reveal.js 131 KB

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  1. /*!
  2. * reveal.js
  3. * http://lab.hakim.se/reveal-js
  4. * MIT licensed
  5. *
  6. * Copyright (C) 2016 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 = '3.3.0';
  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 controls in the bottom right corner
  44. controls: true,
  45. // Display a presentation progress bar
  46. progress: true,
  47. // Display the page number of the current slide
  48. slideNumber: false,
  49. // Push each slide change to the browser history
  50. history: false,
  51. // Enable keyboard shortcuts for navigation
  52. keyboard: true,
  53. // Optional function that blocks keyboard events when retuning false
  54. keyboardCondition: null,
  55. // Enable the slide overview mode
  56. overview: true,
  57. // Vertical centering of slides
  58. center: true,
  59. // Enables touch navigation on devices with touch input
  60. touch: true,
  61. // Loop the presentation
  62. loop: false,
  63. // Change the presentation direction to be RTL
  64. rtl: false,
  65. // Randomizes the order of slides each time the presentation loads
  66. shuffle: false,
  67. // Turns fragments on and off globally
  68. fragments: true,
  69. // Flags if the presentation is running in an embedded mode,
  70. // i.e. contained within a limited portion of the screen
  71. embedded: false,
  72. // Flags if we should show a help overlay when the questionmark
  73. // key is pressed
  74. help: true,
  75. // Flags if it should be possible to pause the presentation (blackout)
  76. pause: true,
  77. // Flags if speaker notes should be visible to all viewers
  78. showNotes: false,
  79. // Number of milliseconds between automatically proceeding to the
  80. // next slide, disabled when set to 0, this value can be overwritten
  81. // by using a data-autoslide attribute on your slides
  82. autoSlide: 0,
  83. // Stop auto-sliding after user input
  84. autoSlideStoppable: true,
  85. // Use this method for navigation when auto-sliding (defaults to navigateNext)
  86. autoSlideMethod: null,
  87. // Enable slide navigation via mouse wheel
  88. mouseWheel: false,
  89. // Apply a 3D roll to links on hover
  90. rollingLinks: false,
  91. // Hides the address bar on mobile devices
  92. hideAddressBar: true,
  93. // Opens links in an iframe preview overlay
  94. previewLinks: false,
  95. // Exposes the reveal.js API through window.postMessage
  96. postMessage: true,
  97. // Dispatches all reveal.js events to the parent window through postMessage
  98. postMessageEvents: false,
  99. // Focuses body when page changes visiblity to ensure keyboard shortcuts work
  100. focusBodyOnPageVisibilityChange: true,
  101. // Transition style
  102. transition: 'slide', // none/fade/slide/convex/concave/zoom
  103. // Transition speed
  104. transitionSpeed: 'default', // default/fast/slow
  105. // Transition style for full page slide backgrounds
  106. backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
  107. // Parallax background image
  108. parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
  109. // Parallax background size
  110. parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
  111. // Amount of pixels to move the parallax background per slide step
  112. parallaxBackgroundHorizontal: null,
  113. parallaxBackgroundVertical: null,
  114. // The maximum number of pages a single slide can expand onto when printing
  115. // to PDF, unlimited by default
  116. pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,
  117. // Number of slides away from the current that are visible
  118. viewDistance: 3,
  119. // Script dependencies to load
  120. dependencies: []
  121. },
  122. // Flags if Reveal.initialize() has been called
  123. initialized = false,
  124. // Flags if reveal.js is loaded (has dispatched the 'ready' event)
  125. loaded = false,
  126. // Flags if the overview mode is currently active
  127. overview = false,
  128. // Holds the dimensions of our overview slides, including margins
  129. overviewSlideWidth = null,
  130. overviewSlideHeight = null,
  131. // The horizontal and vertical index of the currently active slide
  132. indexh,
  133. indexv,
  134. // The previous and current slide HTML elements
  135. previousSlide,
  136. currentSlide,
  137. previousBackground,
  138. // Slides may hold a data-state attribute which we pick up and apply
  139. // as a class to the body. This list contains the combined state of
  140. // all current slides.
  141. state = [],
  142. // The current scale of the presentation (see width/height config)
  143. scale = 1,
  144. // CSS transform that is currently applied to the slides container,
  145. // split into two groups
  146. slidesTransform = { layout: '', overview: '' },
  147. // Cached references to DOM elements
  148. dom = {},
  149. // Features supported by the browser, see #checkCapabilities()
  150. features = {},
  151. // Client is a mobile device, see #checkCapabilities()
  152. isMobileDevice,
  153. // Client is a desktop Chrome, see #checkCapabilities()
  154. isChrome,
  155. // Throttles mouse wheel navigation
  156. lastMouseWheelStep = 0,
  157. // Delays updates to the URL due to a Chrome thumbnailer bug
  158. writeURLTimeout = 0,
  159. // Flags if the interaction event listeners are bound
  160. eventsAreBound = false,
  161. // The current auto-slide duration
  162. autoSlide = 0,
  163. // Auto slide properties
  164. autoSlidePlayer,
  165. autoSlideTimeout = 0,
  166. autoSlideStartTime = -1,
  167. autoSlidePaused = false,
  168. // Holds information about the currently ongoing touch input
  169. touch = {
  170. startX: 0,
  171. startY: 0,
  172. startSpan: 0,
  173. startCount: 0,
  174. captured: false,
  175. threshold: 40
  176. },
  177. // Holds information about the keyboard shortcuts
  178. keyboardShortcuts = {
  179. 'N , SPACE': 'Next slide',
  180. 'P': 'Previous slide',
  181. '← , H': 'Navigate left',
  182. '→ , L': 'Navigate right',
  183. '↑ , K': 'Navigate up',
  184. '↓ , J': 'Navigate down',
  185. 'Home': 'First slide',
  186. 'End': 'Last slide',
  187. 'B , .': 'Pause',
  188. 'F': 'Fullscreen',
  189. 'ESC, O': 'Slide overview'
  190. };
  191. /**
  192. * Starts up the presentation if the client is capable.
  193. */
  194. function initialize( options ) {
  195. // Make sure we only initialize once
  196. if( initialized === true ) return;
  197. initialized = true;
  198. checkCapabilities();
  199. if( !features.transforms2d && !features.transforms3d ) {
  200. document.body.setAttribute( 'class', 'no-transforms' );
  201. // Since JS won't be running any further, we load all lazy
  202. // loading elements upfront
  203. var images = toArray( document.getElementsByTagName( 'img' ) ),
  204. iframes = toArray( document.getElementsByTagName( 'iframe' ) );
  205. var lazyLoadable = images.concat( iframes );
  206. for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
  207. var element = lazyLoadable[i];
  208. if( element.getAttribute( 'data-src' ) ) {
  209. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  210. element.removeAttribute( 'data-src' );
  211. }
  212. }
  213. // If the browser doesn't support core features we won't be
  214. // using JavaScript to control the presentation
  215. return;
  216. }
  217. // Cache references to key DOM elements
  218. dom.wrapper = document.querySelector( '.reveal' );
  219. dom.slides = document.querySelector( '.reveal .slides' );
  220. // Force a layout when the whole page, incl fonts, has loaded
  221. window.addEventListener( 'load', layout, false );
  222. var query = Reveal.getQueryHash();
  223. // Do not accept new dependencies via query config to avoid
  224. // the potential of malicious script injection
  225. if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
  226. // Copy options over to our config object
  227. extend( config, options );
  228. extend( config, query );
  229. // Hide the address bar in mobile browsers
  230. hideAddressBar();
  231. // Loads the dependencies and continues to #start() once done
  232. load();
  233. }
  234. /**
  235. * Inspect the client to see what it's capable of, this
  236. * should only happens once per runtime.
  237. */
  238. function checkCapabilities() {
  239. isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA );
  240. isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
  241. var testElement = document.createElement( 'div' );
  242. features.transforms3d = 'WebkitPerspective' in testElement.style ||
  243. 'MozPerspective' in testElement.style ||
  244. 'msPerspective' in testElement.style ||
  245. 'OPerspective' in testElement.style ||
  246. 'perspective' in testElement.style;
  247. features.transforms2d = 'WebkitTransform' in testElement.style ||
  248. 'MozTransform' in testElement.style ||
  249. 'msTransform' in testElement.style ||
  250. 'OTransform' in testElement.style ||
  251. 'transform' in testElement.style;
  252. features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
  253. features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
  254. features.canvas = !!document.createElement( 'canvas' ).getContext;
  255. // Transitions in the overview are disabled in desktop and
  256. // Safari due to lag
  257. features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );
  258. // Flags if we should use zoom instead of transform to scale
  259. // up slides. Zoom produces crisper results but has a lot of
  260. // xbrowser quirks so we only use it in whitelsited browsers.
  261. features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
  262. ( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
  263. }
  264. /**
  265. * Loads the dependencies of reveal.js. Dependencies are
  266. * defined via the configuration option 'dependencies'
  267. * and will be loaded prior to starting/binding reveal.js.
  268. * Some dependencies may have an 'async' flag, if so they
  269. * will load after reveal.js has been started up.
  270. */
  271. function load() {
  272. var scripts = [],
  273. scriptsAsync = [],
  274. scriptsToPreload = 0;
  275. // Called once synchronous scripts finish loading
  276. function proceed() {
  277. if( scriptsAsync.length ) {
  278. // Load asynchronous scripts
  279. head.js.apply( null, scriptsAsync );
  280. }
  281. start();
  282. }
  283. function loadScript( s ) {
  284. head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
  285. // Extension may contain callback functions
  286. if( typeof s.callback === 'function' ) {
  287. s.callback.apply( this );
  288. }
  289. if( --scriptsToPreload === 0 ) {
  290. proceed();
  291. }
  292. });
  293. }
  294. for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
  295. var s = config.dependencies[i];
  296. // Load if there's no condition or the condition is truthy
  297. if( !s.condition || s.condition() ) {
  298. if( s.async ) {
  299. scriptsAsync.push( s.src );
  300. }
  301. else {
  302. scripts.push( s.src );
  303. }
  304. loadScript( s );
  305. }
  306. }
  307. if( scripts.length ) {
  308. scriptsToPreload = scripts.length;
  309. // Load synchronous scripts
  310. head.js.apply( null, scripts );
  311. }
  312. else {
  313. proceed();
  314. }
  315. }
  316. /**
  317. * Starts up reveal.js by binding input events and navigating
  318. * to the current URL deeplink if there is one.
  319. */
  320. function start() {
  321. // Make sure we've got all the DOM elements we need
  322. setupDOM();
  323. // Listen to messages posted to this window
  324. setupPostMessage();
  325. // Prevent the slides from being scrolled out of view
  326. setupScrollPrevention();
  327. // Resets all vertical slides so that only the first is visible
  328. resetVerticalSlides();
  329. // Updates the presentation to match the current configuration values
  330. configure();
  331. // Read the initial hash
  332. readURL();
  333. // Update all backgrounds
  334. updateBackground( true );
  335. // Notify listeners that the presentation is ready but use a 1ms
  336. // timeout to ensure it's not fired synchronously after #initialize()
  337. setTimeout( function() {
  338. // Enable transitions now that we're loaded
  339. dom.slides.classList.remove( 'no-transition' );
  340. loaded = true;
  341. dom.wrapper.classList.add( 'ready' );
  342. dispatchEvent( 'ready', {
  343. 'indexh': indexh,
  344. 'indexv': indexv,
  345. 'currentSlide': currentSlide
  346. } );
  347. }, 1 );
  348. // Special setup and config is required when printing to PDF
  349. if( isPrintingPDF() ) {
  350. removeEventListeners();
  351. // The document needs to have loaded for the PDF layout
  352. // measurements to be accurate
  353. if( document.readyState === 'complete' ) {
  354. setupPDF();
  355. }
  356. else {
  357. window.addEventListener( 'load', setupPDF );
  358. }
  359. }
  360. }
  361. /**
  362. * Finds and stores references to DOM elements which are
  363. * required by the presentation. If a required element is
  364. * not found, it is created.
  365. */
  366. function setupDOM() {
  367. // Prevent transitions while we're loading
  368. dom.slides.classList.add( 'no-transition' );
  369. // Background element
  370. dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
  371. // Progress bar
  372. dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
  373. dom.progressbar = dom.progress.querySelector( 'span' );
  374. // Arrow controls
  375. createSingletonNode( dom.wrapper, 'aside', 'controls',
  376. '<button class="navigate-left" aria-label="previous slide"></button>' +
  377. '<button class="navigate-right" aria-label="next slide"></button>' +
  378. '<button class="navigate-up" aria-label="above slide"></button>' +
  379. '<button class="navigate-down" aria-label="below slide"></button>' );
  380. // Slide number
  381. dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
  382. // Element containing notes that are visible to the audience
  383. dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
  384. dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
  385. dom.speakerNotes.setAttribute( 'tabindex', '0' );
  386. // Overlay graphic which is displayed during the paused mode
  387. createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
  388. // Cache references to elements
  389. dom.controls = document.querySelector( '.reveal .controls' );
  390. dom.wrapper.setAttribute( 'role', 'application' );
  391. // There can be multiple instances of controls throughout the page
  392. dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
  393. dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
  394. dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
  395. dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
  396. dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
  397. dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
  398. dom.statusDiv = createStatusDiv();
  399. }
  400. /**
  401. * Creates a hidden div with role aria-live to announce the
  402. * current slide content. Hide the div off-screen to make it
  403. * available only to Assistive Technologies.
  404. */
  405. function createStatusDiv() {
  406. var statusDiv = document.getElementById( 'aria-status-div' );
  407. if( !statusDiv ) {
  408. statusDiv = document.createElement( 'div' );
  409. statusDiv.style.position = 'absolute';
  410. statusDiv.style.height = '1px';
  411. statusDiv.style.width = '1px';
  412. statusDiv.style.overflow ='hidden';
  413. statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
  414. statusDiv.setAttribute( 'id', 'aria-status-div' );
  415. statusDiv.setAttribute( 'aria-live', 'polite' );
  416. statusDiv.setAttribute( 'aria-atomic','true' );
  417. dom.wrapper.appendChild( statusDiv );
  418. }
  419. return statusDiv;
  420. }
  421. /**
  422. * Converts the given HTML element into a string of text
  423. * that can be announced to a screen reader. Hidden
  424. * elements are excluded.
  425. */
  426. function getStatusText( node ) {
  427. var text = '';
  428. // Text node
  429. if( node.nodeType === 3 ) {
  430. text += node.textContent;
  431. }
  432. // Element node
  433. else if( node.nodeType === 1 ) {
  434. var isAriaHidden = node.getAttribute( 'aria-hidden' );
  435. var isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
  436. if( isAriaHidden !== 'true' && !isDisplayHidden ) {
  437. toArray( node.childNodes ).forEach( function( child ) {
  438. text += getStatusText( child );
  439. } );
  440. }
  441. }
  442. return text;
  443. }
  444. /**
  445. * Configures the presentation for printing to a static
  446. * PDF.
  447. */
  448. function setupPDF() {
  449. var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
  450. // Dimensions of the PDF pages
  451. var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
  452. pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
  453. // Dimensions of slides within the pages
  454. var slideWidth = slideSize.width,
  455. slideHeight = slideSize.height;
  456. // Let the browser know what page size we want to print
  457. injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' );
  458. // Limit the size of certain elements to the dimensions of the slide
  459. injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
  460. document.body.classList.add( 'print-pdf' );
  461. document.body.style.width = pageWidth + 'px';
  462. document.body.style.height = pageHeight + 'px';
  463. // Add each slide's index as attributes on itself, we need these
  464. // indices to generate slide numbers below
  465. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  466. hslide.setAttribute( 'data-index-h', h );
  467. if( hslide.classList.contains( 'stack' ) ) {
  468. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  469. vslide.setAttribute( 'data-index-h', h );
  470. vslide.setAttribute( 'data-index-v', v );
  471. } );
  472. }
  473. } );
  474. // Slide and slide background layout
  475. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  476. // Vertical stacks are not centred since their section
  477. // children will be
  478. if( slide.classList.contains( 'stack' ) === false ) {
  479. // Center the slide inside of the page, giving the slide some margin
  480. var left = ( pageWidth - slideWidth ) / 2,
  481. top = ( pageHeight - slideHeight ) / 2;
  482. var contentHeight = slide.scrollHeight;
  483. var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
  484. // Adhere to configured pages per slide limit
  485. numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
  486. // Center slides vertically
  487. if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
  488. top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
  489. }
  490. // Wrap the slide in a page element and hide its overflow
  491. // so that no page ever flows onto another
  492. var page = document.createElement( 'div' );
  493. page.className = 'pdf-page';
  494. page.style.height = ( pageHeight * numberOfPages ) + 'px';
  495. slide.parentNode.insertBefore( page, slide );
  496. page.appendChild( slide );
  497. // Position the slide inside of the page
  498. slide.style.left = left + 'px';
  499. slide.style.top = top + 'px';
  500. slide.style.width = slideWidth + 'px';
  501. if( slide.slideBackgroundElement ) {
  502. page.insertBefore( slide.slideBackgroundElement, slide );
  503. }
  504. // Inject notes if `showNotes` is enabled
  505. if( config.showNotes ) {
  506. // Are there notes for this slide?
  507. var notes = getSlideNotes( slide );
  508. if( notes ) {
  509. var notesSpacing = 8;
  510. var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
  511. var notesElement = document.createElement( 'div' );
  512. notesElement.classList.add( 'speaker-notes' );
  513. notesElement.classList.add( 'speaker-notes-pdf' );
  514. notesElement.setAttribute( 'data-layout', notesLayout );
  515. notesElement.innerHTML = notes;
  516. if( notesLayout === 'separate-page' ) {
  517. page.parentNode.insertBefore( notesElement, page.nextSibling );
  518. }
  519. else {
  520. notesElement.style.left = notesSpacing + 'px';
  521. notesElement.style.bottom = notesSpacing + 'px';
  522. notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
  523. page.appendChild( notesElement );
  524. }
  525. }
  526. }
  527. // Inject slide numbers if `slideNumbers` are enabled
  528. if( config.slideNumber ) {
  529. var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1,
  530. slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1;
  531. var numberElement = document.createElement( 'div' );
  532. numberElement.classList.add( 'slide-number' );
  533. numberElement.classList.add( 'slide-number-pdf' );
  534. numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV );
  535. page.appendChild( numberElement );
  536. }
  537. }
  538. } );
  539. // Show all fragments
  540. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
  541. fragment.classList.add( 'visible' );
  542. } );
  543. }
  544. /**
  545. * This is an unfortunate necessity. Some actions – such as
  546. * an input field being focused in an iframe or using the
  547. * keyboard to expand text selection beyond the bounds of
  548. * a slide – can trigger our content to be pushed out of view.
  549. * This scrolling can not be prevented by hiding overflow in
  550. * CSS (we already do) so we have to resort to repeatedly
  551. * checking if the slides have been offset :(
  552. */
  553. function setupScrollPrevention() {
  554. setInterval( function() {
  555. if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
  556. dom.wrapper.scrollTop = 0;
  557. dom.wrapper.scrollLeft = 0;
  558. }
  559. }, 1000 );
  560. }
  561. /**
  562. * Creates an HTML element and returns a reference to it.
  563. * If the element already exists the existing instance will
  564. * be returned.
  565. */
  566. function createSingletonNode( container, tagname, classname, innerHTML ) {
  567. // Find all nodes matching the description
  568. var nodes = container.querySelectorAll( '.' + classname );
  569. // Check all matches to find one which is a direct child of
  570. // the specified container
  571. for( var i = 0; i < nodes.length; i++ ) {
  572. var testNode = nodes[i];
  573. if( testNode.parentNode === container ) {
  574. return testNode;
  575. }
  576. }
  577. // If no node was found, create it now
  578. var node = document.createElement( tagname );
  579. node.classList.add( classname );
  580. if( typeof innerHTML === 'string' ) {
  581. node.innerHTML = innerHTML;
  582. }
  583. container.appendChild( node );
  584. return node;
  585. }
  586. /**
  587. * Creates the slide background elements and appends them
  588. * to the background container. One element is created per
  589. * slide no matter if the given slide has visible background.
  590. */
  591. function createBackgrounds() {
  592. var printMode = isPrintingPDF();
  593. // Clear prior backgrounds
  594. dom.background.innerHTML = '';
  595. dom.background.classList.add( 'no-transition' );
  596. // Iterate over all horizontal slides
  597. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
  598. var backgroundStack = createBackground( slideh, dom.background );
  599. // Iterate over all vertical slides
  600. toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
  601. createBackground( slidev, backgroundStack );
  602. backgroundStack.classList.add( 'stack' );
  603. } );
  604. } );
  605. // Add parallax background if specified
  606. if( config.parallaxBackgroundImage ) {
  607. dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
  608. dom.background.style.backgroundSize = config.parallaxBackgroundSize;
  609. // Make sure the below properties are set on the element - these properties are
  610. // needed for proper transitions to be set on the element via CSS. To remove
  611. // annoying background slide-in effect when the presentation starts, apply
  612. // these properties after short time delay
  613. setTimeout( function() {
  614. dom.wrapper.classList.add( 'has-parallax-background' );
  615. }, 1 );
  616. }
  617. else {
  618. dom.background.style.backgroundImage = '';
  619. dom.wrapper.classList.remove( 'has-parallax-background' );
  620. }
  621. }
  622. /**
  623. * Creates a background for the given slide.
  624. *
  625. * @param {HTMLElement} slide
  626. * @param {HTMLElement} container The element that the background
  627. * should be appended to
  628. */
  629. function createBackground( slide, container ) {
  630. var data = {
  631. background: slide.getAttribute( 'data-background' ),
  632. backgroundSize: slide.getAttribute( 'data-background-size' ),
  633. backgroundImage: slide.getAttribute( 'data-background-image' ),
  634. backgroundVideo: slide.getAttribute( 'data-background-video' ),
  635. backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
  636. backgroundColor: slide.getAttribute( 'data-background-color' ),
  637. backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
  638. backgroundPosition: slide.getAttribute( 'data-background-position' ),
  639. backgroundTransition: slide.getAttribute( 'data-background-transition' )
  640. };
  641. var element = document.createElement( 'div' );
  642. // Carry over custom classes from the slide to the background
  643. element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
  644. if( data.background ) {
  645. // Auto-wrap image urls in url(...)
  646. if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
  647. slide.setAttribute( 'data-background-image', data.background );
  648. }
  649. else {
  650. element.style.background = data.background;
  651. }
  652. }
  653. // Create a hash for this combination of background settings.
  654. // This is used to determine when two slide backgrounds are
  655. // the same.
  656. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
  657. element.setAttribute( 'data-background-hash', data.background +
  658. data.backgroundSize +
  659. data.backgroundImage +
  660. data.backgroundVideo +
  661. data.backgroundIframe +
  662. data.backgroundColor +
  663. data.backgroundRepeat +
  664. data.backgroundPosition +
  665. data.backgroundTransition );
  666. }
  667. // Additional and optional background properties
  668. if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
  669. if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
  670. if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
  671. if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
  672. if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
  673. container.appendChild( element );
  674. // If backgrounds are being recreated, clear old classes
  675. slide.classList.remove( 'has-dark-background' );
  676. slide.classList.remove( 'has-light-background' );
  677. slide.slideBackgroundElement = element;
  678. // If this slide has a background color, add a class that
  679. // signals if it is light or dark. If the slide has no background
  680. // color, no class will be set
  681. var computedBackgroundStyle = window.getComputedStyle( element );
  682. if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
  683. var rgb = colorToRgb( computedBackgroundStyle.backgroundColor );
  684. // Ignore fully transparent backgrounds. Some browsers return
  685. // rgba(0,0,0,0) when reading the computed background color of
  686. // an element with no background
  687. if( rgb && rgb.a !== 0 ) {
  688. if( colorBrightness( computedBackgroundStyle.backgroundColor ) < 128 ) {
  689. slide.classList.add( 'has-dark-background' );
  690. }
  691. else {
  692. slide.classList.add( 'has-light-background' );
  693. }
  694. }
  695. }
  696. return element;
  697. }
  698. /**
  699. * Registers a listener to postMessage events, this makes it
  700. * possible to call all reveal.js API methods from another
  701. * window. For example:
  702. *
  703. * revealWindow.postMessage( JSON.stringify({
  704. * method: 'slide',
  705. * args: [ 2 ]
  706. * }), '*' );
  707. */
  708. function setupPostMessage() {
  709. if( config.postMessage ) {
  710. window.addEventListener( 'message', function ( event ) {
  711. var data = event.data;
  712. // Make sure we're dealing with JSON
  713. if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
  714. data = JSON.parse( data );
  715. // Check if the requested method can be found
  716. if( data.method && typeof Reveal[data.method] === 'function' ) {
  717. Reveal[data.method].apply( Reveal, data.args );
  718. }
  719. }
  720. }, false );
  721. }
  722. }
  723. /**
  724. * Applies the configuration settings from the config
  725. * object. May be called multiple times.
  726. */
  727. function configure( options ) {
  728. var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
  729. dom.wrapper.classList.remove( config.transition );
  730. // New config options may be passed when this method
  731. // is invoked through the API after initialization
  732. if( typeof options === 'object' ) extend( config, options );
  733. // Force linear transition based on browser capabilities
  734. if( features.transforms3d === false ) config.transition = 'linear';
  735. dom.wrapper.classList.add( config.transition );
  736. dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
  737. dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
  738. dom.controls.style.display = config.controls ? 'block' : 'none';
  739. dom.progress.style.display = config.progress ? 'block' : 'none';
  740. dom.slideNumber.style.display = config.slideNumber && !isPrintingPDF() ? 'block' : 'none';
  741. if( config.shuffle ) {
  742. shuffle();
  743. }
  744. if( config.rtl ) {
  745. dom.wrapper.classList.add( 'rtl' );
  746. }
  747. else {
  748. dom.wrapper.classList.remove( 'rtl' );
  749. }
  750. if( config.center ) {
  751. dom.wrapper.classList.add( 'center' );
  752. }
  753. else {
  754. dom.wrapper.classList.remove( 'center' );
  755. }
  756. // Exit the paused mode if it was configured off
  757. if( config.pause === false ) {
  758. resume();
  759. }
  760. if( config.showNotes ) {
  761. dom.speakerNotes.classList.add( 'visible' );
  762. dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
  763. }
  764. else {
  765. dom.speakerNotes.classList.remove( 'visible' );
  766. }
  767. if( config.mouseWheel ) {
  768. document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  769. document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
  770. }
  771. else {
  772. document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
  773. document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
  774. }
  775. // Rolling 3D links
  776. if( config.rollingLinks ) {
  777. enableRollingLinks();
  778. }
  779. else {
  780. disableRollingLinks();
  781. }
  782. // Iframe link previews
  783. if( config.previewLinks ) {
  784. enablePreviewLinks();
  785. }
  786. else {
  787. disablePreviewLinks();
  788. enablePreviewLinks( '[data-preview-link]' );
  789. }
  790. // Remove existing auto-slide controls
  791. if( autoSlidePlayer ) {
  792. autoSlidePlayer.destroy();
  793. autoSlidePlayer = null;
  794. }
  795. // Generate auto-slide controls if needed
  796. if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
  797. autoSlidePlayer = new Playback( dom.wrapper, function() {
  798. return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
  799. } );
  800. autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
  801. autoSlidePaused = false;
  802. }
  803. // When fragments are turned off they should be visible
  804. if( config.fragments === false ) {
  805. toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
  806. element.classList.add( 'visible' );
  807. element.classList.remove( 'current-fragment' );
  808. } );
  809. }
  810. sync();
  811. }
  812. /**
  813. * Binds all event listeners.
  814. */
  815. function addEventListeners() {
  816. eventsAreBound = true;
  817. window.addEventListener( 'hashchange', onWindowHashChange, false );
  818. window.addEventListener( 'resize', onWindowResize, false );
  819. if( config.touch ) {
  820. dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
  821. dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
  822. dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
  823. // Support pointer-style touch interaction as well
  824. if( window.navigator.pointerEnabled ) {
  825. // IE 11 uses un-prefixed version of pointer events
  826. dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
  827. dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
  828. dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
  829. }
  830. else if( window.navigator.msPointerEnabled ) {
  831. // IE 10 uses prefixed version of pointer events
  832. dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
  833. dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
  834. dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
  835. }
  836. }
  837. if( config.keyboard ) {
  838. document.addEventListener( 'keydown', onDocumentKeyDown, false );
  839. document.addEventListener( 'keypress', onDocumentKeyPress, false );
  840. }
  841. if( config.progress && dom.progress ) {
  842. dom.progress.addEventListener( 'click', onProgressClicked, false );
  843. }
  844. if( config.focusBodyOnPageVisibilityChange ) {
  845. var visibilityChange;
  846. if( 'hidden' in document ) {
  847. visibilityChange = 'visibilitychange';
  848. }
  849. else if( 'msHidden' in document ) {
  850. visibilityChange = 'msvisibilitychange';
  851. }
  852. else if( 'webkitHidden' in document ) {
  853. visibilityChange = 'webkitvisibilitychange';
  854. }
  855. if( visibilityChange ) {
  856. document.addEventListener( visibilityChange, onPageVisibilityChange, false );
  857. }
  858. }
  859. // Listen to both touch and click events, in case the device
  860. // supports both
  861. var pointerEvents = [ 'touchstart', 'click' ];
  862. // Only support touch for Android, fixes double navigations in
  863. // stock browser
  864. if( UA.match( /android/gi ) ) {
  865. pointerEvents = [ 'touchstart' ];
  866. }
  867. pointerEvents.forEach( function( eventName ) {
  868. dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
  869. dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
  870. dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
  871. dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
  872. dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
  873. dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
  874. } );
  875. }
  876. /**
  877. * Unbinds all event listeners.
  878. */
  879. function removeEventListeners() {
  880. eventsAreBound = false;
  881. document.removeEventListener( 'keydown', onDocumentKeyDown, false );
  882. document.removeEventListener( 'keypress', onDocumentKeyPress, false );
  883. window.removeEventListener( 'hashchange', onWindowHashChange, false );
  884. window.removeEventListener( 'resize', onWindowResize, false );
  885. dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
  886. dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
  887. dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
  888. // IE11
  889. if( window.navigator.pointerEnabled ) {
  890. dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
  891. dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
  892. dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
  893. }
  894. // IE10
  895. else if( window.navigator.msPointerEnabled ) {
  896. dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
  897. dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
  898. dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
  899. }
  900. if ( config.progress && dom.progress ) {
  901. dom.progress.removeEventListener( 'click', onProgressClicked, false );
  902. }
  903. [ 'touchstart', 'click' ].forEach( function( eventName ) {
  904. dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
  905. dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
  906. dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
  907. dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
  908. dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
  909. dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
  910. } );
  911. }
  912. /**
  913. * Extend object a with the properties of object b.
  914. * If there's a conflict, object b takes precedence.
  915. */
  916. function extend( a, b ) {
  917. for( var i in b ) {
  918. a[ i ] = b[ i ];
  919. }
  920. }
  921. /**
  922. * Converts the target object to an array.
  923. */
  924. function toArray( o ) {
  925. return Array.prototype.slice.call( o );
  926. }
  927. /**
  928. * Utility for deserializing a value.
  929. */
  930. function deserialize( value ) {
  931. if( typeof value === 'string' ) {
  932. if( value === 'null' ) return null;
  933. else if( value === 'true' ) return true;
  934. else if( value === 'false' ) return false;
  935. else if( value.match( /^\d+$/ ) ) return parseFloat( value );
  936. }
  937. return value;
  938. }
  939. /**
  940. * Measures the distance in pixels between point a
  941. * and point b.
  942. *
  943. * @param {Object} a point with x/y properties
  944. * @param {Object} b point with x/y properties
  945. */
  946. function distanceBetween( a, b ) {
  947. var dx = a.x - b.x,
  948. dy = a.y - b.y;
  949. return Math.sqrt( dx*dx + dy*dy );
  950. }
  951. /**
  952. * Applies a CSS transform to the target element.
  953. */
  954. function transformElement( element, transform ) {
  955. element.style.WebkitTransform = transform;
  956. element.style.MozTransform = transform;
  957. element.style.msTransform = transform;
  958. element.style.transform = transform;
  959. }
  960. /**
  961. * Applies CSS transforms to the slides container. The container
  962. * is transformed from two separate sources: layout and the overview
  963. * mode.
  964. */
  965. function transformSlides( transforms ) {
  966. // Pick up new transforms from arguments
  967. if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
  968. if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
  969. // Apply the transforms to the slides container
  970. if( slidesTransform.layout ) {
  971. transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
  972. }
  973. else {
  974. transformElement( dom.slides, slidesTransform.overview );
  975. }
  976. }
  977. /**
  978. * Injects the given CSS styles into the DOM.
  979. */
  980. function injectStyleSheet( value ) {
  981. var tag = document.createElement( 'style' );
  982. tag.type = 'text/css';
  983. if( tag.styleSheet ) {
  984. tag.styleSheet.cssText = value;
  985. }
  986. else {
  987. tag.appendChild( document.createTextNode( value ) );
  988. }
  989. document.getElementsByTagName( 'head' )[0].appendChild( tag );
  990. }
  991. /**
  992. * Find the closest parent that matches the given
  993. * selector.
  994. *
  995. * @param {HTMLElement} target The child element
  996. * @param {String} selector The CSS selector to match
  997. * the parents against
  998. *
  999. * @return {HTMLElement} The matched parent or null
  1000. * if no matching parent was found
  1001. */
  1002. function closestParent( target, selector ) {
  1003. var parent = target.parentNode;
  1004. while( parent ) {
  1005. // There's some overhead doing this each time, we don't
  1006. // want to rewrite the element prototype but should still
  1007. // be enough to feature detect once at startup...
  1008. var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
  1009. // If we find a match, we're all set
  1010. if( matchesMethod && matchesMethod.call( parent, selector ) ) {
  1011. return parent;
  1012. }
  1013. // Keep searching
  1014. parent = parent.parentNode;
  1015. }
  1016. return null;
  1017. }
  1018. /**
  1019. * Converts various color input formats to an {r:0,g:0,b:0} object.
  1020. *
  1021. * @param {String} color The string representation of a color,
  1022. * the following formats are supported:
  1023. * - #000
  1024. * - #000000
  1025. * - rgb(0,0,0)
  1026. */
  1027. function colorToRgb( color ) {
  1028. var hex3 = color.match( /^#([0-9a-f]{3})$/i );
  1029. if( hex3 && hex3[1] ) {
  1030. hex3 = hex3[1];
  1031. return {
  1032. r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
  1033. g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
  1034. b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
  1035. };
  1036. }
  1037. var hex6 = color.match( /^#([0-9a-f]{6})$/i );
  1038. if( hex6 && hex6[1] ) {
  1039. hex6 = hex6[1];
  1040. return {
  1041. r: parseInt( hex6.substr( 0, 2 ), 16 ),
  1042. g: parseInt( hex6.substr( 2, 2 ), 16 ),
  1043. b: parseInt( hex6.substr( 4, 2 ), 16 )
  1044. };
  1045. }
  1046. var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
  1047. if( rgb ) {
  1048. return {
  1049. r: parseInt( rgb[1], 10 ),
  1050. g: parseInt( rgb[2], 10 ),
  1051. b: parseInt( rgb[3], 10 )
  1052. };
  1053. }
  1054. var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
  1055. if( rgba ) {
  1056. return {
  1057. r: parseInt( rgba[1], 10 ),
  1058. g: parseInt( rgba[2], 10 ),
  1059. b: parseInt( rgba[3], 10 ),
  1060. a: parseFloat( rgba[4] )
  1061. };
  1062. }
  1063. return null;
  1064. }
  1065. /**
  1066. * Calculates brightness on a scale of 0-255.
  1067. *
  1068. * @param color See colorStringToRgb for supported formats.
  1069. */
  1070. function colorBrightness( color ) {
  1071. if( typeof color === 'string' ) color = colorToRgb( color );
  1072. if( color ) {
  1073. return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
  1074. }
  1075. return null;
  1076. }
  1077. /**
  1078. * Returns the remaining height within the parent of the
  1079. * target element.
  1080. *
  1081. * remaining height = [ configured parent height ] - [ current parent height ]
  1082. */
  1083. function getRemainingHeight( element, height ) {
  1084. height = height || 0;
  1085. if( element ) {
  1086. var newHeight, oldHeight = element.style.height;
  1087. // Change the .stretch element height to 0 in order find the height of all
  1088. // the other elements
  1089. element.style.height = '0px';
  1090. newHeight = height - element.parentNode.offsetHeight;
  1091. // Restore the old height, just in case
  1092. element.style.height = oldHeight + 'px';
  1093. return newHeight;
  1094. }
  1095. return height;
  1096. }
  1097. /**
  1098. * Checks if this instance is being used to print a PDF.
  1099. */
  1100. function isPrintingPDF() {
  1101. return ( /print-pdf/gi ).test( window.location.search );
  1102. }
  1103. /**
  1104. * Hides the address bar if we're on a mobile device.
  1105. */
  1106. function hideAddressBar() {
  1107. if( config.hideAddressBar && isMobileDevice ) {
  1108. // Events that should trigger the address bar to hide
  1109. window.addEventListener( 'load', removeAddressBar, false );
  1110. window.addEventListener( 'orientationchange', removeAddressBar, false );
  1111. }
  1112. }
  1113. /**
  1114. * Causes the address bar to hide on mobile devices,
  1115. * more vertical space ftw.
  1116. */
  1117. function removeAddressBar() {
  1118. setTimeout( function() {
  1119. window.scrollTo( 0, 1 );
  1120. }, 10 );
  1121. }
  1122. /**
  1123. * Dispatches an event of the specified type from the
  1124. * reveal DOM element.
  1125. */
  1126. function dispatchEvent( type, args ) {
  1127. var event = document.createEvent( 'HTMLEvents', 1, 2 );
  1128. event.initEvent( type, true, true );
  1129. extend( event, args );
  1130. dom.wrapper.dispatchEvent( event );
  1131. // If we're in an iframe, post each reveal.js event to the
  1132. // parent window. Used by the notes plugin
  1133. if( config.postMessageEvents && window.parent !== window.self ) {
  1134. window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
  1135. }
  1136. }
  1137. /**
  1138. * Wrap all links in 3D goodness.
  1139. */
  1140. function enableRollingLinks() {
  1141. if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
  1142. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
  1143. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1144. var anchor = anchors[i];
  1145. if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
  1146. var span = document.createElement('span');
  1147. span.setAttribute('data-title', anchor.text);
  1148. span.innerHTML = anchor.innerHTML;
  1149. anchor.classList.add( 'roll' );
  1150. anchor.innerHTML = '';
  1151. anchor.appendChild(span);
  1152. }
  1153. }
  1154. }
  1155. }
  1156. /**
  1157. * Unwrap all 3D links.
  1158. */
  1159. function disableRollingLinks() {
  1160. var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
  1161. for( var i = 0, len = anchors.length; i < len; i++ ) {
  1162. var anchor = anchors[i];
  1163. var span = anchor.querySelector( 'span' );
  1164. if( span ) {
  1165. anchor.classList.remove( 'roll' );
  1166. anchor.innerHTML = span.innerHTML;
  1167. }
  1168. }
  1169. }
  1170. /**
  1171. * Bind preview frame links.
  1172. */
  1173. function enablePreviewLinks( selector ) {
  1174. var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
  1175. anchors.forEach( function( element ) {
  1176. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1177. element.addEventListener( 'click', onPreviewLinkClicked, false );
  1178. }
  1179. } );
  1180. }
  1181. /**
  1182. * Unbind preview frame links.
  1183. */
  1184. function disablePreviewLinks() {
  1185. var anchors = toArray( document.querySelectorAll( 'a' ) );
  1186. anchors.forEach( function( element ) {
  1187. if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
  1188. element.removeEventListener( 'click', onPreviewLinkClicked, false );
  1189. }
  1190. } );
  1191. }
  1192. /**
  1193. * Opens a preview window for the target URL.
  1194. */
  1195. function showPreview( url ) {
  1196. closeOverlay();
  1197. dom.overlay = document.createElement( 'div' );
  1198. dom.overlay.classList.add( 'overlay' );
  1199. dom.overlay.classList.add( 'overlay-preview' );
  1200. dom.wrapper.appendChild( dom.overlay );
  1201. dom.overlay.innerHTML = [
  1202. '<header>',
  1203. '<a class="close" href="#"><span class="icon"></span></a>',
  1204. '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
  1205. '</header>',
  1206. '<div class="spinner"></div>',
  1207. '<div class="viewport">',
  1208. '<iframe src="'+ url +'"></iframe>',
  1209. '</div>'
  1210. ].join('');
  1211. dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
  1212. dom.overlay.classList.add( 'loaded' );
  1213. }, false );
  1214. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1215. closeOverlay();
  1216. event.preventDefault();
  1217. }, false );
  1218. dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
  1219. closeOverlay();
  1220. }, false );
  1221. setTimeout( function() {
  1222. dom.overlay.classList.add( 'visible' );
  1223. }, 1 );
  1224. }
  1225. /**
  1226. * Opens a overlay window with help material.
  1227. */
  1228. function showHelp() {
  1229. if( config.help ) {
  1230. closeOverlay();
  1231. dom.overlay = document.createElement( 'div' );
  1232. dom.overlay.classList.add( 'overlay' );
  1233. dom.overlay.classList.add( 'overlay-help' );
  1234. dom.wrapper.appendChild( dom.overlay );
  1235. var html = '<p class="title">Keyboard Shortcuts</p><br/>';
  1236. html += '<table><th>KEY</th><th>ACTION</th>';
  1237. for( var key in keyboardShortcuts ) {
  1238. html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
  1239. }
  1240. html += '</table>';
  1241. dom.overlay.innerHTML = [
  1242. '<header>',
  1243. '<a class="close" href="#"><span class="icon"></span></a>',
  1244. '</header>',
  1245. '<div class="viewport">',
  1246. '<div class="viewport-inner">'+ html +'</div>',
  1247. '</div>'
  1248. ].join('');
  1249. dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
  1250. closeOverlay();
  1251. event.preventDefault();
  1252. }, false );
  1253. setTimeout( function() {
  1254. dom.overlay.classList.add( 'visible' );
  1255. }, 1 );
  1256. }
  1257. }
  1258. /**
  1259. * Closes any currently open overlay.
  1260. */
  1261. function closeOverlay() {
  1262. if( dom.overlay ) {
  1263. dom.overlay.parentNode.removeChild( dom.overlay );
  1264. dom.overlay = null;
  1265. }
  1266. }
  1267. /**
  1268. * Applies JavaScript-controlled layout rules to the
  1269. * presentation.
  1270. */
  1271. function layout() {
  1272. if( dom.wrapper && !isPrintingPDF() ) {
  1273. var size = getComputedSlideSize();
  1274. // Layout the contents of the slides
  1275. layoutSlideContents( config.width, config.height );
  1276. dom.slides.style.width = size.width + 'px';
  1277. dom.slides.style.height = size.height + 'px';
  1278. // Determine scale of content to fit within available space
  1279. scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
  1280. // Respect max/min scale settings
  1281. scale = Math.max( scale, config.minScale );
  1282. scale = Math.min( scale, config.maxScale );
  1283. // Don't apply any scaling styles if scale is 1
  1284. if( scale === 1 ) {
  1285. dom.slides.style.zoom = '';
  1286. dom.slides.style.left = '';
  1287. dom.slides.style.top = '';
  1288. dom.slides.style.bottom = '';
  1289. dom.slides.style.right = '';
  1290. transformSlides( { layout: '' } );
  1291. }
  1292. else {
  1293. // Prefer zoom for scaling up so that content remains crisp.
  1294. // Don't use zoom to scale down since that can lead to shifts
  1295. // in text layout/line breaks.
  1296. if( scale > 1 && features.zoom ) {
  1297. dom.slides.style.zoom = scale;
  1298. dom.slides.style.left = '';
  1299. dom.slides.style.top = '';
  1300. dom.slides.style.bottom = '';
  1301. dom.slides.style.right = '';
  1302. transformSlides( { layout: '' } );
  1303. }
  1304. // Apply scale transform as a fallback
  1305. else {
  1306. dom.slides.style.zoom = '';
  1307. dom.slides.style.left = '50%';
  1308. dom.slides.style.top = '50%';
  1309. dom.slides.style.bottom = 'auto';
  1310. dom.slides.style.right = 'auto';
  1311. transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
  1312. }
  1313. }
  1314. // Select all slides, vertical and horizontal
  1315. var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
  1316. for( var i = 0, len = slides.length; i < len; i++ ) {
  1317. var slide = slides[ i ];
  1318. // Don't bother updating invisible slides
  1319. if( slide.style.display === 'none' ) {
  1320. continue;
  1321. }
  1322. if( config.center || slide.classList.contains( 'center' ) ) {
  1323. // Vertical stacks are not centred since their section
  1324. // children will be
  1325. if( slide.classList.contains( 'stack' ) ) {
  1326. slide.style.top = 0;
  1327. }
  1328. else {
  1329. slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
  1330. }
  1331. }
  1332. else {
  1333. slide.style.top = '';
  1334. }
  1335. }
  1336. updateProgress();
  1337. updateParallax();
  1338. }
  1339. }
  1340. /**
  1341. * Applies layout logic to the contents of all slides in
  1342. * the presentation.
  1343. */
  1344. function layoutSlideContents( width, height ) {
  1345. // Handle sizing of elements with the 'stretch' class
  1346. toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
  1347. // Determine how much vertical space we can use
  1348. var remainingHeight = getRemainingHeight( element, height );
  1349. // Consider the aspect ratio of media elements
  1350. if( /(img|video)/gi.test( element.nodeName ) ) {
  1351. var nw = element.naturalWidth || element.videoWidth,
  1352. nh = element.naturalHeight || element.videoHeight;
  1353. var es = Math.min( width / nw, remainingHeight / nh );
  1354. element.style.width = ( nw * es ) + 'px';
  1355. element.style.height = ( nh * es ) + 'px';
  1356. }
  1357. else {
  1358. element.style.width = width + 'px';
  1359. element.style.height = remainingHeight + 'px';
  1360. }
  1361. } );
  1362. }
  1363. /**
  1364. * Calculates the computed pixel size of our slides. These
  1365. * values are based on the width and height configuration
  1366. * options.
  1367. */
  1368. function getComputedSlideSize( presentationWidth, presentationHeight ) {
  1369. var size = {
  1370. // Slide size
  1371. width: config.width,
  1372. height: config.height,
  1373. // Presentation size
  1374. presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
  1375. presentationHeight: presentationHeight || dom.wrapper.offsetHeight
  1376. };
  1377. // Reduce available space by margin
  1378. size.presentationWidth -= ( size.presentationWidth * config.margin );
  1379. size.presentationHeight -= ( size.presentationHeight * config.margin );
  1380. // Slide width may be a percentage of available width
  1381. if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
  1382. size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
  1383. }
  1384. // Slide height may be a percentage of available height
  1385. if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
  1386. size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
  1387. }
  1388. return size;
  1389. }
  1390. /**
  1391. * Stores the vertical index of a stack so that the same
  1392. * vertical slide can be selected when navigating to and
  1393. * from the stack.
  1394. *
  1395. * @param {HTMLElement} stack The vertical stack element
  1396. * @param {int} v Index to memorize
  1397. */
  1398. function setPreviousVerticalIndex( stack, v ) {
  1399. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
  1400. stack.setAttribute( 'data-previous-indexv', v || 0 );
  1401. }
  1402. }
  1403. /**
  1404. * Retrieves the vertical index which was stored using
  1405. * #setPreviousVerticalIndex() or 0 if no previous index
  1406. * exists.
  1407. *
  1408. * @param {HTMLElement} stack The vertical stack element
  1409. */
  1410. function getPreviousVerticalIndex( stack ) {
  1411. if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
  1412. // Prefer manually defined start-indexv
  1413. var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
  1414. return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
  1415. }
  1416. return 0;
  1417. }
  1418. /**
  1419. * Displays the overview of slides (quick nav) by scaling
  1420. * down and arranging all slide elements.
  1421. */
  1422. function activateOverview() {
  1423. // Only proceed if enabled in config
  1424. if( config.overview && !isOverview() ) {
  1425. overview = true;
  1426. dom.wrapper.classList.add( 'overview' );
  1427. dom.wrapper.classList.remove( 'overview-deactivating' );
  1428. if( features.overviewTransitions ) {
  1429. setTimeout( function() {
  1430. dom.wrapper.classList.add( 'overview-animated' );
  1431. }, 1 );
  1432. }
  1433. // Don't auto-slide while in overview mode
  1434. cancelAutoSlide();
  1435. // Move the backgrounds element into the slide container to
  1436. // that the same scaling is applied
  1437. dom.slides.appendChild( dom.background );
  1438. // Clicking on an overview slide navigates to it
  1439. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1440. if( !slide.classList.contains( 'stack' ) ) {
  1441. slide.addEventListener( 'click', onOverviewSlideClicked, true );
  1442. }
  1443. } );
  1444. // Calculate slide sizes
  1445. var margin = 70;
  1446. var slideSize = getComputedSlideSize();
  1447. overviewSlideWidth = slideSize.width + margin;
  1448. overviewSlideHeight = slideSize.height + margin;
  1449. // Reverse in RTL mode
  1450. if( config.rtl ) {
  1451. overviewSlideWidth = -overviewSlideWidth;
  1452. }
  1453. updateSlidesVisibility();
  1454. layoutOverview();
  1455. updateOverview();
  1456. layout();
  1457. // Notify observers of the overview showing
  1458. dispatchEvent( 'overviewshown', {
  1459. 'indexh': indexh,
  1460. 'indexv': indexv,
  1461. 'currentSlide': currentSlide
  1462. } );
  1463. }
  1464. }
  1465. /**
  1466. * Uses CSS transforms to position all slides in a grid for
  1467. * display inside of the overview mode.
  1468. */
  1469. function layoutOverview() {
  1470. // Layout slides
  1471. toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
  1472. hslide.setAttribute( 'data-index-h', h );
  1473. transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1474. if( hslide.classList.contains( 'stack' ) ) {
  1475. toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
  1476. vslide.setAttribute( 'data-index-h', h );
  1477. vslide.setAttribute( 'data-index-v', v );
  1478. transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1479. } );
  1480. }
  1481. } );
  1482. // Layout slide backgrounds
  1483. toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
  1484. transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
  1485. toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
  1486. transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
  1487. } );
  1488. } );
  1489. }
  1490. /**
  1491. * Moves the overview viewport to the current slides.
  1492. * Called each time the current slide changes.
  1493. */
  1494. function updateOverview() {
  1495. transformSlides( {
  1496. overview: [
  1497. 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
  1498. 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)',
  1499. 'translateZ('+ ( window.innerWidth < 400 ? -1000 : -2500 ) +'px)'
  1500. ].join( ' ' )
  1501. } );
  1502. }
  1503. /**
  1504. * Exits the slide overview and enters the currently
  1505. * active slide.
  1506. */
  1507. function deactivateOverview() {
  1508. // Only proceed if enabled in config
  1509. if( config.overview ) {
  1510. overview = false;
  1511. dom.wrapper.classList.remove( 'overview' );
  1512. dom.wrapper.classList.remove( 'overview-animated' );
  1513. // Temporarily add a class so that transitions can do different things
  1514. // depending on whether they are exiting/entering overview, or just
  1515. // moving from slide to slide
  1516. dom.wrapper.classList.add( 'overview-deactivating' );
  1517. setTimeout( function () {
  1518. dom.wrapper.classList.remove( 'overview-deactivating' );
  1519. }, 1 );
  1520. // Move the background element back out
  1521. dom.wrapper.appendChild( dom.background );
  1522. // Clean up changes made to slides
  1523. toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
  1524. transformElement( slide, '' );
  1525. slide.removeEventListener( 'click', onOverviewSlideClicked, true );
  1526. } );
  1527. // Clean up changes made to backgrounds
  1528. toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
  1529. transformElement( background, '' );
  1530. } );
  1531. transformSlides( { overview: '' } );
  1532. slide( indexh, indexv );
  1533. layout();
  1534. cueAutoSlide();
  1535. // Notify observers of the overview hiding
  1536. dispatchEvent( 'overviewhidden', {
  1537. 'indexh': indexh,
  1538. 'indexv': indexv,
  1539. 'currentSlide': currentSlide
  1540. } );
  1541. }
  1542. }
  1543. /**
  1544. * Toggles the slide overview mode on and off.
  1545. *
  1546. * @param {Boolean} override Optional flag which overrides the
  1547. * toggle logic and forcibly sets the desired state. True means
  1548. * overview is open, false means it's closed.
  1549. */
  1550. function toggleOverview( override ) {
  1551. if( typeof override === 'boolean' ) {
  1552. override ? activateOverview() : deactivateOverview();
  1553. }
  1554. else {
  1555. isOverview() ? deactivateOverview() : activateOverview();
  1556. }
  1557. }
  1558. /**
  1559. * Checks if the overview is currently active.
  1560. *
  1561. * @return {Boolean} true if the overview is active,
  1562. * false otherwise
  1563. */
  1564. function isOverview() {
  1565. return overview;
  1566. }
  1567. /**
  1568. * Checks if the current or specified slide is vertical
  1569. * (nested within another slide).
  1570. *
  1571. * @param {HTMLElement} slide [optional] The slide to check
  1572. * orientation of
  1573. */
  1574. function isVerticalSlide( slide ) {
  1575. // Prefer slide argument, otherwise use current slide
  1576. slide = slide ? slide : currentSlide;
  1577. return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
  1578. }
  1579. /**
  1580. * Handling the fullscreen functionality via the fullscreen API
  1581. *
  1582. * @see http://fullscreen.spec.whatwg.org/
  1583. * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
  1584. */
  1585. function enterFullscreen() {
  1586. var element = document.documentElement;
  1587. // Check which implementation is available
  1588. var requestMethod = element.requestFullscreen ||
  1589. element.webkitRequestFullscreen ||
  1590. element.webkitRequestFullScreen ||
  1591. element.mozRequestFullScreen ||
  1592. element.msRequestFullscreen;
  1593. if( requestMethod ) {
  1594. requestMethod.apply( element );
  1595. }
  1596. }
  1597. /**
  1598. * Enters the paused mode which fades everything on screen to
  1599. * black.
  1600. */
  1601. function pause() {
  1602. if( config.pause ) {
  1603. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1604. cancelAutoSlide();
  1605. dom.wrapper.classList.add( 'paused' );
  1606. if( wasPaused === false ) {
  1607. dispatchEvent( 'paused' );
  1608. }
  1609. }
  1610. }
  1611. /**
  1612. * Exits from the paused mode.
  1613. */
  1614. function resume() {
  1615. var wasPaused = dom.wrapper.classList.contains( 'paused' );
  1616. dom.wrapper.classList.remove( 'paused' );
  1617. cueAutoSlide();
  1618. if( wasPaused ) {
  1619. dispatchEvent( 'resumed' );
  1620. }
  1621. }
  1622. /**
  1623. * Toggles the paused mode on and off.
  1624. */
  1625. function togglePause( override ) {
  1626. if( typeof override === 'boolean' ) {
  1627. override ? pause() : resume();
  1628. }
  1629. else {
  1630. isPaused() ? resume() : pause();
  1631. }
  1632. }
  1633. /**
  1634. * Checks if we are currently in the paused mode.
  1635. */
  1636. function isPaused() {
  1637. return dom.wrapper.classList.contains( 'paused' );
  1638. }
  1639. /**
  1640. * Toggles the auto slide mode on and off.
  1641. *
  1642. * @param {Boolean} override Optional flag which sets the desired state.
  1643. * True means autoplay starts, false means it stops.
  1644. */
  1645. function toggleAutoSlide( override ) {
  1646. if( typeof override === 'boolean' ) {
  1647. override ? resumeAutoSlide() : pauseAutoSlide();
  1648. }
  1649. else {
  1650. autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
  1651. }
  1652. }
  1653. /**
  1654. * Checks if the auto slide mode is currently on.
  1655. */
  1656. function isAutoSliding() {
  1657. return !!( autoSlide && !autoSlidePaused );
  1658. }
  1659. /**
  1660. * Steps from the current point in the presentation to the
  1661. * slide which matches the specified horizontal and vertical
  1662. * indices.
  1663. *
  1664. * @param {int} h Horizontal index of the target slide
  1665. * @param {int} v Vertical index of the target slide
  1666. * @param {int} f Optional index of a fragment within the
  1667. * target slide to activate
  1668. * @param {int} o Optional origin for use in multimaster environments
  1669. */
  1670. function slide( h, v, f, o ) {
  1671. // Remember where we were at before
  1672. previousSlide = currentSlide;
  1673. // Query all horizontal slides in the deck
  1674. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  1675. // Abort if there are no slides
  1676. if( horizontalSlides.length === 0 ) return;
  1677. // If no vertical index is specified and the upcoming slide is a
  1678. // stack, resume at its previous vertical index
  1679. if( v === undefined && !isOverview() ) {
  1680. v = getPreviousVerticalIndex( horizontalSlides[ h ] );
  1681. }
  1682. // If we were on a vertical stack, remember what vertical index
  1683. // it was on so we can resume at the same position when returning
  1684. if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
  1685. setPreviousVerticalIndex( previousSlide.parentNode, indexv );
  1686. }
  1687. // Remember the state before this slide
  1688. var stateBefore = state.concat();
  1689. // Reset the state array
  1690. state.length = 0;
  1691. var indexhBefore = indexh || 0,
  1692. indexvBefore = indexv || 0;
  1693. // Activate and transition to the new slide
  1694. indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
  1695. indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
  1696. // Update the visibility of slides now that the indices have changed
  1697. updateSlidesVisibility();
  1698. layout();
  1699. // Apply the new state
  1700. stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  1701. // Check if this state existed on the previous slide. If it
  1702. // did, we will avoid adding it repeatedly
  1703. for( var j = 0; j < stateBefore.length; j++ ) {
  1704. if( stateBefore[j] === state[i] ) {
  1705. stateBefore.splice( j, 1 );
  1706. continue stateLoop;
  1707. }
  1708. }
  1709. document.documentElement.classList.add( state[i] );
  1710. // Dispatch custom event matching the state's name
  1711. dispatchEvent( state[i] );
  1712. }
  1713. // Clean up the remains of the previous state
  1714. while( stateBefore.length ) {
  1715. document.documentElement.classList.remove( stateBefore.pop() );
  1716. }
  1717. // Update the overview if it's currently active
  1718. if( isOverview() ) {
  1719. updateOverview();
  1720. }
  1721. // Find the current horizontal slide and any possible vertical slides
  1722. // within it
  1723. var currentHorizontalSlide = horizontalSlides[ indexh ],
  1724. currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
  1725. // Store references to the previous and current slides
  1726. currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
  1727. // Show fragment, if specified
  1728. if( typeof f !== 'undefined' ) {
  1729. navigateFragment( f );
  1730. }
  1731. // Dispatch an event if the slide changed
  1732. var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
  1733. if( slideChanged ) {
  1734. dispatchEvent( 'slidechanged', {
  1735. 'indexh': indexh,
  1736. 'indexv': indexv,
  1737. 'previousSlide': previousSlide,
  1738. 'currentSlide': currentSlide,
  1739. 'origin': o
  1740. } );
  1741. }
  1742. else {
  1743. // Ensure that the previous slide is never the same as the current
  1744. previousSlide = null;
  1745. }
  1746. // Solves an edge case where the previous slide maintains the
  1747. // 'present' class when navigating between adjacent vertical
  1748. // stacks
  1749. if( previousSlide ) {
  1750. previousSlide.classList.remove( 'present' );
  1751. previousSlide.setAttribute( 'aria-hidden', 'true' );
  1752. // Reset all slides upon navigate to home
  1753. // Issue: #285
  1754. if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
  1755. // Launch async task
  1756. setTimeout( function () {
  1757. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
  1758. for( i in slides ) {
  1759. if( slides[i] ) {
  1760. // Reset stack
  1761. setPreviousVerticalIndex( slides[i], 0 );
  1762. }
  1763. }
  1764. }, 0 );
  1765. }
  1766. }
  1767. // Handle embedded content
  1768. if( slideChanged || !previousSlide ) {
  1769. stopEmbeddedContent( previousSlide );
  1770. startEmbeddedContent( currentSlide );
  1771. }
  1772. // Announce the current slide contents, for screen readers
  1773. dom.statusDiv.textContent = getStatusText( currentSlide );
  1774. updateControls();
  1775. updateProgress();
  1776. updateBackground();
  1777. updateParallax();
  1778. updateSlideNumber();
  1779. updateNotes();
  1780. // Update the URL hash
  1781. writeURL();
  1782. cueAutoSlide();
  1783. }
  1784. /**
  1785. * Syncs the presentation with the current DOM. Useful
  1786. * when new slides or control elements are added or when
  1787. * the configuration has changed.
  1788. */
  1789. function sync() {
  1790. // Subscribe to input
  1791. removeEventListeners();
  1792. addEventListeners();
  1793. // Force a layout to make sure the current config is accounted for
  1794. layout();
  1795. // Reflect the current autoSlide value
  1796. autoSlide = config.autoSlide;
  1797. // Start auto-sliding if it's enabled
  1798. cueAutoSlide();
  1799. // Re-create the slide backgrounds
  1800. createBackgrounds();
  1801. // Write the current hash to the URL
  1802. writeURL();
  1803. sortAllFragments();
  1804. updateControls();
  1805. updateProgress();
  1806. updateBackground( true );
  1807. updateSlideNumber();
  1808. updateSlidesVisibility();
  1809. updateNotes();
  1810. formatEmbeddedContent();
  1811. startEmbeddedContent( currentSlide );
  1812. if( isOverview() ) {
  1813. layoutOverview();
  1814. }
  1815. }
  1816. /**
  1817. * Resets all vertical slides so that only the first
  1818. * is visible.
  1819. */
  1820. function resetVerticalSlides() {
  1821. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1822. horizontalSlides.forEach( function( horizontalSlide ) {
  1823. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1824. verticalSlides.forEach( function( verticalSlide, y ) {
  1825. if( y > 0 ) {
  1826. verticalSlide.classList.remove( 'present' );
  1827. verticalSlide.classList.remove( 'past' );
  1828. verticalSlide.classList.add( 'future' );
  1829. verticalSlide.setAttribute( 'aria-hidden', 'true' );
  1830. }
  1831. } );
  1832. } );
  1833. }
  1834. /**
  1835. * Sorts and formats all of fragments in the
  1836. * presentation.
  1837. */
  1838. function sortAllFragments() {
  1839. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1840. horizontalSlides.forEach( function( horizontalSlide ) {
  1841. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  1842. verticalSlides.forEach( function( verticalSlide, y ) {
  1843. sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
  1844. } );
  1845. if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
  1846. } );
  1847. }
  1848. /**
  1849. * Randomly shuffles all slides in the deck.
  1850. */
  1851. function shuffle() {
  1852. var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  1853. slides.forEach( function( slide ) {
  1854. // Insert this slide next to another random slide. This may
  1855. // cause the slide to insert before itself but that's fine.
  1856. dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
  1857. } );
  1858. }
  1859. /**
  1860. * Updates one dimension of slides by showing the slide
  1861. * with the specified index.
  1862. *
  1863. * @param {String} selector A CSS selector that will fetch
  1864. * the group of slides we are working with
  1865. * @param {Number} index The index of the slide that should be
  1866. * shown
  1867. *
  1868. * @return {Number} The index of the slide that is now shown,
  1869. * might differ from the passed in index if it was out of
  1870. * bounds.
  1871. */
  1872. function updateSlides( selector, index ) {
  1873. // Select all slides and convert the NodeList result to
  1874. // an array
  1875. var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
  1876. slidesLength = slides.length;
  1877. var printMode = isPrintingPDF();
  1878. if( slidesLength ) {
  1879. // Should the index loop?
  1880. if( config.loop ) {
  1881. index %= slidesLength;
  1882. if( index < 0 ) {
  1883. index = slidesLength + index;
  1884. }
  1885. }
  1886. // Enforce max and minimum index bounds
  1887. index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  1888. for( var i = 0; i < slidesLength; i++ ) {
  1889. var element = slides[i];
  1890. var reverse = config.rtl && !isVerticalSlide( element );
  1891. element.classList.remove( 'past' );
  1892. element.classList.remove( 'present' );
  1893. element.classList.remove( 'future' );
  1894. // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
  1895. element.setAttribute( 'hidden', '' );
  1896. element.setAttribute( 'aria-hidden', 'true' );
  1897. // If this element contains vertical slides
  1898. if( element.querySelector( 'section' ) ) {
  1899. element.classList.add( 'stack' );
  1900. }
  1901. // If we're printing static slides, all slides are "present"
  1902. if( printMode ) {
  1903. element.classList.add( 'present' );
  1904. continue;
  1905. }
  1906. if( i < index ) {
  1907. // Any element previous to index is given the 'past' class
  1908. element.classList.add( reverse ? 'future' : 'past' );
  1909. if( config.fragments ) {
  1910. var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
  1911. // Show all fragments on prior slides
  1912. while( pastFragments.length ) {
  1913. var pastFragment = pastFragments.pop();
  1914. pastFragment.classList.add( 'visible' );
  1915. pastFragment.classList.remove( 'current-fragment' );
  1916. }
  1917. }
  1918. }
  1919. else if( i > index ) {
  1920. // Any element subsequent to index is given the 'future' class
  1921. element.classList.add( reverse ? 'past' : 'future' );
  1922. if( config.fragments ) {
  1923. var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
  1924. // No fragments in future slides should be visible ahead of time
  1925. while( futureFragments.length ) {
  1926. var futureFragment = futureFragments.pop();
  1927. futureFragment.classList.remove( 'visible' );
  1928. futureFragment.classList.remove( 'current-fragment' );
  1929. }
  1930. }
  1931. }
  1932. }
  1933. // Mark the current slide as present
  1934. slides[index].classList.add( 'present' );
  1935. slides[index].removeAttribute( 'hidden' );
  1936. slides[index].removeAttribute( 'aria-hidden' );
  1937. // If this slide has a state associated with it, add it
  1938. // onto the current state of the deck
  1939. var slideState = slides[index].getAttribute( 'data-state' );
  1940. if( slideState ) {
  1941. state = state.concat( slideState.split( ' ' ) );
  1942. }
  1943. }
  1944. else {
  1945. // Since there are no slides we can't be anywhere beyond the
  1946. // zeroth index
  1947. index = 0;
  1948. }
  1949. return index;
  1950. }
  1951. /**
  1952. * Optimization method; hide all slides that are far away
  1953. * from the present slide.
  1954. */
  1955. function updateSlidesVisibility() {
  1956. // Select all slides and convert the NodeList result to
  1957. // an array
  1958. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
  1959. horizontalSlidesLength = horizontalSlides.length,
  1960. distanceX,
  1961. distanceY;
  1962. if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
  1963. // The number of steps away from the present slide that will
  1964. // be visible
  1965. var viewDistance = isOverview() ? 10 : config.viewDistance;
  1966. // Limit view distance on weaker devices
  1967. if( isMobileDevice ) {
  1968. viewDistance = isOverview() ? 6 : 2;
  1969. }
  1970. // All slides need to be visible when exporting to PDF
  1971. if( isPrintingPDF() ) {
  1972. viewDistance = Number.MAX_VALUE;
  1973. }
  1974. for( var x = 0; x < horizontalSlidesLength; x++ ) {
  1975. var horizontalSlide = horizontalSlides[x];
  1976. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
  1977. verticalSlidesLength = verticalSlides.length;
  1978. // Determine how far away this slide is from the present
  1979. distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
  1980. // If the presentation is looped, distance should measure
  1981. // 1 between the first and last slides
  1982. if( config.loop ) {
  1983. distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
  1984. }
  1985. // Show the horizontal slide if it's within the view distance
  1986. if( distanceX < viewDistance ) {
  1987. showSlide( horizontalSlide );
  1988. }
  1989. else {
  1990. hideSlide( horizontalSlide );
  1991. }
  1992. if( verticalSlidesLength ) {
  1993. var oy = getPreviousVerticalIndex( horizontalSlide );
  1994. for( var y = 0; y < verticalSlidesLength; y++ ) {
  1995. var verticalSlide = verticalSlides[y];
  1996. distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
  1997. if( distanceX + distanceY < viewDistance ) {
  1998. showSlide( verticalSlide );
  1999. }
  2000. else {
  2001. hideSlide( verticalSlide );
  2002. }
  2003. }
  2004. }
  2005. }
  2006. }
  2007. }
  2008. /**
  2009. * Pick up notes from the current slide and display tham
  2010. * to the viewer.
  2011. *
  2012. * @see `showNotes` config value
  2013. */
  2014. function updateNotes() {
  2015. if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
  2016. dom.speakerNotes.innerHTML = getSlideNotes() || '';
  2017. }
  2018. }
  2019. /**
  2020. * Updates the progress bar to reflect the current slide.
  2021. */
  2022. function updateProgress() {
  2023. // Update progress if enabled
  2024. if( config.progress && dom.progressbar ) {
  2025. dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
  2026. }
  2027. }
  2028. /**
  2029. * Updates the slide number div to reflect the current slide.
  2030. *
  2031. * The following slide number formats are available:
  2032. * "h.v": horizontal . vertical slide number (default)
  2033. * "h/v": horizontal / vertical slide number
  2034. * "c": flattened slide number
  2035. * "c/t": flattened slide number / total slides
  2036. */
  2037. function updateSlideNumber() {
  2038. // Update slide number if enabled
  2039. if( config.slideNumber && dom.slideNumber ) {
  2040. var value = [];
  2041. var format = 'h.v';
  2042. // Check if a custom number format is available
  2043. if( typeof config.slideNumber === 'string' ) {
  2044. format = config.slideNumber;
  2045. }
  2046. switch( format ) {
  2047. case 'c':
  2048. value.push( getSlidePastCount() + 1 );
  2049. break;
  2050. case 'c/t':
  2051. value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
  2052. break;
  2053. case 'h/v':
  2054. value.push( indexh + 1 );
  2055. if( isVerticalSlide() ) value.push( '/', indexv + 1 );
  2056. break;
  2057. default:
  2058. value.push( indexh + 1 );
  2059. if( isVerticalSlide() ) value.push( '.', indexv + 1 );
  2060. }
  2061. dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
  2062. }
  2063. }
  2064. /**
  2065. * Applies HTML formatting to a slide number before it's
  2066. * written to the DOM.
  2067. */
  2068. function formatSlideNumber( a, delimiter, b ) {
  2069. if( typeof b === 'number' && !isNaN( b ) ) {
  2070. return '<span class="slide-number-a">'+ a +'</span>' +
  2071. '<span class="slide-number-delimiter">'+ delimiter +'</span>' +
  2072. '<span class="slide-number-b">'+ b +'</span>';
  2073. }
  2074. else {
  2075. return '<span class="slide-number-a">'+ a +'</span>';
  2076. }
  2077. }
  2078. /**
  2079. * Updates the state of all control/navigation arrows.
  2080. */
  2081. function updateControls() {
  2082. var routes = availableRoutes();
  2083. var fragments = availableFragments();
  2084. // Remove the 'enabled' class from all directions
  2085. dom.controlsLeft.concat( dom.controlsRight )
  2086. .concat( dom.controlsUp )
  2087. .concat( dom.controlsDown )
  2088. .concat( dom.controlsPrev )
  2089. .concat( dom.controlsNext ).forEach( function( node ) {
  2090. node.classList.remove( 'enabled' );
  2091. node.classList.remove( 'fragmented' );
  2092. // Set 'disabled' attribute on all directions
  2093. node.setAttribute( 'disabled', 'disabled' );
  2094. } );
  2095. // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
  2096. if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2097. if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2098. if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2099. if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2100. // Prev/next buttons
  2101. if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2102. if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2103. // Highlight fragment directions
  2104. if( currentSlide ) {
  2105. // Always apply fragment decorator to prev/next buttons
  2106. if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2107. if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2108. // Apply fragment decorators to directional buttons based on
  2109. // what slide axis they are in
  2110. if( isVerticalSlide( currentSlide ) ) {
  2111. if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2112. if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2113. }
  2114. else {
  2115. if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2116. if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
  2117. }
  2118. }
  2119. }
  2120. /**
  2121. * Updates the background elements to reflect the current
  2122. * slide.
  2123. *
  2124. * @param {Boolean} includeAll If true, the backgrounds of
  2125. * all vertical slides (not just the present) will be updated.
  2126. */
  2127. function updateBackground( includeAll ) {
  2128. var currentBackground = null;
  2129. // Reverse past/future classes when in RTL mode
  2130. var horizontalPast = config.rtl ? 'future' : 'past',
  2131. horizontalFuture = config.rtl ? 'past' : 'future';
  2132. // Update the classes of all backgrounds to match the
  2133. // states of their slides (past/present/future)
  2134. toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
  2135. backgroundh.classList.remove( 'past' );
  2136. backgroundh.classList.remove( 'present' );
  2137. backgroundh.classList.remove( 'future' );
  2138. if( h < indexh ) {
  2139. backgroundh.classList.add( horizontalPast );
  2140. }
  2141. else if ( h > indexh ) {
  2142. backgroundh.classList.add( horizontalFuture );
  2143. }
  2144. else {
  2145. backgroundh.classList.add( 'present' );
  2146. // Store a reference to the current background element
  2147. currentBackground = backgroundh;
  2148. }
  2149. if( includeAll || h === indexh ) {
  2150. toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
  2151. backgroundv.classList.remove( 'past' );
  2152. backgroundv.classList.remove( 'present' );
  2153. backgroundv.classList.remove( 'future' );
  2154. if( v < indexv ) {
  2155. backgroundv.classList.add( 'past' );
  2156. }
  2157. else if ( v > indexv ) {
  2158. backgroundv.classList.add( 'future' );
  2159. }
  2160. else {
  2161. backgroundv.classList.add( 'present' );
  2162. // Only if this is the present horizontal and vertical slide
  2163. if( h === indexh ) currentBackground = backgroundv;
  2164. }
  2165. } );
  2166. }
  2167. } );
  2168. // Stop any currently playing video background
  2169. if( previousBackground ) {
  2170. var previousVideo = previousBackground.querySelector( 'video' );
  2171. if( previousVideo ) previousVideo.pause();
  2172. }
  2173. if( currentBackground ) {
  2174. // Start video playback
  2175. var currentVideo = currentBackground.querySelector( 'video' );
  2176. if( currentVideo ) {
  2177. var startVideo = function() {
  2178. currentVideo.currentTime = 0;
  2179. currentVideo.play();
  2180. currentVideo.removeEventListener( 'loadeddata', startVideo );
  2181. };
  2182. if( currentVideo.readyState > 1 ) {
  2183. startVideo();
  2184. }
  2185. else {
  2186. currentVideo.addEventListener( 'loadeddata', startVideo );
  2187. }
  2188. }
  2189. var backgroundImageURL = currentBackground.style.backgroundImage || '';
  2190. // Restart GIFs (doesn't work in Firefox)
  2191. if( /\.gif/i.test( backgroundImageURL ) ) {
  2192. currentBackground.style.backgroundImage = '';
  2193. window.getComputedStyle( currentBackground ).opacity;
  2194. currentBackground.style.backgroundImage = backgroundImageURL;
  2195. }
  2196. // Don't transition between identical backgrounds. This
  2197. // prevents unwanted flicker.
  2198. var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
  2199. var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
  2200. if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
  2201. dom.background.classList.add( 'no-transition' );
  2202. }
  2203. previousBackground = currentBackground;
  2204. }
  2205. // If there's a background brightness flag for this slide,
  2206. // bubble it to the .reveal container
  2207. if( currentSlide ) {
  2208. [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
  2209. if( currentSlide.classList.contains( classToBubble ) ) {
  2210. dom.wrapper.classList.add( classToBubble );
  2211. }
  2212. else {
  2213. dom.wrapper.classList.remove( classToBubble );
  2214. }
  2215. } );
  2216. }
  2217. // Allow the first background to apply without transition
  2218. setTimeout( function() {
  2219. dom.background.classList.remove( 'no-transition' );
  2220. }, 1 );
  2221. }
  2222. /**
  2223. * Updates the position of the parallax background based
  2224. * on the current slide index.
  2225. */
  2226. function updateParallax() {
  2227. if( config.parallaxBackgroundImage ) {
  2228. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2229. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2230. var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
  2231. backgroundWidth, backgroundHeight;
  2232. if( backgroundSize.length === 1 ) {
  2233. backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
  2234. }
  2235. else {
  2236. backgroundWidth = parseInt( backgroundSize[0], 10 );
  2237. backgroundHeight = parseInt( backgroundSize[1], 10 );
  2238. }
  2239. var slideWidth = dom.background.offsetWidth,
  2240. horizontalSlideCount = horizontalSlides.length,
  2241. horizontalOffsetMultiplier,
  2242. horizontalOffset;
  2243. if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
  2244. horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
  2245. }
  2246. else {
  2247. horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
  2248. }
  2249. horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
  2250. var slideHeight = dom.background.offsetHeight,
  2251. verticalSlideCount = verticalSlides.length,
  2252. verticalOffsetMultiplier,
  2253. verticalOffset;
  2254. if( typeof config.parallaxBackgroundVertical === 'number' ) {
  2255. verticalOffsetMultiplier = config.parallaxBackgroundVertical;
  2256. }
  2257. else {
  2258. verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
  2259. }
  2260. verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv * 1 : 0;
  2261. dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
  2262. }
  2263. }
  2264. /**
  2265. * Called when the given slide is within the configured view
  2266. * distance. Shows the slide element and loads any content
  2267. * that is set to load lazily (data-src).
  2268. */
  2269. function showSlide( slide ) {
  2270. // Show the slide element
  2271. slide.style.display = 'block';
  2272. // Media elements with data-src attributes
  2273. toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) {
  2274. element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
  2275. element.removeAttribute( 'data-src' );
  2276. } );
  2277. // Media elements with <source> children
  2278. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
  2279. var sources = 0;
  2280. toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
  2281. source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
  2282. source.removeAttribute( 'data-src' );
  2283. sources += 1;
  2284. } );
  2285. // If we rewrote sources for this video/audio element, we need
  2286. // to manually tell it to load from its new origin
  2287. if( sources > 0 ) {
  2288. media.load();
  2289. }
  2290. } );
  2291. // Show the corresponding background element
  2292. var indices = getIndices( slide );
  2293. var background = getSlideBackground( indices.h, indices.v );
  2294. if( background ) {
  2295. background.style.display = 'block';
  2296. // If the background contains media, load it
  2297. if( background.hasAttribute( 'data-loaded' ) === false ) {
  2298. background.setAttribute( 'data-loaded', 'true' );
  2299. var backgroundImage = slide.getAttribute( 'data-background-image' ),
  2300. backgroundVideo = slide.getAttribute( 'data-background-video' ),
  2301. backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
  2302. backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ),
  2303. backgroundIframe = slide.getAttribute( 'data-background-iframe' );
  2304. // Images
  2305. if( backgroundImage ) {
  2306. background.style.backgroundImage = 'url('+ backgroundImage +')';
  2307. }
  2308. // Videos
  2309. else if ( backgroundVideo && !isSpeakerNotes() ) {
  2310. var video = document.createElement( 'video' );
  2311. if( backgroundVideoLoop ) {
  2312. video.setAttribute( 'loop', '' );
  2313. }
  2314. if( backgroundVideoMuted ) {
  2315. video.muted = true;
  2316. }
  2317. // Support comma separated lists of video sources
  2318. backgroundVideo.split( ',' ).forEach( function( source ) {
  2319. video.innerHTML += '<source src="'+ source +'">';
  2320. } );
  2321. background.appendChild( video );
  2322. }
  2323. // Iframes
  2324. else if( backgroundIframe ) {
  2325. var iframe = document.createElement( 'iframe' );
  2326. iframe.setAttribute( 'src', backgroundIframe );
  2327. iframe.style.width = '100%';
  2328. iframe.style.height = '100%';
  2329. iframe.style.maxHeight = '100%';
  2330. iframe.style.maxWidth = '100%';
  2331. background.appendChild( iframe );
  2332. }
  2333. }
  2334. }
  2335. }
  2336. /**
  2337. * Called when the given slide is moved outside of the
  2338. * configured view distance.
  2339. */
  2340. function hideSlide( slide ) {
  2341. // Hide the slide element
  2342. slide.style.display = 'none';
  2343. // Hide the corresponding background element
  2344. var indices = getIndices( slide );
  2345. var background = getSlideBackground( indices.h, indices.v );
  2346. if( background ) {
  2347. background.style.display = 'none';
  2348. }
  2349. }
  2350. /**
  2351. * Determine what available routes there are for navigation.
  2352. *
  2353. * @return {Object} containing four booleans: left/right/up/down
  2354. */
  2355. function availableRoutes() {
  2356. var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
  2357. verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  2358. var routes = {
  2359. left: indexh > 0 || config.loop,
  2360. right: indexh < horizontalSlides.length - 1 || config.loop,
  2361. up: indexv > 0,
  2362. down: indexv < verticalSlides.length - 1
  2363. };
  2364. // reverse horizontal controls for rtl
  2365. if( config.rtl ) {
  2366. var left = routes.left;
  2367. routes.left = routes.right;
  2368. routes.right = left;
  2369. }
  2370. return routes;
  2371. }
  2372. /**
  2373. * Returns an object describing the available fragment
  2374. * directions.
  2375. *
  2376. * @return {Object} two boolean properties: prev/next
  2377. */
  2378. function availableFragments() {
  2379. if( currentSlide && config.fragments ) {
  2380. var fragments = currentSlide.querySelectorAll( '.fragment' );
  2381. var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
  2382. return {
  2383. prev: fragments.length - hiddenFragments.length > 0,
  2384. next: !!hiddenFragments.length
  2385. };
  2386. }
  2387. else {
  2388. return { prev: false, next: false };
  2389. }
  2390. }
  2391. /**
  2392. * Enforces origin-specific format rules for embedded media.
  2393. */
  2394. function formatEmbeddedContent() {
  2395. var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
  2396. toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
  2397. var src = el.getAttribute( sourceAttribute );
  2398. if( src && src.indexOf( param ) === -1 ) {
  2399. el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
  2400. }
  2401. });
  2402. };
  2403. // YouTube frames must include "?enablejsapi=1"
  2404. _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
  2405. _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
  2406. // Vimeo frames must include "?api=1"
  2407. _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
  2408. _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
  2409. }
  2410. /**
  2411. * Start playback of any embedded content inside of
  2412. * the given element.
  2413. */
  2414. function startEmbeddedContent( element ) {
  2415. if( element && !isSpeakerNotes() ) {
  2416. // Restart GIFs
  2417. toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
  2418. // Setting the same unchanged source like this was confirmed
  2419. // to work in Chrome, FF & Safari
  2420. el.setAttribute( 'src', el.getAttribute( 'src' ) );
  2421. } );
  2422. // HTML5 media elements
  2423. toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2424. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  2425. return;
  2426. }
  2427. if( el.hasAttribute( 'data-autoplay' ) && typeof el.play === 'function' ) {
  2428. el.play();
  2429. }
  2430. } );
  2431. // Normal iframes
  2432. toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
  2433. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  2434. return;
  2435. }
  2436. startEmbeddedIframe( { target: el } );
  2437. } );
  2438. // Lazy loading iframes
  2439. toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  2440. if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) {
  2441. return;
  2442. }
  2443. if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
  2444. el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
  2445. el.addEventListener( 'load', startEmbeddedIframe );
  2446. el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
  2447. }
  2448. } );
  2449. }
  2450. }
  2451. /**
  2452. * "Starts" the content of an embedded iframe using the
  2453. * postmessage API.
  2454. */
  2455. function startEmbeddedIframe( event ) {
  2456. var iframe = event.target;
  2457. if( iframe && iframe.contentWindow ) {
  2458. // YouTube postMessage API
  2459. if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
  2460. iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
  2461. }
  2462. // Vimeo postMessage API
  2463. else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
  2464. iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
  2465. }
  2466. // Generic postMessage API
  2467. else {
  2468. iframe.contentWindow.postMessage( 'slide:start', '*' );
  2469. }
  2470. }
  2471. }
  2472. /**
  2473. * Stop playback of any embedded content inside of
  2474. * the targeted slide.
  2475. */
  2476. function stopEmbeddedContent( slide ) {
  2477. if( slide && slide.parentNode ) {
  2478. // HTML5 media elements
  2479. toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2480. if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
  2481. el.pause();
  2482. }
  2483. } );
  2484. // Generic postMessage API for non-lazy loaded iframes
  2485. toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
  2486. el.contentWindow.postMessage( 'slide:stop', '*' );
  2487. el.removeEventListener( 'load', startEmbeddedIframe );
  2488. });
  2489. // YouTube postMessage API
  2490. toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
  2491. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  2492. el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
  2493. }
  2494. });
  2495. // Vimeo postMessage API
  2496. toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
  2497. if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
  2498. el.contentWindow.postMessage( '{"method":"pause"}', '*' );
  2499. }
  2500. });
  2501. // Lazy loading iframes
  2502. toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
  2503. // Only removing the src doesn't actually unload the frame
  2504. // in all browsers (Firefox) so we set it to blank first
  2505. el.setAttribute( 'src', 'about:blank' );
  2506. el.removeAttribute( 'src' );
  2507. } );
  2508. }
  2509. }
  2510. /**
  2511. * Returns the number of past slides. This can be used as a global
  2512. * flattened index for slides.
  2513. */
  2514. function getSlidePastCount() {
  2515. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2516. // The number of past slides
  2517. var pastCount = 0;
  2518. // Step through all slides and count the past ones
  2519. mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
  2520. var horizontalSlide = horizontalSlides[i];
  2521. var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
  2522. for( var j = 0; j < verticalSlides.length; j++ ) {
  2523. // Stop as soon as we arrive at the present
  2524. if( verticalSlides[j].classList.contains( 'present' ) ) {
  2525. break mainLoop;
  2526. }
  2527. pastCount++;
  2528. }
  2529. // Stop as soon as we arrive at the present
  2530. if( horizontalSlide.classList.contains( 'present' ) ) {
  2531. break;
  2532. }
  2533. // Don't count the wrapping section for vertical slides
  2534. if( horizontalSlide.classList.contains( 'stack' ) === false ) {
  2535. pastCount++;
  2536. }
  2537. }
  2538. return pastCount;
  2539. }
  2540. /**
  2541. * Returns a value ranging from 0-1 that represents
  2542. * how far into the presentation we have navigated.
  2543. */
  2544. function getProgress() {
  2545. // The number of past and total slides
  2546. var totalCount = getTotalSlides();
  2547. var pastCount = getSlidePastCount();
  2548. if( currentSlide ) {
  2549. var allFragments = currentSlide.querySelectorAll( '.fragment' );
  2550. // If there are fragments in the current slide those should be
  2551. // accounted for in the progress.
  2552. if( allFragments.length > 0 ) {
  2553. var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
  2554. // This value represents how big a portion of the slide progress
  2555. // that is made up by its fragments (0-1)
  2556. var fragmentWeight = 0.9;
  2557. // Add fragment progress to the past slide count
  2558. pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
  2559. }
  2560. }
  2561. return pastCount / ( totalCount - 1 );
  2562. }
  2563. /**
  2564. * Checks if this presentation is running inside of the
  2565. * speaker notes window.
  2566. */
  2567. function isSpeakerNotes() {
  2568. return !!window.location.search.match( /receiver/gi );
  2569. }
  2570. /**
  2571. * Reads the current URL (hash) and navigates accordingly.
  2572. */
  2573. function readURL() {
  2574. var hash = window.location.hash;
  2575. // Attempt to parse the hash as either an index or name
  2576. var bits = hash.slice( 2 ).split( '/' ),
  2577. name = hash.replace( /#|\//gi, '' );
  2578. // If the first bit is invalid and there is a name we can
  2579. // assume that this is a named link
  2580. if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
  2581. var element;
  2582. // Ensure the named link is a valid HTML ID attribute
  2583. if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) {
  2584. // Find the slide with the specified ID
  2585. element = document.getElementById( name );
  2586. }
  2587. if( element ) {
  2588. // Find the position of the named slide and navigate to it
  2589. var indices = Reveal.getIndices( element );
  2590. slide( indices.h, indices.v );
  2591. }
  2592. // If the slide doesn't exist, navigate to the current slide
  2593. else {
  2594. slide( indexh || 0, indexv || 0 );
  2595. }
  2596. }
  2597. else {
  2598. // Read the index components of the hash
  2599. var h = parseInt( bits[0], 10 ) || 0,
  2600. v = parseInt( bits[1], 10 ) || 0;
  2601. if( h !== indexh || v !== indexv ) {
  2602. slide( h, v );
  2603. }
  2604. }
  2605. }
  2606. /**
  2607. * Updates the page URL (hash) to reflect the current
  2608. * state.
  2609. *
  2610. * @param {Number} delay The time in ms to wait before
  2611. * writing the hash
  2612. */
  2613. function writeURL( delay ) {
  2614. if( config.history ) {
  2615. // Make sure there's never more than one timeout running
  2616. clearTimeout( writeURLTimeout );
  2617. // If a delay is specified, timeout this call
  2618. if( typeof delay === 'number' ) {
  2619. writeURLTimeout = setTimeout( writeURL, delay );
  2620. }
  2621. else if( currentSlide ) {
  2622. var url = '/';
  2623. // Attempt to create a named link based on the slide's ID
  2624. var id = currentSlide.getAttribute( 'id' );
  2625. if( id ) {
  2626. id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
  2627. }
  2628. // If the current slide has an ID, use that as a named link
  2629. if( typeof id === 'string' && id.length ) {
  2630. url = '/' + id;
  2631. }
  2632. // Otherwise use the /h/v index
  2633. else {
  2634. if( indexh > 0 || indexv > 0 ) url += indexh;
  2635. if( indexv > 0 ) url += '/' + indexv;
  2636. }
  2637. window.location.hash = url;
  2638. }
  2639. }
  2640. }
  2641. /**
  2642. * Retrieves the h/v location of the current, or specified,
  2643. * slide.
  2644. *
  2645. * @param {HTMLElement} slide If specified, the returned
  2646. * index will be for this slide rather than the currently
  2647. * active one
  2648. *
  2649. * @return {Object} { h: <int>, v: <int>, f: <int> }
  2650. */
  2651. function getIndices( slide ) {
  2652. // By default, return the current indices
  2653. var h = indexh,
  2654. v = indexv,
  2655. f;
  2656. // If a slide is specified, return the indices of that slide
  2657. if( slide ) {
  2658. var isVertical = isVerticalSlide( slide );
  2659. var slideh = isVertical ? slide.parentNode : slide;
  2660. // Select all horizontal slides
  2661. var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  2662. // Now that we know which the horizontal slide is, get its index
  2663. h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
  2664. // Assume we're not vertical
  2665. v = undefined;
  2666. // If this is a vertical slide, grab the vertical index
  2667. if( isVertical ) {
  2668. v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
  2669. }
  2670. }
  2671. if( !slide && currentSlide ) {
  2672. var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
  2673. if( hasFragments ) {
  2674. var currentFragment = currentSlide.querySelector( '.current-fragment' );
  2675. if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
  2676. f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
  2677. }
  2678. else {
  2679. f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
  2680. }
  2681. }
  2682. }
  2683. return { h: h, v: v, f: f };
  2684. }
  2685. /**
  2686. * Retrieves the total number of slides in this presentation.
  2687. */
  2688. function getTotalSlides() {
  2689. return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
  2690. }
  2691. /**
  2692. * Returns the slide element matching the specified index.
  2693. */
  2694. function getSlide( x, y ) {
  2695. var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
  2696. var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
  2697. if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
  2698. return verticalSlides ? verticalSlides[ y ] : undefined;
  2699. }
  2700. return horizontalSlide;
  2701. }
  2702. /**
  2703. * Returns the background element for the given slide.
  2704. * All slides, even the ones with no background properties
  2705. * defined, have a background element so as long as the
  2706. * index is valid an element will be returned.
  2707. */
  2708. function getSlideBackground( x, y ) {
  2709. // When printing to PDF the slide backgrounds are nested
  2710. // inside of the slides
  2711. if( isPrintingPDF() ) {
  2712. var slide = getSlide( x, y );
  2713. if( slide ) {
  2714. return slide.slideBackgroundElement;
  2715. }
  2716. return undefined;
  2717. }
  2718. var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
  2719. var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
  2720. if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
  2721. return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
  2722. }
  2723. return horizontalBackground;
  2724. }
  2725. /**
  2726. * Retrieves the speaker notes from a slide. Notes can be
  2727. * defined in two ways:
  2728. * 1. As a data-notes attribute on the slide <section>
  2729. * 2. As an <aside class="notes"> inside of the slide
  2730. */
  2731. function getSlideNotes( slide ) {
  2732. // Default to the current slide
  2733. slide = slide || currentSlide;
  2734. // Notes can be specified via the data-notes attribute...
  2735. if( slide.hasAttribute( 'data-notes' ) ) {
  2736. return slide.getAttribute( 'data-notes' );
  2737. }
  2738. // ... or using an <aside class="notes"> element
  2739. var notesElement = slide.querySelector( 'aside.notes' );
  2740. if( notesElement ) {
  2741. return notesElement.innerHTML;
  2742. }
  2743. return null;
  2744. }
  2745. /**
  2746. * Retrieves the current state of the presentation as
  2747. * an object. This state can then be restored at any
  2748. * time.
  2749. */
  2750. function getState() {
  2751. var indices = getIndices();
  2752. return {
  2753. indexh: indices.h,
  2754. indexv: indices.v,
  2755. indexf: indices.f,
  2756. paused: isPaused(),
  2757. overview: isOverview()
  2758. };
  2759. }
  2760. /**
  2761. * Restores the presentation to the given state.
  2762. *
  2763. * @param {Object} state As generated by getState()
  2764. */
  2765. function setState( state ) {
  2766. if( typeof state === 'object' ) {
  2767. slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
  2768. var pausedFlag = deserialize( state.paused ),
  2769. overviewFlag = deserialize( state.overview );
  2770. if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
  2771. togglePause( pausedFlag );
  2772. }
  2773. if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
  2774. toggleOverview( overviewFlag );
  2775. }
  2776. }
  2777. }
  2778. /**
  2779. * Return a sorted fragments list, ordered by an increasing
  2780. * "data-fragment-index" attribute.
  2781. *
  2782. * Fragments will be revealed in the order that they are returned by
  2783. * this function, so you can use the index attributes to control the
  2784. * order of fragment appearance.
  2785. *
  2786. * To maintain a sensible default fragment order, fragments are presumed
  2787. * to be passed in document order. This function adds a "fragment-index"
  2788. * attribute to each node if such an attribute is not already present,
  2789. * and sets that attribute to an integer value which is the position of
  2790. * the fragment within the fragments list.
  2791. */
  2792. function sortFragments( fragments ) {
  2793. fragments = toArray( fragments );
  2794. var ordered = [],
  2795. unordered = [],
  2796. sorted = [];
  2797. // Group ordered and unordered elements
  2798. fragments.forEach( function( fragment, i ) {
  2799. if( fragment.hasAttribute( 'data-fragment-index' ) ) {
  2800. var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
  2801. if( !ordered[index] ) {
  2802. ordered[index] = [];
  2803. }
  2804. ordered[index].push( fragment );
  2805. }
  2806. else {
  2807. unordered.push( [ fragment ] );
  2808. }
  2809. } );
  2810. // Append fragments without explicit indices in their
  2811. // DOM order
  2812. ordered = ordered.concat( unordered );
  2813. // Manually count the index up per group to ensure there
  2814. // are no gaps
  2815. var index = 0;
  2816. // Push all fragments in their sorted order to an array,
  2817. // this flattens the groups
  2818. ordered.forEach( function( group ) {
  2819. group.forEach( function( fragment ) {
  2820. sorted.push( fragment );
  2821. fragment.setAttribute( 'data-fragment-index', index );
  2822. } );
  2823. index ++;
  2824. } );
  2825. return sorted;
  2826. }
  2827. /**
  2828. * Navigate to the specified slide fragment.
  2829. *
  2830. * @param {Number} index The index of the fragment that
  2831. * should be shown, -1 means all are invisible
  2832. * @param {Number} offset Integer offset to apply to the
  2833. * fragment index
  2834. *
  2835. * @return {Boolean} true if a change was made in any
  2836. * fragments visibility as part of this call
  2837. */
  2838. function navigateFragment( index, offset ) {
  2839. if( currentSlide && config.fragments ) {
  2840. var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
  2841. if( fragments.length ) {
  2842. // If no index is specified, find the current
  2843. if( typeof index !== 'number' ) {
  2844. var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
  2845. if( lastVisibleFragment ) {
  2846. index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
  2847. }
  2848. else {
  2849. index = -1;
  2850. }
  2851. }
  2852. // If an offset is specified, apply it to the index
  2853. if( typeof offset === 'number' ) {
  2854. index += offset;
  2855. }
  2856. var fragmentsShown = [],
  2857. fragmentsHidden = [];
  2858. toArray( fragments ).forEach( function( element, i ) {
  2859. if( element.hasAttribute( 'data-fragment-index' ) ) {
  2860. i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
  2861. }
  2862. // Visible fragments
  2863. if( i <= index ) {
  2864. if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
  2865. element.classList.add( 'visible' );
  2866. element.classList.remove( 'current-fragment' );
  2867. // Announce the fragments one by one to the Screen Reader
  2868. dom.statusDiv.textContent = getStatusText( element );
  2869. if( i === index ) {
  2870. element.classList.add( 'current-fragment' );
  2871. startEmbeddedContent( element );
  2872. }
  2873. }
  2874. // Hidden fragments
  2875. else {
  2876. if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
  2877. element.classList.remove( 'visible' );
  2878. element.classList.remove( 'current-fragment' );
  2879. }
  2880. } );
  2881. if( fragmentsHidden.length ) {
  2882. dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
  2883. }
  2884. if( fragmentsShown.length ) {
  2885. dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
  2886. }
  2887. updateControls();
  2888. updateProgress();
  2889. return !!( fragmentsShown.length || fragmentsHidden.length );
  2890. }
  2891. }
  2892. return false;
  2893. }
  2894. /**
  2895. * Navigate to the next slide fragment.
  2896. *
  2897. * @return {Boolean} true if there was a next fragment,
  2898. * false otherwise
  2899. */
  2900. function nextFragment() {
  2901. return navigateFragment( null, 1 );
  2902. }
  2903. /**
  2904. * Navigate to the previous slide fragment.
  2905. *
  2906. * @return {Boolean} true if there was a previous fragment,
  2907. * false otherwise
  2908. */
  2909. function previousFragment() {
  2910. return navigateFragment( null, -1 );
  2911. }
  2912. /**
  2913. * Cues a new automated slide if enabled in the config.
  2914. */
  2915. function cueAutoSlide() {
  2916. cancelAutoSlide();
  2917. if( currentSlide ) {
  2918. var fragment = currentSlide.querySelector( '.current-fragment' );
  2919. // When the slide first appears there is no "current" fragment so
  2920. // we look for a data-autoslide timing on the first fragment
  2921. if( !fragment ) fragment = currentSlide.querySelector( '.fragment' );
  2922. var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
  2923. var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
  2924. var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
  2925. // Pick value in the following priority order:
  2926. // 1. Current fragment's data-autoslide
  2927. // 2. Current slide's data-autoslide
  2928. // 3. Parent slide's data-autoslide
  2929. // 4. Global autoSlide setting
  2930. if( fragmentAutoSlide ) {
  2931. autoSlide = parseInt( fragmentAutoSlide, 10 );
  2932. }
  2933. else if( slideAutoSlide ) {
  2934. autoSlide = parseInt( slideAutoSlide, 10 );
  2935. }
  2936. else if( parentAutoSlide ) {
  2937. autoSlide = parseInt( parentAutoSlide, 10 );
  2938. }
  2939. else {
  2940. autoSlide = config.autoSlide;
  2941. }
  2942. // If there are media elements with data-autoplay,
  2943. // automatically set the autoSlide duration to the
  2944. // length of that media. Not applicable if the slide
  2945. // is divided up into fragments.
  2946. // playbackRate is accounted for in the duration.
  2947. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
  2948. toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
  2949. if( el.hasAttribute( 'data-autoplay' ) ) {
  2950. if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
  2951. autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
  2952. }
  2953. }
  2954. } );
  2955. }
  2956. // Cue the next auto-slide if:
  2957. // - There is an autoSlide value
  2958. // - Auto-sliding isn't paused by the user
  2959. // - The presentation isn't paused
  2960. // - The overview isn't active
  2961. // - The presentation isn't over
  2962. if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
  2963. autoSlideTimeout = setTimeout( function() {
  2964. typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
  2965. cueAutoSlide();
  2966. }, autoSlide );
  2967. autoSlideStartTime = Date.now();
  2968. }
  2969. if( autoSlidePlayer ) {
  2970. autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
  2971. }
  2972. }
  2973. }
  2974. /**
  2975. * Cancels any ongoing request to auto-slide.
  2976. */
  2977. function cancelAutoSlide() {
  2978. clearTimeout( autoSlideTimeout );
  2979. autoSlideTimeout = -1;
  2980. }
  2981. function pauseAutoSlide() {
  2982. if( autoSlide && !autoSlidePaused ) {
  2983. autoSlidePaused = true;
  2984. dispatchEvent( 'autoslidepaused' );
  2985. clearTimeout( autoSlideTimeout );
  2986. if( autoSlidePlayer ) {
  2987. autoSlidePlayer.setPlaying( false );
  2988. }
  2989. }
  2990. }
  2991. function resumeAutoSlide() {
  2992. if( autoSlide && autoSlidePaused ) {
  2993. autoSlidePaused = false;
  2994. dispatchEvent( 'autoslideresumed' );
  2995. cueAutoSlide();
  2996. }
  2997. }
  2998. function navigateLeft() {
  2999. // Reverse for RTL
  3000. if( config.rtl ) {
  3001. if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
  3002. slide( indexh + 1 );
  3003. }
  3004. }
  3005. // Normal navigation
  3006. else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
  3007. slide( indexh - 1 );
  3008. }
  3009. }
  3010. function navigateRight() {
  3011. // Reverse for RTL
  3012. if( config.rtl ) {
  3013. if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
  3014. slide( indexh - 1 );
  3015. }
  3016. }
  3017. // Normal navigation
  3018. else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
  3019. slide( indexh + 1 );
  3020. }
  3021. }
  3022. function navigateUp() {
  3023. // Prioritize hiding fragments
  3024. if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
  3025. slide( indexh, indexv - 1 );
  3026. }
  3027. }
  3028. function navigateDown() {
  3029. // Prioritize revealing fragments
  3030. if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
  3031. slide( indexh, indexv + 1 );
  3032. }
  3033. }
  3034. /**
  3035. * Navigates backwards, prioritized in the following order:
  3036. * 1) Previous fragment
  3037. * 2) Previous vertical slide
  3038. * 3) Previous horizontal slide
  3039. */
  3040. function navigatePrev() {
  3041. // Prioritize revealing fragments
  3042. if( previousFragment() === false ) {
  3043. if( availableRoutes().up ) {
  3044. navigateUp();
  3045. }
  3046. else {
  3047. // Fetch the previous horizontal slide, if there is one
  3048. var previousSlide;
  3049. if( config.rtl ) {
  3050. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
  3051. }
  3052. else {
  3053. previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
  3054. }
  3055. if( previousSlide ) {
  3056. var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
  3057. var h = indexh - 1;
  3058. slide( h, v );
  3059. }
  3060. }
  3061. }
  3062. }
  3063. /**
  3064. * The reverse of #navigatePrev().
  3065. */
  3066. function navigateNext() {
  3067. // Prioritize revealing fragments
  3068. if( nextFragment() === false ) {
  3069. if( availableRoutes().down ) {
  3070. navigateDown();
  3071. }
  3072. else if( config.rtl ) {
  3073. navigateLeft();
  3074. }
  3075. else {
  3076. navigateRight();
  3077. }
  3078. }
  3079. }
  3080. /**
  3081. * Checks if the target element prevents the triggering of
  3082. * swipe navigation.
  3083. */
  3084. function isSwipePrevented( target ) {
  3085. while( target && typeof target.hasAttribute === 'function' ) {
  3086. if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
  3087. target = target.parentNode;
  3088. }
  3089. return false;
  3090. }
  3091. // --------------------------------------------------------------------//
  3092. // ----------------------------- EVENTS -------------------------------//
  3093. // --------------------------------------------------------------------//
  3094. /**
  3095. * Called by all event handlers that are based on user
  3096. * input.
  3097. */
  3098. function onUserInput( event ) {
  3099. if( config.autoSlideStoppable ) {
  3100. pauseAutoSlide();
  3101. }
  3102. }
  3103. /**
  3104. * Handler for the document level 'keypress' event.
  3105. */
  3106. function onDocumentKeyPress( event ) {
  3107. // Check if the pressed key is question mark
  3108. if( event.shiftKey && event.charCode === 63 ) {
  3109. if( dom.overlay ) {
  3110. closeOverlay();
  3111. }
  3112. else {
  3113. showHelp( true );
  3114. }
  3115. }
  3116. }
  3117. /**
  3118. * Handler for the document level 'keydown' event.
  3119. */
  3120. function onDocumentKeyDown( event ) {
  3121. // If there's a condition specified and it returns false,
  3122. // ignore this event
  3123. if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
  3124. return true;
  3125. }
  3126. // Remember if auto-sliding was paused so we can toggle it
  3127. var autoSlideWasPaused = autoSlidePaused;
  3128. onUserInput( event );
  3129. // Check if there's a focused element that could be using
  3130. // the keyboard
  3131. var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
  3132. var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
  3133. var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
  3134. // Disregard the event if there's a focused element or a
  3135. // keyboard modifier key is present
  3136. if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
  3137. // While paused only allow resume keyboard events; 'b', 'v', '.'
  3138. var resumeKeyCodes = [66,86,190,191];
  3139. var key;
  3140. // Custom key bindings for togglePause should be able to resume
  3141. if( typeof config.keyboard === 'object' ) {
  3142. for( key in config.keyboard ) {
  3143. if( config.keyboard[key] === 'togglePause' ) {
  3144. resumeKeyCodes.push( parseInt( key, 10 ) );
  3145. }
  3146. }
  3147. }
  3148. if( isPaused() && resumeKeyCodes.indexOf( event.keyCode ) === -1 ) {
  3149. return false;
  3150. }
  3151. var triggered = false;
  3152. // 1. User defined key bindings
  3153. if( typeof config.keyboard === 'object' ) {
  3154. for( key in config.keyboard ) {
  3155. // Check if this binding matches the pressed key
  3156. if( parseInt( key, 10 ) === event.keyCode ) {
  3157. var value = config.keyboard[ key ];
  3158. // Callback function
  3159. if( typeof value === 'function' ) {
  3160. value.apply( null, [ event ] );
  3161. }
  3162. // String shortcuts to reveal.js API
  3163. else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
  3164. Reveal[ value ].call();
  3165. }
  3166. triggered = true;
  3167. }
  3168. }
  3169. }
  3170. // 2. System defined key bindings
  3171. if( triggered === false ) {
  3172. // Assume true and try to prove false
  3173. triggered = true;
  3174. switch( event.keyCode ) {
  3175. // p, page up
  3176. case 80: case 33: navigatePrev(); break;
  3177. // n, page down
  3178. case 78: case 34: navigateNext(); break;
  3179. // h, left
  3180. case 72: case 37: navigateLeft(); break;
  3181. // l, right
  3182. case 76: case 39: navigateRight(); break;
  3183. // k, up
  3184. case 75: case 38: navigateUp(); break;
  3185. // j, down
  3186. case 74: case 40: navigateDown(); break;
  3187. // home
  3188. case 36: slide( 0 ); break;
  3189. // end
  3190. case 35: slide( Number.MAX_VALUE ); break;
  3191. // space
  3192. case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
  3193. // return
  3194. case 13: isOverview() ? deactivateOverview() : triggered = false; break;
  3195. // two-spot, semicolon, b, v, period, Logitech presenter tools "black screen" button
  3196. case 58: case 59: case 66: case 86: case 190: case 191: togglePause(); break;
  3197. // f
  3198. case 70: enterFullscreen(); break;
  3199. // a
  3200. case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
  3201. default:
  3202. triggered = false;
  3203. }
  3204. }
  3205. // If the input resulted in a triggered action we should prevent
  3206. // the browsers default behavior
  3207. if( triggered ) {
  3208. event.preventDefault && event.preventDefault();
  3209. }
  3210. // ESC or O key
  3211. else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
  3212. if( dom.overlay ) {
  3213. closeOverlay();
  3214. }
  3215. else {
  3216. toggleOverview();
  3217. }
  3218. event.preventDefault && event.preventDefault();
  3219. }
  3220. // If auto-sliding is enabled we need to cue up
  3221. // another timeout
  3222. cueAutoSlide();
  3223. }
  3224. /**
  3225. * Handler for the 'touchstart' event, enables support for
  3226. * swipe and pinch gestures.
  3227. */
  3228. function onTouchStart( event ) {
  3229. if( isSwipePrevented( event.target ) ) return true;
  3230. touch.startX = event.touches[0].clientX;
  3231. touch.startY = event.touches[0].clientY;
  3232. touch.startCount = event.touches.length;
  3233. // If there's two touches we need to memorize the distance
  3234. // between those two points to detect pinching
  3235. if( event.touches.length === 2 && config.overview ) {
  3236. touch.startSpan = distanceBetween( {
  3237. x: event.touches[1].clientX,
  3238. y: event.touches[1].clientY
  3239. }, {
  3240. x: touch.startX,
  3241. y: touch.startY
  3242. } );
  3243. }
  3244. }
  3245. /**
  3246. * Handler for the 'touchmove' event.
  3247. */
  3248. function onTouchMove( event ) {
  3249. if( isSwipePrevented( event.target ) ) return true;
  3250. // Each touch should only trigger one action
  3251. if( !touch.captured ) {
  3252. onUserInput( event );
  3253. var currentX = event.touches[0].clientX;
  3254. var currentY = event.touches[0].clientY;
  3255. // If the touch started with two points and still has
  3256. // two active touches; test for the pinch gesture
  3257. if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
  3258. // The current distance in pixels between the two touch points
  3259. var currentSpan = distanceBetween( {
  3260. x: event.touches[1].clientX,
  3261. y: event.touches[1].clientY
  3262. }, {
  3263. x: touch.startX,
  3264. y: touch.startY
  3265. } );
  3266. // If the span is larger than the desire amount we've got
  3267. // ourselves a pinch
  3268. if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
  3269. touch.captured = true;
  3270. if( currentSpan < touch.startSpan ) {
  3271. activateOverview();
  3272. }
  3273. else {
  3274. deactivateOverview();
  3275. }
  3276. }
  3277. event.preventDefault();
  3278. }
  3279. // There was only one touch point, look for a swipe
  3280. else if( event.touches.length === 1 && touch.startCount !== 2 ) {
  3281. var deltaX = currentX - touch.startX,
  3282. deltaY = currentY - touch.startY;
  3283. if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  3284. touch.captured = true;
  3285. navigateLeft();
  3286. }
  3287. else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
  3288. touch.captured = true;
  3289. navigateRight();
  3290. }
  3291. else if( deltaY > touch.threshold ) {
  3292. touch.captured = true;
  3293. navigateUp();
  3294. }
  3295. else if( deltaY < -touch.threshold ) {
  3296. touch.captured = true;
  3297. navigateDown();
  3298. }
  3299. // If we're embedded, only block touch events if they have
  3300. // triggered an action
  3301. if( config.embedded ) {
  3302. if( touch.captured || isVerticalSlide( currentSlide ) ) {
  3303. event.preventDefault();
  3304. }
  3305. }
  3306. // Not embedded? Block them all to avoid needless tossing
  3307. // around of the viewport in iOS
  3308. else {
  3309. event.preventDefault();
  3310. }
  3311. }
  3312. }
  3313. // There's a bug with swiping on some Android devices unless
  3314. // the default action is always prevented
  3315. else if( UA.match( /android/gi ) ) {
  3316. event.preventDefault();
  3317. }
  3318. }
  3319. /**
  3320. * Handler for the 'touchend' event.
  3321. */
  3322. function onTouchEnd( event ) {
  3323. touch.captured = false;
  3324. }
  3325. /**
  3326. * Convert pointer down to touch start.
  3327. */
  3328. function onPointerDown( event ) {
  3329. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  3330. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  3331. onTouchStart( event );
  3332. }
  3333. }
  3334. /**
  3335. * Convert pointer move to touch move.
  3336. */
  3337. function onPointerMove( event ) {
  3338. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  3339. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  3340. onTouchMove( event );
  3341. }
  3342. }
  3343. /**
  3344. * Convert pointer up to touch end.
  3345. */
  3346. function onPointerUp( event ) {
  3347. if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
  3348. event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
  3349. onTouchEnd( event );
  3350. }
  3351. }
  3352. /**
  3353. * Handles mouse wheel scrolling, throttled to avoid skipping
  3354. * multiple slides.
  3355. */
  3356. function onDocumentMouseScroll( event ) {
  3357. if( Date.now() - lastMouseWheelStep > 600 ) {
  3358. lastMouseWheelStep = Date.now();
  3359. var delta = event.detail || -event.wheelDelta;
  3360. if( delta > 0 ) {
  3361. navigateNext();
  3362. }
  3363. else if( delta < 0 ) {
  3364. navigatePrev();
  3365. }
  3366. }
  3367. }
  3368. /**
  3369. * Clicking on the progress bar results in a navigation to the
  3370. * closest approximate horizontal slide using this equation:
  3371. *
  3372. * ( clickX / presentationWidth ) * numberOfSlides
  3373. */
  3374. function onProgressClicked( event ) {
  3375. onUserInput( event );
  3376. event.preventDefault();
  3377. var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
  3378. var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
  3379. if( config.rtl ) {
  3380. slideIndex = slidesTotal - slideIndex;
  3381. }
  3382. slide( slideIndex );
  3383. }
  3384. /**
  3385. * Event handler for navigation control buttons.
  3386. */
  3387. function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
  3388. function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
  3389. function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
  3390. function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
  3391. function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
  3392. function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
  3393. /**
  3394. * Handler for the window level 'hashchange' event.
  3395. */
  3396. function onWindowHashChange( event ) {
  3397. readURL();
  3398. }
  3399. /**
  3400. * Handler for the window level 'resize' event.
  3401. */
  3402. function onWindowResize( event ) {
  3403. layout();
  3404. }
  3405. /**
  3406. * Handle for the window level 'visibilitychange' event.
  3407. */
  3408. function onPageVisibilityChange( event ) {
  3409. var isHidden = document.webkitHidden ||
  3410. document.msHidden ||
  3411. document.hidden;
  3412. // If, after clicking a link or similar and we're coming back,
  3413. // focus the document.body to ensure we can use keyboard shortcuts
  3414. if( isHidden === false && document.activeElement !== document.body ) {
  3415. // Not all elements support .blur() - SVGs among them.
  3416. if( typeof document.activeElement.blur === 'function' ) {
  3417. document.activeElement.blur();
  3418. }
  3419. document.body.focus();
  3420. }
  3421. }
  3422. /**
  3423. * Invoked when a slide is and we're in the overview.
  3424. */
  3425. function onOverviewSlideClicked( event ) {
  3426. // TODO There's a bug here where the event listeners are not
  3427. // removed after deactivating the overview.
  3428. if( eventsAreBound && isOverview() ) {
  3429. event.preventDefault();
  3430. var element = event.target;
  3431. while( element && !element.nodeName.match( /section/gi ) ) {
  3432. element = element.parentNode;
  3433. }
  3434. if( element && !element.classList.contains( 'disabled' ) ) {
  3435. deactivateOverview();
  3436. if( element.nodeName.match( /section/gi ) ) {
  3437. var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
  3438. v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
  3439. slide( h, v );
  3440. }
  3441. }
  3442. }
  3443. }
  3444. /**
  3445. * Handles clicks on links that are set to preview in the
  3446. * iframe overlay.
  3447. */
  3448. function onPreviewLinkClicked( event ) {
  3449. if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
  3450. var url = event.currentTarget.getAttribute( 'href' );
  3451. if( url ) {
  3452. showPreview( url );
  3453. event.preventDefault();
  3454. }
  3455. }
  3456. }
  3457. /**
  3458. * Handles click on the auto-sliding controls element.
  3459. */
  3460. function onAutoSlidePlayerClick( event ) {
  3461. // Replay
  3462. if( Reveal.isLastSlide() && config.loop === false ) {
  3463. slide( 0, 0 );
  3464. resumeAutoSlide();
  3465. }
  3466. // Resume
  3467. else if( autoSlidePaused ) {
  3468. resumeAutoSlide();
  3469. }
  3470. // Pause
  3471. else {
  3472. pauseAutoSlide();
  3473. }
  3474. }
  3475. // --------------------------------------------------------------------//
  3476. // ------------------------ PLAYBACK COMPONENT ------------------------//
  3477. // --------------------------------------------------------------------//
  3478. /**
  3479. * Constructor for the playback component, which displays
  3480. * play/pause/progress controls.
  3481. *
  3482. * @param {HTMLElement} container The component will append
  3483. * itself to this
  3484. * @param {Function} progressCheck A method which will be
  3485. * called frequently to get the current progress on a range
  3486. * of 0-1
  3487. */
  3488. function Playback( container, progressCheck ) {
  3489. // Cosmetics
  3490. this.diameter = 100;
  3491. this.diameter2 = this.diameter/2;
  3492. this.thickness = 6;
  3493. // Flags if we are currently playing
  3494. this.playing = false;
  3495. // Current progress on a 0-1 range
  3496. this.progress = 0;
  3497. // Used to loop the animation smoothly
  3498. this.progressOffset = 1;
  3499. this.container = container;
  3500. this.progressCheck = progressCheck;
  3501. this.canvas = document.createElement( 'canvas' );
  3502. this.canvas.className = 'playback';
  3503. this.canvas.width = this.diameter;
  3504. this.canvas.height = this.diameter;
  3505. this.canvas.style.width = this.diameter2 + 'px';
  3506. this.canvas.style.height = this.diameter2 + 'px';
  3507. this.context = this.canvas.getContext( '2d' );
  3508. this.container.appendChild( this.canvas );
  3509. this.render();
  3510. }
  3511. Playback.prototype.setPlaying = function( value ) {
  3512. var wasPlaying = this.playing;
  3513. this.playing = value;
  3514. // Start repainting if we weren't already
  3515. if( !wasPlaying && this.playing ) {
  3516. this.animate();
  3517. }
  3518. else {
  3519. this.render();
  3520. }
  3521. };
  3522. Playback.prototype.animate = function() {
  3523. var progressBefore = this.progress;
  3524. this.progress = this.progressCheck();
  3525. // When we loop, offset the progress so that it eases
  3526. // smoothly rather than immediately resetting
  3527. if( progressBefore > 0.8 && this.progress < 0.2 ) {
  3528. this.progressOffset = this.progress;
  3529. }
  3530. this.render();
  3531. if( this.playing ) {
  3532. features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
  3533. }
  3534. };
  3535. /**
  3536. * Renders the current progress and playback state.
  3537. */
  3538. Playback.prototype.render = function() {
  3539. var progress = this.playing ? this.progress : 0,
  3540. radius = ( this.diameter2 ) - this.thickness,
  3541. x = this.diameter2,
  3542. y = this.diameter2,
  3543. iconSize = 28;
  3544. // Ease towards 1
  3545. this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
  3546. var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
  3547. var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
  3548. this.context.save();
  3549. this.context.clearRect( 0, 0, this.diameter, this.diameter );
  3550. // Solid background color
  3551. this.context.beginPath();
  3552. this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
  3553. this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
  3554. this.context.fill();
  3555. // Draw progress track
  3556. this.context.beginPath();
  3557. this.context.arc( x, y, radius, 0, Math.PI * 2, false );
  3558. this.context.lineWidth = this.thickness;
  3559. this.context.strokeStyle = '#666';
  3560. this.context.stroke();
  3561. if( this.playing ) {
  3562. // Draw progress on top of track
  3563. this.context.beginPath();
  3564. this.context.arc( x, y, radius, startAngle, endAngle, false );
  3565. this.context.lineWidth = this.thickness;
  3566. this.context.strokeStyle = '#fff';
  3567. this.context.stroke();
  3568. }
  3569. this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
  3570. // Draw play/pause icons
  3571. if( this.playing ) {
  3572. this.context.fillStyle = '#fff';
  3573. this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
  3574. this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
  3575. }
  3576. else {
  3577. this.context.beginPath();
  3578. this.context.translate( 4, 0 );
  3579. this.context.moveTo( 0, 0 );
  3580. this.context.lineTo( iconSize - 4, iconSize / 2 );
  3581. this.context.lineTo( 0, iconSize );
  3582. this.context.fillStyle = '#fff';
  3583. this.context.fill();
  3584. }
  3585. this.context.restore();
  3586. };
  3587. Playback.prototype.on = function( type, listener ) {
  3588. this.canvas.addEventListener( type, listener, false );
  3589. };
  3590. Playback.prototype.off = function( type, listener ) {
  3591. this.canvas.removeEventListener( type, listener, false );
  3592. };
  3593. Playback.prototype.destroy = function() {
  3594. this.playing = false;
  3595. if( this.canvas.parentNode ) {
  3596. this.container.removeChild( this.canvas );
  3597. }
  3598. };
  3599. // --------------------------------------------------------------------//
  3600. // ------------------------------- API --------------------------------//
  3601. // --------------------------------------------------------------------//
  3602. Reveal = {
  3603. VERSION: VERSION,
  3604. initialize: initialize,
  3605. configure: configure,
  3606. sync: sync,
  3607. // Navigation methods
  3608. slide: slide,
  3609. left: navigateLeft,
  3610. right: navigateRight,
  3611. up: navigateUp,
  3612. down: navigateDown,
  3613. prev: navigatePrev,
  3614. next: navigateNext,
  3615. // Fragment methods
  3616. navigateFragment: navigateFragment,
  3617. prevFragment: previousFragment,
  3618. nextFragment: nextFragment,
  3619. // Deprecated aliases
  3620. navigateTo: slide,
  3621. navigateLeft: navigateLeft,
  3622. navigateRight: navigateRight,
  3623. navigateUp: navigateUp,
  3624. navigateDown: navigateDown,
  3625. navigatePrev: navigatePrev,
  3626. navigateNext: navigateNext,
  3627. // Shows a help overlay with keyboard shortcuts
  3628. showHelp: showHelp,
  3629. // Forces an update in slide layout
  3630. layout: layout,
  3631. // Randomizes the order of slides
  3632. shuffle: shuffle,
  3633. // Returns an object with the available routes as booleans (left/right/top/bottom)
  3634. availableRoutes: availableRoutes,
  3635. // Returns an object with the available fragments as booleans (prev/next)
  3636. availableFragments: availableFragments,
  3637. // Toggles the overview mode on/off
  3638. toggleOverview: toggleOverview,
  3639. // Toggles the "black screen" mode on/off
  3640. togglePause: togglePause,
  3641. // Toggles the auto slide mode on/off
  3642. toggleAutoSlide: toggleAutoSlide,
  3643. // State checks
  3644. isOverview: isOverview,
  3645. isPaused: isPaused,
  3646. isAutoSliding: isAutoSliding,
  3647. // Adds or removes all internal event listeners (such as keyboard)
  3648. addEventListeners: addEventListeners,
  3649. removeEventListeners: removeEventListeners,
  3650. // Facility for persisting and restoring the presentation state
  3651. getState: getState,
  3652. setState: setState,
  3653. // Presentation progress on range of 0-1
  3654. getProgress: getProgress,
  3655. // Returns the indices of the current, or specified, slide
  3656. getIndices: getIndices,
  3657. getTotalSlides: getTotalSlides,
  3658. // Returns the slide element at the specified index
  3659. getSlide: getSlide,
  3660. // Returns the slide background element at the specified index
  3661. getSlideBackground: getSlideBackground,
  3662. // Returns the speaker notes string for a slide, or null
  3663. getSlideNotes: getSlideNotes,
  3664. // Returns the previous slide element, may be null
  3665. getPreviousSlide: function() {
  3666. return previousSlide;
  3667. },
  3668. // Returns the current slide element
  3669. getCurrentSlide: function() {
  3670. return currentSlide;
  3671. },
  3672. // Returns the current scale of the presentation content
  3673. getScale: function() {
  3674. return scale;
  3675. },
  3676. // Returns the current configuration object
  3677. getConfig: function() {
  3678. return config;
  3679. },
  3680. // Helper method, retrieves query string as a key/value hash
  3681. getQueryHash: function() {
  3682. var query = {};
  3683. location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
  3684. query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
  3685. } );
  3686. // Basic deserialization
  3687. for( var i in query ) {
  3688. var value = query[ i ];
  3689. query[ i ] = deserialize( unescape( value ) );
  3690. }
  3691. return query;
  3692. },
  3693. // Returns true if we're currently on the first slide
  3694. isFirstSlide: function() {
  3695. return ( indexh === 0 && indexv === 0 );
  3696. },
  3697. // Returns true if we're currently on the last slide
  3698. isLastSlide: function() {
  3699. if( currentSlide ) {
  3700. // Does this slide has next a sibling?
  3701. if( currentSlide.nextElementSibling ) return false;
  3702. // If it's vertical, does its parent have a next sibling?
  3703. if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
  3704. return true;
  3705. }
  3706. return false;
  3707. },
  3708. // Checks if reveal.js has been loaded and is ready for use
  3709. isReady: function() {
  3710. return loaded;
  3711. },
  3712. // Forward event binding to the reveal DOM element
  3713. addEventListener: function( type, listener, useCapture ) {
  3714. if( 'addEventListener' in window ) {
  3715. ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
  3716. }
  3717. },
  3718. removeEventListener: function( type, listener, useCapture ) {
  3719. if( 'addEventListener' in window ) {
  3720. ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
  3721. }
  3722. },
  3723. // Programatically triggers a keyboard event
  3724. triggerKey: function( keyCode ) {
  3725. onDocumentKeyDown( { keyCode: keyCode } );
  3726. },
  3727. // Registers a new shortcut to include in the help overlay
  3728. registerKeyboardShortcut: function( key, value ) {
  3729. keyboardShortcuts[key] = value;
  3730. }
  3731. };
  3732. return Reveal;
  3733. }));