1060. document.addEventListener( 'mousemove', onDocumentCursorActive, false );
  1061. document.addEventListener( 'mousedown', onDocumentCursorActive, false );
  1062. }
  1063. else {
  1064. showCursor();
  1065. document.removeEventListener( 'mousemove', onDocumentCursorActive, false );
  1066. document.removeEventListener( 'mousedown', onDocumentCursorActive, false );
  1067. }
  1068. // Iframe link previews
  1069. if( config.previewLinks ) {
  1070. enablePreviewLinks();
  1071. disablePreviewLinks( '[data-preview-link=false]' );
  1072. }
  1073. else {
  1074. disablePreviewLinks();
  1075. enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
  1076. }
  1077. // Remove existing auto-slide controls
  1078. if( autoSlidePlayer ) {
  1079. autoSlidePlayer.destroy();
  1080. autoSlidePlayer = null;
  1081. }
  1082. // Generate auto-slide controls if needed
  1083. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  1084. autoSlidePlayer = new Playback( dom.wrapper, function() {
  1085. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  1086. } );
  1087. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  1088. autoSlidePaused = false;
  1089. }
  1090. // When fragments are turned off they should be visible
  1091. if( config.fragments === false ) {
  1092. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  1093. element.classList.add( 'visible' );
  1094. element.classList.remove( 'current-fragment' );
  1095. } );
  1096. }
  1097. // Slide numbers
  1098. var slideNumberDisplay = 'none';
  1099. if( config.slideNumber && !isPrintingPDF() ) {
  1100. if( config.showSlideNumber === 'all' ) {
  1101. slideNumberDisplay = 'block';
  1102. }
  1103. else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) {
  1104. slideNumberDisplay = 'block';
  1105. }
  1106. }
  1107. dom.slideNumber.style.display = slideNumberDisplay;
  1108. // Add the navigation mode to the DOM so we can adjust styling
  1109. if( config.navigationMode !== 'default' ) {
  1110. dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );
  1111. }
  1112. else {
  1113. dom.wrapper.removeAttribute( 'data-navigation-mode' );
  1114. }
  1115. // Define our contextual list of keyboard shortcuts
  1116. if( config.navigationMode === 'linear' ) {
  1117. keyboardShortcuts['&#8594; , &#8595; , SPACE , N , L , J'] = 'Next slide';
  1118. keyboardShortcuts['&#8592; , &#8593; , P , H , K'] = 'Previous slide';
  1119. }
  1120. else {
  1121. keyboardShortcuts['N , SPACE'] = 'Next slide';
  1122. keyboardShortcuts['P'] = 'Previous slide';
  1123. keyboardShortcuts['&#8592; , H'] = 'Navigate left';
  1124. keyboardShortcuts['&#8594; , L'] = 'Navigate right';
  1125. keyboardShortcuts['&#8593; , K'] = 'Navigate up';
  1126. keyboardShortcuts['&#8595; , J'] = 'Navigate down';
  1127. }
  1128. keyboardShortcuts['Home , Shift &#8592;'] = 'First slide';
  1129. keyboardShortcuts['End , Shift &#8594;'] = 'Last slide';
  1130. keyboardShortcuts['B , .'] = 'Pause';
  1131. keyboardShortcuts['F'] = 'Fullscreen';
  1132. keyboardShortcuts['ESC, O'] = 'Slide overview';
  1133. sync();
  1134. }
  1135. /**
  1136. * Binds all event listeners.
  1137. */
  1138. function addEventListeners() {
  1139. eventsAreBound = true;
  1140. window.addEventListener( 'hashchange', onWindowHashChange, false );
  1141. window.addEventListener( 'resize', onWindowResize, false );
  1142. if( config.touch ) {
  1143. if( 'onpointerdown' in window ) {
  1144. // Use W3C pointer events
  1145. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  1146. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  1147. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  1148. }
  1149. else if( window.navigator.msPointerEnabled ) {
  1150. // IE 10 uses prefixed version of pointer events
  1151. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  1152. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  1153. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  1154. }
  1155. else {
  1156. // Fall back to touch events
  1157. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  1158. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  1159. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  1160. }
  1161. }
  1162. if( config.keyboard ) {
  1163. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  1164. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  1165. }
  1166. if( config.progress && dom.progress ) {
  1167. dom.progress.addEventListener( 'click', onProgressClicked, false );
  1168. }
  1169. dom.pauseOverlay.addEventListener( 'click', resume, false );
  1170. if( config.focusBodyOnPageVisibilityChange ) {
  1171. var visibilityChange;
  1172. if( 'hidden' in document ) {
  1173. visibilityChange = 'visibilitychange';
  1174. }
  1175. else if( 'msHidden' in document ) {
  1176. visibilityChange = 'msvisibilitychange';
  1177. }
  1178. else if( 'webkitHidden' in document ) {
  1179. visibilityChange = 'webkitvisibilitychange';
  1180. }
  1181. if( visibilityChange ) {
  1182. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  1183. }
  1184. }
  1185. // Listen to both touch and click events, in case the device
  1186. // supports both
  1187. var pointerEvents = [ 'touchstart', 'click' ];
  1188. // Only support touch for Android, fixes double navigations in
  1189. // stock browser
  1190. if( UA.match( /android/gi ) ) {
  1191. pointerEvents = [ 'touchstart' ];
  1192. }
  1193. pointerEvents.forEach( function( eventName ) {
  1194. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  1195. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  1196. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  1197. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  1198. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  1199. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  1200. } );
  1201. }
  1202. /**
  1203. * Unbinds all event listeners.
  1204. */
  1205. function removeEventListeners() {
  1206. eventsAreBound = false;
  1207. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  1208. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  1209. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  1210. window.removeEventListener( 'resize', onWindowResize, false );
  1211. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  1212. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  1213. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  1214. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  1215. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  1216. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  1217. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  1218. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  1219. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  1220. dom.pauseOverlay.removeEventListener( 'click', resume, false );
  1221. if ( config.progress && dom.progress ) {
  1222. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  1223. }
  1224. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  1225. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  1226. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  1227. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  1228. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  1229. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  1230. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  1231. } );
  1232. }
  1233. /**
  1234. * Registers a new plugin with this reveal.js instance.
  1235. *
  1236. * reveal.js waits for all regisered plugins to initialize
  1237. * before considering itself ready, as long as the plugin
  1238. * is registered before calling `Reveal.initialize()`.
  1239. */
  1240. function registerPlugin( id, plugin ) {
  1241. if( plugins[id] === undefined ) {
  1242. plugins[id] = plugin;
  1243. // If a plugin is registered after reveal.js is loaded,
  1244. // initialize it right away
  1245. if( loaded && typeof plugin.init === 'function' ) {
  1246. plugin.init();
  1247. }
  1248. }
  1249. else {
  1250. console.warn( 'reveal.js: "'+ id +'" plugin has already been registered' );
  1251. }
  1252. }
  1253. /**
  1254. * Checks if a specific plugin has been registered.
  1255. *
  1256. * @param {String} id Unique plugin identifier
  1257. */
  1258. function hasPlugin( id ) {
  1259. return !!plugins[id];
  1260. }
  1261. /**
  1262. * Returns the specific plugin instance, if a plugin
  1263. * with the given ID has been registered.
  1264. *
  1265. * @param {String} id Unique plugin identifier
  1266. */
  1267. function getPlugin( id ) {
  1268. return plugins[id];
  1269. }
  1270. /**
  1271. * Add a custom key binding with optional description to
  1272. * be added to the help screen.
  1273. */
  1274. function addKeyBinding( binding, callback ) {
  1275. if( typeof binding === 'object' && binding.keyCode ) {
  1276. registeredKeyBindings[binding.keyCode] = {
  1277. callback: callback,
  1278. key: binding.key,
  1279. description: binding.description
  1280. };
  1281. }
  1282. else {
  1283. registeredKeyBindings[binding] = {
  1284. callback: callback,
  1285. key: null,
  1286. description: null
  1287. };
  1288. }
  1289. }
  1290. /**
  1291. * Removes the specified custom key binding.
  1292. */
  1293. function removeKeyBinding( keyCode ) {
  1294. delete registeredKeyBindings[keyCode];
  1295. }
  1296. /**
  1297. * Extend object a with the properties of object b.
  1298. * If there's a conflict, object b takes precedence.
  1299. *
  1300. * @param {object} a
  1301. * @param {object} b
  1302. */
  1303. function extend( a, b ) {
  1304. for( var i in b ) {
  1305. a[ i ] = b[ i ];
  1306. }
  1307. return a;
  1308. }
  1309. /**
  1310. * Converts the target object to an array.
  1311. *
  1312. * @param {object} o
  1313. * @return {object[]}
  1314. */
  1315. function toArray( o ) {
  1316. return Array.prototype.slice.call( o );
  1317. }
  1318. /**
  1319. * Utility for deserializing a value.
  1320. *
  1321. * @param {*} value
  1322. * @return {*}
  1323. */
  1324. function deserialize( value ) {
  1325. if( typeof value === 'string' ) {
  1326. if( value === 'null' ) return null;
  1327. else if( value === 'true' ) return true;
  1328. else if( value === 'false' ) return false;
  1329. else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
  1330. }
  1331. return value;
  1332. }
  1333. /**
  1334. * Measures the distance in pixels between point a
  1335. * and point b.
  1336. *
  1337. * @param {object} a point with x/y properties
  1338. * @param {object} b point with x/y properties
  1339. *
  1340. * @return {number}
  1341. */
  1342. function distanceBetween( a, b ) {
  1343. var dx = a.x - b.x,
  1344. dy = a.y - b.y;
  1345. return Math.sqrt( dx*dx + dy*dy );
  1346. }
  1347. /**
  1348. * Applies a CSS transform to the target element.
  1349. *
  1350. * @param {HTMLElement} element
  1351. * @param {string} transform
  1352. */
  1353. function transformElement( element, transform ) {
  1354. element.style.WebkitTransform = transform;
  1355. element.style.MozTransform = transform;
  1356. element.style.msTransform = transform;
  1357. element.style.transform = transform;
  1358. }
  1359. /**
  1360. * Applies CSS transforms to the slides container. The container
  1361. * is transformed from two separate sources: layout and the overview
  1362. * mode.
  1363. *
  1364. * @param {object} transforms
  1365. */
  1366. function transformSlides( transforms ) {
  1367. // Pick up new transforms from arguments
  1368. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  1369. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  1370. // Apply the transforms to the slides container
  1371. if( slidesTransform.layout ) {
  1372. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  1373. }
  1374. else {
  1375. transformElement( dom.slides, slidesTransform.overview );
  1376. }
  1377. }
  1378. /**
  1379. * Injects the given CSS styles into the DOM.
  1380. *
  1381. * @param {string} value
  1382. */
  1383. function injectStyleSheet( value ) {
  1384. var tag = document.createElement( 'style' );
  1385. tag.type = 'text/css';
  1386. if( tag.styleSheet ) {
  1387. tag.styleSheet.cssText = value;
  1388. }
  1389. else {
  1390. tag.appendChild( document.createTextNode( value ) );
  1391. }
  1392. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  1393. }
  1394. /**
  1395. * Find the closest parent that matches the given
  1396. * selector.
  1397. *
  1398. * @param {HTMLElement} target The child element
  1399. * @param {String} selector The CSS selector to match
  1400. * the parents against
  1401. *
  1402. * @return {HTMLElement} The matched parent or null
  1403. * if no matching parent was found
  1404. */
  1405. function closestParent( target, selector ) {
  1406. var parent = target.parentNode;
  1407. while( parent ) {
  1408. // There's some overhead doing this each time, we don't
  1409. // want to rewrite the element prototype but should still
  1410. // be enough to feature detect once at startup...
  1411. var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
  1412. // If we find a match, we're all set
  1413. if( matchesMethod && matchesMethod.call( parent, selector ) ) {
  1414. return parent;
  1415. }
  1416. // Keep searching
  1417. parent = parent.parentNode;
  1418. }
  1419. return null;
  1420. }
  1421. /**
  1422. * Converts various color input formats to an {r:0,g:0,b:0} object.
  1423. *
  1424. * @param {string} color The string representation of a color
  1425. * @example
  1426. * colorToRgb('#000');
  1427. * @example
  1428. * colorToRgb('#000000');
  1429. * @example
  1430. * colorToRgb('rgb(0,0,0)');
  1431. * @example
  1432. * colorToRgb('rgba(0,0,0)');
  1433. *
  1434. * @return {{r: number, g: number, b: number, [a]: number}|null}
  1435. */
  1436. function colorToRgb( color ) {
  1437. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  1438. if( hex3 && hex3[1] ) {
  1439. hex3 = hex3[1];
  1440. return {
  1441. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  1442. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  1443. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  1444. };
  1445. }
  1446. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  1447. if( hex6 && hex6[1] ) {
  1448. hex6 = hex6[1];
  1449. return {
  1450. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  1451. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  1452. b: parseInt( hex6.substr( 4, 2 ), 16 )
  1453. };
  1454. }
  1455. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  1456. if( rgb ) {
  1457. return {
  1458. r: parseInt( rgb[1], 10 ),
  1459. g: parseInt( rgb[2], 10 ),
  1460. b: parseInt( rgb[3], 10 )
  1461. };
  1462. }
  1463. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  1464. if( rgba ) {
  1465. return {
  1466. r: parseInt( rgba[1], 10 ),
  1467. g: parseInt( rgba[2], 10 ),
  1468. b: parseInt( rgba[3], 10 ),
  1469. a: parseFloat( rgba[4] )
  1470. };
  1471. }
  1472. return null;
  1473. }
  1474. /**
  1475. * Calculates brightness on a scale of 0-255.
  1476. *
  1477. * @param {string} color See colorToRgb for supported formats.
  1478. * @see {@link colorToRgb}
  1479. */
  1480. function colorBrightness( color ) {
  1481. if( typeof color === 'string' ) color = colorToRgb( color );
  1482. if( color ) {
  1483. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  1484. }
  1485. return null;
  1486. }
  1487. /**
  1488. * Returns the remaining height within the parent of the
  1489. * target element.
  1490. *
  1491. * remaining height = [ configured parent height ] - [ current parent height ]
  1492. *
  1493. * @param {HTMLElement} element
  1494. * @param {number} [height]
  1495. */
  1496. function getRemainingHeight( element, height ) {
  1497. height = height || 0;
  1498. if( element ) {
  1499. var newHeight, oldHeight = element.style.height;
  1500. // Change the .stretch element height to 0 in order find the height of all
  1501. // the other elements
  1502. element.style.height = '0px';
  1503. // In Overview mode, the parent (.slide) height is set of 700px.
  1504. // Restore it temporarily to its natural height.
  1505. element.parentNode.style.height = 'auto';
  1506. newHeight = height - element.parentNode.offsetHeight;
  1507. // Restore the old height, just in case
  1508. element.style.height = oldHeight + 'px';
  1509. // Clear the parent (.slide) height. .removeProperty works in IE9+
  1510. element.parentNode.style.removeProperty('height');
  1511. return newHeight;
  1512. }
  1513. return height;
  1514. }
  1515. /**
  1516. * Checks if this instance is being used to print a PDF.
  1517. */
  1518. function isPrintingPDF() {
  1519. return ( /print-pdf/gi ).test( window.location.search );
  1520. }
  1521. /**
  1522. * Hides the address bar if we're on a mobile device.
  1523. */
  1524. function hideAddressBar() {
  1525. if( config.hideAddressBar && isMobileDevice ) {
  1526. // Events that should trigger the address bar to hide
  1527. window.addEventListener( 'load', removeAddressBar, false );
  1528. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1529. }
  1530. }
  1531. /**
  1532. * Causes the address bar to hide on mobile devices,
  1533. * more vertical space ftw.
  1534. */
  1535. function removeAddressBar() {
  1536. setTimeout( function() {
  1537. window.scrollTo( 0, 1 );
  1538. }, 10 );
  1539. }
  1540. /**
  1541. * Dispatches an event of the specified type from the
  1542. * reveal DOM element.
  1543. */
  1544. function dispatchEvent( type, args ) {
  1545. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1546. event.initEvent( type, true, true );
  1547. extend( event, args );
  1548. dom.wrapper.dispatchEvent( event );
  1549. // If we're in an iframe, post each reveal.js event to the
  1550. // parent window. Used by the notes plugin
  1551. dispatchPostMessage( type );
  1552. }
  1553. /**
  1554. * Dispatched a postMessage of the given type from our window.
  1555. */
  1556. function dispatchPostMessage( type, data ) {
  1557. if( config.postMessageEvents && window.parent !== window.self ) {
  1558. var message = {
  1559. namespace: 'reveal',
  1560. eventName: type,
  1561. state: getState()
  1562. };
  1563. extend( message, data );
  1564. window.parent.postMessage( JSON.stringify( message ), '*' );
  1565. }
  1566. }
  1567. /**
  1568. * Wrap all links in 3D goodness.
  1569. */
  1570. function enableRollingLinks() {
  1571. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1572. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1573. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1574. var anchor = anchors[i];
  1575. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1576. var span = document.createElement('span');
  1577. span.setAttribute('data-title', anchor.text);
  1578. span.innerHTML = anchor.innerHTML;
  1579. anchor.classList.add( 'roll' );
  1580. anchor.innerHTML = '';
  1581. anchor.appendChild(span);
  1582. }
  1583. }
  1584. }
  1585. }
  1586. /**
  1587. * Unwrap all 3D links.
  1588. */
  1589. function disableRollingLinks() {
  1590. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1591. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1592. var anchor = anchors[i];
  1593. var span = anchor.querySelector( 'span' );
  1594. if( span ) {
  1595. anchor.classList.remove( 'roll' );
  1596. anchor.innerHTML = span.innerHTML;
  1597. }
  1598. }
  1599. }
  1600. /**
  1601. * Bind preview frame links.
  1602. *
  1603. * @param {string} [selector=a] - selector for anchors
  1604. */
  1605. function enablePreviewLinks( selector ) {
  1606. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1607. anchors.forEach( function( element ) {
  1608. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1609. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1610. }
  1611. } );
  1612. }
  1613. /**
  1614. * Unbind preview frame links.
  1615. */
  1616. function disablePreviewLinks( selector ) {
  1617. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1618. anchors.forEach( function( element ) {
  1619. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1620. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1621. }
  1622. } );
  1623. }
  1624. /**
  1625. * Opens a preview window for the target URL.
  1626. *
  1627. * @param {string} url - url for preview iframe src
  1628. */
  1629. function showPreview( url ) {
  1630. closeOverlay();
  1631. dom.overlay = document.createElement( 'div' );
  1632. dom.overlay.classList.add( 'overlay' );
  1633. dom.overlay.classList.add( 'overlay-preview' );
  1634. dom.wrapper.appendChild( dom.overlay );
  1635. dom.overlay.innerHTML = [
  1636. '<header>',
  1637. '<a class="close" href="#"><span class="icon"></span></a>',
  1638. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1639. '</header>',
  1640. '<div class="spinner"></div>',
  1641. '<div class="viewport">',
  1642. '<iframe src="'+ url +'"></iframe>',
  1643. '<small class="viewport-inner">',
  1644. '<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>',
  1645. '</small>',
  1646. '</div>'
  1647. ].join('');
  1648. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1649. dom.overlay.classList.add( 'loaded' );
  1650. }, false );
  1651. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1652. closeOverlay();
  1653. event.preventDefault();
  1654. }, false );
  1655. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1656. closeOverlay();
  1657. }, false );
  1658. setTimeout( function() {
  1659. dom.overlay.classList.add( 'visible' );
  1660. }, 1 );
  1661. }
  1662. /**
  1663. * Open or close help overlay window.
  1664. *
  1665. * @param {Boolean} [override] Flag which overrides the
  1666. * toggle logic and forcibly sets the desired state. True means
  1667. * help is open, false means it's closed.
  1668. */
  1669. function toggleHelp( override ){
  1670. if( typeof override === 'boolean' ) {
  1671. override ? showHelp() : closeOverlay();
  1672. }
  1673. else {
  1674. if( dom.overlay ) {
  1675. closeOverlay();
  1676. }
  1677. else {
  1678. showHelp();
  1679. }
  1680. }
  1681. }
  1682. /**
  1683. * Opens an overlay window with help material.
  1684. */
  1685. function showHelp() {
  1686. if( config.help ) {
  1687. closeOverlay();
  1688. dom.overlay = document.createElement( 'div' );
  1689. dom.overlay.classList.add( 'overlay' );
  1690. dom.overlay.classList.add( 'overlay-help' );
  1691. dom.wrapper.appendChild( dom.overlay );
  1692. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1693. html += '<table><th>KEY</th><th>ACTION</th>';
  1694. for( var key in keyboardShortcuts ) {
  1695. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1696. }
  1697. // Add custom key bindings that have associated descriptions
  1698. for( var binding in registeredKeyBindings ) {
  1699. if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) {
  1700. html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</td></tr>';
  1701. }
  1702. }
  1703. html += '</table>';
  1704. dom.overlay.innerHTML = [
  1705. '<header>',
  1706. '<a class="close" href="#"><span class="icon"></span></a>',
  1707. '</header>',
  1708. '<div class="viewport">',
  1709. '<div class="viewport-inner">'+ html +'</div>',
  1710. '</div>'
  1711. ].join('');
  1712. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1713. closeOverlay();
  1714. event.preventDefault();
  1715. }, false );
  1716. setTimeout( function() {
  1717. dom.overlay.classList.add( 'visible' );
  1718. }, 1 );
  1719. }
  1720. }
  1721. /**
  1722. * Closes any currently open overlay.
  1723. */
  1724. function closeOverlay() {
  1725. if( dom.overlay ) {
  1726. dom.overlay.parentNode.removeChild( dom.overlay );
  1727. dom.overlay = null;
  1728. }
  1729. }
  1730. /**
  1731. * Applies JavaScript-controlled layout rules to the
  1732. * presentation.
  1733. */
  1734. function layout() {
  1735. if( dom.wrapper && !isPrintingPDF() ) {
  1736. if( !config.disableLayout ) {
  1737. // On some mobile devices '100vh' is taller than the visible
  1738. // viewport which leads to part of the presentation being
  1739. // cut off. To work around this we define our own '--vh' custom
  1740. // property where 100x adds up to the correct height.
  1741. //
  1742. // https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
  1743. if( isMobileDevice ) {
  1744. document.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );
  1745. }
  1746. var size = getComputedSlideSize();
  1747. var oldScale = scale;
  1748. // Layout the contents of the slides
  1749. layoutSlideContents( config.width, config.height );
  1750. dom.slides.style.width = size.width + 'px';
  1751. dom.slides.style.height = size.height + 'px';
  1752. // Determine scale of content to fit within available space
  1753. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1754. // Respect max/min scale settings
  1755. scale = Math.max( scale, config.minScale );
  1756. scale = Math.min( scale, config.maxScale );
  1757. // Don't apply any scaling styles if scale is 1
  1758. if( scale === 1 ) {
  1759. dom.slides.style.zoom = '';
  1760. dom.slides.style.left = '';
  1761. dom.slides.style.top = '';
  1762. dom.slides.style.bottom = '';
  1763. dom.slides.style.right = '';
  1764. transformSlides( { layout: '' } );
  1765. }
  1766. else {
  1767. // Zoom Scaling
  1768. // Content remains crisp no matter how much we scale. Side
  1769. // effects are minor differences in text layout and iframe
  1770. // viewports changing size. A 200x200 iframe viewport in a
  1771. // 2x zoomed presentation ends up having a 400x400 viewport.
  1772. if( scale > 1 && features.zoom && window.devicePixelRatio < 2 ) {
  1773. dom.slides.style.zoom = scale;
  1774. dom.slides.style.left = '';
  1775. dom.slides.style.top = '';
  1776. dom.slides.style.bottom = '';
  1777. dom.slides.style.right = '';
  1778. transformSlides( { layout: '' } );
  1779. }
  1780. // Transform Scaling
  1781. // Content layout remains the exact same when scaled up.
  1782. // Side effect is content becoming blurred, especially with
  1783. // high scale values on ldpi screens.
  1784. else {
  1785. dom.slides.style.zoom = '';
  1786. dom.slides.style.left = '50%';
  1787. dom.slides.style.top = '50%';
  1788. dom.slides.style.bottom = 'auto';
  1789. dom.slides.style.right = 'auto';
  1790. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1791. }
  1792. }
  1793. // Select all slides, vertical and horizontal
  1794. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1795. for( var i = 0, len = slides.length; i < len; i++ ) {
  1796. var slide = slides[ i ];
  1797. // Don't bother updating invisible slides
  1798. if( slide.style.display === 'none' ) {
  1799. continue;
  1800. }
  1801. if( config.center || slide.classList.contains( 'center' ) ) {
  1802. // Vertical stacks are not centred since their section
  1803. // children will be
  1804. if( slide.classList.contains( 'stack' ) ) {
  1805. slide.style.top = 0;
  1806. }
  1807. else {
  1808. slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
  1809. }
  1810. }
  1811. else {
  1812. slide.style.top = '';
  1813. }
  1814. }
  1815. if( oldScale !== scale ) {
  1816. dispatchEvent( 'resize', {
  1817. 'oldScale': oldScale,
  1818. 'scale': scale,
  1819. 'size': size
  1820. } );
  1821. }
  1822. }
  1823. updateProgress();
  1824. updateParallax();
  1825. if( isOverview() ) {
  1826. updateOverview();
  1827. }
  1828. }
  1829. }
  1830. /**
  1831. * Applies layout logic to the contents of all slides in
  1832. * the presentation.
  1833. *
  1834. * @param {string|number} width
  1835. * @param {string|number} height
  1836. */
  1837. function layoutSlideContents( width, height ) {
  1838. // Handle sizing of elements with the 'stretch' class
  1839. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1840. // Determine how much vertical space we can use
  1841. var remainingHeight = getRemainingHeight( element, height );
  1842. // Consider the aspect ratio of media elements
  1843. if( /(img|video)/gi.test( element.nodeName ) ) {
  1844. var nw = element.naturalWidth || element.videoWidth,
  1845. nh = element.naturalHeight || element.videoHeight;
  1846. var es = Math.min( width / nw, remainingHeight / nh );
  1847. element.style.width = ( nw * es ) + 'px';
  1848. element.style.height = ( nh * es ) + 'px';
  1849. }
  1850. else {
  1851. element.style.width = width + 'px';
  1852. element.style.height = remainingHeight + 'px';
  1853. }
  1854. } );
  1855. }
  1856. /**
  1857. * Calculates the computed pixel size of our slides. These
  1858. * values are based on the width and height configuration
  1859. * options.
  1860. *
  1861. * @param {number} [presentationWidth=dom.wrapper.offsetWidth]
  1862. * @param {number} [presentationHeight=dom.wrapper.offsetHeight]
  1863. */
  1864. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1865. var size = {
  1866. // Slide size
  1867. width: config.width,
  1868. height: config.height,
  1869. // Presentation size
  1870. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1871. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1872. };
  1873. // Reduce available space by margin
  1874. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1875. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1876. // Slide width may be a percentage of available width
  1877. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1878. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1879. }
  1880. // Slide height may be a percentage of available height
  1881. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1882. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1883. }
  1884. return size;
  1885. }
  1886. /**
  1887. * Stores the vertical index of a stack so that the same
  1888. * vertical slide can be selected when navigating to and
  1889. * from the stack.
  1890. *
  1891. * @param {HTMLElement} stack The vertical stack element
  1892. * @param {string|number} [v=0] Index to memorize
  1893. */
  1894. function setPreviousVerticalIndex( stack, v ) {
  1895. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1896. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1897. }
  1898. }
  1899. /**
  1900. * Retrieves the vertical index which was stored using
  1901. * #setPreviousVerticalIndex() or 0 if no previous index
  1902. * exists.
  1903. *
  1904. * @param {HTMLElement} stack The vertical stack element
  1905. */
  1906. function getPreviousVerticalIndex( stack ) {
  1907. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1908. // Prefer manually defined start-indexv
  1909. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1910. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1911. }
  1912. return 0;
  1913. }
  1914. /**
  1915. * Displays the overview of slides (quick nav) by scaling
  1916. * down and arranging all slide elements.
  1917. */
  1918. function activateOverview() {
  1919. // Only proceed if enabled in config
  1920. if( config.overview && !isOverview() ) {
  1921. overview = true;
  1922. dom.wrapper.classList.add( 'overview' );
  1923. dom.wrapper.classList.remove( 'overview-deactivating' );
  1924. if( features.overviewTransitions ) {
  1925. setTimeout( function() {
  1926. dom.wrapper.classList.add( 'overview-animated' );
  1927. }, 1 );
  1928. }
  1929. // Don't auto-slide while in overview mode
  1930. cancelAutoSlide();
  1931. // Move the backgrounds element into the slide container to
  1932. // that the same scaling is applied
  1933. dom.slides.appendChild( dom.background );
  1934. // Clicking on an overview slide navigates to it
  1935. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1936. if( !slide.classList.contains( 'stack' ) ) {
  1937. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1938. }
  1939. } );
  1940. // Calculate slide sizes
  1941. var margin = 70;
  1942. var slideSize = getComputedSlideSize();
  1943. overviewSlideWidth = slideSize.width + margin;
  1944. overviewSlideHeight = slideSize.height + margin;
  1945. // Reverse in RTL mode
  1946. if( config.rtl ) {
  1947. overviewSlideWidth = -overviewSlideWidth;
  1948. }
  1949. updateSlidesVisibility();
  1950. layoutOverview();
  1951. updateOverview();
  1952. layout();
  1953. // Notify observers of the overview showing
  1954. dispatchEvent( 'overviewshown', {
  1955. 'indexh': indexh,
  1956. 'indexv': indexv,
  1957. 'currentSlide': currentSlide
  1958. } );
  1959. }
  1960. }
  1961. /**
  1962. * Uses CSS transforms to position all slides in a grid for
  1963. * display inside of the overview mode.
  1964. */
  1965. function layoutOverview() {
  1966. // Layout slides
  1967. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1968. hslide.setAttribute( 'data-index-h', h );
  1969. transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1970. if( hslide.classList.contains( 'stack' ) ) {
  1971. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1972. vslide.setAttribute( 'data-index-h', h );
  1973. vslide.setAttribute( 'data-index-v', v );
  1974. transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1975. } );
  1976. }
  1977. } );
  1978. // Layout slide backgrounds
  1979. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1980. transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1981. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1982. transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1983. } );
  1984. } );
  1985. }
  1986. /**
  1987. * Moves the overview viewport to the current slides.
  1988. * Called each time the current slide changes.
  1989. */
  1990. function updateOverview() {
  1991. var vmin = Math.min( window.innerWidth, window.innerHeight );
  1992. var scale = Math.max( vmin / 5, 150 ) / vmin;
  1993. transformSlides( {
  1994. overview: [
  1995. 'scale('+ scale +')',
  1996. 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
  1997. 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)'
  1998. ].join( ' ' )
  1999. } );
  2000. }
  2001. /**
  2002. * Exits the slide overview and enters the currently
  2003. * active slide.
  2004. */
  2005. function deactivateOverview() {
  2006. // Only proceed if enabled in config
  2007. if( config.overview ) {
  2008. overview = false;
  2009. dom.wrapper.classList.remove( 'overview' );
  2010. dom.wrapper.classList.remove( 'overview-animated' );
  2011. // Temporarily add a class so that transitions can do different things
  2012. // depending on whether they are exiting/entering overview, or just
  2013. // moving from slide to slide
  2014. dom.wrapper.classList.add( 'overview-deactivating' );
  2015. setTimeout( function () {
  2016. dom.wrapper.classList.remove( 'overview-deactivating' );
  2017. }, 1 );
  2018. // Move the background element back out
  2019. dom.wrapper.appendChild( dom.background );
  2020. // Clean up changes made to slides
  2021. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  2022. transformElement( slide, '' );
  2023. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  2024. } );
  2025. // Clean up changes made to backgrounds
  2026. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  2027. transformElement( background, '' );
  2028. } );
  2029. transformSlides( { overview: '' } );
  2030. slide( indexh, indexv );
  2031. layout();
  2032. cueAutoSlide();
  2033. // Notify observers of the overview hiding
  2034. dispatchEvent( 'overviewhidden', {
  2035. 'indexh': indexh,
  2036. 'indexv': indexv,
  2037. 'currentSlide': currentSlide
  2038. } );
  2039. }
  2040. }
  2041. /**
  2042. * Toggles the slide overview mode on and off.
  2043. *
  2044. * @param {Boolean} [override] Flag which overrides the
  2045. * toggle logic and forcibly sets the desired state. True means
  2046. * overview is open, false means it's closed.
  2047. */
  2048. function toggleOverview( override ) {
  2049. if( typeof override === 'boolean' ) {
  2050. override ? activateOverview() : deactivateOverview();
  2051. }
  2052. else {
  2053. isOverview() ? deactivateOverview() : activateOverview();
  2054. }
  2055. }
  2056. /**
  2057. * Checks if the overview is currently active.
  2058. *
  2059. * @return {Boolean} true if the overview is active,
  2060. * false otherwise
  2061. */
  2062. function isOverview() {
  2063. return overview;
  2064. }
  2065. /**
  2066. * Return a hash URL that will resolve to the given slide location.
  2067. *
  2068. * @param {HTMLElement} [slide=currentSlide] The slide to link to
  2069. */
  2070. function locationHash( slide ) {
  2071. var url = '/';
  2072. // Attempt to create a named link based on the slide's ID
  2073. var s = slide || currentSlide;
  2074. var id = s ? s.getAttribute( 'id' ) : null;
  2075. if( id ) {
  2076. id = encodeURIComponent( id );
  2077. }
  2078. var index = getIndices( slide );
  2079. if( !config.fragmentInURL ) {
  2080. index.f = undefined;
  2081. }
  2082. // If the current slide has an ID, use that as a named link,
  2083. // but we don't support named links with a fragment index
  2084. if( typeof id === 'string' && id.length && index.f === undefined ) {
  2085. url = '/' + id;
  2086. }
  2087. // Otherwise use the /h/v index
  2088. else {
  2089. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  2090. if( index.h > 0 || index.v > 0 || index.f !== undefined ) url += index.h + hashIndexBase;
  2091. if( index.v > 0 || index.f !== undefined ) url += '/' + (index.v + hashIndexBase );
  2092. if( index.f !== undefined ) url += '/' + index.f;
  2093. }
  2094. return url;
  2095. }
  2096. /**
  2097. * Checks if the current or specified slide is vertical
  2098. * (nested within another slide).
  2099. *
  2100. * @param {HTMLElement} [slide=currentSlide] The slide to check
  2101. * orientation of
  2102. * @return {Boolean}
  2103. */
  2104. function isVerticalSlide( slide ) {
  2105. // Prefer slide argument, otherwise use current slide
  2106. slide = slide ? slide : currentSlide;
  2107. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  2108. }
  2109. /**
  2110. * Handling the fullscreen functionality via the fullscreen API
  2111. *
  2112. * @see http://fullscreen.spec.whatwg.org/
  2113. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  2114. */
  2115. function enterFullscreen() {
  2116. var element = document.documentElement;
  2117. // Check which implementation is available
  2118. var requestMethod = element.requestFullscreen ||
  2119. element.webkitRequestFullscreen ||
  2120. element.webkitRequestFullScreen ||
  2121. element.mozRequestFullScreen ||
  2122. element.msRequestFullscreen;
  2123. if( requestMethod ) {
  2124. requestMethod.apply( element );
  2125. }
  2126. }
  2127. /**
  2128. * Shows the mouse pointer after it has been hidden with
  2129. * #hideCursor.
  2130. */
  2131. function showCursor() {
  2132. if( cursorHidden ) {
  2133. cursorHidden = false;
  2134. dom.wrapper.style.cursor = '';
  2135. }
  2136. }
  2137. /**
  2138. * Hides the mouse pointer when it's on top of the .reveal
  2139. * container.
  2140. */
  2141. function hideCursor() {
  2142. if( cursorHidden === false ) {
  2143. cursorHidden = true;
  2144. dom.wrapper.style.cursor = 'none';
  2145. }
  2146. }
  2147. /**
  2148. * Enters the paused mode which fades everything on screen to
  2149. * black.
  2150. */
  2151. function pause() {
  2152. if( config.pause ) {
  2153. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2154. cancelAutoSlide();
  2155. dom.wrapper.classList.add( 'paused' );
  2156. if( wasPaused === false ) {
  2157. dispatchEvent( 'paused' );
  2158. }
  2159. }
  2160. }
  2161. /**
  2162. * Exits from the paused mode.
  2163. */
  2164. function resume() {
  2165. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2166. dom.wrapper.classList.remove( 'paused' );
  2167. cueAutoSlide();
  2168. if( wasPaused ) {
  2169. dispatchEvent( 'resumed' );
  2170. }
  2171. }
  2172. /**
  2173. * Toggles the paused mode on and off.
  2174. */
  2175. function togglePause( override ) {
  2176. if( typeof override === 'boolean' ) {
  2177. override ? pause() : resume();
  2178. }
  2179. else {
  2180. isPaused() ? resume() : pause();
  2181. }
  2182. }
  2183. /**
  2184. * Checks if we are currently in the paused mode.
  2185. *
  2186. * @return {Boolean}
  2187. */
  2188. function isPaused() {
  2189. return dom.wrapper.classList.contains( 'paused' );
  2190. }
  2191. /**
  2192. * Toggles the auto slide mode on and off.
  2193. *
  2194. * @param {Boolean} [override] Flag which sets the desired state.
  2195. * True means autoplay starts, false means it stops.
  2196. */
  2197. function toggleAutoSlide( override ) {
  2198. if( typeof override === 'boolean' ) {
  2199. override ? resumeAutoSlide() : pauseAutoSlide();
  2200. }
  2201. else {
  2202. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  2203. }
  2204. }
  2205. /**
  2206. * Checks if the auto slide mode is currently on.
  2207. *
  2208. * @return {Boolean}
  2209. */
  2210. function isAutoSliding() {
  2211. return !!( autoSlide && !autoSlidePaused );
  2212. }
  2213. /**
  2214. * Steps from the current point in the presentation to the
  2215. * slide which matches the specified horizontal and vertical
  2216. * indices.
  2217. *
  2218. * @param {number} [h=indexh] Horizontal index of the target slide
  2219. * @param {number} [v=indexv] Vertical index of the target slide
  2220. * @param {number} [f] Index of a fragment within the
  2221. * target slide to activate
  2222. * @param {number} [o] Origin for use in multimaster environments
  2223. */
  2224. function slide( h, v, f, o ) {
  2225. // Remember where we were at before
  2226. previousSlide = currentSlide;
  2227. // Query all horizontal slides in the deck
  2228. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  2229. // Abort if there are no slides
  2230. if( horizontalSlides.length === 0 ) return;
  2231. // If no vertical index is specified and the upcoming slide is a
  2232. // stack, resume at its previous vertical index
  2233. if( v === undefined && !isOverview() ) {
  2234. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  2235. }
  2236. // If we were on a vertical stack, remember what vertical index
  2237. // it was on so we can resume at the same position when returning
  2238. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  2239. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  2240. }
  2241. // Remember the state before this slide
  2242. var stateBefore = state.concat();
  2243. // Reset the state array
  2244. state.length = 0;
  2245. var indexhBefore = indexh || 0,
  2246. indexvBefore = indexv || 0;
  2247. // Activate and transition to the new slide
  2248. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  2249. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  2250. // Update the visibility of slides now that the indices have changed
  2251. updateSlidesVisibility();
  2252. layout();
  2253. // Update the overview if it's currently active
  2254. if( isOverview() ) {
  2255. updateOverview();
  2256. }
  2257. // Find the current horizontal slide and any possible vertical slides
  2258. // within it
  2259. var currentHorizontalSlide = horizontalSlides[ indexh ],
  2260. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  2261. // Store references to the previous and current slides
  2262. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  2263. // Show fragment, if specified
  2264. if( typeof f !== 'undefined' ) {
  2265. navigateFragment( f );
  2266. }
  2267. // Dispatch an event if the slide changed
  2268. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  2269. if (!slideChanged) {
  2270. // Ensure that the previous slide is never the same as the current
  2271. previousSlide = null;
  2272. }
  2273. // Solves an edge case where the previous slide maintains the
  2274. // 'present' class when navigating between adjacent vertical
  2275. // stacks
  2276. if( previousSlide && previousSlide !== currentSlide ) {
  2277. previousSlide.classList.remove( 'present' );
  2278. previousSlide.setAttribute( 'aria-hidden', 'true' );
  2279. // Reset all slides upon navigate to home
  2280. // Issue: #285
  2281. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  2282. // Launch async task
  2283. setTimeout( function () {
  2284. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  2285. for( i in slides ) {
  2286. if( slides[i] ) {
  2287. // Reset stack
  2288. setPreviousVerticalIndex( slides[i], 0 );
  2289. }
  2290. }
  2291. }, 0 );
  2292. }
  2293. }
  2294. // Apply the new state
  2295. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  2296. // Check if this state existed on the previous slide. If it
  2297. // did, we will avoid adding it repeatedly
  2298. for( var j = 0; j < stateBefore.length; j++ ) {
  2299. if( stateBefore[j] === state[i] ) {
  2300. stateBefore.splice( j, 1 );
  2301. continue stateLoop;
  2302. }
  2303. }
  2304. document.documentElement.classList.add( state[i] );
  2305. // Dispatch custom event matching the state's name
  2306. dispatchEvent( state[i] );
  2307. }
  2308. // Clean up the remains of the previous state
  2309. while( stateBefore.length ) {
  2310. document.documentElement.classList.remove( stateBefore.pop() );
  2311. }
  2312. if( slideChanged ) {
  2313. dispatchEvent( 'slidechanged', {
  2314. 'indexh': indexh,
  2315. 'indexv': indexv,
  2316. 'previousSlide': previousSlide,
  2317. 'currentSlide': currentSlide,
  2318. 'origin': o
  2319. } );
  2320. }
  2321. // Handle embedded content
  2322. if( slideChanged || !previousSlide ) {
  2323. stopEmbeddedContent( previousSlide );
  2324. startEmbeddedContent( currentSlide );
  2325. }
  2326. // Announce the current slide contents, for screen readers
  2327. dom.statusDiv.textContent = getStatusText( currentSlide );
  2328. updateControls();
  2329. updateProgress();
  2330. updateBackground();
  2331. updateParallax();
  2332. updateSlideNumber();
  2333. updateNotes();
  2334. updateFragments();
  2335. // Update the URL hash
  2336. writeURL();
  2337. cueAutoSlide();
  2338. }
  2339. /**
  2340. * Syncs the presentation with the current DOM. Useful
  2341. * when new slides or control elements are added or when
  2342. * the configuration has changed.
  2343. */
  2344. function sync() {
  2345. // Subscribe to input
  2346. removeEventListeners();
  2347. addEventListeners();
  2348. // Force a layout to make sure the current config is accounted for
  2349. layout();
  2350. // Reflect the current autoSlide value
  2351. autoSlide = config.autoSlide;
  2352. // Start auto-sliding if it's enabled
  2353. cueAutoSlide();
  2354. // Re-create the slide backgrounds
  2355. createBackgrounds();
  2356. // Write the current hash to the URL
  2357. writeURL();
  2358. sortAllFragments();
  2359. updateControls();
  2360. updateProgress();
  2361. updateSlideNumber();
  2362. updateSlidesVisibility();
  2363. updateBackground( true );
  2364. updateNotesVisibility();
  2365. updateNotes();
  2366. formatEmbeddedContent();
  2367. // Start or stop embedded content depending on global config
  2368. if( config.autoPlayMedia === false ) {
  2369. stopEmbeddedContent( currentSlide, { unloadIframes: false } );
  2370. }
  2371. else {
  2372. startEmbeddedContent( currentSlide );
  2373. }
  2374. if( isOverview() ) {
  2375. layoutOverview();
  2376. }
  2377. }
  2378. /**
  2379. * Updates reveal.js to keep in sync with new slide attributes. For
  2380. * example, if you add a new `data-background-image` you can call
  2381. * this to have reveal.js render the new background image.
  2382. *
  2383. * Similar to #sync() but more efficient when you only need to
  2384. * refresh a specific slide.
  2385. *
  2386. * @param {HTMLElement} slide
  2387. */
  2388. function syncSlide( slide ) {
  2389. // Default to the current slide
  2390. slide = slide || currentSlide;
  2391. syncBackground( slide );
  2392. syncFragments( slide );
  2393. loadSlide( slide );
  2394. updateBackground();
  2395. updateNotes();
  2396. }
  2397. /**
  2398. * Formats the fragments on the given slide so that they have
  2399. * valid indices. Call this if fragments are changed in the DOM
  2400. * after reveal.js has already initialized.
  2401. *
  2402. * @param {HTMLElement} slide
  2403. * @return {Array} a list of the HTML fragments that were synced
  2404. */
  2405. function syncFragments( slide ) {
  2406. // Default to the current slide
  2407. slide = slide || currentSlide;
  2408. return sortFragments( slide.querySelectorAll( '.fragment' ) );
  2409. }
  2410. /**
  2411. * Resets all vertical slides so that only the first
  2412. * is visible.
  2413. */
  2414. function resetVerticalSlides() {
  2415. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2416. horizontalSlides.forEach( function( horizontalSlide ) {
  2417. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2418. verticalSlides.forEach( function( verticalSlide, y ) {
  2419. if( y > 0 ) {
  2420. verticalSlide.classList.remove( 'present' );
  2421. verticalSlide.classList.remove( 'past' );
  2422. verticalSlide.classList.add( 'future' );
  2423. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  2424. }
  2425. } );
  2426. } );
  2427. }
  2428. /**
  2429. * Sorts and formats all of fragments in the
  2430. * presentation.
  2431. */
  2432. function sortAllFragments() {
  2433. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2434. horizontalSlides.forEach( function( horizontalSlide ) {
  2435. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2436. verticalSlides.forEach( function( verticalSlide, y ) {
  2437. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  2438. } );
  2439. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  2440. } );
  2441. }
  2442. /**
  2443. * Randomly shuffles all slides in the deck.
  2444. */
  2445. function shuffle() {
  2446. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2447. slides.forEach( function( slide ) {
  2448. // Insert this slide next to another random slide. This may
  2449. // cause the slide to insert before itself but that's fine.
  2450. dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
  2451. } );
  2452. }
  2453. /**
  2454. * Updates one dimension of slides by showing the slide
  2455. * with the specified index.
  2456. *
  2457. * @param {string} selector A CSS selector that will fetch
  2458. * the group of slides we are working with
  2459. * @param {number} index The index of the slide that should be
  2460. * shown
  2461. *
  2462. * @return {number} The index of the slide that is now shown,
  2463. * might differ from the passed in index if it was out of
  2464. * bounds.
  2465. */
  2466. function updateSlides( selector, index ) {
  2467. // Select all slides and convert the NodeList result to
  2468. // an array
  2469. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  2470. slidesLength = slides.length;
  2471. var printMode = isPrintingPDF();
  2472. if( slidesLength ) {
  2473. // Should the index loop?
  2474. if( config.loop ) {
  2475. index %= slidesLength;
  2476. if( index < 0 ) {
  2477. index = slidesLength + index;
  2478. }
  2479. }
  2480. // Enforce max and minimum index bounds
  2481. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  2482. for( var i = 0; i < slidesLength; i++ ) {
  2483. var element = slides[i];
  2484. var reverse = config.rtl && !isVerticalSlide( element );
  2485. element.classList.remove( 'past' );
  2486. element.classList.remove( 'present' );
  2487. element.classList.remove( 'future' );
  2488. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  2489. element.setAttribute( 'hidden', '' );
  2490. element.setAttribute( 'aria-hidden', 'true' );
  2491. // If this element contains vertical slides
  2492. if( element.querySelector( 'section' ) ) {
  2493. element.classList.add( 'stack' );
  2494. }
  2495. // If we're printing static slides, all slides are "present"
  2496. if( printMode ) {
  2497. element.classList.add( 'present' );
  2498. continue;
  2499. }
  2500. if( i < index ) {
  2501. // Any element previous to index is given the 'past' class
  2502. element.classList.add( reverse ? 'future' : 'past' );
  2503. if( config.fragments ) {
  2504. // Show all fragments in prior slides
  2505. toArray( element.querySelectorAll( '.fragment' ) ).forEach( function( fragment ) {
  2506. fragment.classList.add( 'visible' );
  2507. fragment.classList.remove( 'current-fragment' );
  2508. } );
  2509. }
  2510. }
  2511. else if( i > index ) {
  2512. // Any element subsequent to index is given the 'future' class
  2513. element.classList.add( reverse ? 'past' : 'future' );
  2514. if( config.fragments ) {
  2515. // Hide all fragments in future slides
  2516. toArray( element.querySelectorAll( '.fragment.visible' ) ).forEach( function( fragment ) {
  2517. fragment.classList.remove( 'visible' );
  2518. fragment.classList.remove( 'current-fragment' );
  2519. } );
  2520. }
  2521. }
  2522. }
  2523. // Mark the current slide as present
  2524. slides[index].classList.add( 'present' );
  2525. slides[index].removeAttribute( 'hidden' );
  2526. slides[index].removeAttribute( 'aria-hidden' );
  2527. // If this slide has a state associated with it, add it
  2528. // onto the current state of the deck
  2529. var slideState = slides[index].getAttribute( 'data-state' );
  2530. if( slideState ) {
  2531. state = state.concat( slideState.split( ' ' ) );
  2532. }
  2533. }
  2534. else {
  2535. // Since there are no slides we can't be anywhere beyond the
  2536. // zeroth index
  2537. index = 0;
  2538. }
  2539. return index;
  2540. }
  2541. /**
  2542. * Optimization method; hide all slides that are far away
  2543. * from the present slide.
  2544. */
  2545. function updateSlidesVisibility() {
  2546. // Select all slides and convert the NodeList result to
  2547. // an array
  2548. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  2549. horizontalSlidesLength = horizontalSlides.length,
  2550. distanceX,
  2551. distanceY;
  2552. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  2553. // The number of steps away from the present slide that will
  2554. // be visible
  2555. var viewDistance = isOverview() ? 10 : config.viewDistance;
  2556. // Shorten the view distance on devices that typically have
  2557. // less resources
  2558. if( isMobileDevice ) {
  2559. viewDistance = isOverview() ? 6 : config.mobileViewDistance;
  2560. }
  2561. // All slides need to be visible when exporting to PDF
  2562. if( isPrintingPDF() ) {
  2563. viewDistance = Number.MAX_VALUE;
  2564. }
  2565. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  2566. var horizontalSlide = horizontalSlides[x];
  2567. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  2568. verticalSlidesLength = verticalSlides.length;
  2569. // Determine how far away this slide is from the present
  2570. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  2571. // If the presentation is looped, distance should measure
  2572. // 1 between the first and last slides
  2573. if( config.loop ) {
  2574. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  2575. }
  2576. // Show the horizontal slide if it's within the view distance
  2577. if( distanceX < viewDistance ) {
  2578. loadSlide( horizontalSlide );
  2579. }
  2580. else {
  2581. unloadSlide( horizontalSlide );
  2582. }
  2583. if( verticalSlidesLength ) {
  2584. var oy = getPreviousVerticalIndex( horizontalSlide );
  2585. for( var y = 0; y < verticalSlidesLength; y++ ) {
  2586. var verticalSlide = verticalSlides[y];
  2587. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  2588. if( distanceX + distanceY < viewDistance ) {
  2589. loadSlide( verticalSlide );
  2590. }
  2591. else {
  2592. unloadSlide( verticalSlide );
  2593. }
  2594. }
  2595. }
  2596. }
  2597. // Flag if there are ANY vertical slides, anywhere in the deck
  2598. if( hasVerticalSlides() ) {
  2599. dom.wrapper.classList.add( 'has-vertical-slides' );
  2600. }
  2601. else {
  2602. dom.wrapper.classList.remove( 'has-vertical-slides' );
  2603. }
  2604. // Flag if there are ANY horizontal slides, anywhere in the deck
  2605. if( hasHorizontalSlides() ) {
  2606. dom.wrapper.classList.add( 'has-horizontal-slides' );
  2607. }
  2608. else {
  2609. dom.wrapper.classList.remove( 'has-horizontal-slides' );
  2610. }
  2611. }
  2612. }
  2613. /**
  2614. * Pick up notes from the current slide and display them
  2615. * to the viewer.
  2616. *
  2617. * @see {@link config.showNotes}
  2618. */
  2619. function updateNotes() {
  2620. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  2621. dom.speakerNotes.innerHTML = getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
  2622. }
  2623. }
  2624. /**
  2625. * Updates the visibility of the speaker notes sidebar that
  2626. * is used to share annotated slides. The notes sidebar is
  2627. * only visible if showNotes is true and there are notes on
  2628. * one or more slides in the deck.
  2629. */
  2630. function updateNotesVisibility() {
  2631. if( config.showNotes && hasNotes() ) {
  2632. dom.wrapper.classList.add( 'show-notes' );
  2633. }
  2634. else {
  2635. dom.wrapper.classList.remove( 'show-notes' );
  2636. }
  2637. }
  2638. /**
  2639. * Checks if there are speaker notes for ANY slide in the
  2640. * presentation.
  2641. */
  2642. function hasNotes() {
  2643. return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0;
  2644. }
  2645. /**
  2646. * Updates the progress bar to reflect the current slide.
  2647. */
  2648. function updateProgress() {
  2649. // Update progress if enabled
  2650. if( config.progress && dom.progressbar ) {
  2651. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  2652. }
  2653. }
  2654. /**
  2655. * Updates the slide number to match the current slide.
  2656. */
  2657. function updateSlideNumber() {
  2658. // Update slide number if enabled
  2659. if( config.slideNumber && dom.slideNumber ) {
  2660. dom.slideNumber.innerHTML = getSlideNumber();
  2661. }
  2662. }
  2663. /**
  2664. * Returns the HTML string corresponding to the current slide number,
  2665. * including formatting.
  2666. */
  2667. function getSlideNumber( slide ) {
  2668. var value;
  2669. var format = 'h.v';
  2670. if( slide === undefined ) {
  2671. slide = currentSlide;
  2672. }
  2673. if ( typeof config.slideNumber === 'function' ) {
  2674. value = config.slideNumber( slide );
  2675. } else {
  2676. // Check if a custom number format is available
  2677. if( typeof config.slideNumber === 'string' ) {
  2678. format = config.slideNumber;
  2679. }
  2680. // If there are ONLY vertical slides in this deck, always use
  2681. // a flattened slide number
  2682. if( !/c/.test( format ) && dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length === 1 ) {
  2683. format = 'c';
  2684. }
  2685. value = [];
  2686. switch( format ) {
  2687. case 'c':
  2688. value.push( getSlidePastCount( slide ) + 1 );
  2689. break;
  2690. case 'c/t':
  2691. value.push( getSlidePastCount( slide ) + 1, '/', getTotalSlides() );
  2692. break;
  2693. default:
  2694. var indices = getIndices( slide );
  2695. value.push( indices.h + 1 );
  2696. var sep = format === 'h/v' ? '/' : '.';
  2697. if( isVerticalSlide( slide ) ) value.push( sep, indices.v + 1 );
  2698. }
  2699. }
  2700. var url = '#' + locationHash( slide );
  2701. return formatSlideNumber( value[0], value[1], value[2], url );
  2702. }
  2703. /**
  2704. * Applies HTML formatting to a slide number before it's
  2705. * written to the DOM.
  2706. *
  2707. * @param {number} a Current slide
  2708. * @param {string} delimiter Character to separate slide numbers
  2709. * @param {(number|*)} b Total slides
  2710. * @param {HTMLElement} [url='#'+locationHash()] The url to link to
  2711. * @return {string} HTML string fragment
  2712. */
  2713. function formatSlideNumber( a, delimiter, b, url ) {
  2714. if( url === undefined ) {
  2715. url = '#' + locationHash();
  2716. }
  2717. if( typeof b === 'number' && !isNaN( b ) ) {
  2718. return '<a href="' + url + '">' +
  2719. '<span class="slide-number-a">'+ a +'</span>' +
  2720. '<span class="slide-number-delimiter">'+ delimiter +'</span>' +
  2721. '<span class="slide-number-b">'+ b +'</span>' +
  2722. '</a>';
  2723. }
  2724. else {
  2725. return '<a href="' + url + '">' +
  2726. '<span class="slide-number-a">'+ a +'</span>' +
  2727. '</a>';
  2728. }
  2729. }
  2730. /**
  2731. * Updates the state of all control/navigation arrows.
  2732. */
  2733. function updateControls() {
  2734. var routes = availableRoutes();
  2735. var fragments = availableFragments();
  2736. // Remove the 'enabled' class from all directions
  2737. dom.controlsLeft.concat( dom.controlsRight )
  2738. .concat( dom.controlsUp )
  2739. .concat( dom.controlsDown )
  2740. .concat( dom.controlsPrev )
  2741. .concat( dom.controlsNext ).forEach( function( node ) {
  2742. node.classList.remove( 'enabled' );
  2743. node.classList.remove( 'fragmented' );
  2744. // Set 'disabled' attribute on all directions
  2745. node.setAttribute( 'disabled', 'disabled' );
  2746. } );
  2747. // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
  2748. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2749. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2750. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2751. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2752. // Prev/next buttons
  2753. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2754. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2755. // Highlight fragment directions
  2756. if( currentSlide ) {
  2757. // Always apply fragment decorator to prev/next buttons
  2758. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2759. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2760. // Apply fragment decorators to directional buttons based on
  2761. // what slide axis they are in
  2762. if( isVerticalSlide( currentSlide ) ) {
  2763. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2764. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2765. }
  2766. else {
  2767. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2768. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2769. }
  2770. }
  2771. if( config.controlsTutorial ) {
  2772. // Highlight control arrows with an animation to ensure
  2773. // that the viewer knows how to navigate
  2774. if( !hasNavigatedDown && routes.down ) {
  2775. dom.controlsDownArrow.classList.add( 'highlight' );
  2776. }
  2777. else {
  2778. dom.controlsDownArrow.classList.remove( 'highlight' );
  2779. if( !hasNavigatedRight && routes.right && indexv === 0 ) {
  2780. dom.controlsRightArrow.classList.add( 'highlight' );
  2781. }
  2782. else {
  2783. dom.controlsRightArrow.classList.remove( 'highlight' );
  2784. }
  2785. }
  2786. }
  2787. }
  2788. /**
  2789. * Updates the background elements to reflect the current
  2790. * slide.
  2791. *
  2792. * @param {boolean} includeAll If true, the backgrounds of
  2793. * all vertical slides (not just the present) will be updated.
  2794. */
  2795. function updateBackground( includeAll ) {
  2796. var currentBackground = null;
  2797. // Reverse past/future classes when in RTL mode
  2798. var horizontalPast = config.rtl ? 'future' : 'past',
  2799. horizontalFuture = config.rtl ? 'past' : 'future';
  2800. // Update the classes of all backgrounds to match the
  2801. // states of their slides (past/present/future)
  2802. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2803. backgroundh.classList.remove( 'past' );
  2804. backgroundh.classList.remove( 'present' );
  2805. backgroundh.classList.remove( 'future' );
  2806. if( h < indexh ) {
  2807. backgroundh.classList.add( horizontalPast );
  2808. }
  2809. else if ( h > indexh ) {
  2810. backgroundh.classList.add( horizontalFuture );
  2811. }
  2812. else {
  2813. backgroundh.classList.add( 'present' );
  2814. // Store a reference to the current background element
  2815. currentBackground = backgroundh;
  2816. }
  2817. if( includeAll || h === indexh ) {
  2818. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2819. backgroundv.classList.remove( 'past' );
  2820. backgroundv.classList.remove( 'present' );
  2821. backgroundv.classList.remove( 'future' );
  2822. if( v < indexv ) {
  2823. backgroundv.classList.add( 'past' );
  2824. }
  2825. else if ( v > indexv ) {
  2826. backgroundv.classList.add( 'future' );
  2827. }
  2828. else {
  2829. backgroundv.classList.add( 'present' );
  2830. // Only if this is the present horizontal and vertical slide
  2831. if( h === indexh ) currentBackground = backgroundv;
  2832. }
  2833. } );
  2834. }
  2835. } );
  2836. // Stop content inside of previous backgrounds
  2837. if( previousBackground ) {
  2838. stopEmbeddedContent( previousBackground, { unloadIframes: !shouldPreload( previousBackground ) } );
  2839. }
  2840. // Start content in the current background
  2841. if( currentBackground ) {
  2842. startEmbeddedContent( currentBackground );
  2843. var currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
  2844. if( currentBackgroundContent ) {
  2845. var backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';
  2846. // Restart GIFs (doesn't work in Firefox)
  2847. if( /\.gif/i.test( backgroundImageURL ) ) {
  2848. currentBackgroundContent.style.backgroundImage = '';
  2849. window.getComputedStyle( currentBackgroundContent ).opacity;
  2850. currentBackgroundContent.style.backgroundImage = backgroundImageURL;
  2851. }
  2852. }
  2853. // Don't transition between identical backgrounds. This
  2854. // prevents unwanted flicker.
  2855. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2856. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2857. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2858. dom.background.classList.add( 'no-transition' );
  2859. }
  2860. previousBackground = currentBackground;
  2861. }
  2862. // If there's a background brightness flag for this slide,
  2863. // bubble it to the .reveal container
  2864. if( currentSlide ) {
  2865. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2866. if( currentSlide.classList.contains( classToBubble ) ) {
  2867. dom.wrapper.classList.add( classToBubble );
  2868. }
  2869. else {
  2870. dom.wrapper.classList.remove( classToBubble );
  2871. }
  2872. } );
  2873. }
  2874. // Allow the first background to apply without transition
  2875. setTimeout( function() {
  2876. dom.background.classList.remove( 'no-transition' );
  2877. }, 1 );
  2878. }
  2879. /**
  2880. * Updates the position of the parallax background based
  2881. * on the current slide index.
  2882. */
  2883. function updateParallax() {
  2884. if( config.parallaxBackgroundImage ) {
  2885. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2886. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2887. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2888. backgroundWidth, backgroundHeight;
  2889. if( backgroundSize.length === 1 ) {
  2890. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2891. }
  2892. else {
  2893. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2894. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2895. }
  2896. var slideWidth = dom.background.offsetWidth,
  2897. horizontalSlideCount = horizontalSlides.length,
  2898. horizontalOffsetMultiplier,
  2899. horizontalOffset;
  2900. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2901. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2902. }
  2903. else {
  2904. horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
  2905. }
  2906. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2907. var slideHeight = dom.background.offsetHeight,
  2908. verticalSlideCount = verticalSlides.length,
  2909. verticalOffsetMultiplier,
  2910. verticalOffset;
  2911. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2912. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2913. }
  2914. else {
  2915. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2916. }
  2917. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0;
  2918. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2919. }
  2920. }
  2921. /**
  2922. * Should the given element be preloaded?
  2923. * Decides based on local element attributes and global config.
  2924. *
  2925. * @param {HTMLElement} element
  2926. */
  2927. function shouldPreload( element ) {
  2928. // Prefer an explicit global preload setting
  2929. var preload = config.preloadIframes;
  2930. // If no global setting is available, fall back on the element's
  2931. // own preload setting
  2932. if( typeof preload !== 'boolean' ) {
  2933. preload = element.hasAttribute( 'data-preload' );
  2934. }
  2935. return preload;
  2936. }
  2937. /**
  2938. * Called when the given slide is within the configured view
  2939. * distance. Shows the slide element and loads any content
  2940. * that is set to load lazily (data-src).
  2941. *
  2942. * @param {HTMLElement} slide Slide to show
  2943. */
  2944. function loadSlide( slide, options ) {
  2945. options = options || {};
  2946. // Show the slide element
  2947. slide.style.display = config.display;
  2948. // Media elements with data-src attributes
  2949. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  2950. if( element.tagName !== 'IFRAME' || shouldPreload( element ) ) {
  2951. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2952. element.setAttribute( 'data-lazy-loaded', '' );
  2953. element.removeAttribute( 'data-src' );
  2954. }
  2955. } );
  2956. // Media elements with <source> children
  2957. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2958. var sources = 0;
  2959. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2960. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2961. source.removeAttribute( 'data-src' );
  2962. source.setAttribute( 'data-lazy-loaded', '' );
  2963. sources += 1;
  2964. } );
  2965. // If we rewrote sources for this video/audio element, we need
  2966. // to manually tell it to load from its new origin
  2967. if( sources > 0 ) {
  2968. media.load();
  2969. }
  2970. } );
  2971. // Show the corresponding background element
  2972. var background = slide.slideBackgroundElement;
  2973. if( background ) {
  2974. background.style.display = 'block';
  2975. var backgroundContent = slide.slideBackgroundContentElement;
  2976. var backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2977. // If the background contains media, load it
  2978. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2979. background.setAttribute( 'data-loaded', 'true' );
  2980. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2981. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2982. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2983. backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' );
  2984. // Images
  2985. if( backgroundImage ) {
  2986. backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')';
  2987. }
  2988. // Videos
  2989. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2990. var video = document.createElement( 'video' );
  2991. if( backgroundVideoLoop ) {
  2992. video.setAttribute( 'loop', '' );
  2993. }
  2994. if( backgroundVideoMuted ) {
  2995. video.muted = true;
  2996. }
  2997. // Inline video playback works (at least in Mobile Safari) as
  2998. // long as the video is muted and the `playsinline` attribute is
  2999. // present
  3000. if( isMobileDevice ) {
  3001. video.muted = true;
  3002. video.autoplay = true;
  3003. video.setAttribute( 'playsinline', '' );
  3004. }
  3005. // Support comma separated lists of video sources
  3006. backgroundVideo.split( ',' ).forEach( function( source ) {
  3007. video.innerHTML += '<source src="'+ source +'">';
  3008. } );
  3009. backgroundContent.appendChild( video );
  3010. }
  3011. // Iframes
  3012. else if( backgroundIframe && options.excludeIframes !== true ) {
  3013. var iframe = document.createElement( 'iframe' );
  3014. iframe.setAttribute( 'allowfullscreen', '' );
  3015. iframe.setAttribute( 'mozallowfullscreen', '' );
  3016. iframe.setAttribute( 'webkitallowfullscreen', '' );
  3017. iframe.setAttribute( 'allow', 'autoplay' );
  3018. iframe.setAttribute( 'data-src', backgroundIframe );
  3019. iframe.style.width = '100%';
  3020. iframe.style.height = '100%';
  3021. iframe.style.maxHeight = '100%';
  3022. iframe.style.maxWidth = '100%';
  3023. backgroundContent.appendChild( iframe );
  3024. }
  3025. }
  3026. // Start loading preloadable iframes
  3027. var backgroundIframeElement = backgroundContent.querySelector( 'iframe[data-src]' );
  3028. if( backgroundIframeElement ) {
  3029. // Check if this iframe is eligible to be preloaded
  3030. if( shouldPreload( background ) && !/autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
  3031. if( backgroundIframeElement.getAttribute( 'src' ) !== backgroundIframe ) {
  3032. backgroundIframeElement.setAttribute( 'src', backgroundIframe );
  3033. }
  3034. }
  3035. }
  3036. }
  3037. }
  3038. /**
  3039. * Unloads and hides the given slide. This is called when the
  3040. * slide is moved outside of the configured view distance.
  3041. *
  3042. * @param {HTMLElement} slide
  3043. */
  3044. function unloadSlide( slide ) {
  3045. // Hide the slide element
  3046. slide.style.display = 'none';
  3047. // Hide the corresponding background element
  3048. var background = getSlideBackground( slide );
  3049. if( background ) {
  3050. background.style.display = 'none';
  3051. // Unload any background iframes
  3052. toArray( background.querySelectorAll( 'iframe[src]' ) ).forEach( function( element ) {
  3053. element.removeAttribute( 'src' );
  3054. } );
  3055. }
  3056. // Reset lazy-loaded media elements with src attributes
  3057. toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ) ).forEach( function( element ) {
  3058. element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
  3059. element.removeAttribute( 'src' );
  3060. } );
  3061. // Reset lazy-loaded media elements with <source> children
  3062. toArray( slide.querySelectorAll( 'video[data-lazy-loaded] source[src], audio source[src]' ) ).forEach( function( source ) {
  3063. source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
  3064. source.removeAttribute( 'src' );
  3065. } );
  3066. }
  3067. /**
  3068. * Determine what available routes there are for navigation.
  3069. *
  3070. * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
  3071. */
  3072. function availableRoutes() {
  3073. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  3074. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  3075. var routes = {
  3076. left: indexh > 0,
  3077. right: indexh < horizontalSlides.length - 1,
  3078. up: indexv > 0,
  3079. down: indexv < verticalSlides.length - 1
  3080. };
  3081. // Looped presentations can always be navigated as long as
  3082. // there are slides available
  3083. if( config.loop ) {
  3084. if( horizontalSlides.length > 1 ) {
  3085. routes.left = true;
  3086. routes.right = true;
  3087. }
  3088. if( verticalSlides.length > 1 ) {
  3089. routes.up = true;
  3090. routes.down = true;
  3091. }
  3092. }
  3093. // Reverse horizontal controls for rtl
  3094. if( config.rtl ) {
  3095. var left = routes.left;
  3096. routes.left = routes.right;
  3097. routes.right = left;
  3098. }
  3099. return routes;
  3100. }
  3101. /**
  3102. * Returns an object describing the available fragment
  3103. * directions.
  3104. *
  3105. * @return {{prev: boolean, next: boolean}}
  3106. */
  3107. function availableFragments() {
  3108. if( currentSlide && config.fragments ) {
  3109. var fragments = currentSlide.querySelectorAll( '.fragment' );
  3110. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  3111. return {
  3112. prev: fragments.length - hiddenFragments.length > 0,
  3113. next: !!hiddenFragments.length
  3114. };
  3115. }
  3116. else {
  3117. return { prev: false, next: false };
  3118. }
  3119. }
  3120. /**
  3121. * Enforces origin-specific format rules for embedded media.
  3122. */
  3123. function formatEmbeddedContent() {
  3124. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  3125. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  3126. var src = el.getAttribute( sourceAttribute );
  3127. if( src && src.indexOf( param ) === -1 ) {
  3128. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  3129. }
  3130. });
  3131. };
  3132. // YouTube frames must include "?enablejsapi=1"
  3133. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  3134. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  3135. // Vimeo frames must include "?api=1"
  3136. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  3137. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  3138. }
  3139. /**
  3140. * Start playback of any embedded content inside of
  3141. * the given element.
  3142. *
  3143. * @param {HTMLElement} element
  3144. */
  3145. function startEmbeddedContent( element ) {
  3146. if( element && !isSpeakerNotes() ) {
  3147. // Restart GIFs
  3148. toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  3149. // Setting the same unchanged source like this was confirmed
  3150. // to work in Chrome, FF & Safari
  3151. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  3152. } );
  3153. // HTML5 media elements
  3154. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3155. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3156. return;
  3157. }
  3158. // Prefer an explicit global autoplay setting
  3159. var autoplay = config.autoPlayMedia;
  3160. // If no global setting is available, fall back on the element's
  3161. // own autoplay setting
  3162. if( typeof autoplay !== 'boolean' ) {
  3163. autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
  3164. }
  3165. if( autoplay && typeof el.play === 'function' ) {
  3166. // If the media is ready, start playback
  3167. if( el.readyState > 1 ) {
  3168. startEmbeddedMedia( { target: el } );
  3169. }
  3170. // Mobile devices never fire a loaded event so instead
  3171. // of waiting, we initiate playback
  3172. else if( isMobileDevice ) {
  3173. var promise = el.play();
  3174. // If autoplay does not work, ensure that the controls are visible so
  3175. // that the viewer can start the media on their own
  3176. if( promise && typeof promise.catch === 'function' && el.controls === false ) {
  3177. promise.catch( function() {
  3178. el.controls = true;
  3179. // Once the video does start playing, hide the controls again
  3180. el.addEventListener( 'play', function() {
  3181. el.controls = false;
  3182. } );
  3183. } );
  3184. }
  3185. }
  3186. // If the media isn't loaded, wait before playing
  3187. else {
  3188. el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes
  3189. el.addEventListener( 'loadeddata', startEmbeddedMedia );
  3190. }
  3191. }
  3192. } );
  3193. // Normal iframes
  3194. toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  3195. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3196. return;
  3197. }
  3198. startEmbeddedIframe( { target: el } );
  3199. } );
  3200. // Lazy loading iframes
  3201. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3202. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3203. return;
  3204. }
  3205. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  3206. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  3207. el.addEventListener( 'load', startEmbeddedIframe );
  3208. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  3209. }
  3210. } );
  3211. }
  3212. }
  3213. /**
  3214. * Starts playing an embedded video/audio element after
  3215. * it has finished loading.
  3216. *
  3217. * @param {object} event
  3218. */
  3219. function startEmbeddedMedia( event ) {
  3220. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3221. isVisible = !!closestParent( event.target, '.present' );
  3222. if( isAttachedToDOM && isVisible ) {
  3223. event.target.currentTime = 0;
  3224. event.target.play();
  3225. }
  3226. event.target.removeEventListener( 'loadeddata', startEmbeddedMedia );
  3227. }
  3228. /**
  3229. * "Starts" the content of an embedded iframe using the
  3230. * postMessage API.
  3231. *
  3232. * @param {object} event
  3233. */
  3234. function startEmbeddedIframe( event ) {
  3235. var iframe = event.target;
  3236. if( iframe && iframe.contentWindow ) {
  3237. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3238. isVisible = !!closestParent( event.target, '.present' );
  3239. if( isAttachedToDOM && isVisible ) {
  3240. // Prefer an explicit global autoplay setting
  3241. var autoplay = config.autoPlayMedia;
  3242. // If no global setting is available, fall back on the element's
  3243. // own autoplay setting
  3244. if( typeof autoplay !== 'boolean' ) {
  3245. autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
  3246. }
  3247. // YouTube postMessage API
  3248. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3249. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  3250. }
  3251. // Vimeo postMessage API
  3252. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3253. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  3254. }
  3255. // Generic postMessage API
  3256. else {
  3257. iframe.contentWindow.postMessage( 'slide:start', '*' );
  3258. }
  3259. }
  3260. }
  3261. }
  3262. /**
  3263. * Stop playback of any embedded content inside of
  3264. * the targeted slide.
  3265. *
  3266. * @param {HTMLElement} element
  3267. */
  3268. function stopEmbeddedContent( element, options ) {
  3269. options = extend( {
  3270. // Defaults
  3271. unloadIframes: true
  3272. }, options || {} );
  3273. if( element && element.parentNode ) {
  3274. // HTML5 media elements
  3275. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3276. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  3277. el.setAttribute('data-paused-by-reveal', '');
  3278. el.pause();
  3279. }
  3280. } );
  3281. // Generic postMessage API for non-lazy loaded iframes
  3282. toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  3283. if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
  3284. el.removeEventListener( 'load', startEmbeddedIframe );
  3285. });
  3286. // YouTube postMessage API
  3287. toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  3288. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3289. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  3290. }
  3291. });
  3292. // Vimeo postMessage API
  3293. toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  3294. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3295. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  3296. }
  3297. });
  3298. if( options.unloadIframes === true ) {
  3299. // Unload lazy-loaded iframes
  3300. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3301. // Only removing the src doesn't actually unload the frame
  3302. // in all browsers (Firefox) so we set it to blank first
  3303. el.setAttribute( 'src', 'about:blank' );
  3304. el.removeAttribute( 'src' );
  3305. } );
  3306. }
  3307. }
  3308. }
  3309. /**
  3310. * Returns the number of past slides. This can be used as a global
  3311. * flattened index for slides.
  3312. *
  3313. * @param {HTMLElement} [slide=currentSlide] The slide we're counting before
  3314. *
  3315. * @return {number} Past slide count
  3316. */
  3317. function getSlidePastCount( slide ) {
  3318. if( slide === undefined ) {
  3319. slide = currentSlide;
  3320. }
  3321. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3322. // The number of past slides
  3323. var pastCount = 0;
  3324. // Step through all slides and count the past ones
  3325. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  3326. var horizontalSlide = horizontalSlides[i];
  3327. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  3328. for( var j = 0; j < verticalSlides.length; j++ ) {
  3329. // Stop as soon as we arrive at the present
  3330. if( verticalSlides[j] === slide ) {
  3331. break mainLoop;
  3332. }
  3333. pastCount++;
  3334. }
  3335. // Stop as soon as we arrive at the present
  3336. if( horizontalSlide === slide ) {
  3337. break;
  3338. }
  3339. // Don't count the wrapping section for vertical slides
  3340. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  3341. pastCount++;
  3342. }
  3343. }
  3344. return pastCount;
  3345. }
  3346. /**
  3347. * Returns a value ranging from 0-1 that represents
  3348. * how far into the presentation we have navigated.
  3349. *
  3350. * @return {number}
  3351. */
  3352. function getProgress() {
  3353. // The number of past and total slides
  3354. var totalCount = getTotalSlides();
  3355. var pastCount = getSlidePastCount();
  3356. if( currentSlide ) {
  3357. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  3358. // If there are fragments in the current slide those should be
  3359. // accounted for in the progress.
  3360. if( allFragments.length > 0 ) {
  3361. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  3362. // This value represents how big a portion of the slide progress
  3363. // that is made up by its fragments (0-1)
  3364. var fragmentWeight = 0.9;
  3365. // Add fragment progress to the past slide count
  3366. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  3367. }
  3368. }
  3369. return Math.min( pastCount / ( totalCount - 1 ), 1 );
  3370. }
  3371. /**
  3372. * Checks if this presentation is running inside of the
  3373. * speaker notes window.
  3374. *
  3375. * @return {boolean}
  3376. */
  3377. function isSpeakerNotes() {
  3378. return !!window.location.search.match( /receiver/gi );
  3379. }
  3380. /**
  3381. * Reads the current URL (hash) and navigates accordingly.
  3382. */
  3383. function readURL() {
  3384. var hash = window.location.hash;
  3385. // Attempt to parse the hash as either an index or name
  3386. var bits = hash.slice( 2 ).split( '/' ),
  3387. name = hash.replace( /#|\//gi, '' );
  3388. // If the first bit is not fully numeric and there is a name we
  3389. // can assume that this is a named link
  3390. if( !/^[0-9]*$/.test( bits[0] ) && name.length ) {
  3391. var element;
  3392. // Ensure the named link is a valid HTML ID attribute
  3393. try {
  3394. element = document.getElementById( decodeURIComponent( name ) );
  3395. }
  3396. catch ( error ) { }
  3397. // Ensure that we're not already on a slide with the same name
  3398. var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
  3399. if( element ) {
  3400. // If the slide exists and is not the current slide...
  3401. if ( !isSameNameAsCurrentSlide ) {
  3402. // ...find the position of the named slide and navigate to it
  3403. var indices = Reveal.getIndices(element);
  3404. slide(indices.h, indices.v);
  3405. }
  3406. }
  3407. // If the slide doesn't exist, navigate to the current slide
  3408. else {
  3409. slide( indexh || 0, indexv || 0 );
  3410. }
  3411. }
  3412. else {
  3413. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  3414. // Read the index components of the hash
  3415. var h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,
  3416. v = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,
  3417. f;
  3418. if( config.fragmentInURL ) {
  3419. f = parseInt( bits[2], 10 );
  3420. if( isNaN( f ) ) {
  3421. f = undefined;
  3422. }
  3423. }
  3424. if( h !== indexh || v !== indexv || f !== undefined ) {
  3425. slide( h, v, f );
  3426. }
  3427. }
  3428. }
  3429. /**
  3430. * Updates the page URL (hash) to reflect the current
  3431. * state.
  3432. *
  3433. * @param {number} delay The time in ms to wait before
  3434. * writing the hash
  3435. */
  3436. function writeURL( delay ) {
  3437. // Make sure there's never more than one timeout running
  3438. clearTimeout( writeURLTimeout );
  3439. // If a delay is specified, timeout this call
  3440. if( typeof delay === 'number' ) {
  3441. writeURLTimeout = setTimeout( writeURL, delay );
  3442. }
  3443. else if( currentSlide ) {
  3444. // If we're configured to push to history OR the history
  3445. // API is not avaialble.
  3446. if( config.history || !window.history ) {
  3447. window.location.hash = locationHash();
  3448. }
  3449. // If we're configured to reflect the current slide in the
  3450. // URL without pushing to history.
  3451. else if( config.hash ) {
  3452. window.history.replaceState( null, null, '#' + locationHash() );
  3453. }
  3454. // If history and hash are both disabled, a hash may still
  3455. // be added to the URL by clicking on a href with a hash
  3456. // target. Counter this by always removing the hash.
  3457. else {
  3458. window.history.replaceState( null, null, window.location.pathname + window.location.search );
  3459. }
  3460. }
  3461. }
  3462. /**
  3463. * Retrieves the h/v location and fragment of the current,
  3464. * or specified, slide.
  3465. *
  3466. * @param {HTMLElement} [slide] If specified, the returned
  3467. * index will be for this slide rather than the currently
  3468. * active one
  3469. *
  3470. * @return {{h: number, v: number, f: number}}
  3471. */
  3472. function getIndices( slide ) {
  3473. // By default, return the current indices
  3474. var h = indexh,
  3475. v = indexv,
  3476. f;
  3477. // If a slide is specified, return the indices of that slide
  3478. if( slide ) {
  3479. var isVertical = isVerticalSlide( slide );
  3480. var slideh = isVertical ? slide.parentNode : slide;
  3481. // Select all horizontal slides
  3482. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3483. // Now that we know which the horizontal slide is, get its index
  3484. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  3485. // Assume we're not vertical
  3486. v = undefined;
  3487. // If this is a vertical slide, grab the vertical index
  3488. if( isVertical ) {
  3489. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  3490. }
  3491. }
  3492. if( !slide && currentSlide ) {
  3493. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  3494. if( hasFragments ) {
  3495. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  3496. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  3497. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  3498. }
  3499. else {
  3500. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  3501. }
  3502. }
  3503. }
  3504. return { h: h, v: v, f: f };
  3505. }
  3506. /**
  3507. * Retrieves all slides in this presentation.
  3508. */
  3509. function getSlides() {
  3510. return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ) );
  3511. }
  3512. /**
  3513. * Returns a list of all horizontal slides in the deck. Each
  3514. * vertical stack is included as one horizontal slide in the
  3515. * resulting array.
  3516. */
  3517. function getHorizontalSlides() {
  3518. return toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3519. }
  3520. /**
  3521. * Returns all vertical slides that exist within this deck.
  3522. */
  3523. function getVerticalSlides() {
  3524. return toArray( dom.wrapper.querySelectorAll( '.slides>section>section' ) );
  3525. }
  3526. /**
  3527. * Returns true if there are at least two horizontal slides.
  3528. */
  3529. function hasHorizontalSlides() {
  3530. return getHorizontalSlides().length > 1;
  3531. }
  3532. /**
  3533. * Returns true if there are at least two vertical slides.
  3534. */
  3535. function hasVerticalSlides() {
  3536. return getVerticalSlides().length > 1;
  3537. }
  3538. /**
  3539. * Returns an array of objects where each object represents the
  3540. * attributes on its respective slide.
  3541. */
  3542. function getSlidesAttributes() {
  3543. return getSlides().map( function( slide ) {
  3544. var attributes = {};
  3545. for( var i = 0; i < slide.attributes.length; i++ ) {
  3546. var attribute = slide.attributes[ i ];
  3547. attributes[ attribute.name ] = attribute.value;
  3548. }
  3549. return attributes;
  3550. } );
  3551. }
  3552. /**
  3553. * Retrieves the total number of slides in this presentation.
  3554. *
  3555. * @return {number}
  3556. */
  3557. function getTotalSlides() {
  3558. return getSlides().length;
  3559. }
  3560. /**
  3561. * Returns the slide element matching the specified index.
  3562. *
  3563. * @return {HTMLElement}
  3564. */
  3565. function getSlide( x, y ) {
  3566. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  3567. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  3568. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  3569. return verticalSlides ? verticalSlides[ y ] : undefined;
  3570. }
  3571. return horizontalSlide;
  3572. }
  3573. /**
  3574. * Returns the background element for the given slide.
  3575. * All slides, even the ones with no background properties
  3576. * defined, have a background element so as long as the
  3577. * index is valid an element will be returned.
  3578. *
  3579. * @param {mixed} x Horizontal background index OR a slide
  3580. * HTML element
  3581. * @param {number} y Vertical background index
  3582. * @return {(HTMLElement[]|*)}
  3583. */
  3584. function getSlideBackground( x, y ) {
  3585. var slide = typeof x === 'number' ? getSlide( x, y ) : x;
  3586. if( slide ) {
  3587. return slide.slideBackgroundElement;
  3588. }
  3589. return undefined;
  3590. }
  3591. /**
  3592. * Retrieves the speaker notes from a slide. Notes can be
  3593. * defined in two ways:
  3594. * 1. As a data-notes attribute on the slide <section>
  3595. * 2. As an <aside class="notes"> inside of the slide
  3596. *
  3597. * @param {HTMLElement} [slide=currentSlide]
  3598. * @return {(string|null)}
  3599. */
  3600. function getSlideNotes( slide ) {
  3601. // Default to the current slide
  3602. slide = slide || currentSlide;
  3603. // Notes can be specified via the data-notes attribute...
  3604. if( slide.hasAttribute( 'data-notes' ) ) {
  3605. return slide.getAttribute( 'data-notes' );
  3606. }
  3607. // ... or using an <aside class="notes"> element
  3608. var notesElement = slide.querySelector( 'aside.notes' );
  3609. if( notesElement ) {
  3610. return notesElement.innerHTML;
  3611. }
  3612. return null;
  3613. }
  3614. /**
  3615. * Retrieves the current state of the presentation as
  3616. * an object. This state can then be restored at any
  3617. * time.
  3618. *
  3619. * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
  3620. */
  3621. function getState() {
  3622. var indices = getIndices();
  3623. return {
  3624. indexh: indices.h,
  3625. indexv: indices.v,
  3626. indexf: indices.f,
  3627. paused: isPaused(),
  3628. overview: isOverview()
  3629. };
  3630. }
  3631. /**
  3632. * Restores the presentation to the given state.
  3633. *
  3634. * @param {object} state As generated by getState()
  3635. * @see {@link getState} generates the parameter `state`
  3636. */
  3637. function setState( state ) {
  3638. if( typeof state === 'object' ) {
  3639. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  3640. var pausedFlag = deserialize( state.paused ),
  3641. overviewFlag = deserialize( state.overview );
  3642. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  3643. togglePause( pausedFlag );
  3644. }
  3645. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  3646. toggleOverview( overviewFlag );
  3647. }
  3648. }
  3649. }
  3650. /**
  3651. * Return a sorted fragments list, ordered by an increasing
  3652. * "data-fragment-index" attribute.
  3653. *
  3654. * Fragments will be revealed in the order that they are returned by
  3655. * this function, so you can use the index attributes to control the
  3656. * order of fragment appearance.
  3657. *
  3658. * To maintain a sensible default fragment order, fragments are presumed
  3659. * to be passed in document order. This function adds a "fragment-index"
  3660. * attribute to each node if such an attribute is not already present,
  3661. * and sets that attribute to an integer value which is the position of
  3662. * the fragment within the fragments list.
  3663. *
  3664. * @param {object[]|*} fragments
  3665. * @param {boolean} grouped If true the returned array will contain
  3666. * nested arrays for all fragments with the same index
  3667. * @return {object[]} sorted Sorted array of fragments
  3668. */
  3669. function sortFragments( fragments, grouped ) {
  3670. fragments = toArray( fragments );
  3671. var ordered = [],
  3672. unordered = [],
  3673. sorted = [];
  3674. // Group ordered and unordered elements
  3675. fragments.forEach( function( fragment, i ) {
  3676. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  3677. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  3678. if( !ordered[index] ) {
  3679. ordered[index] = [];
  3680. }
  3681. ordered[index].push( fragment );
  3682. }
  3683. else {
  3684. unordered.push( [ fragment ] );
  3685. }
  3686. } );
  3687. // Append fragments without explicit indices in their
  3688. // DOM order
  3689. ordered = ordered.concat( unordered );
  3690. // Manually count the index up per group to ensure there
  3691. // are no gaps
  3692. var index = 0;
  3693. // Push all fragments in their sorted order to an array,
  3694. // this flattens the groups
  3695. ordered.forEach( function( group ) {
  3696. group.forEach( function( fragment ) {
  3697. sorted.push( fragment );
  3698. fragment.setAttribute( 'data-fragment-index', index );
  3699. } );
  3700. index ++;
  3701. } );
  3702. return grouped === true ? ordered : sorted;
  3703. }
  3704. /**
  3705. * Refreshes the fragments on the current slide so that they
  3706. * have the appropriate classes (.visible + .current-fragment).
  3707. *
  3708. * @param {number} [index] The index of the current fragment
  3709. * @param {array} [fragments] Array containing all fragments
  3710. * in the current slide
  3711. *
  3712. * @return {{shown: array, hidden: array}}
  3713. */
  3714. function updateFragments( index, fragments ) {
  3715. var changedFragments = {
  3716. shown: [],
  3717. hidden: []
  3718. };
  3719. if( currentSlide && config.fragments ) {
  3720. fragments = fragments || sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3721. if( fragments.length ) {
  3722. var maxIndex = 0;
  3723. if( typeof index !== 'number' ) {
  3724. var currentFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3725. if( currentFragment ) {
  3726. index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3727. }
  3728. }
  3729. toArray( fragments ).forEach( function( el, i ) {
  3730. if( el.hasAttribute( 'data-fragment-index' ) ) {
  3731. i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
  3732. }
  3733. maxIndex = Math.max( maxIndex, i );
  3734. // Visible fragments
  3735. if( i <= index ) {
  3736. if( !el.classList.contains( 'visible' ) ) changedFragments.shown.push( el );
  3737. el.classList.add( 'visible' );
  3738. el.classList.remove( 'current-fragment' );
  3739. // Announce the fragments one by one to the Screen Reader
  3740. dom.statusDiv.textContent = getStatusText( el );
  3741. if( i === index ) {
  3742. el.classList.add( 'current-fragment' );
  3743. startEmbeddedContent( el );
  3744. }
  3745. }
  3746. // Hidden fragments
  3747. else {
  3748. if( el.classList.contains( 'visible' ) ) changedFragments.hidden.push( el );
  3749. el.classList.remove( 'visible' );
  3750. el.classList.remove( 'current-fragment' );
  3751. }
  3752. } );
  3753. // Write the current fragment index to the slide <section>.
  3754. // This can be used by end users to apply styles based on
  3755. // the current fragment index.
  3756. index = typeof index === 'number' ? index : -1;
  3757. index = Math.max( Math.min( index, maxIndex ), -1 );
  3758. currentSlide.setAttribute( 'data-fragment', index );
  3759. }
  3760. }
  3761. return changedFragments;
  3762. }
  3763. /**
  3764. * Navigate to the specified slide fragment.
  3765. *
  3766. * @param {?number} index The index of the fragment that
  3767. * should be shown, -1 means all are invisible
  3768. * @param {number} offset Integer offset to apply to the
  3769. * fragment index
  3770. *
  3771. * @return {boolean} true if a change was made in any
  3772. * fragments visibility as part of this call
  3773. */
  3774. function navigateFragment( index, offset ) {
  3775. if( currentSlide && config.fragments ) {
  3776. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3777. if( fragments.length ) {
  3778. // If no index is specified, find the current
  3779. if( typeof index !== 'number' ) {
  3780. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3781. if( lastVisibleFragment ) {
  3782. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3783. }
  3784. else {
  3785. index = -1;
  3786. }
  3787. }
  3788. // If an offset is specified, apply it to the index
  3789. if( typeof offset === 'number' ) {
  3790. index += offset;
  3791. }
  3792. var changedFragments = updateFragments( index, fragments );
  3793. if( changedFragments.hidden.length ) {
  3794. dispatchEvent( 'fragmenthidden', { fragment: changedFragments.hidden[0], fragments: changedFragments.hidden } );
  3795. }
  3796. if( changedFragments.shown.length ) {
  3797. dispatchEvent( 'fragmentshown', { fragment: changedFragments.shown[0], fragments: changedFragments.shown } );
  3798. }
  3799. updateControls();
  3800. updateProgress();
  3801. if( config.fragmentInURL ) {
  3802. writeURL();
  3803. }
  3804. return !!( changedFragments.shown.length || changedFragments.hidden.length );
  3805. }
  3806. }
  3807. return false;
  3808. }
  3809. /**
  3810. * Navigate to the next slide fragment.
  3811. *
  3812. * @return {boolean} true if there was a next fragment,
  3813. * false otherwise
  3814. */
  3815. function nextFragment() {
  3816. return navigateFragment( null, 1 );
  3817. }
  3818. /**
  3819. * Navigate to the previous slide fragment.
  3820. *
  3821. * @return {boolean} true if there was a previous fragment,
  3822. * false otherwise
  3823. */
  3824. function previousFragment() {
  3825. return navigateFragment( null, -1 );
  3826. }
  3827. /**
  3828. * Cues a new automated slide if enabled in the config.
  3829. */
  3830. function cueAutoSlide() {
  3831. cancelAutoSlide();
  3832. if( currentSlide && config.autoSlide !== false ) {
  3833. var fragment = currentSlide.querySelector( '.current-fragment' );
  3834. // When the slide first appears there is no "current" fragment so
  3835. // we look for a data-autoslide timing on the first fragment
  3836. if( !fragment ) fragment = currentSlide.querySelector( '.fragment' );
  3837. var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
  3838. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  3839. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  3840. // Pick value in the following priority order:
  3841. // 1. Current fragment's data-autoslide
  3842. // 2. Current slide's data-autoslide
  3843. // 3. Parent slide's data-autoslide
  3844. // 4. Global autoSlide setting
  3845. if( fragmentAutoSlide ) {
  3846. autoSlide = parseInt( fragmentAutoSlide, 10 );
  3847. }
  3848. else if( slideAutoSlide ) {
  3849. autoSlide = parseInt( slideAutoSlide, 10 );
  3850. }
  3851. else if( parentAutoSlide ) {
  3852. autoSlide = parseInt( parentAutoSlide, 10 );
  3853. }
  3854. else {
  3855. autoSlide = config.autoSlide;
  3856. }
  3857. // If there are media elements with data-autoplay,
  3858. // automatically set the autoSlide duration to the
  3859. // length of that media. Not applicable if the slide
  3860. // is divided up into fragments.
  3861. // playbackRate is accounted for in the duration.
  3862. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  3863. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3864. if( el.hasAttribute( 'data-autoplay' ) ) {
  3865. if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
  3866. autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
  3867. }
  3868. }
  3869. } );
  3870. }
  3871. // Cue the next auto-slide if:
  3872. // - There is an autoSlide value
  3873. // - Auto-sliding isn't paused by the user
  3874. // - The presentation isn't paused
  3875. // - The overview isn't active
  3876. // - The presentation isn't over
  3877. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  3878. autoSlideTimeout = setTimeout( function() {
  3879. typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
  3880. cueAutoSlide();
  3881. }, autoSlide );
  3882. autoSlideStartTime = Date.now();
  3883. }
  3884. if( autoSlidePlayer ) {
  3885. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  3886. }
  3887. }
  3888. }
  3889. /**
  3890. * Cancels any ongoing request to auto-slide.
  3891. */
  3892. function cancelAutoSlide() {
  3893. clearTimeout( autoSlideTimeout );
  3894. autoSlideTimeout = -1;
  3895. }
  3896. function pauseAutoSlide() {
  3897. if( autoSlide && !autoSlidePaused ) {
  3898. autoSlidePaused = true;
  3899. dispatchEvent( 'autoslidepaused' );
  3900. clearTimeout( autoSlideTimeout );
  3901. if( autoSlidePlayer ) {
  3902. autoSlidePlayer.setPlaying( false );
  3903. }
  3904. }
  3905. }
  3906. function resumeAutoSlide() {
  3907. if( autoSlide && autoSlidePaused ) {
  3908. autoSlidePaused = false;
  3909. dispatchEvent( 'autoslideresumed' );
  3910. cueAutoSlide();
  3911. }
  3912. }
  3913. function navigateLeft() {
  3914. // Reverse for RTL
  3915. if( config.rtl ) {
  3916. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  3917. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3918. }
  3919. }
  3920. // Normal navigation
  3921. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  3922. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3923. }
  3924. }
  3925. function navigateRight() {
  3926. hasNavigatedRight = true;
  3927. // Reverse for RTL
  3928. if( config.rtl ) {
  3929. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  3930. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3931. }
  3932. }
  3933. // Normal navigation
  3934. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  3935. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3936. }
  3937. }
  3938. function navigateUp() {
  3939. // Prioritize hiding fragments
  3940. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  3941. slide( indexh, indexv - 1 );
  3942. }
  3943. }
  3944. function navigateDown() {
  3945. hasNavigatedDown = true;
  3946. // Prioritize revealing fragments
  3947. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  3948. slide( indexh, indexv + 1 );
  3949. }
  3950. }
  3951. /**
  3952. * Navigates backwards, prioritized in the following order:
  3953. * 1) Previous fragment
  3954. * 2) Previous vertical slide
  3955. * 3) Previous horizontal slide
  3956. */
  3957. function navigatePrev() {
  3958. // Prioritize revealing fragments
  3959. if( previousFragment() === false ) {
  3960. if( availableRoutes().up ) {
  3961. navigateUp();
  3962. }
  3963. else {
  3964. // Fetch the previous horizontal slide, if there is one
  3965. var previousSlide;
  3966. if( config.rtl ) {
  3967. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  3968. }
  3969. else {
  3970. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  3971. }
  3972. if( previousSlide ) {
  3973. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  3974. var h = indexh - 1;
  3975. slide( h, v );
  3976. }
  3977. }
  3978. }
  3979. }
  3980. /**
  3981. * The reverse of #navigatePrev().
  3982. */
  3983. function navigateNext() {
  3984. hasNavigatedRight = true;
  3985. hasNavigatedDown = true;
  3986. // Prioritize revealing fragments
  3987. if( nextFragment() === false ) {
  3988. var routes = availableRoutes();
  3989. // When looping is enabled `routes.down` is always available
  3990. // so we need a separate check for when we've reached the
  3991. // end of a stack and should move horizontally
  3992. if( routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide( currentSlide ) ) {
  3993. routes.down = false;
  3994. }
  3995. if( routes.down ) {
  3996. navigateDown();
  3997. }
  3998. else if( config.rtl ) {
  3999. navigateLeft();
  4000. }
  4001. else {
  4002. navigateRight();
  4003. }
  4004. }
  4005. }
  4006. /**
  4007. * Checks if the target element prevents the triggering of
  4008. * swipe navigation.
  4009. */
  4010. function isSwipePrevented( target ) {
  4011. while( target && typeof target.hasAttribute === 'function' ) {
  4012. if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
  4013. target = target.parentNode;
  4014. }
  4015. return false;
  4016. }
  4017. // --------------------------------------------------------------------//
  4018. // ----------------------------- EVENTS -------------------------------//
  4019. // --------------------------------------------------------------------//
  4020. /**
  4021. * Called by all event handlers that are based on user
  4022. * input.
  4023. *
  4024. * @param {object} [event]
  4025. */
  4026. function onUserInput( event ) {
  4027. if( config.autoSlideStoppable ) {
  4028. pauseAutoSlide();
  4029. }
  4030. }
  4031. /**
  4032. * Called whenever there is mouse input at the document level
  4033. * to determine if the cursor is active or not.
  4034. *
  4035. * @param {object} event
  4036. */
  4037. function onDocumentCursorActive( event ) {
  4038. showCursor();
  4039. clearTimeout( cursorInactiveTimeout );
  4040. cursorInactiveTimeout = setTimeout( hideCursor, config.hideCursorTime );
  4041. }
  4042. /**
  4043. * Handler for the document level 'keypress' event.
  4044. *
  4045. * @param {object} event
  4046. */
  4047. function onDocumentKeyPress( event ) {
  4048. // Check if the pressed key is question mark
  4049. if( event.shiftKey && event.charCode === 63 ) {
  4050. toggleHelp();
  4051. }
  4052. }
  4053. /**
  4054. * Handler for the document level 'keydown' event.
  4055. *
  4056. * @param {object} event
  4057. */
  4058. function onDocumentKeyDown( event ) {
  4059. // If there's a condition specified and it returns false,
  4060. // ignore this event
  4061. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
  4062. return true;
  4063. }
  4064. // Shorthand
  4065. var keyCode = event.keyCode;
  4066. // Remember if auto-sliding was paused so we can toggle it
  4067. var autoSlideWasPaused = autoSlidePaused;
  4068. onUserInput( event );
  4069. // Is there a focused element that could be using the keyboard?
  4070. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  4071. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  4072. var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
  4073. // Whitelist specific modified + keycode combinations
  4074. var prevSlideShortcut = event.shiftKey && event.keyCode === 32;
  4075. var firstSlideShortcut = event.shiftKey && keyCode === 37;
  4076. var lastSlideShortcut = event.shiftKey && keyCode === 39;
  4077. // Prevent all other events when a modifier is pressed
  4078. var unusedModifier = !prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
  4079. ( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );
  4080. // Disregard the event if there's a focused element or a
  4081. // keyboard modifier key is present
  4082. if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;
  4083. // While paused only allow resume keyboard events; 'b', 'v', '.'
  4084. var resumeKeyCodes = [66,86,190,191];
  4085. var key;
  4086. // Custom key bindings for togglePause should be able to resume
  4087. if( typeof config.keyboard === 'object' ) {
  4088. for( key in config.keyboard ) {
  4089. if( config.keyboard[key] === 'togglePause' ) {
  4090. resumeKeyCodes.push( parseInt( key, 10 ) );
  4091. }
  4092. }
  4093. }
  4094. if( isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
  4095. return false;
  4096. }
  4097. // Use linear navigation if we're configured to OR if
  4098. // the presentation is one-dimensional
  4099. var useLinearMode = config.navigationMode === 'linear' || !hasHorizontalSlides() || !hasVerticalSlides();
  4100. var triggered = false;
  4101. // 1. User defined key bindings
  4102. if( typeof config.keyboard === 'object' ) {
  4103. for( key in config.keyboard ) {
  4104. // Check if this binding matches the pressed key
  4105. if( parseInt( key, 10 ) === keyCode ) {
  4106. var value = config.keyboard[ key ];
  4107. // Callback function
  4108. if( typeof value === 'function' ) {
  4109. value.apply( null, [ event ] );
  4110. }
  4111. // String shortcuts to reveal.js API
  4112. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  4113. Reveal[ value ].call();
  4114. }
  4115. triggered = true;
  4116. }
  4117. }
  4118. }
  4119. // 2. Registered custom key bindings
  4120. if( triggered === false ) {
  4121. for( key in registeredKeyBindings ) {
  4122. // Check if this binding matches the pressed key
  4123. if( parseInt( key, 10 ) === keyCode ) {
  4124. var action = registeredKeyBindings[ key ].callback;
  4125. // Callback function
  4126. if( typeof action === 'function' ) {
  4127. action.apply( null, [ event ] );
  4128. }
  4129. // String shortcuts to reveal.js API
  4130. else if( typeof action === 'string' && typeof Reveal[ action ] === 'function' ) {
  4131. Reveal[ action ].call();
  4132. }
  4133. triggered = true;
  4134. }
  4135. }
  4136. }
  4137. // 3. System defined key bindings
  4138. if( triggered === false ) {
  4139. // Assume true and try to prove false
  4140. triggered = true;
  4141. // P, PAGE UP
  4142. if( keyCode === 80 || keyCode === 33 ) {
  4143. navigatePrev();
  4144. }
  4145. // N, PAGE DOWN
  4146. else if( keyCode === 78 || keyCode === 34 ) {
  4147. navigateNext();
  4148. }
  4149. // H, LEFT
  4150. else if( keyCode === 72 || keyCode === 37 ) {
  4151. if( firstSlideShortcut ) {
  4152. slide( 0 );
  4153. }
  4154. else if( !isOverview() && useLinearMode ) {
  4155. navigatePrev();
  4156. }
  4157. else {
  4158. navigateLeft();
  4159. }
  4160. }
  4161. // L, RIGHT
  4162. else if( keyCode === 76 || keyCode === 39 ) {
  4163. if( lastSlideShortcut ) {
  4164. slide( Number.MAX_VALUE );
  4165. }
  4166. else if( !isOverview() && useLinearMode ) {
  4167. navigateNext();
  4168. }
  4169. else {
  4170. navigateRight();
  4171. }
  4172. }
  4173. // K, UP
  4174. else if( keyCode === 75 || keyCode === 38 ) {
  4175. if( !isOverview() && useLinearMode ) {
  4176. navigatePrev();
  4177. }
  4178. else {
  4179. navigateUp();
  4180. }
  4181. }
  4182. // J, DOWN
  4183. else if( keyCode === 74 || keyCode === 40 ) {
  4184. if( !isOverview() && useLinearMode ) {
  4185. navigateNext();
  4186. }
  4187. else {
  4188. navigateDown();
  4189. }
  4190. }
  4191. // HOME
  4192. else if( keyCode === 36 ) {
  4193. slide( 0 );
  4194. }
  4195. // END
  4196. else if( keyCode === 35 ) {
  4197. slide( Number.MAX_VALUE );
  4198. }
  4199. // SPACE
  4200. else if( keyCode === 32 ) {
  4201. if( isOverview() ) {
  4202. deactivateOverview();
  4203. }
  4204. if( event.shiftKey ) {
  4205. navigatePrev();
  4206. }
  4207. else {
  4208. navigateNext();
  4209. }
  4210. }
  4211. // TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS "BLACK SCREEN" BUTTON
  4212. else if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {
  4213. togglePause();
  4214. }
  4215. // F
  4216. else if( keyCode === 70 ) {
  4217. enterFullscreen();
  4218. }
  4219. // A
  4220. else if( keyCode === 65 ) {
  4221. if ( config.autoSlideStoppable ) {
  4222. toggleAutoSlide( autoSlideWasPaused );
  4223. }
  4224. }
  4225. else {
  4226. triggered = false;
  4227. }
  4228. }
  4229. // If the input resulted in a triggered action we should prevent
  4230. // the browsers default behavior
  4231. if( triggered ) {
  4232. event.preventDefault && event.preventDefault();
  4233. }
  4234. // ESC or O key
  4235. else if ( ( keyCode === 27 || keyCode === 79 ) && features.transforms3d ) {
  4236. if( dom.overlay ) {
  4237. closeOverlay();
  4238. }
  4239. else {
  4240. toggleOverview();
  4241. }
  4242. event.preventDefault && event.preventDefault();
  4243. }
  4244. // If auto-sliding is enabled we need to cue up
  4245. // another timeout
  4246. cueAutoSlide();
  4247. }
  4248. /**
  4249. * Handler for the 'touchstart' event, enables support for
  4250. * swipe and pinch gestures.
  4251. *
  4252. * @param {object} event
  4253. */
  4254. function onTouchStart( event ) {
  4255. if( isSwipePrevented( event.target ) ) return true;
  4256. touch.startX = event.touches[0].clientX;
  4257. touch.startY = event.touches[0].clientY;
  4258. touch.startCount = event.touches.length;
  4259. }
  4260. /**
  4261. * Handler for the 'touchmove' event.
  4262. *
  4263. * @param {object} event
  4264. */
  4265. function onTouchMove( event ) {
  4266. if( isSwipePrevented( event.target ) ) return true;
  4267. // Each touch should only trigger one action
  4268. if( !touch.captured ) {
  4269. onUserInput( event );
  4270. var currentX = event.touches[0].clientX;
  4271. var currentY = event.touches[0].clientY;
  4272. // There was only one touch point, look for a swipe
  4273. if( event.touches.length === 1 && touch.startCount !== 2 ) {
  4274. var deltaX = currentX - touch.startX,
  4275. deltaY = currentY - touch.startY;
  4276. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4277. touch.captured = true;
  4278. if( config.navigationMode === 'linear' ) {
  4279. if( config.rtl ) {
  4280. navigateNext();
  4281. }
  4282. else {
  4283. navigatePrev();
  4284. }
  4285. }
  4286. else {
  4287. navigateLeft();
  4288. }
  4289. }
  4290. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4291. touch.captured = true;
  4292. if( config.navigationMode === 'linear' ) {
  4293. if( config.rtl ) {
  4294. navigatePrev();
  4295. }
  4296. else {
  4297. navigateNext();
  4298. }
  4299. }
  4300. else {
  4301. navigateRight();
  4302. }
  4303. }
  4304. else if( deltaY > touch.threshold ) {
  4305. touch.captured = true;
  4306. if( config.navigationMode === 'linear' ) {
  4307. navigatePrev();
  4308. }
  4309. else {
  4310. navigateUp();
  4311. }
  4312. }
  4313. else if( deltaY < -touch.threshold ) {
  4314. touch.captured = true;
  4315. if( config.navigationMode === 'linear' ) {
  4316. navigateNext();
  4317. }
  4318. else {
  4319. navigateDown();
  4320. }
  4321. }
  4322. // If we're embedded, only block touch events if they have
  4323. // triggered an action
  4324. if( config.embedded ) {
  4325. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  4326. event.preventDefault();
  4327. }
  4328. }
  4329. // Not embedded? Block them all to avoid needless tossing
  4330. // around of the viewport in iOS
  4331. else {
  4332. event.preventDefault();
  4333. }
  4334. }
  4335. }
  4336. // There's a bug with swiping on some Android devices unless
  4337. // the default action is always prevented
  4338. else if( UA.match( /android/gi ) ) {
  4339. event.preventDefault();
  4340. }
  4341. }
  4342. /**
  4343. * Handler for the 'touchend' event.
  4344. *
  4345. * @param {object} event
  4346. */
  4347. function onTouchEnd( event ) {
  4348. touch.captured = false;
  4349. }
  4350. /**
  4351. * Convert pointer down to touch start.
  4352. *
  4353. * @param {object} event
  4354. */
  4355. function onPointerDown( event ) {
  4356. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4357. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4358. onTouchStart( event );
  4359. }
  4360. }
  4361. /**
  4362. * Convert pointer move to touch move.
  4363. *
  4364. * @param {object} event
  4365. */
  4366. function onPointerMove( event ) {
  4367. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4368. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4369. onTouchMove( event );
  4370. }
  4371. }
  4372. /**
  4373. * Convert pointer up to touch end.
  4374. *
  4375. * @param {object} event
  4376. */
  4377. function onPointerUp( event ) {
  4378. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4379. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4380. onTouchEnd( event );
  4381. }
  4382. }
  4383. /**
  4384. * Handles mouse wheel scrolling, throttled to avoid skipping
  4385. * multiple slides.
  4386. *
  4387. * @param {object} event
  4388. */
  4389. function onDocumentMouseScroll( event ) {
  4390. if( Date.now() - lastMouseWheelStep > 600 ) {
  4391. lastMouseWheelStep = Date.now();
  4392. var delta = event.detail || -event.wheelDelta;
  4393. if( delta > 0 ) {
  4394. navigateNext();
  4395. }
  4396. else if( delta < 0 ) {
  4397. navigatePrev();
  4398. }
  4399. }
  4400. }
  4401. /**
  4402. * Clicking on the progress bar results in a navigation to the
  4403. * closest approximate horizontal slide using this equation:
  4404. *
  4405. * ( clickX / presentationWidth ) * numberOfSlides
  4406. *
  4407. * @param {object} event
  4408. */
  4409. function onProgressClicked( event ) {
  4410. onUserInput( event );
  4411. event.preventDefault();
  4412. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  4413. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  4414. if( config.rtl ) {
  4415. slideIndex = slidesTotal - slideIndex;
  4416. }
  4417. slide( slideIndex );
  4418. }
  4419. /**
  4420. * Event handler for navigation control buttons.
  4421. */
  4422. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigatePrev() : navigateLeft(); }
  4423. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigateNext() : navigateRight(); }
  4424. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  4425. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  4426. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  4427. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  4428. /**
  4429. * Handler for the window level 'hashchange' event.
  4430. *
  4431. * @param {object} [event]
  4432. */
  4433. function onWindowHashChange( event ) {
  4434. readURL();
  4435. }
  4436. /**
  4437. * Handler for the window level 'resize' event.
  4438. *
  4439. * @param {object} [event]
  4440. */
  4441. function onWindowResize( event ) {
  4442. layout();
  4443. }
  4444. /**
  4445. * Handle for the window level 'visibilitychange' event.
  4446. *
  4447. * @param {object} [event]
  4448. */
  4449. function onPageVisibilityChange( event ) {
  4450. var isHidden = document.webkitHidden ||
  4451. document.msHidden ||
  4452. document.hidden;
  4453. // If, after clicking a link or similar and we're coming back,
  4454. // focus the document.body to ensure we can use keyboard shortcuts
  4455. if( isHidden === false && document.activeElement !== document.body ) {
  4456. // Not all elements support .blur() - SVGs among them.
  4457. if( typeof document.activeElement.blur === 'function' ) {
  4458. document.activeElement.blur();
  4459. }
  4460. document.body.focus();
  4461. }
  4462. }
  4463. /**
  4464. * Invoked when a slide is and we're in the overview.
  4465. *
  4466. * @param {object} event
  4467. */
  4468. function onOverviewSlideClicked( event ) {
  4469. // TODO There's a bug here where the event listeners are not
  4470. // removed after deactivating the overview.
  4471. if( eventsAreBound && isOverview() ) {
  4472. event.preventDefault();
  4473. var element = event.target;
  4474. while( element && !element.nodeName.match( /section/gi ) ) {
  4475. element = element.parentNode;
  4476. }
  4477. if( element && !element.classList.contains( 'disabled' ) ) {
  4478. deactivateOverview();
  4479. if( element.nodeName.match( /section/gi ) ) {
  4480. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  4481. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  4482. slide( h, v );
  4483. }
  4484. }
  4485. }
  4486. }
  4487. /**
  4488. * Handles clicks on links that are set to preview in the
  4489. * iframe overlay.
  4490. *
  4491. * @param {object} event
  4492. */
  4493. function onPreviewLinkClicked( event ) {
  4494. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  4495. var url = event.currentTarget.getAttribute( 'href' );
  4496. if( url ) {
  4497. showPreview( url );
  4498. event.preventDefault();
  4499. }
  4500. }
  4501. }
  4502. /**
  4503. * Handles click on the auto-sliding controls element.
  4504. *
  4505. * @param {object} [event]
  4506. */
  4507. function onAutoSlidePlayerClick( event ) {
  4508. // Replay
  4509. if( Reveal.isLastSlide() && config.loop === false ) {
  4510. slide( 0, 0 );
  4511. resumeAutoSlide();
  4512. }
  4513. // Resume
  4514. else if( autoSlidePaused ) {
  4515. resumeAutoSlide();
  4516. }
  4517. // Pause
  4518. else {
  4519. pauseAutoSlide();
  4520. }
  4521. }
  4522. // --------------------------------------------------------------------//
  4523. // ------------------------ PLAYBACK COMPONENT ------------------------//
  4524. // --------------------------------------------------------------------//
  4525. /**
  4526. * Constructor for the playback component, which displays
  4527. * play/pause/progress controls.
  4528. *
  4529. * @param {HTMLElement} container The component will append
  4530. * itself to this
  4531. * @param {function} progressCheck A method which will be
  4532. * called frequently to get the current progress on a range
  4533. * of 0-1
  4534. */
  4535. function Playback( container, progressCheck ) {
  4536. // Cosmetics
  4537. this.diameter = 100;
  4538. this.diameter2 = this.diameter/2;
  4539. this.thickness = 6;
  4540. // Flags if we are currently playing
  4541. this.playing = false;
  4542. // Current progress on a 0-1 range
  4543. this.progress = 0;
  4544. // Used to loop the animation smoothly
  4545. this.progressOffset = 1;
  4546. this.container = container;
  4547. this.progressCheck = progressCheck;
  4548. this.canvas = document.createElement( 'canvas' );
  4549. this.canvas.className = 'playback';
  4550. this.canvas.width = this.diameter;
  4551. this.canvas.height = this.diameter;
  4552. this.canvas.style.width = this.diameter2 + 'px';
  4553. this.canvas.style.height = this.diameter2 + 'px';
  4554. this.context = this.canvas.getContext( '2d' );
  4555. this.container.appendChild( this.canvas );
  4556. this.render();
  4557. }
  4558. /**
  4559. * @param value
  4560. */
  4561. Playback.prototype.setPlaying = function( value ) {
  4562. var wasPlaying = this.playing;
  4563. this.playing = value;
  4564. // Start repainting if we weren't already
  4565. if( !wasPlaying && this.playing ) {
  4566. this.animate();
  4567. }
  4568. else {
  4569. this.render();
  4570. }
  4571. };
  4572. Playback.prototype.animate = function() {
  4573. var progressBefore = this.progress;
  4574. this.progress = this.progressCheck();
  4575. // When we loop, offset the progress so that it eases
  4576. // smoothly rather than immediately resetting
  4577. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  4578. this.progressOffset = this.progress;
  4579. }
  4580. this.render();
  4581. if( this.playing ) {
  4582. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  4583. }
  4584. };
  4585. /**
  4586. * Renders the current progress and playback state.
  4587. */
  4588. Playback.prototype.render = function() {
  4589. var progress = this.playing ? this.progress : 0,
  4590. radius = ( this.diameter2 ) - this.thickness,
  4591. x = this.diameter2,
  4592. y = this.diameter2,
  4593. iconSize = 28;
  4594. // Ease towards 1
  4595. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  4596. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  4597. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  4598. this.context.save();
  4599. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  4600. // Solid background color
  4601. this.context.beginPath();
  4602. this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
  4603. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  4604. this.context.fill();
  4605. // Draw progress track
  4606. this.context.beginPath();
  4607. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  4608. this.context.lineWidth = this.thickness;
  4609. this.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';
  4610. this.context.stroke();
  4611. if( this.playing ) {
  4612. // Draw progress on top of track
  4613. this.context.beginPath();
  4614. this.context.arc( x, y, radius, startAngle, endAngle, false );
  4615. this.context.lineWidth = this.thickness;
  4616. this.context.strokeStyle = '#fff';
  4617. this.context.stroke();
  4618. }
  4619. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  4620. // Draw play/pause icons
  4621. if( this.playing ) {
  4622. this.context.fillStyle = '#fff';
  4623. this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
  4624. this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
  4625. }
  4626. else {
  4627. this.context.beginPath();
  4628. this.context.translate( 4, 0 );
  4629. this.context.moveTo( 0, 0 );
  4630. this.context.lineTo( iconSize - 4, iconSize / 2 );
  4631. this.context.lineTo( 0, iconSize );
  4632. this.context.fillStyle = '#fff';
  4633. this.context.fill();
  4634. }
  4635. this.context.restore();
  4636. };
  4637. Playback.prototype.on = function( type, listener ) {
  4638. this.canvas.addEventListener( type, listener, false );
  4639. };
  4640. Playback.prototype.off = function( type, listener ) {
  4641. this.canvas.removeEventListener( type, listener, false );
  4642. };
  4643. Playback.prototype.destroy = function() {
  4644. this.playing = false;
  4645. if( this.canvas.parentNode ) {
  4646. this.container.removeChild( this.canvas );
  4647. }
  4648. };
  4649. // --------------------------------------------------------------------//
  4650. // ------------------------------- API --------------------------------//
  4651. // --------------------------------------------------------------------//
  4652. Reveal = {
  4653. VERSION: VERSION,
  4654. initialize: initialize,
  4655. configure: configure,
  4656. sync: sync,
  4657. syncSlide: syncSlide,
  4658. syncFragments: syncFragments,
  4659. // Navigation methods
  4660. slide: slide,
  4661. left: navigateLeft,
  4662. right: navigateRight,
  4663. up: navigateUp,
  4664. down: navigateDown,
  4665. prev: navigatePrev,
  4666. next: navigateNext,
  4667. // Fragment methods
  4668. navigateFragment: navigateFragment,
  4669. prevFragment: previousFragment,
  4670. nextFragment: nextFragment,
  4671. // Deprecated aliases
  4672. navigateTo: slide,
  4673. navigateLeft: navigateLeft,
  4674. navigateRight: navigateRight,
  4675. navigateUp: navigateUp,
  4676. navigateDown: navigateDown,
  4677. navigatePrev: navigatePrev,
  4678. navigateNext: navigateNext,
  4679. // Forces an update in slide layout
  4680. layout: layout,
  4681. // Randomizes the order of slides
  4682. shuffle: shuffle,
  4683. // Returns an object with the available routes as booleans (left/right/top/bottom)
  4684. availableRoutes: availableRoutes,
  4685. // Returns an object with the available fragments as booleans (prev/next)
  4686. availableFragments: availableFragments,
  4687. // Toggles a help overlay with keyboard shortcuts
  4688. toggleHelp: toggleHelp,
  4689. // Toggles the overview mode on/off
  4690. toggleOverview: toggleOverview,
  4691. // Toggles the "black screen" mode on/off
  4692. togglePause: togglePause,
  4693. // Toggles the auto slide mode on/off
  4694. toggleAutoSlide: toggleAutoSlide,
  4695. // State checks
  4696. isOverview: isOverview,
  4697. isPaused: isPaused,
  4698. isAutoSliding: isAutoSliding,
  4699. isSpeakerNotes: isSpeakerNotes,
  4700. // Slide preloading
  4701. loadSlide: loadSlide,
  4702. unloadSlide: unloadSlide,
  4703. // Adds or removes all internal event listeners (such as keyboard)
  4704. addEventListeners: addEventListeners,
  4705. removeEventListeners: removeEventListeners,
  4706. // Facility for persisting and restoring the presentation state
  4707. getState: getState,
  4708. setState: setState,
  4709. // Presentation progress
  4710. getSlidePastCount: getSlidePastCount,
  4711. // Presentation progress on range of 0-1
  4712. getProgress: getProgress,
  4713. // Returns the indices of the current, or specified, slide
  4714. getIndices: getIndices,
  4715. // Returns an Array of all slides
  4716. getSlides: getSlides,
  4717. // Returns an Array of objects representing the attributes on
  4718. // the slides
  4719. getSlidesAttributes: getSlidesAttributes,
  4720. // Returns the total number of slides
  4721. getTotalSlides: getTotalSlides,
  4722. // Returns the slide element at the specified index
  4723. getSlide: getSlide,
  4724. // Returns the slide background element at the specified index
  4725. getSlideBackground: getSlideBackground,
  4726. // Returns the speaker notes string for a slide, or null
  4727. getSlideNotes: getSlideNotes,
  4728. // Returns an array with all horizontal/vertical slides in the deck
  4729. getHorizontalSlides: getHorizontalSlides,
  4730. getVerticalSlides: getVerticalSlides,
  4731. // Checks if the presentation contains two or more
  4732. // horizontal/vertical slides
  4733. hasHorizontalSlides: hasHorizontalSlides,
  4734. hasVerticalSlides: hasVerticalSlides,
  4735. // Returns the previous slide element, may be null
  4736. getPreviousSlide: function() {
  4737. return previousSlide;
  4738. },
  4739. // Returns the current slide element
  4740. getCurrentSlide: function() {
  4741. return currentSlide;
  4742. },
  4743. // Returns the current scale of the presentation content
  4744. getScale: function() {
  4745. return scale;
  4746. },
  4747. // Returns the current configuration object
  4748. getConfig: function() {
  4749. return config;
  4750. },
  4751. // Helper method, retrieves query string as a key/value hash
  4752. getQueryHash: function() {
  4753. var query = {};
  4754. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  4755. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  4756. } );
  4757. // Basic deserialization
  4758. for( var i in query ) {
  4759. var value = query[ i ];
  4760. query[ i ] = deserialize( unescape( value ) );
  4761. }
  4762. return query;
  4763. },
  4764. // Returns the top-level DOM element
  4765. getRevealElement: function() {
  4766. return dom.wrapper || document.querySelector( '.reveal' );
  4767. },
  4768. // Returns a hash with all registered plugins
  4769. getPlugins: function() {
  4770. return plugins;
  4771. },
  4772. // Returns true if we're currently on the first slide
  4773. isFirstSlide: function() {
  4774. return ( indexh === 0 && indexv === 0 );
  4775. },
  4776. // Returns true if we're currently on the last slide
  4777. isLastSlide: function() {
  4778. if( currentSlide ) {
  4779. // Does this slide have a next sibling?
  4780. if( currentSlide.nextElementSibling ) return false;
  4781. // If it's vertical, does its parent have a next sibling?
  4782. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  4783. return true;
  4784. }
  4785. return false;
  4786. },
  4787. // Returns true if we're on the last slide in the current
  4788. // vertical stack
  4789. isLastVerticalSlide: function() {
  4790. if( currentSlide && isVerticalSlide( currentSlide ) ) {
  4791. // Does this slide have a next sibling?
  4792. if( currentSlide.nextElementSibling ) return false;
  4793. return true;
  4794. }
  4795. return false;
  4796. },
  4797. // Checks if reveal.js has been loaded and is ready for use
  4798. isReady: function() {
  4799. return loaded;
  4800. },
  4801. // Forward event binding to the reveal DOM element
  4802. addEventListener: function( type, listener, useCapture ) {
  4803. if( 'addEventListener' in window ) {
  4804. Reveal.getRevealElement().addEventListener( type, listener, useCapture );
  4805. }
  4806. },
  4807. removeEventListener: function( type, listener, useCapture ) {
  4808. if( 'addEventListener' in window ) {
  4809. Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
  4810. }
  4811. },
  4812. // Adds/removes a custom key binding
  4813. addKeyBinding: addKeyBinding,
  4814. removeKeyBinding: removeKeyBinding,
  4815. // API for registering and retrieving plugins
  4816. registerPlugin: registerPlugin,
  4817. hasPlugin: hasPlugin,
  4818. getPlugin: getPlugin,
  4819. // Programmatically triggers a keyboard event
  4820. triggerKey: function( keyCode ) {
  4821. onDocumentKeyDown( { keyCode: keyCode } );
  4822. },
  4823. // Registers a new shortcut to include in the help overlay
  4824. registerKeyboardShortcut: function( key, value ) {
  4825. keyboardShortcuts[key] = value;
  4826. }
  4827. };
  4828. return Reveal;
  4829. }));