reveal.js 164 KB

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  1. /*!
  2. * reveal.js
  3. * http://revealjs.com
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2019 Hakim El Hattab, http://hakim.se
  7. */
  8. (function( root, factory ) {
  9. if( typeof define === 'function' && define.amd ) {
  10. // AMD. Register as an anonymous module.
  11. define( function() {
  12. root.Reveal = factory();
  13. return root.Reveal;
  14. } );
  15. } else if( typeof exports === 'object' ) {
  16. // Node. Does not work with strict CommonJS.
  17. module.exports = factory();
  18. } else {
  19. // Browser globals.
  20. root.Reveal = factory();
  21. }
  22. }( this, function() {
  23. 'use strict';
  24. var Reveal;
  25. // The reveal.js version
  26. var VERSION = '3.7.0';
  27. var SLIDES_SELECTOR = '.slides section',
  28. HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
  29. VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
  30. HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
  31. UA = navigator.userAgent,
  32. // Configuration defaults, can be overridden at initialization time
  33. config = {
  34. // The "normal" size of the presentation, aspect ratio will be preserved
  35. // when the presentation is scaled to fit different resolutions
  36. width: 960,
  37. height: 700,
  38. // Factor of the display size that should remain empty around the content
  39. margin: 0.04,
  40. // Bounds for smallest/largest possible scale to apply to content
  41. minScale: 0.2,
  42. maxScale: 2.0,
  43. // Display presentation control arrows
  44. controls: true,
  45. // Help the user learn the controls by providing hints, for example by
  46. // bouncing the down arrow when they first encounter a vertical slide
  47. controlsTutorial: true,
  48. // Determines where controls appear, "edges" or "bottom-right"
  49. controlsLayout: 'bottom-right',
  50. // Visibility rule for backwards navigation arrows; "faded", "hidden"
  51. // or "visible"
  52. controlsBackArrows: 'faded',
  53. // Display a presentation progress bar
  54. progress: true,
  55. // Display the page number of the current slide
  56. // - true: Show slide number
  57. // - false: Hide slide number
  58. //
  59. // Can optionally be set as a string that specifies the number formatting:
  60. // - "h.v": Horizontal . vertical slide number (default)
  61. // - "h/v": Horizontal / vertical slide number
  62. // - "c": Flattened slide number
  63. // - "c/t": Flattened slide number / total slides
  64. //
  65. // Alternatively, you can provide a function that returns the slide
  66. // number for the current slide. The function needs to return an array
  67. // with one string [slideNumber] or three strings [n1,delimiter,n2].
  68. // See #formatSlideNumber().
  69. slideNumber: false,
  70. // Can be used to limit the contexts in which the slide number appears
  71. // - "all": Always show the slide number
  72. // - "print": Only when printing to PDF
  73. // - "speaker": Only in the speaker view
  74. showSlideNumber: 'all',
  75. // Use 1 based indexing for # links to match slide number (default is zero
  76. // based)
  77. hashOneBasedIndex: false,
  78. // Add the current slide number to the URL hash so that reloading the
  79. // page/copying the URL will return you to the same slide
  80. hash: false,
  81. // Push each slide change to the browser history. Implies `hash: true`
  82. history: false,
  83. // Enable keyboard shortcuts for navigation
  84. keyboard: true,
  85. // Optional function that blocks keyboard events when retuning false
  86. keyboardCondition: null,
  87. // Enable the slide overview mode
  88. overview: true,
  89. // Disables the default reveal.js slide layout so that you can use
  90. // custom CSS layout
  91. disableLayout: false,
  92. // Vertical centering of slides
  93. center: true,
  94. // Enables touch navigation on devices with touch input
  95. touch: true,
  96. // Loop the presentation
  97. loop: false,
  98. // Change the presentation direction to be RTL
  99. rtl: false,
  100. // Changes the behavior of our navigation directions.
  101. //
  102. // "default"
  103. // Left/right arrow keys step between horizontal slides, up/down
  104. // arrow keys step between vertical slides. Space key steps through
  105. // all slides (both horizontal and vertical).
  106. //
  107. // "linear"
  108. // Removes the up/down arrows. Left/right arrows step through all
  109. // slides (both horizontal and vertical).
  110. //
  111. // "grid"
  112. // When this is enabled, stepping left/right from a vertical stack
  113. // to an adjacent vertical stack will land you at the same vertical
  114. // index.
  115. //
  116. // Consider a deck with six slides ordered in two vertical stacks:
  117. // 1.1 2.1
  118. // 1.2 2.2
  119. // 1.3 2.3
  120. //
  121. // If you're on slide 1.3 and navigate right, you will normally move
  122. // from 1.3 -> 2.1. With "gridNavigation" enabled the same navigation
  123. // takes you from 1.3 -> 2.3.
  124. navigationMode: 'default',
  125. // Randomizes the order of slides each time the presentation loads
  126. shuffle: false,
  127. // Turns fragments on and off globally
  128. fragments: true,
  129. // Flags whether to include the current fragment in the URL,
  130. // so that reloading brings you to the same fragment position
  131. fragmentInURL: false,
  132. // Flags if the presentation is running in an embedded mode,
  133. // i.e. contained within a limited portion of the screen
  134. embedded: false,
  135. // Flags if we should show a help overlay when the question-mark
  136. // key is pressed
  137. help: true,
  138. // Flags if it should be possible to pause the presentation (blackout)
  139. pause: true,
  140. // Flags if speaker notes should be visible to all viewers
  141. showNotes: false,
  142. // Global override for autolaying embedded media (video/audio/iframe)
  143. // - null: Media will only autoplay if data-autoplay is present
  144. // - true: All media will autoplay, regardless of individual setting
  145. // - false: No media will autoplay, regardless of individual setting
  146. autoPlayMedia: null,
  147. // 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. // Holds information about the keyboard shortcuts
  288. keyboardShortcuts = {
  289. 'N , SPACE': 'Next slide',
  290. 'P': 'Previous slide',
  291. '← , H': 'Navigate left',
  292. '→ , L': 'Navigate right',
  293. '↑ , K': 'Navigate up',
  294. '↓ , J': 'Navigate down',
  295. 'Home , ⌘/CTRL ←': 'First slide',
  296. 'End , ⌘/CTRL →': 'Last slide',
  297. 'B , .': 'Pause',
  298. 'F': 'Fullscreen',
  299. 'ESC, O': 'Slide overview'
  300. },
  301. // Holds custom key code mappings
  302. registeredKeyBindings = {};
  303. /**
  304. * Starts up the presentation if the client is capable.
  305. */
  306. function initialize( options ) {
  307. // Make sure we only initialize once
  308. if( initialized === true ) return;
  309. initialized = true;
  310. checkCapabilities();
  311. if( !features.transforms2d && !features.transforms3d ) {
  312. document.body.setAttribute( 'class', 'no-transforms' );
  313. // Since JS won't be running any further, we load all lazy
  314. // loading elements upfront
  315. var images = toArray( document.getElementsByTagName( 'img' ) ),
  316. iframes = toArray( document.getElementsByTagName( 'iframe' ) );
  317. var lazyLoadable = images.concat( iframes );
  318. for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
  319. var element = lazyLoadable[i];
  320. if( element.getAttribute( 'data-src' ) ) {
  321. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  322. element.removeAttribute( 'data-src' );
  323. }
  324. }
  325. // If the browser doesn't support core features we won't be
  326. // using JavaScript to control the presentation
  327. return;
  328. }
  329. // Cache references to key DOM elements
  330. dom.wrapper = document.querySelector( '.reveal' );
  331. dom.slides = document.querySelector( '.reveal .slides' );
  332. // Force a layout when the whole page, incl fonts, has loaded
  333. window.addEventListener( 'load', layout, false );
  334. var query = Reveal.getQueryHash();
  335. // Do not accept new dependencies via query config to avoid
  336. // the potential of malicious script injection
  337. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  338. // Copy options over to our config object
  339. extend( config, options );
  340. extend( config, query );
  341. // Hide the address bar in mobile browsers
  342. hideAddressBar();
  343. // Loads dependencies and continues to #start() once done
  344. load();
  345. }
  346. /**
  347. * Inspect the client to see what it's capable of, this
  348. * should only happens once per runtime.
  349. */
  350. function checkCapabilities() {
  351. isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA );
  352. isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
  353. var testElement = document.createElement( 'div' );
  354. features.transforms3d = 'WebkitPerspective' in testElement.style ||
  355. 'MozPerspective' in testElement.style ||
  356. 'msPerspective' in testElement.style ||
  357. 'OPerspective' in testElement.style ||
  358. 'perspective' in testElement.style;
  359. features.transforms2d = 'WebkitTransform' in testElement.style ||
  360. 'MozTransform' in testElement.style ||
  361. 'msTransform' in testElement.style ||
  362. 'OTransform' in testElement.style ||
  363. 'transform' in testElement.style;
  364. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  365. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  366. features.canvas = !!document.createElement( 'canvas' ).getContext;
  367. // Transitions in the overview are disabled in desktop and
  368. // Safari due to lag
  369. features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );
  370. // Flags if we should use zoom instead of transform to scale
  371. // up slides. Zoom produces crisper results but has a lot of
  372. // xbrowser quirks so we only use it in whitelsited browsers.
  373. features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
  374. ( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
  375. }
  376. /**
  377. * Loads the dependencies of reveal.js. Dependencies are
  378. * defined via the configuration option 'dependencies'
  379. * and will be loaded prior to starting/binding reveal.js.
  380. * Some dependencies may have an 'async' flag, if so they
  381. * will load after reveal.js has been started up.
  382. */
  383. function load() {
  384. var scripts = [],
  385. scriptsToLoad = 0;
  386. config.dependencies.forEach( function( s ) {
  387. // Load if there's no condition or the condition is truthy
  388. if( !s.condition || s.condition() ) {
  389. if( s.async ) {
  390. asyncDependencies.push( s );
  391. }
  392. else {
  393. scripts.push( s );
  394. }
  395. }
  396. } );
  397. if( scripts.length ) {
  398. scriptsToLoad = scripts.length;
  399. // Load synchronous scripts
  400. scripts.forEach( function( s ) {
  401. loadScript( s.src, function() {
  402. if( typeof s.callback === 'function' ) s.callback();
  403. if( --scriptsToLoad === 0 ) {
  404. initPlugins();
  405. }
  406. } );
  407. } );
  408. }
  409. else {
  410. initPlugins();
  411. }
  412. }
  413. /**
  414. * Initializes our plugins and waits for them to be ready
  415. * before proceeding.
  416. */
  417. function initPlugins() {
  418. var pluginsToInitialize = Object.keys( plugins ).length;
  419. // If there are no plugins, skip this step
  420. if( pluginsToInitialize === 0 ) {
  421. loadAsyncDependencies();
  422. }
  423. // ... otherwise initialize plugins
  424. else {
  425. var afterPlugInitialized = function() {
  426. if( --pluginsToInitialize === 0 ) {
  427. loadAsyncDependencies();
  428. }
  429. };
  430. for( var i in plugins ) {
  431. var plugin = plugins[i];
  432. // If the plugin has an 'init' method, invoke it
  433. if( typeof plugin.init === 'function' ) {
  434. var callback = plugin.init();
  435. // If the plugin returned a Promise, wait for it
  436. if( callback && typeof callback.then === 'function' ) {
  437. callback.then( afterPlugInitialized );
  438. }
  439. else {
  440. afterPlugInitialized();
  441. }
  442. }
  443. else {
  444. afterPlugInitialized();
  445. }
  446. }
  447. }
  448. }
  449. /**
  450. * Loads all async reveal.js dependencies.
  451. */
  452. function loadAsyncDependencies() {
  453. if( asyncDependencies.length ) {
  454. asyncDependencies.forEach( function( s ) {
  455. loadScript( s.src, s.callback );
  456. } );
  457. }
  458. start();
  459. }
  460. /**
  461. * Loads a JavaScript file from the given URL and executes it.
  462. *
  463. * @param {string} url Address of the .js file to load
  464. * @param {function} callback Method to invoke when the script
  465. * has loaded and executed
  466. */
  467. function loadScript( url, callback ) {
  468. var script = document.createElement( 'script' );
  469. script.type = 'text/javascript';
  470. script.async = false;
  471. script.defer = false;
  472. script.src = url;
  473. if( callback ) {
  474. // Success callback
  475. script.onload = script.onreadystatechange = function( event ) {
  476. if( event.type === "load" || (/loaded|complete/.test( script.readyState ) ) ) {
  477. // Kill event listeners
  478. script.onload = script.onreadystatechange = script.onerror = null;
  479. callback();
  480. }
  481. };
  482. // Error callback
  483. script.onerror = function( err ) {
  484. // Kill event listeners
  485. script.onload = script.onreadystatechange = script.onerror = null;
  486. callback( new Error( 'Failed loading script: ' + script.src + '\n' + err) );
  487. };
  488. }
  489. // Append the script at the end of <head>
  490. var head = document.querySelector( 'head' );
  491. head.insertBefore( script, head.lastChild );
  492. }
  493. /**
  494. * Starts up reveal.js by binding input events and navigating
  495. * to the current URL deeplink if there is one.
  496. */
  497. function start() {
  498. loaded = true;
  499. // Make sure we've got all the DOM elements we need
  500. setupDOM();
  501. // Listen to messages posted to this window
  502. setupPostMessage();
  503. // Prevent the slides from being scrolled out of view
  504. setupScrollPrevention();
  505. // Resets all vertical slides so that only the first is visible
  506. resetVerticalSlides();
  507. // Updates the presentation to match the current configuration values
  508. configure();
  509. // Read the initial hash
  510. readURL();
  511. // Update all backgrounds
  512. updateBackground( true );
  513. // Notify listeners that the presentation is ready but use a 1ms
  514. // timeout to ensure it's not fired synchronously after #initialize()
  515. setTimeout( function() {
  516. // Enable transitions now that we're loaded
  517. dom.slides.classList.remove( 'no-transition' );
  518. dom.wrapper.classList.add( 'ready' );
  519. dispatchEvent( 'ready', {
  520. 'indexh': indexh,
  521. 'indexv': indexv,
  522. 'currentSlide': currentSlide
  523. } );
  524. }, 1 );
  525. // Special setup and config is required when printing to PDF
  526. if( isPrintingPDF() ) {
  527. removeEventListeners();
  528. // The document needs to have loaded for the PDF layout
  529. // measurements to be accurate
  530. if( document.readyState === 'complete' ) {
  531. setupPDF();
  532. }
  533. else {
  534. window.addEventListener( 'load', setupPDF );
  535. }
  536. }
  537. }
  538. /**
  539. * Finds and stores references to DOM elements which are
  540. * required by the presentation. If a required element is
  541. * not found, it is created.
  542. */
  543. function setupDOM() {
  544. // Prevent transitions while we're loading
  545. dom.slides.classList.add( 'no-transition' );
  546. if( isMobileDevice ) {
  547. dom.wrapper.classList.add( 'no-hover' );
  548. }
  549. else {
  550. dom.wrapper.classList.remove( 'no-hover' );
  551. }
  552. if( /iphone/gi.test( UA ) ) {
  553. dom.wrapper.classList.add( 'ua-iphone' );
  554. }
  555. else {
  556. dom.wrapper.classList.remove( 'ua-iphone' );
  557. }
  558. // Background element
  559. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  560. // Progress bar
  561. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  562. dom.progressbar = dom.progress.querySelector( 'span' );
  563. // Arrow controls
  564. dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls',
  565. '<button class="navigate-left" aria-label="previous slide"><div class="controls-arrow"></div></button>' +
  566. '<button class="navigate-right" aria-label="next slide"><div class="controls-arrow"></div></button>' +
  567. '<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>' +
  568. '<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></button>' );
  569. // Slide number
  570. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  571. // Element containing notes that are visible to the audience
  572. dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
  573. dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
  574. dom.speakerNotes.setAttribute( 'tabindex', '0' );
  575. // Overlay graphic which is displayed during the paused mode
  576. dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class="resume-button">Resume presentation</button>' : null );
  577. dom.wrapper.setAttribute( 'role', 'application' );
  578. // There can be multiple instances of controls throughout the page
  579. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  580. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  581. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  582. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  583. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  584. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  585. // The right and down arrows in the standard reveal.js controls
  586. dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' );
  587. dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' );
  588. dom.statusDiv = createStatusDiv();
  589. }
  590. /**
  591. * Creates a hidden div with role aria-live to announce the
  592. * current slide content. Hide the div off-screen to make it
  593. * available only to Assistive Technologies.
  594. *
  595. * @return {HTMLElement}
  596. */
  597. function createStatusDiv() {
  598. var statusDiv = document.getElementById( 'aria-status-div' );
  599. if( !statusDiv ) {
  600. statusDiv = document.createElement( 'div' );
  601. statusDiv.style.position = 'absolute';
  602. statusDiv.style.height = '1px';
  603. statusDiv.style.width = '1px';
  604. statusDiv.style.overflow = 'hidden';
  605. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  606. statusDiv.setAttribute( 'id', 'aria-status-div' );
  607. statusDiv.setAttribute( 'aria-live', 'polite' );
  608. statusDiv.setAttribute( 'aria-atomic','true' );
  609. dom.wrapper.appendChild( statusDiv );
  610. }
  611. return statusDiv;
  612. }
  613. /**
  614. * Converts the given HTML element into a string of text
  615. * that can be announced to a screen reader. Hidden
  616. * elements are excluded.
  617. */
  618. function getStatusText( node ) {
  619. var text = '';
  620. // Text node
  621. if( node.nodeType === 3 ) {
  622. text += node.textContent;
  623. }
  624. // Element node
  625. else if( node.nodeType === 1 ) {
  626. var isAriaHidden = node.getAttribute( 'aria-hidden' );
  627. var isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
  628. if( isAriaHidden !== 'true' && !isDisplayHidden ) {
  629. toArray( node.childNodes ).forEach( function( child ) {
  630. text += getStatusText( child );
  631. } );
  632. }
  633. }
  634. return text;
  635. }
  636. /**
  637. * Configures the presentation for printing to a static
  638. * PDF.
  639. */
  640. function setupPDF() {
  641. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  642. // Dimensions of the PDF pages
  643. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  644. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  645. // Dimensions of slides within the pages
  646. var slideWidth = slideSize.width,
  647. slideHeight = slideSize.height;
  648. // Let the browser know what page size we want to print
  649. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
  650. // Limit the size of certain elements to the dimensions of the slide
  651. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  652. document.body.classList.add( 'print-pdf' );
  653. document.body.style.width = pageWidth + 'px';
  654. document.body.style.height = pageHeight + 'px';
  655. // Make sure stretch elements fit on slide
  656. layoutSlideContents( slideWidth, slideHeight );
  657. // Add each slide's index as attributes on itself, we need these
  658. // indices to generate slide numbers below
  659. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  660. hslide.setAttribute( 'data-index-h', h );
  661. if( hslide.classList.contains( 'stack' ) ) {
  662. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  663. vslide.setAttribute( 'data-index-h', h );
  664. vslide.setAttribute( 'data-index-v', v );
  665. } );
  666. }
  667. } );
  668. // Slide and slide background layout
  669. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  670. // Vertical stacks are not centred since their section
  671. // children will be
  672. if( slide.classList.contains( 'stack' ) === false ) {
  673. // Center the slide inside of the page, giving the slide some margin
  674. var left = ( pageWidth - slideWidth ) / 2,
  675. top = ( pageHeight - slideHeight ) / 2;
  676. var contentHeight = slide.scrollHeight;
  677. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  678. // Adhere to configured pages per slide limit
  679. numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
  680. // Center slides vertically
  681. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  682. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  683. }
  684. // Wrap the slide in a page element and hide its overflow
  685. // so that no page ever flows onto another
  686. var page = document.createElement( 'div' );
  687. page.className = 'pdf-page';
  688. page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
  689. slide.parentNode.insertBefore( page, slide );
  690. page.appendChild( slide );
  691. // Position the slide inside of the page
  692. slide.style.left = left + 'px';
  693. slide.style.top = top + 'px';
  694. slide.style.width = slideWidth + 'px';
  695. if( slide.slideBackgroundElement ) {
  696. page.insertBefore( slide.slideBackgroundElement, slide );
  697. }
  698. // Inject notes if `showNotes` is enabled
  699. if( config.showNotes ) {
  700. // Are there notes for this slide?
  701. var notes = getSlideNotes( slide );
  702. if( notes ) {
  703. var notesSpacing = 8;
  704. var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
  705. var notesElement = document.createElement( 'div' );
  706. notesElement.classList.add( 'speaker-notes' );
  707. notesElement.classList.add( 'speaker-notes-pdf' );
  708. notesElement.setAttribute( 'data-layout', notesLayout );
  709. notesElement.innerHTML = notes;
  710. if( notesLayout === 'separate-page' ) {
  711. page.parentNode.insertBefore( notesElement, page.nextSibling );
  712. }
  713. else {
  714. notesElement.style.left = notesSpacing + 'px';
  715. notesElement.style.bottom = notesSpacing + 'px';
  716. notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
  717. page.appendChild( notesElement );
  718. }
  719. }
  720. }
  721. // Inject slide numbers if `slideNumbers` are enabled
  722. if( config.slideNumber && /all|print/i.test( config.showSlideNumber ) ) {
  723. var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1,
  724. slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1;
  725. var numberElement = document.createElement( 'div' );
  726. numberElement.classList.add( 'slide-number' );
  727. numberElement.classList.add( 'slide-number-pdf' );
  728. numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV );
  729. page.appendChild( numberElement );
  730. }
  731. // Copy page and show fragments one after another
  732. if( config.pdfSeparateFragments ) {
  733. // Each fragment 'group' is an array containing one or more
  734. // fragments. Multiple fragments that appear at the same time
  735. // are part of the same group.
  736. var fragmentGroups = sortFragments( page.querySelectorAll( '.fragment' ), true );
  737. var previousFragmentStep;
  738. var previousPage;
  739. fragmentGroups.forEach( function( fragments ) {
  740. // Remove 'current-fragment' from the previous group
  741. if( previousFragmentStep ) {
  742. previousFragmentStep.forEach( function( fragment ) {
  743. fragment.classList.remove( 'current-fragment' );
  744. } );
  745. }
  746. // Show the fragments for the current index
  747. fragments.forEach( function( fragment ) {
  748. fragment.classList.add( 'visible', 'current-fragment' );
  749. } );
  750. // Create a separate page for the current fragment state
  751. var clonedPage = page.cloneNode( true );
  752. page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
  753. previousFragmentStep = fragments;
  754. previousPage = clonedPage;
  755. } );
  756. // Reset the first/original page so that all fragments are hidden
  757. fragmentGroups.forEach( function( fragments ) {
  758. fragments.forEach( function( fragment ) {
  759. fragment.classList.remove( 'visible', 'current-fragment' );
  760. } );
  761. } );
  762. }
  763. // Show all fragments
  764. else {
  765. toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) {
  766. fragment.classList.add( 'visible' );
  767. } );
  768. }
  769. }
  770. } );
  771. // Notify subscribers that the PDF layout is good to go
  772. dispatchEvent( 'pdf-ready' );
  773. }
  774. /**
  775. * This is an unfortunate necessity. Some actions – such as
  776. * an input field being focused in an iframe or using the
  777. * keyboard to expand text selection beyond the bounds of
  778. * a slide – can trigger our content to be pushed out of view.
  779. * This scrolling can not be prevented by hiding overflow in
  780. * CSS (we already do) so we have to resort to repeatedly
  781. * checking if the slides have been offset :(
  782. */
  783. function setupScrollPrevention() {
  784. setInterval( function() {
  785. if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
  786. dom.wrapper.scrollTop = 0;
  787. dom.wrapper.scrollLeft = 0;
  788. }
  789. }, 1000 );
  790. }
  791. /**
  792. * Creates an HTML element and returns a reference to it.
  793. * If the element already exists the existing instance will
  794. * be returned.
  795. *
  796. * @param {HTMLElement} container
  797. * @param {string} tagname
  798. * @param {string} classname
  799. * @param {string} innerHTML
  800. *
  801. * @return {HTMLElement}
  802. */
  803. function createSingletonNode( container, tagname, classname, innerHTML ) {
  804. // Find all nodes matching the description
  805. var nodes = container.querySelectorAll( '.' + classname );
  806. // Check all matches to find one which is a direct child of
  807. // the specified container
  808. for( var i = 0; i < nodes.length; i++ ) {
  809. var testNode = nodes[i];
  810. if( testNode.parentNode === container ) {
  811. return testNode;
  812. }
  813. }
  814. // If no node was found, create it now
  815. var node = document.createElement( tagname );
  816. node.className = classname;
  817. if( typeof innerHTML === 'string' ) {
  818. node.innerHTML = innerHTML;
  819. }
  820. container.appendChild( node );
  821. return node;
  822. }
  823. /**
  824. * Creates the slide background elements and appends them
  825. * to the background container. One element is created per
  826. * slide no matter if the given slide has visible background.
  827. */
  828. function createBackgrounds() {
  829. var printMode = isPrintingPDF();
  830. // Clear prior backgrounds
  831. dom.background.innerHTML = '';
  832. dom.background.classList.add( 'no-transition' );
  833. // Iterate over all horizontal slides
  834. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  835. var backgroundStack = createBackground( slideh, dom.background );
  836. // Iterate over all vertical slides
  837. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  838. createBackground( slidev, backgroundStack );
  839. backgroundStack.classList.add( 'stack' );
  840. } );
  841. } );
  842. // Add parallax background if specified
  843. if( config.parallaxBackgroundImage ) {
  844. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  845. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  846. dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat;
  847. dom.background.style.backgroundPosition = config.parallaxBackgroundPosition;
  848. // Make sure the below properties are set on the element - these properties are
  849. // needed for proper transitions to be set on the element via CSS. To remove
  850. // annoying background slide-in effect when the presentation starts, apply
  851. // these properties after short time delay
  852. setTimeout( function() {
  853. dom.wrapper.classList.add( 'has-parallax-background' );
  854. }, 1 );
  855. }
  856. else {
  857. dom.background.style.backgroundImage = '';
  858. dom.wrapper.classList.remove( 'has-parallax-background' );
  859. }
  860. }
  861. /**
  862. * Creates a background for the given slide.
  863. *
  864. * @param {HTMLElement} slide
  865. * @param {HTMLElement} container The element that the background
  866. * should be appended to
  867. * @return {HTMLElement} New background div
  868. */
  869. function createBackground( slide, container ) {
  870. // Main slide background element
  871. var element = document.createElement( 'div' );
  872. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  873. // Inner background element that wraps images/videos/iframes
  874. var contentElement = document.createElement( 'div' );
  875. contentElement.className = 'slide-background-content';
  876. element.appendChild( contentElement );
  877. container.appendChild( element );
  878. slide.slideBackgroundElement = element;
  879. slide.slideBackgroundContentElement = contentElement;
  880. // Syncs the background to reflect all current background settings
  881. syncBackground( slide );
  882. return element;
  883. }
  884. /**
  885. * Renders all of the visual properties of a slide background
  886. * based on the various background attributes.
  887. *
  888. * @param {HTMLElement} slide
  889. */
  890. function syncBackground( slide ) {
  891. var element = slide.slideBackgroundElement,
  892. contentElement = slide.slideBackgroundContentElement;
  893. // Reset the prior background state in case this is not the
  894. // initial sync
  895. slide.classList.remove( 'has-dark-background' );
  896. slide.classList.remove( 'has-light-background' );
  897. element.removeAttribute( 'data-loaded' );
  898. element.removeAttribute( 'data-background-hash' );
  899. element.removeAttribute( 'data-background-size' );
  900. element.removeAttribute( 'data-background-transition' );
  901. element.style.backgroundColor = '';
  902. contentElement.style.backgroundSize = '';
  903. contentElement.style.backgroundRepeat = '';
  904. contentElement.style.backgroundPosition = '';
  905. contentElement.style.backgroundImage = '';
  906. contentElement.style.opacity = '';
  907. contentElement.innerHTML = '';
  908. var data = {
  909. background: slide.getAttribute( 'data-background' ),
  910. backgroundSize: slide.getAttribute( 'data-background-size' ),
  911. backgroundImage: slide.getAttribute( 'data-background-image' ),
  912. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  913. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  914. backgroundColor: slide.getAttribute( 'data-background-color' ),
  915. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  916. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  917. backgroundTransition: slide.getAttribute( 'data-background-transition' ),
  918. backgroundOpacity: slide.getAttribute( 'data-background-opacity' )
  919. };
  920. if( data.background ) {
  921. // Auto-wrap image urls in url(...)
  922. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) {
  923. slide.setAttribute( 'data-background-image', data.background );
  924. }
  925. else {
  926. element.style.background = data.background;
  927. }
  928. }
  929. // Create a hash for this combination of background settings.
  930. // This is used to determine when two slide backgrounds are
  931. // the same.
  932. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  933. element.setAttribute( 'data-background-hash', data.background +
  934. data.backgroundSize +
  935. data.backgroundImage +
  936. data.backgroundVideo +
  937. data.backgroundIframe +
  938. data.backgroundColor +
  939. data.backgroundRepeat +
  940. data.backgroundPosition +
  941. data.backgroundTransition +
  942. data.backgroundOpacity );
  943. }
  944. // Additional and optional background properties
  945. if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );
  946. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  947. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  948. // Background image options are set on the content wrapper
  949. if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
  950. if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;
  951. if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;
  952. if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;
  953. // If this slide has a background color, we add a class that
  954. // signals if it is light or dark. If the slide has no background
  955. // color, no class will be added
  956. var contrastColor = data.backgroundColor;
  957. // If no bg color was found, check the computed background
  958. if( !contrastColor ) {
  959. var computedBackgroundStyle = window.getComputedStyle( element );
  960. if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
  961. contrastColor = computedBackgroundStyle.backgroundColor;
  962. }
  963. }
  964. if( contrastColor ) {
  965. var rgb = colorToRgb( contrastColor );
  966. // Ignore fully transparent backgrounds. Some browsers return
  967. // rgba(0,0,0,0) when reading the computed background color of
  968. // an element with no background
  969. if( rgb && rgb.a !== 0 ) {
  970. if( colorBrightness( contrastColor ) < 128 ) {
  971. slide.classList.add( 'has-dark-background' );
  972. }
  973. else {
  974. slide.classList.add( 'has-light-background' );
  975. }
  976. }
  977. }
  978. }
  979. /**
  980. * Registers a listener to postMessage events, this makes it
  981. * possible to call all reveal.js API methods from another
  982. * window. For example:
  983. *
  984. * revealWindow.postMessage( JSON.stringify({
  985. * method: 'slide',
  986. * args: [ 2 ]
  987. * }), '*' );
  988. */
  989. function setupPostMessage() {
  990. if( config.postMessage ) {
  991. window.addEventListener( 'message', function ( event ) {
  992. var data = event.data;
  993. // Make sure we're dealing with JSON
  994. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  995. data = JSON.parse( data );
  996. // Check if the requested method can be found
  997. if( data.method && typeof Reveal[data.method] === 'function' ) {
  998. Reveal[data.method].apply( Reveal, data.args );
  999. }
  1000. }
  1001. }, false );
  1002. }
  1003. }
  1004. /**
  1005. * Applies the configuration settings from the config
  1006. * object. May be called multiple times.
  1007. *
  1008. * @param {object} options
  1009. */
  1010. function configure( options ) {
  1011. var oldTransition = config.transition;
  1012. // New config options may be passed when this method
  1013. // is invoked through the API after initialization
  1014. if( typeof options === 'object' ) extend( config, options );
  1015. // Abort if reveal.js hasn't finished loading, config
  1016. // changes will be applied automatically once loading
  1017. // finishes
  1018. if( loaded === false ) return;
  1019. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  1020. // Remove the previously configured transition class
  1021. dom.wrapper.classList.remove( oldTransition );
  1022. // Force linear transition based on browser capabilities
  1023. if( features.transforms3d === false ) config.transition = 'linear';
  1024. dom.wrapper.classList.add( config.transition );
  1025. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  1026. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  1027. dom.controls.style.display = config.controls ? 'block' : 'none';
  1028. dom.progress.style.display = config.progress ? 'block' : 'none';
  1029. dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout );
  1030. dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
  1031. if( config.shuffle ) {
  1032. shuffle();
  1033. }
  1034. if( config.rtl ) {
  1035. dom.wrapper.classList.add( 'rtl' );
  1036. }
  1037. else {
  1038. dom.wrapper.classList.remove( 'rtl' );
  1039. }
  1040. if( config.center ) {
  1041. dom.wrapper.classList.add( 'center' );
  1042. }
  1043. else {
  1044. dom.wrapper.classList.remove( 'center' );
  1045. }
  1046. // Exit the paused mode if it was configured off
  1047. if( config.pause === false ) {
  1048. resume();
  1049. }
  1050. if( config.showNotes ) {
  1051. dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
  1052. }
  1053. if( config.mouseWheel ) {
  1054. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1055. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1056. }
  1057. else {
  1058. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1059. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1060. }
  1061. // Rolling 3D links
  1062. if( config.rollingLinks ) {
  1063. enableRollingLinks();
  1064. }
  1065. else {
  1066. disableRollingLinks();
  1067. }
  1068. // Auto-hide the mouse pointer when its inactive
  1069. if( config.hideInactiveCursor ) {
  1070. document.addEventListener( 'mousemove', onDocumentCursorActive, false );
  1071. document.addEventListener( 'mousedown', onDocumentCursorActive, false );
  1072. }
  1073. else {
  1074. showCursor();
  1075. document.removeEventListener( 'mousemove', onDocumentCursorActive, false );
  1076. document.removeEventListener( 'mousedown', onDocumentCursorActive, false );
  1077. }
  1078. // Iframe link previews
  1079. if( config.previewLinks ) {
  1080. enablePreviewLinks();
  1081. disablePreviewLinks( '[data-preview-link=false]' );
  1082. }
  1083. else {
  1084. disablePreviewLinks();
  1085. enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
  1086. }
  1087. // Remove existing auto-slide controls
  1088. if( autoSlidePlayer ) {
  1089. autoSlidePlayer.destroy();
  1090. autoSlidePlayer = null;
  1091. }
  1092. // Generate auto-slide controls if needed
  1093. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  1094. autoSlidePlayer = new Playback( dom.wrapper, function() {
  1095. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  1096. } );
  1097. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  1098. autoSlidePaused = false;
  1099. }
  1100. // When fragments are turned off they should be visible
  1101. if( config.fragments === false ) {
  1102. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  1103. element.classList.add( 'visible' );
  1104. element.classList.remove( 'current-fragment' );
  1105. } );
  1106. }
  1107. // Slide numbers
  1108. var slideNumberDisplay = 'none';
  1109. if( config.slideNumber && !isPrintingPDF() ) {
  1110. if( config.showSlideNumber === 'all' ) {
  1111. slideNumberDisplay = 'block';
  1112. }
  1113. else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) {
  1114. slideNumberDisplay = 'block';
  1115. }
  1116. }
  1117. dom.slideNumber.style.display = slideNumberDisplay;
  1118. // Add the navigation mode to the DOM so we can adjust styling
  1119. if( config.navigationMode !== 'default' ) {
  1120. dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );
  1121. }
  1122. else {
  1123. dom.wrapper.removeAttribute( 'data-navigation-mode' );
  1124. }
  1125. sync();
  1126. }
  1127. /**
  1128. * Binds all event listeners.
  1129. */
  1130. function addEventListeners() {
  1131. eventsAreBound = true;
  1132. window.addEventListener( 'hashchange', onWindowHashChange, false );
  1133. window.addEventListener( 'resize', onWindowResize, false );
  1134. if( config.touch ) {
  1135. if( 'onpointerdown' in window ) {
  1136. // Use W3C pointer events
  1137. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  1138. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  1139. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  1140. }
  1141. else if( window.navigator.msPointerEnabled ) {
  1142. // IE 10 uses prefixed version of pointer events
  1143. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  1144. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  1145. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  1146. }
  1147. else {
  1148. // Fall back to touch events
  1149. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  1150. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  1151. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  1152. }
  1153. }
  1154. if( config.keyboard ) {
  1155. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  1156. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  1157. }
  1158. if( config.progress && dom.progress ) {
  1159. dom.progress.addEventListener( 'click', onProgressClicked, false );
  1160. }
  1161. dom.pauseOverlay.addEventListener( 'click', resume, false );
  1162. if( config.focusBodyOnPageVisibilityChange ) {
  1163. var visibilityChange;
  1164. if( 'hidden' in document ) {
  1165. visibilityChange = 'visibilitychange';
  1166. }
  1167. else if( 'msHidden' in document ) {
  1168. visibilityChange = 'msvisibilitychange';
  1169. }
  1170. else if( 'webkitHidden' in document ) {
  1171. visibilityChange = 'webkitvisibilitychange';
  1172. }
  1173. if( visibilityChange ) {
  1174. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  1175. }
  1176. }
  1177. // Listen to both touch and click events, in case the device
  1178. // supports both
  1179. var pointerEvents = [ 'touchstart', 'click' ];
  1180. // Only support touch for Android, fixes double navigations in
  1181. // stock browser
  1182. if( UA.match( /android/gi ) ) {
  1183. pointerEvents = [ 'touchstart' ];
  1184. }
  1185. pointerEvents.forEach( function( eventName ) {
  1186. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  1187. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  1188. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  1189. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  1190. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  1191. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  1192. } );
  1193. }
  1194. /**
  1195. * Unbinds all event listeners.
  1196. */
  1197. function removeEventListeners() {
  1198. eventsAreBound = false;
  1199. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  1200. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  1201. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  1202. window.removeEventListener( 'resize', onWindowResize, false );
  1203. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  1204. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  1205. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  1206. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  1207. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  1208. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  1209. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  1210. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  1211. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  1212. dom.pauseOverlay.removeEventListener( 'click', resume, false );
  1213. if ( config.progress && dom.progress ) {
  1214. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  1215. }
  1216. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  1217. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  1218. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  1219. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  1220. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  1221. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  1222. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  1223. } );
  1224. }
  1225. /**
  1226. * Registers a new plugin with this reveal.js instance.
  1227. *
  1228. * reveal.js waits for all regisered plugins to initialize
  1229. * before considering itself ready, as long as the plugin
  1230. * is registered before calling `Reveal.initialize()`.
  1231. */
  1232. function registerPlugin( id, plugin ) {
  1233. if( plugins[id] === undefined ) {
  1234. plugins[id] = plugin;
  1235. // If a plugin is registered after reveal.js is loaded,
  1236. // initialize it right away
  1237. if( loaded && typeof plugin.init === 'function' ) {
  1238. plugin.init();
  1239. }
  1240. }
  1241. else {
  1242. console.warn( 'reveal.js: "'+ id +'" plugin has already been registered' );
  1243. }
  1244. }
  1245. /**
  1246. * Checks if a specific plugin has been registered.
  1247. *
  1248. * @param {String} id Unique plugin identifier
  1249. */
  1250. function hasPlugin( id ) {
  1251. return !!plugins[id];
  1252. }
  1253. /**
  1254. * Returns the specific plugin instance, if a plugin
  1255. * with the given ID has been registered.
  1256. *
  1257. * @param {String} id Unique plugin identifier
  1258. */
  1259. function getPlugin( id ) {
  1260. return plugins[id];
  1261. }
  1262. /**
  1263. * Add a custom key binding with optional description to
  1264. * be added to the help screen.
  1265. */
  1266. function addKeyBinding( binding, callback ) {
  1267. if( typeof binding === 'object' && binding.keyCode ) {
  1268. registeredKeyBindings[binding.keyCode] = {
  1269. callback: callback,
  1270. key: binding.key,
  1271. description: binding.description
  1272. };
  1273. }
  1274. else {
  1275. registeredKeyBindings[binding] = {
  1276. callback: callback,
  1277. key: null,
  1278. description: null
  1279. };
  1280. }
  1281. }
  1282. /**
  1283. * Removes the specified custom key binding.
  1284. */
  1285. function removeKeyBinding( keyCode ) {
  1286. delete registeredKeyBindings[keyCode];
  1287. }
  1288. /**
  1289. * Extend object a with the properties of object b.
  1290. * If there's a conflict, object b takes precedence.
  1291. *
  1292. * @param {object} a
  1293. * @param {object} b
  1294. */
  1295. function extend( a, b ) {
  1296. for( var i in b ) {
  1297. a[ i ] = b[ i ];
  1298. }
  1299. return a;
  1300. }
  1301. /**
  1302. * Converts the target object to an array.
  1303. *
  1304. * @param {object} o
  1305. * @return {object[]}
  1306. */
  1307. function toArray( o ) {
  1308. return Array.prototype.slice.call( o );
  1309. }
  1310. /**
  1311. * Utility for deserializing a value.
  1312. *
  1313. * @param {*} value
  1314. * @return {*}
  1315. */
  1316. function deserialize( value ) {
  1317. if( typeof value === 'string' ) {
  1318. if( value === 'null' ) return null;
  1319. else if( value === 'true' ) return true;
  1320. else if( value === 'false' ) return false;
  1321. else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
  1322. }
  1323. return value;
  1324. }
  1325. /**
  1326. * Measures the distance in pixels between point a
  1327. * and point b.
  1328. *
  1329. * @param {object} a point with x/y properties
  1330. * @param {object} b point with x/y properties
  1331. *
  1332. * @return {number}
  1333. */
  1334. function distanceBetween( a, b ) {
  1335. var dx = a.x - b.x,
  1336. dy = a.y - b.y;
  1337. return Math.sqrt( dx*dx + dy*dy );
  1338. }
  1339. /**
  1340. * Applies a CSS transform to the target element.
  1341. *
  1342. * @param {HTMLElement} element
  1343. * @param {string} transform
  1344. */
  1345. function transformElement( element, transform ) {
  1346. element.style.WebkitTransform = transform;
  1347. element.style.MozTransform = transform;
  1348. element.style.msTransform = transform;
  1349. element.style.transform = transform;
  1350. }
  1351. /**
  1352. * Applies CSS transforms to the slides container. The container
  1353. * is transformed from two separate sources: layout and the overview
  1354. * mode.
  1355. *
  1356. * @param {object} transforms
  1357. */
  1358. function transformSlides( transforms ) {
  1359. // Pick up new transforms from arguments
  1360. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  1361. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  1362. // Apply the transforms to the slides container
  1363. if( slidesTransform.layout ) {
  1364. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  1365. }
  1366. else {
  1367. transformElement( dom.slides, slidesTransform.overview );
  1368. }
  1369. }
  1370. /**
  1371. * Injects the given CSS styles into the DOM.
  1372. *
  1373. * @param {string} value
  1374. */
  1375. function injectStyleSheet( value ) {
  1376. var tag = document.createElement( 'style' );
  1377. tag.type = 'text/css';
  1378. if( tag.styleSheet ) {
  1379. tag.styleSheet.cssText = value;
  1380. }
  1381. else {
  1382. tag.appendChild( document.createTextNode( value ) );
  1383. }
  1384. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  1385. }
  1386. /**
  1387. * Find the closest parent that matches the given
  1388. * selector.
  1389. *
  1390. * @param {HTMLElement} target The child element
  1391. * @param {String} selector The CSS selector to match
  1392. * the parents against
  1393. *
  1394. * @return {HTMLElement} The matched parent or null
  1395. * if no matching parent was found
  1396. */
  1397. function closestParent( target, selector ) {
  1398. var parent = target.parentNode;
  1399. while( parent ) {
  1400. // There's some overhead doing this each time, we don't
  1401. // want to rewrite the element prototype but should still
  1402. // be enough to feature detect once at startup...
  1403. var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
  1404. // If we find a match, we're all set
  1405. if( matchesMethod && matchesMethod.call( parent, selector ) ) {
  1406. return parent;
  1407. }
  1408. // Keep searching
  1409. parent = parent.parentNode;
  1410. }
  1411. return null;
  1412. }
  1413. /**
  1414. * Converts various color input formats to an {r:0,g:0,b:0} object.
  1415. *
  1416. * @param {string} color The string representation of a color
  1417. * @example
  1418. * colorToRgb('#000');
  1419. * @example
  1420. * colorToRgb('#000000');
  1421. * @example
  1422. * colorToRgb('rgb(0,0,0)');
  1423. * @example
  1424. * colorToRgb('rgba(0,0,0)');
  1425. *
  1426. * @return {{r: number, g: number, b: number, [a]: number}|null}
  1427. */
  1428. function colorToRgb( color ) {
  1429. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  1430. if( hex3 && hex3[1] ) {
  1431. hex3 = hex3[1];
  1432. return {
  1433. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  1434. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  1435. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  1436. };
  1437. }
  1438. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  1439. if( hex6 && hex6[1] ) {
  1440. hex6 = hex6[1];
  1441. return {
  1442. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  1443. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  1444. b: parseInt( hex6.substr( 4, 2 ), 16 )
  1445. };
  1446. }
  1447. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  1448. if( rgb ) {
  1449. return {
  1450. r: parseInt( rgb[1], 10 ),
  1451. g: parseInt( rgb[2], 10 ),
  1452. b: parseInt( rgb[3], 10 )
  1453. };
  1454. }
  1455. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  1456. if( rgba ) {
  1457. return {
  1458. r: parseInt( rgba[1], 10 ),
  1459. g: parseInt( rgba[2], 10 ),
  1460. b: parseInt( rgba[3], 10 ),
  1461. a: parseFloat( rgba[4] )
  1462. };
  1463. }
  1464. return null;
  1465. }
  1466. /**
  1467. * Calculates brightness on a scale of 0-255.
  1468. *
  1469. * @param {string} color See colorToRgb for supported formats.
  1470. * @see {@link colorToRgb}
  1471. */
  1472. function colorBrightness( color ) {
  1473. if( typeof color === 'string' ) color = colorToRgb( color );
  1474. if( color ) {
  1475. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  1476. }
  1477. return null;
  1478. }
  1479. /**
  1480. * Returns the remaining height within the parent of the
  1481. * target element.
  1482. *
  1483. * remaining height = [ configured parent height ] - [ current parent height ]
  1484. *
  1485. * @param {HTMLElement} element
  1486. * @param {number} [height]
  1487. */
  1488. function getRemainingHeight( element, height ) {
  1489. height = height || 0;
  1490. if( element ) {
  1491. var newHeight, oldHeight = element.style.height;
  1492. // Change the .stretch element height to 0 in order find the height of all
  1493. // the other elements
  1494. element.style.height = '0px';
  1495. // In Overview mode, the parent (.slide) height is set of 700px.
  1496. // Restore it temporarily to its natural height.
  1497. element.parentNode.style.height = 'auto';
  1498. newHeight = height - element.parentNode.offsetHeight;
  1499. // Restore the old height, just in case
  1500. element.style.height = oldHeight + 'px';
  1501. // Clear the parent (.slide) height. .removeProperty works in IE9+
  1502. element.parentNode.style.removeProperty('height');
  1503. return newHeight;
  1504. }
  1505. return height;
  1506. }
  1507. /**
  1508. * Checks if this instance is being used to print a PDF.
  1509. */
  1510. function isPrintingPDF() {
  1511. return ( /print-pdf/gi ).test( window.location.search );
  1512. }
  1513. /**
  1514. * Hides the address bar if we're on a mobile device.
  1515. */
  1516. function hideAddressBar() {
  1517. if( config.hideAddressBar && isMobileDevice ) {
  1518. // Events that should trigger the address bar to hide
  1519. window.addEventListener( 'load', removeAddressBar, false );
  1520. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1521. }
  1522. }
  1523. /**
  1524. * Causes the address bar to hide on mobile devices,
  1525. * more vertical space ftw.
  1526. */
  1527. function removeAddressBar() {
  1528. setTimeout( function() {
  1529. window.scrollTo( 0, 1 );
  1530. }, 10 );
  1531. }
  1532. /**
  1533. * Dispatches an event of the specified type from the
  1534. * reveal DOM element.
  1535. */
  1536. function dispatchEvent( type, args ) {
  1537. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1538. event.initEvent( type, true, true );
  1539. extend( event, args );
  1540. dom.wrapper.dispatchEvent( event );
  1541. // If we're in an iframe, post each reveal.js event to the
  1542. // parent window. Used by the notes plugin
  1543. if( config.postMessageEvents && window.parent !== window.self ) {
  1544. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  1545. }
  1546. }
  1547. /**
  1548. * Wrap all links in 3D goodness.
  1549. */
  1550. function enableRollingLinks() {
  1551. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1552. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1553. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1554. var anchor = anchors[i];
  1555. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1556. var span = document.createElement('span');
  1557. span.setAttribute('data-title', anchor.text);
  1558. span.innerHTML = anchor.innerHTML;
  1559. anchor.classList.add( 'roll' );
  1560. anchor.innerHTML = '';
  1561. anchor.appendChild(span);
  1562. }
  1563. }
  1564. }
  1565. }
  1566. /**
  1567. * Unwrap all 3D links.
  1568. */
  1569. function disableRollingLinks() {
  1570. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1571. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1572. var anchor = anchors[i];
  1573. var span = anchor.querySelector( 'span' );
  1574. if( span ) {
  1575. anchor.classList.remove( 'roll' );
  1576. anchor.innerHTML = span.innerHTML;
  1577. }
  1578. }
  1579. }
  1580. /**
  1581. * Bind preview frame links.
  1582. *
  1583. * @param {string} [selector=a] - selector for anchors
  1584. */
  1585. function enablePreviewLinks( selector ) {
  1586. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1587. anchors.forEach( function( element ) {
  1588. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1589. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1590. }
  1591. } );
  1592. }
  1593. /**
  1594. * Unbind preview frame links.
  1595. */
  1596. function disablePreviewLinks( selector ) {
  1597. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1598. anchors.forEach( function( element ) {
  1599. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1600. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1601. }
  1602. } );
  1603. }
  1604. /**
  1605. * Opens a preview window for the target URL.
  1606. *
  1607. * @param {string} url - url for preview iframe src
  1608. */
  1609. function showPreview( url ) {
  1610. closeOverlay();
  1611. dom.overlay = document.createElement( 'div' );
  1612. dom.overlay.classList.add( 'overlay' );
  1613. dom.overlay.classList.add( 'overlay-preview' );
  1614. dom.wrapper.appendChild( dom.overlay );
  1615. dom.overlay.innerHTML = [
  1616. '<header>',
  1617. '<a class="close" href="#"><span class="icon"></span></a>',
  1618. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1619. '</header>',
  1620. '<div class="spinner"></div>',
  1621. '<div class="viewport">',
  1622. '<iframe src="'+ url +'"></iframe>',
  1623. '<small class="viewport-inner">',
  1624. '<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>',
  1625. '</small>',
  1626. '</div>'
  1627. ].join('');
  1628. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1629. dom.overlay.classList.add( 'loaded' );
  1630. }, false );
  1631. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1632. closeOverlay();
  1633. event.preventDefault();
  1634. }, false );
  1635. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1636. closeOverlay();
  1637. }, false );
  1638. setTimeout( function() {
  1639. dom.overlay.classList.add( 'visible' );
  1640. }, 1 );
  1641. }
  1642. /**
  1643. * Open or close help overlay window.
  1644. *
  1645. * @param {Boolean} [override] Flag which overrides the
  1646. * toggle logic and forcibly sets the desired state. True means
  1647. * help is open, false means it's closed.
  1648. */
  1649. function toggleHelp( override ){
  1650. if( typeof override === 'boolean' ) {
  1651. override ? showHelp() : closeOverlay();
  1652. }
  1653. else {
  1654. if( dom.overlay ) {
  1655. closeOverlay();
  1656. }
  1657. else {
  1658. showHelp();
  1659. }
  1660. }
  1661. }
  1662. /**
  1663. * Opens an overlay window with help material.
  1664. */
  1665. function showHelp() {
  1666. if( config.help ) {
  1667. closeOverlay();
  1668. dom.overlay = document.createElement( 'div' );
  1669. dom.overlay.classList.add( 'overlay' );
  1670. dom.overlay.classList.add( 'overlay-help' );
  1671. dom.wrapper.appendChild( dom.overlay );
  1672. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1673. html += '<table><th>KEY</th><th>ACTION</th>';
  1674. for( var key in keyboardShortcuts ) {
  1675. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1676. }
  1677. // Add custom key bindings that have associated descriptions
  1678. for( var binding in registeredKeyBindings ) {
  1679. if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) {
  1680. html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</td></tr>';
  1681. }
  1682. }
  1683. html += '</table>';
  1684. dom.overlay.innerHTML = [
  1685. '<header>',
  1686. '<a class="close" href="#"><span class="icon"></span></a>',
  1687. '</header>',
  1688. '<div class="viewport">',
  1689. '<div class="viewport-inner">'+ html +'</div>',
  1690. '</div>'
  1691. ].join('');
  1692. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1693. closeOverlay();
  1694. event.preventDefault();
  1695. }, false );
  1696. setTimeout( function() {
  1697. dom.overlay.classList.add( 'visible' );
  1698. }, 1 );
  1699. }
  1700. }
  1701. /**
  1702. * Closes any currently open overlay.
  1703. */
  1704. function closeOverlay() {
  1705. if( dom.overlay ) {
  1706. dom.overlay.parentNode.removeChild( dom.overlay );
  1707. dom.overlay = null;
  1708. }
  1709. }
  1710. /**
  1711. * Applies JavaScript-controlled layout rules to the
  1712. * presentation.
  1713. */
  1714. function layout() {
  1715. if( dom.wrapper && !isPrintingPDF() ) {
  1716. if( !config.disableLayout ) {
  1717. // On some mobile devices '100vh' is taller than the visible
  1718. // viewport which leads to part of the presentation being
  1719. // cut off. To work around this we define our own '--vh' custom
  1720. // property where 100x adds up to the correct height.
  1721. //
  1722. // https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
  1723. if( isMobileDevice ) {
  1724. document.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );
  1725. }
  1726. var size = getComputedSlideSize();
  1727. var oldScale = scale;
  1728. // Layout the contents of the slides
  1729. layoutSlideContents( config.width, config.height );
  1730. dom.slides.style.width = size.width + 'px';
  1731. dom.slides.style.height = size.height + 'px';
  1732. // Determine scale of content to fit within available space
  1733. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1734. // Respect max/min scale settings
  1735. scale = Math.max( scale, config.minScale );
  1736. scale = Math.min( scale, config.maxScale );
  1737. // Don't apply any scaling styles if scale is 1
  1738. if( scale === 1 ) {
  1739. dom.slides.style.zoom = '';
  1740. dom.slides.style.left = '';
  1741. dom.slides.style.top = '';
  1742. dom.slides.style.bottom = '';
  1743. dom.slides.style.right = '';
  1744. transformSlides( { layout: '' } );
  1745. }
  1746. else {
  1747. // Prefer zoom for scaling up so that content remains crisp.
  1748. // Don't use zoom to scale down since that can lead to shifts
  1749. // in text layout/line breaks.
  1750. if( scale > 1 && features.zoom ) {
  1751. dom.slides.style.zoom = scale;
  1752. dom.slides.style.left = '';
  1753. dom.slides.style.top = '';
  1754. dom.slides.style.bottom = '';
  1755. dom.slides.style.right = '';
  1756. transformSlides( { layout: '' } );
  1757. }
  1758. // Apply scale transform as a fallback
  1759. else {
  1760. dom.slides.style.zoom = '';
  1761. dom.slides.style.left = '50%';
  1762. dom.slides.style.top = '50%';
  1763. dom.slides.style.bottom = 'auto';
  1764. dom.slides.style.right = 'auto';
  1765. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1766. }
  1767. }
  1768. // Select all slides, vertical and horizontal
  1769. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1770. for( var i = 0, len = slides.length; i < len; i++ ) {
  1771. var slide = slides[ i ];
  1772. // Don't bother updating invisible slides
  1773. if( slide.style.display === 'none' ) {
  1774. continue;
  1775. }
  1776. if( config.center || slide.classList.contains( 'center' ) ) {
  1777. // Vertical stacks are not centred since their section
  1778. // children will be
  1779. if( slide.classList.contains( 'stack' ) ) {
  1780. slide.style.top = 0;
  1781. }
  1782. else {
  1783. slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
  1784. }
  1785. }
  1786. else {
  1787. slide.style.top = '';
  1788. }
  1789. }
  1790. if( oldScale !== scale ) {
  1791. dispatchEvent( 'resize', {
  1792. 'oldScale': oldScale,
  1793. 'scale': scale,
  1794. 'size': size
  1795. } );
  1796. }
  1797. }
  1798. updateProgress();
  1799. updateParallax();
  1800. if( isOverview() ) {
  1801. updateOverview();
  1802. }
  1803. }
  1804. }
  1805. /**
  1806. * Applies layout logic to the contents of all slides in
  1807. * the presentation.
  1808. *
  1809. * @param {string|number} width
  1810. * @param {string|number} height
  1811. */
  1812. function layoutSlideContents( width, height ) {
  1813. // Handle sizing of elements with the 'stretch' class
  1814. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1815. // Determine how much vertical space we can use
  1816. var remainingHeight = getRemainingHeight( element, height );
  1817. // Consider the aspect ratio of media elements
  1818. if( /(img|video)/gi.test( element.nodeName ) ) {
  1819. var nw = element.naturalWidth || element.videoWidth,
  1820. nh = element.naturalHeight || element.videoHeight;
  1821. var es = Math.min( width / nw, remainingHeight / nh );
  1822. element.style.width = ( nw * es ) + 'px';
  1823. element.style.height = ( nh * es ) + 'px';
  1824. }
  1825. else {
  1826. element.style.width = width + 'px';
  1827. element.style.height = remainingHeight + 'px';
  1828. }
  1829. } );
  1830. }
  1831. /**
  1832. * Calculates the computed pixel size of our slides. These
  1833. * values are based on the width and height configuration
  1834. * options.
  1835. *
  1836. * @param {number} [presentationWidth=dom.wrapper.offsetWidth]
  1837. * @param {number} [presentationHeight=dom.wrapper.offsetHeight]
  1838. */
  1839. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1840. var size = {
  1841. // Slide size
  1842. width: config.width,
  1843. height: config.height,
  1844. // Presentation size
  1845. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1846. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1847. };
  1848. // Reduce available space by margin
  1849. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1850. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1851. // Slide width may be a percentage of available width
  1852. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1853. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1854. }
  1855. // Slide height may be a percentage of available height
  1856. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1857. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1858. }
  1859. return size;
  1860. }
  1861. /**
  1862. * Stores the vertical index of a stack so that the same
  1863. * vertical slide can be selected when navigating to and
  1864. * from the stack.
  1865. *
  1866. * @param {HTMLElement} stack The vertical stack element
  1867. * @param {string|number} [v=0] Index to memorize
  1868. */
  1869. function setPreviousVerticalIndex( stack, v ) {
  1870. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1871. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1872. }
  1873. }
  1874. /**
  1875. * Retrieves the vertical index which was stored using
  1876. * #setPreviousVerticalIndex() or 0 if no previous index
  1877. * exists.
  1878. *
  1879. * @param {HTMLElement} stack The vertical stack element
  1880. */
  1881. function getPreviousVerticalIndex( stack ) {
  1882. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1883. // Prefer manually defined start-indexv
  1884. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1885. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1886. }
  1887. return 0;
  1888. }
  1889. /**
  1890. * Displays the overview of slides (quick nav) by scaling
  1891. * down and arranging all slide elements.
  1892. */
  1893. function activateOverview() {
  1894. // Only proceed if enabled in config
  1895. if( config.overview && !isOverview() ) {
  1896. overview = true;
  1897. dom.wrapper.classList.add( 'overview' );
  1898. dom.wrapper.classList.remove( 'overview-deactivating' );
  1899. if( features.overviewTransitions ) {
  1900. setTimeout( function() {
  1901. dom.wrapper.classList.add( 'overview-animated' );
  1902. }, 1 );
  1903. }
  1904. // Don't auto-slide while in overview mode
  1905. cancelAutoSlide();
  1906. // Move the backgrounds element into the slide container to
  1907. // that the same scaling is applied
  1908. dom.slides.appendChild( dom.background );
  1909. // Clicking on an overview slide navigates to it
  1910. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1911. if( !slide.classList.contains( 'stack' ) ) {
  1912. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1913. }
  1914. } );
  1915. // Calculate slide sizes
  1916. var margin = 70;
  1917. var slideSize = getComputedSlideSize();
  1918. overviewSlideWidth = slideSize.width + margin;
  1919. overviewSlideHeight = slideSize.height + margin;
  1920. // Reverse in RTL mode
  1921. if( config.rtl ) {
  1922. overviewSlideWidth = -overviewSlideWidth;
  1923. }
  1924. updateSlidesVisibility();
  1925. layoutOverview();
  1926. updateOverview();
  1927. layout();
  1928. // Notify observers of the overview showing
  1929. dispatchEvent( 'overviewshown', {
  1930. 'indexh': indexh,
  1931. 'indexv': indexv,
  1932. 'currentSlide': currentSlide
  1933. } );
  1934. }
  1935. }
  1936. /**
  1937. * Uses CSS transforms to position all slides in a grid for
  1938. * display inside of the overview mode.
  1939. */
  1940. function layoutOverview() {
  1941. // Layout slides
  1942. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1943. hslide.setAttribute( 'data-index-h', h );
  1944. transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1945. if( hslide.classList.contains( 'stack' ) ) {
  1946. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1947. vslide.setAttribute( 'data-index-h', h );
  1948. vslide.setAttribute( 'data-index-v', v );
  1949. transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1950. } );
  1951. }
  1952. } );
  1953. // Layout slide backgrounds
  1954. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1955. transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1956. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1957. transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1958. } );
  1959. } );
  1960. }
  1961. /**
  1962. * Moves the overview viewport to the current slides.
  1963. * Called each time the current slide changes.
  1964. */
  1965. function updateOverview() {
  1966. var vmin = Math.min( window.innerWidth, window.innerHeight );
  1967. var scale = Math.max( vmin / 5, 150 ) / vmin;
  1968. transformSlides( {
  1969. overview: [
  1970. 'scale('+ scale +')',
  1971. 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
  1972. 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)'
  1973. ].join( ' ' )
  1974. } );
  1975. }
  1976. /**
  1977. * Exits the slide overview and enters the currently
  1978. * active slide.
  1979. */
  1980. function deactivateOverview() {
  1981. // Only proceed if enabled in config
  1982. if( config.overview ) {
  1983. overview = false;
  1984. dom.wrapper.classList.remove( 'overview' );
  1985. dom.wrapper.classList.remove( 'overview-animated' );
  1986. // Temporarily add a class so that transitions can do different things
  1987. // depending on whether they are exiting/entering overview, or just
  1988. // moving from slide to slide
  1989. dom.wrapper.classList.add( 'overview-deactivating' );
  1990. setTimeout( function () {
  1991. dom.wrapper.classList.remove( 'overview-deactivating' );
  1992. }, 1 );
  1993. // Move the background element back out
  1994. dom.wrapper.appendChild( dom.background );
  1995. // Clean up changes made to slides
  1996. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1997. transformElement( slide, '' );
  1998. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1999. } );
  2000. // Clean up changes made to backgrounds
  2001. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  2002. transformElement( background, '' );
  2003. } );
  2004. transformSlides( { overview: '' } );
  2005. slide( indexh, indexv );
  2006. layout();
  2007. cueAutoSlide();
  2008. // Notify observers of the overview hiding
  2009. dispatchEvent( 'overviewhidden', {
  2010. 'indexh': indexh,
  2011. 'indexv': indexv,
  2012. 'currentSlide': currentSlide
  2013. } );
  2014. }
  2015. }
  2016. /**
  2017. * Toggles the slide overview mode on and off.
  2018. *
  2019. * @param {Boolean} [override] Flag which overrides the
  2020. * toggle logic and forcibly sets the desired state. True means
  2021. * overview is open, false means it's closed.
  2022. */
  2023. function toggleOverview( override ) {
  2024. if( typeof override === 'boolean' ) {
  2025. override ? activateOverview() : deactivateOverview();
  2026. }
  2027. else {
  2028. isOverview() ? deactivateOverview() : activateOverview();
  2029. }
  2030. }
  2031. /**
  2032. * Checks if the overview is currently active.
  2033. *
  2034. * @return {Boolean} true if the overview is active,
  2035. * false otherwise
  2036. */
  2037. function isOverview() {
  2038. return overview;
  2039. }
  2040. /**
  2041. * Return a hash URL that will resolve to the current slide location.
  2042. */
  2043. function locationHash() {
  2044. var url = '/';
  2045. // Attempt to create a named link based on the slide's ID
  2046. var id = currentSlide ? currentSlide.getAttribute( 'id' ) : null;
  2047. if( id ) {
  2048. id = encodeURIComponent( id );
  2049. }
  2050. var indexf;
  2051. if( config.fragmentInURL ) {
  2052. indexf = getIndices().f;
  2053. }
  2054. // If the current slide has an ID, use that as a named link,
  2055. // but we don't support named links with a fragment index
  2056. if( typeof id === 'string' && id.length && indexf === undefined ) {
  2057. url = '/' + id;
  2058. }
  2059. // Otherwise use the /h/v index
  2060. else {
  2061. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  2062. if( indexh > 0 || indexv > 0 || indexf !== undefined ) url += indexh + hashIndexBase;
  2063. if( indexv > 0 || indexf !== undefined ) url += '/' + (indexv + hashIndexBase );
  2064. if( indexf !== undefined ) url += '/' + indexf;
  2065. }
  2066. return url;
  2067. }
  2068. /**
  2069. * Checks if the current or specified slide is vertical
  2070. * (nested within another slide).
  2071. *
  2072. * @param {HTMLElement} [slide=currentSlide] The slide to check
  2073. * orientation of
  2074. * @return {Boolean}
  2075. */
  2076. function isVerticalSlide( slide ) {
  2077. // Prefer slide argument, otherwise use current slide
  2078. slide = slide ? slide : currentSlide;
  2079. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  2080. }
  2081. /**
  2082. * Handling the fullscreen functionality via the fullscreen API
  2083. *
  2084. * @see http://fullscreen.spec.whatwg.org/
  2085. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  2086. */
  2087. function enterFullscreen() {
  2088. var element = document.documentElement;
  2089. // Check which implementation is available
  2090. var requestMethod = element.requestFullscreen ||
  2091. element.webkitRequestFullscreen ||
  2092. element.webkitRequestFullScreen ||
  2093. element.mozRequestFullScreen ||
  2094. element.msRequestFullscreen;
  2095. if( requestMethod ) {
  2096. requestMethod.apply( element );
  2097. }
  2098. }
  2099. /**
  2100. * Shows the mouse pointer after it has been hidden with
  2101. * #hideCursor.
  2102. */
  2103. function showCursor() {
  2104. if( cursorHidden ) {
  2105. cursorHidden = false;
  2106. dom.wrapper.style.cursor = '';
  2107. }
  2108. }
  2109. /**
  2110. * Hides the mouse pointer when it's on top of the .reveal
  2111. * container.
  2112. */
  2113. function hideCursor() {
  2114. if( cursorHidden === false ) {
  2115. cursorHidden = true;
  2116. dom.wrapper.style.cursor = 'none';
  2117. }
  2118. }
  2119. /**
  2120. * Enters the paused mode which fades everything on screen to
  2121. * black.
  2122. */
  2123. function pause() {
  2124. if( config.pause ) {
  2125. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2126. cancelAutoSlide();
  2127. dom.wrapper.classList.add( 'paused' );
  2128. if( wasPaused === false ) {
  2129. dispatchEvent( 'paused' );
  2130. }
  2131. }
  2132. }
  2133. /**
  2134. * Exits from the paused mode.
  2135. */
  2136. function resume() {
  2137. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2138. dom.wrapper.classList.remove( 'paused' );
  2139. cueAutoSlide();
  2140. if( wasPaused ) {
  2141. dispatchEvent( 'resumed' );
  2142. }
  2143. }
  2144. /**
  2145. * Toggles the paused mode on and off.
  2146. */
  2147. function togglePause( override ) {
  2148. if( typeof override === 'boolean' ) {
  2149. override ? pause() : resume();
  2150. }
  2151. else {
  2152. isPaused() ? resume() : pause();
  2153. }
  2154. }
  2155. /**
  2156. * Checks if we are currently in the paused mode.
  2157. *
  2158. * @return {Boolean}
  2159. */
  2160. function isPaused() {
  2161. return dom.wrapper.classList.contains( 'paused' );
  2162. }
  2163. /**
  2164. * Toggles the auto slide mode on and off.
  2165. *
  2166. * @param {Boolean} [override] Flag which sets the desired state.
  2167. * True means autoplay starts, false means it stops.
  2168. */
  2169. function toggleAutoSlide( override ) {
  2170. if( typeof override === 'boolean' ) {
  2171. override ? resumeAutoSlide() : pauseAutoSlide();
  2172. }
  2173. else {
  2174. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  2175. }
  2176. }
  2177. /**
  2178. * Checks if the auto slide mode is currently on.
  2179. *
  2180. * @return {Boolean}
  2181. */
  2182. function isAutoSliding() {
  2183. return !!( autoSlide && !autoSlidePaused );
  2184. }
  2185. /**
  2186. * Steps from the current point in the presentation to the
  2187. * slide which matches the specified horizontal and vertical
  2188. * indices.
  2189. *
  2190. * @param {number} [h=indexh] Horizontal index of the target slide
  2191. * @param {number} [v=indexv] Vertical index of the target slide
  2192. * @param {number} [f] Index of a fragment within the
  2193. * target slide to activate
  2194. * @param {number} [o] Origin for use in multimaster environments
  2195. */
  2196. function slide( h, v, f, o ) {
  2197. // Remember where we were at before
  2198. previousSlide = currentSlide;
  2199. // Query all horizontal slides in the deck
  2200. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  2201. // Abort if there are no slides
  2202. if( horizontalSlides.length === 0 ) return;
  2203. // If no vertical index is specified and the upcoming slide is a
  2204. // stack, resume at its previous vertical index
  2205. if( v === undefined && !isOverview() ) {
  2206. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  2207. }
  2208. // If we were on a vertical stack, remember what vertical index
  2209. // it was on so we can resume at the same position when returning
  2210. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  2211. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  2212. }
  2213. // Remember the state before this slide
  2214. var stateBefore = state.concat();
  2215. // Reset the state array
  2216. state.length = 0;
  2217. var indexhBefore = indexh || 0,
  2218. indexvBefore = indexv || 0;
  2219. // Activate and transition to the new slide
  2220. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  2221. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  2222. // Update the visibility of slides now that the indices have changed
  2223. updateSlidesVisibility();
  2224. layout();
  2225. // Update the overview if it's currently active
  2226. if( isOverview() ) {
  2227. updateOverview();
  2228. }
  2229. // Find the current horizontal slide and any possible vertical slides
  2230. // within it
  2231. var currentHorizontalSlide = horizontalSlides[ indexh ],
  2232. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  2233. // Store references to the previous and current slides
  2234. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  2235. // Show fragment, if specified
  2236. if( typeof f !== 'undefined' ) {
  2237. navigateFragment( f );
  2238. }
  2239. // Dispatch an event if the slide changed
  2240. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  2241. if (!slideChanged) {
  2242. // Ensure that the previous slide is never the same as the current
  2243. previousSlide = null;
  2244. }
  2245. // Solves an edge case where the previous slide maintains the
  2246. // 'present' class when navigating between adjacent vertical
  2247. // stacks
  2248. if( previousSlide && previousSlide !== currentSlide ) {
  2249. previousSlide.classList.remove( 'present' );
  2250. previousSlide.setAttribute( 'aria-hidden', 'true' );
  2251. // Reset all slides upon navigate to home
  2252. // Issue: #285
  2253. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  2254. // Launch async task
  2255. setTimeout( function () {
  2256. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  2257. for( i in slides ) {
  2258. if( slides[i] ) {
  2259. // Reset stack
  2260. setPreviousVerticalIndex( slides[i], 0 );
  2261. }
  2262. }
  2263. }, 0 );
  2264. }
  2265. }
  2266. // Apply the new state
  2267. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  2268. // Check if this state existed on the previous slide. If it
  2269. // did, we will avoid adding it repeatedly
  2270. for( var j = 0; j < stateBefore.length; j++ ) {
  2271. if( stateBefore[j] === state[i] ) {
  2272. stateBefore.splice( j, 1 );
  2273. continue stateLoop;
  2274. }
  2275. }
  2276. document.documentElement.classList.add( state[i] );
  2277. // Dispatch custom event matching the state's name
  2278. dispatchEvent( state[i] );
  2279. }
  2280. // Clean up the remains of the previous state
  2281. while( stateBefore.length ) {
  2282. document.documentElement.classList.remove( stateBefore.pop() );
  2283. }
  2284. if( slideChanged ) {
  2285. dispatchEvent( 'slidechanged', {
  2286. 'indexh': indexh,
  2287. 'indexv': indexv,
  2288. 'previousSlide': previousSlide,
  2289. 'currentSlide': currentSlide,
  2290. 'origin': o
  2291. } );
  2292. }
  2293. // Handle embedded content
  2294. if( slideChanged || !previousSlide ) {
  2295. stopEmbeddedContent( previousSlide );
  2296. startEmbeddedContent( currentSlide );
  2297. }
  2298. // Announce the current slide contents, for screen readers
  2299. dom.statusDiv.textContent = getStatusText( currentSlide );
  2300. updateControls();
  2301. updateProgress();
  2302. updateBackground();
  2303. updateParallax();
  2304. updateSlideNumber();
  2305. updateNotes();
  2306. updateFragments();
  2307. // Update the URL hash
  2308. writeURL();
  2309. cueAutoSlide();
  2310. }
  2311. /**
  2312. * Syncs the presentation with the current DOM. Useful
  2313. * when new slides or control elements are added or when
  2314. * the configuration has changed.
  2315. */
  2316. function sync() {
  2317. // Subscribe to input
  2318. removeEventListeners();
  2319. addEventListeners();
  2320. // Force a layout to make sure the current config is accounted for
  2321. layout();
  2322. // Reflect the current autoSlide value
  2323. autoSlide = config.autoSlide;
  2324. // Start auto-sliding if it's enabled
  2325. cueAutoSlide();
  2326. // Re-create the slide backgrounds
  2327. createBackgrounds();
  2328. // Write the current hash to the URL
  2329. writeURL();
  2330. sortAllFragments();
  2331. updateControls();
  2332. updateProgress();
  2333. updateSlideNumber();
  2334. updateSlidesVisibility();
  2335. updateBackground( true );
  2336. updateNotesVisibility();
  2337. updateNotes();
  2338. formatEmbeddedContent();
  2339. // Start or stop embedded content depending on global config
  2340. if( config.autoPlayMedia === false ) {
  2341. stopEmbeddedContent( currentSlide, { unloadIframes: false } );
  2342. }
  2343. else {
  2344. startEmbeddedContent( currentSlide );
  2345. }
  2346. if( isOverview() ) {
  2347. layoutOverview();
  2348. }
  2349. }
  2350. /**
  2351. * Updates reveal.js to keep in sync with new slide attributes. For
  2352. * example, if you add a new `data-background-image` you can call
  2353. * this to have reveal.js render the new background image.
  2354. *
  2355. * Similar to #sync() but more efficient when you only need to
  2356. * refresh a specific slide.
  2357. *
  2358. * @param {HTMLElement} slide
  2359. */
  2360. function syncSlide( slide ) {
  2361. // Default to the current slide
  2362. slide = slide || currentSlide;
  2363. syncBackground( slide );
  2364. syncFragments( slide );
  2365. updateBackground();
  2366. updateNotes();
  2367. loadSlide( slide );
  2368. }
  2369. /**
  2370. * Formats the fragments on the given slide so that they have
  2371. * valid indices. Call this if fragments are changed in the DOM
  2372. * after reveal.js has already initialized.
  2373. *
  2374. * @param {HTMLElement} slide
  2375. * @return {Array} a list of the HTML fragments that were synced
  2376. */
  2377. function syncFragments( slide ) {
  2378. // Default to the current slide
  2379. slide = slide || currentSlide;
  2380. return sortFragments( slide.querySelectorAll( '.fragment' ) );
  2381. }
  2382. /**
  2383. * Resets all vertical slides so that only the first
  2384. * is visible.
  2385. */
  2386. function resetVerticalSlides() {
  2387. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2388. horizontalSlides.forEach( function( horizontalSlide ) {
  2389. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2390. verticalSlides.forEach( function( verticalSlide, y ) {
  2391. if( y > 0 ) {
  2392. verticalSlide.classList.remove( 'present' );
  2393. verticalSlide.classList.remove( 'past' );
  2394. verticalSlide.classList.add( 'future' );
  2395. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  2396. }
  2397. } );
  2398. } );
  2399. }
  2400. /**
  2401. * Sorts and formats all of fragments in the
  2402. * presentation.
  2403. */
  2404. function sortAllFragments() {
  2405. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2406. horizontalSlides.forEach( function( horizontalSlide ) {
  2407. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2408. verticalSlides.forEach( function( verticalSlide, y ) {
  2409. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  2410. } );
  2411. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  2412. } );
  2413. }
  2414. /**
  2415. * Randomly shuffles all slides in the deck.
  2416. */
  2417. function shuffle() {
  2418. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2419. slides.forEach( function( slide ) {
  2420. // Insert this slide next to another random slide. This may
  2421. // cause the slide to insert before itself but that's fine.
  2422. dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
  2423. } );
  2424. }
  2425. /**
  2426. * Updates one dimension of slides by showing the slide
  2427. * with the specified index.
  2428. *
  2429. * @param {string} selector A CSS selector that will fetch
  2430. * the group of slides we are working with
  2431. * @param {number} index The index of the slide that should be
  2432. * shown
  2433. *
  2434. * @return {number} The index of the slide that is now shown,
  2435. * might differ from the passed in index if it was out of
  2436. * bounds.
  2437. */
  2438. function updateSlides( selector, index ) {
  2439. // Select all slides and convert the NodeList result to
  2440. // an array
  2441. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  2442. slidesLength = slides.length;
  2443. var printMode = isPrintingPDF();
  2444. if( slidesLength ) {
  2445. // Should the index loop?
  2446. if( config.loop ) {
  2447. index %= slidesLength;
  2448. if( index < 0 ) {
  2449. index = slidesLength + index;
  2450. }
  2451. }
  2452. // Enforce max and minimum index bounds
  2453. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  2454. for( var i = 0; i < slidesLength; i++ ) {
  2455. var element = slides[i];
  2456. var reverse = config.rtl && !isVerticalSlide( element );
  2457. element.classList.remove( 'past' );
  2458. element.classList.remove( 'present' );
  2459. element.classList.remove( 'future' );
  2460. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  2461. element.setAttribute( 'hidden', '' );
  2462. element.setAttribute( 'aria-hidden', 'true' );
  2463. // If this element contains vertical slides
  2464. if( element.querySelector( 'section' ) ) {
  2465. element.classList.add( 'stack' );
  2466. }
  2467. // If we're printing static slides, all slides are "present"
  2468. if( printMode ) {
  2469. element.classList.add( 'present' );
  2470. continue;
  2471. }
  2472. if( i < index ) {
  2473. // Any element previous to index is given the 'past' class
  2474. element.classList.add( reverse ? 'future' : 'past' );
  2475. if( config.fragments ) {
  2476. // Show all fragments in prior slides
  2477. toArray( element.querySelectorAll( '.fragment' ) ).forEach( function( fragment ) {
  2478. fragment.classList.add( 'visible' );
  2479. fragment.classList.remove( 'current-fragment' );
  2480. } );
  2481. }
  2482. }
  2483. else if( i > index ) {
  2484. // Any element subsequent to index is given the 'future' class
  2485. element.classList.add( reverse ? 'past' : 'future' );
  2486. if( config.fragments ) {
  2487. // Hide all fragments in future slides
  2488. toArray( element.querySelectorAll( '.fragment.visible' ) ).forEach( function( fragment ) {
  2489. fragment.classList.remove( 'visible' );
  2490. fragment.classList.remove( 'current-fragment' );
  2491. } );
  2492. }
  2493. }
  2494. }
  2495. // Mark the current slide as present
  2496. slides[index].classList.add( 'present' );
  2497. slides[index].removeAttribute( 'hidden' );
  2498. slides[index].removeAttribute( 'aria-hidden' );
  2499. // If this slide has a state associated with it, add it
  2500. // onto the current state of the deck
  2501. var slideState = slides[index].getAttribute( 'data-state' );
  2502. if( slideState ) {
  2503. state = state.concat( slideState.split( ' ' ) );
  2504. }
  2505. }
  2506. else {
  2507. // Since there are no slides we can't be anywhere beyond the
  2508. // zeroth index
  2509. index = 0;
  2510. }
  2511. return index;
  2512. }
  2513. /**
  2514. * Optimization method; hide all slides that are far away
  2515. * from the present slide.
  2516. */
  2517. function updateSlidesVisibility() {
  2518. // Select all slides and convert the NodeList result to
  2519. // an array
  2520. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  2521. horizontalSlidesLength = horizontalSlides.length,
  2522. distanceX,
  2523. distanceY;
  2524. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  2525. // The number of steps away from the present slide that will
  2526. // be visible
  2527. var viewDistance = isOverview() ? 10 : config.viewDistance;
  2528. // Limit view distance on weaker devices
  2529. if( isMobileDevice ) {
  2530. viewDistance = isOverview() ? 6 : 2;
  2531. }
  2532. // All slides need to be visible when exporting to PDF
  2533. if( isPrintingPDF() ) {
  2534. viewDistance = Number.MAX_VALUE;
  2535. }
  2536. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  2537. var horizontalSlide = horizontalSlides[x];
  2538. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  2539. verticalSlidesLength = verticalSlides.length;
  2540. // Determine how far away this slide is from the present
  2541. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  2542. // If the presentation is looped, distance should measure
  2543. // 1 between the first and last slides
  2544. if( config.loop ) {
  2545. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  2546. }
  2547. // Show the horizontal slide if it's within the view distance
  2548. if( distanceX < viewDistance ) {
  2549. loadSlide( horizontalSlide );
  2550. }
  2551. else {
  2552. unloadSlide( horizontalSlide );
  2553. }
  2554. if( verticalSlidesLength ) {
  2555. var oy = getPreviousVerticalIndex( horizontalSlide );
  2556. for( var y = 0; y < verticalSlidesLength; y++ ) {
  2557. var verticalSlide = verticalSlides[y];
  2558. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  2559. if( distanceX + distanceY < viewDistance ) {
  2560. loadSlide( verticalSlide );
  2561. }
  2562. else {
  2563. unloadSlide( verticalSlide );
  2564. }
  2565. }
  2566. }
  2567. }
  2568. // Flag if there are ANY vertical slides, anywhere in the deck
  2569. if( dom.wrapper.querySelectorAll( '.slides>section>section' ).length ) {
  2570. dom.wrapper.classList.add( 'has-vertical-slides' );
  2571. }
  2572. else {
  2573. dom.wrapper.classList.remove( 'has-vertical-slides' );
  2574. }
  2575. // Flag if there are ANY horizontal slides, anywhere in the deck
  2576. if( dom.wrapper.querySelectorAll( '.slides>section' ).length > 1 ) {
  2577. dom.wrapper.classList.add( 'has-horizontal-slides' );
  2578. }
  2579. else {
  2580. dom.wrapper.classList.remove( 'has-horizontal-slides' );
  2581. }
  2582. }
  2583. }
  2584. /**
  2585. * Pick up notes from the current slide and display them
  2586. * to the viewer.
  2587. *
  2588. * @see {@link config.showNotes}
  2589. */
  2590. function updateNotes() {
  2591. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  2592. dom.speakerNotes.innerHTML = getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
  2593. }
  2594. }
  2595. /**
  2596. * Updates the visibility of the speaker notes sidebar that
  2597. * is used to share annotated slides. The notes sidebar is
  2598. * only visible if showNotes is true and there are notes on
  2599. * one or more slides in the deck.
  2600. */
  2601. function updateNotesVisibility() {
  2602. if( config.showNotes && hasNotes() ) {
  2603. dom.wrapper.classList.add( 'show-notes' );
  2604. }
  2605. else {
  2606. dom.wrapper.classList.remove( 'show-notes' );
  2607. }
  2608. }
  2609. /**
  2610. * Checks if there are speaker notes for ANY slide in the
  2611. * presentation.
  2612. */
  2613. function hasNotes() {
  2614. return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0;
  2615. }
  2616. /**
  2617. * Updates the progress bar to reflect the current slide.
  2618. */
  2619. function updateProgress() {
  2620. // Update progress if enabled
  2621. if( config.progress && dom.progressbar ) {
  2622. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  2623. }
  2624. }
  2625. /**
  2626. * Updates the slide number to match the current slide.
  2627. */
  2628. function updateSlideNumber() {
  2629. // Update slide number if enabled
  2630. if( config.slideNumber && dom.slideNumber ) {
  2631. var value;
  2632. var format = 'h.v';
  2633. if( typeof config.slideNumber === 'function' ) {
  2634. value = config.slideNumber();
  2635. }
  2636. else {
  2637. // Check if a custom number format is available
  2638. if( typeof config.slideNumber === 'string' ) {
  2639. format = config.slideNumber;
  2640. }
  2641. // If there are ONLY vertical slides in this deck, always use
  2642. // a flattened slide number
  2643. if( !/c/.test( format ) && dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length === 1 ) {
  2644. format = 'c';
  2645. }
  2646. value = [];
  2647. switch( format ) {
  2648. case 'c':
  2649. value.push( getSlidePastCount() + 1 );
  2650. break;
  2651. case 'c/t':
  2652. value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
  2653. break;
  2654. case 'h/v':
  2655. value.push( indexh + 1 );
  2656. if( isVerticalSlide() ) value.push( '/', indexv + 1 );
  2657. break;
  2658. default:
  2659. value.push( indexh + 1 );
  2660. if( isVerticalSlide() ) value.push( '.', indexv + 1 );
  2661. }
  2662. }
  2663. dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
  2664. }
  2665. }
  2666. /**
  2667. * Applies HTML formatting to a slide number before it's
  2668. * written to the DOM.
  2669. *
  2670. * @param {number} a Current slide
  2671. * @param {string} delimiter Character to separate slide numbers
  2672. * @param {(number|*)} b Total slides
  2673. * @return {string} HTML string fragment
  2674. */
  2675. function formatSlideNumber( a, delimiter, b ) {
  2676. var url = '#' + locationHash();
  2677. if( typeof b === 'number' && !isNaN( b ) ) {
  2678. return '<a href="' + url + '">' +
  2679. '<span class="slide-number-a">'+ a +'</span>' +
  2680. '<span class="slide-number-delimiter">'+ delimiter +'</span>' +
  2681. '<span class="slide-number-b">'+ b +'</span>' +
  2682. '</a>';
  2683. }
  2684. else {
  2685. return '<a href="' + url + '">' +
  2686. '<span class="slide-number-a">'+ a +'</span>' +
  2687. '</a>';
  2688. }
  2689. }
  2690. /**
  2691. * Updates the state of all control/navigation arrows.
  2692. */
  2693. function updateControls() {
  2694. var routes = availableRoutes();
  2695. var fragments = availableFragments();
  2696. // Remove the 'enabled' class from all directions
  2697. dom.controlsLeft.concat( dom.controlsRight )
  2698. .concat( dom.controlsUp )
  2699. .concat( dom.controlsDown )
  2700. .concat( dom.controlsPrev )
  2701. .concat( dom.controlsNext ).forEach( function( node ) {
  2702. node.classList.remove( 'enabled' );
  2703. node.classList.remove( 'fragmented' );
  2704. // Set 'disabled' attribute on all directions
  2705. node.setAttribute( 'disabled', 'disabled' );
  2706. } );
  2707. // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
  2708. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2709. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2710. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2711. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2712. // Prev/next buttons
  2713. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2714. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2715. // Highlight fragment directions
  2716. if( currentSlide ) {
  2717. // Always apply fragment decorator to prev/next buttons
  2718. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2719. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2720. // Apply fragment decorators to directional buttons based on
  2721. // what slide axis they are in
  2722. if( isVerticalSlide( currentSlide ) ) {
  2723. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2724. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2725. }
  2726. else {
  2727. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2728. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2729. }
  2730. }
  2731. if( config.controlsTutorial ) {
  2732. // Highlight control arrows with an animation to ensure
  2733. // that the viewer knows how to navigate
  2734. if( !hasNavigatedDown && routes.down ) {
  2735. dom.controlsDownArrow.classList.add( 'highlight' );
  2736. }
  2737. else {
  2738. dom.controlsDownArrow.classList.remove( 'highlight' );
  2739. if( !hasNavigatedRight && routes.right && indexv === 0 ) {
  2740. dom.controlsRightArrow.classList.add( 'highlight' );
  2741. }
  2742. else {
  2743. dom.controlsRightArrow.classList.remove( 'highlight' );
  2744. }
  2745. }
  2746. }
  2747. }
  2748. /**
  2749. * Updates the background elements to reflect the current
  2750. * slide.
  2751. *
  2752. * @param {boolean} includeAll If true, the backgrounds of
  2753. * all vertical slides (not just the present) will be updated.
  2754. */
  2755. function updateBackground( includeAll ) {
  2756. var currentBackground = null;
  2757. // Reverse past/future classes when in RTL mode
  2758. var horizontalPast = config.rtl ? 'future' : 'past',
  2759. horizontalFuture = config.rtl ? 'past' : 'future';
  2760. // Update the classes of all backgrounds to match the
  2761. // states of their slides (past/present/future)
  2762. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2763. backgroundh.classList.remove( 'past' );
  2764. backgroundh.classList.remove( 'present' );
  2765. backgroundh.classList.remove( 'future' );
  2766. if( h < indexh ) {
  2767. backgroundh.classList.add( horizontalPast );
  2768. }
  2769. else if ( h > indexh ) {
  2770. backgroundh.classList.add( horizontalFuture );
  2771. }
  2772. else {
  2773. backgroundh.classList.add( 'present' );
  2774. // Store a reference to the current background element
  2775. currentBackground = backgroundh;
  2776. }
  2777. if( includeAll || h === indexh ) {
  2778. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2779. backgroundv.classList.remove( 'past' );
  2780. backgroundv.classList.remove( 'present' );
  2781. backgroundv.classList.remove( 'future' );
  2782. if( v < indexv ) {
  2783. backgroundv.classList.add( 'past' );
  2784. }
  2785. else if ( v > indexv ) {
  2786. backgroundv.classList.add( 'future' );
  2787. }
  2788. else {
  2789. backgroundv.classList.add( 'present' );
  2790. // Only if this is the present horizontal and vertical slide
  2791. if( h === indexh ) currentBackground = backgroundv;
  2792. }
  2793. } );
  2794. }
  2795. } );
  2796. // Stop content inside of previous backgrounds
  2797. if( previousBackground ) {
  2798. stopEmbeddedContent( previousBackground );
  2799. }
  2800. // Start content in the current background
  2801. if( currentBackground ) {
  2802. startEmbeddedContent( currentBackground );
  2803. var currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
  2804. if( currentBackgroundContent ) {
  2805. var backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';
  2806. // Restart GIFs (doesn't work in Firefox)
  2807. if( /\.gif/i.test( backgroundImageURL ) ) {
  2808. currentBackgroundContent.style.backgroundImage = '';
  2809. window.getComputedStyle( currentBackgroundContent ).opacity;
  2810. currentBackgroundContent.style.backgroundImage = backgroundImageURL;
  2811. }
  2812. }
  2813. // Don't transition between identical backgrounds. This
  2814. // prevents unwanted flicker.
  2815. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2816. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2817. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2818. dom.background.classList.add( 'no-transition' );
  2819. }
  2820. previousBackground = currentBackground;
  2821. }
  2822. // If there's a background brightness flag for this slide,
  2823. // bubble it to the .reveal container
  2824. if( currentSlide ) {
  2825. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2826. if( currentSlide.classList.contains( classToBubble ) ) {
  2827. dom.wrapper.classList.add( classToBubble );
  2828. }
  2829. else {
  2830. dom.wrapper.classList.remove( classToBubble );
  2831. }
  2832. } );
  2833. }
  2834. // Allow the first background to apply without transition
  2835. setTimeout( function() {
  2836. dom.background.classList.remove( 'no-transition' );
  2837. }, 1 );
  2838. }
  2839. /**
  2840. * Updates the position of the parallax background based
  2841. * on the current slide index.
  2842. */
  2843. function updateParallax() {
  2844. if( config.parallaxBackgroundImage ) {
  2845. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2846. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2847. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2848. backgroundWidth, backgroundHeight;
  2849. if( backgroundSize.length === 1 ) {
  2850. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2851. }
  2852. else {
  2853. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2854. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2855. }
  2856. var slideWidth = dom.background.offsetWidth,
  2857. horizontalSlideCount = horizontalSlides.length,
  2858. horizontalOffsetMultiplier,
  2859. horizontalOffset;
  2860. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2861. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2862. }
  2863. else {
  2864. horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
  2865. }
  2866. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2867. var slideHeight = dom.background.offsetHeight,
  2868. verticalSlideCount = verticalSlides.length,
  2869. verticalOffsetMultiplier,
  2870. verticalOffset;
  2871. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2872. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2873. }
  2874. else {
  2875. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2876. }
  2877. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0;
  2878. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2879. }
  2880. }
  2881. /**
  2882. * Should the given element be preloaded?
  2883. * Decides based on local element attributes and global config.
  2884. *
  2885. * @param {HTMLElement} element
  2886. */
  2887. function shouldPreload( element ) {
  2888. // Prefer an explicit global preload setting
  2889. var preload = config.preloadIframes;
  2890. // If no global setting is available, fall back on the element's
  2891. // own preload setting
  2892. if( typeof preload !== 'boolean' ) {
  2893. preload = element.hasAttribute( 'data-preload' );
  2894. }
  2895. return preload;
  2896. }
  2897. /**
  2898. * Called when the given slide is within the configured view
  2899. * distance. Shows the slide element and loads any content
  2900. * that is set to load lazily (data-src).
  2901. *
  2902. * @param {HTMLElement} slide Slide to show
  2903. */
  2904. function loadSlide( slide, options ) {
  2905. options = options || {};
  2906. // Show the slide element
  2907. slide.style.display = config.display;
  2908. // Media elements with data-src attributes
  2909. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
  2910. if( element.tagName !== 'IFRAME' || shouldPreload( element ) ) {
  2911. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2912. element.setAttribute( 'data-lazy-loaded', '' );
  2913. element.removeAttribute( 'data-src' );
  2914. }
  2915. } );
  2916. // Media elements with <source> children
  2917. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2918. var sources = 0;
  2919. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2920. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2921. source.removeAttribute( 'data-src' );
  2922. source.setAttribute( 'data-lazy-loaded', '' );
  2923. sources += 1;
  2924. } );
  2925. // If we rewrote sources for this video/audio element, we need
  2926. // to manually tell it to load from its new origin
  2927. if( sources > 0 ) {
  2928. media.load();
  2929. }
  2930. } );
  2931. // Show the corresponding background element
  2932. var background = slide.slideBackgroundElement;
  2933. if( background ) {
  2934. background.style.display = 'block';
  2935. var backgroundContent = slide.slideBackgroundContentElement;
  2936. // If the background contains media, load it
  2937. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2938. background.setAttribute( 'data-loaded', 'true' );
  2939. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2940. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2941. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2942. backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ),
  2943. backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2944. // Images
  2945. if( backgroundImage ) {
  2946. backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')';
  2947. }
  2948. // Videos
  2949. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2950. var video = document.createElement( 'video' );
  2951. if( backgroundVideoLoop ) {
  2952. video.setAttribute( 'loop', '' );
  2953. }
  2954. if( backgroundVideoMuted ) {
  2955. video.muted = true;
  2956. }
  2957. // Inline video playback works (at least in Mobile Safari) as
  2958. // long as the video is muted and the `playsinline` attribute is
  2959. // present
  2960. if( isMobileDevice ) {
  2961. video.muted = true;
  2962. video.autoplay = true;
  2963. video.setAttribute( 'playsinline', '' );
  2964. }
  2965. // Support comma separated lists of video sources
  2966. backgroundVideo.split( ',' ).forEach( function( source ) {
  2967. video.innerHTML += '<source src="'+ source +'">';
  2968. } );
  2969. backgroundContent.appendChild( video );
  2970. }
  2971. // Iframes
  2972. else if( backgroundIframe && options.excludeIframes !== true ) {
  2973. var iframe = document.createElement( 'iframe' );
  2974. iframe.setAttribute( 'allowfullscreen', '' );
  2975. iframe.setAttribute( 'mozallowfullscreen', '' );
  2976. iframe.setAttribute( 'webkitallowfullscreen', '' );
  2977. // Only load autoplaying content when the slide is shown to
  2978. // avoid having it play in the background
  2979. if( /autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
  2980. iframe.setAttribute( 'data-src', backgroundIframe );
  2981. }
  2982. else {
  2983. iframe.setAttribute( 'src', backgroundIframe );
  2984. }
  2985. iframe.style.width = '100%';
  2986. iframe.style.height = '100%';
  2987. iframe.style.maxHeight = '100%';
  2988. iframe.style.maxWidth = '100%';
  2989. backgroundContent.appendChild( iframe );
  2990. }
  2991. }
  2992. }
  2993. }
  2994. /**
  2995. * Unloads and hides the given slide. This is called when the
  2996. * slide is moved outside of the configured view distance.
  2997. *
  2998. * @param {HTMLElement} slide
  2999. */
  3000. function unloadSlide( slide ) {
  3001. // Hide the slide element
  3002. slide.style.display = 'none';
  3003. // Hide the corresponding background element
  3004. var background = getSlideBackground( slide );
  3005. if( background ) {
  3006. background.style.display = 'none';
  3007. }
  3008. // Reset lazy-loaded media elements with src attributes
  3009. toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ) ).forEach( function( element ) {
  3010. element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
  3011. element.removeAttribute( 'src' );
  3012. } );
  3013. // Reset lazy-loaded media elements with <source> children
  3014. toArray( slide.querySelectorAll( 'video[data-lazy-loaded] source[src], audio source[src]' ) ).forEach( function( source ) {
  3015. source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
  3016. source.removeAttribute( 'src' );
  3017. } );
  3018. }
  3019. /**
  3020. * Determine what available routes there are for navigation.
  3021. *
  3022. * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
  3023. */
  3024. function availableRoutes() {
  3025. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  3026. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  3027. var routes = {
  3028. left: indexh > 0,
  3029. right: indexh < horizontalSlides.length - 1,
  3030. up: indexv > 0,
  3031. down: indexv < verticalSlides.length - 1
  3032. };
  3033. // Looped presentations can always be navigated as long as
  3034. // there are slides available
  3035. if( config.loop ) {
  3036. if( horizontalSlides.length > 1 ) {
  3037. routes.left = true;
  3038. routes.right = true;
  3039. }
  3040. if( verticalSlides.length > 1 ) {
  3041. routes.up = true;
  3042. routes.down = true;
  3043. }
  3044. }
  3045. // Reverse horizontal controls for rtl
  3046. if( config.rtl ) {
  3047. var left = routes.left;
  3048. routes.left = routes.right;
  3049. routes.right = left;
  3050. }
  3051. return routes;
  3052. }
  3053. /**
  3054. * Returns an object describing the available fragment
  3055. * directions.
  3056. *
  3057. * @return {{prev: boolean, next: boolean}}
  3058. */
  3059. function availableFragments() {
  3060. if( currentSlide && config.fragments ) {
  3061. var fragments = currentSlide.querySelectorAll( '.fragment' );
  3062. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  3063. return {
  3064. prev: fragments.length - hiddenFragments.length > 0,
  3065. next: !!hiddenFragments.length
  3066. };
  3067. }
  3068. else {
  3069. return { prev: false, next: false };
  3070. }
  3071. }
  3072. /**
  3073. * Enforces origin-specific format rules for embedded media.
  3074. */
  3075. function formatEmbeddedContent() {
  3076. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  3077. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  3078. var src = el.getAttribute( sourceAttribute );
  3079. if( src && src.indexOf( param ) === -1 ) {
  3080. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  3081. }
  3082. });
  3083. };
  3084. // YouTube frames must include "?enablejsapi=1"
  3085. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  3086. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  3087. // Vimeo frames must include "?api=1"
  3088. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  3089. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  3090. }
  3091. /**
  3092. * Start playback of any embedded content inside of
  3093. * the given element.
  3094. *
  3095. * @param {HTMLElement} element
  3096. */
  3097. function startEmbeddedContent( element ) {
  3098. if( element && !isSpeakerNotes() ) {
  3099. // Restart GIFs
  3100. toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  3101. // Setting the same unchanged source like this was confirmed
  3102. // to work in Chrome, FF & Safari
  3103. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  3104. } );
  3105. // HTML5 media elements
  3106. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3107. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3108. return;
  3109. }
  3110. // Prefer an explicit global autoplay setting
  3111. var autoplay = config.autoPlayMedia;
  3112. // If no global setting is available, fall back on the element's
  3113. // own autoplay setting
  3114. if( typeof autoplay !== 'boolean' ) {
  3115. autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
  3116. }
  3117. if( autoplay && typeof el.play === 'function' ) {
  3118. // If the media is ready, start playback
  3119. if( el.readyState > 1 ) {
  3120. startEmbeddedMedia( { target: el } );
  3121. }
  3122. // Mobile devices never fire a loaded event so instead
  3123. // of waiting, we initiate playback
  3124. else if( isMobileDevice ) {
  3125. var promise = el.play();
  3126. // If autoplay does not work, ensure that the controls are visible so
  3127. // that the viewer can start the media on their own
  3128. if( promise && typeof promise.catch === 'function' && el.controls === false ) {
  3129. promise.catch( function() {
  3130. el.controls = true;
  3131. // Once the video does start playing, hide the controls again
  3132. el.addEventListener( 'play', function() {
  3133. el.controls = false;
  3134. } );
  3135. } );
  3136. }
  3137. }
  3138. // If the media isn't loaded, wait before playing
  3139. else {
  3140. el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes
  3141. el.addEventListener( 'loadeddata', startEmbeddedMedia );
  3142. }
  3143. }
  3144. } );
  3145. // Normal iframes
  3146. toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  3147. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3148. return;
  3149. }
  3150. startEmbeddedIframe( { target: el } );
  3151. } );
  3152. // Lazy loading iframes
  3153. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3154. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3155. return;
  3156. }
  3157. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  3158. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  3159. el.addEventListener( 'load', startEmbeddedIframe );
  3160. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  3161. }
  3162. } );
  3163. }
  3164. }
  3165. /**
  3166. * Starts playing an embedded video/audio element after
  3167. * it has finished loading.
  3168. *
  3169. * @param {object} event
  3170. */
  3171. function startEmbeddedMedia( event ) {
  3172. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3173. isVisible = !!closestParent( event.target, '.present' );
  3174. if( isAttachedToDOM && isVisible ) {
  3175. event.target.currentTime = 0;
  3176. event.target.play();
  3177. }
  3178. event.target.removeEventListener( 'loadeddata', startEmbeddedMedia );
  3179. }
  3180. /**
  3181. * "Starts" the content of an embedded iframe using the
  3182. * postMessage API.
  3183. *
  3184. * @param {object} event
  3185. */
  3186. function startEmbeddedIframe( event ) {
  3187. var iframe = event.target;
  3188. if( iframe && iframe.contentWindow ) {
  3189. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3190. isVisible = !!closestParent( event.target, '.present' );
  3191. if( isAttachedToDOM && isVisible ) {
  3192. // Prefer an explicit global autoplay setting
  3193. var autoplay = config.autoPlayMedia;
  3194. // If no global setting is available, fall back on the element's
  3195. // own autoplay setting
  3196. if( typeof autoplay !== 'boolean' ) {
  3197. autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
  3198. }
  3199. // YouTube postMessage API
  3200. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3201. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  3202. }
  3203. // Vimeo postMessage API
  3204. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3205. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  3206. }
  3207. // Generic postMessage API
  3208. else {
  3209. iframe.contentWindow.postMessage( 'slide:start', '*' );
  3210. }
  3211. }
  3212. }
  3213. }
  3214. /**
  3215. * Stop playback of any embedded content inside of
  3216. * the targeted slide.
  3217. *
  3218. * @param {HTMLElement} element
  3219. */
  3220. function stopEmbeddedContent( element, options ) {
  3221. options = extend( {
  3222. // Defaults
  3223. unloadIframes: true
  3224. }, options || {} );
  3225. if( element && element.parentNode ) {
  3226. // HTML5 media elements
  3227. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3228. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  3229. el.setAttribute('data-paused-by-reveal', '');
  3230. el.pause();
  3231. }
  3232. } );
  3233. // Generic postMessage API for non-lazy loaded iframes
  3234. toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  3235. if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
  3236. el.removeEventListener( 'load', startEmbeddedIframe );
  3237. });
  3238. // YouTube postMessage API
  3239. toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  3240. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3241. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  3242. }
  3243. });
  3244. // Vimeo postMessage API
  3245. toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  3246. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3247. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  3248. }
  3249. });
  3250. if( options.unloadIframes === true ) {
  3251. // Unload lazy-loaded iframes
  3252. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3253. // Only removing the src doesn't actually unload the frame
  3254. // in all browsers (Firefox) so we set it to blank first
  3255. el.setAttribute( 'src', 'about:blank' );
  3256. el.removeAttribute( 'src' );
  3257. } );
  3258. }
  3259. }
  3260. }
  3261. /**
  3262. * Returns the number of past slides. This can be used as a global
  3263. * flattened index for slides.
  3264. *
  3265. * @return {number} Past slide count
  3266. */
  3267. function getSlidePastCount() {
  3268. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3269. // The number of past slides
  3270. var pastCount = 0;
  3271. // Step through all slides and count the past ones
  3272. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  3273. var horizontalSlide = horizontalSlides[i];
  3274. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  3275. for( var j = 0; j < verticalSlides.length; j++ ) {
  3276. // Stop as soon as we arrive at the present
  3277. if( verticalSlides[j].classList.contains( 'present' ) ) {
  3278. break mainLoop;
  3279. }
  3280. pastCount++;
  3281. }
  3282. // Stop as soon as we arrive at the present
  3283. if( horizontalSlide.classList.contains( 'present' ) ) {
  3284. break;
  3285. }
  3286. // Don't count the wrapping section for vertical slides
  3287. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  3288. pastCount++;
  3289. }
  3290. }
  3291. return pastCount;
  3292. }
  3293. /**
  3294. * Returns a value ranging from 0-1 that represents
  3295. * how far into the presentation we have navigated.
  3296. *
  3297. * @return {number}
  3298. */
  3299. function getProgress() {
  3300. // The number of past and total slides
  3301. var totalCount = getTotalSlides();
  3302. var pastCount = getSlidePastCount();
  3303. if( currentSlide ) {
  3304. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  3305. // If there are fragments in the current slide those should be
  3306. // accounted for in the progress.
  3307. if( allFragments.length > 0 ) {
  3308. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  3309. // This value represents how big a portion of the slide progress
  3310. // that is made up by its fragments (0-1)
  3311. var fragmentWeight = 0.9;
  3312. // Add fragment progress to the past slide count
  3313. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  3314. }
  3315. }
  3316. return Math.min( pastCount / ( totalCount - 1 ), 1 );
  3317. }
  3318. /**
  3319. * Checks if this presentation is running inside of the
  3320. * speaker notes window.
  3321. *
  3322. * @return {boolean}
  3323. */
  3324. function isSpeakerNotes() {
  3325. return !!window.location.search.match( /receiver/gi );
  3326. }
  3327. /**
  3328. * Reads the current URL (hash) and navigates accordingly.
  3329. */
  3330. function readURL() {
  3331. var hash = window.location.hash;
  3332. // Attempt to parse the hash as either an index or name
  3333. var bits = hash.slice( 2 ).split( '/' ),
  3334. name = hash.replace( /#|\//gi, '' );
  3335. // If the first bit is not fully numeric and there is a name we
  3336. // can assume that this is a named link
  3337. if( !/^[0-9]*$/.test( bits[0] ) && name.length ) {
  3338. var element;
  3339. // Ensure the named link is a valid HTML ID attribute
  3340. try {
  3341. element = document.getElementById( decodeURIComponent( name ) );
  3342. }
  3343. catch ( error ) { }
  3344. // Ensure that we're not already on a slide with the same name
  3345. var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
  3346. if( element ) {
  3347. // If the slide exists and is not the current slide...
  3348. if ( !isSameNameAsCurrentSlide ) {
  3349. // ...find the position of the named slide and navigate to it
  3350. var indices = Reveal.getIndices(element);
  3351. slide(indices.h, indices.v);
  3352. }
  3353. }
  3354. // If the slide doesn't exist, navigate to the current slide
  3355. else {
  3356. slide( indexh || 0, indexv || 0 );
  3357. }
  3358. }
  3359. else {
  3360. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  3361. // Read the index components of the hash
  3362. var h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,
  3363. v = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,
  3364. f;
  3365. if( config.fragmentInURL ) {
  3366. f = parseInt( bits[2], 10 );
  3367. if( isNaN( f ) ) {
  3368. f = undefined;
  3369. }
  3370. }
  3371. if( h !== indexh || v !== indexv || f !== undefined ) {
  3372. slide( h, v, f );
  3373. }
  3374. }
  3375. }
  3376. /**
  3377. * Updates the page URL (hash) to reflect the current
  3378. * state.
  3379. *
  3380. * @param {number} delay The time in ms to wait before
  3381. * writing the hash
  3382. */
  3383. function writeURL( delay ) {
  3384. // Make sure there's never more than one timeout running
  3385. clearTimeout( writeURLTimeout );
  3386. // If a delay is specified, timeout this call
  3387. if( typeof delay === 'number' ) {
  3388. writeURLTimeout = setTimeout( writeURL, delay );
  3389. }
  3390. else if( currentSlide ) {
  3391. // If we're configured to push to history OR the history
  3392. // API is not avaialble.
  3393. if( config.history || !window.history ) {
  3394. window.location.hash = locationHash();
  3395. }
  3396. // If we're configured to refelct the current slide in the
  3397. // URL without pushing to history.
  3398. else if( config.hash ) {
  3399. window.history.replaceState( null, null, '#' + locationHash() );
  3400. }
  3401. // If history and hash are both disabled, a hash may still
  3402. // be added to the URL by clicking on a href with a hash
  3403. // target. Counter this by always removing the hash.
  3404. else {
  3405. window.history.replaceState( null, null, window.location.pathname + window.location.search );
  3406. }
  3407. }
  3408. }
  3409. /**
  3410. * Retrieves the h/v location and fragment of the current,
  3411. * or specified, slide.
  3412. *
  3413. * @param {HTMLElement} [slide] If specified, the returned
  3414. * index will be for this slide rather than the currently
  3415. * active one
  3416. *
  3417. * @return {{h: number, v: number, f: number}}
  3418. */
  3419. function getIndices( slide ) {
  3420. // By default, return the current indices
  3421. var h = indexh,
  3422. v = indexv,
  3423. f;
  3424. // If a slide is specified, return the indices of that slide
  3425. if( slide ) {
  3426. var isVertical = isVerticalSlide( slide );
  3427. var slideh = isVertical ? slide.parentNode : slide;
  3428. // Select all horizontal slides
  3429. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3430. // Now that we know which the horizontal slide is, get its index
  3431. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  3432. // Assume we're not vertical
  3433. v = undefined;
  3434. // If this is a vertical slide, grab the vertical index
  3435. if( isVertical ) {
  3436. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  3437. }
  3438. }
  3439. if( !slide && currentSlide ) {
  3440. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  3441. if( hasFragments ) {
  3442. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  3443. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  3444. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  3445. }
  3446. else {
  3447. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  3448. }
  3449. }
  3450. }
  3451. return { h: h, v: v, f: f };
  3452. }
  3453. /**
  3454. * Retrieves all slides in this presentation.
  3455. */
  3456. function getSlides() {
  3457. return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ));
  3458. }
  3459. /**
  3460. * Returns an array of objects where each object represents the
  3461. * attributes on its respective slide.
  3462. */
  3463. function getSlidesAttributes() {
  3464. return getSlides().map( function( slide ) {
  3465. var attributes = {};
  3466. for( var i = 0; i < slide.attributes.length; i++ ) {
  3467. var attribute = slide.attributes[ i ];
  3468. attributes[ attribute.name ] = attribute.value;
  3469. }
  3470. return attributes;
  3471. } );
  3472. }
  3473. /**
  3474. * Retrieves the total number of slides in this presentation.
  3475. *
  3476. * @return {number}
  3477. */
  3478. function getTotalSlides() {
  3479. return getSlides().length;
  3480. }
  3481. /**
  3482. * Returns the slide element matching the specified index.
  3483. *
  3484. * @return {HTMLElement}
  3485. */
  3486. function getSlide( x, y ) {
  3487. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  3488. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  3489. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  3490. return verticalSlides ? verticalSlides[ y ] : undefined;
  3491. }
  3492. return horizontalSlide;
  3493. }
  3494. /**
  3495. * Returns the background element for the given slide.
  3496. * All slides, even the ones with no background properties
  3497. * defined, have a background element so as long as the
  3498. * index is valid an element will be returned.
  3499. *
  3500. * @param {mixed} x Horizontal background index OR a slide
  3501. * HTML element
  3502. * @param {number} y Vertical background index
  3503. * @return {(HTMLElement[]|*)}
  3504. */
  3505. function getSlideBackground( x, y ) {
  3506. var slide = typeof x === 'number' ? getSlide( x, y ) : x;
  3507. if( slide ) {
  3508. return slide.slideBackgroundElement;
  3509. }
  3510. return undefined;
  3511. }
  3512. /**
  3513. * Retrieves the speaker notes from a slide. Notes can be
  3514. * defined in two ways:
  3515. * 1. As a data-notes attribute on the slide <section>
  3516. * 2. As an <aside class="notes"> inside of the slide
  3517. *
  3518. * @param {HTMLElement} [slide=currentSlide]
  3519. * @return {(string|null)}
  3520. */
  3521. function getSlideNotes( slide ) {
  3522. // Default to the current slide
  3523. slide = slide || currentSlide;
  3524. // Notes can be specified via the data-notes attribute...
  3525. if( slide.hasAttribute( 'data-notes' ) ) {
  3526. return slide.getAttribute( 'data-notes' );
  3527. }
  3528. // ... or using an <aside class="notes"> element
  3529. var notesElement = slide.querySelector( 'aside.notes' );
  3530. if( notesElement ) {
  3531. return notesElement.innerHTML;
  3532. }
  3533. return null;
  3534. }
  3535. /**
  3536. * Retrieves the current state of the presentation as
  3537. * an object. This state can then be restored at any
  3538. * time.
  3539. *
  3540. * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
  3541. */
  3542. function getState() {
  3543. var indices = getIndices();
  3544. return {
  3545. indexh: indices.h,
  3546. indexv: indices.v,
  3547. indexf: indices.f,
  3548. paused: isPaused(),
  3549. overview: isOverview()
  3550. };
  3551. }
  3552. /**
  3553. * Restores the presentation to the given state.
  3554. *
  3555. * @param {object} state As generated by getState()
  3556. * @see {@link getState} generates the parameter `state`
  3557. */
  3558. function setState( state ) {
  3559. if( typeof state === 'object' ) {
  3560. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  3561. var pausedFlag = deserialize( state.paused ),
  3562. overviewFlag = deserialize( state.overview );
  3563. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  3564. togglePause( pausedFlag );
  3565. }
  3566. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  3567. toggleOverview( overviewFlag );
  3568. }
  3569. }
  3570. }
  3571. /**
  3572. * Return a sorted fragments list, ordered by an increasing
  3573. * "data-fragment-index" attribute.
  3574. *
  3575. * Fragments will be revealed in the order that they are returned by
  3576. * this function, so you can use the index attributes to control the
  3577. * order of fragment appearance.
  3578. *
  3579. * To maintain a sensible default fragment order, fragments are presumed
  3580. * to be passed in document order. This function adds a "fragment-index"
  3581. * attribute to each node if such an attribute is not already present,
  3582. * and sets that attribute to an integer value which is the position of
  3583. * the fragment within the fragments list.
  3584. *
  3585. * @param {object[]|*} fragments
  3586. * @param {boolean} grouped If true the returned array will contain
  3587. * nested arrays for all fragments with the same index
  3588. * @return {object[]} sorted Sorted array of fragments
  3589. */
  3590. function sortFragments( fragments, grouped ) {
  3591. fragments = toArray( fragments );
  3592. var ordered = [],
  3593. unordered = [],
  3594. sorted = [];
  3595. // Group ordered and unordered elements
  3596. fragments.forEach( function( fragment, i ) {
  3597. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  3598. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  3599. if( !ordered[index] ) {
  3600. ordered[index] = [];
  3601. }
  3602. ordered[index].push( fragment );
  3603. }
  3604. else {
  3605. unordered.push( [ fragment ] );
  3606. }
  3607. } );
  3608. // Append fragments without explicit indices in their
  3609. // DOM order
  3610. ordered = ordered.concat( unordered );
  3611. // Manually count the index up per group to ensure there
  3612. // are no gaps
  3613. var index = 0;
  3614. // Push all fragments in their sorted order to an array,
  3615. // this flattens the groups
  3616. ordered.forEach( function( group ) {
  3617. group.forEach( function( fragment ) {
  3618. sorted.push( fragment );
  3619. fragment.setAttribute( 'data-fragment-index', index );
  3620. } );
  3621. index ++;
  3622. } );
  3623. return grouped === true ? ordered : sorted;
  3624. }
  3625. /**
  3626. * Refreshes the fragments on the current slide so that they
  3627. * have the appropriate classes (.visible + .current-fragment).
  3628. *
  3629. * @param {number} [index] The index of the current fragment
  3630. * @param {array} [fragments] Array containing all fragments
  3631. * in the current slide
  3632. *
  3633. * @return {{shown: array, hidden: array}}
  3634. */
  3635. function updateFragments( index, fragments ) {
  3636. var changedFragments = {
  3637. shown: [],
  3638. hidden: []
  3639. };
  3640. if( currentSlide && config.fragments ) {
  3641. fragments = fragments || sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3642. if( fragments.length ) {
  3643. if( typeof index !== 'number' ) {
  3644. var currentFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3645. if( currentFragment ) {
  3646. index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3647. }
  3648. }
  3649. toArray( fragments ).forEach( function( el, i ) {
  3650. if( el.hasAttribute( 'data-fragment-index' ) ) {
  3651. i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
  3652. }
  3653. // Visible fragments
  3654. if( i <= index ) {
  3655. if( !el.classList.contains( 'visible' ) ) changedFragments.shown.push( el );
  3656. el.classList.add( 'visible' );
  3657. el.classList.remove( 'current-fragment' );
  3658. // Announce the fragments one by one to the Screen Reader
  3659. dom.statusDiv.textContent = getStatusText( el );
  3660. if( i === index ) {
  3661. el.classList.add( 'current-fragment' );
  3662. startEmbeddedContent( el );
  3663. }
  3664. }
  3665. // Hidden fragments
  3666. else {
  3667. if( el.classList.contains( 'visible' ) ) changedFragments.hidden.push( el );
  3668. el.classList.remove( 'visible' );
  3669. el.classList.remove( 'current-fragment' );
  3670. }
  3671. } );
  3672. }
  3673. }
  3674. return changedFragments;
  3675. }
  3676. /**
  3677. * Navigate to the specified slide fragment.
  3678. *
  3679. * @param {?number} index The index of the fragment that
  3680. * should be shown, -1 means all are invisible
  3681. * @param {number} offset Integer offset to apply to the
  3682. * fragment index
  3683. *
  3684. * @return {boolean} true if a change was made in any
  3685. * fragments visibility as part of this call
  3686. */
  3687. function navigateFragment( index, offset ) {
  3688. if( currentSlide && config.fragments ) {
  3689. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3690. if( fragments.length ) {
  3691. // If no index is specified, find the current
  3692. if( typeof index !== 'number' ) {
  3693. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3694. if( lastVisibleFragment ) {
  3695. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3696. }
  3697. else {
  3698. index = -1;
  3699. }
  3700. }
  3701. // If an offset is specified, apply it to the index
  3702. if( typeof offset === 'number' ) {
  3703. index += offset;
  3704. }
  3705. var changedFragments = updateFragments( index, fragments );
  3706. if( changedFragments.hidden.length ) {
  3707. dispatchEvent( 'fragmenthidden', { fragment: changedFragments.hidden[0], fragments: changedFragments.hidden } );
  3708. }
  3709. if( changedFragments.shown.length ) {
  3710. dispatchEvent( 'fragmentshown', { fragment: changedFragments.shown[0], fragments: changedFragments.shown } );
  3711. }
  3712. updateControls();
  3713. updateProgress();
  3714. if( config.fragmentInURL ) {
  3715. writeURL();
  3716. }
  3717. return !!( changedFragments.shown.length || changedFragments.hidden.length );
  3718. }
  3719. }
  3720. return false;
  3721. }
  3722. /**
  3723. * Navigate to the next slide fragment.
  3724. *
  3725. * @return {boolean} true if there was a next fragment,
  3726. * false otherwise
  3727. */
  3728. function nextFragment() {
  3729. return navigateFragment( null, 1 );
  3730. }
  3731. /**
  3732. * Navigate to the previous slide fragment.
  3733. *
  3734. * @return {boolean} true if there was a previous fragment,
  3735. * false otherwise
  3736. */
  3737. function previousFragment() {
  3738. return navigateFragment( null, -1 );
  3739. }
  3740. /**
  3741. * Cues a new automated slide if enabled in the config.
  3742. */
  3743. function cueAutoSlide() {
  3744. cancelAutoSlide();
  3745. if( currentSlide && config.autoSlide !== false ) {
  3746. var fragment = currentSlide.querySelector( '.current-fragment' );
  3747. // When the slide first appears there is no "current" fragment so
  3748. // we look for a data-autoslide timing on the first fragment
  3749. if( !fragment ) fragment = currentSlide.querySelector( '.fragment' );
  3750. var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
  3751. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  3752. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  3753. // Pick value in the following priority order:
  3754. // 1. Current fragment's data-autoslide
  3755. // 2. Current slide's data-autoslide
  3756. // 3. Parent slide's data-autoslide
  3757. // 4. Global autoSlide setting
  3758. if( fragmentAutoSlide ) {
  3759. autoSlide = parseInt( fragmentAutoSlide, 10 );
  3760. }
  3761. else if( slideAutoSlide ) {
  3762. autoSlide = parseInt( slideAutoSlide, 10 );
  3763. }
  3764. else if( parentAutoSlide ) {
  3765. autoSlide = parseInt( parentAutoSlide, 10 );
  3766. }
  3767. else {
  3768. autoSlide = config.autoSlide;
  3769. }
  3770. // If there are media elements with data-autoplay,
  3771. // automatically set the autoSlide duration to the
  3772. // length of that media. Not applicable if the slide
  3773. // is divided up into fragments.
  3774. // playbackRate is accounted for in the duration.
  3775. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  3776. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3777. if( el.hasAttribute( 'data-autoplay' ) ) {
  3778. if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
  3779. autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
  3780. }
  3781. }
  3782. } );
  3783. }
  3784. // Cue the next auto-slide if:
  3785. // - There is an autoSlide value
  3786. // - Auto-sliding isn't paused by the user
  3787. // - The presentation isn't paused
  3788. // - The overview isn't active
  3789. // - The presentation isn't over
  3790. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  3791. autoSlideTimeout = setTimeout( function() {
  3792. typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
  3793. cueAutoSlide();
  3794. }, autoSlide );
  3795. autoSlideStartTime = Date.now();
  3796. }
  3797. if( autoSlidePlayer ) {
  3798. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  3799. }
  3800. }
  3801. }
  3802. /**
  3803. * Cancels any ongoing request to auto-slide.
  3804. */
  3805. function cancelAutoSlide() {
  3806. clearTimeout( autoSlideTimeout );
  3807. autoSlideTimeout = -1;
  3808. }
  3809. function pauseAutoSlide() {
  3810. if( autoSlide && !autoSlidePaused ) {
  3811. autoSlidePaused = true;
  3812. dispatchEvent( 'autoslidepaused' );
  3813. clearTimeout( autoSlideTimeout );
  3814. if( autoSlidePlayer ) {
  3815. autoSlidePlayer.setPlaying( false );
  3816. }
  3817. }
  3818. }
  3819. function resumeAutoSlide() {
  3820. if( autoSlide && autoSlidePaused ) {
  3821. autoSlidePaused = false;
  3822. dispatchEvent( 'autoslideresumed' );
  3823. cueAutoSlide();
  3824. }
  3825. }
  3826. function navigateLeft() {
  3827. // Reverse for RTL
  3828. if( config.rtl ) {
  3829. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  3830. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3831. }
  3832. }
  3833. // Normal navigation
  3834. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  3835. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3836. }
  3837. }
  3838. function navigateRight() {
  3839. hasNavigatedRight = true;
  3840. // Reverse for RTL
  3841. if( config.rtl ) {
  3842. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  3843. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3844. }
  3845. }
  3846. // Normal navigation
  3847. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  3848. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3849. }
  3850. }
  3851. function navigateUp() {
  3852. // Prioritize hiding fragments
  3853. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  3854. slide( indexh, indexv - 1 );
  3855. }
  3856. }
  3857. function navigateDown() {
  3858. hasNavigatedDown = true;
  3859. // Prioritize revealing fragments
  3860. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  3861. slide( indexh, indexv + 1 );
  3862. }
  3863. }
  3864. /**
  3865. * Navigates backwards, prioritized in the following order:
  3866. * 1) Previous fragment
  3867. * 2) Previous vertical slide
  3868. * 3) Previous horizontal slide
  3869. */
  3870. function navigatePrev() {
  3871. // Prioritize revealing fragments
  3872. if( previousFragment() === false ) {
  3873. if( availableRoutes().up ) {
  3874. navigateUp();
  3875. }
  3876. else {
  3877. // Fetch the previous horizontal slide, if there is one
  3878. var previousSlide;
  3879. if( config.rtl ) {
  3880. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  3881. }
  3882. else {
  3883. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  3884. }
  3885. if( previousSlide ) {
  3886. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  3887. var h = indexh - 1;
  3888. slide( h, v );
  3889. }
  3890. }
  3891. }
  3892. }
  3893. /**
  3894. * The reverse of #navigatePrev().
  3895. */
  3896. function navigateNext() {
  3897. hasNavigatedRight = true;
  3898. hasNavigatedDown = true;
  3899. // Prioritize revealing fragments
  3900. if( nextFragment() === false ) {
  3901. var routes = availableRoutes();
  3902. // When looping is enabled `routes.down` is always available
  3903. // so we need a separate check for when we've reached the
  3904. // end of a stack and should move horizontally
  3905. if( routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide( currentSlide ) ) {
  3906. routes.down = false;
  3907. }
  3908. if( routes.down ) {
  3909. navigateDown();
  3910. }
  3911. else if( config.rtl ) {
  3912. navigateLeft();
  3913. }
  3914. else {
  3915. navigateRight();
  3916. }
  3917. }
  3918. }
  3919. /**
  3920. * Checks if the target element prevents the triggering of
  3921. * swipe navigation.
  3922. */
  3923. function isSwipePrevented( target ) {
  3924. while( target && typeof target.hasAttribute === 'function' ) {
  3925. if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
  3926. target = target.parentNode;
  3927. }
  3928. return false;
  3929. }
  3930. // --------------------------------------------------------------------//
  3931. // ----------------------------- EVENTS -------------------------------//
  3932. // --------------------------------------------------------------------//
  3933. /**
  3934. * Called by all event handlers that are based on user
  3935. * input.
  3936. *
  3937. * @param {object} [event]
  3938. */
  3939. function onUserInput( event ) {
  3940. if( config.autoSlideStoppable ) {
  3941. pauseAutoSlide();
  3942. }
  3943. }
  3944. /**
  3945. * Called whenever there is mouse input at the document level
  3946. * to determine if the cursor is active or not.
  3947. *
  3948. * @param {object} event
  3949. */
  3950. function onDocumentCursorActive( event ) {
  3951. showCursor();
  3952. clearTimeout( cursorInactiveTimeout );
  3953. cursorInactiveTimeout = setTimeout( hideCursor, config.hideCursorTime );
  3954. }
  3955. /**
  3956. * Handler for the document level 'keypress' event.
  3957. *
  3958. * @param {object} event
  3959. */
  3960. function onDocumentKeyPress( event ) {
  3961. // Check if the pressed key is question mark
  3962. if( event.shiftKey && event.charCode === 63 ) {
  3963. toggleHelp();
  3964. }
  3965. }
  3966. /**
  3967. * Handler for the document level 'keydown' event.
  3968. *
  3969. * @param {object} event
  3970. */
  3971. function onDocumentKeyDown( event ) {
  3972. // If there's a condition specified and it returns false,
  3973. // ignore this event
  3974. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
  3975. return true;
  3976. }
  3977. // Shorthand
  3978. var keyCode = event.keyCode;
  3979. // Remember if auto-sliding was paused so we can toggle it
  3980. var autoSlideWasPaused = autoSlidePaused;
  3981. onUserInput( event );
  3982. // Is there a focused element that could be using the keyboard?
  3983. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  3984. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  3985. var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
  3986. // Whitelist specific modified + keycode combinations
  3987. var prevSlideShortcut = event.shiftKey && event.keyCode === 32;
  3988. var firstSlideShortcut = ( event.metaKey || event.ctrlKey ) && keyCode === 37;
  3989. var lastSlideShortcut = ( event.metaKey || event.ctrlKey ) && keyCode === 39;
  3990. // Prevent all other events when a modifier is pressed
  3991. var unusedModifier = !prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
  3992. ( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );
  3993. // Disregard the event if there's a focused element or a
  3994. // keyboard modifier key is present
  3995. if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;
  3996. // While paused only allow resume keyboard events; 'b', 'v', '.'
  3997. var resumeKeyCodes = [66,86,190,191];
  3998. var key;
  3999. // Custom key bindings for togglePause should be able to resume
  4000. if( typeof config.keyboard === 'object' ) {
  4001. for( key in config.keyboard ) {
  4002. if( config.keyboard[key] === 'togglePause' ) {
  4003. resumeKeyCodes.push( parseInt( key, 10 ) );
  4004. }
  4005. }
  4006. }
  4007. if( isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
  4008. return false;
  4009. }
  4010. var triggered = false;
  4011. // 1. User defined key bindings
  4012. if( typeof config.keyboard === 'object' ) {
  4013. for( key in config.keyboard ) {
  4014. // Check if this binding matches the pressed key
  4015. if( parseInt( key, 10 ) === keyCode ) {
  4016. var value = config.keyboard[ key ];
  4017. // Callback function
  4018. if( typeof value === 'function' ) {
  4019. value.apply( null, [ event ] );
  4020. }
  4021. // String shortcuts to reveal.js API
  4022. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  4023. Reveal[ value ].call();
  4024. }
  4025. triggered = true;
  4026. }
  4027. }
  4028. }
  4029. // 2. Registered custom key bindings
  4030. if( triggered === false ) {
  4031. for( key in registeredKeyBindings ) {
  4032. // Check if this binding matches the pressed key
  4033. if( parseInt( key, 10 ) === keyCode ) {
  4034. var action = registeredKeyBindings[ key ].callback;
  4035. // Callback function
  4036. if( typeof action === 'function' ) {
  4037. action.apply( null, [ event ] );
  4038. }
  4039. // String shortcuts to reveal.js API
  4040. else if( typeof action === 'string' && typeof Reveal[ action ] === 'function' ) {
  4041. Reveal[ action ].call();
  4042. }
  4043. triggered = true;
  4044. }
  4045. }
  4046. }
  4047. // 3. System defined key bindings
  4048. if( triggered === false ) {
  4049. // Assume true and try to prove false
  4050. triggered = true;
  4051. // P, PAGE UP
  4052. if( keyCode === 80 || keyCode === 33 ) {
  4053. navigatePrev();
  4054. }
  4055. // N, PAGE DOWN
  4056. else if( keyCode === 78 || keyCode === 34 ) {
  4057. navigateNext();
  4058. }
  4059. // H, LEFT
  4060. else if( keyCode === 72 || keyCode === 37 ) {
  4061. if( firstSlideShortcut ) {
  4062. slide( 0 );
  4063. }
  4064. else if( !isOverview() && config.navigationMode === 'linear' ) {
  4065. navigatePrev();
  4066. }
  4067. else {
  4068. navigateLeft();
  4069. }
  4070. }
  4071. // L, RIGHT
  4072. else if( keyCode === 76 || keyCode === 39 ) {
  4073. if( lastSlideShortcut ) {
  4074. slide( Number.MAX_VALUE );
  4075. }
  4076. else if( !isOverview() && config.navigationMode === 'linear' ) {
  4077. navigateNext();
  4078. }
  4079. else {
  4080. navigateRight();
  4081. }
  4082. }
  4083. // K, UP
  4084. else if( keyCode === 75 || keyCode === 38 ) {
  4085. if( !isOverview() && config.navigationMode === 'linear' ) {
  4086. navigatePrev();
  4087. }
  4088. else {
  4089. navigateUp();
  4090. }
  4091. }
  4092. // J, DOWN
  4093. else if( keyCode === 74 || keyCode === 40 ) {
  4094. if( !isOverview() && config.navigationMode === 'linear' ) {
  4095. navigateNext();
  4096. }
  4097. else {
  4098. navigateDown();
  4099. }
  4100. }
  4101. // HOME
  4102. else if( keyCode === 36 ) {
  4103. slide( 0 );
  4104. }
  4105. // END
  4106. else if( keyCode === 35 ) {
  4107. slide( Number.MAX_VALUE );
  4108. }
  4109. // SPACE
  4110. else if( keyCode === 32 ) {
  4111. if( isOverview() ) {
  4112. deactivateOverview();
  4113. }
  4114. if( event.shiftKey ) {
  4115. navigatePrev();
  4116. }
  4117. else {
  4118. navigateNext();
  4119. }
  4120. }
  4121. // TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS "BLACK SCREEN" BUTTON
  4122. else if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {
  4123. togglePause();
  4124. }
  4125. // F
  4126. else if( keyCode === 70 ) {
  4127. enterFullscreen();
  4128. }
  4129. // A
  4130. else if( keyCode === 65 ) {
  4131. if ( config.autoSlideStoppable ) {
  4132. toggleAutoSlide( autoSlideWasPaused );
  4133. }
  4134. }
  4135. else {
  4136. triggered = false;
  4137. }
  4138. }
  4139. // If the input resulted in a triggered action we should prevent
  4140. // the browsers default behavior
  4141. if( triggered ) {
  4142. event.preventDefault && event.preventDefault();
  4143. }
  4144. // ESC or O key
  4145. else if ( ( keyCode === 27 || keyCode === 79 ) && features.transforms3d ) {
  4146. if( dom.overlay ) {
  4147. closeOverlay();
  4148. }
  4149. else {
  4150. toggleOverview();
  4151. }
  4152. event.preventDefault && event.preventDefault();
  4153. }
  4154. // If auto-sliding is enabled we need to cue up
  4155. // another timeout
  4156. cueAutoSlide();
  4157. }
  4158. /**
  4159. * Handler for the 'touchstart' event, enables support for
  4160. * swipe and pinch gestures.
  4161. *
  4162. * @param {object} event
  4163. */
  4164. function onTouchStart( event ) {
  4165. if( isSwipePrevented( event.target ) ) return true;
  4166. touch.startX = event.touches[0].clientX;
  4167. touch.startY = event.touches[0].clientY;
  4168. touch.startCount = event.touches.length;
  4169. }
  4170. /**
  4171. * Handler for the 'touchmove' event.
  4172. *
  4173. * @param {object} event
  4174. */
  4175. function onTouchMove( event ) {
  4176. if( isSwipePrevented( event.target ) ) return true;
  4177. // Each touch should only trigger one action
  4178. if( !touch.captured ) {
  4179. onUserInput( event );
  4180. var currentX = event.touches[0].clientX;
  4181. var currentY = event.touches[0].clientY;
  4182. // There was only one touch point, look for a swipe
  4183. if( event.touches.length === 1 && touch.startCount !== 2 ) {
  4184. var deltaX = currentX - touch.startX,
  4185. deltaY = currentY - touch.startY;
  4186. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4187. touch.captured = true;
  4188. navigateLeft();
  4189. }
  4190. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4191. touch.captured = true;
  4192. navigateRight();
  4193. }
  4194. else if( deltaY > touch.threshold ) {
  4195. touch.captured = true;
  4196. navigateUp();
  4197. }
  4198. else if( deltaY < -touch.threshold ) {
  4199. touch.captured = true;
  4200. navigateDown();
  4201. }
  4202. // If we're embedded, only block touch events if they have
  4203. // triggered an action
  4204. if( config.embedded ) {
  4205. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  4206. event.preventDefault();
  4207. }
  4208. }
  4209. // Not embedded? Block them all to avoid needless tossing
  4210. // around of the viewport in iOS
  4211. else {
  4212. event.preventDefault();
  4213. }
  4214. }
  4215. }
  4216. // There's a bug with swiping on some Android devices unless
  4217. // the default action is always prevented
  4218. else if( UA.match( /android/gi ) ) {
  4219. event.preventDefault();
  4220. }
  4221. }
  4222. /**
  4223. * Handler for the 'touchend' event.
  4224. *
  4225. * @param {object} event
  4226. */
  4227. function onTouchEnd( event ) {
  4228. touch.captured = false;
  4229. }
  4230. /**
  4231. * Convert pointer down to touch start.
  4232. *
  4233. * @param {object} event
  4234. */
  4235. function onPointerDown( event ) {
  4236. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4237. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4238. onTouchStart( event );
  4239. }
  4240. }
  4241. /**
  4242. * Convert pointer move to touch move.
  4243. *
  4244. * @param {object} event
  4245. */
  4246. function onPointerMove( event ) {
  4247. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4248. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4249. onTouchMove( event );
  4250. }
  4251. }
  4252. /**
  4253. * Convert pointer up to touch end.
  4254. *
  4255. * @param {object} event
  4256. */
  4257. function onPointerUp( event ) {
  4258. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4259. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4260. onTouchEnd( event );
  4261. }
  4262. }
  4263. /**
  4264. * Handles mouse wheel scrolling, throttled to avoid skipping
  4265. * multiple slides.
  4266. *
  4267. * @param {object} event
  4268. */
  4269. function onDocumentMouseScroll( event ) {
  4270. if( Date.now() - lastMouseWheelStep > 600 ) {
  4271. lastMouseWheelStep = Date.now();
  4272. var delta = event.detail || -event.wheelDelta;
  4273. if( delta > 0 ) {
  4274. navigateNext();
  4275. }
  4276. else if( delta < 0 ) {
  4277. navigatePrev();
  4278. }
  4279. }
  4280. }
  4281. /**
  4282. * Clicking on the progress bar results in a navigation to the
  4283. * closest approximate horizontal slide using this equation:
  4284. *
  4285. * ( clickX / presentationWidth ) * numberOfSlides
  4286. *
  4287. * @param {object} event
  4288. */
  4289. function onProgressClicked( event ) {
  4290. onUserInput( event );
  4291. event.preventDefault();
  4292. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  4293. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  4294. if( config.rtl ) {
  4295. slideIndex = slidesTotal - slideIndex;
  4296. }
  4297. slide( slideIndex );
  4298. }
  4299. /**
  4300. * Event handler for navigation control buttons.
  4301. */
  4302. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigatePrev() : navigateLeft(); }
  4303. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigateNext() : navigateRight(); }
  4304. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  4305. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  4306. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  4307. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  4308. /**
  4309. * Handler for the window level 'hashchange' event.
  4310. *
  4311. * @param {object} [event]
  4312. */
  4313. function onWindowHashChange( event ) {
  4314. readURL();
  4315. }
  4316. /**
  4317. * Handler for the window level 'resize' event.
  4318. *
  4319. * @param {object} [event]
  4320. */
  4321. function onWindowResize( event ) {
  4322. layout();
  4323. }
  4324. /**
  4325. * Handle for the window level 'visibilitychange' event.
  4326. *
  4327. * @param {object} [event]
  4328. */
  4329. function onPageVisibilityChange( event ) {
  4330. var isHidden = document.webkitHidden ||
  4331. document.msHidden ||
  4332. document.hidden;
  4333. // If, after clicking a link or similar and we're coming back,
  4334. // focus the document.body to ensure we can use keyboard shortcuts
  4335. if( isHidden === false && document.activeElement !== document.body ) {
  4336. // Not all elements support .blur() - SVGs among them.
  4337. if( typeof document.activeElement.blur === 'function' ) {
  4338. document.activeElement.blur();
  4339. }
  4340. document.body.focus();
  4341. }
  4342. }
  4343. /**
  4344. * Invoked when a slide is and we're in the overview.
  4345. *
  4346. * @param {object} event
  4347. */
  4348. function onOverviewSlideClicked( event ) {
  4349. // TODO There's a bug here where the event listeners are not
  4350. // removed after deactivating the overview.
  4351. if( eventsAreBound && isOverview() ) {
  4352. event.preventDefault();
  4353. var element = event.target;
  4354. while( element && !element.nodeName.match( /section/gi ) ) {
  4355. element = element.parentNode;
  4356. }
  4357. if( element && !element.classList.contains( 'disabled' ) ) {
  4358. deactivateOverview();
  4359. if( element.nodeName.match( /section/gi ) ) {
  4360. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  4361. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  4362. slide( h, v );
  4363. }
  4364. }
  4365. }
  4366. }
  4367. /**
  4368. * Handles clicks on links that are set to preview in the
  4369. * iframe overlay.
  4370. *
  4371. * @param {object} event
  4372. */
  4373. function onPreviewLinkClicked( event ) {
  4374. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  4375. var url = event.currentTarget.getAttribute( 'href' );
  4376. if( url ) {
  4377. showPreview( url );
  4378. event.preventDefault();
  4379. }
  4380. }
  4381. }
  4382. /**
  4383. * Handles click on the auto-sliding controls element.
  4384. *
  4385. * @param {object} [event]
  4386. */
  4387. function onAutoSlidePlayerClick( event ) {
  4388. // Replay
  4389. if( Reveal.isLastSlide() && config.loop === false ) {
  4390. slide( 0, 0 );
  4391. resumeAutoSlide();
  4392. }
  4393. // Resume
  4394. else if( autoSlidePaused ) {
  4395. resumeAutoSlide();
  4396. }
  4397. // Pause
  4398. else {
  4399. pauseAutoSlide();
  4400. }
  4401. }
  4402. // --------------------------------------------------------------------//
  4403. // ------------------------ PLAYBACK COMPONENT ------------------------//
  4404. // --------------------------------------------------------------------//
  4405. /**
  4406. * Constructor for the playback component, which displays
  4407. * play/pause/progress controls.
  4408. *
  4409. * @param {HTMLElement} container The component will append
  4410. * itself to this
  4411. * @param {function} progressCheck A method which will be
  4412. * called frequently to get the current progress on a range
  4413. * of 0-1
  4414. */
  4415. function Playback( container, progressCheck ) {
  4416. // Cosmetics
  4417. this.diameter = 100;
  4418. this.diameter2 = this.diameter/2;
  4419. this.thickness = 6;
  4420. // Flags if we are currently playing
  4421. this.playing = false;
  4422. // Current progress on a 0-1 range
  4423. this.progress = 0;
  4424. // Used to loop the animation smoothly
  4425. this.progressOffset = 1;
  4426. this.container = container;
  4427. this.progressCheck = progressCheck;
  4428. this.canvas = document.createElement( 'canvas' );
  4429. this.canvas.className = 'playback';
  4430. this.canvas.width = this.diameter;
  4431. this.canvas.height = this.diameter;
  4432. this.canvas.style.width = this.diameter2 + 'px';
  4433. this.canvas.style.height = this.diameter2 + 'px';
  4434. this.context = this.canvas.getContext( '2d' );
  4435. this.container.appendChild( this.canvas );
  4436. this.render();
  4437. }
  4438. /**
  4439. * @param value
  4440. */
  4441. Playback.prototype.setPlaying = function( value ) {
  4442. var wasPlaying = this.playing;
  4443. this.playing = value;
  4444. // Start repainting if we weren't already
  4445. if( !wasPlaying && this.playing ) {
  4446. this.animate();
  4447. }
  4448. else {
  4449. this.render();
  4450. }
  4451. };
  4452. Playback.prototype.animate = function() {
  4453. var progressBefore = this.progress;
  4454. this.progress = this.progressCheck();
  4455. // When we loop, offset the progress so that it eases
  4456. // smoothly rather than immediately resetting
  4457. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  4458. this.progressOffset = this.progress;
  4459. }
  4460. this.render();
  4461. if( this.playing ) {
  4462. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  4463. }
  4464. };
  4465. /**
  4466. * Renders the current progress and playback state.
  4467. */
  4468. Playback.prototype.render = function() {
  4469. var progress = this.playing ? this.progress : 0,
  4470. radius = ( this.diameter2 ) - this.thickness,
  4471. x = this.diameter2,
  4472. y = this.diameter2,
  4473. iconSize = 28;
  4474. // Ease towards 1
  4475. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  4476. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  4477. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  4478. this.context.save();
  4479. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  4480. // Solid background color
  4481. this.context.beginPath();
  4482. this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
  4483. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  4484. this.context.fill();
  4485. // Draw progress track
  4486. this.context.beginPath();
  4487. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  4488. this.context.lineWidth = this.thickness;
  4489. this.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';
  4490. this.context.stroke();
  4491. if( this.playing ) {
  4492. // Draw progress on top of track
  4493. this.context.beginPath();
  4494. this.context.arc( x, y, radius, startAngle, endAngle, false );
  4495. this.context.lineWidth = this.thickness;
  4496. this.context.strokeStyle = '#fff';
  4497. this.context.stroke();
  4498. }
  4499. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  4500. // Draw play/pause icons
  4501. if( this.playing ) {
  4502. this.context.fillStyle = '#fff';
  4503. this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
  4504. this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
  4505. }
  4506. else {
  4507. this.context.beginPath();
  4508. this.context.translate( 4, 0 );
  4509. this.context.moveTo( 0, 0 );
  4510. this.context.lineTo( iconSize - 4, iconSize / 2 );
  4511. this.context.lineTo( 0, iconSize );
  4512. this.context.fillStyle = '#fff';
  4513. this.context.fill();
  4514. }
  4515. this.context.restore();
  4516. };
  4517. Playback.prototype.on = function( type, listener ) {
  4518. this.canvas.addEventListener( type, listener, false );
  4519. };
  4520. Playback.prototype.off = function( type, listener ) {
  4521. this.canvas.removeEventListener( type, listener, false );
  4522. };
  4523. Playback.prototype.destroy = function() {
  4524. this.playing = false;
  4525. if( this.canvas.parentNode ) {
  4526. this.container.removeChild( this.canvas );
  4527. }
  4528. };
  4529. // --------------------------------------------------------------------//
  4530. // ------------------------------- API --------------------------------//
  4531. // --------------------------------------------------------------------//
  4532. Reveal = {
  4533. VERSION: VERSION,
  4534. initialize: initialize,
  4535. configure: configure,
  4536. sync: sync,
  4537. syncSlide: syncSlide,
  4538. syncFragments: syncFragments,
  4539. // Navigation methods
  4540. slide: slide,
  4541. left: navigateLeft,
  4542. right: navigateRight,
  4543. up: navigateUp,
  4544. down: navigateDown,
  4545. prev: navigatePrev,
  4546. next: navigateNext,
  4547. // Fragment methods
  4548. navigateFragment: navigateFragment,
  4549. prevFragment: previousFragment,
  4550. nextFragment: nextFragment,
  4551. // Deprecated aliases
  4552. navigateTo: slide,
  4553. navigateLeft: navigateLeft,
  4554. navigateRight: navigateRight,
  4555. navigateUp: navigateUp,
  4556. navigateDown: navigateDown,
  4557. navigatePrev: navigatePrev,
  4558. navigateNext: navigateNext,
  4559. // Forces an update in slide layout
  4560. layout: layout,
  4561. // Randomizes the order of slides
  4562. shuffle: shuffle,
  4563. // Returns an object with the available routes as booleans (left/right/top/bottom)
  4564. availableRoutes: availableRoutes,
  4565. // Returns an object with the available fragments as booleans (prev/next)
  4566. availableFragments: availableFragments,
  4567. // Toggles a help overlay with keyboard shortcuts
  4568. toggleHelp: toggleHelp,
  4569. // Toggles the overview mode on/off
  4570. toggleOverview: toggleOverview,
  4571. // Toggles the "black screen" mode on/off
  4572. togglePause: togglePause,
  4573. // Toggles the auto slide mode on/off
  4574. toggleAutoSlide: toggleAutoSlide,
  4575. // State checks
  4576. isOverview: isOverview,
  4577. isPaused: isPaused,
  4578. isAutoSliding: isAutoSliding,
  4579. isSpeakerNotes: isSpeakerNotes,
  4580. // Slide preloading
  4581. loadSlide: loadSlide,
  4582. unloadSlide: unloadSlide,
  4583. // Adds or removes all internal event listeners (such as keyboard)
  4584. addEventListeners: addEventListeners,
  4585. removeEventListeners: removeEventListeners,
  4586. // Facility for persisting and restoring the presentation state
  4587. getState: getState,
  4588. setState: setState,
  4589. // Presentation progress
  4590. getSlidePastCount: getSlidePastCount,
  4591. // Presentation progress on range of 0-1
  4592. getProgress: getProgress,
  4593. // Returns the indices of the current, or specified, slide
  4594. getIndices: getIndices,
  4595. // Returns an Array of all slides
  4596. getSlides: getSlides,
  4597. // Returns an Array of objects representing the attributes on
  4598. // the slides
  4599. getSlidesAttributes: getSlidesAttributes,
  4600. // Returns the total number of slides
  4601. getTotalSlides: getTotalSlides,
  4602. // Returns the slide element at the specified index
  4603. getSlide: getSlide,
  4604. // Returns the slide background element at the specified index
  4605. getSlideBackground: getSlideBackground,
  4606. // Returns the speaker notes string for a slide, or null
  4607. getSlideNotes: getSlideNotes,
  4608. // Returns the previous slide element, may be null
  4609. getPreviousSlide: function() {
  4610. return previousSlide;
  4611. },
  4612. // Returns the current slide element
  4613. getCurrentSlide: function() {
  4614. return currentSlide;
  4615. },
  4616. // Returns the current scale of the presentation content
  4617. getScale: function() {
  4618. return scale;
  4619. },
  4620. // Returns the current configuration object
  4621. getConfig: function() {
  4622. return config;
  4623. },
  4624. // Helper method, retrieves query string as a key/value hash
  4625. getQueryHash: function() {
  4626. var query = {};
  4627. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  4628. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  4629. } );
  4630. // Basic deserialization
  4631. for( var i in query ) {
  4632. var value = query[ i ];
  4633. query[ i ] = deserialize( unescape( value ) );
  4634. }
  4635. return query;
  4636. },
  4637. // Returns the top-level DOM element
  4638. getRevealElement: function() {
  4639. return dom.wrapper || document.querySelector( '.reveal' );
  4640. },
  4641. // Returns a hash with all registered plugins
  4642. getPlugins: function() {
  4643. return plugins;
  4644. },
  4645. // Returns true if we're currently on the first slide
  4646. isFirstSlide: function() {
  4647. return ( indexh === 0 && indexv === 0 );
  4648. },
  4649. // Returns true if we're currently on the last slide
  4650. isLastSlide: function() {
  4651. if( currentSlide ) {
  4652. // Does this slide have a next sibling?
  4653. if( currentSlide.nextElementSibling ) return false;
  4654. // If it's vertical, does its parent have a next sibling?
  4655. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  4656. return true;
  4657. }
  4658. return false;
  4659. },
  4660. // Returns true if we're on the last slide in the current
  4661. // vertical stack
  4662. isLastVerticalSlide: function() {
  4663. if( currentSlide && isVerticalSlide( currentSlide ) ) {
  4664. // Does this slide have a next sibling?
  4665. if( currentSlide.nextElementSibling ) return false;
  4666. return true;
  4667. }
  4668. return false;
  4669. },
  4670. // Checks if reveal.js has been loaded and is ready for use
  4671. isReady: function() {
  4672. return loaded;
  4673. },
  4674. // Forward event binding to the reveal DOM element
  4675. addEventListener: function( type, listener, useCapture ) {
  4676. if( 'addEventListener' in window ) {
  4677. Reveal.getRevealElement().addEventListener( type, listener, useCapture );
  4678. }
  4679. },
  4680. removeEventListener: function( type, listener, useCapture ) {
  4681. if( 'addEventListener' in window ) {
  4682. Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
  4683. }
  4684. },
  4685. // Adds/remvoes a custom key binding
  4686. addKeyBinding: addKeyBinding,
  4687. removeKeyBinding: removeKeyBinding,
  4688. // API for registering and retrieving plugins
  4689. registerPlugin: registerPlugin,
  4690. hasPlugin: hasPlugin,
  4691. getPlugin: getPlugin,
  4692. // Programatically triggers a keyboard event
  4693. triggerKey: function( keyCode ) {
  4694. onDocumentKeyDown( { keyCode: keyCode } );
  4695. },
  4696. // Registers a new shortcut to include in the help overlay
  4697. registerKeyboardShortcut: function( key, value ) {
  4698. keyboardShortcuts[key] = value;
  4699. }
  4700. };
  4701. return Reveal;
  4702. }));