From 83b56d1270cdb179b64a1be51f8c1e7fe586c35e Mon Sep 17 00:00:00 2001 From: Marvin Borner Date: Mon, 1 Apr 2019 20:16:24 +0200 Subject: Added content --- js/reveal.js | 10795 +++++++++++++++++++++++++++++---------------------------- 1 file changed, 5428 insertions(+), 5367 deletions(-) (limited to 'js/reveal.js') diff --git a/js/reveal.js b/js/reveal.js index 3c31b97..5151bf7 100644 --- a/js/reveal.js +++ b/js/reveal.js @@ -5,5573 +5,5634 @@ * * Copyright (C) 2018 Hakim El Hattab, http://hakim.se */ -(function( root, factory ) { - if( typeof define === 'function' && define.amd ) { - // AMD. Register as an anonymous module. - define( function() { - root.Reveal = factory(); - return root.Reveal; - } ); - } else if( typeof exports === 'object' ) { - // Node. Does not work with strict CommonJS. - module.exports = factory(); - } else { - // Browser globals. - root.Reveal = factory(); - } -}( this, function() { +(function (root, factory) { + if (typeof define === 'function' && define.amd) { + // AMD. Register as an anonymous module. + define(function () { + root.Reveal = factory(); + return root.Reveal; + }); + } else if (typeof exports === 'object') { + // Node. Does not work with strict CommonJS. + module.exports = factory(); + } else { + // Browser globals. + root.Reveal = factory(); + } +}(this, function () { - 'use strict'; + 'use strict'; - var Reveal; + var Reveal; - // The reveal.js version - var VERSION = '3.7.0'; + // The reveal.js version + var VERSION = '3.7.0'; - var SLIDES_SELECTOR = '.slides section', - HORIZONTAL_SLIDES_SELECTOR = '.slides>section', - VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section', - HOME_SLIDE_SELECTOR = '.slides>section:first-of-type', - UA = navigator.userAgent, + var SLIDES_SELECTOR = '.slides section', + HORIZONTAL_SLIDES_SELECTOR = '.slides>section', + VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section', + HOME_SLIDE_SELECTOR = '.slides>section:first-of-type', + UA = navigator.userAgent, - // Configuration defaults, can be overridden at initialization time - config = { + // Configuration defaults, can be overridden at initialization time + config = { - // The "normal" size of the presentation, aspect ratio will be preserved - // when the presentation is scaled to fit different resolutions - width: 960, - height: 700, + // The "normal" size of the presentation, aspect ratio will be preserved + // when the presentation is scaled to fit different resolutions + width: 960, + height: 700, - // Factor of the display size that should remain empty around the content - margin: 0.04, + // Factor of the display size that should remain empty around the content + margin: 0.04, - // Bounds for smallest/largest possible scale to apply to content - minScale: 0.2, - maxScale: 2.0, + // Bounds for smallest/largest possible scale to apply to content + minScale: 0.2, + maxScale: 2.0, - // Display presentation control arrows - controls: true, + // Display presentation control arrows + controls: true, - // Help the user learn the controls by providing hints, for example by - // bouncing the down arrow when they first encounter a vertical slide - controlsTutorial: true, + // Help the user learn the controls by providing hints, for example by + // bouncing the down arrow when they first encounter a vertical slide + controlsTutorial: true, - // Determines where controls appear, "edges" or "bottom-right" - controlsLayout: 'bottom-right', + // Determines where controls appear, "edges" or "bottom-right" + controlsLayout: 'bottom-right', - // Visibility rule for backwards navigation arrows; "faded", "hidden" - // or "visible" - controlsBackArrows: 'faded', + // Visibility rule for backwards navigation arrows; "faded", "hidden" + // or "visible" + controlsBackArrows: 'faded', - // Display a presentation progress bar - progress: true, + // Display a presentation progress bar + progress: true, - // Display the page number of the current slide - slideNumber: false, + // Display the page number of the current slide + slideNumber: false, - // Use 1 based indexing for # links to match slide number (default is zero - // based) - hashOneBasedIndex: false, + // Use 1 based indexing for # links to match slide number (default is zero + // based) + hashOneBasedIndex: false, - // Determine which displays to show the slide number on - showSlideNumber: 'all', + // Determine which displays to show the slide number on + showSlideNumber: 'all', - // Push each slide change to the browser history - history: false, + // Push each slide change to the browser history + history: false, - // Enable keyboard shortcuts for navigation - keyboard: true, + // Enable keyboard shortcuts for navigation + keyboard: true, - // Optional function that blocks keyboard events when retuning false - keyboardCondition: null, + // Optional function that blocks keyboard events when retuning false + keyboardCondition: null, - // Enable the slide overview mode - overview: true, + // Enable the slide overview mode + overview: true, - // Disables the default reveal.js slide layout so that you can use - // custom CSS layout - disableLayout: false, + // Disables the default reveal.js slide layout so that you can use + // custom CSS layout + disableLayout: false, - // Vertical centering of slides - center: true, + // Vertical centering of slides + center: true, - // Enables touch navigation on devices with touch input - touch: true, + // Enables touch navigation on devices with touch input + touch: true, - // Loop the presentation - loop: false, + // Loop the presentation + loop: false, - // Change the presentation direction to be RTL - rtl: false, + // Change the presentation direction to be RTL + rtl: false, - // Randomizes the order of slides each time the presentation loads - shuffle: false, + // Randomizes the order of slides each time the presentation loads + shuffle: false, - // Turns fragments on and off globally - fragments: true, + // Turns fragments on and off globally + fragments: true, - // Flags whether to include the current fragment in the URL, - // so that reloading brings you to the same fragment position - fragmentInURL: false, + // Flags whether to include the current fragment in the URL, + // so that reloading brings you to the same fragment position + fragmentInURL: false, - // Flags if the presentation is running in an embedded mode, - // i.e. contained within a limited portion of the screen - embedded: false, + // Flags if the presentation is running in an embedded mode, + // i.e. contained within a limited portion of the screen + embedded: false, - // Flags if we should show a help overlay when the question-mark - // key is pressed - help: true, + // Flags if we should show a help overlay when the question-mark + // key is pressed + help: true, - // Flags if it should be possible to pause the presentation (blackout) - pause: true, + // Flags if it should be possible to pause the presentation (blackout) + pause: true, - // Flags if speaker notes should be visible to all viewers - showNotes: false, + // Flags if speaker notes should be visible to all viewers + showNotes: false, - // Global override for autolaying embedded media (video/audio/iframe) - // - null: Media will only autoplay if data-autoplay is present - // - true: All media will autoplay, regardless of individual setting - // - false: No media will autoplay, regardless of individual setting - autoPlayMedia: null, + // Global override for autolaying embedded media (video/audio/iframe) + // - null: Media will only autoplay if data-autoplay is present + // - true: All media will autoplay, regardless of individual setting + // - false: No media will autoplay, regardless of individual setting + autoPlayMedia: null, - // Controls automatic progression to the next slide - // - 0: Auto-sliding only happens if the data-autoslide HTML attribute - // is present on the current slide or fragment - // - 1+: All slides will progress automatically at the given interval - // - false: No auto-sliding, even if data-autoslide is present - autoSlide: 0, + // Controls automatic progression to the next slide + // - 0: Auto-sliding only happens if the data-autoslide HTML attribute + // is present on the current slide or fragment + // - 1+: All slides will progress automatically at the given interval + // - false: No auto-sliding, even if data-autoslide is present + autoSlide: 0, - // Stop auto-sliding after user input - autoSlideStoppable: true, + // Stop auto-sliding after user input + autoSlideStoppable: true, - // Use this method for navigation when auto-sliding (defaults to navigateNext) - autoSlideMethod: null, + // Use this method for navigation when auto-sliding (defaults to navigateNext) + autoSlideMethod: null, - // Specify the average time in seconds that you think you will spend - // presenting each slide. This is used to show a pacing timer in the - // speaker view - defaultTiming: null, + // Specify the average time in seconds that you think you will spend + // presenting each slide. This is used to show a pacing timer in the + // speaker view + defaultTiming: null, - // Enable slide navigation via mouse wheel - mouseWheel: false, + // Enable slide navigation via mouse wheel + mouseWheel: false, - // Apply a 3D roll to links on hover - rollingLinks: false, + // Apply a 3D roll to links on hover + rollingLinks: false, - // Hides the address bar on mobile devices - hideAddressBar: true, + // Hides the address bar on mobile devices + hideAddressBar: true, - // Opens links in an iframe preview overlay - // Add `data-preview-link` and `data-preview-link="false"` to customise each link - // individually - previewLinks: false, + // Opens links in an iframe preview overlay + // Add `data-preview-link` and `data-preview-link="false"` to customise each link + // individually + previewLinks: false, - // Exposes the reveal.js API through window.postMessage - postMessage: true, + // Exposes the reveal.js API through window.postMessage + postMessage: true, - // Dispatches all reveal.js events to the parent window through postMessage - postMessageEvents: false, + // Dispatches all reveal.js events to the parent window through postMessage + postMessageEvents: false, - // Focuses body when page changes visibility to ensure keyboard shortcuts work - focusBodyOnPageVisibilityChange: true, + // Focuses body when page changes visibility to ensure keyboard shortcuts work + focusBodyOnPageVisibilityChange: true, - // Transition style - transition: 'slide', // none/fade/slide/convex/concave/zoom + // Transition style + transition: 'slide', // none/fade/slide/convex/concave/zoom - // Transition speed - transitionSpeed: 'default', // default/fast/slow + // Transition speed + transitionSpeed: 'default', // default/fast/slow - // Transition style for full page slide backgrounds - backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom + // Transition style for full page slide backgrounds + backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom - // Parallax background image - parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg" + // Parallax background image + parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg" - // Parallax background size - parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px" + // Parallax background size + parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px" - // Parallax background repeat - parallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit + // Parallax background repeat + parallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit - // Parallax background position - parallaxBackgroundPosition: '', // CSS syntax, e.g. "top left" + // Parallax background position + parallaxBackgroundPosition: '', // CSS syntax, e.g. "top left" - // Amount of pixels to move the parallax background per slide step - parallaxBackgroundHorizontal: null, - parallaxBackgroundVertical: null, + // Amount of pixels to move the parallax background per slide step + parallaxBackgroundHorizontal: null, + parallaxBackgroundVertical: null, - // The maximum number of pages a single slide can expand onto when printing - // to PDF, unlimited by default - pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY, + // The maximum number of pages a single slide can expand onto when printing + // to PDF, unlimited by default + pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY, - // Prints each fragment on a separate slide - pdfSeparateFragments: true, + // Prints each fragment on a separate slide + pdfSeparateFragments: true, - // Offset used to reduce the height of content within exported PDF pages. - // This exists to account for environment differences based on how you - // print to PDF. CLI printing options, like phantomjs and wkpdf, can end - // on precisely the total height of the document whereas in-browser - // printing has to end one pixel before. - pdfPageHeightOffset: -1, + // Offset used to reduce the height of content within exported PDF pages. + // This exists to account for environment differences based on how you + // print to PDF. CLI printing options, like phantomjs and wkpdf, can end + // on precisely the total height of the document whereas in-browser + // printing has to end one pixel before. + pdfPageHeightOffset: -1, - // Number of slides away from the current that are visible - viewDistance: 3, + // Number of slides away from the current that are visible + viewDistance: 3, - // The display mode that will be used to show slides - display: 'block', + // The display mode that will be used to show slides + display: 'block', - // Script dependencies to load - dependencies: [] + // Script dependencies to load + dependencies: [] - }, + }, - // Flags if Reveal.initialize() has been called - initialized = false, + // Flags if Reveal.initialize() has been called + initialized = false, - // Flags if reveal.js is loaded (has dispatched the 'ready' event) - loaded = false, + // Flags if reveal.js is loaded (has dispatched the 'ready' event) + loaded = false, - // Flags if the overview mode is currently active - overview = false, + // Flags if the overview mode is currently active + overview = false, - // Holds the dimensions of our overview slides, including margins - overviewSlideWidth = null, - overviewSlideHeight = null, + // Holds the dimensions of our overview slides, including margins + overviewSlideWidth = null, + overviewSlideHeight = null, - // The horizontal and vertical index of the currently active slide - indexh, - indexv, + // The horizontal and vertical index of the currently active slide + indexh, + indexv, - // The previous and current slide HTML elements - previousSlide, - currentSlide, + // The previous and current slide HTML elements + previousSlide, + currentSlide, - previousBackground, + previousBackground, - // Remember which directions that the user has navigated towards - hasNavigatedRight = false, - hasNavigatedDown = false, + // Remember which directions that the user has navigated towards + hasNavigatedRight = false, + hasNavigatedDown = false, - // Slides may hold a data-state attribute which we pick up and apply - // as a class to the body. This list contains the combined state of - // all current slides. - state = [], + // Slides may hold a data-state attribute which we pick up and apply + // as a class to the body. This list contains the combined state of + // all current slides. + state = [], - // The current scale of the presentation (see width/height config) - scale = 1, + // The current scale of the presentation (see width/height config) + scale = 1, - // CSS transform that is currently applied to the slides container, - // split into two groups - slidesTransform = { layout: '', overview: '' }, + // CSS transform that is currently applied to the slides container, + // split into two groups + slidesTransform = {layout: '', overview: ''}, - // Cached references to DOM elements - dom = {}, + // Cached references to DOM elements + dom = {}, - // Features supported by the browser, see #checkCapabilities() - features = {}, + // Features supported by the browser, see #checkCapabilities() + features = {}, - // Client is a mobile device, see #checkCapabilities() - isMobileDevice, + // Client is a mobile device, see #checkCapabilities() + isMobileDevice, - // Client is a desktop Chrome, see #checkCapabilities() - isChrome, + // Client is a desktop Chrome, see #checkCapabilities() + isChrome, - // Throttles mouse wheel navigation - lastMouseWheelStep = 0, + // Throttles mouse wheel navigation + lastMouseWheelStep = 0, - // Delays updates to the URL due to a Chrome thumbnailer bug - writeURLTimeout = 0, + // Delays updates to the URL due to a Chrome thumbnailer bug + writeURLTimeout = 0, - // Flags if the interaction event listeners are bound - eventsAreBound = false, + // Flags if the interaction event listeners are bound + eventsAreBound = false, - // The current auto-slide duration - autoSlide = 0, + // The current auto-slide duration + autoSlide = 0, - // Auto slide properties - autoSlidePlayer, - autoSlideTimeout = 0, - autoSlideStartTime = -1, - autoSlidePaused = false, + // Auto slide properties + autoSlidePlayer, + autoSlideTimeout = 0, + autoSlideStartTime = -1, + autoSlidePaused = false, - // Holds information about the currently ongoing touch input - touch = { - startX: 0, - startY: 0, - startSpan: 0, - startCount: 0, - captured: false, - threshold: 40 - }, + // Holds information about the currently ongoing touch input + touch = { + startX: 0, + startY: 0, + startSpan: 0, + startCount: 0, + captured: false, + threshold: 40 + }, - // Holds information about the keyboard shortcuts - keyboardShortcuts = { - 'N , SPACE': 'Next slide', - 'P': 'Previous slide', - '← , H': 'Navigate left', - '→ , L': 'Navigate right', - '↑ , K': 'Navigate up', - '↓ , J': 'Navigate down', - 'Home': 'First slide', - 'End': 'Last slide', - 'B , .': 'Pause', - 'F': 'Fullscreen', - 'ESC, O': 'Slide overview' - }, + // Holds information about the keyboard shortcuts + keyboardShortcuts = { + 'N , SPACE': 'Next slide', + 'P': 'Previous slide', + '← , H': 'Navigate left', + '→ , L': 'Navigate right', + '↑ , K': 'Navigate up', + '↓ , J': 'Navigate down', + 'Home': 'First slide', + 'End': 'Last slide', + 'B , .': 'Pause', + 'F': 'Fullscreen', + 'ESC, O': 'Slide overview' + }, - // Holds custom key code mappings - registeredKeyBindings = {}; + // Holds custom key code mappings + registeredKeyBindings = {}; - /** - * Starts up the presentation if the client is capable. - */ - function initialize( options ) { + /** + * Starts up the presentation if the client is capable. + */ + function initialize(options) { - // Make sure we only initialize once - if( initialized === true ) return; - - initialized = true; - - checkCapabilities(); - - if( !features.transforms2d && !features.transforms3d ) { - document.body.setAttribute( 'class', 'no-transforms' ); - - // Since JS won't be running any further, we load all lazy - // loading elements upfront - var images = toArray( document.getElementsByTagName( 'img' ) ), - iframes = toArray( document.getElementsByTagName( 'iframe' ) ); - - var lazyLoadable = images.concat( iframes ); - - for( var i = 0, len = lazyLoadable.length; i < len; i++ ) { - var element = lazyLoadable[i]; - if( element.getAttribute( 'data-src' ) ) { - element.setAttribute( 'src', element.getAttribute( 'data-src' ) ); - element.removeAttribute( 'data-src' ); - } - } - - // If the browser doesn't support core features we won't be - // using JavaScript to control the presentation - return; - } - - // Cache references to key DOM elements - dom.wrapper = document.querySelector( '.reveal' ); - dom.slides = document.querySelector( '.reveal .slides' ); - - // Force a layout when the whole page, incl fonts, has loaded - window.addEventListener( 'load', layout, false ); - - var query = Reveal.getQueryHash(); - - // Do not accept new dependencies via query config to avoid - // the potential of malicious script injection - if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies']; - - // Copy options over to our config object - extend( config, options ); - extend( config, query ); - - // Hide the address bar in mobile browsers - hideAddressBar(); - - // Loads the dependencies and continues to #start() once done - load(); - - } - - /** - * Inspect the client to see what it's capable of, this - * should only happens once per runtime. - */ - function checkCapabilities() { - - isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA ); - isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA ); - - var testElement = document.createElement( 'div' ); - - features.transforms3d = 'WebkitPerspective' in testElement.style || - 'MozPerspective' in testElement.style || - 'msPerspective' in testElement.style || - 'OPerspective' in testElement.style || - 'perspective' in testElement.style; - - features.transforms2d = 'WebkitTransform' in testElement.style || - 'MozTransform' in testElement.style || - 'msTransform' in testElement.style || - 'OTransform' in testElement.style || - 'transform' in testElement.style; - - features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame; - features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function'; - - features.canvas = !!document.createElement( 'canvas' ).getContext; - - // Transitions in the overview are disabled in desktop and - // Safari due to lag - features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA ); - - // Flags if we should use zoom instead of transform to scale - // up slides. Zoom produces crisper results but has a lot of - // xbrowser quirks so we only use it in whitelsited browsers. - features.zoom = 'zoom' in testElement.style && !isMobileDevice && - ( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) ); - - } + // Make sure we only initialize once + if (initialized === true) return; + + initialized = true; + + checkCapabilities(); + + if (!features.transforms2d && !features.transforms3d) { + document.body.setAttribute('class', 'no-transforms'); + + // Since JS won't be running any further, we load all lazy + // loading elements upfront + var images = toArray(document.getElementsByTagName('img')), + iframes = toArray(document.getElementsByTagName('iframe')); + + var lazyLoadable = images.concat(iframes); + + for (var i = 0, len = lazyLoadable.length; i < len; i++) { + var element = lazyLoadable[i]; + if (element.getAttribute('data-src')) { + element.setAttribute('src', element.getAttribute('data-src')); + element.removeAttribute('data-src'); + } + } + + // If the browser doesn't support core features we won't be + // using JavaScript to control the presentation + return; + } + + // Cache references to key DOM elements + dom.wrapper = document.querySelector('.reveal'); + dom.slides = document.querySelector('.reveal .slides'); + + // Force a layout when the whole page, incl fonts, has loaded + window.addEventListener('load', layout, false); + + var query = Reveal.getQueryHash(); + + // Do not accept new dependencies via query config to avoid + // the potential of malicious script injection + if (typeof query['dependencies'] !== 'undefined') delete query['dependencies']; + + // Copy options over to our config object + extend(config, options); + extend(config, query); + + // Hide the address bar in mobile browsers + hideAddressBar(); + + // Loads the dependencies and continues to #start() once done + load(); + + } + + /** + * Inspect the client to see what it's capable of, this + * should only happens once per runtime. + */ + function checkCapabilities() { + + isMobileDevice = /(iphone|ipod|ipad|android)/gi.test(UA); + isChrome = /chrome/i.test(UA) && !/edge/i.test(UA); + + var testElement = document.createElement('div'); + + features.transforms3d = 'WebkitPerspective' in testElement.style || + 'MozPerspective' in testElement.style || + 'msPerspective' in testElement.style || + 'OPerspective' in testElement.style || + 'perspective' in testElement.style; + + features.transforms2d = 'WebkitTransform' in testElement.style || + 'MozTransform' in testElement.style || + 'msTransform' in testElement.style || + 'OTransform' in testElement.style || + 'transform' in testElement.style; + + features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame; + features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function'; + + features.canvas = !!document.createElement('canvas').getContext; + + // Transitions in the overview are disabled in desktop and + // Safari due to lag + features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test(UA); - /** - * Loads the dependencies of reveal.js. Dependencies are - * defined via the configuration option 'dependencies' - * and will be loaded prior to starting/binding reveal.js. - * Some dependencies may have an 'async' flag, if so they - * will load after reveal.js has been started up. - */ - function load() { - - var scripts = [], - scriptsAsync = [], - scriptsToPreload = 0; - - // Called once synchronous scripts finish loading - function proceed() { - if( scriptsAsync.length ) { - // Load asynchronous scripts - head.js.apply( null, scriptsAsync ); - } - - start(); - } - - function loadScript( s ) { - head.ready( s.src.match( /([\w\d_\-]*)\.?js(\?[\w\d.=&]*)?$|[^\\\/]*$/i )[0], function() { - // Extension may contain callback functions - if( typeof s.callback === 'function' ) { - s.callback.apply( this ); - } - - if( --scriptsToPreload === 0 ) { - proceed(); - } - }); - } - - for( var i = 0, len = config.dependencies.length; i < len; i++ ) { - var s = config.dependencies[i]; - - // Load if there's no condition or the condition is truthy - if( !s.condition || s.condition() ) { - if( s.async ) { - scriptsAsync.push( s.src ); - } - else { - scripts.push( s.src ); - } - - loadScript( s ); - } - } - - if( scripts.length ) { - scriptsToPreload = scripts.length; - - // Load synchronous scripts - head.js.apply( null, scripts ); - } - else { - proceed(); - } - - } - - /** - * Starts up reveal.js by binding input events and navigating - * to the current URL deeplink if there is one. - */ - function start() { - - loaded = true; - - // Make sure we've got all the DOM elements we need - setupDOM(); - - // Listen to messages posted to this window - setupPostMessage(); - - // Prevent the slides from being scrolled out of view - setupScrollPrevention(); - - // Resets all vertical slides so that only the first is visible - resetVerticalSlides(); - - // Updates the presentation to match the current configuration values - configure(); - - // Read the initial hash - readURL(); - - // Update all backgrounds - updateBackground( true ); - - // Notify listeners that the presentation is ready but use a 1ms - // timeout to ensure it's not fired synchronously after #initialize() - setTimeout( function() { - // Enable transitions now that we're loaded - dom.slides.classList.remove( 'no-transition' ); - - dom.wrapper.classList.add( 'ready' ); - - dispatchEvent( 'ready', { - 'indexh': indexh, - 'indexv': indexv, - 'currentSlide': currentSlide - } ); - }, 1 ); - - // Special setup and config is required when printing to PDF - if( isPrintingPDF() ) { - removeEventListeners(); - - // The document needs to have loaded for the PDF layout - // measurements to be accurate - if( document.readyState === 'complete' ) { - setupPDF(); - } - else { - window.addEventListener( 'load', setupPDF ); - } - } - - } - - /** - * Finds and stores references to DOM elements which are - * required by the presentation. If a required element is - * not found, it is created. - */ - function setupDOM() { - - // Prevent transitions while we're loading - dom.slides.classList.add( 'no-transition' ); - - if( isMobileDevice ) { - dom.wrapper.classList.add( 'no-hover' ); - } - else { - dom.wrapper.classList.remove( 'no-hover' ); - } - - if( /iphone/gi.test( UA ) ) { - dom.wrapper.classList.add( 'ua-iphone' ); - } - else { - dom.wrapper.classList.remove( 'ua-iphone' ); - } - - // Background element - dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null ); - - // Progress bar - dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '' ); - dom.progressbar = dom.progress.querySelector( 'span' ); - - // Arrow controls - dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls', - '' + - '' + - '' + - '' ); - - // Slide number - dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' ); - - // Element containing notes that are visible to the audience - dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null ); - dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' ); - dom.speakerNotes.setAttribute( 'tabindex', '0' ); - - // Overlay graphic which is displayed during the paused mode - dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', '' ); - dom.resumeButton = dom.pauseOverlay.querySelector( '.resume-button' ); - - dom.wrapper.setAttribute( 'role', 'application' ); - - // There can be multiple instances of controls throughout the page - dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) ); - dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) ); - dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) ); - dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) ); - dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) ); - dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) ); - - // The right and down arrows in the standard reveal.js controls - dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' ); - dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' ); - - dom.statusDiv = createStatusDiv(); - } - - /** - * Creates a hidden div with role aria-live to announce the - * current slide content. Hide the div off-screen to make it - * available only to Assistive Technologies. - * - * @return {HTMLElement} - */ - function createStatusDiv() { - - var statusDiv = document.getElementById( 'aria-status-div' ); - if( !statusDiv ) { - statusDiv = document.createElement( 'div' ); - statusDiv.style.position = 'absolute'; - statusDiv.style.height = '1px'; - statusDiv.style.width = '1px'; - statusDiv.style.overflow = 'hidden'; - statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )'; - statusDiv.setAttribute( 'id', 'aria-status-div' ); - statusDiv.setAttribute( 'aria-live', 'polite' ); - statusDiv.setAttribute( 'aria-atomic','true' ); - dom.wrapper.appendChild( statusDiv ); - } - return statusDiv; - - } - - /** - * Converts the given HTML element into a string of text - * that can be announced to a screen reader. Hidden - * elements are excluded. - */ - function getStatusText( node ) { - - var text = ''; - - // Text node - if( node.nodeType === 3 ) { - text += node.textContent; - } - // Element node - else if( node.nodeType === 1 ) { - - var isAriaHidden = node.getAttribute( 'aria-hidden' ); - var isDisplayHidden = window.getComputedStyle( node )['display'] === 'none'; - if( isAriaHidden !== 'true' && !isDisplayHidden ) { - - toArray( node.childNodes ).forEach( function( child ) { - text += getStatusText( child ); - } ); - - } - - } - - return text; - - } - - /** - * Configures the presentation for printing to a static - * PDF. - */ - function setupPDF() { - - var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight ); - - // Dimensions of the PDF pages - var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ), - pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) ); - - // Dimensions of slides within the pages - var slideWidth = slideSize.width, - slideHeight = slideSize.height; - - // Let the browser know what page size we want to print - injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' ); - - // Limit the size of certain elements to the dimensions of the slide - injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' ); - - document.body.classList.add( 'print-pdf' ); - document.body.style.width = pageWidth + 'px'; - document.body.style.height = pageHeight + 'px'; - - // Make sure stretch elements fit on slide - layoutSlideContents( slideWidth, slideHeight ); - - // Add each slide's index as attributes on itself, we need these - // indices to generate slide numbers below - toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) { - hslide.setAttribute( 'data-index-h', h ); - - if( hslide.classList.contains( 'stack' ) ) { - toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) { - vslide.setAttribute( 'data-index-h', h ); - vslide.setAttribute( 'data-index-v', v ); - } ); - } - } ); - - // Slide and slide background layout - toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) { - - // Vertical stacks are not centred since their section - // children will be - if( slide.classList.contains( 'stack' ) === false ) { - // Center the slide inside of the page, giving the slide some margin - var left = ( pageWidth - slideWidth ) / 2, - top = ( pageHeight - slideHeight ) / 2; - - var contentHeight = slide.scrollHeight; - var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 ); - - // Adhere to configured pages per slide limit - numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide ); - - // Center slides vertically - if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) { - top = Math.max( ( pageHeight - contentHeight ) / 2, 0 ); - } - - // Wrap the slide in a page element and hide its overflow - // so that no page ever flows onto another - var page = document.createElement( 'div' ); - page.className = 'pdf-page'; - page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px'; - slide.parentNode.insertBefore( page, slide ); - page.appendChild( slide ); - - // Position the slide inside of the page - slide.style.left = left + 'px'; - slide.style.top = top + 'px'; - slide.style.width = slideWidth + 'px'; - - if( slide.slideBackgroundElement ) { - page.insertBefore( slide.slideBackgroundElement, slide ); - } - - // Inject notes if `showNotes` is enabled - if( config.showNotes ) { - - // Are there notes for this slide? - var notes = getSlideNotes( slide ); - if( notes ) { - - var notesSpacing = 8; - var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline'; - var notesElement = document.createElement( 'div' ); - notesElement.classList.add( 'speaker-notes' ); - notesElement.classList.add( 'speaker-notes-pdf' ); - notesElement.setAttribute( 'data-layout', notesLayout ); - notesElement.innerHTML = notes; - - if( notesLayout === 'separate-page' ) { - page.parentNode.insertBefore( notesElement, page.nextSibling ); - } - else { - notesElement.style.left = notesSpacing + 'px'; - notesElement.style.bottom = notesSpacing + 'px'; - notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px'; - page.appendChild( notesElement ); - } - - } - - } - - // Inject slide numbers if `slideNumbers` are enabled - if( config.slideNumber && /all|print/i.test( config.showSlideNumber ) ) { - var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1, - slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1; - - var numberElement = document.createElement( 'div' ); - numberElement.classList.add( 'slide-number' ); - numberElement.classList.add( 'slide-number-pdf' ); - numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV ); - page.appendChild( numberElement ); - } - - // Copy page and show fragments one after another - if( config.pdfSeparateFragments ) { - - // Each fragment 'group' is an array containing one or more - // fragments. Multiple fragments that appear at the same time - // are part of the same group. - var fragmentGroups = sortFragments( page.querySelectorAll( '.fragment' ), true ); - - var previousFragmentStep; - var previousPage; - - fragmentGroups.forEach( function( fragments ) { - - // Remove 'current-fragment' from the previous group - if( previousFragmentStep ) { - previousFragmentStep.forEach( function( fragment ) { - fragment.classList.remove( 'current-fragment' ); - } ); - } - - // Show the fragments for the current index - fragments.forEach( function( fragment ) { - fragment.classList.add( 'visible', 'current-fragment' ); - } ); - - // Create a separate page for the current fragment state - var clonedPage = page.cloneNode( true ); - page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling ); - - previousFragmentStep = fragments; - previousPage = clonedPage; - - } ); - - // Reset the first/original page so that all fragments are hidden - fragmentGroups.forEach( function( fragments ) { - fragments.forEach( function( fragment ) { - fragment.classList.remove( 'visible', 'current-fragment' ); - } ); - } ); - - } - // Show all fragments - else { - toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) { - fragment.classList.add( 'visible' ); - } ); - } - - } - - } ); - - // Notify subscribers that the PDF layout is good to go - dispatchEvent( 'pdf-ready' ); - - } - - /** - * This is an unfortunate necessity. Some actions – such as - * an input field being focused in an iframe or using the - * keyboard to expand text selection beyond the bounds of - * a slide – can trigger our content to be pushed out of view. - * This scrolling can not be prevented by hiding overflow in - * CSS (we already do) so we have to resort to repeatedly - * checking if the slides have been offset :( - */ - function setupScrollPrevention() { - - setInterval( function() { - if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) { - dom.wrapper.scrollTop = 0; - dom.wrapper.scrollLeft = 0; - } - }, 1000 ); - - } - - /** - * Creates an HTML element and returns a reference to it. - * If the element already exists the existing instance will - * be returned. - * - * @param {HTMLElement} container - * @param {string} tagname - * @param {string} classname - * @param {string} innerHTML - * - * @return {HTMLElement} - */ - function createSingletonNode( container, tagname, classname, innerHTML ) { - - // Find all nodes matching the description - var nodes = container.querySelectorAll( '.' + classname ); - - // Check all matches to find one which is a direct child of - // the specified container - for( var i = 0; i < nodes.length; i++ ) { - var testNode = nodes[i]; - if( testNode.parentNode === container ) { - return testNode; - } - } - - // If no node was found, create it now - var node = document.createElement( tagname ); - node.className = classname; - if( typeof innerHTML === 'string' ) { - node.innerHTML = innerHTML; - } - container.appendChild( node ); - - return node; - - } - - /** - * Creates the slide background elements and appends them - * to the background container. One element is created per - * slide no matter if the given slide has visible background. - */ - function createBackgrounds() { - - var printMode = isPrintingPDF(); - - // Clear prior backgrounds - dom.background.innerHTML = ''; - dom.background.classList.add( 'no-transition' ); - - // Iterate over all horizontal slides - toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) { - - var backgroundStack = createBackground( slideh, dom.background ); - - // Iterate over all vertical slides - toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) { - - createBackground( slidev, backgroundStack ); - - backgroundStack.classList.add( 'stack' ); - - } ); - - } ); - - // Add parallax background if specified - if( config.parallaxBackgroundImage ) { - - dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")'; - dom.background.style.backgroundSize = config.parallaxBackgroundSize; - dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat; - dom.background.style.backgroundPosition = config.parallaxBackgroundPosition; - - // Make sure the below properties are set on the element - these properties are - // needed for proper transitions to be set on the element via CSS. To remove - // annoying background slide-in effect when the presentation starts, apply - // these properties after short time delay - setTimeout( function() { - dom.wrapper.classList.add( 'has-parallax-background' ); - }, 1 ); - - } - else { - - dom.background.style.backgroundImage = ''; - dom.wrapper.classList.remove( 'has-parallax-background' ); - - } - - } - - /** - * Creates a background for the given slide. - * - * @param {HTMLElement} slide - * @param {HTMLElement} container The element that the background - * should be appended to - * @return {HTMLElement} New background div - */ - function createBackground( slide, container ) { - - - // Main slide background element - var element = document.createElement( 'div' ); - element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' ); - - // Inner background element that wraps images/videos/iframes - var contentElement = document.createElement( 'div' ); - contentElement.className = 'slide-background-content'; - - element.appendChild( contentElement ); - container.appendChild( element ); - - slide.slideBackgroundElement = element; - slide.slideBackgroundContentElement = contentElement; - - // Syncs the background to reflect all current background settings - syncBackground( slide ); - - return element; - - } - - /** - * Renders all of the visual properties of a slide background - * based on the various background attributes. - * - * @param {HTMLElement} slide - */ - function syncBackground( slide ) { - - var element = slide.slideBackgroundElement, - contentElement = slide.slideBackgroundContentElement; - - // Reset the prior background state in case this is not the - // initial sync - slide.classList.remove( 'has-dark-background' ); - slide.classList.remove( 'has-light-background' ); - - element.removeAttribute( 'data-loaded' ); - element.removeAttribute( 'data-background-hash' ); - element.removeAttribute( 'data-background-size' ); - element.removeAttribute( 'data-background-transition' ); - element.style.backgroundColor = ''; - - contentElement.style.backgroundSize = ''; - contentElement.style.backgroundRepeat = ''; - contentElement.style.backgroundPosition = ''; - contentElement.style.backgroundImage = ''; - contentElement.style.opacity = ''; - contentElement.innerHTML = ''; - - var data = { - background: slide.getAttribute( 'data-background' ), - backgroundSize: slide.getAttribute( 'data-background-size' ), - backgroundImage: slide.getAttribute( 'data-background-image' ), - backgroundVideo: slide.getAttribute( 'data-background-video' ), - backgroundIframe: slide.getAttribute( 'data-background-iframe' ), - backgroundColor: slide.getAttribute( 'data-background-color' ), - backgroundRepeat: slide.getAttribute( 'data-background-repeat' ), - backgroundPosition: slide.getAttribute( 'data-background-position' ), - backgroundTransition: slide.getAttribute( 'data-background-transition' ), - backgroundOpacity: slide.getAttribute( 'data-background-opacity' ) - }; - - if( data.background ) { - // Auto-wrap image urls in url(...) - if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) { - slide.setAttribute( 'data-background-image', data.background ); - } - else { - element.style.background = data.background; - } - } - - // Create a hash for this combination of background settings. - // This is used to determine when two slide backgrounds are - // the same. - if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) { - element.setAttribute( 'data-background-hash', data.background + - data.backgroundSize + - data.backgroundImage + - data.backgroundVideo + - data.backgroundIframe + - data.backgroundColor + - data.backgroundRepeat + - data.backgroundPosition + - data.backgroundTransition + - data.backgroundOpacity ); - } - - // Additional and optional background properties - if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize ); - if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor; - if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition ); - - // Background image options are set on the content wrapper - if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize; - if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat; - if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition; - if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity; - - // If this slide has a background color, add a class that - // signals if it is light or dark. If the slide has no background - // color, no class will be set - var computedBackgroundStyle = window.getComputedStyle( element ); - if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) { - var rgb = colorToRgb( computedBackgroundStyle.backgroundColor ); - - // Ignore fully transparent backgrounds. Some browsers return - // rgba(0,0,0,0) when reading the computed background color of - // an element with no background - if( rgb && rgb.a !== 0 ) { - if( colorBrightness( computedBackgroundStyle.backgroundColor ) < 128 ) { - slide.classList.add( 'has-dark-background' ); - } - else { - slide.classList.add( 'has-light-background' ); - } - } - } - - } - - /** - * Registers a listener to postMessage events, this makes it - * possible to call all reveal.js API methods from another - * window. For example: - * - * revealWindow.postMessage( JSON.stringify({ - * method: 'slide', - * args: [ 2 ] - * }), '*' ); - */ - function setupPostMessage() { - - if( config.postMessage ) { - window.addEventListener( 'message', function ( event ) { - var data = event.data; - - // Make sure we're dealing with JSON - if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) { - data = JSON.parse( data ); - - // Check if the requested method can be found - if( data.method && typeof Reveal[data.method] === 'function' ) { - Reveal[data.method].apply( Reveal, data.args ); - } - } - }, false ); - } - - } - - /** - * Applies the configuration settings from the config - * object. May be called multiple times. - * - * @param {object} options - */ - function configure( options ) { - - var oldTransition = config.transition; - - // New config options may be passed when this method - // is invoked through the API after initialization - if( typeof options === 'object' ) extend( config, options ); - - // Abort if reveal.js hasn't finished loading, config - // changes will be applied automatically once loading - // finishes - if( loaded === false ) return; - - var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length; - - // Remove the previously configured transition class - dom.wrapper.classList.remove( oldTransition ); - - // Force linear transition based on browser capabilities - if( features.transforms3d === false ) config.transition = 'linear'; - - dom.wrapper.classList.add( config.transition ); - - dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed ); - dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition ); - - dom.controls.style.display = config.controls ? 'block' : 'none'; - dom.progress.style.display = config.progress ? 'block' : 'none'; - - dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout ); - dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows ); - - if( config.shuffle ) { - shuffle(); - } - - if( config.rtl ) { - dom.wrapper.classList.add( 'rtl' ); - } - else { - dom.wrapper.classList.remove( 'rtl' ); - } - - if( config.center ) { - dom.wrapper.classList.add( 'center' ); - } - else { - dom.wrapper.classList.remove( 'center' ); - } - - // Exit the paused mode if it was configured off - if( config.pause === false ) { - resume(); - } - - if( config.showNotes ) { - dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' ); - } - - if( config.mouseWheel ) { - document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF - document.addEventListener( 'mousewheel', onDocumentMouseScroll, false ); - } - else { - document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF - document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false ); - } - - // Rolling 3D links - if( config.rollingLinks ) { - enableRollingLinks(); - } - else { - disableRollingLinks(); - } - - // Iframe link previews - if( config.previewLinks ) { - enablePreviewLinks(); - disablePreviewLinks( '[data-preview-link=false]' ); - } - else { - disablePreviewLinks(); - enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' ); - } - - // Remove existing auto-slide controls - if( autoSlidePlayer ) { - autoSlidePlayer.destroy(); - autoSlidePlayer = null; - } - - // Generate auto-slide controls if needed - if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) { - autoSlidePlayer = new Playback( dom.wrapper, function() { - return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 ); - } ); - - autoSlidePlayer.on( 'click', onAutoSlidePlayerClick ); - autoSlidePaused = false; - } - - // When fragments are turned off they should be visible - if( config.fragments === false ) { - toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) { - element.classList.add( 'visible' ); - element.classList.remove( 'current-fragment' ); - } ); - } - - // Slide numbers - var slideNumberDisplay = 'none'; - if( config.slideNumber && !isPrintingPDF() ) { - if( config.showSlideNumber === 'all' ) { - slideNumberDisplay = 'block'; - } - else if( config.showSlideNumber === 'speaker' && isSpeakerNotes() ) { - slideNumberDisplay = 'block'; - } - } - - dom.slideNumber.style.display = slideNumberDisplay; - - sync(); - - } - - /** - * Binds all event listeners. - */ - function addEventListeners() { - - eventsAreBound = true; - - window.addEventListener( 'hashchange', onWindowHashChange, false ); - window.addEventListener( 'resize', onWindowResize, false ); - - if( config.touch ) { - if( 'onpointerdown' in window ) { - // Use W3C pointer events - dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false ); - dom.wrapper.addEventListener( 'pointermove', onPointerMove, false ); - dom.wrapper.addEventListener( 'pointerup', onPointerUp, false ); - } - else if( window.navigator.msPointerEnabled ) { - // IE 10 uses prefixed version of pointer events - dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false ); - dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false ); - dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false ); - } - else { - // Fall back to touch events - dom.wrapper.addEventListener( 'touchstart', onTouchStart, false ); - dom.wrapper.addEventListener( 'touchmove', onTouchMove, false ); - dom.wrapper.addEventListener( 'touchend', onTouchEnd, false ); - } - } - - if( config.keyboard ) { - document.addEventListener( 'keydown', onDocumentKeyDown, false ); - document.addEventListener( 'keypress', onDocumentKeyPress, false ); - } - - if( config.progress && dom.progress ) { - dom.progress.addEventListener( 'click', onProgressClicked, false ); - } - - dom.resumeButton.addEventListener( 'click', resume, false ); - - if( config.focusBodyOnPageVisibilityChange ) { - var visibilityChange; - - if( 'hidden' in document ) { - visibilityChange = 'visibilitychange'; - } - else if( 'msHidden' in document ) { - visibilityChange = 'msvisibilitychange'; - } - else if( 'webkitHidden' in document ) { - visibilityChange = 'webkitvisibilitychange'; - } - - if( visibilityChange ) { - document.addEventListener( visibilityChange, onPageVisibilityChange, false ); - } - } - - // Listen to both touch and click events, in case the device - // supports both - var pointerEvents = [ 'touchstart', 'click' ]; - - // Only support touch for Android, fixes double navigations in - // stock browser - if( UA.match( /android/gi ) ) { - pointerEvents = [ 'touchstart' ]; - } - - pointerEvents.forEach( function( eventName ) { - dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } ); - dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } ); - dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } ); - dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } ); - dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } ); - dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } ); - } ); - - } - - /** - * Unbinds all event listeners. - */ - function removeEventListeners() { - - eventsAreBound = false; - - document.removeEventListener( 'keydown', onDocumentKeyDown, false ); - document.removeEventListener( 'keypress', onDocumentKeyPress, false ); - window.removeEventListener( 'hashchange', onWindowHashChange, false ); - window.removeEventListener( 'resize', onWindowResize, false ); - - dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false ); - dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false ); - dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false ); - - dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false ); - dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false ); - dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false ); - - dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false ); - dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false ); - dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false ); - - dom.resumeButton.removeEventListener( 'click', resume, false ); - - if ( config.progress && dom.progress ) { - dom.progress.removeEventListener( 'click', onProgressClicked, false ); - } - - [ 'touchstart', 'click' ].forEach( function( eventName ) { - dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } ); - dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } ); - dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } ); - dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } ); - dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } ); - dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } ); - } ); - - } - - /** - * Add a custom key binding with optional description to - * be added to the help screen. - */ - function addKeyBinding( binding, callback ) { - - if( typeof binding === 'object' && binding.keyCode ) { - registeredKeyBindings[binding.keyCode] = { - callback: callback, - key: binding.key, - description: binding.description - }; - } - else { - registeredKeyBindings[binding] = { - callback: callback, - key: null, - description: null - }; - } - - } - - /** - * Removes the specified custom key binding. - */ - function removeKeyBinding( keyCode ) { - - delete registeredKeyBindings[keyCode]; - - } - - /** - * Extend object a with the properties of object b. - * If there's a conflict, object b takes precedence. - * - * @param {object} a - * @param {object} b - */ - function extend( a, b ) { - - for( var i in b ) { - a[ i ] = b[ i ]; - } - - return a; - - } - - /** - * Converts the target object to an array. - * - * @param {object} o - * @return {object[]} - */ - function toArray( o ) { - - return Array.prototype.slice.call( o ); - - } - - /** - * Utility for deserializing a value. - * - * @param {*} value - * @return {*} - */ - function deserialize( value ) { - - if( typeof value === 'string' ) { - if( value === 'null' ) return null; - else if( value === 'true' ) return true; - else if( value === 'false' ) return false; - else if( value.match( /^-?[\d\.]+$/ ) ) return parseFloat( value ); - } - - return value; - - } - - /** - * Measures the distance in pixels between point a - * and point b. - * - * @param {object} a point with x/y properties - * @param {object} b point with x/y properties - * - * @return {number} - */ - function distanceBetween( a, b ) { - - var dx = a.x - b.x, - dy = a.y - b.y; - - return Math.sqrt( dx*dx + dy*dy ); - - } - - /** - * Applies a CSS transform to the target element. - * - * @param {HTMLElement} element - * @param {string} transform - */ - function transformElement( element, transform ) { - - element.style.WebkitTransform = transform; - element.style.MozTransform = transform; - element.style.msTransform = transform; - element.style.transform = transform; - - } - - /** - * Applies CSS transforms to the slides container. The container - * is transformed from two separate sources: layout and the overview - * mode. - * - * @param {object} transforms - */ - function transformSlides( transforms ) { - - // Pick up new transforms from arguments - if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout; - if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview; - - // Apply the transforms to the slides container - if( slidesTransform.layout ) { - transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview ); - } - else { - transformElement( dom.slides, slidesTransform.overview ); - } - - } - - /** - * Injects the given CSS styles into the DOM. - * - * @param {string} value - */ - function injectStyleSheet( value ) { - - var tag = document.createElement( 'style' ); - tag.type = 'text/css'; - if( tag.styleSheet ) { - tag.styleSheet.cssText = value; - } - else { - tag.appendChild( document.createTextNode( value ) ); - } - document.getElementsByTagName( 'head' )[0].appendChild( tag ); - - } - - /** - * Find the closest parent that matches the given - * selector. - * - * @param {HTMLElement} target The child element - * @param {String} selector The CSS selector to match - * the parents against - * - * @return {HTMLElement} The matched parent or null - * if no matching parent was found - */ - function closestParent( target, selector ) { - - var parent = target.parentNode; - - while( parent ) { - - // There's some overhead doing this each time, we don't - // want to rewrite the element prototype but should still - // be enough to feature detect once at startup... - var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector; - - // If we find a match, we're all set - if( matchesMethod && matchesMethod.call( parent, selector ) ) { - return parent; - } - - // Keep searching - parent = parent.parentNode; - - } - - return null; - - } - - /** - * Converts various color input formats to an {r:0,g:0,b:0} object. - * - * @param {string} color The string representation of a color - * @example - * colorToRgb('#000'); - * @example - * colorToRgb('#000000'); - * @example - * colorToRgb('rgb(0,0,0)'); - * @example - * colorToRgb('rgba(0,0,0)'); - * - * @return {{r: number, g: number, b: number, [a]: number}|null} - */ - function colorToRgb( color ) { - - var hex3 = color.match( /^#([0-9a-f]{3})$/i ); - if( hex3 && hex3[1] ) { - hex3 = hex3[1]; - return { - r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11, - g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11, - b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11 - }; - } - - var hex6 = color.match( /^#([0-9a-f]{6})$/i ); - if( hex6 && hex6[1] ) { - hex6 = hex6[1]; - return { - r: parseInt( hex6.substr( 0, 2 ), 16 ), - g: parseInt( hex6.substr( 2, 2 ), 16 ), - b: parseInt( hex6.substr( 4, 2 ), 16 ) - }; - } - - var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i ); - if( rgb ) { - return { - r: parseInt( rgb[1], 10 ), - g: parseInt( rgb[2], 10 ), - b: parseInt( rgb[3], 10 ) - }; - } - - var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i ); - if( rgba ) { - return { - r: parseInt( rgba[1], 10 ), - g: parseInt( rgba[2], 10 ), - b: parseInt( rgba[3], 10 ), - a: parseFloat( rgba[4] ) - }; - } - - return null; - - } - - /** - * Calculates brightness on a scale of 0-255. - * - * @param {string} color See colorToRgb for supported formats. - * @see {@link colorToRgb} - */ - function colorBrightness( color ) { - - if( typeof color === 'string' ) color = colorToRgb( color ); - - if( color ) { - return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000; - } - - return null; - - } - - /** - * Returns the remaining height within the parent of the - * target element. - * - * remaining height = [ configured parent height ] - [ current parent height ] - * - * @param {HTMLElement} element - * @param {number} [height] - */ - function getRemainingHeight( element, height ) { - - height = height || 0; - - if( element ) { - var newHeight, oldHeight = element.style.height; - - // Change the .stretch element height to 0 in order find the height of all - // the other elements - element.style.height = '0px'; - newHeight = height - element.parentNode.offsetHeight; - - // Restore the old height, just in case - element.style.height = oldHeight + 'px'; - - return newHeight; - } - - return height; - - } - - /** - * Checks if this instance is being used to print a PDF. - */ - function isPrintingPDF() { - - return ( /print-pdf/gi ).test( window.location.search ); - - } - - /** - * Check if this instance is being used to print a PDF with fragments. - */ - function isPrintingPDFFragments() { - - return ( /print-pdf-fragments/gi ).test( window.location.search ); - - } - - /** - * Hides the address bar if we're on a mobile device. - */ - function hideAddressBar() { - - if( config.hideAddressBar && isMobileDevice ) { - // Events that should trigger the address bar to hide - window.addEventListener( 'load', removeAddressBar, false ); - window.addEventListener( 'orientationchange', removeAddressBar, false ); - } - - } + // Flags if we should use zoom instead of transform to scale + // up slides. Zoom produces crisper results but has a lot of + // xbrowser quirks so we only use it in whitelsited browsers. + features.zoom = 'zoom' in testElement.style && !isMobileDevice && + (isChrome || /Version\/[\d\.]+.*Safari/.test(UA)); - /** - * Causes the address bar to hide on mobile devices, - * more vertical space ftw. - */ - function removeAddressBar() { + } - setTimeout( function() { - window.scrollTo( 0, 1 ); - }, 10 ); + /** + * Loads the dependencies of reveal.js. Dependencies are + * defined via the configuration option 'dependencies' + * and will be loaded prior to starting/binding reveal.js. + * Some dependencies may have an 'async' flag, if so they + * will load after reveal.js has been started up. + */ + function load() { + + var scripts = [], + scriptsAsync = [], + scriptsToPreload = 0; + + // Called once synchronous scripts finish loading + function proceed() { + if (scriptsAsync.length) { + // Load asynchronous scripts + head.js.apply(null, scriptsAsync); + } + + start(); + } + + function loadScript(s) { + head.ready(s.src.match(/([\w\d_\-]*)\.?js(\?[\w\d.=&]*)?$|[^\\\/]*$/i)[0], function () { + // Extension may contain callback functions + if (typeof s.callback === 'function') { + s.callback.apply(this); + } + + if (--scriptsToPreload === 0) { + proceed(); + } + }); + } + + for (var i = 0, len = config.dependencies.length; i < len; i++) { + var s = config.dependencies[i]; + + // Load if there's no condition or the condition is truthy + if (!s.condition || s.condition()) { + if (s.async) { + scriptsAsync.push(s.src); + } else { + scripts.push(s.src); + } + + loadScript(s); + } + } + + if (scripts.length) { + scriptsToPreload = scripts.length; + + // Load synchronous scripts + head.js.apply(null, scripts); + } else { + proceed(); + } + + } + + /** + * Starts up reveal.js by binding input events and navigating + * to the current URL deeplink if there is one. + */ + function start() { + + loaded = true; + + // Make sure we've got all the DOM elements we need + setupDOM(); + + // Listen to messages posted to this window + setupPostMessage(); + + // Prevent the slides from being scrolled out of view + setupScrollPrevention(); + + // Resets all vertical slides so that only the first is visible + resetVerticalSlides(); + + // Updates the presentation to match the current configuration values + configure(); + + // Read the initial hash + readURL(); + + // Update all backgrounds + updateBackground(true); + + // Notify listeners that the presentation is ready but use a 1ms + // timeout to ensure it's not fired synchronously after #initialize() + setTimeout(function () { + // Enable transitions now that we're loaded + dom.slides.classList.remove('no-transition'); + + dom.wrapper.classList.add('ready'); + + dispatchEvent('ready', { + 'indexh': indexh, + 'indexv': indexv, + 'currentSlide': currentSlide + }); + }, 1); + + // Special setup and config is required when printing to PDF + if (isPrintingPDF()) { + removeEventListeners(); + + // The document needs to have loaded for the PDF layout + // measurements to be accurate + if (document.readyState === 'complete') { + setupPDF(); + } else { + window.addEventListener('load', setupPDF); + } + } + + } + + /** + * Finds and stores references to DOM elements which are + * required by the presentation. If a required element is + * not found, it is created. + */ + function setupDOM() { + + // Prevent transitions while we're loading + dom.slides.classList.add('no-transition'); + + if (isMobileDevice) { + dom.wrapper.classList.add('no-hover'); + } else { + dom.wrapper.classList.remove('no-hover'); + } + + if (/iphone/gi.test(UA)) { + dom.wrapper.classList.add('ua-iphone'); + } else { + dom.wrapper.classList.remove('ua-iphone'); + } + + // Background element + dom.background = createSingletonNode(dom.wrapper, 'div', 'backgrounds', null); + + // Progress bar + dom.progress = createSingletonNode(dom.wrapper, 'div', 'progress', ''); + dom.progressbar = dom.progress.querySelector('span'); + + // Arrow controls + dom.controls = createSingletonNode(dom.wrapper, 'aside', 'controls', + '' + + '' + + '' + + ''); + + // Slide number + dom.slideNumber = createSingletonNode(dom.wrapper, 'div', 'slide-number', ''); + + // Element containing notes that are visible to the audience + dom.speakerNotes = createSingletonNode(dom.wrapper, 'div', 'speaker-notes', null); + dom.speakerNotes.setAttribute('data-prevent-swipe', ''); + dom.speakerNotes.setAttribute('tabindex', '0'); + + // Overlay graphic which is displayed during the paused mode + dom.pauseOverlay = createSingletonNode(dom.wrapper, 'div', 'pause-overlay', ''); + dom.resumeButton = dom.pauseOverlay.querySelector('.resume-button'); + + dom.wrapper.setAttribute('role', 'application'); + + // There can be multiple instances of controls throughout the page + dom.controlsLeft = toArray(document.querySelectorAll('.navigate-left')); + dom.controlsRight = toArray(document.querySelectorAll('.navigate-right')); + dom.controlsUp = toArray(document.querySelectorAll('.navigate-up')); + dom.controlsDown = toArray(document.querySelectorAll('.navigate-down')); + dom.controlsPrev = toArray(document.querySelectorAll('.navigate-prev')); + dom.controlsNext = toArray(document.querySelectorAll('.navigate-next')); + + // The right and down arrows in the standard reveal.js controls + dom.controlsRightArrow = dom.controls.querySelector('.navigate-right'); + dom.controlsDownArrow = dom.controls.querySelector('.navigate-down'); + + dom.statusDiv = createStatusDiv(); + } + + /** + * Creates a hidden div with role aria-live to announce the + * current slide content. Hide the div off-screen to make it + * available only to Assistive Technologies. + * + * @return {HTMLElement} + */ + function createStatusDiv() { + + var statusDiv = document.getElementById('aria-status-div'); + if (!statusDiv) { + statusDiv = document.createElement('div'); + statusDiv.style.position = 'absolute'; + statusDiv.style.height = '1px'; + statusDiv.style.width = '1px'; + statusDiv.style.overflow = 'hidden'; + statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )'; + statusDiv.setAttribute('id', 'aria-status-div'); + statusDiv.setAttribute('aria-live', 'polite'); + statusDiv.setAttribute('aria-atomic', 'true'); + dom.wrapper.appendChild(statusDiv); + } + return statusDiv; + + } + + /** + * Converts the given HTML element into a string of text + * that can be announced to a screen reader. Hidden + * elements are excluded. + */ + function getStatusText(node) { + + var text = ''; + + // Text node + if (node.nodeType === 3) { + text += node.textContent; + } + // Element node + else if (node.nodeType === 1) { + + var isAriaHidden = node.getAttribute('aria-hidden'); + var isDisplayHidden = window.getComputedStyle(node)['display'] === 'none'; + if (isAriaHidden !== 'true' && !isDisplayHidden) { + + toArray(node.childNodes).forEach(function (child) { + text += getStatusText(child); + }); + + } + + } + + return text; + + } + + /** + * Configures the presentation for printing to a static + * PDF. + */ + function setupPDF() { + + var slideSize = getComputedSlideSize(window.innerWidth, window.innerHeight); + + // Dimensions of the PDF pages + var pageWidth = Math.floor(slideSize.width * (1 + config.margin)), + pageHeight = Math.floor(slideSize.height * (1 + config.margin)); + + // Dimensions of slides within the pages + var slideWidth = slideSize.width, + slideHeight = slideSize.height; + + // Let the browser know what page size we want to print + injectStyleSheet('@page{size:' + pageWidth + 'px ' + pageHeight + 'px; margin: 0px;}'); + + // Limit the size of certain elements to the dimensions of the slide + injectStyleSheet('.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: ' + slideWidth + 'px; max-height:' + slideHeight + 'px}'); + + document.body.classList.add('print-pdf'); + document.body.style.width = pageWidth + 'px'; + document.body.style.height = pageHeight + 'px'; + + // Make sure stretch elements fit on slide + layoutSlideContents(slideWidth, slideHeight); + + // Add each slide's index as attributes on itself, we need these + // indices to generate slide numbers below + toArray(dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR)).forEach(function (hslide, h) { + hslide.setAttribute('data-index-h', h); + + if (hslide.classList.contains('stack')) { + toArray(hslide.querySelectorAll('section')).forEach(function (vslide, v) { + vslide.setAttribute('data-index-h', h); + vslide.setAttribute('data-index-v', v); + }); + } + }); + + // Slide and slide background layout + toArray(dom.wrapper.querySelectorAll(SLIDES_SELECTOR)).forEach(function (slide) { + + // Vertical stacks are not centred since their section + // children will be + if (slide.classList.contains('stack') === false) { + // Center the slide inside of the page, giving the slide some margin + var left = (pageWidth - slideWidth) / 2, + top = (pageHeight - slideHeight) / 2; + + var contentHeight = slide.scrollHeight; + var numberOfPages = Math.max(Math.ceil(contentHeight / pageHeight), 1); + + // Adhere to configured pages per slide limit + numberOfPages = Math.min(numberOfPages, config.pdfMaxPagesPerSlide); + + // Center slides vertically + if (numberOfPages === 1 && config.center || slide.classList.contains('center')) { + top = Math.max((pageHeight - contentHeight) / 2, 0); + } + + // Wrap the slide in a page element and hide its overflow + // so that no page ever flows onto another + var page = document.createElement('div'); + page.className = 'pdf-page'; + page.style.height = ((pageHeight + config.pdfPageHeightOffset) * numberOfPages) + 'px'; + slide.parentNode.insertBefore(page, slide); + page.appendChild(slide); + + // Position the slide inside of the page + slide.style.left = left + 'px'; + slide.style.top = top + 'px'; + slide.style.width = slideWidth + 'px'; + + if (slide.slideBackgroundElement) { + page.insertBefore(slide.slideBackgroundElement, slide); + } + + // Inject notes if `showNotes` is enabled + if (config.showNotes) { + + // Are there notes for this slide? + var notes = getSlideNotes(slide); + if (notes) { + + var notesSpacing = 8; + var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline'; + var notesElement = document.createElement('div'); + notesElement.classList.add('speaker-notes'); + notesElement.classList.add('speaker-notes-pdf'); + notesElement.setAttribute('data-layout', notesLayout); + notesElement.innerHTML = notes; + + if (notesLayout === 'separate-page') { + page.parentNode.insertBefore(notesElement, page.nextSibling); + } else { + notesElement.style.left = notesSpacing + 'px'; + notesElement.style.bottom = notesSpacing + 'px'; + notesElement.style.width = (pageWidth - notesSpacing * 2) + 'px'; + page.appendChild(notesElement); + } + + } + + } + + // Inject slide numbers if `slideNumbers` are enabled + if (config.slideNumber && /all|print/i.test(config.showSlideNumber)) { + var slideNumberH = parseInt(slide.getAttribute('data-index-h'), 10) + 1, + slideNumberV = parseInt(slide.getAttribute('data-index-v'), 10) + 1; + + var numberElement = document.createElement('div'); + numberElement.classList.add('slide-number'); + numberElement.classList.add('slide-number-pdf'); + numberElement.innerHTML = formatSlideNumber(slideNumberH, '.', slideNumberV); + page.appendChild(numberElement); + } + + // Copy page and show fragments one after another + if (config.pdfSeparateFragments) { + + // Each fragment 'group' is an array containing one or more + // fragments. Multiple fragments that appear at the same time + // are part of the same group. + var fragmentGroups = sortFragments(page.querySelectorAll('.fragment'), true); + + var previousFragmentStep; + var previousPage; + + fragmentGroups.forEach(function (fragments) { + + // Remove 'current-fragment' from the previous group + if (previousFragmentStep) { + previousFragmentStep.forEach(function (fragment) { + fragment.classList.remove('current-fragment'); + }); + } + + // Show the fragments for the current index + fragments.forEach(function (fragment) { + fragment.classList.add('visible', 'current-fragment'); + }); + + // Create a separate page for the current fragment state + var clonedPage = page.cloneNode(true); + page.parentNode.insertBefore(clonedPage, (previousPage || page).nextSibling); + + previousFragmentStep = fragments; + previousPage = clonedPage; + + }); + + // Reset the first/original page so that all fragments are hidden + fragmentGroups.forEach(function (fragments) { + fragments.forEach(function (fragment) { + fragment.classList.remove('visible', 'current-fragment'); + }); + }); + + } + // Show all fragments + else { + toArray(page.querySelectorAll('.fragment:not(.fade-out)')).forEach(function (fragment) { + fragment.classList.add('visible'); + }); + } + + } + + }); + + // Notify subscribers that the PDF layout is good to go + dispatchEvent('pdf-ready'); + + } + + /** + * This is an unfortunate necessity. Some actions – such as + * an input field being focused in an iframe or using the + * keyboard to expand text selection beyond the bounds of + * a slide – can trigger our content to be pushed out of view. + * This scrolling can not be prevented by hiding overflow in + * CSS (we already do) so we have to resort to repeatedly + * checking if the slides have been offset :( + */ + function setupScrollPrevention() { + + setInterval(function () { + if (dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0) { + dom.wrapper.scrollTop = 0; + dom.wrapper.scrollLeft = 0; + } + }, 1000); + + } + + /** + * Creates an HTML element and returns a reference to it. + * If the element already exists the existing instance will + * be returned. + * + * @param {HTMLElement} container + * @param {string} tagname + * @param {string} classname + * @param {string} innerHTML + * + * @return {HTMLElement} + */ + function createSingletonNode(container, tagname, classname, innerHTML) { + + // Find all nodes matching the description + var nodes = container.querySelectorAll('.' + classname); + + // Check all matches to find one which is a direct child of + // the specified container + for (var i = 0; i < nodes.length; i++) { + var testNode = nodes[i]; + if (testNode.parentNode === container) { + return testNode; + } + } + + // If no node was found, create it now + var node = document.createElement(tagname); + node.className = classname; + if (typeof innerHTML === 'string') { + node.innerHTML = innerHTML; + } + container.appendChild(node); + + return node; + + } + + /** + * Creates the slide background elements and appends them + * to the background container. One element is created per + * slide no matter if the given slide has visible background. + */ + function createBackgrounds() { + + var printMode = isPrintingPDF(); + + // Clear prior backgrounds + dom.background.innerHTML = ''; + dom.background.classList.add('no-transition'); + + // Iterate over all horizontal slides + toArray(dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR)).forEach(function (slideh) { + + var backgroundStack = createBackground(slideh, dom.background); + + // Iterate over all vertical slides + toArray(slideh.querySelectorAll('section')).forEach(function (slidev) { + + createBackground(slidev, backgroundStack); + + backgroundStack.classList.add('stack'); + + }); + + }); + + // Add parallax background if specified + if (config.parallaxBackgroundImage) { + + dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")'; + dom.background.style.backgroundSize = config.parallaxBackgroundSize; + dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat; + dom.background.style.backgroundPosition = config.parallaxBackgroundPosition; + + // Make sure the below properties are set on the element - these properties are + // needed for proper transitions to be set on the element via CSS. To remove + // annoying background slide-in effect when the presentation starts, apply + // these properties after short time delay + setTimeout(function () { + dom.wrapper.classList.add('has-parallax-background'); + }, 1); + + } else { + + dom.background.style.backgroundImage = ''; + dom.wrapper.classList.remove('has-parallax-background'); + + } + + } + + /** + * Creates a background for the given slide. + * + * @param {HTMLElement} slide + * @param {HTMLElement} container The element that the background + * should be appended to + * @return {HTMLElement} New background div + */ + function createBackground(slide, container) { + + + // Main slide background element + var element = document.createElement('div'); + element.className = 'slide-background ' + slide.className.replace(/present|past|future/, ''); + + // Inner background element that wraps images/videos/iframes + var contentElement = document.createElement('div'); + contentElement.className = 'slide-background-content'; + + element.appendChild(contentElement); + container.appendChild(element); + + slide.slideBackgroundElement = element; + slide.slideBackgroundContentElement = contentElement; + + // Syncs the background to reflect all current background settings + syncBackground(slide); + + return element; + + } + + /** + * Renders all of the visual properties of a slide background + * based on the various background attributes. + * + * @param {HTMLElement} slide + */ + function syncBackground(slide) { + + var element = slide.slideBackgroundElement, + contentElement = slide.slideBackgroundContentElement; + + // Reset the prior background state in case this is not the + // initial sync + slide.classList.remove('has-dark-background'); + slide.classList.remove('has-light-background'); + + element.removeAttribute('data-loaded'); + element.removeAttribute('data-background-hash'); + element.removeAttribute('data-background-size'); + element.removeAttribute('data-background-transition'); + element.style.backgroundColor = ''; + + contentElement.style.backgroundSize = ''; + contentElement.style.backgroundRepeat = ''; + contentElement.style.backgroundPosition = ''; + contentElement.style.backgroundImage = ''; + contentElement.style.opacity = ''; + contentElement.innerHTML = ''; + + var data = { + background: slide.getAttribute('data-background'), + backgroundSize: slide.getAttribute('data-background-size'), + backgroundImage: slide.getAttribute('data-background-image'), + backgroundVideo: slide.getAttribute('data-background-video'), + backgroundIframe: slide.getAttribute('data-background-iframe'), + backgroundColor: slide.getAttribute('data-background-color'), + backgroundRepeat: slide.getAttribute('data-background-repeat'), + backgroundPosition: slide.getAttribute('data-background-position'), + backgroundTransition: slide.getAttribute('data-background-transition'), + backgroundOpacity: slide.getAttribute('data-background-opacity') + }; + + if (data.background) { + // Auto-wrap image urls in url(...) + if (/^(http|file|\/\/)/gi.test(data.background) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test(data.background)) { + slide.setAttribute('data-background-image', data.background); + } else { + element.style.background = data.background; + } + } + + // Create a hash for this combination of background settings. + // This is used to determine when two slide backgrounds are + // the same. + if (data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe) { + element.setAttribute('data-background-hash', data.background + + data.backgroundSize + + data.backgroundImage + + data.backgroundVideo + + data.backgroundIframe + + data.backgroundColor + + data.backgroundRepeat + + data.backgroundPosition + + data.backgroundTransition + + data.backgroundOpacity); + } + + // Additional and optional background properties + if (data.backgroundSize) element.setAttribute('data-background-size', data.backgroundSize); + if (data.backgroundColor) element.style.backgroundColor = data.backgroundColor; + if (data.backgroundTransition) element.setAttribute('data-background-transition', data.backgroundTransition); + + // Background image options are set on the content wrapper + if (data.backgroundSize) contentElement.style.backgroundSize = data.backgroundSize; + if (data.backgroundRepeat) contentElement.style.backgroundRepeat = data.backgroundRepeat; + if (data.backgroundPosition) contentElement.style.backgroundPosition = data.backgroundPosition; + if (data.backgroundOpacity) contentElement.style.opacity = data.backgroundOpacity; + + // If this slide has a background color, add a class that + // signals if it is light or dark. If the slide has no background + // color, no class will be set + var computedBackgroundStyle = window.getComputedStyle(element); + if (computedBackgroundStyle && computedBackgroundStyle.backgroundColor) { + var rgb = colorToRgb(computedBackgroundStyle.backgroundColor); + + // Ignore fully transparent backgrounds. Some browsers return + // rgba(0,0,0,0) when reading the computed background color of + // an element with no background + if (rgb && rgb.a !== 0) { + if (colorBrightness(computedBackgroundStyle.backgroundColor) < 128) { + slide.classList.add('has-dark-background'); + } else { + slide.classList.add('has-light-background'); + } + } + } + + } + + /** + * Registers a listener to postMessage events, this makes it + * possible to call all reveal.js API methods from another + * window. For example: + * + * revealWindow.postMessage( JSON.stringify({ + * method: 'slide', + * args: [ 2 ] + * }), '*' ); + */ + function setupPostMessage() { + + if (config.postMessage) { + window.addEventListener('message', function (event) { + var data = event.data; + + // Make sure we're dealing with JSON + if (typeof data === 'string' && data.charAt(0) === '{' && data.charAt(data.length - 1) === '}') { + data = JSON.parse(data); + + // Check if the requested method can be found + if (data.method && typeof Reveal[data.method] === 'function') { + Reveal[data.method].apply(Reveal, data.args); + } + } + }, false); + } + + } + + /** + * Applies the configuration settings from the config + * object. May be called multiple times. + * + * @param {object} options + */ + function configure(options) { + + var oldTransition = config.transition; + + // New config options may be passed when this method + // is invoked through the API after initialization + if (typeof options === 'object') extend(config, options); + + // Abort if reveal.js hasn't finished loading, config + // changes will be applied automatically once loading + // finishes + if (loaded === false) return; + + var numberOfSlides = dom.wrapper.querySelectorAll(SLIDES_SELECTOR).length; + + // Remove the previously configured transition class + dom.wrapper.classList.remove(oldTransition); + + // Force linear transition based on browser capabilities + if (features.transforms3d === false) config.transition = 'linear'; + + dom.wrapper.classList.add(config.transition); + + dom.wrapper.setAttribute('data-transition-speed', config.transitionSpeed); + dom.wrapper.setAttribute('data-background-transition', config.backgroundTransition); + + dom.controls.style.display = config.controls ? 'block' : 'none'; + dom.progress.style.display = config.progress ? 'block' : 'none'; + + dom.controls.setAttribute('data-controls-layout', config.controlsLayout); + dom.controls.setAttribute('data-controls-back-arrows', config.controlsBackArrows); + + if (config.shuffle) { + shuffle(); + } + + if (config.rtl) { + dom.wrapper.classList.add('rtl'); + } else { + dom.wrapper.classList.remove('rtl'); + } + + if (config.center) { + dom.wrapper.classList.add('center'); + } else { + dom.wrapper.classList.remove('center'); + } + + // Exit the paused mode if it was configured off + if (config.pause === false) { + resume(); + } + + if (config.showNotes) { + dom.speakerNotes.setAttribute('data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline'); + } + + if (config.mouseWheel) { + document.addEventListener('DOMMouseScroll', onDocumentMouseScroll, false); // FF + document.addEventListener('mousewheel', onDocumentMouseScroll, false); + } else { + document.removeEventListener('DOMMouseScroll', onDocumentMouseScroll, false); // FF + document.removeEventListener('mousewheel', onDocumentMouseScroll, false); + } + + // Rolling 3D links + if (config.rollingLinks) { + enableRollingLinks(); + } else { + disableRollingLinks(); + } + + // Iframe link previews + if (config.previewLinks) { + enablePreviewLinks(); + disablePreviewLinks('[data-preview-link=false]'); + } else { + disablePreviewLinks(); + enablePreviewLinks('[data-preview-link]:not([data-preview-link=false])'); + } + + // Remove existing auto-slide controls + if (autoSlidePlayer) { + autoSlidePlayer.destroy(); + autoSlidePlayer = null; + } + + // Generate auto-slide controls if needed + if (numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame) { + autoSlidePlayer = new Playback(dom.wrapper, function () { + return Math.min(Math.max((Date.now() - autoSlideStartTime) / autoSlide, 0), 1); + }); + + autoSlidePlayer.on('click', onAutoSlidePlayerClick); + autoSlidePaused = false; + } + + // When fragments are turned off they should be visible + if (config.fragments === false) { + toArray(dom.slides.querySelectorAll('.fragment')).forEach(function (element) { + element.classList.add('visible'); + element.classList.remove('current-fragment'); + }); + } + + // Slide numbers + var slideNumberDisplay = 'none'; + if (config.slideNumber && !isPrintingPDF()) { + if (config.showSlideNumber === 'all') { + slideNumberDisplay = 'block'; + } else if (config.showSlideNumber === 'speaker' && isSpeakerNotes()) { + slideNumberDisplay = 'block'; + } + } + + dom.slideNumber.style.display = slideNumberDisplay; + + sync(); + + } + + /** + * Binds all event listeners. + */ + function addEventListeners() { + + eventsAreBound = true; + + window.addEventListener('hashchange', onWindowHashChange, false); + window.addEventListener('resize', onWindowResize, false); + + if (config.touch) { + if ('onpointerdown' in window) { + // Use W3C pointer events + dom.wrapper.addEventListener('pointerdown', onPointerDown, false); + dom.wrapper.addEventListener('pointermove', onPointerMove, false); + dom.wrapper.addEventListener('pointerup', onPointerUp, false); + } else if (window.navigator.msPointerEnabled) { + // IE 10 uses prefixed version of pointer events + dom.wrapper.addEventListener('MSPointerDown', onPointerDown, false); + dom.wrapper.addEventListener('MSPointerMove', onPointerMove, false); + dom.wrapper.addEventListener('MSPointerUp', onPointerUp, false); + } else { + // Fall back to touch events + dom.wrapper.addEventListener('touchstart', onTouchStart, false); + dom.wrapper.addEventListener('touchmove', onTouchMove, false); + dom.wrapper.addEventListener('touchend', onTouchEnd, false); + } + } + + if (config.keyboard) { + document.addEventListener('keydown', onDocumentKeyDown, false); + document.addEventListener('keypress', onDocumentKeyPress, false); + } + + if (config.progress && dom.progress) { + dom.progress.addEventListener('click', onProgressClicked, false); + } + + dom.resumeButton.addEventListener('click', resume, false); + + if (config.focusBodyOnPageVisibilityChange) { + var visibilityChange; + + if ('hidden' in document) { + visibilityChange = 'visibilitychange'; + } else if ('msHidden' in document) { + visibilityChange = 'msvisibilitychange'; + } else if ('webkitHidden' in document) { + visibilityChange = 'webkitvisibilitychange'; + } + + if (visibilityChange) { + document.addEventListener(visibilityChange, onPageVisibilityChange, false); + } + } + + // Listen to both touch and click events, in case the device + // supports both + var pointerEvents = ['touchstart', 'click']; + + // Only support touch for Android, fixes double navigations in + // stock browser + if (UA.match(/android/gi)) { + pointerEvents = ['touchstart']; + } + + pointerEvents.forEach(function (eventName) { + dom.controlsLeft.forEach(function (el) { + el.addEventListener(eventName, onNavigateLeftClicked, false); + }); + dom.controlsRight.forEach(function (el) { + el.addEventListener(eventName, onNavigateRightClicked, false); + }); + dom.controlsUp.forEach(function (el) { + el.addEventListener(eventName, onNavigateUpClicked, false); + }); + dom.controlsDown.forEach(function (el) { + el.addEventListener(eventName, onNavigateDownClicked, false); + }); + dom.controlsPrev.forEach(function (el) { + el.addEventListener(eventName, onNavigatePrevClicked, false); + }); + dom.controlsNext.forEach(function (el) { + el.addEventListener(eventName, onNavigateNextClicked, false); + }); + }); + + } + + /** + * Unbinds all event listeners. + */ + function removeEventListeners() { + + eventsAreBound = false; + + document.removeEventListener('keydown', onDocumentKeyDown, false); + document.removeEventListener('keypress', onDocumentKeyPress, false); + window.removeEventListener('hashchange', onWindowHashChange, false); + window.removeEventListener('resize', onWindowResize, false); + + dom.wrapper.removeEventListener('pointerdown', onPointerDown, false); + dom.wrapper.removeEventListener('pointermove', onPointerMove, false); + dom.wrapper.removeEventListener('pointerup', onPointerUp, false); + + dom.wrapper.removeEventListener('MSPointerDown', onPointerDown, false); + dom.wrapper.removeEventListener('MSPointerMove', onPointerMove, false); + dom.wrapper.removeEventListener('MSPointerUp', onPointerUp, false); + + dom.wrapper.removeEventListener('touchstart', onTouchStart, false); + dom.wrapper.removeEventListener('touchmove', onTouchMove, false); + dom.wrapper.removeEventListener('touchend', onTouchEnd, false); + + dom.resumeButton.removeEventListener('click', resume, false); + + if (config.progress && dom.progress) { + dom.progress.removeEventListener('click', onProgressClicked, false); + } + + ['touchstart', 'click'].forEach(function (eventName) { + dom.controlsLeft.forEach(function (el) { + el.removeEventListener(eventName, onNavigateLeftClicked, false); + }); + dom.controlsRight.forEach(function (el) { + el.removeEventListener(eventName, onNavigateRightClicked, false); + }); + dom.controlsUp.forEach(function (el) { + el.removeEventListener(eventName, onNavigateUpClicked, false); + }); + dom.controlsDown.forEach(function (el) { + el.removeEventListener(eventName, onNavigateDownClicked, false); + }); + dom.controlsPrev.forEach(function (el) { + el.removeEventListener(eventName, onNavigatePrevClicked, false); + }); + dom.controlsNext.forEach(function (el) { + el.removeEventListener(eventName, onNavigateNextClicked, false); + }); + }); + + } + + /** + * Add a custom key binding with optional description to + * be added to the help screen. + */ + function addKeyBinding(binding, callback) { + + if (typeof binding === 'object' && binding.keyCode) { + registeredKeyBindings[binding.keyCode] = { + callback: callback, + key: binding.key, + description: binding.description + }; + } else { + registeredKeyBindings[binding] = { + callback: callback, + key: null, + description: null + }; + } + + } + + /** + * Removes the specified custom key binding. + */ + function removeKeyBinding(keyCode) { + + delete registeredKeyBindings[keyCode]; + + } + + /** + * Extend object a with the properties of object b. + * If there's a conflict, object b takes precedence. + * + * @param {object} a + * @param {object} b + */ + function extend(a, b) { + + for (var i in b) { + a[i] = b[i]; + } + + return a; + + } + + /** + * Converts the target object to an array. + * + * @param {object} o + * @return {object[]} + */ + function toArray(o) { + + return Array.prototype.slice.call(o); + + } + + /** + * Utility for deserializing a value. + * + * @param {*} value + * @return {*} + */ + function deserialize(value) { + + if (typeof value === 'string') { + if (value === 'null') return null; + else if (value === 'true') return true; + else if (value === 'false') return false; + else if (value.match(/^-?[\d\.]+$/)) return parseFloat(value); + } + + return value; + + } + + /** + * Measures the distance in pixels between point a + * and point b. + * + * @param {object} a point with x/y properties + * @param {object} b point with x/y properties + * + * @return {number} + */ + function distanceBetween(a, b) { + + var dx = a.x - b.x, + dy = a.y - b.y; + + return Math.sqrt(dx * dx + dy * dy); + + } + + /** + * Applies a CSS transform to the target element. + * + * @param {HTMLElement} element + * @param {string} transform + */ + function transformElement(element, transform) { + + element.style.WebkitTransform = transform; + element.style.MozTransform = transform; + element.style.msTransform = transform; + element.style.transform = transform; + + } + + /** + * Applies CSS transforms to the slides container. The container + * is transformed from two separate sources: layout and the overview + * mode. + * + * @param {object} transforms + */ + function transformSlides(transforms) { + + // Pick up new transforms from arguments + if (typeof transforms.layout === 'string') slidesTransform.layout = transforms.layout; + if (typeof transforms.overview === 'string') slidesTransform.overview = transforms.overview; + + // Apply the transforms to the slides container + if (slidesTransform.layout) { + transformElement(dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview); + } else { + transformElement(dom.slides, slidesTransform.overview); + } + + } + + /** + * Injects the given CSS styles into the DOM. + * + * @param {string} value + */ + function injectStyleSheet(value) { + + var tag = document.createElement('style'); + tag.type = 'text/css'; + if (tag.styleSheet) { + tag.styleSheet.cssText = value; + } else { + tag.appendChild(document.createTextNode(value)); + } + document.getElementsByTagName('head')[0].appendChild(tag); + + } + + /** + * Find the closest parent that matches the given + * selector. + * + * @param {HTMLElement} target The child element + * @param {String} selector The CSS selector to match + * the parents against + * + * @return {HTMLElement} The matched parent or null + * if no matching parent was found + */ + function closestParent(target, selector) { + + var parent = target.parentNode; + + while (parent) { + + // There's some overhead doing this each time, we don't + // want to rewrite the element prototype but should still + // be enough to feature detect once at startup... + var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector; + + // If we find a match, we're all set + if (matchesMethod && matchesMethod.call(parent, selector)) { + return parent; + } + + // Keep searching + parent = parent.parentNode; + + } + + return null; + + } + + /** + * Converts various color input formats to an {r:0,g:0,b:0} object. + * + * @param {string} color The string representation of a color + * @example + * colorToRgb('#000'); + * @example + * colorToRgb('#000000'); + * @example + * colorToRgb('rgb(0,0,0)'); + * @example + * colorToRgb('rgba(0,0,0)'); + * + * @return {{r: number, g: number, b: number, [a]: number}|null} + */ + function colorToRgb(color) { + + var hex3 = color.match(/^#([0-9a-f]{3})$/i); + if (hex3 && hex3[1]) { + hex3 = hex3[1]; + return { + r: parseInt(hex3.charAt(0), 16) * 0x11, + g: parseInt(hex3.charAt(1), 16) * 0x11, + b: parseInt(hex3.charAt(2), 16) * 0x11 + }; + } + + var hex6 = color.match(/^#([0-9a-f]{6})$/i); + if (hex6 && hex6[1]) { + hex6 = hex6[1]; + return { + r: parseInt(hex6.substr(0, 2), 16), + g: parseInt(hex6.substr(2, 2), 16), + b: parseInt(hex6.substr(4, 2), 16) + }; + } + + var rgb = color.match(/^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i); + if (rgb) { + return { + r: parseInt(rgb[1], 10), + g: parseInt(rgb[2], 10), + b: parseInt(rgb[3], 10) + }; + } + + var rgba = color.match(/^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i); + if (rgba) { + return { + r: parseInt(rgba[1], 10), + g: parseInt(rgba[2], 10), + b: parseInt(rgba[3], 10), + a: parseFloat(rgba[4]) + }; + } + + return null; + + } + + /** + * Calculates brightness on a scale of 0-255. + * + * @param {string} color See colorToRgb for supported formats. + * @see {@link colorToRgb} + */ + function colorBrightness(color) { + + if (typeof color === 'string') color = colorToRgb(color); + + if (color) { + return (color.r * 299 + color.g * 587 + color.b * 114) / 1000; + } + + return null; + + } + + /** + * Returns the remaining height within the parent of the + * target element. + * + * remaining height = [ configured parent height ] - [ current parent height ] + * + * @param {HTMLElement} element + * @param {number} [height] + */ + function getRemainingHeight(element, height) { + + height = height || 0; + + if (element) { + var newHeight, oldHeight = element.style.height; + + // Change the .stretch element height to 0 in order find the height of all + // the other elements + element.style.height = '0px'; + newHeight = height - element.parentNode.offsetHeight; + + // Restore the old height, just in case + element.style.height = oldHeight + 'px'; + + return newHeight; + } + + return height; + + } + + /** + * Checks if this instance is being used to print a PDF. + */ + function isPrintingPDF() { + + return (/print-pdf/gi).test(window.location.search); + + } + + /** + * Check if this instance is being used to print a PDF with fragments. + */ + function isPrintingPDFFragments() { + + return (/print-pdf-fragments/gi).test(window.location.search); + + } + + /** + * Hides the address bar if we're on a mobile device. + */ + function hideAddressBar() { + + if (config.hideAddressBar && isMobileDevice) { + // Events that should trigger the address bar to hide + window.addEventListener('load', removeAddressBar, false); + window.addEventListener('orientationchange', removeAddressBar, false); + } + + } + + /** + * Causes the address bar to hide on mobile devices, + * more vertical space ftw. + */ + function removeAddressBar() { - } + setTimeout(function () { + window.scrollTo(0, 1); + }, 10); - /** - * Dispatches an event of the specified type from the - * reveal DOM element. - */ - function dispatchEvent( type, args ) { + } - var event = document.createEvent( 'HTMLEvents', 1, 2 ); - event.initEvent( type, true, true ); - extend( event, args ); - dom.wrapper.dispatchEvent( event ); + /** + * Dispatches an event of the specified type from the + * reveal DOM element. + */ + function dispatchEvent(type, args) { - // If we're in an iframe, post each reveal.js event to the - // parent window. Used by the notes plugin - if( config.postMessageEvents && window.parent !== window.self ) { - window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' ); - } + var event = document.createEvent('HTMLEvents', 1, 2); + event.initEvent(type, true, true); + extend(event, args); + dom.wrapper.dispatchEvent(event); - } - - /** - * Wrap all links in 3D goodness. - */ - function enableRollingLinks() { - - if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) { - var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' ); - - for( var i = 0, len = anchors.length; i < len; i++ ) { - var anchor = anchors[i]; - - if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) { - var span = document.createElement('span'); - span.setAttribute('data-title', anchor.text); - span.innerHTML = anchor.innerHTML; - - anchor.classList.add( 'roll' ); - anchor.innerHTML = ''; - anchor.appendChild(span); - } - } - } + // If we're in an iframe, post each reveal.js event to the + // parent window. Used by the notes plugin + if (config.postMessageEvents && window.parent !== window.self) { + window.parent.postMessage(JSON.stringify({ + namespace: 'reveal', + eventName: type, + state: getState() + }), '*'); + } + + } + + /** + * Wrap all links in 3D goodness. + */ + function enableRollingLinks() { + + if (features.transforms3d && !('msPerspective' in document.body.style)) { + var anchors = dom.wrapper.querySelectorAll(SLIDES_SELECTOR + ' a'); + + for (var i = 0, len = anchors.length; i < len; i++) { + var anchor = anchors[i]; + + if (anchor.textContent && !anchor.querySelector('*') && (!anchor.className || !anchor.classList.contains(anchor, 'roll'))) { + var span = document.createElement('span'); + span.setAttribute('data-title', anchor.text); + span.innerHTML = anchor.innerHTML; + + anchor.classList.add('roll'); + anchor.innerHTML = ''; + anchor.appendChild(span); + } + } + } + + } + + /** + * Unwrap all 3D links. + */ + function disableRollingLinks() { + + var anchors = dom.wrapper.querySelectorAll(SLIDES_SELECTOR + ' a.roll'); + + for (var i = 0, len = anchors.length; i < len; i++) { + var anchor = anchors[i]; + var span = anchor.querySelector('span'); + + if (span) { + anchor.classList.remove('roll'); + anchor.innerHTML = span.innerHTML; + } + } + + } + + /** + * Bind preview frame links. + * + * @param {string} [selector=a] - selector for anchors + */ + function enablePreviewLinks(selector) { + + var anchors = toArray(document.querySelectorAll(selector ? selector : 'a')); + + anchors.forEach(function (element) { + if (/^(http|www)/gi.test(element.getAttribute('href'))) { + element.addEventListener('click', onPreviewLinkClicked, false); + } + }); + + } + + /** + * Unbind preview frame links. + */ + function disablePreviewLinks(selector) { + + var anchors = toArray(document.querySelectorAll(selector ? selector : 'a')); + + anchors.forEach(function (element) { + if (/^(http|www)/gi.test(element.getAttribute('href'))) { + element.removeEventListener('click', onPreviewLinkClicked, false); + } + }); + + } + + /** + * Opens a preview window for the target URL. + * + * @param {string} url - url for preview iframe src + */ + function showPreview(url) { + + closeOverlay(); + + dom.overlay = document.createElement('div'); + dom.overlay.classList.add('overlay'); + dom.overlay.classList.add('overlay-preview'); + dom.wrapper.appendChild(dom.overlay); + + dom.overlay.innerHTML = [ + '
', + '', + '', + '
', + '', + '
', + '', + '', + 'Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).', + '', + '
' + ].join(''); + + dom.overlay.querySelector('iframe').addEventListener('load', function (event) { + dom.overlay.classList.add('loaded'); + }, false); + + dom.overlay.querySelector('.close').addEventListener('click', function (event) { + closeOverlay(); + event.preventDefault(); + }, false); + + dom.overlay.querySelector('.external').addEventListener('click', function (event) { + closeOverlay(); + }, false); + + setTimeout(function () { + dom.overlay.classList.add('visible'); + }, 1); + + } + + /** + * Open or close help overlay window. + * + * @param {Boolean} [override] Flag which overrides the + * toggle logic and forcibly sets the desired state. True means + * help is open, false means it's closed. + */ + function toggleHelp(override) { + + if (typeof override === 'boolean') { + override ? showHelp() : closeOverlay(); + } else { + if (dom.overlay) { + closeOverlay(); + } else { + showHelp(); + } + } + } + + /** + * Opens an overlay window with help material. + */ + function showHelp() { + + if (config.help) { + + closeOverlay(); + + dom.overlay = document.createElement('div'); + dom.overlay.classList.add('overlay'); + dom.overlay.classList.add('overlay-help'); + dom.wrapper.appendChild(dom.overlay); + + var html = '

Keyboard Shortcuts


'; + + html += ''; + for (var key in keyboardShortcuts) { + html += ''; + } + + // Add custom key bindings that have associated descriptions + for (var binding in registeredKeyBindings) { + if (registeredKeyBindings[binding].key && registeredKeyBindings[binding].description) { + html += ''; + } + } + + html += '
KEYACTION
' + key + '' + keyboardShortcuts[key] + '
' + registeredKeyBindings[binding].key + '' + registeredKeyBindings[binding].description + '
'; + + dom.overlay.innerHTML = [ + '
', + '', + '
', + '
', + '
' + html + '
', + '
' + ].join(''); + + dom.overlay.querySelector('.close').addEventListener('click', function (event) { + closeOverlay(); + event.preventDefault(); + }, false); + + setTimeout(function () { + dom.overlay.classList.add('visible'); + }, 1); + + } + + } + + /** + * Closes any currently open overlay. + */ + function closeOverlay() { + + if (dom.overlay) { + dom.overlay.parentNode.removeChild(dom.overlay); + dom.overlay = null; + } + + } + + /** + * Applies JavaScript-controlled layout rules to the + * presentation. + */ + function layout() { + + if (dom.wrapper && !isPrintingPDF()) { + + if (!config.disableLayout) { + + var size = getComputedSlideSize(); + + // Layout the contents of the slides + layoutSlideContents(config.width, config.height); + + dom.slides.style.width = size.width + 'px'; + dom.slides.style.height = size.height + 'px'; + + // Determine scale of content to fit within available space + scale = Math.min(size.presentationWidth / size.width, size.presentationHeight / size.height); + + // Respect max/min scale settings + scale = Math.max(scale, config.minScale); + scale = Math.min(scale, config.maxScale); + + // Don't apply any scaling styles if scale is 1 + if (scale === 1) { + dom.slides.style.zoom = ''; + dom.slides.style.left = ''; + dom.slides.style.top = ''; + dom.slides.style.bottom = ''; + dom.slides.style.right = ''; + transformSlides({layout: ''}); + } else { + // Prefer zoom for scaling up so that content remains crisp. + // Don't use zoom to scale down since that can lead to shifts + // in text layout/line breaks. + if (scale > 1 && features.zoom) { + dom.slides.style.zoom = scale; + dom.slides.style.left = ''; + dom.slides.style.top = ''; + dom.slides.style.bottom = ''; + dom.slides.style.right = ''; + transformSlides({layout: ''}); + } + // Apply scale transform as a fallback + else { + dom.slides.style.zoom = ''; + dom.slides.style.left = '50%'; + dom.slides.style.top = '50%'; + dom.slides.style.bottom = 'auto'; + dom.slides.style.right = 'auto'; + transformSlides({layout: 'translate(-50%, -50%) scale(' + scale + ')'}); + } + } + + // Select all slides, vertical and horizontal + var slides = toArray(dom.wrapper.querySelectorAll(SLIDES_SELECTOR)); + + for (var i = 0, len = slides.length; i < len; i++) { + var slide = slides[i]; + + // Don't bother updating invisible slides + if (slide.style.display === 'none') { + continue; + } + + if (config.center || slide.classList.contains('center')) { + // Vertical stacks are not centred since their section + // children will be + if (slide.classList.contains('stack')) { + slide.style.top = 0; + } else { + slide.style.top = Math.max((size.height - slide.scrollHeight) / 2, 0) + 'px'; + } + } else { + slide.style.top = ''; + } + + } + + } + + updateProgress(); + updateParallax(); + + if (isOverview()) { + updateOverview(); + } + + } + + } + + /** + * Applies layout logic to the contents of all slides in + * the presentation. + * + * @param {string|number} width + * @param {string|number} height + */ + function layoutSlideContents(width, height) { + + // Handle sizing of elements with the 'stretch' class + toArray(dom.slides.querySelectorAll('section > .stretch')).forEach(function (element) { + + // Determine how much vertical space we can use + var remainingHeight = getRemainingHeight(element, height); + + // Consider the aspect ratio of media elements + if (/(img|video)/gi.test(element.nodeName)) { + var nw = element.naturalWidth || element.videoWidth, + nh = element.naturalHeight || element.videoHeight; + + var es = Math.min(width / nw, remainingHeight / nh); + + element.style.width = (nw * es) + 'px'; + element.style.height = (nh * es) + 'px'; + + } else { + element.style.width = width + 'px'; + element.style.height = remainingHeight + 'px'; + } + + }); + + } + + /** + * Calculates the computed pixel size of our slides. These + * values are based on the width and height configuration + * options. + * + * @param {number} [presentationWidth=dom.wrapper.offsetWidth] + * @param {number} [presentationHeight=dom.wrapper.offsetHeight] + */ + function getComputedSlideSize(presentationWidth, presentationHeight) { + + var size = { + // Slide size + width: config.width, + height: config.height, + + // Presentation size + presentationWidth: presentationWidth || dom.wrapper.offsetWidth, + presentationHeight: presentationHeight || dom.wrapper.offsetHeight + }; + + // Reduce available space by margin + size.presentationWidth -= (size.presentationWidth * config.margin); + size.presentationHeight -= (size.presentationHeight * config.margin); + + // Slide width may be a percentage of available width + if (typeof size.width === 'string' && /%$/.test(size.width)) { + size.width = parseInt(size.width, 10) / 100 * size.presentationWidth; + } + + // Slide height may be a percentage of available height + if (typeof size.height === 'string' && /%$/.test(size.height)) { + size.height = parseInt(size.height, 10) / 100 * size.presentationHeight; + } + + return size; + + } + + /** + * Stores the vertical index of a stack so that the same + * vertical slide can be selected when navigating to and + * from the stack. + * + * @param {HTMLElement} stack The vertical stack element + * @param {string|number} [v=0] Index to memorize + */ + function setPreviousVerticalIndex(stack, v) { + + if (typeof stack === 'object' && typeof stack.setAttribute === 'function') { + stack.setAttribute('data-previous-indexv', v || 0); + } + + } + + /** + * Retrieves the vertical index which was stored using + * #setPreviousVerticalIndex() or 0 if no previous index + * exists. + * + * @param {HTMLElement} stack The vertical stack element + */ + function getPreviousVerticalIndex(stack) { + + if (typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains('stack')) { + // Prefer manually defined start-indexv + var attributeName = stack.hasAttribute('data-start-indexv') ? 'data-start-indexv' : 'data-previous-indexv'; + + return parseInt(stack.getAttribute(attributeName) || 0, 10); + } + + return 0; + + } + + /** + * Displays the overview of slides (quick nav) by scaling + * down and arranging all slide elements. + */ + function activateOverview() { + + // Only proceed if enabled in config + if (config.overview && !isOverview()) { + + overview = true; + + dom.wrapper.classList.add('overview'); + dom.wrapper.classList.remove('overview-deactivating'); + + if (features.overviewTransitions) { + setTimeout(function () { + dom.wrapper.classList.add('overview-animated'); + }, 1); + } + + // Don't auto-slide while in overview mode + cancelAutoSlide(); + + // Move the backgrounds element into the slide container to + // that the same scaling is applied + dom.slides.appendChild(dom.background); + + // Clicking on an overview slide navigates to it + toArray(dom.wrapper.querySelectorAll(SLIDES_SELECTOR)).forEach(function (slide) { + if (!slide.classList.contains('stack')) { + slide.addEventListener('click', onOverviewSlideClicked, true); + } + }); + + // Calculate slide sizes + var margin = 70; + var slideSize = getComputedSlideSize(); + overviewSlideWidth = slideSize.width + margin; + overviewSlideHeight = slideSize.height + margin; + + // Reverse in RTL mode + if (config.rtl) { + overviewSlideWidth = -overviewSlideWidth; + } - } - - /** - * Unwrap all 3D links. - */ - function disableRollingLinks() { - - var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' ); - - for( var i = 0, len = anchors.length; i < len; i++ ) { - var anchor = anchors[i]; - var span = anchor.querySelector( 'span' ); - - if( span ) { - anchor.classList.remove( 'roll' ); - anchor.innerHTML = span.innerHTML; - } - } - - } - - /** - * Bind preview frame links. - * - * @param {string} [selector=a] - selector for anchors - */ - function enablePreviewLinks( selector ) { - - var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) ); - - anchors.forEach( function( element ) { - if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) { - element.addEventListener( 'click', onPreviewLinkClicked, false ); - } - } ); - - } - - /** - * Unbind preview frame links. - */ - function disablePreviewLinks( selector ) { - - var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) ); - - anchors.forEach( function( element ) { - if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) { - element.removeEventListener( 'click', onPreviewLinkClicked, false ); - } - } ); - - } - - /** - * Opens a preview window for the target URL. - * - * @param {string} url - url for preview iframe src - */ - function showPreview( url ) { - - closeOverlay(); - - dom.overlay = document.createElement( 'div' ); - dom.overlay.classList.add( 'overlay' ); - dom.overlay.classList.add( 'overlay-preview' ); - dom.wrapper.appendChild( dom.overlay ); - - dom.overlay.innerHTML = [ - '
', - '', - '', - '
', - '', - '
', - '', - '', - 'Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).', - '', - '
' - ].join(''); - - dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) { - dom.overlay.classList.add( 'loaded' ); - }, false ); - - dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) { - closeOverlay(); - event.preventDefault(); - }, false ); - - dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) { - closeOverlay(); - }, false ); - - setTimeout( function() { - dom.overlay.classList.add( 'visible' ); - }, 1 ); - - } - - /** - * Open or close help overlay window. - * - * @param {Boolean} [override] Flag which overrides the - * toggle logic and forcibly sets the desired state. True means - * help is open, false means it's closed. - */ - function toggleHelp( override ){ - - if( typeof override === 'boolean' ) { - override ? showHelp() : closeOverlay(); - } - else { - if( dom.overlay ) { - closeOverlay(); - } - else { - showHelp(); - } - } - } - - /** - * Opens an overlay window with help material. - */ - function showHelp() { - - if( config.help ) { - - closeOverlay(); - - dom.overlay = document.createElement( 'div' ); - dom.overlay.classList.add( 'overlay' ); - dom.overlay.classList.add( 'overlay-help' ); - dom.wrapper.appendChild( dom.overlay ); - - var html = '

Keyboard Shortcuts


'; - - html += ''; - for( var key in keyboardShortcuts ) { - html += ''; - } - - // Add custom key bindings that have associated descriptions - for( var binding in registeredKeyBindings ) { - if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) { - html += ''; - } - } - - html += '
KEYACTION
' + key + '' + keyboardShortcuts[ key ] + '
' + registeredKeyBindings[binding].key + '' + registeredKeyBindings[binding].description + '
'; - - dom.overlay.innerHTML = [ - '
', - '', - '
', - '
', - '
'+ html +'
', - '
' - ].join(''); - - dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) { - closeOverlay(); - event.preventDefault(); - }, false ); - - setTimeout( function() { - dom.overlay.classList.add( 'visible' ); - }, 1 ); - - } - - } - - /** - * Closes any currently open overlay. - */ - function closeOverlay() { - - if( dom.overlay ) { - dom.overlay.parentNode.removeChild( dom.overlay ); - dom.overlay = null; - } - - } - - /** - * Applies JavaScript-controlled layout rules to the - * presentation. - */ - function layout() { - - if( dom.wrapper && !isPrintingPDF() ) { - - if( !config.disableLayout ) { - - var size = getComputedSlideSize(); - - // Layout the contents of the slides - layoutSlideContents( config.width, config.height ); - - dom.slides.style.width = size.width + 'px'; - dom.slides.style.height = size.height + 'px'; - - // Determine scale of content to fit within available space - scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height ); - - // Respect max/min scale settings - scale = Math.max( scale, config.minScale ); - scale = Math.min( scale, config.maxScale ); - - // Don't apply any scaling styles if scale is 1 - if( scale === 1 ) { - dom.slides.style.zoom = ''; - dom.slides.style.left = ''; - dom.slides.style.top = ''; - dom.slides.style.bottom = ''; - dom.slides.style.right = ''; - transformSlides( { layout: '' } ); - } - else { - // Prefer zoom for scaling up so that content remains crisp. - // Don't use zoom to scale down since that can lead to shifts - // in text layout/line breaks. - if( scale > 1 && features.zoom ) { - dom.slides.style.zoom = scale; - dom.slides.style.left = ''; - dom.slides.style.top = ''; - dom.slides.style.bottom = ''; - dom.slides.style.right = ''; - transformSlides( { layout: '' } ); - } - // Apply scale transform as a fallback - else { - dom.slides.style.zoom = ''; - dom.slides.style.left = '50%'; - dom.slides.style.top = '50%'; - dom.slides.style.bottom = 'auto'; - dom.slides.style.right = 'auto'; - transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } ); - } - } - - // Select all slides, vertical and horizontal - var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ); - - for( var i = 0, len = slides.length; i < len; i++ ) { - var slide = slides[ i ]; - - // Don't bother updating invisible slides - if( slide.style.display === 'none' ) { - continue; - } - - if( config.center || slide.classList.contains( 'center' ) ) { - // Vertical stacks are not centred since their section - // children will be - if( slide.classList.contains( 'stack' ) ) { - slide.style.top = 0; - } - else { - slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px'; - } - } - else { - slide.style.top = ''; - } - - } - - } - - updateProgress(); - updateParallax(); - - if( isOverview() ) { - updateOverview(); - } - - } - - } - - /** - * Applies layout logic to the contents of all slides in - * the presentation. - * - * @param {string|number} width - * @param {string|number} height - */ - function layoutSlideContents( width, height ) { - - // Handle sizing of elements with the 'stretch' class - toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) { - - // Determine how much vertical space we can use - var remainingHeight = getRemainingHeight( element, height ); - - // Consider the aspect ratio of media elements - if( /(img|video)/gi.test( element.nodeName ) ) { - var nw = element.naturalWidth || element.videoWidth, - nh = element.naturalHeight || element.videoHeight; - - var es = Math.min( width / nw, remainingHeight / nh ); - - element.style.width = ( nw * es ) + 'px'; - element.style.height = ( nh * es ) + 'px'; - - } - else { - element.style.width = width + 'px'; - element.style.height = remainingHeight + 'px'; - } - - } ); - - } - - /** - * Calculates the computed pixel size of our slides. These - * values are based on the width and height configuration - * options. - * - * @param {number} [presentationWidth=dom.wrapper.offsetWidth] - * @param {number} [presentationHeight=dom.wrapper.offsetHeight] - */ - function getComputedSlideSize( presentationWidth, presentationHeight ) { - - var size = { - // Slide size - width: config.width, - height: config.height, - - // Presentation size - presentationWidth: presentationWidth || dom.wrapper.offsetWidth, - presentationHeight: presentationHeight || dom.wrapper.offsetHeight - }; - - // Reduce available space by margin - size.presentationWidth -= ( size.presentationWidth * config.margin ); - size.presentationHeight -= ( size.presentationHeight * config.margin ); - - // Slide width may be a percentage of available width - if( typeof size.width === 'string' && /%$/.test( size.width ) ) { - size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth; - } - - // Slide height may be a percentage of available height - if( typeof size.height === 'string' && /%$/.test( size.height ) ) { - size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight; - } - - return size; - - } - - /** - * Stores the vertical index of a stack so that the same - * vertical slide can be selected when navigating to and - * from the stack. - * - * @param {HTMLElement} stack The vertical stack element - * @param {string|number} [v=0] Index to memorize - */ - function setPreviousVerticalIndex( stack, v ) { - - if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) { - stack.setAttribute( 'data-previous-indexv', v || 0 ); - } - - } - - /** - * Retrieves the vertical index which was stored using - * #setPreviousVerticalIndex() or 0 if no previous index - * exists. - * - * @param {HTMLElement} stack The vertical stack element - */ - function getPreviousVerticalIndex( stack ) { - - if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) { - // Prefer manually defined start-indexv - var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv'; - - return parseInt( stack.getAttribute( attributeName ) || 0, 10 ); - } - - return 0; - - } - - /** - * Displays the overview of slides (quick nav) by scaling - * down and arranging all slide elements. - */ - function activateOverview() { - - // Only proceed if enabled in config - if( config.overview && !isOverview() ) { - - overview = true; - - dom.wrapper.classList.add( 'overview' ); - dom.wrapper.classList.remove( 'overview-deactivating' ); - - if( features.overviewTransitions ) { - setTimeout( function() { - dom.wrapper.classList.add( 'overview-animated' ); - }, 1 ); - } - - // Don't auto-slide while in overview mode - cancelAutoSlide(); - - // Move the backgrounds element into the slide container to - // that the same scaling is applied - dom.slides.appendChild( dom.background ); - - // Clicking on an overview slide navigates to it - toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) { - if( !slide.classList.contains( 'stack' ) ) { - slide.addEventListener( 'click', onOverviewSlideClicked, true ); - } - } ); - - // Calculate slide sizes - var margin = 70; - var slideSize = getComputedSlideSize(); - overviewSlideWidth = slideSize.width + margin; - overviewSlideHeight = slideSize.height + margin; - - // Reverse in RTL mode - if( config.rtl ) { - overviewSlideWidth = -overviewSlideWidth; - } + updateSlidesVisibility(); + layoutOverview(); + updateOverview(); - updateSlidesVisibility(); - layoutOverview(); - updateOverview(); + layout(); + + // Notify observers of the overview showing + dispatchEvent('overviewshown', { + 'indexh': indexh, + 'indexv': indexv, + 'currentSlide': currentSlide + }); - layout(); - - // Notify observers of the overview showing - dispatchEvent( 'overviewshown', { - 'indexh': indexh, - 'indexv': indexv, - 'currentSlide': currentSlide - } ); + } - } + } - } + /** + * Uses CSS transforms to position all slides in a grid for + * display inside of the overview mode. + */ + function layoutOverview() { - /** - * Uses CSS transforms to position all slides in a grid for - * display inside of the overview mode. - */ - function layoutOverview() { + // Layout slides + toArray(dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR)).forEach(function (hslide, h) { + hslide.setAttribute('data-index-h', h); + transformElement(hslide, 'translate3d(' + (h * overviewSlideWidth) + 'px, 0, 0)'); - // Layout slides - toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) { - hslide.setAttribute( 'data-index-h', h ); - transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' ); + if (hslide.classList.contains('stack')) { - if( hslide.classList.contains( 'stack' ) ) { + toArray(hslide.querySelectorAll('section')).forEach(function (vslide, v) { + vslide.setAttribute('data-index-h', h); + vslide.setAttribute('data-index-v', v); - toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) { - vslide.setAttribute( 'data-index-h', h ); - vslide.setAttribute( 'data-index-v', v ); + transformElement(vslide, 'translate3d(0, ' + (v * overviewSlideHeight) + 'px, 0)'); + }); - transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' ); - } ); + } + }); - } - } ); + // Layout slide backgrounds + toArray(dom.background.childNodes).forEach(function (hbackground, h) { + transformElement(hbackground, 'translate3d(' + (h * overviewSlideWidth) + 'px, 0, 0)'); - // Layout slide backgrounds - toArray( dom.background.childNodes ).forEach( function( hbackground, h ) { - transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' ); + toArray(hbackground.querySelectorAll('.slide-background')).forEach(function (vbackground, v) { + transformElement(vbackground, 'translate3d(0, ' + (v * overviewSlideHeight) + 'px, 0)'); + }); + }); - toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) { - transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' ); - } ); - } ); + } - } + /** + * Moves the overview viewport to the current slides. + * Called each time the current slide changes. + */ + function updateOverview() { - /** - * Moves the overview viewport to the current slides. - * Called each time the current slide changes. - */ - function updateOverview() { + var vmin = Math.min(window.innerWidth, window.innerHeight); + var scale = Math.max(vmin / 5, 150) / vmin; - var vmin = Math.min( window.innerWidth, window.innerHeight ); - var scale = Math.max( vmin / 5, 150 ) / vmin; + transformSlides({ + overview: [ + 'scale(' + scale + ')', + 'translateX(' + (-indexh * overviewSlideWidth) + 'px)', + 'translateY(' + (-indexv * overviewSlideHeight) + 'px)' + ].join(' ') + }); - transformSlides( { - overview: [ - 'scale('+ scale +')', - 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)', - 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)' - ].join( ' ' ) - } ); - - } - - /** - * Exits the slide overview and enters the currently - * active slide. - */ - function deactivateOverview() { - - // Only proceed if enabled in config - if( config.overview ) { - - overview = false; - - dom.wrapper.classList.remove( 'overview' ); - dom.wrapper.classList.remove( 'overview-animated' ); - - // Temporarily add a class so that transitions can do different things - // depending on whether they are exiting/entering overview, or just - // moving from slide to slide - dom.wrapper.classList.add( 'overview-deactivating' ); - - setTimeout( function () { - dom.wrapper.classList.remove( 'overview-deactivating' ); - }, 1 ); - - // Move the background element back out - dom.wrapper.appendChild( dom.background ); - - // Clean up changes made to slides - toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) { - transformElement( slide, '' ); - - slide.removeEventListener( 'click', onOverviewSlideClicked, true ); - } ); - - // Clean up changes made to backgrounds - toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) { - transformElement( background, '' ); - } ); - - transformSlides( { overview: '' } ); - - slide( indexh, indexv ); - - layout(); - - cueAutoSlide(); - - // Notify observers of the overview hiding - dispatchEvent( 'overviewhidden', { - 'indexh': indexh, - 'indexv': indexv, - 'currentSlide': currentSlide - } ); - - } - } - - /** - * Toggles the slide overview mode on and off. - * - * @param {Boolean} [override] Flag which overrides the - * toggle logic and forcibly sets the desired state. True means - * overview is open, false means it's closed. - */ - function toggleOverview( override ) { - - if( typeof override === 'boolean' ) { - override ? activateOverview() : deactivateOverview(); - } - else { - isOverview() ? deactivateOverview() : activateOverview(); - } - - } - - /** - * Checks if the overview is currently active. - * - * @return {Boolean} true if the overview is active, - * false otherwise - */ - function isOverview() { - - return overview; - - } - - /** - * Return a hash URL that will resolve to the current slide location. - */ - function locationHash() { - - var url = '/'; - - // Attempt to create a named link based on the slide's ID - var id = currentSlide ? currentSlide.getAttribute( 'id' ) : null; - if( id ) { - id = encodeURIComponent( id ); - } - - var indexf; - if( config.fragmentInURL ) { - indexf = getIndices().f; - } - - // If the current slide has an ID, use that as a named link, - // but we don't support named links with a fragment index - if( typeof id === 'string' && id.length && indexf === undefined ) { - url = '/' + id; - } - // Otherwise use the /h/v index - else { - var hashIndexBase = config.hashOneBasedIndex ? 1 : 0; - if( indexh > 0 || indexv > 0 || indexf !== undefined ) url += indexh + hashIndexBase; - if( indexv > 0 || indexf !== undefined ) url += '/' + (indexv + hashIndexBase ); - if( indexf !== undefined ) url += '/' + indexf; - } - - return url; - - } - - /** - * Checks if the current or specified slide is vertical - * (nested within another slide). - * - * @param {HTMLElement} [slide=currentSlide] The slide to check - * orientation of - * @return {Boolean} - */ - function isVerticalSlide( slide ) { - - // Prefer slide argument, otherwise use current slide - slide = slide ? slide : currentSlide; - - return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i ); - - } - - /** - * Handling the fullscreen functionality via the fullscreen API - * - * @see http://fullscreen.spec.whatwg.org/ - * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode - */ - function enterFullscreen() { - - var element = document.documentElement; - - // Check which implementation is available - var requestMethod = element.requestFullscreen || - element.webkitRequestFullscreen || - element.webkitRequestFullScreen || - element.mozRequestFullScreen || - element.msRequestFullscreen; - - if( requestMethod ) { - requestMethod.apply( element ); - } - - } - - /** - * Enters the paused mode which fades everything on screen to - * black. - */ - function pause() { - - if( config.pause ) { - var wasPaused = dom.wrapper.classList.contains( 'paused' ); - - cancelAutoSlide(); - dom.wrapper.classList.add( 'paused' ); - - if( wasPaused === false ) { - dispatchEvent( 'paused' ); - } - } - - } - - /** - * Exits from the paused mode. - */ - function resume() { - - var wasPaused = dom.wrapper.classList.contains( 'paused' ); - dom.wrapper.classList.remove( 'paused' ); - - cueAutoSlide(); - - if( wasPaused ) { - dispatchEvent( 'resumed' ); - } - - } - - /** - * Toggles the paused mode on and off. - */ - function togglePause( override ) { - - if( typeof override === 'boolean' ) { - override ? pause() : resume(); - } - else { - isPaused() ? resume() : pause(); - } - - } - - /** - * Checks if we are currently in the paused mode. - * - * @return {Boolean} - */ - function isPaused() { + } + + /** + * Exits the slide overview and enters the currently + * active slide. + */ + function deactivateOverview() { + + // Only proceed if enabled in config + if (config.overview) { + + overview = false; + + dom.wrapper.classList.remove('overview'); + dom.wrapper.classList.remove('overview-animated'); + + // Temporarily add a class so that transitions can do different things + // depending on whether they are exiting/entering overview, or just + // moving from slide to slide + dom.wrapper.classList.add('overview-deactivating'); + + setTimeout(function () { + dom.wrapper.classList.remove('overview-deactivating'); + }, 1); + + // Move the background element back out + dom.wrapper.appendChild(dom.background); + + // Clean up changes made to slides + toArray(dom.wrapper.querySelectorAll(SLIDES_SELECTOR)).forEach(function (slide) { + transformElement(slide, ''); + + slide.removeEventListener('click', onOverviewSlideClicked, true); + }); + + // Clean up changes made to backgrounds + toArray(dom.background.querySelectorAll('.slide-background')).forEach(function (background) { + transformElement(background, ''); + }); + + transformSlides({overview: ''}); + + slide(indexh, indexv); + + layout(); + + cueAutoSlide(); + + // Notify observers of the overview hiding + dispatchEvent('overviewhidden', { + 'indexh': indexh, + 'indexv': indexv, + 'currentSlide': currentSlide + }); + + } + } + + /** + * Toggles the slide overview mode on and off. + * + * @param {Boolean} [override] Flag which overrides the + * toggle logic and forcibly sets the desired state. True means + * overview is open, false means it's closed. + */ + function toggleOverview(override) { + + if (typeof override === 'boolean') { + override ? activateOverview() : deactivateOverview(); + } else { + isOverview() ? deactivateOverview() : activateOverview(); + } + + } + + /** + * Checks if the overview is currently active. + * + * @return {Boolean} true if the overview is active, + * false otherwise + */ + function isOverview() { + + return overview; + + } + + /** + * Return a hash URL that will resolve to the current slide location. + */ + function locationHash() { + + var url = '/'; + + // Attempt to create a named link based on the slide's ID + var id = currentSlide ? currentSlide.getAttribute('id') : null; + if (id) { + id = encodeURIComponent(id); + } - return dom.wrapper.classList.contains( 'paused' ); - - } - - /** - * Toggles the auto slide mode on and off. - * - * @param {Boolean} [override] Flag which sets the desired state. - * True means autoplay starts, false means it stops. - */ - - function toggleAutoSlide( override ) { + var indexf; + if (config.fragmentInURL) { + indexf = getIndices().f; + } + + // If the current slide has an ID, use that as a named link, + // but we don't support named links with a fragment index + if (typeof id === 'string' && id.length && indexf === undefined) { + url = '/' + id; + } + // Otherwise use the /h/v index + else { + var hashIndexBase = config.hashOneBasedIndex ? 1 : 0; + if (indexh > 0 || indexv > 0 || indexf !== undefined) url += indexh + hashIndexBase; + if (indexv > 0 || indexf !== undefined) url += '/' + (indexv + hashIndexBase); + if (indexf !== undefined) url += '/' + indexf; + } + + return url; + + } + + /** + * Checks if the current or specified slide is vertical + * (nested within another slide). + * + * @param {HTMLElement} [slide=currentSlide] The slide to check + * orientation of + * @return {Boolean} + */ + function isVerticalSlide(slide) { + + // Prefer slide argument, otherwise use current slide + slide = slide ? slide : currentSlide; + + return slide && slide.parentNode && !!slide.parentNode.nodeName.match(/section/i); + + } + + /** + * Handling the fullscreen functionality via the fullscreen API + * + * @see http://fullscreen.spec.whatwg.org/ + * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode + */ + function enterFullscreen() { + + var element = document.documentElement; + + // Check which implementation is available + var requestMethod = element.requestFullscreen || + element.webkitRequestFullscreen || + element.webkitRequestFullScreen || + element.mozRequestFullScreen || + element.msRequestFullscreen; + + if (requestMethod) { + requestMethod.apply(element); + } + + } + + /** + * Enters the paused mode which fades everything on screen to + * black. + */ + function pause() { + + if (config.pause) { + var wasPaused = dom.wrapper.classList.contains('paused'); + + cancelAutoSlide(); + dom.wrapper.classList.add('paused'); + + if (wasPaused === false) { + dispatchEvent('paused'); + } + } + + } + + /** + * Exits from the paused mode. + */ + function resume() { + + var wasPaused = dom.wrapper.classList.contains('paused'); + dom.wrapper.classList.remove('paused'); + + cueAutoSlide(); + + if (wasPaused) { + dispatchEvent('resumed'); + } + + } + + /** + * Toggles the paused mode on and off. + */ + function togglePause(override) { + + if (typeof override === 'boolean') { + override ? pause() : resume(); + } else { + isPaused() ? resume() : pause(); + } + + } + + /** + * Checks if we are currently in the paused mode. + * + * @return {Boolean} + */ + function isPaused() { + + return dom.wrapper.classList.contains('paused'); + + } + + /** + * Toggles the auto slide mode on and off. + * + * @param {Boolean} [override] Flag which sets the desired state. + * True means autoplay starts, false means it stops. + */ + + function toggleAutoSlide(override) { + + if (typeof override === 'boolean') { + override ? resumeAutoSlide() : pauseAutoSlide(); + } else { + autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide(); + } + + } + + /** + * Checks if the auto slide mode is currently on. + * + * @return {Boolean} + */ + function isAutoSliding() { + + return !!(autoSlide && !autoSlidePaused); + + } + + /** + * Steps from the current point in the presentation to the + * slide which matches the specified horizontal and vertical + * indices. + * + * @param {number} [h=indexh] Horizontal index of the target slide + * @param {number} [v=indexv] Vertical index of the target slide + * @param {number} [f] Index of a fragment within the + * target slide to activate + * @param {number} [o] Origin for use in multimaster environments + */ + function slide(h, v, f, o) { + + // Remember where we were at before + previousSlide = currentSlide; + + // Query all horizontal slides in the deck + var horizontalSlides = dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR); + + // Abort if there are no slides + if (horizontalSlides.length === 0) return; + + // If no vertical index is specified and the upcoming slide is a + // stack, resume at its previous vertical index + if (v === undefined && !isOverview()) { + v = getPreviousVerticalIndex(horizontalSlides[h]); + } + + // If we were on a vertical stack, remember what vertical index + // it was on so we can resume at the same position when returning + if (previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains('stack')) { + setPreviousVerticalIndex(previousSlide.parentNode, indexv); + } + + // Remember the state before this slide + var stateBefore = state.concat(); + + // Reset the state array + state.length = 0; + + var indexhBefore = indexh || 0, + indexvBefore = indexv || 0; + + // Activate and transition to the new slide + indexh = updateSlides(HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h); + indexv = updateSlides(VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v); + + // Update the visibility of slides now that the indices have changed + updateSlidesVisibility(); + + layout(); + + // Apply the new state + stateLoop: for (var i = 0, len = state.length; i < len; i++) { + // Check if this state existed on the previous slide. If it + // did, we will avoid adding it repeatedly + for (var j = 0; j < stateBefore.length; j++) { + if (stateBefore[j] === state[i]) { + stateBefore.splice(j, 1); + continue stateLoop; + } + } + + document.documentElement.classList.add(state[i]); + + // Dispatch custom event matching the state's name + dispatchEvent(state[i]); + } + + // Clean up the remains of the previous state + while (stateBefore.length) { + document.documentElement.classList.remove(stateBefore.pop()); + } + + // Update the overview if it's currently active + if (isOverview()) { + updateOverview(); + } + + // Find the current horizontal slide and any possible vertical slides + // within it + var currentHorizontalSlide = horizontalSlides[indexh], + currentVerticalSlides = currentHorizontalSlide.querySelectorAll('section'); + + // Store references to the previous and current slides + currentSlide = currentVerticalSlides[indexv] || currentHorizontalSlide; + + // Show fragment, if specified + if (typeof f !== 'undefined') { + navigateFragment(f); + } + + // Dispatch an event if the slide changed + var slideChanged = (indexh !== indexhBefore || indexv !== indexvBefore); + if (!slideChanged) { + // Ensure that the previous slide is never the same as the current + previousSlide = null; + } + + // Solves an edge case where the previous slide maintains the + // 'present' class when navigating between adjacent vertical + // stacks + if (previousSlide && previousSlide !== currentSlide) { + previousSlide.classList.remove('present'); + previousSlide.setAttribute('aria-hidden', 'true'); + + // Reset all slides upon navigate to home + // Issue: #285 + if (dom.wrapper.querySelector(HOME_SLIDE_SELECTOR).classList.contains('present')) { + // Launch async task + setTimeout(function () { + var slides = toArray(dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR + '.stack')), + i; + for (i in slides) { + if (slides[i]) { + // Reset stack + setPreviousVerticalIndex(slides[i], 0); + } + } + }, 0); + } + } + + if (slideChanged) { + dispatchEvent('slidechanged', { + 'indexh': indexh, + 'indexv': indexv, + 'previousSlide': previousSlide, + 'currentSlide': currentSlide, + 'origin': o + }); + } + + // Handle embedded content + if (slideChanged || !previousSlide) { + stopEmbeddedContent(previousSlide); + startEmbeddedContent(currentSlide); + } + + // Announce the current slide contents, for screen readers + dom.statusDiv.textContent = getStatusText(currentSlide); + + updateControls(); + updateProgress(); + updateBackground(); + updateParallax(); + updateSlideNumber(); + updateNotes(); + + // Update the URL hash + writeURL(); + + cueAutoSlide(); + + } + + /** + * Syncs the presentation with the current DOM. Useful + * when new slides or control elements are added or when + * the configuration has changed. + */ + function sync() { + + // Subscribe to input + removeEventListeners(); + addEventListeners(); + + // Force a layout to make sure the current config is accounted for + layout(); + + // Reflect the current autoSlide value + autoSlide = config.autoSlide; + + // Start auto-sliding if it's enabled + cueAutoSlide(); + + // Re-create the slide backgrounds + createBackgrounds(); + + // Write the current hash to the URL + writeURL(); + + sortAllFragments(); + + updateControls(); + updateProgress(); + updateSlideNumber(); + updateSlidesVisibility(); + updateBackground(true); + updateNotesVisibility(); + updateNotes(); + + formatEmbeddedContent(); + + // Start or stop embedded content depending on global config + if (config.autoPlayMedia === false) { + stopEmbeddedContent(currentSlide, {unloadIframes: false}); + } else { + startEmbeddedContent(currentSlide); + } + + if (isOverview()) { + layoutOverview(); + } - if( typeof override === 'boolean' ) { - override ? resumeAutoSlide() : pauseAutoSlide(); - } - - else { - autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide(); - } - - } - - /** - * Checks if the auto slide mode is currently on. - * - * @return {Boolean} - */ - function isAutoSliding() { - - return !!( autoSlide && !autoSlidePaused ); - - } - - /** - * Steps from the current point in the presentation to the - * slide which matches the specified horizontal and vertical - * indices. - * - * @param {number} [h=indexh] Horizontal index of the target slide - * @param {number} [v=indexv] Vertical index of the target slide - * @param {number} [f] Index of a fragment within the - * target slide to activate - * @param {number} [o] Origin for use in multimaster environments - */ - function slide( h, v, f, o ) { - - // Remember where we were at before - previousSlide = currentSlide; - - // Query all horizontal slides in the deck - var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ); - - // Abort if there are no slides - if( horizontalSlides.length === 0 ) return; - - // If no vertical index is specified and the upcoming slide is a - // stack, resume at its previous vertical index - if( v === undefined && !isOverview() ) { - v = getPreviousVerticalIndex( horizontalSlides[ h ] ); - } - - // If we were on a vertical stack, remember what vertical index - // it was on so we can resume at the same position when returning - if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) { - setPreviousVerticalIndex( previousSlide.parentNode, indexv ); - } - - // Remember the state before this slide - var stateBefore = state.concat(); - - // Reset the state array - state.length = 0; - - var indexhBefore = indexh || 0, - indexvBefore = indexv || 0; - - // Activate and transition to the new slide - indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h ); - indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v ); - - // Update the visibility of slides now that the indices have changed - updateSlidesVisibility(); - - layout(); - - // Apply the new state - stateLoop: for( var i = 0, len = state.length; i < len; i++ ) { - // Check if this state existed on the previous slide. If it - // did, we will avoid adding it repeatedly - for( var j = 0; j < stateBefore.length; j++ ) { - if( stateBefore[j] === state[i] ) { - stateBefore.splice( j, 1 ); - continue stateLoop; - } - } - - document.documentElement.classList.add( state[i] ); - - // Dispatch custom event matching the state's name - dispatchEvent( state[i] ); - } - - // Clean up the remains of the previous state - while( stateBefore.length ) { - document.documentElement.classList.remove( stateBefore.pop() ); - } - - // Update the overview if it's currently active - if( isOverview() ) { - updateOverview(); - } - - // Find the current horizontal slide and any possible vertical slides - // within it - var currentHorizontalSlide = horizontalSlides[ indexh ], - currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' ); - - // Store references to the previous and current slides - currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide; - - // Show fragment, if specified - if( typeof f !== 'undefined' ) { - navigateFragment( f ); - } - - // Dispatch an event if the slide changed - var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore ); - if (!slideChanged) { - // Ensure that the previous slide is never the same as the current - previousSlide = null; - } - - // Solves an edge case where the previous slide maintains the - // 'present' class when navigating between adjacent vertical - // stacks - if( previousSlide && previousSlide !== currentSlide ) { - previousSlide.classList.remove( 'present' ); - previousSlide.setAttribute( 'aria-hidden', 'true' ); - - // Reset all slides upon navigate to home - // Issue: #285 - if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) { - // Launch async task - setTimeout( function () { - var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i; - for( i in slides ) { - if( slides[i] ) { - // Reset stack - setPreviousVerticalIndex( slides[i], 0 ); - } - } - }, 0 ); - } - } - - if( slideChanged ) { - dispatchEvent( 'slidechanged', { - 'indexh': indexh, - 'indexv': indexv, - 'previousSlide': previousSlide, - 'currentSlide': currentSlide, - 'origin': o - } ); - } - - // Handle embedded content - if( slideChanged || !previousSlide ) { - stopEmbeddedContent( previousSlide ); - startEmbeddedContent( currentSlide ); - } - - // Announce the current slide contents, for screen readers - dom.statusDiv.textContent = getStatusText( currentSlide ); - - updateControls(); - updateProgress(); - updateBackground(); - updateParallax(); - updateSlideNumber(); - updateNotes(); - - // Update the URL hash - writeURL(); - - cueAutoSlide(); - - } - - /** - * Syncs the presentation with the current DOM. Useful - * when new slides or control elements are added or when - * the configuration has changed. - */ - function sync() { - - // Subscribe to input - removeEventListeners(); - addEventListeners(); - - // Force a layout to make sure the current config is accounted for - layout(); - - // Reflect the current autoSlide value - autoSlide = config.autoSlide; - - // Start auto-sliding if it's enabled - cueAutoSlide(); - - // Re-create the slide backgrounds - createBackgrounds(); - - // Write the current hash to the URL - writeURL(); - - sortAllFragments(); - - updateControls(); - updateProgress(); - updateSlideNumber(); - updateSlidesVisibility(); - updateBackground( true ); - updateNotesVisibility(); - updateNotes(); - - formatEmbeddedContent(); - - // Start or stop embedded content depending on global config - if( config.autoPlayMedia === false ) { - stopEmbeddedContent( currentSlide, { unloadIframes: false } ); - } - else { - startEmbeddedContent( currentSlide ); - } - - if( isOverview() ) { - layoutOverview(); - } + } - } + /** + * Updates reveal.js to keep in sync with new slide attributes. For + * example, if you add a new `data-background-image` you can call + * this to have reveal.js render the new background image. + * + * Similar to #sync() but more efficient when you only need to + * refresh a specific slide. + * + * @param {HTMLElement} slide + */ + function syncSlide(slide) { - /** - * Updates reveal.js to keep in sync with new slide attributes. For - * example, if you add a new `data-background-image` you can call - * this to have reveal.js render the new background image. - * - * Similar to #sync() but more efficient when you only need to - * refresh a specific slide. - * - * @param {HTMLElement} slide - */ - function syncSlide( slide ) { + syncBackground(slide); + syncFragments(slide); - syncBackground( slide ); - syncFragments( slide ); + updateBackground(); + updateNotes(); - updateBackground(); - updateNotes(); + loadSlide(slide); - loadSlide( slide ); + } - } + /** + * Formats the fragments on the given slide so that they have + * valid indices. Call this if fragments are changed in the DOM + * after reveal.js has already initialized. + * + * @param {HTMLElement} slide + */ + function syncFragments(slide) { - /** - * Formats the fragments on the given slide so that they have - * valid indices. Call this if fragments are changed in the DOM - * after reveal.js has already initialized. - * - * @param {HTMLElement} slide - */ - function syncFragments( slide ) { + sortFragments(slide.querySelectorAll('.fragment')); - sortFragments( slide.querySelectorAll( '.fragment' ) ); + } - } + /** + * Resets all vertical slides so that only the first + * is visible. + */ + function resetVerticalSlides() { - /** - * Resets all vertical slides so that only the first - * is visible. - */ - function resetVerticalSlides() { + var horizontalSlides = toArray(dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR)); + horizontalSlides.forEach(function (horizontalSlide) { - var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); - horizontalSlides.forEach( function( horizontalSlide ) { + var verticalSlides = toArray(horizontalSlide.querySelectorAll('section')); + verticalSlides.forEach(function (verticalSlide, y) { - var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); - verticalSlides.forEach( function( verticalSlide, y ) { + if (y > 0) { + verticalSlide.classList.remove('present'); + verticalSlide.classList.remove('past'); + verticalSlide.classList.add('future'); + verticalSlide.setAttribute('aria-hidden', 'true'); + } - if( y > 0 ) { - verticalSlide.classList.remove( 'present' ); - verticalSlide.classList.remove( 'past' ); - verticalSlide.classList.add( 'future' ); - verticalSlide.setAttribute( 'aria-hidden', 'true' ); - } + }); - } ); + }); - } ); + } - } + /** + * Sorts and formats all of fragments in the + * presentation. + */ + function sortAllFragments() { - /** - * Sorts and formats all of fragments in the - * presentation. - */ - function sortAllFragments() { + var horizontalSlides = toArray(dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR)); + horizontalSlides.forEach(function (horizontalSlide) { - var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); - horizontalSlides.forEach( function( horizontalSlide ) { + var verticalSlides = toArray(horizontalSlide.querySelectorAll('section')); + verticalSlides.forEach(function (verticalSlide, y) { - var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); - verticalSlides.forEach( function( verticalSlide, y ) { + sortFragments(verticalSlide.querySelectorAll('.fragment')); - sortFragments( verticalSlide.querySelectorAll( '.fragment' ) ); + }); - } ); + if (verticalSlides.length === 0) sortFragments(horizontalSlide.querySelectorAll('.fragment')); - if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) ); + }); - } ); + } - } + /** + * Randomly shuffles all slides in the deck. + */ + function shuffle() { - /** - * Randomly shuffles all slides in the deck. - */ - function shuffle() { - - var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); - - slides.forEach( function( slide ) { + var slides = toArray(dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR)); + + slides.forEach(function (slide) { - // Insert this slide next to another random slide. This may - // cause the slide to insert before itself but that's fine. - dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] ); - - } ); + // Insert this slide next to another random slide. This may + // cause the slide to insert before itself but that's fine. + dom.slides.insertBefore(slide, slides[Math.floor(Math.random() * slides.length)]); - } - - /** - * Updates one dimension of slides by showing the slide - * with the specified index. - * - * @param {string} selector A CSS selector that will fetch - * the group of slides we are working with - * @param {number} index The index of the slide that should be - * shown - * - * @return {number} The index of the slide that is now shown, - * might differ from the passed in index if it was out of - * bounds. - */ - function updateSlides( selector, index ) { + }); - // Select all slides and convert the NodeList result to - // an array - var slides = toArray( dom.wrapper.querySelectorAll( selector ) ), - slidesLength = slides.length; - - var printMode = isPrintingPDF(); - - if( slidesLength ) { - - // Should the index loop? - if( config.loop ) { - index %= slidesLength; - - if( index < 0 ) { - index = slidesLength + index; - } - } - - // Enforce max and minimum index bounds - index = Math.max( Math.min( index, slidesLength - 1 ), 0 ); - - for( var i = 0; i < slidesLength; i++ ) { - var element = slides[i]; - - var reverse = config.rtl && !isVerticalSlide( element ); - - element.classList.remove( 'past' ); - element.classList.remove( 'present' ); - element.classList.remove( 'future' ); - - // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute - element.setAttribute( 'hidden', '' ); - element.setAttribute( 'aria-hidden', 'true' ); - - // If this element contains vertical slides - if( element.querySelector( 'section' ) ) { - element.classList.add( 'stack' ); - } + } + + /** + * Updates one dimension of slides by showing the slide + * with the specified index. + * + * @param {string} selector A CSS selector that will fetch + * the group of slides we are working with + * @param {number} index The index of the slide that should be + * shown + * + * @return {number} The index of the slide that is now shown, + * might differ from the passed in index if it was out of + * bounds. + */ + function updateSlides(selector, index) { - // If we're printing static slides, all slides are "present" - if( printMode ) { - element.classList.add( 'present' ); - continue; - } - - if( i < index ) { - // Any element previous to index is given the 'past' class - element.classList.add( reverse ? 'future' : 'past' ); - - if( config.fragments ) { - var pastFragments = toArray( element.querySelectorAll( '.fragment' ) ); - - // Show all fragments on prior slides - while( pastFragments.length ) { - var pastFragment = pastFragments.pop(); - pastFragment.classList.add( 'visible' ); - pastFragment.classList.remove( 'current-fragment' ); - } - } - } - else if( i > index ) { - // Any element subsequent to index is given the 'future' class - element.classList.add( reverse ? 'past' : 'future' ); - - if( config.fragments ) { - var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) ); - - // No fragments in future slides should be visible ahead of time - while( futureFragments.length ) { - var futureFragment = futureFragments.pop(); - futureFragment.classList.remove( 'visible' ); - futureFragment.classList.remove( 'current-fragment' ); - } - } - } - } - - // Mark the current slide as present - slides[index].classList.add( 'present' ); - slides[index].removeAttribute( 'hidden' ); - slides[index].removeAttribute( 'aria-hidden' ); - - // If this slide has a state associated with it, add it - // onto the current state of the deck - var slideState = slides[index].getAttribute( 'data-state' ); - if( slideState ) { - state = state.concat( slideState.split( ' ' ) ); - } - - } - else { - // Since there are no slides we can't be anywhere beyond the - // zeroth index - index = 0; - } - - return index; - - } - - /** - * Optimization method; hide all slides that are far away - * from the present slide. - */ - function updateSlidesVisibility() { - - // Select all slides and convert the NodeList result to - // an array - var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ), - horizontalSlidesLength = horizontalSlides.length, - distanceX, - distanceY; - - if( horizontalSlidesLength && typeof indexh !== 'undefined' ) { - - // The number of steps away from the present slide that will - // be visible - var viewDistance = isOverview() ? 10 : config.viewDistance; - - // Limit view distance on weaker devices - if( isMobileDevice ) { - viewDistance = isOverview() ? 6 : 2; - } - - // All slides need to be visible when exporting to PDF - if( isPrintingPDF() ) { - viewDistance = Number.MAX_VALUE; - } - - for( var x = 0; x < horizontalSlidesLength; x++ ) { - var horizontalSlide = horizontalSlides[x]; - - var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ), - verticalSlidesLength = verticalSlides.length; - - // Determine how far away this slide is from the present - distanceX = Math.abs( ( indexh || 0 ) - x ) || 0; - - // If the presentation is looped, distance should measure - // 1 between the first and last slides - if( config.loop ) { - distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0; - } - - // Show the horizontal slide if it's within the view distance - if( distanceX < viewDistance ) { - loadSlide( horizontalSlide ); - } - else { - unloadSlide( horizontalSlide ); - } - - if( verticalSlidesLength ) { - - var oy = getPreviousVerticalIndex( horizontalSlide ); - - for( var y = 0; y < verticalSlidesLength; y++ ) { - var verticalSlide = verticalSlides[y]; - - distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy ); - - if( distanceX + distanceY < viewDistance ) { - loadSlide( verticalSlide ); - } - else { - unloadSlide( verticalSlide ); - } - } - - } - } - - // Flag if there are ANY vertical slides, anywhere in the deck - if( dom.wrapper.querySelectorAll( '.slides>section>section' ).length ) { - dom.wrapper.classList.add( 'has-vertical-slides' ); - } - else { - dom.wrapper.classList.remove( 'has-vertical-slides' ); - } - - // Flag if there are ANY horizontal slides, anywhere in the deck - if( dom.wrapper.querySelectorAll( '.slides>section' ).length > 1 ) { - dom.wrapper.classList.add( 'has-horizontal-slides' ); - } - else { - dom.wrapper.classList.remove( 'has-horizontal-slides' ); - } - - } - - } - - /** - * Pick up notes from the current slide and display them - * to the viewer. - * - * @see {@link config.showNotes} - */ - function updateNotes() { - - if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) { - - dom.speakerNotes.innerHTML = getSlideNotes() || 'No notes on this slide.'; - - } - - } - - /** - * Updates the visibility of the speaker notes sidebar that - * is used to share annotated slides. The notes sidebar is - * only visible if showNotes is true and there are notes on - * one or more slides in the deck. - */ - function updateNotesVisibility() { - - if( config.showNotes && hasNotes() ) { - dom.wrapper.classList.add( 'show-notes' ); - } - else { - dom.wrapper.classList.remove( 'show-notes' ); - } - - } - - /** - * Checks if there are speaker notes for ANY slide in the - * presentation. - */ - function hasNotes() { - - return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0; - - } - - /** - * Updates the progress bar to reflect the current slide. - */ - function updateProgress() { - - // Update progress if enabled - if( config.progress && dom.progressbar ) { - - dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px'; - - } - - } - - - /** - * Updates the slide number div to reflect the current slide. - * - * The following slide number formats are available: - * "h.v": horizontal . vertical slide number (default) - * "h/v": horizontal / vertical slide number - * "c": flattened slide number - * "c/t": flattened slide number / total slides - */ - function updateSlideNumber() { - - // Update slide number if enabled - if( config.slideNumber && dom.slideNumber ) { - - var value = []; - var format = 'h.v'; - - // Check if a custom number format is available - if( typeof config.slideNumber === 'string' ) { - format = config.slideNumber; - } - - // If there are ONLY vertical slides in this deck, always use - // a flattened slide number - if( !/c/.test( format ) && dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length === 1 ) { - format = 'c'; - } - - switch( format ) { - case 'c': - value.push( getSlidePastCount() + 1 ); - break; - case 'c/t': - value.push( getSlidePastCount() + 1, '/', getTotalSlides() ); - break; - case 'h/v': - value.push( indexh + 1 ); - if( isVerticalSlide() ) value.push( '/', indexv + 1 ); - break; - default: - value.push( indexh + 1 ); - if( isVerticalSlide() ) value.push( '.', indexv + 1 ); - } - - dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] ); - } - - } - - /** - * Applies HTML formatting to a slide number before it's - * written to the DOM. - * - * @param {number} a Current slide - * @param {string} delimiter Character to separate slide numbers - * @param {(number|*)} b Total slides - * @return {string} HTML string fragment - */ - function formatSlideNumber( a, delimiter, b ) { - - var url = '#' + locationHash(); - if( typeof b === 'number' && !isNaN( b ) ) { - return '' + - ''+ a +'' + - ''+ delimiter +'' + - ''+ b +'' + - ''; - } - else { - return '' + - ''+ a +'' + - ''; - } - - } - - /** - * Updates the state of all control/navigation arrows. - */ - function updateControls() { - - var routes = availableRoutes(); - var fragments = availableFragments(); - - // Remove the 'enabled' class from all directions - dom.controlsLeft.concat( dom.controlsRight ) - .concat( dom.controlsUp ) - .concat( dom.controlsDown ) - .concat( dom.controlsPrev ) - .concat( dom.controlsNext ).forEach( function( node ) { - node.classList.remove( 'enabled' ); - node.classList.remove( 'fragmented' ); - - // Set 'disabled' attribute on all directions - node.setAttribute( 'disabled', 'disabled' ); - } ); - - // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons - if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); - - // Prev/next buttons - if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); - - // Highlight fragment directions - if( currentSlide ) { - - // Always apply fragment decorator to prev/next buttons - if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); - - // Apply fragment decorators to directional buttons based on - // what slide axis they are in - if( isVerticalSlide( currentSlide ) ) { - if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); - } - else { - if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); - } - - } - - if( config.controlsTutorial ) { - - // Highlight control arrows with an animation to ensure - // that the viewer knows how to navigate - if( !hasNavigatedDown && routes.down ) { - dom.controlsDownArrow.classList.add( 'highlight' ); - } - else { - dom.controlsDownArrow.classList.remove( 'highlight' ); - - if( !hasNavigatedRight && routes.right && indexv === 0 ) { - dom.controlsRightArrow.classList.add( 'highlight' ); - } - else { - dom.controlsRightArrow.classList.remove( 'highlight' ); - } - } - - } - - } - - /** - * Updates the background elements to reflect the current - * slide. - * - * @param {boolean} includeAll If true, the backgrounds of - * all vertical slides (not just the present) will be updated. - */ - function updateBackground( includeAll ) { - - var currentBackground = null; - - // Reverse past/future classes when in RTL mode - var horizontalPast = config.rtl ? 'future' : 'past', - horizontalFuture = config.rtl ? 'past' : 'future'; - - // Update the classes of all backgrounds to match the - // states of their slides (past/present/future) - toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) { - - backgroundh.classList.remove( 'past' ); - backgroundh.classList.remove( 'present' ); - backgroundh.classList.remove( 'future' ); - - if( h < indexh ) { - backgroundh.classList.add( horizontalPast ); - } - else if ( h > indexh ) { - backgroundh.classList.add( horizontalFuture ); - } - else { - backgroundh.classList.add( 'present' ); - - // Store a reference to the current background element - currentBackground = backgroundh; - } - - if( includeAll || h === indexh ) { - toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) { - - backgroundv.classList.remove( 'past' ); - backgroundv.classList.remove( 'present' ); - backgroundv.classList.remove( 'future' ); - - if( v < indexv ) { - backgroundv.classList.add( 'past' ); - } - else if ( v > indexv ) { - backgroundv.classList.add( 'future' ); - } - else { - backgroundv.classList.add( 'present' ); - - // Only if this is the present horizontal and vertical slide - if( h === indexh ) currentBackground = backgroundv; - } - - } ); - } - - } ); - - // Stop content inside of previous backgrounds - if( previousBackground ) { - - stopEmbeddedContent( previousBackground ); - - } - - // Start content in the current background - if( currentBackground ) { - - startEmbeddedContent( currentBackground ); - - var currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' ); - if( currentBackgroundContent ) { - - var backgroundImageURL = currentBackgroundContent.style.backgroundImage || ''; - - // Restart GIFs (doesn't work in Firefox) - if( /\.gif/i.test( backgroundImageURL ) ) { - currentBackgroundContent.style.backgroundImage = ''; - window.getComputedStyle( currentBackgroundContent ).opacity; - currentBackgroundContent.style.backgroundImage = backgroundImageURL; - } - - } - - // Don't transition between identical backgrounds. This - // prevents unwanted flicker. - var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null; - var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' ); - if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) { - dom.background.classList.add( 'no-transition' ); - } - - previousBackground = currentBackground; - - } - - // If there's a background brightness flag for this slide, - // bubble it to the .reveal container - if( currentSlide ) { - [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) { - if( currentSlide.classList.contains( classToBubble ) ) { - dom.wrapper.classList.add( classToBubble ); - } - else { - dom.wrapper.classList.remove( classToBubble ); - } - } ); - } - - // Allow the first background to apply without transition - setTimeout( function() { - dom.background.classList.remove( 'no-transition' ); - }, 1 ); - - } - - /** - * Updates the position of the parallax background based - * on the current slide index. - */ - function updateParallax() { - - if( config.parallaxBackgroundImage ) { - - var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ), - verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR ); - - var backgroundSize = dom.background.style.backgroundSize.split( ' ' ), - backgroundWidth, backgroundHeight; - - if( backgroundSize.length === 1 ) { - backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 ); - } - else { - backgroundWidth = parseInt( backgroundSize[0], 10 ); - backgroundHeight = parseInt( backgroundSize[1], 10 ); - } - - var slideWidth = dom.background.offsetWidth, - horizontalSlideCount = horizontalSlides.length, - horizontalOffsetMultiplier, - horizontalOffset; - - if( typeof config.parallaxBackgroundHorizontal === 'number' ) { - horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal; - } - else { - horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0; - } - - horizontalOffset = horizontalOffsetMultiplier * indexh * -1; - - var slideHeight = dom.background.offsetHeight, - verticalSlideCount = verticalSlides.length, - verticalOffsetMultiplier, - verticalOffset; - - if( typeof config.parallaxBackgroundVertical === 'number' ) { - verticalOffsetMultiplier = config.parallaxBackgroundVertical; - } - else { - verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ); - } - - verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0; - - dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px'; - - } - - } - - /** - * Called when the given slide is within the configured view - * distance. Shows the slide element and loads any content - * that is set to load lazily (data-src). - * - * @param {HTMLElement} slide Slide to show - */ - function loadSlide( slide, options ) { - - options = options || {}; - - // Show the slide element - slide.style.display = config.display; - - // Media elements with data-src attributes - toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) { - element.setAttribute( 'src', element.getAttribute( 'data-src' ) ); - element.setAttribute( 'data-lazy-loaded', '' ); - element.removeAttribute( 'data-src' ); - } ); - - // Media elements with children - toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) { - var sources = 0; - - toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) { - source.setAttribute( 'src', source.getAttribute( 'data-src' ) ); - source.removeAttribute( 'data-src' ); - source.setAttribute( 'data-lazy-loaded', '' ); - sources += 1; - } ); - - // If we rewrote sources for this video/audio element, we need - // to manually tell it to load from its new origin - if( sources > 0 ) { - media.load(); - } - } ); - - - // Show the corresponding background element - var background = slide.slideBackgroundElement; - if( background ) { - background.style.display = 'block'; - - var backgroundContent = slide.slideBackgroundContentElement; - - // If the background contains media, load it - if( background.hasAttribute( 'data-loaded' ) === false ) { - background.setAttribute( 'data-loaded', 'true' ); - - var backgroundImage = slide.getAttribute( 'data-background-image' ), - backgroundVideo = slide.getAttribute( 'data-background-video' ), - backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ), - backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ), - backgroundIframe = slide.getAttribute( 'data-background-iframe' ); - - // Images - if( backgroundImage ) { - backgroundContent.style.backgroundImage = 'url('+ encodeURI( backgroundImage ) +')'; - } - // Videos - else if ( backgroundVideo && !isSpeakerNotes() ) { - var video = document.createElement( 'video' ); - - if( backgroundVideoLoop ) { - video.setAttribute( 'loop', '' ); - } - - if( backgroundVideoMuted ) { - video.muted = true; - } - - // Inline video playback works (at least in Mobile Safari) as - // long as the video is muted and the `playsinline` attribute is - // present - if( isMobileDevice ) { - video.muted = true; - video.autoplay = true; - video.setAttribute( 'playsinline', '' ); - } - - // Support comma separated lists of video sources - backgroundVideo.split( ',' ).forEach( function( source ) { - video.innerHTML += ''; - } ); - - backgroundContent.appendChild( video ); - } - // Iframes - else if( backgroundIframe && options.excludeIframes !== true ) { - var iframe = document.createElement( 'iframe' ); - iframe.setAttribute( 'allowfullscreen', '' ); - iframe.setAttribute( 'mozallowfullscreen', '' ); - iframe.setAttribute( 'webkitallowfullscreen', '' ); - - // Only load autoplaying content when the slide is shown to - // avoid having it play in the background - if( /autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) { - iframe.setAttribute( 'data-src', backgroundIframe ); - } - else { - iframe.setAttribute( 'src', backgroundIframe ); - } - - iframe.style.width = '100%'; - iframe.style.height = '100%'; - iframe.style.maxHeight = '100%'; - iframe.style.maxWidth = '100%'; - - backgroundContent.appendChild( iframe ); - } - } - - } - - } - - /** - * Unloads and hides the given slide. This is called when the - * slide is moved outside of the configured view distance. - * - * @param {HTMLElement} slide - */ - function unloadSlide( slide ) { - - // Hide the slide element - slide.style.display = 'none'; - - // Hide the corresponding background element - var background = getSlideBackground( slide ); - if( background ) { - background.style.display = 'none'; - } - - // Reset lazy-loaded media elements with src attributes - toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src]' ) ).forEach( function( element ) { - element.setAttribute( 'data-src', element.getAttribute( 'src' ) ); - element.removeAttribute( 'src' ); - } ); - - // Reset lazy-loaded media elements with children - toArray( slide.querySelectorAll( 'video[data-lazy-loaded] source[src], audio source[src]' ) ).forEach( function( source ) { - source.setAttribute( 'data-src', source.getAttribute( 'src' ) ); - source.removeAttribute( 'src' ); - } ); - - } - - /** - * Determine what available routes there are for navigation. - * - * @return {{left: boolean, right: boolean, up: boolean, down: boolean}} - */ - function availableRoutes() { - - var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ), - verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR ); - - var routes = { - left: indexh > 0, - right: indexh < horizontalSlides.length - 1, - up: indexv > 0, - down: indexv < verticalSlides.length - 1 - }; - - // Looped presentations can always be navigated as long as - // there are slides available - if( config.loop ) { - if( horizontalSlides.length > 1 ) { - routes.left = true; - routes.right = true; - } - - if( verticalSlides.length > 1 ) { - routes.up = true; - routes.down = true; - } - } - - // Reverse horizontal controls for rtl - if( config.rtl ) { - var left = routes.left; - routes.left = routes.right; - routes.right = left; - } - - return routes; - - } - - /** - * Returns an object describing the available fragment - * directions. - * - * @return {{prev: boolean, next: boolean}} - */ - function availableFragments() { - - if( currentSlide && config.fragments ) { - var fragments = currentSlide.querySelectorAll( '.fragment' ); - var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' ); - - return { - prev: fragments.length - hiddenFragments.length > 0, - next: !!hiddenFragments.length - }; - } - else { - return { prev: false, next: false }; - } - - } - - /** - * Enforces origin-specific format rules for embedded media. - */ - function formatEmbeddedContent() { - - var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) { - toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) { - var src = el.getAttribute( sourceAttribute ); - if( src && src.indexOf( param ) === -1 ) { - el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param ); - } - }); - }; - - // YouTube frames must include "?enablejsapi=1" - _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' ); - _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' ); - - // Vimeo frames must include "?api=1" - _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' ); - _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' ); - - // Always show media controls on mobile devices - if( isMobileDevice ) { - toArray( dom.slides.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { - el.controls = true; - } ); - } - - } - - /** - * Start playback of any embedded content inside of - * the given element. - * - * @param {HTMLElement} element - */ - function startEmbeddedContent( element ) { - - if( element && !isSpeakerNotes() ) { - - // Restart GIFs - toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) { - // Setting the same unchanged source like this was confirmed - // to work in Chrome, FF & Safari - el.setAttribute( 'src', el.getAttribute( 'src' ) ); - } ); - - // HTML5 media elements - toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { - if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) { - return; - } - - // Prefer an explicit global autoplay setting - var autoplay = config.autoPlayMedia; - - // If no global setting is available, fall back on the element's - // own autoplay setting - if( typeof autoplay !== 'boolean' ) { - autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' ); - } - - if( autoplay && typeof el.play === 'function' ) { - - // If the media is ready, start playback - if( el.readyState > 1 ) { - startEmbeddedMedia( { target: el } ); - } - // Mobile devices never fire a loaded event so instead - // of waiting, we initiate playback - else if( isMobileDevice ) { - el.play(); - } - // If the media isn't loaded, wait before playing - else { - el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes - el.addEventListener( 'loadeddata', startEmbeddedMedia ); - } - - } - } ); - - // Normal iframes - toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) { - if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) { - return; - } - - startEmbeddedIframe( { target: el } ); - } ); - - // Lazy loading iframes - toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) { - if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) { - return; - } - - if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) { - el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes - el.addEventListener( 'load', startEmbeddedIframe ); - el.setAttribute( 'src', el.getAttribute( 'data-src' ) ); - } - } ); - - } - - } - - /** - * Starts playing an embedded video/audio element after - * it has finished loading. - * - * @param {object} event - */ - function startEmbeddedMedia( event ) { - - var isAttachedToDOM = !!closestParent( event.target, 'html' ), - isVisible = !!closestParent( event.target, '.present' ); - - if( isAttachedToDOM && isVisible ) { - event.target.currentTime = 0; - event.target.play(); - } - - event.target.removeEventListener( 'loadeddata', startEmbeddedMedia ); - - } - - /** - * "Starts" the content of an embedded iframe using the - * postMessage API. - * - * @param {object} event - */ - function startEmbeddedIframe( event ) { - - var iframe = event.target; - - if( iframe && iframe.contentWindow ) { - - var isAttachedToDOM = !!closestParent( event.target, 'html' ), - isVisible = !!closestParent( event.target, '.present' ); - - if( isAttachedToDOM && isVisible ) { - - // Prefer an explicit global autoplay setting - var autoplay = config.autoPlayMedia; - - // If no global setting is available, fall back on the element's - // own autoplay setting - if( typeof autoplay !== 'boolean' ) { - autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' ); - } - - // YouTube postMessage API - if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) { - iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' ); - } - // Vimeo postMessage API - else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) { - iframe.contentWindow.postMessage( '{"method":"play"}', '*' ); - } - // Generic postMessage API - else { - iframe.contentWindow.postMessage( 'slide:start', '*' ); - } - - } - - } - - } - - /** - * Stop playback of any embedded content inside of - * the targeted slide. - * - * @param {HTMLElement} element - */ - function stopEmbeddedContent( element, options ) { - - options = extend( { - // Defaults - unloadIframes: true - }, options || {} ); - - if( element && element.parentNode ) { - // HTML5 media elements - toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { - if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) { - el.setAttribute('data-paused-by-reveal', ''); - el.pause(); - } - } ); - - // Generic postMessage API for non-lazy loaded iframes - toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) { - if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' ); - el.removeEventListener( 'load', startEmbeddedIframe ); - }); - - // YouTube postMessage API - toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) { - if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) { - el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' ); - } - }); - - // Vimeo postMessage API - toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) { - if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) { - el.contentWindow.postMessage( '{"method":"pause"}', '*' ); - } - }); - - if( options.unloadIframes === true ) { - // Unload lazy-loaded iframes - toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) { - // Only removing the src doesn't actually unload the frame - // in all browsers (Firefox) so we set it to blank first - el.setAttribute( 'src', 'about:blank' ); - el.removeAttribute( 'src' ); - } ); - } - } - - } - - /** - * Returns the number of past slides. This can be used as a global - * flattened index for slides. - * - * @return {number} Past slide count - */ - function getSlidePastCount() { - - var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); - - // The number of past slides - var pastCount = 0; - - // Step through all slides and count the past ones - mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) { - - var horizontalSlide = horizontalSlides[i]; - var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); - - for( var j = 0; j < verticalSlides.length; j++ ) { - - // Stop as soon as we arrive at the present - if( verticalSlides[j].classList.contains( 'present' ) ) { - break mainLoop; - } - - pastCount++; - - } - - // Stop as soon as we arrive at the present - if( horizontalSlide.classList.contains( 'present' ) ) { - break; - } - - // Don't count the wrapping section for vertical slides - if( horizontalSlide.classList.contains( 'stack' ) === false ) { - pastCount++; - } - - } - - return pastCount; - - } - - /** - * Returns a value ranging from 0-1 that represents - * how far into the presentation we have navigated. - * - * @return {number} - */ - function getProgress() { - - // The number of past and total slides - var totalCount = getTotalSlides(); - var pastCount = getSlidePastCount(); - - if( currentSlide ) { - - var allFragments = currentSlide.querySelectorAll( '.fragment' ); - - // If there are fragments in the current slide those should be - // accounted for in the progress. - if( allFragments.length > 0 ) { - var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' ); - - // This value represents how big a portion of the slide progress - // that is made up by its fragments (0-1) - var fragmentWeight = 0.9; - - // Add fragment progress to the past slide count - pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight; - } - - } - - return pastCount / ( totalCount - 1 ); - - } - - /** - * Checks if this presentation is running inside of the - * speaker notes window. - * - * @return {boolean} - */ - function isSpeakerNotes() { - - return !!window.location.search.match( /receiver/gi ); - - } - - /** - * Reads the current URL (hash) and navigates accordingly. - */ - function readURL() { - - var hash = window.location.hash; - - // Attempt to parse the hash as either an index or name - var bits = hash.slice( 2 ).split( '/' ), - name = hash.replace( /#|\//gi, '' ); - - // If the first bit is not fully numeric and there is a name we - // can assume that this is a named link - if( !/^[0-9]*$/.test( bits[0] ) && name.length ) { - var element; - - // Ensure the named link is a valid HTML ID attribute - try { - element = document.getElementById( decodeURIComponent( name ) ); - } - catch ( error ) { } - - // Ensure that we're not already on a slide with the same name - var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false; - - if( element && !isSameNameAsCurrentSlide ) { - // Find the position of the named slide and navigate to it - var indices = Reveal.getIndices( element ); - slide( indices.h, indices.v ); - } - // If the slide doesn't exist, navigate to the current slide - else { - slide( indexh || 0, indexv || 0 ); - } - } - else { - var hashIndexBase = config.hashOneBasedIndex ? 1 : 0; - - // Read the index components of the hash - var h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0, - v = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0, - f; - - if( config.fragmentInURL ) { - f = parseInt( bits[2], 10 ); - if( isNaN( f ) ) { - f = undefined; - } - } - - if( h !== indexh || v !== indexv || f !== undefined ) { - slide( h, v, f ); - } - } - - } - - /** - * Updates the page URL (hash) to reflect the current - * state. - * - * @param {number} delay The time in ms to wait before - * writing the hash - */ - function writeURL( delay ) { - - if( config.history ) { - - // Make sure there's never more than one timeout running - clearTimeout( writeURLTimeout ); - - // If a delay is specified, timeout this call - if( typeof delay === 'number' ) { - writeURLTimeout = setTimeout( writeURL, delay ); - } - else if( currentSlide ) { - window.location.hash = locationHash(); - } - } - - } - /** - * Retrieves the h/v location and fragment of the current, - * or specified, slide. - * - * @param {HTMLElement} [slide] If specified, the returned - * index will be for this slide rather than the currently - * active one - * - * @return {{h: number, v: number, f: number}} - */ - function getIndices( slide ) { - - // By default, return the current indices - var h = indexh, - v = indexv, - f; - - // If a slide is specified, return the indices of that slide - if( slide ) { - var isVertical = isVerticalSlide( slide ); - var slideh = isVertical ? slide.parentNode : slide; - - // Select all horizontal slides - var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); - - // Now that we know which the horizontal slide is, get its index - h = Math.max( horizontalSlides.indexOf( slideh ), 0 ); - - // Assume we're not vertical - v = undefined; - - // If this is a vertical slide, grab the vertical index - if( isVertical ) { - v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 ); - } - } - - if( !slide && currentSlide ) { - var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0; - if( hasFragments ) { - var currentFragment = currentSlide.querySelector( '.current-fragment' ); - if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) { - f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 ); - } - else { - f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1; - } - } - } - - return { h: h, v: v, f: f }; - - } - - /** - * Retrieves all slides in this presentation. - */ - function getSlides() { - - return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' )); - - } - - /** - * Retrieves the total number of slides in this presentation. - * - * @return {number} - */ - function getTotalSlides() { - - return getSlides().length; - - } - - /** - * Returns the slide element matching the specified index. - * - * @return {HTMLElement} - */ - function getSlide( x, y ) { - - var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ]; - var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' ); - - if( verticalSlides && verticalSlides.length && typeof y === 'number' ) { - return verticalSlides ? verticalSlides[ y ] : undefined; - } - - return horizontalSlide; - - } - - /** - * Returns the background element for the given slide. - * All slides, even the ones with no background properties - * defined, have a background element so as long as the - * index is valid an element will be returned. - * - * @param {mixed} x Horizontal background index OR a slide - * HTML element - * @param {number} y Vertical background index - * @return {(HTMLElement[]|*)} - */ - function getSlideBackground( x, y ) { - - var slide = typeof x === 'number' ? getSlide( x, y ) : x; - if( slide ) { - return slide.slideBackgroundElement; - } - - return undefined; - - } - - /** - * Retrieves the speaker notes from a slide. Notes can be - * defined in two ways: - * 1. As a data-notes attribute on the slide
- * 2. As an