reveal.js 165 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. isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
  342. var testElement = document.createElement( 'div' );
  343. features.transforms3d = 'WebkitPerspective' in testElement.style ||
  344. 'MozPerspective' in testElement.style ||
  345. 'msPerspective' in testElement.style ||
  346. 'OPerspective' in testElement.style ||
  347. 'perspective' in testElement.style;
  348. features.transforms2d = 'WebkitTransform' in testElement.style ||
  349. 'MozTransform' in testElement.style ||
  350. 'msTransform' in testElement.style ||
  351. 'OTransform' in testElement.style ||
  352. 'transform' in testElement.style;
  353. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  354. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  355. features.canvas = !!document.createElement( 'canvas' ).getContext;
  356. // Transitions in the overview are disabled in desktop and
  357. // Safari due to lag
  358. features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );
  359. // Flags if we should use zoom instead of transform to scale
  360. // up slides. Zoom produces crisper results but has a lot of
  361. // xbrowser quirks so we only use it in whitelsited browsers.
  362. features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
  363. ( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
  364. }
  365. /**
  366. * Loads the dependencies of reveal.js. Dependencies are
  367. * defined via the configuration option 'dependencies'
  368. * and will be loaded prior to starting/binding reveal.js.
  369. * Some dependencies may have an 'async' flag, if so they
  370. * will load after reveal.js has been started up.
  371. */
  372. function load() {
  373. var scripts = [],
  374. scriptsToLoad = 0;
  375. config.dependencies.forEach( function( s ) {
  376. // Load if there's no condition or the condition is truthy
  377. if( !s.condition || s.condition() ) {
  378. if( s.async ) {
  379. asyncDependencies.push( s );
  380. }
  381. else {
  382. scripts.push( s );
  383. }
  384. }
  385. } );
  386. if( scripts.length ) {
  387. scriptsToLoad = scripts.length;
  388. // Load synchronous scripts
  389. scripts.forEach( function( s ) {
  390. loadScript( s.src, function() {
  391. if( typeof s.callback === 'function' ) s.callback();
  392. if( --scriptsToLoad === 0 ) {
  393. initPlugins();
  394. }
  395. } );
  396. } );
  397. }
  398. else {
  399. initPlugins();
  400. }
  401. }
  402. /**
  403. * Initializes our plugins and waits for them to be ready
  404. * before proceeding.
  405. */
  406. function initPlugins() {
  407. var pluginsToInitialize = Object.keys( plugins ).length;
  408. // If there are no plugins, skip this step
  409. if( pluginsToInitialize === 0 ) {
  410. loadAsyncDependencies();
  411. }
  412. // ... otherwise initialize plugins
  413. else {
  414. var afterPlugInitialized = function() {
  415. if( --pluginsToInitialize === 0 ) {
  416. loadAsyncDependencies();
  417. }
  418. };
  419. for( var i in plugins ) {
  420. var plugin = plugins[i];
  421. // If the plugin has an 'init' method, invoke it
  422. if( typeof plugin.init === 'function' ) {
  423. var callback = plugin.init();
  424. // If the plugin returned a Promise, wait for it
  425. if( callback && typeof callback.then === 'function' ) {
  426. callback.then( afterPlugInitialized );
  427. }
  428. else {
  429. afterPlugInitialized();
  430. }
  431. }
  432. else {
  433. afterPlugInitialized();
  434. }
  435. }
  436. }
  437. }
  438. /**
  439. * Loads all async reveal.js dependencies.
  440. */
  441. function loadAsyncDependencies() {
  442. if( asyncDependencies.length ) {
  443. asyncDependencies.forEach( function( s ) {
  444. loadScript( s.src, s.callback );
  445. } );
  446. }
  447. start();
  448. }
  449. /**
  450. * Loads a JavaScript file from the given URL and executes it.
  451. *
  452. * @param {string} url Address of the .js file to load
  453. * @param {function} callback Method to invoke when the script
  454. * has loaded and executed
  455. */
  456. function loadScript( url, callback ) {
  457. var script = document.createElement( 'script' );
  458. script.type = 'text/javascript';
  459. script.async = false;
  460. script.defer = false;
  461. script.src = url;
  462. if( callback ) {
  463. // Success callback
  464. script.onload = script.onreadystatechange = function( event ) {
  465. if( event.type === "load" || (/loaded|complete/.test( script.readyState ) ) ) {
  466. // Kill event listeners
  467. script.onload = script.onreadystatechange = script.onerror = null;
  468. callback();
  469. }
  470. };
  471. // Error callback
  472. script.onerror = function( err ) {
  473. // Kill event listeners
  474. script.onload = script.onreadystatechange = script.onerror = null;
  475. callback( new Error( 'Failed loading script: ' + script.src + '\n' + err) );
  476. };
  477. }
  478. // Append the script at the end of <head>
  479. var head = document.querySelector( 'head' );
  480. head.insertBefore( script, head.lastChild );
  481. }
  482. /**
  483. * Starts up reveal.js by binding input events and navigating
  484. * to the current URL deeplink if there is one.
  485. */
  486. function start() {
  487. loaded = true;
  488. // Make sure we've got all the DOM elements we need
  489. setupDOM();
  490. // Listen to messages posted to this window
  491. setupPostMessage();
  492. // Prevent the slides from being scrolled out of view
  493. setupScrollPrevention();
  494. // Resets all vertical slides so that only the first is visible
  495. resetVerticalSlides();
  496. // Updates the presentation to match the current configuration values
  497. configure();
  498. // Read the initial hash
  499. readURL();
  500. // Update all backgrounds
  501. updateBackground( true );
  502. // Notify listeners that the presentation is ready but use a 1ms
  503. // timeout to ensure it's not fired synchronously after #initialize()
  504. setTimeout( function() {
  505. // Enable transitions now that we're loaded
  506. dom.slides.classList.remove( 'no-transition' );
  507. dom.wrapper.classList.add( 'ready' );
  508. dispatchEvent( 'ready', {
  509. 'indexh': indexh,
  510. 'indexv': indexv,
  511. 'currentSlide': currentSlide
  512. } );
  513. }, 1 );
  514. // Special setup and config is required when printing to PDF
  515. if( isPrintingPDF() ) {
  516. removeEventListeners();
  517. // The document needs to have loaded for the PDF layout
  518. // measurements to be accurate
  519. if( document.readyState === 'complete' ) {
  520. setupPDF();
  521. }
  522. else {
  523. window.addEventListener( 'load', setupPDF );
  524. }
  525. }
  526. }
  527. /**
  528. * Finds and stores references to DOM elements which are
  529. * required by the presentation. If a required element is
  530. * not found, it is created.
  531. */
  532. function setupDOM() {
  533. // Prevent transitions while we're loading
  534. dom.slides.classList.add( 'no-transition' );
  535. if( isMobileDevice ) {
  536. dom.wrapper.classList.add( 'no-hover' );
  537. }
  538. else {
  539. dom.wrapper.classList.remove( 'no-hover' );
  540. }
  541. if( /iphone/gi.test( UA ) ) {
  542. dom.wrapper.classList.add( 'ua-iphone' );
  543. }
  544. else {
  545. dom.wrapper.classList.remove( 'ua-iphone' );
  546. }
  547. // Background element
  548. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  549. // Progress bar
  550. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  551. dom.progressbar = dom.progress.querySelector( 'span' );
  552. // Arrow controls
  553. dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls',
  554. '<button class="navigate-left" aria-label="previous slide"><div class="controls-arrow"></div></button>' +
  555. '<button class="navigate-right" aria-label="next slide"><div class="controls-arrow"></div></button>' +
  556. '<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>' +
  557. '<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></button>' );
  558. // Slide number
  559. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  560. // Element containing notes that are visible to the audience
  561. dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
  562. dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
  563. dom.speakerNotes.setAttribute( 'tabindex', '0' );
  564. // Overlay graphic which is displayed during the paused mode
  565. dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class="resume-button">Resume presentation</button>' : null );
  566. dom.wrapper.setAttribute( 'role', 'application' );
  567. // There can be multiple instances of controls throughout the page
  568. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  569. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  570. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  571. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  572. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  573. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  574. // The right and down arrows in the standard reveal.js controls
  575. dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' );
  576. dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' );
  577. dom.statusDiv = createStatusDiv();
  578. }
  579. /**
  580. * Creates a hidden div with role aria-live to announce the
  581. * current slide content. Hide the div off-screen to make it
  582. * available only to Assistive Technologies.
  583. *
  584. * @return {HTMLElement}
  585. */
  586. function createStatusDiv() {
  587. var statusDiv = document.getElementById( 'aria-status-div' );
  588. if( !statusDiv ) {
  589. statusDiv = document.createElement( 'div' );
  590. statusDiv.style.position = 'absolute';
  591. statusDiv.style.height = '1px';
  592. statusDiv.style.width = '1px';
  593. statusDiv.style.overflow = 'hidden';
  594. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  595. statusDiv.setAttribute( 'id', 'aria-status-div' );
  596. statusDiv.setAttribute( 'aria-live', 'polite' );
  597. statusDiv.setAttribute( 'aria-atomic','true' );
  598. dom.wrapper.appendChild( statusDiv );
  599. }
  600. return statusDiv;
  601. }
  602. /**
  603. * Converts the given HTML element into a string of text
  604. * that can be announced to a screen reader. Hidden
  605. * elements are excluded.
  606. */
  607. function getStatusText( node ) {
  608. var text = '';
  609. // Text node
  610. if( node.nodeType === 3 ) {
  611. text += node.textContent;
  612. }
  613. // Element node
  614. else if( node.nodeType === 1 ) {
  615. var isAriaHidden = node.getAttribute( 'aria-hidden' );
  616. var isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
  617. if( isAriaHidden !== 'true' && !isDisplayHidden ) {
  618. toArray( node.childNodes ).forEach( function( child ) {
  619. text += getStatusText( child );
  620. } );
  621. }
  622. }
  623. return text;
  624. }
  625. /**
  626. * Configures the presentation for printing to a static
  627. * PDF.
  628. */
  629. function setupPDF() {
  630. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  631. // Dimensions of the PDF pages
  632. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  633. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  634. // Dimensions of slides within the pages
  635. var slideWidth = slideSize.width,
  636. slideHeight = slideSize.height;
  637. // Let the browser know what page size we want to print
  638. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
  639. // Limit the size of certain elements to the dimensions of the slide
  640. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  641. document.body.classList.add( 'print-pdf' );
  642. document.body.style.width = pageWidth + 'px';
  643. document.body.style.height = pageHeight + 'px';
  644. // Make sure stretch elements fit on slide
  645. layoutSlideContents( slideWidth, slideHeight );
  646. // Add each slide's index as attributes on itself, we need these
  647. // indices to generate slide numbers below
  648. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  649. hslide.setAttribute( 'data-index-h', h );
  650. if( hslide.classList.contains( 'stack' ) ) {
  651. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  652. vslide.setAttribute( 'data-index-h', h );
  653. vslide.setAttribute( 'data-index-v', v );
  654. } );
  655. }
  656. } );
  657. // Slide and slide background layout
  658. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  659. // Vertical stacks are not centred since their section
  660. // children will be
  661. if( slide.classList.contains( 'stack' ) === false ) {
  662. // Center the slide inside of the page, giving the slide some margin
  663. var left = ( pageWidth - slideWidth ) / 2,
  664. top = ( pageHeight - slideHeight ) / 2;
  665. var contentHeight = slide.scrollHeight;
  666. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  667. // Adhere to configured pages per slide limit
  668. numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
  669. // Center slides vertically
  670. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  671. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  672. }
  673. // Wrap the slide in a page element and hide its overflow
  674. // so that no page ever flows onto another
  675. var page = document.createElement( 'div' );
  676. page.className = 'pdf-page';
  677. page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
  678. slide.parentNode.insertBefore( page, slide );
  679. page.appendChild( slide );
  680. // Position the slide inside of the page
  681. slide.style.left = left + 'px';
  682. slide.style.top = top + 'px';
  683. slide.style.width = slideWidth + 'px';
  684. if( slide.slideBackgroundElement ) {
  685. page.insertBefore( slide.slideBackgroundElement, slide );
  686. }
  687. // Inject notes if `showNotes` is enabled
  688. if( config.showNotes ) {
  689. // Are there notes for this slide?
  690. var notes = getSlideNotes( slide );
  691. if( notes ) {
  692. var notesSpacing = 8;
  693. var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
  694. var notesElement = document.createElement( 'div' );
  695. notesElement.classList.add( 'speaker-notes' );
  696. notesElement.classList.add( 'speaker-notes-pdf' );
  697. notesElement.setAttribute( 'data-layout', notesLayout );
  698. notesElement.innerHTML = notes;
  699. if( notesLayout === 'separate-page' ) {
  700. page.parentNode.insertBefore( notesElement, page.nextSibling );
  701. }
  702. else {
  703. notesElement.style.left = notesSpacing + 'px';
  704. notesElement.style.bottom = notesSpacing + 'px';
  705. notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
  706. page.appendChild( notesElement );
  707. }
  708. }
  709. }
  710. // Inject slide numbers if `slideNumbers` are enabled
  711. if( config.slideNumber && /all|print/i.test( config.showSlideNumber ) ) {
  712. var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1,
  713. slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1;
  714. var numberElement = document.createElement( 'div' );
  715. numberElement.classList.add( 'slide-number' );
  716. numberElement.classList.add( 'slide-number-pdf' );
  717. numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV );
  718. page.appendChild( numberElement );
  719. }
  720. // Copy page and show fragments one after another
  721. if( config.pdfSeparateFragments ) {
  722. // Each fragment 'group' is an array containing one or more
  723. // fragments. Multiple fragments that appear at the same time
  724. // are part of the same group.
  725. var fragmentGroups = sortFragments( page.querySelectorAll( '.fragment' ), true );
  726. var previousFragmentStep;
  727. var previousPage;
  728. fragmentGroups.forEach( function( fragments ) {
  729. // Remove 'current-fragment' from the previous group
  730. if( previousFragmentStep ) {
  731. previousFragmentStep.forEach( function( fragment ) {
  732. fragment.classList.remove( 'current-fragment' );
  733. } );
  734. }
  735. // Show the fragments for the current index
  736. fragments.forEach( function( fragment ) {
  737. fragment.classList.add( 'visible', 'current-fragment' );
  738. } );
  739. // Create a separate page for the current fragment state
  740. var clonedPage = page.cloneNode( true );
  741. page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
  742. previousFragmentStep = fragments;
  743. previousPage = clonedPage;
  744. } );
  745. // Reset the first/original page so that all fragments are hidden
  746. fragmentGroups.forEach( function( fragments ) {
  747. fragments.forEach( function( fragment ) {
  748. fragment.classList.remove( 'visible', 'current-fragment' );
  749. } );
  750. } );
  751. }
  752. // Show all fragments
  753. else {
  754. toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) {
  755. fragment.classList.add( 'visible' );
  756. } );
  757. }
  758. }
  759. } );
  760. // Notify subscribers that the PDF layout is good to go
  761. dispatchEvent( 'pdf-ready' );
  762. }
  763. /**
  764. * This is an unfortunate necessity. Some actions – such as
  765. * an input field being focused in an iframe or using the
  766. * keyboard to expand text selection beyond the bounds of
  767. * a slide – can trigger our content to be pushed out of view.
  768. * This scrolling can not be prevented by hiding overflow in
  769. * CSS (we already do) so we have to resort to repeatedly
  770. * checking if the slides have been offset :(
  771. */
  772. function setupScrollPrevention() {
  773. setInterval( function() {
  774. if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
  775. dom.wrapper.scrollTop = 0;
  776. dom.wrapper.scrollLeft = 0;
  777. }
  778. }, 1000 );
  779. }
  780. /**
  781. * Creates an HTML element and returns a reference to it.
  782. * If the element already exists the existing instance will
  783. * be returned.
  784. *
  785. * @param {HTMLElement} container
  786. * @param {string} tagname
  787. * @param {string} classname
  788. * @param {string} innerHTML
  789. *
  790. * @return {HTMLElement}
  791. */
  792. function createSingletonNode( container, tagname, classname, innerHTML ) {
  793. // Find all nodes matching the description
  794. var nodes = container.querySelectorAll( '.' + classname );
  795. // Check all matches to find one which is a direct child of
  796. // the specified container
  797. for( var i = 0; i < nodes.length; i++ ) {
  798. var testNode = nodes[i];
  799. if( testNode.parentNode === container ) {
  800. return testNode;
  801. }
  802. }
  803. // If no node was found, create it now
  804. var node = document.createElement( tagname );
  805. node.className = classname;
  806. if( typeof innerHTML === 'string' ) {
  807. node.innerHTML = innerHTML;
  808. }
  809. container.appendChild( node );
  810. return node;
  811. }
  812. /**
  813. * Creates the slide background elements and appends them
  814. * to the background container. One element is created per
  815. * slide no matter if the given slide has visible background.
  816. */
  817. function createBackgrounds() {
  818. var printMode = isPrintingPDF();
  819. // Clear prior backgrounds
  820. dom.background.innerHTML = '';
  821. dom.background.classList.add( 'no-transition' );
  822. // Iterate over all horizontal slides
  823. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  824. var backgroundStack = createBackground( slideh, dom.background );
  825. // Iterate over all vertical slides
  826. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  827. createBackground( slidev, backgroundStack );
  828. backgroundStack.classList.add( 'stack' );
  829. } );
  830. } );
  831. // Add parallax background if specified
  832. if( config.parallaxBackgroundImage ) {
  833. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  834. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  835. dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat;
  836. dom.background.style.backgroundPosition = config.parallaxBackgroundPosition;
  837. // Make sure the below properties are set on the element - these properties are
  838. // needed for proper transitions to be set on the element via CSS. To remove
  839. // annoying background slide-in effect when the presentation starts, apply
  840. // these properties after short time delay
  841. setTimeout( function() {
  842. dom.wrapper.classList.add( 'has-parallax-background' );
  843. }, 1 );
  844. }
  845. else {
  846. dom.background.style.backgroundImage = '';
  847. dom.wrapper.classList.remove( 'has-parallax-background' );
  848. }
  849. }
  850. /**
  851. * Creates a background for the given slide.
  852. *
  853. * @param {HTMLElement} slide
  854. * @param {HTMLElement} container The element that the background
  855. * should be appended to
  856. * @return {HTMLElement} New background div
  857. */
  858. function createBackground( slide, container ) {
  859. // Main slide background element
  860. var element = document.createElement( 'div' );
  861. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  862. // Inner background element that wraps images/videos/iframes
  863. var contentElement = document.createElement( 'div' );
  864. contentElement.className = 'slide-background-content';
  865. element.appendChild( contentElement );
  866. container.appendChild( element );
  867. slide.slideBackgroundElement = element;
  868. slide.slideBackgroundContentElement = contentElement;
  869. // Syncs the background to reflect all current background settings
  870. syncBackground( slide );
  871. return element;
  872. }
  873. /**
  874. * Renders all of the visual properties of a slide background
  875. * based on the various background attributes.
  876. *
  877. * @param {HTMLElement} slide
  878. */
  879. function syncBackground( slide ) {
  880. var element = slide.slideBackgroundElement,
  881. contentElement = slide.slideBackgroundContentElement;
  882. // Reset the prior background state in case this is not the
  883. // initial sync
  884. slide.classList.remove( 'has-dark-background' );
  885. slide.classList.remove( 'has-light-background' );
  886. element.removeAttribute( 'data-loaded' );
  887. element.removeAttribute( 'data-background-hash' );
  888. element.removeAttribute( 'data-background-size' );
  889. element.removeAttribute( 'data-background-transition' );
  890. element.style.backgroundColor = '';
  891. contentElement.style.backgroundSize = '';
  892. contentElement.style.backgroundRepeat = '';
  893. contentElement.style.backgroundPosition = '';
  894. contentElement.style.backgroundImage = '';
  895. contentElement.style.opacity = '';
  896. contentElement.innerHTML = '';
  897. var data = {
  898. background: slide.getAttribute( 'data-background' ),
  899. backgroundSize: slide.getAttribute( 'data-background-size' ),
  900. backgroundImage: slide.getAttribute( 'data-background-image' ),
  901. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  902. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  903. backgroundColor: slide.getAttribute( 'data-background-color' ),
  904. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  905. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  906. backgroundTransition: slide.getAttribute( 'data-background-transition' ),
  907. backgroundOpacity: slide.getAttribute( 'data-background-opacity' )
  908. };
  909. if( data.background ) {
  910. // Auto-wrap image urls in url(...)
  911. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) {
  912. slide.setAttribute( 'data-background-image', data.background );
  913. }
  914. else {
  915. element.style.background = data.background;
  916. }
  917. }
  918. // Create a hash for this combination of background settings.
  919. // This is used to determine when two slide backgrounds are
  920. // the same.
  921. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  922. element.setAttribute( 'data-background-hash', data.background +
  923. data.backgroundSize +
  924. data.backgroundImage +
  925. data.backgroundVideo +
  926. data.backgroundIframe +
  927. data.backgroundColor +
  928. data.backgroundRepeat +
  929. data.backgroundPosition +
  930. data.backgroundTransition +
  931. data.backgroundOpacity );
  932. }
  933. // Additional and optional background properties
  934. if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );
  935. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  936. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  937. // Background image options are set on the content wrapper
  938. if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
  939. if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;
  940. if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;
  941. if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;
  942. // If this slide has a background color, we add a class that
  943. // signals if it is light or dark. If the slide has no background
  944. // color, no class will be added
  945. var contrastColor = data.backgroundColor;
  946. // If no bg color was found, check the computed background
  947. if( !contrastColor ) {
  948. var computedBackgroundStyle = window.getComputedStyle( element );
  949. if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
  950. contrastColor = computedBackgroundStyle.backgroundColor;
  951. }
  952. }
  953. if( contrastColor ) {
  954. var rgb = colorToRgb( contrastColor );
  955. // Ignore fully transparent backgrounds. Some browsers return
  956. // rgba(0,0,0,0) when reading the computed background color of
  957. // an element with no background
  958. if( rgb && rgb.a !== 0 ) {
  959. if( colorBrightness( contrastColor ) < 128 ) {
  960. slide.classList.add( 'has-dark-background' );
  961. }
  962. else {
  963. slide.classList.add( 'has-light-background' );
  964. }
  965. }
  966. }
  967. }
  968. /**
  969. * Registers a listener to postMessage events, this makes it
  970. * possible to call all reveal.js API methods from another
  971. * window. For example:
  972. *
  973. * revealWindow.postMessage( JSON.stringify({
  974. * method: 'slide',
  975. * args: [ 2 ]
  976. * }), '*' );
  977. */
  978. function setupPostMessage() {
  979. if( config.postMessage ) {
  980. window.addEventListener( 'message', function ( event ) {
  981. var data = event.data;
  982. // Make sure we're dealing with JSON
  983. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  984. data = JSON.parse( data );
  985. // Check if the requested method can be found
  986. if( data.method && typeof Reveal[data.method] === 'function' ) {
  987. Reveal[data.method].apply( Reveal, data.args );
  988. }
  989. }
  990. }, false );
  991. }
  992. }
  993. /**
  994. * Applies the configuration settings from the config
  995. * object. May be called multiple times.
  996. *
  997. * @param {object} options
  998. */
  999. function configure( options ) {
  1000. var oldTransition = config.transition;
  1001. // New config options may be passed when this method
  1002. // is invoked through the API after initialization
  1003. if( typeof options === 'object' ) extend( config, options );
  1004. // Abort if reveal.js hasn't finished loading, config
  1005. // changes will be applied automatically once loading
  1006. // finishes
  1007. if( loaded === false ) return;
  1008. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  1009. // Remove the previously configured transition class
  1010. dom.wrapper.classList.remove( oldTransition );
  1011. // Force linear transition based on browser capabilities
  1012. if( features.transforms3d === false ) config.transition = 'linear';
  1013. dom.wrapper.classList.add( config.transition );
  1014. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  1015. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  1016. dom.controls.style.display = config.controls ? 'block' : 'none';
  1017. dom.progress.style.display = config.progress ? 'block' : 'none';
  1018. dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout );
  1019. dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
  1020. if( config.shuffle ) {
  1021. shuffle();
  1022. }
  1023. if( config.rtl ) {
  1024. dom.wrapper.classList.add( 'rtl' );
  1025. }
  1026. else {
  1027. dom.wrapper.classList.remove( 'rtl' );
  1028. }
  1029. if( config.center ) {
  1030. dom.wrapper.classList.add( 'center' );
  1031. }
  1032. else {
  1033. dom.wrapper.classList.remove( 'center' );
  1034. }
  1035. // Exit the paused mode if it was configured off
  1036. if( config.pause === false ) {
  1037. resume();
  1038. }
  1039. if( config.showNotes ) {
  1040. dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
  1041. }
  1042. if( config.mouseWheel ) {
  1043. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1044. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1045. }
  1046. else {
  1047. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1048. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1049. }
  1050. // Rolling 3D links
  1051. if( config.rollingLinks ) {
  1052. enableRollingLinks();
  1053. }
  1054. else {
  1055. disableRollingLinks();
  1056. }
  1057. // Auto-hide the mouse pointer when its inactive
  1058. if( config.hideInactiveCursor ) {
  1059. document.addEventListener( 'mousemove', onDocumentCursorActive, false );
  1060. document.addEventListener( 'mousedown', onDocumentCursorActive, false );
  1061. }
  1062. else {
  1063. showCursor();
  1064. document.removeEventListener( 'mousemove', onDocumentCursorActive, false );
  1065. document.removeEventListener( 'mousedown', onDocumentCursorActive, false );
  1066. }
  1067. // Iframe link previews
  1068. if( config.previewLinks ) {
  1069. enablePreviewLinks();
  1070. disablePreviewLinks( '[data-preview-link=false]' );
  1071. }
  1072. else {
  1073. disablePreviewLinks();
  1074. enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
  1075. }
  1076. // Remove existing auto-slide controls
  1077. if( autoSlidePlayer ) {
  1078. autoSlidePlayer.destroy();
  1079. autoSlidePlayer = null;
  1080. }
  1081. // Generate auto-slide controls if needed
  1082. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  1083. autoSlidePlayer = new Playback( dom.wrapper, function() {
  1084. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  1085. } );
  1086. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  1087. autoSlidePaused = false;
  1088. }
  1089. // When fragments are turned off they should be visible
  1090. if( config.fragments === false ) {
  1091. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  1092. element.classList.add( 'visible' );
  1093. element.classList.remove( 'current-fragment' );
  1094. } );
  1095. }
  1096. // Slide numbers
  1097. var slideNumberDisplay = 'none';
  1098. if( config.slideNumber && !isPrintingPDF() ) {
  1099. if( config.showSlideNumber === 'all' ) {
  1100. slideNumberDisplay = 'block';
  1101. }
  1102. else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) {
  1103. slideNumberDisplay = 'block';
  1104. }
  1105. }
  1106. dom.slideNumber.style.display = slideNumberDisplay;
  1107. // Add the navigation mode to the DOM so we can adjust styling
  1108. if( config.navigationMode !== 'default' ) {
  1109. dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );
  1110. }
  1111. else {
  1112. dom.wrapper.removeAttribute( 'data-navigation-mode' );
  1113. }
  1114. // Define our contextual list of keyboard shortcuts
  1115. if( config.navigationMode === 'linear' ) {
  1116. keyboardShortcuts['&#8594; , &#8595; , SPACE , N , L , J'] = 'Next slide';
  1117. keyboardShortcuts['&#8592; , &#8593; , P , H , K'] = 'Previous slide';
  1118. }
  1119. else {
  1120. keyboardShortcuts['N , SPACE'] = 'Next slide';
  1121. keyboardShortcuts['P'] = 'Previous slide';
  1122. keyboardShortcuts['&#8592; , H'] = 'Navigate left';
  1123. keyboardShortcuts['&#8594; , L'] = 'Navigate right';
  1124. keyboardShortcuts['&#8593; , K'] = 'Navigate up';
  1125. keyboardShortcuts['&#8595; , J'] = 'Navigate down';
  1126. }
  1127. keyboardShortcuts['Home , &#8984;/CTRL &#8592;'] = 'First slide';
  1128. keyboardShortcuts['End , &#8984;/CTRL &#8594;'] = 'Last slide';
  1129. keyboardShortcuts['B , .'] = 'Pause';
  1130. keyboardShortcuts['F'] = 'Fullscreen';
  1131. keyboardShortcuts['ESC, O'] = 'Slide overview';
  1132. sync();
  1133. }
  1134. /**
  1135. * Binds all event listeners.
  1136. */
  1137. function addEventListeners() {
  1138. eventsAreBound = true;
  1139. window.addEventListener( 'hashchange', onWindowHashChange, false );
  1140. window.addEventListener( 'resize', onWindowResize, false );
  1141. if( config.touch ) {
  1142. if( 'onpointerdown' in window ) {
  1143. // Use W3C pointer events
  1144. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  1145. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  1146. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  1147. }
  1148. else if( window.navigator.msPointerEnabled ) {
  1149. // IE 10 uses prefixed version of pointer events
  1150. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  1151. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  1152. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  1153. }
  1154. else {
  1155. // Fall back to touch events
  1156. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  1157. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  1158. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  1159. }
  1160. }
  1161. if( config.keyboard ) {
  1162. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  1163. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  1164. }
  1165. if( config.progress && dom.progress ) {
  1166. dom.progress.addEventListener( 'click', onProgressClicked, false );
  1167. }
  1168. dom.pauseOverlay.addEventListener( 'click', resume, false );
  1169. if( config.focusBodyOnPageVisibilityChange ) {
  1170. var visibilityChange;
  1171. if( 'hidden' in document ) {
  1172. visibilityChange = 'visibilitychange';
  1173. }
  1174. else if( 'msHidden' in document ) {
  1175. visibilityChange = 'msvisibilitychange';
  1176. }
  1177. else if( 'webkitHidden' in document ) {
  1178. visibilityChange = 'webkitvisibilitychange';
  1179. }
  1180. if( visibilityChange ) {
  1181. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  1182. }
  1183. }
  1184. // Listen to both touch and click events, in case the device
  1185. // supports both
  1186. var pointerEvents = [ 'touchstart', 'click' ];
  1187. // Only support touch for Android, fixes double navigations in
  1188. // stock browser
  1189. if( UA.match( /android/gi ) ) {
  1190. pointerEvents = [ 'touchstart' ];
  1191. }
  1192. pointerEvents.forEach( function( eventName ) {
  1193. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  1194. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  1195. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  1196. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  1197. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  1198. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  1199. } );
  1200. }
  1201. /**
  1202. * Unbinds all event listeners.
  1203. */
  1204. function removeEventListeners() {
  1205. eventsAreBound = false;
  1206. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  1207. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  1208. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  1209. window.removeEventListener( 'resize', onWindowResize, false );
  1210. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  1211. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  1212. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  1213. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  1214. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  1215. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  1216. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  1217. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  1218. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  1219. dom.pauseOverlay.removeEventListener( 'click', resume, false );
  1220. if ( config.progress && dom.progress ) {
  1221. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  1222. }
  1223. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  1224. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  1225. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  1226. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  1227. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  1228. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  1229. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  1230. } );
  1231. }
  1232. /**
  1233. * Registers a new plugin with this reveal.js instance.
  1234. *
  1235. * reveal.js waits for all regisered plugins to initialize
  1236. * before considering itself ready, as long as the plugin
  1237. * is registered before calling `Reveal.initialize()`.
  1238. */
  1239. function registerPlugin( id, plugin ) {
  1240. if( plugins[id] === undefined ) {
  1241. plugins[id] = plugin;
  1242. // If a plugin is registered after reveal.js is loaded,
  1243. // initialize it right away
  1244. if( loaded && typeof plugin.init === 'function' ) {
  1245. plugin.init();
  1246. }
  1247. }
  1248. else {
  1249. console.warn( 'reveal.js: "'+ id +'" plugin has already been registered' );
  1250. }
  1251. }
  1252. /**
  1253. * Checks if a specific plugin has been registered.
  1254. *
  1255. * @param {String} id Unique plugin identifier
  1256. */
  1257. function hasPlugin( id ) {
  1258. return !!plugins[id];
  1259. }
  1260. /**
  1261. * Returns the specific plugin instance, if a plugin
  1262. * with the given ID has been registered.
  1263. *
  1264. * @param {String} id Unique plugin identifier
  1265. */
  1266. function getPlugin( id ) {
  1267. return plugins[id];
  1268. }
  1269. /**
  1270. * Add a custom key binding with optional description to
  1271. * be added to the help screen.
  1272. */
  1273. function addKeyBinding( binding, callback ) {
  1274. if( typeof binding === 'object' && binding.keyCode ) {
  1275. registeredKeyBindings[binding.keyCode] = {
  1276. callback: callback,
  1277. key: binding.key,
  1278. description: binding.description
  1279. };
  1280. }
  1281. else {
  1282. registeredKeyBindings[binding] = {
  1283. callback: callback,
  1284. key: null,
  1285. description: null
  1286. };
  1287. }
  1288. }
  1289. /**
  1290. * Removes the specified custom key binding.
  1291. */
  1292. function removeKeyBinding( keyCode ) {
  1293. delete registeredKeyBindings[keyCode];
  1294. }
  1295. /**
  1296. * Extend object a with the properties of object b.
  1297. * If there's a conflict, object b takes precedence.
  1298. *
  1299. * @param {object} a
  1300. * @param {object} b
  1301. */
  1302. function extend( a, b ) {
  1303. for( var i in b ) {
  1304. a[ i ] = b[ i ];
  1305. }
  1306. return a;
  1307. }
  1308. /**
  1309. * Converts the target object to an array.
  1310. *
  1311. * @param {object} o
  1312. * @return {object[]}
  1313. */
  1314. function toArray( o ) {
  1315. return Array.prototype.slice.call( o );
  1316. }
  1317. /**
  1318. * Utility for deserializing a value.
  1319. *
  1320. * @param {*} value
  1321. * @return {*}
  1322. */
  1323. function deserialize( value ) {
  1324. if( typeof value === 'string' ) {
  1325. if( value === 'null' ) return null;
  1326. else if( value === 'true' ) return true;
  1327. else if( value === 'false' ) return false;
  1328. else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
  1329. }
  1330. return value;
  1331. }
  1332. /**
  1333. * Measures the distance in pixels between point a
  1334. * and point b.
  1335. *
  1336. * @param {object} a point with x/y properties
  1337. * @param {object} b point with x/y properties
  1338. *
  1339. * @return {number}
  1340. */
  1341. function distanceBetween( a, b ) {
  1342. var dx = a.x - b.x,
  1343. dy = a.y - b.y;
  1344. return Math.sqrt( dx*dx + dy*dy );
  1345. }
  1346. /**
  1347. * Applies a CSS transform to the target element.
  1348. *
  1349. * @param {HTMLElement} element
  1350. * @param {string} transform
  1351. */
  1352. function transformElement( element, transform ) {
  1353. element.style.WebkitTransform = transform;
  1354. element.style.MozTransform = transform;
  1355. element.style.msTransform = transform;
  1356. element.style.transform = transform;
  1357. }
  1358. /**
  1359. * Applies CSS transforms to the slides container. The container
  1360. * is transformed from two separate sources: layout and the overview
  1361. * mode.
  1362. *
  1363. * @param {object} transforms
  1364. */
  1365. function transformSlides( transforms ) {
  1366. // Pick up new transforms from arguments
  1367. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  1368. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  1369. // Apply the transforms to the slides container
  1370. if( slidesTransform.layout ) {
  1371. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  1372. }
  1373. else {
  1374. transformElement( dom.slides, slidesTransform.overview );
  1375. }
  1376. }
  1377. /**
  1378. * Injects the given CSS styles into the DOM.
  1379. *
  1380. * @param {string} value
  1381. */
  1382. function injectStyleSheet( value ) {
  1383. var tag = document.createElement( 'style' );
  1384. tag.type = 'text/css';
  1385. if( tag.styleSheet ) {
  1386. tag.styleSheet.cssText = value;
  1387. }
  1388. else {
  1389. tag.appendChild( document.createTextNode( value ) );
  1390. }
  1391. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  1392. }
  1393. /**
  1394. * Find the closest parent that matches the given
  1395. * selector.
  1396. *
  1397. * @param {HTMLElement} target The child element
  1398. * @param {String} selector The CSS selector to match
  1399. * the parents against
  1400. *
  1401. * @return {HTMLElement} The matched parent or null
  1402. * if no matching parent was found
  1403. */
  1404. function closestParent( target, selector ) {
  1405. var parent = target.parentNode;
  1406. while( parent ) {
  1407. // There's some overhead doing this each time, we don't
  1408. // want to rewrite the element prototype but should still
  1409. // be enough to feature detect once at startup...
  1410. var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
  1411. // If we find a match, we're all set
  1412. if( matchesMethod && matchesMethod.call( parent, selector ) ) {
  1413. return parent;
  1414. }
  1415. // Keep searching
  1416. parent = parent.parentNode;
  1417. }
  1418. return null;
  1419. }
  1420. /**
  1421. * Converts various color input formats to an {r:0,g:0,b:0} object.
  1422. *
  1423. * @param {string} color The string representation of a color
  1424. * @example
  1425. * colorToRgb('#000');
  1426. * @example
  1427. * colorToRgb('#000000');
  1428. * @example
  1429. * colorToRgb('rgb(0,0,0)');
  1430. * @example
  1431. * colorToRgb('rgba(0,0,0)');
  1432. *
  1433. * @return {{r: number, g: number, b: number, [a]: number}|null}
  1434. */
  1435. function colorToRgb( color ) {
  1436. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  1437. if( hex3 && hex3[1] ) {
  1438. hex3 = hex3[1];
  1439. return {
  1440. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  1441. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  1442. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  1443. };
  1444. }
  1445. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  1446. if( hex6 && hex6[1] ) {
  1447. hex6 = hex6[1];
  1448. return {
  1449. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  1450. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  1451. b: parseInt( hex6.substr( 4, 2 ), 16 )
  1452. };
  1453. }
  1454. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  1455. if( rgb ) {
  1456. return {
  1457. r: parseInt( rgb[1], 10 ),
  1458. g: parseInt( rgb[2], 10 ),
  1459. b: parseInt( rgb[3], 10 )
  1460. };
  1461. }
  1462. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  1463. if( rgba ) {
  1464. return {
  1465. r: parseInt( rgba[1], 10 ),
  1466. g: parseInt( rgba[2], 10 ),
  1467. b: parseInt( rgba[3], 10 ),
  1468. a: parseFloat( rgba[4] )
  1469. };
  1470. }
  1471. return null;
  1472. }
  1473. /**
  1474. * Calculates brightness on a scale of 0-255.
  1475. *
  1476. * @param {string} color See colorToRgb for supported formats.
  1477. * @see {@link colorToRgb}
  1478. */
  1479. function colorBrightness( color ) {
  1480. if( typeof color === 'string' ) color = colorToRgb( color );
  1481. if( color ) {
  1482. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  1483. }
  1484. return null;
  1485. }
  1486. /**
  1487. * Returns the remaining height within the parent of the
  1488. * target element.
  1489. *
  1490. * remaining height = [ configured parent height ] - [ current parent height ]
  1491. *
  1492. * @param {HTMLElement} element
  1493. * @param {number} [height]
  1494. */
  1495. function getRemainingHeight( element, height ) {
  1496. height = height || 0;
  1497. if( element ) {
  1498. var newHeight, oldHeight = element.style.height;
  1499. // Change the .stretch element height to 0 in order find the height of all
  1500. // the other elements
  1501. element.style.height = '0px';
  1502. // In Overview mode, the parent (.slide) height is set of 700px.
  1503. // Restore it temporarily to its natural height.
  1504. element.parentNode.style.height = 'auto';
  1505. newHeight = height - element.parentNode.offsetHeight;
  1506. // Restore the old height, just in case
  1507. element.style.height = oldHeight + 'px';
  1508. // Clear the parent (.slide) height. .removeProperty works in IE9+
  1509. element.parentNode.style.removeProperty('height');
  1510. return newHeight;
  1511. }
  1512. return height;
  1513. }
  1514. /**
  1515. * Checks if this instance is being used to print a PDF.
  1516. */
  1517. function isPrintingPDF() {
  1518. return ( /print-pdf/gi ).test( window.location.search );
  1519. }
  1520. /**
  1521. * Hides the address bar if we're on a mobile device.
  1522. */
  1523. function hideAddressBar() {
  1524. if( config.hideAddressBar && isMobileDevice ) {
  1525. // Events that should trigger the address bar to hide
  1526. window.addEventListener( 'load', removeAddressBar, false );
  1527. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1528. }
  1529. }
  1530. /**
  1531. * Causes the address bar to hide on mobile devices,
  1532. * more vertical space ftw.
  1533. */
  1534. function removeAddressBar() {
  1535. setTimeout( function() {
  1536. window.scrollTo( 0, 1 );
  1537. }, 10 );
  1538. }
  1539. /**
  1540. * Dispatches an event of the specified type from the
  1541. * reveal DOM element.
  1542. */
  1543. function dispatchEvent( type, args ) {
  1544. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1545. event.initEvent( type, true, true );
  1546. extend( event, args );
  1547. dom.wrapper.dispatchEvent( event );
  1548. // If we're in an iframe, post each reveal.js event to the
  1549. // parent window. Used by the notes plugin
  1550. if( config.postMessageEvents && window.parent !== window.self ) {
  1551. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  1552. }
  1553. }
  1554. /**
  1555. * Wrap all links in 3D goodness.
  1556. */
  1557. function enableRollingLinks() {
  1558. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1559. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1560. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1561. var anchor = anchors[i];
  1562. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1563. var span = document.createElement('span');
  1564. span.setAttribute('data-title', anchor.text);
  1565. span.innerHTML = anchor.innerHTML;
  1566. anchor.classList.add( 'roll' );
  1567. anchor.innerHTML = '';
  1568. anchor.appendChild(span);
  1569. }
  1570. }
  1571. }
  1572. }
  1573. /**
  1574. * Unwrap all 3D links.
  1575. */
  1576. function disableRollingLinks() {
  1577. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1578. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1579. var anchor = anchors[i];
  1580. var span = anchor.querySelector( 'span' );
  1581. if( span ) {
  1582. anchor.classList.remove( 'roll' );
  1583. anchor.innerHTML = span.innerHTML;
  1584. }
  1585. }
  1586. }
  1587. /**
  1588. * Bind preview frame links.
  1589. *
  1590. * @param {string} [selector=a] - selector for anchors
  1591. */
  1592. function enablePreviewLinks( selector ) {
  1593. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1594. anchors.forEach( function( element ) {
  1595. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1596. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1597. }
  1598. } );
  1599. }
  1600. /**
  1601. * Unbind preview frame links.
  1602. */
  1603. function disablePreviewLinks( selector ) {
  1604. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1605. anchors.forEach( function( element ) {
  1606. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1607. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1608. }
  1609. } );
  1610. }
  1611. /**
  1612. * Opens a preview window for the target URL.
  1613. *
  1614. * @param {string} url - url for preview iframe src
  1615. */
  1616. function showPreview( url ) {
  1617. closeOverlay();
  1618. dom.overlay = document.createElement( 'div' );
  1619. dom.overlay.classList.add( 'overlay' );
  1620. dom.overlay.classList.add( 'overlay-preview' );
  1621. dom.wrapper.appendChild( dom.overlay );
  1622. dom.overlay.innerHTML = [
  1623. '<header>',
  1624. '<a class="close" href="#"><span class="icon"></span></a>',
  1625. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1626. '</header>',
  1627. '<div class="spinner"></div>',
  1628. '<div class="viewport">',
  1629. '<iframe src="'+ url +'"></iframe>',
  1630. '<small class="viewport-inner">',
  1631. '<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>',
  1632. '</small>',
  1633. '</div>'
  1634. ].join('');
  1635. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1636. dom.overlay.classList.add( 'loaded' );
  1637. }, false );
  1638. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1639. closeOverlay();
  1640. event.preventDefault();
  1641. }, false );
  1642. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1643. closeOverlay();
  1644. }, false );
  1645. setTimeout( function() {
  1646. dom.overlay.classList.add( 'visible' );
  1647. }, 1 );
  1648. }
  1649. /**
  1650. * Open or close help overlay window.
  1651. *
  1652. * @param {Boolean} [override] Flag which overrides the
  1653. * toggle logic and forcibly sets the desired state. True means
  1654. * help is open, false means it's closed.
  1655. */
  1656. function toggleHelp( override ){
  1657. if( typeof override === 'boolean' ) {
  1658. override ? showHelp() : closeOverlay();
  1659. }
  1660. else {
  1661. if( dom.overlay ) {
  1662. closeOverlay();
  1663. }
  1664. else {
  1665. showHelp();
  1666. }
  1667. }
  1668. }
  1669. /**
  1670. * Opens an overlay window with help material.
  1671. */
  1672. function showHelp() {
  1673. if( config.help ) {
  1674. closeOverlay();
  1675. dom.overlay = document.createElement( 'div' );
  1676. dom.overlay.classList.add( 'overlay' );
  1677. dom.overlay.classList.add( 'overlay-help' );
  1678. dom.wrapper.appendChild( dom.overlay );
  1679. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1680. html += '<table><th>KEY</th><th>ACTION</th>';
  1681. for( var key in keyboardShortcuts ) {
  1682. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1683. }
  1684. // Add custom key bindings that have associated descriptions
  1685. for( var binding in registeredKeyBindings ) {
  1686. if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) {
  1687. html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</td></tr>';
  1688. }
  1689. }
  1690. html += '</table>';
  1691. dom.overlay.innerHTML = [
  1692. '<header>',
  1693. '<a class="close" href="#"><span class="icon"></span></a>',
  1694. '</header>',
  1695. '<div class="viewport">',
  1696. '<div class="viewport-inner">'+ html +'</div>',
  1697. '</div>'
  1698. ].join('');
  1699. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1700. closeOverlay();
  1701. event.preventDefault();
  1702. }, false );
  1703. setTimeout( function() {
  1704. dom.overlay.classList.add( 'visible' );
  1705. }, 1 );
  1706. }
  1707. }
  1708. /**
  1709. * Closes any currently open overlay.
  1710. */
  1711. function closeOverlay() {
  1712. if( dom.overlay ) {
  1713. dom.overlay.parentNode.removeChild( dom.overlay );
  1714. dom.overlay = null;
  1715. }
  1716. }
  1717. /**
  1718. * Applies JavaScript-controlled layout rules to the
  1719. * presentation.
  1720. */
  1721. function layout() {
  1722. if( dom.wrapper && !isPrintingPDF() ) {
  1723. if( !config.disableLayout ) {
  1724. // On some mobile devices '100vh' is taller than the visible
  1725. // viewport which leads to part of the presentation being
  1726. // cut off. To work around this we define our own '--vh' custom
  1727. // property where 100x adds up to the correct height.
  1728. //
  1729. // https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
  1730. if( isMobileDevice ) {
  1731. document.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );
  1732. }
  1733. var size = getComputedSlideSize();
  1734. var oldScale = scale;
  1735. // Layout the contents of the slides
  1736. layoutSlideContents( config.width, config.height );
  1737. dom.slides.style.width = size.width + 'px';
  1738. dom.slides.style.height = size.height + 'px';
  1739. // Determine scale of content to fit within available space
  1740. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1741. // Respect max/min scale settings
  1742. scale = Math.max( scale, config.minScale );
  1743. scale = Math.min( scale, config.maxScale );
  1744. // Don't apply any scaling styles if scale is 1
  1745. if( scale === 1 ) {
  1746. dom.slides.style.zoom = '';
  1747. dom.slides.style.left = '';
  1748. dom.slides.style.top = '';
  1749. dom.slides.style.bottom = '';
  1750. dom.slides.style.right = '';
  1751. transformSlides( { layout: '' } );
  1752. }
  1753. else {
  1754. // Prefer zoom for scaling up so that content remains crisp.
  1755. // Don't use zoom to scale down since that can lead to shifts
  1756. // in text layout/line breaks.
  1757. if( scale > 1 && features.zoom ) {
  1758. dom.slides.style.zoom = scale;
  1759. dom.slides.style.left = '';
  1760. dom.slides.style.top = '';
  1761. dom.slides.style.bottom = '';
  1762. dom.slides.style.right = '';
  1763. transformSlides( { layout: '' } );
  1764. }
  1765. // Apply scale transform as a fallback
  1766. else {
  1767. dom.slides.style.zoom = '';
  1768. dom.slides.style.left = '50%';
  1769. dom.slides.style.top = '50%';
  1770. dom.slides.style.bottom = 'auto';
  1771. dom.slides.style.right = 'auto';
  1772. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1773. }
  1774. }
  1775. // Select all slides, vertical and horizontal
  1776. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1777. for( var i = 0, len = slides.length; i < len; i++ ) {
  1778. var slide = slides[ i ];
  1779. // Don't bother updating invisible slides
  1780. if( slide.style.display === 'none' ) {
  1781. continue;
  1782. }
  1783. if( config.center || slide.classList.contains( 'center' ) ) {
  1784. // Vertical stacks are not centred since their section
  1785. // children will be
  1786. if( slide.classList.contains( 'stack' ) ) {
  1787. slide.style.top = 0;
  1788. }
  1789. else {
  1790. slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
  1791. }
  1792. }
  1793. else {
  1794. slide.style.top = '';
  1795. }
  1796. }
  1797. if( oldScale !== scale ) {
  1798. dispatchEvent( 'resize', {
  1799. 'oldScale': oldScale,
  1800. 'scale': scale,
  1801. 'size': size
  1802. } );
  1803. }
  1804. }
  1805. updateProgress();
  1806. updateParallax();
  1807. if( isOverview() ) {
  1808. updateOverview();
  1809. }
  1810. }
  1811. }
  1812. /**
  1813. * Applies layout logic to the contents of all slides in
  1814. * the presentation.
  1815. *
  1816. * @param {string|number} width
  1817. * @param {string|number} height
  1818. */
  1819. function layoutSlideContents( width, height ) {
  1820. // Handle sizing of elements with the 'stretch' class
  1821. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1822. // Determine how much vertical space we can use
  1823. var remainingHeight = getRemainingHeight( element, height );
  1824. // Consider the aspect ratio of media elements
  1825. if( /(img|video)/gi.test( element.nodeName ) ) {
  1826. var nw = element.naturalWidth || element.videoWidth,
  1827. nh = element.naturalHeight || element.videoHeight;
  1828. var es = Math.min( width / nw, remainingHeight / nh );
  1829. element.style.width = ( nw * es ) + 'px';
  1830. element.style.height = ( nh * es ) + 'px';
  1831. }
  1832. else {
  1833. element.style.width = width + 'px';
  1834. element.style.height = remainingHeight + 'px';
  1835. }
  1836. } );
  1837. }
  1838. /**
  1839. * Calculates the computed pixel size of our slides. These
  1840. * values are based on the width and height configuration
  1841. * options.
  1842. *
  1843. * @param {number} [presentationWidth=dom.wrapper.offsetWidth]
  1844. * @param {number} [presentationHeight=dom.wrapper.offsetHeight]
  1845. */
  1846. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1847. var size = {
  1848. // Slide size
  1849. width: config.width,
  1850. height: config.height,
  1851. // Presentation size
  1852. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1853. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1854. };
  1855. // Reduce available space by margin
  1856. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1857. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1858. // Slide width may be a percentage of available width
  1859. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1860. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1861. }
  1862. // Slide height may be a percentage of available height
  1863. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1864. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1865. }
  1866. return size;
  1867. }
  1868. /**
  1869. * Stores the vertical index of a stack so that the same
  1870. * vertical slide can be selected when navigating to and
  1871. * from the stack.
  1872. *
  1873. * @param {HTMLElement} stack The vertical stack element
  1874. * @param {string|number} [v=0] Index to memorize
  1875. */
  1876. function setPreviousVerticalIndex( stack, v ) {
  1877. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1878. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1879. }
  1880. }
  1881. /**
  1882. * Retrieves the vertical index which was stored using
  1883. * #setPreviousVerticalIndex() or 0 if no previous index
  1884. * exists.
  1885. *
  1886. * @param {HTMLElement} stack The vertical stack element
  1887. */
  1888. function getPreviousVerticalIndex( stack ) {
  1889. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1890. // Prefer manually defined start-indexv
  1891. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1892. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1893. }
  1894. return 0;
  1895. }
  1896. /**
  1897. * Displays the overview of slides (quick nav) by scaling
  1898. * down and arranging all slide elements.
  1899. */
  1900. function activateOverview() {
  1901. // Only proceed if enabled in config
  1902. if( config.overview && !isOverview() ) {
  1903. overview = true;
  1904. dom.wrapper.classList.add( 'overview' );
  1905. dom.wrapper.classList.remove( 'overview-deactivating' );
  1906. if( features.overviewTransitions ) {
  1907. setTimeout( function() {
  1908. dom.wrapper.classList.add( 'overview-animated' );
  1909. }, 1 );
  1910. }
  1911. // Don't auto-slide while in overview mode
  1912. cancelAutoSlide();
  1913. // Move the backgrounds element into the slide container to
  1914. // that the same scaling is applied
  1915. dom.slides.appendChild( dom.background );
  1916. // Clicking on an overview slide navigates to it
  1917. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1918. if( !slide.classList.contains( 'stack' ) ) {
  1919. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1920. }
  1921. } );
  1922. // Calculate slide sizes
  1923. var margin = 70;
  1924. var slideSize = getComputedSlideSize();
  1925. overviewSlideWidth = slideSize.width + margin;
  1926. overviewSlideHeight = slideSize.height + margin;
  1927. // Reverse in RTL mode
  1928. if( config.rtl ) {
  1929. overviewSlideWidth = -overviewSlideWidth;
  1930. }
  1931. updateSlidesVisibility();
  1932. layoutOverview();
  1933. updateOverview();
  1934. layout();
  1935. // Notify observers of the overview showing
  1936. dispatchEvent( 'overviewshown', {
  1937. 'indexh': indexh,
  1938. 'indexv': indexv,
  1939. 'currentSlide': currentSlide
  1940. } );
  1941. }
  1942. }
  1943. /**
  1944. * Uses CSS transforms to position all slides in a grid for
  1945. * display inside of the overview mode.
  1946. */
  1947. function layoutOverview() {
  1948. // Layout slides
  1949. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1950. hslide.setAttribute( 'data-index-h', h );
  1951. transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1952. if( hslide.classList.contains( 'stack' ) ) {
  1953. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1954. vslide.setAttribute( 'data-index-h', h );
  1955. vslide.setAttribute( 'data-index-v', v );
  1956. transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1957. } );
  1958. }
  1959. } );
  1960. // Layout slide backgrounds
  1961. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1962. transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1963. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1964. transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1965. } );
  1966. } );
  1967. }
  1968. /**
  1969. * Moves the overview viewport to the current slides.
  1970. * Called each time the current slide changes.
  1971. */
  1972. function updateOverview() {
  1973. var vmin = Math.min( window.innerWidth, window.innerHeight );
  1974. var scale = Math.max( vmin / 5, 150 ) / vmin;
  1975. transformSlides( {
  1976. overview: [
  1977. 'scale('+ scale +')',
  1978. 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
  1979. 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)'
  1980. ].join( ' ' )
  1981. } );
  1982. }
  1983. /**
  1984. * Exits the slide overview and enters the currently
  1985. * active slide.
  1986. */
  1987. function deactivateOverview() {
  1988. // Only proceed if enabled in config
  1989. if( config.overview ) {
  1990. overview = false;
  1991. dom.wrapper.classList.remove( 'overview' );
  1992. dom.wrapper.classList.remove( 'overview-animated' );
  1993. // Temporarily add a class so that transitions can do different things
  1994. // depending on whether they are exiting/entering overview, or just
  1995. // moving from slide to slide
  1996. dom.wrapper.classList.add( 'overview-deactivating' );
  1997. setTimeout( function () {
  1998. dom.wrapper.classList.remove( 'overview-deactivating' );
  1999. }, 1 );
  2000. // Move the background element back out
  2001. dom.wrapper.appendChild( dom.background );
  2002. // Clean up changes made to slides
  2003. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  2004. transformElement( slide, '' );
  2005. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  2006. } );
  2007. // Clean up changes made to backgrounds
  2008. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  2009. transformElement( background, '' );
  2010. } );
  2011. transformSlides( { overview: '' } );
  2012. slide( indexh, indexv );
  2013. layout();
  2014. cueAutoSlide();
  2015. // Notify observers of the overview hiding
  2016. dispatchEvent( 'overviewhidden', {
  2017. 'indexh': indexh,
  2018. 'indexv': indexv,
  2019. 'currentSlide': currentSlide
  2020. } );
  2021. }
  2022. }
  2023. /**
  2024. * Toggles the slide overview mode on and off.
  2025. *
  2026. * @param {Boolean} [override] Flag which overrides the
  2027. * toggle logic and forcibly sets the desired state. True means
  2028. * overview is open, false means it's closed.
  2029. */
  2030. function toggleOverview( override ) {
  2031. if( typeof override === 'boolean' ) {
  2032. override ? activateOverview() : deactivateOverview();
  2033. }
  2034. else {
  2035. isOverview() ? deactivateOverview() : activateOverview();
  2036. }
  2037. }
  2038. /**
  2039. * Checks if the overview is currently active.
  2040. *
  2041. * @return {Boolean} true if the overview is active,
  2042. * false otherwise
  2043. */
  2044. function isOverview() {
  2045. return overview;
  2046. }
  2047. /**
  2048. * Return a hash URL that will resolve to the current slide location.
  2049. */
  2050. function locationHash() {
  2051. var url = '/';
  2052. // Attempt to create a named link based on the slide's ID
  2053. var id = currentSlide ? currentSlide.getAttribute( 'id' ) : null;
  2054. if( id ) {
  2055. id = encodeURIComponent( id );
  2056. }
  2057. var indexf;
  2058. if( config.fragmentInURL ) {
  2059. indexf = getIndices().f;
  2060. }
  2061. // If the current slide has an ID, use that as a named link,
  2062. // but we don't support named links with a fragment index
  2063. if( typeof id === 'string' && id.length && indexf === undefined ) {
  2064. url = '/' + id;
  2065. }
  2066. // Otherwise use the /h/v index
  2067. else {
  2068. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  2069. if( indexh > 0 || indexv > 0 || indexf !== undefined ) url += indexh + hashIndexBase;
  2070. if( indexv > 0 || indexf !== undefined ) url += '/' + (indexv + hashIndexBase );
  2071. if( indexf !== undefined ) url += '/' + indexf;
  2072. }
  2073. return url;
  2074. }
  2075. /**
  2076. * Checks if the current or specified slide is vertical
  2077. * (nested within another slide).
  2078. *
  2079. * @param {HTMLElement} [slide=currentSlide] The slide to check
  2080. * orientation of
  2081. * @return {Boolean}
  2082. */
  2083. function isVerticalSlide( slide ) {
  2084. // Prefer slide argument, otherwise use current slide
  2085. slide = slide ? slide : currentSlide;
  2086. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  2087. }
  2088. /**
  2089. * Handling the fullscreen functionality via the fullscreen API
  2090. *
  2091. * @see http://fullscreen.spec.whatwg.org/
  2092. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  2093. */
  2094. function enterFullscreen() {
  2095. var element = document.documentElement;
  2096. // Check which implementation is available
  2097. var requestMethod = element.requestFullscreen ||
  2098. element.webkitRequestFullscreen ||
  2099. element.webkitRequestFullScreen ||
  2100. element.mozRequestFullScreen ||
  2101. element.msRequestFullscreen;
  2102. if( requestMethod ) {
  2103. requestMethod.apply( element );
  2104. }
  2105. }
  2106. /**
  2107. * Shows the mouse pointer after it has been hidden with
  2108. * #hideCursor.
  2109. */
  2110. function showCursor() {
  2111. if( cursorHidden ) {
  2112. cursorHidden = false;
  2113. dom.wrapper.style.cursor = '';
  2114. }
  2115. }
  2116. /**
  2117. * Hides the mouse pointer when it's on top of the .reveal
  2118. * container.
  2119. */
  2120. function hideCursor() {
  2121. if( cursorHidden === false ) {
  2122. cursorHidden = true;
  2123. dom.wrapper.style.cursor = 'none';
  2124. }
  2125. }
  2126. /**
  2127. * Enters the paused mode which fades everything on screen to
  2128. * black.
  2129. */
  2130. function pause() {
  2131. if( config.pause ) {
  2132. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2133. cancelAutoSlide();
  2134. dom.wrapper.classList.add( 'paused' );
  2135. if( wasPaused === false ) {
  2136. dispatchEvent( 'paused' );
  2137. }
  2138. }
  2139. }
  2140. /**
  2141. * Exits from the paused mode.
  2142. */
  2143. function resume() {
  2144. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2145. dom.wrapper.classList.remove( 'paused' );
  2146. cueAutoSlide();
  2147. if( wasPaused ) {
  2148. dispatchEvent( 'resumed' );
  2149. }
  2150. }
  2151. /**
  2152. * Toggles the paused mode on and off.
  2153. */
  2154. function togglePause( override ) {
  2155. if( typeof override === 'boolean' ) {
  2156. override ? pause() : resume();
  2157. }
  2158. else {
  2159. isPaused() ? resume() : pause();
  2160. }
  2161. }
  2162. /**
  2163. * Checks if we are currently in the paused mode.
  2164. *
  2165. * @return {Boolean}
  2166. */
  2167. function isPaused() {
  2168. return dom.wrapper.classList.contains( 'paused' );
  2169. }
  2170. /**
  2171. * Toggles the auto slide mode on and off.
  2172. *
  2173. * @param {Boolean} [override] Flag which sets the desired state.
  2174. * True means autoplay starts, false means it stops.
  2175. */
  2176. function toggleAutoSlide( override ) {
  2177. if( typeof override === 'boolean' ) {
  2178. override ? resumeAutoSlide() : pauseAutoSlide();
  2179. }
  2180. else {
  2181. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  2182. }
  2183. }
  2184. /**
  2185. * Checks if the auto slide mode is currently on.
  2186. *
  2187. * @return {Boolean}
  2188. */
  2189. function isAutoSliding() {
  2190. return !!( autoSlide && !autoSlidePaused );
  2191. }
  2192. /**
  2193. * Steps from the current point in the presentation to the
  2194. * slide which matches the specified horizontal and vertical
  2195. * indices.
  2196. *
  2197. * @param {number} [h=indexh] Horizontal index of the target slide
  2198. * @param {number} [v=indexv] Vertical index of the target slide
  2199. * @param {number} [f] Index of a fragment within the
  2200. * target slide to activate
  2201. * @param {number} [o] Origin for use in multimaster environments
  2202. */
  2203. function slide( h, v, f, o ) {
  2204. // Remember where we were at before
  2205. previousSlide = currentSlide;
  2206. // Query all horizontal slides in the deck
  2207. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  2208. // Abort if there are no slides
  2209. if( horizontalSlides.length === 0 ) return;
  2210. // If no vertical index is specified and the upcoming slide is a
  2211. // stack, resume at its previous vertical index
  2212. if( v === undefined && !isOverview() ) {
  2213. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  2214. }
  2215. // If we were on a vertical stack, remember what vertical index
  2216. // it was on so we can resume at the same position when returning
  2217. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  2218. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  2219. }
  2220. // Remember the state before this slide
  2221. var stateBefore = state.concat();
  2222. // Reset the state array
  2223. state.length = 0;
  2224. var indexhBefore = indexh || 0,
  2225. indexvBefore = indexv || 0;
  2226. // Activate and transition to the new slide
  2227. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  2228. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  2229. // Update the visibility of slides now that the indices have changed
  2230. updateSlidesVisibility();
  2231. layout();
  2232. // Update the overview if it's currently active
  2233. if( isOverview() ) {
  2234. updateOverview();
  2235. }
  2236. // Find the current horizontal slide and any possible vertical slides
  2237. // within it
  2238. var currentHorizontalSlide = horizontalSlides[ indexh ],
  2239. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  2240. // Store references to the previous and current slides
  2241. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  2242. // Show fragment, if specified
  2243. if( typeof f !== 'undefined' ) {
  2244. navigateFragment( f );
  2245. }
  2246. // Dispatch an event if the slide changed
  2247. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  2248. if (!slideChanged) {
  2249. // Ensure that the previous slide is never the same as the current
  2250. previousSlide = null;
  2251. }
  2252. // Solves an edge case where the previous slide maintains the
  2253. // 'present' class when navigating between adjacent vertical
  2254. // stacks
  2255. if( previousSlide && previousSlide !== currentSlide ) {
  2256. previousSlide.classList.remove( 'present' );
  2257. previousSlide.setAttribute( 'aria-hidden', 'true' );
  2258. // Reset all slides upon navigate to home
  2259. // Issue: #285
  2260. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  2261. // Launch async task
  2262. setTimeout( function () {
  2263. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  2264. for( i in slides ) {
  2265. if( slides[i] ) {
  2266. // Reset stack
  2267. setPreviousVerticalIndex( slides[i], 0 );
  2268. }
  2269. }
  2270. }, 0 );
  2271. }
  2272. }
  2273. // Apply the new state
  2274. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  2275. // Check if this state existed on the previous slide. If it
  2276. // did, we will avoid adding it repeatedly
  2277. for( var j = 0; j < stateBefore.length; j++ ) {
  2278. if( stateBefore[j] === state[i] ) {
  2279. stateBefore.splice( j, 1 );
  2280. continue stateLoop;
  2281. }
  2282. }
  2283. document.documentElement.classList.add( state[i] );
  2284. // Dispatch custom event matching the state's name
  2285. dispatchEvent( state[i] );
  2286. }
  2287. // Clean up the remains of the previous state
  2288. while( stateBefore.length ) {
  2289. document.documentElement.classList.remove( stateBefore.pop() );
  2290. }
  2291. if( slideChanged ) {
  2292. dispatchEvent( 'slidechanged', {
  2293. 'indexh': indexh,
  2294. 'indexv': indexv,
  2295. 'previousSlide': previousSlide,
  2296. 'currentSlide': currentSlide,
  2297. 'origin': o
  2298. } );
  2299. }
  2300. // Handle embedded content
  2301. if( slideChanged || !previousSlide ) {
  2302. stopEmbeddedContent( previousSlide );
  2303. startEmbeddedContent( currentSlide );
  2304. }
  2305. // Announce the current slide contents, for screen readers
  2306. dom.statusDiv.textContent = getStatusText( currentSlide );
  2307. updateControls();
  2308. updateProgress();
  2309. updateBackground();
  2310. updateParallax();
  2311. updateSlideNumber();
  2312. updateNotes();
  2313. updateFragments();
  2314. // Update the URL hash
  2315. writeURL();
  2316. cueAutoSlide();
  2317. }
  2318. /**
  2319. * Syncs the presentation with the current DOM. Useful
  2320. * when new slides or control elements are added or when
  2321. * the configuration has changed.
  2322. */
  2323. function sync() {
  2324. // Subscribe to input
  2325. removeEventListeners();
  2326. addEventListeners();
  2327. // Force a layout to make sure the current config is accounted for
  2328. layout();
  2329. // Reflect the current autoSlide value
  2330. autoSlide = config.autoSlide;
  2331. // Start auto-sliding if it's enabled
  2332. cueAutoSlide();
  2333. // Re-create the slide backgrounds
  2334. createBackgrounds();
  2335. // Write the current hash to the URL
  2336. writeURL();
  2337. sortAllFragments();
  2338. updateControls();
  2339. updateProgress();
  2340. updateSlideNumber();
  2341. updateSlidesVisibility();
  2342. updateBackground( true );
  2343. updateNotesVisibility();
  2344. updateNotes();
  2345. formatEmbeddedContent();
  2346. // Start or stop embedded content depending on global config
  2347. if( config.autoPlayMedia === false ) {
  2348. stopEmbeddedContent( currentSlide, { unloadIframes: false } );
  2349. }
  2350. else {
  2351. startEmbeddedContent( currentSlide );
  2352. }
  2353. if( isOverview() ) {
  2354. layoutOverview();
  2355. }
  2356. }
  2357. /**
  2358. * Updates reveal.js to keep in sync with new slide attributes. For
  2359. * example, if you add a new `data-background-image` you can call
  2360. * this to have reveal.js render the new background image.
  2361. *
  2362. * Similar to #sync() but more efficient when you only need to
  2363. * refresh a specific slide.
  2364. *
  2365. * @param {HTMLElement} slide
  2366. */
  2367. function syncSlide( slide ) {
  2368. // Default to the current slide
  2369. slide = slide || currentSlide;
  2370. syncBackground( slide );
  2371. syncFragments( slide );
  2372. updateBackground();
  2373. updateNotes();
  2374. loadSlide( slide );
  2375. }
  2376. /**
  2377. * Formats the fragments on the given slide so that they have
  2378. * valid indices. Call this if fragments are changed in the DOM
  2379. * after reveal.js has already initialized.
  2380. *
  2381. * @param {HTMLElement} slide
  2382. * @return {Array} a list of the HTML fragments that were synced
  2383. */
  2384. function syncFragments( slide ) {
  2385. // Default to the current slide
  2386. slide = slide || currentSlide;
  2387. return sortFragments( slide.querySelectorAll( '.fragment' ) );
  2388. }
  2389. /**
  2390. * Resets all vertical slides so that only the first
  2391. * is visible.
  2392. */
  2393. function resetVerticalSlides() {
  2394. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2395. horizontalSlides.forEach( function( horizontalSlide ) {
  2396. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2397. verticalSlides.forEach( function( verticalSlide, y ) {
  2398. if( y > 0 ) {
  2399. verticalSlide.classList.remove( 'present' );
  2400. verticalSlide.classList.remove( 'past' );
  2401. verticalSlide.classList.add( 'future' );
  2402. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  2403. }
  2404. } );
  2405. } );
  2406. }
  2407. /**
  2408. * Sorts and formats all of fragments in the
  2409. * presentation.
  2410. */
  2411. function sortAllFragments() {
  2412. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2413. horizontalSlides.forEach( function( horizontalSlide ) {
  2414. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2415. verticalSlides.forEach( function( verticalSlide, y ) {
  2416. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  2417. } );
  2418. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  2419. } );
  2420. }
  2421. /**
  2422. * Randomly shuffles all slides in the deck.
  2423. */
  2424. function shuffle() {
  2425. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2426. slides.forEach( function( slide ) {
  2427. // Insert this slide next to another random slide. This may
  2428. // cause the slide to insert before itself but that's fine.
  2429. dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
  2430. } );
  2431. }
  2432. /**
  2433. * Updates one dimension of slides by showing the slide
  2434. * with the specified index.
  2435. *
  2436. * @param {string} selector A CSS selector that will fetch
  2437. * the group of slides we are working with
  2438. * @param {number} index The index of the slide that should be
  2439. * shown
  2440. *
  2441. * @return {number} The index of the slide that is now shown,
  2442. * might differ from the passed in index if it was out of
  2443. * bounds.
  2444. */
  2445. function updateSlides( selector, index ) {
  2446. // Select all slides and convert the NodeList result to
  2447. // an array
  2448. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  2449. slidesLength = slides.length;
  2450. var printMode = isPrintingPDF();
  2451. if( slidesLength ) {
  2452. // Should the index loop?
  2453. if( config.loop ) {
  2454. index %= slidesLength;
  2455. if( index < 0 ) {
  2456. index = slidesLength + index;
  2457. }
  2458. }
  2459. // Enforce max and minimum index bounds
  2460. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  2461. for( var i = 0; i < slidesLength; i++ ) {
  2462. var element = slides[i];
  2463. var reverse = config.rtl && !isVerticalSlide( element );
  2464. element.classList.remove( 'past' );
  2465. element.classList.remove( 'present' );
  2466. element.classList.remove( 'future' );
  2467. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  2468. element.setAttribute( 'hidden', '' );
  2469. element.setAttribute( 'aria-hidden', 'true' );
  2470. // If this element contains vertical slides
  2471. if( element.querySelector( 'section' ) ) {
  2472. element.classList.add( 'stack' );
  2473. }
  2474. // If we're printing static slides, all slides are "present"
  2475. if( printMode ) {
  2476. element.classList.add( 'present' );
  2477. continue;
  2478. }
  2479. if( i < index ) {
  2480. // Any element previous to index is given the 'past' class
  2481. element.classList.add( reverse ? 'future' : 'past' );
  2482. if( config.fragments ) {
  2483. // Show all fragments in prior slides
  2484. toArray( element.querySelectorAll( '.fragment' ) ).forEach( function( fragment ) {
  2485. fragment.classList.add( 'visible' );
  2486. fragment.classList.remove( 'current-fragment' );
  2487. } );
  2488. }
  2489. }
  2490. else if( i > index ) {
  2491. // Any element subsequent to index is given the 'future' class
  2492. element.classList.add( reverse ? 'past' : 'future' );
  2493. if( config.fragments ) {
  2494. // Hide all fragments in future slides
  2495. toArray( element.querySelectorAll( '.fragment.visible' ) ).forEach( function( fragment ) {
  2496. fragment.classList.remove( 'visible' );
  2497. fragment.classList.remove( 'current-fragment' );
  2498. } );
  2499. }
  2500. }
  2501. }
  2502. // Mark the current slide as present
  2503. slides[index].classList.add( 'present' );
  2504. slides[index].removeAttribute( 'hidden' );
  2505. slides[index].removeAttribute( 'aria-hidden' );
  2506. // If this slide has a state associated with it, add it
  2507. // onto the current state of the deck
  2508. var slideState = slides[index].getAttribute( 'data-state' );
  2509. if( slideState ) {
  2510. state = state.concat( slideState.split( ' ' ) );
  2511. }
  2512. }
  2513. else {
  2514. // Since there are no slides we can't be anywhere beyond the
  2515. // zeroth index
  2516. index = 0;
  2517. }
  2518. return index;
  2519. }
  2520. /**
  2521. * Optimization method; hide all slides that are far away
  2522. * from the present slide.
  2523. */
  2524. function updateSlidesVisibility() {
  2525. // Select all slides and convert the NodeList result to
  2526. // an array
  2527. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  2528. horizontalSlidesLength = horizontalSlides.length,
  2529. distanceX,
  2530. distanceY;
  2531. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  2532. // The number of steps away from the present slide that will
  2533. // be visible
  2534. var viewDistance = isOverview() ? 10 : config.viewDistance;
  2535. // Limit view distance on weaker devices
  2536. if( isMobileDevice ) {
  2537. viewDistance = isOverview() ? 6 : 2;
  2538. }
  2539. // All slides need to be visible when exporting to PDF
  2540. if( isPrintingPDF() ) {
  2541. viewDistance = Number.MAX_VALUE;
  2542. }
  2543. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  2544. var horizontalSlide = horizontalSlides[x];
  2545. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  2546. verticalSlidesLength = verticalSlides.length;
  2547. // Determine how far away this slide is from the present
  2548. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  2549. // If the presentation is looped, distance should measure
  2550. // 1 between the first and last slides
  2551. if( config.loop ) {
  2552. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  2553. }
  2554. // Show the horizontal slide if it's within the view distance
  2555. if( distanceX < viewDistance ) {
  2556. loadSlide( horizontalSlide );
  2557. }
  2558. else {
  2559. unloadSlide( horizontalSlide );
  2560. }
  2561. if( verticalSlidesLength ) {
  2562. var oy = getPreviousVerticalIndex( horizontalSlide );
  2563. for( var y = 0; y < verticalSlidesLength; y++ ) {
  2564. var verticalSlide = verticalSlides[y];
  2565. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  2566. if( distanceX + distanceY < viewDistance ) {
  2567. loadSlide( verticalSlide );
  2568. }
  2569. else {
  2570. unloadSlide( verticalSlide );
  2571. }
  2572. }
  2573. }
  2574. }
  2575. // Flag if there are ANY vertical slides, anywhere in the deck
  2576. if( dom.wrapper.querySelectorAll( '.slides>section>section' ).length ) {
  2577. dom.wrapper.classList.add( 'has-vertical-slides' );
  2578. }
  2579. else {
  2580. dom.wrapper.classList.remove( 'has-vertical-slides' );
  2581. }
  2582. // Flag if there are ANY horizontal slides, anywhere in the deck
  2583. if( dom.wrapper.querySelectorAll( '.slides>section' ).length > 1 ) {
  2584. dom.wrapper.classList.add( 'has-horizontal-slides' );
  2585. }
  2586. else {
  2587. dom.wrapper.classList.remove( 'has-horizontal-slides' );
  2588. }
  2589. }
  2590. }
  2591. /**
  2592. * Pick up notes from the current slide and display them
  2593. * to the viewer.
  2594. *
  2595. * @see {@link config.showNotes}
  2596. */
  2597. function updateNotes() {
  2598. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  2599. dom.speakerNotes.innerHTML = getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
  2600. }
  2601. }
  2602. /**
  2603. * Updates the visibility of the speaker notes sidebar that
  2604. * is used to share annotated slides. The notes sidebar is
  2605. * only visible if showNotes is true and there are notes on
  2606. * one or more slides in the deck.
  2607. */
  2608. function updateNotesVisibility() {
  2609. if( config.showNotes && hasNotes() ) {
  2610. dom.wrapper.classList.add( 'show-notes' );
  2611. }
  2612. else {
  2613. dom.wrapper.classList.remove( 'show-notes' );
  2614. }
  2615. }
  2616. /**
  2617. * Checks if there are speaker notes for ANY slide in the
  2618. * presentation.
  2619. */
  2620. function hasNotes() {
  2621. return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0;
  2622. }
  2623. /**
  2624. * Updates the progress bar to reflect the current slide.
  2625. */
  2626. function updateProgress() {
  2627. // Update progress if enabled
  2628. if( config.progress && dom.progressbar ) {
  2629. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  2630. }
  2631. }
  2632. /**
  2633. * Updates the slide number to match the current slide.
  2634. */
  2635. function updateSlideNumber() {
  2636. // Update slide number if enabled
  2637. if( config.slideNumber && dom.slideNumber ) {
  2638. var value;
  2639. var format = 'h.v';
  2640. if( typeof config.slideNumber === 'function' ) {
  2641. value = config.slideNumber();
  2642. }
  2643. else {
  2644. // Check if a custom number format is available
  2645. if( typeof config.slideNumber === 'string' ) {
  2646. format = config.slideNumber;
  2647. }
  2648. // If there are ONLY vertical slides in this deck, always use
  2649. // a flattened slide number
  2650. if( !/c/.test( format ) && dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length === 1 ) {
  2651. format = 'c';
  2652. }
  2653. value = [];
  2654. switch( format ) {
  2655. case 'c':
  2656. value.push( getSlidePastCount() + 1 );
  2657. break;
  2658. case 'c/t':
  2659. value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
  2660. break;
  2661. case 'h/v':
  2662. value.push( indexh + 1 );
  2663. if( isVerticalSlide() ) value.push( '/', indexv + 1 );
  2664. break;
  2665. default:
  2666. value.push( indexh + 1 );
  2667. if( isVerticalSlide() ) value.push( '.', indexv + 1 );
  2668. }
  2669. }
  2670. dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
  2671. }
  2672. }
  2673. /**
  2674. * Applies HTML formatting to a slide number before it's
  2675. * written to the DOM.
  2676. *
  2677. * @param {number} a Current slide
  2678. * @param {string} delimiter Character to separate slide numbers
  2679. * @param {(number|*)} b Total slides
  2680. * @return {string} HTML string fragment
  2681. */
  2682. function formatSlideNumber( a, delimiter, b ) {
  2683. var url = '#' + locationHash();
  2684. if( typeof b === 'number' && !isNaN( b ) ) {
  2685. return '<a href="' + url + '">' +
  2686. '<span class="slide-number-a">'+ a +'</span>' +
  2687. '<span class="slide-number-delimiter">'+ delimiter +'</span>' +
  2688. '<span class="slide-number-b">'+ b +'</span>' +
  2689. '</a>';
  2690. }
  2691. else {
  2692. return '<a href="' + url + '">' +
  2693. '<span class="slide-number-a">'+ a +'</span>' +
  2694. '</a>';
  2695. }
  2696. }
  2697. /**
  2698. * Updates the state of all control/navigation arrows.
  2699. */
  2700. function updateControls() {
  2701. var routes = availableRoutes();
  2702. var fragments = availableFragments();
  2703. // Remove the 'enabled' class from all directions
  2704. dom.controlsLeft.concat( dom.controlsRight )
  2705. .concat( dom.controlsUp )
  2706. .concat( dom.controlsDown )
  2707. .concat( dom.controlsPrev )
  2708. .concat( dom.controlsNext ).forEach( function( node ) {
  2709. node.classList.remove( 'enabled' );
  2710. node.classList.remove( 'fragmented' );
  2711. // Set 'disabled' attribute on all directions
  2712. node.setAttribute( 'disabled', 'disabled' );
  2713. } );
  2714. // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
  2715. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2716. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2717. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2718. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2719. // Prev/next buttons
  2720. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2721. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2722. // Highlight fragment directions
  2723. if( currentSlide ) {
  2724. // Always apply fragment decorator to prev/next buttons
  2725. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2726. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2727. // Apply fragment decorators to directional buttons based on
  2728. // what slide axis they are in
  2729. if( isVerticalSlide( currentSlide ) ) {
  2730. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2731. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2732. }
  2733. else {
  2734. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2735. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2736. }
  2737. }
  2738. if( config.controlsTutorial ) {
  2739. // Highlight control arrows with an animation to ensure
  2740. // that the viewer knows how to navigate
  2741. if( !hasNavigatedDown && routes.down ) {
  2742. dom.controlsDownArrow.classList.add( 'highlight' );
  2743. }
  2744. else {
  2745. dom.controlsDownArrow.classList.remove( 'highlight' );
  2746. if( !hasNavigatedRight && routes.right && indexv === 0 ) {
  2747. dom.controlsRightArrow.classList.add( 'highlight' );
  2748. }
  2749. else {
  2750. dom.controlsRightArrow.classList.remove( 'highlight' );
  2751. }
  2752. }
  2753. }
  2754. }
  2755. /**
  2756. * Updates the background elements to reflect the current
  2757. * slide.
  2758. *
  2759. * @param {boolean} includeAll If true, the backgrounds of
  2760. * all vertical slides (not just the present) will be updated.
  2761. */
  2762. function updateBackground( includeAll ) {
  2763. var currentBackground = null;
  2764. // Reverse past/future classes when in RTL mode
  2765. var horizontalPast = config.rtl ? 'future' : 'past',
  2766. horizontalFuture = config.rtl ? 'past' : 'future';
  2767. // Update the classes of all backgrounds to match the
  2768. // states of their slides (past/present/future)
  2769. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2770. backgroundh.classList.remove( 'past' );
  2771. backgroundh.classList.remove( 'present' );
  2772. backgroundh.classList.remove( 'future' );
  2773. if( h < indexh ) {
  2774. backgroundh.classList.add( horizontalPast );
  2775. }
  2776. else if ( h > indexh ) {
  2777. backgroundh.classList.add( horizontalFuture );
  2778. }
  2779. else {
  2780. backgroundh.classList.add( 'present' );
  2781. // Store a reference to the current background element
  2782. currentBackground = backgroundh;
  2783. }
  2784. if( includeAll || h === indexh ) {
  2785. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2786. backgroundv.classList.remove( 'past' );
  2787. backgroundv.classList.remove( 'present' );
  2788. backgroundv.classList.remove( 'future' );
  2789. if( v < indexv ) {
  2790. backgroundv.classList.add( 'past' );
  2791. }
  2792. else if ( v > indexv ) {
  2793. backgroundv.classList.add( 'future' );
  2794. }
  2795. else {
  2796. backgroundv.classList.add( 'present' );
  2797. // Only if this is the present horizontal and vertical slide
  2798. if( h === indexh ) currentBackground = backgroundv;
  2799. }
  2800. } );
  2801. }
  2802. } );
  2803. // Stop content inside of previous backgrounds
  2804. if( previousBackground ) {
  2805. stopEmbeddedContent( previousBackground );
  2806. }
  2807. // Start content in the current background
  2808. if( currentBackground ) {
  2809. startEmbeddedContent( currentBackground );
  2810. var currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
  2811. if( currentBackgroundContent ) {
  2812. var backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';
  2813. // Restart GIFs (doesn't work in Firefox)
  2814. if( /\.gif/i.test( backgroundImageURL ) ) {
  2815. currentBackgroundContent.style.backgroundImage = '';
  2816. window.getComputedStyle( currentBackgroundContent ).opacity;
  2817. currentBackgroundContent.style.backgroundImage = backgroundImageURL;
  2818. }
  2819. }
  2820. // Don't transition between identical backgrounds. This
  2821. // prevents unwanted flicker.
  2822. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2823. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2824. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2825. dom.background.classList.add( 'no-transition' );
  2826. }
  2827. previousBackground = currentBackground;
  2828. }
  2829. // If there's a background brightness flag for this slide,
  2830. // bubble it to the .reveal container
  2831. if( currentSlide ) {
  2832. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2833. if( currentSlide.classList.contains( classToBubble ) ) {
  2834. dom.wrapper.classList.add( classToBubble );
  2835. }
  2836. else {
  2837. dom.wrapper.classList.remove( classToBubble );
  2838. }
  2839. } );
  2840. }
  2841. // Allow the first background to apply without transition
  2842. setTimeout( function() {
  2843. dom.background.classList.remove( 'no-transition' );
  2844. }, 1 );
  2845. }
  2846. /**
  2847. * Updates the position of the parallax background based
  2848. * on the current slide index.
  2849. */
  2850. function updateParallax() {
  2851. if( config.parallaxBackgroundImage ) {
  2852. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2853. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2854. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2855. backgroundWidth, backgroundHeight;
  2856. if( backgroundSize.length === 1 ) {
  2857. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2858. }
  2859. else {
  2860. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2861. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2862. }
  2863. var slideWidth = dom.background.offsetWidth,
  2864. horizontalSlideCount = horizontalSlides.length,
  2865. horizontalOffsetMultiplier,
  2866. horizontalOffset;
  2867. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2868. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2869. }
  2870. else {
  2871. horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
  2872. }
  2873. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2874. var slideHeight = dom.background.offsetHeight,
  2875. verticalSlideCount = verticalSlides.length,
  2876. verticalOffsetMultiplier,
  2877. verticalOffset;
  2878. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2879. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2880. }
  2881. else {
  2882. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2883. }
  2884. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0;
  2885. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2886. }
  2887. }
  2888. /**
  2889. * Should the given element be preloaded?
  2890. * Decides based on local element attributes and global config.
  2891. *
  2892. * @param {HTMLElement} element
  2893. */
  2894. function shouldPreload( element ) {
  2895. // Prefer an explicit global preload setting
  2896. var preload = config.preloadIframes;
  2897. // If no global setting is available, fall back on the element's
  2898. // own preload setting
  2899. if( typeof preload !== 'boolean' ) {
  2900. preload = element.hasAttribute( 'data-preload' );
  2901. }
  2902. return preload;
  2903. }
  2904. /**
  2905. * Called when the given slide is within the configured view
  2906. * distance. Shows the slide element and loads any content
  2907. * that is set to load lazily (data-src).
  2908. *
  2909. * @param {HTMLElement} slide Slide to show
  2910. */
  2911. function loadSlide( slide, options ) {
  2912. options = options || {};
  2913. // Show the slide element
  2914. slide.style.display = config.display;
  2915. // Media elements with data-src attributes
  2916. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  2917. if( element.tagName !== 'IFRAME' || shouldPreload( element ) ) {
  2918. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2919. element.setAttribute( 'data-lazy-loaded', '' );
  2920. element.removeAttribute( 'data-src' );
  2921. }
  2922. } );
  2923. // Media elements with <source> children
  2924. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2925. var sources = 0;
  2926. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2927. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2928. source.removeAttribute( 'data-src' );
  2929. source.setAttribute( 'data-lazy-loaded', '' );
  2930. sources += 1;
  2931. } );
  2932. // If we rewrote sources for this video/audio element, we need
  2933. // to manually tell it to load from its new origin
  2934. if( sources > 0 ) {
  2935. media.load();
  2936. }
  2937. } );
  2938. // Show the corresponding background element
  2939. var background = slide.slideBackgroundElement;
  2940. if( background ) {
  2941. background.style.display = 'block';
  2942. var backgroundContent = slide.slideBackgroundContentElement;
  2943. // If the background contains media, load it
  2944. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2945. background.setAttribute( 'data-loaded', 'true' );
  2946. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2947. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2948. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2949. backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ),
  2950. backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2951. // Images
  2952. if( backgroundImage ) {
  2953. backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')';
  2954. }
  2955. // Videos
  2956. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2957. var video = document.createElement( 'video' );
  2958. if( backgroundVideoLoop ) {
  2959. video.setAttribute( 'loop', '' );
  2960. }
  2961. if( backgroundVideoMuted ) {
  2962. video.muted = true;
  2963. }
  2964. // Inline video playback works (at least in Mobile Safari) as
  2965. // long as the video is muted and the `playsinline` attribute is
  2966. // present
  2967. if( isMobileDevice ) {
  2968. video.muted = true;
  2969. video.autoplay = true;
  2970. video.setAttribute( 'playsinline', '' );
  2971. }
  2972. // Support comma separated lists of video sources
  2973. backgroundVideo.split( ',' ).forEach( function( source ) {
  2974. video.innerHTML += '<source src="'+ source +'">';
  2975. } );
  2976. backgroundContent.appendChild( video );
  2977. }
  2978. // Iframes
  2979. else if( backgroundIframe && options.excludeIframes !== true ) {
  2980. var iframe = document.createElement( 'iframe' );
  2981. iframe.setAttribute( 'allowfullscreen', '' );
  2982. iframe.setAttribute( 'mozallowfullscreen', '' );
  2983. iframe.setAttribute( 'webkitallowfullscreen', '' );
  2984. // Only load autoplaying content when the slide is shown to
  2985. // avoid having it play in the background
  2986. if( /autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
  2987. iframe.setAttribute( 'data-src', backgroundIframe );
  2988. }
  2989. else {
  2990. iframe.setAttribute( 'src', backgroundIframe );
  2991. }
  2992. iframe.style.width = '100%';
  2993. iframe.style.height = '100%';
  2994. iframe.style.maxHeight = '100%';
  2995. iframe.style.maxWidth = '100%';
  2996. backgroundContent.appendChild( iframe );
  2997. }
  2998. }
  2999. }
  3000. }
  3001. /**
  3002. * Unloads and hides the given slide. This is called when the
  3003. * slide is moved outside of the configured view distance.
  3004. *
  3005. * @param {HTMLElement} slide
  3006. */
  3007. function unloadSlide( slide ) {
  3008. // Hide the slide element
  3009. slide.style.display = 'none';
  3010. // Hide the corresponding background element
  3011. var background = getSlideBackground( slide );
  3012. if( background ) {
  3013. background.style.display = 'none';
  3014. }
  3015. // Reset lazy-loaded media elements with src attributes
  3016. toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ) ).forEach( function( element ) {
  3017. element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
  3018. element.removeAttribute( 'src' );
  3019. } );
  3020. // Reset lazy-loaded media elements with <source> children
  3021. toArray( slide.querySelectorAll( 'video[data-lazy-loaded] source[src], audio source[src]' ) ).forEach( function( source ) {
  3022. source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
  3023. source.removeAttribute( 'src' );
  3024. } );
  3025. }
  3026. /**
  3027. * Determine what available routes there are for navigation.
  3028. *
  3029. * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
  3030. */
  3031. function availableRoutes() {
  3032. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  3033. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  3034. var routes = {
  3035. left: indexh > 0,
  3036. right: indexh < horizontalSlides.length - 1,
  3037. up: indexv > 0,
  3038. down: indexv < verticalSlides.length - 1
  3039. };
  3040. // Looped presentations can always be navigated as long as
  3041. // there are slides available
  3042. if( config.loop ) {
  3043. if( horizontalSlides.length > 1 ) {
  3044. routes.left = true;
  3045. routes.right = true;
  3046. }
  3047. if( verticalSlides.length > 1 ) {
  3048. routes.up = true;
  3049. routes.down = true;
  3050. }
  3051. }
  3052. // Reverse horizontal controls for rtl
  3053. if( config.rtl ) {
  3054. var left = routes.left;
  3055. routes.left = routes.right;
  3056. routes.right = left;
  3057. }
  3058. return routes;
  3059. }
  3060. /**
  3061. * Returns an object describing the available fragment
  3062. * directions.
  3063. *
  3064. * @return {{prev: boolean, next: boolean}}
  3065. */
  3066. function availableFragments() {
  3067. if( currentSlide && config.fragments ) {
  3068. var fragments = currentSlide.querySelectorAll( '.fragment' );
  3069. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  3070. return {
  3071. prev: fragments.length - hiddenFragments.length > 0,
  3072. next: !!hiddenFragments.length
  3073. };
  3074. }
  3075. else {
  3076. return { prev: false, next: false };
  3077. }
  3078. }
  3079. /**
  3080. * Enforces origin-specific format rules for embedded media.
  3081. */
  3082. function formatEmbeddedContent() {
  3083. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  3084. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  3085. var src = el.getAttribute( sourceAttribute );
  3086. if( src && src.indexOf( param ) === -1 ) {
  3087. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  3088. }
  3089. });
  3090. };
  3091. // YouTube frames must include "?enablejsapi=1"
  3092. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  3093. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  3094. // Vimeo frames must include "?api=1"
  3095. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  3096. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  3097. }
  3098. /**
  3099. * Start playback of any embedded content inside of
  3100. * the given element.
  3101. *
  3102. * @param {HTMLElement} element
  3103. */
  3104. function startEmbeddedContent( element ) {
  3105. if( element && !isSpeakerNotes() ) {
  3106. // Restart GIFs
  3107. toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  3108. // Setting the same unchanged source like this was confirmed
  3109. // to work in Chrome, FF & Safari
  3110. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  3111. } );
  3112. // HTML5 media elements
  3113. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3114. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3115. return;
  3116. }
  3117. // Prefer an explicit global autoplay setting
  3118. var autoplay = config.autoPlayMedia;
  3119. // If no global setting is available, fall back on the element's
  3120. // own autoplay setting
  3121. if( typeof autoplay !== 'boolean' ) {
  3122. autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
  3123. }
  3124. if( autoplay && typeof el.play === 'function' ) {
  3125. // If the media is ready, start playback
  3126. if( el.readyState > 1 ) {
  3127. startEmbeddedMedia( { target: el } );
  3128. }
  3129. // Mobile devices never fire a loaded event so instead
  3130. // of waiting, we initiate playback
  3131. else if( isMobileDevice ) {
  3132. var promise = el.play();
  3133. // If autoplay does not work, ensure that the controls are visible so
  3134. // that the viewer can start the media on their own
  3135. if( promise && typeof promise.catch === 'function' && el.controls === false ) {
  3136. promise.catch( function() {
  3137. el.controls = true;
  3138. // Once the video does start playing, hide the controls again
  3139. el.addEventListener( 'play', function() {
  3140. el.controls = false;
  3141. } );
  3142. } );
  3143. }
  3144. }
  3145. // If the media isn't loaded, wait before playing
  3146. else {
  3147. el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes
  3148. el.addEventListener( 'loadeddata', startEmbeddedMedia );
  3149. }
  3150. }
  3151. } );
  3152. // Normal iframes
  3153. toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  3154. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3155. return;
  3156. }
  3157. startEmbeddedIframe( { target: el } );
  3158. } );
  3159. // Lazy loading iframes
  3160. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3161. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3162. return;
  3163. }
  3164. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  3165. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  3166. el.addEventListener( 'load', startEmbeddedIframe );
  3167. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  3168. }
  3169. } );
  3170. }
  3171. }
  3172. /**
  3173. * Starts playing an embedded video/audio element after
  3174. * it has finished loading.
  3175. *
  3176. * @param {object} event
  3177. */
  3178. function startEmbeddedMedia( event ) {
  3179. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3180. isVisible = !!closestParent( event.target, '.present' );
  3181. if( isAttachedToDOM && isVisible ) {
  3182. event.target.currentTime = 0;
  3183. event.target.play();
  3184. }
  3185. event.target.removeEventListener( 'loadeddata', startEmbeddedMedia );
  3186. }
  3187. /**
  3188. * "Starts" the content of an embedded iframe using the
  3189. * postMessage API.
  3190. *
  3191. * @param {object} event
  3192. */
  3193. function startEmbeddedIframe( event ) {
  3194. var iframe = event.target;
  3195. if( iframe && iframe.contentWindow ) {
  3196. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3197. isVisible = !!closestParent( event.target, '.present' );
  3198. if( isAttachedToDOM && isVisible ) {
  3199. // Prefer an explicit global autoplay setting
  3200. var autoplay = config.autoPlayMedia;
  3201. // If no global setting is available, fall back on the element's
  3202. // own autoplay setting
  3203. if( typeof autoplay !== 'boolean' ) {
  3204. autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
  3205. }
  3206. // YouTube postMessage API
  3207. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3208. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  3209. }
  3210. // Vimeo postMessage API
  3211. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3212. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  3213. }
  3214. // Generic postMessage API
  3215. else {
  3216. iframe.contentWindow.postMessage( 'slide:start', '*' );
  3217. }
  3218. }
  3219. }
  3220. }
  3221. /**
  3222. * Stop playback of any embedded content inside of
  3223. * the targeted slide.
  3224. *
  3225. * @param {HTMLElement} element
  3226. */
  3227. function stopEmbeddedContent( element, options ) {
  3228. options = extend( {
  3229. // Defaults
  3230. unloadIframes: true
  3231. }, options || {} );
  3232. if( element && element.parentNode ) {
  3233. // HTML5 media elements
  3234. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3235. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  3236. el.setAttribute('data-paused-by-reveal', '');
  3237. el.pause();
  3238. }
  3239. } );
  3240. // Generic postMessage API for non-lazy loaded iframes
  3241. toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  3242. if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
  3243. el.removeEventListener( 'load', startEmbeddedIframe );
  3244. });
  3245. // YouTube postMessage API
  3246. toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  3247. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3248. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  3249. }
  3250. });
  3251. // Vimeo postMessage API
  3252. toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  3253. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3254. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  3255. }
  3256. });
  3257. if( options.unloadIframes === true ) {
  3258. // Unload lazy-loaded iframes
  3259. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3260. // Only removing the src doesn't actually unload the frame
  3261. // in all browsers (Firefox) so we set it to blank first
  3262. el.setAttribute( 'src', 'about:blank' );
  3263. el.removeAttribute( 'src' );
  3264. } );
  3265. }
  3266. }
  3267. }
  3268. /**
  3269. * Returns the number of past slides. This can be used as a global
  3270. * flattened index for slides.
  3271. *
  3272. * @return {number} Past slide count
  3273. */
  3274. function getSlidePastCount() {
  3275. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3276. // The number of past slides
  3277. var pastCount = 0;
  3278. // Step through all slides and count the past ones
  3279. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  3280. var horizontalSlide = horizontalSlides[i];
  3281. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  3282. for( var j = 0; j < verticalSlides.length; j++ ) {
  3283. // Stop as soon as we arrive at the present
  3284. if( verticalSlides[j].classList.contains( 'present' ) ) {
  3285. break mainLoop;
  3286. }
  3287. pastCount++;
  3288. }
  3289. // Stop as soon as we arrive at the present
  3290. if( horizontalSlide.classList.contains( 'present' ) ) {
  3291. break;
  3292. }
  3293. // Don't count the wrapping section for vertical slides
  3294. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  3295. pastCount++;
  3296. }
  3297. }
  3298. return pastCount;
  3299. }
  3300. /**
  3301. * Returns a value ranging from 0-1 that represents
  3302. * how far into the presentation we have navigated.
  3303. *
  3304. * @return {number}
  3305. */
  3306. function getProgress() {
  3307. // The number of past and total slides
  3308. var totalCount = getTotalSlides();
  3309. var pastCount = getSlidePastCount();
  3310. if( currentSlide ) {
  3311. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  3312. // If there are fragments in the current slide those should be
  3313. // accounted for in the progress.
  3314. if( allFragments.length > 0 ) {
  3315. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  3316. // This value represents how big a portion of the slide progress
  3317. // that is made up by its fragments (0-1)
  3318. var fragmentWeight = 0.9;
  3319. // Add fragment progress to the past slide count
  3320. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  3321. }
  3322. }
  3323. return Math.min( pastCount / ( totalCount - 1 ), 1 );
  3324. }
  3325. /**
  3326. * Checks if this presentation is running inside of the
  3327. * speaker notes window.
  3328. *
  3329. * @return {boolean}
  3330. */
  3331. function isSpeakerNotes() {
  3332. return !!window.location.search.match( /receiver/gi );
  3333. }
  3334. /**
  3335. * Reads the current URL (hash) and navigates accordingly.
  3336. */
  3337. function readURL() {
  3338. var hash = window.location.hash;
  3339. // Attempt to parse the hash as either an index or name
  3340. var bits = hash.slice( 2 ).split( '/' ),
  3341. name = hash.replace( /#|\//gi, '' );
  3342. // If the first bit is not fully numeric and there is a name we
  3343. // can assume that this is a named link
  3344. if( !/^[0-9]*$/.test( bits[0] ) && name.length ) {
  3345. var element;
  3346. // Ensure the named link is a valid HTML ID attribute
  3347. try {
  3348. element = document.getElementById( decodeURIComponent( name ) );
  3349. }
  3350. catch ( error ) { }
  3351. // Ensure that we're not already on a slide with the same name
  3352. var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
  3353. if( element ) {
  3354. // If the slide exists and is not the current slide...
  3355. if ( !isSameNameAsCurrentSlide ) {
  3356. // ...find the position of the named slide and navigate to it
  3357. var indices = Reveal.getIndices(element);
  3358. slide(indices.h, indices.v);
  3359. }
  3360. }
  3361. // If the slide doesn't exist, navigate to the current slide
  3362. else {
  3363. slide( indexh || 0, indexv || 0 );
  3364. }
  3365. }
  3366. else {
  3367. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  3368. // Read the index components of the hash
  3369. var h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,
  3370. v = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,
  3371. f;
  3372. if( config.fragmentInURL ) {
  3373. f = parseInt( bits[2], 10 );
  3374. if( isNaN( f ) ) {
  3375. f = undefined;
  3376. }
  3377. }
  3378. if( h !== indexh || v !== indexv || f !== undefined ) {
  3379. slide( h, v, f );
  3380. }
  3381. }
  3382. }
  3383. /**
  3384. * Updates the page URL (hash) to reflect the current
  3385. * state.
  3386. *
  3387. * @param {number} delay The time in ms to wait before
  3388. * writing the hash
  3389. */
  3390. function writeURL( delay ) {
  3391. // Make sure there's never more than one timeout running
  3392. clearTimeout( writeURLTimeout );
  3393. // If a delay is specified, timeout this call
  3394. if( typeof delay === 'number' ) {
  3395. writeURLTimeout = setTimeout( writeURL, delay );
  3396. }
  3397. else if( currentSlide ) {
  3398. // If we're configured to push to history OR the history
  3399. // API is not avaialble.
  3400. if( config.history || !window.history ) {
  3401. window.location.hash = locationHash();
  3402. }
  3403. // If we're configured to reflect the current slide in the
  3404. // URL without pushing to history.
  3405. else if( config.hash ) {
  3406. window.history.replaceState( null, null, '#' + locationHash() );
  3407. }
  3408. // If history and hash are both disabled, a hash may still
  3409. // be added to the URL by clicking on a href with a hash
  3410. // target. Counter this by always removing the hash.
  3411. else {
  3412. window.history.replaceState( null, null, window.location.pathname + window.location.search );
  3413. }
  3414. }
  3415. }
  3416. /**
  3417. * Retrieves the h/v location and fragment of the current,
  3418. * or specified, slide.
  3419. *
  3420. * @param {HTMLElement} [slide] If specified, the returned
  3421. * index will be for this slide rather than the currently
  3422. * active one
  3423. *
  3424. * @return {{h: number, v: number, f: number}}
  3425. */
  3426. function getIndices( slide ) {
  3427. // By default, return the current indices
  3428. var h = indexh,
  3429. v = indexv,
  3430. f;
  3431. // If a slide is specified, return the indices of that slide
  3432. if( slide ) {
  3433. var isVertical = isVerticalSlide( slide );
  3434. var slideh = isVertical ? slide.parentNode : slide;
  3435. // Select all horizontal slides
  3436. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3437. // Now that we know which the horizontal slide is, get its index
  3438. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  3439. // Assume we're not vertical
  3440. v = undefined;
  3441. // If this is a vertical slide, grab the vertical index
  3442. if( isVertical ) {
  3443. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  3444. }
  3445. }
  3446. if( !slide && currentSlide ) {
  3447. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  3448. if( hasFragments ) {
  3449. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  3450. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  3451. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  3452. }
  3453. else {
  3454. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  3455. }
  3456. }
  3457. }
  3458. return { h: h, v: v, f: f };
  3459. }
  3460. /**
  3461. * Retrieves all slides in this presentation.
  3462. */
  3463. function getSlides() {
  3464. return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ));
  3465. }
  3466. /**
  3467. * Returns an array of objects where each object represents the
  3468. * attributes on its respective slide.
  3469. */
  3470. function getSlidesAttributes() {
  3471. return getSlides().map( function( slide ) {
  3472. var attributes = {};
  3473. for( var i = 0; i < slide.attributes.length; i++ ) {
  3474. var attribute = slide.attributes[ i ];
  3475. attributes[ attribute.name ] = attribute.value;
  3476. }
  3477. return attributes;
  3478. } );
  3479. }
  3480. /**
  3481. * Retrieves the total number of slides in this presentation.
  3482. *
  3483. * @return {number}
  3484. */
  3485. function getTotalSlides() {
  3486. return getSlides().length;
  3487. }
  3488. /**
  3489. * Returns the slide element matching the specified index.
  3490. *
  3491. * @return {HTMLElement}
  3492. */
  3493. function getSlide( x, y ) {
  3494. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  3495. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  3496. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  3497. return verticalSlides ? verticalSlides[ y ] : undefined;
  3498. }
  3499. return horizontalSlide;
  3500. }
  3501. /**
  3502. * Returns the background element for the given slide.
  3503. * All slides, even the ones with no background properties
  3504. * defined, have a background element so as long as the
  3505. * index is valid an element will be returned.
  3506. *
  3507. * @param {mixed} x Horizontal background index OR a slide
  3508. * HTML element
  3509. * @param {number} y Vertical background index
  3510. * @return {(HTMLElement[]|*)}
  3511. */
  3512. function getSlideBackground( x, y ) {
  3513. var slide = typeof x === 'number' ? getSlide( x, y ) : x;
  3514. if( slide ) {
  3515. return slide.slideBackgroundElement;
  3516. }
  3517. return undefined;
  3518. }
  3519. /**
  3520. * Retrieves the speaker notes from a slide. Notes can be
  3521. * defined in two ways:
  3522. * 1. As a data-notes attribute on the slide <section>
  3523. * 2. As an <aside class="notes"> inside of the slide
  3524. *
  3525. * @param {HTMLElement} [slide=currentSlide]
  3526. * @return {(string|null)}
  3527. */
  3528. function getSlideNotes( slide ) {
  3529. // Default to the current slide
  3530. slide = slide || currentSlide;
  3531. // Notes can be specified via the data-notes attribute...
  3532. if( slide.hasAttribute( 'data-notes' ) ) {
  3533. return slide.getAttribute( 'data-notes' );
  3534. }
  3535. // ... or using an <aside class="notes"> element
  3536. var notesElement = slide.querySelector( 'aside.notes' );
  3537. if( notesElement ) {
  3538. return notesElement.innerHTML;
  3539. }
  3540. return null;
  3541. }
  3542. /**
  3543. * Retrieves the current state of the presentation as
  3544. * an object. This state can then be restored at any
  3545. * time.
  3546. *
  3547. * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
  3548. */
  3549. function getState() {
  3550. var indices = getIndices();
  3551. return {
  3552. indexh: indices.h,
  3553. indexv: indices.v,
  3554. indexf: indices.f,
  3555. paused: isPaused(),
  3556. overview: isOverview()
  3557. };
  3558. }
  3559. /**
  3560. * Restores the presentation to the given state.
  3561. *
  3562. * @param {object} state As generated by getState()
  3563. * @see {@link getState} generates the parameter `state`
  3564. */
  3565. function setState( state ) {
  3566. if( typeof state === 'object' ) {
  3567. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  3568. var pausedFlag = deserialize( state.paused ),
  3569. overviewFlag = deserialize( state.overview );
  3570. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  3571. togglePause( pausedFlag );
  3572. }
  3573. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  3574. toggleOverview( overviewFlag );
  3575. }
  3576. }
  3577. }
  3578. /**
  3579. * Return a sorted fragments list, ordered by an increasing
  3580. * "data-fragment-index" attribute.
  3581. *
  3582. * Fragments will be revealed in the order that they are returned by
  3583. * this function, so you can use the index attributes to control the
  3584. * order of fragment appearance.
  3585. *
  3586. * To maintain a sensible default fragment order, fragments are presumed
  3587. * to be passed in document order. This function adds a "fragment-index"
  3588. * attribute to each node if such an attribute is not already present,
  3589. * and sets that attribute to an integer value which is the position of
  3590. * the fragment within the fragments list.
  3591. *
  3592. * @param {object[]|*} fragments
  3593. * @param {boolean} grouped If true the returned array will contain
  3594. * nested arrays for all fragments with the same index
  3595. * @return {object[]} sorted Sorted array of fragments
  3596. */
  3597. function sortFragments( fragments, grouped ) {
  3598. fragments = toArray( fragments );
  3599. var ordered = [],
  3600. unordered = [],
  3601. sorted = [];
  3602. // Group ordered and unordered elements
  3603. fragments.forEach( function( fragment, i ) {
  3604. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  3605. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  3606. if( !ordered[index] ) {
  3607. ordered[index] = [];
  3608. }
  3609. ordered[index].push( fragment );
  3610. }
  3611. else {
  3612. unordered.push( [ fragment ] );
  3613. }
  3614. } );
  3615. // Append fragments without explicit indices in their
  3616. // DOM order
  3617. ordered = ordered.concat( unordered );
  3618. // Manually count the index up per group to ensure there
  3619. // are no gaps
  3620. var index = 0;
  3621. // Push all fragments in their sorted order to an array,
  3622. // this flattens the groups
  3623. ordered.forEach( function( group ) {
  3624. group.forEach( function( fragment ) {
  3625. sorted.push( fragment );
  3626. fragment.setAttribute( 'data-fragment-index', index );
  3627. } );
  3628. index ++;
  3629. } );
  3630. return grouped === true ? ordered : sorted;
  3631. }
  3632. /**
  3633. * Refreshes the fragments on the current slide so that they
  3634. * have the appropriate classes (.visible + .current-fragment).
  3635. *
  3636. * @param {number} [index] The index of the current fragment
  3637. * @param {array} [fragments] Array containing all fragments
  3638. * in the current slide
  3639. *
  3640. * @return {{shown: array, hidden: array}}
  3641. */
  3642. function updateFragments( index, fragments ) {
  3643. var changedFragments = {
  3644. shown: [],
  3645. hidden: []
  3646. };
  3647. if( currentSlide && config.fragments ) {
  3648. fragments = fragments || sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3649. if( fragments.length ) {
  3650. if( typeof index !== 'number' ) {
  3651. var currentFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3652. if( currentFragment ) {
  3653. index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3654. }
  3655. }
  3656. toArray( fragments ).forEach( function( el, i ) {
  3657. if( el.hasAttribute( 'data-fragment-index' ) ) {
  3658. i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
  3659. }
  3660. // Visible fragments
  3661. if( i <= index ) {
  3662. if( !el.classList.contains( 'visible' ) ) changedFragments.shown.push( el );
  3663. el.classList.add( 'visible' );
  3664. el.classList.remove( 'current-fragment' );
  3665. // Announce the fragments one by one to the Screen Reader
  3666. dom.statusDiv.textContent = getStatusText( el );
  3667. if( i === index ) {
  3668. el.classList.add( 'current-fragment' );
  3669. startEmbeddedContent( el );
  3670. }
  3671. }
  3672. // Hidden fragments
  3673. else {
  3674. if( el.classList.contains( 'visible' ) ) changedFragments.hidden.push( el );
  3675. el.classList.remove( 'visible' );
  3676. el.classList.remove( 'current-fragment' );
  3677. }
  3678. } );
  3679. }
  3680. }
  3681. return changedFragments;
  3682. }
  3683. /**
  3684. * Navigate to the specified slide fragment.
  3685. *
  3686. * @param {?number} index The index of the fragment that
  3687. * should be shown, -1 means all are invisible
  3688. * @param {number} offset Integer offset to apply to the
  3689. * fragment index
  3690. *
  3691. * @return {boolean} true if a change was made in any
  3692. * fragments visibility as part of this call
  3693. */
  3694. function navigateFragment( index, offset ) {
  3695. if( currentSlide && config.fragments ) {
  3696. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3697. if( fragments.length ) {
  3698. // If no index is specified, find the current
  3699. if( typeof index !== 'number' ) {
  3700. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3701. if( lastVisibleFragment ) {
  3702. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3703. }
  3704. else {
  3705. index = -1;
  3706. }
  3707. }
  3708. // If an offset is specified, apply it to the index
  3709. if( typeof offset === 'number' ) {
  3710. index += offset;
  3711. }
  3712. var changedFragments = updateFragments( index, fragments );
  3713. if( changedFragments.hidden.length ) {
  3714. dispatchEvent( 'fragmenthidden', { fragment: changedFragments.hidden[0], fragments: changedFragments.hidden } );
  3715. }
  3716. if( changedFragments.shown.length ) {
  3717. dispatchEvent( 'fragmentshown', { fragment: changedFragments.shown[0], fragments: changedFragments.shown } );
  3718. }
  3719. updateControls();
  3720. updateProgress();
  3721. if( config.fragmentInURL ) {
  3722. writeURL();
  3723. }
  3724. return !!( changedFragments.shown.length || changedFragments.hidden.length );
  3725. }
  3726. }
  3727. return false;
  3728. }
  3729. /**
  3730. * Navigate to the next slide fragment.
  3731. *
  3732. * @return {boolean} true if there was a next fragment,
  3733. * false otherwise
  3734. */
  3735. function nextFragment() {
  3736. return navigateFragment( null, 1 );
  3737. }
  3738. /**
  3739. * Navigate to the previous slide fragment.
  3740. *
  3741. * @return {boolean} true if there was a previous fragment,
  3742. * false otherwise
  3743. */
  3744. function previousFragment() {
  3745. return navigateFragment( null, -1 );
  3746. }
  3747. /**
  3748. * Cues a new automated slide if enabled in the config.
  3749. */
  3750. function cueAutoSlide() {
  3751. cancelAutoSlide();
  3752. if( currentSlide && config.autoSlide !== false ) {
  3753. var fragment = currentSlide.querySelector( '.current-fragment' );
  3754. // When the slide first appears there is no "current" fragment so
  3755. // we look for a data-autoslide timing on the first fragment
  3756. if( !fragment ) fragment = currentSlide.querySelector( '.fragment' );
  3757. var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
  3758. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  3759. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  3760. // Pick value in the following priority order:
  3761. // 1. Current fragment's data-autoslide
  3762. // 2. Current slide's data-autoslide
  3763. // 3. Parent slide's data-autoslide
  3764. // 4. Global autoSlide setting
  3765. if( fragmentAutoSlide ) {
  3766. autoSlide = parseInt( fragmentAutoSlide, 10 );
  3767. }
  3768. else if( slideAutoSlide ) {
  3769. autoSlide = parseInt( slideAutoSlide, 10 );
  3770. }
  3771. else if( parentAutoSlide ) {
  3772. autoSlide = parseInt( parentAutoSlide, 10 );
  3773. }
  3774. else {
  3775. autoSlide = config.autoSlide;
  3776. }
  3777. // If there are media elements with data-autoplay,
  3778. // automatically set the autoSlide duration to the
  3779. // length of that media. Not applicable if the slide
  3780. // is divided up into fragments.
  3781. // playbackRate is accounted for in the duration.
  3782. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  3783. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3784. if( el.hasAttribute( 'data-autoplay' ) ) {
  3785. if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
  3786. autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
  3787. }
  3788. }
  3789. } );
  3790. }
  3791. // Cue the next auto-slide if:
  3792. // - There is an autoSlide value
  3793. // - Auto-sliding isn't paused by the user
  3794. // - The presentation isn't paused
  3795. // - The overview isn't active
  3796. // - The presentation isn't over
  3797. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  3798. autoSlideTimeout = setTimeout( function() {
  3799. typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
  3800. cueAutoSlide();
  3801. }, autoSlide );
  3802. autoSlideStartTime = Date.now();
  3803. }
  3804. if( autoSlidePlayer ) {
  3805. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  3806. }
  3807. }
  3808. }
  3809. /**
  3810. * Cancels any ongoing request to auto-slide.
  3811. */
  3812. function cancelAutoSlide() {
  3813. clearTimeout( autoSlideTimeout );
  3814. autoSlideTimeout = -1;
  3815. }
  3816. function pauseAutoSlide() {
  3817. if( autoSlide && !autoSlidePaused ) {
  3818. autoSlidePaused = true;
  3819. dispatchEvent( 'autoslidepaused' );
  3820. clearTimeout( autoSlideTimeout );
  3821. if( autoSlidePlayer ) {
  3822. autoSlidePlayer.setPlaying( false );
  3823. }
  3824. }
  3825. }
  3826. function resumeAutoSlide() {
  3827. if( autoSlide && autoSlidePaused ) {
  3828. autoSlidePaused = false;
  3829. dispatchEvent( 'autoslideresumed' );
  3830. cueAutoSlide();
  3831. }
  3832. }
  3833. function navigateLeft() {
  3834. // Reverse for RTL
  3835. if( config.rtl ) {
  3836. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  3837. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3838. }
  3839. }
  3840. // Normal navigation
  3841. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  3842. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3843. }
  3844. }
  3845. function navigateRight() {
  3846. hasNavigatedRight = true;
  3847. // Reverse for RTL
  3848. if( config.rtl ) {
  3849. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  3850. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3851. }
  3852. }
  3853. // Normal navigation
  3854. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  3855. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3856. }
  3857. }
  3858. function navigateUp() {
  3859. // Prioritize hiding fragments
  3860. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  3861. slide( indexh, indexv - 1 );
  3862. }
  3863. }
  3864. function navigateDown() {
  3865. hasNavigatedDown = true;
  3866. // Prioritize revealing fragments
  3867. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  3868. slide( indexh, indexv + 1 );
  3869. }
  3870. }
  3871. /**
  3872. * Navigates backwards, prioritized in the following order:
  3873. * 1) Previous fragment
  3874. * 2) Previous vertical slide
  3875. * 3) Previous horizontal slide
  3876. */
  3877. function navigatePrev() {
  3878. // Prioritize revealing fragments
  3879. if( previousFragment() === false ) {
  3880. if( availableRoutes().up ) {
  3881. navigateUp();
  3882. }
  3883. else {
  3884. // Fetch the previous horizontal slide, if there is one
  3885. var previousSlide;
  3886. if( config.rtl ) {
  3887. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  3888. }
  3889. else {
  3890. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  3891. }
  3892. if( previousSlide ) {
  3893. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  3894. var h = indexh - 1;
  3895. slide( h, v );
  3896. }
  3897. }
  3898. }
  3899. }
  3900. /**
  3901. * The reverse of #navigatePrev().
  3902. */
  3903. function navigateNext() {
  3904. hasNavigatedRight = true;
  3905. hasNavigatedDown = true;
  3906. // Prioritize revealing fragments
  3907. if( nextFragment() === false ) {
  3908. var routes = availableRoutes();
  3909. // When looping is enabled `routes.down` is always available
  3910. // so we need a separate check for when we've reached the
  3911. // end of a stack and should move horizontally
  3912. if( routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide( currentSlide ) ) {
  3913. routes.down = false;
  3914. }
  3915. if( routes.down ) {
  3916. navigateDown();
  3917. }
  3918. else if( config.rtl ) {
  3919. navigateLeft();
  3920. }
  3921. else {
  3922. navigateRight();
  3923. }
  3924. }
  3925. }
  3926. /**
  3927. * Checks if the target element prevents the triggering of
  3928. * swipe navigation.
  3929. */
  3930. function isSwipePrevented( target ) {
  3931. while( target && typeof target.hasAttribute === 'function' ) {
  3932. if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
  3933. target = target.parentNode;
  3934. }
  3935. return false;
  3936. }
  3937. // --------------------------------------------------------------------//
  3938. // ----------------------------- EVENTS -------------------------------//
  3939. // --------------------------------------------------------------------//
  3940. /**
  3941. * Called by all event handlers that are based on user
  3942. * input.
  3943. *
  3944. * @param {object} [event]
  3945. */
  3946. function onUserInput( event ) {
  3947. if( config.autoSlideStoppable ) {
  3948. pauseAutoSlide();
  3949. }
  3950. }
  3951. /**
  3952. * Called whenever there is mouse input at the document level
  3953. * to determine if the cursor is active or not.
  3954. *
  3955. * @param {object} event
  3956. */
  3957. function onDocumentCursorActive( event ) {
  3958. showCursor();
  3959. clearTimeout( cursorInactiveTimeout );
  3960. cursorInactiveTimeout = setTimeout( hideCursor, config.hideCursorTime );
  3961. }
  3962. /**
  3963. * Handler for the document level 'keypress' event.
  3964. *
  3965. * @param {object} event
  3966. */
  3967. function onDocumentKeyPress( event ) {
  3968. // Check if the pressed key is question mark
  3969. if( event.shiftKey && event.charCode === 63 ) {
  3970. toggleHelp();
  3971. }
  3972. }
  3973. /**
  3974. * Handler for the document level 'keydown' event.
  3975. *
  3976. * @param {object} event
  3977. */
  3978. function onDocumentKeyDown( event ) {
  3979. // If there's a condition specified and it returns false,
  3980. // ignore this event
  3981. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
  3982. return true;
  3983. }
  3984. // Shorthand
  3985. var keyCode = event.keyCode;
  3986. // Remember if auto-sliding was paused so we can toggle it
  3987. var autoSlideWasPaused = autoSlidePaused;
  3988. onUserInput( event );
  3989. // Is there a focused element that could be using the keyboard?
  3990. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  3991. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  3992. var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
  3993. // Whitelist specific modified + keycode combinations
  3994. var prevSlideShortcut = event.shiftKey && event.keyCode === 32;
  3995. var firstSlideShortcut = ( event.metaKey || event.ctrlKey ) && keyCode === 37;
  3996. var lastSlideShortcut = ( event.metaKey || event.ctrlKey ) && keyCode === 39;
  3997. // Prevent all other events when a modifier is pressed
  3998. var unusedModifier = !prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
  3999. ( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );
  4000. // Disregard the event if there's a focused element or a
  4001. // keyboard modifier key is present
  4002. if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;
  4003. // While paused only allow resume keyboard events; 'b', 'v', '.'
  4004. var resumeKeyCodes = [66,86,190,191];
  4005. var key;
  4006. // Custom key bindings for togglePause should be able to resume
  4007. if( typeof config.keyboard === 'object' ) {
  4008. for( key in config.keyboard ) {
  4009. if( config.keyboard[key] === 'togglePause' ) {
  4010. resumeKeyCodes.push( parseInt( key, 10 ) );
  4011. }
  4012. }
  4013. }
  4014. if( isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
  4015. return false;
  4016. }
  4017. var triggered = false;
  4018. // 1. User defined key bindings
  4019. if( typeof config.keyboard === 'object' ) {
  4020. for( key in config.keyboard ) {
  4021. // Check if this binding matches the pressed key
  4022. if( parseInt( key, 10 ) === keyCode ) {
  4023. var value = config.keyboard[ key ];
  4024. // Callback function
  4025. if( typeof value === 'function' ) {
  4026. value.apply( null, [ event ] );
  4027. }
  4028. // String shortcuts to reveal.js API
  4029. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  4030. Reveal[ value ].call();
  4031. }
  4032. triggered = true;
  4033. }
  4034. }
  4035. }
  4036. // 2. Registered custom key bindings
  4037. if( triggered === false ) {
  4038. for( key in registeredKeyBindings ) {
  4039. // Check if this binding matches the pressed key
  4040. if( parseInt( key, 10 ) === keyCode ) {
  4041. var action = registeredKeyBindings[ key ].callback;
  4042. // Callback function
  4043. if( typeof action === 'function' ) {
  4044. action.apply( null, [ event ] );
  4045. }
  4046. // String shortcuts to reveal.js API
  4047. else if( typeof action === 'string' && typeof Reveal[ action ] === 'function' ) {
  4048. Reveal[ action ].call();
  4049. }
  4050. triggered = true;
  4051. }
  4052. }
  4053. }
  4054. // 3. System defined key bindings
  4055. if( triggered === false ) {
  4056. // Assume true and try to prove false
  4057. triggered = true;
  4058. // P, PAGE UP
  4059. if( keyCode === 80 || keyCode === 33 ) {
  4060. navigatePrev();
  4061. }
  4062. // N, PAGE DOWN
  4063. else if( keyCode === 78 || keyCode === 34 ) {
  4064. navigateNext();
  4065. }
  4066. // H, LEFT
  4067. else if( keyCode === 72 || keyCode === 37 ) {
  4068. if( firstSlideShortcut ) {
  4069. slide( 0 );
  4070. }
  4071. else if( !isOverview() && config.navigationMode === 'linear' ) {
  4072. navigatePrev();
  4073. }
  4074. else {
  4075. navigateLeft();
  4076. }
  4077. }
  4078. // L, RIGHT
  4079. else if( keyCode === 76 || keyCode === 39 ) {
  4080. if( lastSlideShortcut ) {
  4081. slide( Number.MAX_VALUE );
  4082. }
  4083. else if( !isOverview() && config.navigationMode === 'linear' ) {
  4084. navigateNext();
  4085. }
  4086. else {
  4087. navigateRight();
  4088. }
  4089. }
  4090. // K, UP
  4091. else if( keyCode === 75 || keyCode === 38 ) {
  4092. if( !isOverview() && config.navigationMode === 'linear' ) {
  4093. navigatePrev();
  4094. }
  4095. else {
  4096. navigateUp();
  4097. }
  4098. }
  4099. // J, DOWN
  4100. else if( keyCode === 74 || keyCode === 40 ) {
  4101. if( !isOverview() && config.navigationMode === 'linear' ) {
  4102. navigateNext();
  4103. }
  4104. else {
  4105. navigateDown();
  4106. }
  4107. }
  4108. // HOME
  4109. else if( keyCode === 36 ) {
  4110. slide( 0 );
  4111. }
  4112. // END
  4113. else if( keyCode === 35 ) {
  4114. slide( Number.MAX_VALUE );
  4115. }
  4116. // SPACE
  4117. else if( keyCode === 32 ) {
  4118. if( isOverview() ) {
  4119. deactivateOverview();
  4120. }
  4121. if( event.shiftKey ) {
  4122. navigatePrev();
  4123. }
  4124. else {
  4125. navigateNext();
  4126. }
  4127. }
  4128. // TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS "BLACK SCREEN" BUTTON
  4129. else if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {
  4130. togglePause();
  4131. }
  4132. // F
  4133. else if( keyCode === 70 ) {
  4134. enterFullscreen();
  4135. }
  4136. // A
  4137. else if( keyCode === 65 ) {
  4138. if ( config.autoSlideStoppable ) {
  4139. toggleAutoSlide( autoSlideWasPaused );
  4140. }
  4141. }
  4142. else {
  4143. triggered = false;
  4144. }
  4145. }
  4146. // If the input resulted in a triggered action we should prevent
  4147. // the browsers default behavior
  4148. if( triggered ) {
  4149. event.preventDefault && event.preventDefault();
  4150. }
  4151. // ESC or O key
  4152. else if ( ( keyCode === 27 || keyCode === 79 ) && features.transforms3d ) {
  4153. if( dom.overlay ) {
  4154. closeOverlay();
  4155. }
  4156. else {
  4157. toggleOverview();
  4158. }
  4159. event.preventDefault && event.preventDefault();
  4160. }
  4161. // If auto-sliding is enabled we need to cue up
  4162. // another timeout
  4163. cueAutoSlide();
  4164. }
  4165. /**
  4166. * Handler for the 'touchstart' event, enables support for
  4167. * swipe and pinch gestures.
  4168. *
  4169. * @param {object} event
  4170. */
  4171. function onTouchStart( event ) {
  4172. if( isSwipePrevented( event.target ) ) return true;
  4173. touch.startX = event.touches[0].clientX;
  4174. touch.startY = event.touches[0].clientY;
  4175. touch.startCount = event.touches.length;
  4176. }
  4177. /**
  4178. * Handler for the 'touchmove' event.
  4179. *
  4180. * @param {object} event
  4181. */
  4182. function onTouchMove( event ) {
  4183. if( isSwipePrevented( event.target ) ) return true;
  4184. // Each touch should only trigger one action
  4185. if( !touch.captured ) {
  4186. onUserInput( event );
  4187. var currentX = event.touches[0].clientX;
  4188. var currentY = event.touches[0].clientY;
  4189. // There was only one touch point, look for a swipe
  4190. if( event.touches.length === 1 && touch.startCount !== 2 ) {
  4191. var deltaX = currentX - touch.startX,
  4192. deltaY = currentY - touch.startY;
  4193. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4194. touch.captured = true;
  4195. navigateLeft();
  4196. }
  4197. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4198. touch.captured = true;
  4199. navigateRight();
  4200. }
  4201. else if( deltaY > touch.threshold ) {
  4202. touch.captured = true;
  4203. navigateUp();
  4204. }
  4205. else if( deltaY < -touch.threshold ) {
  4206. touch.captured = true;
  4207. navigateDown();
  4208. }
  4209. // If we're embedded, only block touch events if they have
  4210. // triggered an action
  4211. if( config.embedded ) {
  4212. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  4213. event.preventDefault();
  4214. }
  4215. }
  4216. // Not embedded? Block them all to avoid needless tossing
  4217. // around of the viewport in iOS
  4218. else {
  4219. event.preventDefault();
  4220. }
  4221. }
  4222. }
  4223. // There's a bug with swiping on some Android devices unless
  4224. // the default action is always prevented
  4225. else if( UA.match( /android/gi ) ) {
  4226. event.preventDefault();
  4227. }
  4228. }
  4229. /**
  4230. * Handler for the 'touchend' event.
  4231. *
  4232. * @param {object} event
  4233. */
  4234. function onTouchEnd( event ) {
  4235. touch.captured = false;
  4236. }
  4237. /**
  4238. * Convert pointer down to touch start.
  4239. *
  4240. * @param {object} event
  4241. */
  4242. function onPointerDown( event ) {
  4243. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4244. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4245. onTouchStart( event );
  4246. }
  4247. }
  4248. /**
  4249. * Convert pointer move to touch move.
  4250. *
  4251. * @param {object} event
  4252. */
  4253. function onPointerMove( event ) {
  4254. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4255. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4256. onTouchMove( event );
  4257. }
  4258. }
  4259. /**
  4260. * Convert pointer up to touch end.
  4261. *
  4262. * @param {object} event
  4263. */
  4264. function onPointerUp( event ) {
  4265. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4266. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4267. onTouchEnd( event );
  4268. }
  4269. }
  4270. /**
  4271. * Handles mouse wheel scrolling, throttled to avoid skipping
  4272. * multiple slides.
  4273. *
  4274. * @param {object} event
  4275. */
  4276. function onDocumentMouseScroll( event ) {
  4277. if( Date.now() - lastMouseWheelStep > 600 ) {
  4278. lastMouseWheelStep = Date.now();
  4279. var delta = event.detail || -event.wheelDelta;
  4280. if( delta > 0 ) {
  4281. navigateNext();
  4282. }
  4283. else if( delta < 0 ) {
  4284. navigatePrev();
  4285. }
  4286. }
  4287. }
  4288. /**
  4289. * Clicking on the progress bar results in a navigation to the
  4290. * closest approximate horizontal slide using this equation:
  4291. *
  4292. * ( clickX / presentationWidth ) * numberOfSlides
  4293. *
  4294. * @param {object} event
  4295. */
  4296. function onProgressClicked( event ) {
  4297. onUserInput( event );
  4298. event.preventDefault();
  4299. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  4300. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  4301. if( config.rtl ) {
  4302. slideIndex = slidesTotal - slideIndex;
  4303. }
  4304. slide( slideIndex );
  4305. }
  4306. /**
  4307. * Event handler for navigation control buttons.
  4308. */
  4309. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigatePrev() : navigateLeft(); }
  4310. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigateNext() : navigateRight(); }
  4311. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  4312. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  4313. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  4314. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  4315. /**
  4316. * Handler for the window level 'hashchange' event.
  4317. *
  4318. * @param {object} [event]
  4319. */
  4320. function onWindowHashChange( event ) {
  4321. readURL();
  4322. }
  4323. /**
  4324. * Handler for the window level 'resize' event.
  4325. *
  4326. * @param {object} [event]
  4327. */
  4328. function onWindowResize( event ) {
  4329. layout();
  4330. }
  4331. /**
  4332. * Handle for the window level 'visibilitychange' event.
  4333. *
  4334. * @param {object} [event]
  4335. */
  4336. function onPageVisibilityChange( event ) {
  4337. var isHidden = document.webkitHidden ||
  4338. document.msHidden ||
  4339. document.hidden;
  4340. // If, after clicking a link or similar and we're coming back,
  4341. // focus the document.body to ensure we can use keyboard shortcuts
  4342. if( isHidden === false && document.activeElement !== document.body ) {
  4343. // Not all elements support .blur() - SVGs among them.
  4344. if( typeof document.activeElement.blur === 'function' ) {
  4345. document.activeElement.blur();
  4346. }
  4347. document.body.focus();
  4348. }
  4349. }
  4350. /**
  4351. * Invoked when a slide is and we're in the overview.
  4352. *
  4353. * @param {object} event
  4354. */
  4355. function onOverviewSlideClicked( event ) {
  4356. // TODO There's a bug here where the event listeners are not
  4357. // removed after deactivating the overview.
  4358. if( eventsAreBound && isOverview() ) {
  4359. event.preventDefault();
  4360. var element = event.target;
  4361. while( element && !element.nodeName.match( /section/gi ) ) {
  4362. element = element.parentNode;
  4363. }
  4364. if( element && !element.classList.contains( 'disabled' ) ) {
  4365. deactivateOverview();
  4366. if( element.nodeName.match( /section/gi ) ) {
  4367. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  4368. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  4369. slide( h, v );
  4370. }
  4371. }
  4372. }
  4373. }
  4374. /**
  4375. * Handles clicks on links that are set to preview in the
  4376. * iframe overlay.
  4377. *
  4378. * @param {object} event
  4379. */
  4380. function onPreviewLinkClicked( event ) {
  4381. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  4382. var url = event.currentTarget.getAttribute( 'href' );
  4383. if( url ) {
  4384. showPreview( url );
  4385. event.preventDefault();
  4386. }
  4387. }
  4388. }
  4389. /**
  4390. * Handles click on the auto-sliding controls element.
  4391. *
  4392. * @param {object} [event]
  4393. */
  4394. function onAutoSlidePlayerClick( event ) {
  4395. // Replay
  4396. if( Reveal.isLastSlide() && config.loop === false ) {
  4397. slide( 0, 0 );
  4398. resumeAutoSlide();
  4399. }
  4400. // Resume
  4401. else if( autoSlidePaused ) {
  4402. resumeAutoSlide();
  4403. }
  4404. // Pause
  4405. else {
  4406. pauseAutoSlide();
  4407. }
  4408. }
  4409. // --------------------------------------------------------------------//
  4410. // ------------------------ PLAYBACK COMPONENT ------------------------//
  4411. // --------------------------------------------------------------------//
  4412. /**
  4413. * Constructor for the playback component, which displays
  4414. * play/pause/progress controls.
  4415. *
  4416. * @param {HTMLElement} container The component will append
  4417. * itself to this
  4418. * @param {function} progressCheck A method which will be
  4419. * called frequently to get the current progress on a range
  4420. * of 0-1
  4421. */
  4422. function Playback( container, progressCheck ) {
  4423. // Cosmetics
  4424. this.diameter = 100;
  4425. this.diameter2 = this.diameter/2;
  4426. this.thickness = 6;
  4427. // Flags if we are currently playing
  4428. this.playing = false;
  4429. // Current progress on a 0-1 range
  4430. this.progress = 0;
  4431. // Used to loop the animation smoothly
  4432. this.progressOffset = 1;
  4433. this.container = container;
  4434. this.progressCheck = progressCheck;
  4435. this.canvas = document.createElement( 'canvas' );
  4436. this.canvas.className = 'playback';
  4437. this.canvas.width = this.diameter;
  4438. this.canvas.height = this.diameter;
  4439. this.canvas.style.width = this.diameter2 + 'px';
  4440. this.canvas.style.height = this.diameter2 + 'px';
  4441. this.context = this.canvas.getContext( '2d' );
  4442. this.container.appendChild( this.canvas );
  4443. this.render();
  4444. }
  4445. /**
  4446. * @param value
  4447. */
  4448. Playback.prototype.setPlaying = function( value ) {
  4449. var wasPlaying = this.playing;
  4450. this.playing = value;
  4451. // Start repainting if we weren't already
  4452. if( !wasPlaying && this.playing ) {
  4453. this.animate();
  4454. }
  4455. else {
  4456. this.render();
  4457. }
  4458. };
  4459. Playback.prototype.animate = function() {
  4460. var progressBefore = this.progress;
  4461. this.progress = this.progressCheck();
  4462. // When we loop, offset the progress so that it eases
  4463. // smoothly rather than immediately resetting
  4464. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  4465. this.progressOffset = this.progress;
  4466. }
  4467. this.render();
  4468. if( this.playing ) {
  4469. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  4470. }
  4471. };
  4472. /**
  4473. * Renders the current progress and playback state.
  4474. */
  4475. Playback.prototype.render = function() {
  4476. var progress = this.playing ? this.progress : 0,
  4477. radius = ( this.diameter2 ) - this.thickness,
  4478. x = this.diameter2,
  4479. y = this.diameter2,
  4480. iconSize = 28;
  4481. // Ease towards 1
  4482. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  4483. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  4484. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  4485. this.context.save();
  4486. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  4487. // Solid background color
  4488. this.context.beginPath();
  4489. this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
  4490. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  4491. this.context.fill();
  4492. // Draw progress track
  4493. this.context.beginPath();
  4494. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  4495. this.context.lineWidth = this.thickness;
  4496. this.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';
  4497. this.context.stroke();
  4498. if( this.playing ) {
  4499. // Draw progress on top of track
  4500. this.context.beginPath();
  4501. this.context.arc( x, y, radius, startAngle, endAngle, false );
  4502. this.context.lineWidth = this.thickness;
  4503. this.context.strokeStyle = '#fff';
  4504. this.context.stroke();
  4505. }
  4506. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  4507. // Draw play/pause icons
  4508. if( this.playing ) {
  4509. this.context.fillStyle = '#fff';
  4510. this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
  4511. this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
  4512. }
  4513. else {
  4514. this.context.beginPath();
  4515. this.context.translate( 4, 0 );
  4516. this.context.moveTo( 0, 0 );
  4517. this.context.lineTo( iconSize - 4, iconSize / 2 );
  4518. this.context.lineTo( 0, iconSize );
  4519. this.context.fillStyle = '#fff';
  4520. this.context.fill();
  4521. }
  4522. this.context.restore();
  4523. };
  4524. Playback.prototype.on = function( type, listener ) {
  4525. this.canvas.addEventListener( type, listener, false );
  4526. };
  4527. Playback.prototype.off = function( type, listener ) {
  4528. this.canvas.removeEventListener( type, listener, false );
  4529. };
  4530. Playback.prototype.destroy = function() {
  4531. this.playing = false;
  4532. if( this.canvas.parentNode ) {
  4533. this.container.removeChild( this.canvas );
  4534. }
  4535. };
  4536. // --------------------------------------------------------------------//
  4537. // ------------------------------- API --------------------------------//
  4538. // --------------------------------------------------------------------//
  4539. Reveal = {
  4540. VERSION: VERSION,
  4541. initialize: initialize,
  4542. configure: configure,
  4543. sync: sync,
  4544. syncSlide: syncSlide,
  4545. syncFragments: syncFragments,
  4546. // Navigation methods
  4547. slide: slide,
  4548. left: navigateLeft,
  4549. right: navigateRight,
  4550. up: navigateUp,
  4551. down: navigateDown,
  4552. prev: navigatePrev,
  4553. next: navigateNext,
  4554. // Fragment methods
  4555. navigateFragment: navigateFragment,
  4556. prevFragment: previousFragment,
  4557. nextFragment: nextFragment,
  4558. // Deprecated aliases
  4559. navigateTo: slide,
  4560. navigateLeft: navigateLeft,
  4561. navigateRight: navigateRight,
  4562. navigateUp: navigateUp,
  4563. navigateDown: navigateDown,
  4564. navigatePrev: navigatePrev,
  4565. navigateNext: navigateNext,
  4566. // Forces an update in slide layout
  4567. layout: layout,
  4568. // Randomizes the order of slides
  4569. shuffle: shuffle,
  4570. // Returns an object with the available routes as booleans (left/right/top/bottom)
  4571. availableRoutes: availableRoutes,
  4572. // Returns an object with the available fragments as booleans (prev/next)
  4573. availableFragments: availableFragments,
  4574. // Toggles a help overlay with keyboard shortcuts
  4575. toggleHelp: toggleHelp,
  4576. // Toggles the overview mode on/off
  4577. toggleOverview: toggleOverview,
  4578. // Toggles the "black screen" mode on/off
  4579. togglePause: togglePause,
  4580. // Toggles the auto slide mode on/off
  4581. toggleAutoSlide: toggleAutoSlide,
  4582. // State checks
  4583. isOverview: isOverview,
  4584. isPaused: isPaused,
  4585. isAutoSliding: isAutoSliding,
  4586. isSpeakerNotes: isSpeakerNotes,
  4587. // Slide preloading
  4588. loadSlide: loadSlide,
  4589. unloadSlide: unloadSlide,
  4590. // Adds or removes all internal event listeners (such as keyboard)
  4591. addEventListeners: addEventListeners,
  4592. removeEventListeners: removeEventListeners,
  4593. // Facility for persisting and restoring the presentation state
  4594. getState: getState,
  4595. setState: setState,
  4596. // Presentation progress
  4597. getSlidePastCount: getSlidePastCount,
  4598. // Presentation progress on range of 0-1
  4599. getProgress: getProgress,
  4600. // Returns the indices of the current, or specified, slide
  4601. getIndices: getIndices,
  4602. // Returns an Array of all slides
  4603. getSlides: getSlides,
  4604. // Returns an Array of objects representing the attributes on
  4605. // the slides
  4606. getSlidesAttributes: getSlidesAttributes,
  4607. // Returns the total number of slides
  4608. getTotalSlides: getTotalSlides,
  4609. // Returns the slide element at the specified index
  4610. getSlide: getSlide,
  4611. // Returns the slide background element at the specified index
  4612. getSlideBackground: getSlideBackground,
  4613. // Returns the speaker notes string for a slide, or null
  4614. getSlideNotes: getSlideNotes,
  4615. // Returns the previous slide element, may be null
  4616. getPreviousSlide: function() {
  4617. return previousSlide;
  4618. },
  4619. // Returns the current slide element
  4620. getCurrentSlide: function() {
  4621. return currentSlide;
  4622. },
  4623. // Returns the current scale of the presentation content
  4624. getScale: function() {
  4625. return scale;
  4626. },
  4627. // Returns the current configuration object
  4628. getConfig: function() {
  4629. return config;
  4630. },
  4631. // Helper method, retrieves query string as a key/value hash
  4632. getQueryHash: function() {
  4633. var query = {};
  4634. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  4635. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  4636. } );
  4637. // Basic deserialization
  4638. for( var i in query ) {
  4639. var value = query[ i ];
  4640. query[ i ] = deserialize( unescape( value ) );
  4641. }
  4642. return query;
  4643. },
  4644. // Returns the top-level DOM element
  4645. getRevealElement: function() {
  4646. return dom.wrapper || document.querySelector( '.reveal' );
  4647. },
  4648. // Returns a hash with all registered plugins
  4649. getPlugins: function() {
  4650. return plugins;
  4651. },
  4652. // Returns true if we're currently on the first slide
  4653. isFirstSlide: function() {
  4654. return ( indexh === 0 && indexv === 0 );
  4655. },
  4656. // Returns true if we're currently on the last slide
  4657. isLastSlide: function() {
  4658. if( currentSlide ) {
  4659. // Does this slide have a next sibling?
  4660. if( currentSlide.nextElementSibling ) return false;
  4661. // If it's vertical, does its parent have a next sibling?
  4662. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  4663. return true;
  4664. }
  4665. return false;
  4666. },
  4667. // Returns true if we're on the last slide in the current
  4668. // vertical stack
  4669. isLastVerticalSlide: function() {
  4670. if( currentSlide && isVerticalSlide( currentSlide ) ) {
  4671. // Does this slide have a next sibling?
  4672. if( currentSlide.nextElementSibling ) return false;
  4673. return true;
  4674. }
  4675. return false;
  4676. },
  4677. // Checks if reveal.js has been loaded and is ready for use
  4678. isReady: function() {
  4679. return loaded;
  4680. },
  4681. // Forward event binding to the reveal DOM element
  4682. addEventListener: function( type, listener, useCapture ) {
  4683. if( 'addEventListener' in window ) {
  4684. Reveal.getRevealElement().addEventListener( type, listener, useCapture );
  4685. }
  4686. },
  4687. removeEventListener: function( type, listener, useCapture ) {
  4688. if( 'addEventListener' in window ) {
  4689. Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
  4690. }
  4691. },
  4692. // Adds/removes a custom key binding
  4693. addKeyBinding: addKeyBinding,
  4694. removeKeyBinding: removeKeyBinding,
  4695. // API for registering and retrieving plugins
  4696. registerPlugin: registerPlugin,
  4697. hasPlugin: hasPlugin,
  4698. getPlugin: getPlugin,
  4699. // Programmatically triggers a keyboard event
  4700. triggerKey: function( keyCode ) {
  4701. onDocumentKeyDown( { keyCode: keyCode } );
  4702. },
  4703. // Registers a new shortcut to include in the help overlay
  4704. registerKeyboardShortcut: function( key, value ) {
  4705. keyboardShortcuts[key] = value;
  4706. }
  4707. };
  4708. return Reveal;
  4709. }));