reveal.js 168 KB

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  1. /*!
  2. * reveal.js
  3. * http://revealjs.com
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2019 Hakim El Hattab, http://hakim.se
  7. */
  8. (function( root, factory ) {
  9. if( typeof define === 'function' && define.amd ) {
  10. // AMD. Register as an anonymous module.
  11. define( function() {
  12. root.Reveal = factory();
  13. return root.Reveal;
  14. } );
  15. } else if( typeof exports === 'object' ) {
  16. // Node. Does not work with strict CommonJS.
  17. module.exports = factory();
  18. } else {
  19. // Browser globals.
  20. root.Reveal = factory();
  21. }
  22. }( this, function() {
  23. 'use strict';
  24. var Reveal;
  25. // The reveal.js version
  26. var VERSION = '3.8.0';
  27. var SLIDES_SELECTOR = '.slides section',
  28. HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
  29. VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
  30. HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
  31. UA = navigator.userAgent,
  32. // Configuration defaults, can be overridden at initialization time
  33. config = {
  34. // The "normal" size of the presentation, aspect ratio will be preserved
  35. // when the presentation is scaled to fit different resolutions
  36. width: 960,
  37. height: 700,
  38. // Factor of the display size that should remain empty around the content
  39. margin: 0.04,
  40. // Bounds for smallest/largest possible scale to apply to content
  41. minScale: 0.2,
  42. maxScale: 2.0,
  43. // Display presentation control arrows
  44. controls: true,
  45. // Help the user learn the controls by providing hints, for example by
  46. // bouncing the down arrow when they first encounter a vertical slide
  47. controlsTutorial: true,
  48. // Determines where controls appear, "edges" or "bottom-right"
  49. controlsLayout: 'bottom-right',
  50. // Visibility rule for backwards navigation arrows; "faded", "hidden"
  51. // or "visible"
  52. controlsBackArrows: 'faded',
  53. // Display a presentation progress bar
  54. progress: true,
  55. // Display the page number of the current slide
  56. // - true: Show slide number
  57. // - false: Hide slide number
  58. //
  59. // Can optionally be set as a string that specifies the number formatting:
  60. // - "h.v": Horizontal . vertical slide number (default)
  61. // - "h/v": Horizontal / vertical slide number
  62. // - "c": Flattened slide number
  63. // - "c/t": Flattened slide number / total slides
  64. //
  65. // Alternatively, you can provide a function that returns the slide
  66. // number for the current slide. The function needs to return an array
  67. // with one string [slideNumber] or three strings [n1,delimiter,n2].
  68. // See #formatSlideNumber().
  69. slideNumber: false,
  70. // Can be used to limit the contexts in which the slide number appears
  71. // - "all": Always show the slide number
  72. // - "print": Only when printing to PDF
  73. // - "speaker": Only in the speaker view
  74. showSlideNumber: 'all',
  75. // Use 1 based indexing for # links to match slide number (default is zero
  76. // based)
  77. hashOneBasedIndex: false,
  78. // Add the current slide number to the URL hash so that reloading the
  79. // page/copying the URL will return you to the same slide
  80. hash: false,
  81. // Push each slide change to the browser history. Implies `hash: true`
  82. history: false,
  83. // Enable keyboard shortcuts for navigation
  84. keyboard: true,
  85. // Optional function that blocks keyboard events when retuning false
  86. keyboardCondition: null,
  87. // Enable the slide overview mode
  88. overview: true,
  89. // Disables the default reveal.js slide layout so that you can use
  90. // custom CSS layout
  91. disableLayout: false,
  92. // Vertical centering of slides
  93. center: true,
  94. // Enables touch navigation on devices with touch input
  95. touch: true,
  96. // Loop the presentation
  97. loop: false,
  98. // Change the presentation direction to be RTL
  99. rtl: false,
  100. // Changes the behavior of our navigation directions.
  101. //
  102. // "default"
  103. // Left/right arrow keys step between horizontal slides, up/down
  104. // arrow keys step between vertical slides. Space key steps through
  105. // all slides (both horizontal and vertical).
  106. //
  107. // "linear"
  108. // Removes the up/down arrows. Left/right arrows step through all
  109. // slides (both horizontal and vertical).
  110. //
  111. // "grid"
  112. // When this is enabled, stepping left/right from a vertical stack
  113. // to an adjacent vertical stack will land you at the same vertical
  114. // index.
  115. //
  116. // Consider a deck with six slides ordered in two vertical stacks:
  117. // 1.1 2.1
  118. // 1.2 2.2
  119. // 1.3 2.3
  120. //
  121. // If you're on slide 1.3 and navigate right, you will normally move
  122. // from 1.3 -> 2.1. If "grid" is used, the same navigation takes you
  123. // from 1.3 -> 2.3.
  124. navigationMode: 'default',
  125. // Randomizes the order of slides each time the presentation loads
  126. shuffle: false,
  127. // Turns fragments on and off globally
  128. fragments: true,
  129. // Flags whether to include the current fragment in the URL,
  130. // so that reloading brings you to the same fragment position
  131. fragmentInURL: false,
  132. // Flags if the presentation is running in an embedded mode,
  133. // i.e. contained within a limited portion of the screen
  134. embedded: false,
  135. // Flags if we should show a help overlay when the question-mark
  136. // key is pressed
  137. help: true,
  138. // Flags if it should be possible to pause the presentation (blackout)
  139. pause: true,
  140. // Flags if speaker notes should be visible to all viewers
  141. showNotes: false,
  142. // Global override for autolaying embedded media (video/audio/iframe)
  143. // - null: Media will only autoplay if data-autoplay is present
  144. // - true: All media will autoplay, regardless of individual setting
  145. // - false: No media will autoplay, regardless of individual setting
  146. autoPlayMedia: null,
  147. // Global override for preloading lazy-loaded iframes
  148. // - null: Iframes with data-src AND data-preload will be loaded when within
  149. // the viewDistance, iframes with only data-src will be loaded when visible
  150. // - true: All iframes with data-src will be loaded when within the viewDistance
  151. // - false: All iframes with data-src will be loaded only when visible
  152. preloadIframes: null,
  153. // Controls automatic progression to the next slide
  154. // - 0: Auto-sliding only happens if the data-autoslide HTML attribute
  155. // is present on the current slide or fragment
  156. // - 1+: All slides will progress automatically at the given interval
  157. // - false: No auto-sliding, even if data-autoslide is present
  158. autoSlide: 0,
  159. // Stop auto-sliding after user input
  160. autoSlideStoppable: true,
  161. // Use this method for navigation when auto-sliding (defaults to navigateNext)
  162. autoSlideMethod: null,
  163. // Specify the average time in seconds that you think you will spend
  164. // presenting each slide. This is used to show a pacing timer in the
  165. // speaker view
  166. defaultTiming: null,
  167. // Enable slide navigation via mouse wheel
  168. mouseWheel: false,
  169. // Apply a 3D roll to links on hover
  170. rollingLinks: false,
  171. // Hides the address bar on mobile devices
  172. hideAddressBar: true,
  173. // Opens links in an iframe preview overlay
  174. // Add `data-preview-link` and `data-preview-link="false"` to customise each link
  175. // individually
  176. previewLinks: false,
  177. // Exposes the reveal.js API through window.postMessage
  178. postMessage: true,
  179. // Dispatches all reveal.js events to the parent window through postMessage
  180. postMessageEvents: false,
  181. // Focuses body when page changes visibility to ensure keyboard shortcuts work
  182. focusBodyOnPageVisibilityChange: true,
  183. // Transition style
  184. transition: 'slide', // none/fade/slide/convex/concave/zoom
  185. // Transition speed
  186. transitionSpeed: 'default', // default/fast/slow
  187. // Transition style for full page slide backgrounds
  188. backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
  189. // Parallax background image
  190. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  191. // Parallax background size
  192. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  193. // Parallax background repeat
  194. parallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit
  195. // Parallax background position
  196. parallaxBackgroundPosition: '', // CSS syntax, e.g. "top left"
  197. // Amount of pixels to move the parallax background per slide step
  198. parallaxBackgroundHorizontal: null,
  199. parallaxBackgroundVertical: null,
  200. // The maximum number of pages a single slide can expand onto when printing
  201. // to PDF, unlimited by default
  202. pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,
  203. // Prints each fragment on a separate slide
  204. pdfSeparateFragments: true,
  205. // Offset used to reduce the height of content within exported PDF pages.
  206. // This exists to account for environment differences based on how you
  207. // print to PDF. CLI printing options, like phantomjs and wkpdf, can end
  208. // on precisely the total height of the document whereas in-browser
  209. // printing has to end one pixel before.
  210. pdfPageHeightOffset: -1,
  211. // Number of slides away from the current that are visible
  212. viewDistance: 3,
  213. // The display mode that will be used to show slides
  214. display: 'block',
  215. // Hide cursor if inactive
  216. hideInactiveCursor: true,
  217. // Time before the cursor is hidden (in ms)
  218. hideCursorTime: 5000,
  219. // Script dependencies to load
  220. dependencies: []
  221. },
  222. // Flags if Reveal.initialize() has been called
  223. initialized = false,
  224. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  225. loaded = false,
  226. // Flags if the overview mode is currently active
  227. overview = false,
  228. // Holds the dimensions of our overview slides, including margins
  229. overviewSlideWidth = null,
  230. overviewSlideHeight = null,
  231. // The horizontal and vertical index of the currently active slide
  232. indexh,
  233. indexv,
  234. // The previous and current slide HTML elements
  235. previousSlide,
  236. currentSlide,
  237. previousBackground,
  238. // Remember which directions that the user has navigated towards
  239. hasNavigatedRight = false,
  240. hasNavigatedDown = false,
  241. // Slides may hold a data-state attribute which we pick up and apply
  242. // as a class to the body. This list contains the combined state of
  243. // all current slides.
  244. state = [],
  245. // The current scale of the presentation (see width/height config)
  246. scale = 1,
  247. // CSS transform that is currently applied to the slides container,
  248. // split into two groups
  249. slidesTransform = { layout: '', overview: '' },
  250. // Cached references to DOM elements
  251. dom = {},
  252. // A list of registered reveal.js plugins
  253. plugins = {},
  254. // List of asynchronously loaded reveal.js dependencies
  255. asyncDependencies = [],
  256. // Features supported by the browser, see #checkCapabilities()
  257. features = {},
  258. // Client is a mobile device, see #checkCapabilities()
  259. isMobileDevice,
  260. // Client is a desktop Chrome, see #checkCapabilities()
  261. isChrome,
  262. // Throttles mouse wheel navigation
  263. lastMouseWheelStep = 0,
  264. // Delays updates to the URL due to a Chrome thumbnailer bug
  265. writeURLTimeout = 0,
  266. // Is the mouse pointer currently hidden from view
  267. cursorHidden = false,
  268. // Timeout used to determine when the cursor is inactive
  269. cursorInactiveTimeout = 0,
  270. // Flags if the interaction event listeners are bound
  271. eventsAreBound = false,
  272. // The current auto-slide duration
  273. autoSlide = 0,
  274. // Auto slide properties
  275. autoSlidePlayer,
  276. autoSlideTimeout = 0,
  277. autoSlideStartTime = -1,
  278. autoSlidePaused = false,
  279. // Holds information about the currently ongoing touch input
  280. touch = {
  281. startX: 0,
  282. startY: 0,
  283. startCount: 0,
  284. captured: false,
  285. threshold: 40
  286. },
  287. // A key:value map of shortcut keyboard keys and descriptions of
  288. // the actions they trigger, generated in #configure()
  289. keyboardShortcuts = {},
  290. // Holds custom key code mappings
  291. registeredKeyBindings = {};
  292. /**
  293. * Starts up the presentation if the client is capable.
  294. */
  295. function initialize( options ) {
  296. // Make sure we only initialize once
  297. if( initialized === true ) return;
  298. initialized = true;
  299. checkCapabilities();
  300. if( !features.transforms2d && !features.transforms3d ) {
  301. document.body.setAttribute( 'class', 'no-transforms' );
  302. // Since JS won't be running any further, we load all lazy
  303. // loading elements upfront
  304. var images = toArray( document.getElementsByTagName( 'img' ) ),
  305. iframes = toArray( document.getElementsByTagName( 'iframe' ) );
  306. var lazyLoadable = images.concat( iframes );
  307. for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
  308. var element = lazyLoadable[i];
  309. if( element.getAttribute( 'data-src' ) ) {
  310. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  311. element.removeAttribute( 'data-src' );
  312. }
  313. }
  314. // If the browser doesn't support core features we won't be
  315. // using JavaScript to control the presentation
  316. return;
  317. }
  318. // Cache references to key DOM elements
  319. dom.wrapper = document.querySelector( '.reveal' );
  320. dom.slides = document.querySelector( '.reveal .slides' );
  321. // Force a layout when the whole page, incl fonts, has loaded
  322. window.addEventListener( 'load', layout, false );
  323. var query = Reveal.getQueryHash();
  324. // Do not accept new dependencies via query config to avoid
  325. // the potential of malicious script injection
  326. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  327. // Copy options over to our config object
  328. extend( config, options );
  329. extend( config, query );
  330. // Hide the address bar in mobile browsers
  331. hideAddressBar();
  332. // Loads dependencies and continues to #start() once done
  333. load();
  334. }
  335. /**
  336. * Inspect the client to see what it's capable of, this
  337. * should only happens once per runtime.
  338. */
  339. function checkCapabilities() {
  340. isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA ) ||
  341. ( navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1 ); // iPadOS
  342. isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
  343. var testElement = document.createElement( 'div' );
  344. features.transforms3d = 'WebkitPerspective' in testElement.style ||
  345. 'MozPerspective' in testElement.style ||
  346. 'msPerspective' in testElement.style ||
  347. 'OPerspective' in testElement.style ||
  348. 'perspective' in testElement.style;
  349. features.transforms2d = 'WebkitTransform' in testElement.style ||
  350. 'MozTransform' in testElement.style ||
  351. 'msTransform' in testElement.style ||
  352. 'OTransform' in testElement.style ||
  353. 'transform' in testElement.style;
  354. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  355. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  356. features.canvas = !!document.createElement( 'canvas' ).getContext;
  357. // Transitions in the overview are disabled in desktop and
  358. // Safari due to lag
  359. features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );
  360. // Flags if we should use zoom instead of transform to scale
  361. // up slides. Zoom produces crisper results but has a lot of
  362. // xbrowser quirks so we only use it in whitelsited browsers.
  363. features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
  364. ( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
  365. }
  366. /**
  367. * Loads the dependencies of reveal.js. Dependencies are
  368. * defined via the configuration option 'dependencies'
  369. * and will be loaded prior to starting/binding reveal.js.
  370. * Some dependencies may have an 'async' flag, if so they
  371. * will load after reveal.js has been started up.
  372. */
  373. function load() {
  374. var scripts = [],
  375. scriptsToLoad = 0;
  376. config.dependencies.forEach( function( s ) {
  377. // Load if there's no condition or the condition is truthy
  378. if( !s.condition || s.condition() ) {
  379. if( s.async ) {
  380. asyncDependencies.push( s );
  381. }
  382. else {
  383. scripts.push( s );
  384. }
  385. }
  386. } );
  387. if( scripts.length ) {
  388. scriptsToLoad = scripts.length;
  389. // Load synchronous scripts
  390. scripts.forEach( function( s ) {
  391. loadScript( s.src, function() {
  392. if( typeof s.callback === 'function' ) s.callback();
  393. if( --scriptsToLoad === 0 ) {
  394. initPlugins();
  395. }
  396. } );
  397. } );
  398. }
  399. else {
  400. initPlugins();
  401. }
  402. }
  403. /**
  404. * Initializes our plugins and waits for them to be ready
  405. * before proceeding.
  406. */
  407. function initPlugins() {
  408. var pluginsToInitialize = Object.keys( plugins ).length;
  409. // If there are no plugins, skip this step
  410. if( pluginsToInitialize === 0 ) {
  411. loadAsyncDependencies();
  412. }
  413. // ... otherwise initialize plugins
  414. else {
  415. var afterPlugInitialized = function() {
  416. if( --pluginsToInitialize === 0 ) {
  417. loadAsyncDependencies();
  418. }
  419. };
  420. for( var i in plugins ) {
  421. var plugin = plugins[i];
  422. // If the plugin has an 'init' method, invoke it
  423. if( typeof plugin.init === 'function' ) {
  424. var callback = plugin.init();
  425. // If the plugin returned a Promise, wait for it
  426. if( callback && typeof callback.then === 'function' ) {
  427. callback.then( afterPlugInitialized );
  428. }
  429. else {
  430. afterPlugInitialized();
  431. }
  432. }
  433. else {
  434. afterPlugInitialized();
  435. }
  436. }
  437. }
  438. }
  439. /**
  440. * Loads all async reveal.js dependencies.
  441. */
  442. function loadAsyncDependencies() {
  443. if( asyncDependencies.length ) {
  444. asyncDependencies.forEach( function( s ) {
  445. loadScript( s.src, s.callback );
  446. } );
  447. }
  448. start();
  449. }
  450. /**
  451. * Loads a JavaScript file from the given URL and executes it.
  452. *
  453. * @param {string} url Address of the .js file to load
  454. * @param {function} callback Method to invoke when the script
  455. * has loaded and executed
  456. */
  457. function loadScript( url, callback ) {
  458. var script = document.createElement( 'script' );
  459. script.type = 'text/javascript';
  460. script.async = false;
  461. script.defer = false;
  462. script.src = url;
  463. if( callback ) {
  464. // Success callback
  465. script.onload = script.onreadystatechange = function( event ) {
  466. if( event.type === "load" || (/loaded|complete/.test( script.readyState ) ) ) {
  467. // Kill event listeners
  468. script.onload = script.onreadystatechange = script.onerror = null;
  469. callback();
  470. }
  471. };
  472. // Error callback
  473. script.onerror = function( err ) {
  474. // Kill event listeners
  475. script.onload = script.onreadystatechange = script.onerror = null;
  476. callback( new Error( 'Failed loading script: ' + script.src + '\n' + err) );
  477. };
  478. }
  479. // Append the script at the end of <head>
  480. var head = document.querySelector( 'head' );
  481. head.insertBefore( script, head.lastChild );
  482. }
  483. /**
  484. * Starts up reveal.js by binding input events and navigating
  485. * to the current URL deeplink if there is one.
  486. */
  487. function start() {
  488. loaded = true;
  489. // Make sure we've got all the DOM elements we need
  490. setupDOM();
  491. // Listen to messages posted to this window
  492. setupPostMessage();
  493. // Prevent the slides from being scrolled out of view
  494. setupScrollPrevention();
  495. // Resets all vertical slides so that only the first is visible
  496. resetVerticalSlides();
  497. // Updates the presentation to match the current configuration values
  498. configure();
  499. // Read the initial hash
  500. readURL();
  501. // Update all backgrounds
  502. updateBackground( true );
  503. // Notify listeners that the presentation is ready but use a 1ms
  504. // timeout to ensure it's not fired synchronously after #initialize()
  505. setTimeout( function() {
  506. // Enable transitions now that we're loaded
  507. dom.slides.classList.remove( 'no-transition' );
  508. dom.wrapper.classList.add( 'ready' );
  509. dispatchEvent( 'ready', {
  510. 'indexh': indexh,
  511. 'indexv': indexv,
  512. 'currentSlide': currentSlide
  513. } );
  514. }, 1 );
  515. // Special setup and config is required when printing to PDF
  516. if( isPrintingPDF() ) {
  517. removeEventListeners();
  518. // The document needs to have loaded for the PDF layout
  519. // measurements to be accurate
  520. if( document.readyState === 'complete' ) {
  521. setupPDF();
  522. }
  523. else {
  524. window.addEventListener( 'load', setupPDF );
  525. }
  526. }
  527. }
  528. /**
  529. * Finds and stores references to DOM elements which are
  530. * required by the presentation. If a required element is
  531. * not found, it is created.
  532. */
  533. function setupDOM() {
  534. // Prevent transitions while we're loading
  535. dom.slides.classList.add( 'no-transition' );
  536. if( isMobileDevice ) {
  537. dom.wrapper.classList.add( 'no-hover' );
  538. }
  539. else {
  540. dom.wrapper.classList.remove( 'no-hover' );
  541. }
  542. if( /iphone/gi.test( UA ) ) {
  543. dom.wrapper.classList.add( 'ua-iphone' );
  544. }
  545. else {
  546. dom.wrapper.classList.remove( 'ua-iphone' );
  547. }
  548. // Background element
  549. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  550. // Progress bar
  551. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  552. dom.progressbar = dom.progress.querySelector( 'span' );
  553. // Arrow controls
  554. dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls',
  555. '<button class="navigate-left" aria-label="previous slide"><div class="controls-arrow"></div></button>' +
  556. '<button class="navigate-right" aria-label="next slide"><div class="controls-arrow"></div></button>' +
  557. '<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>' +
  558. '<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></button>' );
  559. // Slide number
  560. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  561. // Element containing notes that are visible to the audience
  562. dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
  563. dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
  564. dom.speakerNotes.setAttribute( 'tabindex', '0' );
  565. // Overlay graphic which is displayed during the paused mode
  566. dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class="resume-button">Resume presentation</button>' : null );
  567. dom.wrapper.setAttribute( 'role', 'application' );
  568. // There can be multiple instances of controls throughout the page
  569. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  570. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  571. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  572. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  573. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  574. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  575. // The right and down arrows in the standard reveal.js controls
  576. dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' );
  577. dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' );
  578. dom.statusDiv = createStatusDiv();
  579. }
  580. /**
  581. * Creates a hidden div with role aria-live to announce the
  582. * current slide content. Hide the div off-screen to make it
  583. * available only to Assistive Technologies.
  584. *
  585. * @return {HTMLElement}
  586. */
  587. function createStatusDiv() {
  588. var statusDiv = document.getElementById( 'aria-status-div' );
  589. if( !statusDiv ) {
  590. statusDiv = document.createElement( 'div' );
  591. statusDiv.style.position = 'absolute';
  592. statusDiv.style.height = '1px';
  593. statusDiv.style.width = '1px';
  594. statusDiv.style.overflow = 'hidden';
  595. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  596. statusDiv.setAttribute( 'id', 'aria-status-div' );
  597. statusDiv.setAttribute( 'aria-live', 'polite' );
  598. statusDiv.setAttribute( 'aria-atomic','true' );
  599. dom.wrapper.appendChild( statusDiv );
  600. }
  601. return statusDiv;
  602. }
  603. /**
  604. * Converts the given HTML element into a string of text
  605. * that can be announced to a screen reader. Hidden
  606. * elements are excluded.
  607. */
  608. function getStatusText( node ) {
  609. var text = '';
  610. // Text node
  611. if( node.nodeType === 3 ) {
  612. text += node.textContent;
  613. }
  614. // Element node
  615. else if( node.nodeType === 1 ) {
  616. var isAriaHidden = node.getAttribute( 'aria-hidden' );
  617. var isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
  618. if( isAriaHidden !== 'true' && !isDisplayHidden ) {
  619. toArray( node.childNodes ).forEach( function( child ) {
  620. text += getStatusText( child );
  621. } );
  622. }
  623. }
  624. return text;
  625. }
  626. /**
  627. * Configures the presentation for printing to a static
  628. * PDF.
  629. */
  630. function setupPDF() {
  631. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  632. // Dimensions of the PDF pages
  633. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  634. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  635. // Dimensions of slides within the pages
  636. var slideWidth = slideSize.width,
  637. slideHeight = slideSize.height;
  638. // Let the browser know what page size we want to print
  639. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
  640. // Limit the size of certain elements to the dimensions of the slide
  641. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  642. document.body.classList.add( 'print-pdf' );
  643. document.body.style.width = pageWidth + 'px';
  644. document.body.style.height = pageHeight + 'px';
  645. // Make sure stretch elements fit on slide
  646. layoutSlideContents( slideWidth, slideHeight );
  647. // Add each slide's index as attributes on itself, we need these
  648. // indices to generate slide numbers below
  649. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  650. hslide.setAttribute( 'data-index-h', h );
  651. if( hslide.classList.contains( 'stack' ) ) {
  652. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  653. vslide.setAttribute( 'data-index-h', h );
  654. vslide.setAttribute( 'data-index-v', v );
  655. } );
  656. }
  657. } );
  658. // Slide and slide background layout
  659. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  660. // Vertical stacks are not centred since their section
  661. // children will be
  662. if( slide.classList.contains( 'stack' ) === false ) {
  663. // Center the slide inside of the page, giving the slide some margin
  664. var left = ( pageWidth - slideWidth ) / 2,
  665. top = ( pageHeight - slideHeight ) / 2;
  666. var contentHeight = slide.scrollHeight;
  667. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  668. // Adhere to configured pages per slide limit
  669. numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
  670. // Center slides vertically
  671. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  672. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  673. }
  674. // Wrap the slide in a page element and hide its overflow
  675. // so that no page ever flows onto another
  676. var page = document.createElement( 'div' );
  677. page.className = 'pdf-page';
  678. page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
  679. slide.parentNode.insertBefore( page, slide );
  680. page.appendChild( slide );
  681. // Position the slide inside of the page
  682. slide.style.left = left + 'px';
  683. slide.style.top = top + 'px';
  684. slide.style.width = slideWidth + 'px';
  685. if( slide.slideBackgroundElement ) {
  686. page.insertBefore( slide.slideBackgroundElement, slide );
  687. }
  688. // Inject notes if `showNotes` is enabled
  689. if( config.showNotes ) {
  690. // Are there notes for this slide?
  691. var notes = getSlideNotes( slide );
  692. if( notes ) {
  693. var notesSpacing = 8;
  694. var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
  695. var notesElement = document.createElement( 'div' );
  696. notesElement.classList.add( 'speaker-notes' );
  697. notesElement.classList.add( 'speaker-notes-pdf' );
  698. notesElement.setAttribute( 'data-layout', notesLayout );
  699. notesElement.innerHTML = notes;
  700. if( notesLayout === 'separate-page' ) {
  701. page.parentNode.insertBefore( notesElement, page.nextSibling );
  702. }
  703. else {
  704. notesElement.style.left = notesSpacing + 'px';
  705. notesElement.style.bottom = notesSpacing + 'px';
  706. notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
  707. page.appendChild( notesElement );
  708. }
  709. }
  710. }
  711. // Inject slide numbers if `slideNumbers` are enabled
  712. if( config.slideNumber && /all|print/i.test( config.showSlideNumber ) ) {
  713. var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1,
  714. slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1;
  715. var numberElement = document.createElement( 'div' );
  716. numberElement.classList.add( 'slide-number' );
  717. numberElement.classList.add( 'slide-number-pdf' );
  718. numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV );
  719. page.appendChild( numberElement );
  720. }
  721. // Copy page and show fragments one after another
  722. if( config.pdfSeparateFragments ) {
  723. // Each fragment 'group' is an array containing one or more
  724. // fragments. Multiple fragments that appear at the same time
  725. // are part of the same group.
  726. var fragmentGroups = sortFragments( page.querySelectorAll( '.fragment' ), true );
  727. var previousFragmentStep;
  728. var previousPage;
  729. fragmentGroups.forEach( function( fragments ) {
  730. // Remove 'current-fragment' from the previous group
  731. if( previousFragmentStep ) {
  732. previousFragmentStep.forEach( function( fragment ) {
  733. fragment.classList.remove( 'current-fragment' );
  734. } );
  735. }
  736. // Show the fragments for the current index
  737. fragments.forEach( function( fragment ) {
  738. fragment.classList.add( 'visible', 'current-fragment' );
  739. } );
  740. // Create a separate page for the current fragment state
  741. var clonedPage = page.cloneNode( true );
  742. page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
  743. previousFragmentStep = fragments;
  744. previousPage = clonedPage;
  745. } );
  746. // Reset the first/original page so that all fragments are hidden
  747. fragmentGroups.forEach( function( fragments ) {
  748. fragments.forEach( function( fragment ) {
  749. fragment.classList.remove( 'visible', 'current-fragment' );
  750. } );
  751. } );
  752. }
  753. // Show all fragments
  754. else {
  755. toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) {
  756. fragment.classList.add( 'visible' );
  757. } );
  758. }
  759. }
  760. } );
  761. // Notify subscribers that the PDF layout is good to go
  762. dispatchEvent( 'pdf-ready' );
  763. }
  764. /**
  765. * This is an unfortunate necessity. Some actions – such as
  766. * an input field being focused in an iframe or using the
  767. * keyboard to expand text selection beyond the bounds of
  768. * a slide – can trigger our content to be pushed out of view.
  769. * This scrolling can not be prevented by hiding overflow in
  770. * CSS (we already do) so we have to resort to repeatedly
  771. * checking if the slides have been offset :(
  772. */
  773. function setupScrollPrevention() {
  774. setInterval( function() {
  775. if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
  776. dom.wrapper.scrollTop = 0;
  777. dom.wrapper.scrollLeft = 0;
  778. }
  779. }, 1000 );
  780. }
  781. /**
  782. * Creates an HTML element and returns a reference to it.
  783. * If the element already exists the existing instance will
  784. * be returned.
  785. *
  786. * @param {HTMLElement} container
  787. * @param {string} tagname
  788. * @param {string} classname
  789. * @param {string} innerHTML
  790. *
  791. * @return {HTMLElement}
  792. */
  793. function createSingletonNode( container, tagname, classname, innerHTML ) {
  794. // Find all nodes matching the description
  795. var nodes = container.querySelectorAll( '.' + classname );
  796. // Check all matches to find one which is a direct child of
  797. // the specified container
  798. for( var i = 0; i < nodes.length; i++ ) {
  799. var testNode = nodes[i];
  800. if( testNode.parentNode === container ) {
  801. return testNode;
  802. }
  803. }
  804. // If no node was found, create it now
  805. var node = document.createElement( tagname );
  806. node.className = classname;
  807. if( typeof innerHTML === 'string' ) {
  808. node.innerHTML = innerHTML;
  809. }
  810. container.appendChild( node );
  811. return node;
  812. }
  813. /**
  814. * Creates the slide background elements and appends them
  815. * to the background container. One element is created per
  816. * slide no matter if the given slide has visible background.
  817. */
  818. function createBackgrounds() {
  819. var printMode = isPrintingPDF();
  820. // Clear prior backgrounds
  821. dom.background.innerHTML = '';
  822. dom.background.classList.add( 'no-transition' );
  823. // Iterate over all horizontal slides
  824. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  825. var backgroundStack = createBackground( slideh, dom.background );
  826. // Iterate over all vertical slides
  827. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  828. createBackground( slidev, backgroundStack );
  829. backgroundStack.classList.add( 'stack' );
  830. } );
  831. } );
  832. // Add parallax background if specified
  833. if( config.parallaxBackgroundImage ) {
  834. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  835. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  836. dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat;
  837. dom.background.style.backgroundPosition = config.parallaxBackgroundPosition;
  838. // Make sure the below properties are set on the element - these properties are
  839. // needed for proper transitions to be set on the element via CSS. To remove
  840. // annoying background slide-in effect when the presentation starts, apply
  841. // these properties after short time delay
  842. setTimeout( function() {
  843. dom.wrapper.classList.add( 'has-parallax-background' );
  844. }, 1 );
  845. }
  846. else {
  847. dom.background.style.backgroundImage = '';
  848. dom.wrapper.classList.remove( 'has-parallax-background' );
  849. }
  850. }
  851. /**
  852. * Creates a background for the given slide.
  853. *
  854. * @param {HTMLElement} slide
  855. * @param {HTMLElement} container The element that the background
  856. * should be appended to
  857. * @return {HTMLElement} New background div
  858. */
  859. function createBackground( slide, container ) {
  860. // Main slide background element
  861. var element = document.createElement( 'div' );
  862. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  863. // Inner background element that wraps images/videos/iframes
  864. var contentElement = document.createElement( 'div' );
  865. contentElement.className = 'slide-background-content';
  866. element.appendChild( contentElement );
  867. container.appendChild( element );
  868. slide.slideBackgroundElement = element;
  869. slide.slideBackgroundContentElement = contentElement;
  870. // Syncs the background to reflect all current background settings
  871. syncBackground( slide );
  872. return element;
  873. }
  874. /**
  875. * Renders all of the visual properties of a slide background
  876. * based on the various background attributes.
  877. *
  878. * @param {HTMLElement} slide
  879. */
  880. function syncBackground( slide ) {
  881. var element = slide.slideBackgroundElement,
  882. contentElement = slide.slideBackgroundContentElement;
  883. // Reset the prior background state in case this is not the
  884. // initial sync
  885. slide.classList.remove( 'has-dark-background' );
  886. slide.classList.remove( 'has-light-background' );
  887. element.removeAttribute( 'data-loaded' );
  888. element.removeAttribute( 'data-background-hash' );
  889. element.removeAttribute( 'data-background-size' );
  890. element.removeAttribute( 'data-background-transition' );
  891. element.style.backgroundColor = '';
  892. contentElement.style.backgroundSize = '';
  893. contentElement.style.backgroundRepeat = '';
  894. contentElement.style.backgroundPosition = '';
  895. contentElement.style.backgroundImage = '';
  896. contentElement.style.opacity = '';
  897. contentElement.innerHTML = '';
  898. var data = {
  899. background: slide.getAttribute( 'data-background' ),
  900. backgroundSize: slide.getAttribute( 'data-background-size' ),
  901. backgroundImage: slide.getAttribute( 'data-background-image' ),
  902. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  903. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  904. backgroundColor: slide.getAttribute( 'data-background-color' ),
  905. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  906. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  907. backgroundTransition: slide.getAttribute( 'data-background-transition' ),
  908. backgroundOpacity: slide.getAttribute( 'data-background-opacity' )
  909. };
  910. if( data.background ) {
  911. // Auto-wrap image urls in url(...)
  912. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) {
  913. slide.setAttribute( 'data-background-image', data.background );
  914. }
  915. else {
  916. element.style.background = data.background;
  917. }
  918. }
  919. // Create a hash for this combination of background settings.
  920. // This is used to determine when two slide backgrounds are
  921. // the same.
  922. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  923. element.setAttribute( 'data-background-hash', data.background +
  924. data.backgroundSize +
  925. data.backgroundImage +
  926. data.backgroundVideo +
  927. data.backgroundIframe +
  928. data.backgroundColor +
  929. data.backgroundRepeat +
  930. data.backgroundPosition +
  931. data.backgroundTransition +
  932. data.backgroundOpacity );
  933. }
  934. // Additional and optional background properties
  935. if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );
  936. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  937. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  938. if( slide.hasAttribute( 'data-preload' ) ) element.setAttribute( 'data-preload', '' );
  939. // Background image options are set on the content wrapper
  940. if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
  941. if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;
  942. if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;
  943. if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;
  944. // If this slide has a background color, we add a class that
  945. // signals if it is light or dark. If the slide has no background
  946. // color, no class will be added
  947. var contrastColor = data.backgroundColor;
  948. // If no bg color was found, check the computed background
  949. if( !contrastColor ) {
  950. var computedBackgroundStyle = window.getComputedStyle( element );
  951. if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
  952. contrastColor = computedBackgroundStyle.backgroundColor;
  953. }
  954. }
  955. if( contrastColor ) {
  956. var rgb = colorToRgb( contrastColor );
  957. // Ignore fully transparent backgrounds. Some browsers return
  958. // rgba(0,0,0,0) when reading the computed background color of
  959. // an element with no background
  960. if( rgb && rgb.a !== 0 ) {
  961. if( colorBrightness( contrastColor ) < 128 ) {
  962. slide.classList.add( 'has-dark-background' );
  963. }
  964. else {
  965. slide.classList.add( 'has-light-background' );
  966. }
  967. }
  968. }
  969. }
  970. /**
  971. * Registers a listener to postMessage events, this makes it
  972. * possible to call all reveal.js API methods from another
  973. * window. For example:
  974. *
  975. * revealWindow.postMessage( JSON.stringify({
  976. * method: 'slide',
  977. * args: [ 2 ]
  978. * }), '*' );
  979. */
  980. function setupPostMessage() {
  981. if( config.postMessage ) {
  982. window.addEventListener( 'message', function ( event ) {
  983. var data = event.data;
  984. // Make sure we're dealing with JSON
  985. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  986. data = JSON.parse( data );
  987. // Check if the requested method can be found
  988. if( data.method && typeof Reveal[data.method] === 'function' ) {
  989. var result = Reveal[data.method].apply( Reveal, data.args );
  990. // Dispatch a postMessage event with the returned value from
  991. // our method invocation for getter functions
  992. dispatchPostMessage( 'callback', { method: data.method, result: result } );
  993. }
  994. }
  995. }, false );
  996. }
  997. }
  998. /**
  999. * Applies the configuration settings from the config
  1000. * object. May be called multiple times.
  1001. *
  1002. * @param {object} options
  1003. */
  1004. function configure( options ) {
  1005. var oldTransition = config.transition;
  1006. // New config options may be passed when this method
  1007. // is invoked through the API after initialization
  1008. if( typeof options === 'object' ) extend( config, options );
  1009. // Abort if reveal.js hasn't finished loading, config
  1010. // changes will be applied automatically once loading
  1011. // finishes
  1012. if( loaded === false ) return;
  1013. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  1014. // Remove the previously configured transition class
  1015. dom.wrapper.classList.remove( oldTransition );
  1016. // Force linear transition based on browser capabilities
  1017. if( features.transforms3d === false ) config.transition = 'linear';
  1018. dom.wrapper.classList.add( config.transition );
  1019. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  1020. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  1021. dom.controls.style.display = config.controls ? 'block' : 'none';
  1022. dom.progress.style.display = config.progress ? 'block' : 'none';
  1023. dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout );
  1024. dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
  1025. if( config.shuffle ) {
  1026. shuffle();
  1027. }
  1028. if( config.rtl ) {
  1029. dom.wrapper.classList.add( 'rtl' );
  1030. }
  1031. else {
  1032. dom.wrapper.classList.remove( 'rtl' );
  1033. }
  1034. if( config.center ) {
  1035. dom.wrapper.classList.add( 'center' );
  1036. }
  1037. else {
  1038. dom.wrapper.classList.remove( 'center' );
  1039. }
  1040. // Exit the paused mode if it was configured off
  1041. if( config.pause === false ) {
  1042. resume();
  1043. }
  1044. if( config.showNotes ) {
  1045. dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
  1046. }
  1047. if( config.mouseWheel ) {
  1048. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1049. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1050. }
  1051. else {
  1052. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1053. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1054. }
  1055. // Rolling 3D links
  1056. if( config.rollingLinks ) {
  1057. enableRollingLinks();
  1058. }
  1059. else {
  1060. disableRollingLinks();
  1061. }
  1062. // Auto-hide the mouse pointer when its inactive
  1063. if( config.hideInactiveCursor ) {
  1064. document.addEventListener( 'mousemove', onDocumentCursorActive, false );
  1065. document.addEventListener( 'mousedown', onDocumentCursorActive, false );
  1066. }
  1067. else {
  1068. showCursor();
  1069. document.removeEventListener( 'mousemove', onDocumentCursorActive, false );
  1070. document.removeEventListener( 'mousedown', onDocumentCursorActive, false );
  1071. }
  1072. // Iframe link previews
  1073. if( config.previewLinks ) {
  1074. enablePreviewLinks();
  1075. disablePreviewLinks( '[data-preview-link=false]' );
  1076. }
  1077. else {
  1078. disablePreviewLinks();
  1079. enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
  1080. }
  1081. // Remove existing auto-slide controls
  1082. if( autoSlidePlayer ) {
  1083. autoSlidePlayer.destroy();
  1084. autoSlidePlayer = null;
  1085. }
  1086. // Generate auto-slide controls if needed
  1087. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  1088. autoSlidePlayer = new Playback( dom.wrapper, function() {
  1089. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  1090. } );
  1091. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  1092. autoSlidePaused = false;
  1093. }
  1094. // When fragments are turned off they should be visible
  1095. if( config.fragments === false ) {
  1096. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  1097. element.classList.add( 'visible' );
  1098. element.classList.remove( 'current-fragment' );
  1099. } );
  1100. }
  1101. // Slide numbers
  1102. var slideNumberDisplay = 'none';
  1103. if( config.slideNumber && !isPrintingPDF() ) {
  1104. if( config.showSlideNumber === 'all' ) {
  1105. slideNumberDisplay = 'block';
  1106. }
  1107. else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) {
  1108. slideNumberDisplay = 'block';
  1109. }
  1110. }
  1111. dom.slideNumber.style.display = slideNumberDisplay;
  1112. // Add the navigation mode to the DOM so we can adjust styling
  1113. if( config.navigationMode !== 'default' ) {
  1114. dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );
  1115. }
  1116. else {
  1117. dom.wrapper.removeAttribute( 'data-navigation-mode' );
  1118. }
  1119. // Define our contextual list of keyboard shortcuts
  1120. if( config.navigationMode === 'linear' ) {
  1121. keyboardShortcuts['&#8594; , &#8595; , SPACE , N , L , J'] = 'Next slide';
  1122. keyboardShortcuts['&#8592; , &#8593; , P , H , K'] = 'Previous slide';
  1123. }
  1124. else {
  1125. keyboardShortcuts['N , SPACE'] = 'Next slide';
  1126. keyboardShortcuts['P'] = 'Previous slide';
  1127. keyboardShortcuts['&#8592; , H'] = 'Navigate left';
  1128. keyboardShortcuts['&#8594; , L'] = 'Navigate right';
  1129. keyboardShortcuts['&#8593; , K'] = 'Navigate up';
  1130. keyboardShortcuts['&#8595; , J'] = 'Navigate down';
  1131. }
  1132. keyboardShortcuts['Home , Shift &#8592;'] = 'First slide';
  1133. keyboardShortcuts['End , Shift &#8594;'] = 'Last slide';
  1134. keyboardShortcuts['B , .'] = 'Pause';
  1135. keyboardShortcuts['F'] = 'Fullscreen';
  1136. keyboardShortcuts['ESC, O'] = 'Slide overview';
  1137. sync();
  1138. }
  1139. /**
  1140. * Binds all event listeners.
  1141. */
  1142. function addEventListeners() {
  1143. eventsAreBound = true;
  1144. window.addEventListener( 'hashchange', onWindowHashChange, false );
  1145. window.addEventListener( 'resize', onWindowResize, false );
  1146. if( config.touch ) {
  1147. if( 'onpointerdown' in window ) {
  1148. // Use W3C pointer events
  1149. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  1150. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  1151. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  1152. }
  1153. else if( window.navigator.msPointerEnabled ) {
  1154. // IE 10 uses prefixed version of pointer events
  1155. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  1156. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  1157. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  1158. }
  1159. else {
  1160. // Fall back to touch events
  1161. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  1162. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  1163. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  1164. }
  1165. }
  1166. if( config.keyboard ) {
  1167. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  1168. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  1169. }
  1170. if( config.progress && dom.progress ) {
  1171. dom.progress.addEventListener( 'click', onProgressClicked, false );
  1172. }
  1173. dom.pauseOverlay.addEventListener( 'click', resume, false );
  1174. if( config.focusBodyOnPageVisibilityChange ) {
  1175. var visibilityChange;
  1176. if( 'hidden' in document ) {
  1177. visibilityChange = 'visibilitychange';
  1178. }
  1179. else if( 'msHidden' in document ) {
  1180. visibilityChange = 'msvisibilitychange';
  1181. }
  1182. else if( 'webkitHidden' in document ) {
  1183. visibilityChange = 'webkitvisibilitychange';
  1184. }
  1185. if( visibilityChange ) {
  1186. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  1187. }
  1188. }
  1189. // Listen to both touch and click events, in case the device
  1190. // supports both
  1191. var pointerEvents = [ 'touchstart', 'click' ];
  1192. // Only support touch for Android, fixes double navigations in
  1193. // stock browser
  1194. if( UA.match( /android/gi ) ) {
  1195. pointerEvents = [ 'touchstart' ];
  1196. }
  1197. pointerEvents.forEach( function( eventName ) {
  1198. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  1199. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  1200. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  1201. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  1202. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  1203. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  1204. } );
  1205. }
  1206. /**
  1207. * Unbinds all event listeners.
  1208. */
  1209. function removeEventListeners() {
  1210. eventsAreBound = false;
  1211. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  1212. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  1213. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  1214. window.removeEventListener( 'resize', onWindowResize, false );
  1215. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  1216. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  1217. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  1218. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  1219. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  1220. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  1221. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  1222. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  1223. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  1224. dom.pauseOverlay.removeEventListener( 'click', resume, false );
  1225. if ( config.progress && dom.progress ) {
  1226. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  1227. }
  1228. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  1229. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  1230. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  1231. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  1232. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  1233. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  1234. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  1235. } );
  1236. }
  1237. /**
  1238. * Registers a new plugin with this reveal.js instance.
  1239. *
  1240. * reveal.js waits for all regisered plugins to initialize
  1241. * before considering itself ready, as long as the plugin
  1242. * is registered before calling `Reveal.initialize()`.
  1243. */
  1244. function registerPlugin( id, plugin ) {
  1245. if( plugins[id] === undefined ) {
  1246. plugins[id] = plugin;
  1247. // If a plugin is registered after reveal.js is loaded,
  1248. // initialize it right away
  1249. if( loaded && typeof plugin.init === 'function' ) {
  1250. plugin.init();
  1251. }
  1252. }
  1253. else {
  1254. console.warn( 'reveal.js: "'+ id +'" plugin has already been registered' );
  1255. }
  1256. }
  1257. /**
  1258. * Checks if a specific plugin has been registered.
  1259. *
  1260. * @param {String} id Unique plugin identifier
  1261. */
  1262. function hasPlugin( id ) {
  1263. return !!plugins[id];
  1264. }
  1265. /**
  1266. * Returns the specific plugin instance, if a plugin
  1267. * with the given ID has been registered.
  1268. *
  1269. * @param {String} id Unique plugin identifier
  1270. */
  1271. function getPlugin( id ) {
  1272. return plugins[id];
  1273. }
  1274. /**
  1275. * Add a custom key binding with optional description to
  1276. * be added to the help screen.
  1277. */
  1278. function addKeyBinding( binding, callback ) {
  1279. if( typeof binding === 'object' && binding.keyCode ) {
  1280. registeredKeyBindings[binding.keyCode] = {
  1281. callback: callback,
  1282. key: binding.key,
  1283. description: binding.description
  1284. };
  1285. }
  1286. else {
  1287. registeredKeyBindings[binding] = {
  1288. callback: callback,
  1289. key: null,
  1290. description: null
  1291. };
  1292. }
  1293. }
  1294. /**
  1295. * Removes the specified custom key binding.
  1296. */
  1297. function removeKeyBinding( keyCode ) {
  1298. delete registeredKeyBindings[keyCode];
  1299. }
  1300. /**
  1301. * Extend object a with the properties of object b.
  1302. * If there's a conflict, object b takes precedence.
  1303. *
  1304. * @param {object} a
  1305. * @param {object} b
  1306. */
  1307. function extend( a, b ) {
  1308. for( var i in b ) {
  1309. a[ i ] = b[ i ];
  1310. }
  1311. return a;
  1312. }
  1313. /**
  1314. * Converts the target object to an array.
  1315. *
  1316. * @param {object} o
  1317. * @return {object[]}
  1318. */
  1319. function toArray( o ) {
  1320. return Array.prototype.slice.call( o );
  1321. }
  1322. /**
  1323. * Utility for deserializing a value.
  1324. *
  1325. * @param {*} value
  1326. * @return {*}
  1327. */
  1328. function deserialize( value ) {
  1329. if( typeof value === 'string' ) {
  1330. if( value === 'null' ) return null;
  1331. else if( value === 'true' ) return true;
  1332. else if( value === 'false' ) return false;
  1333. else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
  1334. }
  1335. return value;
  1336. }
  1337. /**
  1338. * Measures the distance in pixels between point a
  1339. * and point b.
  1340. *
  1341. * @param {object} a point with x/y properties
  1342. * @param {object} b point with x/y properties
  1343. *
  1344. * @return {number}
  1345. */
  1346. function distanceBetween( a, b ) {
  1347. var dx = a.x - b.x,
  1348. dy = a.y - b.y;
  1349. return Math.sqrt( dx*dx + dy*dy );
  1350. }
  1351. /**
  1352. * Applies a CSS transform to the target element.
  1353. *
  1354. * @param {HTMLElement} element
  1355. * @param {string} transform
  1356. */
  1357. function transformElement( element, transform ) {
  1358. element.style.WebkitTransform = transform;
  1359. element.style.MozTransform = transform;
  1360. element.style.msTransform = transform;
  1361. element.style.transform = transform;
  1362. }
  1363. /**
  1364. * Applies CSS transforms to the slides container. The container
  1365. * is transformed from two separate sources: layout and the overview
  1366. * mode.
  1367. *
  1368. * @param {object} transforms
  1369. */
  1370. function transformSlides( transforms ) {
  1371. // Pick up new transforms from arguments
  1372. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  1373. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  1374. // Apply the transforms to the slides container
  1375. if( slidesTransform.layout ) {
  1376. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  1377. }
  1378. else {
  1379. transformElement( dom.slides, slidesTransform.overview );
  1380. }
  1381. }
  1382. /**
  1383. * Injects the given CSS styles into the DOM.
  1384. *
  1385. * @param {string} value
  1386. */
  1387. function injectStyleSheet( value ) {
  1388. var tag = document.createElement( 'style' );
  1389. tag.type = 'text/css';
  1390. if( tag.styleSheet ) {
  1391. tag.styleSheet.cssText = value;
  1392. }
  1393. else {
  1394. tag.appendChild( document.createTextNode( value ) );
  1395. }
  1396. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  1397. }
  1398. /**
  1399. * Find the closest parent that matches the given
  1400. * selector.
  1401. *
  1402. * @param {HTMLElement} target The child element
  1403. * @param {String} selector The CSS selector to match
  1404. * the parents against
  1405. *
  1406. * @return {HTMLElement} The matched parent or null
  1407. * if no matching parent was found
  1408. */
  1409. function closestParent( target, selector ) {
  1410. var parent = target.parentNode;
  1411. while( parent ) {
  1412. // There's some overhead doing this each time, we don't
  1413. // want to rewrite the element prototype but should still
  1414. // be enough to feature detect once at startup...
  1415. var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
  1416. // If we find a match, we're all set
  1417. if( matchesMethod && matchesMethod.call( parent, selector ) ) {
  1418. return parent;
  1419. }
  1420. // Keep searching
  1421. parent = parent.parentNode;
  1422. }
  1423. return null;
  1424. }
  1425. /**
  1426. * Converts various color input formats to an {r:0,g:0,b:0} object.
  1427. *
  1428. * @param {string} color The string representation of a color
  1429. * @example
  1430. * colorToRgb('#000');
  1431. * @example
  1432. * colorToRgb('#000000');
  1433. * @example
  1434. * colorToRgb('rgb(0,0,0)');
  1435. * @example
  1436. * colorToRgb('rgba(0,0,0)');
  1437. *
  1438. * @return {{r: number, g: number, b: number, [a]: number}|null}
  1439. */
  1440. function colorToRgb( color ) {
  1441. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  1442. if( hex3 && hex3[1] ) {
  1443. hex3 = hex3[1];
  1444. return {
  1445. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  1446. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  1447. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  1448. };
  1449. }
  1450. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  1451. if( hex6 && hex6[1] ) {
  1452. hex6 = hex6[1];
  1453. return {
  1454. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  1455. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  1456. b: parseInt( hex6.substr( 4, 2 ), 16 )
  1457. };
  1458. }
  1459. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  1460. if( rgb ) {
  1461. return {
  1462. r: parseInt( rgb[1], 10 ),
  1463. g: parseInt( rgb[2], 10 ),
  1464. b: parseInt( rgb[3], 10 )
  1465. };
  1466. }
  1467. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  1468. if( rgba ) {
  1469. return {
  1470. r: parseInt( rgba[1], 10 ),
  1471. g: parseInt( rgba[2], 10 ),
  1472. b: parseInt( rgba[3], 10 ),
  1473. a: parseFloat( rgba[4] )
  1474. };
  1475. }
  1476. return null;
  1477. }
  1478. /**
  1479. * Calculates brightness on a scale of 0-255.
  1480. *
  1481. * @param {string} color See colorToRgb for supported formats.
  1482. * @see {@link colorToRgb}
  1483. */
  1484. function colorBrightness( color ) {
  1485. if( typeof color === 'string' ) color = colorToRgb( color );
  1486. if( color ) {
  1487. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  1488. }
  1489. return null;
  1490. }
  1491. /**
  1492. * Returns the remaining height within the parent of the
  1493. * target element.
  1494. *
  1495. * remaining height = [ configured parent height ] - [ current parent height ]
  1496. *
  1497. * @param {HTMLElement} element
  1498. * @param {number} [height]
  1499. */
  1500. function getRemainingHeight( element, height ) {
  1501. height = height || 0;
  1502. if( element ) {
  1503. var newHeight, oldHeight = element.style.height;
  1504. // Change the .stretch element height to 0 in order find the height of all
  1505. // the other elements
  1506. element.style.height = '0px';
  1507. // In Overview mode, the parent (.slide) height is set of 700px.
  1508. // Restore it temporarily to its natural height.
  1509. element.parentNode.style.height = 'auto';
  1510. newHeight = height - element.parentNode.offsetHeight;
  1511. // Restore the old height, just in case
  1512. element.style.height = oldHeight + 'px';
  1513. // Clear the parent (.slide) height. .removeProperty works in IE9+
  1514. element.parentNode.style.removeProperty('height');
  1515. return newHeight;
  1516. }
  1517. return height;
  1518. }
  1519. /**
  1520. * Checks if this instance is being used to print a PDF.
  1521. */
  1522. function isPrintingPDF() {
  1523. return ( /print-pdf/gi ).test( window.location.search );
  1524. }
  1525. /**
  1526. * Hides the address bar if we're on a mobile device.
  1527. */
  1528. function hideAddressBar() {
  1529. if( config.hideAddressBar && isMobileDevice ) {
  1530. // Events that should trigger the address bar to hide
  1531. window.addEventListener( 'load', removeAddressBar, false );
  1532. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1533. }
  1534. }
  1535. /**
  1536. * Causes the address bar to hide on mobile devices,
  1537. * more vertical space ftw.
  1538. */
  1539. function removeAddressBar() {
  1540. setTimeout( function() {
  1541. window.scrollTo( 0, 1 );
  1542. }, 10 );
  1543. }
  1544. /**
  1545. * Dispatches an event of the specified type from the
  1546. * reveal DOM element.
  1547. */
  1548. function dispatchEvent( type, args ) {
  1549. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1550. event.initEvent( type, true, true );
  1551. extend( event, args );
  1552. dom.wrapper.dispatchEvent( event );
  1553. // If we're in an iframe, post each reveal.js event to the
  1554. // parent window. Used by the notes plugin
  1555. dispatchPostMessage( type );
  1556. }
  1557. /**
  1558. * Dispatched a postMessage of the given type from our window.
  1559. */
  1560. function dispatchPostMessage( type, data ) {
  1561. if( config.postMessageEvents && window.parent !== window.self ) {
  1562. var message = {
  1563. namespace: 'reveal',
  1564. eventName: type,
  1565. state: getState()
  1566. };
  1567. extend( message, data );
  1568. window.parent.postMessage( JSON.stringify( message ), '*' );
  1569. }
  1570. }
  1571. /**
  1572. * Wrap all links in 3D goodness.
  1573. */
  1574. function enableRollingLinks() {
  1575. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1576. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1577. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1578. var anchor = anchors[i];
  1579. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1580. var span = document.createElement('span');
  1581. span.setAttribute('data-title', anchor.text);
  1582. span.innerHTML = anchor.innerHTML;
  1583. anchor.classList.add( 'roll' );
  1584. anchor.innerHTML = '';
  1585. anchor.appendChild(span);
  1586. }
  1587. }
  1588. }
  1589. }
  1590. /**
  1591. * Unwrap all 3D links.
  1592. */
  1593. function disableRollingLinks() {
  1594. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1595. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1596. var anchor = anchors[i];
  1597. var span = anchor.querySelector( 'span' );
  1598. if( span ) {
  1599. anchor.classList.remove( 'roll' );
  1600. anchor.innerHTML = span.innerHTML;
  1601. }
  1602. }
  1603. }
  1604. /**
  1605. * Bind preview frame links.
  1606. *
  1607. * @param {string} [selector=a] - selector for anchors
  1608. */
  1609. function enablePreviewLinks( selector ) {
  1610. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1611. anchors.forEach( function( element ) {
  1612. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1613. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1614. }
  1615. } );
  1616. }
  1617. /**
  1618. * Unbind preview frame links.
  1619. */
  1620. function disablePreviewLinks( selector ) {
  1621. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1622. anchors.forEach( function( element ) {
  1623. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1624. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1625. }
  1626. } );
  1627. }
  1628. /**
  1629. * Opens a preview window for the target URL.
  1630. *
  1631. * @param {string} url - url for preview iframe src
  1632. */
  1633. function showPreview( url ) {
  1634. closeOverlay();
  1635. dom.overlay = document.createElement( 'div' );
  1636. dom.overlay.classList.add( 'overlay' );
  1637. dom.overlay.classList.add( 'overlay-preview' );
  1638. dom.wrapper.appendChild( dom.overlay );
  1639. dom.overlay.innerHTML = [
  1640. '<header>',
  1641. '<a class="close" href="#"><span class="icon"></span></a>',
  1642. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1643. '</header>',
  1644. '<div class="spinner"></div>',
  1645. '<div class="viewport">',
  1646. '<iframe src="'+ url +'"></iframe>',
  1647. '<small class="viewport-inner">',
  1648. '<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>',
  1649. '</small>',
  1650. '</div>'
  1651. ].join('');
  1652. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1653. dom.overlay.classList.add( 'loaded' );
  1654. }, false );
  1655. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1656. closeOverlay();
  1657. event.preventDefault();
  1658. }, false );
  1659. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1660. closeOverlay();
  1661. }, false );
  1662. setTimeout( function() {
  1663. dom.overlay.classList.add( 'visible' );
  1664. }, 1 );
  1665. }
  1666. /**
  1667. * Open or close help overlay window.
  1668. *
  1669. * @param {Boolean} [override] Flag which overrides the
  1670. * toggle logic and forcibly sets the desired state. True means
  1671. * help is open, false means it's closed.
  1672. */
  1673. function toggleHelp( override ){
  1674. if( typeof override === 'boolean' ) {
  1675. override ? showHelp() : closeOverlay();
  1676. }
  1677. else {
  1678. if( dom.overlay ) {
  1679. closeOverlay();
  1680. }
  1681. else {
  1682. showHelp();
  1683. }
  1684. }
  1685. }
  1686. /**
  1687. * Opens an overlay window with help material.
  1688. */
  1689. function showHelp() {
  1690. if( config.help ) {
  1691. closeOverlay();
  1692. dom.overlay = document.createElement( 'div' );
  1693. dom.overlay.classList.add( 'overlay' );
  1694. dom.overlay.classList.add( 'overlay-help' );
  1695. dom.wrapper.appendChild( dom.overlay );
  1696. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1697. html += '<table><th>KEY</th><th>ACTION</th>';
  1698. for( var key in keyboardShortcuts ) {
  1699. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1700. }
  1701. // Add custom key bindings that have associated descriptions
  1702. for( var binding in registeredKeyBindings ) {
  1703. if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) {
  1704. html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</td></tr>';
  1705. }
  1706. }
  1707. html += '</table>';
  1708. dom.overlay.innerHTML = [
  1709. '<header>',
  1710. '<a class="close" href="#"><span class="icon"></span></a>',
  1711. '</header>',
  1712. '<div class="viewport">',
  1713. '<div class="viewport-inner">'+ html +'</div>',
  1714. '</div>'
  1715. ].join('');
  1716. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1717. closeOverlay();
  1718. event.preventDefault();
  1719. }, false );
  1720. setTimeout( function() {
  1721. dom.overlay.classList.add( 'visible' );
  1722. }, 1 );
  1723. }
  1724. }
  1725. /**
  1726. * Closes any currently open overlay.
  1727. */
  1728. function closeOverlay() {
  1729. if( dom.overlay ) {
  1730. dom.overlay.parentNode.removeChild( dom.overlay );
  1731. dom.overlay = null;
  1732. }
  1733. }
  1734. /**
  1735. * Applies JavaScript-controlled layout rules to the
  1736. * presentation.
  1737. */
  1738. function layout() {
  1739. if( dom.wrapper && !isPrintingPDF() ) {
  1740. if( !config.disableLayout ) {
  1741. // On some mobile devices '100vh' is taller than the visible
  1742. // viewport which leads to part of the presentation being
  1743. // cut off. To work around this we define our own '--vh' custom
  1744. // property where 100x adds up to the correct height.
  1745. //
  1746. // https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
  1747. if( isMobileDevice ) {
  1748. document.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );
  1749. }
  1750. var size = getComputedSlideSize();
  1751. var oldScale = scale;
  1752. // Layout the contents of the slides
  1753. layoutSlideContents( config.width, config.height );
  1754. dom.slides.style.width = size.width + 'px';
  1755. dom.slides.style.height = size.height + 'px';
  1756. // Determine scale of content to fit within available space
  1757. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1758. // Respect max/min scale settings
  1759. scale = Math.max( scale, config.minScale );
  1760. scale = Math.min( scale, config.maxScale );
  1761. // Don't apply any scaling styles if scale is 1
  1762. if( scale === 1 ) {
  1763. dom.slides.style.zoom = '';
  1764. dom.slides.style.left = '';
  1765. dom.slides.style.top = '';
  1766. dom.slides.style.bottom = '';
  1767. dom.slides.style.right = '';
  1768. transformSlides( { layout: '' } );
  1769. }
  1770. else {
  1771. // Zoom Scaling
  1772. // Content remains crisp no matter how much we scale. Side
  1773. // effects are minor differences in text layout and iframe
  1774. // viewports changing size. A 200x200 iframe viewport in a
  1775. // 2x zoomed presentation ends up having a 400x400 viewport.
  1776. if( scale > 1 && features.zoom && window.devicePixelRatio < 2 ) {
  1777. dom.slides.style.zoom = scale;
  1778. dom.slides.style.left = '';
  1779. dom.slides.style.top = '';
  1780. dom.slides.style.bottom = '';
  1781. dom.slides.style.right = '';
  1782. transformSlides( { layout: '' } );
  1783. }
  1784. // Transform Scaling
  1785. // Content layout remains the exact same when scaled up.
  1786. // Side effect is content becoming blurred, especially with
  1787. // high scale values on ldpi screens.
  1788. else {
  1789. dom.slides.style.zoom = '';
  1790. dom.slides.style.left = '50%';
  1791. dom.slides.style.top = '50%';
  1792. dom.slides.style.bottom = 'auto';
  1793. dom.slides.style.right = 'auto';
  1794. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1795. }
  1796. }
  1797. // Select all slides, vertical and horizontal
  1798. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1799. for( var i = 0, len = slides.length; i < len; i++ ) {
  1800. var slide = slides[ i ];
  1801. // Don't bother updating invisible slides
  1802. if( slide.style.display === 'none' ) {
  1803. continue;
  1804. }
  1805. if( config.center || slide.classList.contains( 'center' ) ) {
  1806. // Vertical stacks are not centred since their section
  1807. // children will be
  1808. if( slide.classList.contains( 'stack' ) ) {
  1809. slide.style.top = 0;
  1810. }
  1811. else {
  1812. slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
  1813. }
  1814. }
  1815. else {
  1816. slide.style.top = '';
  1817. }
  1818. }
  1819. if( oldScale !== scale ) {
  1820. dispatchEvent( 'resize', {
  1821. 'oldScale': oldScale,
  1822. 'scale': scale,
  1823. 'size': size
  1824. } );
  1825. }
  1826. }
  1827. updateProgress();
  1828. updateParallax();
  1829. if( isOverview() ) {
  1830. updateOverview();
  1831. }
  1832. }
  1833. }
  1834. /**
  1835. * Applies layout logic to the contents of all slides in
  1836. * the presentation.
  1837. *
  1838. * @param {string|number} width
  1839. * @param {string|number} height
  1840. */
  1841. function layoutSlideContents( width, height ) {
  1842. // Handle sizing of elements with the 'stretch' class
  1843. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1844. // Determine how much vertical space we can use
  1845. var remainingHeight = getRemainingHeight( element, height );
  1846. // Consider the aspect ratio of media elements
  1847. if( /(img|video)/gi.test( element.nodeName ) ) {
  1848. var nw = element.naturalWidth || element.videoWidth,
  1849. nh = element.naturalHeight || element.videoHeight;
  1850. var es = Math.min( width / nw, remainingHeight / nh );
  1851. element.style.width = ( nw * es ) + 'px';
  1852. element.style.height = ( nh * es ) + 'px';
  1853. }
  1854. else {
  1855. element.style.width = width + 'px';
  1856. element.style.height = remainingHeight + 'px';
  1857. }
  1858. } );
  1859. }
  1860. /**
  1861. * Calculates the computed pixel size of our slides. These
  1862. * values are based on the width and height configuration
  1863. * options.
  1864. *
  1865. * @param {number} [presentationWidth=dom.wrapper.offsetWidth]
  1866. * @param {number} [presentationHeight=dom.wrapper.offsetHeight]
  1867. */
  1868. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1869. var size = {
  1870. // Slide size
  1871. width: config.width,
  1872. height: config.height,
  1873. // Presentation size
  1874. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1875. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1876. };
  1877. // Reduce available space by margin
  1878. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1879. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1880. // Slide width may be a percentage of available width
  1881. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1882. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1883. }
  1884. // Slide height may be a percentage of available height
  1885. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1886. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1887. }
  1888. return size;
  1889. }
  1890. /**
  1891. * Stores the vertical index of a stack so that the same
  1892. * vertical slide can be selected when navigating to and
  1893. * from the stack.
  1894. *
  1895. * @param {HTMLElement} stack The vertical stack element
  1896. * @param {string|number} [v=0] Index to memorize
  1897. */
  1898. function setPreviousVerticalIndex( stack, v ) {
  1899. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1900. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1901. }
  1902. }
  1903. /**
  1904. * Retrieves the vertical index which was stored using
  1905. * #setPreviousVerticalIndex() or 0 if no previous index
  1906. * exists.
  1907. *
  1908. * @param {HTMLElement} stack The vertical stack element
  1909. */
  1910. function getPreviousVerticalIndex( stack ) {
  1911. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1912. // Prefer manually defined start-indexv
  1913. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1914. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1915. }
  1916. return 0;
  1917. }
  1918. /**
  1919. * Displays the overview of slides (quick nav) by scaling
  1920. * down and arranging all slide elements.
  1921. */
  1922. function activateOverview() {
  1923. // Only proceed if enabled in config
  1924. if( config.overview && !isOverview() ) {
  1925. overview = true;
  1926. dom.wrapper.classList.add( 'overview' );
  1927. dom.wrapper.classList.remove( 'overview-deactivating' );
  1928. if( features.overviewTransitions ) {
  1929. setTimeout( function() {
  1930. dom.wrapper.classList.add( 'overview-animated' );
  1931. }, 1 );
  1932. }
  1933. // Don't auto-slide while in overview mode
  1934. cancelAutoSlide();
  1935. // Move the backgrounds element into the slide container to
  1936. // that the same scaling is applied
  1937. dom.slides.appendChild( dom.background );
  1938. // Clicking on an overview slide navigates to it
  1939. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1940. if( !slide.classList.contains( 'stack' ) ) {
  1941. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1942. }
  1943. } );
  1944. // Calculate slide sizes
  1945. var margin = 70;
  1946. var slideSize = getComputedSlideSize();
  1947. overviewSlideWidth = slideSize.width + margin;
  1948. overviewSlideHeight = slideSize.height + margin;
  1949. // Reverse in RTL mode
  1950. if( config.rtl ) {
  1951. overviewSlideWidth = -overviewSlideWidth;
  1952. }
  1953. updateSlidesVisibility();
  1954. layoutOverview();
  1955. updateOverview();
  1956. layout();
  1957. // Notify observers of the overview showing
  1958. dispatchEvent( 'overviewshown', {
  1959. 'indexh': indexh,
  1960. 'indexv': indexv,
  1961. 'currentSlide': currentSlide
  1962. } );
  1963. }
  1964. }
  1965. /**
  1966. * Uses CSS transforms to position all slides in a grid for
  1967. * display inside of the overview mode.
  1968. */
  1969. function layoutOverview() {
  1970. // Layout slides
  1971. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1972. hslide.setAttribute( 'data-index-h', h );
  1973. transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1974. if( hslide.classList.contains( 'stack' ) ) {
  1975. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1976. vslide.setAttribute( 'data-index-h', h );
  1977. vslide.setAttribute( 'data-index-v', v );
  1978. transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1979. } );
  1980. }
  1981. } );
  1982. // Layout slide backgrounds
  1983. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1984. transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1985. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1986. transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1987. } );
  1988. } );
  1989. }
  1990. /**
  1991. * Moves the overview viewport to the current slides.
  1992. * Called each time the current slide changes.
  1993. */
  1994. function updateOverview() {
  1995. var vmin = Math.min( window.innerWidth, window.innerHeight );
  1996. var scale = Math.max( vmin / 5, 150 ) / vmin;
  1997. transformSlides( {
  1998. overview: [
  1999. 'scale('+ scale +')',
  2000. 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
  2001. 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)'
  2002. ].join( ' ' )
  2003. } );
  2004. }
  2005. /**
  2006. * Exits the slide overview and enters the currently
  2007. * active slide.
  2008. */
  2009. function deactivateOverview() {
  2010. // Only proceed if enabled in config
  2011. if( config.overview ) {
  2012. overview = false;
  2013. dom.wrapper.classList.remove( 'overview' );
  2014. dom.wrapper.classList.remove( 'overview-animated' );
  2015. // Temporarily add a class so that transitions can do different things
  2016. // depending on whether they are exiting/entering overview, or just
  2017. // moving from slide to slide
  2018. dom.wrapper.classList.add( 'overview-deactivating' );
  2019. setTimeout( function () {
  2020. dom.wrapper.classList.remove( 'overview-deactivating' );
  2021. }, 1 );
  2022. // Move the background element back out
  2023. dom.wrapper.appendChild( dom.background );
  2024. // Clean up changes made to slides
  2025. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  2026. transformElement( slide, '' );
  2027. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  2028. } );
  2029. // Clean up changes made to backgrounds
  2030. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  2031. transformElement( background, '' );
  2032. } );
  2033. transformSlides( { overview: '' } );
  2034. slide( indexh, indexv );
  2035. layout();
  2036. cueAutoSlide();
  2037. // Notify observers of the overview hiding
  2038. dispatchEvent( 'overviewhidden', {
  2039. 'indexh': indexh,
  2040. 'indexv': indexv,
  2041. 'currentSlide': currentSlide
  2042. } );
  2043. }
  2044. }
  2045. /**
  2046. * Toggles the slide overview mode on and off.
  2047. *
  2048. * @param {Boolean} [override] Flag which overrides the
  2049. * toggle logic and forcibly sets the desired state. True means
  2050. * overview is open, false means it's closed.
  2051. */
  2052. function toggleOverview( override ) {
  2053. if( typeof override === 'boolean' ) {
  2054. override ? activateOverview() : deactivateOverview();
  2055. }
  2056. else {
  2057. isOverview() ? deactivateOverview() : activateOverview();
  2058. }
  2059. }
  2060. /**
  2061. * Checks if the overview is currently active.
  2062. *
  2063. * @return {Boolean} true if the overview is active,
  2064. * false otherwise
  2065. */
  2066. function isOverview() {
  2067. return overview;
  2068. }
  2069. /**
  2070. * Return a hash URL that will resolve to the given slide location.
  2071. *
  2072. * @param {HTMLElement} [slide=currentSlide] The slide to link to
  2073. */
  2074. function locationHash( slide ) {
  2075. var url = '/';
  2076. // Attempt to create a named link based on the slide's ID
  2077. var s = slide || currentSlide;
  2078. var id = s ? s.getAttribute( 'id' ) : null;
  2079. if( id ) {
  2080. id = encodeURIComponent( id );
  2081. }
  2082. var index = getIndices( slide );
  2083. if( !config.fragmentInURL ) {
  2084. index.f = undefined;
  2085. }
  2086. // If the current slide has an ID, use that as a named link,
  2087. // but we don't support named links with a fragment index
  2088. if( typeof id === 'string' && id.length && index.f === undefined ) {
  2089. url = '/' + id;
  2090. }
  2091. // Otherwise use the /h/v index
  2092. else {
  2093. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  2094. if( index.h > 0 || index.v > 0 || index.f !== undefined ) url += index.h + hashIndexBase;
  2095. if( index.v > 0 || index.f !== undefined ) url += '/' + (index.v + hashIndexBase );
  2096. if( index.f !== undefined ) url += '/' + index.f;
  2097. }
  2098. return url;
  2099. }
  2100. /**
  2101. * Checks if the current or specified slide is vertical
  2102. * (nested within another slide).
  2103. *
  2104. * @param {HTMLElement} [slide=currentSlide] The slide to check
  2105. * orientation of
  2106. * @return {Boolean}
  2107. */
  2108. function isVerticalSlide( slide ) {
  2109. // Prefer slide argument, otherwise use current slide
  2110. slide = slide ? slide : currentSlide;
  2111. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  2112. }
  2113. /**
  2114. * Handling the fullscreen functionality via the fullscreen API
  2115. *
  2116. * @see http://fullscreen.spec.whatwg.org/
  2117. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  2118. */
  2119. function enterFullscreen() {
  2120. var element = document.documentElement;
  2121. // Check which implementation is available
  2122. var requestMethod = element.requestFullscreen ||
  2123. element.webkitRequestFullscreen ||
  2124. element.webkitRequestFullScreen ||
  2125. element.mozRequestFullScreen ||
  2126. element.msRequestFullscreen;
  2127. if( requestMethod ) {
  2128. requestMethod.apply( element );
  2129. }
  2130. }
  2131. /**
  2132. * Shows the mouse pointer after it has been hidden with
  2133. * #hideCursor.
  2134. */
  2135. function showCursor() {
  2136. if( cursorHidden ) {
  2137. cursorHidden = false;
  2138. dom.wrapper.style.cursor = '';
  2139. }
  2140. }
  2141. /**
  2142. * Hides the mouse pointer when it's on top of the .reveal
  2143. * container.
  2144. */
  2145. function hideCursor() {
  2146. if( cursorHidden === false ) {
  2147. cursorHidden = true;
  2148. dom.wrapper.style.cursor = 'none';
  2149. }
  2150. }
  2151. /**
  2152. * Enters the paused mode which fades everything on screen to
  2153. * black.
  2154. */
  2155. function pause() {
  2156. if( config.pause ) {
  2157. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2158. cancelAutoSlide();
  2159. dom.wrapper.classList.add( 'paused' );
  2160. if( wasPaused === false ) {
  2161. dispatchEvent( 'paused' );
  2162. }
  2163. }
  2164. }
  2165. /**
  2166. * Exits from the paused mode.
  2167. */
  2168. function resume() {
  2169. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2170. dom.wrapper.classList.remove( 'paused' );
  2171. cueAutoSlide();
  2172. if( wasPaused ) {
  2173. dispatchEvent( 'resumed' );
  2174. }
  2175. }
  2176. /**
  2177. * Toggles the paused mode on and off.
  2178. */
  2179. function togglePause( override ) {
  2180. if( typeof override === 'boolean' ) {
  2181. override ? pause() : resume();
  2182. }
  2183. else {
  2184. isPaused() ? resume() : pause();
  2185. }
  2186. }
  2187. /**
  2188. * Checks if we are currently in the paused mode.
  2189. *
  2190. * @return {Boolean}
  2191. */
  2192. function isPaused() {
  2193. return dom.wrapper.classList.contains( 'paused' );
  2194. }
  2195. /**
  2196. * Toggles the auto slide mode on and off.
  2197. *
  2198. * @param {Boolean} [override] Flag which sets the desired state.
  2199. * True means autoplay starts, false means it stops.
  2200. */
  2201. function toggleAutoSlide( override ) {
  2202. if( typeof override === 'boolean' ) {
  2203. override ? resumeAutoSlide() : pauseAutoSlide();
  2204. }
  2205. else {
  2206. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  2207. }
  2208. }
  2209. /**
  2210. * Checks if the auto slide mode is currently on.
  2211. *
  2212. * @return {Boolean}
  2213. */
  2214. function isAutoSliding() {
  2215. return !!( autoSlide && !autoSlidePaused );
  2216. }
  2217. /**
  2218. * Steps from the current point in the presentation to the
  2219. * slide which matches the specified horizontal and vertical
  2220. * indices.
  2221. *
  2222. * @param {number} [h=indexh] Horizontal index of the target slide
  2223. * @param {number} [v=indexv] Vertical index of the target slide
  2224. * @param {number} [f] Index of a fragment within the
  2225. * target slide to activate
  2226. * @param {number} [o] Origin for use in multimaster environments
  2227. */
  2228. function slide( h, v, f, o ) {
  2229. // Remember where we were at before
  2230. previousSlide = currentSlide;
  2231. // Query all horizontal slides in the deck
  2232. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  2233. // Abort if there are no slides
  2234. if( horizontalSlides.length === 0 ) return;
  2235. // If no vertical index is specified and the upcoming slide is a
  2236. // stack, resume at its previous vertical index
  2237. if( v === undefined && !isOverview() ) {
  2238. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  2239. }
  2240. // If we were on a vertical stack, remember what vertical index
  2241. // it was on so we can resume at the same position when returning
  2242. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  2243. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  2244. }
  2245. // Remember the state before this slide
  2246. var stateBefore = state.concat();
  2247. // Reset the state array
  2248. state.length = 0;
  2249. var indexhBefore = indexh || 0,
  2250. indexvBefore = indexv || 0;
  2251. // Activate and transition to the new slide
  2252. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  2253. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  2254. // Update the visibility of slides now that the indices have changed
  2255. updateSlidesVisibility();
  2256. layout();
  2257. // Update the overview if it's currently active
  2258. if( isOverview() ) {
  2259. updateOverview();
  2260. }
  2261. // Find the current horizontal slide and any possible vertical slides
  2262. // within it
  2263. var currentHorizontalSlide = horizontalSlides[ indexh ],
  2264. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  2265. // Store references to the previous and current slides
  2266. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  2267. // Show fragment, if specified
  2268. if( typeof f !== 'undefined' ) {
  2269. navigateFragment( f );
  2270. }
  2271. // Dispatch an event if the slide changed
  2272. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  2273. if (!slideChanged) {
  2274. // Ensure that the previous slide is never the same as the current
  2275. previousSlide = null;
  2276. }
  2277. // Solves an edge case where the previous slide maintains the
  2278. // 'present' class when navigating between adjacent vertical
  2279. // stacks
  2280. if( previousSlide && previousSlide !== currentSlide ) {
  2281. previousSlide.classList.remove( 'present' );
  2282. previousSlide.setAttribute( 'aria-hidden', 'true' );
  2283. // Reset all slides upon navigate to home
  2284. // Issue: #285
  2285. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  2286. // Launch async task
  2287. setTimeout( function () {
  2288. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  2289. for( i in slides ) {
  2290. if( slides[i] ) {
  2291. // Reset stack
  2292. setPreviousVerticalIndex( slides[i], 0 );
  2293. }
  2294. }
  2295. }, 0 );
  2296. }
  2297. }
  2298. // Apply the new state
  2299. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  2300. // Check if this state existed on the previous slide. If it
  2301. // did, we will avoid adding it repeatedly
  2302. for( var j = 0; j < stateBefore.length; j++ ) {
  2303. if( stateBefore[j] === state[i] ) {
  2304. stateBefore.splice( j, 1 );
  2305. continue stateLoop;
  2306. }
  2307. }
  2308. document.documentElement.classList.add( state[i] );
  2309. // Dispatch custom event matching the state's name
  2310. dispatchEvent( state[i] );
  2311. }
  2312. // Clean up the remains of the previous state
  2313. while( stateBefore.length ) {
  2314. document.documentElement.classList.remove( stateBefore.pop() );
  2315. }
  2316. if( slideChanged ) {
  2317. dispatchEvent( 'slidechanged', {
  2318. 'indexh': indexh,
  2319. 'indexv': indexv,
  2320. 'previousSlide': previousSlide,
  2321. 'currentSlide': currentSlide,
  2322. 'origin': o
  2323. } );
  2324. }
  2325. // Handle embedded content
  2326. if( slideChanged || !previousSlide ) {
  2327. stopEmbeddedContent( previousSlide );
  2328. startEmbeddedContent( currentSlide );
  2329. }
  2330. // Announce the current slide contents, for screen readers
  2331. dom.statusDiv.textContent = getStatusText( currentSlide );
  2332. updateControls();
  2333. updateProgress();
  2334. updateBackground();
  2335. updateParallax();
  2336. updateSlideNumber();
  2337. updateNotes();
  2338. updateFragments();
  2339. // Update the URL hash
  2340. writeURL();
  2341. cueAutoSlide();
  2342. }
  2343. /**
  2344. * Syncs the presentation with the current DOM. Useful
  2345. * when new slides or control elements are added or when
  2346. * the configuration has changed.
  2347. */
  2348. function sync() {
  2349. // Subscribe to input
  2350. removeEventListeners();
  2351. addEventListeners();
  2352. // Force a layout to make sure the current config is accounted for
  2353. layout();
  2354. // Reflect the current autoSlide value
  2355. autoSlide = config.autoSlide;
  2356. // Start auto-sliding if it's enabled
  2357. cueAutoSlide();
  2358. // Re-create the slide backgrounds
  2359. createBackgrounds();
  2360. // Write the current hash to the URL
  2361. writeURL();
  2362. sortAllFragments();
  2363. updateControls();
  2364. updateProgress();
  2365. updateSlideNumber();
  2366. updateSlidesVisibility();
  2367. updateBackground( true );
  2368. updateNotesVisibility();
  2369. updateNotes();
  2370. formatEmbeddedContent();
  2371. // Start or stop embedded content depending on global config
  2372. if( config.autoPlayMedia === false ) {
  2373. stopEmbeddedContent( currentSlide, { unloadIframes: false } );
  2374. }
  2375. else {
  2376. startEmbeddedContent( currentSlide );
  2377. }
  2378. if( isOverview() ) {
  2379. layoutOverview();
  2380. }
  2381. }
  2382. /**
  2383. * Updates reveal.js to keep in sync with new slide attributes. For
  2384. * example, if you add a new `data-background-image` you can call
  2385. * this to have reveal.js render the new background image.
  2386. *
  2387. * Similar to #sync() but more efficient when you only need to
  2388. * refresh a specific slide.
  2389. *
  2390. * @param {HTMLElement} slide
  2391. */
  2392. function syncSlide( slide ) {
  2393. // Default to the current slide
  2394. slide = slide || currentSlide;
  2395. syncBackground( slide );
  2396. syncFragments( slide );
  2397. loadSlide( slide );
  2398. updateBackground();
  2399. updateNotes();
  2400. }
  2401. /**
  2402. * Formats the fragments on the given slide so that they have
  2403. * valid indices. Call this if fragments are changed in the DOM
  2404. * after reveal.js has already initialized.
  2405. *
  2406. * @param {HTMLElement} slide
  2407. * @return {Array} a list of the HTML fragments that were synced
  2408. */
  2409. function syncFragments( slide ) {
  2410. // Default to the current slide
  2411. slide = slide || currentSlide;
  2412. return sortFragments( slide.querySelectorAll( '.fragment' ) );
  2413. }
  2414. /**
  2415. * Resets all vertical slides so that only the first
  2416. * is visible.
  2417. */
  2418. function resetVerticalSlides() {
  2419. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2420. horizontalSlides.forEach( function( horizontalSlide ) {
  2421. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2422. verticalSlides.forEach( function( verticalSlide, y ) {
  2423. if( y > 0 ) {
  2424. verticalSlide.classList.remove( 'present' );
  2425. verticalSlide.classList.remove( 'past' );
  2426. verticalSlide.classList.add( 'future' );
  2427. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  2428. }
  2429. } );
  2430. } );
  2431. }
  2432. /**
  2433. * Sorts and formats all of fragments in the
  2434. * presentation.
  2435. */
  2436. function sortAllFragments() {
  2437. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2438. horizontalSlides.forEach( function( horizontalSlide ) {
  2439. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2440. verticalSlides.forEach( function( verticalSlide, y ) {
  2441. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  2442. } );
  2443. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  2444. } );
  2445. }
  2446. /**
  2447. * Randomly shuffles all slides in the deck.
  2448. */
  2449. function shuffle() {
  2450. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2451. slides.forEach( function( slide ) {
  2452. // Insert this slide next to another random slide. This may
  2453. // cause the slide to insert before itself but that's fine.
  2454. dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
  2455. } );
  2456. }
  2457. /**
  2458. * Updates one dimension of slides by showing the slide
  2459. * with the specified index.
  2460. *
  2461. * @param {string} selector A CSS selector that will fetch
  2462. * the group of slides we are working with
  2463. * @param {number} index The index of the slide that should be
  2464. * shown
  2465. *
  2466. * @return {number} The index of the slide that is now shown,
  2467. * might differ from the passed in index if it was out of
  2468. * bounds.
  2469. */
  2470. function updateSlides( selector, index ) {
  2471. // Select all slides and convert the NodeList result to
  2472. // an array
  2473. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  2474. slidesLength = slides.length;
  2475. var printMode = isPrintingPDF();
  2476. if( slidesLength ) {
  2477. // Should the index loop?
  2478. if( config.loop ) {
  2479. index %= slidesLength;
  2480. if( index < 0 ) {
  2481. index = slidesLength + index;
  2482. }
  2483. }
  2484. // Enforce max and minimum index bounds
  2485. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  2486. for( var i = 0; i < slidesLength; i++ ) {
  2487. var element = slides[i];
  2488. var reverse = config.rtl && !isVerticalSlide( element );
  2489. element.classList.remove( 'past' );
  2490. element.classList.remove( 'present' );
  2491. element.classList.remove( 'future' );
  2492. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  2493. element.setAttribute( 'hidden', '' );
  2494. element.setAttribute( 'aria-hidden', 'true' );
  2495. // If this element contains vertical slides
  2496. if( element.querySelector( 'section' ) ) {
  2497. element.classList.add( 'stack' );
  2498. }
  2499. // If we're printing static slides, all slides are "present"
  2500. if( printMode ) {
  2501. element.classList.add( 'present' );
  2502. continue;
  2503. }
  2504. if( i < index ) {
  2505. // Any element previous to index is given the 'past' class
  2506. element.classList.add( reverse ? 'future' : 'past' );
  2507. if( config.fragments ) {
  2508. // Show all fragments in prior slides
  2509. toArray( element.querySelectorAll( '.fragment' ) ).forEach( function( fragment ) {
  2510. fragment.classList.add( 'visible' );
  2511. fragment.classList.remove( 'current-fragment' );
  2512. } );
  2513. }
  2514. }
  2515. else if( i > index ) {
  2516. // Any element subsequent to index is given the 'future' class
  2517. element.classList.add( reverse ? 'past' : 'future' );
  2518. if( config.fragments ) {
  2519. // Hide all fragments in future slides
  2520. toArray( element.querySelectorAll( '.fragment.visible' ) ).forEach( function( fragment ) {
  2521. fragment.classList.remove( 'visible' );
  2522. fragment.classList.remove( 'current-fragment' );
  2523. } );
  2524. }
  2525. }
  2526. }
  2527. // Mark the current slide as present
  2528. slides[index].classList.add( 'present' );
  2529. slides[index].removeAttribute( 'hidden' );
  2530. slides[index].removeAttribute( 'aria-hidden' );
  2531. // If this slide has a state associated with it, add it
  2532. // onto the current state of the deck
  2533. var slideState = slides[index].getAttribute( 'data-state' );
  2534. if( slideState ) {
  2535. state = state.concat( slideState.split( ' ' ) );
  2536. }
  2537. }
  2538. else {
  2539. // Since there are no slides we can't be anywhere beyond the
  2540. // zeroth index
  2541. index = 0;
  2542. }
  2543. return index;
  2544. }
  2545. /**
  2546. * Optimization method; hide all slides that are far away
  2547. * from the present slide.
  2548. */
  2549. function updateSlidesVisibility() {
  2550. // Select all slides and convert the NodeList result to
  2551. // an array
  2552. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  2553. horizontalSlidesLength = horizontalSlides.length,
  2554. distanceX,
  2555. distanceY;
  2556. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  2557. // The number of steps away from the present slide that will
  2558. // be visible
  2559. var viewDistance = isOverview() ? 10 : config.viewDistance;
  2560. // Limit view distance on weaker devices
  2561. if( isMobileDevice ) {
  2562. viewDistance = isOverview() ? 6 : 2;
  2563. }
  2564. // All slides need to be visible when exporting to PDF
  2565. if( isPrintingPDF() ) {
  2566. viewDistance = Number.MAX_VALUE;
  2567. }
  2568. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  2569. var horizontalSlide = horizontalSlides[x];
  2570. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  2571. verticalSlidesLength = verticalSlides.length;
  2572. // Determine how far away this slide is from the present
  2573. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  2574. // If the presentation is looped, distance should measure
  2575. // 1 between the first and last slides
  2576. if( config.loop ) {
  2577. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  2578. }
  2579. // Show the horizontal slide if it's within the view distance
  2580. if( distanceX < viewDistance ) {
  2581. loadSlide( horizontalSlide );
  2582. }
  2583. else {
  2584. unloadSlide( horizontalSlide );
  2585. }
  2586. if( verticalSlidesLength ) {
  2587. var oy = getPreviousVerticalIndex( horizontalSlide );
  2588. for( var y = 0; y < verticalSlidesLength; y++ ) {
  2589. var verticalSlide = verticalSlides[y];
  2590. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  2591. if( distanceX + distanceY < viewDistance ) {
  2592. loadSlide( verticalSlide );
  2593. }
  2594. else {
  2595. unloadSlide( verticalSlide );
  2596. }
  2597. }
  2598. }
  2599. }
  2600. // Flag if there are ANY vertical slides, anywhere in the deck
  2601. if( hasVerticalSlides() ) {
  2602. dom.wrapper.classList.add( 'has-vertical-slides' );
  2603. }
  2604. else {
  2605. dom.wrapper.classList.remove( 'has-vertical-slides' );
  2606. }
  2607. // Flag if there are ANY horizontal slides, anywhere in the deck
  2608. if( hasHorizontalSlides() ) {
  2609. dom.wrapper.classList.add( 'has-horizontal-slides' );
  2610. }
  2611. else {
  2612. dom.wrapper.classList.remove( 'has-horizontal-slides' );
  2613. }
  2614. }
  2615. }
  2616. /**
  2617. * Pick up notes from the current slide and display them
  2618. * to the viewer.
  2619. *
  2620. * @see {@link config.showNotes}
  2621. */
  2622. function updateNotes() {
  2623. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  2624. dom.speakerNotes.innerHTML = getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
  2625. }
  2626. }
  2627. /**
  2628. * Updates the visibility of the speaker notes sidebar that
  2629. * is used to share annotated slides. The notes sidebar is
  2630. * only visible if showNotes is true and there are notes on
  2631. * one or more slides in the deck.
  2632. */
  2633. function updateNotesVisibility() {
  2634. if( config.showNotes && hasNotes() ) {
  2635. dom.wrapper.classList.add( 'show-notes' );
  2636. }
  2637. else {
  2638. dom.wrapper.classList.remove( 'show-notes' );
  2639. }
  2640. }
  2641. /**
  2642. * Checks if there are speaker notes for ANY slide in the
  2643. * presentation.
  2644. */
  2645. function hasNotes() {
  2646. return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0;
  2647. }
  2648. /**
  2649. * Updates the progress bar to reflect the current slide.
  2650. */
  2651. function updateProgress() {
  2652. // Update progress if enabled
  2653. if( config.progress && dom.progressbar ) {
  2654. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  2655. }
  2656. }
  2657. /**
  2658. * Updates the slide number to match the current slide.
  2659. */
  2660. function updateSlideNumber() {
  2661. // Update slide number if enabled
  2662. if( config.slideNumber && dom.slideNumber ) {
  2663. var value;
  2664. var format = 'h.v';
  2665. if( typeof config.slideNumber === 'function' ) {
  2666. value = config.slideNumber();
  2667. }
  2668. else {
  2669. // Check if a custom number format is available
  2670. if( typeof config.slideNumber === 'string' ) {
  2671. format = config.slideNumber;
  2672. }
  2673. // If there are ONLY vertical slides in this deck, always use
  2674. // a flattened slide number
  2675. if( !/c/.test( format ) && dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length === 1 ) {
  2676. format = 'c';
  2677. }
  2678. value = [];
  2679. switch( format ) {
  2680. case 'c':
  2681. value.push( getSlidePastCount() + 1 );
  2682. break;
  2683. case 'c/t':
  2684. value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
  2685. break;
  2686. case 'h/v':
  2687. value.push( indexh + 1 );
  2688. if( isVerticalSlide() ) value.push( '/', indexv + 1 );
  2689. break;
  2690. default:
  2691. value.push( indexh + 1 );
  2692. if( isVerticalSlide() ) value.push( '.', indexv + 1 );
  2693. }
  2694. }
  2695. dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
  2696. }
  2697. }
  2698. /**
  2699. * Applies HTML formatting to a slide number before it's
  2700. * written to the DOM.
  2701. *
  2702. * @param {number} a Current slide
  2703. * @param {string} delimiter Character to separate slide numbers
  2704. * @param {(number|*)} b Total slides
  2705. * @return {string} HTML string fragment
  2706. */
  2707. function formatSlideNumber( a, delimiter, b ) {
  2708. var url = '#' + locationHash();
  2709. if( typeof b === 'number' && !isNaN( b ) ) {
  2710. return '<a href="' + url + '">' +
  2711. '<span class="slide-number-a">'+ a +'</span>' +
  2712. '<span class="slide-number-delimiter">'+ delimiter +'</span>' +
  2713. '<span class="slide-number-b">'+ b +'</span>' +
  2714. '</a>';
  2715. }
  2716. else {
  2717. return '<a href="' + url + '">' +
  2718. '<span class="slide-number-a">'+ a +'</span>' +
  2719. '</a>';
  2720. }
  2721. }
  2722. /**
  2723. * Updates the state of all control/navigation arrows.
  2724. */
  2725. function updateControls() {
  2726. var routes = availableRoutes();
  2727. var fragments = availableFragments();
  2728. // Remove the 'enabled' class from all directions
  2729. dom.controlsLeft.concat( dom.controlsRight )
  2730. .concat( dom.controlsUp )
  2731. .concat( dom.controlsDown )
  2732. .concat( dom.controlsPrev )
  2733. .concat( dom.controlsNext ).forEach( function( node ) {
  2734. node.classList.remove( 'enabled' );
  2735. node.classList.remove( 'fragmented' );
  2736. // Set 'disabled' attribute on all directions
  2737. node.setAttribute( 'disabled', 'disabled' );
  2738. } );
  2739. // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
  2740. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2741. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2742. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2743. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2744. // Prev/next buttons
  2745. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2746. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2747. // Highlight fragment directions
  2748. if( currentSlide ) {
  2749. // Always apply fragment decorator to prev/next buttons
  2750. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2751. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2752. // Apply fragment decorators to directional buttons based on
  2753. // what slide axis they are in
  2754. if( isVerticalSlide( currentSlide ) ) {
  2755. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2756. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2757. }
  2758. else {
  2759. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2760. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2761. }
  2762. }
  2763. if( config.controlsTutorial ) {
  2764. // Highlight control arrows with an animation to ensure
  2765. // that the viewer knows how to navigate
  2766. if( !hasNavigatedDown && routes.down ) {
  2767. dom.controlsDownArrow.classList.add( 'highlight' );
  2768. }
  2769. else {
  2770. dom.controlsDownArrow.classList.remove( 'highlight' );
  2771. if( !hasNavigatedRight && routes.right && indexv === 0 ) {
  2772. dom.controlsRightArrow.classList.add( 'highlight' );
  2773. }
  2774. else {
  2775. dom.controlsRightArrow.classList.remove( 'highlight' );
  2776. }
  2777. }
  2778. }
  2779. }
  2780. /**
  2781. * Updates the background elements to reflect the current
  2782. * slide.
  2783. *
  2784. * @param {boolean} includeAll If true, the backgrounds of
  2785. * all vertical slides (not just the present) will be updated.
  2786. */
  2787. function updateBackground( includeAll ) {
  2788. var currentBackground = null;
  2789. // Reverse past/future classes when in RTL mode
  2790. var horizontalPast = config.rtl ? 'future' : 'past',
  2791. horizontalFuture = config.rtl ? 'past' : 'future';
  2792. // Update the classes of all backgrounds to match the
  2793. // states of their slides (past/present/future)
  2794. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2795. backgroundh.classList.remove( 'past' );
  2796. backgroundh.classList.remove( 'present' );
  2797. backgroundh.classList.remove( 'future' );
  2798. if( h < indexh ) {
  2799. backgroundh.classList.add( horizontalPast );
  2800. }
  2801. else if ( h > indexh ) {
  2802. backgroundh.classList.add( horizontalFuture );
  2803. }
  2804. else {
  2805. backgroundh.classList.add( 'present' );
  2806. // Store a reference to the current background element
  2807. currentBackground = backgroundh;
  2808. }
  2809. if( includeAll || h === indexh ) {
  2810. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2811. backgroundv.classList.remove( 'past' );
  2812. backgroundv.classList.remove( 'present' );
  2813. backgroundv.classList.remove( 'future' );
  2814. if( v < indexv ) {
  2815. backgroundv.classList.add( 'past' );
  2816. }
  2817. else if ( v > indexv ) {
  2818. backgroundv.classList.add( 'future' );
  2819. }
  2820. else {
  2821. backgroundv.classList.add( 'present' );
  2822. // Only if this is the present horizontal and vertical slide
  2823. if( h === indexh ) currentBackground = backgroundv;
  2824. }
  2825. } );
  2826. }
  2827. } );
  2828. // Stop content inside of previous backgrounds
  2829. if( previousBackground ) {
  2830. stopEmbeddedContent( previousBackground, { unloadIframes: !shouldPreload( previousBackground ) } );
  2831. }
  2832. // Start content in the current background
  2833. if( currentBackground ) {
  2834. startEmbeddedContent( currentBackground );
  2835. var currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
  2836. if( currentBackgroundContent ) {
  2837. var backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';
  2838. // Restart GIFs (doesn't work in Firefox)
  2839. if( /\.gif/i.test( backgroundImageURL ) ) {
  2840. currentBackgroundContent.style.backgroundImage = '';
  2841. window.getComputedStyle( currentBackgroundContent ).opacity;
  2842. currentBackgroundContent.style.backgroundImage = backgroundImageURL;
  2843. }
  2844. }
  2845. // Don't transition between identical backgrounds. This
  2846. // prevents unwanted flicker.
  2847. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2848. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2849. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2850. dom.background.classList.add( 'no-transition' );
  2851. }
  2852. previousBackground = currentBackground;
  2853. }
  2854. // If there's a background brightness flag for this slide,
  2855. // bubble it to the .reveal container
  2856. if( currentSlide ) {
  2857. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2858. if( currentSlide.classList.contains( classToBubble ) ) {
  2859. dom.wrapper.classList.add( classToBubble );
  2860. }
  2861. else {
  2862. dom.wrapper.classList.remove( classToBubble );
  2863. }
  2864. } );
  2865. }
  2866. // Allow the first background to apply without transition
  2867. setTimeout( function() {
  2868. dom.background.classList.remove( 'no-transition' );
  2869. }, 1 );
  2870. }
  2871. /**
  2872. * Updates the position of the parallax background based
  2873. * on the current slide index.
  2874. */
  2875. function updateParallax() {
  2876. if( config.parallaxBackgroundImage ) {
  2877. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2878. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2879. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2880. backgroundWidth, backgroundHeight;
  2881. if( backgroundSize.length === 1 ) {
  2882. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2883. }
  2884. else {
  2885. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2886. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2887. }
  2888. var slideWidth = dom.background.offsetWidth,
  2889. horizontalSlideCount = horizontalSlides.length,
  2890. horizontalOffsetMultiplier,
  2891. horizontalOffset;
  2892. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2893. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2894. }
  2895. else {
  2896. horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
  2897. }
  2898. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2899. var slideHeight = dom.background.offsetHeight,
  2900. verticalSlideCount = verticalSlides.length,
  2901. verticalOffsetMultiplier,
  2902. verticalOffset;
  2903. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2904. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2905. }
  2906. else {
  2907. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2908. }
  2909. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0;
  2910. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2911. }
  2912. }
  2913. /**
  2914. * Should the given element be preloaded?
  2915. * Decides based on local element attributes and global config.
  2916. *
  2917. * @param {HTMLElement} element
  2918. */
  2919. function shouldPreload( element ) {
  2920. // Prefer an explicit global preload setting
  2921. var preload = config.preloadIframes;
  2922. // If no global setting is available, fall back on the element's
  2923. // own preload setting
  2924. if( typeof preload !== 'boolean' ) {
  2925. preload = element.hasAttribute( 'data-preload' );
  2926. }
  2927. return preload;
  2928. }
  2929. /**
  2930. * Called when the given slide is within the configured view
  2931. * distance. Shows the slide element and loads any content
  2932. * that is set to load lazily (data-src).
  2933. *
  2934. * @param {HTMLElement} slide Slide to show
  2935. */
  2936. function loadSlide( slide, options ) {
  2937. options = options || {};
  2938. // Show the slide element
  2939. slide.style.display = config.display;
  2940. // Media elements with data-src attributes
  2941. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  2942. if( element.tagName !== 'IFRAME' || shouldPreload( element ) ) {
  2943. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2944. element.setAttribute( 'data-lazy-loaded', '' );
  2945. element.removeAttribute( 'data-src' );
  2946. }
  2947. } );
  2948. // Media elements with <source> children
  2949. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2950. var sources = 0;
  2951. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2952. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2953. source.removeAttribute( 'data-src' );
  2954. source.setAttribute( 'data-lazy-loaded', '' );
  2955. sources += 1;
  2956. } );
  2957. // If we rewrote sources for this video/audio element, we need
  2958. // to manually tell it to load from its new origin
  2959. if( sources > 0 ) {
  2960. media.load();
  2961. }
  2962. } );
  2963. // Show the corresponding background element
  2964. var background = slide.slideBackgroundElement;
  2965. if( background ) {
  2966. background.style.display = 'block';
  2967. var backgroundContent = slide.slideBackgroundContentElement;
  2968. var backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2969. // If the background contains media, load it
  2970. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2971. background.setAttribute( 'data-loaded', 'true' );
  2972. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2973. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2974. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2975. backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' );
  2976. // Images
  2977. if( backgroundImage ) {
  2978. backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')';
  2979. }
  2980. // Videos
  2981. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2982. var video = document.createElement( 'video' );
  2983. if( backgroundVideoLoop ) {
  2984. video.setAttribute( 'loop', '' );
  2985. }
  2986. if( backgroundVideoMuted ) {
  2987. video.muted = true;
  2988. }
  2989. // Inline video playback works (at least in Mobile Safari) as
  2990. // long as the video is muted and the `playsinline` attribute is
  2991. // present
  2992. if( isMobileDevice ) {
  2993. video.muted = true;
  2994. video.autoplay = true;
  2995. video.setAttribute( 'playsinline', '' );
  2996. }
  2997. // Support comma separated lists of video sources
  2998. backgroundVideo.split( ',' ).forEach( function( source ) {
  2999. video.innerHTML += '<source src="'+ source +'">';
  3000. } );
  3001. backgroundContent.appendChild( video );
  3002. }
  3003. // Iframes
  3004. else if( backgroundIframe && options.excludeIframes !== true ) {
  3005. var iframe = document.createElement( 'iframe' );
  3006. iframe.setAttribute( 'allowfullscreen', '' );
  3007. iframe.setAttribute( 'mozallowfullscreen', '' );
  3008. iframe.setAttribute( 'webkitallowfullscreen', '' );
  3009. iframe.setAttribute( 'data-src', backgroundIframe );
  3010. iframe.style.width = '100%';
  3011. iframe.style.height = '100%';
  3012. iframe.style.maxHeight = '100%';
  3013. iframe.style.maxWidth = '100%';
  3014. backgroundContent.appendChild( iframe );
  3015. }
  3016. }
  3017. // Start loading preloadable iframes
  3018. var backgroundIframeElement = backgroundContent.querySelector( 'iframe[data-src]' );
  3019. if( backgroundIframeElement ) {
  3020. // Check if this iframe is eligible to be preloaded
  3021. if( shouldPreload( background ) && !/autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
  3022. if( backgroundIframeElement.getAttribute( 'src' ) !== backgroundIframe ) {
  3023. backgroundIframeElement.setAttribute( 'src', backgroundIframe );
  3024. }
  3025. }
  3026. }
  3027. }
  3028. }
  3029. /**
  3030. * Unloads and hides the given slide. This is called when the
  3031. * slide is moved outside of the configured view distance.
  3032. *
  3033. * @param {HTMLElement} slide
  3034. */
  3035. function unloadSlide( slide ) {
  3036. // Hide the slide element
  3037. slide.style.display = 'none';
  3038. // Hide the corresponding background element
  3039. var background = getSlideBackground( slide );
  3040. if( background ) {
  3041. background.style.display = 'none';
  3042. // Unload any background iframes
  3043. toArray( background.querySelectorAll( 'iframe[src]' ) ).forEach( function( element ) {
  3044. element.removeAttribute( 'src' );
  3045. } );
  3046. }
  3047. // Reset lazy-loaded media elements with src attributes
  3048. toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ) ).forEach( function( element ) {
  3049. element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
  3050. element.removeAttribute( 'src' );
  3051. } );
  3052. // Reset lazy-loaded media elements with <source> children
  3053. toArray( slide.querySelectorAll( 'video[data-lazy-loaded] source[src], audio source[src]' ) ).forEach( function( source ) {
  3054. source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
  3055. source.removeAttribute( 'src' );
  3056. } );
  3057. }
  3058. /**
  3059. * Determine what available routes there are for navigation.
  3060. *
  3061. * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
  3062. */
  3063. function availableRoutes() {
  3064. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  3065. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  3066. var routes = {
  3067. left: indexh > 0,
  3068. right: indexh < horizontalSlides.length - 1,
  3069. up: indexv > 0,
  3070. down: indexv < verticalSlides.length - 1
  3071. };
  3072. // Looped presentations can always be navigated as long as
  3073. // there are slides available
  3074. if( config.loop ) {
  3075. if( horizontalSlides.length > 1 ) {
  3076. routes.left = true;
  3077. routes.right = true;
  3078. }
  3079. if( verticalSlides.length > 1 ) {
  3080. routes.up = true;
  3081. routes.down = true;
  3082. }
  3083. }
  3084. // Reverse horizontal controls for rtl
  3085. if( config.rtl ) {
  3086. var left = routes.left;
  3087. routes.left = routes.right;
  3088. routes.right = left;
  3089. }
  3090. return routes;
  3091. }
  3092. /**
  3093. * Returns an object describing the available fragment
  3094. * directions.
  3095. *
  3096. * @return {{prev: boolean, next: boolean}}
  3097. */
  3098. function availableFragments() {
  3099. if( currentSlide && config.fragments ) {
  3100. var fragments = currentSlide.querySelectorAll( '.fragment' );
  3101. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  3102. return {
  3103. prev: fragments.length - hiddenFragments.length > 0,
  3104. next: !!hiddenFragments.length
  3105. };
  3106. }
  3107. else {
  3108. return { prev: false, next: false };
  3109. }
  3110. }
  3111. /**
  3112. * Enforces origin-specific format rules for embedded media.
  3113. */
  3114. function formatEmbeddedContent() {
  3115. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  3116. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  3117. var src = el.getAttribute( sourceAttribute );
  3118. if( src && src.indexOf( param ) === -1 ) {
  3119. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  3120. }
  3121. });
  3122. };
  3123. // YouTube frames must include "?enablejsapi=1"
  3124. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  3125. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  3126. // Vimeo frames must include "?api=1"
  3127. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  3128. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  3129. }
  3130. /**
  3131. * Start playback of any embedded content inside of
  3132. * the given element.
  3133. *
  3134. * @param {HTMLElement} element
  3135. */
  3136. function startEmbeddedContent( element ) {
  3137. if( element && !isSpeakerNotes() ) {
  3138. // Restart GIFs
  3139. toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  3140. // Setting the same unchanged source like this was confirmed
  3141. // to work in Chrome, FF & Safari
  3142. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  3143. } );
  3144. // HTML5 media elements
  3145. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3146. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3147. return;
  3148. }
  3149. // Prefer an explicit global autoplay setting
  3150. var autoplay = config.autoPlayMedia;
  3151. // If no global setting is available, fall back on the element's
  3152. // own autoplay setting
  3153. if( typeof autoplay !== 'boolean' ) {
  3154. autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
  3155. }
  3156. if( autoplay && typeof el.play === 'function' ) {
  3157. // If the media is ready, start playback
  3158. if( el.readyState > 1 ) {
  3159. startEmbeddedMedia( { target: el } );
  3160. }
  3161. // Mobile devices never fire a loaded event so instead
  3162. // of waiting, we initiate playback
  3163. else if( isMobileDevice ) {
  3164. var promise = el.play();
  3165. // If autoplay does not work, ensure that the controls are visible so
  3166. // that the viewer can start the media on their own
  3167. if( promise && typeof promise.catch === 'function' && el.controls === false ) {
  3168. promise.catch( function() {
  3169. el.controls = true;
  3170. // Once the video does start playing, hide the controls again
  3171. el.addEventListener( 'play', function() {
  3172. el.controls = false;
  3173. } );
  3174. } );
  3175. }
  3176. }
  3177. // If the media isn't loaded, wait before playing
  3178. else {
  3179. el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes
  3180. el.addEventListener( 'loadeddata', startEmbeddedMedia );
  3181. }
  3182. }
  3183. } );
  3184. // Normal iframes
  3185. toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  3186. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3187. return;
  3188. }
  3189. startEmbeddedIframe( { target: el } );
  3190. } );
  3191. // Lazy loading iframes
  3192. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3193. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3194. return;
  3195. }
  3196. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  3197. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  3198. el.addEventListener( 'load', startEmbeddedIframe );
  3199. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  3200. }
  3201. } );
  3202. }
  3203. }
  3204. /**
  3205. * Starts playing an embedded video/audio element after
  3206. * it has finished loading.
  3207. *
  3208. * @param {object} event
  3209. */
  3210. function startEmbeddedMedia( event ) {
  3211. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3212. isVisible = !!closestParent( event.target, '.present' );
  3213. if( isAttachedToDOM && isVisible ) {
  3214. event.target.currentTime = 0;
  3215. event.target.play();
  3216. }
  3217. event.target.removeEventListener( 'loadeddata', startEmbeddedMedia );
  3218. }
  3219. /**
  3220. * "Starts" the content of an embedded iframe using the
  3221. * postMessage API.
  3222. *
  3223. * @param {object} event
  3224. */
  3225. function startEmbeddedIframe( event ) {
  3226. var iframe = event.target;
  3227. if( iframe && iframe.contentWindow ) {
  3228. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3229. isVisible = !!closestParent( event.target, '.present' );
  3230. if( isAttachedToDOM && isVisible ) {
  3231. // Prefer an explicit global autoplay setting
  3232. var autoplay = config.autoPlayMedia;
  3233. // If no global setting is available, fall back on the element's
  3234. // own autoplay setting
  3235. if( typeof autoplay !== 'boolean' ) {
  3236. autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
  3237. }
  3238. // YouTube postMessage API
  3239. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3240. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  3241. }
  3242. // Vimeo postMessage API
  3243. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3244. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  3245. }
  3246. // Generic postMessage API
  3247. else {
  3248. iframe.contentWindow.postMessage( 'slide:start', '*' );
  3249. }
  3250. }
  3251. }
  3252. }
  3253. /**
  3254. * Stop playback of any embedded content inside of
  3255. * the targeted slide.
  3256. *
  3257. * @param {HTMLElement} element
  3258. */
  3259. function stopEmbeddedContent( element, options ) {
  3260. options = extend( {
  3261. // Defaults
  3262. unloadIframes: true
  3263. }, options || {} );
  3264. if( element && element.parentNode ) {
  3265. // HTML5 media elements
  3266. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3267. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  3268. el.setAttribute('data-paused-by-reveal', '');
  3269. el.pause();
  3270. }
  3271. } );
  3272. // Generic postMessage API for non-lazy loaded iframes
  3273. toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  3274. if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
  3275. el.removeEventListener( 'load', startEmbeddedIframe );
  3276. });
  3277. // YouTube postMessage API
  3278. toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  3279. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3280. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  3281. }
  3282. });
  3283. // Vimeo postMessage API
  3284. toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  3285. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3286. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  3287. }
  3288. });
  3289. if( options.unloadIframes === true ) {
  3290. // Unload lazy-loaded iframes
  3291. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3292. // Only removing the src doesn't actually unload the frame
  3293. // in all browsers (Firefox) so we set it to blank first
  3294. el.setAttribute( 'src', 'about:blank' );
  3295. el.removeAttribute( 'src' );
  3296. } );
  3297. }
  3298. }
  3299. }
  3300. /**
  3301. * Returns the number of past slides. This can be used as a global
  3302. * flattened index for slides.
  3303. *
  3304. * @param {HTMLElement} [slide=currentSlide] The slide we're counting before
  3305. *
  3306. * @return {number} Past slide count
  3307. */
  3308. function getSlidePastCount( slide ) {
  3309. if( slide === undefined ) {
  3310. slide = currentSlide;
  3311. }
  3312. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3313. // The number of past slides
  3314. var pastCount = 0;
  3315. // Step through all slides and count the past ones
  3316. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  3317. var horizontalSlide = horizontalSlides[i];
  3318. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  3319. for( var j = 0; j < verticalSlides.length; j++ ) {
  3320. // Stop as soon as we arrive at the present
  3321. if( verticalSlides[j] === slide ) {
  3322. break mainLoop;
  3323. }
  3324. pastCount++;
  3325. }
  3326. // Stop as soon as we arrive at the present
  3327. if( horizontalSlide === slide ) {
  3328. break;
  3329. }
  3330. // Don't count the wrapping section for vertical slides
  3331. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  3332. pastCount++;
  3333. }
  3334. }
  3335. return pastCount;
  3336. }
  3337. /**
  3338. * Returns a value ranging from 0-1 that represents
  3339. * how far into the presentation we have navigated.
  3340. *
  3341. * @return {number}
  3342. */
  3343. function getProgress() {
  3344. // The number of past and total slides
  3345. var totalCount = getTotalSlides();
  3346. var pastCount = getSlidePastCount();
  3347. if( currentSlide ) {
  3348. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  3349. // If there are fragments in the current slide those should be
  3350. // accounted for in the progress.
  3351. if( allFragments.length > 0 ) {
  3352. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  3353. // This value represents how big a portion of the slide progress
  3354. // that is made up by its fragments (0-1)
  3355. var fragmentWeight = 0.9;
  3356. // Add fragment progress to the past slide count
  3357. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  3358. }
  3359. }
  3360. return Math.min( pastCount / ( totalCount - 1 ), 1 );
  3361. }
  3362. /**
  3363. * Checks if this presentation is running inside of the
  3364. * speaker notes window.
  3365. *
  3366. * @return {boolean}
  3367. */
  3368. function isSpeakerNotes() {
  3369. return !!window.location.search.match( /receiver/gi );
  3370. }
  3371. /**
  3372. * Reads the current URL (hash) and navigates accordingly.
  3373. */
  3374. function readURL() {
  3375. var hash = window.location.hash;
  3376. // Attempt to parse the hash as either an index or name
  3377. var bits = hash.slice( 2 ).split( '/' ),
  3378. name = hash.replace( /#|\//gi, '' );
  3379. // If the first bit is not fully numeric and there is a name we
  3380. // can assume that this is a named link
  3381. if( !/^[0-9]*$/.test( bits[0] ) && name.length ) {
  3382. var element;
  3383. // Ensure the named link is a valid HTML ID attribute
  3384. try {
  3385. element = document.getElementById( decodeURIComponent( name ) );
  3386. }
  3387. catch ( error ) { }
  3388. // Ensure that we're not already on a slide with the same name
  3389. var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
  3390. if( element ) {
  3391. // If the slide exists and is not the current slide...
  3392. if ( !isSameNameAsCurrentSlide ) {
  3393. // ...find the position of the named slide and navigate to it
  3394. var indices = Reveal.getIndices(element);
  3395. slide(indices.h, indices.v);
  3396. }
  3397. }
  3398. // If the slide doesn't exist, navigate to the current slide
  3399. else {
  3400. slide( indexh || 0, indexv || 0 );
  3401. }
  3402. }
  3403. else {
  3404. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  3405. // Read the index components of the hash
  3406. var h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,
  3407. v = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,
  3408. f;
  3409. if( config.fragmentInURL ) {
  3410. f = parseInt( bits[2], 10 );
  3411. if( isNaN( f ) ) {
  3412. f = undefined;
  3413. }
  3414. }
  3415. if( h !== indexh || v !== indexv || f !== undefined ) {
  3416. slide( h, v, f );
  3417. }
  3418. }
  3419. }
  3420. /**
  3421. * Updates the page URL (hash) to reflect the current
  3422. * state.
  3423. *
  3424. * @param {number} delay The time in ms to wait before
  3425. * writing the hash
  3426. */
  3427. function writeURL( delay ) {
  3428. // Make sure there's never more than one timeout running
  3429. clearTimeout( writeURLTimeout );
  3430. // If a delay is specified, timeout this call
  3431. if( typeof delay === 'number' ) {
  3432. writeURLTimeout = setTimeout( writeURL, delay );
  3433. }
  3434. else if( currentSlide ) {
  3435. // If we're configured to push to history OR the history
  3436. // API is not avaialble.
  3437. if( config.history || !window.history ) {
  3438. window.location.hash = locationHash();
  3439. }
  3440. // If we're configured to reflect the current slide in the
  3441. // URL without pushing to history.
  3442. else if( config.hash ) {
  3443. window.history.replaceState( null, null, '#' + locationHash() );
  3444. }
  3445. // If history and hash are both disabled, a hash may still
  3446. // be added to the URL by clicking on a href with a hash
  3447. // target. Counter this by always removing the hash.
  3448. else {
  3449. window.history.replaceState( null, null, window.location.pathname + window.location.search );
  3450. }
  3451. }
  3452. }
  3453. /**
  3454. * Retrieves the h/v location and fragment of the current,
  3455. * or specified, slide.
  3456. *
  3457. * @param {HTMLElement} [slide] If specified, the returned
  3458. * index will be for this slide rather than the currently
  3459. * active one
  3460. *
  3461. * @return {{h: number, v: number, f: number}}
  3462. */
  3463. function getIndices( slide ) {
  3464. // By default, return the current indices
  3465. var h = indexh,
  3466. v = indexv,
  3467. f;
  3468. // If a slide is specified, return the indices of that slide
  3469. if( slide ) {
  3470. var isVertical = isVerticalSlide( slide );
  3471. var slideh = isVertical ? slide.parentNode : slide;
  3472. // Select all horizontal slides
  3473. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3474. // Now that we know which the horizontal slide is, get its index
  3475. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  3476. // Assume we're not vertical
  3477. v = undefined;
  3478. // If this is a vertical slide, grab the vertical index
  3479. if( isVertical ) {
  3480. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  3481. }
  3482. }
  3483. if( !slide && currentSlide ) {
  3484. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  3485. if( hasFragments ) {
  3486. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  3487. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  3488. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  3489. }
  3490. else {
  3491. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  3492. }
  3493. }
  3494. }
  3495. return { h: h, v: v, f: f };
  3496. }
  3497. /**
  3498. * Retrieves all slides in this presentation.
  3499. */
  3500. function getSlides() {
  3501. return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ) );
  3502. }
  3503. /**
  3504. * Returns a list of all horizontal slides in the deck. Each
  3505. * vertical stack is included as one horizontal slide in the
  3506. * resulting array.
  3507. */
  3508. function getHorizontalSlides() {
  3509. return toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3510. }
  3511. /**
  3512. * Returns all vertical slides that exist within this deck.
  3513. */
  3514. function getVerticalSlides() {
  3515. return toArray( dom.wrapper.querySelectorAll( '.slides>section>section' ) );
  3516. }
  3517. /**
  3518. * Returns true if there are at least two horizontal slides.
  3519. */
  3520. function hasHorizontalSlides() {
  3521. return getHorizontalSlides().length > 1;
  3522. }
  3523. /**
  3524. * Returns true if there are at least two vertical slides.
  3525. */
  3526. function hasVerticalSlides() {
  3527. return getVerticalSlides().length > 1;
  3528. }
  3529. /**
  3530. * Returns an array of objects where each object represents the
  3531. * attributes on its respective slide.
  3532. */
  3533. function getSlidesAttributes() {
  3534. return getSlides().map( function( slide ) {
  3535. var attributes = {};
  3536. for( var i = 0; i < slide.attributes.length; i++ ) {
  3537. var attribute = slide.attributes[ i ];
  3538. attributes[ attribute.name ] = attribute.value;
  3539. }
  3540. return attributes;
  3541. } );
  3542. }
  3543. /**
  3544. * Retrieves the total number of slides in this presentation.
  3545. *
  3546. * @return {number}
  3547. */
  3548. function getTotalSlides() {
  3549. return getSlides().length;
  3550. }
  3551. /**
  3552. * Returns the slide element matching the specified index.
  3553. *
  3554. * @return {HTMLElement}
  3555. */
  3556. function getSlide( x, y ) {
  3557. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  3558. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  3559. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  3560. return verticalSlides ? verticalSlides[ y ] : undefined;
  3561. }
  3562. return horizontalSlide;
  3563. }
  3564. /**
  3565. * Returns the background element for the given slide.
  3566. * All slides, even the ones with no background properties
  3567. * defined, have a background element so as long as the
  3568. * index is valid an element will be returned.
  3569. *
  3570. * @param {mixed} x Horizontal background index OR a slide
  3571. * HTML element
  3572. * @param {number} y Vertical background index
  3573. * @return {(HTMLElement[]|*)}
  3574. */
  3575. function getSlideBackground( x, y ) {
  3576. var slide = typeof x === 'number' ? getSlide( x, y ) : x;
  3577. if( slide ) {
  3578. return slide.slideBackgroundElement;
  3579. }
  3580. return undefined;
  3581. }
  3582. /**
  3583. * Retrieves the speaker notes from a slide. Notes can be
  3584. * defined in two ways:
  3585. * 1. As a data-notes attribute on the slide <section>
  3586. * 2. As an <aside class="notes"> inside of the slide
  3587. *
  3588. * @param {HTMLElement} [slide=currentSlide]
  3589. * @return {(string|null)}
  3590. */
  3591. function getSlideNotes( slide ) {
  3592. // Default to the current slide
  3593. slide = slide || currentSlide;
  3594. // Notes can be specified via the data-notes attribute...
  3595. if( slide.hasAttribute( 'data-notes' ) ) {
  3596. return slide.getAttribute( 'data-notes' );
  3597. }
  3598. // ... or using an <aside class="notes"> element
  3599. var notesElement = slide.querySelector( 'aside.notes' );
  3600. if( notesElement ) {
  3601. return notesElement.innerHTML;
  3602. }
  3603. return null;
  3604. }
  3605. /**
  3606. * Retrieves the current state of the presentation as
  3607. * an object. This state can then be restored at any
  3608. * time.
  3609. *
  3610. * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
  3611. */
  3612. function getState() {
  3613. var indices = getIndices();
  3614. return {
  3615. indexh: indices.h,
  3616. indexv: indices.v,
  3617. indexf: indices.f,
  3618. paused: isPaused(),
  3619. overview: isOverview()
  3620. };
  3621. }
  3622. /**
  3623. * Restores the presentation to the given state.
  3624. *
  3625. * @param {object} state As generated by getState()
  3626. * @see {@link getState} generates the parameter `state`
  3627. */
  3628. function setState( state ) {
  3629. if( typeof state === 'object' ) {
  3630. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  3631. var pausedFlag = deserialize( state.paused ),
  3632. overviewFlag = deserialize( state.overview );
  3633. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  3634. togglePause( pausedFlag );
  3635. }
  3636. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  3637. toggleOverview( overviewFlag );
  3638. }
  3639. }
  3640. }
  3641. /**
  3642. * Return a sorted fragments list, ordered by an increasing
  3643. * "data-fragment-index" attribute.
  3644. *
  3645. * Fragments will be revealed in the order that they are returned by
  3646. * this function, so you can use the index attributes to control the
  3647. * order of fragment appearance.
  3648. *
  3649. * To maintain a sensible default fragment order, fragments are presumed
  3650. * to be passed in document order. This function adds a "fragment-index"
  3651. * attribute to each node if such an attribute is not already present,
  3652. * and sets that attribute to an integer value which is the position of
  3653. * the fragment within the fragments list.
  3654. *
  3655. * @param {object[]|*} fragments
  3656. * @param {boolean} grouped If true the returned array will contain
  3657. * nested arrays for all fragments with the same index
  3658. * @return {object[]} sorted Sorted array of fragments
  3659. */
  3660. function sortFragments( fragments, grouped ) {
  3661. fragments = toArray( fragments );
  3662. var ordered = [],
  3663. unordered = [],
  3664. sorted = [];
  3665. // Group ordered and unordered elements
  3666. fragments.forEach( function( fragment, i ) {
  3667. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  3668. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  3669. if( !ordered[index] ) {
  3670. ordered[index] = [];
  3671. }
  3672. ordered[index].push( fragment );
  3673. }
  3674. else {
  3675. unordered.push( [ fragment ] );
  3676. }
  3677. } );
  3678. // Append fragments without explicit indices in their
  3679. // DOM order
  3680. ordered = ordered.concat( unordered );
  3681. // Manually count the index up per group to ensure there
  3682. // are no gaps
  3683. var index = 0;
  3684. // Push all fragments in their sorted order to an array,
  3685. // this flattens the groups
  3686. ordered.forEach( function( group ) {
  3687. group.forEach( function( fragment ) {
  3688. sorted.push( fragment );
  3689. fragment.setAttribute( 'data-fragment-index', index );
  3690. } );
  3691. index ++;
  3692. } );
  3693. return grouped === true ? ordered : sorted;
  3694. }
  3695. /**
  3696. * Refreshes the fragments on the current slide so that they
  3697. * have the appropriate classes (.visible + .current-fragment).
  3698. *
  3699. * @param {number} [index] The index of the current fragment
  3700. * @param {array} [fragments] Array containing all fragments
  3701. * in the current slide
  3702. *
  3703. * @return {{shown: array, hidden: array}}
  3704. */
  3705. function updateFragments( index, fragments ) {
  3706. var changedFragments = {
  3707. shown: [],
  3708. hidden: []
  3709. };
  3710. if( currentSlide && config.fragments ) {
  3711. fragments = fragments || sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3712. if( fragments.length ) {
  3713. if( typeof index !== 'number' ) {
  3714. var currentFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3715. if( currentFragment ) {
  3716. index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3717. }
  3718. }
  3719. toArray( fragments ).forEach( function( el, i ) {
  3720. if( el.hasAttribute( 'data-fragment-index' ) ) {
  3721. i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
  3722. }
  3723. // Visible fragments
  3724. if( i <= index ) {
  3725. if( !el.classList.contains( 'visible' ) ) changedFragments.shown.push( el );
  3726. el.classList.add( 'visible' );
  3727. el.classList.remove( 'current-fragment' );
  3728. // Announce the fragments one by one to the Screen Reader
  3729. dom.statusDiv.textContent = getStatusText( el );
  3730. if( i === index ) {
  3731. el.classList.add( 'current-fragment' );
  3732. startEmbeddedContent( el );
  3733. }
  3734. }
  3735. // Hidden fragments
  3736. else {
  3737. if( el.classList.contains( 'visible' ) ) changedFragments.hidden.push( el );
  3738. el.classList.remove( 'visible' );
  3739. el.classList.remove( 'current-fragment' );
  3740. }
  3741. } );
  3742. }
  3743. }
  3744. return changedFragments;
  3745. }
  3746. /**
  3747. * Navigate to the specified slide fragment.
  3748. *
  3749. * @param {?number} index The index of the fragment that
  3750. * should be shown, -1 means all are invisible
  3751. * @param {number} offset Integer offset to apply to the
  3752. * fragment index
  3753. *
  3754. * @return {boolean} true if a change was made in any
  3755. * fragments visibility as part of this call
  3756. */
  3757. function navigateFragment( index, offset ) {
  3758. if( currentSlide && config.fragments ) {
  3759. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3760. if( fragments.length ) {
  3761. // If no index is specified, find the current
  3762. if( typeof index !== 'number' ) {
  3763. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3764. if( lastVisibleFragment ) {
  3765. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3766. }
  3767. else {
  3768. index = -1;
  3769. }
  3770. }
  3771. // If an offset is specified, apply it to the index
  3772. if( typeof offset === 'number' ) {
  3773. index += offset;
  3774. }
  3775. var changedFragments = updateFragments( index, fragments );
  3776. if( changedFragments.hidden.length ) {
  3777. dispatchEvent( 'fragmenthidden', { fragment: changedFragments.hidden[0], fragments: changedFragments.hidden } );
  3778. }
  3779. if( changedFragments.shown.length ) {
  3780. dispatchEvent( 'fragmentshown', { fragment: changedFragments.shown[0], fragments: changedFragments.shown } );
  3781. }
  3782. updateControls();
  3783. updateProgress();
  3784. if( config.fragmentInURL ) {
  3785. writeURL();
  3786. }
  3787. return !!( changedFragments.shown.length || changedFragments.hidden.length );
  3788. }
  3789. }
  3790. return false;
  3791. }
  3792. /**
  3793. * Navigate to the next slide fragment.
  3794. *
  3795. * @return {boolean} true if there was a next fragment,
  3796. * false otherwise
  3797. */
  3798. function nextFragment() {
  3799. return navigateFragment( null, 1 );
  3800. }
  3801. /**
  3802. * Navigate to the previous slide fragment.
  3803. *
  3804. * @return {boolean} true if there was a previous fragment,
  3805. * false otherwise
  3806. */
  3807. function previousFragment() {
  3808. return navigateFragment( null, -1 );
  3809. }
  3810. /**
  3811. * Cues a new automated slide if enabled in the config.
  3812. */
  3813. function cueAutoSlide() {
  3814. cancelAutoSlide();
  3815. if( currentSlide && config.autoSlide !== false ) {
  3816. var fragment = currentSlide.querySelector( '.current-fragment' );
  3817. // When the slide first appears there is no "current" fragment so
  3818. // we look for a data-autoslide timing on the first fragment
  3819. if( !fragment ) fragment = currentSlide.querySelector( '.fragment' );
  3820. var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
  3821. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  3822. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  3823. // Pick value in the following priority order:
  3824. // 1. Current fragment's data-autoslide
  3825. // 2. Current slide's data-autoslide
  3826. // 3. Parent slide's data-autoslide
  3827. // 4. Global autoSlide setting
  3828. if( fragmentAutoSlide ) {
  3829. autoSlide = parseInt( fragmentAutoSlide, 10 );
  3830. }
  3831. else if( slideAutoSlide ) {
  3832. autoSlide = parseInt( slideAutoSlide, 10 );
  3833. }
  3834. else if( parentAutoSlide ) {
  3835. autoSlide = parseInt( parentAutoSlide, 10 );
  3836. }
  3837. else {
  3838. autoSlide = config.autoSlide;
  3839. }
  3840. // If there are media elements with data-autoplay,
  3841. // automatically set the autoSlide duration to the
  3842. // length of that media. Not applicable if the slide
  3843. // is divided up into fragments.
  3844. // playbackRate is accounted for in the duration.
  3845. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  3846. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3847. if( el.hasAttribute( 'data-autoplay' ) ) {
  3848. if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
  3849. autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
  3850. }
  3851. }
  3852. } );
  3853. }
  3854. // Cue the next auto-slide if:
  3855. // - There is an autoSlide value
  3856. // - Auto-sliding isn't paused by the user
  3857. // - The presentation isn't paused
  3858. // - The overview isn't active
  3859. // - The presentation isn't over
  3860. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  3861. autoSlideTimeout = setTimeout( function() {
  3862. typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
  3863. cueAutoSlide();
  3864. }, autoSlide );
  3865. autoSlideStartTime = Date.now();
  3866. }
  3867. if( autoSlidePlayer ) {
  3868. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  3869. }
  3870. }
  3871. }
  3872. /**
  3873. * Cancels any ongoing request to auto-slide.
  3874. */
  3875. function cancelAutoSlide() {
  3876. clearTimeout( autoSlideTimeout );
  3877. autoSlideTimeout = -1;
  3878. }
  3879. function pauseAutoSlide() {
  3880. if( autoSlide && !autoSlidePaused ) {
  3881. autoSlidePaused = true;
  3882. dispatchEvent( 'autoslidepaused' );
  3883. clearTimeout( autoSlideTimeout );
  3884. if( autoSlidePlayer ) {
  3885. autoSlidePlayer.setPlaying( false );
  3886. }
  3887. }
  3888. }
  3889. function resumeAutoSlide() {
  3890. if( autoSlide && autoSlidePaused ) {
  3891. autoSlidePaused = false;
  3892. dispatchEvent( 'autoslideresumed' );
  3893. cueAutoSlide();
  3894. }
  3895. }
  3896. function navigateLeft() {
  3897. // Reverse for RTL
  3898. if( config.rtl ) {
  3899. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  3900. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3901. }
  3902. }
  3903. // Normal navigation
  3904. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  3905. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3906. }
  3907. }
  3908. function navigateRight() {
  3909. hasNavigatedRight = true;
  3910. // Reverse for RTL
  3911. if( config.rtl ) {
  3912. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  3913. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3914. }
  3915. }
  3916. // Normal navigation
  3917. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  3918. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3919. }
  3920. }
  3921. function navigateUp() {
  3922. // Prioritize hiding fragments
  3923. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  3924. slide( indexh, indexv - 1 );
  3925. }
  3926. }
  3927. function navigateDown() {
  3928. hasNavigatedDown = true;
  3929. // Prioritize revealing fragments
  3930. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  3931. slide( indexh, indexv + 1 );
  3932. }
  3933. }
  3934. /**
  3935. * Navigates backwards, prioritized in the following order:
  3936. * 1) Previous fragment
  3937. * 2) Previous vertical slide
  3938. * 3) Previous horizontal slide
  3939. */
  3940. function navigatePrev() {
  3941. // Prioritize revealing fragments
  3942. if( previousFragment() === false ) {
  3943. if( availableRoutes().up ) {
  3944. navigateUp();
  3945. }
  3946. else {
  3947. // Fetch the previous horizontal slide, if there is one
  3948. var previousSlide;
  3949. if( config.rtl ) {
  3950. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  3951. }
  3952. else {
  3953. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  3954. }
  3955. if( previousSlide ) {
  3956. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  3957. var h = indexh - 1;
  3958. slide( h, v );
  3959. }
  3960. }
  3961. }
  3962. }
  3963. /**
  3964. * The reverse of #navigatePrev().
  3965. */
  3966. function navigateNext() {
  3967. hasNavigatedRight = true;
  3968. hasNavigatedDown = true;
  3969. // Prioritize revealing fragments
  3970. if( nextFragment() === false ) {
  3971. var routes = availableRoutes();
  3972. // When looping is enabled `routes.down` is always available
  3973. // so we need a separate check for when we've reached the
  3974. // end of a stack and should move horizontally
  3975. if( routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide( currentSlide ) ) {
  3976. routes.down = false;
  3977. }
  3978. if( routes.down ) {
  3979. navigateDown();
  3980. }
  3981. else if( config.rtl ) {
  3982. navigateLeft();
  3983. }
  3984. else {
  3985. navigateRight();
  3986. }
  3987. }
  3988. }
  3989. /**
  3990. * Checks if the target element prevents the triggering of
  3991. * swipe navigation.
  3992. */
  3993. function isSwipePrevented( target ) {
  3994. while( target && typeof target.hasAttribute === 'function' ) {
  3995. if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
  3996. target = target.parentNode;
  3997. }
  3998. return false;
  3999. }
  4000. // --------------------------------------------------------------------//
  4001. // ----------------------------- EVENTS -------------------------------//
  4002. // --------------------------------------------------------------------//
  4003. /**
  4004. * Called by all event handlers that are based on user
  4005. * input.
  4006. *
  4007. * @param {object} [event]
  4008. */
  4009. function onUserInput( event ) {
  4010. if( config.autoSlideStoppable ) {
  4011. pauseAutoSlide();
  4012. }
  4013. }
  4014. /**
  4015. * Called whenever there is mouse input at the document level
  4016. * to determine if the cursor is active or not.
  4017. *
  4018. * @param {object} event
  4019. */
  4020. function onDocumentCursorActive( event ) {
  4021. showCursor();
  4022. clearTimeout( cursorInactiveTimeout );
  4023. cursorInactiveTimeout = setTimeout( hideCursor, config.hideCursorTime );
  4024. }
  4025. /**
  4026. * Handler for the document level 'keypress' event.
  4027. *
  4028. * @param {object} event
  4029. */
  4030. function onDocumentKeyPress( event ) {
  4031. // Check if the pressed key is question mark
  4032. if( event.shiftKey && event.charCode === 63 ) {
  4033. toggleHelp();
  4034. }
  4035. }
  4036. /**
  4037. * Handler for the document level 'keydown' event.
  4038. *
  4039. * @param {object} event
  4040. */
  4041. function onDocumentKeyDown( event ) {
  4042. // If there's a condition specified and it returns false,
  4043. // ignore this event
  4044. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
  4045. return true;
  4046. }
  4047. // Shorthand
  4048. var keyCode = event.keyCode;
  4049. // Remember if auto-sliding was paused so we can toggle it
  4050. var autoSlideWasPaused = autoSlidePaused;
  4051. onUserInput( event );
  4052. // Is there a focused element that could be using the keyboard?
  4053. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  4054. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  4055. var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
  4056. // Whitelist specific modified + keycode combinations
  4057. var prevSlideShortcut = event.shiftKey && event.keyCode === 32;
  4058. var firstSlideShortcut = event.shiftKey && keyCode === 37;
  4059. var lastSlideShortcut = event.shiftKey && keyCode === 39;
  4060. // Prevent all other events when a modifier is pressed
  4061. var unusedModifier = !prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
  4062. ( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );
  4063. // Disregard the event if there's a focused element or a
  4064. // keyboard modifier key is present
  4065. if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;
  4066. // While paused only allow resume keyboard events; 'b', 'v', '.'
  4067. var resumeKeyCodes = [66,86,190,191];
  4068. var key;
  4069. // Custom key bindings for togglePause should be able to resume
  4070. if( typeof config.keyboard === 'object' ) {
  4071. for( key in config.keyboard ) {
  4072. if( config.keyboard[key] === 'togglePause' ) {
  4073. resumeKeyCodes.push( parseInt( key, 10 ) );
  4074. }
  4075. }
  4076. }
  4077. if( isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
  4078. return false;
  4079. }
  4080. // Use linear navigation if we're configured to OR if
  4081. // the presentation is one-dimensional
  4082. var useLinearMode = config.navigationMode === 'linear' || !hasHorizontalSlides() || !hasVerticalSlides();
  4083. var triggered = false;
  4084. // 1. User defined key bindings
  4085. if( typeof config.keyboard === 'object' ) {
  4086. for( key in config.keyboard ) {
  4087. // Check if this binding matches the pressed key
  4088. if( parseInt( key, 10 ) === keyCode ) {
  4089. var value = config.keyboard[ key ];
  4090. // Callback function
  4091. if( typeof value === 'function' ) {
  4092. value.apply( null, [ event ] );
  4093. }
  4094. // String shortcuts to reveal.js API
  4095. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  4096. Reveal[ value ].call();
  4097. }
  4098. triggered = true;
  4099. }
  4100. }
  4101. }
  4102. // 2. Registered custom key bindings
  4103. if( triggered === false ) {
  4104. for( key in registeredKeyBindings ) {
  4105. // Check if this binding matches the pressed key
  4106. if( parseInt( key, 10 ) === keyCode ) {
  4107. var action = registeredKeyBindings[ key ].callback;
  4108. // Callback function
  4109. if( typeof action === 'function' ) {
  4110. action.apply( null, [ event ] );
  4111. }
  4112. // String shortcuts to reveal.js API
  4113. else if( typeof action === 'string' && typeof Reveal[ action ] === 'function' ) {
  4114. Reveal[ action ].call();
  4115. }
  4116. triggered = true;
  4117. }
  4118. }
  4119. }
  4120. // 3. System defined key bindings
  4121. if( triggered === false ) {
  4122. // Assume true and try to prove false
  4123. triggered = true;
  4124. // P, PAGE UP
  4125. if( keyCode === 80 || keyCode === 33 ) {
  4126. navigatePrev();
  4127. }
  4128. // N, PAGE DOWN
  4129. else if( keyCode === 78 || keyCode === 34 ) {
  4130. navigateNext();
  4131. }
  4132. // H, LEFT
  4133. else if( keyCode === 72 || keyCode === 37 ) {
  4134. if( firstSlideShortcut ) {
  4135. slide( 0 );
  4136. }
  4137. else if( !isOverview() && useLinearMode ) {
  4138. navigatePrev();
  4139. }
  4140. else {
  4141. navigateLeft();
  4142. }
  4143. }
  4144. // L, RIGHT
  4145. else if( keyCode === 76 || keyCode === 39 ) {
  4146. if( lastSlideShortcut ) {
  4147. slide( Number.MAX_VALUE );
  4148. }
  4149. else if( !isOverview() && useLinearMode ) {
  4150. navigateNext();
  4151. }
  4152. else {
  4153. navigateRight();
  4154. }
  4155. }
  4156. // K, UP
  4157. else if( keyCode === 75 || keyCode === 38 ) {
  4158. if( !isOverview() && useLinearMode ) {
  4159. navigatePrev();
  4160. }
  4161. else {
  4162. navigateUp();
  4163. }
  4164. }
  4165. // J, DOWN
  4166. else if( keyCode === 74 || keyCode === 40 ) {
  4167. if( !isOverview() && useLinearMode ) {
  4168. navigateNext();
  4169. }
  4170. else {
  4171. navigateDown();
  4172. }
  4173. }
  4174. // HOME
  4175. else if( keyCode === 36 ) {
  4176. slide( 0 );
  4177. }
  4178. // END
  4179. else if( keyCode === 35 ) {
  4180. slide( Number.MAX_VALUE );
  4181. }
  4182. // SPACE
  4183. else if( keyCode === 32 ) {
  4184. if( isOverview() ) {
  4185. deactivateOverview();
  4186. }
  4187. if( event.shiftKey ) {
  4188. navigatePrev();
  4189. }
  4190. else {
  4191. navigateNext();
  4192. }
  4193. }
  4194. // TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS "BLACK SCREEN" BUTTON
  4195. else if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {
  4196. togglePause();
  4197. }
  4198. // F
  4199. else if( keyCode === 70 ) {
  4200. enterFullscreen();
  4201. }
  4202. // A
  4203. else if( keyCode === 65 ) {
  4204. if ( config.autoSlideStoppable ) {
  4205. toggleAutoSlide( autoSlideWasPaused );
  4206. }
  4207. }
  4208. else {
  4209. triggered = false;
  4210. }
  4211. }
  4212. // If the input resulted in a triggered action we should prevent
  4213. // the browsers default behavior
  4214. if( triggered ) {
  4215. event.preventDefault && event.preventDefault();
  4216. }
  4217. // ESC or O key
  4218. else if ( ( keyCode === 27 || keyCode === 79 ) && features.transforms3d ) {
  4219. if( dom.overlay ) {
  4220. closeOverlay();
  4221. }
  4222. else {
  4223. toggleOverview();
  4224. }
  4225. event.preventDefault && event.preventDefault();
  4226. }
  4227. // If auto-sliding is enabled we need to cue up
  4228. // another timeout
  4229. cueAutoSlide();
  4230. }
  4231. /**
  4232. * Handler for the 'touchstart' event, enables support for
  4233. * swipe and pinch gestures.
  4234. *
  4235. * @param {object} event
  4236. */
  4237. function onTouchStart( event ) {
  4238. if( isSwipePrevented( event.target ) ) return true;
  4239. touch.startX = event.touches[0].clientX;
  4240. touch.startY = event.touches[0].clientY;
  4241. touch.startCount = event.touches.length;
  4242. }
  4243. /**
  4244. * Handler for the 'touchmove' event.
  4245. *
  4246. * @param {object} event
  4247. */
  4248. function onTouchMove( event ) {
  4249. if( isSwipePrevented( event.target ) ) return true;
  4250. // Each touch should only trigger one action
  4251. if( !touch.captured ) {
  4252. onUserInput( event );
  4253. var currentX = event.touches[0].clientX;
  4254. var currentY = event.touches[0].clientY;
  4255. // There was only one touch point, look for a swipe
  4256. if( event.touches.length === 1 && touch.startCount !== 2 ) {
  4257. var deltaX = currentX - touch.startX,
  4258. deltaY = currentY - touch.startY;
  4259. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4260. touch.captured = true;
  4261. if( config.navigationMode === 'linear' ) {
  4262. if( config.rtl ) {
  4263. navigateNext();
  4264. }
  4265. else {
  4266. navigatePrev();
  4267. }
  4268. }
  4269. else {
  4270. navigateLeft();
  4271. }
  4272. }
  4273. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4274. touch.captured = true;
  4275. if( config.navigationMode === 'linear' ) {
  4276. if( config.rtl ) {
  4277. navigatePrev();
  4278. }
  4279. else {
  4280. navigateNext();
  4281. }
  4282. }
  4283. else {
  4284. navigateRight();
  4285. }
  4286. }
  4287. else if( deltaY > touch.threshold ) {
  4288. touch.captured = true;
  4289. if( config.navigationMode === 'linear' ) {
  4290. navigatePrev();
  4291. }
  4292. else {
  4293. navigateUp();
  4294. }
  4295. }
  4296. else if( deltaY < -touch.threshold ) {
  4297. touch.captured = true;
  4298. if( config.navigationMode === 'linear' ) {
  4299. navigateNext();
  4300. }
  4301. else {
  4302. navigateDown();
  4303. }
  4304. }
  4305. // If we're embedded, only block touch events if they have
  4306. // triggered an action
  4307. if( config.embedded ) {
  4308. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  4309. event.preventDefault();
  4310. }
  4311. }
  4312. // Not embedded? Block them all to avoid needless tossing
  4313. // around of the viewport in iOS
  4314. else {
  4315. event.preventDefault();
  4316. }
  4317. }
  4318. }
  4319. // There's a bug with swiping on some Android devices unless
  4320. // the default action is always prevented
  4321. else if( UA.match( /android/gi ) ) {
  4322. event.preventDefault();
  4323. }
  4324. }
  4325. /**
  4326. * Handler for the 'touchend' event.
  4327. *
  4328. * @param {object} event
  4329. */
  4330. function onTouchEnd( event ) {
  4331. touch.captured = false;
  4332. }
  4333. /**
  4334. * Convert pointer down to touch start.
  4335. *
  4336. * @param {object} event
  4337. */
  4338. function onPointerDown( event ) {
  4339. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4340. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4341. onTouchStart( event );
  4342. }
  4343. }
  4344. /**
  4345. * Convert pointer move to touch move.
  4346. *
  4347. * @param {object} event
  4348. */
  4349. function onPointerMove( event ) {
  4350. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4351. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4352. onTouchMove( event );
  4353. }
  4354. }
  4355. /**
  4356. * Convert pointer up to touch end.
  4357. *
  4358. * @param {object} event
  4359. */
  4360. function onPointerUp( event ) {
  4361. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4362. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4363. onTouchEnd( event );
  4364. }
  4365. }
  4366. /**
  4367. * Handles mouse wheel scrolling, throttled to avoid skipping
  4368. * multiple slides.
  4369. *
  4370. * @param {object} event
  4371. */
  4372. function onDocumentMouseScroll( event ) {
  4373. if( Date.now() - lastMouseWheelStep > 600 ) {
  4374. lastMouseWheelStep = Date.now();
  4375. var delta = event.detail || -event.wheelDelta;
  4376. if( delta > 0 ) {
  4377. navigateNext();
  4378. }
  4379. else if( delta < 0 ) {
  4380. navigatePrev();
  4381. }
  4382. }
  4383. }
  4384. /**
  4385. * Clicking on the progress bar results in a navigation to the
  4386. * closest approximate horizontal slide using this equation:
  4387. *
  4388. * ( clickX / presentationWidth ) * numberOfSlides
  4389. *
  4390. * @param {object} event
  4391. */
  4392. function onProgressClicked( event ) {
  4393. onUserInput( event );
  4394. event.preventDefault();
  4395. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  4396. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  4397. if( config.rtl ) {
  4398. slideIndex = slidesTotal - slideIndex;
  4399. }
  4400. slide( slideIndex );
  4401. }
  4402. /**
  4403. * Event handler for navigation control buttons.
  4404. */
  4405. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigatePrev() : navigateLeft(); }
  4406. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigateNext() : navigateRight(); }
  4407. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  4408. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  4409. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  4410. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  4411. /**
  4412. * Handler for the window level 'hashchange' event.
  4413. *
  4414. * @param {object} [event]
  4415. */
  4416. function onWindowHashChange( event ) {
  4417. readURL();
  4418. }
  4419. /**
  4420. * Handler for the window level 'resize' event.
  4421. *
  4422. * @param {object} [event]
  4423. */
  4424. function onWindowResize( event ) {
  4425. layout();
  4426. }
  4427. /**
  4428. * Handle for the window level 'visibilitychange' event.
  4429. *
  4430. * @param {object} [event]
  4431. */
  4432. function onPageVisibilityChange( event ) {
  4433. var isHidden = document.webkitHidden ||
  4434. document.msHidden ||
  4435. document.hidden;
  4436. // If, after clicking a link or similar and we're coming back,
  4437. // focus the document.body to ensure we can use keyboard shortcuts
  4438. if( isHidden === false && document.activeElement !== document.body ) {
  4439. // Not all elements support .blur() - SVGs among them.
  4440. if( typeof document.activeElement.blur === 'function' ) {
  4441. document.activeElement.blur();
  4442. }
  4443. document.body.focus();
  4444. }
  4445. }
  4446. /**
  4447. * Invoked when a slide is and we're in the overview.
  4448. *
  4449. * @param {object} event
  4450. */
  4451. function onOverviewSlideClicked( event ) {
  4452. // TODO There's a bug here where the event listeners are not
  4453. // removed after deactivating the overview.
  4454. if( eventsAreBound && isOverview() ) {
  4455. event.preventDefault();
  4456. var element = event.target;
  4457. while( element && !element.nodeName.match( /section/gi ) ) {
  4458. element = element.parentNode;
  4459. }
  4460. if( element && !element.classList.contains( 'disabled' ) ) {
  4461. deactivateOverview();
  4462. if( element.nodeName.match( /section/gi ) ) {
  4463. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  4464. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  4465. slide( h, v );
  4466. }
  4467. }
  4468. }
  4469. }
  4470. /**
  4471. * Handles clicks on links that are set to preview in the
  4472. * iframe overlay.
  4473. *
  4474. * @param {object} event
  4475. */
  4476. function onPreviewLinkClicked( event ) {
  4477. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  4478. var url = event.currentTarget.getAttribute( 'href' );
  4479. if( url ) {
  4480. showPreview( url );
  4481. event.preventDefault();
  4482. }
  4483. }
  4484. }
  4485. /**
  4486. * Handles click on the auto-sliding controls element.
  4487. *
  4488. * @param {object} [event]
  4489. */
  4490. function onAutoSlidePlayerClick( event ) {
  4491. // Replay
  4492. if( Reveal.isLastSlide() && config.loop === false ) {
  4493. slide( 0, 0 );
  4494. resumeAutoSlide();
  4495. }
  4496. // Resume
  4497. else if( autoSlidePaused ) {
  4498. resumeAutoSlide();
  4499. }
  4500. // Pause
  4501. else {
  4502. pauseAutoSlide();
  4503. }
  4504. }
  4505. // --------------------------------------------------------------------//
  4506. // ------------------------ PLAYBACK COMPONENT ------------------------//
  4507. // --------------------------------------------------------------------//
  4508. /**
  4509. * Constructor for the playback component, which displays
  4510. * play/pause/progress controls.
  4511. *
  4512. * @param {HTMLElement} container The component will append
  4513. * itself to this
  4514. * @param {function} progressCheck A method which will be
  4515. * called frequently to get the current progress on a range
  4516. * of 0-1
  4517. */
  4518. function Playback( container, progressCheck ) {
  4519. // Cosmetics
  4520. this.diameter = 100;
  4521. this.diameter2 = this.diameter/2;
  4522. this.thickness = 6;
  4523. // Flags if we are currently playing
  4524. this.playing = false;
  4525. // Current progress on a 0-1 range
  4526. this.progress = 0;
  4527. // Used to loop the animation smoothly
  4528. this.progressOffset = 1;
  4529. this.container = container;
  4530. this.progressCheck = progressCheck;
  4531. this.canvas = document.createElement( 'canvas' );
  4532. this.canvas.className = 'playback';
  4533. this.canvas.width = this.diameter;
  4534. this.canvas.height = this.diameter;
  4535. this.canvas.style.width = this.diameter2 + 'px';
  4536. this.canvas.style.height = this.diameter2 + 'px';
  4537. this.context = this.canvas.getContext( '2d' );
  4538. this.container.appendChild( this.canvas );
  4539. this.render();
  4540. }
  4541. /**
  4542. * @param value
  4543. */
  4544. Playback.prototype.setPlaying = function( value ) {
  4545. var wasPlaying = this.playing;
  4546. this.playing = value;
  4547. // Start repainting if we weren't already
  4548. if( !wasPlaying && this.playing ) {
  4549. this.animate();
  4550. }
  4551. else {
  4552. this.render();
  4553. }
  4554. };
  4555. Playback.prototype.animate = function() {
  4556. var progressBefore = this.progress;
  4557. this.progress = this.progressCheck();
  4558. // When we loop, offset the progress so that it eases
  4559. // smoothly rather than immediately resetting
  4560. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  4561. this.progressOffset = this.progress;
  4562. }
  4563. this.render();
  4564. if( this.playing ) {
  4565. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  4566. }
  4567. };
  4568. /**
  4569. * Renders the current progress and playback state.
  4570. */
  4571. Playback.prototype.render = function() {
  4572. var progress = this.playing ? this.progress : 0,
  4573. radius = ( this.diameter2 ) - this.thickness,
  4574. x = this.diameter2,
  4575. y = this.diameter2,
  4576. iconSize = 28;
  4577. // Ease towards 1
  4578. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  4579. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  4580. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  4581. this.context.save();
  4582. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  4583. // Solid background color
  4584. this.context.beginPath();
  4585. this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
  4586. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  4587. this.context.fill();
  4588. // Draw progress track
  4589. this.context.beginPath();
  4590. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  4591. this.context.lineWidth = this.thickness;
  4592. this.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';
  4593. this.context.stroke();
  4594. if( this.playing ) {
  4595. // Draw progress on top of track
  4596. this.context.beginPath();
  4597. this.context.arc( x, y, radius, startAngle, endAngle, false );
  4598. this.context.lineWidth = this.thickness;
  4599. this.context.strokeStyle = '#fff';
  4600. this.context.stroke();
  4601. }
  4602. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  4603. // Draw play/pause icons
  4604. if( this.playing ) {
  4605. this.context.fillStyle = '#fff';
  4606. this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
  4607. this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
  4608. }
  4609. else {
  4610. this.context.beginPath();
  4611. this.context.translate( 4, 0 );
  4612. this.context.moveTo( 0, 0 );
  4613. this.context.lineTo( iconSize - 4, iconSize / 2 );
  4614. this.context.lineTo( 0, iconSize );
  4615. this.context.fillStyle = '#fff';
  4616. this.context.fill();
  4617. }
  4618. this.context.restore();
  4619. };
  4620. Playback.prototype.on = function( type, listener ) {
  4621. this.canvas.addEventListener( type, listener, false );
  4622. };
  4623. Playback.prototype.off = function( type, listener ) {
  4624. this.canvas.removeEventListener( type, listener, false );
  4625. };
  4626. Playback.prototype.destroy = function() {
  4627. this.playing = false;
  4628. if( this.canvas.parentNode ) {
  4629. this.container.removeChild( this.canvas );
  4630. }
  4631. };
  4632. // --------------------------------------------------------------------//
  4633. // ------------------------------- API --------------------------------//
  4634. // --------------------------------------------------------------------//
  4635. Reveal = {
  4636. VERSION: VERSION,
  4637. initialize: initialize,
  4638. configure: configure,
  4639. sync: sync,
  4640. syncSlide: syncSlide,
  4641. syncFragments: syncFragments,
  4642. // Navigation methods
  4643. slide: slide,
  4644. left: navigateLeft,
  4645. right: navigateRight,
  4646. up: navigateUp,
  4647. down: navigateDown,
  4648. prev: navigatePrev,
  4649. next: navigateNext,
  4650. // Fragment methods
  4651. navigateFragment: navigateFragment,
  4652. prevFragment: previousFragment,
  4653. nextFragment: nextFragment,
  4654. // Deprecated aliases
  4655. navigateTo: slide,
  4656. navigateLeft: navigateLeft,
  4657. navigateRight: navigateRight,
  4658. navigateUp: navigateUp,
  4659. navigateDown: navigateDown,
  4660. navigatePrev: navigatePrev,
  4661. navigateNext: navigateNext,
  4662. // Forces an update in slide layout
  4663. layout: layout,
  4664. // Randomizes the order of slides
  4665. shuffle: shuffle,
  4666. // Returns an object with the available routes as booleans (left/right/top/bottom)
  4667. availableRoutes: availableRoutes,
  4668. // Returns an object with the available fragments as booleans (prev/next)
  4669. availableFragments: availableFragments,
  4670. // Toggles a help overlay with keyboard shortcuts
  4671. toggleHelp: toggleHelp,
  4672. // Toggles the overview mode on/off
  4673. toggleOverview: toggleOverview,
  4674. // Toggles the "black screen" mode on/off
  4675. togglePause: togglePause,
  4676. // Toggles the auto slide mode on/off
  4677. toggleAutoSlide: toggleAutoSlide,
  4678. // State checks
  4679. isOverview: isOverview,
  4680. isPaused: isPaused,
  4681. isAutoSliding: isAutoSliding,
  4682. isSpeakerNotes: isSpeakerNotes,
  4683. // Slide preloading
  4684. loadSlide: loadSlide,
  4685. unloadSlide: unloadSlide,
  4686. // Adds or removes all internal event listeners (such as keyboard)
  4687. addEventListeners: addEventListeners,
  4688. removeEventListeners: removeEventListeners,
  4689. // Facility for persisting and restoring the presentation state
  4690. getState: getState,
  4691. setState: setState,
  4692. // Presentation progress
  4693. getSlidePastCount: getSlidePastCount,
  4694. // Presentation progress on range of 0-1
  4695. getProgress: getProgress,
  4696. // Returns the indices of the current, or specified, slide
  4697. getIndices: getIndices,
  4698. // Returns an Array of all slides
  4699. getSlides: getSlides,
  4700. // Returns an Array of objects representing the attributes on
  4701. // the slides
  4702. getSlidesAttributes: getSlidesAttributes,
  4703. // Returns the total number of slides
  4704. getTotalSlides: getTotalSlides,
  4705. // Returns the slide element at the specified index
  4706. getSlide: getSlide,
  4707. // Returns the slide background element at the specified index
  4708. getSlideBackground: getSlideBackground,
  4709. // Returns the speaker notes string for a slide, or null
  4710. getSlideNotes: getSlideNotes,
  4711. // Returns an array with all horizontal/vertical slides in the deck
  4712. getHorizontalSlides: getHorizontalSlides,
  4713. getVerticalSlides: getVerticalSlides,
  4714. // Checks if the presentation contains two or more
  4715. // horizontal/vertical slides
  4716. hasHorizontalSlides: hasHorizontalSlides,
  4717. hasVerticalSlides: hasVerticalSlides,
  4718. // Returns the previous slide element, may be null
  4719. getPreviousSlide: function() {
  4720. return previousSlide;
  4721. },
  4722. // Returns the current slide element
  4723. getCurrentSlide: function() {
  4724. return currentSlide;
  4725. },
  4726. // Returns the current scale of the presentation content
  4727. getScale: function() {
  4728. return scale;
  4729. },
  4730. // Returns the current configuration object
  4731. getConfig: function() {
  4732. return config;
  4733. },
  4734. // Helper method, retrieves query string as a key/value hash
  4735. getQueryHash: function() {
  4736. var query = {};
  4737. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  4738. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  4739. } );
  4740. // Basic deserialization
  4741. for( var i in query ) {
  4742. var value = query[ i ];
  4743. query[ i ] = deserialize( unescape( value ) );
  4744. }
  4745. return query;
  4746. },
  4747. // Returns the top-level DOM element
  4748. getRevealElement: function() {
  4749. return dom.wrapper || document.querySelector( '.reveal' );
  4750. },
  4751. // Returns a hash with all registered plugins
  4752. getPlugins: function() {
  4753. return plugins;
  4754. },
  4755. // Returns true if we're currently on the first slide
  4756. isFirstSlide: function() {
  4757. return ( indexh === 0 && indexv === 0 );
  4758. },
  4759. // Returns true if we're currently on the last slide
  4760. isLastSlide: function() {
  4761. if( currentSlide ) {
  4762. // Does this slide have a next sibling?
  4763. if( currentSlide.nextElementSibling ) return false;
  4764. // If it's vertical, does its parent have a next sibling?
  4765. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  4766. return true;
  4767. }
  4768. return false;
  4769. },
  4770. // Returns true if we're on the last slide in the current
  4771. // vertical stack
  4772. isLastVerticalSlide: function() {
  4773. if( currentSlide && isVerticalSlide( currentSlide ) ) {
  4774. // Does this slide have a next sibling?
  4775. if( currentSlide.nextElementSibling ) return false;
  4776. return true;
  4777. }
  4778. return false;
  4779. },
  4780. // Checks if reveal.js has been loaded and is ready for use
  4781. isReady: function() {
  4782. return loaded;
  4783. },
  4784. // Forward event binding to the reveal DOM element
  4785. addEventListener: function( type, listener, useCapture ) {
  4786. if( 'addEventListener' in window ) {
  4787. Reveal.getRevealElement().addEventListener( type, listener, useCapture );
  4788. }
  4789. },
  4790. removeEventListener: function( type, listener, useCapture ) {
  4791. if( 'addEventListener' in window ) {
  4792. Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
  4793. }
  4794. },
  4795. // Adds/removes a custom key binding
  4796. addKeyBinding: addKeyBinding,
  4797. removeKeyBinding: removeKeyBinding,
  4798. // API for registering and retrieving plugins
  4799. registerPlugin: registerPlugin,
  4800. hasPlugin: hasPlugin,
  4801. getPlugin: getPlugin,
  4802. // Programmatically triggers a keyboard event
  4803. triggerKey: function( keyCode ) {
  4804. onDocumentKeyDown( { keyCode: keyCode } );
  4805. },
  4806. // Registers a new shortcut to include in the help overlay
  4807. registerKeyboardShortcut: function( key, value ) {
  4808. keyboardShortcuts[key] = value;
  4809. }
  4810. };
  4811. return Reveal;
  4812. }));