reveal.js 168 KB

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  1. /*!
  2. * reveal.js
  3. * http://revealjs.com
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2019 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 = '3.8.0';
  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 needs to return an array
  67. // with one string [slideNumber] or three strings [n1,delimiter,n2].
  68. // 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. // Add each slide's index as attributes on itself, we need these
  652. // indices to generate slide numbers below
  653. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  654. hslide.setAttribute( 'data-index-h', h );
  655. if( hslide.classList.contains( 'stack' ) ) {
  656. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  657. vslide.setAttribute( 'data-index-h', h );
  658. vslide.setAttribute( 'data-index-v', v );
  659. } );
  660. }
  661. } );
  662. // Slide and slide background layout
  663. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  664. // Vertical stacks are not centred since their section
  665. // children will be
  666. if( slide.classList.contains( 'stack' ) === false ) {
  667. // Center the slide inside of the page, giving the slide some margin
  668. var left = ( pageWidth - slideWidth ) / 2,
  669. top = ( pageHeight - slideHeight ) / 2;
  670. var contentHeight = slide.scrollHeight;
  671. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  672. // Adhere to configured pages per slide limit
  673. numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
  674. // Center slides vertically
  675. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  676. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  677. }
  678. // Wrap the slide in a page element and hide its overflow
  679. // so that no page ever flows onto another
  680. var page = document.createElement( 'div' );
  681. page.className = 'pdf-page';
  682. page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
  683. slide.parentNode.insertBefore( page, slide );
  684. page.appendChild( slide );
  685. // Position the slide inside of the page
  686. slide.style.left = left + 'px';
  687. slide.style.top = top + 'px';
  688. slide.style.width = slideWidth + 'px';
  689. if( slide.slideBackgroundElement ) {
  690. page.insertBefore( slide.slideBackgroundElement, slide );
  691. }
  692. // Inject notes if `showNotes` is enabled
  693. if( config.showNotes ) {
  694. // Are there notes for this slide?
  695. var notes = getSlideNotes( slide );
  696. if( notes ) {
  697. var notesSpacing = 8;
  698. var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
  699. var notesElement = document.createElement( 'div' );
  700. notesElement.classList.add( 'speaker-notes' );
  701. notesElement.classList.add( 'speaker-notes-pdf' );
  702. notesElement.setAttribute( 'data-layout', notesLayout );
  703. notesElement.innerHTML = notes;
  704. if( notesLayout === 'separate-page' ) {
  705. page.parentNode.insertBefore( notesElement, page.nextSibling );
  706. }
  707. else {
  708. notesElement.style.left = notesSpacing + 'px';
  709. notesElement.style.bottom = notesSpacing + 'px';
  710. notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
  711. page.appendChild( notesElement );
  712. }
  713. }
  714. }
  715. // Inject slide numbers if `slideNumbers` are enabled
  716. if( config.slideNumber && /all|print/i.test( config.showSlideNumber ) ) {
  717. var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1,
  718. slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1;
  719. var numberElement = document.createElement( 'div' );
  720. numberElement.classList.add( 'slide-number' );
  721. numberElement.classList.add( 'slide-number-pdf' );
  722. numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV );
  723. page.appendChild( numberElement );
  724. }
  725. // Copy page and show fragments one after another
  726. if( config.pdfSeparateFragments ) {
  727. // Each fragment 'group' is an array containing one or more
  728. // fragments. Multiple fragments that appear at the same time
  729. // are part of the same group.
  730. var fragmentGroups = sortFragments( page.querySelectorAll( '.fragment' ), true );
  731. var previousFragmentStep;
  732. var previousPage;
  733. fragmentGroups.forEach( function( fragments ) {
  734. // Remove 'current-fragment' from the previous group
  735. if( previousFragmentStep ) {
  736. previousFragmentStep.forEach( function( fragment ) {
  737. fragment.classList.remove( 'current-fragment' );
  738. } );
  739. }
  740. // Show the fragments for the current index
  741. fragments.forEach( function( fragment ) {
  742. fragment.classList.add( 'visible', 'current-fragment' );
  743. } );
  744. // Create a separate page for the current fragment state
  745. var clonedPage = page.cloneNode( true );
  746. page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
  747. previousFragmentStep = fragments;
  748. previousPage = clonedPage;
  749. } );
  750. // Reset the first/original page so that all fragments are hidden
  751. fragmentGroups.forEach( function( fragments ) {
  752. fragments.forEach( function( fragment ) {
  753. fragment.classList.remove( 'visible', 'current-fragment' );
  754. } );
  755. } );
  756. }
  757. // Show all fragments
  758. else {
  759. toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) {
  760. fragment.classList.add( 'visible' );
  761. } );
  762. }
  763. }
  764. } );
  765. // Notify subscribers that the PDF layout is good to go
  766. dispatchEvent( 'pdf-ready' );
  767. }
  768. /**
  769. * This is an unfortunate necessity. Some actions – such as
  770. * an input field being focused in an iframe or using the
  771. * keyboard to expand text selection beyond the bounds of
  772. * a slide – can trigger our content to be pushed out of view.
  773. * This scrolling can not be prevented by hiding overflow in
  774. * CSS (we already do) so we have to resort to repeatedly
  775. * checking if the slides have been offset :(
  776. */
  777. function setupScrollPrevention() {
  778. setInterval( function() {
  779. if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
  780. dom.wrapper.scrollTop = 0;
  781. dom.wrapper.scrollLeft = 0;
  782. }
  783. }, 1000 );
  784. }
  785. /**
  786. * Creates an HTML element and returns a reference to it.
  787. * If the element already exists the existing instance will
  788. * be returned.
  789. *
  790. * @param {HTMLElement} container
  791. * @param {string} tagname
  792. * @param {string} classname
  793. * @param {string} innerHTML
  794. *
  795. * @return {HTMLElement}
  796. */
  797. function createSingletonNode( container, tagname, classname, innerHTML ) {
  798. // Find all nodes matching the description
  799. var nodes = container.querySelectorAll( '.' + classname );
  800. // Check all matches to find one which is a direct child of
  801. // the specified container
  802. for( var i = 0; i < nodes.length; i++ ) {
  803. var testNode = nodes[i];
  804. if( testNode.parentNode === container ) {
  805. return testNode;
  806. }
  807. }
  808. // If no node was found, create it now
  809. var node = document.createElement( tagname );
  810. node.className = classname;
  811. if( typeof innerHTML === 'string' ) {
  812. node.innerHTML = innerHTML;
  813. }
  814. container.appendChild( node );
  815. return node;
  816. }
  817. /**
  818. * Creates the slide background elements and appends them
  819. * to the background container. One element is created per
  820. * slide no matter if the given slide has visible background.
  821. */
  822. function createBackgrounds() {
  823. var printMode = isPrintingPDF();
  824. // Clear prior backgrounds
  825. dom.background.innerHTML = '';
  826. dom.background.classList.add( 'no-transition' );
  827. // Iterate over all horizontal slides
  828. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  829. var backgroundStack = createBackground( slideh, dom.background );
  830. // Iterate over all vertical slides
  831. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  832. createBackground( slidev, backgroundStack );
  833. backgroundStack.classList.add( 'stack' );
  834. } );
  835. } );
  836. // Add parallax background if specified
  837. if( config.parallaxBackgroundImage ) {
  838. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  839. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  840. dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat;
  841. dom.background.style.backgroundPosition = config.parallaxBackgroundPosition;
  842. // Make sure the below properties are set on the element - these properties are
  843. // needed for proper transitions to be set on the element via CSS. To remove
  844. // annoying background slide-in effect when the presentation starts, apply
  845. // these properties after short time delay
  846. setTimeout( function() {
  847. dom.wrapper.classList.add( 'has-parallax-background' );
  848. }, 1 );
  849. }
  850. else {
  851. dom.background.style.backgroundImage = '';
  852. dom.wrapper.classList.remove( 'has-parallax-background' );
  853. }
  854. }
  855. /**
  856. * Creates a background for the given slide.
  857. *
  858. * @param {HTMLElement} slide
  859. * @param {HTMLElement} container The element that the background
  860. * should be appended to
  861. * @return {HTMLElement} New background div
  862. */
  863. function createBackground( slide, container ) {
  864. // Main slide background element
  865. var element = document.createElement( 'div' );
  866. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  867. // Inner background element that wraps images/videos/iframes
  868. var contentElement = document.createElement( 'div' );
  869. contentElement.className = 'slide-background-content';
  870. element.appendChild( contentElement );
  871. container.appendChild( element );
  872. slide.slideBackgroundElement = element;
  873. slide.slideBackgroundContentElement = contentElement;
  874. // Syncs the background to reflect all current background settings
  875. syncBackground( slide );
  876. return element;
  877. }
  878. /**
  879. * Renders all of the visual properties of a slide background
  880. * based on the various background attributes.
  881. *
  882. * @param {HTMLElement} slide
  883. */
  884. function syncBackground( slide ) {
  885. var element = slide.slideBackgroundElement,
  886. contentElement = slide.slideBackgroundContentElement;
  887. // Reset the prior background state in case this is not the
  888. // initial sync
  889. slide.classList.remove( 'has-dark-background' );
  890. slide.classList.remove( 'has-light-background' );
  891. element.removeAttribute( 'data-loaded' );
  892. element.removeAttribute( 'data-background-hash' );
  893. element.removeAttribute( 'data-background-size' );
  894. element.removeAttribute( 'data-background-transition' );
  895. element.style.backgroundColor = '';
  896. contentElement.style.backgroundSize = '';
  897. contentElement.style.backgroundRepeat = '';
  898. contentElement.style.backgroundPosition = '';
  899. contentElement.style.backgroundImage = '';
  900. contentElement.style.opacity = '';
  901. contentElement.innerHTML = '';
  902. var data = {
  903. background: slide.getAttribute( 'data-background' ),
  904. backgroundSize: slide.getAttribute( 'data-background-size' ),
  905. backgroundImage: slide.getAttribute( 'data-background-image' ),
  906. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  907. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  908. backgroundColor: slide.getAttribute( 'data-background-color' ),
  909. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  910. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  911. backgroundTransition: slide.getAttribute( 'data-background-transition' ),
  912. backgroundOpacity: slide.getAttribute( 'data-background-opacity' )
  913. };
  914. if( data.background ) {
  915. // Auto-wrap image urls in url(...)
  916. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) {
  917. slide.setAttribute( 'data-background-image', data.background );
  918. }
  919. else {
  920. element.style.background = data.background;
  921. }
  922. }
  923. // Create a hash for this combination of background settings.
  924. // This is used to determine when two slide backgrounds are
  925. // the same.
  926. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  927. element.setAttribute( 'data-background-hash', data.background +
  928. data.backgroundSize +
  929. data.backgroundImage +
  930. data.backgroundVideo +
  931. data.backgroundIframe +
  932. data.backgroundColor +
  933. data.backgroundRepeat +
  934. data.backgroundPosition +
  935. data.backgroundTransition +
  936. data.backgroundOpacity );
  937. }
  938. // Additional and optional background properties
  939. if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );
  940. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  941. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  942. if( slide.hasAttribute( 'data-preload' ) ) element.setAttribute( 'data-preload', '' );
  943. // Background image options are set on the content wrapper
  944. if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
  945. if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;
  946. if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;
  947. if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;
  948. // If this slide has a background color, we add a class that
  949. // signals if it is light or dark. If the slide has no background
  950. // color, no class will be added
  951. var contrastColor = data.backgroundColor;
  952. // If no bg color was found, check the computed background
  953. if( !contrastColor ) {
  954. var computedBackgroundStyle = window.getComputedStyle( element );
  955. if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
  956. contrastColor = computedBackgroundStyle.backgroundColor;
  957. }
  958. }
  959. if( contrastColor ) {
  960. var rgb = colorToRgb( contrastColor );
  961. // Ignore fully transparent backgrounds. Some browsers return
  962. // rgba(0,0,0,0) when reading the computed background color of
  963. // an element with no background
  964. if( rgb && rgb.a !== 0 ) {
  965. if( colorBrightness( contrastColor ) < 128 ) {
  966. slide.classList.add( 'has-dark-background' );
  967. }
  968. else {
  969. slide.classList.add( 'has-light-background' );
  970. }
  971. }
  972. }
  973. }
  974. /**
  975. * Registers a listener to postMessage events, this makes it
  976. * possible to call all reveal.js API methods from another
  977. * window. For example:
  978. *
  979. * revealWindow.postMessage( JSON.stringify({
  980. * method: 'slide',
  981. * args: [ 2 ]
  982. * }), '*' );
  983. */
  984. function setupPostMessage() {
  985. if( config.postMessage ) {
  986. window.addEventListener( 'message', function ( event ) {
  987. var data = event.data;
  988. // Make sure we're dealing with JSON
  989. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  990. data = JSON.parse( data );
  991. // Check if the requested method can be found
  992. if( data.method && typeof Reveal[data.method] === 'function' ) {
  993. var result = Reveal[data.method].apply( Reveal, data.args );
  994. // Dispatch a postMessage event with the returned value from
  995. // our method invocation for getter functions
  996. dispatchPostMessage( 'callback', { method: data.method, result: result } );
  997. }
  998. }
  999. }, false );
  1000. }
  1001. }
  1002. /**
  1003. * Applies the configuration settings from the config
  1004. * object. May be called multiple times.
  1005. *
  1006. * @param {object} options
  1007. */
  1008. function configure( options ) {
  1009. var oldTransition = config.transition;
  1010. // New config options may be passed when this method
  1011. // is invoked through the API after initialization
  1012. if( typeof options === 'object' ) extend( config, options );
  1013. // Abort if reveal.js hasn't finished loading, config
  1014. // changes will be applied automatically once loading
  1015. // finishes
  1016. if( loaded === false ) return;
  1017. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  1018. // Remove the previously configured transition class
  1019. dom.wrapper.classList.remove( oldTransition );
  1020. // Force linear transition based on browser capabilities
  1021. if( features.transforms3d === false ) config.transition = 'linear';
  1022. dom.wrapper.classList.add( config.transition );
  1023. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  1024. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  1025. dom.controls.style.display = config.controls ? 'block' : 'none';
  1026. dom.progress.style.display = config.progress ? 'block' : 'none';
  1027. dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout );
  1028. dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
  1029. if( config.shuffle ) {
  1030. shuffle();
  1031. }
  1032. if( config.rtl ) {
  1033. dom.wrapper.classList.add( 'rtl' );
  1034. }
  1035. else {
  1036. dom.wrapper.classList.remove( 'rtl' );
  1037. }
  1038. if( config.center ) {
  1039. dom.wrapper.classList.add( 'center' );
  1040. }
  1041. else {
  1042. dom.wrapper.classList.remove( 'center' );
  1043. }
  1044. // Exit the paused mode if it was configured off
  1045. if( config.pause === false ) {
  1046. resume();
  1047. }
  1048. if( config.showNotes ) {
  1049. dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
  1050. }
  1051. if( config.mouseWheel ) {
  1052. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1053. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1054. }
  1055. else {
  1056. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1057. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1058. }
  1059. // Rolling 3D links
  1060. if( config.rollingLinks ) {
  1061. enableRollingLinks();
  1062. }
  1063. else {
  1064. disableRollingLinks();
  1065. }
  1066. // Auto-hide the mouse pointer when its inactive
  1067. if( config.hideInactiveCursor ) {
  1068. document.addEventListener( 'mousemove', onDocumentCursorActive, false );
  1069. document.addEventListener( 'mousedown', onDocumentCursorActive, false );
  1070. }
  1071. else {
  1072. showCursor();
  1073. document.removeEventListener( 'mousemove', onDocumentCursorActive, false );
  1074. document.removeEventListener( 'mousedown', onDocumentCursorActive, false );
  1075. }
  1076. // Iframe link previews
  1077. if( config.previewLinks ) {
  1078. enablePreviewLinks();
  1079. disablePreviewLinks( '[data-preview-link=false]' );
  1080. }
  1081. else {
  1082. disablePreviewLinks();
  1083. enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
  1084. }
  1085. // Remove existing auto-slide controls
  1086. if( autoSlidePlayer ) {
  1087. autoSlidePlayer.destroy();
  1088. autoSlidePlayer = null;
  1089. }
  1090. // Generate auto-slide controls if needed
  1091. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  1092. autoSlidePlayer = new Playback( dom.wrapper, function() {
  1093. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  1094. } );
  1095. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  1096. autoSlidePaused = false;
  1097. }
  1098. // When fragments are turned off they should be visible
  1099. if( config.fragments === false ) {
  1100. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  1101. element.classList.add( 'visible' );
  1102. element.classList.remove( 'current-fragment' );
  1103. } );
  1104. }
  1105. // Slide numbers
  1106. var slideNumberDisplay = 'none';
  1107. if( config.slideNumber && !isPrintingPDF() ) {
  1108. if( config.showSlideNumber === 'all' ) {
  1109. slideNumberDisplay = 'block';
  1110. }
  1111. else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) {
  1112. slideNumberDisplay = 'block';
  1113. }
  1114. }
  1115. dom.slideNumber.style.display = slideNumberDisplay;
  1116. // Add the navigation mode to the DOM so we can adjust styling
  1117. if( config.navigationMode !== 'default' ) {
  1118. dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );
  1119. }
  1120. else {
  1121. dom.wrapper.removeAttribute( 'data-navigation-mode' );
  1122. }
  1123. // Define our contextual list of keyboard shortcuts
  1124. if( config.navigationMode === 'linear' ) {
  1125. keyboardShortcuts['&#8594; , &#8595; , SPACE , N , L , J'] = 'Next slide';
  1126. keyboardShortcuts['&#8592; , &#8593; , P , H , K'] = 'Previous slide';
  1127. }
  1128. else {
  1129. keyboardShortcuts['N , SPACE'] = 'Next slide';
  1130. keyboardShortcuts['P'] = 'Previous slide';
  1131. keyboardShortcuts['&#8592; , H'] = 'Navigate left';
  1132. keyboardShortcuts['&#8594; , L'] = 'Navigate right';
  1133. keyboardShortcuts['&#8593; , K'] = 'Navigate up';
  1134. keyboardShortcuts['&#8595; , J'] = 'Navigate down';
  1135. }
  1136. keyboardShortcuts['Home , Shift &#8592;'] = 'First slide';
  1137. keyboardShortcuts['End , Shift &#8594;'] = 'Last slide';
  1138. keyboardShortcuts['B , .'] = 'Pause';
  1139. keyboardShortcuts['F'] = 'Fullscreen';
  1140. keyboardShortcuts['ESC, O'] = 'Slide overview';
  1141. sync();
  1142. }
  1143. /**
  1144. * Binds all event listeners.
  1145. */
  1146. function addEventListeners() {
  1147. eventsAreBound = true;
  1148. window.addEventListener( 'hashchange', onWindowHashChange, false );
  1149. window.addEventListener( 'resize', onWindowResize, false );
  1150. if( config.touch ) {
  1151. if( 'onpointerdown' in window ) {
  1152. // Use W3C pointer events
  1153. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  1154. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  1155. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  1156. }
  1157. else if( window.navigator.msPointerEnabled ) {
  1158. // IE 10 uses prefixed version of pointer events
  1159. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  1160. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  1161. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  1162. }
  1163. else {
  1164. // Fall back to touch events
  1165. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  1166. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  1167. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  1168. }
  1169. }
  1170. if( config.keyboard ) {
  1171. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  1172. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  1173. }
  1174. if( config.progress && dom.progress ) {
  1175. dom.progress.addEventListener( 'click', onProgressClicked, false );
  1176. }
  1177. dom.pauseOverlay.addEventListener( 'click', resume, false );
  1178. if( config.focusBodyOnPageVisibilityChange ) {
  1179. var visibilityChange;
  1180. if( 'hidden' in document ) {
  1181. visibilityChange = 'visibilitychange';
  1182. }
  1183. else if( 'msHidden' in document ) {
  1184. visibilityChange = 'msvisibilitychange';
  1185. }
  1186. else if( 'webkitHidden' in document ) {
  1187. visibilityChange = 'webkitvisibilitychange';
  1188. }
  1189. if( visibilityChange ) {
  1190. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  1191. }
  1192. }
  1193. // Listen to both touch and click events, in case the device
  1194. // supports both
  1195. var pointerEvents = [ 'touchstart', 'click' ];
  1196. // Only support touch for Android, fixes double navigations in
  1197. // stock browser
  1198. if( UA.match( /android/gi ) ) {
  1199. pointerEvents = [ 'touchstart' ];
  1200. }
  1201. pointerEvents.forEach( function( eventName ) {
  1202. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  1203. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  1204. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  1205. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  1206. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  1207. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  1208. } );
  1209. }
  1210. /**
  1211. * Unbinds all event listeners.
  1212. */
  1213. function removeEventListeners() {
  1214. eventsAreBound = false;
  1215. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  1216. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  1217. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  1218. window.removeEventListener( 'resize', onWindowResize, false );
  1219. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  1220. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  1221. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  1222. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  1223. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  1224. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  1225. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  1226. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  1227. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  1228. dom.pauseOverlay.removeEventListener( 'click', resume, false );
  1229. if ( config.progress && dom.progress ) {
  1230. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  1231. }
  1232. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  1233. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  1234. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  1235. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  1236. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  1237. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  1238. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  1239. } );
  1240. }
  1241. /**
  1242. * Registers a new plugin with this reveal.js instance.
  1243. *
  1244. * reveal.js waits for all regisered plugins to initialize
  1245. * before considering itself ready, as long as the plugin
  1246. * is registered before calling `Reveal.initialize()`.
  1247. */
  1248. function registerPlugin( id, plugin ) {
  1249. if( plugins[id] === undefined ) {
  1250. plugins[id] = plugin;
  1251. // If a plugin is registered after reveal.js is loaded,
  1252. // initialize it right away
  1253. if( loaded && typeof plugin.init === 'function' ) {
  1254. plugin.init();
  1255. }
  1256. }
  1257. else {
  1258. console.warn( 'reveal.js: "'+ id +'" plugin has already been registered' );
  1259. }
  1260. }
  1261. /**
  1262. * Checks if a specific plugin has been registered.
  1263. *
  1264. * @param {String} id Unique plugin identifier
  1265. */
  1266. function hasPlugin( id ) {
  1267. return !!plugins[id];
  1268. }
  1269. /**
  1270. * Returns the specific plugin instance, if a plugin
  1271. * with the given ID has been registered.
  1272. *
  1273. * @param {String} id Unique plugin identifier
  1274. */
  1275. function getPlugin( id ) {
  1276. return plugins[id];
  1277. }
  1278. /**
  1279. * Add a custom key binding with optional description to
  1280. * be added to the help screen.
  1281. */
  1282. function addKeyBinding( binding, callback ) {
  1283. if( typeof binding === 'object' && binding.keyCode ) {
  1284. registeredKeyBindings[binding.keyCode] = {
  1285. callback: callback,
  1286. key: binding.key,
  1287. description: binding.description
  1288. };
  1289. }
  1290. else {
  1291. registeredKeyBindings[binding] = {
  1292. callback: callback,
  1293. key: null,
  1294. description: null
  1295. };
  1296. }
  1297. }
  1298. /**
  1299. * Removes the specified custom key binding.
  1300. */
  1301. function removeKeyBinding( keyCode ) {
  1302. delete registeredKeyBindings[keyCode];
  1303. }
  1304. /**
  1305. * Extend object a with the properties of object b.
  1306. * If there's a conflict, object b takes precedence.
  1307. *
  1308. * @param {object} a
  1309. * @param {object} b
  1310. */
  1311. function extend( a, b ) {
  1312. for( var i in b ) {
  1313. a[ i ] = b[ i ];
  1314. }
  1315. return a;
  1316. }
  1317. /**
  1318. * Converts the target object to an array.
  1319. *
  1320. * @param {object} o
  1321. * @return {object[]}
  1322. */
  1323. function toArray( o ) {
  1324. return Array.prototype.slice.call( o );
  1325. }
  1326. /**
  1327. * Utility for deserializing a value.
  1328. *
  1329. * @param {*} value
  1330. * @return {*}
  1331. */
  1332. function deserialize( value ) {
  1333. if( typeof value === 'string' ) {
  1334. if( value === 'null' ) return null;
  1335. else if( value === 'true' ) return true;
  1336. else if( value === 'false' ) return false;
  1337. else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
  1338. }
  1339. return value;
  1340. }
  1341. /**
  1342. * Measures the distance in pixels between point a
  1343. * and point b.
  1344. *
  1345. * @param {object} a point with x/y properties
  1346. * @param {object} b point with x/y properties
  1347. *
  1348. * @return {number}
  1349. */
  1350. function distanceBetween( a, b ) {
  1351. var dx = a.x - b.x,
  1352. dy = a.y - b.y;
  1353. return Math.sqrt( dx*dx + dy*dy );
  1354. }
  1355. /**
  1356. * Applies a CSS transform to the target element.
  1357. *
  1358. * @param {HTMLElement} element
  1359. * @param {string} transform
  1360. */
  1361. function transformElement( element, transform ) {
  1362. element.style.WebkitTransform = transform;
  1363. element.style.MozTransform = transform;
  1364. element.style.msTransform = transform;
  1365. element.style.transform = transform;
  1366. }
  1367. /**
  1368. * Applies CSS transforms to the slides container. The container
  1369. * is transformed from two separate sources: layout and the overview
  1370. * mode.
  1371. *
  1372. * @param {object} transforms
  1373. */
  1374. function transformSlides( transforms ) {
  1375. // Pick up new transforms from arguments
  1376. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  1377. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  1378. // Apply the transforms to the slides container
  1379. if( slidesTransform.layout ) {
  1380. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  1381. }
  1382. else {
  1383. transformElement( dom.slides, slidesTransform.overview );
  1384. }
  1385. }
  1386. /**
  1387. * Injects the given CSS styles into the DOM.
  1388. *
  1389. * @param {string} value
  1390. */
  1391. function injectStyleSheet( value ) {
  1392. var tag = document.createElement( 'style' );
  1393. tag.type = 'text/css';
  1394. if( tag.styleSheet ) {
  1395. tag.styleSheet.cssText = value;
  1396. }
  1397. else {
  1398. tag.appendChild( document.createTextNode( value ) );
  1399. }
  1400. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  1401. }
  1402. /**
  1403. * Find the closest parent that matches the given
  1404. * selector.
  1405. *
  1406. * @param {HTMLElement} target The child element
  1407. * @param {String} selector The CSS selector to match
  1408. * the parents against
  1409. *
  1410. * @return {HTMLElement} The matched parent or null
  1411. * if no matching parent was found
  1412. */
  1413. function closestParent( target, selector ) {
  1414. var parent = target.parentNode;
  1415. while( parent ) {
  1416. // There's some overhead doing this each time, we don't
  1417. // want to rewrite the element prototype but should still
  1418. // be enough to feature detect once at startup...
  1419. var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
  1420. // If we find a match, we're all set
  1421. if( matchesMethod && matchesMethod.call( parent, selector ) ) {
  1422. return parent;
  1423. }
  1424. // Keep searching
  1425. parent = parent.parentNode;
  1426. }
  1427. return null;
  1428. }
  1429. /**
  1430. * Converts various color input formats to an {r:0,g:0,b:0} object.
  1431. *
  1432. * @param {string} color The string representation of a color
  1433. * @example
  1434. * colorToRgb('#000');
  1435. * @example
  1436. * colorToRgb('#000000');
  1437. * @example
  1438. * colorToRgb('rgb(0,0,0)');
  1439. * @example
  1440. * colorToRgb('rgba(0,0,0)');
  1441. *
  1442. * @return {{r: number, g: number, b: number, [a]: number}|null}
  1443. */
  1444. function colorToRgb( color ) {
  1445. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  1446. if( hex3 && hex3[1] ) {
  1447. hex3 = hex3[1];
  1448. return {
  1449. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  1450. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  1451. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  1452. };
  1453. }
  1454. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  1455. if( hex6 && hex6[1] ) {
  1456. hex6 = hex6[1];
  1457. return {
  1458. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  1459. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  1460. b: parseInt( hex6.substr( 4, 2 ), 16 )
  1461. };
  1462. }
  1463. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  1464. if( rgb ) {
  1465. return {
  1466. r: parseInt( rgb[1], 10 ),
  1467. g: parseInt( rgb[2], 10 ),
  1468. b: parseInt( rgb[3], 10 )
  1469. };
  1470. }
  1471. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  1472. if( rgba ) {
  1473. return {
  1474. r: parseInt( rgba[1], 10 ),
  1475. g: parseInt( rgba[2], 10 ),
  1476. b: parseInt( rgba[3], 10 ),
  1477. a: parseFloat( rgba[4] )
  1478. };
  1479. }
  1480. return null;
  1481. }
  1482. /**
  1483. * Calculates brightness on a scale of 0-255.
  1484. *
  1485. * @param {string} color See colorToRgb for supported formats.
  1486. * @see {@link colorToRgb}
  1487. */
  1488. function colorBrightness( color ) {
  1489. if( typeof color === 'string' ) color = colorToRgb( color );
  1490. if( color ) {
  1491. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  1492. }
  1493. return null;
  1494. }
  1495. /**
  1496. * Returns the remaining height within the parent of the
  1497. * target element.
  1498. *
  1499. * remaining height = [ configured parent height ] - [ current parent height ]
  1500. *
  1501. * @param {HTMLElement} element
  1502. * @param {number} [height]
  1503. */
  1504. function getRemainingHeight( element, height ) {
  1505. height = height || 0;
  1506. if( element ) {
  1507. var newHeight, oldHeight = element.style.height;
  1508. // Change the .stretch element height to 0 in order find the height of all
  1509. // the other elements
  1510. element.style.height = '0px';
  1511. // In Overview mode, the parent (.slide) height is set of 700px.
  1512. // Restore it temporarily to its natural height.
  1513. element.parentNode.style.height = 'auto';
  1514. newHeight = height - element.parentNode.offsetHeight;
  1515. // Restore the old height, just in case
  1516. element.style.height = oldHeight + 'px';
  1517. // Clear the parent (.slide) height. .removeProperty works in IE9+
  1518. element.parentNode.style.removeProperty('height');
  1519. return newHeight;
  1520. }
  1521. return height;
  1522. }
  1523. /**
  1524. * Checks if this instance is being used to print a PDF.
  1525. */
  1526. function isPrintingPDF() {
  1527. return ( /print-pdf/gi ).test( window.location.search );
  1528. }
  1529. /**
  1530. * Hides the address bar if we're on a mobile device.
  1531. */
  1532. function hideAddressBar() {
  1533. if( config.hideAddressBar && isMobileDevice ) {
  1534. // Events that should trigger the address bar to hide
  1535. window.addEventListener( 'load', removeAddressBar, false );
  1536. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1537. }
  1538. }
  1539. /**
  1540. * Causes the address bar to hide on mobile devices,
  1541. * more vertical space ftw.
  1542. */
  1543. function removeAddressBar() {
  1544. setTimeout( function() {
  1545. window.scrollTo( 0, 1 );
  1546. }, 10 );
  1547. }
  1548. /**
  1549. * Dispatches an event of the specified type from the
  1550. * reveal DOM element.
  1551. */
  1552. function dispatchEvent( type, args ) {
  1553. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1554. event.initEvent( type, true, true );
  1555. extend( event, args );
  1556. dom.wrapper.dispatchEvent( event );
  1557. // If we're in an iframe, post each reveal.js event to the
  1558. // parent window. Used by the notes plugin
  1559. dispatchPostMessage( type );
  1560. }
  1561. /**
  1562. * Dispatched a postMessage of the given type from our window.
  1563. */
  1564. function dispatchPostMessage( type, data ) {
  1565. if( config.postMessageEvents && window.parent !== window.self ) {
  1566. var message = {
  1567. namespace: 'reveal',
  1568. eventName: type,
  1569. state: getState()
  1570. };
  1571. extend( message, data );
  1572. window.parent.postMessage( JSON.stringify( message ), '*' );
  1573. }
  1574. }
  1575. /**
  1576. * Wrap all links in 3D goodness.
  1577. */
  1578. function enableRollingLinks() {
  1579. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1580. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1581. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1582. var anchor = anchors[i];
  1583. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1584. var span = document.createElement('span');
  1585. span.setAttribute('data-title', anchor.text);
  1586. span.innerHTML = anchor.innerHTML;
  1587. anchor.classList.add( 'roll' );
  1588. anchor.innerHTML = '';
  1589. anchor.appendChild(span);
  1590. }
  1591. }
  1592. }
  1593. }
  1594. /**
  1595. * Unwrap all 3D links.
  1596. */
  1597. function disableRollingLinks() {
  1598. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1599. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1600. var anchor = anchors[i];
  1601. var span = anchor.querySelector( 'span' );
  1602. if( span ) {
  1603. anchor.classList.remove( 'roll' );
  1604. anchor.innerHTML = span.innerHTML;
  1605. }
  1606. }
  1607. }
  1608. /**
  1609. * Bind preview frame links.
  1610. *
  1611. * @param {string} [selector=a] - selector for anchors
  1612. */
  1613. function enablePreviewLinks( selector ) {
  1614. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1615. anchors.forEach( function( element ) {
  1616. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1617. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1618. }
  1619. } );
  1620. }
  1621. /**
  1622. * Unbind preview frame links.
  1623. */
  1624. function disablePreviewLinks( selector ) {
  1625. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1626. anchors.forEach( function( element ) {
  1627. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1628. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1629. }
  1630. } );
  1631. }
  1632. /**
  1633. * Opens a preview window for the target URL.
  1634. *
  1635. * @param {string} url - url for preview iframe src
  1636. */
  1637. function showPreview( url ) {
  1638. closeOverlay();
  1639. dom.overlay = document.createElement( 'div' );
  1640. dom.overlay.classList.add( 'overlay' );
  1641. dom.overlay.classList.add( 'overlay-preview' );
  1642. dom.wrapper.appendChild( dom.overlay );
  1643. dom.overlay.innerHTML = [
  1644. '<header>',
  1645. '<a class="close" href="#"><span class="icon"></span></a>',
  1646. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1647. '</header>',
  1648. '<div class="spinner"></div>',
  1649. '<div class="viewport">',
  1650. '<iframe src="'+ url +'"></iframe>',
  1651. '<small class="viewport-inner">',
  1652. '<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>',
  1653. '</small>',
  1654. '</div>'
  1655. ].join('');
  1656. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1657. dom.overlay.classList.add( 'loaded' );
  1658. }, false );
  1659. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1660. closeOverlay();
  1661. event.preventDefault();
  1662. }, false );
  1663. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1664. closeOverlay();
  1665. }, false );
  1666. setTimeout( function() {
  1667. dom.overlay.classList.add( 'visible' );
  1668. }, 1 );
  1669. }
  1670. /**
  1671. * Open or close help overlay window.
  1672. *
  1673. * @param {Boolean} [override] Flag which overrides the
  1674. * toggle logic and forcibly sets the desired state. True means
  1675. * help is open, false means it's closed.
  1676. */
  1677. function toggleHelp( override ){
  1678. if( typeof override === 'boolean' ) {
  1679. override ? showHelp() : closeOverlay();
  1680. }
  1681. else {
  1682. if( dom.overlay ) {
  1683. closeOverlay();
  1684. }
  1685. else {
  1686. showHelp();
  1687. }
  1688. }
  1689. }
  1690. /**
  1691. * Opens an overlay window with help material.
  1692. */
  1693. function showHelp() {
  1694. if( config.help ) {
  1695. closeOverlay();
  1696. dom.overlay = document.createElement( 'div' );
  1697. dom.overlay.classList.add( 'overlay' );
  1698. dom.overlay.classList.add( 'overlay-help' );
  1699. dom.wrapper.appendChild( dom.overlay );
  1700. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1701. html += '<table><th>KEY</th><th>ACTION</th>';
  1702. for( var key in keyboardShortcuts ) {
  1703. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1704. }
  1705. // Add custom key bindings that have associated descriptions
  1706. for( var binding in registeredKeyBindings ) {
  1707. if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) {
  1708. html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</td></tr>';
  1709. }
  1710. }
  1711. html += '</table>';
  1712. dom.overlay.innerHTML = [
  1713. '<header>',
  1714. '<a class="close" href="#"><span class="icon"></span></a>',
  1715. '</header>',
  1716. '<div class="viewport">',
  1717. '<div class="viewport-inner">'+ html +'</div>',
  1718. '</div>'
  1719. ].join('');
  1720. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1721. closeOverlay();
  1722. event.preventDefault();
  1723. }, false );
  1724. setTimeout( function() {
  1725. dom.overlay.classList.add( 'visible' );
  1726. }, 1 );
  1727. }
  1728. }
  1729. /**
  1730. * Closes any currently open overlay.
  1731. */
  1732. function closeOverlay() {
  1733. if( dom.overlay ) {
  1734. dom.overlay.parentNode.removeChild( dom.overlay );
  1735. dom.overlay = null;
  1736. }
  1737. }
  1738. /**
  1739. * Applies JavaScript-controlled layout rules to the
  1740. * presentation.
  1741. */
  1742. function layout() {
  1743. if( dom.wrapper && !isPrintingPDF() ) {
  1744. if( !config.disableLayout ) {
  1745. // On some mobile devices '100vh' is taller than the visible
  1746. // viewport which leads to part of the presentation being
  1747. // cut off. To work around this we define our own '--vh' custom
  1748. // property where 100x adds up to the correct height.
  1749. //
  1750. // https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
  1751. if( isMobileDevice ) {
  1752. document.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );
  1753. }
  1754. var size = getComputedSlideSize();
  1755. var oldScale = scale;
  1756. // Layout the contents of the slides
  1757. layoutSlideContents( config.width, config.height );
  1758. dom.slides.style.width = size.width + 'px';
  1759. dom.slides.style.height = size.height + 'px';
  1760. // Determine scale of content to fit within available space
  1761. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1762. // Respect max/min scale settings
  1763. scale = Math.max( scale, config.minScale );
  1764. scale = Math.min( scale, config.maxScale );
  1765. // Don't apply any scaling styles if scale is 1
  1766. if( scale === 1 ) {
  1767. dom.slides.style.zoom = '';
  1768. dom.slides.style.left = '';
  1769. dom.slides.style.top = '';
  1770. dom.slides.style.bottom = '';
  1771. dom.slides.style.right = '';
  1772. transformSlides( { layout: '' } );
  1773. }
  1774. else {
  1775. // Zoom Scaling
  1776. // Content remains crisp no matter how much we scale. Side
  1777. // effects are minor differences in text layout and iframe
  1778. // viewports changing size. A 200x200 iframe viewport in a
  1779. // 2x zoomed presentation ends up having a 400x400 viewport.
  1780. if( scale > 1 && features.zoom && window.devicePixelRatio < 2 ) {
  1781. dom.slides.style.zoom = scale;
  1782. dom.slides.style.left = '';
  1783. dom.slides.style.top = '';
  1784. dom.slides.style.bottom = '';
  1785. dom.slides.style.right = '';
  1786. transformSlides( { layout: '' } );
  1787. }
  1788. // Transform Scaling
  1789. // Content layout remains the exact same when scaled up.
  1790. // Side effect is content becoming blurred, especially with
  1791. // high scale values on ldpi screens.
  1792. else {
  1793. dom.slides.style.zoom = '';
  1794. dom.slides.style.left = '50%';
  1795. dom.slides.style.top = '50%';
  1796. dom.slides.style.bottom = 'auto';
  1797. dom.slides.style.right = 'auto';
  1798. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1799. }
  1800. }
  1801. // Select all slides, vertical and horizontal
  1802. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1803. for( var i = 0, len = slides.length; i < len; i++ ) {
  1804. var slide = slides[ i ];
  1805. // Don't bother updating invisible slides
  1806. if( slide.style.display === 'none' ) {
  1807. continue;
  1808. }
  1809. if( config.center || slide.classList.contains( 'center' ) ) {
  1810. // Vertical stacks are not centred since their section
  1811. // children will be
  1812. if( slide.classList.contains( 'stack' ) ) {
  1813. slide.style.top = 0;
  1814. }
  1815. else {
  1816. slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
  1817. }
  1818. }
  1819. else {
  1820. slide.style.top = '';
  1821. }
  1822. }
  1823. if( oldScale !== scale ) {
  1824. dispatchEvent( 'resize', {
  1825. 'oldScale': oldScale,
  1826. 'scale': scale,
  1827. 'size': size
  1828. } );
  1829. }
  1830. }
  1831. updateProgress();
  1832. updateParallax();
  1833. if( isOverview() ) {
  1834. updateOverview();
  1835. }
  1836. }
  1837. }
  1838. /**
  1839. * Applies layout logic to the contents of all slides in
  1840. * the presentation.
  1841. *
  1842. * @param {string|number} width
  1843. * @param {string|number} height
  1844. */
  1845. function layoutSlideContents( width, height ) {
  1846. // Handle sizing of elements with the 'stretch' class
  1847. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1848. // Determine how much vertical space we can use
  1849. var remainingHeight = getRemainingHeight( element, height );
  1850. // Consider the aspect ratio of media elements
  1851. if( /(img|video)/gi.test( element.nodeName ) ) {
  1852. var nw = element.naturalWidth || element.videoWidth,
  1853. nh = element.naturalHeight || element.videoHeight;
  1854. var es = Math.min( width / nw, remainingHeight / nh );
  1855. element.style.width = ( nw * es ) + 'px';
  1856. element.style.height = ( nh * es ) + 'px';
  1857. }
  1858. else {
  1859. element.style.width = width + 'px';
  1860. element.style.height = remainingHeight + 'px';
  1861. }
  1862. } );
  1863. }
  1864. /**
  1865. * Calculates the computed pixel size of our slides. These
  1866. * values are based on the width and height configuration
  1867. * options.
  1868. *
  1869. * @param {number} [presentationWidth=dom.wrapper.offsetWidth]
  1870. * @param {number} [presentationHeight=dom.wrapper.offsetHeight]
  1871. */
  1872. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1873. var size = {
  1874. // Slide size
  1875. width: config.width,
  1876. height: config.height,
  1877. // Presentation size
  1878. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1879. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1880. };
  1881. // Reduce available space by margin
  1882. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1883. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1884. // Slide width may be a percentage of available width
  1885. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1886. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1887. }
  1888. // Slide height may be a percentage of available height
  1889. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1890. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1891. }
  1892. return size;
  1893. }
  1894. /**
  1895. * Stores the vertical index of a stack so that the same
  1896. * vertical slide can be selected when navigating to and
  1897. * from the stack.
  1898. *
  1899. * @param {HTMLElement} stack The vertical stack element
  1900. * @param {string|number} [v=0] Index to memorize
  1901. */
  1902. function setPreviousVerticalIndex( stack, v ) {
  1903. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1904. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1905. }
  1906. }
  1907. /**
  1908. * Retrieves the vertical index which was stored using
  1909. * #setPreviousVerticalIndex() or 0 if no previous index
  1910. * exists.
  1911. *
  1912. * @param {HTMLElement} stack The vertical stack element
  1913. */
  1914. function getPreviousVerticalIndex( stack ) {
  1915. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1916. // Prefer manually defined start-indexv
  1917. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1918. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1919. }
  1920. return 0;
  1921. }
  1922. /**
  1923. * Displays the overview of slides (quick nav) by scaling
  1924. * down and arranging all slide elements.
  1925. */
  1926. function activateOverview() {
  1927. // Only proceed if enabled in config
  1928. if( config.overview && !isOverview() ) {
  1929. overview = true;
  1930. dom.wrapper.classList.add( 'overview' );
  1931. dom.wrapper.classList.remove( 'overview-deactivating' );
  1932. if( features.overviewTransitions ) {
  1933. setTimeout( function() {
  1934. dom.wrapper.classList.add( 'overview-animated' );
  1935. }, 1 );
  1936. }
  1937. // Don't auto-slide while in overview mode
  1938. cancelAutoSlide();
  1939. // Move the backgrounds element into the slide container to
  1940. // that the same scaling is applied
  1941. dom.slides.appendChild( dom.background );
  1942. // Clicking on an overview slide navigates to it
  1943. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1944. if( !slide.classList.contains( 'stack' ) ) {
  1945. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1946. }
  1947. } );
  1948. // Calculate slide sizes
  1949. var margin = 70;
  1950. var slideSize = getComputedSlideSize();
  1951. overviewSlideWidth = slideSize.width + margin;
  1952. overviewSlideHeight = slideSize.height + margin;
  1953. // Reverse in RTL mode
  1954. if( config.rtl ) {
  1955. overviewSlideWidth = -overviewSlideWidth;
  1956. }
  1957. updateSlidesVisibility();
  1958. layoutOverview();
  1959. updateOverview();
  1960. layout();
  1961. // Notify observers of the overview showing
  1962. dispatchEvent( 'overviewshown', {
  1963. 'indexh': indexh,
  1964. 'indexv': indexv,
  1965. 'currentSlide': currentSlide
  1966. } );
  1967. }
  1968. }
  1969. /**
  1970. * Uses CSS transforms to position all slides in a grid for
  1971. * display inside of the overview mode.
  1972. */
  1973. function layoutOverview() {
  1974. // Layout slides
  1975. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1976. hslide.setAttribute( 'data-index-h', h );
  1977. transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1978. if( hslide.classList.contains( 'stack' ) ) {
  1979. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1980. vslide.setAttribute( 'data-index-h', h );
  1981. vslide.setAttribute( 'data-index-v', v );
  1982. transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1983. } );
  1984. }
  1985. } );
  1986. // Layout slide backgrounds
  1987. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1988. transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1989. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1990. transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1991. } );
  1992. } );
  1993. }
  1994. /**
  1995. * Moves the overview viewport to the current slides.
  1996. * Called each time the current slide changes.
  1997. */
  1998. function updateOverview() {
  1999. var vmin = Math.min( window.innerWidth, window.innerHeight );
  2000. var scale = Math.max( vmin / 5, 150 ) / vmin;
  2001. transformSlides( {
  2002. overview: [
  2003. 'scale('+ scale +')',
  2004. 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
  2005. 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)'
  2006. ].join( ' ' )
  2007. } );
  2008. }
  2009. /**
  2010. * Exits the slide overview and enters the currently
  2011. * active slide.
  2012. */
  2013. function deactivateOverview() {
  2014. // Only proceed if enabled in config
  2015. if( config.overview ) {
  2016. overview = false;
  2017. dom.wrapper.classList.remove( 'overview' );
  2018. dom.wrapper.classList.remove( 'overview-animated' );
  2019. // Temporarily add a class so that transitions can do different things
  2020. // depending on whether they are exiting/entering overview, or just
  2021. // moving from slide to slide
  2022. dom.wrapper.classList.add( 'overview-deactivating' );
  2023. setTimeout( function () {
  2024. dom.wrapper.classList.remove( 'overview-deactivating' );
  2025. }, 1 );
  2026. // Move the background element back out
  2027. dom.wrapper.appendChild( dom.background );
  2028. // Clean up changes made to slides
  2029. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  2030. transformElement( slide, '' );
  2031. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  2032. } );
  2033. // Clean up changes made to backgrounds
  2034. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  2035. transformElement( background, '' );
  2036. } );
  2037. transformSlides( { overview: '' } );
  2038. slide( indexh, indexv );
  2039. layout();
  2040. cueAutoSlide();
  2041. // Notify observers of the overview hiding
  2042. dispatchEvent( 'overviewhidden', {
  2043. 'indexh': indexh,
  2044. 'indexv': indexv,
  2045. 'currentSlide': currentSlide
  2046. } );
  2047. }
  2048. }
  2049. /**
  2050. * Toggles the slide overview mode on and off.
  2051. *
  2052. * @param {Boolean} [override] Flag which overrides the
  2053. * toggle logic and forcibly sets the desired state. True means
  2054. * overview is open, false means it's closed.
  2055. */
  2056. function toggleOverview( override ) {
  2057. if( typeof override === 'boolean' ) {
  2058. override ? activateOverview() : deactivateOverview();
  2059. }
  2060. else {
  2061. isOverview() ? deactivateOverview() : activateOverview();
  2062. }
  2063. }
  2064. /**
  2065. * Checks if the overview is currently active.
  2066. *
  2067. * @return {Boolean} true if the overview is active,
  2068. * false otherwise
  2069. */
  2070. function isOverview() {
  2071. return overview;
  2072. }
  2073. /**
  2074. * Return a hash URL that will resolve to the current slide location.
  2075. */
  2076. function locationHash() {
  2077. var url = '/';
  2078. // Attempt to create a named link based on the slide's ID
  2079. var id = currentSlide ? currentSlide.getAttribute( 'id' ) : null;
  2080. if( id ) {
  2081. id = encodeURIComponent( id );
  2082. }
  2083. var indexf;
  2084. if( config.fragmentInURL ) {
  2085. indexf = getIndices().f;
  2086. }
  2087. // If the current slide has an ID, use that as a named link,
  2088. // but we don't support named links with a fragment index
  2089. if( typeof id === 'string' && id.length && indexf === undefined ) {
  2090. url = '/' + id;
  2091. }
  2092. // Otherwise use the /h/v index
  2093. else {
  2094. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  2095. if( indexh > 0 || indexv > 0 || indexf !== undefined ) url += indexh + hashIndexBase;
  2096. if( indexv > 0 || indexf !== undefined ) url += '/' + (indexv + hashIndexBase );
  2097. if( indexf !== undefined ) url += '/' + indexf;
  2098. }
  2099. return url;
  2100. }
  2101. /**
  2102. * Checks if the current or specified slide is vertical
  2103. * (nested within another slide).
  2104. *
  2105. * @param {HTMLElement} [slide=currentSlide] The slide to check
  2106. * orientation of
  2107. * @return {Boolean}
  2108. */
  2109. function isVerticalSlide( slide ) {
  2110. // Prefer slide argument, otherwise use current slide
  2111. slide = slide ? slide : currentSlide;
  2112. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  2113. }
  2114. /**
  2115. * Handling the fullscreen functionality via the fullscreen API
  2116. *
  2117. * @see http://fullscreen.spec.whatwg.org/
  2118. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  2119. */
  2120. function enterFullscreen() {
  2121. var element = document.documentElement;
  2122. // Check which implementation is available
  2123. var requestMethod = element.requestFullscreen ||
  2124. element.webkitRequestFullscreen ||
  2125. element.webkitRequestFullScreen ||
  2126. element.mozRequestFullScreen ||
  2127. element.msRequestFullscreen;
  2128. if( requestMethod ) {
  2129. requestMethod.apply( element );
  2130. }
  2131. }
  2132. /**
  2133. * Shows the mouse pointer after it has been hidden with
  2134. * #hideCursor.
  2135. */
  2136. function showCursor() {
  2137. if( cursorHidden ) {
  2138. cursorHidden = false;
  2139. dom.wrapper.style.cursor = '';
  2140. }
  2141. }
  2142. /**
  2143. * Hides the mouse pointer when it's on top of the .reveal
  2144. * container.
  2145. */
  2146. function hideCursor() {
  2147. if( cursorHidden === false ) {
  2148. cursorHidden = true;
  2149. dom.wrapper.style.cursor = 'none';
  2150. }
  2151. }
  2152. /**
  2153. * Enters the paused mode which fades everything on screen to
  2154. * black.
  2155. */
  2156. function pause() {
  2157. if( config.pause ) {
  2158. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2159. cancelAutoSlide();
  2160. dom.wrapper.classList.add( 'paused' );
  2161. if( wasPaused === false ) {
  2162. dispatchEvent( 'paused' );
  2163. }
  2164. }
  2165. }
  2166. /**
  2167. * Exits from the paused mode.
  2168. */
  2169. function resume() {
  2170. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2171. dom.wrapper.classList.remove( 'paused' );
  2172. cueAutoSlide();
  2173. if( wasPaused ) {
  2174. dispatchEvent( 'resumed' );
  2175. }
  2176. }
  2177. /**
  2178. * Toggles the paused mode on and off.
  2179. */
  2180. function togglePause( override ) {
  2181. if( typeof override === 'boolean' ) {
  2182. override ? pause() : resume();
  2183. }
  2184. else {
  2185. isPaused() ? resume() : pause();
  2186. }
  2187. }
  2188. /**
  2189. * Checks if we are currently in the paused mode.
  2190. *
  2191. * @return {Boolean}
  2192. */
  2193. function isPaused() {
  2194. return dom.wrapper.classList.contains( 'paused' );
  2195. }
  2196. /**
  2197. * Toggles the auto slide mode on and off.
  2198. *
  2199. * @param {Boolean} [override] Flag which sets the desired state.
  2200. * True means autoplay starts, false means it stops.
  2201. */
  2202. function toggleAutoSlide( override ) {
  2203. if( typeof override === 'boolean' ) {
  2204. override ? resumeAutoSlide() : pauseAutoSlide();
  2205. }
  2206. else {
  2207. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  2208. }
  2209. }
  2210. /**
  2211. * Checks if the auto slide mode is currently on.
  2212. *
  2213. * @return {Boolean}
  2214. */
  2215. function isAutoSliding() {
  2216. return !!( autoSlide && !autoSlidePaused );
  2217. }
  2218. /**
  2219. * Steps from the current point in the presentation to the
  2220. * slide which matches the specified horizontal and vertical
  2221. * indices.
  2222. *
  2223. * @param {number} [h=indexh] Horizontal index of the target slide
  2224. * @param {number} [v=indexv] Vertical index of the target slide
  2225. * @param {number} [f] Index of a fragment within the
  2226. * target slide to activate
  2227. * @param {number} [o] Origin for use in multimaster environments
  2228. */
  2229. function slide( h, v, f, o ) {
  2230. // Remember where we were at before
  2231. previousSlide = currentSlide;
  2232. // Query all horizontal slides in the deck
  2233. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  2234. // Abort if there are no slides
  2235. if( horizontalSlides.length === 0 ) return;
  2236. // If no vertical index is specified and the upcoming slide is a
  2237. // stack, resume at its previous vertical index
  2238. if( v === undefined && !isOverview() ) {
  2239. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  2240. }
  2241. // If we were on a vertical stack, remember what vertical index
  2242. // it was on so we can resume at the same position when returning
  2243. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  2244. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  2245. }
  2246. // Remember the state before this slide
  2247. var stateBefore = state.concat();
  2248. // Reset the state array
  2249. state.length = 0;
  2250. var indexhBefore = indexh || 0,
  2251. indexvBefore = indexv || 0;
  2252. // Activate and transition to the new slide
  2253. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  2254. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  2255. // Update the visibility of slides now that the indices have changed
  2256. updateSlidesVisibility();
  2257. layout();
  2258. // Update the overview if it's currently active
  2259. if( isOverview() ) {
  2260. updateOverview();
  2261. }
  2262. // Find the current horizontal slide and any possible vertical slides
  2263. // within it
  2264. var currentHorizontalSlide = horizontalSlides[ indexh ],
  2265. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  2266. // Store references to the previous and current slides
  2267. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  2268. // Show fragment, if specified
  2269. if( typeof f !== 'undefined' ) {
  2270. navigateFragment( f );
  2271. }
  2272. // Dispatch an event if the slide changed
  2273. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  2274. if (!slideChanged) {
  2275. // Ensure that the previous slide is never the same as the current
  2276. previousSlide = null;
  2277. }
  2278. // Solves an edge case where the previous slide maintains the
  2279. // 'present' class when navigating between adjacent vertical
  2280. // stacks
  2281. if( previousSlide && previousSlide !== currentSlide ) {
  2282. previousSlide.classList.remove( 'present' );
  2283. previousSlide.setAttribute( 'aria-hidden', 'true' );
  2284. // Reset all slides upon navigate to home
  2285. // Issue: #285
  2286. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  2287. // Launch async task
  2288. setTimeout( function () {
  2289. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  2290. for( i in slides ) {
  2291. if( slides[i] ) {
  2292. // Reset stack
  2293. setPreviousVerticalIndex( slides[i], 0 );
  2294. }
  2295. }
  2296. }, 0 );
  2297. }
  2298. }
  2299. // Apply the new state
  2300. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  2301. // Check if this state existed on the previous slide. If it
  2302. // did, we will avoid adding it repeatedly
  2303. for( var j = 0; j < stateBefore.length; j++ ) {
  2304. if( stateBefore[j] === state[i] ) {
  2305. stateBefore.splice( j, 1 );
  2306. continue stateLoop;
  2307. }
  2308. }
  2309. document.documentElement.classList.add( state[i] );
  2310. // Dispatch custom event matching the state's name
  2311. dispatchEvent( state[i] );
  2312. }
  2313. // Clean up the remains of the previous state
  2314. while( stateBefore.length ) {
  2315. document.documentElement.classList.remove( stateBefore.pop() );
  2316. }
  2317. if( slideChanged ) {
  2318. dispatchEvent( 'slidechanged', {
  2319. 'indexh': indexh,
  2320. 'indexv': indexv,
  2321. 'previousSlide': previousSlide,
  2322. 'currentSlide': currentSlide,
  2323. 'origin': o
  2324. } );
  2325. }
  2326. // Handle embedded content
  2327. if( slideChanged || !previousSlide ) {
  2328. stopEmbeddedContent( previousSlide );
  2329. startEmbeddedContent( currentSlide );
  2330. }
  2331. // Announce the current slide contents, for screen readers
  2332. dom.statusDiv.textContent = getStatusText( currentSlide );
  2333. updateControls();
  2334. updateProgress();
  2335. updateBackground();
  2336. updateParallax();
  2337. updateSlideNumber();
  2338. updateNotes();
  2339. updateFragments();
  2340. // Update the URL hash
  2341. writeURL();
  2342. cueAutoSlide();
  2343. }
  2344. /**
  2345. * Syncs the presentation with the current DOM. Useful
  2346. * when new slides or control elements are added or when
  2347. * the configuration has changed.
  2348. */
  2349. function sync() {
  2350. // Subscribe to input
  2351. removeEventListeners();
  2352. addEventListeners();
  2353. // Force a layout to make sure the current config is accounted for
  2354. layout();
  2355. // Reflect the current autoSlide value
  2356. autoSlide = config.autoSlide;
  2357. // Start auto-sliding if it's enabled
  2358. cueAutoSlide();
  2359. // Re-create the slide backgrounds
  2360. createBackgrounds();
  2361. // Write the current hash to the URL
  2362. writeURL();
  2363. sortAllFragments();
  2364. updateControls();
  2365. updateProgress();
  2366. updateSlideNumber();
  2367. updateSlidesVisibility();
  2368. updateBackground( true );
  2369. updateNotesVisibility();
  2370. updateNotes();
  2371. formatEmbeddedContent();
  2372. // Start or stop embedded content depending on global config
  2373. if( config.autoPlayMedia === false ) {
  2374. stopEmbeddedContent( currentSlide, { unloadIframes: false } );
  2375. }
  2376. else {
  2377. startEmbeddedContent( currentSlide );
  2378. }
  2379. if( isOverview() ) {
  2380. layoutOverview();
  2381. }
  2382. }
  2383. /**
  2384. * Updates reveal.js to keep in sync with new slide attributes. For
  2385. * example, if you add a new `data-background-image` you can call
  2386. * this to have reveal.js render the new background image.
  2387. *
  2388. * Similar to #sync() but more efficient when you only need to
  2389. * refresh a specific slide.
  2390. *
  2391. * @param {HTMLElement} slide
  2392. */
  2393. function syncSlide( slide ) {
  2394. // Default to the current slide
  2395. slide = slide || currentSlide;
  2396. syncBackground( slide );
  2397. syncFragments( slide );
  2398. loadSlide( slide );
  2399. updateBackground();
  2400. updateNotes();
  2401. }
  2402. /**
  2403. * Formats the fragments on the given slide so that they have
  2404. * valid indices. Call this if fragments are changed in the DOM
  2405. * after reveal.js has already initialized.
  2406. *
  2407. * @param {HTMLElement} slide
  2408. * @return {Array} a list of the HTML fragments that were synced
  2409. */
  2410. function syncFragments( slide ) {
  2411. // Default to the current slide
  2412. slide = slide || currentSlide;
  2413. return sortFragments( slide.querySelectorAll( '.fragment' ) );
  2414. }
  2415. /**
  2416. * Resets all vertical slides so that only the first
  2417. * is visible.
  2418. */
  2419. function resetVerticalSlides() {
  2420. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2421. horizontalSlides.forEach( function( horizontalSlide ) {
  2422. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2423. verticalSlides.forEach( function( verticalSlide, y ) {
  2424. if( y > 0 ) {
  2425. verticalSlide.classList.remove( 'present' );
  2426. verticalSlide.classList.remove( 'past' );
  2427. verticalSlide.classList.add( 'future' );
  2428. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  2429. }
  2430. } );
  2431. } );
  2432. }
  2433. /**
  2434. * Sorts and formats all of fragments in the
  2435. * presentation.
  2436. */
  2437. function sortAllFragments() {
  2438. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2439. horizontalSlides.forEach( function( horizontalSlide ) {
  2440. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2441. verticalSlides.forEach( function( verticalSlide, y ) {
  2442. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  2443. } );
  2444. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  2445. } );
  2446. }
  2447. /**
  2448. * Randomly shuffles all slides in the deck.
  2449. */
  2450. function shuffle() {
  2451. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2452. slides.forEach( function( slide ) {
  2453. // Insert this slide next to another random slide. This may
  2454. // cause the slide to insert before itself but that's fine.
  2455. dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
  2456. } );
  2457. }
  2458. /**
  2459. * Updates one dimension of slides by showing the slide
  2460. * with the specified index.
  2461. *
  2462. * @param {string} selector A CSS selector that will fetch
  2463. * the group of slides we are working with
  2464. * @param {number} index The index of the slide that should be
  2465. * shown
  2466. *
  2467. * @return {number} The index of the slide that is now shown,
  2468. * might differ from the passed in index if it was out of
  2469. * bounds.
  2470. */
  2471. function updateSlides( selector, index ) {
  2472. // Select all slides and convert the NodeList result to
  2473. // an array
  2474. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  2475. slidesLength = slides.length;
  2476. var printMode = isPrintingPDF();
  2477. if( slidesLength ) {
  2478. // Should the index loop?
  2479. if( config.loop ) {
  2480. index %= slidesLength;
  2481. if( index < 0 ) {
  2482. index = slidesLength + index;
  2483. }
  2484. }
  2485. // Enforce max and minimum index bounds
  2486. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  2487. for( var i = 0; i < slidesLength; i++ ) {
  2488. var element = slides[i];
  2489. var reverse = config.rtl && !isVerticalSlide( element );
  2490. element.classList.remove( 'past' );
  2491. element.classList.remove( 'present' );
  2492. element.classList.remove( 'future' );
  2493. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  2494. element.setAttribute( 'hidden', '' );
  2495. element.setAttribute( 'aria-hidden', 'true' );
  2496. // If this element contains vertical slides
  2497. if( element.querySelector( 'section' ) ) {
  2498. element.classList.add( 'stack' );
  2499. }
  2500. // If we're printing static slides, all slides are "present"
  2501. if( printMode ) {
  2502. element.classList.add( 'present' );
  2503. continue;
  2504. }
  2505. if( i < index ) {
  2506. // Any element previous to index is given the 'past' class
  2507. element.classList.add( reverse ? 'future' : 'past' );
  2508. if( config.fragments ) {
  2509. // Show all fragments in prior slides
  2510. toArray( element.querySelectorAll( '.fragment' ) ).forEach( function( fragment ) {
  2511. fragment.classList.add( 'visible' );
  2512. fragment.classList.remove( 'current-fragment' );
  2513. } );
  2514. }
  2515. }
  2516. else if( i > index ) {
  2517. // Any element subsequent to index is given the 'future' class
  2518. element.classList.add( reverse ? 'past' : 'future' );
  2519. if( config.fragments ) {
  2520. // Hide all fragments in future slides
  2521. toArray( element.querySelectorAll( '.fragment.visible' ) ).forEach( function( fragment ) {
  2522. fragment.classList.remove( 'visible' );
  2523. fragment.classList.remove( 'current-fragment' );
  2524. } );
  2525. }
  2526. }
  2527. }
  2528. // Mark the current slide as present
  2529. slides[index].classList.add( 'present' );
  2530. slides[index].removeAttribute( 'hidden' );
  2531. slides[index].removeAttribute( 'aria-hidden' );
  2532. // If this slide has a state associated with it, add it
  2533. // onto the current state of the deck
  2534. var slideState = slides[index].getAttribute( 'data-state' );
  2535. if( slideState ) {
  2536. state = state.concat( slideState.split( ' ' ) );
  2537. }
  2538. }
  2539. else {
  2540. // Since there are no slides we can't be anywhere beyond the
  2541. // zeroth index
  2542. index = 0;
  2543. }
  2544. return index;
  2545. }
  2546. /**
  2547. * Optimization method; hide all slides that are far away
  2548. * from the present slide.
  2549. */
  2550. function updateSlidesVisibility() {
  2551. // Select all slides and convert the NodeList result to
  2552. // an array
  2553. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  2554. horizontalSlidesLength = horizontalSlides.length,
  2555. distanceX,
  2556. distanceY;
  2557. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  2558. // The number of steps away from the present slide that will
  2559. // be visible
  2560. var viewDistance = isOverview() ? 10 : config.viewDistance;
  2561. // Shorten the view distance on devices that typically have
  2562. // less resources
  2563. if( isMobileDevice ) {
  2564. viewDistance = isOverview() ? 6 : config.mobileViewDistance;
  2565. }
  2566. // All slides need to be visible when exporting to PDF
  2567. if( isPrintingPDF() ) {
  2568. viewDistance = Number.MAX_VALUE;
  2569. }
  2570. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  2571. var horizontalSlide = horizontalSlides[x];
  2572. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  2573. verticalSlidesLength = verticalSlides.length;
  2574. // Determine how far away this slide is from the present
  2575. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  2576. // If the presentation is looped, distance should measure
  2577. // 1 between the first and last slides
  2578. if( config.loop ) {
  2579. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  2580. }
  2581. // Show the horizontal slide if it's within the view distance
  2582. if( distanceX < viewDistance ) {
  2583. loadSlide( horizontalSlide );
  2584. }
  2585. else {
  2586. unloadSlide( horizontalSlide );
  2587. }
  2588. if( verticalSlidesLength ) {
  2589. var oy = getPreviousVerticalIndex( horizontalSlide );
  2590. for( var y = 0; y < verticalSlidesLength; y++ ) {
  2591. var verticalSlide = verticalSlides[y];
  2592. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  2593. if( distanceX + distanceY < viewDistance ) {
  2594. loadSlide( verticalSlide );
  2595. }
  2596. else {
  2597. unloadSlide( verticalSlide );
  2598. }
  2599. }
  2600. }
  2601. }
  2602. // Flag if there are ANY vertical slides, anywhere in the deck
  2603. if( hasVerticalSlides() ) {
  2604. dom.wrapper.classList.add( 'has-vertical-slides' );
  2605. }
  2606. else {
  2607. dom.wrapper.classList.remove( 'has-vertical-slides' );
  2608. }
  2609. // Flag if there are ANY horizontal slides, anywhere in the deck
  2610. if( hasHorizontalSlides() ) {
  2611. dom.wrapper.classList.add( 'has-horizontal-slides' );
  2612. }
  2613. else {
  2614. dom.wrapper.classList.remove( 'has-horizontal-slides' );
  2615. }
  2616. }
  2617. }
  2618. /**
  2619. * Pick up notes from the current slide and display them
  2620. * to the viewer.
  2621. *
  2622. * @see {@link config.showNotes}
  2623. */
  2624. function updateNotes() {
  2625. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  2626. dom.speakerNotes.innerHTML = getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
  2627. }
  2628. }
  2629. /**
  2630. * Updates the visibility of the speaker notes sidebar that
  2631. * is used to share annotated slides. The notes sidebar is
  2632. * only visible if showNotes is true and there are notes on
  2633. * one or more slides in the deck.
  2634. */
  2635. function updateNotesVisibility() {
  2636. if( config.showNotes && hasNotes() ) {
  2637. dom.wrapper.classList.add( 'show-notes' );
  2638. }
  2639. else {
  2640. dom.wrapper.classList.remove( 'show-notes' );
  2641. }
  2642. }
  2643. /**
  2644. * Checks if there are speaker notes for ANY slide in the
  2645. * presentation.
  2646. */
  2647. function hasNotes() {
  2648. return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0;
  2649. }
  2650. /**
  2651. * Updates the progress bar to reflect the current slide.
  2652. */
  2653. function updateProgress() {
  2654. // Update progress if enabled
  2655. if( config.progress && dom.progressbar ) {
  2656. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  2657. }
  2658. }
  2659. /**
  2660. * Updates the slide number to match the current slide.
  2661. */
  2662. function updateSlideNumber() {
  2663. // Update slide number if enabled
  2664. if( config.slideNumber && dom.slideNumber ) {
  2665. var value;
  2666. var format = 'h.v';
  2667. if( typeof config.slideNumber === 'function' ) {
  2668. value = config.slideNumber();
  2669. }
  2670. else {
  2671. // Check if a custom number format is available
  2672. if( typeof config.slideNumber === 'string' ) {
  2673. format = config.slideNumber;
  2674. }
  2675. // If there are ONLY vertical slides in this deck, always use
  2676. // a flattened slide number
  2677. if( !/c/.test( format ) && dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length === 1 ) {
  2678. format = 'c';
  2679. }
  2680. value = [];
  2681. switch( format ) {
  2682. case 'c':
  2683. value.push( getSlidePastCount() + 1 );
  2684. break;
  2685. case 'c/t':
  2686. value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
  2687. break;
  2688. case 'h/v':
  2689. value.push( indexh + 1 );
  2690. if( isVerticalSlide() ) value.push( '/', indexv + 1 );
  2691. break;
  2692. default:
  2693. value.push( indexh + 1 );
  2694. if( isVerticalSlide() ) value.push( '.', indexv + 1 );
  2695. }
  2696. }
  2697. dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
  2698. }
  2699. }
  2700. /**
  2701. * Applies HTML formatting to a slide number before it's
  2702. * written to the DOM.
  2703. *
  2704. * @param {number} a Current slide
  2705. * @param {string} delimiter Character to separate slide numbers
  2706. * @param {(number|*)} b Total slides
  2707. * @return {string} HTML string fragment
  2708. */
  2709. function formatSlideNumber( a, delimiter, b ) {
  2710. var url = '#' + locationHash();
  2711. if( typeof b === 'number' && !isNaN( b ) ) {
  2712. return '<a href="' + url + '">' +
  2713. '<span class="slide-number-a">'+ a +'</span>' +
  2714. '<span class="slide-number-delimiter">'+ delimiter +'</span>' +
  2715. '<span class="slide-number-b">'+ b +'</span>' +
  2716. '</a>';
  2717. }
  2718. else {
  2719. return '<a href="' + url + '">' +
  2720. '<span class="slide-number-a">'+ a +'</span>' +
  2721. '</a>';
  2722. }
  2723. }
  2724. /**
  2725. * Updates the state of all control/navigation arrows.
  2726. */
  2727. function updateControls() {
  2728. var routes = availableRoutes();
  2729. var fragments = availableFragments();
  2730. // Remove the 'enabled' class from all directions
  2731. dom.controlsLeft.concat( dom.controlsRight )
  2732. .concat( dom.controlsUp )
  2733. .concat( dom.controlsDown )
  2734. .concat( dom.controlsPrev )
  2735. .concat( dom.controlsNext ).forEach( function( node ) {
  2736. node.classList.remove( 'enabled' );
  2737. node.classList.remove( 'fragmented' );
  2738. // Set 'disabled' attribute on all directions
  2739. node.setAttribute( 'disabled', 'disabled' );
  2740. } );
  2741. // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
  2742. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2743. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2744. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2745. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2746. // Prev/next buttons
  2747. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2748. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2749. // Highlight fragment directions
  2750. if( currentSlide ) {
  2751. // Always apply fragment decorator to prev/next buttons
  2752. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2753. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2754. // Apply fragment decorators to directional buttons based on
  2755. // what slide axis they are in
  2756. if( isVerticalSlide( currentSlide ) ) {
  2757. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2758. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2759. }
  2760. else {
  2761. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2762. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2763. }
  2764. }
  2765. if( config.controlsTutorial ) {
  2766. // Highlight control arrows with an animation to ensure
  2767. // that the viewer knows how to navigate
  2768. if( !hasNavigatedDown && routes.down ) {
  2769. dom.controlsDownArrow.classList.add( 'highlight' );
  2770. }
  2771. else {
  2772. dom.controlsDownArrow.classList.remove( 'highlight' );
  2773. if( !hasNavigatedRight && routes.right && indexv === 0 ) {
  2774. dom.controlsRightArrow.classList.add( 'highlight' );
  2775. }
  2776. else {
  2777. dom.controlsRightArrow.classList.remove( 'highlight' );
  2778. }
  2779. }
  2780. }
  2781. }
  2782. /**
  2783. * Updates the background elements to reflect the current
  2784. * slide.
  2785. *
  2786. * @param {boolean} includeAll If true, the backgrounds of
  2787. * all vertical slides (not just the present) will be updated.
  2788. */
  2789. function updateBackground( includeAll ) {
  2790. var currentBackground = null;
  2791. // Reverse past/future classes when in RTL mode
  2792. var horizontalPast = config.rtl ? 'future' : 'past',
  2793. horizontalFuture = config.rtl ? 'past' : 'future';
  2794. // Update the classes of all backgrounds to match the
  2795. // states of their slides (past/present/future)
  2796. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2797. backgroundh.classList.remove( 'past' );
  2798. backgroundh.classList.remove( 'present' );
  2799. backgroundh.classList.remove( 'future' );
  2800. if( h < indexh ) {
  2801. backgroundh.classList.add( horizontalPast );
  2802. }
  2803. else if ( h > indexh ) {
  2804. backgroundh.classList.add( horizontalFuture );
  2805. }
  2806. else {
  2807. backgroundh.classList.add( 'present' );
  2808. // Store a reference to the current background element
  2809. currentBackground = backgroundh;
  2810. }
  2811. if( includeAll || h === indexh ) {
  2812. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2813. backgroundv.classList.remove( 'past' );
  2814. backgroundv.classList.remove( 'present' );
  2815. backgroundv.classList.remove( 'future' );
  2816. if( v < indexv ) {
  2817. backgroundv.classList.add( 'past' );
  2818. }
  2819. else if ( v > indexv ) {
  2820. backgroundv.classList.add( 'future' );
  2821. }
  2822. else {
  2823. backgroundv.classList.add( 'present' );
  2824. // Only if this is the present horizontal and vertical slide
  2825. if( h === indexh ) currentBackground = backgroundv;
  2826. }
  2827. } );
  2828. }
  2829. } );
  2830. // Stop content inside of previous backgrounds
  2831. if( previousBackground ) {
  2832. stopEmbeddedContent( previousBackground, { unloadIframes: !shouldPreload( previousBackground ) } );
  2833. }
  2834. // Start content in the current background
  2835. if( currentBackground ) {
  2836. startEmbeddedContent( currentBackground );
  2837. var currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
  2838. if( currentBackgroundContent ) {
  2839. var backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';
  2840. // Restart GIFs (doesn't work in Firefox)
  2841. if( /\.gif/i.test( backgroundImageURL ) ) {
  2842. currentBackgroundContent.style.backgroundImage = '';
  2843. window.getComputedStyle( currentBackgroundContent ).opacity;
  2844. currentBackgroundContent.style.backgroundImage = backgroundImageURL;
  2845. }
  2846. }
  2847. // Don't transition between identical backgrounds. This
  2848. // prevents unwanted flicker.
  2849. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2850. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2851. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2852. dom.background.classList.add( 'no-transition' );
  2853. }
  2854. previousBackground = currentBackground;
  2855. }
  2856. // If there's a background brightness flag for this slide,
  2857. // bubble it to the .reveal container
  2858. if( currentSlide ) {
  2859. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2860. if( currentSlide.classList.contains( classToBubble ) ) {
  2861. dom.wrapper.classList.add( classToBubble );
  2862. }
  2863. else {
  2864. dom.wrapper.classList.remove( classToBubble );
  2865. }
  2866. } );
  2867. }
  2868. // Allow the first background to apply without transition
  2869. setTimeout( function() {
  2870. dom.background.classList.remove( 'no-transition' );
  2871. }, 1 );
  2872. }
  2873. /**
  2874. * Updates the position of the parallax background based
  2875. * on the current slide index.
  2876. */
  2877. function updateParallax() {
  2878. if( config.parallaxBackgroundImage ) {
  2879. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2880. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2881. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2882. backgroundWidth, backgroundHeight;
  2883. if( backgroundSize.length === 1 ) {
  2884. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2885. }
  2886. else {
  2887. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2888. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2889. }
  2890. var slideWidth = dom.background.offsetWidth,
  2891. horizontalSlideCount = horizontalSlides.length,
  2892. horizontalOffsetMultiplier,
  2893. horizontalOffset;
  2894. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2895. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2896. }
  2897. else {
  2898. horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
  2899. }
  2900. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2901. var slideHeight = dom.background.offsetHeight,
  2902. verticalSlideCount = verticalSlides.length,
  2903. verticalOffsetMultiplier,
  2904. verticalOffset;
  2905. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2906. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2907. }
  2908. else {
  2909. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2910. }
  2911. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0;
  2912. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2913. }
  2914. }
  2915. /**
  2916. * Should the given element be preloaded?
  2917. * Decides based on local element attributes and global config.
  2918. *
  2919. * @param {HTMLElement} element
  2920. */
  2921. function shouldPreload( element ) {
  2922. // Prefer an explicit global preload setting
  2923. var preload = config.preloadIframes;
  2924. // If no global setting is available, fall back on the element's
  2925. // own preload setting
  2926. if( typeof preload !== 'boolean' ) {
  2927. preload = element.hasAttribute( 'data-preload' );
  2928. }
  2929. return preload;
  2930. }
  2931. /**
  2932. * Called when the given slide is within the configured view
  2933. * distance. Shows the slide element and loads any content
  2934. * that is set to load lazily (data-src).
  2935. *
  2936. * @param {HTMLElement} slide Slide to show
  2937. */
  2938. function loadSlide( slide, options ) {
  2939. options = options || {};
  2940. // Show the slide element
  2941. slide.style.display = config.display;
  2942. // Media elements with data-src attributes
  2943. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  2944. if( element.tagName !== 'IFRAME' || shouldPreload( element ) ) {
  2945. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2946. element.setAttribute( 'data-lazy-loaded', '' );
  2947. element.removeAttribute( 'data-src' );
  2948. }
  2949. } );
  2950. // Media elements with <source> children
  2951. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2952. var sources = 0;
  2953. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2954. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2955. source.removeAttribute( 'data-src' );
  2956. source.setAttribute( 'data-lazy-loaded', '' );
  2957. sources += 1;
  2958. } );
  2959. // If we rewrote sources for this video/audio element, we need
  2960. // to manually tell it to load from its new origin
  2961. if( sources > 0 ) {
  2962. media.load();
  2963. }
  2964. } );
  2965. // Show the corresponding background element
  2966. var background = slide.slideBackgroundElement;
  2967. if( background ) {
  2968. background.style.display = 'block';
  2969. var backgroundContent = slide.slideBackgroundContentElement;
  2970. var backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2971. // If the background contains media, load it
  2972. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2973. background.setAttribute( 'data-loaded', 'true' );
  2974. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2975. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2976. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2977. backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' );
  2978. // Images
  2979. if( backgroundImage ) {
  2980. backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')';
  2981. }
  2982. // Videos
  2983. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2984. var video = document.createElement( 'video' );
  2985. if( backgroundVideoLoop ) {
  2986. video.setAttribute( 'loop', '' );
  2987. }
  2988. if( backgroundVideoMuted ) {
  2989. video.muted = true;
  2990. }
  2991. // Inline video playback works (at least in Mobile Safari) as
  2992. // long as the video is muted and the `playsinline` attribute is
  2993. // present
  2994. if( isMobileDevice ) {
  2995. video.muted = true;
  2996. video.autoplay = true;
  2997. video.setAttribute( 'playsinline', '' );
  2998. }
  2999. // Support comma separated lists of video sources
  3000. backgroundVideo.split( ',' ).forEach( function( source ) {
  3001. video.innerHTML += '<source src="'+ source +'">';
  3002. } );
  3003. backgroundContent.appendChild( video );
  3004. }
  3005. // Iframes
  3006. else if( backgroundIframe && options.excludeIframes !== true ) {
  3007. var iframe = document.createElement( 'iframe' );
  3008. iframe.setAttribute( 'allowfullscreen', '' );
  3009. iframe.setAttribute( 'mozallowfullscreen', '' );
  3010. iframe.setAttribute( 'webkitallowfullscreen', '' );
  3011. iframe.setAttribute( 'allow', 'autoplay' );
  3012. iframe.setAttribute( 'data-src', backgroundIframe );
  3013. iframe.style.width = '100%';
  3014. iframe.style.height = '100%';
  3015. iframe.style.maxHeight = '100%';
  3016. iframe.style.maxWidth = '100%';
  3017. backgroundContent.appendChild( iframe );
  3018. }
  3019. }
  3020. // Start loading preloadable iframes
  3021. var backgroundIframeElement = backgroundContent.querySelector( 'iframe[data-src]' );
  3022. if( backgroundIframeElement ) {
  3023. // Check if this iframe is eligible to be preloaded
  3024. if( shouldPreload( background ) && !/autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
  3025. if( backgroundIframeElement.getAttribute( 'src' ) !== backgroundIframe ) {
  3026. backgroundIframeElement.setAttribute( 'src', backgroundIframe );
  3027. }
  3028. }
  3029. }
  3030. }
  3031. }
  3032. /**
  3033. * Unloads and hides the given slide. This is called when the
  3034. * slide is moved outside of the configured view distance.
  3035. *
  3036. * @param {HTMLElement} slide
  3037. */
  3038. function unloadSlide( slide ) {
  3039. // Hide the slide element
  3040. slide.style.display = 'none';
  3041. // Hide the corresponding background element
  3042. var background = getSlideBackground( slide );
  3043. if( background ) {
  3044. background.style.display = 'none';
  3045. // Unload any background iframes
  3046. toArray( background.querySelectorAll( 'iframe[src]' ) ).forEach( function( element ) {
  3047. element.removeAttribute( 'src' );
  3048. } );
  3049. }
  3050. // Reset lazy-loaded media elements with src attributes
  3051. toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ) ).forEach( function( element ) {
  3052. element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
  3053. element.removeAttribute( 'src' );
  3054. } );
  3055. // Reset lazy-loaded media elements with <source> children
  3056. toArray( slide.querySelectorAll( 'video[data-lazy-loaded] source[src], audio source[src]' ) ).forEach( function( source ) {
  3057. source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
  3058. source.removeAttribute( 'src' );
  3059. } );
  3060. }
  3061. /**
  3062. * Determine what available routes there are for navigation.
  3063. *
  3064. * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
  3065. */
  3066. function availableRoutes() {
  3067. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  3068. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  3069. var routes = {
  3070. left: indexh > 0,
  3071. right: indexh < horizontalSlides.length - 1,
  3072. up: indexv > 0,
  3073. down: indexv < verticalSlides.length - 1
  3074. };
  3075. // Looped presentations can always be navigated as long as
  3076. // there are slides available
  3077. if( config.loop ) {
  3078. if( horizontalSlides.length > 1 ) {
  3079. routes.left = true;
  3080. routes.right = true;
  3081. }
  3082. if( verticalSlides.length > 1 ) {
  3083. routes.up = true;
  3084. routes.down = true;
  3085. }
  3086. }
  3087. // Reverse horizontal controls for rtl
  3088. if( config.rtl ) {
  3089. var left = routes.left;
  3090. routes.left = routes.right;
  3091. routes.right = left;
  3092. }
  3093. return routes;
  3094. }
  3095. /**
  3096. * Returns an object describing the available fragment
  3097. * directions.
  3098. *
  3099. * @return {{prev: boolean, next: boolean}}
  3100. */
  3101. function availableFragments() {
  3102. if( currentSlide && config.fragments ) {
  3103. var fragments = currentSlide.querySelectorAll( '.fragment' );
  3104. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  3105. return {
  3106. prev: fragments.length - hiddenFragments.length > 0,
  3107. next: !!hiddenFragments.length
  3108. };
  3109. }
  3110. else {
  3111. return { prev: false, next: false };
  3112. }
  3113. }
  3114. /**
  3115. * Enforces origin-specific format rules for embedded media.
  3116. */
  3117. function formatEmbeddedContent() {
  3118. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  3119. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  3120. var src = el.getAttribute( sourceAttribute );
  3121. if( src && src.indexOf( param ) === -1 ) {
  3122. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  3123. }
  3124. });
  3125. };
  3126. // YouTube frames must include "?enablejsapi=1"
  3127. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  3128. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  3129. // Vimeo frames must include "?api=1"
  3130. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  3131. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  3132. }
  3133. /**
  3134. * Start playback of any embedded content inside of
  3135. * the given element.
  3136. *
  3137. * @param {HTMLElement} element
  3138. */
  3139. function startEmbeddedContent( element ) {
  3140. if( element && !isSpeakerNotes() ) {
  3141. // Restart GIFs
  3142. toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  3143. // Setting the same unchanged source like this was confirmed
  3144. // to work in Chrome, FF & Safari
  3145. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  3146. } );
  3147. // HTML5 media elements
  3148. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3149. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3150. return;
  3151. }
  3152. // Prefer an explicit global autoplay setting
  3153. var autoplay = config.autoPlayMedia;
  3154. // If no global setting is available, fall back on the element's
  3155. // own autoplay setting
  3156. if( typeof autoplay !== 'boolean' ) {
  3157. autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
  3158. }
  3159. if( autoplay && typeof el.play === 'function' ) {
  3160. // If the media is ready, start playback
  3161. if( el.readyState > 1 ) {
  3162. startEmbeddedMedia( { target: el } );
  3163. }
  3164. // Mobile devices never fire a loaded event so instead
  3165. // of waiting, we initiate playback
  3166. else if( isMobileDevice ) {
  3167. var promise = el.play();
  3168. // If autoplay does not work, ensure that the controls are visible so
  3169. // that the viewer can start the media on their own
  3170. if( promise && typeof promise.catch === 'function' && el.controls === false ) {
  3171. promise.catch( function() {
  3172. el.controls = true;
  3173. // Once the video does start playing, hide the controls again
  3174. el.addEventListener( 'play', function() {
  3175. el.controls = false;
  3176. } );
  3177. } );
  3178. }
  3179. }
  3180. // If the media isn't loaded, wait before playing
  3181. else {
  3182. el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes
  3183. el.addEventListener( 'loadeddata', startEmbeddedMedia );
  3184. }
  3185. }
  3186. } );
  3187. // Normal iframes
  3188. toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  3189. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3190. return;
  3191. }
  3192. startEmbeddedIframe( { target: el } );
  3193. } );
  3194. // Lazy loading iframes
  3195. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3196. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3197. return;
  3198. }
  3199. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  3200. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  3201. el.addEventListener( 'load', startEmbeddedIframe );
  3202. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  3203. }
  3204. } );
  3205. }
  3206. }
  3207. /**
  3208. * Starts playing an embedded video/audio element after
  3209. * it has finished loading.
  3210. *
  3211. * @param {object} event
  3212. */
  3213. function startEmbeddedMedia( event ) {
  3214. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3215. isVisible = !!closestParent( event.target, '.present' );
  3216. if( isAttachedToDOM && isVisible ) {
  3217. event.target.currentTime = 0;
  3218. event.target.play();
  3219. }
  3220. event.target.removeEventListener( 'loadeddata', startEmbeddedMedia );
  3221. }
  3222. /**
  3223. * "Starts" the content of an embedded iframe using the
  3224. * postMessage API.
  3225. *
  3226. * @param {object} event
  3227. */
  3228. function startEmbeddedIframe( event ) {
  3229. var iframe = event.target;
  3230. if( iframe && iframe.contentWindow ) {
  3231. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3232. isVisible = !!closestParent( event.target, '.present' );
  3233. if( isAttachedToDOM && isVisible ) {
  3234. // Prefer an explicit global autoplay setting
  3235. var autoplay = config.autoPlayMedia;
  3236. // If no global setting is available, fall back on the element's
  3237. // own autoplay setting
  3238. if( typeof autoplay !== 'boolean' ) {
  3239. autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
  3240. }
  3241. // YouTube postMessage API
  3242. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3243. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  3244. }
  3245. // Vimeo postMessage API
  3246. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3247. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  3248. }
  3249. // Generic postMessage API
  3250. else {
  3251. iframe.contentWindow.postMessage( 'slide:start', '*' );
  3252. }
  3253. }
  3254. }
  3255. }
  3256. /**
  3257. * Stop playback of any embedded content inside of
  3258. * the targeted slide.
  3259. *
  3260. * @param {HTMLElement} element
  3261. */
  3262. function stopEmbeddedContent( element, options ) {
  3263. options = extend( {
  3264. // Defaults
  3265. unloadIframes: true
  3266. }, options || {} );
  3267. if( element && element.parentNode ) {
  3268. // HTML5 media elements
  3269. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3270. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  3271. el.setAttribute('data-paused-by-reveal', '');
  3272. el.pause();
  3273. }
  3274. } );
  3275. // Generic postMessage API for non-lazy loaded iframes
  3276. toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  3277. if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
  3278. el.removeEventListener( 'load', startEmbeddedIframe );
  3279. });
  3280. // YouTube postMessage API
  3281. toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  3282. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3283. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  3284. }
  3285. });
  3286. // Vimeo postMessage API
  3287. toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  3288. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3289. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  3290. }
  3291. });
  3292. if( options.unloadIframes === true ) {
  3293. // Unload lazy-loaded iframes
  3294. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3295. // Only removing the src doesn't actually unload the frame
  3296. // in all browsers (Firefox) so we set it to blank first
  3297. el.setAttribute( 'src', 'about:blank' );
  3298. el.removeAttribute( 'src' );
  3299. } );
  3300. }
  3301. }
  3302. }
  3303. /**
  3304. * Returns the number of past slides. This can be used as a global
  3305. * flattened index for slides.
  3306. *
  3307. * @return {number} Past slide count
  3308. */
  3309. function getSlidePastCount() {
  3310. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3311. // The number of past slides
  3312. var pastCount = 0;
  3313. // Step through all slides and count the past ones
  3314. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  3315. var horizontalSlide = horizontalSlides[i];
  3316. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  3317. for( var j = 0; j < verticalSlides.length; j++ ) {
  3318. // Stop as soon as we arrive at the present
  3319. if( verticalSlides[j].classList.contains( 'present' ) ) {
  3320. break mainLoop;
  3321. }
  3322. pastCount++;
  3323. }
  3324. // Stop as soon as we arrive at the present
  3325. if( horizontalSlide.classList.contains( 'present' ) ) {
  3326. break;
  3327. }
  3328. // Don't count the wrapping section for vertical slides
  3329. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  3330. pastCount++;
  3331. }
  3332. }
  3333. return pastCount;
  3334. }
  3335. /**
  3336. * Returns a value ranging from 0-1 that represents
  3337. * how far into the presentation we have navigated.
  3338. *
  3339. * @return {number}
  3340. */
  3341. function getProgress() {
  3342. // The number of past and total slides
  3343. var totalCount = getTotalSlides();
  3344. var pastCount = getSlidePastCount();
  3345. if( currentSlide ) {
  3346. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  3347. // If there are fragments in the current slide those should be
  3348. // accounted for in the progress.
  3349. if( allFragments.length > 0 ) {
  3350. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  3351. // This value represents how big a portion of the slide progress
  3352. // that is made up by its fragments (0-1)
  3353. var fragmentWeight = 0.9;
  3354. // Add fragment progress to the past slide count
  3355. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  3356. }
  3357. }
  3358. return Math.min( pastCount / ( totalCount - 1 ), 1 );
  3359. }
  3360. /**
  3361. * Checks if this presentation is running inside of the
  3362. * speaker notes window.
  3363. *
  3364. * @return {boolean}
  3365. */
  3366. function isSpeakerNotes() {
  3367. return !!window.location.search.match( /receiver/gi );
  3368. }
  3369. /**
  3370. * Reads the current URL (hash) and navigates accordingly.
  3371. */
  3372. function readURL() {
  3373. var hash = window.location.hash;
  3374. // Attempt to parse the hash as either an index or name
  3375. var bits = hash.slice( 2 ).split( '/' ),
  3376. name = hash.replace( /#|\//gi, '' );
  3377. // If the first bit is not fully numeric and there is a name we
  3378. // can assume that this is a named link
  3379. if( !/^[0-9]*$/.test( bits[0] ) && name.length ) {
  3380. var element;
  3381. // Ensure the named link is a valid HTML ID attribute
  3382. try {
  3383. element = document.getElementById( decodeURIComponent( name ) );
  3384. }
  3385. catch ( error ) { }
  3386. // Ensure that we're not already on a slide with the same name
  3387. var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
  3388. if( element ) {
  3389. // If the slide exists and is not the current slide...
  3390. if ( !isSameNameAsCurrentSlide ) {
  3391. // ...find the position of the named slide and navigate to it
  3392. var indices = Reveal.getIndices(element);
  3393. slide(indices.h, indices.v);
  3394. }
  3395. }
  3396. // If the slide doesn't exist, navigate to the current slide
  3397. else {
  3398. slide( indexh || 0, indexv || 0 );
  3399. }
  3400. }
  3401. else {
  3402. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  3403. // Read the index components of the hash
  3404. var h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,
  3405. v = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,
  3406. f;
  3407. if( config.fragmentInURL ) {
  3408. f = parseInt( bits[2], 10 );
  3409. if( isNaN( f ) ) {
  3410. f = undefined;
  3411. }
  3412. }
  3413. if( h !== indexh || v !== indexv || f !== undefined ) {
  3414. slide( h, v, f );
  3415. }
  3416. }
  3417. }
  3418. /**
  3419. * Updates the page URL (hash) to reflect the current
  3420. * state.
  3421. *
  3422. * @param {number} delay The time in ms to wait before
  3423. * writing the hash
  3424. */
  3425. function writeURL( delay ) {
  3426. // Make sure there's never more than one timeout running
  3427. clearTimeout( writeURLTimeout );
  3428. // If a delay is specified, timeout this call
  3429. if( typeof delay === 'number' ) {
  3430. writeURLTimeout = setTimeout( writeURL, delay );
  3431. }
  3432. else if( currentSlide ) {
  3433. // If we're configured to push to history OR the history
  3434. // API is not avaialble.
  3435. if( config.history || !window.history ) {
  3436. window.location.hash = locationHash();
  3437. }
  3438. // If we're configured to reflect the current slide in the
  3439. // URL without pushing to history.
  3440. else if( config.hash ) {
  3441. window.history.replaceState( null, null, '#' + locationHash() );
  3442. }
  3443. // If history and hash are both disabled, a hash may still
  3444. // be added to the URL by clicking on a href with a hash
  3445. // target. Counter this by always removing the hash.
  3446. else {
  3447. window.history.replaceState( null, null, window.location.pathname + window.location.search );
  3448. }
  3449. }
  3450. }
  3451. /**
  3452. * Retrieves the h/v location and fragment of the current,
  3453. * or specified, slide.
  3454. *
  3455. * @param {HTMLElement} [slide] If specified, the returned
  3456. * index will be for this slide rather than the currently
  3457. * active one
  3458. *
  3459. * @return {{h: number, v: number, f: number}}
  3460. */
  3461. function getIndices( slide ) {
  3462. // By default, return the current indices
  3463. var h = indexh,
  3464. v = indexv,
  3465. f;
  3466. // If a slide is specified, return the indices of that slide
  3467. if( slide ) {
  3468. var isVertical = isVerticalSlide( slide );
  3469. var slideh = isVertical ? slide.parentNode : slide;
  3470. // Select all horizontal slides
  3471. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3472. // Now that we know which the horizontal slide is, get its index
  3473. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  3474. // Assume we're not vertical
  3475. v = undefined;
  3476. // If this is a vertical slide, grab the vertical index
  3477. if( isVertical ) {
  3478. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  3479. }
  3480. }
  3481. if( !slide && currentSlide ) {
  3482. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  3483. if( hasFragments ) {
  3484. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  3485. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  3486. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  3487. }
  3488. else {
  3489. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  3490. }
  3491. }
  3492. }
  3493. return { h: h, v: v, f: f };
  3494. }
  3495. /**
  3496. * Retrieves all slides in this presentation.
  3497. */
  3498. function getSlides() {
  3499. return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ) );
  3500. }
  3501. /**
  3502. * Returns a list of all horizontal slides in the deck. Each
  3503. * vertical stack is included as one horizontal slide in the
  3504. * resulting array.
  3505. */
  3506. function getHorizontalSlides() {
  3507. return toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3508. }
  3509. /**
  3510. * Returns all vertical slides that exist within this deck.
  3511. */
  3512. function getVerticalSlides() {
  3513. return toArray( dom.wrapper.querySelectorAll( '.slides>section>section' ) );
  3514. }
  3515. /**
  3516. * Returns true if there are at least two horizontal slides.
  3517. */
  3518. function hasHorizontalSlides() {
  3519. return getHorizontalSlides().length > 1;
  3520. }
  3521. /**
  3522. * Returns true if there are at least two vertical slides.
  3523. */
  3524. function hasVerticalSlides() {
  3525. return getVerticalSlides().length > 1;
  3526. }
  3527. /**
  3528. * Returns an array of objects where each object represents the
  3529. * attributes on its respective slide.
  3530. */
  3531. function getSlidesAttributes() {
  3532. return getSlides().map( function( slide ) {
  3533. var attributes = {};
  3534. for( var i = 0; i < slide.attributes.length; i++ ) {
  3535. var attribute = slide.attributes[ i ];
  3536. attributes[ attribute.name ] = attribute.value;
  3537. }
  3538. return attributes;
  3539. } );
  3540. }
  3541. /**
  3542. * Retrieves the total number of slides in this presentation.
  3543. *
  3544. * @return {number}
  3545. */
  3546. function getTotalSlides() {
  3547. return getSlides().length;
  3548. }
  3549. /**
  3550. * Returns the slide element matching the specified index.
  3551. *
  3552. * @return {HTMLElement}
  3553. */
  3554. function getSlide( x, y ) {
  3555. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  3556. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  3557. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  3558. return verticalSlides ? verticalSlides[ y ] : undefined;
  3559. }
  3560. return horizontalSlide;
  3561. }
  3562. /**
  3563. * Returns the background element for the given slide.
  3564. * All slides, even the ones with no background properties
  3565. * defined, have a background element so as long as the
  3566. * index is valid an element will be returned.
  3567. *
  3568. * @param {mixed} x Horizontal background index OR a slide
  3569. * HTML element
  3570. * @param {number} y Vertical background index
  3571. * @return {(HTMLElement[]|*)}
  3572. */
  3573. function getSlideBackground( x, y ) {
  3574. var slide = typeof x === 'number' ? getSlide( x, y ) : x;
  3575. if( slide ) {
  3576. return slide.slideBackgroundElement;
  3577. }
  3578. return undefined;
  3579. }
  3580. /**
  3581. * Retrieves the speaker notes from a slide. Notes can be
  3582. * defined in two ways:
  3583. * 1. As a data-notes attribute on the slide <section>
  3584. * 2. As an <aside class="notes"> inside of the slide
  3585. *
  3586. * @param {HTMLElement} [slide=currentSlide]
  3587. * @return {(string|null)}
  3588. */
  3589. function getSlideNotes( slide ) {
  3590. // Default to the current slide
  3591. slide = slide || currentSlide;
  3592. // Notes can be specified via the data-notes attribute...
  3593. if( slide.hasAttribute( 'data-notes' ) ) {
  3594. return slide.getAttribute( 'data-notes' );
  3595. }
  3596. // ... or using an <aside class="notes"> element
  3597. var notesElement = slide.querySelector( 'aside.notes' );
  3598. if( notesElement ) {
  3599. return notesElement.innerHTML;
  3600. }
  3601. return null;
  3602. }
  3603. /**
  3604. * Retrieves the current state of the presentation as
  3605. * an object. This state can then be restored at any
  3606. * time.
  3607. *
  3608. * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
  3609. */
  3610. function getState() {
  3611. var indices = getIndices();
  3612. return {
  3613. indexh: indices.h,
  3614. indexv: indices.v,
  3615. indexf: indices.f,
  3616. paused: isPaused(),
  3617. overview: isOverview()
  3618. };
  3619. }
  3620. /**
  3621. * Restores the presentation to the given state.
  3622. *
  3623. * @param {object} state As generated by getState()
  3624. * @see {@link getState} generates the parameter `state`
  3625. */
  3626. function setState( state ) {
  3627. if( typeof state === 'object' ) {
  3628. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  3629. var pausedFlag = deserialize( state.paused ),
  3630. overviewFlag = deserialize( state.overview );
  3631. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  3632. togglePause( pausedFlag );
  3633. }
  3634. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  3635. toggleOverview( overviewFlag );
  3636. }
  3637. }
  3638. }
  3639. /**
  3640. * Return a sorted fragments list, ordered by an increasing
  3641. * "data-fragment-index" attribute.
  3642. *
  3643. * Fragments will be revealed in the order that they are returned by
  3644. * this function, so you can use the index attributes to control the
  3645. * order of fragment appearance.
  3646. *
  3647. * To maintain a sensible default fragment order, fragments are presumed
  3648. * to be passed in document order. This function adds a "fragment-index"
  3649. * attribute to each node if such an attribute is not already present,
  3650. * and sets that attribute to an integer value which is the position of
  3651. * the fragment within the fragments list.
  3652. *
  3653. * @param {object[]|*} fragments
  3654. * @param {boolean} grouped If true the returned array will contain
  3655. * nested arrays for all fragments with the same index
  3656. * @return {object[]} sorted Sorted array of fragments
  3657. */
  3658. function sortFragments( fragments, grouped ) {
  3659. fragments = toArray( fragments );
  3660. var ordered = [],
  3661. unordered = [],
  3662. sorted = [];
  3663. // Group ordered and unordered elements
  3664. fragments.forEach( function( fragment, i ) {
  3665. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  3666. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  3667. if( !ordered[index] ) {
  3668. ordered[index] = [];
  3669. }
  3670. ordered[index].push( fragment );
  3671. }
  3672. else {
  3673. unordered.push( [ fragment ] );
  3674. }
  3675. } );
  3676. // Append fragments without explicit indices in their
  3677. // DOM order
  3678. ordered = ordered.concat( unordered );
  3679. // Manually count the index up per group to ensure there
  3680. // are no gaps
  3681. var index = 0;
  3682. // Push all fragments in their sorted order to an array,
  3683. // this flattens the groups
  3684. ordered.forEach( function( group ) {
  3685. group.forEach( function( fragment ) {
  3686. sorted.push( fragment );
  3687. fragment.setAttribute( 'data-fragment-index', index );
  3688. } );
  3689. index ++;
  3690. } );
  3691. return grouped === true ? ordered : sorted;
  3692. }
  3693. /**
  3694. * Refreshes the fragments on the current slide so that they
  3695. * have the appropriate classes (.visible + .current-fragment).
  3696. *
  3697. * @param {number} [index] The index of the current fragment
  3698. * @param {array} [fragments] Array containing all fragments
  3699. * in the current slide
  3700. *
  3701. * @return {{shown: array, hidden: array}}
  3702. */
  3703. function updateFragments( index, fragments ) {
  3704. var changedFragments = {
  3705. shown: [],
  3706. hidden: []
  3707. };
  3708. if( currentSlide && config.fragments ) {
  3709. fragments = fragments || sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3710. if( fragments.length ) {
  3711. if( typeof index !== 'number' ) {
  3712. var currentFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3713. if( currentFragment ) {
  3714. index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3715. }
  3716. }
  3717. toArray( fragments ).forEach( function( el, i ) {
  3718. if( el.hasAttribute( 'data-fragment-index' ) ) {
  3719. i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
  3720. }
  3721. // Visible fragments
  3722. if( i <= index ) {
  3723. if( !el.classList.contains( 'visible' ) ) changedFragments.shown.push( el );
  3724. el.classList.add( 'visible' );
  3725. el.classList.remove( 'current-fragment' );
  3726. // Announce the fragments one by one to the Screen Reader
  3727. dom.statusDiv.textContent = getStatusText( el );
  3728. if( i === index ) {
  3729. el.classList.add( 'current-fragment' );
  3730. startEmbeddedContent( el );
  3731. }
  3732. }
  3733. // Hidden fragments
  3734. else {
  3735. if( el.classList.contains( 'visible' ) ) changedFragments.hidden.push( el );
  3736. el.classList.remove( 'visible' );
  3737. el.classList.remove( 'current-fragment' );
  3738. }
  3739. } );
  3740. }
  3741. }
  3742. return changedFragments;
  3743. }
  3744. /**
  3745. * Navigate to the specified slide fragment.
  3746. *
  3747. * @param {?number} index The index of the fragment that
  3748. * should be shown, -1 means all are invisible
  3749. * @param {number} offset Integer offset to apply to the
  3750. * fragment index
  3751. *
  3752. * @return {boolean} true if a change was made in any
  3753. * fragments visibility as part of this call
  3754. */
  3755. function navigateFragment( index, offset ) {
  3756. if( currentSlide && config.fragments ) {
  3757. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3758. if( fragments.length ) {
  3759. // If no index is specified, find the current
  3760. if( typeof index !== 'number' ) {
  3761. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3762. if( lastVisibleFragment ) {
  3763. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3764. }
  3765. else {
  3766. index = -1;
  3767. }
  3768. }
  3769. // If an offset is specified, apply it to the index
  3770. if( typeof offset === 'number' ) {
  3771. index += offset;
  3772. }
  3773. var changedFragments = updateFragments( index, fragments );
  3774. if( changedFragments.hidden.length ) {
  3775. dispatchEvent( 'fragmenthidden', { fragment: changedFragments.hidden[0], fragments: changedFragments.hidden } );
  3776. }
  3777. if( changedFragments.shown.length ) {
  3778. dispatchEvent( 'fragmentshown', { fragment: changedFragments.shown[0], fragments: changedFragments.shown } );
  3779. }
  3780. updateControls();
  3781. updateProgress();
  3782. if( config.fragmentInURL ) {
  3783. writeURL();
  3784. }
  3785. return !!( changedFragments.shown.length || changedFragments.hidden.length );
  3786. }
  3787. }
  3788. return false;
  3789. }
  3790. /**
  3791. * Navigate to the next slide fragment.
  3792. *
  3793. * @return {boolean} true if there was a next fragment,
  3794. * false otherwise
  3795. */
  3796. function nextFragment() {
  3797. return navigateFragment( null, 1 );
  3798. }
  3799. /**
  3800. * Navigate to the previous slide fragment.
  3801. *
  3802. * @return {boolean} true if there was a previous fragment,
  3803. * false otherwise
  3804. */
  3805. function previousFragment() {
  3806. return navigateFragment( null, -1 );
  3807. }
  3808. /**
  3809. * Cues a new automated slide if enabled in the config.
  3810. */
  3811. function cueAutoSlide() {
  3812. cancelAutoSlide();
  3813. if( currentSlide && config.autoSlide !== false ) {
  3814. var fragment = currentSlide.querySelector( '.current-fragment' );
  3815. // When the slide first appears there is no "current" fragment so
  3816. // we look for a data-autoslide timing on the first fragment
  3817. if( !fragment ) fragment = currentSlide.querySelector( '.fragment' );
  3818. var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
  3819. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  3820. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  3821. // Pick value in the following priority order:
  3822. // 1. Current fragment's data-autoslide
  3823. // 2. Current slide's data-autoslide
  3824. // 3. Parent slide's data-autoslide
  3825. // 4. Global autoSlide setting
  3826. if( fragmentAutoSlide ) {
  3827. autoSlide = parseInt( fragmentAutoSlide, 10 );
  3828. }
  3829. else if( slideAutoSlide ) {
  3830. autoSlide = parseInt( slideAutoSlide, 10 );
  3831. }
  3832. else if( parentAutoSlide ) {
  3833. autoSlide = parseInt( parentAutoSlide, 10 );
  3834. }
  3835. else {
  3836. autoSlide = config.autoSlide;
  3837. }
  3838. // If there are media elements with data-autoplay,
  3839. // automatically set the autoSlide duration to the
  3840. // length of that media. Not applicable if the slide
  3841. // is divided up into fragments.
  3842. // playbackRate is accounted for in the duration.
  3843. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  3844. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3845. if( el.hasAttribute( 'data-autoplay' ) ) {
  3846. if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
  3847. autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
  3848. }
  3849. }
  3850. } );
  3851. }
  3852. // Cue the next auto-slide if:
  3853. // - There is an autoSlide value
  3854. // - Auto-sliding isn't paused by the user
  3855. // - The presentation isn't paused
  3856. // - The overview isn't active
  3857. // - The presentation isn't over
  3858. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  3859. autoSlideTimeout = setTimeout( function() {
  3860. typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
  3861. cueAutoSlide();
  3862. }, autoSlide );
  3863. autoSlideStartTime = Date.now();
  3864. }
  3865. if( autoSlidePlayer ) {
  3866. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  3867. }
  3868. }
  3869. }
  3870. /**
  3871. * Cancels any ongoing request to auto-slide.
  3872. */
  3873. function cancelAutoSlide() {
  3874. clearTimeout( autoSlideTimeout );
  3875. autoSlideTimeout = -1;
  3876. }
  3877. function pauseAutoSlide() {
  3878. if( autoSlide && !autoSlidePaused ) {
  3879. autoSlidePaused = true;
  3880. dispatchEvent( 'autoslidepaused' );
  3881. clearTimeout( autoSlideTimeout );
  3882. if( autoSlidePlayer ) {
  3883. autoSlidePlayer.setPlaying( false );
  3884. }
  3885. }
  3886. }
  3887. function resumeAutoSlide() {
  3888. if( autoSlide && autoSlidePaused ) {
  3889. autoSlidePaused = false;
  3890. dispatchEvent( 'autoslideresumed' );
  3891. cueAutoSlide();
  3892. }
  3893. }
  3894. function navigateLeft() {
  3895. // Reverse for RTL
  3896. if( config.rtl ) {
  3897. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  3898. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3899. }
  3900. }
  3901. // Normal navigation
  3902. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  3903. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3904. }
  3905. }
  3906. function navigateRight() {
  3907. hasNavigatedRight = true;
  3908. // Reverse for RTL
  3909. if( config.rtl ) {
  3910. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  3911. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3912. }
  3913. }
  3914. // Normal navigation
  3915. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  3916. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3917. }
  3918. }
  3919. function navigateUp() {
  3920. // Prioritize hiding fragments
  3921. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  3922. slide( indexh, indexv - 1 );
  3923. }
  3924. }
  3925. function navigateDown() {
  3926. hasNavigatedDown = true;
  3927. // Prioritize revealing fragments
  3928. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  3929. slide( indexh, indexv + 1 );
  3930. }
  3931. }
  3932. /**
  3933. * Navigates backwards, prioritized in the following order:
  3934. * 1) Previous fragment
  3935. * 2) Previous vertical slide
  3936. * 3) Previous horizontal slide
  3937. */
  3938. function navigatePrev() {
  3939. // Prioritize revealing fragments
  3940. if( previousFragment() === false ) {
  3941. if( availableRoutes().up ) {
  3942. navigateUp();
  3943. }
  3944. else {
  3945. // Fetch the previous horizontal slide, if there is one
  3946. var previousSlide;
  3947. if( config.rtl ) {
  3948. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  3949. }
  3950. else {
  3951. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  3952. }
  3953. if( previousSlide ) {
  3954. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  3955. var h = indexh - 1;
  3956. slide( h, v );
  3957. }
  3958. }
  3959. }
  3960. }
  3961. /**
  3962. * The reverse of #navigatePrev().
  3963. */
  3964. function navigateNext() {
  3965. hasNavigatedRight = true;
  3966. hasNavigatedDown = true;
  3967. // Prioritize revealing fragments
  3968. if( nextFragment() === false ) {
  3969. var routes = availableRoutes();
  3970. // When looping is enabled `routes.down` is always available
  3971. // so we need a separate check for when we've reached the
  3972. // end of a stack and should move horizontally
  3973. if( routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide( currentSlide ) ) {
  3974. routes.down = false;
  3975. }
  3976. if( routes.down ) {
  3977. navigateDown();
  3978. }
  3979. else if( config.rtl ) {
  3980. navigateLeft();
  3981. }
  3982. else {
  3983. navigateRight();
  3984. }
  3985. }
  3986. }
  3987. /**
  3988. * Checks if the target element prevents the triggering of
  3989. * swipe navigation.
  3990. */
  3991. function isSwipePrevented( target ) {
  3992. while( target && typeof target.hasAttribute === 'function' ) {
  3993. if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
  3994. target = target.parentNode;
  3995. }
  3996. return false;
  3997. }
  3998. // --------------------------------------------------------------------//
  3999. // ----------------------------- EVENTS -------------------------------//
  4000. // --------------------------------------------------------------------//
  4001. /**
  4002. * Called by all event handlers that are based on user
  4003. * input.
  4004. *
  4005. * @param {object} [event]
  4006. */
  4007. function onUserInput( event ) {
  4008. if( config.autoSlideStoppable ) {
  4009. pauseAutoSlide();
  4010. }
  4011. }
  4012. /**
  4013. * Called whenever there is mouse input at the document level
  4014. * to determine if the cursor is active or not.
  4015. *
  4016. * @param {object} event
  4017. */
  4018. function onDocumentCursorActive( event ) {
  4019. showCursor();
  4020. clearTimeout( cursorInactiveTimeout );
  4021. cursorInactiveTimeout = setTimeout( hideCursor, config.hideCursorTime );
  4022. }
  4023. /**
  4024. * Handler for the document level 'keypress' event.
  4025. *
  4026. * @param {object} event
  4027. */
  4028. function onDocumentKeyPress( event ) {
  4029. // Check if the pressed key is question mark
  4030. if( event.shiftKey && event.charCode === 63 ) {
  4031. toggleHelp();
  4032. }
  4033. }
  4034. /**
  4035. * Handler for the document level 'keydown' event.
  4036. *
  4037. * @param {object} event
  4038. */
  4039. function onDocumentKeyDown( event ) {
  4040. // If there's a condition specified and it returns false,
  4041. // ignore this event
  4042. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
  4043. return true;
  4044. }
  4045. // Shorthand
  4046. var keyCode = event.keyCode;
  4047. // Remember if auto-sliding was paused so we can toggle it
  4048. var autoSlideWasPaused = autoSlidePaused;
  4049. onUserInput( event );
  4050. // Is there a focused element that could be using the keyboard?
  4051. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  4052. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  4053. var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
  4054. // Whitelist specific modified + keycode combinations
  4055. var prevSlideShortcut = event.shiftKey && event.keyCode === 32;
  4056. var firstSlideShortcut = event.shiftKey && keyCode === 37;
  4057. var lastSlideShortcut = event.shiftKey && keyCode === 39;
  4058. // Prevent all other events when a modifier is pressed
  4059. var unusedModifier = !prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
  4060. ( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );
  4061. // Disregard the event if there's a focused element or a
  4062. // keyboard modifier key is present
  4063. if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;
  4064. // While paused only allow resume keyboard events; 'b', 'v', '.'
  4065. var resumeKeyCodes = [66,86,190,191];
  4066. var key;
  4067. // Custom key bindings for togglePause should be able to resume
  4068. if( typeof config.keyboard === 'object' ) {
  4069. for( key in config.keyboard ) {
  4070. if( config.keyboard[key] === 'togglePause' ) {
  4071. resumeKeyCodes.push( parseInt( key, 10 ) );
  4072. }
  4073. }
  4074. }
  4075. if( isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
  4076. return false;
  4077. }
  4078. // Use linear navigation if we're configured to OR if
  4079. // the presentation is one-dimensional
  4080. var useLinearMode = config.navigationMode === 'linear' || !hasHorizontalSlides() || !hasVerticalSlides();
  4081. var triggered = false;
  4082. // 1. User defined key bindings
  4083. if( typeof config.keyboard === 'object' ) {
  4084. for( key in config.keyboard ) {
  4085. // Check if this binding matches the pressed key
  4086. if( parseInt( key, 10 ) === keyCode ) {
  4087. var value = config.keyboard[ key ];
  4088. // Callback function
  4089. if( typeof value === 'function' ) {
  4090. value.apply( null, [ event ] );
  4091. }
  4092. // String shortcuts to reveal.js API
  4093. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  4094. Reveal[ value ].call();
  4095. }
  4096. triggered = true;
  4097. }
  4098. }
  4099. }
  4100. // 2. Registered custom key bindings
  4101. if( triggered === false ) {
  4102. for( key in registeredKeyBindings ) {
  4103. // Check if this binding matches the pressed key
  4104. if( parseInt( key, 10 ) === keyCode ) {
  4105. var action = registeredKeyBindings[ key ].callback;
  4106. // Callback function
  4107. if( typeof action === 'function' ) {
  4108. action.apply( null, [ event ] );
  4109. }
  4110. // String shortcuts to reveal.js API
  4111. else if( typeof action === 'string' && typeof Reveal[ action ] === 'function' ) {
  4112. Reveal[ action ].call();
  4113. }
  4114. triggered = true;
  4115. }
  4116. }
  4117. }
  4118. // 3. System defined key bindings
  4119. if( triggered === false ) {
  4120. // Assume true and try to prove false
  4121. triggered = true;
  4122. // P, PAGE UP
  4123. if( keyCode === 80 || keyCode === 33 ) {
  4124. navigatePrev();
  4125. }
  4126. // N, PAGE DOWN
  4127. else if( keyCode === 78 || keyCode === 34 ) {
  4128. navigateNext();
  4129. }
  4130. // H, LEFT
  4131. else if( keyCode === 72 || keyCode === 37 ) {
  4132. if( firstSlideShortcut ) {
  4133. slide( 0 );
  4134. }
  4135. else if( !isOverview() && useLinearMode ) {
  4136. navigatePrev();
  4137. }
  4138. else {
  4139. navigateLeft();
  4140. }
  4141. }
  4142. // L, RIGHT
  4143. else if( keyCode === 76 || keyCode === 39 ) {
  4144. if( lastSlideShortcut ) {
  4145. slide( Number.MAX_VALUE );
  4146. }
  4147. else if( !isOverview() && useLinearMode ) {
  4148. navigateNext();
  4149. }
  4150. else {
  4151. navigateRight();
  4152. }
  4153. }
  4154. // K, UP
  4155. else if( keyCode === 75 || keyCode === 38 ) {
  4156. if( !isOverview() && useLinearMode ) {
  4157. navigatePrev();
  4158. }
  4159. else {
  4160. navigateUp();
  4161. }
  4162. }
  4163. // J, DOWN
  4164. else if( keyCode === 74 || keyCode === 40 ) {
  4165. if( !isOverview() && useLinearMode ) {
  4166. navigateNext();
  4167. }
  4168. else {
  4169. navigateDown();
  4170. }
  4171. }
  4172. // HOME
  4173. else if( keyCode === 36 ) {
  4174. slide( 0 );
  4175. }
  4176. // END
  4177. else if( keyCode === 35 ) {
  4178. slide( Number.MAX_VALUE );
  4179. }
  4180. // SPACE
  4181. else if( keyCode === 32 ) {
  4182. if( isOverview() ) {
  4183. deactivateOverview();
  4184. }
  4185. if( event.shiftKey ) {
  4186. navigatePrev();
  4187. }
  4188. else {
  4189. navigateNext();
  4190. }
  4191. }
  4192. // TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS "BLACK SCREEN" BUTTON
  4193. else if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {
  4194. togglePause();
  4195. }
  4196. // F
  4197. else if( keyCode === 70 ) {
  4198. enterFullscreen();
  4199. }
  4200. // A
  4201. else if( keyCode === 65 ) {
  4202. if ( config.autoSlideStoppable ) {
  4203. toggleAutoSlide( autoSlideWasPaused );
  4204. }
  4205. }
  4206. else {
  4207. triggered = false;
  4208. }
  4209. }
  4210. // If the input resulted in a triggered action we should prevent
  4211. // the browsers default behavior
  4212. if( triggered ) {
  4213. event.preventDefault && event.preventDefault();
  4214. }
  4215. // ESC or O key
  4216. else if ( ( keyCode === 27 || keyCode === 79 ) && features.transforms3d ) {
  4217. if( dom.overlay ) {
  4218. closeOverlay();
  4219. }
  4220. else {
  4221. toggleOverview();
  4222. }
  4223. event.preventDefault && event.preventDefault();
  4224. }
  4225. // If auto-sliding is enabled we need to cue up
  4226. // another timeout
  4227. cueAutoSlide();
  4228. }
  4229. /**
  4230. * Handler for the 'touchstart' event, enables support for
  4231. * swipe and pinch gestures.
  4232. *
  4233. * @param {object} event
  4234. */
  4235. function onTouchStart( event ) {
  4236. if( isSwipePrevented( event.target ) ) return true;
  4237. touch.startX = event.touches[0].clientX;
  4238. touch.startY = event.touches[0].clientY;
  4239. touch.startCount = event.touches.length;
  4240. }
  4241. /**
  4242. * Handler for the 'touchmove' event.
  4243. *
  4244. * @param {object} event
  4245. */
  4246. function onTouchMove( event ) {
  4247. if( isSwipePrevented( event.target ) ) return true;
  4248. // Each touch should only trigger one action
  4249. if( !touch.captured ) {
  4250. onUserInput( event );
  4251. var currentX = event.touches[0].clientX;
  4252. var currentY = event.touches[0].clientY;
  4253. // There was only one touch point, look for a swipe
  4254. if( event.touches.length === 1 && touch.startCount !== 2 ) {
  4255. var deltaX = currentX - touch.startX,
  4256. deltaY = currentY - touch.startY;
  4257. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4258. touch.captured = true;
  4259. if( config.navigationMode === 'linear' ) {
  4260. if( config.rtl ) {
  4261. navigateNext();
  4262. }
  4263. else {
  4264. navigatePrev();
  4265. }
  4266. }
  4267. else {
  4268. navigateLeft();
  4269. }
  4270. }
  4271. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4272. touch.captured = true;
  4273. if( config.navigationMode === 'linear' ) {
  4274. if( config.rtl ) {
  4275. navigatePrev();
  4276. }
  4277. else {
  4278. navigateNext();
  4279. }
  4280. }
  4281. else {
  4282. navigateRight();
  4283. }
  4284. }
  4285. else if( deltaY > touch.threshold ) {
  4286. touch.captured = true;
  4287. if( config.navigationMode === 'linear' ) {
  4288. navigatePrev();
  4289. }
  4290. else {
  4291. navigateUp();
  4292. }
  4293. }
  4294. else if( deltaY < -touch.threshold ) {
  4295. touch.captured = true;
  4296. if( config.navigationMode === 'linear' ) {
  4297. navigateNext();
  4298. }
  4299. else {
  4300. navigateDown();
  4301. }
  4302. }
  4303. // If we're embedded, only block touch events if they have
  4304. // triggered an action
  4305. if( config.embedded ) {
  4306. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  4307. event.preventDefault();
  4308. }
  4309. }
  4310. // Not embedded? Block them all to avoid needless tossing
  4311. // around of the viewport in iOS
  4312. else {
  4313. event.preventDefault();
  4314. }
  4315. }
  4316. }
  4317. // There's a bug with swiping on some Android devices unless
  4318. // the default action is always prevented
  4319. else if( UA.match( /android/gi ) ) {
  4320. event.preventDefault();
  4321. }
  4322. }
  4323. /**
  4324. * Handler for the 'touchend' event.
  4325. *
  4326. * @param {object} event
  4327. */
  4328. function onTouchEnd( event ) {
  4329. touch.captured = false;
  4330. }
  4331. /**
  4332. * Convert pointer down to touch start.
  4333. *
  4334. * @param {object} event
  4335. */
  4336. function onPointerDown( event ) {
  4337. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4338. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4339. onTouchStart( event );
  4340. }
  4341. }
  4342. /**
  4343. * Convert pointer move to touch move.
  4344. *
  4345. * @param {object} event
  4346. */
  4347. function onPointerMove( event ) {
  4348. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4349. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4350. onTouchMove( event );
  4351. }
  4352. }
  4353. /**
  4354. * Convert pointer up to touch end.
  4355. *
  4356. * @param {object} event
  4357. */
  4358. function onPointerUp( event ) {
  4359. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4360. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4361. onTouchEnd( event );
  4362. }
  4363. }
  4364. /**
  4365. * Handles mouse wheel scrolling, throttled to avoid skipping
  4366. * multiple slides.
  4367. *
  4368. * @param {object} event
  4369. */
  4370. function onDocumentMouseScroll( event ) {
  4371. if( Date.now() - lastMouseWheelStep > 600 ) {
  4372. lastMouseWheelStep = Date.now();
  4373. var delta = event.detail || -event.wheelDelta;
  4374. if( delta > 0 ) {
  4375. navigateNext();
  4376. }
  4377. else if( delta < 0 ) {
  4378. navigatePrev();
  4379. }
  4380. }
  4381. }
  4382. /**
  4383. * Clicking on the progress bar results in a navigation to the
  4384. * closest approximate horizontal slide using this equation:
  4385. *
  4386. * ( clickX / presentationWidth ) * numberOfSlides
  4387. *
  4388. * @param {object} event
  4389. */
  4390. function onProgressClicked( event ) {
  4391. onUserInput( event );
  4392. event.preventDefault();
  4393. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  4394. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  4395. if( config.rtl ) {
  4396. slideIndex = slidesTotal - slideIndex;
  4397. }
  4398. slide( slideIndex );
  4399. }
  4400. /**
  4401. * Event handler for navigation control buttons.
  4402. */
  4403. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigatePrev() : navigateLeft(); }
  4404. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigateNext() : navigateRight(); }
  4405. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  4406. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  4407. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  4408. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  4409. /**
  4410. * Handler for the window level 'hashchange' event.
  4411. *
  4412. * @param {object} [event]
  4413. */
  4414. function onWindowHashChange( event ) {
  4415. readURL();
  4416. }
  4417. /**
  4418. * Handler for the window level 'resize' event.
  4419. *
  4420. * @param {object} [event]
  4421. */
  4422. function onWindowResize( event ) {
  4423. layout();
  4424. }
  4425. /**
  4426. * Handle for the window level 'visibilitychange' event.
  4427. *
  4428. * @param {object} [event]
  4429. */
  4430. function onPageVisibilityChange( event ) {
  4431. var isHidden = document.webkitHidden ||
  4432. document.msHidden ||
  4433. document.hidden;
  4434. // If, after clicking a link or similar and we're coming back,
  4435. // focus the document.body to ensure we can use keyboard shortcuts
  4436. if( isHidden === false && document.activeElement !== document.body ) {
  4437. // Not all elements support .blur() - SVGs among them.
  4438. if( typeof document.activeElement.blur === 'function' ) {
  4439. document.activeElement.blur();
  4440. }
  4441. document.body.focus();
  4442. }
  4443. }
  4444. /**
  4445. * Invoked when a slide is and we're in the overview.
  4446. *
  4447. * @param {object} event
  4448. */
  4449. function onOverviewSlideClicked( event ) {
  4450. // TODO There's a bug here where the event listeners are not
  4451. // removed after deactivating the overview.
  4452. if( eventsAreBound && isOverview() ) {
  4453. event.preventDefault();
  4454. var element = event.target;
  4455. while( element && !element.nodeName.match( /section/gi ) ) {
  4456. element = element.parentNode;
  4457. }
  4458. if( element && !element.classList.contains( 'disabled' ) ) {
  4459. deactivateOverview();
  4460. if( element.nodeName.match( /section/gi ) ) {
  4461. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  4462. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  4463. slide( h, v );
  4464. }
  4465. }
  4466. }
  4467. }
  4468. /**
  4469. * Handles clicks on links that are set to preview in the
  4470. * iframe overlay.
  4471. *
  4472. * @param {object} event
  4473. */
  4474. function onPreviewLinkClicked( event ) {
  4475. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  4476. var url = event.currentTarget.getAttribute( 'href' );
  4477. if( url ) {
  4478. showPreview( url );
  4479. event.preventDefault();
  4480. }
  4481. }
  4482. }
  4483. /**
  4484. * Handles click on the auto-sliding controls element.
  4485. *
  4486. * @param {object} [event]
  4487. */
  4488. function onAutoSlidePlayerClick( event ) {
  4489. // Replay
  4490. if( Reveal.isLastSlide() && config.loop === false ) {
  4491. slide( 0, 0 );
  4492. resumeAutoSlide();
  4493. }
  4494. // Resume
  4495. else if( autoSlidePaused ) {
  4496. resumeAutoSlide();
  4497. }
  4498. // Pause
  4499. else {
  4500. pauseAutoSlide();
  4501. }
  4502. }
  4503. // --------------------------------------------------------------------//
  4504. // ------------------------ PLAYBACK COMPONENT ------------------------//
  4505. // --------------------------------------------------------------------//
  4506. /**
  4507. * Constructor for the playback component, which displays
  4508. * play/pause/progress controls.
  4509. *
  4510. * @param {HTMLElement} container The component will append
  4511. * itself to this
  4512. * @param {function} progressCheck A method which will be
  4513. * called frequently to get the current progress on a range
  4514. * of 0-1
  4515. */
  4516. function Playback( container, progressCheck ) {
  4517. // Cosmetics
  4518. this.diameter = 100;
  4519. this.diameter2 = this.diameter/2;
  4520. this.thickness = 6;
  4521. // Flags if we are currently playing
  4522. this.playing = false;
  4523. // Current progress on a 0-1 range
  4524. this.progress = 0;
  4525. // Used to loop the animation smoothly
  4526. this.progressOffset = 1;
  4527. this.container = container;
  4528. this.progressCheck = progressCheck;
  4529. this.canvas = document.createElement( 'canvas' );
  4530. this.canvas.className = 'playback';
  4531. this.canvas.width = this.diameter;
  4532. this.canvas.height = this.diameter;
  4533. this.canvas.style.width = this.diameter2 + 'px';
  4534. this.canvas.style.height = this.diameter2 + 'px';
  4535. this.context = this.canvas.getContext( '2d' );
  4536. this.container.appendChild( this.canvas );
  4537. this.render();
  4538. }
  4539. /**
  4540. * @param value
  4541. */
  4542. Playback.prototype.setPlaying = function( value ) {
  4543. var wasPlaying = this.playing;
  4544. this.playing = value;
  4545. // Start repainting if we weren't already
  4546. if( !wasPlaying && this.playing ) {
  4547. this.animate();
  4548. }
  4549. else {
  4550. this.render();
  4551. }
  4552. };
  4553. Playback.prototype.animate = function() {
  4554. var progressBefore = this.progress;
  4555. this.progress = this.progressCheck();
  4556. // When we loop, offset the progress so that it eases
  4557. // smoothly rather than immediately resetting
  4558. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  4559. this.progressOffset = this.progress;
  4560. }
  4561. this.render();
  4562. if( this.playing ) {
  4563. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  4564. }
  4565. };
  4566. /**
  4567. * Renders the current progress and playback state.
  4568. */
  4569. Playback.prototype.render = function() {
  4570. var progress = this.playing ? this.progress : 0,
  4571. radius = ( this.diameter2 ) - this.thickness,
  4572. x = this.diameter2,
  4573. y = this.diameter2,
  4574. iconSize = 28;
  4575. // Ease towards 1
  4576. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  4577. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  4578. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  4579. this.context.save();
  4580. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  4581. // Solid background color
  4582. this.context.beginPath();
  4583. this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
  4584. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  4585. this.context.fill();
  4586. // Draw progress track
  4587. this.context.beginPath();
  4588. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  4589. this.context.lineWidth = this.thickness;
  4590. this.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';
  4591. this.context.stroke();
  4592. if( this.playing ) {
  4593. // Draw progress on top of track
  4594. this.context.beginPath();
  4595. this.context.arc( x, y, radius, startAngle, endAngle, false );
  4596. this.context.lineWidth = this.thickness;
  4597. this.context.strokeStyle = '#fff';
  4598. this.context.stroke();
  4599. }
  4600. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  4601. // Draw play/pause icons
  4602. if( this.playing ) {
  4603. this.context.fillStyle = '#fff';
  4604. this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
  4605. this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
  4606. }
  4607. else {
  4608. this.context.beginPath();
  4609. this.context.translate( 4, 0 );
  4610. this.context.moveTo( 0, 0 );
  4611. this.context.lineTo( iconSize - 4, iconSize / 2 );
  4612. this.context.lineTo( 0, iconSize );
  4613. this.context.fillStyle = '#fff';
  4614. this.context.fill();
  4615. }
  4616. this.context.restore();
  4617. };
  4618. Playback.prototype.on = function( type, listener ) {
  4619. this.canvas.addEventListener( type, listener, false );
  4620. };
  4621. Playback.prototype.off = function( type, listener ) {
  4622. this.canvas.removeEventListener( type, listener, false );
  4623. };
  4624. Playback.prototype.destroy = function() {
  4625. this.playing = false;
  4626. if( this.canvas.parentNode ) {
  4627. this.container.removeChild( this.canvas );
  4628. }
  4629. };
  4630. // --------------------------------------------------------------------//
  4631. // ------------------------------- API --------------------------------//
  4632. // --------------------------------------------------------------------//
  4633. Reveal = {
  4634. VERSION: VERSION,
  4635. initialize: initialize,
  4636. configure: configure,
  4637. sync: sync,
  4638. syncSlide: syncSlide,
  4639. syncFragments: syncFragments,
  4640. // Navigation methods
  4641. slide: slide,
  4642. left: navigateLeft,
  4643. right: navigateRight,
  4644. up: navigateUp,
  4645. down: navigateDown,
  4646. prev: navigatePrev,
  4647. next: navigateNext,
  4648. // Fragment methods
  4649. navigateFragment: navigateFragment,
  4650. prevFragment: previousFragment,
  4651. nextFragment: nextFragment,
  4652. // Deprecated aliases
  4653. navigateTo: slide,
  4654. navigateLeft: navigateLeft,
  4655. navigateRight: navigateRight,
  4656. navigateUp: navigateUp,
  4657. navigateDown: navigateDown,
  4658. navigatePrev: navigatePrev,
  4659. navigateNext: navigateNext,
  4660. // Forces an update in slide layout
  4661. layout: layout,
  4662. // Randomizes the order of slides
  4663. shuffle: shuffle,
  4664. // Returns an object with the available routes as booleans (left/right/top/bottom)
  4665. availableRoutes: availableRoutes,
  4666. // Returns an object with the available fragments as booleans (prev/next)
  4667. availableFragments: availableFragments,
  4668. // Toggles a help overlay with keyboard shortcuts
  4669. toggleHelp: toggleHelp,
  4670. // Toggles the overview mode on/off
  4671. toggleOverview: toggleOverview,
  4672. // Toggles the "black screen" mode on/off
  4673. togglePause: togglePause,
  4674. // Toggles the auto slide mode on/off
  4675. toggleAutoSlide: toggleAutoSlide,
  4676. // State checks
  4677. isOverview: isOverview,
  4678. isPaused: isPaused,
  4679. isAutoSliding: isAutoSliding,
  4680. isSpeakerNotes: isSpeakerNotes,
  4681. // Slide preloading
  4682. loadSlide: loadSlide,
  4683. unloadSlide: unloadSlide,
  4684. // Adds or removes all internal event listeners (such as keyboard)
  4685. addEventListeners: addEventListeners,
  4686. removeEventListeners: removeEventListeners,
  4687. // Facility for persisting and restoring the presentation state
  4688. getState: getState,
  4689. setState: setState,
  4690. // Presentation progress
  4691. getSlidePastCount: getSlidePastCount,
  4692. // Presentation progress on range of 0-1
  4693. getProgress: getProgress,
  4694. // Returns the indices of the current, or specified, slide
  4695. getIndices: getIndices,
  4696. // Returns an Array of all slides
  4697. getSlides: getSlides,
  4698. // Returns an Array of objects representing the attributes on
  4699. // the slides
  4700. getSlidesAttributes: getSlidesAttributes,
  4701. // Returns the total number of slides
  4702. getTotalSlides: getTotalSlides,
  4703. // Returns the slide element at the specified index
  4704. getSlide: getSlide,
  4705. // Returns the slide background element at the specified index
  4706. getSlideBackground: getSlideBackground,
  4707. // Returns the speaker notes string for a slide, or null
  4708. getSlideNotes: getSlideNotes,
  4709. // Returns an array with all horizontal/vertical slides in the deck
  4710. getHorizontalSlides: getHorizontalSlides,
  4711. getVerticalSlides: getVerticalSlides,
  4712. // Checks if the presentation contains two or more
  4713. // horizontal/vertical slides
  4714. hasHorizontalSlides: hasHorizontalSlides,
  4715. hasVerticalSlides: hasVerticalSlides,
  4716. // Returns the previous slide element, may be null
  4717. getPreviousSlide: function() {
  4718. return previousSlide;
  4719. },
  4720. // Returns the current slide element
  4721. getCurrentSlide: function() {
  4722. return currentSlide;
  4723. },
  4724. // Returns the current scale of the presentation content
  4725. getScale: function() {
  4726. return scale;
  4727. },
  4728. // Returns the current configuration object
  4729. getConfig: function() {
  4730. return config;
  4731. },
  4732. // Helper method, retrieves query string as a key/value hash
  4733. getQueryHash: function() {
  4734. var query = {};
  4735. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  4736. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  4737. } );
  4738. // Basic deserialization
  4739. for( var i in query ) {
  4740. var value = query[ i ];
  4741. query[ i ] = deserialize( unescape( value ) );
  4742. }
  4743. return query;
  4744. },
  4745. // Returns the top-level DOM element
  4746. getRevealElement: function() {
  4747. return dom.wrapper || document.querySelector( '.reveal' );
  4748. },
  4749. // Returns a hash with all registered plugins
  4750. getPlugins: function() {
  4751. return plugins;
  4752. },
  4753. // Returns true if we're currently on the first slide
  4754. isFirstSlide: function() {
  4755. return ( indexh === 0 && indexv === 0 );
  4756. },
  4757. // Returns true if we're currently on the last slide
  4758. isLastSlide: function() {
  4759. if( currentSlide ) {
  4760. // Does this slide have a next sibling?
  4761. if( currentSlide.nextElementSibling ) return false;
  4762. // If it's vertical, does its parent have a next sibling?
  4763. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  4764. return true;
  4765. }
  4766. return false;
  4767. },
  4768. // Returns true if we're on the last slide in the current
  4769. // vertical stack
  4770. isLastVerticalSlide: function() {
  4771. if( currentSlide && isVerticalSlide( currentSlide ) ) {
  4772. // Does this slide have a next sibling?
  4773. if( currentSlide.nextElementSibling ) return false;
  4774. return true;
  4775. }
  4776. return false;
  4777. },
  4778. // Checks if reveal.js has been loaded and is ready for use
  4779. isReady: function() {
  4780. return loaded;
  4781. },
  4782. // Forward event binding to the reveal DOM element
  4783. addEventListener: function( type, listener, useCapture ) {
  4784. if( 'addEventListener' in window ) {
  4785. Reveal.getRevealElement().addEventListener( type, listener, useCapture );
  4786. }
  4787. },
  4788. removeEventListener: function( type, listener, useCapture ) {
  4789. if( 'addEventListener' in window ) {
  4790. Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
  4791. }
  4792. },
  4793. // Adds/removes a custom key binding
  4794. addKeyBinding: addKeyBinding,
  4795. removeKeyBinding: removeKeyBinding,
  4796. // API for registering and retrieving plugins
  4797. registerPlugin: registerPlugin,
  4798. hasPlugin: hasPlugin,
  4799. getPlugin: getPlugin,
  4800. // Programmatically triggers a keyboard event
  4801. triggerKey: function( keyCode ) {
  4802. onDocumentKeyDown( { keyCode: keyCode } );
  4803. },
  4804. // Registers a new shortcut to include in the help overlay
  4805. registerKeyboardShortcut: function( key, value ) {
  4806. keyboardShortcuts[key] = value;
  4807. }
  4808. };
  4809. return Reveal;
  4810. }));