import SlideContent from './controllers/slidecontent.js' import SlideNumber from './controllers/slidenumber.js' import AutoAnimate from './controllers/autoanimate.js' import Fragments from './controllers/fragments.js' import Overview from './controllers/overview.js' import Keyboard from './controllers/keyboard.js' import Location from './controllers/location.js' import Plugins from './controllers/plugins.js' import Touch from './controllers/touch.js' import Playback from './components/playback.js' import defaultConfig from './config.js' import { isMobile, isChrome, isAndroid, supportsZoom } from './utils/device.js' import { colorToRgb, colorBrightness } from './utils/color.js' import { SLIDES_SELECTOR, HORIZONTAL_SLIDES_SELECTOR, VERTICAL_SLIDES_SELECTOR, POST_MESSAGE_METHOD_BLACKLIST } from './utils/constants.js' import { extend, toArray, distanceBetween, deserialize, transformElement, createSingletonNode, createStyleSheet, closestParent, enterFullscreen, getQueryHash } from './utils/util.js' /** * reveal.js * http://revealjs.com * MIT licensed * * Copyright (C) 2020 Hakim El Hattab, https://hakim.se */ export default function( revealElement, options ) { const Reveal = {}; // The reveal.js version const VERSION = '4.0.0-dev'; // Configuration defaults, can be overridden at initialization time let config, // Flags if reveal.js is loaded (has dispatched the 'ready' event) ready = false, // The horizontal and vertical index of the currently active slide indexh, indexv, // The previous and current slide HTML elements previousSlide, currentSlide, previousBackground, // Remember which directions that the user has navigated towards hasNavigatedHorizontally = false, hasNavigatedVertically = false, // Slides may hold a data-state attribute which we pick up and apply // as a class to the body. This list contains the combined state of // all current slides. state = [], // The current scale of the presentation (see width/height config) scale = 1, // Controls loading and playback of slide content slideContent = new SlideContent( Reveal ), // Controls the optional slide number display slideNumber = new SlideNumber( Reveal ), // Controls auto-animations between slides autoAnimate = new AutoAnimate( Reveal ), // Controls navigation between slide fragments fragments = new Fragments( Reveal ), // Controls the birds-eye overview of slides overview = new Overview( Reveal ), // Controls all keyboard interactions keyboard = new Keyboard( Reveal ), // Controls the current location/URL location = new Location( Reveal ), // Controller for plugin loading plugins = new Plugins(), // Controls touch/swipe navigation for our deck touch = new Touch( Reveal ), // CSS transform that is currently applied to the slides container, // split into two groups slidesTransform = { layout: '', overview: '' }, // Cached references to DOM elements dom = {}, // List of asynchronously loaded reveal.js dependencies asyncDependencies = [], // Throttles mouse wheel navigation lastMouseWheelStep = 0, // Is the mouse pointer currently hidden from view cursorHidden = false, // Timeout used to determine when the cursor is inactive cursorInactiveTimeout = 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; /** * Starts up the presentation if the client is capable. */ function initialize() { if( !revealElement ) { console.warn( 'reveal.js can not initialize without a valid .reveal element.' ); return; } // Cache references to key DOM elements dom.wrapper = revealElement; dom.slides = revealElement.querySelector( '.slides' ); // Force a layout when the whole page, incl fonts, has loaded window.addEventListener( 'load', layout, false ); // Copy options over to our config object config = { ...defaultConfig, ...options, ...getQueryHash() }; // Load plugins then move on to #start() plugins.load( config.dependencies ).then( start ) return new Promise( resolve => Reveal.addEventListener( 'ready', resolve ) ); } /** * Starts up reveal.js by binding input events and navigating * to the current URL deeplink if there is one. */ function start() { ready = true; // Make sure we've got all the DOM elements we need setupDOM(); // Listen to messages posted to this window setupPostMessage(); // Prevent the slides from being scrolled out of view setupScrollPrevention(); // Resets all vertical slides so that only the first is visible resetVerticalSlides(); // Updates the presentation to match the current configuration values configure(); // Read the initial hash location.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( () => { // Enable transitions now that we're loaded dom.slides.classList.remove( 'no-transition' ); dom.wrapper.classList.add( 'ready' ); dispatchEvent( 'ready', { 'indexh': indexh, 'indexv': indexv, 'currentSlide': currentSlide } ); }, 1 ); // Special setup and config is required when printing to PDF if( isPrintingPDF() ) { removeEventListeners(); // The document needs to have loaded for the PDF layout // measurements to be accurate if( document.readyState === 'complete' ) { setupPDF(); } else { window.addEventListener( 'load', setupPDF ); } } } /** * Finds and stores references to DOM elements which are * required by the presentation. If a required element is * not found, it is created. */ function setupDOM() { // Prevent transitions while we're loading dom.slides.classList.add( 'no-transition' ); if( isMobile ) { dom.wrapper.classList.add( 'no-hover' ); } else { dom.wrapper.classList.remove( 'no-hover' ); } // Background element dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null ); // Progress bar dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '' ); dom.progressbar = dom.progress.querySelector( 'span' ); // Arrow controls dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls', ` ` ); // Slide number slideNumber.createElement(); // Element containing notes that are visible to the audience dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null ); dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' ); dom.speakerNotes.setAttribute( 'tabindex', '0' ); // Overlay graphic which is displayed during the paused mode dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '' : null ); dom.wrapper.setAttribute( 'role', 'application' ); // There can be multiple instances of controls throughout the page dom.controlsLeft = toArray( dom.wrapper.querySelectorAll( '.navigate-left' ) ); dom.controlsRight = toArray( dom.wrapper.querySelectorAll( '.navigate-right' ) ); dom.controlsUp = toArray( dom.wrapper.querySelectorAll( '.navigate-up' ) ); dom.controlsDown = toArray( dom.wrapper.querySelectorAll( '.navigate-down' ) ); dom.controlsPrev = toArray( dom.wrapper.querySelectorAll( '.navigate-prev' ) ); dom.controlsNext = toArray( dom.wrapper.querySelectorAll( '.navigate-next' ) ); // The left, right and down arrows in the standard reveal.js controls dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' ); dom.controlsLeftArrow = dom.controls.querySelector( '.navigate-left' ); dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' ); dom.statusElement = createStatusElement(); } /** * Creates a hidden div with role aria-live to announce the * current slide content. Hide the div off-screen to make it * available only to Assistive Technologies. * * @return {HTMLElement} */ function createStatusElement() { let statusElement = dom.wrapper.querySelector( '.aria-status' ); if( !statusElement ) { statusElement = document.createElement( 'div' ); statusElement.style.position = 'absolute'; statusElement.style.height = '1px'; statusElement.style.width = '1px'; statusElement.style.overflow = 'hidden'; statusElement.style.clip = 'rect( 1px, 1px, 1px, 1px )'; statusElement.classList.add( 'aria-status' ); statusElement.setAttribute( 'aria-live', 'polite' ); statusElement.setAttribute( 'aria-atomic','true' ); dom.wrapper.appendChild( statusElement ); } return statusElement; } /** * Announces the given text to screen readers. */ function announceStatus( value ) { dom.statusElement.textContent = value; } /** * Converts the given HTML element into a string of text * that can be announced to a screen reader. Hidden * elements are excluded. */ function getStatusText( node ) { let text = ''; // Text node if( node.nodeType === 3 ) { text += node.textContent; } // Element node else if( node.nodeType === 1 ) { let isAriaHidden = node.getAttribute( 'aria-hidden' ); let isDisplayHidden = window.getComputedStyle( node )['display'] === 'none'; if( isAriaHidden !== 'true' && !isDisplayHidden ) { toArray( node.childNodes ).forEach( child => { text += getStatusText( child ); } ); } } text = text.trim(); return text === '' ? '' : text + ' '; } /** * Configures the presentation for printing to a static * PDF. */ function setupPDF() { let slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight ); // Dimensions of the PDF pages let pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ), pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) ); // Dimensions of slides within the pages let slideWidth = slideSize.width, slideHeight = slideSize.height; // Let the browser know what page size we want to print createStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' ); // Limit the size of certain elements to the dimensions of the slide createStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' ); document.querySelector('html').classList.add( 'print-pdf' ); document.body.style.width = pageWidth + 'px'; document.body.style.height = pageHeight + 'px'; // Make sure stretch elements fit on slide layoutSlideContents( slideWidth, slideHeight ); // Compute slide numbers now, before we start duplicating slides let doingSlideNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber ); toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) { slide.setAttribute( 'data-slide-number', slideNumber.getSlideNumber( slide ) ); } ); // 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 let left = ( pageWidth - slideWidth ) / 2, top = ( pageHeight - slideHeight ) / 2; let contentHeight = slide.scrollHeight; let numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 ); // Adhere to configured pages per slide limit numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide ); // Center slides vertically if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) { top = Math.max( ( pageHeight - contentHeight ) / 2, 0 ); } // Wrap the slide in a page element and hide its overflow // so that no page ever flows onto another let page = document.createElement( 'div' ); page.className = 'pdf-page'; page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px'; slide.parentNode.insertBefore( page, slide ); page.appendChild( slide ); // Position the slide inside of the page slide.style.left = left + 'px'; slide.style.top = top + 'px'; slide.style.width = slideWidth + 'px'; if( slide.slideBackgroundElement ) { page.insertBefore( slide.slideBackgroundElement, slide ); } // Inject notes if `showNotes` is enabled if( config.showNotes ) { // Are there notes for this slide? let notes = getSlideNotes( slide ); if( notes ) { let notesSpacing = 8; let notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline'; let notesElement = document.createElement( 'div' ); notesElement.classList.add( 'speaker-notes' ); notesElement.classList.add( 'speaker-notes-pdf' ); notesElement.setAttribute( 'data-layout', notesLayout ); notesElement.innerHTML = notes; if( notesLayout === 'separate-page' ) { page.parentNode.insertBefore( notesElement, page.nextSibling ); } else { notesElement.style.left = notesSpacing + 'px'; notesElement.style.bottom = notesSpacing + 'px'; notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px'; page.appendChild( notesElement ); } } } // Inject slide numbers if `slideNumbers` are enabled if( doingSlideNumbers ) { let numberElement = document.createElement( 'div' ); numberElement.classList.add( 'slide-number' ); numberElement.classList.add( 'slide-number-pdf' ); numberElement.innerHTML = slide.getAttribute( 'data-slide-number' ); page.appendChild( numberElement ); } // Copy page and show fragments one after another if( config.pdfSeparateFragments ) { // Each fragment 'group' is an array containing one or more // fragments. Multiple fragments that appear at the same time // are part of the same group. let fragmentGroups = fragments.sort( page.querySelectorAll( '.fragment' ), true ); let previousFragmentStep; let previousPage; fragmentGroups.forEach( function( fragments ) { // Remove 'current-fragment' from the previous group if( previousFragmentStep ) { previousFragmentStep.forEach( function( fragment ) { fragment.classList.remove( 'current-fragment' ); } ); } // Show the fragments for the current index fragments.forEach( function( fragment ) { fragment.classList.add( 'visible', 'current-fragment' ); } ); // Create a separate page for the current fragment state let clonedPage = page.cloneNode( true ); page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling ); previousFragmentStep = fragments; previousPage = clonedPage; } ); // Reset the first/original page so that all fragments are hidden fragmentGroups.forEach( function( fragments ) { fragments.forEach( function( fragment ) { fragment.classList.remove( 'visible', 'current-fragment' ); } ); } ); } // Show all fragments else { toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) { fragment.classList.add( 'visible' ); } ); } } } ); // Notify subscribers that the PDF layout is good to go dispatchEvent( 'pdf-ready' ); } /** * This is an unfortunate necessity. Some actions – such as * an input field being focused in an iframe or using the * keyboard to expand text selection beyond the bounds of * a slide – can trigger our content to be pushed out of view. * This scrolling can not be prevented by hiding overflow in * CSS (we already do) so we have to resort to repeatedly * checking if the slides have been offset :( */ function setupScrollPrevention() { setInterval( () => { if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) { dom.wrapper.scrollTop = 0; dom.wrapper.scrollLeft = 0; } }, 1000 ); } /** * 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() { let 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( slideh => { let backgroundStack = createBackground( slideh, dom.background ); // Iterate over all vertical slides toArray( slideh.querySelectorAll( 'section' ) ).forEach( slidev => { createBackground( slidev, backgroundStack ); backgroundStack.classList.add( 'stack' ); } ); } ); // Add parallax background if specified if( config.parallaxBackgroundImage ) { dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")'; dom.background.style.backgroundSize = config.parallaxBackgroundSize; dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat; dom.background.style.backgroundPosition = config.parallaxBackgroundPosition; // Make sure the below properties are set on the element - these properties are // needed for proper transitions to be set on the element via CSS. To remove // annoying background slide-in effect when the presentation starts, apply // these properties after short time delay setTimeout( () => { dom.wrapper.classList.add( 'has-parallax-background' ); }, 1 ); } else { dom.background.style.backgroundImage = ''; dom.wrapper.classList.remove( 'has-parallax-background' ); } } /** * Creates a background for the given slide. * * @param {HTMLElement} slide * @param {HTMLElement} container The element that the background * should be appended to * @return {HTMLElement} New background div */ function createBackground( slide, container ) { // Main slide background element let element = document.createElement( 'div' ); element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' ); // Inner background element that wraps images/videos/iframes let contentElement = document.createElement( 'div' ); contentElement.className = 'slide-background-content'; element.appendChild( contentElement ); container.appendChild( element ); slide.slideBackgroundElement = element; slide.slideBackgroundContentElement = contentElement; // Syncs the background to reflect all current background settings syncBackground( slide ); return element; } /** * Renders all of the visual properties of a slide background * based on the various background attributes. * * @param {HTMLElement} slide */ function syncBackground( slide ) { let element = slide.slideBackgroundElement, contentElement = slide.slideBackgroundContentElement; // Reset the prior background state in case this is not the // initial sync slide.classList.remove( 'has-dark-background' ); slide.classList.remove( 'has-light-background' ); element.removeAttribute( 'data-loaded' ); element.removeAttribute( 'data-background-hash' ); element.removeAttribute( 'data-background-size' ); element.removeAttribute( 'data-background-transition' ); element.style.backgroundColor = ''; contentElement.style.backgroundSize = ''; contentElement.style.backgroundRepeat = ''; contentElement.style.backgroundPosition = ''; contentElement.style.backgroundImage = ''; contentElement.style.opacity = ''; contentElement.innerHTML = ''; let data = { background: slide.getAttribute( 'data-background' ), backgroundSize: slide.getAttribute( 'data-background-size' ), backgroundImage: slide.getAttribute( 'data-background-image' ), backgroundVideo: slide.getAttribute( 'data-background-video' ), backgroundIframe: slide.getAttribute( 'data-background-iframe' ), backgroundColor: slide.getAttribute( 'data-background-color' ), backgroundRepeat: slide.getAttribute( 'data-background-repeat' ), backgroundPosition: slide.getAttribute( 'data-background-position' ), backgroundTransition: slide.getAttribute( 'data-background-transition' ), backgroundOpacity: slide.getAttribute( 'data-background-opacity' ) }; if( data.background ) { // Auto-wrap image urls in url(...) if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/gi.test( data.background ) ) { slide.setAttribute( 'data-background-image', data.background ); } else { element.style.background = data.background; } } // Create a hash for this combination of background settings. // This is used to determine when two slide backgrounds are // the same. if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) { element.setAttribute( 'data-background-hash', data.background + data.backgroundSize + data.backgroundImage + data.backgroundVideo + data.backgroundIframe + data.backgroundColor + data.backgroundRepeat + data.backgroundPosition + data.backgroundTransition + data.backgroundOpacity ); } // Additional and optional background properties if( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize ); if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor; if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition ); if( slide.hasAttribute( 'data-preload' ) ) element.setAttribute( 'data-preload', '' ); // Background image options are set on the content wrapper if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize; if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat; if( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition; if( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity; // If this slide has a background color, we add a class that // signals if it is light or dark. If the slide has no background // color, no class will be added let contrastColor = data.backgroundColor; // If no bg color was found, check the computed background if( !contrastColor ) { let computedBackgroundStyle = window.getComputedStyle( element ); if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) { contrastColor = computedBackgroundStyle.backgroundColor; } } if( contrastColor ) { let rgb = colorToRgb( contrastColor ); // 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( contrastColor ) < 128 ) { slide.classList.add( 'has-dark-background' ); } else { slide.classList.add( 'has-light-background' ); } } } } /** * Registers a listener to postMessage events, this makes it * possible to call all reveal.js API methods from another * window. For example: * * revealWindow.postMessage( JSON.stringify({ * method: 'slide', * args: [ 2 ] * }), '*' ); */ function setupPostMessage() { if( config.postMessage ) { window.addEventListener( 'message', event => { let 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' ) { if( POST_MESSAGE_METHOD_BLACKLIST.test( data.method ) === false ) { const result = Reveal[data.method].apply( Reveal, data.args ); // Dispatch a postMessage event with the returned value from // our method invocation for getter functions dispatchPostMessage( 'callback', { method: data.method, result: result } ); } else { console.warn( 'reveal.js: "'+ data.method +'" is is blacklisted from the postMessage API' ); } } } }, false ); } } /** * Applies the configuration settings from the config * object. May be called multiple times. * * @param {object} options */ function configure( options ) { const oldTransition = config.transition; // New config options may be passed when this method // is invoked through the API after initialization if( typeof options === 'object' ) extend( config, options ); // Abort if reveal.js hasn't finished loading, config // changes will be applied automatically once ready if( Reveal.isReady() === false ) return; const numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length; // The transition is added as a class on the .reveal element dom.wrapper.classList.remove( oldTransition ); dom.wrapper.classList.add( config.transition ); dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed ); dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition ); dom.controls.style.display = config.controls ? 'block' : 'none'; dom.progress.style.display = config.progress ? 'block' : 'none'; dom.controls.setAttribute( 'data-controls-layout', config.controlsLayout ); dom.controls.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows ); if( config.shuffle ) { shuffle(); } if( config.rtl ) { dom.wrapper.classList.add( 'rtl' ); } else { dom.wrapper.classList.remove( 'rtl' ); } if( config.center ) { dom.wrapper.classList.add( 'center' ); } else { dom.wrapper.classList.remove( 'center' ); } // Exit the paused mode if it was configured off if( config.pause === false ) { resume(); } if( config.showNotes ) { dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' ); } if( config.mouseWheel ) { document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF document.addEventListener( 'mousewheel', onDocumentMouseScroll, false ); } else { document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false ); } // Auto-hide the mouse pointer when its inactive if( config.hideInactiveCursor ) { document.addEventListener( 'mousemove', onDocumentCursorActive, false ); document.addEventListener( 'mousedown', onDocumentCursorActive, false ); } else { showCursor(); document.removeEventListener( 'mousemove', onDocumentCursorActive, false ); document.removeEventListener( 'mousedown', onDocumentCursorActive, false ); } // Iframe link previews if( config.previewLinks ) { enablePreviewLinks(); disablePreviewLinks( '[data-preview-link=false]' ); } else { disablePreviewLinks(); enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' ); } // Reset all changes made by auto-animations autoAnimate.reset(); // Remove existing auto-slide controls if( autoSlidePlayer ) { autoSlidePlayer.destroy(); autoSlidePlayer = null; } // Generate auto-slide controls if needed if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable ) { autoSlidePlayer = new Playback( dom.wrapper, () => { 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 ) { fragments.showAll(); } // Add the navigation mode to the DOM so we can adjust styling if( config.navigationMode !== 'default' ) { dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode ); } else { dom.wrapper.removeAttribute( 'data-navigation-mode' ); } slideNumber.refreshVisibility(); keyboard.refreshSortcuts(); sync(); } /** * Binds all event listeners. */ function addEventListeners() { eventsAreBound = true; window.addEventListener( 'hashchange', onWindowHashChange, false ); window.addEventListener( 'resize', onWindowResize, false ); if( config.touch ) { touch.bind(); } if( config.keyboard ) { keyboard.bind(); } if( config.progress && dom.progress ) { dom.progress.addEventListener( 'click', onProgressClicked, false ); } dom.pauseOverlay.addEventListener( 'click', resume, false ); if( config.focusBodyOnPageVisibilityChange ) { document.addEventListener( 'visibilitychange', onPageVisibilityChange, false ); } // Listen to both touch and click events, in case the device // supports both let pointerEvents = [ 'touchstart', 'click' ]; // Only support touch for Android, fixes double navigations in // stock browser if( isAndroid ) { pointerEvents = [ 'touchstart' ]; } pointerEvents.forEach( eventName => { dom.controlsLeft.forEach( el => el.addEventListener( eventName, onNavigateLeftClicked, false ) ); dom.controlsRight.forEach( el => el.addEventListener( eventName, onNavigateRightClicked, false ) ); dom.controlsUp.forEach( el => el.addEventListener( eventName, onNavigateUpClicked, false ) ); dom.controlsDown.forEach( el => el.addEventListener( eventName, onNavigateDownClicked, false ) ); dom.controlsPrev.forEach( el => el.addEventListener( eventName, onNavigatePrevClicked, false ) ); dom.controlsNext.forEach( el => el.addEventListener( eventName, onNavigateNextClicked, false ) ); } ); } /** * Unbinds all event listeners. */ function removeEventListeners() { eventsAreBound = false; touch.unbind(); keyboard.unbind(); window.removeEventListener( 'hashchange', onWindowHashChange, false ); window.removeEventListener( 'resize', onWindowResize, false ); dom.pauseOverlay.removeEventListener( 'click', resume, false ); if ( config.progress && dom.progress ) { dom.progress.removeEventListener( 'click', onProgressClicked, false ); } [ 'touchstart', 'click' ].forEach( eventName => { dom.controlsLeft.forEach( el => el.removeEventListener( eventName, onNavigateLeftClicked, false ) ); dom.controlsRight.forEach( el => el.removeEventListener( eventName, onNavigateRightClicked, false ) ); dom.controlsUp.forEach( el => el.removeEventListener( eventName, onNavigateUpClicked, false ) ); dom.controlsDown.forEach( el => el.removeEventListener( eventName, onNavigateDownClicked, false ) ); dom.controlsPrev.forEach( el => el.removeEventListener( eventName, onNavigatePrevClicked, false ) ); dom.controlsNext.forEach( el => el.removeEventListener( eventName, onNavigateNextClicked, false ) ); } ); } /** * Applies CSS transforms to the slides container. The container * is transformed from two separate sources: layout and the overview * mode. * * @param {object} transforms */ function transformSlides( transforms ) { // Pick up new transforms from arguments if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout; if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview; // Apply the transforms to the slides container if( slidesTransform.layout ) { transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview ); } else { transformElement( dom.slides, slidesTransform.overview ); } } /** * Returns the remaining height within the parent of the * target element. * * remaining height = [ configured parent height ] - [ current parent height ] * * @param {HTMLElement} element * @param {number} [height] */ function getRemainingHeight( element, height = 0 ) { if( element ) { let 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'; // In Overview mode, the parent (.slide) height is set of 700px. // Restore it temporarily to its natural height. element.parentNode.style.height = 'auto'; newHeight = height - element.parentNode.offsetHeight; // Restore the old height, just in case element.style.height = oldHeight + 'px'; // Clear the parent (.slide) height. .removeProperty works in IE9+ element.parentNode.style.removeProperty('height'); 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 ); } /** * Dispatches an event of the specified type from the * reveal DOM element. */ function dispatchEvent( type, args ) { let 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 dispatchPostMessage( type ); } /** * Dispatched a postMessage of the given type from our window. */ function dispatchPostMessage( type, data ) { if( config.postMessageEvents && window.parent !== window.self ) { let message = { namespace: 'reveal', eventName: type, state: getState() }; extend( message, data ); window.parent.postMessage( JSON.stringify( message ), '*' ); } } /** * Bind preview frame links. * * @param {string} [selector=a] - selector for anchors */ function enablePreviewLinks( selector = 'a' ) { toArray( dom.wrapper.querySelectorAll( selector ) ).forEach( element => { if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) { element.addEventListener( 'click', onPreviewLinkClicked, false ); } } ); } /** * Unbind preview frame links. */ function disablePreviewLinks( selector = 'a' ) { toArray( dom.wrapper.querySelectorAll( selector ) ).forEach( element => { if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) { element.removeEventListener( 'click', onPreviewLinkClicked, false ); } } ); } /** * Opens a preview window for the target URL. * * @param {string} url - url for preview iframe src */ function showPreview( url ) { closeOverlay(); dom.overlay = document.createElement( 'div' ); dom.overlay.classList.add( 'overlay' ); dom.overlay.classList.add( 'overlay-preview' ); dom.wrapper.appendChild( dom.overlay ); dom.overlay.innerHTML = `
Unable to load iframe. This is likely due to the site's policy (x-frame-options).
`; dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', event => { dom.overlay.classList.add( 'loaded' ); }, false ); dom.overlay.querySelector( '.close' ).addEventListener( 'click', event => { closeOverlay(); event.preventDefault(); }, false ); dom.overlay.querySelector( '.external' ).addEventListener( 'click', event => { closeOverlay(); }, false ); } /** * Open or close help overlay window. * * @param {Boolean} [override] Flag which overrides the * toggle logic and forcibly sets the desired state. True means * help is open, false means it's closed. */ function toggleHelp( override ){ if( typeof override === 'boolean' ) { override ? showHelp() : closeOverlay(); } else { if( dom.overlay ) { closeOverlay(); } else { showHelp(); } } } /** * Opens an overlay window with help material. */ function showHelp() { if( config.help ) { closeOverlay(); dom.overlay = document.createElement( 'div' ); dom.overlay.classList.add( 'overlay' ); dom.overlay.classList.add( 'overlay-help' ); dom.wrapper.appendChild( dom.overlay ); let html = '

Keyboard Shortcuts


'; html += ''; for( let key in keyboard.shortcuts ) { html += ``; } // Add custom key bindings that have associated descriptions for( let binding in keyboard.registeredKeyBindings ) { if( keyboard.registeredKeyBindings[binding].key && keyboard.registeredKeyBindings[binding].description ) { html += ``; } } html += '
KEYACTION
${key}${keyboard.shortcuts[ key ]}
${keyboard.registeredKeyBindings[binding].key}${keyboard.registeredKeyBindings[binding].description}
'; dom.overlay.innerHTML = `
${html}
`; dom.overlay.querySelector( '.close' ).addEventListener( 'click', event => { closeOverlay(); event.preventDefault(); }, false ); } } /** * Closes any currently open overlay. */ function closeOverlay() { if( dom.overlay ) { dom.overlay.parentNode.removeChild( dom.overlay ); dom.overlay = null; return true; } return false; } /** * Applies JavaScript-controlled layout rules to the * presentation. */ function layout() { if( dom.wrapper && !isPrintingPDF() ) { if( !config.disableLayout ) { // On some mobile devices '100vh' is taller than the visible // viewport which leads to part of the presentation being // cut off. To work around this we define our own '--vh' custom // property where 100x adds up to the correct height. // // https://css-tricks.com/the-trick-to-viewport-units-on-mobile/ if( isMobile ) { document.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' ); } const size = getComputedSlideSize(); const oldScale = scale; // Layout the contents of the slides layoutSlideContents( config.width, config.height ); dom.slides.style.width = size.width + 'px'; dom.slides.style.height = size.height + 'px'; // Determine scale of content to fit within available space scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height ); // Respect max/min scale settings scale = Math.max( scale, config.minScale ); scale = Math.min( scale, config.maxScale ); // Don't apply any scaling styles if scale is 1 if( scale === 1 ) { dom.slides.style.zoom = ''; dom.slides.style.left = ''; dom.slides.style.top = ''; dom.slides.style.bottom = ''; dom.slides.style.right = ''; transformSlides( { layout: '' } ); } else { // Zoom Scaling // Content remains crisp no matter how much we scale. Side // effects are minor differences in text layout and iframe // viewports changing size. A 200x200 iframe viewport in a // 2x zoomed presentation ends up having a 400x400 viewport. if( scale > 1 && supportsZoom && window.devicePixelRatio < 2 ) { dom.slides.style.zoom = scale; dom.slides.style.left = ''; dom.slides.style.top = ''; dom.slides.style.bottom = ''; dom.slides.style.right = ''; transformSlides( { layout: '' } ); } // Transform Scaling // Content layout remains the exact same when scaled up. // Side effect is content becoming blurred, especially with // high scale values on ldpi screens. 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 const slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ); for( let i = 0, len = slides.length; i < len; i++ ) { const slide = slides[ i ]; // Don't bother updating invisible slides if( slide.style.display === 'none' ) { continue; } if( config.center || slide.classList.contains( 'center' ) ) { // Vertical stacks are not centred since their section // children will be if( slide.classList.contains( 'stack' ) ) { slide.style.top = 0; } else { slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px'; } } else { slide.style.top = ''; } } if( oldScale !== scale ) { dispatchEvent( 'resize', { 'oldScale': oldScale, 'scale': scale, 'size': size } ); } } updateProgress(); updateParallax(); if( overview.isActive() ) { overview.update(); } } } /** * Applies layout logic to the contents of all slides in * the presentation. * * @param {string|number} width * @param {string|number} height */ function layoutSlideContents( width, height ) { // Handle sizing of elements with the 'stretch' class toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( element => { // Determine how much vertical space we can use let remainingHeight = getRemainingHeight( element, height ); // Consider the aspect ratio of media elements if( /(img|video)/gi.test( element.nodeName ) ) { const nw = element.naturalWidth || element.videoWidth, nh = element.naturalHeight || element.videoHeight; const es = Math.min( width / nw, remainingHeight / nh ); element.style.width = ( nw * es ) + 'px'; element.style.height = ( nh * es ) + 'px'; } else { element.style.width = width + 'px'; element.style.height = remainingHeight + 'px'; } } ); } /** * Calculates the computed pixel size of our slides. These * values are based on the width and height configuration * options. * * @param {number} [presentationWidth=dom.wrapper.offsetWidth] * @param {number} [presentationHeight=dom.wrapper.offsetHeight] */ function getComputedSlideSize( presentationWidth, presentationHeight ) { const size = { // Slide size width: config.width, height: config.height, // Presentation size presentationWidth: presentationWidth || dom.wrapper.offsetWidth, presentationHeight: presentationHeight || dom.wrapper.offsetHeight }; // Reduce available space by margin size.presentationWidth -= ( size.presentationWidth * config.margin ); size.presentationHeight -= ( size.presentationHeight * config.margin ); // Slide width may be a percentage of available width if( typeof size.width === 'string' && /%$/.test( size.width ) ) { size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth; } // Slide height may be a percentage of available height if( typeof size.height === 'string' && /%$/.test( size.height ) ) { size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight; } return size; } /** * Stores the vertical index of a stack so that the same * vertical slide can be selected when navigating to and * from the stack. * * @param {HTMLElement} stack The vertical stack element * @param {string|number} [v=0] Index to memorize */ function setPreviousVerticalIndex( stack, v ) { if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) { stack.setAttribute( 'data-previous-indexv', v || 0 ); } } /** * Retrieves the vertical index which was stored using * #setPreviousVerticalIndex() or 0 if no previous index * exists. * * @param {HTMLElement} stack The vertical stack element */ function getPreviousVerticalIndex( stack ) { if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) { // Prefer manually defined start-indexv const attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv'; return parseInt( stack.getAttribute( attributeName ) || 0, 10 ); } return 0; } /** * Checks if the current or specified slide is vertical * (nested within another slide). * * @param {HTMLElement} [slide=currentSlide] The slide to check * orientation of * @return {Boolean} */ function isVerticalSlide( slide = currentSlide ) { return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i ); } /** * Returns true if we're on the last slide in the current * vertical stack. */ function isLastVerticalSlide() { if( currentSlide && isVerticalSlide( currentSlide ) ) { // Does this slide have a next sibling? if( currentSlide.nextElementSibling ) return false; return true; } return false; } /** * Returns true if we're currently on the first slide in * the presentation. */ function isFirstSlide() { return indexh === 0 && indexv === 0; } /** * Returns true if we're currently on the last slide in * the presenation. If the last slide is a stack, we only * consider this the last slide if it's at the end of the * stack. */ function isLastSlide() { if( currentSlide ) { // Does this slide have a next sibling? if( currentSlide.nextElementSibling ) return false; // If it's vertical, does its parent have a next sibling? if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false; return true; } return false; } /** * Shows the mouse pointer after it has been hidden with * #hideCursor. */ function showCursor() { if( cursorHidden ) { cursorHidden = false; dom.wrapper.style.cursor = ''; } } /** * Hides the mouse pointer when it's on top of the .reveal * container. */ function hideCursor() { if( cursorHidden === false ) { cursorHidden = true; dom.wrapper.style.cursor = 'none'; } } /** * Enters the paused mode which fades everything on screen to * black. */ function pause() { if( config.pause ) { const wasPaused = dom.wrapper.classList.contains( 'paused' ); cancelAutoSlide(); dom.wrapper.classList.add( 'paused' ); if( wasPaused === false ) { dispatchEvent( 'paused' ); } } } /** * Exits from the paused mode. */ function resume() { const wasPaused = dom.wrapper.classList.contains( 'paused' ); dom.wrapper.classList.remove( 'paused' ); cueAutoSlide(); if( wasPaused ) { dispatchEvent( 'resumed' ); } } /** * Toggles the paused mode on and off. */ function togglePause( override ) { if( typeof override === 'boolean' ) { override ? pause() : resume(); } else { isPaused() ? resume() : pause(); } } /** * Checks if we are currently in the paused mode. * * @return {Boolean} */ function isPaused() { return dom.wrapper.classList.contains( 'paused' ); } /** * Toggles the auto slide mode on and off. * * @param {Boolean} [override] Flag which sets the desired state. * True means autoplay starts, false means it stops. */ function toggleAutoSlide( override ) { if( typeof override === 'boolean' ) { override ? resumeAutoSlide() : pauseAutoSlide(); } else { autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide(); } } /** * Checks if the auto slide mode is currently on. * * @return {Boolean} */ function isAutoSliding() { return !!( autoSlide && !autoSlidePaused ); } /** * Steps from the current point in the presentation to the * slide which matches the specified horizontal and vertical * indices. * * @param {number} [h=indexh] Horizontal index of the target slide * @param {number} [v=indexv] Vertical index of the target slide * @param {number} [f] Index of a fragment within the * target slide to activate * @param {number} [o] Origin for use in multimaster environments */ function slide( h, v, f, o ) { // Remember where we were at before previousSlide = currentSlide; // Query all horizontal slides in the deck const horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ); // Abort if there are no slides if( horizontalSlides.length === 0 ) return; // If no vertical index is specified and the upcoming slide is a // stack, resume at its previous vertical index if( v === undefined && !overview.isActive() ) { 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 const stateBefore = state.concat(); // Reset the state array state.length = 0; let 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(); // Update the overview if it's currently active if( overview.isActive() ) { overview.update(); } // Find the current horizontal slide and any possible vertical slides // within it let 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' ) { fragments.goto( f ); } // Dispatch an event if the slide changed let slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore ); if (!slideChanged) { // Ensure that the previous slide is never the same as the current previousSlide = null; } // Solves an edge case where the previous slide maintains the // 'present' class when navigating between adjacent vertical // stacks if( previousSlide && previousSlide !== currentSlide ) { previousSlide.classList.remove( 'present' ); previousSlide.setAttribute( 'aria-hidden', 'true' ); // Reset all slides upon navigate to home if( isFirstSlide() ) { // Launch async task setTimeout( () => { getVerticalStacks().forEach( slide => { setPreviousVerticalIndex( slide, 0 ); } ); }, 0 ); } } // Apply the new state stateLoop: for( let 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( let 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() ); } if( slideChanged ) { dispatchEvent( 'slidechanged', { 'indexh': indexh, 'indexv': indexv, 'previousSlide': previousSlide, 'currentSlide': currentSlide, 'origin': o } ); } // Handle embedded content if( slideChanged || !previousSlide ) { slideContent.stopEmbeddedContent( previousSlide ); slideContent.startEmbeddedContent( currentSlide ); } // Announce the current slide contents to screen readers announceStatus( getStatusText( currentSlide ) ); updateControls(); updateProgress(); updateBackground(); updateParallax(); updateNotes(); slideNumber.update(); fragments.update(); // Update the URL hash location.writeURL(); cueAutoSlide(); // Auto-animation if( slideChanged && previousSlide && currentSlide && !overview.isActive() ) { // Skip the slide transition between our two slides // when auto-animating individual elements if( previousSlide.hasAttribute( 'data-auto-animate' ) && currentSlide.hasAttribute( 'data-auto-animate' ) ) { dom.slides.classList.add( 'disable-slide-transitions' ); setTimeout( () => { dom.slides.classList.remove( 'disable-slide-transitions' ); }, 0 ); if( config.autoAnimate ) { // Run the auto-animation between our slides autoAnimate.run( previousSlide, currentSlide ); } } } } /** * 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 location.writeURL(); fragments.sortAll(); updateControls(); updateProgress(); updateSlidesVisibility(); updateBackground( true ); updateNotesVisibility(); updateNotes(); slideNumber.update(); slideContent.formatEmbeddedContent(); // Start or stop embedded content depending on global config if( config.autoPlayMedia === false ) { slideContent.stopEmbeddedContent( currentSlide, { unloadIframes: false } ); } else { slideContent.startEmbeddedContent( currentSlide ); } if( overview.isActive() ) { overview.layout(); } } /** * Updates reveal.js to keep in sync with new slide attributes. For * example, if you add a new `data-background-image` you can call * this to have reveal.js render the new background image. * * Similar to #sync() but more efficient when you only need to * refresh a specific slide. * * @param {HTMLElement} slide */ function syncSlide( slide = currentSlide ) { syncBackground( slide ); syncFragments( slide ); slideContent.load( slide ); updateBackground(); updateNotes(); } /** * Formats the fragments on the given slide so that they have * valid indices. Call this if fragments are changed in the DOM * after reveal.js has already initialized. * * @param {HTMLElement} slide * @return {Array} a list of the HTML fragments that were synced */ function syncFragments( slide = currentSlide ) { return config.sort( slide.querySelectorAll( '.fragment' ) ); } /** * Resets all vertical slides so that only the first * is visible. */ function resetVerticalSlides() { getHorizontalSlides().forEach( horizontalSlide => { toArray( horizontalSlide.querySelectorAll( 'section' ) ).forEach( ( verticalSlide, y ) => { if( y > 0 ) { verticalSlide.classList.remove( 'present' ); verticalSlide.classList.remove( 'past' ); verticalSlide.classList.add( 'future' ); verticalSlide.setAttribute( 'aria-hidden', 'true' ); } } ); } ); } /** * Randomly shuffles all slides in the deck. */ function shuffle() { getHorizontalSlides().forEach( ( slide, i, slides ) => { // Insert this slide next to another random slide. This may // cause the slide to insert before itself but that's fine. dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] ); } ); } /** * Updates one dimension of slides by showing the slide * with the specified index. * * @param {string} selector A CSS selector that will fetch * the group of slides we are working with * @param {number} index The index of the slide that should be * shown * * @return {number} The index of the slide that is now shown, * might differ from the passed in index if it was out of * bounds. */ function updateSlides( selector, index ) { // Select all slides and convert the NodeList result to // an array let slides = toArray( dom.wrapper.querySelectorAll( selector ) ), slidesLength = slides.length; let 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( let i = 0; i < slidesLength; i++ ) { let element = slides[i]; let reverse = config.rtl && !isVerticalSlide( element ); element.classList.remove( 'past', 'present', '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 ) { // Show all fragments in prior slides toArray( element.querySelectorAll( '.fragment' ) ).forEach( fragment => { fragment.classList.add( 'visible' ); fragment.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 ) { // Hide all fragments in future slides toArray( element.querySelectorAll( '.fragment.visible' ) ).forEach( fragment => { fragment.classList.remove( 'visible', '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 let 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 let horizontalSlides = getHorizontalSlides(), horizontalSlidesLength = horizontalSlides.length, distanceX, distanceY; if( horizontalSlidesLength && typeof indexh !== 'undefined' ) { // The number of steps away from the present slide that will // be visible let viewDistance = overview.isActive() ? 10 : config.viewDistance; // Shorten the view distance on devices that typically have // less resources if( isMobile ) { viewDistance = overview.isActive() ? 6 : config.mobileViewDistance; } // All slides need to be visible when exporting to PDF if( isPrintingPDF() ) { viewDistance = Number.MAX_VALUE; } for( let x = 0; x < horizontalSlidesLength; x++ ) { let horizontalSlide = horizontalSlides[x]; let 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 ) { slideContent.load( horizontalSlide ); } else { slideContent.unload( horizontalSlide ); } if( verticalSlidesLength ) { let oy = getPreviousVerticalIndex( horizontalSlide ); for( let y = 0; y < verticalSlidesLength; y++ ) { let verticalSlide = verticalSlides[y]; distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy ); if( distanceX + distanceY < viewDistance ) { slideContent.load( verticalSlide ); } else { slideContent.unload( verticalSlide ); } } } } // Flag if there are ANY vertical slides, anywhere in the deck if( hasVerticalSlides() ) { dom.wrapper.classList.add( 'has-vertical-slides' ); } else { dom.wrapper.classList.remove( 'has-vertical-slides' ); } // Flag if there are ANY horizontal slides, anywhere in the deck if( hasHorizontalSlides() ) { dom.wrapper.classList.add( 'has-horizontal-slides' ); } else { dom.wrapper.classList.remove( 'has-horizontal-slides' ); } } } /** * Pick up notes from the current slide and display them * to the viewer. * * @see {@link config.showNotes} */ function updateNotes() { if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) { dom.speakerNotes.innerHTML = getSlideNotes() || 'No notes on this slide.'; } } /** * Updates the visibility of the speaker notes sidebar that * is used to share annotated slides. The notes sidebar is * only visible if showNotes is true and there are notes on * one or more slides in the deck. */ function updateNotesVisibility() { if( config.showNotes && hasNotes() ) { dom.wrapper.classList.add( 'show-notes' ); } else { dom.wrapper.classList.remove( 'show-notes' ); } } /** * Checks if there are speaker notes for ANY slide in the * presentation. */ function hasNotes() { return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0; } /** * Updates the progress bar to reflect the current slide. */ function updateProgress() { // Update progress if enabled if( config.progress && dom.progressbar ) { dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px'; } } /** * Updates the state of all control/navigation arrows. */ function updateControls() { let routes = availableRoutes(); let fragmentsRoutes = fragments.availableRoutes(); // Remove the 'enabled' class from all directions [...dom.controlsLeft, ...dom.controlsRight, ...dom.controlsUp, ...dom.controlsDown, ...dom.controlsPrev, ...dom.controlsNext].forEach( node => { node.classList.remove( 'enabled', 'fragmented' ); // Set 'disabled' attribute on all directions node.setAttribute( 'disabled', 'disabled' ); } ); // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons if( routes.left ) dom.controlsLeft.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( routes.right ) dom.controlsRight.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( routes.up ) dom.controlsUp.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( routes.down ) dom.controlsDown.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); // Prev/next buttons if( routes.left || routes.up ) dom.controlsPrev.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( routes.right || routes.down ) dom.controlsNext.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); // Highlight fragment directions if( currentSlide ) { // Always apply fragment decorator to prev/next buttons if( fragmentsRoutes.prev ) dom.controlsPrev.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( fragmentsRoutes.next ) dom.controlsNext.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); // Apply fragment decorators to directional buttons based on // what slide axis they are in if( isVerticalSlide( currentSlide ) ) { if( fragmentsRoutes.prev ) dom.controlsUp.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( fragmentsRoutes.next ) dom.controlsDown.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); } else { if( fragmentsRoutes.prev ) dom.controlsLeft.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); if( fragmentsRoutes.next ) dom.controlsRight.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); } } if( config.controlsTutorial ) { // Highlight control arrows with an animation to ensure // that the viewer knows how to navigate if( !hasNavigatedVertically && routes.down ) { dom.controlsDownArrow.classList.add( 'highlight' ); } else { dom.controlsDownArrow.classList.remove( 'highlight' ); if( config.rtl ) { if( !hasNavigatedHorizontally && routes.left && indexv === 0 ) { dom.controlsLeftArrow.classList.add( 'highlight' ); } else { dom.controlsLeftArrow.classList.remove( 'highlight' ); } } else { if( !hasNavigatedHorizontally && routes.right && indexv === 0 ) { dom.controlsRightArrow.classList.add( 'highlight' ); } else { dom.controlsRightArrow.classList.remove( 'highlight' ); } } } } } /** * Updates the background elements to reflect the current * slide. * * @param {boolean} includeAll If true, the backgrounds of * all vertical slides (not just the present) will be updated. */ function updateBackground( includeAll = false ) { let currentBackground = null; // Reverse past/future classes when in RTL mode let 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( ( backgroundh, h ) => { backgroundh.classList.remove( 'past', 'present', '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( ( backgroundv, v ) => { backgroundv.classList.remove( 'past', 'present', 'future' ); if( v < indexv ) { backgroundv.classList.add( 'past' ); } else if ( v > indexv ) { backgroundv.classList.add( 'future' ); } else { backgroundv.classList.add( 'present' ); // Only if this is the present horizontal and vertical slide if( h === indexh ) currentBackground = backgroundv; } } ); } } ); // Stop content inside of previous backgrounds if( previousBackground ) { slideContent.stopEmbeddedContent( previousBackground, { unloadIframes: !slideContent.shouldPreload( previousBackground ) } ); } // Start content in the current background if( currentBackground ) { slideContent.startEmbeddedContent( currentBackground ); let currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' ); if( currentBackgroundContent ) { let backgroundImageURL = currentBackgroundContent.style.backgroundImage || ''; // Restart GIFs (doesn't work in Firefox) if( /\.gif/i.test( backgroundImageURL ) ) { currentBackgroundContent.style.backgroundImage = ''; window.getComputedStyle( currentBackgroundContent ).opacity; currentBackgroundContent.style.backgroundImage = backgroundImageURL; } } // Don't transition between identical backgrounds. This // prevents unwanted flicker. let previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null; let 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( 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( () => { 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 ) { let horizontalSlides = getHorizontalSlides(), verticalSlides = getVerticalSlides(); let 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 ); } let slideWidth = dom.background.offsetWidth, horizontalSlideCount = horizontalSlides.length, horizontalOffsetMultiplier, horizontalOffset; if( typeof config.parallaxBackgroundHorizontal === 'number' ) { horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal; } else { horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0; } horizontalOffset = horizontalOffsetMultiplier * indexh * -1; let slideHeight = dom.background.offsetHeight, verticalSlideCount = verticalSlides.length, verticalOffsetMultiplier, verticalOffset; if( typeof config.parallaxBackgroundVertical === 'number' ) { verticalOffsetMultiplier = config.parallaxBackgroundVertical; } else { verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ); } verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0; dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px'; } } /** * Determine what available routes there are for navigation. * * @return {{left: boolean, right: boolean, up: boolean, down: boolean}} */ function availableRoutes() { let horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ), verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR ); let routes = { left: indexh > 0, right: indexh < horizontalSlides.length - 1, up: indexv > 0, down: indexv < verticalSlides.length - 1 }; // Looped presentations can always be navigated as long as // there are slides available if( config.loop ) { if( horizontalSlides.length > 1 ) { routes.left = true; routes.right = true; } if( verticalSlides.length > 1 ) { routes.up = true; routes.down = true; } } if ( horizontalSlides.length > 1 && config.navigationMode === 'linear' ) { routes.right = routes.right || routes.down; routes.left = routes.left || routes.up; } // Reverse horizontal controls for rtl if( config.rtl ) { let left = routes.left; routes.left = routes.right; routes.right = left; } return routes; } /** * Returns the number of past slides. This can be used as a global * flattened index for slides. * * @param {HTMLElement} [slide=currentSlide] The slide we're counting before * * @return {number} Past slide count */ function getSlidePastCount( slide = currentSlide ) { let horizontalSlides = getHorizontalSlides(); // The number of past slides let pastCount = 0; // Step through all slides and count the past ones mainLoop: for( let i = 0; i < horizontalSlides.length; i++ ) { let horizontalSlide = horizontalSlides[i]; let verticalSlides = horizontalSlide.querySelectorAll( 'section' ); for( let j = 0; j < verticalSlides.length; j++ ) { // Stop as soon as we arrive at the present if( verticalSlides[j] === slide ) { break mainLoop; } // Don't count slides with the "uncounted" class if( verticalSlides[j].dataset.visibility !== 'uncounted' ) { pastCount++; } } // Stop as soon as we arrive at the present if( horizontalSlide === slide ) { break; } // Don't count the wrapping section for vertical slides and // slides marked as uncounted if( horizontalSlide.classList.contains( 'stack' ) === false && !horizontalSlide.dataset.visibility !== 'uncounted' ) { pastCount++; } } return pastCount; } /** * Returns a value ranging from 0-1 that represents * how far into the presentation we have navigated. * * @return {number} */ function getProgress() { // The number of past and total slides let totalCount = getTotalSlides(); let pastCount = getSlidePastCount(); if( currentSlide ) { let allFragments = currentSlide.querySelectorAll( '.fragment' ); // If there are fragments in the current slide those should be // accounted for in the progress. if( allFragments.length > 0 ) { let 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) let fragmentWeight = 0.9; // Add fragment progress to the past slide count pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight; } } return Math.min( pastCount / ( totalCount - 1 ), 1 ); } /** * Checks if this presentation is running inside of the * speaker notes window. * * @return {boolean} */ function isSpeakerNotes() { return !!window.location.search.match( /receiver/gi ); } /** * Retrieves the h/v location and fragment of the current, * or specified, slide. * * @param {HTMLElement} [slide] If specified, the returned * index will be for this slide rather than the currently * active one * * @return {{h: number, v: number, f: number}} */ function getIndices( slide ) { // By default, return the current indices let h = indexh, v = indexv, f; // If a slide is specified, return the indices of that slide if( slide ) { let isVertical = isVerticalSlide( slide ); let slideh = isVertical ? slide.parentNode : slide; // Select all horizontal slides let 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 ) { let hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0; if( hasFragments ) { let 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, v, f }; } /** * Retrieves all slides in this presentation. */ function getSlides() { return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack):not([data-visibility="uncounted"])' ) ); } /** * Returns a list of all horizontal slides in the deck. Each * vertical stack is included as one horizontal slide in the * resulting array. */ function getHorizontalSlides() { return toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); } /** * Returns all vertical slides that exist within this deck. */ function getVerticalSlides() { return toArray( dom.wrapper.querySelectorAll( '.slides>section>section' ) ); } /** * Returns all vertical stacks (each stack can contain multiple slides). */ function getVerticalStacks() { return toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ); } /** * Returns true if there are at least two horizontal slides. */ function hasHorizontalSlides() { return getHorizontalSlides().length > 1; } /** * Returns true if there are at least two vertical slides. */ function hasVerticalSlides() { return getVerticalSlides().length > 1; } /** * Returns an array of objects where each object represents the * attributes on its respective slide. */ function getSlidesAttributes() { return getSlides().map( slide => { let attributes = {}; for( let i = 0; i < slide.attributes.length; i++ ) { let attribute = slide.attributes[ i ]; attributes[ attribute.name ] = attribute.value; } return attributes; } ); } /** * Retrieves the total number of slides in this presentation. * * @return {number} */ function getTotalSlides() { return getSlides().length; } /** * Returns the slide element matching the specified index. * * @return {HTMLElement} */ function getSlide( x, y ) { let horizontalSlide = getHorizontalSlides()[ x ]; let verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' ); if( verticalSlides && verticalSlides.length && typeof y === 'number' ) { return verticalSlides ? verticalSlides[ y ] : undefined; } return horizontalSlide; } /** * Returns the background element for the given slide. * All slides, even the ones with no background properties * defined, have a background element so as long as the * index is valid an element will be returned. * * @param {mixed} x Horizontal background index OR a slide * HTML element * @param {number} y Vertical background index * @return {(HTMLElement[]|*)} */ function getSlideBackground( x, y ) { let slide = typeof x === 'number' ? getSlide( x, y ) : x; if( slide ) { return slide.slideBackgroundElement; } return undefined; } /** * Retrieves the speaker notes from a slide. Notes can be * defined in two ways: * 1. As a data-notes attribute on the slide
* 2. As an