reveal.js 161 KB

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  1. /*!
  2. * reveal.js
  3. * http://revealjs.com
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2019 Hakim El Hattab, http://hakim.se
  7. */
  8. (function( root, factory ) {
  9. if( typeof define === 'function' && define.amd ) {
  10. // AMD. Register as an anonymous module.
  11. define( function() {
  12. root.Reveal = factory();
  13. return root.Reveal;
  14. } );
  15. } else if( typeof exports === 'object' ) {
  16. // Node. Does not work with strict CommonJS.
  17. module.exports = factory();
  18. } else {
  19. // Browser globals.
  20. root.Reveal = factory();
  21. }
  22. }( this, function() {
  23. 'use strict';
  24. var Reveal;
  25. // The reveal.js version
  26. var VERSION = '3.7.0';
  27. var SLIDES_SELECTOR = '.slides section',
  28. HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
  29. VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
  30. HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
  31. UA = navigator.userAgent,
  32. // Configuration defaults, can be overridden at initialization time
  33. config = {
  34. // The "normal" size of the presentation, aspect ratio will be preserved
  35. // when the presentation is scaled to fit different resolutions
  36. width: 960,
  37. height: 700,
  38. // Factor of the display size that should remain empty around the content
  39. margin: 0.04,
  40. // Bounds for smallest/largest possible scale to apply to content
  41. minScale: 0.2,
  42. maxScale: 2.0,
  43. // Display presentation control arrows
  44. controls: true,
  45. // Help the user learn the controls by providing hints, for example by
  46. // bouncing the down arrow when they first encounter a vertical slide
  47. controlsTutorial: true,
  48. // Determines where controls appear, "edges" or "bottom-right"
  49. controlsLayout: 'bottom-right',
  50. // Visibility rule for backwards navigation arrows; "faded", "hidden"
  51. // or "visible"
  52. controlsBackArrows: 'faded',
  53. // Display a presentation progress bar
  54. progress: true,
  55. // Display the page number of the current slide
  56. // - true: Show slide number
  57. // - false: Hide slide number
  58. //
  59. // Can optionally be set as a string that specifies the number formatting:
  60. // - "h.v": Horizontal . vertical slide number (default)
  61. // - "h/v": Horizontal / vertical slide number
  62. // - "c": Flattened slide number
  63. // - "c/t": Flattened slide number / total slides
  64. //
  65. // Alternatively, you can provide a function that returns the slide
  66. // number for the current slide. The function needs to return an array
  67. // with one string [slideNumber] or three strings [n1,delimiter,n2].
  68. // See #formatSlideNumber().
  69. slideNumber: false,
  70. // Can be used to limit the contexts in which the slide number appears
  71. // - "all": Always show the slide number
  72. // - "print": Only when printing to PDF
  73. // - "speaker": Only in the speaker view
  74. showSlideNumber: 'all',
  75. // Use 1 based indexing for # links to match slide number (default is zero
  76. // based)
  77. hashOneBasedIndex: false,
  78. // Add the current slide number to the URL hash so that reloading the
  79. // page/copying the URL will return you to the same slide
  80. hash: false,
  81. // Push each slide change to the browser history. Implies `hash: true`
  82. history: false,
  83. // Enable keyboard shortcuts for navigation
  84. keyboard: true,
  85. // Optional function that blocks keyboard events when retuning false
  86. keyboardCondition: null,
  87. // Enable the slide overview mode
  88. overview: true,
  89. // Disables the default reveal.js slide layout so that you can use
  90. // custom CSS layout
  91. disableLayout: false,
  92. // Vertical centering of slides
  93. center: true,
  94. // Enables touch navigation on devices with touch input
  95. touch: true,
  96. // Loop the presentation
  97. loop: false,
  98. // Change the presentation direction to be RTL
  99. rtl: false,
  100. // Changes the behavior of our navigation directions.
  101. //
  102. // "default"
  103. // Left/right arrow keys step between horizontal slides, up/down
  104. // arrow keys step between vertical slides. Space key steps through
  105. // all slides (both horizontal and vertical).
  106. //
  107. // "linear"
  108. // Removes the up/down arrows. Left/right arrows step through all
  109. // slides (both horizontal and vertical).
  110. //
  111. // "grid"
  112. // When this is enabled, stepping left/right from a vertical stack
  113. // to an adjacent vertical stack will land you at the same vertical
  114. // index.
  115. //
  116. // Consider a deck with six slides ordered in two vertical stacks:
  117. // 1.1 2.1
  118. // 1.2 2.2
  119. // 1.3 2.3
  120. //
  121. // If you're on slide 1.3 and navigate right, you will normally move
  122. // from 1.3 -> 2.1. With "gridNavigation" enabled the same navigation
  123. // takes you from 1.3 -> 2.3.
  124. navigationMode: 'default',
  125. // Randomizes the order of slides each time the presentation loads
  126. shuffle: false,
  127. // Turns fragments on and off globally
  128. fragments: true,
  129. // Flags whether to include the current fragment in the URL,
  130. // so that reloading brings you to the same fragment position
  131. fragmentInURL: false,
  132. // Flags if the presentation is running in an embedded mode,
  133. // i.e. contained within a limited portion of the screen
  134. embedded: false,
  135. // Flags if we should show a help overlay when the question-mark
  136. // key is pressed
  137. help: true,
  138. // Flags if it should be possible to pause the presentation (blackout)
  139. pause: true,
  140. // Flags if speaker notes should be visible to all viewers
  141. showNotes: false,
  142. // Global override for autolaying embedded media (video/audio/iframe)
  143. // - null: Media will only autoplay if data-autoplay is present
  144. // - true: All media will autoplay, regardless of individual setting
  145. // - false: No media will autoplay, regardless of individual setting
  146. autoPlayMedia: null,
  147. // Controls automatic progression to the next slide
  148. // - 0: Auto-sliding only happens if the data-autoslide HTML attribute
  149. // is present on the current slide or fragment
  150. // - 1+: All slides will progress automatically at the given interval
  151. // - false: No auto-sliding, even if data-autoslide is present
  152. autoSlide: 0,
  153. // Stop auto-sliding after user input
  154. autoSlideStoppable: true,
  155. // Use this method for navigation when auto-sliding (defaults to navigateNext)
  156. autoSlideMethod: null,
  157. // Specify the average time in seconds that you think you will spend
  158. // presenting each slide. This is used to show a pacing timer in the
  159. // speaker view
  160. defaultTiming: null,
  161. // Enable slide navigation via mouse wheel
  162. mouseWheel: false,
  163. // Apply a 3D roll to links on hover
  164. rollingLinks: false,
  165. // Hides the address bar on mobile devices
  166. hideAddressBar: true,
  167. // Opens links in an iframe preview overlay
  168. // Add `data-preview-link` and `data-preview-link="false"` to customise each link
  169. // individually
  170. previewLinks: false,
  171. // Exposes the reveal.js API through window.postMessage
  172. postMessage: true,
  173. // Dispatches all reveal.js events to the parent window through postMessage
  174. postMessageEvents: false,
  175. // Focuses body when page changes visibility to ensure keyboard shortcuts work
  176. focusBodyOnPageVisibilityChange: true,
  177. // Transition style
  178. transition: 'slide', // none/fade/slide/convex/concave/zoom
  179. // Transition speed
  180. transitionSpeed: 'default', // default/fast/slow
  181. // Transition style for full page slide backgrounds
  182. backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
  183. // Parallax background image
  184. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  185. // Parallax background size
  186. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  187. // Parallax background repeat
  188. parallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit
  189. // Parallax background position
  190. parallaxBackgroundPosition: '', // CSS syntax, e.g. "top left"
  191. // Amount of pixels to move the parallax background per slide step
  192. parallaxBackgroundHorizontal: null,
  193. parallaxBackgroundVertical: null,
  194. // The maximum number of pages a single slide can expand onto when printing
  195. // to PDF, unlimited by default
  196. pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,
  197. // Prints each fragment on a separate slide
  198. pdfSeparateFragments: true,
  199. // Offset used to reduce the height of content within exported PDF pages.
  200. // This exists to account for environment differences based on how you
  201. // print to PDF. CLI printing options, like phantomjs and wkpdf, can end
  202. // on precisely the total height of the document whereas in-browser
  203. // printing has to end one pixel before.
  204. pdfPageHeightOffset: -1,
  205. // Number of slides away from the current that are visible
  206. viewDistance: 3,
  207. // The display mode that will be used to show slides
  208. display: 'block',
  209. // Hide cursor if inactive
  210. hideInactiveCursor: true,
  211. // Time before the cursor is hidden (in ms)
  212. hideCursorTime: 5000,
  213. // Script dependencies to load
  214. dependencies: []
  215. },
  216. // Flags if Reveal.initialize() has been called
  217. initialized = false,
  218. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  219. loaded = false,
  220. // Flags if the overview mode is currently active
  221. overview = false,
  222. // Holds the dimensions of our overview slides, including margins
  223. overviewSlideWidth = null,
  224. overviewSlideHeight = null,
  225. // The horizontal and vertical index of the currently active slide
  226. indexh,
  227. indexv,
  228. // The previous and current slide HTML elements
  229. previousSlide,
  230. currentSlide,
  231. previousBackground,
  232. // Remember which directions that the user has navigated towards
  233. hasNavigatedRight = false,
  234. hasNavigatedDown = false,
  235. // Slides may hold a data-state attribute which we pick up and apply
  236. // as a class to the body. This list contains the combined state of
  237. // all current slides.
  238. state = [],
  239. // The current scale of the presentation (see width/height config)
  240. scale = 1,
  241. // CSS transform that is currently applied to the slides container,
  242. // split into two groups
  243. slidesTransform = { layout: '', overview: '' },
  244. // Cached references to DOM elements
  245. dom = {},
  246. // Features supported by the browser, see #checkCapabilities()
  247. features = {},
  248. // Client is a mobile device, see #checkCapabilities()
  249. isMobileDevice,
  250. // Client is a desktop Chrome, see #checkCapabilities()
  251. isChrome,
  252. // Throttles mouse wheel navigation
  253. lastMouseWheelStep = 0,
  254. // Delays updates to the URL due to a Chrome thumbnailer bug
  255. writeURLTimeout = 0,
  256. // Is the mouse pointer currently hidden from view
  257. cursorHidden = false,
  258. // Timeout used to determine when the cursor is inactive
  259. cursorInactiveTimeout = 0,
  260. // Flags if the interaction event listeners are bound
  261. eventsAreBound = false,
  262. // The current auto-slide duration
  263. autoSlide = 0,
  264. // Auto slide properties
  265. autoSlidePlayer,
  266. autoSlideTimeout = 0,
  267. autoSlideStartTime = -1,
  268. autoSlidePaused = false,
  269. // Holds information about the currently ongoing touch input
  270. touch = {
  271. startX: 0,
  272. startY: 0,
  273. startCount: 0,
  274. captured: false,
  275. threshold: 40
  276. },
  277. // Holds information about the keyboard shortcuts
  278. keyboardShortcuts = {
  279. 'N , SPACE': 'Next slide',
  280. 'P': 'Previous slide',
  281. '← , H': 'Navigate left',
  282. '→ , L': 'Navigate right',
  283. '↑ , K': 'Navigate up',
  284. '↓ , J': 'Navigate down',
  285. 'Home , ⌘/CTRL ←': 'First slide',
  286. 'End , ⌘/CTRL →': 'Last slide',
  287. 'B , .': 'Pause',
  288. 'F': 'Fullscreen',
  289. 'ESC, O': 'Slide overview'
  290. },
  291. // Holds custom key code mappings
  292. registeredKeyBindings = {};
  293. /**
  294. * Starts up the presentation if the client is capable.
  295. */
  296. function initialize( options ) {
  297. // Make sure we only initialize once
  298. if( initialized === true ) return;
  299. initialized = true;
  300. checkCapabilities();
  301. if( !features.transforms2d && !features.transforms3d ) {
  302. document.body.setAttribute( 'class', 'no-transforms' );
  303. // Since JS won't be running any further, we load all lazy
  304. // loading elements upfront
  305. var images = toArray( document.getElementsByTagName( 'img' ) ),
  306. iframes = toArray( document.getElementsByTagName( 'iframe' ) );
  307. var lazyLoadable = images.concat( iframes );
  308. for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
  309. var element = lazyLoadable[i];
  310. if( element.getAttribute( 'data-src' ) ) {
  311. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  312. element.removeAttribute( 'data-src' );
  313. }
  314. }
  315. // If the browser doesn't support core features we won't be
  316. // using JavaScript to control the presentation
  317. return;
  318. }
  319. // Cache references to key DOM elements
  320. dom.wrapper = document.querySelector( '.reveal' );
  321. dom.slides = document.querySelector( '.reveal .slides' );
  322. // Force a layout when the whole page, incl fonts, has loaded
  323. window.addEventListener( 'load', layout, false );
  324. var query = Reveal.getQueryHash();
  325. // Do not accept new dependencies via query config to avoid
  326. // the potential of malicious script injection
  327. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  328. // Copy options over to our config object
  329. extend( config, options );
  330. extend( config, query );
  331. // Hide the address bar in mobile browsers
  332. hideAddressBar();
  333. // Loads the dependencies and continues to #start() once done
  334. load();
  335. }
  336. /**
  337. * Inspect the client to see what it's capable of, this
  338. * should only happens once per runtime.
  339. */
  340. function checkCapabilities() {
  341. isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA );
  342. isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
  343. var testElement = document.createElement( 'div' );
  344. features.transforms3d = 'WebkitPerspective' in testElement.style ||
  345. 'MozPerspective' in testElement.style ||
  346. 'msPerspective' in testElement.style ||
  347. 'OPerspective' in testElement.style ||
  348. 'perspective' in testElement.style;
  349. features.transforms2d = 'WebkitTransform' in testElement.style ||
  350. 'MozTransform' in testElement.style ||
  351. 'msTransform' in testElement.style ||
  352. 'OTransform' in testElement.style ||
  353. 'transform' in testElement.style;
  354. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  355. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  356. features.canvas = !!document.createElement( 'canvas' ).getContext;
  357. // Transitions in the overview are disabled in desktop and
  358. // Safari due to lag
  359. features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );
  360. // Flags if we should use zoom instead of transform to scale
  361. // up slides. Zoom produces crisper results but has a lot of
  362. // xbrowser quirks so we only use it in whitelsited browsers.
  363. features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
  364. ( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
  365. }
  366. /**
  367. * Loads the dependencies of reveal.js. Dependencies are
  368. * defined via the configuration option 'dependencies'
  369. * and will be loaded prior to starting/binding reveal.js.
  370. * Some dependencies may have an 'async' flag, if so they
  371. * will load after reveal.js has been started up.
  372. */
  373. function load() {
  374. var scripts = [],
  375. scriptsAsync = [],
  376. scriptsToPreload = 0;
  377. // Called once synchronous scripts finish loading
  378. function afterSynchronousScriptsLoaded() {
  379. // Load asynchronous scripts
  380. if( scriptsAsync.length ) {
  381. scriptsAsync.forEach( function( s ) {
  382. loadScript( s.src, s.callback );
  383. } );
  384. }
  385. start();
  386. }
  387. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  388. var s = config.dependencies[i];
  389. // Load if there's no condition or the condition is truthy
  390. if( !s.condition || s.condition() ) {
  391. if( s.async ) {
  392. scriptsAsync.push( s );
  393. }
  394. else {
  395. scripts.push( s );
  396. }
  397. }
  398. }
  399. if( scripts.length ) {
  400. scriptsToPreload = scripts.length;
  401. // Load synchronous scripts
  402. scripts.forEach( function( s ) {
  403. loadScript( s.src, function() {
  404. if( typeof s.callback === 'function' ) s.callback();
  405. if( --scriptsToPreload === 0 ) {
  406. afterSynchronousScriptsLoaded();
  407. }
  408. } );
  409. } );
  410. }
  411. else {
  412. afterSynchronousScriptsLoaded();
  413. }
  414. }
  415. /**
  416. * Loads a JavaScript file from the given URL and executes it.
  417. *
  418. * @param {string} url Address of the .js file to load
  419. * @param {function} callback Method to invoke when the script
  420. * has loaded and executed
  421. */
  422. function loadScript( url, callback ) {
  423. var script = document.createElement( 'script' );
  424. script.type = 'text/javascript';
  425. script.async = false;
  426. script.defer = false;
  427. script.src = url;
  428. if( callback ) {
  429. // Success callback
  430. script.onload = script.onreadystatechange = function( event ) {
  431. if( event.type === "load" || (/loaded|complete/.test( script.readyState ) ) ) {
  432. // Kill event listeners
  433. script.onload = script.onreadystatechange = script.onerror = null;
  434. callback();
  435. }
  436. };
  437. // Error callback
  438. script.onerror = function( err ) {
  439. // Kill event listeners
  440. script.onload = script.onreadystatechange = script.onerror = null;
  441. callback( new Error( 'Failed loading script: ' + script.src + '\n' + err) );
  442. };
  443. }
  444. // Append the script at the end of <head>
  445. var head = document.querySelector( 'head' );
  446. head.insertBefore( script, head.lastChild );
  447. }
  448. /**
  449. * Starts up reveal.js by binding input events and navigating
  450. * to the current URL deeplink if there is one.
  451. */
  452. function start() {
  453. loaded = true;
  454. // Make sure we've got all the DOM elements we need
  455. setupDOM();
  456. // Listen to messages posted to this window
  457. setupPostMessage();
  458. // Prevent the slides from being scrolled out of view
  459. setupScrollPrevention();
  460. // Resets all vertical slides so that only the first is visible
  461. resetVerticalSlides();
  462. // Updates the presentation to match the current configuration values
  463. configure();
  464. // Read the initial hash
  465. readURL();
  466. // Update all backgrounds
  467. updateBackground( true );
  468. // Notify listeners that the presentation is ready but use a 1ms
  469. // timeout to ensure it's not fired synchronously after #initialize()
  470. setTimeout( function() {
  471. // Enable transitions now that we're loaded
  472. dom.slides.classList.remove( 'no-transition' );
  473. dom.wrapper.classList.add( 'ready' );
  474. dispatchEvent( 'ready', {
  475. 'indexh': indexh,
  476. 'indexv': indexv,
  477. 'currentSlide': currentSlide
  478. } );
  479. }, 1 );
  480. // Special setup and config is required when printing to PDF
  481. if( isPrintingPDF() ) {
  482. removeEventListeners();
  483. // The document needs to have loaded for the PDF layout
  484. // measurements to be accurate
  485. if( document.readyState === 'complete' ) {
  486. setupPDF();
  487. }
  488. else {
  489. window.addEventListener( 'load', setupPDF );
  490. }
  491. }
  492. }
  493. /**
  494. * Finds and stores references to DOM elements which are
  495. * required by the presentation. If a required element is
  496. * not found, it is created.
  497. */
  498. function setupDOM() {
  499. // Prevent transitions while we're loading
  500. dom.slides.classList.add( 'no-transition' );
  501. if( isMobileDevice ) {
  502. dom.wrapper.classList.add( 'no-hover' );
  503. }
  504. else {
  505. dom.wrapper.classList.remove( 'no-hover' );
  506. }
  507. if( /iphone/gi.test( UA ) ) {
  508. dom.wrapper.classList.add( 'ua-iphone' );
  509. }
  510. else {
  511. dom.wrapper.classList.remove( 'ua-iphone' );
  512. }
  513. // Background element
  514. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  515. // Progress bar
  516. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  517. dom.progressbar = dom.progress.querySelector( 'span' );
  518. // Arrow controls
  519. dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls',
  520. '<button class="navigate-left" aria-label="previous slide"><div class="controls-arrow"></div></button>' +
  521. '<button class="navigate-right" aria-label="next slide"><div class="controls-arrow"></div></button>' +
  522. '<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>' +
  523. '<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></button>' );
  524. // Slide number
  525. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  526. // Element containing notes that are visible to the audience
  527. dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
  528. dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
  529. dom.speakerNotes.setAttribute( 'tabindex', '0' );
  530. // Overlay graphic which is displayed during the paused mode
  531. dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class="resume-button">Resume presentation</button>' : null );
  532. dom.wrapper.setAttribute( 'role', 'application' );
  533. // There can be multiple instances of controls throughout the page
  534. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  535. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  536. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  537. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  538. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  539. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  540. // The right and down arrows in the standard reveal.js controls
  541. dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' );
  542. dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' );
  543. dom.statusDiv = createStatusDiv();
  544. }
  545. /**
  546. * Creates a hidden div with role aria-live to announce the
  547. * current slide content. Hide the div off-screen to make it
  548. * available only to Assistive Technologies.
  549. *
  550. * @return {HTMLElement}
  551. */
  552. function createStatusDiv() {
  553. var statusDiv = document.getElementById( 'aria-status-div' );
  554. if( !statusDiv ) {
  555. statusDiv = document.createElement( 'div' );
  556. statusDiv.style.position = 'absolute';
  557. statusDiv.style.height = '1px';
  558. statusDiv.style.width = '1px';
  559. statusDiv.style.overflow = 'hidden';
  560. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  561. statusDiv.setAttribute( 'id', 'aria-status-div' );
  562. statusDiv.setAttribute( 'aria-live', 'polite' );
  563. statusDiv.setAttribute( 'aria-atomic','true' );
  564. dom.wrapper.appendChild( statusDiv );
  565. }
  566. return statusDiv;
  567. }
  568. /**
  569. * Converts the given HTML element into a string of text
  570. * that can be announced to a screen reader. Hidden
  571. * elements are excluded.
  572. */
  573. function getStatusText( node ) {
  574. var text = '';
  575. // Text node
  576. if( node.nodeType === 3 ) {
  577. text += node.textContent;
  578. }
  579. // Element node
  580. else if( node.nodeType === 1 ) {
  581. var isAriaHidden = node.getAttribute( 'aria-hidden' );
  582. var isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
  583. if( isAriaHidden !== 'true' && !isDisplayHidden ) {
  584. toArray( node.childNodes ).forEach( function( child ) {
  585. text += getStatusText( child );
  586. } );
  587. }
  588. }
  589. return text;
  590. }
  591. /**
  592. * Configures the presentation for printing to a static
  593. * PDF.
  594. */
  595. function setupPDF() {
  596. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  597. // Dimensions of the PDF pages
  598. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  599. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  600. // Dimensions of slides within the pages
  601. var slideWidth = slideSize.width,
  602. slideHeight = slideSize.height;
  603. // Let the browser know what page size we want to print
  604. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
  605. // Limit the size of certain elements to the dimensions of the slide
  606. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  607. document.body.classList.add( 'print-pdf' );
  608. document.body.style.width = pageWidth + 'px';
  609. document.body.style.height = pageHeight + 'px';
  610. // Make sure stretch elements fit on slide
  611. layoutSlideContents( slideWidth, slideHeight );
  612. // Add each slide's index as attributes on itself, we need these
  613. // indices to generate slide numbers below
  614. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  615. hslide.setAttribute( 'data-index-h', h );
  616. if( hslide.classList.contains( 'stack' ) ) {
  617. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  618. vslide.setAttribute( 'data-index-h', h );
  619. vslide.setAttribute( 'data-index-v', v );
  620. } );
  621. }
  622. } );
  623. // Slide and slide background layout
  624. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  625. // Vertical stacks are not centred since their section
  626. // children will be
  627. if( slide.classList.contains( 'stack' ) === false ) {
  628. // Center the slide inside of the page, giving the slide some margin
  629. var left = ( pageWidth - slideWidth ) / 2,
  630. top = ( pageHeight - slideHeight ) / 2;
  631. var contentHeight = slide.scrollHeight;
  632. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  633. // Adhere to configured pages per slide limit
  634. numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
  635. // Center slides vertically
  636. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  637. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  638. }
  639. // Wrap the slide in a page element and hide its overflow
  640. // so that no page ever flows onto another
  641. var page = document.createElement( 'div' );
  642. page.className = 'pdf-page';
  643. page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
  644. slide.parentNode.insertBefore( page, slide );
  645. page.appendChild( slide );
  646. // Position the slide inside of the page
  647. slide.style.left = left + 'px';
  648. slide.style.top = top + 'px';
  649. slide.style.width = slideWidth + 'px';
  650. if( slide.slideBackgroundElement ) {
  651. page.insertBefore( slide.slideBackgroundElement, slide );
  652. }
  653. // Inject notes if `showNotes` is enabled
  654. if( config.showNotes ) {
  655. // Are there notes for this slide?
  656. var notes = getSlideNotes( slide );
  657. if( notes ) {
  658. var notesSpacing = 8;
  659. var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
  660. var notesElement = document.createElement( 'div' );
  661. notesElement.classList.add( 'speaker-notes' );
  662. notesElement.classList.add( 'speaker-notes-pdf' );
  663. notesElement.setAttribute( 'data-layout', notesLayout );
  664. notesElement.innerHTML = notes;
  665. if( notesLayout === 'separate-page' ) {
  666. page.parentNode.insertBefore( notesElement, page.nextSibling );
  667. }
  668. else {
  669. notesElement.style.left = notesSpacing + 'px';
  670. notesElement.style.bottom = notesSpacing + 'px';
  671. notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
  672. page.appendChild( notesElement );
  673. }
  674. }
  675. }
  676. // Inject slide numbers if `slideNumbers` are enabled
  677. if( config.slideNumber && /all|print/i.test( config.showSlideNumber ) ) {
  678. var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1,
  679. slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1;
  680. var numberElement = document.createElement( 'div' );
  681. numberElement.classList.add( 'slide-number' );
  682. numberElement.classList.add( 'slide-number-pdf' );
  683. numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV );
  684. page.appendChild( numberElement );
  685. }
  686. // Copy page and show fragments one after another
  687. if( config.pdfSeparateFragments ) {
  688. // Each fragment 'group' is an array containing one or more
  689. // fragments. Multiple fragments that appear at the same time
  690. // are part of the same group.
  691. var fragmentGroups = sortFragments( page.querySelectorAll( '.fragment' ), true );
  692. var previousFragmentStep;
  693. var previousPage;
  694. fragmentGroups.forEach( function( fragments ) {
  695. // Remove 'current-fragment' from the previous group
  696. if( previousFragmentStep ) {
  697. previousFragmentStep.forEach( function( fragment ) {
  698. fragment.classList.remove( 'current-fragment' );
  699. } );
  700. }
  701. // Show the fragments for the current index
  702. fragments.forEach( function( fragment ) {
  703. fragment.classList.add( 'visible', 'current-fragment' );
  704. } );
  705. // Create a separate page for the current fragment state
  706. var clonedPage = page.cloneNode( true );
  707. page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
  708. previousFragmentStep = fragments;
  709. previousPage = clonedPage;
  710. } );
  711. // Reset the first/original page so that all fragments are hidden
  712. fragmentGroups.forEach( function( fragments ) {
  713. fragments.forEach( function( fragment ) {
  714. fragment.classList.remove( 'visible', 'current-fragment' );
  715. } );
  716. } );
  717. }
  718. // Show all fragments
  719. else {
  720. toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) {
  721. fragment.classList.add( 'visible' );
  722. } );
  723. }
  724. }
  725. } );
  726. // Notify subscribers that the PDF layout is good to go
  727. dispatchEvent( 'pdf-ready' );
  728. }
  729. /**
  730. * This is an unfortunate necessity. Some actions – such as
  731. * an input field being focused in an iframe or using the
  732. * keyboard to expand text selection beyond the bounds of
  733. * a slide – can trigger our content to be pushed out of view.
  734. * This scrolling can not be prevented by hiding overflow in
  735. * CSS (we already do) so we have to resort to repeatedly
  736. * checking if the slides have been offset :(
  737. */
  738. function setupScrollPrevention() {
  739. setInterval( function() {
  740. if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
  741. dom.wrapper.scrollTop = 0;
  742. dom.wrapper.scrollLeft = 0;
  743. }
  744. }, 1000 );
  745. }
  746. /**
  747. * Creates an HTML element and returns a reference to it.
  748. * If the element already exists the existing instance will
  749. * be returned.
  750. *
  751. * @param {HTMLElement} container
  752. * @param {string} tagname
  753. * @param {string} classname
  754. * @param {string} innerHTML
  755. *
  756. * @return {HTMLElement}
  757. */
  758. function createSingletonNode( container, tagname, classname, innerHTML ) {
  759. // Find all nodes matching the description
  760. var nodes = container.querySelectorAll( '.' + classname );
  761. // Check all matches to find one which is a direct child of
  762. // the specified container
  763. for( var i = 0; i < nodes.length; i++ ) {
  764. var testNode = nodes[i];
  765. if( testNode.parentNode === container ) {
  766. return testNode;
  767. }
  768. }
  769. // If no node was found, create it now
  770. var node = document.createElement( tagname );
  771. node.className = classname;
  772. if( typeof innerHTML === 'string' ) {
  773. node.innerHTML = innerHTML;
  774. }
  775. container.appendChild( node );
  776. return node;
  777. }
  778. /**
  779. * Creates the slide background elements and appends them
  780. * to the background container. One element is created per
  781. * slide no matter if the given slide has visible background.
  782. */
  783. function createBackgrounds() {
  784. var printMode = isPrintingPDF();
  785. // Clear prior backgrounds
  786. dom.background.innerHTML = '';
  787. dom.background.classList.add( 'no-transition' );
  788. // Iterate over all horizontal slides
  789. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  790. var backgroundStack = createBackground( slideh, dom.background );
  791. // Iterate over all vertical slides
  792. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  793. createBackground( slidev, backgroundStack );
  794. backgroundStack.classList.add( 'stack' );
  795. } );
  796. } );
  797. // Add parallax background if specified
  798. if( config.parallaxBackgroundImage ) {
  799. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  800. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  801. dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat;
  802. dom.background.style.backgroundPosition = config.parallaxBackgroundPosition;
  803. // Make sure the below properties are set on the element - these properties are
  804. // needed for proper transitions to be set on the element via CSS. To remove
  805. // annoying background slide-in effect when the presentation starts, apply
  806. // these properties after short time delay
  807. setTimeout( function() {
  808. dom.wrapper.classList.add( 'has-parallax-background' );
  809. }, 1 );
  810. }
  811. else {
  812. dom.background.style.backgroundImage = '';
  813. dom.wrapper.classList.remove( 'has-parallax-background' );
  814. }
  815. }
  816. /**
  817. * Creates a background for the given slide.
  818. *
  819. * @param {HTMLElement} slide
  820. * @param {HTMLElement} container The element that the background
  821. * should be appended to
  822. * @return {HTMLElement} New background div
  823. */
  824. function createBackground( slide, container ) {
  825. // Main slide background element
  826. var element = document.createElement( 'div' );
  827. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  828. // Inner background element that wraps images/videos/iframes
  829. var contentElement = document.createElement( 'div' );
  830. contentElement.className = 'slide-background-content';
  831. element.appendChild( contentElement );
  832. container.appendChild( element );
  833. slide.slideBackgroundElement = element;
  834. slide.slideBackgroundContentElement = contentElement;
  835. // Syncs the background to reflect all current background settings
  836. syncBackground( slide );
  837. return element;
  838. }
  839. /**
  840. * Renders all of the visual properties of a slide background
  841. * based on the various background attributes.
  842. *
  843. * @param {HTMLElement} slide
  844. */
  845. function syncBackground( slide ) {
  846. var element = slide.slideBackgroundElement,
  847. contentElement = slide.slideBackgroundContentElement;
  848. // Reset the prior background state in case this is not the
  849. // initial sync
  850. slide.classList.remove( 'has-dark-background' );
  851. slide.classList.remove( 'has-light-background' );
  852. element.removeAttribute( 'data-loaded' );
  853. element.removeAttribute( 'data-background-hash' );
  854. element.removeAttribute( 'data-background-size' );
  855. element.removeAttribute( 'data-background-transition' );
  856. element.style.backgroundColor = '';
  857. contentElement.style.backgroundSize = '';
  858. contentElement.style.backgroundRepeat = '';
  859. contentElement.style.backgroundPosition = '';
  860. contentElement.style.backgroundImage = '';
  861. contentElement.style.opacity = '';
  862. contentElement.innerHTML = '';
  863. var data = {
  864. background: slide.getAttribute( 'data-background' ),
  865. backgroundSize: slide.getAttribute( 'data-background-size' ),
  866. backgroundImage: slide.getAttribute( 'data-background-image' ),
  867. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  868. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  869. backgroundColor: slide.getAttribute( 'data-background-color' ),
  870. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  871. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  872. backgroundTransition: slide.getAttribute( 'data-background-transition' ),
  873. backgroundOpacity: slide.getAttribute( 'data-background-opacity' )
  874. };
  875. if( data.background ) {
  876. // Auto-wrap image urls in url(...)
  877. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) {
  878. slide.setAttribute( 'data-background-image', data.background );
  879. }
  880. else {
  881. element.style.background = data.background;
  882. }
  883. }
  884. // Create a hash for this combination of background settings.
  885. // This is used to determine when two slide backgrounds are
  886. // the same.
  887. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  888. element.setAttribute( 'data-background-hash', data.background +
  889. data.backgroundSize +
  890. data.backgroundImage +
  891. data.backgroundVideo +
  892. data.backgroundIframe +
  893. data.backgroundColor +
  894. data.backgroundRepeat +
  895. data.backgroundPosition +
  896. data.backgroundTransition +
  897. data.backgroundOpacity );
  898. }
  899. // Additional and optional background properties
  900. if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );
  901. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  902. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  903. // Background image options are set on the content wrapper
  904. if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
  905. if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;
  906. if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;
  907. if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;
  908. // If this slide has a background color, we add a class that
  909. // signals if it is light or dark. If the slide has no background
  910. // color, no class will be added
  911. var contrastColor = data.backgroundColor;
  912. // If no bg color was found, check the computed background
  913. if( !contrastColor ) {
  914. var computedBackgroundStyle = window.getComputedStyle( element );
  915. if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
  916. contrastColor = computedBackgroundStyle.backgroundColor;
  917. }
  918. }
  919. if( contrastColor ) {
  920. var rgb = colorToRgb( contrastColor );
  921. // Ignore fully transparent backgrounds. Some browsers return
  922. // rgba(0,0,0,0) when reading the computed background color of
  923. // an element with no background
  924. if( rgb && rgb.a !== 0 ) {
  925. if( colorBrightness( contrastColor ) < 128 ) {
  926. slide.classList.add( 'has-dark-background' );
  927. }
  928. else {
  929. slide.classList.add( 'has-light-background' );
  930. }
  931. }
  932. }
  933. }
  934. /**
  935. * Registers a listener to postMessage events, this makes it
  936. * possible to call all reveal.js API methods from another
  937. * window. For example:
  938. *
  939. * revealWindow.postMessage( JSON.stringify({
  940. * method: 'slide',
  941. * args: [ 2 ]
  942. * }), '*' );
  943. */
  944. function setupPostMessage() {
  945. if( config.postMessage ) {
  946. window.addEventListener( 'message', function ( event ) {
  947. var data = event.data;
  948. // Make sure we're dealing with JSON
  949. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  950. data = JSON.parse( data );
  951. // Check if the requested method can be found
  952. if( data.method && typeof Reveal[data.method] === 'function' ) {
  953. Reveal[data.method].apply( Reveal, data.args );
  954. }
  955. }
  956. }, false );
  957. }
  958. }
  959. /**
  960. * Applies the configuration settings from the config
  961. * object. May be called multiple times.
  962. *
  963. * @param {object} options
  964. */
  965. function configure( options ) {
  966. var oldTransition = config.transition;
  967. // New config options may be passed when this method
  968. // is invoked through the API after initialization
  969. if( typeof options === 'object' ) extend( config, options );
  970. // Abort if reveal.js hasn't finished loading, config
  971. // changes will be applied automatically once loading
  972. // finishes
  973. if( loaded === false ) return;
  974. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  975. // Remove the previously configured transition class
  976. dom.wrapper.classList.remove( oldTransition );
  977. // Force linear transition based on browser capabilities
  978. if( features.transforms3d === false ) config.transition = 'linear';
  979. dom.wrapper.classList.add( config.transition );
  980. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  981. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  982. dom.controls.style.display = config.controls ? 'block' : 'none';
  983. dom.progress.style.display = config.progress ? 'block' : 'none';
  984. dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout );
  985. dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
  986. if( config.shuffle ) {
  987. shuffle();
  988. }
  989. if( config.rtl ) {
  990. dom.wrapper.classList.add( 'rtl' );
  991. }
  992. else {
  993. dom.wrapper.classList.remove( 'rtl' );
  994. }
  995. if( config.center ) {
  996. dom.wrapper.classList.add( 'center' );
  997. }
  998. else {
  999. dom.wrapper.classList.remove( 'center' );
  1000. }
  1001. // Exit the paused mode if it was configured off
  1002. if( config.pause === false ) {
  1003. resume();
  1004. }
  1005. if( config.showNotes ) {
  1006. dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
  1007. }
  1008. if( config.mouseWheel ) {
  1009. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1010. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1011. }
  1012. else {
  1013. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  1014. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  1015. }
  1016. // Rolling 3D links
  1017. if( config.rollingLinks ) {
  1018. enableRollingLinks();
  1019. }
  1020. else {
  1021. disableRollingLinks();
  1022. }
  1023. // Auto-hide the mouse pointer when its inactive
  1024. if( config.hideInactiveCursor ) {
  1025. document.addEventListener( 'mousemove', onDocumentCursorActive, false );
  1026. document.addEventListener( 'mousedown', onDocumentCursorActive, false );
  1027. }
  1028. else {
  1029. showCursor();
  1030. document.removeEventListener( 'mousemove', onDocumentCursorActive, false );
  1031. document.removeEventListener( 'mousedown', onDocumentCursorActive, false );
  1032. }
  1033. // Iframe link previews
  1034. if( config.previewLinks ) {
  1035. enablePreviewLinks();
  1036. disablePreviewLinks( '[data-preview-link=false]' );
  1037. }
  1038. else {
  1039. disablePreviewLinks();
  1040. enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
  1041. }
  1042. // Remove existing auto-slide controls
  1043. if( autoSlidePlayer ) {
  1044. autoSlidePlayer.destroy();
  1045. autoSlidePlayer = null;
  1046. }
  1047. // Generate auto-slide controls if needed
  1048. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  1049. autoSlidePlayer = new Playback( dom.wrapper, function() {
  1050. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  1051. } );
  1052. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  1053. autoSlidePaused = false;
  1054. }
  1055. // When fragments are turned off they should be visible
  1056. if( config.fragments === false ) {
  1057. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  1058. element.classList.add( 'visible' );
  1059. element.classList.remove( 'current-fragment' );
  1060. } );
  1061. }
  1062. // Slide numbers
  1063. var slideNumberDisplay = 'none';
  1064. if( config.slideNumber && !isPrintingPDF() ) {
  1065. if( config.showSlideNumber === 'all' ) {
  1066. slideNumberDisplay = 'block';
  1067. }
  1068. else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) {
  1069. slideNumberDisplay = 'block';
  1070. }
  1071. }
  1072. dom.slideNumber.style.display = slideNumberDisplay;
  1073. // Add the navigation mode to the DOM so we can adjust styling
  1074. if( config.navigationMode !== 'default' ) {
  1075. dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );
  1076. }
  1077. else {
  1078. dom.wrapper.removeAttribute( 'data-navigation-mode' );
  1079. }
  1080. sync();
  1081. }
  1082. /**
  1083. * Binds all event listeners.
  1084. */
  1085. function addEventListeners() {
  1086. eventsAreBound = true;
  1087. window.addEventListener( 'hashchange', onWindowHashChange, false );
  1088. window.addEventListener( 'resize', onWindowResize, false );
  1089. if( config.touch ) {
  1090. if( 'onpointerdown' in window ) {
  1091. // Use W3C pointer events
  1092. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  1093. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  1094. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  1095. }
  1096. else if( window.navigator.msPointerEnabled ) {
  1097. // IE 10 uses prefixed version of pointer events
  1098. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  1099. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  1100. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  1101. }
  1102. else {
  1103. // Fall back to touch events
  1104. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  1105. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  1106. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  1107. }
  1108. }
  1109. if( config.keyboard ) {
  1110. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  1111. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  1112. }
  1113. if( config.progress && dom.progress ) {
  1114. dom.progress.addEventListener( 'click', onProgressClicked, false );
  1115. }
  1116. dom.pauseOverlay.addEventListener( 'click', resume, false );
  1117. if( config.focusBodyOnPageVisibilityChange ) {
  1118. var visibilityChange;
  1119. if( 'hidden' in document ) {
  1120. visibilityChange = 'visibilitychange';
  1121. }
  1122. else if( 'msHidden' in document ) {
  1123. visibilityChange = 'msvisibilitychange';
  1124. }
  1125. else if( 'webkitHidden' in document ) {
  1126. visibilityChange = 'webkitvisibilitychange';
  1127. }
  1128. if( visibilityChange ) {
  1129. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  1130. }
  1131. }
  1132. // Listen to both touch and click events, in case the device
  1133. // supports both
  1134. var pointerEvents = [ 'touchstart', 'click' ];
  1135. // Only support touch for Android, fixes double navigations in
  1136. // stock browser
  1137. if( UA.match( /android/gi ) ) {
  1138. pointerEvents = [ 'touchstart' ];
  1139. }
  1140. pointerEvents.forEach( function( eventName ) {
  1141. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  1142. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  1143. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  1144. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  1145. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  1146. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  1147. } );
  1148. }
  1149. /**
  1150. * Unbinds all event listeners.
  1151. */
  1152. function removeEventListeners() {
  1153. eventsAreBound = false;
  1154. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  1155. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  1156. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  1157. window.removeEventListener( 'resize', onWindowResize, false );
  1158. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  1159. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  1160. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  1161. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  1162. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  1163. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  1164. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  1165. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  1166. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  1167. dom.pauseOverlay.removeEventListener( 'click', resume, false );
  1168. if ( config.progress && dom.progress ) {
  1169. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  1170. }
  1171. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  1172. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  1173. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  1174. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  1175. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  1176. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  1177. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  1178. } );
  1179. }
  1180. /**
  1181. * Add a custom key binding with optional description to
  1182. * be added to the help screen.
  1183. */
  1184. function addKeyBinding( binding, callback ) {
  1185. if( typeof binding === 'object' && binding.keyCode ) {
  1186. registeredKeyBindings[binding.keyCode] = {
  1187. callback: callback,
  1188. key: binding.key,
  1189. description: binding.description
  1190. };
  1191. }
  1192. else {
  1193. registeredKeyBindings[binding] = {
  1194. callback: callback,
  1195. key: null,
  1196. description: null
  1197. };
  1198. }
  1199. }
  1200. /**
  1201. * Removes the specified custom key binding.
  1202. */
  1203. function removeKeyBinding( keyCode ) {
  1204. delete registeredKeyBindings[keyCode];
  1205. }
  1206. /**
  1207. * Extend object a with the properties of object b.
  1208. * If there's a conflict, object b takes precedence.
  1209. *
  1210. * @param {object} a
  1211. * @param {object} b
  1212. */
  1213. function extend( a, b ) {
  1214. for( var i in b ) {
  1215. a[ i ] = b[ i ];
  1216. }
  1217. return a;
  1218. }
  1219. /**
  1220. * Converts the target object to an array.
  1221. *
  1222. * @param {object} o
  1223. * @return {object[]}
  1224. */
  1225. function toArray( o ) {
  1226. return Array.prototype.slice.call( o );
  1227. }
  1228. /**
  1229. * Utility for deserializing a value.
  1230. *
  1231. * @param {*} value
  1232. * @return {*}
  1233. */
  1234. function deserialize( value ) {
  1235. if( typeof value === 'string' ) {
  1236. if( value === 'null' ) return null;
  1237. else if( value === 'true' ) return true;
  1238. else if( value === 'false' ) return false;
  1239. else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value );
  1240. }
  1241. return value;
  1242. }
  1243. /**
  1244. * Measures the distance in pixels between point a
  1245. * and point b.
  1246. *
  1247. * @param {object} a point with x/y properties
  1248. * @param {object} b point with x/y properties
  1249. *
  1250. * @return {number}
  1251. */
  1252. function distanceBetween( a, b ) {
  1253. var dx = a.x - b.x,
  1254. dy = a.y - b.y;
  1255. return Math.sqrt( dx*dx + dy*dy );
  1256. }
  1257. /**
  1258. * Applies a CSS transform to the target element.
  1259. *
  1260. * @param {HTMLElement} element
  1261. * @param {string} transform
  1262. */
  1263. function transformElement( element, transform ) {
  1264. element.style.WebkitTransform = transform;
  1265. element.style.MozTransform = transform;
  1266. element.style.msTransform = transform;
  1267. element.style.transform = transform;
  1268. }
  1269. /**
  1270. * Applies CSS transforms to the slides container. The container
  1271. * is transformed from two separate sources: layout and the overview
  1272. * mode.
  1273. *
  1274. * @param {object} transforms
  1275. */
  1276. function transformSlides( transforms ) {
  1277. // Pick up new transforms from arguments
  1278. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  1279. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  1280. // Apply the transforms to the slides container
  1281. if( slidesTransform.layout ) {
  1282. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  1283. }
  1284. else {
  1285. transformElement( dom.slides, slidesTransform.overview );
  1286. }
  1287. }
  1288. /**
  1289. * Injects the given CSS styles into the DOM.
  1290. *
  1291. * @param {string} value
  1292. */
  1293. function injectStyleSheet( value ) {
  1294. var tag = document.createElement( 'style' );
  1295. tag.type = 'text/css';
  1296. if( tag.styleSheet ) {
  1297. tag.styleSheet.cssText = value;
  1298. }
  1299. else {
  1300. tag.appendChild( document.createTextNode( value ) );
  1301. }
  1302. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  1303. }
  1304. /**
  1305. * Find the closest parent that matches the given
  1306. * selector.
  1307. *
  1308. * @param {HTMLElement} target The child element
  1309. * @param {String} selector The CSS selector to match
  1310. * the parents against
  1311. *
  1312. * @return {HTMLElement} The matched parent or null
  1313. * if no matching parent was found
  1314. */
  1315. function closestParent( target, selector ) {
  1316. var parent = target.parentNode;
  1317. while( parent ) {
  1318. // There's some overhead doing this each time, we don't
  1319. // want to rewrite the element prototype but should still
  1320. // be enough to feature detect once at startup...
  1321. var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
  1322. // If we find a match, we're all set
  1323. if( matchesMethod && matchesMethod.call( parent, selector ) ) {
  1324. return parent;
  1325. }
  1326. // Keep searching
  1327. parent = parent.parentNode;
  1328. }
  1329. return null;
  1330. }
  1331. /**
  1332. * Converts various color input formats to an {r:0,g:0,b:0} object.
  1333. *
  1334. * @param {string} color The string representation of a color
  1335. * @example
  1336. * colorToRgb('#000');
  1337. * @example
  1338. * colorToRgb('#000000');
  1339. * @example
  1340. * colorToRgb('rgb(0,0,0)');
  1341. * @example
  1342. * colorToRgb('rgba(0,0,0)');
  1343. *
  1344. * @return {{r: number, g: number, b: number, [a]: number}|null}
  1345. */
  1346. function colorToRgb( color ) {
  1347. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  1348. if( hex3 && hex3[1] ) {
  1349. hex3 = hex3[1];
  1350. return {
  1351. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  1352. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  1353. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  1354. };
  1355. }
  1356. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  1357. if( hex6 && hex6[1] ) {
  1358. hex6 = hex6[1];
  1359. return {
  1360. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  1361. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  1362. b: parseInt( hex6.substr( 4, 2 ), 16 )
  1363. };
  1364. }
  1365. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  1366. if( rgb ) {
  1367. return {
  1368. r: parseInt( rgb[1], 10 ),
  1369. g: parseInt( rgb[2], 10 ),
  1370. b: parseInt( rgb[3], 10 )
  1371. };
  1372. }
  1373. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  1374. if( rgba ) {
  1375. return {
  1376. r: parseInt( rgba[1], 10 ),
  1377. g: parseInt( rgba[2], 10 ),
  1378. b: parseInt( rgba[3], 10 ),
  1379. a: parseFloat( rgba[4] )
  1380. };
  1381. }
  1382. return null;
  1383. }
  1384. /**
  1385. * Calculates brightness on a scale of 0-255.
  1386. *
  1387. * @param {string} color See colorToRgb for supported formats.
  1388. * @see {@link colorToRgb}
  1389. */
  1390. function colorBrightness( color ) {
  1391. if( typeof color === 'string' ) color = colorToRgb( color );
  1392. if( color ) {
  1393. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  1394. }
  1395. return null;
  1396. }
  1397. /**
  1398. * Returns the remaining height within the parent of the
  1399. * target element.
  1400. *
  1401. * remaining height = [ configured parent height ] - [ current parent height ]
  1402. *
  1403. * @param {HTMLElement} element
  1404. * @param {number} [height]
  1405. */
  1406. function getRemainingHeight( element, height ) {
  1407. height = height || 0;
  1408. if( element ) {
  1409. var newHeight, oldHeight = element.style.height;
  1410. // Change the .stretch element height to 0 in order find the height of all
  1411. // the other elements
  1412. element.style.height = '0px';
  1413. // In Overview mode, the parent (.slide) height is set of 700px.
  1414. // Restore it temporarily to its natural height.
  1415. element.parentNode.style.height = 'auto';
  1416. newHeight = height - element.parentNode.offsetHeight;
  1417. // Restore the old height, just in case
  1418. element.style.height = oldHeight + 'px';
  1419. // Clear the parent (.slide) height. .removeProperty works in IE9+
  1420. element.parentNode.style.removeProperty('height');
  1421. return newHeight;
  1422. }
  1423. return height;
  1424. }
  1425. /**
  1426. * Checks if this instance is being used to print a PDF.
  1427. */
  1428. function isPrintingPDF() {
  1429. return ( /print-pdf/gi ).test( window.location.search );
  1430. }
  1431. /**
  1432. * Check if this instance is being used to print a PDF with fragments.
  1433. */
  1434. function isPrintingPDFFragments() {
  1435. return ( /print-pdf-fragments/gi ).test( window.location.search );
  1436. }
  1437. /**
  1438. * Hides the address bar if we're on a mobile device.
  1439. */
  1440. function hideAddressBar() {
  1441. if( config.hideAddressBar && isMobileDevice ) {
  1442. // Events that should trigger the address bar to hide
  1443. window.addEventListener( 'load', removeAddressBar, false );
  1444. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1445. }
  1446. }
  1447. /**
  1448. * Causes the address bar to hide on mobile devices,
  1449. * more vertical space ftw.
  1450. */
  1451. function removeAddressBar() {
  1452. setTimeout( function() {
  1453. window.scrollTo( 0, 1 );
  1454. }, 10 );
  1455. }
  1456. /**
  1457. * Dispatches an event of the specified type from the
  1458. * reveal DOM element.
  1459. */
  1460. function dispatchEvent( type, args ) {
  1461. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1462. event.initEvent( type, true, true );
  1463. extend( event, args );
  1464. dom.wrapper.dispatchEvent( event );
  1465. // If we're in an iframe, post each reveal.js event to the
  1466. // parent window. Used by the notes plugin
  1467. if( config.postMessageEvents && window.parent !== window.self ) {
  1468. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  1469. }
  1470. }
  1471. /**
  1472. * Wrap all links in 3D goodness.
  1473. */
  1474. function enableRollingLinks() {
  1475. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1476. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1477. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1478. var anchor = anchors[i];
  1479. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1480. var span = document.createElement('span');
  1481. span.setAttribute('data-title', anchor.text);
  1482. span.innerHTML = anchor.innerHTML;
  1483. anchor.classList.add( 'roll' );
  1484. anchor.innerHTML = '';
  1485. anchor.appendChild(span);
  1486. }
  1487. }
  1488. }
  1489. }
  1490. /**
  1491. * Unwrap all 3D links.
  1492. */
  1493. function disableRollingLinks() {
  1494. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1495. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1496. var anchor = anchors[i];
  1497. var span = anchor.querySelector( 'span' );
  1498. if( span ) {
  1499. anchor.classList.remove( 'roll' );
  1500. anchor.innerHTML = span.innerHTML;
  1501. }
  1502. }
  1503. }
  1504. /**
  1505. * Bind preview frame links.
  1506. *
  1507. * @param {string} [selector=a] - selector for anchors
  1508. */
  1509. function enablePreviewLinks( selector ) {
  1510. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1511. anchors.forEach( function( element ) {
  1512. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1513. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1514. }
  1515. } );
  1516. }
  1517. /**
  1518. * Unbind preview frame links.
  1519. */
  1520. function disablePreviewLinks( selector ) {
  1521. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1522. anchors.forEach( function( element ) {
  1523. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1524. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1525. }
  1526. } );
  1527. }
  1528. /**
  1529. * Opens a preview window for the target URL.
  1530. *
  1531. * @param {string} url - url for preview iframe src
  1532. */
  1533. function showPreview( url ) {
  1534. closeOverlay();
  1535. dom.overlay = document.createElement( 'div' );
  1536. dom.overlay.classList.add( 'overlay' );
  1537. dom.overlay.classList.add( 'overlay-preview' );
  1538. dom.wrapper.appendChild( dom.overlay );
  1539. dom.overlay.innerHTML = [
  1540. '<header>',
  1541. '<a class="close" href="#"><span class="icon"></span></a>',
  1542. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1543. '</header>',
  1544. '<div class="spinner"></div>',
  1545. '<div class="viewport">',
  1546. '<iframe src="'+ url +'"></iframe>',
  1547. '<small class="viewport-inner">',
  1548. '<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>',
  1549. '</small>',
  1550. '</div>'
  1551. ].join('');
  1552. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1553. dom.overlay.classList.add( 'loaded' );
  1554. }, false );
  1555. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1556. closeOverlay();
  1557. event.preventDefault();
  1558. }, false );
  1559. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1560. closeOverlay();
  1561. }, false );
  1562. setTimeout( function() {
  1563. dom.overlay.classList.add( 'visible' );
  1564. }, 1 );
  1565. }
  1566. /**
  1567. * Open or close help overlay window.
  1568. *
  1569. * @param {Boolean} [override] Flag which overrides the
  1570. * toggle logic and forcibly sets the desired state. True means
  1571. * help is open, false means it's closed.
  1572. */
  1573. function toggleHelp( override ){
  1574. if( typeof override === 'boolean' ) {
  1575. override ? showHelp() : closeOverlay();
  1576. }
  1577. else {
  1578. if( dom.overlay ) {
  1579. closeOverlay();
  1580. }
  1581. else {
  1582. showHelp();
  1583. }
  1584. }
  1585. }
  1586. /**
  1587. * Opens an overlay window with help material.
  1588. */
  1589. function showHelp() {
  1590. if( config.help ) {
  1591. closeOverlay();
  1592. dom.overlay = document.createElement( 'div' );
  1593. dom.overlay.classList.add( 'overlay' );
  1594. dom.overlay.classList.add( 'overlay-help' );
  1595. dom.wrapper.appendChild( dom.overlay );
  1596. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1597. html += '<table><th>KEY</th><th>ACTION</th>';
  1598. for( var key in keyboardShortcuts ) {
  1599. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1600. }
  1601. // Add custom key bindings that have associated descriptions
  1602. for( var binding in registeredKeyBindings ) {
  1603. if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) {
  1604. html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</td></tr>';
  1605. }
  1606. }
  1607. html += '</table>';
  1608. dom.overlay.innerHTML = [
  1609. '<header>',
  1610. '<a class="close" href="#"><span class="icon"></span></a>',
  1611. '</header>',
  1612. '<div class="viewport">',
  1613. '<div class="viewport-inner">'+ html +'</div>',
  1614. '</div>'
  1615. ].join('');
  1616. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1617. closeOverlay();
  1618. event.preventDefault();
  1619. }, false );
  1620. setTimeout( function() {
  1621. dom.overlay.classList.add( 'visible' );
  1622. }, 1 );
  1623. }
  1624. }
  1625. /**
  1626. * Closes any currently open overlay.
  1627. */
  1628. function closeOverlay() {
  1629. if( dom.overlay ) {
  1630. dom.overlay.parentNode.removeChild( dom.overlay );
  1631. dom.overlay = null;
  1632. }
  1633. }
  1634. /**
  1635. * Applies JavaScript-controlled layout rules to the
  1636. * presentation.
  1637. */
  1638. function layout() {
  1639. if( dom.wrapper && !isPrintingPDF() ) {
  1640. if( !config.disableLayout ) {
  1641. // On some mobile devices '100vh' is taller than the visible
  1642. // viewport which leads to part of the presentation being
  1643. // cut off. To work around this we define our own '--vh' custom
  1644. // property where 100x adds up to the correct height.
  1645. //
  1646. // https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
  1647. if( isMobileDevice ) {
  1648. document.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );
  1649. }
  1650. var size = getComputedSlideSize();
  1651. var oldScale = scale;
  1652. // Layout the contents of the slides
  1653. layoutSlideContents( config.width, config.height );
  1654. dom.slides.style.width = size.width + 'px';
  1655. dom.slides.style.height = size.height + 'px';
  1656. // Determine scale of content to fit within available space
  1657. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1658. // Respect max/min scale settings
  1659. scale = Math.max( scale, config.minScale );
  1660. scale = Math.min( scale, config.maxScale );
  1661. // Don't apply any scaling styles if scale is 1
  1662. if( scale === 1 ) {
  1663. dom.slides.style.zoom = '';
  1664. dom.slides.style.left = '';
  1665. dom.slides.style.top = '';
  1666. dom.slides.style.bottom = '';
  1667. dom.slides.style.right = '';
  1668. transformSlides( { layout: '' } );
  1669. }
  1670. else {
  1671. // Prefer zoom for scaling up so that content remains crisp.
  1672. // Don't use zoom to scale down since that can lead to shifts
  1673. // in text layout/line breaks.
  1674. if( scale > 1 && features.zoom ) {
  1675. dom.slides.style.zoom = scale;
  1676. dom.slides.style.left = '';
  1677. dom.slides.style.top = '';
  1678. dom.slides.style.bottom = '';
  1679. dom.slides.style.right = '';
  1680. transformSlides( { layout: '' } );
  1681. }
  1682. // Apply scale transform as a fallback
  1683. else {
  1684. dom.slides.style.zoom = '';
  1685. dom.slides.style.left = '50%';
  1686. dom.slides.style.top = '50%';
  1687. dom.slides.style.bottom = 'auto';
  1688. dom.slides.style.right = 'auto';
  1689. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1690. }
  1691. }
  1692. // Select all slides, vertical and horizontal
  1693. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1694. for( var i = 0, len = slides.length; i < len; i++ ) {
  1695. var slide = slides[ i ];
  1696. // Don't bother updating invisible slides
  1697. if( slide.style.display === 'none' ) {
  1698. continue;
  1699. }
  1700. if( config.center || slide.classList.contains( 'center' ) ) {
  1701. // Vertical stacks are not centred since their section
  1702. // children will be
  1703. if( slide.classList.contains( 'stack' ) ) {
  1704. slide.style.top = 0;
  1705. }
  1706. else {
  1707. slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
  1708. }
  1709. }
  1710. else {
  1711. slide.style.top = '';
  1712. }
  1713. }
  1714. if( oldScale !== scale ) {
  1715. dispatchEvent( 'resize', {
  1716. 'oldScale': oldScale,
  1717. 'scale': scale,
  1718. 'size': size
  1719. } );
  1720. }
  1721. }
  1722. updateProgress();
  1723. updateParallax();
  1724. if( isOverview() ) {
  1725. updateOverview();
  1726. }
  1727. }
  1728. }
  1729. /**
  1730. * Applies layout logic to the contents of all slides in
  1731. * the presentation.
  1732. *
  1733. * @param {string|number} width
  1734. * @param {string|number} height
  1735. */
  1736. function layoutSlideContents( width, height ) {
  1737. // Handle sizing of elements with the 'stretch' class
  1738. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1739. // Determine how much vertical space we can use
  1740. var remainingHeight = getRemainingHeight( element, height );
  1741. // Consider the aspect ratio of media elements
  1742. if( /(img|video)/gi.test( element.nodeName ) ) {
  1743. var nw = element.naturalWidth || element.videoWidth,
  1744. nh = element.naturalHeight || element.videoHeight;
  1745. var es = Math.min( width / nw, remainingHeight / nh );
  1746. element.style.width = ( nw * es ) + 'px';
  1747. element.style.height = ( nh * es ) + 'px';
  1748. }
  1749. else {
  1750. element.style.width = width + 'px';
  1751. element.style.height = remainingHeight + 'px';
  1752. }
  1753. } );
  1754. }
  1755. /**
  1756. * Calculates the computed pixel size of our slides. These
  1757. * values are based on the width and height configuration
  1758. * options.
  1759. *
  1760. * @param {number} [presentationWidth=dom.wrapper.offsetWidth]
  1761. * @param {number} [presentationHeight=dom.wrapper.offsetHeight]
  1762. */
  1763. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1764. var size = {
  1765. // Slide size
  1766. width: config.width,
  1767. height: config.height,
  1768. // Presentation size
  1769. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1770. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1771. };
  1772. // Reduce available space by margin
  1773. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1774. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1775. // Slide width may be a percentage of available width
  1776. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1777. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1778. }
  1779. // Slide height may be a percentage of available height
  1780. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1781. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1782. }
  1783. return size;
  1784. }
  1785. /**
  1786. * Stores the vertical index of a stack so that the same
  1787. * vertical slide can be selected when navigating to and
  1788. * from the stack.
  1789. *
  1790. * @param {HTMLElement} stack The vertical stack element
  1791. * @param {string|number} [v=0] Index to memorize
  1792. */
  1793. function setPreviousVerticalIndex( stack, v ) {
  1794. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1795. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1796. }
  1797. }
  1798. /**
  1799. * Retrieves the vertical index which was stored using
  1800. * #setPreviousVerticalIndex() or 0 if no previous index
  1801. * exists.
  1802. *
  1803. * @param {HTMLElement} stack The vertical stack element
  1804. */
  1805. function getPreviousVerticalIndex( stack ) {
  1806. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1807. // Prefer manually defined start-indexv
  1808. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1809. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1810. }
  1811. return 0;
  1812. }
  1813. /**
  1814. * Displays the overview of slides (quick nav) by scaling
  1815. * down and arranging all slide elements.
  1816. */
  1817. function activateOverview() {
  1818. // Only proceed if enabled in config
  1819. if( config.overview && !isOverview() ) {
  1820. overview = true;
  1821. dom.wrapper.classList.add( 'overview' );
  1822. dom.wrapper.classList.remove( 'overview-deactivating' );
  1823. if( features.overviewTransitions ) {
  1824. setTimeout( function() {
  1825. dom.wrapper.classList.add( 'overview-animated' );
  1826. }, 1 );
  1827. }
  1828. // Don't auto-slide while in overview mode
  1829. cancelAutoSlide();
  1830. // Move the backgrounds element into the slide container to
  1831. // that the same scaling is applied
  1832. dom.slides.appendChild( dom.background );
  1833. // Clicking on an overview slide navigates to it
  1834. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1835. if( !slide.classList.contains( 'stack' ) ) {
  1836. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1837. }
  1838. } );
  1839. // Calculate slide sizes
  1840. var margin = 70;
  1841. var slideSize = getComputedSlideSize();
  1842. overviewSlideWidth = slideSize.width + margin;
  1843. overviewSlideHeight = slideSize.height + margin;
  1844. // Reverse in RTL mode
  1845. if( config.rtl ) {
  1846. overviewSlideWidth = -overviewSlideWidth;
  1847. }
  1848. updateSlidesVisibility();
  1849. layoutOverview();
  1850. updateOverview();
  1851. layout();
  1852. // Notify observers of the overview showing
  1853. dispatchEvent( 'overviewshown', {
  1854. 'indexh': indexh,
  1855. 'indexv': indexv,
  1856. 'currentSlide': currentSlide
  1857. } );
  1858. }
  1859. }
  1860. /**
  1861. * Uses CSS transforms to position all slides in a grid for
  1862. * display inside of the overview mode.
  1863. */
  1864. function layoutOverview() {
  1865. // Layout slides
  1866. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1867. hslide.setAttribute( 'data-index-h', h );
  1868. transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1869. if( hslide.classList.contains( 'stack' ) ) {
  1870. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1871. vslide.setAttribute( 'data-index-h', h );
  1872. vslide.setAttribute( 'data-index-v', v );
  1873. transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1874. } );
  1875. }
  1876. } );
  1877. // Layout slide backgrounds
  1878. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1879. transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1880. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1881. transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1882. } );
  1883. } );
  1884. }
  1885. /**
  1886. * Moves the overview viewport to the current slides.
  1887. * Called each time the current slide changes.
  1888. */
  1889. function updateOverview() {
  1890. var vmin = Math.min( window.innerWidth, window.innerHeight );
  1891. var scale = Math.max( vmin / 5, 150 ) / vmin;
  1892. transformSlides( {
  1893. overview: [
  1894. 'scale('+ scale +')',
  1895. 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
  1896. 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)'
  1897. ].join( ' ' )
  1898. } );
  1899. }
  1900. /**
  1901. * Exits the slide overview and enters the currently
  1902. * active slide.
  1903. */
  1904. function deactivateOverview() {
  1905. // Only proceed if enabled in config
  1906. if( config.overview ) {
  1907. overview = false;
  1908. dom.wrapper.classList.remove( 'overview' );
  1909. dom.wrapper.classList.remove( 'overview-animated' );
  1910. // Temporarily add a class so that transitions can do different things
  1911. // depending on whether they are exiting/entering overview, or just
  1912. // moving from slide to slide
  1913. dom.wrapper.classList.add( 'overview-deactivating' );
  1914. setTimeout( function () {
  1915. dom.wrapper.classList.remove( 'overview-deactivating' );
  1916. }, 1 );
  1917. // Move the background element back out
  1918. dom.wrapper.appendChild( dom.background );
  1919. // Clean up changes made to slides
  1920. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1921. transformElement( slide, '' );
  1922. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1923. } );
  1924. // Clean up changes made to backgrounds
  1925. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  1926. transformElement( background, '' );
  1927. } );
  1928. transformSlides( { overview: '' } );
  1929. slide( indexh, indexv );
  1930. layout();
  1931. cueAutoSlide();
  1932. // Notify observers of the overview hiding
  1933. dispatchEvent( 'overviewhidden', {
  1934. 'indexh': indexh,
  1935. 'indexv': indexv,
  1936. 'currentSlide': currentSlide
  1937. } );
  1938. }
  1939. }
  1940. /**
  1941. * Toggles the slide overview mode on and off.
  1942. *
  1943. * @param {Boolean} [override] Flag which overrides the
  1944. * toggle logic and forcibly sets the desired state. True means
  1945. * overview is open, false means it's closed.
  1946. */
  1947. function toggleOverview( override ) {
  1948. if( typeof override === 'boolean' ) {
  1949. override ? activateOverview() : deactivateOverview();
  1950. }
  1951. else {
  1952. isOverview() ? deactivateOverview() : activateOverview();
  1953. }
  1954. }
  1955. /**
  1956. * Checks if the overview is currently active.
  1957. *
  1958. * @return {Boolean} true if the overview is active,
  1959. * false otherwise
  1960. */
  1961. function isOverview() {
  1962. return overview;
  1963. }
  1964. /**
  1965. * Return a hash URL that will resolve to the current slide location.
  1966. */
  1967. function locationHash() {
  1968. var url = '/';
  1969. // Attempt to create a named link based on the slide's ID
  1970. var id = currentSlide ? currentSlide.getAttribute( 'id' ) : null;
  1971. if( id ) {
  1972. id = encodeURIComponent( id );
  1973. }
  1974. var indexf;
  1975. if( config.fragmentInURL ) {
  1976. indexf = getIndices().f;
  1977. }
  1978. // If the current slide has an ID, use that as a named link,
  1979. // but we don't support named links with a fragment index
  1980. if( typeof id === 'string' && id.length && indexf === undefined ) {
  1981. url = '/' + id;
  1982. }
  1983. // Otherwise use the /h/v index
  1984. else {
  1985. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  1986. if( indexh > 0 || indexv > 0 || indexf !== undefined ) url += indexh + hashIndexBase;
  1987. if( indexv > 0 || indexf !== undefined ) url += '/' + (indexv + hashIndexBase );
  1988. if( indexf !== undefined ) url += '/' + indexf;
  1989. }
  1990. return url;
  1991. }
  1992. /**
  1993. * Checks if the current or specified slide is vertical
  1994. * (nested within another slide).
  1995. *
  1996. * @param {HTMLElement} [slide=currentSlide] The slide to check
  1997. * orientation of
  1998. * @return {Boolean}
  1999. */
  2000. function isVerticalSlide( slide ) {
  2001. // Prefer slide argument, otherwise use current slide
  2002. slide = slide ? slide : currentSlide;
  2003. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  2004. }
  2005. /**
  2006. * Handling the fullscreen functionality via the fullscreen API
  2007. *
  2008. * @see http://fullscreen.spec.whatwg.org/
  2009. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  2010. */
  2011. function enterFullscreen() {
  2012. var element = document.documentElement;
  2013. // Check which implementation is available
  2014. var requestMethod = element.requestFullscreen ||
  2015. element.webkitRequestFullscreen ||
  2016. element.webkitRequestFullScreen ||
  2017. element.mozRequestFullScreen ||
  2018. element.msRequestFullscreen;
  2019. if( requestMethod ) {
  2020. requestMethod.apply( element );
  2021. }
  2022. }
  2023. /**
  2024. * Shows the mouse pointer after it has been hidden with
  2025. * #hideCursor.
  2026. */
  2027. function showCursor() {
  2028. if( cursorHidden ) {
  2029. cursorHidden = false;
  2030. dom.wrapper.style.cursor = '';
  2031. }
  2032. }
  2033. /**
  2034. * Hides the mouse pointer when it's on top of the .reveal
  2035. * container.
  2036. */
  2037. function hideCursor() {
  2038. if( cursorHidden === false ) {
  2039. cursorHidden = true;
  2040. dom.wrapper.style.cursor = 'none';
  2041. }
  2042. }
  2043. /**
  2044. * Enters the paused mode which fades everything on screen to
  2045. * black.
  2046. */
  2047. function pause() {
  2048. if( config.pause ) {
  2049. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2050. cancelAutoSlide();
  2051. dom.wrapper.classList.add( 'paused' );
  2052. if( wasPaused === false ) {
  2053. dispatchEvent( 'paused' );
  2054. }
  2055. }
  2056. }
  2057. /**
  2058. * Exits from the paused mode.
  2059. */
  2060. function resume() {
  2061. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  2062. dom.wrapper.classList.remove( 'paused' );
  2063. cueAutoSlide();
  2064. if( wasPaused ) {
  2065. dispatchEvent( 'resumed' );
  2066. }
  2067. }
  2068. /**
  2069. * Toggles the paused mode on and off.
  2070. */
  2071. function togglePause( override ) {
  2072. if( typeof override === 'boolean' ) {
  2073. override ? pause() : resume();
  2074. }
  2075. else {
  2076. isPaused() ? resume() : pause();
  2077. }
  2078. }
  2079. /**
  2080. * Checks if we are currently in the paused mode.
  2081. *
  2082. * @return {Boolean}
  2083. */
  2084. function isPaused() {
  2085. return dom.wrapper.classList.contains( 'paused' );
  2086. }
  2087. /**
  2088. * Toggles the auto slide mode on and off.
  2089. *
  2090. * @param {Boolean} [override] Flag which sets the desired state.
  2091. * True means autoplay starts, false means it stops.
  2092. */
  2093. function toggleAutoSlide( override ) {
  2094. if( typeof override === 'boolean' ) {
  2095. override ? resumeAutoSlide() : pauseAutoSlide();
  2096. }
  2097. else {
  2098. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  2099. }
  2100. }
  2101. /**
  2102. * Checks if the auto slide mode is currently on.
  2103. *
  2104. * @return {Boolean}
  2105. */
  2106. function isAutoSliding() {
  2107. return !!( autoSlide && !autoSlidePaused );
  2108. }
  2109. /**
  2110. * Steps from the current point in the presentation to the
  2111. * slide which matches the specified horizontal and vertical
  2112. * indices.
  2113. *
  2114. * @param {number} [h=indexh] Horizontal index of the target slide
  2115. * @param {number} [v=indexv] Vertical index of the target slide
  2116. * @param {number} [f] Index of a fragment within the
  2117. * target slide to activate
  2118. * @param {number} [o] Origin for use in multimaster environments
  2119. */
  2120. function slide( h, v, f, o ) {
  2121. // Remember where we were at before
  2122. previousSlide = currentSlide;
  2123. // Query all horizontal slides in the deck
  2124. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  2125. // Abort if there are no slides
  2126. if( horizontalSlides.length === 0 ) return;
  2127. // If no vertical index is specified and the upcoming slide is a
  2128. // stack, resume at its previous vertical index
  2129. if( v === undefined && !isOverview() ) {
  2130. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  2131. }
  2132. // If we were on a vertical stack, remember what vertical index
  2133. // it was on so we can resume at the same position when returning
  2134. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  2135. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  2136. }
  2137. // Remember the state before this slide
  2138. var stateBefore = state.concat();
  2139. // Reset the state array
  2140. state.length = 0;
  2141. var indexhBefore = indexh || 0,
  2142. indexvBefore = indexv || 0;
  2143. // Activate and transition to the new slide
  2144. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  2145. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  2146. // Update the visibility of slides now that the indices have changed
  2147. updateSlidesVisibility();
  2148. layout();
  2149. // Update the overview if it's currently active
  2150. if( isOverview() ) {
  2151. updateOverview();
  2152. }
  2153. // Find the current horizontal slide and any possible vertical slides
  2154. // within it
  2155. var currentHorizontalSlide = horizontalSlides[ indexh ],
  2156. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  2157. // Store references to the previous and current slides
  2158. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  2159. // Show fragment, if specified
  2160. if( typeof f !== 'undefined' ) {
  2161. navigateFragment( f );
  2162. }
  2163. // Dispatch an event if the slide changed
  2164. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  2165. if (!slideChanged) {
  2166. // Ensure that the previous slide is never the same as the current
  2167. previousSlide = null;
  2168. }
  2169. // Solves an edge case where the previous slide maintains the
  2170. // 'present' class when navigating between adjacent vertical
  2171. // stacks
  2172. if( previousSlide && previousSlide !== currentSlide ) {
  2173. previousSlide.classList.remove( 'present' );
  2174. previousSlide.setAttribute( 'aria-hidden', 'true' );
  2175. // Reset all slides upon navigate to home
  2176. // Issue: #285
  2177. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  2178. // Launch async task
  2179. setTimeout( function () {
  2180. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  2181. for( i in slides ) {
  2182. if( slides[i] ) {
  2183. // Reset stack
  2184. setPreviousVerticalIndex( slides[i], 0 );
  2185. }
  2186. }
  2187. }, 0 );
  2188. }
  2189. }
  2190. // Apply the new state
  2191. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  2192. // Check if this state existed on the previous slide. If it
  2193. // did, we will avoid adding it repeatedly
  2194. for( var j = 0; j < stateBefore.length; j++ ) {
  2195. if( stateBefore[j] === state[i] ) {
  2196. stateBefore.splice( j, 1 );
  2197. continue stateLoop;
  2198. }
  2199. }
  2200. document.documentElement.classList.add( state[i] );
  2201. // Dispatch custom event matching the state's name
  2202. dispatchEvent( state[i] );
  2203. }
  2204. // Clean up the remains of the previous state
  2205. while( stateBefore.length ) {
  2206. document.documentElement.classList.remove( stateBefore.pop() );
  2207. }
  2208. if( slideChanged ) {
  2209. dispatchEvent( 'slidechanged', {
  2210. 'indexh': indexh,
  2211. 'indexv': indexv,
  2212. 'previousSlide': previousSlide,
  2213. 'currentSlide': currentSlide,
  2214. 'origin': o
  2215. } );
  2216. }
  2217. // Handle embedded content
  2218. if( slideChanged || !previousSlide ) {
  2219. stopEmbeddedContent( previousSlide );
  2220. startEmbeddedContent( currentSlide );
  2221. }
  2222. // Announce the current slide contents, for screen readers
  2223. dom.statusDiv.textContent = getStatusText( currentSlide );
  2224. updateControls();
  2225. updateProgress();
  2226. updateBackground();
  2227. updateParallax();
  2228. updateSlideNumber();
  2229. updateNotes();
  2230. updateFragments();
  2231. // Update the URL hash
  2232. writeURL();
  2233. cueAutoSlide();
  2234. }
  2235. /**
  2236. * Syncs the presentation with the current DOM. Useful
  2237. * when new slides or control elements are added or when
  2238. * the configuration has changed.
  2239. */
  2240. function sync() {
  2241. // Subscribe to input
  2242. removeEventListeners();
  2243. addEventListeners();
  2244. // Force a layout to make sure the current config is accounted for
  2245. layout();
  2246. // Reflect the current autoSlide value
  2247. autoSlide = config.autoSlide;
  2248. // Start auto-sliding if it's enabled
  2249. cueAutoSlide();
  2250. // Re-create the slide backgrounds
  2251. createBackgrounds();
  2252. // Write the current hash to the URL
  2253. writeURL();
  2254. sortAllFragments();
  2255. updateControls();
  2256. updateProgress();
  2257. updateSlideNumber();
  2258. updateSlidesVisibility();
  2259. updateBackground( true );
  2260. updateNotesVisibility();
  2261. updateNotes();
  2262. formatEmbeddedContent();
  2263. // Start or stop embedded content depending on global config
  2264. if( config.autoPlayMedia === false ) {
  2265. stopEmbeddedContent( currentSlide, { unloadIframes: false } );
  2266. }
  2267. else {
  2268. startEmbeddedContent( currentSlide );
  2269. }
  2270. if( isOverview() ) {
  2271. layoutOverview();
  2272. }
  2273. }
  2274. /**
  2275. * Updates reveal.js to keep in sync with new slide attributes. For
  2276. * example, if you add a new `data-background-image` you can call
  2277. * this to have reveal.js render the new background image.
  2278. *
  2279. * Similar to #sync() but more efficient when you only need to
  2280. * refresh a specific slide.
  2281. *
  2282. * @param {HTMLElement} slide
  2283. */
  2284. function syncSlide( slide ) {
  2285. syncBackground( slide );
  2286. syncFragments( slide );
  2287. updateBackground();
  2288. updateNotes();
  2289. loadSlide( slide );
  2290. }
  2291. /**
  2292. * Formats the fragments on the given slide so that they have
  2293. * valid indices. Call this if fragments are changed in the DOM
  2294. * after reveal.js has already initialized.
  2295. *
  2296. * @param {HTMLElement} slide
  2297. */
  2298. function syncFragments( slide ) {
  2299. sortFragments( slide.querySelectorAll( '.fragment' ) );
  2300. }
  2301. /**
  2302. * Resets all vertical slides so that only the first
  2303. * is visible.
  2304. */
  2305. function resetVerticalSlides() {
  2306. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2307. horizontalSlides.forEach( function( horizontalSlide ) {
  2308. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2309. verticalSlides.forEach( function( verticalSlide, y ) {
  2310. if( y > 0 ) {
  2311. verticalSlide.classList.remove( 'present' );
  2312. verticalSlide.classList.remove( 'past' );
  2313. verticalSlide.classList.add( 'future' );
  2314. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  2315. }
  2316. } );
  2317. } );
  2318. }
  2319. /**
  2320. * Sorts and formats all of fragments in the
  2321. * presentation.
  2322. */
  2323. function sortAllFragments() {
  2324. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2325. horizontalSlides.forEach( function( horizontalSlide ) {
  2326. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2327. verticalSlides.forEach( function( verticalSlide, y ) {
  2328. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  2329. } );
  2330. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  2331. } );
  2332. }
  2333. /**
  2334. * Randomly shuffles all slides in the deck.
  2335. */
  2336. function shuffle() {
  2337. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2338. slides.forEach( function( slide ) {
  2339. // Insert this slide next to another random slide. This may
  2340. // cause the slide to insert before itself but that's fine.
  2341. dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
  2342. } );
  2343. }
  2344. /**
  2345. * Updates one dimension of slides by showing the slide
  2346. * with the specified index.
  2347. *
  2348. * @param {string} selector A CSS selector that will fetch
  2349. * the group of slides we are working with
  2350. * @param {number} index The index of the slide that should be
  2351. * shown
  2352. *
  2353. * @return {number} The index of the slide that is now shown,
  2354. * might differ from the passed in index if it was out of
  2355. * bounds.
  2356. */
  2357. function updateSlides( selector, index ) {
  2358. // Select all slides and convert the NodeList result to
  2359. // an array
  2360. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  2361. slidesLength = slides.length;
  2362. var printMode = isPrintingPDF();
  2363. if( slidesLength ) {
  2364. // Should the index loop?
  2365. if( config.loop ) {
  2366. index %= slidesLength;
  2367. if( index < 0 ) {
  2368. index = slidesLength + index;
  2369. }
  2370. }
  2371. // Enforce max and minimum index bounds
  2372. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  2373. for( var i = 0; i < slidesLength; i++ ) {
  2374. var element = slides[i];
  2375. var reverse = config.rtl && !isVerticalSlide( element );
  2376. element.classList.remove( 'past' );
  2377. element.classList.remove( 'present' );
  2378. element.classList.remove( 'future' );
  2379. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  2380. element.setAttribute( 'hidden', '' );
  2381. element.setAttribute( 'aria-hidden', 'true' );
  2382. // If this element contains vertical slides
  2383. if( element.querySelector( 'section' ) ) {
  2384. element.classList.add( 'stack' );
  2385. }
  2386. // If we're printing static slides, all slides are "present"
  2387. if( printMode ) {
  2388. element.classList.add( 'present' );
  2389. continue;
  2390. }
  2391. if( i < index ) {
  2392. // Any element previous to index is given the 'past' class
  2393. element.classList.add( reverse ? 'future' : 'past' );
  2394. if( config.fragments ) {
  2395. // Show all fragments in prior slides
  2396. toArray( element.querySelectorAll( '.fragment' ) ).forEach( function( fragment ) {
  2397. fragment.classList.add( 'visible' );
  2398. fragment.classList.remove( 'current-fragment' );
  2399. } );
  2400. }
  2401. }
  2402. else if( i > index ) {
  2403. // Any element subsequent to index is given the 'future' class
  2404. element.classList.add( reverse ? 'past' : 'future' );
  2405. if( config.fragments ) {
  2406. // Hide all fragments in future slides
  2407. toArray( element.querySelectorAll( '.fragment.visible' ) ).forEach( function( fragment ) {
  2408. fragment.classList.remove( 'visible' );
  2409. fragment.classList.remove( 'current-fragment' );
  2410. } );
  2411. }
  2412. }
  2413. }
  2414. // Mark the current slide as present
  2415. slides[index].classList.add( 'present' );
  2416. slides[index].removeAttribute( 'hidden' );
  2417. slides[index].removeAttribute( 'aria-hidden' );
  2418. // If this slide has a state associated with it, add it
  2419. // onto the current state of the deck
  2420. var slideState = slides[index].getAttribute( 'data-state' );
  2421. if( slideState ) {
  2422. state = state.concat( slideState.split( ' ' ) );
  2423. }
  2424. }
  2425. else {
  2426. // Since there are no slides we can't be anywhere beyond the
  2427. // zeroth index
  2428. index = 0;
  2429. }
  2430. return index;
  2431. }
  2432. /**
  2433. * Optimization method; hide all slides that are far away
  2434. * from the present slide.
  2435. */
  2436. function updateSlidesVisibility() {
  2437. // Select all slides and convert the NodeList result to
  2438. // an array
  2439. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  2440. horizontalSlidesLength = horizontalSlides.length,
  2441. distanceX,
  2442. distanceY;
  2443. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  2444. // The number of steps away from the present slide that will
  2445. // be visible
  2446. var viewDistance = isOverview() ? 10 : config.viewDistance;
  2447. // Limit view distance on weaker devices
  2448. if( isMobileDevice ) {
  2449. viewDistance = isOverview() ? 6 : 2;
  2450. }
  2451. // All slides need to be visible when exporting to PDF
  2452. if( isPrintingPDF() ) {
  2453. viewDistance = Number.MAX_VALUE;
  2454. }
  2455. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  2456. var horizontalSlide = horizontalSlides[x];
  2457. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  2458. verticalSlidesLength = verticalSlides.length;
  2459. // Determine how far away this slide is from the present
  2460. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  2461. // If the presentation is looped, distance should measure
  2462. // 1 between the first and last slides
  2463. if( config.loop ) {
  2464. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  2465. }
  2466. // Show the horizontal slide if it's within the view distance
  2467. if( distanceX < viewDistance ) {
  2468. loadSlide( horizontalSlide );
  2469. }
  2470. else {
  2471. unloadSlide( horizontalSlide );
  2472. }
  2473. if( verticalSlidesLength ) {
  2474. var oy = getPreviousVerticalIndex( horizontalSlide );
  2475. for( var y = 0; y < verticalSlidesLength; y++ ) {
  2476. var verticalSlide = verticalSlides[y];
  2477. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  2478. if( distanceX + distanceY < viewDistance ) {
  2479. loadSlide( verticalSlide );
  2480. }
  2481. else {
  2482. unloadSlide( verticalSlide );
  2483. }
  2484. }
  2485. }
  2486. }
  2487. // Flag if there are ANY vertical slides, anywhere in the deck
  2488. if( dom.wrapper.querySelectorAll( '.slides>section>section' ).length ) {
  2489. dom.wrapper.classList.add( 'has-vertical-slides' );
  2490. }
  2491. else {
  2492. dom.wrapper.classList.remove( 'has-vertical-slides' );
  2493. }
  2494. // Flag if there are ANY horizontal slides, anywhere in the deck
  2495. if( dom.wrapper.querySelectorAll( '.slides>section' ).length > 1 ) {
  2496. dom.wrapper.classList.add( 'has-horizontal-slides' );
  2497. }
  2498. else {
  2499. dom.wrapper.classList.remove( 'has-horizontal-slides' );
  2500. }
  2501. }
  2502. }
  2503. /**
  2504. * Pick up notes from the current slide and display them
  2505. * to the viewer.
  2506. *
  2507. * @see {@link config.showNotes}
  2508. */
  2509. function updateNotes() {
  2510. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  2511. dom.speakerNotes.innerHTML = getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
  2512. }
  2513. }
  2514. /**
  2515. * Updates the visibility of the speaker notes sidebar that
  2516. * is used to share annotated slides. The notes sidebar is
  2517. * only visible if showNotes is true and there are notes on
  2518. * one or more slides in the deck.
  2519. */
  2520. function updateNotesVisibility() {
  2521. if( config.showNotes && hasNotes() ) {
  2522. dom.wrapper.classList.add( 'show-notes' );
  2523. }
  2524. else {
  2525. dom.wrapper.classList.remove( 'show-notes' );
  2526. }
  2527. }
  2528. /**
  2529. * Checks if there are speaker notes for ANY slide in the
  2530. * presentation.
  2531. */
  2532. function hasNotes() {
  2533. return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0;
  2534. }
  2535. /**
  2536. * Updates the progress bar to reflect the current slide.
  2537. */
  2538. function updateProgress() {
  2539. // Update progress if enabled
  2540. if( config.progress && dom.progressbar ) {
  2541. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  2542. }
  2543. }
  2544. /**
  2545. * Updates the slide number to match the current slide.
  2546. */
  2547. function updateSlideNumber() {
  2548. // Update slide number if enabled
  2549. if( config.slideNumber && dom.slideNumber ) {
  2550. var value;
  2551. var format = 'h.v';
  2552. if( typeof config.slideNumber === 'function' ) {
  2553. value = config.slideNumber();
  2554. }
  2555. else {
  2556. // Check if a custom number format is available
  2557. if( typeof config.slideNumber === 'string' ) {
  2558. format = config.slideNumber;
  2559. }
  2560. // If there are ONLY vertical slides in this deck, always use
  2561. // a flattened slide number
  2562. if( !/c/.test( format ) && dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length === 1 ) {
  2563. format = 'c';
  2564. }
  2565. value = [];
  2566. switch( format ) {
  2567. case 'c':
  2568. value.push( getSlidePastCount() + 1 );
  2569. break;
  2570. case 'c/t':
  2571. value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
  2572. break;
  2573. case 'h/v':
  2574. value.push( indexh + 1 );
  2575. if( isVerticalSlide() ) value.push( '/', indexv + 1 );
  2576. break;
  2577. default:
  2578. value.push( indexh + 1 );
  2579. if( isVerticalSlide() ) value.push( '.', indexv + 1 );
  2580. }
  2581. }
  2582. dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
  2583. }
  2584. }
  2585. /**
  2586. * Applies HTML formatting to a slide number before it's
  2587. * written to the DOM.
  2588. *
  2589. * @param {number} a Current slide
  2590. * @param {string} delimiter Character to separate slide numbers
  2591. * @param {(number|*)} b Total slides
  2592. * @return {string} HTML string fragment
  2593. */
  2594. function formatSlideNumber( a, delimiter, b ) {
  2595. var url = '#' + locationHash();
  2596. if( typeof b === 'number' && !isNaN( b ) ) {
  2597. return '<a href="' + url + '">' +
  2598. '<span class="slide-number-a">'+ a +'</span>' +
  2599. '<span class="slide-number-delimiter">'+ delimiter +'</span>' +
  2600. '<span class="slide-number-b">'+ b +'</span>' +
  2601. '</a>';
  2602. }
  2603. else {
  2604. return '<a href="' + url + '">' +
  2605. '<span class="slide-number-a">'+ a +'</span>' +
  2606. '</a>';
  2607. }
  2608. }
  2609. /**
  2610. * Updates the state of all control/navigation arrows.
  2611. */
  2612. function updateControls() {
  2613. var routes = availableRoutes();
  2614. var fragments = availableFragments();
  2615. // Remove the 'enabled' class from all directions
  2616. dom.controlsLeft.concat( dom.controlsRight )
  2617. .concat( dom.controlsUp )
  2618. .concat( dom.controlsDown )
  2619. .concat( dom.controlsPrev )
  2620. .concat( dom.controlsNext ).forEach( function( node ) {
  2621. node.classList.remove( 'enabled' );
  2622. node.classList.remove( 'fragmented' );
  2623. // Set 'disabled' attribute on all directions
  2624. node.setAttribute( 'disabled', 'disabled' );
  2625. } );
  2626. // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
  2627. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2628. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2629. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2630. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2631. // Prev/next buttons
  2632. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2633. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2634. // Highlight fragment directions
  2635. if( currentSlide ) {
  2636. // Always apply fragment decorator to prev/next buttons
  2637. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2638. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2639. // Apply fragment decorators to directional buttons based on
  2640. // what slide axis they are in
  2641. if( isVerticalSlide( currentSlide ) ) {
  2642. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2643. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2644. }
  2645. else {
  2646. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2647. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2648. }
  2649. }
  2650. if( config.controlsTutorial ) {
  2651. // Highlight control arrows with an animation to ensure
  2652. // that the viewer knows how to navigate
  2653. if( !hasNavigatedDown && routes.down ) {
  2654. dom.controlsDownArrow.classList.add( 'highlight' );
  2655. }
  2656. else {
  2657. dom.controlsDownArrow.classList.remove( 'highlight' );
  2658. if( !hasNavigatedRight && routes.right && indexv === 0 ) {
  2659. dom.controlsRightArrow.classList.add( 'highlight' );
  2660. }
  2661. else {
  2662. dom.controlsRightArrow.classList.remove( 'highlight' );
  2663. }
  2664. }
  2665. }
  2666. }
  2667. /**
  2668. * Updates the background elements to reflect the current
  2669. * slide.
  2670. *
  2671. * @param {boolean} includeAll If true, the backgrounds of
  2672. * all vertical slides (not just the present) will be updated.
  2673. */
  2674. function updateBackground( includeAll ) {
  2675. var currentBackground = null;
  2676. // Reverse past/future classes when in RTL mode
  2677. var horizontalPast = config.rtl ? 'future' : 'past',
  2678. horizontalFuture = config.rtl ? 'past' : 'future';
  2679. // Update the classes of all backgrounds to match the
  2680. // states of their slides (past/present/future)
  2681. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2682. backgroundh.classList.remove( 'past' );
  2683. backgroundh.classList.remove( 'present' );
  2684. backgroundh.classList.remove( 'future' );
  2685. if( h < indexh ) {
  2686. backgroundh.classList.add( horizontalPast );
  2687. }
  2688. else if ( h > indexh ) {
  2689. backgroundh.classList.add( horizontalFuture );
  2690. }
  2691. else {
  2692. backgroundh.classList.add( 'present' );
  2693. // Store a reference to the current background element
  2694. currentBackground = backgroundh;
  2695. }
  2696. if( includeAll || h === indexh ) {
  2697. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2698. backgroundv.classList.remove( 'past' );
  2699. backgroundv.classList.remove( 'present' );
  2700. backgroundv.classList.remove( 'future' );
  2701. if( v < indexv ) {
  2702. backgroundv.classList.add( 'past' );
  2703. }
  2704. else if ( v > indexv ) {
  2705. backgroundv.classList.add( 'future' );
  2706. }
  2707. else {
  2708. backgroundv.classList.add( 'present' );
  2709. // Only if this is the present horizontal and vertical slide
  2710. if( h === indexh ) currentBackground = backgroundv;
  2711. }
  2712. } );
  2713. }
  2714. } );
  2715. // Stop content inside of previous backgrounds
  2716. if( previousBackground ) {
  2717. stopEmbeddedContent( previousBackground );
  2718. }
  2719. // Start content in the current background
  2720. if( currentBackground ) {
  2721. startEmbeddedContent( currentBackground );
  2722. var currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
  2723. if( currentBackgroundContent ) {
  2724. var backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';
  2725. // Restart GIFs (doesn't work in Firefox)
  2726. if( /\.gif/i.test( backgroundImageURL ) ) {
  2727. currentBackgroundContent.style.backgroundImage = '';
  2728. window.getComputedStyle( currentBackgroundContent ).opacity;
  2729. currentBackgroundContent.style.backgroundImage = backgroundImageURL;
  2730. }
  2731. }
  2732. // Don't transition between identical backgrounds. This
  2733. // prevents unwanted flicker.
  2734. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2735. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2736. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2737. dom.background.classList.add( 'no-transition' );
  2738. }
  2739. previousBackground = currentBackground;
  2740. }
  2741. // If there's a background brightness flag for this slide,
  2742. // bubble it to the .reveal container
  2743. if( currentSlide ) {
  2744. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2745. if( currentSlide.classList.contains( classToBubble ) ) {
  2746. dom.wrapper.classList.add( classToBubble );
  2747. }
  2748. else {
  2749. dom.wrapper.classList.remove( classToBubble );
  2750. }
  2751. } );
  2752. }
  2753. // Allow the first background to apply without transition
  2754. setTimeout( function() {
  2755. dom.background.classList.remove( 'no-transition' );
  2756. }, 1 );
  2757. }
  2758. /**
  2759. * Updates the position of the parallax background based
  2760. * on the current slide index.
  2761. */
  2762. function updateParallax() {
  2763. if( config.parallaxBackgroundImage ) {
  2764. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2765. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2766. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2767. backgroundWidth, backgroundHeight;
  2768. if( backgroundSize.length === 1 ) {
  2769. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2770. }
  2771. else {
  2772. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2773. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2774. }
  2775. var slideWidth = dom.background.offsetWidth,
  2776. horizontalSlideCount = horizontalSlides.length,
  2777. horizontalOffsetMultiplier,
  2778. horizontalOffset;
  2779. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2780. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2781. }
  2782. else {
  2783. horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
  2784. }
  2785. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2786. var slideHeight = dom.background.offsetHeight,
  2787. verticalSlideCount = verticalSlides.length,
  2788. verticalOffsetMultiplier,
  2789. verticalOffset;
  2790. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2791. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2792. }
  2793. else {
  2794. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2795. }
  2796. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0;
  2797. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2798. }
  2799. }
  2800. /**
  2801. * Called when the given slide is within the configured view
  2802. * distance. Shows the slide element and loads any content
  2803. * that is set to load lazily (data-src).
  2804. *
  2805. * @param {HTMLElement} slide Slide to show
  2806. */
  2807. function loadSlide( slide, options ) {
  2808. options = options || {};
  2809. // Show the slide element
  2810. slide.style.display = config.display;
  2811. // Media elements with data-src attributes
  2812. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) {
  2813. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2814. element.setAttribute( 'data-lazy-loaded', '' );
  2815. element.removeAttribute( 'data-src' );
  2816. } );
  2817. // Media elements with <source> children
  2818. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2819. var sources = 0;
  2820. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2821. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2822. source.removeAttribute( 'data-src' );
  2823. source.setAttribute( 'data-lazy-loaded', '' );
  2824. sources += 1;
  2825. } );
  2826. // If we rewrote sources for this video/audio element, we need
  2827. // to manually tell it to load from its new origin
  2828. if( sources > 0 ) {
  2829. media.load();
  2830. }
  2831. } );
  2832. // Show the corresponding background element
  2833. var background = slide.slideBackgroundElement;
  2834. if( background ) {
  2835. background.style.display = 'block';
  2836. var backgroundContent = slide.slideBackgroundContentElement;
  2837. // If the background contains media, load it
  2838. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2839. background.setAttribute( 'data-loaded', 'true' );
  2840. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2841. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2842. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2843. backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ),
  2844. backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2845. // Images
  2846. if( backgroundImage ) {
  2847. backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')';
  2848. }
  2849. // Videos
  2850. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2851. var video = document.createElement( 'video' );
  2852. if( backgroundVideoLoop ) {
  2853. video.setAttribute( 'loop', '' );
  2854. }
  2855. if( backgroundVideoMuted ) {
  2856. video.muted = true;
  2857. }
  2858. // Inline video playback works (at least in Mobile Safari) as
  2859. // long as the video is muted and the `playsinline` attribute is
  2860. // present
  2861. if( isMobileDevice ) {
  2862. video.muted = true;
  2863. video.autoplay = true;
  2864. video.setAttribute( 'playsinline', '' );
  2865. }
  2866. // Support comma separated lists of video sources
  2867. backgroundVideo.split( ',' ).forEach( function( source ) {
  2868. video.innerHTML += '<source src="'+ source +'">';
  2869. } );
  2870. backgroundContent.appendChild( video );
  2871. }
  2872. // Iframes
  2873. else if( backgroundIframe && options.excludeIframes !== true ) {
  2874. var iframe = document.createElement( 'iframe' );
  2875. iframe.setAttribute( 'allowfullscreen', '' );
  2876. iframe.setAttribute( 'mozallowfullscreen', '' );
  2877. iframe.setAttribute( 'webkitallowfullscreen', '' );
  2878. // Only load autoplaying content when the slide is shown to
  2879. // avoid having it play in the background
  2880. if( /autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
  2881. iframe.setAttribute( 'data-src', backgroundIframe );
  2882. }
  2883. else {
  2884. iframe.setAttribute( 'src', backgroundIframe );
  2885. }
  2886. iframe.style.width = '100%';
  2887. iframe.style.height = '100%';
  2888. iframe.style.maxHeight = '100%';
  2889. iframe.style.maxWidth = '100%';
  2890. backgroundContent.appendChild( iframe );
  2891. }
  2892. }
  2893. }
  2894. }
  2895. /**
  2896. * Unloads and hides the given slide. This is called when the
  2897. * slide is moved outside of the configured view distance.
  2898. *
  2899. * @param {HTMLElement} slide
  2900. */
  2901. function unloadSlide( slide ) {
  2902. // Hide the slide element
  2903. slide.style.display = 'none';
  2904. // Hide the corresponding background element
  2905. var background = getSlideBackground( slide );
  2906. if( background ) {
  2907. background.style.display = 'none';
  2908. }
  2909. // Reset lazy-loaded media elements with src attributes
  2910. toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src]' ) ).forEach( function( element ) {
  2911. element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
  2912. element.removeAttribute( 'src' );
  2913. } );
  2914. // Reset lazy-loaded media elements with <source> children
  2915. toArray( slide.querySelectorAll( 'video[data-lazy-loaded] source[src], audio source[src]' ) ).forEach( function( source ) {
  2916. source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
  2917. source.removeAttribute( 'src' );
  2918. } );
  2919. }
  2920. /**
  2921. * Determine what available routes there are for navigation.
  2922. *
  2923. * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
  2924. */
  2925. function availableRoutes() {
  2926. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2927. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2928. var routes = {
  2929. left: indexh > 0,
  2930. right: indexh < horizontalSlides.length - 1,
  2931. up: indexv > 0,
  2932. down: indexv < verticalSlides.length - 1
  2933. };
  2934. // Looped presentations can always be navigated as long as
  2935. // there are slides available
  2936. if( config.loop ) {
  2937. if( horizontalSlides.length > 1 ) {
  2938. routes.left = true;
  2939. routes.right = true;
  2940. }
  2941. if( verticalSlides.length > 1 ) {
  2942. routes.up = true;
  2943. routes.down = true;
  2944. }
  2945. }
  2946. // Reverse horizontal controls for rtl
  2947. if( config.rtl ) {
  2948. var left = routes.left;
  2949. routes.left = routes.right;
  2950. routes.right = left;
  2951. }
  2952. return routes;
  2953. }
  2954. /**
  2955. * Returns an object describing the available fragment
  2956. * directions.
  2957. *
  2958. * @return {{prev: boolean, next: boolean}}
  2959. */
  2960. function availableFragments() {
  2961. if( currentSlide && config.fragments ) {
  2962. var fragments = currentSlide.querySelectorAll( '.fragment' );
  2963. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  2964. return {
  2965. prev: fragments.length - hiddenFragments.length > 0,
  2966. next: !!hiddenFragments.length
  2967. };
  2968. }
  2969. else {
  2970. return { prev: false, next: false };
  2971. }
  2972. }
  2973. /**
  2974. * Enforces origin-specific format rules for embedded media.
  2975. */
  2976. function formatEmbeddedContent() {
  2977. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  2978. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  2979. var src = el.getAttribute( sourceAttribute );
  2980. if( src && src.indexOf( param ) === -1 ) {
  2981. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  2982. }
  2983. });
  2984. };
  2985. // YouTube frames must include "?enablejsapi=1"
  2986. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  2987. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  2988. // Vimeo frames must include "?api=1"
  2989. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  2990. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  2991. }
  2992. /**
  2993. * Start playback of any embedded content inside of
  2994. * the given element.
  2995. *
  2996. * @param {HTMLElement} element
  2997. */
  2998. function startEmbeddedContent( element ) {
  2999. if( element && !isSpeakerNotes() ) {
  3000. // Restart GIFs
  3001. toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  3002. // Setting the same unchanged source like this was confirmed
  3003. // to work in Chrome, FF & Safari
  3004. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  3005. } );
  3006. // HTML5 media elements
  3007. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3008. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3009. return;
  3010. }
  3011. // Prefer an explicit global autoplay setting
  3012. var autoplay = config.autoPlayMedia;
  3013. // If no global setting is available, fall back on the element's
  3014. // own autoplay setting
  3015. if( typeof autoplay !== 'boolean' ) {
  3016. autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' );
  3017. }
  3018. if( autoplay && typeof el.play === 'function' ) {
  3019. // If the media is ready, start playback
  3020. if( el.readyState > 1 ) {
  3021. startEmbeddedMedia( { target: el } );
  3022. }
  3023. // Mobile devices never fire a loaded event so instead
  3024. // of waiting, we initiate playback
  3025. else if( isMobileDevice ) {
  3026. var promise = el.play();
  3027. // If autoplay does not work, ensure that the controls are visible so
  3028. // that the viewer can start the media on their own
  3029. if( promise && typeof promise.catch === 'function' && el.controls === false ) {
  3030. promise.catch( function() {
  3031. el.controls = true;
  3032. // Once the video does start playing, hide the controls again
  3033. el.addEventListener( 'play', function() {
  3034. el.controls = false;
  3035. } );
  3036. } );
  3037. }
  3038. }
  3039. // If the media isn't loaded, wait before playing
  3040. else {
  3041. el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes
  3042. el.addEventListener( 'loadeddata', startEmbeddedMedia );
  3043. }
  3044. }
  3045. } );
  3046. // Normal iframes
  3047. toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  3048. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3049. return;
  3050. }
  3051. startEmbeddedIframe( { target: el } );
  3052. } );
  3053. // Lazy loading iframes
  3054. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3055. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  3056. return;
  3057. }
  3058. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  3059. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  3060. el.addEventListener( 'load', startEmbeddedIframe );
  3061. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  3062. }
  3063. } );
  3064. }
  3065. }
  3066. /**
  3067. * Starts playing an embedded video/audio element after
  3068. * it has finished loading.
  3069. *
  3070. * @param {object} event
  3071. */
  3072. function startEmbeddedMedia( event ) {
  3073. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3074. isVisible = !!closestParent( event.target, '.present' );
  3075. if( isAttachedToDOM && isVisible ) {
  3076. event.target.currentTime = 0;
  3077. event.target.play();
  3078. }
  3079. event.target.removeEventListener( 'loadeddata', startEmbeddedMedia );
  3080. }
  3081. /**
  3082. * "Starts" the content of an embedded iframe using the
  3083. * postMessage API.
  3084. *
  3085. * @param {object} event
  3086. */
  3087. function startEmbeddedIframe( event ) {
  3088. var iframe = event.target;
  3089. if( iframe && iframe.contentWindow ) {
  3090. var isAttachedToDOM = !!closestParent( event.target, 'html' ),
  3091. isVisible = !!closestParent( event.target, '.present' );
  3092. if( isAttachedToDOM && isVisible ) {
  3093. // Prefer an explicit global autoplay setting
  3094. var autoplay = config.autoPlayMedia;
  3095. // If no global setting is available, fall back on the element's
  3096. // own autoplay setting
  3097. if( typeof autoplay !== 'boolean' ) {
  3098. autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' );
  3099. }
  3100. // YouTube postMessage API
  3101. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3102. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  3103. }
  3104. // Vimeo postMessage API
  3105. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {
  3106. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  3107. }
  3108. // Generic postMessage API
  3109. else {
  3110. iframe.contentWindow.postMessage( 'slide:start', '*' );
  3111. }
  3112. }
  3113. }
  3114. }
  3115. /**
  3116. * Stop playback of any embedded content inside of
  3117. * the targeted slide.
  3118. *
  3119. * @param {HTMLElement} element
  3120. */
  3121. function stopEmbeddedContent( element, options ) {
  3122. options = extend( {
  3123. // Defaults
  3124. unloadIframes: true
  3125. }, options || {} );
  3126. if( element && element.parentNode ) {
  3127. // HTML5 media elements
  3128. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3129. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  3130. el.setAttribute('data-paused-by-reveal', '');
  3131. el.pause();
  3132. }
  3133. } );
  3134. // Generic postMessage API for non-lazy loaded iframes
  3135. toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  3136. if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
  3137. el.removeEventListener( 'load', startEmbeddedIframe );
  3138. });
  3139. // YouTube postMessage API
  3140. toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  3141. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3142. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  3143. }
  3144. });
  3145. // Vimeo postMessage API
  3146. toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  3147. if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
  3148. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  3149. }
  3150. });
  3151. if( options.unloadIframes === true ) {
  3152. // Unload lazy-loaded iframes
  3153. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  3154. // Only removing the src doesn't actually unload the frame
  3155. // in all browsers (Firefox) so we set it to blank first
  3156. el.setAttribute( 'src', 'about:blank' );
  3157. el.removeAttribute( 'src' );
  3158. } );
  3159. }
  3160. }
  3161. }
  3162. /**
  3163. * Returns the number of past slides. This can be used as a global
  3164. * flattened index for slides.
  3165. *
  3166. * @return {number} Past slide count
  3167. */
  3168. function getSlidePastCount() {
  3169. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3170. // The number of past slides
  3171. var pastCount = 0;
  3172. // Step through all slides and count the past ones
  3173. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  3174. var horizontalSlide = horizontalSlides[i];
  3175. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  3176. for( var j = 0; j < verticalSlides.length; j++ ) {
  3177. // Stop as soon as we arrive at the present
  3178. if( verticalSlides[j].classList.contains( 'present' ) ) {
  3179. break mainLoop;
  3180. }
  3181. pastCount++;
  3182. }
  3183. // Stop as soon as we arrive at the present
  3184. if( horizontalSlide.classList.contains( 'present' ) ) {
  3185. break;
  3186. }
  3187. // Don't count the wrapping section for vertical slides
  3188. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  3189. pastCount++;
  3190. }
  3191. }
  3192. return pastCount;
  3193. }
  3194. /**
  3195. * Returns a value ranging from 0-1 that represents
  3196. * how far into the presentation we have navigated.
  3197. *
  3198. * @return {number}
  3199. */
  3200. function getProgress() {
  3201. // The number of past and total slides
  3202. var totalCount = getTotalSlides();
  3203. var pastCount = getSlidePastCount();
  3204. if( currentSlide ) {
  3205. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  3206. // If there are fragments in the current slide those should be
  3207. // accounted for in the progress.
  3208. if( allFragments.length > 0 ) {
  3209. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  3210. // This value represents how big a portion of the slide progress
  3211. // that is made up by its fragments (0-1)
  3212. var fragmentWeight = 0.9;
  3213. // Add fragment progress to the past slide count
  3214. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  3215. }
  3216. }
  3217. return pastCount / ( totalCount - 1 );
  3218. }
  3219. /**
  3220. * Checks if this presentation is running inside of the
  3221. * speaker notes window.
  3222. *
  3223. * @return {boolean}
  3224. */
  3225. function isSpeakerNotes() {
  3226. return !!window.location.search.match( /receiver/gi );
  3227. }
  3228. /**
  3229. * Reads the current URL (hash) and navigates accordingly.
  3230. */
  3231. function readURL() {
  3232. var hash = window.location.hash;
  3233. // Attempt to parse the hash as either an index or name
  3234. var bits = hash.slice( 2 ).split( '/' ),
  3235. name = hash.replace( /#|\//gi, '' );
  3236. // If the first bit is not fully numeric and there is a name we
  3237. // can assume that this is a named link
  3238. if( !/^[0-9]*$/.test( bits[0] ) && name.length ) {
  3239. var element;
  3240. // Ensure the named link is a valid HTML ID attribute
  3241. try {
  3242. element = document.getElementById( decodeURIComponent( name ) );
  3243. }
  3244. catch ( error ) { }
  3245. // Ensure that we're not already on a slide with the same name
  3246. var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
  3247. if( element ) {
  3248. // If the slide exists and is not the current slide...
  3249. if ( !isSameNameAsCurrentSlide ) {
  3250. // ...find the position of the named slide and navigate to it
  3251. var indices = Reveal.getIndices(element);
  3252. slide(indices.h, indices.v);
  3253. }
  3254. }
  3255. // If the slide doesn't exist, navigate to the current slide
  3256. else {
  3257. slide( indexh || 0, indexv || 0 );
  3258. }
  3259. }
  3260. else {
  3261. var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
  3262. // Read the index components of the hash
  3263. var h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,
  3264. v = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,
  3265. f;
  3266. if( config.fragmentInURL ) {
  3267. f = parseInt( bits[2], 10 );
  3268. if( isNaN( f ) ) {
  3269. f = undefined;
  3270. }
  3271. }
  3272. if( h !== indexh || v !== indexv || f !== undefined ) {
  3273. slide( h, v, f );
  3274. }
  3275. }
  3276. }
  3277. /**
  3278. * Updates the page URL (hash) to reflect the current
  3279. * state.
  3280. *
  3281. * @param {number} delay The time in ms to wait before
  3282. * writing the hash
  3283. */
  3284. function writeURL( delay ) {
  3285. // Make sure there's never more than one timeout running
  3286. clearTimeout( writeURLTimeout );
  3287. // If a delay is specified, timeout this call
  3288. if( typeof delay === 'number' ) {
  3289. writeURLTimeout = setTimeout( writeURL, delay );
  3290. }
  3291. else if( currentSlide ) {
  3292. if( config.history || !window.history ) {
  3293. window.location.hash = locationHash();
  3294. }
  3295. else if( config.hash ) {
  3296. window.history.replaceState(null, null, '#' + locationHash());
  3297. }
  3298. }
  3299. }
  3300. /**
  3301. * Retrieves the h/v location and fragment of the current,
  3302. * or specified, slide.
  3303. *
  3304. * @param {HTMLElement} [slide] If specified, the returned
  3305. * index will be for this slide rather than the currently
  3306. * active one
  3307. *
  3308. * @return {{h: number, v: number, f: number}}
  3309. */
  3310. function getIndices( slide ) {
  3311. // By default, return the current indices
  3312. var h = indexh,
  3313. v = indexv,
  3314. f;
  3315. // If a slide is specified, return the indices of that slide
  3316. if( slide ) {
  3317. var isVertical = isVerticalSlide( slide );
  3318. var slideh = isVertical ? slide.parentNode : slide;
  3319. // Select all horizontal slides
  3320. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  3321. // Now that we know which the horizontal slide is, get its index
  3322. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  3323. // Assume we're not vertical
  3324. v = undefined;
  3325. // If this is a vertical slide, grab the vertical index
  3326. if( isVertical ) {
  3327. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  3328. }
  3329. }
  3330. if( !slide && currentSlide ) {
  3331. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  3332. if( hasFragments ) {
  3333. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  3334. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  3335. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  3336. }
  3337. else {
  3338. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  3339. }
  3340. }
  3341. }
  3342. return { h: h, v: v, f: f };
  3343. }
  3344. /**
  3345. * Retrieves all slides in this presentation.
  3346. */
  3347. function getSlides() {
  3348. return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ));
  3349. }
  3350. /**
  3351. * Returns an array of objects where each object represents the
  3352. * attributes on its respective slide.
  3353. */
  3354. function getSlidesAttributes() {
  3355. return getSlides().map( function( slide ) {
  3356. var attributes = {};
  3357. for( var i = 0; i < slide.attributes.length; i++ ) {
  3358. var attribute = slide.attributes[ i ];
  3359. attributes[ attribute.name ] = attribute.value;
  3360. }
  3361. return attributes;
  3362. } );
  3363. }
  3364. /**
  3365. * Retrieves the total number of slides in this presentation.
  3366. *
  3367. * @return {number}
  3368. */
  3369. function getTotalSlides() {
  3370. return getSlides().length;
  3371. }
  3372. /**
  3373. * Returns the slide element matching the specified index.
  3374. *
  3375. * @return {HTMLElement}
  3376. */
  3377. function getSlide( x, y ) {
  3378. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  3379. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  3380. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  3381. return verticalSlides ? verticalSlides[ y ] : undefined;
  3382. }
  3383. return horizontalSlide;
  3384. }
  3385. /**
  3386. * Returns the background element for the given slide.
  3387. * All slides, even the ones with no background properties
  3388. * defined, have a background element so as long as the
  3389. * index is valid an element will be returned.
  3390. *
  3391. * @param {mixed} x Horizontal background index OR a slide
  3392. * HTML element
  3393. * @param {number} y Vertical background index
  3394. * @return {(HTMLElement[]|*)}
  3395. */
  3396. function getSlideBackground( x, y ) {
  3397. var slide = typeof x === 'number' ? getSlide( x, y ) : x;
  3398. if( slide ) {
  3399. return slide.slideBackgroundElement;
  3400. }
  3401. return undefined;
  3402. }
  3403. /**
  3404. * Retrieves the speaker notes from a slide. Notes can be
  3405. * defined in two ways:
  3406. * 1. As a data-notes attribute on the slide <section>
  3407. * 2. As an <aside class="notes"> inside of the slide
  3408. *
  3409. * @param {HTMLElement} [slide=currentSlide]
  3410. * @return {(string|null)}
  3411. */
  3412. function getSlideNotes( slide ) {
  3413. // Default to the current slide
  3414. slide = slide || currentSlide;
  3415. // Notes can be specified via the data-notes attribute...
  3416. if( slide.hasAttribute( 'data-notes' ) ) {
  3417. return slide.getAttribute( 'data-notes' );
  3418. }
  3419. // ... or using an <aside class="notes"> element
  3420. var notesElement = slide.querySelector( 'aside.notes' );
  3421. if( notesElement ) {
  3422. return notesElement.innerHTML;
  3423. }
  3424. return null;
  3425. }
  3426. /**
  3427. * Retrieves the current state of the presentation as
  3428. * an object. This state can then be restored at any
  3429. * time.
  3430. *
  3431. * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
  3432. */
  3433. function getState() {
  3434. var indices = getIndices();
  3435. return {
  3436. indexh: indices.h,
  3437. indexv: indices.v,
  3438. indexf: indices.f,
  3439. paused: isPaused(),
  3440. overview: isOverview()
  3441. };
  3442. }
  3443. /**
  3444. * Restores the presentation to the given state.
  3445. *
  3446. * @param {object} state As generated by getState()
  3447. * @see {@link getState} generates the parameter `state`
  3448. */
  3449. function setState( state ) {
  3450. if( typeof state === 'object' ) {
  3451. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  3452. var pausedFlag = deserialize( state.paused ),
  3453. overviewFlag = deserialize( state.overview );
  3454. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  3455. togglePause( pausedFlag );
  3456. }
  3457. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  3458. toggleOverview( overviewFlag );
  3459. }
  3460. }
  3461. }
  3462. /**
  3463. * Return a sorted fragments list, ordered by an increasing
  3464. * "data-fragment-index" attribute.
  3465. *
  3466. * Fragments will be revealed in the order that they are returned by
  3467. * this function, so you can use the index attributes to control the
  3468. * order of fragment appearance.
  3469. *
  3470. * To maintain a sensible default fragment order, fragments are presumed
  3471. * to be passed in document order. This function adds a "fragment-index"
  3472. * attribute to each node if such an attribute is not already present,
  3473. * and sets that attribute to an integer value which is the position of
  3474. * the fragment within the fragments list.
  3475. *
  3476. * @param {object[]|*} fragments
  3477. * @param {boolean} grouped If true the returned array will contain
  3478. * nested arrays for all fragments with the same index
  3479. * @return {object[]} sorted Sorted array of fragments
  3480. */
  3481. function sortFragments( fragments, grouped ) {
  3482. fragments = toArray( fragments );
  3483. var ordered = [],
  3484. unordered = [],
  3485. sorted = [];
  3486. // Group ordered and unordered elements
  3487. fragments.forEach( function( fragment, i ) {
  3488. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  3489. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  3490. if( !ordered[index] ) {
  3491. ordered[index] = [];
  3492. }
  3493. ordered[index].push( fragment );
  3494. }
  3495. else {
  3496. unordered.push( [ fragment ] );
  3497. }
  3498. } );
  3499. // Append fragments without explicit indices in their
  3500. // DOM order
  3501. ordered = ordered.concat( unordered );
  3502. // Manually count the index up per group to ensure there
  3503. // are no gaps
  3504. var index = 0;
  3505. // Push all fragments in their sorted order to an array,
  3506. // this flattens the groups
  3507. ordered.forEach( function( group ) {
  3508. group.forEach( function( fragment ) {
  3509. sorted.push( fragment );
  3510. fragment.setAttribute( 'data-fragment-index', index );
  3511. } );
  3512. index ++;
  3513. } );
  3514. return grouped === true ? ordered : sorted;
  3515. }
  3516. /**
  3517. * Refreshes the fragments on the current slide so that they
  3518. * have the appropriate classes (.visible + .current-fragment).
  3519. *
  3520. * @param {number} [index] The index of the current fragment
  3521. * @param {array} [fragments] Array containing all fragments
  3522. * in the current slide
  3523. *
  3524. * @return {{shown: array, hidden: array}}
  3525. */
  3526. function updateFragments( index, fragments ) {
  3527. var changedFragments = {
  3528. shown: [],
  3529. hidden: []
  3530. };
  3531. if( currentSlide && config.fragments ) {
  3532. fragments = fragments || sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3533. if( fragments.length ) {
  3534. if( typeof index !== 'number' ) {
  3535. var currentFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3536. if( currentFragment ) {
  3537. index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3538. }
  3539. }
  3540. toArray( fragments ).forEach( function( el, i ) {
  3541. if( el.hasAttribute( 'data-fragment-index' ) ) {
  3542. i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
  3543. }
  3544. // Visible fragments
  3545. if( i <= index ) {
  3546. if( !el.classList.contains( 'visible' ) ) changedFragments.shown.push( el );
  3547. el.classList.add( 'visible' );
  3548. el.classList.remove( 'current-fragment' );
  3549. // Announce the fragments one by one to the Screen Reader
  3550. dom.statusDiv.textContent = getStatusText( el );
  3551. if( i === index ) {
  3552. el.classList.add( 'current-fragment' );
  3553. startEmbeddedContent( el );
  3554. }
  3555. }
  3556. // Hidden fragments
  3557. else {
  3558. if( el.classList.contains( 'visible' ) ) changedFragments.hidden.push( el );
  3559. el.classList.remove( 'visible' );
  3560. el.classList.remove( 'current-fragment' );
  3561. }
  3562. } );
  3563. }
  3564. }
  3565. return changedFragments;
  3566. }
  3567. /**
  3568. * Navigate to the specified slide fragment.
  3569. *
  3570. * @param {?number} index The index of the fragment that
  3571. * should be shown, -1 means all are invisible
  3572. * @param {number} offset Integer offset to apply to the
  3573. * fragment index
  3574. *
  3575. * @return {boolean} true if a change was made in any
  3576. * fragments visibility as part of this call
  3577. */
  3578. function navigateFragment( index, offset ) {
  3579. if( currentSlide && config.fragments ) {
  3580. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  3581. if( fragments.length ) {
  3582. // If no index is specified, find the current
  3583. if( typeof index !== 'number' ) {
  3584. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  3585. if( lastVisibleFragment ) {
  3586. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  3587. }
  3588. else {
  3589. index = -1;
  3590. }
  3591. }
  3592. // If an offset is specified, apply it to the index
  3593. if( typeof offset === 'number' ) {
  3594. index += offset;
  3595. }
  3596. var changedFragments = updateFragments( index, fragments );
  3597. if( changedFragments.hidden.length ) {
  3598. dispatchEvent( 'fragmenthidden', { fragment: changedFragments.hidden[0], fragments: changedFragments.hidden } );
  3599. }
  3600. if( changedFragments.shown.length ) {
  3601. dispatchEvent( 'fragmentshown', { fragment: changedFragments.shown[0], fragments: changedFragments.shown } );
  3602. }
  3603. updateControls();
  3604. updateProgress();
  3605. if( config.fragmentInURL ) {
  3606. writeURL();
  3607. }
  3608. return !!( changedFragments.shown.length || changedFragments.hidden.length );
  3609. }
  3610. }
  3611. return false;
  3612. }
  3613. /**
  3614. * Navigate to the next slide fragment.
  3615. *
  3616. * @return {boolean} true if there was a next fragment,
  3617. * false otherwise
  3618. */
  3619. function nextFragment() {
  3620. return navigateFragment( null, 1 );
  3621. }
  3622. /**
  3623. * Navigate to the previous slide fragment.
  3624. *
  3625. * @return {boolean} true if there was a previous fragment,
  3626. * false otherwise
  3627. */
  3628. function previousFragment() {
  3629. return navigateFragment( null, -1 );
  3630. }
  3631. /**
  3632. * Cues a new automated slide if enabled in the config.
  3633. */
  3634. function cueAutoSlide() {
  3635. cancelAutoSlide();
  3636. if( currentSlide && config.autoSlide !== false ) {
  3637. var fragment = currentSlide.querySelector( '.current-fragment' );
  3638. // When the slide first appears there is no "current" fragment so
  3639. // we look for a data-autoslide timing on the first fragment
  3640. if( !fragment ) fragment = currentSlide.querySelector( '.fragment' );
  3641. var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
  3642. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  3643. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  3644. // Pick value in the following priority order:
  3645. // 1. Current fragment's data-autoslide
  3646. // 2. Current slide's data-autoslide
  3647. // 3. Parent slide's data-autoslide
  3648. // 4. Global autoSlide setting
  3649. if( fragmentAutoSlide ) {
  3650. autoSlide = parseInt( fragmentAutoSlide, 10 );
  3651. }
  3652. else if( slideAutoSlide ) {
  3653. autoSlide = parseInt( slideAutoSlide, 10 );
  3654. }
  3655. else if( parentAutoSlide ) {
  3656. autoSlide = parseInt( parentAutoSlide, 10 );
  3657. }
  3658. else {
  3659. autoSlide = config.autoSlide;
  3660. }
  3661. // If there are media elements with data-autoplay,
  3662. // automatically set the autoSlide duration to the
  3663. // length of that media. Not applicable if the slide
  3664. // is divided up into fragments.
  3665. // playbackRate is accounted for in the duration.
  3666. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  3667. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  3668. if( el.hasAttribute( 'data-autoplay' ) ) {
  3669. if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
  3670. autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
  3671. }
  3672. }
  3673. } );
  3674. }
  3675. // Cue the next auto-slide if:
  3676. // - There is an autoSlide value
  3677. // - Auto-sliding isn't paused by the user
  3678. // - The presentation isn't paused
  3679. // - The overview isn't active
  3680. // - The presentation isn't over
  3681. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  3682. autoSlideTimeout = setTimeout( function() {
  3683. typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
  3684. cueAutoSlide();
  3685. }, autoSlide );
  3686. autoSlideStartTime = Date.now();
  3687. }
  3688. if( autoSlidePlayer ) {
  3689. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  3690. }
  3691. }
  3692. }
  3693. /**
  3694. * Cancels any ongoing request to auto-slide.
  3695. */
  3696. function cancelAutoSlide() {
  3697. clearTimeout( autoSlideTimeout );
  3698. autoSlideTimeout = -1;
  3699. }
  3700. function pauseAutoSlide() {
  3701. if( autoSlide && !autoSlidePaused ) {
  3702. autoSlidePaused = true;
  3703. dispatchEvent( 'autoslidepaused' );
  3704. clearTimeout( autoSlideTimeout );
  3705. if( autoSlidePlayer ) {
  3706. autoSlidePlayer.setPlaying( false );
  3707. }
  3708. }
  3709. }
  3710. function resumeAutoSlide() {
  3711. if( autoSlide && autoSlidePaused ) {
  3712. autoSlidePaused = false;
  3713. dispatchEvent( 'autoslideresumed' );
  3714. cueAutoSlide();
  3715. }
  3716. }
  3717. function navigateLeft() {
  3718. // Reverse for RTL
  3719. if( config.rtl ) {
  3720. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  3721. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3722. }
  3723. }
  3724. // Normal navigation
  3725. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  3726. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3727. }
  3728. }
  3729. function navigateRight() {
  3730. hasNavigatedRight = true;
  3731. // Reverse for RTL
  3732. if( config.rtl ) {
  3733. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  3734. slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
  3735. }
  3736. }
  3737. // Normal navigation
  3738. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  3739. slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
  3740. }
  3741. }
  3742. function navigateUp() {
  3743. // Prioritize hiding fragments
  3744. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  3745. slide( indexh, indexv - 1 );
  3746. }
  3747. }
  3748. function navigateDown() {
  3749. hasNavigatedDown = true;
  3750. // Prioritize revealing fragments
  3751. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  3752. slide( indexh, indexv + 1 );
  3753. }
  3754. }
  3755. /**
  3756. * Navigates backwards, prioritized in the following order:
  3757. * 1) Previous fragment
  3758. * 2) Previous vertical slide
  3759. * 3) Previous horizontal slide
  3760. */
  3761. function navigatePrev() {
  3762. // Prioritize revealing fragments
  3763. if( previousFragment() === false ) {
  3764. if( availableRoutes().up ) {
  3765. navigateUp();
  3766. }
  3767. else {
  3768. // Fetch the previous horizontal slide, if there is one
  3769. var previousSlide;
  3770. if( config.rtl ) {
  3771. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  3772. }
  3773. else {
  3774. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  3775. }
  3776. if( previousSlide ) {
  3777. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  3778. var h = indexh - 1;
  3779. slide( h, v );
  3780. }
  3781. }
  3782. }
  3783. }
  3784. /**
  3785. * The reverse of #navigatePrev().
  3786. */
  3787. function navigateNext() {
  3788. hasNavigatedRight = true;
  3789. hasNavigatedDown = true;
  3790. // Prioritize revealing fragments
  3791. if( nextFragment() === false ) {
  3792. var routes = availableRoutes();
  3793. // When looping is enabled `routes.down` is always available
  3794. // so we need a separate check for when we've reached the
  3795. // end of a stack and should move horizontally
  3796. if( routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide( currentSlide ) ) {
  3797. routes.down = false;
  3798. }
  3799. if( routes.down ) {
  3800. navigateDown();
  3801. }
  3802. else if( config.rtl ) {
  3803. navigateLeft();
  3804. }
  3805. else {
  3806. navigateRight();
  3807. }
  3808. }
  3809. }
  3810. /**
  3811. * Checks if the target element prevents the triggering of
  3812. * swipe navigation.
  3813. */
  3814. function isSwipePrevented( target ) {
  3815. while( target && typeof target.hasAttribute === 'function' ) {
  3816. if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
  3817. target = target.parentNode;
  3818. }
  3819. return false;
  3820. }
  3821. // --------------------------------------------------------------------//
  3822. // ----------------------------- EVENTS -------------------------------//
  3823. // --------------------------------------------------------------------//
  3824. /**
  3825. * Called by all event handlers that are based on user
  3826. * input.
  3827. *
  3828. * @param {object} [event]
  3829. */
  3830. function onUserInput( event ) {
  3831. if( config.autoSlideStoppable ) {
  3832. pauseAutoSlide();
  3833. }
  3834. }
  3835. /**
  3836. * Called whenever there is mouse input at the document level
  3837. * to determine if the cursor is active or not.
  3838. *
  3839. * @param {object} event
  3840. */
  3841. function onDocumentCursorActive( event ) {
  3842. showCursor();
  3843. clearTimeout( cursorInactiveTimeout );
  3844. cursorInactiveTimeout = setTimeout( hideCursor, config.hideCursorTime );
  3845. }
  3846. /**
  3847. * Handler for the document level 'keypress' event.
  3848. *
  3849. * @param {object} event
  3850. */
  3851. function onDocumentKeyPress( event ) {
  3852. // Check if the pressed key is question mark
  3853. if( event.shiftKey && event.charCode === 63 ) {
  3854. toggleHelp();
  3855. }
  3856. }
  3857. /**
  3858. * Handler for the document level 'keydown' event.
  3859. *
  3860. * @param {object} event
  3861. */
  3862. function onDocumentKeyDown( event ) {
  3863. // If there's a condition specified and it returns false,
  3864. // ignore this event
  3865. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
  3866. return true;
  3867. }
  3868. // Shorthand
  3869. var keyCode = event.keyCode;
  3870. // Remember if auto-sliding was paused so we can toggle it
  3871. var autoSlideWasPaused = autoSlidePaused;
  3872. onUserInput( event );
  3873. // Is there a focused element that could be using the keyboard?
  3874. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  3875. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  3876. var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
  3877. // Whitelist specific modified + keycode combinations
  3878. var prevSlideShortcut = event.shiftKey && event.keyCode === 32;
  3879. var firstSlideShortcut = ( event.metaKey || event.ctrlKey ) && keyCode === 37;
  3880. var lastSlideShortcut = ( event.metaKey || event.ctrlKey ) && keyCode === 39;
  3881. // Prevent all other events when a modifier is pressed
  3882. var unusedModifier = !prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
  3883. ( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );
  3884. // Disregard the event if there's a focused element or a
  3885. // keyboard modifier key is present
  3886. if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;
  3887. // While paused only allow resume keyboard events; 'b', 'v', '.'
  3888. var resumeKeyCodes = [66,86,190,191];
  3889. var key;
  3890. // Custom key bindings for togglePause should be able to resume
  3891. if( typeof config.keyboard === 'object' ) {
  3892. for( key in config.keyboard ) {
  3893. if( config.keyboard[key] === 'togglePause' ) {
  3894. resumeKeyCodes.push( parseInt( key, 10 ) );
  3895. }
  3896. }
  3897. }
  3898. if( isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
  3899. return false;
  3900. }
  3901. var triggered = false;
  3902. // 1. User defined key bindings
  3903. if( typeof config.keyboard === 'object' ) {
  3904. for( key in config.keyboard ) {
  3905. // Check if this binding matches the pressed key
  3906. if( parseInt( key, 10 ) === keyCode ) {
  3907. var value = config.keyboard[ key ];
  3908. // Callback function
  3909. if( typeof value === 'function' ) {
  3910. value.apply( null, [ event ] );
  3911. }
  3912. // String shortcuts to reveal.js API
  3913. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  3914. Reveal[ value ].call();
  3915. }
  3916. triggered = true;
  3917. }
  3918. }
  3919. }
  3920. // 2. Registered custom key bindings
  3921. if( triggered === false ) {
  3922. for( key in registeredKeyBindings ) {
  3923. // Check if this binding matches the pressed key
  3924. if( parseInt( key, 10 ) === keyCode ) {
  3925. var action = registeredKeyBindings[ key ].callback;
  3926. // Callback function
  3927. if( typeof action === 'function' ) {
  3928. action.apply( null, [ event ] );
  3929. }
  3930. // String shortcuts to reveal.js API
  3931. else if( typeof action === 'string' && typeof Reveal[ action ] === 'function' ) {
  3932. Reveal[ action ].call();
  3933. }
  3934. triggered = true;
  3935. }
  3936. }
  3937. }
  3938. // 3. System defined key bindings
  3939. if( triggered === false ) {
  3940. // Assume true and try to prove false
  3941. triggered = true;
  3942. // P, PAGE UP
  3943. if( keyCode === 80 || keyCode === 33 ) {
  3944. navigatePrev();
  3945. }
  3946. // N, PAGE DOWN
  3947. else if( keyCode === 78 || keyCode === 34 ) {
  3948. navigateNext();
  3949. }
  3950. // H, LEFT
  3951. else if( keyCode === 72 || keyCode === 37 ) {
  3952. if( firstSlideShortcut ) {
  3953. slide( 0 );
  3954. }
  3955. else if( !isOverview() && config.navigationMode === 'linear' ) {
  3956. navigatePrev();
  3957. }
  3958. else {
  3959. navigateLeft();
  3960. }
  3961. }
  3962. // L, RIGHT
  3963. else if( keyCode === 76 || keyCode === 39 ) {
  3964. if( lastSlideShortcut ) {
  3965. slide( Number.MAX_VALUE );
  3966. }
  3967. else if( !isOverview() && config.navigationMode === 'linear' ) {
  3968. navigateNext();
  3969. }
  3970. else {
  3971. navigateRight();
  3972. }
  3973. }
  3974. // K, UP
  3975. else if( keyCode === 75 || keyCode === 38 ) {
  3976. if( !isOverview() && config.navigationMode === 'linear' ) {
  3977. navigatePrev();
  3978. }
  3979. else {
  3980. navigateUp();
  3981. }
  3982. }
  3983. // J, DOWN
  3984. else if( keyCode === 74 || keyCode === 40 ) {
  3985. if( !isOverview() && config.navigationMode === 'linear' ) {
  3986. navigateNext();
  3987. }
  3988. else {
  3989. navigateDown();
  3990. }
  3991. }
  3992. // HOME
  3993. else if( keyCode === 36 ) {
  3994. slide( 0 );
  3995. }
  3996. // END
  3997. else if( keyCode === 35 ) {
  3998. slide( Number.MAX_VALUE );
  3999. }
  4000. // SPACE
  4001. else if( keyCode === 32 ) {
  4002. if( isOverview() ) {
  4003. deactivateOverview();
  4004. }
  4005. if( event.shiftKey ) {
  4006. navigatePrev();
  4007. }
  4008. else {
  4009. navigateNext();
  4010. }
  4011. }
  4012. // TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS "BLACK SCREEN" BUTTON
  4013. else if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {
  4014. togglePause();
  4015. }
  4016. // F
  4017. else if( keyCode === 70 ) {
  4018. enterFullscreen();
  4019. }
  4020. // A
  4021. else if( keyCode === 65 ) {
  4022. if ( config.autoSlideStoppable ) {
  4023. toggleAutoSlide( autoSlideWasPaused );
  4024. }
  4025. }
  4026. else {
  4027. triggered = false;
  4028. }
  4029. }
  4030. // If the input resulted in a triggered action we should prevent
  4031. // the browsers default behavior
  4032. if( triggered ) {
  4033. event.preventDefault && event.preventDefault();
  4034. }
  4035. // ESC or O key
  4036. else if ( ( keyCode === 27 || keyCode === 79 ) && features.transforms3d ) {
  4037. if( dom.overlay ) {
  4038. closeOverlay();
  4039. }
  4040. else {
  4041. toggleOverview();
  4042. }
  4043. event.preventDefault && event.preventDefault();
  4044. }
  4045. // If auto-sliding is enabled we need to cue up
  4046. // another timeout
  4047. cueAutoSlide();
  4048. }
  4049. /**
  4050. * Handler for the 'touchstart' event, enables support for
  4051. * swipe and pinch gestures.
  4052. *
  4053. * @param {object} event
  4054. */
  4055. function onTouchStart( event ) {
  4056. if( isSwipePrevented( event.target ) ) return true;
  4057. touch.startX = event.touches[0].clientX;
  4058. touch.startY = event.touches[0].clientY;
  4059. touch.startCount = event.touches.length;
  4060. }
  4061. /**
  4062. * Handler for the 'touchmove' event.
  4063. *
  4064. * @param {object} event
  4065. */
  4066. function onTouchMove( event ) {
  4067. if( isSwipePrevented( event.target ) ) return true;
  4068. // Each touch should only trigger one action
  4069. if( !touch.captured ) {
  4070. onUserInput( event );
  4071. var currentX = event.touches[0].clientX;
  4072. var currentY = event.touches[0].clientY;
  4073. // There was only one touch point, look for a swipe
  4074. if( event.touches.length === 1 && touch.startCount !== 2 ) {
  4075. var deltaX = currentX - touch.startX,
  4076. deltaY = currentY - touch.startY;
  4077. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4078. touch.captured = true;
  4079. navigateLeft();
  4080. }
  4081. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  4082. touch.captured = true;
  4083. navigateRight();
  4084. }
  4085. else if( deltaY > touch.threshold ) {
  4086. touch.captured = true;
  4087. navigateUp();
  4088. }
  4089. else if( deltaY < -touch.threshold ) {
  4090. touch.captured = true;
  4091. navigateDown();
  4092. }
  4093. // If we're embedded, only block touch events if they have
  4094. // triggered an action
  4095. if( config.embedded ) {
  4096. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  4097. event.preventDefault();
  4098. }
  4099. }
  4100. // Not embedded? Block them all to avoid needless tossing
  4101. // around of the viewport in iOS
  4102. else {
  4103. event.preventDefault();
  4104. }
  4105. }
  4106. }
  4107. // There's a bug with swiping on some Android devices unless
  4108. // the default action is always prevented
  4109. else if( UA.match( /android/gi ) ) {
  4110. event.preventDefault();
  4111. }
  4112. }
  4113. /**
  4114. * Handler for the 'touchend' event.
  4115. *
  4116. * @param {object} event
  4117. */
  4118. function onTouchEnd( event ) {
  4119. touch.captured = false;
  4120. }
  4121. /**
  4122. * Convert pointer down to touch start.
  4123. *
  4124. * @param {object} event
  4125. */
  4126. function onPointerDown( event ) {
  4127. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4128. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4129. onTouchStart( event );
  4130. }
  4131. }
  4132. /**
  4133. * Convert pointer move to touch move.
  4134. *
  4135. * @param {object} event
  4136. */
  4137. function onPointerMove( event ) {
  4138. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4139. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4140. onTouchMove( event );
  4141. }
  4142. }
  4143. /**
  4144. * Convert pointer up to touch end.
  4145. *
  4146. * @param {object} event
  4147. */
  4148. function onPointerUp( event ) {
  4149. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  4150. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  4151. onTouchEnd( event );
  4152. }
  4153. }
  4154. /**
  4155. * Handles mouse wheel scrolling, throttled to avoid skipping
  4156. * multiple slides.
  4157. *
  4158. * @param {object} event
  4159. */
  4160. function onDocumentMouseScroll( event ) {
  4161. if( Date.now() - lastMouseWheelStep > 600 ) {
  4162. lastMouseWheelStep = Date.now();
  4163. var delta = event.detail || -event.wheelDelta;
  4164. if( delta > 0 ) {
  4165. navigateNext();
  4166. }
  4167. else if( delta < 0 ) {
  4168. navigatePrev();
  4169. }
  4170. }
  4171. }
  4172. /**
  4173. * Clicking on the progress bar results in a navigation to the
  4174. * closest approximate horizontal slide using this equation:
  4175. *
  4176. * ( clickX / presentationWidth ) * numberOfSlides
  4177. *
  4178. * @param {object} event
  4179. */
  4180. function onProgressClicked( event ) {
  4181. onUserInput( event );
  4182. event.preventDefault();
  4183. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  4184. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  4185. if( config.rtl ) {
  4186. slideIndex = slidesTotal - slideIndex;
  4187. }
  4188. slide( slideIndex );
  4189. }
  4190. /**
  4191. * Event handler for navigation control buttons.
  4192. */
  4193. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigatePrev() : navigateLeft(); }
  4194. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigateNext() : navigateRight(); }
  4195. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  4196. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  4197. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  4198. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  4199. /**
  4200. * Handler for the window level 'hashchange' event.
  4201. *
  4202. * @param {object} [event]
  4203. */
  4204. function onWindowHashChange( event ) {
  4205. readURL();
  4206. }
  4207. /**
  4208. * Handler for the window level 'resize' event.
  4209. *
  4210. * @param {object} [event]
  4211. */
  4212. function onWindowResize( event ) {
  4213. layout();
  4214. }
  4215. /**
  4216. * Handle for the window level 'visibilitychange' event.
  4217. *
  4218. * @param {object} [event]
  4219. */
  4220. function onPageVisibilityChange( event ) {
  4221. var isHidden = document.webkitHidden ||
  4222. document.msHidden ||
  4223. document.hidden;
  4224. // If, after clicking a link or similar and we're coming back,
  4225. // focus the document.body to ensure we can use keyboard shortcuts
  4226. if( isHidden === false && document.activeElement !== document.body ) {
  4227. // Not all elements support .blur() - SVGs among them.
  4228. if( typeof document.activeElement.blur === 'function' ) {
  4229. document.activeElement.blur();
  4230. }
  4231. document.body.focus();
  4232. }
  4233. }
  4234. /**
  4235. * Invoked when a slide is and we're in the overview.
  4236. *
  4237. * @param {object} event
  4238. */
  4239. function onOverviewSlideClicked( event ) {
  4240. // TODO There's a bug here where the event listeners are not
  4241. // removed after deactivating the overview.
  4242. if( eventsAreBound && isOverview() ) {
  4243. event.preventDefault();
  4244. var element = event.target;
  4245. while( element && !element.nodeName.match( /section/gi ) ) {
  4246. element = element.parentNode;
  4247. }
  4248. if( element && !element.classList.contains( 'disabled' ) ) {
  4249. deactivateOverview();
  4250. if( element.nodeName.match( /section/gi ) ) {
  4251. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  4252. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  4253. slide( h, v );
  4254. }
  4255. }
  4256. }
  4257. }
  4258. /**
  4259. * Handles clicks on links that are set to preview in the
  4260. * iframe overlay.
  4261. *
  4262. * @param {object} event
  4263. */
  4264. function onPreviewLinkClicked( event ) {
  4265. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  4266. var url = event.currentTarget.getAttribute( 'href' );
  4267. if( url ) {
  4268. showPreview( url );
  4269. event.preventDefault();
  4270. }
  4271. }
  4272. }
  4273. /**
  4274. * Handles click on the auto-sliding controls element.
  4275. *
  4276. * @param {object} [event]
  4277. */
  4278. function onAutoSlidePlayerClick( event ) {
  4279. // Replay
  4280. if( Reveal.isLastSlide() && config.loop === false ) {
  4281. slide( 0, 0 );
  4282. resumeAutoSlide();
  4283. }
  4284. // Resume
  4285. else if( autoSlidePaused ) {
  4286. resumeAutoSlide();
  4287. }
  4288. // Pause
  4289. else {
  4290. pauseAutoSlide();
  4291. }
  4292. }
  4293. // --------------------------------------------------------------------//
  4294. // ------------------------ PLAYBACK COMPONENT ------------------------//
  4295. // --------------------------------------------------------------------//
  4296. /**
  4297. * Constructor for the playback component, which displays
  4298. * play/pause/progress controls.
  4299. *
  4300. * @param {HTMLElement} container The component will append
  4301. * itself to this
  4302. * @param {function} progressCheck A method which will be
  4303. * called frequently to get the current progress on a range
  4304. * of 0-1
  4305. */
  4306. function Playback( container, progressCheck ) {
  4307. // Cosmetics
  4308. this.diameter = 100;
  4309. this.diameter2 = this.diameter/2;
  4310. this.thickness = 6;
  4311. // Flags if we are currently playing
  4312. this.playing = false;
  4313. // Current progress on a 0-1 range
  4314. this.progress = 0;
  4315. // Used to loop the animation smoothly
  4316. this.progressOffset = 1;
  4317. this.container = container;
  4318. this.progressCheck = progressCheck;
  4319. this.canvas = document.createElement( 'canvas' );
  4320. this.canvas.className = 'playback';
  4321. this.canvas.width = this.diameter;
  4322. this.canvas.height = this.diameter;
  4323. this.canvas.style.width = this.diameter2 + 'px';
  4324. this.canvas.style.height = this.diameter2 + 'px';
  4325. this.context = this.canvas.getContext( '2d' );
  4326. this.container.appendChild( this.canvas );
  4327. this.render();
  4328. }
  4329. /**
  4330. * @param value
  4331. */
  4332. Playback.prototype.setPlaying = function( value ) {
  4333. var wasPlaying = this.playing;
  4334. this.playing = value;
  4335. // Start repainting if we weren't already
  4336. if( !wasPlaying && this.playing ) {
  4337. this.animate();
  4338. }
  4339. else {
  4340. this.render();
  4341. }
  4342. };
  4343. Playback.prototype.animate = function() {
  4344. var progressBefore = this.progress;
  4345. this.progress = this.progressCheck();
  4346. // When we loop, offset the progress so that it eases
  4347. // smoothly rather than immediately resetting
  4348. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  4349. this.progressOffset = this.progress;
  4350. }
  4351. this.render();
  4352. if( this.playing ) {
  4353. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  4354. }
  4355. };
  4356. /**
  4357. * Renders the current progress and playback state.
  4358. */
  4359. Playback.prototype.render = function() {
  4360. var progress = this.playing ? this.progress : 0,
  4361. radius = ( this.diameter2 ) - this.thickness,
  4362. x = this.diameter2,
  4363. y = this.diameter2,
  4364. iconSize = 28;
  4365. // Ease towards 1
  4366. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  4367. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  4368. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  4369. this.context.save();
  4370. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  4371. // Solid background color
  4372. this.context.beginPath();
  4373. this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
  4374. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  4375. this.context.fill();
  4376. // Draw progress track
  4377. this.context.beginPath();
  4378. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  4379. this.context.lineWidth = this.thickness;
  4380. this.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';
  4381. this.context.stroke();
  4382. if( this.playing ) {
  4383. // Draw progress on top of track
  4384. this.context.beginPath();
  4385. this.context.arc( x, y, radius, startAngle, endAngle, false );
  4386. this.context.lineWidth = this.thickness;
  4387. this.context.strokeStyle = '#fff';
  4388. this.context.stroke();
  4389. }
  4390. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  4391. // Draw play/pause icons
  4392. if( this.playing ) {
  4393. this.context.fillStyle = '#fff';
  4394. this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
  4395. this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
  4396. }
  4397. else {
  4398. this.context.beginPath();
  4399. this.context.translate( 4, 0 );
  4400. this.context.moveTo( 0, 0 );
  4401. this.context.lineTo( iconSize - 4, iconSize / 2 );
  4402. this.context.lineTo( 0, iconSize );
  4403. this.context.fillStyle = '#fff';
  4404. this.context.fill();
  4405. }
  4406. this.context.restore();
  4407. };
  4408. Playback.prototype.on = function( type, listener ) {
  4409. this.canvas.addEventListener( type, listener, false );
  4410. };
  4411. Playback.prototype.off = function( type, listener ) {
  4412. this.canvas.removeEventListener( type, listener, false );
  4413. };
  4414. Playback.prototype.destroy = function() {
  4415. this.playing = false;
  4416. if( this.canvas.parentNode ) {
  4417. this.container.removeChild( this.canvas );
  4418. }
  4419. };
  4420. // --------------------------------------------------------------------//
  4421. // ------------------------------- API --------------------------------//
  4422. // --------------------------------------------------------------------//
  4423. Reveal = {
  4424. VERSION: VERSION,
  4425. initialize: initialize,
  4426. configure: configure,
  4427. sync: sync,
  4428. syncSlide: syncSlide,
  4429. syncFragments: syncFragments,
  4430. // Navigation methods
  4431. slide: slide,
  4432. left: navigateLeft,
  4433. right: navigateRight,
  4434. up: navigateUp,
  4435. down: navigateDown,
  4436. prev: navigatePrev,
  4437. next: navigateNext,
  4438. // Fragment methods
  4439. navigateFragment: navigateFragment,
  4440. prevFragment: previousFragment,
  4441. nextFragment: nextFragment,
  4442. // Deprecated aliases
  4443. navigateTo: slide,
  4444. navigateLeft: navigateLeft,
  4445. navigateRight: navigateRight,
  4446. navigateUp: navigateUp,
  4447. navigateDown: navigateDown,
  4448. navigatePrev: navigatePrev,
  4449. navigateNext: navigateNext,
  4450. // Forces an update in slide layout
  4451. layout: layout,
  4452. // Randomizes the order of slides
  4453. shuffle: shuffle,
  4454. // Returns an object with the available routes as booleans (left/right/top/bottom)
  4455. availableRoutes: availableRoutes,
  4456. // Returns an object with the available fragments as booleans (prev/next)
  4457. availableFragments: availableFragments,
  4458. // Toggles a help overlay with keyboard shortcuts
  4459. toggleHelp: toggleHelp,
  4460. // Toggles the overview mode on/off
  4461. toggleOverview: toggleOverview,
  4462. // Toggles the "black screen" mode on/off
  4463. togglePause: togglePause,
  4464. // Toggles the auto slide mode on/off
  4465. toggleAutoSlide: toggleAutoSlide,
  4466. // State checks
  4467. isOverview: isOverview,
  4468. isPaused: isPaused,
  4469. isAutoSliding: isAutoSliding,
  4470. isSpeakerNotes: isSpeakerNotes,
  4471. // Slide preloading
  4472. loadSlide: loadSlide,
  4473. unloadSlide: unloadSlide,
  4474. // Adds or removes all internal event listeners (such as keyboard)
  4475. addEventListeners: addEventListeners,
  4476. removeEventListeners: removeEventListeners,
  4477. // Facility for persisting and restoring the presentation state
  4478. getState: getState,
  4479. setState: setState,
  4480. // Presentation progress
  4481. getSlidePastCount: getSlidePastCount,
  4482. // Presentation progress on range of 0-1
  4483. getProgress: getProgress,
  4484. // Returns the indices of the current, or specified, slide
  4485. getIndices: getIndices,
  4486. // Returns an Array of all slides
  4487. getSlides: getSlides,
  4488. // Returns an Array of objects representing the attributes on
  4489. // the slides
  4490. getSlidesAttributes: getSlidesAttributes,
  4491. // Returns the total number of slides
  4492. getTotalSlides: getTotalSlides,
  4493. // Returns the slide element at the specified index
  4494. getSlide: getSlide,
  4495. // Returns the slide background element at the specified index
  4496. getSlideBackground: getSlideBackground,
  4497. // Returns the speaker notes string for a slide, or null
  4498. getSlideNotes: getSlideNotes,
  4499. // Returns the previous slide element, may be null
  4500. getPreviousSlide: function() {
  4501. return previousSlide;
  4502. },
  4503. // Returns the current slide element
  4504. getCurrentSlide: function() {
  4505. return currentSlide;
  4506. },
  4507. // Returns the current scale of the presentation content
  4508. getScale: function() {
  4509. return scale;
  4510. },
  4511. // Returns the current configuration object
  4512. getConfig: function() {
  4513. return config;
  4514. },
  4515. // Helper method, retrieves query string as a key/value hash
  4516. getQueryHash: function() {
  4517. var query = {};
  4518. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  4519. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  4520. } );
  4521. // Basic deserialization
  4522. for( var i in query ) {
  4523. var value = query[ i ];
  4524. query[ i ] = deserialize( unescape( value ) );
  4525. }
  4526. return query;
  4527. },
  4528. // Returns the top-level DOM element
  4529. getRevealElement: function() {
  4530. return dom.wrapper || document.querySelector( '.reveal' );
  4531. },
  4532. // Returns true if we're currently on the first slide
  4533. isFirstSlide: function() {
  4534. return ( indexh === 0 && indexv === 0 );
  4535. },
  4536. // Returns true if we're currently on the last slide
  4537. isLastSlide: function() {
  4538. if( currentSlide ) {
  4539. // Does this slide have a next sibling?
  4540. if( currentSlide.nextElementSibling ) return false;
  4541. // If it's vertical, does its parent have a next sibling?
  4542. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  4543. return true;
  4544. }
  4545. return false;
  4546. },
  4547. // Returns true if we're on the last slide in the current
  4548. // vertical stack
  4549. isLastVerticalSlide: function() {
  4550. if( currentSlide && isVerticalSlide( currentSlide ) ) {
  4551. // Does this slide have a next sibling?
  4552. if( currentSlide.nextElementSibling ) return false;
  4553. return true;
  4554. }
  4555. return false;
  4556. },
  4557. // Checks if reveal.js has been loaded and is ready for use
  4558. isReady: function() {
  4559. return loaded;
  4560. },
  4561. // Forward event binding to the reveal DOM element
  4562. addEventListener: function( type, listener, useCapture ) {
  4563. if( 'addEventListener' in window ) {
  4564. Reveal.getRevealElement().addEventListener( type, listener, useCapture );
  4565. }
  4566. },
  4567. removeEventListener: function( type, listener, useCapture ) {
  4568. if( 'addEventListener' in window ) {
  4569. Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
  4570. }
  4571. },
  4572. // Adds a custom key binding
  4573. addKeyBinding: addKeyBinding,
  4574. // Removes a custom key binding
  4575. removeKeyBinding: removeKeyBinding,
  4576. // Programatically triggers a keyboard event
  4577. triggerKey: function( keyCode ) {
  4578. onDocumentKeyDown( { keyCode: keyCode } );
  4579. },
  4580. // Registers a new shortcut to include in the help overlay
  4581. registerKeyboardShortcut: function( key, value ) {
  4582. keyboardShortcuts[key] = value;
  4583. }
  4584. };
  4585. return Reveal;
  4586. }));