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Diffstat (limited to 'js/reveal.js')
| -rw-r--r-- | js/reveal.js | 10795 |
1 files changed, 5428 insertions, 5367 deletions
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', '<span></span>' ); - dom.progressbar = dom.progress.querySelector( 'span' ); - - // Arrow controls - dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls', - '<button class="navigate-left" aria-label="previous slide"><div class="controls-arrow"></div></button>' + - '<button class="navigate-right" aria-label="next slide"><div class="controls-arrow"></div></button>' + - '<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>' + - '<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></button>' ); - - // 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', '<button class="resume-button">Resume presentation</button>' ); - 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', '<span></span>'); + dom.progressbar = dom.progress.querySelector('span'); + + // Arrow controls + dom.controls = createSingletonNode(dom.wrapper, 'aside', 'controls', + '<button class="navigate-left" aria-label="previous slide"><div class="controls-arrow"></div></button>' + + '<button class="navigate-right" aria-label="next slide"><div class="controls-arrow"></div></button>' + + '<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>' + + '<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></button>'); + + // 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', '<button class="resume-button">Resume presentation</button>'); + 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 = [ + '<header>', + '<a class="close" href="#"><span class="icon"></span></a>', + '<a class="external" href="' + url + '" target="_blank"><span class="icon"></span></a>', + '</header>', + '<div class="spinner"></div>', + '<div class="viewport">', + '<iframe src="' + url + '"></iframe>', + '<small class="viewport-inner">', + '<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>', + '</small>', + '</div>' + ].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 = '<p class="title">Keyboard Shortcuts</p><br/>'; + + html += '<table><th>KEY</th><th>ACTION</th>'; + for (var key in keyboardShortcuts) { + html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[key] + '</td></tr>'; + } + + // Add custom key bindings that have associated descriptions + for (var binding in registeredKeyBindings) { + if (registeredKeyBindings[binding].key && registeredKeyBindings[binding].description) { + html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</td></tr>'; + } + } + + html += '</table>'; + + dom.overlay.innerHTML = [ + '<header>', + '<a class="close" href="#"><span class="icon"></span></a>', + '</header>', + '<div class="viewport">', + '<div class="viewport-inner">' + html + '</div>', + '</div>' + ].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 = [ - '<header>', - '<a class="close" href="#"><span class="icon"></span></a>', - '<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>', - '</header>', - '<div class="spinner"></div>', - '<div class="viewport">', - '<iframe src="'+ url +'"></iframe>', - '<small class="viewport-inner">', - '<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>', - '</small>', - '</div>' - ].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 = '<p class="title">Keyboard Shortcuts</p><br/>'; - - html += '<table><th>KEY</th><th>ACTION</th>'; - for( var key in keyboardShortcuts ) { - html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>'; - } - - // Add custom key bindings that have associated descriptions - for( var binding in registeredKeyBindings ) { - if( registeredKeyBindings[binding].key && registeredKeyBindings[binding].description ) { - html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</td></tr>'; - } - } - - html += '</table>'; - - dom.overlay.innerHTML = [ - '<header>', - '<a class="close" href="#"><span class="icon"></span></a>', - '</header>', - '<div class="viewport">', - '<div class="viewport-inner">'+ html +'</div>', - '</div>' - ].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() || '<span class="notes-placeholder">No notes on this slide.</span>'; - - } - - } - - /** - * 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 href="' + url + '">' + - '<span class="slide-number-a">'+ a +'</span>' + - '<span class="slide-number-delimiter">'+ delimiter +'</span>' + - '<span class="slide-number-b">'+ b +'</span>' + - '</a>'; - } - else { - return '<a href="' + url + '">' + - '<span class="slide-number-a">'+ a +'</span>' + - '</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 <source> 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 += '<source src="'+ source +'">'; - } ); - - 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 <source> 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 <section> - * 2. As an <aside class="notes"> inside of the slide - * - * @param {HTMLElement} [slide=currentSlide] - * @return {(string|null)} - */ - function getSlideNotes( slide ) { - - // Default to the current slide - slide = slide || currentSlide; - - // Notes can be specified via the data-notes attribute... - if( slide.hasAttribute( 'data-notes' ) ) { - return slide.getAttribute( 'data-notes' ); - } - - // ... or using an <aside class="notes"> element - var notesElement = slide.querySelector( 'aside.notes' ); - if( notesElement ) { - return notesElement.innerHTML; - } - - return null; - - } - - /** - * Retrieves the current state of the presentation as - * an object. This state can then be restored at any - * time. - * - * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}} - */ - function getState() { - - var indices = getIndices(); - - return { - indexh: indices.h, - indexv: indices.v, - indexf: indices.f, - paused: isPaused(), - overview: isOverview() - }; - - } - - /** - * Restores the presentation to the given state. - * - * @param {object} state As generated by getState() - * @see {@link getState} generates the parameter `state` - */ - function setState( state ) { - - if( typeof state === 'object' ) { - slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) ); - - var pausedFlag = deserialize( state.paused ), - overviewFlag = deserialize( state.overview ); - - if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) { - togglePause( pausedFlag ); - } - - if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) { - toggleOverview( overviewFlag ); - } - } - - } - - /** - * Return a sorted fragments list, ordered by an increasing - * "data-fragment-index" attribute. - * - * Fragments will be revealed in the order that they are returned by - * this function, so you can use the index attributes to control the - * order of fragment appearance. - * - * To maintain a sensible default fragment order, fragments are presumed - * to be passed in document order. This function adds a "fragment-index" - * attribute to each node if such an attribute is not already present, - * and sets that attribute to an integer value which is the position of - * the fragment within the fragments list. - * - * @param {object[]|*} fragments - * @param {boolean} grouped If true the returned array will contain - * nested arrays for all fragments with the same index - * @return {object[]} sorted Sorted array of fragments - */ - function sortFragments( fragments, grouped ) { - - fragments = toArray( fragments ); - - var ordered = [], - unordered = [], - sorted = []; - - // Group ordered and unordered elements - fragments.forEach( function( fragment, i ) { - if( fragment.hasAttribute( 'data-fragment-index' ) ) { - var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 ); - - if( !ordered[index] ) { - ordered[index] = []; - } - - ordered[index].push( fragment ); - } - else { - unordered.push( [ fragment ] ); - } - } ); - - // Append fragments without explicit indices in their - // DOM order - ordered = ordered.concat( unordered ); - - // Manually count the index up per group to ensure there - // are no gaps - var index = 0; - - // Push all fragments in their sorted order to an array, - // this flattens the groups - ordered.forEach( function( group ) { - group.forEach( function( fragment ) { - sorted.push( fragment ); - fragment.setAttribute( 'data-fragment-index', index ); - } ); - - index ++; - } ); - - return grouped === true ? ordered : sorted; - - } - - /** - * Navigate to the specified slide fragment. - * - * @param {?number} index The index of the fragment that - * should be shown, -1 means all are invisible - * @param {number} offset Integer offset to apply to the - * fragment index - * - * @return {boolean} true if a change was made in any - * fragments visibility as part of this call - */ - function navigateFragment( index, offset ) { - - if( currentSlide && config.fragments ) { - - var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) ); - if( fragments.length ) { - - // If no index is specified, find the current - if( typeof index !== 'number' ) { - var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop(); - - if( lastVisibleFragment ) { - index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 ); - } - else { - index = -1; - } - } - - // If an offset is specified, apply it to the index - if( typeof offset === 'number' ) { - index += offset; - } - - var fragmentsShown = [], - fragmentsHidden = []; - - toArray( fragments ).forEach( function( element, i ) { - - if( element.hasAttribute( 'data-fragment-index' ) ) { - i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 ); - } - - // Visible fragments - if( i <= index ) { - if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element ); - element.classList.add( 'visible' ); - element.classList.remove( 'current-fragment' ); - - // Announce the fragments one by one to the Screen Reader - dom.statusDiv.textContent = getStatusText( element ); - - if( i === index ) { - element.classList.add( 'current-fragment' ); - startEmbeddedContent( element ); - } - } - // Hidden fragments - else { - if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element ); - element.classList.remove( 'visible' ); - element.classList.remove( 'current-fragment' ); - } - - } ); - - if( fragmentsHidden.length ) { - dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } ); - } - - if( fragmentsShown.length ) { - dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } ); - } - - updateControls(); - updateProgress(); - if( config.fragmentInURL ) { - writeURL(); - } - - return !!( fragmentsShown.length || fragmentsHidden.length ); - - } - - } - - return false; - - } - - /** - * Navigate to the next slide fragment. - * - * @return {boolean} true if there was a next fragment, - * false otherwise - */ - function nextFragment() { - - return navigateFragment( null, 1 ); - - } - - /** - * Navigate to the previous slide fragment. - * - * @return {boolean} true if there was a previous fragment, - * false otherwise - */ - function previousFragment() { - - return navigateFragment( null, -1 ); - - } - - /** - * Cues a new automated slide if enabled in the config. - */ - function cueAutoSlide() { - - cancelAutoSlide(); - - if( currentSlide && config.autoSlide !== false ) { - - var fragment = currentSlide.querySelector( '.current-fragment' ); - - // When the slide first appears there is no "current" fragment so - // we look for a data-autoslide timing on the first fragment - if( !fragment ) fragment = currentSlide.querySelector( '.fragment' ); - - var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null; - var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null; - var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' ); - - // Pick value in the following priority order: - // 1. Current fragment's data-autoslide - // 2. Current slide's data-autoslide - // 3. Parent slide's data-autoslide - // 4. Global autoSlide setting - if( fragmentAutoSlide ) { - autoSlide = parseInt( fragmentAutoSlide, 10 ); - } - else if( slideAutoSlide ) { - autoSlide = parseInt( slideAutoSlide, 10 ); - } - else if( parentAutoSlide ) { - autoSlide = parseInt( parentAutoSlide, 10 ); - } - else { - autoSlide = config.autoSlide; - } - - // If there are media elements with data-autoplay, - // automatically set the autoSlide duration to the - // length of that media. Not applicable if the slide - // is divided up into fragments. - // playbackRate is accounted for in the duration. - if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) { - toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { - if( el.hasAttribute( 'data-autoplay' ) ) { - if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) { - autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000; - } - } - } ); - } - - // Cue the next auto-slide if: - // - There is an autoSlide value - // - Auto-sliding isn't paused by the user - // - The presentation isn't paused - // - The overview isn't active - // - The presentation isn't over - if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) { - autoSlideTimeout = setTimeout( function() { - typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext(); - cueAutoSlide(); - }, autoSlide ); - autoSlideStartTime = Date.now(); - } - - if( autoSlidePlayer ) { - autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 ); - } - - } - - } - - /** - * Cancels any ongoing request to auto-slide. - */ - function cancelAutoSlide() { - - clearTimeout( autoSlideTimeout ); - autoSlideTimeout = -1; - - } - - function pauseAutoSlide() { - - if( autoSlide && !autoSlidePaused ) { - autoSlidePaused = true; - dispatchEvent( 'autoslidepaused' ); - clearTimeout( autoSlideTimeout ); - - if( autoSlidePlayer ) { - autoSlidePlayer.setPlaying( false ); - } - } - - } - - function resumeAutoSlide() { - - if( autoSlide && autoSlidePaused ) { - autoSlidePaused = false; - dispatchEvent( 'autoslideresumed' ); - cueAutoSlide(); - } - - } - - function navigateLeft() { - - // Reverse for RTL - if( config.rtl ) { - if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) { - slide( indexh + 1 ); - } - } - // Normal navigation - else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) { - slide( indexh - 1 ); - } - - } - - function navigateRight() { - - hasNavigatedRight = true; - - // Reverse for RTL - if( config.rtl ) { - if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) { - slide( indexh - 1 ); - } - } - // Normal navigation - else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) { - slide( indexh + 1 ); - } - - } - - function navigateUp() { - - // Prioritize hiding fragments - if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) { - slide( indexh, indexv - 1 ); - } - - } - - function navigateDown() { - - hasNavigatedDown = true; - - // Prioritize revealing fragments - if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) { - slide( indexh, indexv + 1 ); - } - - } - - /** - * Navigates backwards, prioritized in the following order: - * 1) Previous fragment - * 2) Previous vertical slide - * 3) Previous horizontal slide - */ - function navigatePrev() { - - // Prioritize revealing fragments - if( previousFragment() === false ) { - if( availableRoutes().up ) { - navigateUp(); - } - else { - // Fetch the previous horizontal slide, if there is one - var previousSlide; - - if( config.rtl ) { - previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop(); - } - else { - previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop(); - } - - if( previousSlide ) { - var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined; - var h = indexh - 1; - slide( h, v ); - } - } - } - - } - - /** - * The reverse of #navigatePrev(). - */ - function navigateNext() { - - hasNavigatedRight = true; - hasNavigatedDown = true; - - // Prioritize revealing fragments - if( nextFragment() === false ) { - - var routes = availableRoutes(); - - // When looping is enabled `routes.down` is always available - // so we need a separate check for when we've reached the - // end of a stack and should move horizontally - if( routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide( currentSlide ) ) { - routes.down = false; - } - - if( routes.down ) { - navigateDown(); - } - else if( config.rtl ) { - navigateLeft(); - } - else { - navigateRight(); - } - } - - } - - /** - * Checks if the target element prevents the triggering of - * swipe navigation. - */ - function isSwipePrevented( target ) { - - while( target && typeof target.hasAttribute === 'function' ) { - if( target.hasAttribute( 'data-prevent-swipe' ) ) return true; - target = target.parentNode; - } - - return false; - - } - - - // --------------------------------------------------------------------// - // ----------------------------- EVENTS -------------------------------// - // --------------------------------------------------------------------// - - /** - * Called by all event handlers that are based on user - * input. - * - * @param {object} [event] - */ - function onUserInput( event ) { - - if( config.autoSlideStoppable ) { - pauseAutoSlide(); - } - - } - - /** - * Handler for the document level 'keypress' event. - * - * @param {object} event - */ - function onDocumentKeyPress( event ) { - - // Check if the pressed key is question mark - if( event.shiftKey && event.charCode === 63 ) { - toggleHelp(); - } - - } - - /** - * Handler for the document level 'keydown' event. - * - * @param {object} event - */ - function onDocumentKeyDown( event ) { - - // If there's a condition specified and it returns false, - // ignore this event - if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) { - return true; - } - - // Remember if auto-sliding was paused so we can toggle it - var autoSlideWasPaused = autoSlidePaused; - - onUserInput( event ); - - // Check if there's a focused element that could be using - // the keyboard - var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit'; - var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName ); - var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className); - - // Disregard the event if there's a focused element or a - // keyboard modifier key is present - if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return; - - // While paused only allow resume keyboard events; 'b', 'v', '.' - var resumeKeyCodes = [66,86,190,191]; - var key; - - // Custom key bindings for togglePause should be able to resume - if( typeof config.keyboard === 'object' ) { - for( key in config.keyboard ) { - if( config.keyboard[key] === 'togglePause' ) { - resumeKeyCodes.push( parseInt( key, 10 ) ); - } - } - } - - if( isPaused() && resumeKeyCodes.indexOf( event.keyCode ) === -1 ) { - return false; - } - - var triggered = false; - - // 1. User defined key bindings - if( typeof config.keyboard === 'object' ) { - - for( key in config.keyboard ) { - - // Check if this binding matches the pressed key - if( parseInt( key, 10 ) === event.keyCode ) { - - var value = config.keyboard[ key ]; - - // Callback function - if( typeof value === 'function' ) { - value.apply( null, [ event ] ); - } - // String shortcuts to reveal.js API - else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) { - Reveal[ value ].call(); - } - - triggered = true; - - } - - } - - } - - // 2. Registered custom key bindings - if( triggered === false ) { - - for( key in registeredKeyBindings ) { - - // Check if this binding matches the pressed key - if( parseInt( key, 10 ) === event.keyCode ) { - - var action = registeredKeyBindings[ key ].callback; - - // Callback function - if( typeof action === 'function' ) { - action.apply( null, [ event ] ); - } - // String shortcuts to reveal.js API - else if( typeof action === 'string' && typeof Reveal[ action ] === 'function' ) { - Reveal[ action ].call(); - } - - triggered = true; - } - } - } - - // 3. System defined key bindings - if( triggered === false ) { - - // Assume true and try to prove false - triggered = true; - - switch( event.keyCode ) { - // p, page up - case 80: case 33: navigatePrev(); break; - // n, page down - case 78: case 34: navigateNext(); break; - // h, left - case 72: case 37: navigateLeft(); break; - // l, right - case 76: case 39: navigateRight(); break; - // k, up - case 75: case 38: navigateUp(); break; - // j, down - case 74: case 40: navigateDown(); break; - // home - case 36: slide( 0 ); break; - // end - case 35: slide( Number.MAX_VALUE ); break; - // space - case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break; - // return - case 13: isOverview() ? deactivateOverview() : triggered = false; break; - // two-spot, semicolon, b, v, period, Logitech presenter tools "black screen" button - case 58: case 59: case 66: case 86: case 190: case 191: togglePause(); break; - // f - case 70: enterFullscreen(); break; - // a - case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break; - default: - triggered = false; - } - - } - - // If the input resulted in a triggered action we should prevent - // the browsers default behavior - if( triggered ) { - event.preventDefault && event.preventDefault(); - } - // ESC or O key - else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) { - if( dom.overlay ) { - closeOverlay(); - } - else { - toggleOverview(); - } - - event.preventDefault && event.preventDefault(); - } - - // If auto-sliding is enabled we need to cue up - // another timeout - cueAutoSlide(); - - } - - /** - * Handler for the 'touchstart' event, enables support for - * swipe and pinch gestures. - * - * @param {object} event - */ - function onTouchStart( event ) { - - if( isSwipePrevented( event.target ) ) return true; - - touch.startX = event.touches[0].clientX; - touch.startY = event.touches[0].clientY; - touch.startCount = event.touches.length; - - // If there's two touches we need to memorize the distance - // between those two points to detect pinching - if( event.touches.length === 2 && config.overview ) { - touch.startSpan = distanceBetween( { - x: event.touches[1].clientX, - y: event.touches[1].clientY - }, { - x: touch.startX, - y: touch.startY - } ); - } - - } - - /** - * Handler for the 'touchmove' event. - * - * @param {object} event - */ - function onTouchMove( event ) { - - if( isSwipePrevented( event.target ) ) return true; - - // Each touch should only trigger one action - if( !touch.captured ) { - onUserInput( event ); - - var currentX = event.touches[0].clientX; - var currentY = event.touches[0].clientY; - - // If the touch started with two points and still has - // two active touches; test for the pinch gesture - if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) { - - // The current distance in pixels between the two touch points - var currentSpan = distanceBetween( { - x: event.touches[1].clientX, - y: event.touches[1].clientY - }, { - x: touch.startX, - y: touch.startY - } ); - - // If the span is larger than the desire amount we've got - // ourselves a pinch - if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) { - touch.captured = true; - - if( currentSpan < touch.startSpan ) { - activateOverview(); - } - else { - deactivateOverview(); - } - } - - event.preventDefault(); - - } - // There was only one touch point, look for a swipe - else if( event.touches.length === 1 && touch.startCount !== 2 ) { - - var deltaX = currentX - touch.startX, - deltaY = currentY - touch.startY; - - if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) { - touch.captured = true; - navigateLeft(); - } - else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) { - touch.captured = true; - navigateRight(); - } - else if( deltaY > touch.threshold ) { - touch.captured = true; - navigateUp(); - } - else if( deltaY < -touch.threshold ) { - touch.captured = true; - navigateDown(); - } - - // If we're embedded, only block touch events if they have - // triggered an action - if( config.embedded ) { - if( touch.captured || isVerticalSlide( currentSlide ) ) { - event.preventDefault(); - } - } - // Not embedded? Block them all to avoid needless tossing - // around of the viewport in iOS - else { - event.preventDefault(); - } - - } - } - // There's a bug with swiping on some Android devices unless - // the default action is always prevented - else if( UA.match( /android/gi ) ) { - event.preventDefault(); - } - - } - - /** - * Handler for the 'touchend' event. - * - * @param {object} event - */ - function onTouchEnd( event ) { - - touch.captured = false; - - } - - /** - * Convert pointer down to touch start. - * - * @param {object} event - */ - function onPointerDown( event ) { - - if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) { - event.touches = [{ clientX: event.clientX, clientY: event.clientY }]; - onTouchStart( event ); - } - - } - - /** - * Convert pointer move to touch move. - * - * @param {object} event - */ - function onPointerMove( event ) { - - if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) { - event.touches = [{ clientX: event.clientX, clientY: event.clientY }]; - onTouchMove( event ); - } - - } - - /** - * Convert pointer up to touch end. - * - * @param {object} event - */ - function onPointerUp( event ) { - - if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) { - event.touches = [{ clientX: event.clientX, clientY: event.clientY }]; - onTouchEnd( event ); - } - - } - - /** - * Handles mouse wheel scrolling, throttled to avoid skipping - * multiple slides. - * - * @param {object} event - */ - function onDocumentMouseScroll( event ) { - - if( Date.now() - lastMouseWheelStep > 600 ) { - - lastMouseWheelStep = Date.now(); - - var delta = event.detail || -event.wheelDelta; - if( delta > 0 ) { - navigateNext(); - } - else if( delta < 0 ) { - navigatePrev(); - } - - } - - } - - /** - * Clicking on the progress bar results in a navigation to the - * closest approximate horizontal slide using this equation: - * - * ( clickX / presentationWidth ) * numberOfSlides - * - * @param {object} event - */ - function onProgressClicked( event ) { - - onUserInput( event ); - - event.preventDefault(); - - var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length; - var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal ); - - if( config.rtl ) { - slideIndex = slidesTotal - slideIndex; - } - - slide( slideIndex ); - - } - - /** - * Event handler for navigation control buttons. - */ - function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); } - function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); } - function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); } - function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); } - function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); } - function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); } - - /** - * Handler for the window level 'hashchange' event. - * - * @param {object} [event] - */ - function onWindowHashChange( event ) { - - readURL(); - - } - - /** - * Handler for the window level 'resize' event. - * - * @param {object} [event] - */ - function onWindowResize( event ) { - - layout(); - - } - - /** - * Handle for the window level 'visibilitychange' event. - * - * @param {object} [event] - */ - function onPageVisibilityChange( event ) { - - var isHidden = document.webkitHidden || - document.msHidden || - document.hidden; - - // If, after clicking a link or similar and we're coming back, - // focus the document.body to ensure we can use keyboard shortcuts - if( isHidden === false && document.activeElement !== document.body ) { - // Not all elements support .blur() - SVGs among them. - if( typeof document.activeElement.blur === 'function' ) { - document.activeElement.blur(); - } - document.body.focus(); - } - - } - - /** - * Invoked when a slide is and we're in the overview. - * - * @param {object} event - */ - function onOverviewSlideClicked( event ) { - - // TODO There's a bug here where the event listeners are not - // removed after deactivating the overview. - if( eventsAreBound && isOverview() ) { - event.preventDefault(); - - var element = event.target; - - while( element && !element.nodeName.match( /section/gi ) ) { - element = element.parentNode; - } - - if( element && !element.classList.contains( 'disabled' ) ) { - - deactivateOverview(); - - if( element.nodeName.match( /section/gi ) ) { - var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ), - v = parseInt( element.getAttribute( 'data-index-v' ), 10 ); - - slide( h, v ); - } - - } - } - - } - - /** - * Handles clicks on links that are set to preview in the - * iframe overlay. - * - * @param {object} event - */ - function onPreviewLinkClicked( event ) { - - if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) { - var url = event.currentTarget.getAttribute( 'href' ); - if( url ) { - showPreview( url ); - event.preventDefault(); - } - } - - } - - /** - * Handles click on the auto-sliding controls element. - * - * @param {object} [event] - */ - function onAutoSlidePlayerClick( event ) { - - // Replay - if( Reveal.isLastSlide() && config.loop === false ) { - slide( 0, 0 ); - resumeAutoSlide(); - } - // Resume - else if( autoSlidePaused ) { - resumeAutoSlide(); - } - // Pause - else { - pauseAutoSlide(); - } - - } - - - // --------------------------------------------------------------------// - // ------------------------ PLAYBACK COMPONENT ------------------------// - // --------------------------------------------------------------------// - - - /** - * Constructor for the playback component, which displays - * play/pause/progress controls. - * - * @param {HTMLElement} container The component will append - * itself to this - * @param {function} progressCheck A method which will be - * called frequently to get the current progress on a range - * of 0-1 - */ - function Playback( container, progressCheck ) { - - // Cosmetics - this.diameter = 100; - this.diameter2 = this.diameter/2; - this.thickness = 6; + // Select all slides and convert the NodeList result to + // an array + var slides = toArray(dom.wrapper.querySelectorAll(selector)), + slidesLength = slides.length; - // Flags if we are currently playing - this.playing = false; - - // Current progress on a 0-1 range - this.progress = 0; - - // Used to loop the animation smoothly - this.progressOffset = 1; + var printMode = isPrintingPDF(); + + if (slidesLength) { + + // Should the index loop? + if (config.loop) { + index %= slidesLength; - this.container = container; - this.progressCheck = progressCheck; - - this.canvas = document.createElement( 'canvas' ); - this.canvas.className = 'playback'; - this.canvas.width = this.diameter; - this.canvas.height = this.diameter; - this.canvas.style.width = this.diameter2 + 'px'; - this.canvas.style.height = this.diameter2 + 'px'; - this.context = this.canvas.getContext( '2d' ); - - this.container.appendChild( this.canvas ); - - this.render(); - - } - - /** - * @param value - */ - Playback.prototype.setPlaying = function( value ) { - - var wasPlaying = this.playing; - - this.playing = value; - - // Start repainting if we weren't already - if( !wasPlaying && this.playing ) { - this.animate(); - } - else { - this.render(); - } - - }; - - Playback.prototype.animate = function() { - - var progressBefore = this.progress; - - this.progress = this.progressCheck(); - - // When we loop, offset the progress so that it eases - // smoothly rather than immediately resetting - if( progressBefore > 0.8 && this.progress < 0.2 ) { - this.progressOffset = this.progress; - } + if (index < 0) { + index = slidesLength + index; + } + } - this.render(); + // 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'); - if( this.playing ) { - features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) ); - } + // 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'); + } - }; + // 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() || '<span class="notes-placeholder">No notes on this slide.</span>'; + + } + + } + + /** + * 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 href="' + url + '">' + + '<span class="slide-number-a">' + a + '</span>' + + '<span class="slide-number-delimiter">' + delimiter + '</span>' + + '<span class="slide-number-b">' + b + '</span>' + + '</a>'; + } else { + return '<a href="' + url + '">' + + '<span class="slide-number-a">' + a + '</span>' + + '</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; + } - /** - * Renders the current progress and playback state. - */ - Playback.prototype.render = function() { + } + + // 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; - var progress = this.playing ? this.progress : 0, - radius = ( this.diameter2 ) - this.thickness, - x = this.diameter2, - y = this.diameter2, - iconSize = 28; + } - // Ease towards 1 - this.progressOffset += ( 1 - this.progressOffset ) * 0.1; + // 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); + } + }); + } - var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) ); - var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) ); + // Allow the first background to apply without transition + setTimeout(function () { + dom.background.classList.remove('no-transition'); + }, 1); + + } - this.context.save(); - this.context.clearRect( 0, 0, this.diameter, this.diameter ); - - // Solid background color - this.context.beginPath(); - this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false ); - this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )'; - this.context.fill(); + /** + * 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 <source> 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 += '<source src="' + source + '">'; + }); + + 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 <source> 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 <section> + * 2. As an <aside class="notes"> inside of the slide + * + * @param {HTMLElement} [slide=currentSlide] + * @return {(string|null)} + */ + function getSlideNotes(slide) { + + // Default to the current slide + slide = slide || currentSlide; + + // Notes can be specified via the data-notes attribute... + if (slide.hasAttribute('data-notes')) { + return slide.getAttribute('data-notes'); + } + + // ... or using an <aside class="notes"> element + var notesElement = slide.querySelector('aside.notes'); + if (notesElement) { + return notesElement.innerHTML; + } + + return null; + + } + + /** + * Retrieves the current state of the presentation as + * an object. This state can then be restored at any + * time. + * + * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}} + */ + function getState() { + + var indices = getIndices(); + + return { + indexh: indices.h, + indexv: indices.v, + indexf: indices.f, + paused: isPaused(), + overview: isOverview() + }; + + } + + /** + * Restores the presentation to the given state. + * + * @param {object} state As generated by getState() + * @see {@link getState} generates the parameter `state` + */ + function setState(state) { + + if (typeof state === 'object') { + slide(deserialize(state.indexh), deserialize(state.indexv), deserialize(state.indexf)); + + var pausedFlag = deserialize(state.paused), + overviewFlag = deserialize(state.overview); + + if (typeof pausedFlag === 'boolean' && pausedFlag !== isPaused()) { + togglePause(pausedFlag); + } + + if (typeof overviewFlag === 'boolean' && overviewFlag !== isOverview()) { + toggleOverview(overviewFlag); + } + } + + } + + /** + * Return a sorted fragments list, ordered by an increasing + * "data-fragment-index" attribute. + * + * Fragments will be revealed in the order that they are returned by + * this function, so you can use the index attributes to control the + * order of fragment appearance. + * + * To maintain a sensible default fragment order, fragments are presumed + * to be passed in document order. This function adds a "fragment-index" + * attribute to each node if such an attribute is not already present, + * and sets that attribute to an integer value which is the position of + * the fragment within the fragments list. + * + * @param {object[]|*} fragments + * @param {boolean} grouped If true the returned array will contain + * nested arrays for all fragments with the same index + * @return {object[]} sorted Sorted array of fragments + */ + function sortFragments(fragments, grouped) { + + fragments = toArray(fragments); + + var ordered = [], + unordered = [], + sorted = []; + + // Group ordered and unordered elements + fragments.forEach(function (fragment, i) { + if (fragment.hasAttribute('data-fragment-index')) { + var index = parseInt(fragment.getAttribute('data-fragment-index'), 10); + + if (!ordered[index]) { + ordered[index] = []; + } + + ordered[index].push(fragment); + } else { + unordered.push([fragment]); + } + }); + + // Append fragments without explicit indices in their + // DOM order + ordered = ordered.concat(unordered); + + // Manually count the index up per group to ensure there + // are no gaps + var index = 0; + + // Push all fragments in their sorted order to an array, + // this flattens the groups + ordered.forEach(function (group) { + group.forEach(function (fragment) { + sorted.push(fragment); + fragment.setAttribute('data-fragment-index', index); + }); + + index++; + }); + + return grouped === true ? ordered : sorted; + + } + + /** + * Navigate to the specified slide fragment. + * + * @param {?number} index The index of the fragment that + * should be shown, -1 means all are invisible + * @param {number} offset Integer offset to apply to the + * fragment index + * + * @return {boolean} true if a change was made in any + * fragments visibility as part of this call + */ + function navigateFragment(index, offset) { + + if (currentSlide && config.fragments) { + + var fragments = sortFragments(currentSlide.querySelectorAll('.fragment')); + if (fragments.length) { + + // If no index is specified, find the current + if (typeof index !== 'number') { + var lastVisibleFragment = sortFragments(currentSlide.querySelectorAll('.fragment.visible')).pop(); + + if (lastVisibleFragment) { + index = parseInt(lastVisibleFragment.getAttribute('data-fragment-index') || 0, 10); + } else { + index = -1; + } + } + + // If an offset is specified, apply it to the index + if (typeof offset === 'number') { + index += offset; + } + + var fragmentsShown = [], + fragmentsHidden = []; + + toArray(fragments).forEach(function (element, i) { + + if (element.hasAttribute('data-fragment-index')) { + i = parseInt(element.getAttribute('data-fragment-index'), 10); + } + + // Visible fragments + if (i <= index) { + if (!element.classList.contains('visible')) fragmentsShown.push(element); + element.classList.add('visible'); + element.classList.remove('current-fragment'); + + // Announce the fragments one by one to the Screen Reader + dom.statusDiv.textContent = getStatusText(element); + + if (i === index) { + element.classList.add('current-fragment'); + startEmbeddedContent(element); + } + } + // Hidden fragments + else { + if (element.classList.contains('visible')) fragmentsHidden.push(element); + element.classList.remove('visible'); + element.classList.remove('current-fragment'); + } + + }); + + if (fragmentsHidden.length) { + dispatchEvent('fragmenthidden', { + fragment: fragmentsHidden[0], + fragments: fragmentsHidden + }); + } + + if (fragmentsShown.length) { + dispatchEvent('fragmentshown', {fragment: fragmentsShown[0], fragments: fragmentsShown}); + } + + updateControls(); + updateProgress(); + if (config.fragmentInURL) { + writeURL(); + } + + return !!(fragmentsShown.length || fragmentsHidden.length); + + } + + } + + return false; + + } + + /** + * Navigate to the next slide fragment. + * + * @return {boolean} true if there was a next fragment, + * false otherwise + */ + function nextFragment() { + + return navigateFragment(null, 1); + + } + + /** + * Navigate to the previous slide fragment. + * + * @return {boolean} true if there was a previous fragment, + * false otherwise + */ + function previousFragment() { + + return navigateFragment(null, -1); + + } + + /** + * Cues a new automated slide if enabled in the config. + */ + function cueAutoSlide() { + + cancelAutoSlide(); + + if (currentSlide && config.autoSlide !== false) { + + var fragment = currentSlide.querySelector('.current-fragment'); + + // When the slide first appears there is no "current" fragment so + // we look for a data-autoslide timing on the first fragment + if (!fragment) fragment = currentSlide.querySelector('.fragment'); + + var fragmentAutoSlide = fragment ? fragment.getAttribute('data-autoslide') : null; + var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute('data-autoslide') : null; + var slideAutoSlide = currentSlide.getAttribute('data-autoslide'); + + // Pick value in the following priority order: + // 1. Current fragment's data-autoslide + // 2. Current slide's data-autoslide + // 3. Parent slide's data-autoslide + // 4. Global autoSlide setting + if (fragmentAutoSlide) { + autoSlide = parseInt(fragmentAutoSlide, 10); + } else if (slideAutoSlide) { + autoSlide = parseInt(slideAutoSlide, 10); + } else if (parentAutoSlide) { + autoSlide = parseInt(parentAutoSlide, 10); + } else { + autoSlide = config.autoSlide; + } + + // If there are media elements with data-autoplay, + // automatically set the autoSlide duration to the + // length of that media. Not applicable if the slide + // is divided up into fragments. + // playbackRate is accounted for in the duration. + if (currentSlide.querySelectorAll('.fragment').length === 0) { + toArray(currentSlide.querySelectorAll('video, audio')).forEach(function (el) { + if (el.hasAttribute('data-autoplay')) { + if (autoSlide && (el.duration * 1000 / el.playbackRate) > autoSlide) { + autoSlide = (el.duration * 1000 / el.playbackRate) + 1000; + } + } + }); + } + + // Cue the next auto-slide if: + // - There is an autoSlide value + // - Auto-sliding isn't paused by the user + // - The presentation isn't paused + // - The overview isn't active + // - The presentation isn't over + if (autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && (!Reveal.isLastSlide() || availableFragments().next || config.loop === true)) { + autoSlideTimeout = setTimeout(function () { + typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext(); + cueAutoSlide(); + }, autoSlide); + autoSlideStartTime = Date.now(); + } + + if (autoSlidePlayer) { + autoSlidePlayer.setPlaying(autoSlideTimeout !== -1); + } + + } + + } + + /** + * Cancels any ongoing request to auto-slide. + */ + function cancelAutoSlide() { + + clearTimeout(autoSlideTimeout); + autoSlideTimeout = -1; + + } + + function pauseAutoSlide() { + + if (autoSlide && !autoSlidePaused) { + autoSlidePaused = true; + dispatchEvent('autoslidepaused'); + clearTimeout(autoSlideTimeout); + + if (autoSlidePlayer) { + autoSlidePlayer.setPlaying(false); + } + } + + } + + function resumeAutoSlide() { + + if (autoSlide && autoSlidePaused) { + autoSlidePaused = false; + dispatchEvent('autoslideresumed'); + cueAutoSlide(); + } + + } + + function navigateLeft() { + + // Reverse for RTL + if (config.rtl) { + if ((isOverview() || nextFragment() === false) && availableRoutes().left) { + slide(indexh + 1); + } + } + // Normal navigation + else if ((isOverview() || previousFragment() === false) && availableRoutes().left) { + slide(indexh - 1); + } + + } + + function navigateRight() { + + hasNavigatedRight = true; + + // Reverse for RTL + if (config.rtl) { + if ((isOverview() || previousFragment() === false) && availableRoutes().right) { + slide(indexh - 1); + } + } + // Normal navigation + else if ((isOverview() || nextFragment() === false) && availableRoutes().right) { + slide(indexh + 1); + } + + } + + function navigateUp() { + + // Prioritize hiding fragments + if ((isOverview() || previousFragment() === false) && availableRoutes().up) { + slide(indexh, indexv - 1); + } + + } + + function navigateDown() { + + hasNavigatedDown = true; + + // Prioritize revealing fragments + if ((isOverview() || nextFragment() === false) && availableRoutes().down) { + slide(indexh, indexv + 1); + } + + } + + /** + * Navigates backwards, prioritized in the following order: + * 1) Previous fragment + * 2) Previous vertical slide + * 3) Previous horizontal slide + */ + function navigatePrev() { + + // Prioritize revealing fragments + if (previousFragment() === false) { + if (availableRoutes().up) { + navigateUp(); + } else { + // Fetch the previous horizontal slide, if there is one + var previousSlide; + + if (config.rtl) { + previousSlide = toArray(dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR + '.future')).pop(); + } else { + previousSlide = toArray(dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR + '.past')).pop(); + } + + if (previousSlide) { + var v = (previousSlide.querySelectorAll('section').length - 1) || undefined; + var h = indexh - 1; + slide(h, v); + } + } + } + + } + + /** + * The reverse of #navigatePrev(). + */ + function navigateNext() { + + hasNavigatedRight = true; + hasNavigatedDown = true; + + // Prioritize revealing fragments + if (nextFragment() === false) { + + var routes = availableRoutes(); + + // When looping is enabled `routes.down` is always available + // so we need a separate check for when we've reached the + // end of a stack and should move horizontally + if (routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide(currentSlide)) { + routes.down = false; + } + + if (routes.down) { + navigateDown(); + } else if (config.rtl) { + navigateLeft(); + } else { + navigateRight(); + } + } + + } + + /** + * Checks if the target element prevents the triggering of + * swipe navigation. + */ + function isSwipePrevented(target) { + + while (target && typeof target.hasAttribute === 'function') { + if (target.hasAttribute('data-prevent-swipe')) return true; + target = target.parentNode; + } + + return false; + + } + + + // --------------------------------------------------------------------// + // ----------------------------- EVENTS -------------------------------// + // --------------------------------------------------------------------// + + /** + * Called by all event handlers that are based on user + * input. + * + * @param {object} [event] + */ + function onUserInput(event) { + + if (config.autoSlideStoppable) { + pauseAutoSlide(); + } + + } + + /** + * Handler for the document level 'keypress' event. + * + * @param {object} event + */ + function onDocumentKeyPress(event) { + + // Check if the pressed key is question mark + if (event.shiftKey && event.charCode === 63) { + toggleHelp(); + } + + } + + /** + * Handler for the document level 'keydown' event. + * + * @param {object} event + */ + function onDocumentKeyDown(event) { + + // If there's a condition specified and it returns false, + // ignore this event + if (typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false) { + return true; + } + + // Remember if auto-sliding was paused so we can toggle it + var autoSlideWasPaused = autoSlidePaused; + + onUserInput(event); + + // Check if there's a focused element that could be using + // the keyboard + var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit'; + var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test(document.activeElement.tagName); + var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test(document.activeElement.className); + + // Disregard the event if there's a focused element or a + // keyboard modifier key is present + if (activeElementIsCE || activeElementIsInput || activeElementIsNotes || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey) return; + + // While paused only allow resume keyboard events; 'b', 'v', '.' + var resumeKeyCodes = [66, 86, 190, 191]; + var key; + + // Custom key bindings for togglePause should be able to resume + if (typeof config.keyboard === 'object') { + for (key in config.keyboard) { + if (config.keyboard[key] === 'togglePause') { + resumeKeyCodes.push(parseInt(key, 10)); + } + } + } + + if (isPaused() && resumeKeyCodes.indexOf(event.keyCode) === -1) { + return false; + } + + var triggered = false; + + // 1. User defined key bindings + if (typeof config.keyboard === 'object') { + + for (key in config.keyboard) { + + // Check if this binding matches the pressed key + if (parseInt(key, 10) === event.keyCode) { + + var value = config.keyboard[key]; + + // Callback function + if (typeof value === 'function') { + value.apply(null, [event]); + } + // String shortcuts to reveal.js API + else if (typeof value === 'string' && typeof Reveal[value] === 'function') { + Reveal[value].call(); + } + + triggered = true; + + } + + } + + } + + // 2. Registered custom key bindings + if (triggered === false) { + + for (key in registeredKeyBindings) { + + // Check if this binding matches the pressed key + if (parseInt(key, 10) === event.keyCode) { + + var action = registeredKeyBindings[key].callback; + + // Callback function + if (typeof action === 'function') { + action.apply(null, [event]); + } + // String shortcuts to reveal.js API + else if (typeof action === 'string' && typeof Reveal[action] === 'function') { + Reveal[action].call(); + } + + triggered = true; + } + } + } + + // 3. System defined key bindings + if (triggered === false) { + + // Assume true and try to prove false + triggered = true; + + switch (event.keyCode) { + // p, page up + case 80: + case 33: + navigatePrev(); + break; + // n, page down + case 78: + case 34: + navigateNext(); + break; + // h, left + case 72: + case 37: + navigateLeft(); + break; + // l, right + case 76: + case 39: + navigateRight(); + break; + // k, up + case 75: + case 38: + navigateUp(); + break; + // j, down + case 74: + case 40: + navigateDown(); + break; + // home + case 36: + slide(0); + break; + // end + case 35: + slide(Number.MAX_VALUE); + break; + // space + case 32: + isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); + break; + // return + case 13: + isOverview() ? deactivateOverview() : triggered = false; + break; + // two-spot, semicolon, b, v, period, Logitech presenter tools "black screen" button + case 58: + case 59: + case 66: + case 86: + case 190: + case 191: + togglePause(); + break; + // f + case 70: + enterFullscreen(); + break; + // a + case 65: + if (config.autoSlideStoppable) toggleAutoSlide(autoSlideWasPaused); + break; + default: + triggered = false; + } + + } + + // If the input resulted in a triggered action we should prevent + // the browsers default behavior + if (triggered) { + event.preventDefault && event.preventDefault(); + } + // ESC or O key + else if ((event.keyCode === 27 || event.keyCode === 79) && features.transforms3d) { + if (dom.overlay) { + closeOverlay(); + } else { + toggleOverview(); + } + + event.preventDefault && event.preventDefault(); + } + + // If auto-sliding is enabled we need to cue up + // another timeout + cueAutoSlide(); + + } + + /** + * Handler for the 'touchstart' event, enables support for + * swipe and pinch gestures. + * + * @param {object} event + */ + function onTouchStart(event) { + + if (isSwipePrevented(event.target)) return true; + + touch.startX = event.touches[0].clientX; + touch.startY = event.touches[0].clientY; + touch.startCount = event.touches.length; + + // If there's two touches we need to memorize the distance + // between those two points to detect pinching + if (event.touches.length === 2 && config.overview) { + touch.startSpan = distanceBetween({ + x: event.touches[1].clientX, + y: event.touches[1].clientY + }, { + x: touch.startX, + y: touch.startY + }); + } + + } + + /** + * Handler for the 'touchmove' event. + * + * @param {object} event + */ + function onTouchMove(event) { + + if (isSwipePrevented(event.target)) return true; + + // Each touch should only trigger one action + if (!touch.captured) { + onUserInput(event); + + var currentX = event.touches[0].clientX; + var currentY = event.touches[0].clientY; + + // If the touch started with two points and still has + // two active touches; test for the pinch gesture + if (event.touches.length === 2 && touch.startCount === 2 && config.overview) { + + // The current distance in pixels between the two touch points + var currentSpan = distanceBetween({ + x: event.touches[1].clientX, + y: event.touches[1].clientY + }, { + x: touch.startX, + y: touch.startY + }); + + // If the span is larger than the desire amount we've got + // ourselves a pinch + if (Math.abs(touch.startSpan - currentSpan) > touch.threshold) { + touch.captured = true; + + if (currentSpan < touch.startSpan) { + activateOverview(); + } else { + deactivateOverview(); + } + } + + event.preventDefault(); + + } + // There was only one touch point, look for a swipe + else if (event.touches.length === 1 && touch.startCount !== 2) { + + var deltaX = currentX - touch.startX, + deltaY = currentY - touch.startY; + + if (deltaX > touch.threshold && Math.abs(deltaX) > Math.abs(deltaY)) { + touch.captured = true; + navigateLeft(); + } else if (deltaX < -touch.threshold && Math.abs(deltaX) > Math.abs(deltaY)) { + touch.captured = true; + navigateRight(); + } else if (deltaY > touch.threshold) { + touch.captured = true; + navigateUp(); + } else if (deltaY < -touch.threshold) { + touch.captured = true; + navigateDown(); + } + + // If we're embedded, only block touch events if they have + // triggered an action + if (config.embedded) { + if (touch.captured || isVerticalSlide(currentSlide)) { + event.preventDefault(); + } + } + // Not embedded? Block them all to avoid needless tossing + // around of the viewport in iOS + else { + event.preventDefault(); + } + + } + } + // There's a bug with swiping on some Android devices unless + // the default action is always prevented + else if (UA.match(/android/gi)) { + event.preventDefault(); + } + + } + + /** + * Handler for the 'touchend' event. + * + * @param {object} event + */ + function onTouchEnd(event) { + + touch.captured = false; + + } + + /** + * Convert pointer down to touch start. + * + * @param {object} event + */ + function onPointerDown(event) { + + if (event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch") { + event.touches = [{clientX: event.clientX, clientY: event.clientY}]; + onTouchStart(event); + } + + } + + /** + * Convert pointer move to touch move. + * + * @param {object} event + */ + function onPointerMove(event) { + + if (event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch") { + event.touches = [{clientX: event.clientX, clientY: event.clientY}]; + onTouchMove(event); + } + + } + + /** + * Convert pointer up to touch end. + * + * @param {object} event + */ + function onPointerUp(event) { + + if (event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch") { + event.touches = [{clientX: event.clientX, clientY: event.clientY}]; + onTouchEnd(event); + } + + } + + /** + * Handles mouse wheel scrolling, throttled to avoid skipping + * multiple slides. + * + * @param {object} event + */ + function onDocumentMouseScroll(event) { + + if (Date.now() - lastMouseWheelStep > 600) { + + lastMouseWheelStep = Date.now(); + + var delta = event.detail || -event.wheelDelta; + if (delta > 0) { + navigateNext(); + } else if (delta < 0) { + navigatePrev(); + } + + } + + } + + /** + * Clicking on the progress bar results in a navigation to the + * closest approximate horizontal slide using this equation: + * + * ( clickX / presentationWidth ) * numberOfSlides + * + * @param {object} event + */ + function onProgressClicked(event) { + + onUserInput(event); + + event.preventDefault(); + + var slidesTotal = toArray(dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR)).length; + var slideIndex = Math.floor((event.clientX / dom.wrapper.offsetWidth) * slidesTotal); + + if (config.rtl) { + slideIndex = slidesTotal - slideIndex; + } + + slide(slideIndex); + + } + + /** + * Event handler for navigation control buttons. + */ + function onNavigateLeftClicked(event) { + event.preventDefault(); + onUserInput(); + navigateLeft(); + } + + function onNavigateRightClicked(event) { + event.preventDefault(); + onUserInput(); + navigateRight(); + } + + function onNavigateUpClicked(event) { + event.preventDefault(); + onUserInput(); + navigateUp(); + } + + function onNavigateDownClicked(event) { + event.preventDefault(); + onUserInput(); + navigateDown(); + } + + function onNavigatePrevClicked(event) { + event.preventDefault(); + onUserInput(); + navigatePrev(); + } + + function onNavigateNextClicked(event) { + event.preventDefault(); + onUserInput(); + navigateNext(); + } + + /** + * Handler for the window level 'hashchange' event. + * + * @param {object} [event] + */ + function onWindowHashChange(event) { + + readURL(); + + } + + /** + * Handler for the window level 'resize' event. + * + * @param {object} [event] + */ + function onWindowResize(event) { + + layout(); + + } + + /** + * Handle for the window level 'visibilitychange' event. + * + * @param {object} [event] + */ + function onPageVisibilityChange(event) { + + var isHidden = document.webkitHidden || + document.msHidden || + document.hidden; + + // If, after clicking a link or similar and we're coming back, + // focus the document.body to ensure we can use keyboard shortcuts + if (isHidden === false && document.activeElement !== document.body) { + // Not all elements support .blur() - SVGs among them. + if (typeof document.activeElement.blur === 'function') { + document.activeElement.blur(); + } + document.body.focus(); + } + + } + + /** + * Invoked when a slide is and we're in the overview. + * + * @param {object} event + */ + function onOverviewSlideClicked(event) { + + // TODO There's a bug here where the event listeners are not + // removed after deactivating the overview. + if (eventsAreBound && isOverview()) { + event.preventDefault(); + + var element = event.target; + + while (element && !element.nodeName.match(/section/gi)) { + element = element.parentNode; + } + + if (element && !element.classList.contains('disabled')) { + + deactivateOverview(); + + if (element.nodeName.match(/section/gi)) { + var h = parseInt(element.getAttribute('data-index-h'), 10), + v = parseInt(element.getAttribute('data-index-v'), 10); + + slide(h, v); + } + + } + } + + } + + /** + * Handles clicks on links that are set to preview in the + * iframe overlay. + * + * @param {object} event + */ + function onPreviewLinkClicked(event) { + + if (event.currentTarget && event.currentTarget.hasAttribute('href')) { + var url = event.currentTarget.getAttribute('href'); + if (url) { + showPreview(url); + event.preventDefault(); + } + } + + } + + /** + * Handles click on the auto-sliding controls element. + * + * @param {object} [event] + */ + function onAutoSlidePlayerClick(event) { + + // Replay + if (Reveal.isLastSlide() && config.loop === false) { + slide(0, 0); + resumeAutoSlide(); + } + // Resume + else if (autoSlidePaused) { + resumeAutoSlide(); + } + // Pause + else { + pauseAutoSlide(); + } - // Draw progress track - this.context.beginPath(); - this.context.arc( x, y, radius, 0, Math.PI * 2, false ); - this.context.lineWidth = this.thickness; - this.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )'; - this.context.stroke(); + } + + + // --------------------------------------------------------------------// + // ------------------------ PLAYBACK COMPONENT ------------------------// + // --------------------------------------------------------------------// + + + /** + * Constructor for the playback component, which displays + * play/pause/progress controls. + * + * @param {HTMLElement} container The component will append + * itself to this + * @param {function} progressCheck A method which will be + * called frequently to get the current progress on a range + * of 0-1 + */ + function Playback(container, progressCheck) { + + // Cosmetics + this.diameter = 100; + this.diameter2 = this.diameter / 2; + this.thickness = 6; - if( this.playing ) { - // Draw progress on top of track - this.context.beginPath(); - this.context.arc( x, y, radius, startAngle, endAngle, false ); - this.context.lineWidth = this.thickness; - this.context.strokeStyle = '#fff'; - this.context.stroke(); - } + // Flags if we are currently playing + this.playing = false; + + // Current progress on a 0-1 range + this.progress = 0; + + // Used to loop the animation smoothly + this.progressOffset = 1; - this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) ); + this.container = container; + this.progressCheck = progressCheck; + + this.canvas = document.createElement('canvas'); + this.canvas.className = 'playback'; + this.canvas.width = this.diameter; + this.canvas.height = this.diameter; + this.canvas.style.width = this.diameter2 + 'px'; + this.canvas.style.height = this.diameter2 + 'px'; + this.context = this.canvas.getContext('2d'); + + this.container.appendChild(this.canvas); + + this.render(); + + } + + /** + * @param value + */ + Playback.prototype.setPlaying = function (value) { + + var wasPlaying = this.playing; + + this.playing = value; + + // Start repainting if we weren't already + if (!wasPlaying && this.playing) { + this.animate(); + } else { + this.render(); + } + + }; + + Playback.prototype.animate = function () { + + var progressBefore = this.progress; + + this.progress = this.progressCheck(); - // Draw play/pause icons - if( this.playing ) { - this.context.fillStyle = '#fff'; - this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize ); - this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize ); - } - else { - this.context.beginPath(); - this.context.translate( 4, 0 ); - this.context.moveTo( 0, 0 ); - this.context.lineTo( iconSize - 4, iconSize / 2 ); - this.context.lineTo( 0, iconSize ); - this.context.fillStyle = '#fff'; - this.context.fill(); - } + // When we loop, offset the progress so that it eases + // smoothly rather than immediately resetting + if (progressBefore > 0.8 && this.progress < 0.2) { + this.progressOffset = this.progress; + } - this.context.restore(); + this.render(); - }; + if (this.playing) { + features.requestAnimationFrameMethod.call(window, this.animate.bind(this)); + } - Playback.prototype.on = function( type, listener ) { - this.canvas.addEventListener( type, listener, false ); - }; + }; - Playback.prototype.off = function( type, listener ) { - this.canvas.removeEventListener( type, listener, false ); - }; + /** + * Renders the current progress and playback state. + */ + Playback.prototype.render = function () { - Playback.prototype.destroy = function() { + var progress = this.playing ? this.progress : 0, + radius = (this.diameter2) - this.thickness, + x = this.diameter2, + y = this.diameter2, + iconSize = 28; - this.playing = false; + // Ease towards 1 + this.progressOffset += (1 - this.progressOffset) * 0.1; - if( this.canvas.parentNode ) { - this.container.removeChild( this.canvas ); - } + var endAngle = (-Math.PI / 2) + (progress * (Math.PI * 2)); + var startAngle = (-Math.PI / 2) + (this.progressOffset * (Math.PI * 2)); - }; + this.context.save(); + this.context.clearRect(0, 0, this.diameter, this.diameter); + + // Solid background color + this.context.beginPath(); + this.context.arc(x, y, radius + 4, 0, Math.PI * 2, false); + this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )'; + this.context.fill(); + // Draw progress track + this.context.beginPath(); + this.context.arc(x, y, radius, 0, Math.PI * 2, false); + this.context.lineWidth = this.thickness; + this.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )'; + this.context.stroke(); - // --------------------------------------------------------------------// - // ------------------------------- API --------------------------------// - // --------------------------------------------------------------------// + if (this.playing) { + // Draw progress on top of track + this.context.beginPath(); + this.context.arc(x, y, radius, startAngle, endAngle, false); + this.context.lineWidth = this.thickness; + this.context.strokeStyle = '#fff'; + this.context.stroke(); + } + this.context.translate(x - (iconSize / 2), y - (iconSize / 2)); - Reveal = { - VERSION: VERSION, + // Draw play/pause icons + if (this.playing) { + this.context.fillStyle = '#fff'; + this.context.fillRect(0, 0, iconSize / 2 - 4, iconSize); + this.context.fillRect(iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize); + } else { + this.context.beginPath(); + this.context.translate(4, 0); + this.context.moveTo(0, 0); + this.context.lineTo(iconSize - 4, iconSize / 2); + this.context.lineTo(0, iconSize); + this.context.fillStyle = '#fff'; + this.context.fill(); + } - initialize: initialize, - configure: configure, + this.context.restore(); - sync: sync, - syncSlide: syncSlide, - syncFragments: syncFragments, + }; - // Navigation methods - slide: slide, - left: navigateLeft, - right: navigateRight, - up: navigateUp, - down: navigateDown, - prev: navigatePrev, - next: navigateNext, + Playback.prototype.on = function (type, listener) { + this.canvas.addEventListener(type, listener, false); + }; - // Fragment methods - navigateFragment: navigateFragment, - prevFragment: previousFragment, - nextFragment: nextFragment, + Playback.prototype.off = function (type, listener) { + this.canvas.removeEventListener(type, listener, false); + }; - // Deprecated aliases - navigateTo: slide, - navigateLeft: navigateLeft, - navigateRight: navigateRight, - navigateUp: navigateUp, - navigateDown: navigateDown, - navigatePrev: navigatePrev, - navigateNext: navigateNext, - - // Forces an update in slide layout - layout: layout, + Playback.prototype.destroy = function () { - // Randomizes the order of slides - shuffle: shuffle, + this.playing = false; - // Returns an object with the available routes as booleans (left/right/top/bottom) - availableRoutes: availableRoutes, + if (this.canvas.parentNode) { + this.container.removeChild(this.canvas); + } - // Returns an object with the available fragments as booleans (prev/next) - availableFragments: availableFragments, + }; - // Toggles a help overlay with keyboard shortcuts - toggleHelp: toggleHelp, - // Toggles the overview mode on/off - toggleOverview: toggleOverview, + // --------------------------------------------------------------------// + // ------------------------------- API --------------------------------// + // --------------------------------------------------------------------// - // Toggles the "black screen" mode on/off - togglePause: togglePause, - // Toggles the auto slide mode on/off - toggleAutoSlide: toggleAutoSlide, + Reveal = { + VERSION: VERSION, - // State checks - isOverview: isOverview, - isPaused: isPaused, - isAutoSliding: isAutoSliding, - isSpeakerNotes: isSpeakerNotes, + initialize: initialize, + configure: configure, - // Slide preloading - loadSlide: loadSlide, - unloadSlide: unloadSlide, + sync: sync, + syncSlide: syncSlide, + syncFragments: syncFragments, - // Adds or removes all internal event listeners (such as keyboard) - addEventListeners: addEventListeners, - removeEventListeners: removeEventListeners, + // Navigation methods + slide: slide, + left: navigateLeft, + right: navigateRight, + up: navigateUp, + down: navigateDown, + prev: navigatePrev, + next: navigateNext, - // Facility for persisting and restoring the presentation state - getState: getState, - setState: setState, + // Fragment methods + navigateFragment: navigateFragment, + prevFragment: previousFragment, + nextFragment: nextFragment, - // Presentation progress - getSlidePastCount: getSlidePastCount, + // Deprecated aliases + navigateTo: slide, + navigateLeft: navigateLeft, + navigateRight: navigateRight, + navigateUp: navigateUp, + navigateDown: navigateDown, + navigatePrev: navigatePrev, + navigateNext: navigateNext, - // Presentation progress on range of 0-1 - getProgress: getProgress, + // Forces an update in slide layout + layout: layout, - // Returns the indices of the current, or specified, slide - getIndices: getIndices, + // Randomizes the order of slides + shuffle: shuffle, - // Returns an Array of all slides - getSlides: getSlides, + // Returns an object with the available routes as booleans (left/right/top/bottom) + availableRoutes: availableRoutes, - // Returns the total number of slides - getTotalSlides: getTotalSlides, + // Returns an object with the available fragments as booleans (prev/next) + availableFragments: availableFragments, - // Returns the slide element at the specified index - getSlide: getSlide, + // Toggles a help overlay with keyboard shortcuts + toggleHelp: toggleHelp, - // Returns the slide background element at the specified index - getSlideBackground: getSlideBackground, - - // Returns the speaker notes string for a slide, or null - getSlideNotes: getSlideNotes, + // Toggles the overview mode on/off + toggleOverview: toggleOverview, - // Returns the previous slide element, may be null - getPreviousSlide: function() { - return previousSlide; - }, - - // Returns the current slide element - getCurrentSlide: function() { - return currentSlide; - }, - - // Returns the current scale of the presentation content - getScale: function() { - return scale; - }, - - // Returns the current configuration object - getConfig: function() { - return config; - }, + // Toggles the "black screen" mode on/off + togglePause: togglePause, - // Helper method, retrieves query string as a key/value hash - getQueryHash: function() { - var query = {}; + // Toggles the auto slide mode on/off + toggleAutoSlide: toggleAutoSlide, - location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) { - query[ a.split( '=' ).shift() ] = a.split( '=' ).pop(); - } ); + // State checks + isOverview: isOverview, + isPaused: isPaused, + isAutoSliding: isAutoSliding, + isSpeakerNotes: isSpeakerNotes, - // Basic deserialization - for( var i in query ) { - var value = query[ i ]; + // Slide preloading + loadSlide: loadSlide, + unloadSlide: unloadSlide, - query[ i ] = deserialize( unescape( value ) ); - } + // Adds or removes all internal event listeners (such as keyboard) + addEventListeners: addEventListeners, + removeEventListeners: removeEventListeners, - return query; - }, + // Facility for persisting and restoring the presentation state + getState: getState, + setState: setState, - // Returns true if we're currently on the first slide - isFirstSlide: function() { - return ( indexh === 0 && indexv === 0 ); - }, + // Presentation progress + getSlidePastCount: getSlidePastCount, - // Returns true if we're currently on the last slide - isLastSlide: function() { - if( currentSlide ) { - // Does this slide have a next sibling? - if( currentSlide.nextElementSibling ) return false; + // Presentation progress on range of 0-1 + getProgress: getProgress, - // If it's vertical, does its parent have a next sibling? - if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false; + // Returns the indices of the current, or specified, slide + getIndices: getIndices, - return true; - } - - return false; - }, - - // Returns true if we're on the last slide in the current - // vertical stack - isLastVerticalSlide: function() { - if( currentSlide && isVerticalSlide( currentSlide ) ) { - // Does this slide have a next sibling? - if( currentSlide.nextElementSibling ) return false; - - return true; - } + // Returns an Array of all slides + getSlides: getSlides, - return false; - }, - - // Checks if reveal.js has been loaded and is ready for use - isReady: function() { - return loaded; - }, + // Returns the total number of slides + getTotalSlides: getTotalSlides, - // Forward event binding to the reveal DOM element - addEventListener: function( type, listener, useCapture ) { - if( 'addEventListener' in window ) { - ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture ); - } - }, - removeEventListener: function( type, listener, useCapture ) { - if( 'addEventListener' in window ) { - ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture ); - } - }, - - // Adds a custom key binding - addKeyBinding: addKeyBinding, - - // Removes a custom key binding - removeKeyBinding: removeKeyBinding, - - // Programatically triggers a keyboard event - triggerKey: function( keyCode ) { - onDocumentKeyDown( { keyCode: keyCode } ); - }, - - // Registers a new shortcut to include in the help overlay - registerKeyboardShortcut: function( key, value ) { - keyboardShortcuts[key] = value; - } - }; - - return Reveal; + // Returns the slide element at the specified index + getSlide: getSlide, + + // Returns the slide background element at the specified index + getSlideBackground: getSlideBackground, + + // Returns the speaker notes string for a slide, or null + getSlideNotes: getSlideNotes, + + // Returns the previous slide element, may be null + getPreviousSlide: function () { + return previousSlide; + }, + + // Returns the current slide element + getCurrentSlide: function () { + return currentSlide; + }, + + // Returns the current scale of the presentation content + getScale: function () { + return scale; + }, + + // Returns the current configuration object + getConfig: function () { + return config; + }, + + // Helper method, retrieves query string as a key/value hash + getQueryHash: function () { + var query = {}; + + location.search.replace(/[A-Z0-9]+?=([\w\.%-]*)/gi, function (a) { + query[a.split('=').shift()] = a.split('=').pop(); + }); + + // Basic deserialization + for (var i in query) { + var value = query[i]; + + query[i] = deserialize(unescape(value)); + } + + return query; + }, + + // Returns true if we're currently on the first slide + isFirstSlide: function () { + return (indexh === 0 && indexv === 0); + }, + + // Returns true if we're currently on the last slide + isLastSlide: function () { + if (currentSlide) { + // Does this slide have a next sibling? + if (currentSlide.nextElementSibling) return false; + + // If it's vertical, does its parent have a next sibling? + if (isVerticalSlide(currentSlide) && currentSlide.parentNode.nextElementSibling) return false; + + return true; + } + + return false; + }, + + // Returns true if we're on the last slide in the current + // vertical stack + isLastVerticalSlide: function () { + if (currentSlide && isVerticalSlide(currentSlide)) { + // Does this slide have a next sibling? + if (currentSlide.nextElementSibling) return false; + + return true; + } + + return false; + }, + + // Checks if reveal.js has been loaded and is ready for use + isReady: function () { + return loaded; + }, + + // Forward event binding to the reveal DOM element + addEventListener: function (type, listener, useCapture) { + if ('addEventListener' in window) { + (dom.wrapper || document.querySelector('.reveal')).addEventListener(type, listener, useCapture); + } + }, + removeEventListener: function (type, listener, useCapture) { + if ('addEventListener' in window) { + (dom.wrapper || document.querySelector('.reveal')).removeEventListener(type, listener, useCapture); + } + }, + + // Adds a custom key binding + addKeyBinding: addKeyBinding, + + // Removes a custom key binding + removeKeyBinding: removeKeyBinding, + + // Programatically triggers a keyboard event + triggerKey: function (keyCode) { + onDocumentKeyDown({keyCode: keyCode}); + }, + + // Registers a new shortcut to include in the help overlay + registerKeyboardShortcut: function (key, value) { + keyboardShortcuts[key] = value; + } + }; + + return Reveal; })); |