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