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-/*!
- * reveal.js
- * http://lab.hakim.se/reveal-js
- * MIT licensed
- *
- * Copyright (C) 2015 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;
-
- 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',
-
- // 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: 0.1,
-
- // Bounds for smallest/largest possible scale to apply to content
- minScale: 0.2,
- maxScale: 1.5,
-
- // Display controls in the bottom right corner
- controls: true,
-
- // Display a presentation progress bar
- progress: true,
-
- // Display the page number of the current slide
- slideNumber: false,
-
- // 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,
-
- // 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 questionmark
- // 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,
-
- // Number of milliseconds between automatically proceeding to the
- // next slide, disabled when set to 0, this value can be overwritten
- // by using a data-autoslide attribute on your slides
- autoSlide: 0,
-
- // Stop auto-sliding after user input
- autoSlideStoppable: true,
-
- // 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 visiblity 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,
-
- // Number of slides away from the current that are visible
- viewDistance: 3,
-
- // Script dependencies to load
- dependencies: []
-
- },
-
- // Flags if reveal.js is loaded (has dispatched the 'ready' event)
- loaded = false,
-
- // Flags if the overview mode is currently active
- overview = false,
-
- // The horizontal and vertical index of the currently active slide
- indexh,
- indexv,
-
- // The previous and current slide HTML elements
- previousSlide,
- currentSlide,
-
- previousBackground,
-
- // 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,
-
- // 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 ) {
-
- 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() {
-
- features.transforms3d = 'WebkitPerspective' in document.body.style ||
- 'MozPerspective' in document.body.style ||
- 'msPerspective' in document.body.style ||
- 'OPerspective' in document.body.style ||
- 'perspective' in document.body.style;
-
- features.transforms2d = 'WebkitTransform' in document.body.style ||
- 'MozTransform' in document.body.style ||
- 'msTransform' in document.body.style ||
- 'OTransform' in document.body.style ||
- 'transform' in document.body.style;
-
- features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
- features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
-
- features.canvas = !!document.createElement( 'canvas' ).getContext;
-
- features.touch = !!( 'ontouchstart' in window );
-
- // Transitions in the overview are disabled in desktop and
- // mobile Safari due to lag
- features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( navigator.userAgent );
-
- isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( navigator.userAgent );
-
- }
-
- /**
- * 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() {
-
- // Make sure we've got all the DOM elements we need
- setupDOM();
-
- // Listen to messages posted to this window
- setupPostMessage();
-
- // Prevent iframes from scrolling the slides out of view
- setupIframeScrollPrevention();
-
- // 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' );
-
- loaded = true;
-
- 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' );
-
- // 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
- createSingletonNode( dom.wrapper, 'aside', 'controls',
- '<button class="navigate-left" aria-label="previous slide"></button>' +
- '<button class="navigate-right" aria-label="next slide"></button>' +
- '<button class="navigate-up" aria-label="above slide"></button>' +
- '<button class="navigate-down" aria-label="below slide"></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', '' );
-
- // Overlay graphic which is displayed during the paused mode
- createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
-
- // Cache references to elements
- dom.controls = document.querySelector( '.reveal .controls' );
- dom.theme = document.querySelector( '#theme' );
-
- 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' ) );
-
- 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.
- */
- 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;
-
- }
-
- /**
- * 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: 0;}' );
-
- // 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';
-
- // 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 = getAbsoluteHeight( slide );
- var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
-
- // Center slides vertically
- if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
- top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
- }
-
- // Position the slide inside of the page
- slide.style.left = left + 'px';
- slide.style.top = top + 'px';
- slide.style.width = slideWidth + 'px';
-
- // TODO Backgrounds need to be multiplied when the slide
- // stretches over multiple pages
- var background = slide.querySelector( '.slide-background' );
- if( background ) {
- background.style.width = pageWidth + 'px';
- background.style.height = ( pageHeight * numberOfPages ) + 'px';
- background.style.top = -top + 'px';
- background.style.left = -left + 'px';
- }
-
- // If we're configured to `showNotes`, inject them into each slide
- if( config.showNotes ) {
- var notes = getSlideNotes( slide );
- if( notes ) {
- var notesElement = document.createElement( 'div' );
- notesElement.classList.add( 'speaker-notes' );
- notesElement.classList.add( 'speaker-notes-pdf' );
- notesElement.innerHTML = notes;
- notesElement.style.bottom = ( 40 - top ) + 'px';
- slide.appendChild( notesElement );
- }
- }
- }
-
- } );
-
- // Show all fragments
- toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
- fragment.classList.add( 'visible' );
- } );
-
- }
-
- /**
- * This is an unfortunate necessity. Iframes can trigger the
- * parent window to scroll, for example by focusing an input.
- * This scrolling can not be prevented by hiding overflow in
- * CSS so we have to resort to repeatedly checking if the
- * browser has decided to offset our slides :(
- */
- function setupIframeScrollPrevention() {
-
- if( dom.slides.querySelector( 'iframe' ) ) {
- setInterval( function() {
- if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
- dom.wrapper.scrollTop = 0;
- dom.wrapper.scrollLeft = 0;
- }
- }, 500 );
- }
-
- }
-
- /**
- * Creates an HTML element and returns a reference to it.
- * If the element already exists the existing instance will
- * be returned.
- */
- 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.classList.add( 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;
-
- if( printMode ) {
- backgroundStack = createBackground( slideh, slideh );
- }
- else {
- backgroundStack = createBackground( slideh, dom.background );
- }
-
- // Iterate over all vertical slides
- toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
-
- if( printMode ) {
- createBackground( slidev, slidev );
- }
- else {
- 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
- */
- 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.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' );
-
- // 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 computedBackgroundColor = window.getComputedStyle( element ).backgroundColor;
- if( computedBackgroundColor ) {
- var rgb = colorToRgb( computedBackgroundColor );
-
- // 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( computedBackgroundColor ) < 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.
- */
- function configure( options ) {
-
- var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
-
- dom.wrapper.classList.remove( 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 );
-
- // 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';
-
- 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.classList.add( 'visible' );
- }
- else {
- dom.speakerNotes.classList.remove( 'visible' );
- }
-
- 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();
- }
- else {
- disablePreviewLinks();
- enablePreviewLinks( '[data-preview-link]' );
- }
-
- // 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' );
- } );
- }
-
- 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( navigator.userAgent.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.
- */
- function extend( a, b ) {
-
- for( var i in b ) {
- a[ i ] = b[ i ];
- }
-
- }
-
- /**
- * Converts the target object to an array.
- */
- function toArray( o ) {
-
- return Array.prototype.slice.call( o );
-
- }
-
- /**
- * Utility for deserializing a value.
- */
- 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
- */
- 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.
- */
- 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.
- */
- 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.
- */
- 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 );
-
- }
-
- /**
- * Converts various color input formats to an {r:0,g:0,b:0} object.
- *
- * @param {String} color The string representation of a color,
- * the following formats are supported:
- * - #000
- * - #000000
- * - rgb(0,0,0)
- */
- 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 color See colorStringToRgb for supported formats.
- */
- 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;
-
- }
-
- /**
- * Retrieves the height of the given element by looking
- * at the position and height of its immediate children.
- */
- function getAbsoluteHeight( element ) {
-
- var height = 0;
-
- if( element ) {
- var absoluteChildren = 0;
-
- toArray( element.childNodes ).forEach( function( child ) {
-
- if( typeof child.offsetTop === 'number' && child.style ) {
- // Count # of abs children
- if( window.getComputedStyle( child ).position === 'absolute' ) {
- absoluteChildren += 1;
- }
-
- height = Math.max( height, child.offsetTop + child.offsetHeight );
- }
-
- } );
-
- // If there are no absolute children, use offsetHeight
- if( absoluteChildren === 0 ) {
- height = element.offsetHeight;
- }
-
- }
-
- return height;
-
- }
-
- /**
- * Returns the remaining height within the parent of the
- * target element.
- *
- * remaining height = [ configured parent height ] - [ current parent 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.
- */
- 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() {
-
- var anchors = toArray( document.querySelectorAll( '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.
- */
- 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>',
- '</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 );
-
- }
-
- /**
- * Opens a 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();
-
- var slidePadding = 20; // TODO Dig this out of DOM
-
- // Layout the contents of the slides
- layoutSlideContents( config.width, config.height, slidePadding );
-
- 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 {
- // Use zoom to scale up in desktop Chrome so that content
- // remains crisp. We don't use zoom to scale down since that
- // can lead to shifts in text layout/line breaks.
- if( scale > 1 && !isMobileDevice && /chrome/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) {
- 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 - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
- }
- }
- else {
- slide.style.top = '';
- }
-
- }
-
- updateProgress();
- updateParallax();
-
- }
-
- }
-
- /**
- * Applies layout logic to the contents of all slides in
- * the presentation.
- */
- function layoutSlideContents( width, height, padding ) {
-
- // 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.
- */
- 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 {int} v 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 );
- }
- } );
-
- 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() {
-
- var margin = 70;
- var slideWidth = config.width + margin,
- slideHeight = config.height + margin;
-
- // Reverse in RTL mode
- if( config.rtl ) {
- slideWidth = -slideWidth;
- }
-
- // Layout slides
- toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
- hslide.setAttribute( 'data-index-h', h );
- transformElement( hslide, 'translate3d(' + ( h * slideWidth ) + '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 * slideHeight ) + 'px, 0)' );
- } );
-
- }
- } );
-
- // Layout slide backgrounds
- toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
- transformElement( hbackground, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' );
-
- toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
- transformElement( vbackground, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' );
- } );
- } );
-
- }
-
- /**
- * Moves the overview viewport to the current slides.
- * Called each time the current slide changes.
- */
- function updateOverview() {
-
- var margin = 70;
- var slideWidth = config.width + margin,
- slideHeight = config.height + margin;
-
- // Reverse in RTL mode
- if( config.rtl ) {
- slideWidth = -slideWidth;
- }
-
- transformSlides( {
- overview: [
- 'translateX('+ ( -indexh * slideWidth ) +'px)',
- 'translateY('+ ( -indexv * slideHeight ) +'px)',
- 'translateZ('+ ( window.innerWidth < 400 ? -1000 : -2500 ) +'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 Optional 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 [optional] The slide to check
- * orientation of
- */
- 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.body;
-
- // 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.
- */
- function isPaused() {
-
- return dom.wrapper.classList.contains( 'paused' );
-
- }
-
- /**
- * Toggles the auto slide mode on and off.
- *
- * @param {Boolean} override Optional 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.
- */
- 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 {int} h Horizontal index of the target slide
- * @param {int} v Vertical index of the target slide
- * @param {int} f Optional index of a fragment within the
- * target slide to activate
- * @param {int} o Optional 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 );
-
- // 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 = currentSlide.textContent;
-
- 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();
- updateBackground( true );
- updateSlideNumber();
- updateSlidesVisibility();
- updateNotes();
-
- formatEmbeddedContent();
- 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' ) );
-
- } );
-
- }
-
- /**
- * 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 ) {
- showSlide( horizontalSlide );
- }
- else {
- hideSlide( 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 ) {
- showSlide( verticalSlide );
- }
- else {
- hideSlide( verticalSlide );
- }
- }
-
- }
- }
-
- }
-
- }
-
- /**
- * Pick up notes from the current slide and display tham
- * to the viewer.
- *
- * @see `showNotes` config value
- */
- function updateNotes() {
-
- if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
-
- dom.speakerNotes.innerHTML = getSlideNotes() || '';
-
- }
-
- }
-
- /**
- * 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.
- *
- * Slide number format can be defined as a string using the
- * following variables:
- * h: current slide's horizontal index
- * v: current slide's vertical index
- * c: current slide index (flattened)
- * t: total number of slides (flattened)
- */
- function updateSlideNumber() {
-
- // Update slide number if enabled
- if( config.slideNumber && dom.slideNumber) {
-
- // Default to only showing the current slide number
- var format = 'c';
-
- // Check if a custom slide number format is available
- if( typeof config.slideNumber === 'string' ) {
- format = config.slideNumber;
- }
-
- dom.slideNumber.innerHTML = format.replace( /h/g, indexh )
- .replace( /v/g, indexv )
- .replace( /c/g, getSlidePastCount() + 1 )
- .replace( /t/g, getTotalSlides() );
- }
-
- }
-
- /**
- * 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' );
- } );
-
- // Add the 'enabled' class to the available routes
- if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
- if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
- if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
- if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
-
- // Prev/next buttons
- if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
- if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
-
- // 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' ); } );
- if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
-
- // 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' ); } );
- if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
- }
- else {
- if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
- if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
- }
-
- }
-
- }
-
- /**
- * 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 any currently playing video background
- if( previousBackground ) {
-
- var previousVideo = previousBackground.querySelector( 'video' );
- if( previousVideo ) previousVideo.pause();
-
- }
-
- if( currentBackground ) {
-
- // Start video playback
- var currentVideo = currentBackground.querySelector( 'video' );
- if( currentVideo ) {
- if( currentVideo.currentTime > 0 ) currentVideo.currentTime = 0;
- currentVideo.play();
- }
-
- 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 = ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 );
- }
-
- 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 * 1 : 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).
- */
- function showSlide( slide ) {
-
- // Show the slide element
- slide.style.display = 'block';
-
- // 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.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' );
- 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' ),
- 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', '' );
- }
-
- // Support comma separated lists of video sources
- backgroundVideo.split( ',' ).forEach( function( source ) {
- video.innerHTML += '<source src="'+ source +'">';
- } );
-
- background.appendChild( video );
- }
- // Iframes
- else if( backgroundIframe ) {
- var iframe = document.createElement( 'iframe' );
- iframe.setAttribute( 'src', backgroundIframe );
- iframe.style.width = '100%';
- iframe.style.height = '100%';
- iframe.style.maxHeight = '100%';
- iframe.style.maxWidth = '100%';
-
- background.appendChild( iframe );
- }
- }
- }
-
- }
-
- /**
- * Called when the given slide is moved outside of the
- * configured view distance.
- */
- function hideSlide( 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';
- }
-
- }
-
- /**
- * Determine what available routes there are for navigation.
- *
- * @return {Object} containing four booleans: left/right/up/down
- */
- 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 {Object} two boolean properties: prev/next
- */
- 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' );
-
- }
-
- /**
- * Start playback of any embedded content inside of
- * the targeted slide.
- */
- function startEmbeddedContent( slide ) {
-
- if( slide && !isSpeakerNotes() ) {
- // Restart GIFs
- toArray( slide.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( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
- if( el.hasAttribute( 'data-autoplay' ) && typeof el.play === 'function' ) {
- el.play();
- }
- } );
-
- // Normal iframes
- toArray( slide.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
- startEmbeddedIframe( { target: el } );
- } );
-
- // Lazy loading iframes
- toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
- 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" the content of an embedded iframe using the
- * postmessage API.
- */
- function startEmbeddedIframe( event ) {
-
- var iframe = event.target;
-
- // YouTube postMessage API
- if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
- iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
- }
- // Vimeo postMessage API
- else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-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.
- */
- function stopEmbeddedContent( slide ) {
-
- if( slide && slide.parentNode ) {
- // HTML5 media elements
- toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
- if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
- el.pause();
- }
- } );
-
- // Generic postMessage API for non-lazy loaded iframes
- toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
- el.contentWindow.postMessage( 'slide:stop', '*' );
- el.removeEventListener( 'load', startEmbeddedIframe );
- });
-
- // YouTube postMessage API
- toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
- if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
- el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
- }
- });
-
- // Vimeo postMessage API
- toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
- if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
- el.contentWindow.postMessage( '{"method":"pause"}', '*' );
- }
- });
-
- // Lazy loading iframes
- toArray( slide.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.
- */
- 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.
- */
- 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.
- */
- 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 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 {Object} { h: <int>, v: <int>, f: <int> }
- */
- 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 the total number of slides in this presentation.
- */
- function getTotalSlides() {
-
- return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
-
- }
-
- /**
- * Returns the slide element matching the specified index.
- */
- 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.
- */
- function getSlideBackground( x, y ) {
-
- // When printing to PDF the slide backgrounds are nested
- // inside of the slides
- if( isPrintingPDF() ) {
- var slide = getSlide( x, y );
- if( slide ) {
- var background = slide.querySelector( '.slide-background' );
- if( background && background.parentNode === slide ) {
- return background;
- }
- }
-
- return undefined;
- }
-
- var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
- var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
-
- if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
- return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
- }
-
- return horizontalBackground;
-
- }
-
- /**
- * 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
- */
- 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.
- */
- 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()
- */
- 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.
- */
- 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 = element.textContent;
-
- if( i === index ) {
- element.classList.add( 'current-fragment' );
- }
- }
- // 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 ) {
-
- var currentFragment = currentSlide.querySelector( '.current-fragment' );
-
- var fragmentAutoSlide = currentFragment ? currentFragment.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.
- if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
- toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
- if( el.hasAttribute( 'data-autoplay' ) ) {
- if( autoSlide && el.duration * 1000 > autoSlide ) {
- autoSlide = ( el.duration * 1000 ) + 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( navigateNext, 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() {
-
- // 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() {
-
- // 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() {
-
- // Prioritize revealing fragments
- if( nextFragment() === false ) {
- if( availableRoutes().down ) {
- navigateDown();
- }
- else if( config.rtl ) {
- navigateLeft();
- }
- else {
- navigateRight();
- }
- }
-
- // If auto-sliding is enabled we need to cue up
- // another timeout
- cueAutoSlide();
-
- }
-
- /**
- * 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.
- */
- function onUserInput( event ) {
-
- if( config.autoSlideStoppable ) {
- pauseAutoSlide();
- }
-
- }
-
- /**
- * Handler for the document level 'keypress' event.
- */
- function onDocumentKeyPress( event ) {
-
- // Check if the pressed key is question mark
- if( event.shiftKey && event.charCode === 63 ) {
- if( dom.overlay ) {
- closeOverlay();
- }
- else {
- showHelp( true );
- }
- }
-
- }
-
- /**
- * Handler for the document level 'keydown' 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 );
-
- // Disregard the event if there's a focused element or a
- // keyboard modifier key is present
- if( activeElementIsCE || activeElementIsInput || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
-
- // While paused only allow resume keyboard events; 'b', '.''
- var resumeKeyCodes = [66,190,191];
- 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, period, Logitech presenter tools "black screen" button
- case 58: case 59: case 66: 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.
- */
- 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.
- */
- 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( navigator.userAgent.match( /android/gi ) ) {
- event.preventDefault();
- }
-
- }
-
- /**
- * Handler for the 'touchend' event.
- */
- function onTouchEnd( event ) {
-
- touch.captured = false;
-
- }
-
- /**
- * Convert pointer down to touch start.
- */
- 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.
- */
- 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.
- */
- 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.
- */
- function onDocumentMouseScroll( event ) {
-
- if( Date.now() - lastMouseWheelStep > 600 ) {
-
- lastMouseWheelStep = Date.now();
-
- var delta = event.detail || -event.wheelDelta;
- if( delta > 0 ) {
- navigateNext();
- }
- else {
- navigatePrev();
- }
-
- }
-
- }
-
- /**
- * Clicking on the progress bar results in a navigation to the
- * closest approximate horizontal slide using this equation:
- *
- * ( clickX / presentationWidth ) * numberOfSlides
- */
- 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.
- */
- function onWindowHashChange( event ) {
-
- readURL();
-
- }
-
- /**
- * Handler for the window level 'resize' event.
- */
- function onWindowResize( event ) {
-
- layout();
-
- }
-
- /**
- * Handle for the window level 'visibilitychange' 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.
- */
- 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.
- */
- 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.
- */
- 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 = 50;
- this.thickness = 3;
-
- // 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.context = this.canvas.getContext( '2d' );
-
- this.container.appendChild( this.canvas );
-
- this.render();
-
- }
-
- 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.diameter / 2 ) - this.thickness,
- x = this.diameter / 2,
- y = this.diameter / 2,
- iconSize = 14;
-
- // 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 + 2, 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 = '#666';
- 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 - 2, iconSize );
- this.context.fillRect( iconSize / 2 + 2, 0, iconSize / 2 - 2, iconSize );
- }
- else {
- this.context.beginPath();
- this.context.translate( 2, 0 );
- this.context.moveTo( 0, 0 );
- this.context.lineTo( iconSize - 2, 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 = {
- 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,
-
- // 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 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,
-
- // 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 on range of 0-1
- getProgress: getProgress,
-
- // Returns the indices of the current, or specified, slide
- getIndices: getIndices,
-
- 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 } );
- }
- };
-
- return Reveal;
-
-}));