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Diffstat (limited to 'slides/bower_components/reveal.js/js/reveal.js')
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diff --git a/slides/bower_components/reveal.js/js/reveal.js b/slides/bower_components/reveal.js/js/reveal.js deleted file mode 100644 index f125c55..0000000 --- a/slides/bower_components/reveal.js/js/reveal.js +++ /dev/null @@ -1,5239 +0,0 @@ -/*! - * reveal.js - * http://revealjs.com - * MIT licensed - * - * Copyright (C) 2017 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() { - - 'use strict'; - - var Reveal; - - // The reveal.js version - var VERSION = '3.6.0'; - - 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, - - // 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, - - // 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, - - // 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, - - // Determines where controls appear, "edges" or "bottom-right" - controlsLayout: 'bottom-right', - - // Visibility rule for backwards navigation arrows; "faded", "hidden" - // or "visible" - controlsBackArrows: 'faded', - - // Display a presentation progress bar - progress: true, - - // Display the page number of the current slide - slideNumber: false, - - // Determine which displays to show the slide number on - showSlideNumber: 'all', - - // Push each slide change to the browser history - history: false, - - // Enable keyboard shortcuts for navigation - keyboard: true, - - // Optional function that blocks keyboard events when retuning false - keyboardCondition: null, - - // Enable the slide overview mode - overview: true, - - // Vertical centering of slides - center: true, - - // Enables touch navigation on devices with touch input - touch: true, - - // Loop the presentation - loop: false, - - // Change the presentation direction to be RTL - rtl: false, - - // Randomizes the order of slides each time the presentation loads - shuffle: false, - - // Turns fragments on and off globally - fragments: true, - - // 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 it should be possible to pause the presentation (blackout) - pause: true, - - // 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, - - // 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, - - // Use this method for navigation when auto-sliding (defaults to navigateNext) - autoSlideMethod: null, - - // Enable slide navigation via mouse wheel - mouseWheel: false, - - // Apply a 3D roll to links on hover - rollingLinks: false, - - // Hides the address bar on mobile devices - hideAddressBar: true, - - // Opens links in an iframe preview overlay - previewLinks: false, - - // Exposes the reveal.js API through window.postMessage - postMessage: true, - - // 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, - - // Transition style - transition: 'slide', // none/fade/slide/convex/concave/zoom - - // Transition speed - transitionSpeed: 'default', // default/fast/slow - - // 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 size - parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px" - - // 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, - - // 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, - - // The display mode that will be used to show slides - display: 'block', - - // Script dependencies to load - dependencies: [] - - }, - - // Flags if Reveal.initialize() has been called - initialized = false, - - // Flags if reveal.js is loaded (has dispatched the 'ready' event) - loaded = false, - - // Flags if the overview mode is currently active - overview = false, - - // 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 previous and current slide HTML elements - previousSlide, - currentSlide, - - previousBackground, - - // 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 = [], - - // 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: '' }, - - // Cached references to DOM elements - dom = {}, - - // Features supported by the browser, see #checkCapabilities() - features = {}, - - // Client is a mobile device, see #checkCapabilities() - isMobileDevice, - - // Client is a desktop Chrome, see #checkCapabilities() - isChrome, - - // Throttles mouse wheel navigation - lastMouseWheelStep = 0, - - // Delays updates to the URL due to a Chrome thumbnailer bug - writeURLTimeout = 0, - - // Flags if the interaction event listeners are bound - eventsAreBound = false, - - // The current auto-slide duration - autoSlide = 0, - - // 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 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' - }; - - /** - * 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 ) ); - - } - - /** - * 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$|[^\\\/]*$/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 - createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null ); - - 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 ); - } - } - - } ); - - // Show all fragments - toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).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; - - // 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 ) { - - 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' ) - }; - - var element = document.createElement( 'div' ); - - // Carry over custom classes from the slide to the background - element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' ); - - if( data.background ) { - // Auto-wrap image urls in url(...) - if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#]|$)/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 ); - } - - // Additional and optional background properties - if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize; - if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize ); - if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor; - if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat; - if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition; - if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition ); - - container.appendChild( element ); - - // If backgrounds are being recreated, clear old classes - slide.classList.remove( 'has-dark-background' ); - slide.classList.remove( 'has-light-background' ); - - slide.slideBackgroundElement = element; - - // 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' ); - } - } - } - - return element; - - } - - /** - * 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 ) { - dom.wrapper.addEventListener( 'touchstart', onTouchStart, false ); - dom.wrapper.addEventListener( 'touchmove', onTouchMove, false ); - dom.wrapper.addEventListener( 'touchend', onTouchEnd, false ); - - // Support pointer-style touch interaction as well - if( window.navigator.pointerEnabled ) { - // IE 11 uses un-prefixed version of 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 ); - } - } - - if( config.keyboard ) { - document.addEventListener( 'keydown', onDocumentKeyDown, false ); - document.addEventListener( 'keypress', onDocumentKeyPress, false ); - } - - if( config.progress && dom.progress ) { - dom.progress.addEventListener( 'click', onProgressClicked, 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( 'touchstart', onTouchStart, false ); - dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false ); - dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false ); - - // IE11 - if( window.navigator.pointerEnabled ) { - dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false ); - dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false ); - dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false ); - } - // IE10 - else if( window.navigator.msPointerEnabled ) { - dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false ); - dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false ); - dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, 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 ); } ); - } ); - - } - - /** - * 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 ); - - } - - /** - * 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 ); - - // 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>'; - } - - 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() ) { - - 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(); - - 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() { - - // 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' ) ) { - - 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)' ); - } ); - - } - } ); - - // 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)' ); - } ); - } ); - - } - - /** - * 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; - - 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; - - } - - /** - * 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 ) { - dispatchEvent( 'slidechanged', { - 'indexh': indexh, - 'indexv': indexv, - 'previousSlide': previousSlide, - 'currentSlide': currentSlide, - 'origin': o - } ); - } - else { - // 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.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 ); - } - } - - // 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(); - } - - } - - /** - * 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 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' ); - } - - } ); - - } ); - - } - - /** - * 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 verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); - verticalSlides.forEach( function( verticalSlide, y ) { - - sortFragments( verticalSlide.querySelectorAll( '.fragment' ) ); - - } ); - - if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) ); - - } ); - - } - - /** - * Randomly shuffles all slides in the deck. - */ - function shuffle() { - - 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 ) ] ); - - } ); - - } - - /** - * 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' ); - } - - // 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; - } - - 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 ) { - - if( typeof b === 'number' && !isNaN( b ) ) { - return '<span class="slide-number-a">'+ a +'</span>' + - '<span class="slide-number-delimiter">'+ delimiter +'</span>' + - '<span class="slide-number-b">'+ b +'</span>'; - } - else { - return '<span class="slide-number-a">'+ a +'</span>'; - } - - } - - /** - * 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 backgroundImageURL = currentBackground.style.backgroundImage || ''; - - // Restart GIFs (doesn't work in Firefox) - if( /\.gif/i.test( backgroundImageURL ) ) { - currentBackground.style.backgroundImage = ''; - window.getComputedStyle( currentBackground ).opacity; - currentBackground.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 indices = getIndices( slide ); - var background = getSlideBackground( indices.h, indices.v ); - if( background ) { - background.style.display = 'block'; - - // 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 ) { - background.style.backgroundImage = 'url('+ 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 +'">'; - } ); - - background.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%'; - - background.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 indices = getIndices( slide ); - var background = getSlideBackground( indices.h, indices.v ); - 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 || config.loop, - right: indexh < horizontalSlides.length - 1 || config.loop, - up: indexv > 0, - down: indexv < verticalSlides.length - 1 - }; - - // 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( el.readyState > 1 ) { - startEmbeddedMedia( { target: el } ); - } - 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 invalid and there is a name we can - // assume that this is a named link - if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) { - var element; - - // Ensure the named link is a valid HTML ID attribute - if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) { - // Find the slide with the specified ID - element = document.getElementById( name ); - } - - if( element ) { - // 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 { - // Read the index components of the hash - var h = parseInt( bits[0], 10 ) || 0, - v = parseInt( bits[1], 10 ) || 0; - - if( h !== indexh || v !== indexv ) { - slide( h, v ); - } - } - - } - - /** - * 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 ) { - var url = '/'; - - // Attempt to create a named link based on the slide's ID - var id = currentSlide.getAttribute( 'id' ); - if( id ) { - id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' ); - } - - // If the current slide has an ID, use that as a named link - if( typeof id === 'string' && id.length ) { - url = '/' + id; - } - // Otherwise use the /h/v index - else { - if( indexh > 0 || indexv > 0 ) url += indexh; - if( indexv > 0 ) url += '/' + indexv; - } - - window.location.hash = url; - } - } - - } - /** - * 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 {number} x Horizontal background index - * @param {number} y Vertical background index - * @return {(HTMLElement[]|*)} - */ - function getSlideBackground( x, y ) { - - var slide = getSlide( x, y ); - 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 - * @return {object[]} sorted Sorted array of fragments - */ - function sortFragments( fragments ) { - - 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 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(); - - 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 ) { - if( availableRoutes().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() === 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. 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; - - // 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.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; - } - - this.render(); - - if( this.playing ) { - features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) ); - } - - }; - - /** - * Renders the current progress and playback state. - */ - Playback.prototype.render = function() { - - 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; - - 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(); - - 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 ) ); - - // 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(); - } - - this.context.restore(); - - }; - - Playback.prototype.on = function( type, listener ) { - this.canvas.addEventListener( type, listener, false ); - }; - - Playback.prototype.off = function( type, listener ) { - this.canvas.removeEventListener( type, listener, false ); - }; - - Playback.prototype.destroy = function() { - - this.playing = false; - - if( this.canvas.parentNode ) { - this.container.removeChild( this.canvas ); - } - - }; - - - // --------------------------------------------------------------------// - // ------------------------------- API --------------------------------// - // --------------------------------------------------------------------// - - - Reveal = { - VERSION: VERSION, - - initialize: initialize, - configure: configure, - sync: sync, - - // Navigation methods - slide: slide, - left: navigateLeft, - right: navigateRight, - up: navigateUp, - down: navigateDown, - prev: navigatePrev, - next: navigateNext, - - // Fragment methods - navigateFragment: navigateFragment, - prevFragment: previousFragment, - nextFragment: nextFragment, - - // Deprecated aliases - navigateTo: slide, - navigateLeft: navigateLeft, - navigateRight: navigateRight, - navigateUp: navigateUp, - navigateDown: navigateDown, - navigatePrev: navigatePrev, - navigateNext: navigateNext, - - // Forces an update in slide layout - layout: layout, - - // Randomizes the order of slides - shuffle: shuffle, - - // Returns an object with the available routes as booleans (left/right/top/bottom) - availableRoutes: availableRoutes, - - // 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, - - // Toggles the "black screen" mode on/off - togglePause: togglePause, - - // Toggles the auto slide mode on/off - toggleAutoSlide: toggleAutoSlide, - - // State checks - isOverview: isOverview, - isPaused: isPaused, - isAutoSliding: isAutoSliding, - isSpeakerNotes: isSpeakerNotes, - - // Slide preloading - loadSlide: loadSlide, - unloadSlide: unloadSlide, - - // Adds or removes all internal event listeners (such as keyboard) - addEventListeners: addEventListeners, - removeEventListeners: removeEventListeners, - - // Facility for persisting and restoring the presentation state - getState: getState, - setState: setState, - - // Presentation progress - getSlidePastCount: getSlidePastCount, - - // Presentation progress on range of 0-1 - getProgress: getProgress, - - // Returns the indices of the current, or specified, slide - getIndices: getIndices, - - // Returns an Array of all slides - getSlides: getSlides, - - // Returns the total number of slides - getTotalSlides: getTotalSlides, - - // 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 has next a 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; - }, - - // 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 ); - } - }, - - // 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; - -})); |