reveal.js 162 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 = '3.7.0';
  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. With "gridNavigation" enabled the same navigation
  123. // takes you 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. // Controls automatic progression to the next slide
  148. // - 0: Auto-sliding only happens if the data-autoslide HTML attribute
  149. // is present on the current slide or fragment
  150. // - 1+: All slides will progress automatically at the given interval
  151. // - false: No auto-sliding, even if data-autoslide is present
  152. autoSlide: 0,
  153. // Stop auto-sliding after user input
  154. autoSlideStoppable: true,
  155. // Use this method for navigation when auto-sliding (defaults to navigateNext)
  156. autoSlideMethod: null,
  157. // Specify the average time in seconds that you think you will spend
  158. // presenting each slide. This is used to show a pacing timer in the
  159. // speaker view
  160. defaultTiming: null,
  161. // Enable slide navigation via mouse wheel
  162. mouseWheel: false,
  163. // Apply a 3D roll to links on hover
  164. rollingLinks: false,
  165. // Hides the address bar on mobile devices
  166. hideAddressBar: true,
  167. // Opens links in an iframe preview overlay
  168. // Add `data-preview-link` and `data-preview-link="false"` to customise each link
  169. // individually
  170. previewLinks: false,
  171. // Exposes the reveal.js API through window.postMessage
  172. postMessage: true,
  173. // Dispatches all reveal.js events to the parent window through postMessage
  174. postMessageEvents: false,
  175. // Focuses body when page changes visibility to ensure keyboard shortcuts work
  176. focusBodyOnPageVisibilityChange: true,
  177. // Transition style
  178. transition: 'slide', // none/fade/slide/convex/concave/zoom
  179. // Transition speed
  180. transitionSpeed: 'default', // default/fast/slow
  181. // Transition style for full page slide backgrounds
  182. backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
  183. // Parallax background image
  184. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  185. // Parallax background size
  186. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  187. // Parallax background repeat
  188. parallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit
  189. // Parallax background position
  190. parallaxBackgroundPosition: '', // CSS syntax, e.g. "top left"
  191. // Amount of pixels to move the parallax background per slide step
  192. parallaxBackgroundHorizontal: null,
  193. parallaxBackgroundVertical: null,
  194. // The maximum number of pages a single slide can expand onto when printing
  195. // to PDF, unlimited by default
  196. pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,
  197. // Prints each fragment on a separate slide
  198. pdfSeparateFragments: true,
  199. // Offset used to reduce the height of content within exported PDF pages.
  200. // This exists to account for environment differences based on how you
  201. // print to PDF. CLI printing options, like phantomjs and wkpdf, can end
  202. // on precisely the total height of the document whereas in-browser
  203. // printing has to end one pixel before.
  204. pdfPageHeightOffset: -1,
  205. // Number of slides away from the current that are visible
  206. viewDistance: 3,
  207. // The display mode that will be used to show slides
  208. display: 'block',
  209. // Hide cursor if inactive
  210. hideInactiveCursor: true,
  211. // Time before the cursor is hidden (in ms)
  212. hideCursorTime: 5000,
  213. // Script dependencies to load
  214. dependencies: []
  215. },
  216. // Flags if Reveal.initialize() has been called
  217. initialized = false,
  218. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  219. loaded = false,
  220. // Flags if the overview mode is currently active
  221. overview = false,
  222. // Holds the dimensions of our overview slides, including margins
  223. overviewSlideWidth = null,
  224. overviewSlideHeight = null,
  225. // The horizontal and vertical index of the currently active slide
  226. indexh,
  227. indexv,
  228. // The previous and current slide HTML elements
  229. previousSlide,
  230. currentSlide,
  231. previousBackground,
  232. // Remember which directions that the user has navigated towards
  233. hasNavigatedRight = false,
  234. hasNavigatedDown = false,
  235. // Slides may hold a data-state attribute which we pick up and apply
  236. // as a class to the body. This list contains the combined state of
  237. // all current slides.
  238. state = [],
  239. // The current scale of the presentation (see width/height config)
  240. scale = 1,
  241. // CSS transform that is currently applied to the slides container,
  242. // split into two groups
  243. slidesTransform = { layout: '', overview: '' },
  244. // Cached references to DOM elements
  245. dom = {},
  246. // A list of registered reveal.js plugins
  247. plugins = {},
  248. // List of asynchronously loaded reveal.js dependencies
  249. asyncDependencies = [],
  250. // Features supported by the browser, see #checkCapabilities()
  251. features = {},
  252. // Client is a mobile device, see #checkCapabilities()
  253. isMobileDevice,
  254. // Client is a desktop Chrome, see #checkCapabilities()
  255. isChrome,
  256. // Throttles mouse wheel navigation
  257. lastMouseWheelStep = 0,
  258. // Delays updates to the URL due to a Chrome thumbnailer bug
  259. writeURLTimeout = 0,
  260. // Is the mouse pointer currently hidden from view
  261. cursorHidden = false,
  262. // Timeout used to determine when the cursor is inactive
  263. cursorInactiveTimeout = 0,
  264. // Flags if the interaction event listeners are bound
  265. eventsAreBound = false,
  266. // The current auto-slide duration
  267. autoSlide = 0,
  268. // Auto slide properties
  269. autoSlidePlayer,
  270. autoSlideTimeout = 0,
  271. autoSlideStartTime = -1,
  272. autoSlidePaused = false,
  273. // Holds information about the currently ongoing touch input
  274. touch = {
  275. startX: 0,
  276. startY: 0,
  277. startCount: 0,
  278. captured: false,
  279. threshold: 40
  280. },
  281. // Holds information about the keyboard shortcuts
  282. keyboardShortcuts = {
  283. 'N , SPACE': 'Next slide',
  284. 'P': 'Previous slide',
  285. '← , H': 'Navigate left',
  286. '→ , L': 'Navigate right',
  287. '↑ , K': 'Navigate up',
  288. '↓ , J': 'Navigate down',
  289. 'Home , ⌘/CTRL ←': 'First slide',
  290. 'End , ⌘/CTRL →': 'Last slide',
  291. 'B , .': 'Pause',
  292. 'F': 'Fullscreen',
  293. 'ESC, O': 'Slide overview'
  294. },
  295. // Holds custom key code mappings
  296. registeredKeyBindings = {};
  297. /**
  298. * Starts up the presentation if the client is capable.
  299. */
  300. function initialize( options ) {
  301. // Make sure we only initialize once
  302. if( initialized === true ) return;
  303. initialized = true;
  304. checkCapabilities();
  305. if( !features.transforms2d && !features.transforms3d ) {
  306. document.body.setAttribute( 'class', 'no-transforms' );
  307. // Since JS won't be running any further, we load all lazy
  308. // loading elements upfront
  309. var images = toArray( document.getElementsByTagName( 'img' ) ),
  310. iframes = toArray( document.getElementsByTagName( 'iframe' ) );
  311. var lazyLoadable = images.concat( iframes );
  312. for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
  313. var element = lazyLoadable[i];
  314. if( element.getAttribute( 'data-src' ) ) {
  315. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  316. element.removeAttribute( 'data-src' );
  317. }
  318. }
  319. // If the browser doesn't support core features we won't be
  320. // using JavaScript to control the presentation
  321. return;
  322. }
  323. // Cache references to key DOM elements
  324. dom.wrapper = document.querySelector( '.reveal' );
  325. dom.slides = document.querySelector( '.reveal .slides' );
  326. // Force a layout when the whole page, incl fonts, has loaded
  327. window.addEventListener( 'load', layout, false );
  328. var query = Reveal.getQueryHash();
  329. // Do not accept new dependencies via query config to avoid
  330. // the potential of malicious script injection
  331. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  332. // Copy options over to our config object
  333. extend( config, options );
  334. extend( config, query );
  335. // Hide the address bar in mobile browsers
  336. hideAddressBar();
  337. // Loads dependencies and continues to #start() once done
  338. load();
  339. }
  340. /**
  341. * Inspect the client to see what it's capable of, this
  342. * should only happens once per runtime.
  343. */
  344. function checkCapabilities() {
  345. isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA );
  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. // Background image options are set on the content wrapper
  943. if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
  944. if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;
  945. if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;
  946. if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;
  947. // If this slide has a background color, we add a class that
  948. // signals if it is light or dark. If the slide has no background
  949. // color, no class will be added
  950. var contrastColor = data.backgroundColor;
  951. // If no bg color was found, check the computed background
  952. if( !contrastColor ) {
  953. var computedBackgroundStyle = window.getComputedStyle( element );
  954. if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
  955. contrastColor = computedBackgroundStyle.backgroundColor;
  956. }
  957. }
  958. if( contrastColor ) {
  959. var rgb = colorToRgb( contrastColor );
  960. // Ignore fully transparent backgrounds. Some browsers return
  961. // rgba(0,0,0,0) when reading the computed background color of
  962. // an element with no background
  963. if( rgb && rgb.a !== 0 ) {
  964. if( colorBrightness( contrastColor ) < 128 ) {
  965. slide.classList.add( 'has-dark-background' );
  966. }
  967. else {
  968. slide.classList.add( 'has-light-background' );
  969. }
  970. }
  971. }
  972. }
  973. /**
  974. * Registers a listener to postMessage events, this makes it
  975. * possible to call all reveal.js API methods from another
  976. * window. For example:
  977. *
  978. * revealWindow.postMessage( JSON.stringify({
  979. * method: 'slide',
  980. * args: [ 2 ]
  981. * }), '*' );
  982. */
  983. function setupPostMessage() {
  984. if( config.postMessage ) {
  985. window.addEventListener( 'message', function ( event ) {
  986. var data = event.data;
  987. // Make sure we're dealing with JSON
  988. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  989. data = JSON.parse( data );
  990. // Check if the requested method can be found
  991. if( data.method && typeof Reveal[data.method] === 'function' ) {
  992. Reveal[data.method].apply( Reveal, data.args );
  993. }
  994. }
  995. }, false );
  996. }
  997. }
  998. /**
  999. * Applies the configuration settings from the config
  1000. * object. May be called multiple times.
  1001. *
  1002. * @param {object} options
  1003. */
  1004. function configure( options ) {
  1005. var oldTransition = config.transition;
  1006. // New config options may be passed when this method
  1007. // is invoked through the API after initialization
  1008. if( typeof options === 'object' ) extend( config, options );
  1009. // Abort if reveal.js hasn't finished loading, config
  1010. // changes will be applied automatically once loading
  1011. // finishes
  1012. if( loaded === false ) return;
  1013. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  1014. // Remove the previously configured transition class
  1015. dom.wrapper.classList.remove( oldTransition );
  1016. // Force linear transition based on browser capabilities
  1017. if( features.transforms3d === false ) config.transition = 'linear';
  1018. dom.wrapper.classList.add( config.transition );
  1019. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  1020. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  1021. dom.controls.style.display = config.controls ? 'block' : 'none';
  1022. dom.progress.style.display = config.progress ? 'block' : 'none';
  1023. dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout );
  1024. dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
  1025. if( config.shuffle ) {
  1026. shuffle();
  1027. }
  1028. if( config.rtl ) {
  1029. dom.wrapper.classList.add( 'rtl' );
  1030. }
  1031. else {
  1032. dom.wrapper.classList.remove( 'rtl' );
  1033. }
  1034. if( config.center ) {
  1035. dom.wrapper.classList.add( 'center' );
  1036. }
  1037. else {
  1038. dom.wrapper.classList.remove( 'center' );
  1039. }
  1040. // Exit the paused mode if it was configured off
  1041. if( config.pause === false ) {
  1042. resume();
  1043. }
  1044. if( config.showNotes ) {
  1045. dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
  1046. }
  1047. if( config.mouseWheel ) {
  1048. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1049. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1050. }
  1051. else {
  1052. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1053. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1054. }
  1055. // Rolling 3D links
  1056. if( config.rollingLinks ) {
  1057. enableRollingLinks();
  1058. }
  1059. else {
  1060. disableRollingLinks();
  1061. }
  1062. // Auto-hide the mouse pointer when its inactive
  1063. if( config.hideInactiveCursor ) {
  1064. document.addEventListener( 'mousemove', onDocumentCursorActive, false );
  1065. document.addEventListener( 'mousedown', onDocumentCursorActive, false );
  1066. }
  1067. else {
  1068. showCursor();
  1069. document.removeEventListener( 'mousemove', onDocumentCursorActive, false );
  1070. document.removeEventListener( 'mousedown', onDocumentCursorActive, false );
  1071. }
  1072. // Iframe link previews
  1073. if( config.previewLinks ) {
  1074. enablePreviewLinks();
  1075. disablePreviewLinks( '[data-preview-link=false]' );
  1076. }
  1077. else {
  1078. disablePreviewLinks();
  1079. enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
  1080. }
  1081. // Remove existing auto-slide controls
  1082. if( autoSlidePlayer ) {
  1083. autoSlidePlayer.destroy();
  1084. autoSlidePlayer = null;
  1085. }
  1086. // Generate auto-slide controls if needed
  1087. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  1088. autoSlidePlayer = new Playback( dom.wrapper, function() {
  1089. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  1090. } );
  1091. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  1092. autoSlidePaused = false;
  1093. }
  1094. // When fragments are turned off they should be visible
  1095. if( config.fragments === false ) {
  1096. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  1097. element.classList.add( 'visible' );
  1098. element.classList.remove( 'current-fragment' );
  1099. } );
  1100. }
  1101. // Slide numbers
  1102. var slideNumberDisplay = 'none';
  1103. if( config.slideNumber && !isPrintingPDF() ) {
  1104. if( config.showSlideNumber === 'all' ) {
  1105. slideNumberDisplay = 'block';
  1106. }
  1107. else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) {
  1108. slideNumberDisplay = 'block';
  1109. }
  1110. }
  1111. dom.slideNumber.style.display = slideNumberDisplay;
  1112. // Add the navigation mode to the DOM so we can adjust styling
  1113. if( config.navigationMode !== 'default' ) {
  1114. dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );
  1115. }
  1116. else {
  1117. dom.wrapper.removeAttribute( 'data-navigation-mode' );
  1118. }
  1119. sync();
  1120. }
  1121. /**
  1122. * Binds all event listeners.
  1123. */
  1124. function addEventListeners() {
  1125. eventsAreBound = true;
  1126. window.addEventListener( 'hashchange', onWindowHashChange, false );
  1127. window.addEventListener( 'resize', onWindowResize, false );
  1128. if( config.touch ) {
  1129. if( 'onpointerdown' in window ) {
  1130. // Use W3C pointer events
  1131. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  1132. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  1133. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  1134. }
  1135. else if( window.navigator.msPointerEnabled ) {
  1136. // IE 10 uses prefixed version of pointer events
  1137. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  1138. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  1139. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  1140. }
  1141. else {
  1142. // Fall back to touch events
  1143. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  1144. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  1145. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  1146. }
  1147. }
  1148. if( config.keyboard ) {
  1149. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  1150. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  1151. }
  1152. if( config.progress && dom.progress ) {
  1153. dom.progress.addEventListener( 'click', onProgressClicked, false );
  1154. }
  1155. dom.pauseOverlay.addEventListener( 'click', resume, false );
  1156. if( config.focusBodyOnPageVisibilityChange ) {
  1157. var visibilityChange;
  1158. if( 'hidden' in document ) {
  1159. visibilityChange = 'visibilitychange';
  1160. }
  1161. else if( 'msHidden' in document ) {
  1162. visibilityChange = 'msvisibilitychange';
  1163. }
  1164. else if( 'webkitHidden' in document ) {
  1165. visibilityChange = 'webkitvisibilitychange';
  1166. }
  1167. if( visibilityChange ) {
  1168. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  1169. }
  1170. }
  1171. // Listen to both touch and click events, in case the device
  1172. // supports both
  1173. var pointerEvents = [ 'touchstart', 'click' ];
  1174. // Only support touch for Android, fixes double navigations in
  1175. // stock browser
  1176. if( UA.match( /android/gi ) ) {
  1177. pointerEvents = [ 'touchstart' ];
  1178. }
  1179. pointerEvents.forEach( function( eventName ) {
  1180. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  1181. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  1182. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  1183. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  1184. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  1185. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  1186. } );
  1187. }
  1188. /**
  1189. * Unbinds all event listeners.
  1190. */
  1191. function removeEventListeners() {
  1192. eventsAreBound = false;
  1193. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  1194. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  1195. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  1196. window.removeEventListener( 'resize', onWindowResize, false );
  1197. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  1198. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  1199. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  1200. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  1201. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  1202. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  1203. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  1204. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  1205. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  1206. dom.pauseOverlay.removeEventListener( 'click', resume, false );
  1207. if ( config.progress && dom.progress ) {
  1208. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  1209. }
  1210. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  1211. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  1212. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  1213. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  1214. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  1215. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  1216. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  1217. } );
  1218. }
  1219. /**
  1220. * Registers a new plugin with this reveal.js instance.
  1221. *
  1222. * reveal.js waits for all regisered plugins to initialize
  1223. * before considering itself ready, as long as the plugin
  1224. * is registered before calling `Reveal.initialize()`.
  1225. */
  1226. function registerPlugin( id, plugin ) {
  1227. if( plugins[id] === undefined ) {
  1228. plugins[id] = plugin;
  1229. // If a plugin is registered after reveal.js is loaded,
  1230. // initialize it right away
  1231. if( loaded && typeof plugin.init === 'function' ) {
  1232. plugin.init();
  1233. }
  1234. }
  1235. else {
  1236. console.warn( 'reveal.js: "'+ id +'" plugin has already been registered' );
  1237. }
  1238. }
  1239. /**
  1240. * Add a custom key binding with optional description to
  1241. * be added to the help screen.
  1242. */
  1243. function addKeyBinding( binding, callback ) {
  1244. if( typeof binding === 'object' && binding.keyCode ) {
  1245. registeredKeyBindings[binding.keyCode] = {
  1246. callback: callback,
  1247. key: binding.key,
  1248. description: binding.description
  1249. };
  1250. }
  1251. else {
  1252. registeredKeyBindings[binding] = {
  1253. callback: callback,
  1254. key: null,
  1255. description: null
  1256. };
  1257. }
  1258. }
  1259. /**
  1260. * Removes the specified custom key binding.
  1261. */
  1262. function removeKeyBinding( keyCode ) {
  1263. delete registeredKeyBindings[keyCode];
  1264. }
  1265. /**
  1266. * Extend object a with the properties of object b.
  1267. * If there's a conflict, object b takes precedence.
  1268. *
  1269. * @param {object} a
  1270. * @param {object} b
  1271. */
  1272. function extend( a, b ) {
  1273. for( var i in b ) {
  1274. a[ i ] = b[ i ];
  1275. }
  1276. return a;
  1277. }
  1278. /**
  1279. * Converts the target object to an array.
  1280. *
  1281. * @param {object} o
  1282. * @return {object[]}
  1283. */
  1284. function toArray( o ) {
  1285. return Array.prototype.slice.call( o );
  1286. }
  1287. /**
  1288. * Utility for deserializing a value.
  1289. *
  1290. * @param {*} value
  1291. * @return {*}
  1292. */
  1293. function deserialize( value ) {
  1294. if( typeof value === 'string' ) {
  1295. if( value === 'null' ) return null;
  1296. else if( value === 'true' ) return true;
  1297. else if( value === 'false' ) return false;
  1298. else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
  1299. }
  1300. return value;
  1301. }
  1302. /**
  1303. * Measures the distance in pixels between point a
  1304. * and point b.
  1305. *
  1306. * @param {object} a point with x/y properties
  1307. * @param {object} b point with x/y properties
  1308. *
  1309. * @return {number}
  1310. */
  1311. function distanceBetween( a, b ) {
  1312. var dx = a.x - b.x,
  1313. dy = a.y - b.y;
  1314. return Math.sqrt( dx*dx + dy*dy );
  1315. }
  1316. /**
  1317. * Applies a CSS transform to the target element.
  1318. *
  1319. * @param {HTMLElement} element
  1320. * @param {string} transform
  1321. */
  1322. function transformElement( element, transform ) {
  1323. element.style.WebkitTransform = transform;
  1324. element.style.MozTransform = transform;
  1325. element.style.msTransform = transform;
  1326. element.style.transform = transform;
  1327. }
  1328. /**
  1329. * Applies CSS transforms to the slides container. The container
  1330. * is transformed from two separate sources: layout and the overview
  1331. * mode.
  1332. *
  1333. * @param {object} transforms
  1334. */
  1335. function transformSlides( transforms ) {
  1336. // Pick up new transforms from arguments
  1337. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  1338. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  1339. // Apply the transforms to the slides container
  1340. if( slidesTransform.layout ) {
  1341. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  1342. }
  1343. else {
  1344. transformElement( dom.slides, slidesTransform.overview );
  1345. }
  1346. }
  1347. /**
  1348. * Injects the given CSS styles into the DOM.
  1349. *
  1350. * @param {string} value
  1351. */
  1352. function injectStyleSheet( value ) {
  1353. var tag = document.createElement( 'style' );
  1354. tag.type = 'text/css';
  1355. if( tag.styleSheet ) {
  1356. tag.styleSheet.cssText = value;
  1357. }
  1358. else {
  1359. tag.appendChild( document.createTextNode( value ) );
  1360. }
  1361. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  1362. }
  1363. /**
  1364. * Find the closest parent that matches the given
  1365. * selector.
  1366. *
  1367. * @param {HTMLElement} target The child element
  1368. * @param {String} selector The CSS selector to match
  1369. * the parents against
  1370. *
  1371. * @return {HTMLElement} The matched parent or null
  1372. * if no matching parent was found
  1373. */
  1374. function closestParent( target, selector ) {
  1375. var parent = target.parentNode;
  1376. while( parent ) {
  1377. // There's some overhead doing this each time, we don't
  1378. // want to rewrite the element prototype but should still
  1379. // be enough to feature detect once at startup...
  1380. var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
  1381. // If we find a match, we're all set
  1382. if( matchesMethod && matchesMethod.call( parent, selector ) ) {
  1383. return parent;
  1384. }
  1385. // Keep searching
  1386. parent = parent.parentNode;
  1387. }
  1388. return null;
  1389. }
  1390. /**
  1391. * Converts various color input formats to an {r:0,g:0,b:0} object.
  1392. *
  1393. * @param {string} color The string representation of a color
  1394. * @example
  1395. * colorToRgb('#000');
  1396. * @example
  1397. * colorToRgb('#000000');
  1398. * @example
  1399. * colorToRgb('rgb(0,0,0)');
  1400. * @example
  1401. * colorToRgb('rgba(0,0,0)');
  1402. *
  1403. * @return {{r: number, g: number, b: number, [a]: number}|null}
  1404. */
  1405. function colorToRgb( color ) {
  1406. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  1407. if( hex3 && hex3[1] ) {
  1408. hex3 = hex3[1];
  1409. return {
  1410. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  1411. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  1412. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  1413. };
  1414. }
  1415. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  1416. if( hex6 && hex6[1] ) {
  1417. hex6 = hex6[1];
  1418. return {
  1419. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  1420. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  1421. b: parseInt( hex6.substr( 4, 2 ), 16 )
  1422. };
  1423. }
  1424. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  1425. if( rgb ) {
  1426. return {
  1427. r: parseInt( rgb[1], 10 ),
  1428. g: parseInt( rgb[2], 10 ),
  1429. b: parseInt( rgb[3], 10 )
  1430. };
  1431. }
  1432. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  1433. if( rgba ) {
  1434. return {
  1435. r: parseInt( rgba[1], 10 ),
  1436. g: parseInt( rgba[2], 10 ),
  1437. b: parseInt( rgba[3], 10 ),
  1438. a: parseFloat( rgba[4] )
  1439. };
  1440. }
  1441. return null;
  1442. }
  1443. /**
  1444. * Calculates brightness on a scale of 0-255.
  1445. *
  1446. * @param {string} color See colorToRgb for supported formats.
  1447. * @see {@link colorToRgb}
  1448. */
  1449. function colorBrightness( color ) {
  1450. if( typeof color === 'string' ) color = colorToRgb( color );
  1451. if( color ) {
  1452. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  1453. }
  1454. return null;
  1455. }
  1456. /**
  1457. * Returns the remaining height within the parent of the
  1458. * target element.
  1459. *
  1460. * remaining height = [ configured parent height ] - [ current parent height ]
  1461. *
  1462. * @param {HTMLElement} element
  1463. * @param {number} [height]
  1464. */
  1465. function getRemainingHeight( element, height ) {
  1466. height = height || 0;
  1467. if( element ) {
  1468. var newHeight, oldHeight = element.style.height;
  1469. // Change the .stretch element height to 0 in order find the height of all
  1470. // the other elements
  1471. element.style.height = '0px';
  1472. // In Overview mode, the parent (.slide) height is set of 700px.
  1473. // Restore it temporarily to its natural height.
  1474. element.parentNode.style.height = 'auto';
  1475. newHeight = height - element.parentNode.offsetHeight;
  1476. // Restore the old height, just in case
  1477. element.style.height = oldHeight + 'px';
  1478. // Clear the parent (.slide) height. .removeProperty works in IE9+
  1479. element.parentNode.style.removeProperty('height');
  1480. return newHeight;
  1481. }
  1482. return height;
  1483. }
  1484. /**
  1485. * Checks if this instance is being used to print a PDF.
  1486. */
  1487. function isPrintingPDF() {
  1488. return ( /print-pdf/gi ).test( window.location.search );
  1489. }
  1490. /**
  1491. * Hides the address bar if we're on a mobile device.
  1492. */
  1493. function hideAddressBar() {
  1494. if( config.hideAddressBar && isMobileDevice ) {
  1495. // Events that should trigger the address bar to hide
  1496. window.addEventListener( 'load', removeAddressBar, false );
  1497. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1498. }
  1499. }
  1500. /**
  1501. * Causes the address bar to hide on mobile devices,
  1502. * more vertical space ftw.
  1503. */
  1504. function removeAddressBar() {
  1505. setTimeout( function() {
  1506. window.scrollTo( 0, 1 );
  1507. }, 10 );
  1508. }
  1509. /**
  1510. * Dispatches an event of the specified type from the
  1511. * reveal DOM element.
  1512. */
  1513. function dispatchEvent( type, args ) {
  1514. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1515. event.initEvent( type, true, true );
  1516. extend( event, args );
  1517. dom.wrapper.dispatchEvent( event );
  1518. // If we're in an iframe, post each reveal.js event to the
  1519. // parent window. Used by the notes plugin
  1520. if( config.postMessageEvents && window.parent !== window.self ) {
  1521. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  1522. }
  1523. }
  1524. /**
  1525. * Wrap all links in 3D goodness.
  1526. */
  1527. function enableRollingLinks() {
  1528. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1529. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1530. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1531. var anchor = anchors[i];
  1532. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1533. var span = document.createElement('span');
  1534. span.setAttribute('data-title', anchor.text);
  1535. span.innerHTML = anchor.innerHTML;
  1536. anchor.classList.add( 'roll' );
  1537. anchor.innerHTML = '';
  1538. anchor.appendChild(span);
  1539. }
  1540. }
  1541. }
  1542. }
  1543. /**
  1544. * Unwrap all 3D links.
  1545. */
  1546. function disableRollingLinks() {
  1547. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1548. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1549. var anchor = anchors[i];
  1550. var span = anchor.querySelector( 'span' );
  1551. if( span ) {
  1552. anchor.classList.remove( 'roll' );
  1553. anchor.innerHTML = span.innerHTML;
  1554. }
  1555. }
  1556. }
  1557. /**
  1558. * Bind preview frame links.
  1559. *
  1560. * @param {string} [selector=a] - selector for anchors
  1561. */
  1562. function enablePreviewLinks( selector ) {
  1563. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1564. anchors.forEach( function( element ) {
  1565. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1566. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1567. }
  1568. } );
  1569. }
  1570. /**
  1571. * Unbind preview frame links.
  1572. */
  1573. function disablePreviewLinks( selector ) {
  1574. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1575. anchors.forEach( function( element ) {
  1576. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1577. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1578. }
  1579. } );
  1580. }
  1581. /**
  1582. * Opens a preview window for the target URL.
  1583. *
  1584. * @param {string} url - url for preview iframe src
  1585. */
  1586. function showPreview( url ) {
  1587. closeOverlay();
  1588. dom.overlay = document.createElement( 'div' );
  1589. dom.overlay.classList.add( 'overlay' );
  1590. dom.overlay.classList.add( 'overlay-preview' );
  1591. dom.wrapper.appendChild( dom.overlay );
  1592. dom.overlay.innerHTML = [
  1593. '<header>',
  1594. '<a class="close" href="#"><span class="icon"></span></a>',
  1595. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1596. '</header>',
  1597. '<div class="spinner"></div>',
  1598. '<div class="viewport">',
  1599. '<iframe src="'+ url +'"></iframe>',
  1600. '<small class="viewport-inner">',
  1601. '<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>',
  1602. '</small>',
  1603. '</div>'
  1604. ].join('');
  1605. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1606. dom.overlay.classList.add( 'loaded' );
  1607. }, false );
  1608. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1609. closeOverlay();
  1610. event.preventDefault();
  1611. }, false );
  1612. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1613. closeOverlay();
  1614. }, false );
  1615. setTimeout( function() {
  1616. dom.overlay.classList.add( 'visible' );
  1617. }, 1 );
  1618. }
  1619. /**
  1620. * Open or close help overlay window.
  1621. *
  1622. * @param {Boolean} [override] Flag which overrides the
  1623. * toggle logic and forcibly sets the desired state. True means
  1624. * help is open, false means it's closed.
  1625. */
  1626. function toggleHelp( override ){
  1627. if( typeof override === 'boolean' ) {
  1628. override ? showHelp() : closeOverlay();
  1629. }
  1630. else {
  1631. if( dom.overlay ) {
  1632. closeOverlay();
  1633. }
  1634. else {
  1635. showHelp();
  1636. }
  1637. }
  1638. }
  1639. /**
  1640. * Opens an overlay window with help material.
  1641. */
  1642. function showHelp() {
  1643. if( config.help ) {
  1644. closeOverlay();
  1645. dom.overlay = document.createElement( 'div' );
  1646. dom.overlay.classList.add( 'overlay' );
  1647. dom.overlay.classList.add( 'overlay-help' );
  1648. dom.wrapper.appendChild( dom.overlay );
  1649. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1650. html += '<table><th>KEY</th><th>ACTION</th>';
  1651. for( var key in keyboardShortcuts ) {
  1652. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1653. }
  1654. // Add custom key bindings that have associated descriptions
  1655. for( var binding in registeredKeyBindings ) {
  1656. if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) {
  1657. html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</td></tr>';
  1658. }
  1659. }
  1660. html += '</table>';
  1661. dom.overlay.innerHTML = [
  1662. '<header>',
  1663. '<a class="close" href="#"><span class="icon"></span></a>',
  1664. '</header>',
  1665. '<div class="viewport">',
  1666. '<div class="viewport-inner">'+ html +'</div>',
  1667. '</div>'
  1668. ].join('');
  1669. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1670. closeOverlay();
  1671. event.preventDefault();
  1672. }, false );
  1673. setTimeout( function() {
  1674. dom.overlay.classList.add( 'visible' );
  1675. }, 1 );
  1676. }
  1677. }
  1678. /**
  1679. * Closes any currently open overlay.
  1680. */
  1681. function closeOverlay() {
  1682. if( dom.overlay ) {
  1683. dom.overlay.parentNode.removeChild( dom.overlay );
  1684. dom.overlay = null;
  1685. }
  1686. }
  1687. /**
  1688. * Applies JavaScript-controlled layout rules to the
  1689. * presentation.
  1690. */
  1691. function layout() {
  1692. if( dom.wrapper && !isPrintingPDF() ) {
  1693. if( !config.disableLayout ) {
  1694. // On some mobile devices '100vh' is taller than the visible
  1695. // viewport which leads to part of the presentation being
  1696. // cut off. To work around this we define our own '--vh' custom
  1697. // property where 100x adds up to the correct height.
  1698. //
  1699. // https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
  1700. if( isMobileDevice ) {
  1701. document.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );
  1702. }
  1703. var size = getComputedSlideSize();
  1704. var oldScale = scale;
  1705. // Layout the contents of the slides
  1706. layoutSlideContents( config.width, config.height );
  1707. dom.slides.style.width = size.width + 'px';
  1708. dom.slides.style.height = size.height + 'px';
  1709. // Determine scale of content to fit within available space
  1710. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1711. // Respect max/min scale settings
  1712. scale = Math.max( scale, config.minScale );
  1713. scale = Math.min( scale, config.maxScale );
  1714. // Don't apply any scaling styles if scale is 1
  1715. if( scale === 1 ) {
  1716. dom.slides.style.zoom = '';
  1717. dom.slides.style.left = '';
  1718. dom.slides.style.top = '';
  1719. dom.slides.style.bottom = '';
  1720. dom.slides.style.right = '';
  1721. transformSlides( { layout: '' } );
  1722. }
  1723. else {
  1724. // Prefer zoom for scaling up so that content remains crisp.
  1725. // Don't use zoom to scale down since that can lead to shifts
  1726. // in text layout/line breaks.
  1727. if( scale > 1 && features.zoom ) {
  1728. dom.slides.style.zoom = scale;
  1729. dom.slides.style.left = '';
  1730. dom.slides.style.top = '';
  1731. dom.slides.style.bottom = '';
  1732. dom.slides.style.right = '';
  1733. transformSlides( { layout: '' } );
  1734. }
  1735. // Apply scale transform as a fallback
  1736. else {
  1737. dom.slides.style.zoom = '';
  1738. dom.slides.style.left = '50%';
  1739. dom.slides.style.top = '50%';
  1740. dom.slides.style.bottom = 'auto';
  1741. dom.slides.style.right = 'auto';
  1742. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1743. }
  1744. }
  1745. // Select all slides, vertical and horizontal
  1746. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1747. for( var i = 0, len = slides.length; i < len; i++ ) {
  1748. var slide = slides[ i ];
  1749. // Don't bother updating invisible slides
  1750. if( slide.style.display === 'none' ) {
  1751. continue;
  1752. }
  1753. if( config.center || slide.classList.contains( 'center' ) ) {
  1754. // Vertical stacks are not centred since their section
  1755. // children will be
  1756. if( slide.classList.contains( 'stack' ) ) {
  1757. slide.style.top = 0;
  1758. }
  1759. else {
  1760. slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
  1761. }
  1762. }
  1763. else {
  1764. slide.style.top = '';
  1765. }
  1766. }
  1767. if( oldScale !== scale ) {
  1768. dispatchEvent( 'resize', {
  1769. 'oldScale': oldScale,
  1770. 'scale': scale,
  1771. 'size': size
  1772. } );
  1773. }
  1774. }
  1775. updateProgress();
  1776. updateParallax();
  1777. if( isOverview() ) {
  1778. updateOverview();
  1779. }
  1780. }
  1781. }
  1782. /**
  1783. * Applies layout logic to the contents of all slides in
  1784. * the presentation.
  1785. *
  1786. * @param {string|number} width
  1787. * @param {string|number} height
  1788. */
  1789. function layoutSlideContents( width, height ) {
  1790. // Handle sizing of elements with the 'stretch' class
  1791. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1792. // Determine how much vertical space we can use
  1793. var remainingHeight = getRemainingHeight( element, height );
  1794. // Consider the aspect ratio of media elements
  1795. if( /(img|video)/gi.test( element.nodeName ) ) {
  1796. var nw = element.naturalWidth || element.videoWidth,
  1797. nh = element.naturalHeight || element.videoHeight;
  1798. var es = Math.min( width / nw, remainingHeight / nh );
  1799. element.style.width = ( nw * es ) + 'px';
  1800. element.style.height = ( nh * es ) + 'px';
  1801. }
  1802. else {
  1803. element.style.width = width + 'px';
  1804. element.style.height = remainingHeight + 'px';
  1805. }
  1806. } );
  1807. }
  1808. /**
  1809. * Calculates the computed pixel size of our slides. These
  1810. * values are based on the width and height configuration
  1811. * options.
  1812. *
  1813. * @param {number} [presentationWidth=dom.wrapper.offsetWidth]
  1814. * @param {number} [presentationHeight=dom.wrapper.offsetHeight]
  1815. */
  1816. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1817. var size = {
  1818. // Slide size
  1819. width: config.width,
  1820. height: config.height,
  1821. // Presentation size
  1822. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1823. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1824. };
  1825. // Reduce available space by margin
  1826. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1827. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1828. // Slide width may be a percentage of available width
  1829. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1830. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1831. }
  1832. // Slide height may be a percentage of available height
  1833. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1834. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1835. }
  1836. return size;
  1837. }
  1838. /**
  1839. * Stores the vertical index of a stack so that the same
  1840. * vertical slide can be selected when navigating to and
  1841. * from the stack.
  1842. *
  1843. * @param {HTMLElement} stack The vertical stack element
  1844. * @param {string|number} [v=0] Index to memorize
  1845. */
  1846. function setPreviousVerticalIndex( stack, v ) {
  1847. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1848. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1849. }
  1850. }
  1851. /**
  1852. * Retrieves the vertical index which was stored using
  1853. * #setPreviousVerticalIndex() or 0 if no previous index
  1854. * exists.
  1855. *
  1856. * @param {HTMLElement} stack The vertical stack element
  1857. */
  1858. function getPreviousVerticalIndex( stack ) {
  1859. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1860. // Prefer manually defined start-indexv
  1861. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1862. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1863. }
  1864. return 0;
  1865. }
  1866. /**
  1867. * Displays the overview of slides (quick nav) by scaling
  1868. * down and arranging all slide elements.
  1869. */
  1870. function activateOverview() {
  1871. // Only proceed if enabled in config
  1872. if( config.overview && !isOverview() ) {
  1873. overview = true;
  1874. dom.wrapper.classList.add( 'overview' );
  1875. dom.wrapper.classList.remove( 'overview-deactivating' );
  1876. if( features.overviewTransitions ) {
  1877. setTimeout( function() {
  1878. dom.wrapper.classList.add( 'overview-animated' );
  1879. }, 1 );
  1880. }
  1881. // Don't auto-slide while in overview mode
  1882. cancelAutoSlide();
  1883. // Move the backgrounds element into the slide container to
  1884. // that the same scaling is applied
  1885. dom.slides.appendChild( dom.background );
  1886. // Clicking on an overview slide navigates to it
  1887. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1888. if( !slide.classList.contains( 'stack' ) ) {
  1889. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1890. }
  1891. } );
  1892. // Calculate slide sizes
  1893. var margin = 70;
  1894. var slideSize = getComputedSlideSize();
  1895. overviewSlideWidth = slideSize.width + margin;
  1896. overviewSlideHeight = slideSize.height + margin;
  1897. // Reverse in RTL mode
  1898. if( config.rtl ) {
  1899. overviewSlideWidth = -overviewSlideWidth;
  1900. }
  1901. updateSlidesVisibility();
  1902. layoutOverview();
  1903. updateOverview();
  1904. layout();
  1905. // Notify observers of the overview showing
  1906. dispatchEvent( 'overviewshown', {
  1907. 'indexh': indexh,
  1908. 'indexv': indexv,
  1909. 'currentSlide': currentSlide
  1910. } );
  1911. }
  1912. }
  1913. /**
  1914. * Uses CSS transforms to position all slides in a grid for
  1915. * display inside of the overview mode.
  1916. */
  1917. function layoutOverview() {
  1918. // Layout slides
  1919. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1920. hslide.setAttribute( 'data-index-h', h );
  1921. transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1922. if( hslide.classList.contains( 'stack' ) ) {
  1923. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1924. vslide.setAttribute( 'data-index-h', h );
  1925. vslide.setAttribute( 'data-index-v', v );
  1926. transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1927. } );
  1928. }
  1929. } );
  1930. // Layout slide backgrounds
  1931. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1932. transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1933. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1934. transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1935. } );
  1936. } );
  1937. }
  1938. /**
  1939. * Moves the overview viewport to the current slides.
  1940. * Called each time the current slide changes.
  1941. */
  1942. function updateOverview() {
  1943. var vmin = Math.min( window.innerWidth, window.innerHeight );
  1944. var scale = Math.max( vmin / 5, 150 ) / vmin;
  1945. transformSlides( {
  1946. overview: [
  1947. 'scale('+ scale +')',
  1948. 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
  1949. 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)'
  1950. ].join( ' ' )
  1951. } );
  1952. }
  1953. /**
  1954. * Exits the slide overview and enters the currently
  1955. * active slide.
  1956. */
  1957. function deactivateOverview() {
  1958. // Only proceed if enabled in config
  1959. if( config.overview ) {
  1960. overview = false;
  1961. dom.wrapper.classList.remove( 'overview' );
  1962. dom.wrapper.classList.remove( 'overview-animated' );
  1963. // Temporarily add a class so that transitions can do different things
  1964. // depending on whether they are exiting/entering overview, or just
  1965. // moving from slide to slide
  1966. dom.wrapper.classList.add( 'overview-deactivating' );
  1967. setTimeout( function () {
  1968. dom.wrapper.classList.remove( 'overview-deactivating' );
  1969. }, 1 );
  1970. // Move the background element back out
  1971. dom.wrapper.appendChild( dom.background );
  1972. // Clean up changes made to slides
  1973. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1974. transformElement( slide, '' );
  1975. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1976. } );
  1977. // Clean up changes made to backgrounds
  1978. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  1979. transformElement( background, '' );
  1980. } );
  1981. transformSlides( { overview: '' } );
  1982. slide( indexh, indexv );
  1983. layout();
  1984. cueAutoSlide();
  1985. // Notify observers of the overview hiding
  1986. dispatchEvent( 'overviewhidden', {
  1987. 'indexh': indexh,
  1988. 'indexv': indexv,
  1989. 'currentSlide': currentSlide
  1990. } );
  1991. }
  1992. }
  1993. /**
  1994. * Toggles the slide overview mode on and off.
  1995. *
  1996. * @param {Boolean} [override] Flag which overrides the
  1997. * toggle logic and forcibly sets the desired state. True means
  1998. * overview is open, false means it's closed.
  1999. */
  2000. function toggleOverview( override ) {
  2001. if( typeof override === 'boolean' ) {
  2002. override ? activateOverview() : deactivateOverview();
  2003. }
  2004. else {
  2005. isOverview() ? deactivateOverview() : activateOverview();
  2006. }
  2007. }
  2008. /**
  2009. * Checks if the overview is currently active.
  2010. *
  2011. * @return {Boolean} true if the overview is active,
  2012. * false otherwise
  2013. */
  2014. function isOverview() {
  2015. return overview;
  2016. }
  2017. /**
  2018. * Return a hash URL that will resolve to the current slide location.
  2019. */
  2020. function locationHash() {
  2021. var url = '/';
  2022. // Attempt to create a named link based on the slide's ID
  2023. var id = currentSlide ? currentSlide.getAttribute( 'id' ) : null;
  2024. if( id ) {
  2025. id = encodeURIComponent( id );
  2026. }
  2027. var indexf;
  2028. if( config.fragmentInURL ) {
  2029. indexf = getIndices().f;
  2030. }
  2031. // If the current slide has an ID, use that as a named link,
  2032. // but we don't support named links with a fragment index
  2033. if( typeof id === 'string' && id.length && indexf === undefined ) {
  2034. url = '/' + id;
  2035. }
  2036. // Otherwise use the /h/v index
  2037. else {
  2038. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  2039. if( indexh > 0 || indexv > 0 || indexf !== undefined ) url += indexh + hashIndexBase;
  2040. if( indexv > 0 || indexf !== undefined ) url += '/' + (indexv + hashIndexBase );
  2041. if( indexf !== undefined ) url += '/' + indexf;
  2042. }
  2043. return url;
  2044. }
  2045. /**
  2046. * Checks if the current or specified slide is vertical
  2047. * (nested within another slide).
  2048. *
  2049. * @param {HTMLElement} [slide=currentSlide] The slide to check
  2050. * orientation of
  2051. * @return {Boolean}
  2052. */
  2053. function isVerticalSlide( slide ) {
  2054. // Prefer slide argument, otherwise use current slide
  2055. slide = slide ? slide : currentSlide;
  2056. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  2057. }
  2058. /**
  2059. * Handling the fullscreen functionality via the fullscreen API
  2060. *
  2061. * @see http://fullscreen.spec.whatwg.org/
  2062. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  2063. */
  2064. function enterFullscreen() {
  2065. var element = document.documentElement;
  2066. // Check which implementation is available
  2067. var requestMethod = element.requestFullscreen ||
  2068. element.webkitRequestFullscreen ||
  2069. element.webkitRequestFullScreen ||
  2070. element.mozRequestFullScreen ||
  2071. element.msRequestFullscreen;
  2072. if( requestMethod ) {
  2073. requestMethod.apply( element );
  2074. }
  2075. }
  2076. /**
  2077. * Shows the mouse pointer after it has been hidden with
  2078. * #hideCursor.
  2079. */
  2080. function showCursor() {
  2081. if( cursorHidden ) {
  2082. cursorHidden = false;
  2083. dom.wrapper.style.cursor = '';
  2084. }
  2085. }
  2086. /**
  2087. * Hides the mouse pointer when it's on top of the .reveal
  2088. * container.
  2089. */
  2090. function hideCursor() {
  2091. if( cursorHidden === false ) {
  2092. cursorHidden = true;
  2093. dom.wrapper.style.cursor = 'none';
  2094. }
  2095. }
  2096. /**
  2097. * Enters the paused mode which fades everything on screen to
  2098. * black.
  2099. */
  2100. function pause() {
  2101. if( config.pause ) {
  2102. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2103. cancelAutoSlide();
  2104. dom.wrapper.classList.add( 'paused' );
  2105. if( wasPaused === false ) {
  2106. dispatchEvent( 'paused' );
  2107. }
  2108. }
  2109. }
  2110. /**
  2111. * Exits from the paused mode.
  2112. */
  2113. function resume() {
  2114. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2115. dom.wrapper.classList.remove( 'paused' );
  2116. cueAutoSlide();
  2117. if( wasPaused ) {
  2118. dispatchEvent( 'resumed' );
  2119. }
  2120. }
  2121. /**
  2122. * Toggles the paused mode on and off.
  2123. */
  2124. function togglePause( override ) {
  2125. if( typeof override === 'boolean' ) {
  2126. override ? pause() : resume();
  2127. }
  2128. else {
  2129. isPaused() ? resume() : pause();
  2130. }
  2131. }
  2132. /**
  2133. * Checks if we are currently in the paused mode.
  2134. *
  2135. * @return {Boolean}
  2136. */
  2137. function isPaused() {
  2138. return dom.wrapper.classList.contains( 'paused' );
  2139. }
  2140. /**
  2141. * Toggles the auto slide mode on and off.
  2142. *
  2143. * @param {Boolean} [override] Flag which sets the desired state.
  2144. * True means autoplay starts, false means it stops.
  2145. */
  2146. function toggleAutoSlide( override ) {
  2147. if( typeof override === 'boolean' ) {
  2148. override ? resumeAutoSlide() : pauseAutoSlide();
  2149. }
  2150. else {
  2151. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  2152. }
  2153. }
  2154. /**
  2155. * Checks if the auto slide mode is currently on.
  2156. *
  2157. * @return {Boolean}
  2158. */
  2159. function isAutoSliding() {
  2160. return !!( autoSlide && !autoSlidePaused );
  2161. }
  2162. /**
  2163. * Steps from the current point in the presentation to the
  2164. * slide which matches the specified horizontal and vertical
  2165. * indices.
  2166. *
  2167. * @param {number} [h=indexh] Horizontal index of the target slide
  2168. * @param {number} [v=indexv] Vertical index of the target slide
  2169. * @param {number} [f] Index of a fragment within the
  2170. * target slide to activate
  2171. * @param {number} [o] Origin for use in multimaster environments
  2172. */
  2173. function slide( h, v, f, o ) {
  2174. // Remember where we were at before
  2175. previousSlide = currentSlide;
  2176. // Query all horizontal slides in the deck
  2177. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  2178. // Abort if there are no slides
  2179. if( horizontalSlides.length === 0 ) return;
  2180. // If no vertical index is specified and the upcoming slide is a
  2181. // stack, resume at its previous vertical index
  2182. if( v === undefined && !isOverview() ) {
  2183. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  2184. }
  2185. // If we were on a vertical stack, remember what vertical index
  2186. // it was on so we can resume at the same position when returning
  2187. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  2188. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  2189. }
  2190. // Remember the state before this slide
  2191. var stateBefore = state.concat();
  2192. // Reset the state array
  2193. state.length = 0;
  2194. var indexhBefore = indexh || 0,
  2195. indexvBefore = indexv || 0;
  2196. // Activate and transition to the new slide
  2197. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  2198. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  2199. // Update the visibility of slides now that the indices have changed
  2200. updateSlidesVisibility();
  2201. layout();
  2202. // Update the overview if it's currently active
  2203. if( isOverview() ) {
  2204. updateOverview();
  2205. }
  2206. // Find the current horizontal slide and any possible vertical slides
  2207. // within it
  2208. var currentHorizontalSlide = horizontalSlides[ indexh ],
  2209. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  2210. // Store references to the previous and current slides
  2211. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  2212. // Show fragment, if specified
  2213. if( typeof f !== 'undefined' ) {
  2214. navigateFragment( f );
  2215. }
  2216. // Dispatch an event if the slide changed
  2217. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  2218. if (!slideChanged) {
  2219. // Ensure that the previous slide is never the same as the current
  2220. previousSlide = null;
  2221. }
  2222. // Solves an edge case where the previous slide maintains the
  2223. // 'present' class when navigating between adjacent vertical
  2224. // stacks
  2225. if( previousSlide && previousSlide !== currentSlide ) {
  2226. previousSlide.classList.remove( 'present' );
  2227. previousSlide.setAttribute( 'aria-hidden', 'true' );
  2228. // Reset all slides upon navigate to home
  2229. // Issue: #285
  2230. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  2231. // Launch async task
  2232. setTimeout( function () {
  2233. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  2234. for( i in slides ) {
  2235. if( slides[i] ) {
  2236. // Reset stack
  2237. setPreviousVerticalIndex( slides[i], 0 );
  2238. }
  2239. }
  2240. }, 0 );
  2241. }
  2242. }
  2243. // Apply the new state
  2244. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  2245. // Check if this state existed on the previous slide. If it
  2246. // did, we will avoid adding it repeatedly
  2247. for( var j = 0; j < stateBefore.length; j++ ) {
  2248. if( stateBefore[j] === state[i] ) {
  2249. stateBefore.splice( j, 1 );
  2250. continue stateLoop;
  2251. }
  2252. }
  2253. document.documentElement.classList.add( state[i] );
  2254. // Dispatch custom event matching the state's name
  2255. dispatchEvent( state[i] );
  2256. }
  2257. // Clean up the remains of the previous state
  2258. while( stateBefore.length ) {
  2259. document.documentElement.classList.remove( stateBefore.pop() );
  2260. }
  2261. if( slideChanged ) {
  2262. dispatchEvent( 'slidechanged', {
  2263. 'indexh': indexh,
  2264. 'indexv': indexv,
  2265. 'previousSlide': previousSlide,
  2266. 'currentSlide': currentSlide,
  2267. 'origin': o
  2268. } );
  2269. }
  2270. // Handle embedded content
  2271. if( slideChanged || !previousSlide ) {
  2272. stopEmbeddedContent( previousSlide );
  2273. startEmbeddedContent( currentSlide );
  2274. }
  2275. // Announce the current slide contents, for screen readers
  2276. dom.statusDiv.textContent = getStatusText( currentSlide );
  2277. updateControls();
  2278. updateProgress();
  2279. updateBackground();
  2280. updateParallax();
  2281. updateSlideNumber();
  2282. updateNotes();
  2283. updateFragments();
  2284. // Update the URL hash
  2285. writeURL();
  2286. cueAutoSlide();
  2287. }
  2288. /**
  2289. * Syncs the presentation with the current DOM. Useful
  2290. * when new slides or control elements are added or when
  2291. * the configuration has changed.
  2292. */
  2293. function sync() {
  2294. // Subscribe to input
  2295. removeEventListeners();
  2296. addEventListeners();
  2297. // Force a layout to make sure the current config is accounted for
  2298. layout();
  2299. // Reflect the current autoSlide value
  2300. autoSlide = config.autoSlide;
  2301. // Start auto-sliding if it's enabled
  2302. cueAutoSlide();
  2303. // Re-create the slide backgrounds
  2304. createBackgrounds();
  2305. // Write the current hash to the URL
  2306. writeURL();
  2307. sortAllFragments();
  2308. updateControls();
  2309. updateProgress();
  2310. updateSlideNumber();
  2311. updateSlidesVisibility();
  2312. updateBackground( true );
  2313. updateNotesVisibility();
  2314. updateNotes();
  2315. formatEmbeddedContent();
  2316. // Start or stop embedded content depending on global config
  2317. if( config.autoPlayMedia === false ) {
  2318. stopEmbeddedContent( currentSlide, { unloadIframes: false } );
  2319. }
  2320. else {
  2321. startEmbeddedContent( currentSlide );
  2322. }
  2323. if( isOverview() ) {
  2324. layoutOverview();
  2325. }
  2326. }
  2327. /**
  2328. * Updates reveal.js to keep in sync with new slide attributes. For
  2329. * example, if you add a new `data-background-image` you can call
  2330. * this to have reveal.js render the new background image.
  2331. *
  2332. * Similar to #sync() but more efficient when you only need to
  2333. * refresh a specific slide.
  2334. *
  2335. * @param {HTMLElement} slide
  2336. */
  2337. function syncSlide( slide ) {
  2338. // Default to the current slide
  2339. slide = slide || currentSlide;
  2340. syncBackground( slide );
  2341. syncFragments( slide );
  2342. updateBackground();
  2343. updateNotes();
  2344. loadSlide( slide );
  2345. }
  2346. /**
  2347. * Formats the fragments on the given slide so that they have
  2348. * valid indices. Call this if fragments are changed in the DOM
  2349. * after reveal.js has already initialized.
  2350. *
  2351. * @param {HTMLElement} slide
  2352. * @return {Array} a list of the HTML fragments that were synced
  2353. */
  2354. function syncFragments( slide ) {
  2355. // Default to the current slide
  2356. slide = slide || currentSlide;
  2357. return sortFragments( slide.querySelectorAll( '.fragment' ) );
  2358. }
  2359. /**
  2360. * Resets all vertical slides so that only the first
  2361. * is visible.
  2362. */
  2363. function resetVerticalSlides() {
  2364. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2365. horizontalSlides.forEach( function( horizontalSlide ) {
  2366. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2367. verticalSlides.forEach( function( verticalSlide, y ) {
  2368. if( y > 0 ) {
  2369. verticalSlide.classList.remove( 'present' );
  2370. verticalSlide.classList.remove( 'past' );
  2371. verticalSlide.classList.add( 'future' );
  2372. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  2373. }
  2374. } );
  2375. } );
  2376. }
  2377. /**
  2378. * Sorts and formats all of fragments in the
  2379. * presentation.
  2380. */
  2381. function sortAllFragments() {
  2382. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2383. horizontalSlides.forEach( function( horizontalSlide ) {
  2384. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2385. verticalSlides.forEach( function( verticalSlide, y ) {
  2386. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  2387. } );
  2388. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  2389. } );
  2390. }
  2391. /**
  2392. * Randomly shuffles all slides in the deck.
  2393. */
  2394. function shuffle() {
  2395. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2396. slides.forEach( function( slide ) {
  2397. // Insert this slide next to another random slide. This may
  2398. // cause the slide to insert before itself but that's fine.
  2399. dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
  2400. } );
  2401. }
  2402. /**
  2403. * Updates one dimension of slides by showing the slide
  2404. * with the specified index.
  2405. *
  2406. * @param {string} selector A CSS selector that will fetch
  2407. * the group of slides we are working with
  2408. * @param {number} index The index of the slide that should be
  2409. * shown
  2410. *
  2411. * @return {number} The index of the slide that is now shown,
  2412. * might differ from the passed in index if it was out of
  2413. * bounds.
  2414. */
  2415. function updateSlides( selector, index ) {
  2416. // Select all slides and convert the NodeList result to
  2417. // an array
  2418. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  2419. slidesLength = slides.length;
  2420. var printMode = isPrintingPDF();
  2421. if( slidesLength ) {
  2422. // Should the index loop?
  2423. if( config.loop ) {
  2424. index %= slidesLength;
  2425. if( index < 0 ) {
  2426. index = slidesLength + index;
  2427. }
  2428. }
  2429. // Enforce max and minimum index bounds
  2430. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  2431. for( var i = 0; i < slidesLength; i++ ) {
  2432. var element = slides[i];
  2433. var reverse = config.rtl && !isVerticalSlide( element );
  2434. element.classList.remove( 'past' );
  2435. element.classList.remove( 'present' );
  2436. element.classList.remove( 'future' );
  2437. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  2438. element.setAttribute( 'hidden', '' );
  2439. element.setAttribute( 'aria-hidden', 'true' );
  2440. // If this element contains vertical slides
  2441. if( element.querySelector( 'section' ) ) {
  2442. element.classList.add( 'stack' );
  2443. }
  2444. // If we're printing static slides, all slides are "present"
  2445. if( printMode ) {
  2446. element.classList.add( 'present' );
  2447. continue;
  2448. }
  2449. if( i < index ) {
  2450. // Any element previous to index is given the 'past' class
  2451. element.classList.add( reverse ? 'future' : 'past' );
  2452. if( config.fragments ) {
  2453. // Show all fragments in prior slides
  2454. toArray( element.querySelectorAll( '.fragment' ) ).forEach( function( fragment ) {
  2455. fragment.classList.add( 'visible' );
  2456. fragment.classList.remove( 'current-fragment' );
  2457. } );
  2458. }
  2459. }
  2460. else if( i > index ) {
  2461. // Any element subsequent to index is given the 'future' class
  2462. element.classList.add( reverse ? 'past' : 'future' );
  2463. if( config.fragments ) {
  2464. // Hide all fragments in future slides
  2465. toArray( element.querySelectorAll( '.fragment.visible' ) ).forEach( function( fragment ) {
  2466. fragment.classList.remove( 'visible' );
  2467. fragment.classList.remove( 'current-fragment' );
  2468. } );
  2469. }
  2470. }
  2471. }
  2472. // Mark the current slide as present
  2473. slides[index].classList.add( 'present' );
  2474. slides[index].removeAttribute( 'hidden' );
  2475. slides[index].removeAttribute( 'aria-hidden' );
  2476. // If this slide has a state associated with it, add it
  2477. // onto the current state of the deck
  2478. var slideState = slides[index].getAttribute( 'data-state' );
  2479. if( slideState ) {
  2480. state = state.concat( slideState.split( ' ' ) );
  2481. }
  2482. }
  2483. else {
  2484. // Since there are no slides we can't be anywhere beyond the
  2485. // zeroth index
  2486. index = 0;
  2487. }
  2488. return index;
  2489. }
  2490. /**
  2491. * Optimization method; hide all slides that are far away
  2492. * from the present slide.
  2493. */
  2494. function updateSlidesVisibility() {
  2495. // Select all slides and convert the NodeList result to
  2496. // an array
  2497. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  2498. horizontalSlidesLength = horizontalSlides.length,
  2499. distanceX,
  2500. distanceY;
  2501. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  2502. // The number of steps away from the present slide that will
  2503. // be visible
  2504. var viewDistance = isOverview() ? 10 : config.viewDistance;
  2505. // Limit view distance on weaker devices
  2506. if( isMobileDevice ) {
  2507. viewDistance = isOverview() ? 6 : 2;
  2508. }
  2509. // All slides need to be visible when exporting to PDF
  2510. if( isPrintingPDF() ) {
  2511. viewDistance = Number.MAX_VALUE;
  2512. }
  2513. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  2514. var horizontalSlide = horizontalSlides[x];
  2515. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  2516. verticalSlidesLength = verticalSlides.length;
  2517. // Determine how far away this slide is from the present
  2518. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  2519. // If the presentation is looped, distance should measure
  2520. // 1 between the first and last slides
  2521. if( config.loop ) {
  2522. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  2523. }
  2524. // Show the horizontal slide if it's within the view distance
  2525. if( distanceX < viewDistance ) {
  2526. loadSlide( horizontalSlide );
  2527. }
  2528. else {
  2529. unloadSlide( horizontalSlide );
  2530. }
  2531. if( verticalSlidesLength ) {
  2532. var oy = getPreviousVerticalIndex( horizontalSlide );
  2533. for( var y = 0; y < verticalSlidesLength; y++ ) {
  2534. var verticalSlide = verticalSlides[y];
  2535. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  2536. if( distanceX + distanceY < viewDistance ) {
  2537. loadSlide( verticalSlide );
  2538. }
  2539. else {
  2540. unloadSlide( verticalSlide );
  2541. }
  2542. }
  2543. }
  2544. }
  2545. // Flag if there are ANY vertical slides, anywhere in the deck
  2546. if( dom.wrapper.querySelectorAll( '.slides>section>section' ).length ) {
  2547. dom.wrapper.classList.add( 'has-vertical-slides' );
  2548. }
  2549. else {
  2550. dom.wrapper.classList.remove( 'has-vertical-slides' );
  2551. }
  2552. // Flag if there are ANY horizontal slides, anywhere in the deck
  2553. if( dom.wrapper.querySelectorAll( '.slides>section' ).length > 1 ) {
  2554. dom.wrapper.classList.add( 'has-horizontal-slides' );
  2555. }
  2556. else {
  2557. dom.wrapper.classList.remove( 'has-horizontal-slides' );
  2558. }
  2559. }
  2560. }
  2561. /**
  2562. * Pick up notes from the current slide and display them
  2563. * to the viewer.
  2564. *
  2565. * @see {@link config.showNotes}
  2566. */
  2567. function updateNotes() {
  2568. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  2569. dom.speakerNotes.innerHTML = getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
  2570. }
  2571. }
  2572. /**
  2573. * Updates the visibility of the speaker notes sidebar that
  2574. * is used to share annotated slides. The notes sidebar is
  2575. * only visible if showNotes is true and there are notes on
  2576. * one or more slides in the deck.
  2577. */
  2578. function updateNotesVisibility() {
  2579. if( config.showNotes && hasNotes() ) {
  2580. dom.wrapper.classList.add( 'show-notes' );
  2581. }
  2582. else {
  2583. dom.wrapper.classList.remove( 'show-notes' );
  2584. }
  2585. }
  2586. /**
  2587. * Checks if there are speaker notes for ANY slide in the
  2588. * presentation.
  2589. */
  2590. function hasNotes() {
  2591. return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0;
  2592. }
  2593. /**
  2594. * Updates the progress bar to reflect the current slide.
  2595. */
  2596. function updateProgress() {
  2597. // Update progress if enabled
  2598. if( config.progress && dom.progressbar ) {
  2599. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  2600. }
  2601. }
  2602. /**
  2603. * Updates the slide number to match the current slide.
  2604. */
  2605. function updateSlideNumber() {
  2606. // Update slide number if enabled
  2607. if( config.slideNumber && dom.slideNumber ) {
  2608. var value;
  2609. var format = 'h.v';
  2610. if( typeof config.slideNumber === 'function' ) {
  2611. value = config.slideNumber();
  2612. }
  2613. else {
  2614. // Check if a custom number format is available
  2615. if( typeof config.slideNumber === 'string' ) {
  2616. format = config.slideNumber;
  2617. }
  2618. // If there are ONLY vertical slides in this deck, always use
  2619. // a flattened slide number
  2620. if( !/c/.test( format ) && dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length === 1 ) {
  2621. format = 'c';
  2622. }
  2623. value = [];
  2624. switch( format ) {
  2625. case 'c':
  2626. value.push( getSlidePastCount() + 1 );
  2627. break;
  2628. case 'c/t':
  2629. value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
  2630. break;
  2631. case 'h/v':
  2632. value.push( indexh + 1 );
  2633. if( isVerticalSlide() ) value.push( '/', indexv + 1 );
  2634. break;
  2635. default:
  2636. value.push( indexh + 1 );
  2637. if( isVerticalSlide() ) value.push( '.', indexv + 1 );
  2638. }
  2639. }
  2640. dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
  2641. }
  2642. }
  2643. /**
  2644. * Applies HTML formatting to a slide number before it's
  2645. * written to the DOM.
  2646. *
  2647. * @param {number} a Current slide
  2648. * @param {string} delimiter Character to separate slide numbers
  2649. * @param {(number|*)} b Total slides
  2650. * @return {string} HTML string fragment
  2651. */
  2652. function formatSlideNumber( a, delimiter, b ) {
  2653. var url = '#' + locationHash();
  2654. if( typeof b === 'number' && !isNaN( b ) ) {
  2655. return '<a href="' + url + '">' +
  2656. '<span class="slide-number-a">'+ a +'</span>' +
  2657. '<span class="slide-number-delimiter">'+ delimiter +'</span>' +
  2658. '<span class="slide-number-b">'+ b +'</span>' +
  2659. '</a>';
  2660. }
  2661. else {
  2662. return '<a href="' + url + '">' +
  2663. '<span class="slide-number-a">'+ a +'</span>' +
  2664. '</a>';
  2665. }
  2666. }
  2667. /**
  2668. * Updates the state of all control/navigation arrows.
  2669. */
  2670. function updateControls() {
  2671. var routes = availableRoutes();
  2672. var fragments = availableFragments();
  2673. // Remove the 'enabled' class from all directions
  2674. dom.controlsLeft.concat( dom.controlsRight )
  2675. .concat( dom.controlsUp )
  2676. .concat( dom.controlsDown )
  2677. .concat( dom.controlsPrev )
  2678. .concat( dom.controlsNext ).forEach( function( node ) {
  2679. node.classList.remove( 'enabled' );
  2680. node.classList.remove( 'fragmented' );
  2681. // Set 'disabled' attribute on all directions
  2682. node.setAttribute( 'disabled', 'disabled' );
  2683. } );
  2684. // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
  2685. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2686. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2687. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2688. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2689. // Prev/next buttons
  2690. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2691. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2692. // Highlight fragment directions
  2693. if( currentSlide ) {
  2694. // Always apply fragment decorator to prev/next buttons
  2695. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2696. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2697. // Apply fragment decorators to directional buttons based on
  2698. // what slide axis they are in
  2699. if( isVerticalSlide( currentSlide ) ) {
  2700. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2701. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2702. }
  2703. else {
  2704. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2705. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2706. }
  2707. }
  2708. if( config.controlsTutorial ) {
  2709. // Highlight control arrows with an animation to ensure
  2710. // that the viewer knows how to navigate
  2711. if( !hasNavigatedDown && routes.down ) {
  2712. dom.controlsDownArrow.classList.add( 'highlight' );
  2713. }
  2714. else {
  2715. dom.controlsDownArrow.classList.remove( 'highlight' );
  2716. if( !hasNavigatedRight && routes.right && indexv === 0 ) {
  2717. dom.controlsRightArrow.classList.add( 'highlight' );
  2718. }
  2719. else {
  2720. dom.controlsRightArrow.classList.remove( 'highlight' );
  2721. }
  2722. }
  2723. }
  2724. }
  2725. /**
  2726. * Updates the background elements to reflect the current
  2727. * slide.
  2728. *
  2729. * @param {boolean} includeAll If true, the backgrounds of
  2730. * all vertical slides (not just the present) will be updated.
  2731. */
  2732. function updateBackground( includeAll ) {
  2733. var currentBackground = null;
  2734. // Reverse past/future classes when in RTL mode
  2735. var horizontalPast = config.rtl ? 'future' : 'past',
  2736. horizontalFuture = config.rtl ? 'past' : 'future';
  2737. // Update the classes of all backgrounds to match the
  2738. // states of their slides (past/present/future)
  2739. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2740. backgroundh.classList.remove( 'past' );
  2741. backgroundh.classList.remove( 'present' );
  2742. backgroundh.classList.remove( 'future' );
  2743. if( h < indexh ) {
  2744. backgroundh.classList.add( horizontalPast );
  2745. }
  2746. else if ( h > indexh ) {
  2747. backgroundh.classList.add( horizontalFuture );
  2748. }
  2749. else {
  2750. backgroundh.classList.add( 'present' );
  2751. // Store a reference to the current background element
  2752. currentBackground = backgroundh;
  2753. }
  2754. if( includeAll || h === indexh ) {
  2755. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2756. backgroundv.classList.remove( 'past' );
  2757. backgroundv.classList.remove( 'present' );
  2758. backgroundv.classList.remove( 'future' );
  2759. if( v < indexv ) {
  2760. backgroundv.classList.add( 'past' );
  2761. }
  2762. else if ( v > indexv ) {
  2763. backgroundv.classList.add( 'future' );
  2764. }
  2765. else {
  2766. backgroundv.classList.add( 'present' );
  2767. // Only if this is the present horizontal and vertical slide
  2768. if( h === indexh ) currentBackground = backgroundv;
  2769. }
  2770. } );
  2771. }
  2772. } );
  2773. // Stop content inside of previous backgrounds
  2774. if( previousBackground ) {
  2775. stopEmbeddedContent( previousBackground );
  2776. }
  2777. // Start content in the current background
  2778. if( currentBackground ) {
  2779. startEmbeddedContent( currentBackground );
  2780. var currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
  2781. if( currentBackgroundContent ) {
  2782. var backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';
  2783. // Restart GIFs (doesn't work in Firefox)
  2784. if( /\.gif/i.test( backgroundImageURL ) ) {
  2785. currentBackgroundContent.style.backgroundImage = '';
  2786. window.getComputedStyle( currentBackgroundContent ).opacity;
  2787. currentBackgroundContent.style.backgroundImage = backgroundImageURL;
  2788. }
  2789. }
  2790. // Don't transition between identical backgrounds. This
  2791. // prevents unwanted flicker.
  2792. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2793. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2794. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2795. dom.background.classList.add( 'no-transition' );
  2796. }
  2797. previousBackground = currentBackground;
  2798. }
  2799. // If there's a background brightness flag for this slide,
  2800. // bubble it to the .reveal container
  2801. if( currentSlide ) {
  2802. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2803. if( currentSlide.classList.contains( classToBubble ) ) {
  2804. dom.wrapper.classList.add( classToBubble );
  2805. }
  2806. else {
  2807. dom.wrapper.classList.remove( classToBubble );
  2808. }
  2809. } );
  2810. }
  2811. // Allow the first background to apply without transition
  2812. setTimeout( function() {
  2813. dom.background.classList.remove( 'no-transition' );
  2814. }, 1 );
  2815. }
  2816. /**
  2817. * Updates the position of the parallax background based
  2818. * on the current slide index.
  2819. */
  2820. function updateParallax() {
  2821. if( config.parallaxBackgroundImage ) {
  2822. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2823. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2824. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2825. backgroundWidth, backgroundHeight;
  2826. if( backgroundSize.length === 1 ) {
  2827. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2828. }
  2829. else {
  2830. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2831. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2832. }
  2833. var slideWidth = dom.background.offsetWidth,
  2834. horizontalSlideCount = horizontalSlides.length,
  2835. horizontalOffsetMultiplier,
  2836. horizontalOffset;
  2837. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2838. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2839. }
  2840. else {
  2841. horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
  2842. }
  2843. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2844. var slideHeight = dom.background.offsetHeight,
  2845. verticalSlideCount = verticalSlides.length,
  2846. verticalOffsetMultiplier,
  2847. verticalOffset;
  2848. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2849. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2850. }
  2851. else {
  2852. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2853. }
  2854. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0;
  2855. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2856. }
  2857. }
  2858. /**
  2859. * Called when the given slide is within the configured view
  2860. * distance. Shows the slide element and loads any content
  2861. * that is set to load lazily (data-src).
  2862. *
  2863. * @param {HTMLElement} slide Slide to show
  2864. */
  2865. function loadSlide( slide, options ) {
  2866. options = options || {};
  2867. // Show the slide element
  2868. slide.style.display = config.display;
  2869. // Media elements with data-src attributes
  2870. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) {
  2871. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2872. element.setAttribute( 'data-lazy-loaded', '' );
  2873. element.removeAttribute( 'data-src' );
  2874. } );
  2875. // Media elements with <source> children
  2876. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2877. var sources = 0;
  2878. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2879. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2880. source.removeAttribute( 'data-src' );
  2881. source.setAttribute( 'data-lazy-loaded', '' );
  2882. sources += 1;
  2883. } );
  2884. // If we rewrote sources for this video/audio element, we need
  2885. // to manually tell it to load from its new origin
  2886. if( sources > 0 ) {
  2887. media.load();
  2888. }
  2889. } );
  2890. // Show the corresponding background element
  2891. var background = slide.slideBackgroundElement;
  2892. if( background ) {
  2893. background.style.display = 'block';
  2894. var backgroundContent = slide.slideBackgroundContentElement;
  2895. // If the background contains media, load it
  2896. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2897. background.setAttribute( 'data-loaded', 'true' );
  2898. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2899. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2900. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2901. backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ),
  2902. backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2903. // Images
  2904. if( backgroundImage ) {
  2905. backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')';
  2906. }
  2907. // Videos
  2908. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2909. var video = document.createElement( 'video' );
  2910. if( backgroundVideoLoop ) {
  2911. video.setAttribute( 'loop', '' );
  2912. }
  2913. if( backgroundVideoMuted ) {
  2914. video.muted = true;
  2915. }
  2916. // Inline video playback works (at least in Mobile Safari) as
  2917. // long as the video is muted and the `playsinline` attribute is
  2918. // present
  2919. if( isMobileDevice ) {
  2920. video.muted = true;
  2921. video.autoplay = true;
  2922. video.setAttribute( 'playsinline', '' );
  2923. }
  2924. // Support comma separated lists of video sources
  2925. backgroundVideo.split( ',' ).forEach( function( source ) {
  2926. video.innerHTML += '<source src="'+ source +'">';
  2927. } );
  2928. backgroundContent.appendChild( video );
  2929. }
  2930. // Iframes
  2931. else if( backgroundIframe && options.excludeIframes !== true ) {
  2932. var iframe = document.createElement( 'iframe' );
  2933. iframe.setAttribute( 'allowfullscreen', '' );
  2934. iframe.setAttribute( 'mozallowfullscreen', '' );
  2935. iframe.setAttribute( 'webkitallowfullscreen', '' );
  2936. // Only load autoplaying content when the slide is shown to
  2937. // avoid having it play in the background
  2938. if( /autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
  2939. iframe.setAttribute( 'data-src', backgroundIframe );
  2940. }
  2941. else {
  2942. iframe.setAttribute( 'src', backgroundIframe );
  2943. }
  2944. iframe.style.width = '100%';
  2945. iframe.style.height = '100%';
  2946. iframe.style.maxHeight = '100%';
  2947. iframe.style.maxWidth = '100%';
  2948. backgroundContent.appendChild( iframe );
  2949. }
  2950. }
  2951. }
  2952. }
  2953. /**
  2954. * Unloads and hides the given slide. This is called when the
  2955. * slide is moved outside of the configured view distance.
  2956. *
  2957. * @param {HTMLElement} slide
  2958. */
  2959. function unloadSlide( slide ) {
  2960. // Hide the slide element
  2961. slide.style.display = 'none';
  2962. // Hide the corresponding background element
  2963. var background = getSlideBackground( slide );
  2964. if( background ) {
  2965. background.style.display = 'none';
  2966. }
  2967. // Reset lazy-loaded media elements with src attributes
  2968. toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src]' ) ).forEach( function( element ) {
  2969. element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
  2970. element.removeAttribute( 'src' );
  2971. } );
  2972. // Reset lazy-loaded media elements with <source> children
  2973. toArray( slide.querySelectorAll( 'video[data-lazy-loaded] source[src], audio source[src]' ) ).forEach( function( source ) {
  2974. source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
  2975. source.removeAttribute( 'src' );
  2976. } );
  2977. }
  2978. /**
  2979. * Determine what available routes there are for navigation.
  2980. *
  2981. * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
  2982. */
  2983. function availableRoutes() {
  2984. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2985. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2986. var routes = {
  2987. left: indexh > 0,
  2988. right: indexh < horizontalSlides.length - 1,
  2989. up: indexv > 0,
  2990. down: indexv < verticalSlides.length - 1
  2991. };
  2992. // Looped presentations can always be navigated as long as
  2993. // there are slides available
  2994. if( config.loop ) {
  2995. if( horizontalSlides.length > 1 ) {
  2996. routes.left = true;
  2997. routes.right = true;
  2998. }
  2999. if( verticalSlides.length > 1 ) {
  3000. routes.up = true;
  3001. routes.down = true;
  3002. }
  3003. }
  3004. // Reverse horizontal controls for rtl
  3005. if( config.rtl ) {
  3006. var left = routes.left;
  3007. routes.left = routes.right;
  3008. routes.right = left;
  3009. }
  3010. return routes;
  3011. }
  3012. /**
  3013. * Returns an object describing the available fragment
  3014. * directions.
  3015. *
  3016. * @return {{prev: boolean, next: boolean}}
  3017. */
  3018. function availableFragments() {
  3019. if( currentSlide && config.fragments ) {
  3020. var fragments = currentSlide.querySelectorAll( '.fragment' );
  3021. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  3022. return {
  3023. prev: fragments.length - hiddenFragments.length > 0,
  3024. next: !!hiddenFragments.length
  3025. };
  3026. }
  3027. else {
  3028. return { prev: false, next: false };
  3029. }
  3030. }
  3031. /**
  3032. * Enforces origin-specific format rules for embedded media.
  3033. */
  3034. function formatEmbeddedContent() {
  3035. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  3036. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  3037. var src = el.getAttribute( sourceAttribute );
  3038. if( src && src.indexOf( param ) === -1 ) {
  3039. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  3040. }
  3041. });
  3042. };
  3043. // YouTube frames must include "?enablejsapi=1"
  3044. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  3045. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  3046. // Vimeo frames must include "?api=1"
  3047. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  3048. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  3049. }
  3050. /**
  3051. * Start playback of any embedded content inside of
  3052. * the given element.
  3053. *
  3054. * @param {HTMLElement} element
  3055. */
  3056. function startEmbeddedContent( element ) {
  3057. if( element && !isSpeakerNotes() ) {
  3058. // Restart GIFs
  3059. toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  3060. // Setting the same unchanged source like this was confirmed
  3061. // to work in Chrome, FF & Safari
  3062. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  3063. } );
  3064. // HTML5 media elements
  3065. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3066. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3067. return;
  3068. }
  3069. // Prefer an explicit global autoplay setting
  3070. var autoplay = config.autoPlayMedia;
  3071. // If no global setting is available, fall back on the element's
  3072. // own autoplay setting
  3073. if( typeof autoplay !== 'boolean' ) {
  3074. autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
  3075. }
  3076. if( autoplay && typeof el.play === 'function' ) {
  3077. // If the media is ready, start playback
  3078. if( el.readyState > 1 ) {
  3079. startEmbeddedMedia( { target: el } );
  3080. }
  3081. // Mobile devices never fire a loaded event so instead
  3082. // of waiting, we initiate playback
  3083. else if( isMobileDevice ) {
  3084. var promise = el.play();
  3085. // If autoplay does not work, ensure that the controls are visible so
  3086. // that the viewer can start the media on their own
  3087. if( promise && typeof promise.catch === 'function' && el.controls === false ) {
  3088. promise.catch( function() {
  3089. el.controls = true;
  3090. // Once the video does start playing, hide the controls again
  3091. el.addEventListener( 'play', function() {
  3092. el.controls = false;
  3093. } );
  3094. } );
  3095. }
  3096. }
  3097. // If the media isn't loaded, wait before playing
  3098. else {
  3099. el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes
  3100. el.addEventListener( 'loadeddata', startEmbeddedMedia );
  3101. }
  3102. }
  3103. } );
  3104. // Normal iframes
  3105. toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  3106. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3107. return;
  3108. }
  3109. startEmbeddedIframe( { target: el } );
  3110. } );
  3111. // Lazy loading iframes
  3112. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3113. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3114. return;
  3115. }
  3116. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  3117. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  3118. el.addEventListener( 'load', startEmbeddedIframe );
  3119. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  3120. }
  3121. } );
  3122. }
  3123. }
  3124. /**
  3125. * Starts playing an embedded video/audio element after
  3126. * it has finished loading.
  3127. *
  3128. * @param {object} event
  3129. */
  3130. function startEmbeddedMedia( event ) {
  3131. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3132. isVisible = !!closestParent( event.target, '.present' );
  3133. if( isAttachedToDOM && isVisible ) {
  3134. event.target.currentTime = 0;
  3135. event.target.play();
  3136. }
  3137. event.target.removeEventListener( 'loadeddata', startEmbeddedMedia );
  3138. }
  3139. /**
  3140. * "Starts" the content of an embedded iframe using the
  3141. * postMessage API.
  3142. *
  3143. * @param {object} event
  3144. */
  3145. function startEmbeddedIframe( event ) {
  3146. var iframe = event.target;
  3147. if( iframe && iframe.contentWindow ) {
  3148. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3149. isVisible = !!closestParent( event.target, '.present' );
  3150. if( isAttachedToDOM && isVisible ) {
  3151. // Prefer an explicit global autoplay setting
  3152. var autoplay = config.autoPlayMedia;
  3153. // If no global setting is available, fall back on the element's
  3154. // own autoplay setting
  3155. if( typeof autoplay !== 'boolean' ) {
  3156. autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
  3157. }
  3158. // YouTube postMessage API
  3159. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3160. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  3161. }
  3162. // Vimeo postMessage API
  3163. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3164. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  3165. }
  3166. // Generic postMessage API
  3167. else {
  3168. iframe.contentWindow.postMessage( 'slide:start', '*' );
  3169. }
  3170. }
  3171. }
  3172. }
  3173. /**
  3174. * Stop playback of any embedded content inside of
  3175. * the targeted slide.
  3176. *
  3177. * @param {HTMLElement} element
  3178. */
  3179. function stopEmbeddedContent( element, options ) {
  3180. options = extend( {
  3181. // Defaults
  3182. unloadIframes: true
  3183. }, options || {} );
  3184. if( element && element.parentNode ) {
  3185. // HTML5 media elements
  3186. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3187. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  3188. el.setAttribute('data-paused-by-reveal', '');
  3189. el.pause();
  3190. }
  3191. } );
  3192. // Generic postMessage API for non-lazy loaded iframes
  3193. toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  3194. if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
  3195. el.removeEventListener( 'load', startEmbeddedIframe );
  3196. });
  3197. // YouTube postMessage API
  3198. toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  3199. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3200. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  3201. }
  3202. });
  3203. // Vimeo postMessage API
  3204. toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  3205. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3206. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  3207. }
  3208. });
  3209. if( options.unloadIframes === true ) {
  3210. // Unload lazy-loaded iframes
  3211. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3212. // Only removing the src doesn't actually unload the frame
  3213. // in all browsers (Firefox) so we set it to blank first
  3214. el.setAttribute( 'src', 'about:blank' );
  3215. el.removeAttribute( 'src' );
  3216. } );
  3217. }
  3218. }
  3219. }
  3220. /**
  3221. * Returns the number of past slides. This can be used as a global
  3222. * flattened index for slides.
  3223. *
  3224. * @return {number} Past slide count
  3225. */
  3226. function getSlidePastCount() {
  3227. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3228. // The number of past slides
  3229. var pastCount = 0;
  3230. // Step through all slides and count the past ones
  3231. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  3232. var horizontalSlide = horizontalSlides[i];
  3233. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  3234. for( var j = 0; j < verticalSlides.length; j++ ) {
  3235. // Stop as soon as we arrive at the present
  3236. if( verticalSlides[j].classList.contains( 'present' ) ) {
  3237. break mainLoop;
  3238. }
  3239. pastCount++;
  3240. }
  3241. // Stop as soon as we arrive at the present
  3242. if( horizontalSlide.classList.contains( 'present' ) ) {
  3243. break;
  3244. }
  3245. // Don't count the wrapping section for vertical slides
  3246. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  3247. pastCount++;
  3248. }
  3249. }
  3250. return pastCount;
  3251. }
  3252. /**
  3253. * Returns a value ranging from 0-1 that represents
  3254. * how far into the presentation we have navigated.
  3255. *
  3256. * @return {number}
  3257. */
  3258. function getProgress() {
  3259. // The number of past and total slides
  3260. var totalCount = getTotalSlides();
  3261. var pastCount = getSlidePastCount();
  3262. if( currentSlide ) {
  3263. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  3264. // If there are fragments in the current slide those should be
  3265. // accounted for in the progress.
  3266. if( allFragments.length > 0 ) {
  3267. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  3268. // This value represents how big a portion of the slide progress
  3269. // that is made up by its fragments (0-1)
  3270. var fragmentWeight = 0.9;
  3271. // Add fragment progress to the past slide count
  3272. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  3273. }
  3274. }
  3275. return pastCount / ( totalCount - 1 );
  3276. }
  3277. /**
  3278. * Checks if this presentation is running inside of the
  3279. * speaker notes window.
  3280. *
  3281. * @return {boolean}
  3282. */
  3283. function isSpeakerNotes() {
  3284. return !!window.location.search.match( /receiver/gi );
  3285. }
  3286. /**
  3287. * Reads the current URL (hash) and navigates accordingly.
  3288. */
  3289. function readURL() {
  3290. var hash = window.location.hash;
  3291. // Attempt to parse the hash as either an index or name
  3292. var bits = hash.slice( 2 ).split( '/' ),
  3293. name = hash.replace( /#|\//gi, '' );
  3294. // If the first bit is not fully numeric and there is a name we
  3295. // can assume that this is a named link
  3296. if( !/^[0-9]*$/.test( bits[0] ) && name.length ) {
  3297. var element;
  3298. // Ensure the named link is a valid HTML ID attribute
  3299. try {
  3300. element = document.getElementById( decodeURIComponent( name ) );
  3301. }
  3302. catch ( error ) { }
  3303. // Ensure that we're not already on a slide with the same name
  3304. var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
  3305. if( element ) {
  3306. // If the slide exists and is not the current slide...
  3307. if ( !isSameNameAsCurrentSlide ) {
  3308. // ...find the position of the named slide and navigate to it
  3309. var indices = Reveal.getIndices(element);
  3310. slide(indices.h, indices.v);
  3311. }
  3312. }
  3313. // If the slide doesn't exist, navigate to the current slide
  3314. else {
  3315. slide( indexh || 0, indexv || 0 );
  3316. }
  3317. }
  3318. else {
  3319. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  3320. // Read the index components of the hash
  3321. var h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,
  3322. v = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,
  3323. f;
  3324. if( config.fragmentInURL ) {
  3325. f = parseInt( bits[2], 10 );
  3326. if( isNaN( f ) ) {
  3327. f = undefined;
  3328. }
  3329. }
  3330. if( h !== indexh || v !== indexv || f !== undefined ) {
  3331. slide( h, v, f );
  3332. }
  3333. }
  3334. }
  3335. /**
  3336. * Updates the page URL (hash) to reflect the current
  3337. * state.
  3338. *
  3339. * @param {number} delay The time in ms to wait before
  3340. * writing the hash
  3341. */
  3342. function writeURL( delay ) {
  3343. // Make sure there's never more than one timeout running
  3344. clearTimeout( writeURLTimeout );
  3345. // If a delay is specified, timeout this call
  3346. if( typeof delay === 'number' ) {
  3347. writeURLTimeout = setTimeout( writeURL, delay );
  3348. }
  3349. else if( currentSlide ) {
  3350. if( config.history || !window.history ) {
  3351. window.location.hash = locationHash();
  3352. }
  3353. else if( config.hash ) {
  3354. window.history.replaceState(null, null, '#' + locationHash());
  3355. }
  3356. }
  3357. }
  3358. /**
  3359. * Retrieves the h/v location and fragment of the current,
  3360. * or specified, slide.
  3361. *
  3362. * @param {HTMLElement} [slide] If specified, the returned
  3363. * index will be for this slide rather than the currently
  3364. * active one
  3365. *
  3366. * @return {{h: number, v: number, f: number}}
  3367. */
  3368. function getIndices( slide ) {
  3369. // By default, return the current indices
  3370. var h = indexh,
  3371. v = indexv,
  3372. f;
  3373. // If a slide is specified, return the indices of that slide
  3374. if( slide ) {
  3375. var isVertical = isVerticalSlide( slide );
  3376. var slideh = isVertical ? slide.parentNode : slide;
  3377. // Select all horizontal slides
  3378. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3379. // Now that we know which the horizontal slide is, get its index
  3380. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  3381. // Assume we're not vertical
  3382. v = undefined;
  3383. // If this is a vertical slide, grab the vertical index
  3384. if( isVertical ) {
  3385. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  3386. }
  3387. }
  3388. if( !slide && currentSlide ) {
  3389. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  3390. if( hasFragments ) {
  3391. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  3392. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  3393. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  3394. }
  3395. else {
  3396. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  3397. }
  3398. }
  3399. }
  3400. return { h: h, v: v, f: f };
  3401. }
  3402. /**
  3403. * Retrieves all slides in this presentation.
  3404. */
  3405. function getSlides() {
  3406. return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ));
  3407. }
  3408. /**
  3409. * Returns an array of objects where each object represents the
  3410. * attributes on its respective slide.
  3411. */
  3412. function getSlidesAttributes() {
  3413. return getSlides().map( function( slide ) {
  3414. var attributes = {};
  3415. for( var i = 0; i < slide.attributes.length; i++ ) {
  3416. var attribute = slide.attributes[ i ];
  3417. attributes[ attribute.name ] = attribute.value;
  3418. }
  3419. return attributes;
  3420. } );
  3421. }
  3422. /**
  3423. * Retrieves the total number of slides in this presentation.
  3424. *
  3425. * @return {number}
  3426. */
  3427. function getTotalSlides() {
  3428. return getSlides().length;
  3429. }
  3430. /**
  3431. * Returns the slide element matching the specified index.
  3432. *
  3433. * @return {HTMLElement}
  3434. */
  3435. function getSlide( x, y ) {
  3436. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  3437. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  3438. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  3439. return verticalSlides ? verticalSlides[ y ] : undefined;
  3440. }
  3441. return horizontalSlide;
  3442. }
  3443. /**
  3444. * Returns the background element for the given slide.
  3445. * All slides, even the ones with no background properties
  3446. * defined, have a background element so as long as the
  3447. * index is valid an element will be returned.
  3448. *
  3449. * @param {mixed} x Horizontal background index OR a slide
  3450. * HTML element
  3451. * @param {number} y Vertical background index
  3452. * @return {(HTMLElement[]|*)}
  3453. */
  3454. function getSlideBackground( x, y ) {
  3455. var slide = typeof x === 'number' ? getSlide( x, y ) : x;
  3456. if( slide ) {
  3457. return slide.slideBackgroundElement;
  3458. }
  3459. return undefined;
  3460. }
  3461. /**
  3462. * Retrieves the speaker notes from a slide. Notes can be
  3463. * defined in two ways:
  3464. * 1. As a data-notes attribute on the slide <section>
  3465. * 2. As an <aside class="notes"> inside of the slide
  3466. *
  3467. * @param {HTMLElement} [slide=currentSlide]
  3468. * @return {(string|null)}
  3469. */
  3470. function getSlideNotes( slide ) {
  3471. // Default to the current slide
  3472. slide = slide || currentSlide;
  3473. // Notes can be specified via the data-notes attribute...
  3474. if( slide.hasAttribute( 'data-notes' ) ) {
  3475. return slide.getAttribute( 'data-notes' );
  3476. }
  3477. // ... or using an <aside class="notes"> element
  3478. var notesElement = slide.querySelector( 'aside.notes' );
  3479. if( notesElement ) {
  3480. return notesElement.innerHTML;
  3481. }
  3482. return null;
  3483. }
  3484. /**
  3485. * Retrieves the current state of the presentation as
  3486. * an object. This state can then be restored at any
  3487. * time.
  3488. *
  3489. * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
  3490. */
  3491. function getState() {
  3492. var indices = getIndices();
  3493. return {
  3494. indexh: indices.h,
  3495. indexv: indices.v,
  3496. indexf: indices.f,
  3497. paused: isPaused(),
  3498. overview: isOverview()
  3499. };
  3500. }
  3501. /**
  3502. * Restores the presentation to the given state.
  3503. *
  3504. * @param {object} state As generated by getState()
  3505. * @see {@link getState} generates the parameter `state`
  3506. */
  3507. function setState( state ) {
  3508. if( typeof state === 'object' ) {
  3509. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  3510. var pausedFlag = deserialize( state.paused ),
  3511. overviewFlag = deserialize( state.overview );
  3512. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  3513. togglePause( pausedFlag );
  3514. }
  3515. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  3516. toggleOverview( overviewFlag );
  3517. }
  3518. }
  3519. }
  3520. /**
  3521. * Return a sorted fragments list, ordered by an increasing
  3522. * "data-fragment-index" attribute.
  3523. *
  3524. * Fragments will be revealed in the order that they are returned by
  3525. * this function, so you can use the index attributes to control the
  3526. * order of fragment appearance.
  3527. *
  3528. * To maintain a sensible default fragment order, fragments are presumed
  3529. * to be passed in document order. This function adds a "fragment-index"
  3530. * attribute to each node if such an attribute is not already present,
  3531. * and sets that attribute to an integer value which is the position of
  3532. * the fragment within the fragments list.
  3533. *
  3534. * @param {object[]|*} fragments
  3535. * @param {boolean} grouped If true the returned array will contain
  3536. * nested arrays for all fragments with the same index
  3537. * @return {object[]} sorted Sorted array of fragments
  3538. */
  3539. function sortFragments( fragments, grouped ) {
  3540. fragments = toArray( fragments );
  3541. var ordered = [],
  3542. unordered = [],
  3543. sorted = [];
  3544. // Group ordered and unordered elements
  3545. fragments.forEach( function( fragment, i ) {
  3546. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  3547. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  3548. if( !ordered[index] ) {
  3549. ordered[index] = [];
  3550. }
  3551. ordered[index].push( fragment );
  3552. }
  3553. else {
  3554. unordered.push( [ fragment ] );
  3555. }
  3556. } );
  3557. // Append fragments without explicit indices in their
  3558. // DOM order
  3559. ordered = ordered.concat( unordered );
  3560. // Manually count the index up per group to ensure there
  3561. // are no gaps
  3562. var index = 0;
  3563. // Push all fragments in their sorted order to an array,
  3564. // this flattens the groups
  3565. ordered.forEach( function( group ) {
  3566. group.forEach( function( fragment ) {
  3567. sorted.push( fragment );
  3568. fragment.setAttribute( 'data-fragment-index', index );
  3569. } );
  3570. index ++;
  3571. } );
  3572. return grouped === true ? ordered : sorted;
  3573. }
  3574. /**
  3575. * Refreshes the fragments on the current slide so that they
  3576. * have the appropriate classes (.visible + .current-fragment).
  3577. *
  3578. * @param {number} [index] The index of the current fragment
  3579. * @param {array} [fragments] Array containing all fragments
  3580. * in the current slide
  3581. *
  3582. * @return {{shown: array, hidden: array}}
  3583. */
  3584. function updateFragments( index, fragments ) {
  3585. var changedFragments = {
  3586. shown: [],
  3587. hidden: []
  3588. };
  3589. if( currentSlide && config.fragments ) {
  3590. fragments = fragments || sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3591. if( fragments.length ) {
  3592. if( typeof index !== 'number' ) {
  3593. var currentFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3594. if( currentFragment ) {
  3595. index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3596. }
  3597. }
  3598. toArray( fragments ).forEach( function( el, i ) {
  3599. if( el.hasAttribute( 'data-fragment-index' ) ) {
  3600. i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
  3601. }
  3602. // Visible fragments
  3603. if( i <= index ) {
  3604. if( !el.classList.contains( 'visible' ) ) changedFragments.shown.push( el );
  3605. el.classList.add( 'visible' );
  3606. el.classList.remove( 'current-fragment' );
  3607. // Announce the fragments one by one to the Screen Reader
  3608. dom.statusDiv.textContent = getStatusText( el );
  3609. if( i === index ) {
  3610. el.classList.add( 'current-fragment' );
  3611. startEmbeddedContent( el );
  3612. }
  3613. }
  3614. // Hidden fragments
  3615. else {
  3616. if( el.classList.contains( 'visible' ) ) changedFragments.hidden.push( el );
  3617. el.classList.remove( 'visible' );
  3618. el.classList.remove( 'current-fragment' );
  3619. }
  3620. } );
  3621. }
  3622. }
  3623. return changedFragments;
  3624. }
  3625. /**
  3626. * Navigate to the specified slide fragment.
  3627. *
  3628. * @param {?number} index The index of the fragment that
  3629. * should be shown, -1 means all are invisible
  3630. * @param {number} offset Integer offset to apply to the
  3631. * fragment index
  3632. *
  3633. * @return {boolean} true if a change was made in any
  3634. * fragments visibility as part of this call
  3635. */
  3636. function navigateFragment( index, offset ) {
  3637. if( currentSlide && config.fragments ) {
  3638. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3639. if( fragments.length ) {
  3640. // If no index is specified, find the current
  3641. if( typeof index !== 'number' ) {
  3642. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3643. if( lastVisibleFragment ) {
  3644. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3645. }
  3646. else {
  3647. index = -1;
  3648. }
  3649. }
  3650. // If an offset is specified, apply it to the index
  3651. if( typeof offset === 'number' ) {
  3652. index += offset;
  3653. }
  3654. var changedFragments = updateFragments( index, fragments );
  3655. if( changedFragments.hidden.length ) {
  3656. dispatchEvent( 'fragmenthidden', { fragment: changedFragments.hidden[0], fragments: changedFragments.hidden } );
  3657. }
  3658. if( changedFragments.shown.length ) {
  3659. dispatchEvent( 'fragmentshown', { fragment: changedFragments.shown[0], fragments: changedFragments.shown } );
  3660. }
  3661. updateControls();
  3662. updateProgress();
  3663. if( config.fragmentInURL ) {
  3664. writeURL();
  3665. }
  3666. return !!( changedFragments.shown.length || changedFragments.hidden.length );
  3667. }
  3668. }
  3669. return false;
  3670. }
  3671. /**
  3672. * Navigate to the next slide fragment.
  3673. *
  3674. * @return {boolean} true if there was a next fragment,
  3675. * false otherwise
  3676. */
  3677. function nextFragment() {
  3678. return navigateFragment( null, 1 );
  3679. }
  3680. /**
  3681. * Navigate to the previous slide fragment.
  3682. *
  3683. * @return {boolean} true if there was a previous fragment,
  3684. * false otherwise
  3685. */
  3686. function previousFragment() {
  3687. return navigateFragment( null, -1 );
  3688. }
  3689. /**
  3690. * Cues a new automated slide if enabled in the config.
  3691. */
  3692. function cueAutoSlide() {
  3693. cancelAutoSlide();
  3694. if( currentSlide && config.autoSlide !== false ) {
  3695. var fragment = currentSlide.querySelector( '.current-fragment' );
  3696. // When the slide first appears there is no "current" fragment so
  3697. // we look for a data-autoslide timing on the first fragment
  3698. if( !fragment ) fragment = currentSlide.querySelector( '.fragment' );
  3699. var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
  3700. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  3701. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  3702. // Pick value in the following priority order:
  3703. // 1. Current fragment's data-autoslide
  3704. // 2. Current slide's data-autoslide
  3705. // 3. Parent slide's data-autoslide
  3706. // 4. Global autoSlide setting
  3707. if( fragmentAutoSlide ) {
  3708. autoSlide = parseInt( fragmentAutoSlide, 10 );
  3709. }
  3710. else if( slideAutoSlide ) {
  3711. autoSlide = parseInt( slideAutoSlide, 10 );
  3712. }
  3713. else if( parentAutoSlide ) {
  3714. autoSlide = parseInt( parentAutoSlide, 10 );
  3715. }
  3716. else {
  3717. autoSlide = config.autoSlide;
  3718. }
  3719. // If there are media elements with data-autoplay,
  3720. // automatically set the autoSlide duration to the
  3721. // length of that media. Not applicable if the slide
  3722. // is divided up into fragments.
  3723. // playbackRate is accounted for in the duration.
  3724. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  3725. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3726. if( el.hasAttribute( 'data-autoplay' ) ) {
  3727. if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
  3728. autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
  3729. }
  3730. }
  3731. } );
  3732. }
  3733. // Cue the next auto-slide if:
  3734. // - There is an autoSlide value
  3735. // - Auto-sliding isn't paused by the user
  3736. // - The presentation isn't paused
  3737. // - The overview isn't active
  3738. // - The presentation isn't over
  3739. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  3740. autoSlideTimeout = setTimeout( function() {
  3741. typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
  3742. cueAutoSlide();
  3743. }, autoSlide );
  3744. autoSlideStartTime = Date.now();
  3745. }
  3746. if( autoSlidePlayer ) {
  3747. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  3748. }
  3749. }
  3750. }
  3751. /**
  3752. * Cancels any ongoing request to auto-slide.
  3753. */
  3754. function cancelAutoSlide() {
  3755. clearTimeout( autoSlideTimeout );
  3756. autoSlideTimeout = -1;
  3757. }
  3758. function pauseAutoSlide() {
  3759. if( autoSlide && !autoSlidePaused ) {
  3760. autoSlidePaused = true;
  3761. dispatchEvent( 'autoslidepaused' );
  3762. clearTimeout( autoSlideTimeout );
  3763. if( autoSlidePlayer ) {
  3764. autoSlidePlayer.setPlaying( false );
  3765. }
  3766. }
  3767. }
  3768. function resumeAutoSlide() {
  3769. if( autoSlide && autoSlidePaused ) {
  3770. autoSlidePaused = false;
  3771. dispatchEvent( 'autoslideresumed' );
  3772. cueAutoSlide();
  3773. }
  3774. }
  3775. function navigateLeft() {
  3776. // Reverse for RTL
  3777. if( config.rtl ) {
  3778. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  3779. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3780. }
  3781. }
  3782. // Normal navigation
  3783. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  3784. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3785. }
  3786. }
  3787. function navigateRight() {
  3788. hasNavigatedRight = true;
  3789. // Reverse for RTL
  3790. if( config.rtl ) {
  3791. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  3792. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3793. }
  3794. }
  3795. // Normal navigation
  3796. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  3797. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3798. }
  3799. }
  3800. function navigateUp() {
  3801. // Prioritize hiding fragments
  3802. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  3803. slide( indexh, indexv - 1 );
  3804. }
  3805. }
  3806. function navigateDown() {
  3807. hasNavigatedDown = true;
  3808. // Prioritize revealing fragments
  3809. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  3810. slide( indexh, indexv + 1 );
  3811. }
  3812. }
  3813. /**
  3814. * Navigates backwards, prioritized in the following order:
  3815. * 1) Previous fragment
  3816. * 2) Previous vertical slide
  3817. * 3) Previous horizontal slide
  3818. */
  3819. function navigatePrev() {
  3820. // Prioritize revealing fragments
  3821. if( previousFragment() === false ) {
  3822. if( availableRoutes().up ) {
  3823. navigateUp();
  3824. }
  3825. else {
  3826. // Fetch the previous horizontal slide, if there is one
  3827. var previousSlide;
  3828. if( config.rtl ) {
  3829. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  3830. }
  3831. else {
  3832. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  3833. }
  3834. if( previousSlide ) {
  3835. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  3836. var h = indexh - 1;
  3837. slide( h, v );
  3838. }
  3839. }
  3840. }
  3841. }
  3842. /**
  3843. * The reverse of #navigatePrev().
  3844. */
  3845. function navigateNext() {
  3846. hasNavigatedRight = true;
  3847. hasNavigatedDown = true;
  3848. // Prioritize revealing fragments
  3849. if( nextFragment() === false ) {
  3850. var routes = availableRoutes();
  3851. // When looping is enabled `routes.down` is always available
  3852. // so we need a separate check for when we've reached the
  3853. // end of a stack and should move horizontally
  3854. if( routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide( currentSlide ) ) {
  3855. routes.down = false;
  3856. }
  3857. if( routes.down ) {
  3858. navigateDown();
  3859. }
  3860. else if( config.rtl ) {
  3861. navigateLeft();
  3862. }
  3863. else {
  3864. navigateRight();
  3865. }
  3866. }
  3867. }
  3868. /**
  3869. * Checks if the target element prevents the triggering of
  3870. * swipe navigation.
  3871. */
  3872. function isSwipePrevented( target ) {
  3873. while( target && typeof target.hasAttribute === 'function' ) {
  3874. if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
  3875. target = target.parentNode;
  3876. }
  3877. return false;
  3878. }
  3879. // --------------------------------------------------------------------//
  3880. // ----------------------------- EVENTS -------------------------------//
  3881. // --------------------------------------------------------------------//
  3882. /**
  3883. * Called by all event handlers that are based on user
  3884. * input.
  3885. *
  3886. * @param {object} [event]
  3887. */
  3888. function onUserInput( event ) {
  3889. if( config.autoSlideStoppable ) {
  3890. pauseAutoSlide();
  3891. }
  3892. }
  3893. /**
  3894. * Called whenever there is mouse input at the document level
  3895. * to determine if the cursor is active or not.
  3896. *
  3897. * @param {object} event
  3898. */
  3899. function onDocumentCursorActive( event ) {
  3900. showCursor();
  3901. clearTimeout( cursorInactiveTimeout );
  3902. cursorInactiveTimeout = setTimeout( hideCursor, config.hideCursorTime );
  3903. }
  3904. /**
  3905. * Handler for the document level 'keypress' event.
  3906. *
  3907. * @param {object} event
  3908. */
  3909. function onDocumentKeyPress( event ) {
  3910. // Check if the pressed key is question mark
  3911. if( event.shiftKey && event.charCode === 63 ) {
  3912. toggleHelp();
  3913. }
  3914. }
  3915. /**
  3916. * Handler for the document level 'keydown' event.
  3917. *
  3918. * @param {object} event
  3919. */
  3920. function onDocumentKeyDown( event ) {
  3921. // If there's a condition specified and it returns false,
  3922. // ignore this event
  3923. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
  3924. return true;
  3925. }
  3926. // Shorthand
  3927. var keyCode = event.keyCode;
  3928. // Remember if auto-sliding was paused so we can toggle it
  3929. var autoSlideWasPaused = autoSlidePaused;
  3930. onUserInput( event );
  3931. // Is there a focused element that could be using the keyboard?
  3932. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  3933. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  3934. var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
  3935. // Whitelist specific modified + keycode combinations
  3936. var prevSlideShortcut = event.shiftKey && event.keyCode === 32;
  3937. var firstSlideShortcut = ( event.metaKey || event.ctrlKey ) && keyCode === 37;
  3938. var lastSlideShortcut = ( event.metaKey || event.ctrlKey ) && keyCode === 39;
  3939. // Prevent all other events when a modifier is pressed
  3940. var unusedModifier = !prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
  3941. ( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );
  3942. // Disregard the event if there's a focused element or a
  3943. // keyboard modifier key is present
  3944. if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;
  3945. // While paused only allow resume keyboard events; 'b', 'v', '.'
  3946. var resumeKeyCodes = [66,86,190,191];
  3947. var key;
  3948. // Custom key bindings for togglePause should be able to resume
  3949. if( typeof config.keyboard === 'object' ) {
  3950. for( key in config.keyboard ) {
  3951. if( config.keyboard[key] === 'togglePause' ) {
  3952. resumeKeyCodes.push( parseInt( key, 10 ) );
  3953. }
  3954. }
  3955. }
  3956. if( isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
  3957. return false;
  3958. }
  3959. var triggered = false;
  3960. // 1. User defined key bindings
  3961. if( typeof config.keyboard === 'object' ) {
  3962. for( key in config.keyboard ) {
  3963. // Check if this binding matches the pressed key
  3964. if( parseInt( key, 10 ) === keyCode ) {
  3965. var value = config.keyboard[ key ];
  3966. // Callback function
  3967. if( typeof value === 'function' ) {
  3968. value.apply( null, [ event ] );
  3969. }
  3970. // String shortcuts to reveal.js API
  3971. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  3972. Reveal[ value ].call();
  3973. }
  3974. triggered = true;
  3975. }
  3976. }
  3977. }
  3978. // 2. Registered custom key bindings
  3979. if( triggered === false ) {
  3980. for( key in registeredKeyBindings ) {
  3981. // Check if this binding matches the pressed key
  3982. if( parseInt( key, 10 ) === keyCode ) {
  3983. var action = registeredKeyBindings[ key ].callback;
  3984. // Callback function
  3985. if( typeof action === 'function' ) {
  3986. action.apply( null, [ event ] );
  3987. }
  3988. // String shortcuts to reveal.js API
  3989. else if( typeof action === 'string' && typeof Reveal[ action ] === 'function' ) {
  3990. Reveal[ action ].call();
  3991. }
  3992. triggered = true;
  3993. }
  3994. }
  3995. }
  3996. // 3. System defined key bindings
  3997. if( triggered === false ) {
  3998. // Assume true and try to prove false
  3999. triggered = true;
  4000. // P, PAGE UP
  4001. if( keyCode === 80 || keyCode === 33 ) {
  4002. navigatePrev();
  4003. }
  4004. // N, PAGE DOWN
  4005. else if( keyCode === 78 || keyCode === 34 ) {
  4006. navigateNext();
  4007. }
  4008. // H, LEFT
  4009. else if( keyCode === 72 || keyCode === 37 ) {
  4010. if( firstSlideShortcut ) {
  4011. slide( 0 );
  4012. }
  4013. else if( !isOverview() && config.navigationMode === 'linear' ) {
  4014. navigatePrev();
  4015. }
  4016. else {
  4017. navigateLeft();
  4018. }
  4019. }
  4020. // L, RIGHT
  4021. else if( keyCode === 76 || keyCode === 39 ) {
  4022. if( lastSlideShortcut ) {
  4023. slide( Number.MAX_VALUE );
  4024. }
  4025. else if( !isOverview() && config.navigationMode === 'linear' ) {
  4026. navigateNext();
  4027. }
  4028. else {
  4029. navigateRight();
  4030. }
  4031. }
  4032. // K, UP
  4033. else if( keyCode === 75 || keyCode === 38 ) {
  4034. if( !isOverview() && config.navigationMode === 'linear' ) {
  4035. navigatePrev();
  4036. }
  4037. else {
  4038. navigateUp();
  4039. }
  4040. }
  4041. // J, DOWN
  4042. else if( keyCode === 74 || keyCode === 40 ) {
  4043. if( !isOverview() && config.navigationMode === 'linear' ) {
  4044. navigateNext();
  4045. }
  4046. else {
  4047. navigateDown();
  4048. }
  4049. }
  4050. // HOME
  4051. else if( keyCode === 36 ) {
  4052. slide( 0 );
  4053. }
  4054. // END
  4055. else if( keyCode === 35 ) {
  4056. slide( Number.MAX_VALUE );
  4057. }
  4058. // SPACE
  4059. else if( keyCode === 32 ) {
  4060. if( isOverview() ) {
  4061. deactivateOverview();
  4062. }
  4063. if( event.shiftKey ) {
  4064. navigatePrev();
  4065. }
  4066. else {
  4067. navigateNext();
  4068. }
  4069. }
  4070. // TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS "BLACK SCREEN" BUTTON
  4071. else if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {
  4072. togglePause();
  4073. }
  4074. // F
  4075. else if( keyCode === 70 ) {
  4076. enterFullscreen();
  4077. }
  4078. // A
  4079. else if( keyCode === 65 ) {
  4080. if ( config.autoSlideStoppable ) {
  4081. toggleAutoSlide( autoSlideWasPaused );
  4082. }
  4083. }
  4084. else {
  4085. triggered = false;
  4086. }
  4087. }
  4088. // If the input resulted in a triggered action we should prevent
  4089. // the browsers default behavior
  4090. if( triggered ) {
  4091. event.preventDefault && event.preventDefault();
  4092. }
  4093. // ESC or O key
  4094. else if ( ( keyCode === 27 || keyCode === 79 ) && features.transforms3d ) {
  4095. if( dom.overlay ) {
  4096. closeOverlay();
  4097. }
  4098. else {
  4099. toggleOverview();
  4100. }
  4101. event.preventDefault && event.preventDefault();
  4102. }
  4103. // If auto-sliding is enabled we need to cue up
  4104. // another timeout
  4105. cueAutoSlide();
  4106. }
  4107. /**
  4108. * Handler for the 'touchstart' event, enables support for
  4109. * swipe and pinch gestures.
  4110. *
  4111. * @param {object} event
  4112. */
  4113. function onTouchStart( event ) {
  4114. if( isSwipePrevented( event.target ) ) return true;
  4115. touch.startX = event.touches[0].clientX;
  4116. touch.startY = event.touches[0].clientY;
  4117. touch.startCount = event.touches.length;
  4118. }
  4119. /**
  4120. * Handler for the 'touchmove' event.
  4121. *
  4122. * @param {object} event
  4123. */
  4124. function onTouchMove( event ) {
  4125. if( isSwipePrevented( event.target ) ) return true;
  4126. // Each touch should only trigger one action
  4127. if( !touch.captured ) {
  4128. onUserInput( event );
  4129. var currentX = event.touches[0].clientX;
  4130. var currentY = event.touches[0].clientY;
  4131. // There was only one touch point, look for a swipe
  4132. if( event.touches.length === 1 && touch.startCount !== 2 ) {
  4133. var deltaX = currentX - touch.startX,
  4134. deltaY = currentY - touch.startY;
  4135. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4136. touch.captured = true;
  4137. navigateLeft();
  4138. }
  4139. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4140. touch.captured = true;
  4141. navigateRight();
  4142. }
  4143. else if( deltaY > touch.threshold ) {
  4144. touch.captured = true;
  4145. navigateUp();
  4146. }
  4147. else if( deltaY < -touch.threshold ) {
  4148. touch.captured = true;
  4149. navigateDown();
  4150. }
  4151. // If we're embedded, only block touch events if they have
  4152. // triggered an action
  4153. if( config.embedded ) {
  4154. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  4155. event.preventDefault();
  4156. }
  4157. }
  4158. // Not embedded? Block them all to avoid needless tossing
  4159. // around of the viewport in iOS
  4160. else {
  4161. event.preventDefault();
  4162. }
  4163. }
  4164. }
  4165. // There's a bug with swiping on some Android devices unless
  4166. // the default action is always prevented
  4167. else if( UA.match( /android/gi ) ) {
  4168. event.preventDefault();
  4169. }
  4170. }
  4171. /**
  4172. * Handler for the 'touchend' event.
  4173. *
  4174. * @param {object} event
  4175. */
  4176. function onTouchEnd( event ) {
  4177. touch.captured = false;
  4178. }
  4179. /**
  4180. * Convert pointer down to touch start.
  4181. *
  4182. * @param {object} event
  4183. */
  4184. function onPointerDown( event ) {
  4185. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4186. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4187. onTouchStart( event );
  4188. }
  4189. }
  4190. /**
  4191. * Convert pointer move to touch move.
  4192. *
  4193. * @param {object} event
  4194. */
  4195. function onPointerMove( event ) {
  4196. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4197. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4198. onTouchMove( event );
  4199. }
  4200. }
  4201. /**
  4202. * Convert pointer up to touch end.
  4203. *
  4204. * @param {object} event
  4205. */
  4206. function onPointerUp( event ) {
  4207. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4208. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4209. onTouchEnd( event );
  4210. }
  4211. }
  4212. /**
  4213. * Handles mouse wheel scrolling, throttled to avoid skipping
  4214. * multiple slides.
  4215. *
  4216. * @param {object} event
  4217. */
  4218. function onDocumentMouseScroll( event ) {
  4219. if( Date.now() - lastMouseWheelStep > 600 ) {
  4220. lastMouseWheelStep = Date.now();
  4221. var delta = event.detail || -event.wheelDelta;
  4222. if( delta > 0 ) {
  4223. navigateNext();
  4224. }
  4225. else if( delta < 0 ) {
  4226. navigatePrev();
  4227. }
  4228. }
  4229. }
  4230. /**
  4231. * Clicking on the progress bar results in a navigation to the
  4232. * closest approximate horizontal slide using this equation:
  4233. *
  4234. * ( clickX / presentationWidth ) * numberOfSlides
  4235. *
  4236. * @param {object} event
  4237. */
  4238. function onProgressClicked( event ) {
  4239. onUserInput( event );
  4240. event.preventDefault();
  4241. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  4242. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  4243. if( config.rtl ) {
  4244. slideIndex = slidesTotal - slideIndex;
  4245. }
  4246. slide( slideIndex );
  4247. }
  4248. /**
  4249. * Event handler for navigation control buttons.
  4250. */
  4251. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigatePrev() : navigateLeft(); }
  4252. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigateNext() : navigateRight(); }
  4253. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  4254. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  4255. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  4256. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  4257. /**
  4258. * Handler for the window level 'hashchange' event.
  4259. *
  4260. * @param {object} [event]
  4261. */
  4262. function onWindowHashChange( event ) {
  4263. readURL();
  4264. }
  4265. /**
  4266. * Handler for the window level 'resize' event.
  4267. *
  4268. * @param {object} [event]
  4269. */
  4270. function onWindowResize( event ) {
  4271. layout();
  4272. }
  4273. /**
  4274. * Handle for the window level 'visibilitychange' event.
  4275. *
  4276. * @param {object} [event]
  4277. */
  4278. function onPageVisibilityChange( event ) {
  4279. var isHidden = document.webkitHidden ||
  4280. document.msHidden ||
  4281. document.hidden;
  4282. // If, after clicking a link or similar and we're coming back,
  4283. // focus the document.body to ensure we can use keyboard shortcuts
  4284. if( isHidden === false && document.activeElement !== document.body ) {
  4285. // Not all elements support .blur() - SVGs among them.
  4286. if( typeof document.activeElement.blur === 'function' ) {
  4287. document.activeElement.blur();
  4288. }
  4289. document.body.focus();
  4290. }
  4291. }
  4292. /**
  4293. * Invoked when a slide is and we're in the overview.
  4294. *
  4295. * @param {object} event
  4296. */
  4297. function onOverviewSlideClicked( event ) {
  4298. // TODO There's a bug here where the event listeners are not
  4299. // removed after deactivating the overview.
  4300. if( eventsAreBound && isOverview() ) {
  4301. event.preventDefault();
  4302. var element = event.target;
  4303. while( element && !element.nodeName.match( /section/gi ) ) {
  4304. element = element.parentNode;
  4305. }
  4306. if( element && !element.classList.contains( 'disabled' ) ) {
  4307. deactivateOverview();
  4308. if( element.nodeName.match( /section/gi ) ) {
  4309. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  4310. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  4311. slide( h, v );
  4312. }
  4313. }
  4314. }
  4315. }
  4316. /**
  4317. * Handles clicks on links that are set to preview in the
  4318. * iframe overlay.
  4319. *
  4320. * @param {object} event
  4321. */
  4322. function onPreviewLinkClicked( event ) {
  4323. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  4324. var url = event.currentTarget.getAttribute( 'href' );
  4325. if( url ) {
  4326. showPreview( url );
  4327. event.preventDefault();
  4328. }
  4329. }
  4330. }
  4331. /**
  4332. * Handles click on the auto-sliding controls element.
  4333. *
  4334. * @param {object} [event]
  4335. */
  4336. function onAutoSlidePlayerClick( event ) {
  4337. // Replay
  4338. if( Reveal.isLastSlide() && config.loop === false ) {
  4339. slide( 0, 0 );
  4340. resumeAutoSlide();
  4341. }
  4342. // Resume
  4343. else if( autoSlidePaused ) {
  4344. resumeAutoSlide();
  4345. }
  4346. // Pause
  4347. else {
  4348. pauseAutoSlide();
  4349. }
  4350. }
  4351. // --------------------------------------------------------------------//
  4352. // ------------------------ PLAYBACK COMPONENT ------------------------//
  4353. // --------------------------------------------------------------------//
  4354. /**
  4355. * Constructor for the playback component, which displays
  4356. * play/pause/progress controls.
  4357. *
  4358. * @param {HTMLElement} container The component will append
  4359. * itself to this
  4360. * @param {function} progressCheck A method which will be
  4361. * called frequently to get the current progress on a range
  4362. * of 0-1
  4363. */
  4364. function Playback( container, progressCheck ) {
  4365. // Cosmetics
  4366. this.diameter = 100;
  4367. this.diameter2 = this.diameter/2;
  4368. this.thickness = 6;
  4369. // Flags if we are currently playing
  4370. this.playing = false;
  4371. // Current progress on a 0-1 range
  4372. this.progress = 0;
  4373. // Used to loop the animation smoothly
  4374. this.progressOffset = 1;
  4375. this.container = container;
  4376. this.progressCheck = progressCheck;
  4377. this.canvas = document.createElement( 'canvas' );
  4378. this.canvas.className = 'playback';
  4379. this.canvas.width = this.diameter;
  4380. this.canvas.height = this.diameter;
  4381. this.canvas.style.width = this.diameter2 + 'px';
  4382. this.canvas.style.height = this.diameter2 + 'px';
  4383. this.context = this.canvas.getContext( '2d' );
  4384. this.container.appendChild( this.canvas );
  4385. this.render();
  4386. }
  4387. /**
  4388. * @param value
  4389. */
  4390. Playback.prototype.setPlaying = function( value ) {
  4391. var wasPlaying = this.playing;
  4392. this.playing = value;
  4393. // Start repainting if we weren't already
  4394. if( !wasPlaying && this.playing ) {
  4395. this.animate();
  4396. }
  4397. else {
  4398. this.render();
  4399. }
  4400. };
  4401. Playback.prototype.animate = function() {
  4402. var progressBefore = this.progress;
  4403. this.progress = this.progressCheck();
  4404. // When we loop, offset the progress so that it eases
  4405. // smoothly rather than immediately resetting
  4406. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  4407. this.progressOffset = this.progress;
  4408. }
  4409. this.render();
  4410. if( this.playing ) {
  4411. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  4412. }
  4413. };
  4414. /**
  4415. * Renders the current progress and playback state.
  4416. */
  4417. Playback.prototype.render = function() {
  4418. var progress = this.playing ? this.progress : 0,
  4419. radius = ( this.diameter2 ) - this.thickness,
  4420. x = this.diameter2,
  4421. y = this.diameter2,
  4422. iconSize = 28;
  4423. // Ease towards 1
  4424. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  4425. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  4426. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  4427. this.context.save();
  4428. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  4429. // Solid background color
  4430. this.context.beginPath();
  4431. this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
  4432. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  4433. this.context.fill();
  4434. // Draw progress track
  4435. this.context.beginPath();
  4436. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  4437. this.context.lineWidth = this.thickness;
  4438. this.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';
  4439. this.context.stroke();
  4440. if( this.playing ) {
  4441. // Draw progress on top of track
  4442. this.context.beginPath();
  4443. this.context.arc( x, y, radius, startAngle, endAngle, false );
  4444. this.context.lineWidth = this.thickness;
  4445. this.context.strokeStyle = '#fff';
  4446. this.context.stroke();
  4447. }
  4448. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  4449. // Draw play/pause icons
  4450. if( this.playing ) {
  4451. this.context.fillStyle = '#fff';
  4452. this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
  4453. this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
  4454. }
  4455. else {
  4456. this.context.beginPath();
  4457. this.context.translate( 4, 0 );
  4458. this.context.moveTo( 0, 0 );
  4459. this.context.lineTo( iconSize - 4, iconSize / 2 );
  4460. this.context.lineTo( 0, iconSize );
  4461. this.context.fillStyle = '#fff';
  4462. this.context.fill();
  4463. }
  4464. this.context.restore();
  4465. };
  4466. Playback.prototype.on = function( type, listener ) {
  4467. this.canvas.addEventListener( type, listener, false );
  4468. };
  4469. Playback.prototype.off = function( type, listener ) {
  4470. this.canvas.removeEventListener( type, listener, false );
  4471. };
  4472. Playback.prototype.destroy = function() {
  4473. this.playing = false;
  4474. if( this.canvas.parentNode ) {
  4475. this.container.removeChild( this.canvas );
  4476. }
  4477. };
  4478. // --------------------------------------------------------------------//
  4479. // ------------------------------- API --------------------------------//
  4480. // --------------------------------------------------------------------//
  4481. Reveal = {
  4482. VERSION: VERSION,
  4483. initialize: initialize,
  4484. configure: configure,
  4485. sync: sync,
  4486. syncSlide: syncSlide,
  4487. syncFragments: syncFragments,
  4488. // Navigation methods
  4489. slide: slide,
  4490. left: navigateLeft,
  4491. right: navigateRight,
  4492. up: navigateUp,
  4493. down: navigateDown,
  4494. prev: navigatePrev,
  4495. next: navigateNext,
  4496. // Fragment methods
  4497. navigateFragment: navigateFragment,
  4498. prevFragment: previousFragment,
  4499. nextFragment: nextFragment,
  4500. // Deprecated aliases
  4501. navigateTo: slide,
  4502. navigateLeft: navigateLeft,
  4503. navigateRight: navigateRight,
  4504. navigateUp: navigateUp,
  4505. navigateDown: navigateDown,
  4506. navigatePrev: navigatePrev,
  4507. navigateNext: navigateNext,
  4508. // Forces an update in slide layout
  4509. layout: layout,
  4510. // Randomizes the order of slides
  4511. shuffle: shuffle,
  4512. // Returns an object with the available routes as booleans (left/right/top/bottom)
  4513. availableRoutes: availableRoutes,
  4514. // Returns an object with the available fragments as booleans (prev/next)
  4515. availableFragments: availableFragments,
  4516. // Toggles a help overlay with keyboard shortcuts
  4517. toggleHelp: toggleHelp,
  4518. // Toggles the overview mode on/off
  4519. toggleOverview: toggleOverview,
  4520. // Toggles the "black screen" mode on/off
  4521. togglePause: togglePause,
  4522. // Toggles the auto slide mode on/off
  4523. toggleAutoSlide: toggleAutoSlide,
  4524. // State checks
  4525. isOverview: isOverview,
  4526. isPaused: isPaused,
  4527. isAutoSliding: isAutoSliding,
  4528. isSpeakerNotes: isSpeakerNotes,
  4529. // Slide preloading
  4530. loadSlide: loadSlide,
  4531. unloadSlide: unloadSlide,
  4532. // Adds or removes all internal event listeners (such as keyboard)
  4533. addEventListeners: addEventListeners,
  4534. removeEventListeners: removeEventListeners,
  4535. // Facility for persisting and restoring the presentation state
  4536. getState: getState,
  4537. setState: setState,
  4538. // Presentation progress
  4539. getSlidePastCount: getSlidePastCount,
  4540. // Presentation progress on range of 0-1
  4541. getProgress: getProgress,
  4542. // Returns the indices of the current, or specified, slide
  4543. getIndices: getIndices,
  4544. // Returns an Array of all slides
  4545. getSlides: getSlides,
  4546. // Returns an Array of objects representing the attributes on
  4547. // the slides
  4548. getSlidesAttributes: getSlidesAttributes,
  4549. // Returns the total number of slides
  4550. getTotalSlides: getTotalSlides,
  4551. // Returns the slide element at the specified index
  4552. getSlide: getSlide,
  4553. // Returns the slide background element at the specified index
  4554. getSlideBackground: getSlideBackground,
  4555. // Returns the speaker notes string for a slide, or null
  4556. getSlideNotes: getSlideNotes,
  4557. // Returns the previous slide element, may be null
  4558. getPreviousSlide: function() {
  4559. return previousSlide;
  4560. },
  4561. // Returns the current slide element
  4562. getCurrentSlide: function() {
  4563. return currentSlide;
  4564. },
  4565. // Returns the current scale of the presentation content
  4566. getScale: function() {
  4567. return scale;
  4568. },
  4569. // Returns the current configuration object
  4570. getConfig: function() {
  4571. return config;
  4572. },
  4573. // Helper method, retrieves query string as a key/value hash
  4574. getQueryHash: function() {
  4575. var query = {};
  4576. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  4577. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  4578. } );
  4579. // Basic deserialization
  4580. for( var i in query ) {
  4581. var value = query[ i ];
  4582. query[ i ] = deserialize( unescape( value ) );
  4583. }
  4584. return query;
  4585. },
  4586. // Returns the top-level DOM element
  4587. getRevealElement: function() {
  4588. return dom.wrapper || document.querySelector( '.reveal' );
  4589. },
  4590. // Returns a hash with all registered plugins
  4591. getPlugins: function() {
  4592. return plugins;
  4593. },
  4594. // Returns true if we're currently on the first slide
  4595. isFirstSlide: function() {
  4596. return ( indexh === 0 && indexv === 0 );
  4597. },
  4598. // Returns true if we're currently on the last slide
  4599. isLastSlide: function() {
  4600. if( currentSlide ) {
  4601. // Does this slide have a next sibling?
  4602. if( currentSlide.nextElementSibling ) return false;
  4603. // If it's vertical, does its parent have a next sibling?
  4604. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  4605. return true;
  4606. }
  4607. return false;
  4608. },
  4609. // Returns true if we're on the last slide in the current
  4610. // vertical stack
  4611. isLastVerticalSlide: function() {
  4612. if( currentSlide && isVerticalSlide( currentSlide ) ) {
  4613. // Does this slide have a next sibling?
  4614. if( currentSlide.nextElementSibling ) return false;
  4615. return true;
  4616. }
  4617. return false;
  4618. },
  4619. // Checks if reveal.js has been loaded and is ready for use
  4620. isReady: function() {
  4621. return loaded;
  4622. },
  4623. // Forward event binding to the reveal DOM element
  4624. addEventListener: function( type, listener, useCapture ) {
  4625. if( 'addEventListener' in window ) {
  4626. Reveal.getRevealElement().addEventListener( type, listener, useCapture );
  4627. }
  4628. },
  4629. removeEventListener: function( type, listener, useCapture ) {
  4630. if( 'addEventListener' in window ) {
  4631. Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
  4632. }
  4633. },
  4634. // Adds/remvoes a custom key binding
  4635. addKeyBinding: addKeyBinding,
  4636. removeKeyBinding: removeKeyBinding,
  4637. // Called by plugins to register themselves
  4638. registerPlugin: registerPlugin,
  4639. // Programatically triggers a keyboard event
  4640. triggerKey: function( keyCode ) {
  4641. onDocumentKeyDown( { keyCode: keyCode } );
  4642. },
  4643. // Registers a new shortcut to include in the help overlay
  4644. registerKeyboardShortcut: function( key, value ) {
  4645. keyboardShortcuts[key] = value;
  4646. }
  4647. };
  4648. return Reveal;
  4649. }));