reveal.js 157 KB

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