import SlideContent from './controllers/slidecontent.js' import SlideNumber from './controllers/slidenumber.js' import Backgrounds from './controllers/backgrounds.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 Controls from './controllers/controls.js' import Progress from './controllers/progress.js' import Plugins from './controllers/plugins.js' import Print from './controllers/print.js' import Touch from './controllers/touch.js' import Notes from './controllers/notes.js' import Playback from './components/playback.js' import defaultConfig from './config.js' import { isMobile, isChrome, supportsZoom } from './utils/device.js' import { SLIDES_SELECTOR, HORIZONTAL_SLIDES_SELECTOR, VERTICAL_SLIDES_SELECTOR, POST_MESSAGE_METHOD_BLACKLIST } from './utils/constants.js' import { extend, queryAll, deserialize, transformElement, createSingletonNode, closestParent, getQueryHash, getRemainingHeight } 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, // Remember which directions that the user has navigated towards navigationHistory = { hasNavigatedHorizontally: false, hasNavigatedVertically: false }, // Slides may have 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, // Controllers for different aspects of our presentation. They're // all given direct references to this Reveal instance since there // may be multiple presentations running in parallel. slideContent = new SlideContent( Reveal ), slideNumber = new SlideNumber( Reveal ), autoAnimate = new AutoAnimate( Reveal ), backgrounds = new Backgrounds( Reveal ), fragments = new Fragments( Reveal ), overview = new Overview( Reveal ), keyboard = new Keyboard( Reveal ), location = new Location( Reveal ), controls = new Controls( Reveal ), progress = new Progress( Reveal ), plugins = new Plugins( Reveal ), print = new Print( Reveal ), touch = new Touch( Reveal ), notes = new Notes( 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' ); // Copy options over to our config object config = { ...defaultConfig, ...options, ...getQueryHash() }; // Embedded decks use the reveal element as their viewport if( config.embedded === true ) { revealElement.classList.add( 'reveal-viewport' ); } // Non-embedded decks cover the full page and use the body // as their viewport else { document.body.classList.add( 'reveal-viewport' ); document.documentElement.classList.add( 'reveal-full-page' ); } // Force a layout when the whole page, incl fonts, has loaded window.addEventListener( 'load', layout, false ); // Load plugins then move on to #start() plugins.load( config.dependencies ).then( start ); return new Promise( resolve => Reveal.on( '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(); // Create slide backgrounds backgrounds.update( 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({ type: 'ready', data: { indexh, indexv, currentSlide } }); }, 1 ); // Special setup and config is required when printing to PDF if( print.isPrintingPDF() ) { removeEventListeners(); // The document needs to have loaded for the PDF layout // measurements to be accurate if( document.readyState === 'complete' ) { print.setupPDF(); } else { window.addEventListener( 'load', print.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' ); } backgrounds.render(); slideNumber.render(); controls.render(); progress.render(); notes.render(); // Overlay graphic which is displayed during the paused mode dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '' : null ); dom.statusElement = createStatusElement(); dom.wrapper.setAttribute( 'role', 'application' ); } /** * 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 ) { Array.from( node.childNodes ).forEach( child => { text += getStatusText( child ); } ); } } text = text.trim(); return text === '' ? '' : text + ' '; } /** * 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 ); } /** * 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 oldConfig = { ...config } // 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( oldConfig.transition ); dom.wrapper.classList.add( config.transition ); dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed ); dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition ); 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.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; } // 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' ); } notes.configure( config, oldConfig ); controls.configure( config, oldConfig ); progress.configure( config, oldConfig ); keyboard.configure( config, oldConfig ); fragments.configure( config, oldConfig ); slideNumber.configure( config, oldConfig ); 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(); controls.bind(); progress.bind(); dom.pauseOverlay.addEventListener( 'click', resume, false ); if( config.focusBodyOnPageVisibilityChange ) { document.addEventListener( 'visibilitychange', onPageVisibilityChange, false ); } } /** * Unbinds all event listeners. */ function removeEventListeners() { eventsAreBound = false; touch.unbind(); keyboard.unbind(); controls.unbind(); progress.unbind(); window.removeEventListener( 'hashchange', onWindowHashChange, false ); window.removeEventListener( 'resize', onWindowResize, false ); dom.pauseOverlay.removeEventListener( 'click', resume, false ); } /** * Adds a listener to one of our custom reveal.js events, * like slidechanged. */ function on( type, listener, useCapture ) { revealElement.addEventListener( type, listener, useCapture ); } /** * Unsubscribes from a reveal.js event. */ function off( type, listener, useCapture ) { revealElement.removeEventListener( type, listener, useCapture ); } /** * 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 ); } } /** * Dispatches an event of the specified type from the * reveal DOM element. */ function dispatchEvent({ target=dom.wrapper, type, data, bubbles=true }) { let event = document.createEvent( 'HTMLEvents', 1, 2 ); event.initEvent( type, bubbles, true ); extend( event, data ); target.dispatchEvent( event ); if( target === dom.wrapper ) { // 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' ) { Array.from( 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' ) { Array.from( 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 && !print.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 = Array.from( 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({ type: 'resize', data: { oldScale, scale, size } }); } } progress.update(); backgrounds.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 queryAll( dom.slides, '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({ type: 'paused' }); } } } /** * Exits from the paused mode. */ function resume() { const wasPaused = dom.wrapper.classList.contains( 'paused' ); dom.wrapper.classList.remove( 'paused' ); cueAutoSlide(); if( wasPaused ) { dispatchEvent({ type: '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 ); // Dispatch an event if the slide changed let slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore ); // Ensure that the previous slide is never the same as the current if( !slideChanged ) previousSlide = null; // 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; let autoAnimateTransition = false; // Detect if we're moving between two auto-animated slides if( slideChanged && previousSlide && currentSlide && !overview.isActive() ) { // If this is an auto-animated transition, we disable the // regular slide transition // // Note 20-03-2020: // This needs to happen before we update slide visibility, // otherwise transitions will still run in Safari. if( previousSlide.hasAttribute( 'data-auto-animate' ) && currentSlide.hasAttribute( 'data-auto-animate' ) ) { autoAnimateTransition = true; dom.slides.classList.add( 'disable-slide-transitions' ); } } // 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(); } // Show fragment, if specified if( typeof f !== 'undefined' ) { fragments.goto( f ); } // 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({ type: state[i] }); } // Clean up the remains of the previous state while( stateBefore.length ) { document.documentElement.classList.remove( stateBefore.pop() ); } if( slideChanged ) { dispatchEvent({ type: 'slidechanged', data: { indexh, indexv, previousSlide, 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 ) ); progress.update(); controls.update(); notes.update(); backgrounds.update(); backgrounds.updateParallax(); slideNumber.update(); fragments.update(); // Update the URL hash location.writeURL(); cueAutoSlide(); // Auto-animation if( autoAnimateTransition ) { 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 all slide backgrounds backgrounds.create(); // Write the current hash to the URL location.writeURL(); fragments.sortAll(); controls.update(); progress.update(); updateSlidesVisibility(); notes.update(); notes.updateVisibility(); backgrounds.update( true ); 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 ) { backgrounds.sync( slide ); fragments.sync( slide ); slideContent.load( slide ); backgrounds.update(); notes.update(); } /** * Resets all vertical slides so that only the first * is visible. */ function resetVerticalSlides() { getHorizontalSlides().forEach( horizontalSlide => { queryAll( horizontalSlide, '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 = queryAll( dom.wrapper, selector ), slidesLength = slides.length; let printMode = print.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 queryAll( element, '.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 queryAll( element, '.fragment.visible' ).forEach( fragment => { fragment.classList.remove( 'visible', 'current-fragment' ); } ); } } } let slide = slides[index]; let wasPresent = slide.classList.contains( 'present' ); // Mark the current slide as present slide.classList.add( 'present' ); slide.removeAttribute( 'hidden' ); slide.removeAttribute( 'aria-hidden' ); if( !wasPresent ) { // Dispatch an event indicating the slide is now visible dispatchEvent({ target: slide, type: 'visible', bubbles: false }); } // If this slide has a state associated with it, add it // onto the current state of the deck let slideState = slide.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( print.isPrintingPDF() ) { viewDistance = Number.MAX_VALUE; } for( let x = 0; x < horizontalSlidesLength; x++ ) { let horizontalSlide = horizontalSlides[x]; let verticalSlides = queryAll( horizontalSlide, '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' ); } } } /** * 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 ); } /** * 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 = getHorizontalSlides(); // 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( queryAll( slide.parentNode, '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 queryAll( dom.wrapper, 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 queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR ); } /** * Returns all vertical slides that exist within this deck. */ function getVerticalSlides() { return queryAll( dom.wrapper, '.slides>section>section' ); } /** * Returns all vertical stacks (each stack can contain multiple slides). */ function getVerticalStacks() { return queryAll( dom.wrapper, 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 current state of the presentation as * an object. This state can then be restored at any * time. * * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}} */ function getState() { let indices = getIndices(); return { indexh: indices.h, indexv: indices.v, indexf: indices.f, paused: isPaused(), overview: overview.isActive() }; } /** * Restores the presentation to the given state. * * @param {object} state As generated by getState() * @see {@link getState} generates the parameter `state` */ function setState( state ) { if( typeof state === 'object' ) { slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) ); let pausedFlag = deserialize( state.paused ), overviewFlag = deserialize( state.overview ); if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) { togglePause( pausedFlag ); } if( typeof overviewFlag === 'boolean' && overviewFlag !== overview.isActive() ) { overview.toggle( overviewFlag ); } } } /** * Cues a new automated slide if enabled in the config. */ function cueAutoSlide() { cancelAutoSlide(); if( currentSlide && config.autoSlide !== false ) { let fragment = currentSlide.querySelector( '.current-fragment' ); // When the slide first appears there is no "current" fragment so // we look for a data-autoslide timing on the first fragment if( !fragment ) fragment = currentSlide.querySelector( '.fragment' ); let fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null; let parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null; let slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' ); // Pick value in the following priority order: // 1. Current fragment's data-autoslide // 2. Current slide's data-autoslide // 3. Parent slide's data-autoslide // 4. Global autoSlide setting if( fragmentAutoSlide ) { autoSlide = parseInt( fragmentAutoSlide, 10 ); } else if( slideAutoSlide ) { autoSlide = parseInt( slideAutoSlide, 10 ); } else if( parentAutoSlide ) { autoSlide = parseInt( parentAutoSlide, 10 ); } else { autoSlide = config.autoSlide; } // If there are media elements with data-autoplay, // automatically set the autoSlide duration to the // length of that media. Not applicable if the slide // is divided up into fragments. // playbackRate is accounted for in the duration. if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) { queryAll( currentSlide, 'video, audio' ).forEach( el => { if( el.hasAttribute( 'data-autoplay' ) ) { if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) { autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000; } } } ); } // Cue the next auto-slide if: // - There is an autoSlide value // - Auto-sliding isn't paused by the user // - The presentation isn't paused // - The overview isn't active // - The presentation isn't over if( autoSlide && !autoSlidePaused && !isPaused() && !overview.isActive() && ( !isLastSlide() || fragments.availableRoutes().next || config.loop === true ) ) { autoSlideTimeout = setTimeout( () => { if( typeof config.autoSlideMethod === 'function' ) { config.autoSlideMethod() } else { navigateNext(); } cueAutoSlide(); }, autoSlide ); autoSlideStartTime = Date.now(); } if( autoSlidePlayer ) { autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 ); } } } /** * Cancels any ongoing request to auto-slide. */ function cancelAutoSlide() { clearTimeout( autoSlideTimeout ); autoSlideTimeout = -1; } function pauseAutoSlide() { if( autoSlide && !autoSlidePaused ) { autoSlidePaused = true; dispatchEvent({ type: 'autoslidepaused' }); clearTimeout( autoSlideTimeout ); if( autoSlidePlayer ) { autoSlidePlayer.setPlaying( false ); } } } function resumeAutoSlide() { if( autoSlide && autoSlidePaused ) { autoSlidePaused = false; dispatchEvent({ type: 'autoslideresumed' }); cueAutoSlide(); } } function navigateLeft() { navigationHistory.hasNavigatedHorizontally = true; // Reverse for RTL if( config.rtl ) { if( ( overview.isActive() || fragments.next() === false ) && availableRoutes().left ) { slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined ); } } // Normal navigation else if( ( overview.isActive() || fragments.prev() === false ) && availableRoutes().left ) { slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined ); } } function navigateRight() { navigationHistory.hasNavigatedHorizontally = true; // Reverse for RTL if( config.rtl ) { if( ( overview.isActive() || fragments.prev() === false ) && availableRoutes().right ) { slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined ); } } // Normal navigation else if( ( overview.isActive() || fragments.next() === false ) && availableRoutes().right ) { slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined ); } } function navigateUp() { // Prioritize hiding fragments if( ( overview.isActive() || fragments.prev() === false ) && availableRoutes().up ) { slide( indexh, indexv - 1 ); } } function navigateDown() { navigationHistory.hasNavigatedVertically = true; // Prioritize revealing fragments if( ( overview.isActive() || fragments.next() === 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( fragments.prev() === false ) { if( availableRoutes().up ) { navigateUp(); } else { // Fetch the previous horizontal slide, if there is one let previousSlide; if( config.rtl ) { previousSlide = queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.future' ).pop(); } else { previousSlide = queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.past' ).pop(); } if( previousSlide ) { let v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined; let h = indexh - 1; slide( h, v ); } } } } /** * The reverse of #navigatePrev(). */ function navigateNext() { navigationHistory.hasNavigatedHorizontally = true; navigationHistory.hasNavigatedVertically = true; // Prioritize revealing fragments if( fragments.next() === false ) { let routes = availableRoutes(); // When looping is enabled `routes.down` is always available // so we need a separate check for when we've reached the // end of a stack and should move horizontally if( routes.down && routes.right && config.loop && isLastVerticalSlide( currentSlide ) ) { routes.down = false; } if( routes.down ) { navigateDown(); } else if( config.rtl ) { navigateLeft(); } else { navigateRight(); } } } // --------------------------------------------------------------------// // ----------------------------- EVENTS -------------------------------// // --------------------------------------------------------------------// /** * Called by all event handlers that are based on user * input. * * @param {object} [event] */ function onUserInput( event ) { if( config.autoSlideStoppable ) { pauseAutoSlide(); } } /** * Called whenever there is mouse input at the document level * to determine if the cursor is active or not. * * @param {object} event */ function onDocumentCursorActive( event ) { showCursor(); clearTimeout( cursorInactiveTimeout ); cursorInactiveTimeout = setTimeout( hideCursor, config.hideCursorTime ); } /** * Handles mouse wheel scrolling, throttled to avoid skipping * multiple slides. * * @param {object} event */ function onDocumentMouseScroll( event ) { if( Date.now() - lastMouseWheelStep > 600 ) { lastMouseWheelStep = Date.now(); let delta = event.detail || -event.wheelDelta; if( delta > 0 ) { navigateNext(); } else if( delta < 0 ) { navigatePrev(); } } } /** * Handler for the window level 'hashchange' event. * * @param {object} [event] */ function onWindowHashChange( event ) { location.readURL(); } /** * Handler for the window level 'resize' event. * * @param {object} [event] */ function onWindowResize( event ) { layout(); } /** * Handle for the window level 'visibilitychange' event. * * @param {object} [event] */ function onPageVisibilityChange( event ) { // If, after clicking a link or similar and we're coming back, // focus the document.body to ensure we can use keyboard shortcuts if( document.hidden === 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(); } } /** * Handles clicks on links that are set to preview in the * iframe overlay. * * @param {object} event */ function onPreviewLinkClicked( event ) { if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) { let url = event.currentTarget.getAttribute( 'href' ); if( url ) { showPreview( url ); event.preventDefault(); } } } /** * Handles click on the auto-sliding controls element. * * @param {object} [event] */ function onAutoSlidePlayerClick( event ) { // Replay if( isLastSlide() && config.loop === false ) { slide( 0, 0 ); resumeAutoSlide(); } // Resume else if( autoSlidePaused ) { resumeAutoSlide(); } // Pause else { pauseAutoSlide(); } } // --------------------------------------------------------------------// // ------------------------------- API --------------------------------// // --------------------------------------------------------------------// return extend( Reveal, { VERSION, initialize, configure, sync, syncSlide, syncFragments: fragments.sync.bind( fragments ), // Navigation methods slide, left: navigateLeft, right: navigateRight, up: navigateUp, down: navigateDown, prev: navigatePrev, next: navigateNext, // Navigation aliases navigateLeft, navigateRight, navigateUp, navigateDown, navigatePrev, navigateNext, // Fragment methods navigateFragment: fragments.goto.bind( fragments ), prevFragment: fragments.prev.bind( fragments ), nextFragment: fragments.next.bind( fragments ), // Event binding on, off, // Legacy event binding methods left in for backwards compatibility addEventListener: on, removeEventListener: off, // Forces an update in slide layout layout, // Randomizes the order of slides shuffle, // Returns an object with the available routes as booleans (left/right/top/bottom) availableRoutes, // Returns an object with the available fragments as booleans (prev/next) availableFragments: fragments.availableRoutes.bind( fragments ), // Toggles a help overlay with keyboard shortcuts toggleHelp, // Toggles the overview mode on/off toggleOverview: overview.toggle.bind( overview ), // Toggles the "black screen" mode on/off togglePause, // Toggles the auto slide mode on/off toggleAutoSlide, // Slide navigation checks isFirstSlide, isLastSlide, isLastVerticalSlide, isVerticalSlide, // State checks isPaused, isAutoSliding, isSpeakerNotes: notes.isSpeakerNotesWindow.bind( notes ), isOverview: overview.isActive.bind( overview ), isPrintingPDF: print.isPrintingPDF.bind( print ), // Slide preloading loadSlide: slideContent.load.bind( slideContent ), unloadSlide: slideContent.unload.bind( slideContent ), // Adds or removes all internal event listeners addEventListeners, removeEventListeners, dispatchEvent, // Facility for persisting and restoring the presentation state getState, setState, // Presentation progress getSlidePastCount, // Presentation progress on range of 0-1 getProgress, // Returns the indices of the current, or specified, slide getIndices, // Returns an Array of all slides getSlides, // Returns an Array of key:value maps of the attributes of each // slide in the deck getSlidesAttributes, // Returns the total number of slides getTotalSlides, // Returns the slide element at the specified index getSlide, // Returns the slide background element at the specified index getSlideBackground, // Returns the speaker notes string for a slide, or null getSlideNotes: notes.getSlideNotes.bind( notes ), // Returns an array with all horizontal/vertical slides in the deck getHorizontalSlides, getVerticalSlides, // Checks if the presentation contains two or more // horizontal/vertical slides hasHorizontalSlides, hasVerticalSlides, hasNavigatedHorizontally: () => navigationHistory.hasNavigatedHorizontally, hasNavigatedVertically: () => navigationHistory.hasNavigatedVertically, // Adds/removes a custom key binding addKeyBinding: keyboard.addKeyBinding.bind( keyboard ), removeKeyBinding: keyboard.removeKeyBinding.bind( keyboard ), // Programmatically triggers a keyboard event triggerKey: keyboard.triggerKey.bind( keyboard ), // Registers a new shortcut to include in the help overlay registerKeyboardShortcut: keyboard.registerKeyboardShortcut.bind( keyboard ), // API for registering and retrieving plugins registerPlugin: plugins.registerPlugin.bind( plugins ), hasPlugin: plugins.hasPlugin.bind( plugins ), getPlugin: plugins.getPlugin.bind( plugins ), getPlugins: plugins.getRegisteredPlugins.bind( plugins ), getComputedSlideSize, // Returns the previous slide element, may be null getPreviousSlide: () => previousSlide, // Returns the current slide element getCurrentSlide: () => currentSlide, // Returns the current scale of the presentation content getScale: () => scale, // Returns the current configuration object getConfig: () => config, // Helper method, retrieves query string as a key:value map getQueryHash, // Returns reveal.js DOM elements getRevealElement: () => revealElement, getSlidesElement: () => dom.slides, getBackgroundsElement: () => backgrounds.element, // Checks if reveal.js has been loaded and is ready for use isReady: () => ready, // The following API methods are primarily intended for use // by reveal.js controllers // Methods for announcing content to screen readers announceStatus, getStatusText, print, progress, controls, location, overview, fragments, slideContent, slideNumber, onUserInput, closeOverlay, updateSlidesVisibility, layoutSlideContents, transformSlides, cueAutoSlide, cancelAutoSlide } ); };