3491 lines
96 KiB
JavaScript
3491 lines
96 KiB
JavaScript
import SlideContent from './controllers/slidecontent.js'
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import SlideNumber from './controllers/slidenumber.js'
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import AutoAnimate from './controllers/autoanimate.js'
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import Fragments from './controllers/fragments.js'
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import Overview from './controllers/overview.js'
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import Keyboard from './controllers/keyboard.js'
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import Location from './controllers/location.js'
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import Plugins from './controllers/plugins.js'
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import Touch from './controllers/touch.js'
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import Playback from './components/playback.js'
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import defaultConfig from './config.js'
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import { isMobile, isChrome, isAndroid, supportsZoom } from './utils/device.js'
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import { colorToRgb, colorBrightness } from './utils/color.js'
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import {
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SLIDES_SELECTOR,
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HORIZONTAL_SLIDES_SELECTOR,
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VERTICAL_SLIDES_SELECTOR,
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POST_MESSAGE_METHOD_BLACKLIST
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} from './utils/constants.js'
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import {
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extend,
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toArray,
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distanceBetween,
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deserialize,
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transformElement,
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createSingletonNode,
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createStyleSheet,
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closestParent,
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enterFullscreen,
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getQueryHash
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} from './utils/util.js'
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/**
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* reveal.js
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* http://revealjs.com
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* MIT licensed
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*
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* Copyright (C) 2020 Hakim El Hattab, https://hakim.se
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*/
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export default function( revealElement, options ) {
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const Reveal = {};
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// The reveal.js version
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const VERSION = '4.0.0-dev';
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// Configuration defaults, can be overridden at initialization time
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let config,
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// Flags if reveal.js is loaded (has dispatched the 'ready' event)
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ready = false,
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// The horizontal and vertical index of the currently active slide
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indexh,
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indexv,
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// The previous and current slide HTML elements
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previousSlide,
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currentSlide,
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previousBackground,
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// Remember which directions that the user has navigated towards
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hasNavigatedHorizontally = false,
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hasNavigatedVertically = false,
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// Slides may hold a data-state attribute which we pick up and apply
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// as a class to the body. This list contains the combined state of
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// all current slides.
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state = [],
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// The current scale of the presentation (see width/height config)
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scale = 1,
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// Controls loading and playback of slide content
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slideContent = new SlideContent( Reveal ),
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// Controls the optional slide number display
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slideNumber = new SlideNumber( Reveal ),
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// Controls auto-animations between slides
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autoAnimate = new AutoAnimate( Reveal ),
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// Controls navigation between slide fragments
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fragments = new Fragments( Reveal ),
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// Controls the birds-eye overview of slides
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overview = new Overview( Reveal ),
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// Controls all keyboard interactions
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keyboard = new Keyboard( Reveal ),
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// Controls the current location/URL
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location = new Location( Reveal ),
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// Controller for plugin loading
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plugins = new Plugins(),
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// Controls touch/swipe navigation for our deck
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touch = new Touch( Reveal ),
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// CSS transform that is currently applied to the slides container,
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// split into two groups
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slidesTransform = { layout: '', overview: '' },
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// Cached references to DOM elements
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dom = {},
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// List of asynchronously loaded reveal.js dependencies
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asyncDependencies = [],
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// Throttles mouse wheel navigation
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lastMouseWheelStep = 0,
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// Is the mouse pointer currently hidden from view
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cursorHidden = false,
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// Timeout used to determine when the cursor is inactive
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cursorInactiveTimeout = 0,
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// Flags if the interaction event listeners are bound
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eventsAreBound = false,
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// The current auto-slide duration
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autoSlide = 0,
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// Auto slide properties
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autoSlidePlayer,
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autoSlideTimeout = 0,
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autoSlideStartTime = -1,
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autoSlidePaused = false;
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/**
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* Starts up the presentation if the client is capable.
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*/
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function initialize() {
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if( !revealElement ) {
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console.warn( 'reveal.js can not initialize without a valid .reveal element.' );
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return;
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}
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// Cache references to key DOM elements
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dom.wrapper = revealElement;
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dom.slides = revealElement.querySelector( '.slides' );
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// Force a layout when the whole page, incl fonts, has loaded
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window.addEventListener( 'load', layout, false );
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// Copy options over to our config object
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config = { ...defaultConfig, ...options, ...getQueryHash() };
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// Load plugins then move on to #start()
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plugins.load( config.dependencies ).then( start )
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return new Promise( resolve => Reveal.addEventListener( 'ready', resolve ) );
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}
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/**
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* Starts up reveal.js by binding input events and navigating
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* to the current URL deeplink if there is one.
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*/
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function start() {
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ready = true;
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// Make sure we've got all the DOM elements we need
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setupDOM();
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// Listen to messages posted to this window
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setupPostMessage();
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// Prevent the slides from being scrolled out of view
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setupScrollPrevention();
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// Resets all vertical slides so that only the first is visible
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resetVerticalSlides();
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// Updates the presentation to match the current configuration values
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configure();
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// Read the initial hash
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location.readURL();
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// Update all backgrounds
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updateBackground( true );
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// Notify listeners that the presentation is ready but use a 1ms
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// timeout to ensure it's not fired synchronously after #initialize()
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setTimeout( () => {
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// Enable transitions now that we're loaded
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dom.slides.classList.remove( 'no-transition' );
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dom.wrapper.classList.add( 'ready' );
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dispatchEvent({
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type: 'ready',
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data: {
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indexh,
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indexv,
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currentSlide
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}
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});
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}, 1 );
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// Special setup and config is required when printing to PDF
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if( isPrintingPDF() ) {
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removeEventListeners();
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// The document needs to have loaded for the PDF layout
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// measurements to be accurate
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if( document.readyState === 'complete' ) {
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setupPDF();
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}
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else {
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window.addEventListener( 'load', setupPDF );
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}
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}
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}
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/**
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* Finds and stores references to DOM elements which are
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* required by the presentation. If a required element is
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* not found, it is created.
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*/
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function setupDOM() {
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// Prevent transitions while we're loading
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dom.slides.classList.add( 'no-transition' );
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if( isMobile ) {
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dom.wrapper.classList.add( 'no-hover' );
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}
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else {
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dom.wrapper.classList.remove( 'no-hover' );
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}
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// Background element
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dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
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// Progress bar
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dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
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dom.progressbar = dom.progress.querySelector( 'span' );
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// Arrow controls
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dom.controls = createSingletonNode( dom.wrapper, 'aside', 'controls',
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`<button class="navigate-left" aria-label="${ config.rtl ? 'next slide' : 'previous slide' }"><div class="controls-arrow"></div></button>
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<button class="navigate-right" aria-label="${ config.rtl ? 'previous slide' : 'next slide' }"><div class="controls-arrow"></div></button>
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<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>
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<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></button>` );
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// Slide number
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slideNumber.createElement();
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// Element containing notes that are visible to the audience
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dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
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dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
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dom.speakerNotes.setAttribute( 'tabindex', '0' );
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// Overlay graphic which is displayed during the paused mode
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dom.pauseOverlay = createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class="resume-button">Resume presentation</button>' : null );
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dom.wrapper.setAttribute( 'role', 'application' );
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// There can be multiple instances of controls throughout the page
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dom.controlsLeft = toArray( dom.wrapper.querySelectorAll( '.navigate-left' ) );
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dom.controlsRight = toArray( dom.wrapper.querySelectorAll( '.navigate-right' ) );
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dom.controlsUp = toArray( dom.wrapper.querySelectorAll( '.navigate-up' ) );
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dom.controlsDown = toArray( dom.wrapper.querySelectorAll( '.navigate-down' ) );
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dom.controlsPrev = toArray( dom.wrapper.querySelectorAll( '.navigate-prev' ) );
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dom.controlsNext = toArray( dom.wrapper.querySelectorAll( '.navigate-next' ) );
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// The left, right and down arrows in the standard reveal.js controls
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dom.controlsRightArrow = dom.controls.querySelector( '.navigate-right' );
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dom.controlsLeftArrow = dom.controls.querySelector( '.navigate-left' );
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dom.controlsDownArrow = dom.controls.querySelector( '.navigate-down' );
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dom.statusElement = createStatusElement();
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}
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/**
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* Creates a hidden div with role aria-live to announce the
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* current slide content. Hide the div off-screen to make it
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* available only to Assistive Technologies.
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*
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* @return {HTMLElement}
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*/
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function createStatusElement() {
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let statusElement = dom.wrapper.querySelector( '.aria-status' );
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if( !statusElement ) {
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statusElement = document.createElement( 'div' );
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statusElement.style.position = 'absolute';
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statusElement.style.height = '1px';
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statusElement.style.width = '1px';
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statusElement.style.overflow = 'hidden';
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statusElement.style.clip = 'rect( 1px, 1px, 1px, 1px )';
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statusElement.classList.add( 'aria-status' );
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statusElement.setAttribute( 'aria-live', 'polite' );
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statusElement.setAttribute( 'aria-atomic','true' );
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dom.wrapper.appendChild( statusElement );
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}
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return statusElement;
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}
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/**
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* Announces the given text to screen readers.
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*/
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function announceStatus( value ) {
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dom.statusElement.textContent = value;
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}
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/**
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* Converts the given HTML element into a string of text
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* that can be announced to a screen reader. Hidden
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* elements are excluded.
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*/
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function getStatusText( node ) {
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let text = '';
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// Text node
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if( node.nodeType === 3 ) {
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text += node.textContent;
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}
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// Element node
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else if( node.nodeType === 1 ) {
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let isAriaHidden = node.getAttribute( 'aria-hidden' );
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let isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
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if( isAriaHidden !== 'true' && !isDisplayHidden ) {
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toArray( node.childNodes ).forEach( child => {
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text += getStatusText( child );
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} );
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}
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}
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text = text.trim();
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return text === '' ? '' : text + ' ';
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}
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/**
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* Configures the presentation for printing to a static
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* PDF.
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*/
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function setupPDF() {
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let slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
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// Dimensions of the PDF pages
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let pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
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pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
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// Dimensions of slides within the pages
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let slideWidth = slideSize.width,
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slideHeight = slideSize.height;
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// Let the browser know what page size we want to print
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createStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
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// Limit the size of certain elements to the dimensions of the slide
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createStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
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document.documentElement.classList.add( 'print-pdf' );
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document.body.style.width = pageWidth + 'px';
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document.body.style.height = pageHeight + 'px';
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// Make sure stretch elements fit on slide
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layoutSlideContents( slideWidth, slideHeight );
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// Compute slide numbers now, before we start duplicating slides
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let doingSlideNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
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toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
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slide.setAttribute( 'data-slide-number', slideNumber.getSlideNumber( slide ) );
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} );
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// Slide and slide background layout
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toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
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// Vertical stacks are not centred since their section
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// children will be
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if( slide.classList.contains( 'stack' ) === false ) {
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// Center the slide inside of the page, giving the slide some margin
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let left = ( pageWidth - slideWidth ) / 2,
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top = ( pageHeight - slideHeight ) / 2;
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let contentHeight = slide.scrollHeight;
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let numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
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// Adhere to configured pages per slide limit
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numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
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// Center slides vertically
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if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
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top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
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}
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// Wrap the slide in a page element and hide its overflow
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// so that no page ever flows onto another
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let page = document.createElement( 'div' );
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page.className = 'pdf-page';
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page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
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slide.parentNode.insertBefore( page, slide );
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page.appendChild( slide );
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// Position the slide inside of the page
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slide.style.left = left + 'px';
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slide.style.top = top + 'px';
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slide.style.width = slideWidth + 'px';
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if( slide.slideBackgroundElement ) {
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page.insertBefore( slide.slideBackgroundElement, slide );
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}
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// Inject notes if `showNotes` is enabled
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if( config.showNotes ) {
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// Are there notes for this slide?
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let notes = getSlideNotes( slide );
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if( notes ) {
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let notesSpacing = 8;
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let notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
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let notesElement = document.createElement( 'div' );
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notesElement.classList.add( 'speaker-notes' );
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notesElement.classList.add( 'speaker-notes-pdf' );
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notesElement.setAttribute( 'data-layout', notesLayout );
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notesElement.innerHTML = notes;
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if( notesLayout === 'separate-page' ) {
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page.parentNode.insertBefore( notesElement, page.nextSibling );
|
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}
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else {
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notesElement.style.left = notesSpacing + 'px';
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notesElement.style.bottom = notesSpacing + 'px';
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notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
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page.appendChild( notesElement );
|
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}
|
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|
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}
|
||
|
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}
|
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|
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// Inject slide numbers if `slideNumbers` are enabled
|
||
if( doingSlideNumbers ) {
|
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let numberElement = document.createElement( 'div' );
|
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numberElement.classList.add( 'slide-number' );
|
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numberElement.classList.add( 'slide-number-pdf' );
|
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numberElement.innerHTML = slide.getAttribute( 'data-slide-number' );
|
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page.appendChild( numberElement );
|
||
}
|
||
|
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// 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({ type: '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 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 );
|
||
|
||
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;
|
||
}
|
||
|
||
// Update the state of our fragments
|
||
if( config.fragments === false ) {
|
||
fragments.disable();
|
||
}
|
||
else if( oldConfig.fragments === false ) {
|
||
fragments.enable();
|
||
}
|
||
|
||
// 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({ 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' ) {
|
||
|
||
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 =
|
||
`<header>
|
||
<a class="close" href="#"><span class="icon"></span></a>
|
||
<a class="external" href="${url}" target="_blank"><span class="icon"></span></a>
|
||
</header>
|
||
<div class="spinner"></div>
|
||
<div class="viewport">
|
||
<iframe src="${url}"></iframe>
|
||
<small class="viewport-inner">
|
||
<span class="x-frame-error">Unable to load iframe. This is likely due to the site's policy (x-frame-options).</span>
|
||
</small>
|
||
</div>`;
|
||
|
||
dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', event => {
|
||
dom.overlay.classList.add( 'loaded' );
|
||
}, false );
|
||
|
||
dom.overlay.querySelector( '.close' ).addEventListener( 'click', event => {
|
||
closeOverlay();
|
||
event.preventDefault();
|
||
}, false );
|
||
|
||
dom.overlay.querySelector( '.external' ).addEventListener( 'click', event => {
|
||
closeOverlay();
|
||
}, false );
|
||
|
||
}
|
||
|
||
/**
|
||
* Open or close help overlay window.
|
||
*
|
||
* @param {Boolean} [override] Flag which overrides the
|
||
* toggle logic and forcibly sets the desired state. True means
|
||
* help is open, false means it's closed.
|
||
*/
|
||
function toggleHelp( override ){
|
||
|
||
if( typeof override === 'boolean' ) {
|
||
override ? showHelp() : closeOverlay();
|
||
}
|
||
else {
|
||
if( dom.overlay ) {
|
||
closeOverlay();
|
||
}
|
||
else {
|
||
showHelp();
|
||
}
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Opens an overlay window with help material.
|
||
*/
|
||
function showHelp() {
|
||
|
||
if( config.help ) {
|
||
|
||
closeOverlay();
|
||
|
||
dom.overlay = document.createElement( 'div' );
|
||
dom.overlay.classList.add( 'overlay' );
|
||
dom.overlay.classList.add( 'overlay-help' );
|
||
dom.wrapper.appendChild( dom.overlay );
|
||
|
||
let html = '<p class="title">Keyboard Shortcuts</p><br/>';
|
||
|
||
html += '<table><th>KEY</th><th>ACTION</th>';
|
||
for( let key in keyboard.shortcuts ) {
|
||
html += `<tr><td>${key}</td><td>${keyboard.shortcuts[ key ]}</td></tr>`;
|
||
}
|
||
|
||
// Add custom key bindings that have associated descriptions
|
||
for( let binding in keyboard.registeredKeyBindings ) {
|
||
if( keyboard.registeredKeyBindings[binding].key && keyboard.registeredKeyBindings[binding].description ) {
|
||
html += `<tr><td>${keyboard.registeredKeyBindings[binding].key}</td><td>${keyboard.registeredKeyBindings[binding].description}</td></tr>`;
|
||
}
|
||
}
|
||
|
||
html += '</table>';
|
||
|
||
dom.overlay.innerHTML = `
|
||
<header>
|
||
<a class="close" href="#"><span class="icon"></span></a>
|
||
</header>
|
||
<div class="viewport">
|
||
<div class="viewport-inner">${html}</div>
|
||
</div>
|
||
`;
|
||
|
||
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({
|
||
type: 'resize',
|
||
data: {
|
||
oldScale,
|
||
scale,
|
||
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({ 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 );
|
||
|
||
// 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({ 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 ) );
|
||
|
||
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' );
|
||
} );
|
||
}
|
||
}
|
||
}
|
||
|
||
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( 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() || '<span class="notes-placeholder">No notes on this slide.</span>';
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Updates the visibility of the speaker notes sidebar that
|
||
* is used to share annotated slides. The notes sidebar is
|
||
* only visible if showNotes is true and there are notes on
|
||
* one or more slides in the deck.
|
||
*/
|
||
function updateNotesVisibility() {
|
||
|
||
if( config.showNotes && hasNotes() ) {
|
||
dom.wrapper.classList.add( 'show-notes' );
|
||
}
|
||
else {
|
||
dom.wrapper.classList.remove( 'show-notes' );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Checks if there are speaker notes for ANY slide in the
|
||
* presentation.
|
||
*/
|
||
function hasNotes() {
|
||
|
||
return dom.slides.querySelectorAll( '[data-notes], aside.notes' ).length > 0;
|
||
|
||
}
|
||
|
||
/**
|
||
* Updates the progress bar to reflect the current slide.
|
||
*/
|
||
function updateProgress() {
|
||
|
||
// Update progress if enabled
|
||
if( config.progress && dom.progressbar ) {
|
||
|
||
dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Updates the 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 <section>
|
||
* 2. As an <aside class="notes"> inside of the slide
|
||
*
|
||
* @param {HTMLElement} [slide=currentSlide]
|
||
* @return {(string|null)}
|
||
*/
|
||
function getSlideNotes( slide = currentSlide ) {
|
||
|
||
// Notes can be specified via the data-notes attribute...
|
||
if( slide.hasAttribute( 'data-notes' ) ) {
|
||
return slide.getAttribute( 'data-notes' );
|
||
}
|
||
|
||
// ... or using an <aside class="notes"> element
|
||
let notesElement = slide.querySelector( 'aside.notes' );
|
||
if( notesElement ) {
|
||
return notesElement.innerHTML;
|
||
}
|
||
|
||
return null;
|
||
|
||
}
|
||
|
||
/**
|
||
* Retrieves the current state of the presentation as
|
||
* an object. This state can then be restored at any
|
||
* time.
|
||
*
|
||
* @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
|
||
*/
|
||
function getState() {
|
||
|
||
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 ) {
|
||
toArray( currentSlide.querySelectorAll( '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() {
|
||
|
||
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() {
|
||
|
||
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() {
|
||
|
||
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 = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
|
||
}
|
||
else {
|
||
previousSlide = toArray( dom.wrapper.querySelectorAll( 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() {
|
||
|
||
hasNavigatedHorizontally = true;
|
||
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();
|
||
}
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Clicking on the progress bar results in a navigation to the
|
||
* closest approximate horizontal slide using this equation:
|
||
*
|
||
* ( clickX / presentationWidth ) * numberOfSlides
|
||
*
|
||
* @param {object} event
|
||
*/
|
||
function onProgressClicked( event ) {
|
||
|
||
onUserInput( event );
|
||
|
||
event.preventDefault();
|
||
|
||
let slidesTotal = getHorizontalSlides().length;
|
||
let slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
|
||
|
||
if( config.rtl ) {
|
||
slideIndex = slidesTotal - slideIndex;
|
||
}
|
||
|
||
slide( slideIndex );
|
||
|
||
}
|
||
|
||
/**
|
||
* Event handler for navigation control buttons.
|
||
*/
|
||
function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigatePrev() : navigateLeft(); }
|
||
function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigateNext() : navigateRight(); }
|
||
function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
|
||
function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
|
||
function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
|
||
function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
|
||
|
||
/**
|
||
* Handler for the window level 'hashchange' event.
|
||
*
|
||
* @param {object} [event]
|
||
*/
|
||
function onWindowHashChange( event ) {
|
||
|
||
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,
|
||
|
||
// Navigation methods
|
||
slide,
|
||
left: navigateLeft,
|
||
right: navigateRight,
|
||
up: navigateUp,
|
||
down: navigateDown,
|
||
prev: navigatePrev,
|
||
next: navigateNext,
|
||
|
||
// Deprecated aliases
|
||
navigateTo: slide,
|
||
navigateLeft: navigateLeft,
|
||
navigateRight: navigateRight,
|
||
navigateUp: navigateUp,
|
||
navigateDown: navigateDown,
|
||
navigatePrev: navigatePrev,
|
||
navigateNext: navigateNext,
|
||
|
||
// Fragment methods
|
||
navigateFragment: fragments.goto.bind( fragments ),
|
||
prevFragment: fragments.prev.bind( fragments ),
|
||
nextFragment: fragments.next.bind( fragments ),
|
||
|
||
// Forward event binding to the reveal DOM element
|
||
addEventListener: ( type, listener, useCapture ) => {
|
||
Reveal.getRevealElement().addEventListener( type, listener, useCapture );
|
||
},
|
||
removeEventListener: ( type, listener, useCapture ) => {
|
||
Reveal.getRevealElement().removeEventListener( type, listener, useCapture );
|
||
},
|
||
|
||
// 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
|
||
isOverview: overview.isActive.bind( overview ),
|
||
isPaused,
|
||
isAutoSliding,
|
||
isSpeakerNotes,
|
||
isPrintingPDF,
|
||
|
||
// Slide preloading
|
||
loadSlide: slideContent.load.bind( slideContent ),
|
||
unloadSlide: slideContent.unload.bind( slideContent ),
|
||
|
||
// Adds or removes all internal event listeners (such as keyboard)
|
||
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 objects representing the attributes on
|
||
// the slides
|
||
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,
|
||
|
||
// 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,
|
||
|
||
// 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 the top-level DOM element
|
||
getRevealElement: () => dom.wrapper || document.querySelector( '.reveal' ),
|
||
getSlidesElement: () => dom.slides,
|
||
getBackgroundsElement: () => dom.background,
|
||
|
||
// 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,
|
||
|
||
location,
|
||
overview,
|
||
slideContent,
|
||
onUserInput,
|
||
closeOverlay,
|
||
updateControls,
|
||
updateProgress,
|
||
updateSlidesVisibility,
|
||
transformSlides,
|
||
cueAutoSlide,
|
||
cancelAutoSlide
|
||
|
||
} );
|
||
|
||
};
|