2571 lines
66 KiB
JavaScript
2571 lines
66 KiB
JavaScript
import SlideContent from './controllers/slidecontent.js'
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import SlideNumber from './controllers/slidenumber.js'
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import Backgrounds from './controllers/backgrounds.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 Controls from './controllers/controls.js'
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import Progress from './controllers/progress.js'
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import Pointer from './controllers/pointer.js'
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import Plugins from './controllers/plugins.js'
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import Print from './controllers/print.js'
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import Touch from './controllers/touch.js'
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import Notes from './controllers/notes.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 * as Util from './utils/util.js'
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import * as Device from './utils/device.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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/**
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* reveal.js
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* https://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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// Support initialization with no args, one arg
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// [options] or two args [revealElement, options]
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if( arguments.length < 2 ) {
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options = arguments[0];
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revealElement = document.querySelector( '.reveal' );
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}
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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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// Remember which directions that the user has navigated towards
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navigationHistory = {
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hasNavigatedHorizontally: false,
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hasNavigatedVertically: false
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},
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// Slides may have 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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// 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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// Flags if the interaction event listeners are bound
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eventsAreBound = false,
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// The current slide transition state; idle or running
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transition = 'idle',
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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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// Controllers for different aspects of our presentation. They're
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// all given direct references to this Reveal instance since there
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// may be multiple presentations running in parallel.
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slideContent = new SlideContent( Reveal ),
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slideNumber = new SlideNumber( Reveal ),
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autoAnimate = new AutoAnimate( Reveal ),
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backgrounds = new Backgrounds( Reveal ),
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fragments = new Fragments( Reveal ),
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overview = new Overview( Reveal ),
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keyboard = new Keyboard( Reveal ),
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location = new Location( Reveal ),
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controls = new Controls( Reveal ),
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progress = new Progress( Reveal ),
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pointer = new Pointer( Reveal ),
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plugins = new Plugins( Reveal ),
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print = new Print( Reveal ),
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touch = new Touch( Reveal ),
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notes = new Notes( Reveal );
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/**
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* Starts up the presentation.
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*/
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function initialize( initOptions ) {
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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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// Compose our config object
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config = { ...defaultConfig, ...options, ...initOptions, ...Util.getQueryHash() };
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setViewport();
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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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// Register plugins and load dependencies, then move on to #start()
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plugins.load( config.plugins, config.dependencies ).then( start );
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return new Promise( resolve => Reveal.on( 'ready', resolve ) );
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}
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/**
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* Encase the presentation in a reveal.js viewport. The
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* extent of the viewport differs based on configuration.
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*/
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function setViewport() {
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// Embedded decks use the reveal element as their viewport
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if( config.embedded === true ) {
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dom.viewport = revealElement.closest( '.reveal-viewport' ) || revealElement;
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}
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// Full-page decks use the body as their viewport
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else {
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dom.viewport = document.body;
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document.documentElement.classList.add( 'reveal-full-page' );
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}
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dom.viewport.classList.add( 'reveal-viewport' );
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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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// Create slide backgrounds
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backgrounds.update( 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( print.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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print.setupPDF();
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}
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else {
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window.addEventListener( 'load', () => {
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print.setupPDF();
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} );
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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( Device.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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backgrounds.render();
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slideNumber.render();
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controls.render();
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progress.render();
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notes.render();
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// Overlay graphic which is displayed during the paused mode
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dom.pauseOverlay = Util.createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class="resume-button">Resume presentation</button>' : null );
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dom.statusElement = createStatusElement();
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dom.wrapper.setAttribute( 'role', 'application' );
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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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Array.from( 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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* This is an unfortunate necessity. Some actions – such as
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* an input field being focused in an iframe or using the
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* keyboard to expand text selection beyond the bounds of
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* a slide – can trigger our content to be pushed out of view.
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* This scrolling can not be prevented by hiding overflow in
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* CSS (we already do) so we have to resort to repeatedly
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* checking if the slides have been offset :(
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*/
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function setupScrollPrevention() {
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setInterval( () => {
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if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
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dom.wrapper.scrollTop = 0;
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dom.wrapper.scrollLeft = 0;
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}
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}, 1000 );
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}
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/**
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* Registers a listener to postMessage events, this makes it
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* possible to call all reveal.js API methods from another
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* window. For example:
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*
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* revealWindow.postMessage( JSON.stringify({
|
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* method: 'slide',
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* args: [ 2 ]
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* }), '*' );
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*/
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function setupPostMessage() {
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if( config.postMessage ) {
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window.addEventListener( 'message', event => {
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let data = event.data;
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// Make sure we're dealing with JSON
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if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
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data = JSON.parse( data );
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// Check if the requested method can be found
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if( data.method && typeof Reveal[data.method] === 'function' ) {
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if( POST_MESSAGE_METHOD_BLACKLIST.test( data.method ) === false ) {
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const result = Reveal[data.method].apply( Reveal, data.args );
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// Dispatch a postMessage event with the returned value from
|
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// our method invocation for getter functions
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dispatchPostMessage( 'callback', { method: data.method, result: result } );
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}
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else {
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console.warn( 'reveal.js: "'+ data.method +'" is is blacklisted from the postMessage API' );
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}
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}
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}
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}, false );
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}
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}
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/**
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* Applies the configuration settings from the config
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* object. May be called multiple times.
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*
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* @param {object} options
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*/
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function configure( options ) {
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const oldConfig = { ...config }
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|
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// New config options may be passed when this method
|
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// is invoked through the API after initialization
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if( typeof options === 'object' ) Util.extend( config, options );
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// Abort if reveal.js hasn't finished loading, config
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// changes will be applied automatically once ready
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if( Reveal.isReady() === false ) return;
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const numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
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// The transition is added as a class on the .reveal element
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dom.wrapper.classList.remove( oldConfig.transition );
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dom.wrapper.classList.add( config.transition );
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dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
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dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
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if( config.shuffle ) {
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shuffle();
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}
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Util.toggleClass( dom.wrapper, 'embedded', config.embedded );
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Util.toggleClass( dom.wrapper, 'rtl', config.rtl );
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Util.toggleClass( dom.wrapper, 'center', config.center );
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// Exit the paused mode if it was configured off
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if( config.pause === false ) {
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resume();
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}
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// Iframe link previews
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if( config.previewLinks ) {
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enablePreviewLinks();
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disablePreviewLinks( '[data-preview-link=false]' );
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}
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else {
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disablePreviewLinks();
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enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
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}
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|
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// Reset all changes made by auto-animations
|
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autoAnimate.reset();
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|
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// Remove existing auto-slide controls
|
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if( autoSlidePlayer ) {
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autoSlidePlayer.destroy();
|
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autoSlidePlayer = null;
|
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}
|
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|
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// Generate auto-slide controls if needed
|
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if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable ) {
|
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autoSlidePlayer = new Playback( dom.wrapper, () => {
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return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
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} );
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autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
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autoSlidePaused = false;
|
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}
|
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|
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// Add the navigation mode to the DOM so we can adjust styling
|
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if( config.navigationMode !== 'default' ) {
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dom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );
|
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}
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else {
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dom.wrapper.removeAttribute( 'data-navigation-mode' );
|
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}
|
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notes.configure( config, oldConfig );
|
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pointer.configure( config, oldConfig );
|
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controls.configure( config, oldConfig );
|
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progress.configure( config, oldConfig );
|
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keyboard.configure( config, oldConfig );
|
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fragments.configure( config, oldConfig );
|
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slideNumber.configure( config, oldConfig );
|
||
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sync();
|
||
|
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}
|
||
|
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/**
|
||
* Binds all event listeners.
|
||
*/
|
||
function addEventListeners() {
|
||
|
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eventsAreBound = true;
|
||
|
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window.addEventListener( 'resize', onWindowResize, false );
|
||
|
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if( config.touch ) touch.bind();
|
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if( config.keyboard ) keyboard.bind();
|
||
if( config.progress ) progress.bind();
|
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controls.bind();
|
||
location.bind();
|
||
|
||
dom.slides.addEventListener( 'transitionend', onTransitionEnd, false );
|
||
dom.pauseOverlay.addEventListener( 'click', resume, false );
|
||
|
||
if( config.focusBodyOnPageVisibilityChange ) {
|
||
document.addEventListener( 'visibilitychange', onPageVisibilityChange, false );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Unbinds all event listeners.
|
||
*/
|
||
function removeEventListeners() {
|
||
|
||
eventsAreBound = false;
|
||
|
||
touch.unbind();
|
||
keyboard.unbind();
|
||
controls.unbind();
|
||
progress.unbind();
|
||
location.unbind();
|
||
|
||
window.removeEventListener( 'resize', onWindowResize, false );
|
||
|
||
dom.slides.removeEventListener( 'transitionend', onTransitionEnd, false );
|
||
dom.pauseOverlay.removeEventListener( 'click', resume, false );
|
||
|
||
}
|
||
|
||
/**
|
||
* Adds a listener to one of our custom reveal.js events,
|
||
* like slidechanged.
|
||
*/
|
||
function on( type, listener, useCapture ) {
|
||
|
||
revealElement.addEventListener( type, listener, useCapture );
|
||
|
||
}
|
||
|
||
/**
|
||
* Unsubscribes from a reveal.js event.
|
||
*/
|
||
function off( type, listener, useCapture ) {
|
||
|
||
revealElement.removeEventListener( type, listener, useCapture );
|
||
|
||
}
|
||
|
||
/**
|
||
* Applies CSS transforms to the slides container. The container
|
||
* is transformed from two separate sources: layout and the overview
|
||
* mode.
|
||
*
|
||
* @param {object} transforms
|
||
*/
|
||
function transformSlides( transforms ) {
|
||
|
||
// Pick up new transforms from arguments
|
||
if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
|
||
if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
|
||
|
||
// Apply the transforms to the slides container
|
||
if( slidesTransform.layout ) {
|
||
Util.transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
|
||
}
|
||
else {
|
||
Util.transformElement( dom.slides, slidesTransform.overview );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Dispatches an event of the specified type from the
|
||
* reveal DOM element.
|
||
*/
|
||
function dispatchEvent({ target=dom.wrapper, type, data, bubbles=true }) {
|
||
|
||
let event = document.createEvent( 'HTMLEvents', 1, 2 );
|
||
event.initEvent( type, bubbles, true );
|
||
Util.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()
|
||
};
|
||
|
||
Util.extend( message, data );
|
||
|
||
window.parent.postMessage( JSON.stringify( message ), '*' );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Bind preview frame links.
|
||
*
|
||
* @param {string} [selector=a] - selector for anchors
|
||
*/
|
||
function enablePreviewLinks( selector = 'a' ) {
|
||
|
||
Array.from( dom.wrapper.querySelectorAll( selector ) ).forEach( element => {
|
||
if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
|
||
element.addEventListener( 'click', onPreviewLinkClicked, false );
|
||
}
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Unbind preview frame links.
|
||
*/
|
||
function disablePreviewLinks( selector = 'a' ) {
|
||
|
||
Array.from( dom.wrapper.querySelectorAll( selector ) ).forEach( element => {
|
||
if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
|
||
element.removeEventListener( 'click', onPreviewLinkClicked, false );
|
||
}
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Opens a preview window for the target URL.
|
||
*
|
||
* @param {string} url - url for preview iframe src
|
||
*/
|
||
function showPreview( url ) {
|
||
|
||
closeOverlay();
|
||
|
||
dom.overlay = document.createElement( 'div' );
|
||
dom.overlay.classList.add( 'overlay' );
|
||
dom.overlay.classList.add( 'overlay-preview' );
|
||
dom.wrapper.appendChild( dom.overlay );
|
||
|
||
dom.overlay.innerHTML =
|
||
`<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 && !print.isPrintingPDF() ) {
|
||
|
||
if( !config.disableLayout ) {
|
||
|
||
// On some mobile devices '100vh' is taller than the visible
|
||
// viewport which leads to part of the presentation being
|
||
// cut off. To work around this we define our own '--vh' custom
|
||
// property where 100x adds up to the correct height.
|
||
//
|
||
// https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
|
||
if( Device.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 && Device.supportsZoom && window.devicePixelRatio < 2 ) {
|
||
dom.slides.style.zoom = scale;
|
||
dom.slides.style.left = '';
|
||
dom.slides.style.top = '';
|
||
dom.slides.style.bottom = '';
|
||
dom.slides.style.right = '';
|
||
transformSlides( { layout: '' } );
|
||
}
|
||
// Transform Scaling
|
||
// Content layout remains the exact same when scaled up.
|
||
// Side effect is content becoming blurred, especially with
|
||
// high scale values on ldpi screens.
|
||
else {
|
||
dom.slides.style.zoom = '';
|
||
dom.slides.style.left = '50%';
|
||
dom.slides.style.top = '50%';
|
||
dom.slides.style.bottom = 'auto';
|
||
dom.slides.style.right = 'auto';
|
||
transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
|
||
}
|
||
}
|
||
|
||
// Select all slides, vertical and horizontal
|
||
const slides = Array.from( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
|
||
|
||
for( let i = 0, len = slides.length; i < len; i++ ) {
|
||
const slide = slides[ i ];
|
||
|
||
// Don't bother updating invisible slides
|
||
if( slide.style.display === 'none' ) {
|
||
continue;
|
||
}
|
||
|
||
if( config.center || slide.classList.contains( 'center' ) ) {
|
||
// Vertical stacks are not centred since their section
|
||
// children will be
|
||
if( slide.classList.contains( 'stack' ) ) {
|
||
slide.style.top = 0;
|
||
}
|
||
else {
|
||
slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';
|
||
}
|
||
}
|
||
else {
|
||
slide.style.top = '';
|
||
}
|
||
|
||
}
|
||
|
||
if( oldScale !== scale ) {
|
||
dispatchEvent({
|
||
type: 'resize',
|
||
data: {
|
||
oldScale,
|
||
scale,
|
||
size
|
||
}
|
||
});
|
||
}
|
||
}
|
||
|
||
progress.update();
|
||
backgrounds.updateParallax();
|
||
|
||
if( overview.isActive() ) {
|
||
overview.update();
|
||
}
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Applies layout logic to the contents of all slides in
|
||
* the presentation.
|
||
*
|
||
* @param {string|number} width
|
||
* @param {string|number} height
|
||
*/
|
||
function layoutSlideContents( width, height ) {
|
||
|
||
// Handle sizing of elements with the 'stretch' class
|
||
Util.queryAll( dom.slides, 'section > .stretch' ).forEach( element => {
|
||
|
||
// Determine how much vertical space we can use
|
||
let remainingHeight = Util.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;
|
||
|
||
}
|
||
|
||
/**
|
||
* Enters the paused mode which fades everything on screen to
|
||
* black.
|
||
*/
|
||
function pause() {
|
||
|
||
if( config.pause ) {
|
||
const wasPaused = dom.wrapper.classList.contains( 'paused' );
|
||
|
||
cancelAutoSlide();
|
||
dom.wrapper.classList.add( 'paused' );
|
||
|
||
if( wasPaused === false ) {
|
||
dispatchEvent({ type: 'paused' });
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Exits from the paused mode.
|
||
*/
|
||
function resume() {
|
||
|
||
const wasPaused = dom.wrapper.classList.contains( 'paused' );
|
||
dom.wrapper.classList.remove( 'paused' );
|
||
|
||
cueAutoSlide();
|
||
|
||
if( wasPaused ) {
|
||
dispatchEvent({ type: 'resumed' });
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Toggles the paused mode on and off.
|
||
*/
|
||
function togglePause( override ) {
|
||
|
||
if( typeof override === 'boolean' ) {
|
||
override ? pause() : resume();
|
||
}
|
||
else {
|
||
isPaused() ? resume() : pause();
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Checks if we are currently in the paused mode.
|
||
*
|
||
* @return {Boolean}
|
||
*/
|
||
function isPaused() {
|
||
|
||
return dom.wrapper.classList.contains( 'paused' );
|
||
|
||
}
|
||
|
||
/**
|
||
* Toggles the auto slide mode on and off.
|
||
*
|
||
* @param {Boolean} [override] Flag which sets the desired state.
|
||
* True means autoplay starts, false means it stops.
|
||
*/
|
||
|
||
function toggleAutoSlide( override ) {
|
||
|
||
if( typeof override === 'boolean' ) {
|
||
override ? resumeAutoSlide() : pauseAutoSlide();
|
||
}
|
||
|
||
else {
|
||
autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Checks if the auto slide mode is currently on.
|
||
*
|
||
* @return {Boolean}
|
||
*/
|
||
function isAutoSliding() {
|
||
|
||
return !!( autoSlide && !autoSlidePaused );
|
||
|
||
}
|
||
|
||
/**
|
||
* Steps from the current point in the presentation to the
|
||
* slide which matches the specified horizontal and vertical
|
||
* indices.
|
||
*
|
||
* @param {number} [h=indexh] Horizontal index of the target slide
|
||
* @param {number} [v=indexv] Vertical index of the target slide
|
||
* @param {number} [f] Index of a fragment within the
|
||
* target slide to activate
|
||
* @param {number} [o] Origin for use in multimaster environments
|
||
*/
|
||
function slide( h, v, f, o ) {
|
||
|
||
// Remember where we were at before
|
||
previousSlide = currentSlide;
|
||
|
||
// Query all horizontal slides in the deck
|
||
const horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
|
||
|
||
// Abort if there are no slides
|
||
if( horizontalSlides.length === 0 ) return;
|
||
|
||
// If no vertical index is specified and the upcoming slide is a
|
||
// stack, resume at its previous vertical index
|
||
if( v === undefined && !overview.isActive() ) {
|
||
v = getPreviousVerticalIndex( horizontalSlides[ h ] );
|
||
}
|
||
|
||
// If we were on a vertical stack, remember what vertical index
|
||
// it was on so we can resume at the same position when returning
|
||
if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
|
||
setPreviousVerticalIndex( previousSlide.parentNode, indexv );
|
||
}
|
||
|
||
// Remember the state before this slide
|
||
const stateBefore = state.concat();
|
||
|
||
// Reset the state array
|
||
state.length = 0;
|
||
|
||
let indexhBefore = indexh || 0,
|
||
indexvBefore = indexv || 0;
|
||
|
||
// Activate and transition to the new slide
|
||
indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
|
||
indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
|
||
|
||
// Dispatch an event if the slide changed
|
||
let slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
|
||
|
||
// Ensure that the previous slide is never the same as the current
|
||
if( !slideChanged ) previousSlide = null;
|
||
|
||
// Find the current horizontal slide and any possible vertical slides
|
||
// within it
|
||
let currentHorizontalSlide = horizontalSlides[ indexh ],
|
||
currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
|
||
|
||
// Store references to the previous and current slides
|
||
currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
|
||
|
||
let autoAnimateTransition = false;
|
||
|
||
// Detect if we're moving between two auto-animated slides
|
||
if( slideChanged && previousSlide && currentSlide && !overview.isActive() ) {
|
||
|
||
// If this is an auto-animated transition, we disable the
|
||
// regular slide transition
|
||
//
|
||
// Note 20-03-2020:
|
||
// This needs to happen before we update slide visibility,
|
||
// otherwise transitions will still run in Safari.
|
||
if( previousSlide.hasAttribute( 'data-auto-animate' ) && currentSlide.hasAttribute( 'data-auto-animate' ) ) {
|
||
autoAnimateTransition = true;
|
||
dom.slides.classList.add( 'disable-slide-transitions' );
|
||
}
|
||
|
||
transition = 'running';
|
||
|
||
}
|
||
|
||
// Update the visibility of slides now that the indices have changed
|
||
updateSlidesVisibility();
|
||
|
||
layout();
|
||
|
||
// Update the overview if it's currently active
|
||
if( overview.isActive() ) {
|
||
overview.update();
|
||
}
|
||
|
||
// Show fragment, if specified
|
||
if( typeof f !== 'undefined' ) {
|
||
fragments.goto( f );
|
||
}
|
||
|
||
// Solves an edge case where the previous slide maintains the
|
||
// 'present' class when navigating between adjacent vertical
|
||
// stacks
|
||
if( previousSlide && previousSlide !== currentSlide ) {
|
||
previousSlide.classList.remove( 'present' );
|
||
previousSlide.setAttribute( 'aria-hidden', 'true' );
|
||
|
||
// Reset all slides upon navigate to home
|
||
if( isFirstSlide() ) {
|
||
// Launch async task
|
||
setTimeout( () => {
|
||
getVerticalStacks().forEach( slide => {
|
||
setPreviousVerticalIndex( slide, 0 );
|
||
} );
|
||
}, 0 );
|
||
}
|
||
}
|
||
|
||
// Apply the new state
|
||
stateLoop: for( let i = 0, len = state.length; i < len; i++ ) {
|
||
// Check if this state existed on the previous slide. If it
|
||
// did, we will avoid adding it repeatedly
|
||
for( let j = 0; j < stateBefore.length; j++ ) {
|
||
if( stateBefore[j] === state[i] ) {
|
||
stateBefore.splice( j, 1 );
|
||
continue stateLoop;
|
||
}
|
||
}
|
||
|
||
dom.viewport.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 ) {
|
||
dom.viewport.classList.remove( stateBefore.pop() );
|
||
}
|
||
|
||
if( slideChanged ) {
|
||
dispatchEvent({
|
||
type: 'slidechanged',
|
||
data: {
|
||
indexh,
|
||
indexv,
|
||
previousSlide,
|
||
currentSlide,
|
||
origin: o
|
||
}
|
||
});
|
||
}
|
||
|
||
// Handle embedded content
|
||
if( slideChanged || !previousSlide ) {
|
||
slideContent.stopEmbeddedContent( previousSlide );
|
||
slideContent.startEmbeddedContent( currentSlide );
|
||
}
|
||
|
||
// Announce the current slide contents to screen readers
|
||
announceStatus( getStatusText( currentSlide ) );
|
||
|
||
progress.update();
|
||
controls.update();
|
||
notes.update();
|
||
backgrounds.update();
|
||
backgrounds.updateParallax();
|
||
slideNumber.update();
|
||
fragments.update();
|
||
|
||
// Update the URL hash
|
||
location.writeURL();
|
||
|
||
cueAutoSlide();
|
||
|
||
// Auto-animation
|
||
if( autoAnimateTransition ) {
|
||
|
||
setTimeout( () => {
|
||
dom.slides.classList.remove( 'disable-slide-transitions' );
|
||
}, 0 );
|
||
|
||
if( config.autoAnimate ) {
|
||
// Run the auto-animation between our slides
|
||
autoAnimate.run( previousSlide, currentSlide );
|
||
}
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Syncs the presentation with the current DOM. Useful
|
||
* when new slides or control elements are added or when
|
||
* the configuration has changed.
|
||
*/
|
||
function sync() {
|
||
|
||
// Subscribe to input
|
||
removeEventListeners();
|
||
addEventListeners();
|
||
|
||
// Force a layout to make sure the current config is accounted for
|
||
layout();
|
||
|
||
// Reflect the current autoSlide value
|
||
autoSlide = config.autoSlide;
|
||
|
||
// Start auto-sliding if it's enabled
|
||
cueAutoSlide();
|
||
|
||
// Re-create all slide backgrounds
|
||
backgrounds.create();
|
||
|
||
// Write the current hash to the URL
|
||
location.writeURL();
|
||
|
||
fragments.sortAll();
|
||
|
||
controls.update();
|
||
progress.update();
|
||
|
||
updateSlidesVisibility();
|
||
|
||
notes.update();
|
||
notes.updateVisibility();
|
||
backgrounds.update( true );
|
||
slideNumber.update();
|
||
slideContent.formatEmbeddedContent();
|
||
|
||
// Start or stop embedded content depending on global config
|
||
if( config.autoPlayMedia === false ) {
|
||
slideContent.stopEmbeddedContent( currentSlide, { unloadIframes: false } );
|
||
}
|
||
else {
|
||
slideContent.startEmbeddedContent( currentSlide );
|
||
}
|
||
|
||
if( overview.isActive() ) {
|
||
overview.layout();
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Updates reveal.js to keep in sync with new slide attributes. For
|
||
* example, if you add a new `data-background-image` you can call
|
||
* this to have reveal.js render the new background image.
|
||
*
|
||
* Similar to #sync() but more efficient when you only need to
|
||
* refresh a specific slide.
|
||
*
|
||
* @param {HTMLElement} slide
|
||
*/
|
||
function syncSlide( slide = currentSlide ) {
|
||
|
||
backgrounds.sync( slide );
|
||
fragments.sync( slide );
|
||
|
||
slideContent.load( slide );
|
||
|
||
backgrounds.update();
|
||
notes.update();
|
||
|
||
}
|
||
|
||
/**
|
||
* Resets all vertical slides so that only the first
|
||
* is visible.
|
||
*/
|
||
function resetVerticalSlides() {
|
||
|
||
getHorizontalSlides().forEach( horizontalSlide => {
|
||
|
||
Util.queryAll( horizontalSlide, 'section' ).forEach( ( verticalSlide, y ) => {
|
||
|
||
if( y > 0 ) {
|
||
verticalSlide.classList.remove( 'present' );
|
||
verticalSlide.classList.remove( 'past' );
|
||
verticalSlide.classList.add( 'future' );
|
||
verticalSlide.setAttribute( 'aria-hidden', 'true' );
|
||
}
|
||
|
||
} );
|
||
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Randomly shuffles all slides in the deck.
|
||
*/
|
||
function shuffle() {
|
||
|
||
getHorizontalSlides().forEach( ( slide, i, slides ) => {
|
||
|
||
// Insert this slide next to another random slide. This may
|
||
// cause the slide to insert before itself but that's fine.
|
||
dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
|
||
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Updates one dimension of slides by showing the slide
|
||
* with the specified index.
|
||
*
|
||
* @param {string} selector A CSS selector that will fetch
|
||
* the group of slides we are working with
|
||
* @param {number} index The index of the slide that should be
|
||
* shown
|
||
*
|
||
* @return {number} The index of the slide that is now shown,
|
||
* might differ from the passed in index if it was out of
|
||
* bounds.
|
||
*/
|
||
function updateSlides( selector, index ) {
|
||
|
||
// Select all slides and convert the NodeList result to
|
||
// an array
|
||
let slides = Util.queryAll( dom.wrapper, selector ),
|
||
slidesLength = slides.length;
|
||
|
||
let printMode = print.isPrintingPDF();
|
||
|
||
if( slidesLength ) {
|
||
|
||
// Should the index loop?
|
||
if( config.loop ) {
|
||
index %= slidesLength;
|
||
|
||
if( index < 0 ) {
|
||
index = slidesLength + index;
|
||
}
|
||
}
|
||
|
||
// Enforce max and minimum index bounds
|
||
index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
|
||
|
||
for( let i = 0; i < slidesLength; i++ ) {
|
||
let element = slides[i];
|
||
|
||
let reverse = config.rtl && !isVerticalSlide( element );
|
||
|
||
element.classList.remove( 'past', 'present', 'future' );
|
||
|
||
// http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
|
||
element.setAttribute( 'hidden', '' );
|
||
element.setAttribute( 'aria-hidden', 'true' );
|
||
|
||
// If this element contains vertical slides
|
||
if( element.querySelector( 'section' ) ) {
|
||
element.classList.add( 'stack' );
|
||
}
|
||
|
||
// If we're printing static slides, all slides are "present"
|
||
if( printMode ) {
|
||
element.classList.add( 'present' );
|
||
continue;
|
||
}
|
||
|
||
if( i < index ) {
|
||
// Any element previous to index is given the 'past' class
|
||
element.classList.add( reverse ? 'future' : 'past' );
|
||
|
||
if( config.fragments ) {
|
||
// Show all fragments in prior slides
|
||
Util.queryAll( element, '.fragment' ).forEach( fragment => {
|
||
fragment.classList.add( 'visible' );
|
||
fragment.classList.remove( 'current-fragment' );
|
||
} );
|
||
}
|
||
}
|
||
else if( i > index ) {
|
||
// Any element subsequent to index is given the 'future' class
|
||
element.classList.add( reverse ? 'past' : 'future' );
|
||
|
||
if( config.fragments ) {
|
||
// Hide all fragments in future slides
|
||
Util.queryAll( element, '.fragment.visible' ).forEach( fragment => {
|
||
fragment.classList.remove( 'visible', 'current-fragment' );
|
||
} );
|
||
}
|
||
}
|
||
}
|
||
|
||
let slide = slides[index];
|
||
let wasPresent = slide.classList.contains( 'present' );
|
||
|
||
// Mark the current slide as present
|
||
slide.classList.add( 'present' );
|
||
slide.removeAttribute( 'hidden' );
|
||
slide.removeAttribute( 'aria-hidden' );
|
||
|
||
if( !wasPresent ) {
|
||
// Dispatch an event indicating the slide is now visible
|
||
dispatchEvent({
|
||
target: slide,
|
||
type: 'visible',
|
||
bubbles: false
|
||
});
|
||
}
|
||
|
||
// If this slide has a state associated with it, add it
|
||
// onto the current state of the deck
|
||
let slideState = slide.getAttribute( 'data-state' );
|
||
if( slideState ) {
|
||
state = state.concat( slideState.split( ' ' ) );
|
||
}
|
||
|
||
}
|
||
else {
|
||
// Since there are no slides we can't be anywhere beyond the
|
||
// zeroth index
|
||
index = 0;
|
||
}
|
||
|
||
return index;
|
||
|
||
}
|
||
|
||
/**
|
||
* Optimization method; hide all slides that are far away
|
||
* from the present slide.
|
||
*/
|
||
function updateSlidesVisibility() {
|
||
|
||
// Select all slides and convert the NodeList result to
|
||
// an array
|
||
let horizontalSlides = getHorizontalSlides(),
|
||
horizontalSlidesLength = horizontalSlides.length,
|
||
distanceX,
|
||
distanceY;
|
||
|
||
if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
|
||
|
||
// The number of steps away from the present slide that will
|
||
// be visible
|
||
let viewDistance = overview.isActive() ? 10 : config.viewDistance;
|
||
|
||
// Shorten the view distance on devices that typically have
|
||
// less resources
|
||
if( Device.isMobile ) {
|
||
viewDistance = overview.isActive() ? 6 : config.mobileViewDistance;
|
||
}
|
||
|
||
// All slides need to be visible when exporting to PDF
|
||
if( print.isPrintingPDF() ) {
|
||
viewDistance = Number.MAX_VALUE;
|
||
}
|
||
|
||
for( let x = 0; x < horizontalSlidesLength; x++ ) {
|
||
let horizontalSlide = horizontalSlides[x];
|
||
|
||
let verticalSlides = Util.queryAll( horizontalSlide, 'section' ),
|
||
verticalSlidesLength = verticalSlides.length;
|
||
|
||
// Determine how far away this slide is from the present
|
||
distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
|
||
|
||
// If the presentation is looped, distance should measure
|
||
// 1 between the first and last slides
|
||
if( config.loop ) {
|
||
distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
|
||
}
|
||
|
||
// Show the horizontal slide if it's within the view distance
|
||
if( distanceX < viewDistance ) {
|
||
slideContent.load( horizontalSlide );
|
||
}
|
||
else {
|
||
slideContent.unload( horizontalSlide );
|
||
}
|
||
|
||
if( verticalSlidesLength ) {
|
||
|
||
let oy = getPreviousVerticalIndex( horizontalSlide );
|
||
|
||
for( let y = 0; y < verticalSlidesLength; y++ ) {
|
||
let verticalSlide = verticalSlides[y];
|
||
|
||
distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
|
||
|
||
if( distanceX + distanceY < viewDistance ) {
|
||
slideContent.load( verticalSlide );
|
||
}
|
||
else {
|
||
slideContent.unload( verticalSlide );
|
||
}
|
||
}
|
||
|
||
}
|
||
}
|
||
|
||
// Flag if there are ANY vertical slides, anywhere in the deck
|
||
if( hasVerticalSlides() ) {
|
||
dom.wrapper.classList.add( 'has-vertical-slides' );
|
||
}
|
||
else {
|
||
dom.wrapper.classList.remove( 'has-vertical-slides' );
|
||
}
|
||
|
||
// Flag if there are ANY horizontal slides, anywhere in the deck
|
||
if( hasHorizontalSlides() ) {
|
||
dom.wrapper.classList.add( 'has-horizontal-slides' );
|
||
}
|
||
else {
|
||
dom.wrapper.classList.remove( 'has-horizontal-slides' );
|
||
}
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Determine what available routes there are for navigation.
|
||
*
|
||
* @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
|
||
*/
|
||
function availableRoutes({ includeFragments = false } = {}) {
|
||
|
||
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;
|
||
}
|
||
|
||
// If includeFragments is set, a route will be considered
|
||
// availalbe if either a slid OR fragment is available in
|
||
// the given direction
|
||
if( includeFragments === true ) {
|
||
let fragmentRoutes = fragments.availableRoutes();
|
||
routes.left = routes.left || fragmentRoutes.prev;
|
||
routes.up = routes.up || fragmentRoutes.prev;
|
||
routes.down = routes.down || fragmentRoutes.next;
|
||
routes.right = routes.right || fragmentRoutes.next;
|
||
}
|
||
|
||
// Reverse horizontal controls for rtl
|
||
if( config.rtl ) {
|
||
let left = routes.left;
|
||
routes.left = routes.right;
|
||
routes.right = left;
|
||
}
|
||
|
||
return routes;
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns the number of past slides. This can be used as a global
|
||
* flattened index for slides.
|
||
*
|
||
* @param {HTMLElement} [slide=currentSlide] The slide we're counting before
|
||
*
|
||
* @return {number} Past slide count
|
||
*/
|
||
function getSlidePastCount( slide = currentSlide ) {
|
||
|
||
let horizontalSlides = getHorizontalSlides();
|
||
|
||
// The number of past slides
|
||
let pastCount = 0;
|
||
|
||
// Step through all slides and count the past ones
|
||
mainLoop: for( let i = 0; i < horizontalSlides.length; i++ ) {
|
||
|
||
let horizontalSlide = horizontalSlides[i];
|
||
let verticalSlides = horizontalSlide.querySelectorAll( 'section' );
|
||
|
||
for( let j = 0; j < verticalSlides.length; j++ ) {
|
||
|
||
// Stop as soon as we arrive at the present
|
||
if( verticalSlides[j] === slide ) {
|
||
break mainLoop;
|
||
}
|
||
|
||
// Don't count slides with the "uncounted" class
|
||
if( verticalSlides[j].dataset.visibility !== 'uncounted' ) {
|
||
pastCount++;
|
||
}
|
||
|
||
}
|
||
|
||
// Stop as soon as we arrive at the present
|
||
if( horizontalSlide === slide ) {
|
||
break;
|
||
}
|
||
|
||
// Don't count the wrapping section for vertical slides and
|
||
// slides marked as uncounted
|
||
if( horizontalSlide.classList.contains( 'stack' ) === false && !horizontalSlide.dataset.visibility !== 'uncounted' ) {
|
||
pastCount++;
|
||
}
|
||
|
||
}
|
||
|
||
return pastCount;
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns a value ranging from 0-1 that represents
|
||
* how far into the presentation we have navigated.
|
||
*
|
||
* @return {number}
|
||
*/
|
||
function getProgress() {
|
||
|
||
// The number of past and total slides
|
||
let totalCount = getTotalSlides();
|
||
let pastCount = getSlidePastCount();
|
||
|
||
if( currentSlide ) {
|
||
|
||
let allFragments = currentSlide.querySelectorAll( '.fragment' );
|
||
|
||
// If there are fragments in the current slide those should be
|
||
// accounted for in the progress.
|
||
if( allFragments.length > 0 ) {
|
||
let visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
|
||
|
||
// This value represents how big a portion of the slide progress
|
||
// that is made up by its fragments (0-1)
|
||
let fragmentWeight = 0.9;
|
||
|
||
// Add fragment progress to the past slide count
|
||
pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
|
||
}
|
||
|
||
}
|
||
|
||
return Math.min( pastCount / ( totalCount - 1 ), 1 );
|
||
|
||
}
|
||
|
||
/**
|
||
* Retrieves the h/v location and fragment of the current,
|
||
* or specified, slide.
|
||
*
|
||
* @param {HTMLElement} [slide] If specified, the returned
|
||
* index will be for this slide rather than the currently
|
||
* active one
|
||
*
|
||
* @return {{h: number, v: number, f: number}}
|
||
*/
|
||
function getIndices( slide ) {
|
||
|
||
// By default, return the current indices
|
||
let h = indexh,
|
||
v = indexv,
|
||
f;
|
||
|
||
// If a slide is specified, return the indices of that slide
|
||
if( slide ) {
|
||
let isVertical = isVerticalSlide( slide );
|
||
let slideh = isVertical ? slide.parentNode : slide;
|
||
|
||
// Select all horizontal slides
|
||
let horizontalSlides = getHorizontalSlides();
|
||
|
||
// Now that we know which the horizontal slide is, get its index
|
||
h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
|
||
|
||
// Assume we're not vertical
|
||
v = undefined;
|
||
|
||
// If this is a vertical slide, grab the vertical index
|
||
if( isVertical ) {
|
||
v = Math.max( Util.queryAll( slide.parentNode, 'section' ).indexOf( slide ), 0 );
|
||
}
|
||
}
|
||
|
||
if( !slide && currentSlide ) {
|
||
let hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
|
||
if( hasFragments ) {
|
||
let currentFragment = currentSlide.querySelector( '.current-fragment' );
|
||
if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
|
||
f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
|
||
}
|
||
else {
|
||
f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
|
||
}
|
||
}
|
||
}
|
||
|
||
return { h, v, f };
|
||
|
||
}
|
||
|
||
/**
|
||
* Retrieves all slides in this presentation.
|
||
*/
|
||
function getSlides() {
|
||
|
||
return Util.queryAll( dom.wrapper, SLIDES_SELECTOR + ':not(.stack):not([data-visibility="uncounted"])' );
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns a list of all horizontal slides in the deck. Each
|
||
* vertical stack is included as one horizontal slide in the
|
||
* resulting array.
|
||
*/
|
||
function getHorizontalSlides() {
|
||
|
||
return Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR );
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns all vertical slides that exist within this deck.
|
||
*/
|
||
function getVerticalSlides() {
|
||
|
||
return Util.queryAll( dom.wrapper, '.slides>section>section' );
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns all vertical stacks (each stack can contain multiple slides).
|
||
*/
|
||
function getVerticalStacks() {
|
||
|
||
return Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.stack');
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns true if there are at least two horizontal slides.
|
||
*/
|
||
function hasHorizontalSlides() {
|
||
|
||
return getHorizontalSlides().length > 1;
|
||
}
|
||
|
||
/**
|
||
* Returns true if there are at least two vertical slides.
|
||
*/
|
||
function hasVerticalSlides() {
|
||
|
||
return getVerticalSlides().length > 1;
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns an array of objects where each object represents the
|
||
* attributes on its respective slide.
|
||
*/
|
||
function getSlidesAttributes() {
|
||
|
||
return getSlides().map( slide => {
|
||
|
||
let attributes = {};
|
||
for( let i = 0; i < slide.attributes.length; i++ ) {
|
||
let attribute = slide.attributes[ i ];
|
||
attributes[ attribute.name ] = attribute.value;
|
||
}
|
||
return attributes;
|
||
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Retrieves the total number of slides in this presentation.
|
||
*
|
||
* @return {number}
|
||
*/
|
||
function getTotalSlides() {
|
||
|
||
return getSlides().length;
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns the slide element matching the specified index.
|
||
*
|
||
* @return {HTMLElement}
|
||
*/
|
||
function getSlide( x, y ) {
|
||
|
||
let horizontalSlide = getHorizontalSlides()[ x ];
|
||
let verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
|
||
|
||
if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
|
||
return verticalSlides ? verticalSlides[ y ] : undefined;
|
||
}
|
||
|
||
return horizontalSlide;
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns the background element for the given slide.
|
||
* All slides, even the ones with no background properties
|
||
* defined, have a background element so as long as the
|
||
* index is valid an element will be returned.
|
||
*
|
||
* @param {mixed} x Horizontal background index OR a slide
|
||
* HTML element
|
||
* @param {number} y Vertical background index
|
||
* @return {(HTMLElement[]|*)}
|
||
*/
|
||
function getSlideBackground( x, y ) {
|
||
|
||
let slide = typeof x === 'number' ? getSlide( x, y ) : x;
|
||
if( slide ) {
|
||
return slide.slideBackgroundElement;
|
||
}
|
||
|
||
return undefined;
|
||
|
||
}
|
||
|
||
/**
|
||
* Retrieves the current state of the presentation as
|
||
* an object. This state can then be restored at any
|
||
* time.
|
||
*
|
||
* @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
|
||
*/
|
||
function getState() {
|
||
|
||
let indices = getIndices();
|
||
|
||
return {
|
||
indexh: indices.h,
|
||
indexv: indices.v,
|
||
indexf: indices.f,
|
||
paused: isPaused(),
|
||
overview: overview.isActive()
|
||
};
|
||
|
||
}
|
||
|
||
/**
|
||
* Restores the presentation to the given state.
|
||
*
|
||
* @param {object} state As generated by getState()
|
||
* @see {@link getState} generates the parameter `state`
|
||
*/
|
||
function setState( state ) {
|
||
|
||
if( typeof state === 'object' ) {
|
||
slide( Util.deserialize( state.indexh ), Util.deserialize( state.indexv ), Util.deserialize( state.indexf ) );
|
||
|
||
let pausedFlag = Util.deserialize( state.paused ),
|
||
overviewFlag = Util.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 ) {
|
||
Util.queryAll( currentSlide, 'video, audio' ).forEach( el => {
|
||
if( el.hasAttribute( 'data-autoplay' ) ) {
|
||
if( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {
|
||
autoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;
|
||
}
|
||
}
|
||
} );
|
||
}
|
||
|
||
// Cue the next auto-slide if:
|
||
// - There is an autoSlide value
|
||
// - Auto-sliding isn't paused by the user
|
||
// - The presentation isn't paused
|
||
// - The overview isn't active
|
||
// - The presentation isn't over
|
||
if( autoSlide && !autoSlidePaused && !isPaused() && !overview.isActive() && ( !isLastSlide() || fragments.availableRoutes().next || config.loop === true ) ) {
|
||
autoSlideTimeout = setTimeout( () => {
|
||
if( typeof config.autoSlideMethod === 'function' ) {
|
||
config.autoSlideMethod()
|
||
}
|
||
else {
|
||
navigateNext();
|
||
}
|
||
cueAutoSlide();
|
||
}, autoSlide );
|
||
autoSlideStartTime = Date.now();
|
||
}
|
||
|
||
if( autoSlidePlayer ) {
|
||
autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
|
||
}
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Cancels any ongoing request to auto-slide.
|
||
*/
|
||
function cancelAutoSlide() {
|
||
|
||
clearTimeout( autoSlideTimeout );
|
||
autoSlideTimeout = -1;
|
||
|
||
}
|
||
|
||
function pauseAutoSlide() {
|
||
|
||
if( autoSlide && !autoSlidePaused ) {
|
||
autoSlidePaused = true;
|
||
dispatchEvent({ type: 'autoslidepaused' });
|
||
clearTimeout( autoSlideTimeout );
|
||
|
||
if( autoSlidePlayer ) {
|
||
autoSlidePlayer.setPlaying( false );
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
function resumeAutoSlide() {
|
||
|
||
if( autoSlide && autoSlidePaused ) {
|
||
autoSlidePaused = false;
|
||
dispatchEvent({ type: 'autoslideresumed' });
|
||
cueAutoSlide();
|
||
}
|
||
|
||
}
|
||
|
||
function navigateLeft() {
|
||
|
||
navigationHistory.hasNavigatedHorizontally = true;
|
||
|
||
// Reverse for RTL
|
||
if( config.rtl ) {
|
||
if( ( overview.isActive() || fragments.next() === false ) && availableRoutes().left ) {
|
||
slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
|
||
}
|
||
}
|
||
// Normal navigation
|
||
else if( ( overview.isActive() || fragments.prev() === false ) && availableRoutes().left ) {
|
||
slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
|
||
}
|
||
|
||
}
|
||
|
||
function navigateRight() {
|
||
|
||
navigationHistory.hasNavigatedHorizontally = true;
|
||
|
||
// Reverse for RTL
|
||
if( config.rtl ) {
|
||
if( ( overview.isActive() || fragments.prev() === false ) && availableRoutes().right ) {
|
||
slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
|
||
}
|
||
}
|
||
// Normal navigation
|
||
else if( ( overview.isActive() || fragments.next() === false ) && availableRoutes().right ) {
|
||
slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
|
||
}
|
||
|
||
}
|
||
|
||
function navigateUp() {
|
||
|
||
// Prioritize hiding fragments
|
||
if( ( overview.isActive() || fragments.prev() === false ) && availableRoutes().up ) {
|
||
slide( indexh, indexv - 1 );
|
||
}
|
||
|
||
}
|
||
|
||
function navigateDown() {
|
||
|
||
navigationHistory.hasNavigatedVertically = true;
|
||
|
||
// Prioritize revealing fragments
|
||
if( ( overview.isActive() || fragments.next() === false ) && availableRoutes().down ) {
|
||
slide( indexh, indexv + 1 );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Navigates backwards, prioritized in the following order:
|
||
* 1) Previous fragment
|
||
* 2) Previous vertical slide
|
||
* 3) Previous horizontal slide
|
||
*/
|
||
function navigatePrev() {
|
||
|
||
// Prioritize revealing fragments
|
||
if( fragments.prev() === false ) {
|
||
if( availableRoutes().up ) {
|
||
navigateUp();
|
||
}
|
||
else {
|
||
// Fetch the previous horizontal slide, if there is one
|
||
let previousSlide;
|
||
|
||
if( config.rtl ) {
|
||
previousSlide = Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.future' ).pop();
|
||
}
|
||
else {
|
||
previousSlide = Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.past' ).pop();
|
||
}
|
||
|
||
if( previousSlide ) {
|
||
let v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
|
||
let h = indexh - 1;
|
||
slide( h, v );
|
||
}
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* The reverse of #navigatePrev().
|
||
*/
|
||
function navigateNext() {
|
||
|
||
navigationHistory.hasNavigatedHorizontally = true;
|
||
navigationHistory.hasNavigatedVertically = true;
|
||
|
||
// Prioritize revealing fragments
|
||
if( fragments.next() === false ) {
|
||
|
||
let routes = availableRoutes();
|
||
|
||
// When looping is enabled `routes.down` is always available
|
||
// so we need a separate check for when we've reached the
|
||
// end of a stack and should move horizontally
|
||
if( routes.down && routes.right && config.loop && isLastVerticalSlide( currentSlide ) ) {
|
||
routes.down = false;
|
||
}
|
||
|
||
if( routes.down ) {
|
||
navigateDown();
|
||
}
|
||
else if( config.rtl ) {
|
||
navigateLeft();
|
||
}
|
||
else {
|
||
navigateRight();
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
|
||
// --------------------------------------------------------------------//
|
||
// ----------------------------- EVENTS -------------------------------//
|
||
// --------------------------------------------------------------------//
|
||
|
||
/**
|
||
* Called by all event handlers that are based on user
|
||
* input.
|
||
*
|
||
* @param {object} [event]
|
||
*/
|
||
function onUserInput( event ) {
|
||
|
||
if( config.autoSlideStoppable ) {
|
||
pauseAutoSlide();
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Event listener for transition end on the current slide.
|
||
*
|
||
* @param {object} [event]
|
||
*/
|
||
function onTransitionEnd( event ) {
|
||
|
||
if( transition === 'running' && /section/gi.test( event.target.nodeName ) ) {
|
||
transition = 'idle';
|
||
dispatchEvent({
|
||
type: 'slidetransitionend',
|
||
data: { indexh, indexv, previousSlide, currentSlide }
|
||
});
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* 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();
|
||
}
|
||
|
||
}
|
||
|
||
|
||
// --------------------------------------------------------------------//
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// ------------------------------- API --------------------------------//
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// --------------------------------------------------------------------//
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// The public reveal.js API
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const API = {
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VERSION,
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initialize,
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configure,
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sync,
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syncSlide,
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syncFragments: fragments.sync.bind( fragments ),
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// Navigation methods
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slide,
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left: navigateLeft,
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right: navigateRight,
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up: navigateUp,
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down: navigateDown,
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prev: navigatePrev,
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next: navigateNext,
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// Navigation aliases
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navigateLeft, navigateRight, navigateUp, navigateDown, navigatePrev, navigateNext,
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// Fragment methods
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navigateFragment: fragments.goto.bind( fragments ),
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prevFragment: fragments.prev.bind( fragments ),
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nextFragment: fragments.next.bind( fragments ),
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// Event binding
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on,
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off,
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// Legacy event binding methods left in for backwards compatibility
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addEventListener: on,
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removeEventListener: off,
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// Forces an update in slide layout
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layout,
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// Randomizes the order of slides
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shuffle,
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// Returns an object with the available routes as booleans (left/right/top/bottom)
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availableRoutes,
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// Returns an object with the available fragments as booleans (prev/next)
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availableFragments: fragments.availableRoutes.bind( fragments ),
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// Toggles a help overlay with keyboard shortcuts
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toggleHelp,
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// Toggles the overview mode on/off
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toggleOverview: overview.toggle.bind( overview ),
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// Toggles the "black screen" mode on/off
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togglePause,
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// Toggles the auto slide mode on/off
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toggleAutoSlide,
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// Slide navigation checks
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isFirstSlide,
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isLastSlide,
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isLastVerticalSlide,
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isVerticalSlide,
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// State checks
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isPaused,
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isAutoSliding,
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isSpeakerNotes: notes.isSpeakerNotesWindow.bind( notes ),
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isOverview: overview.isActive.bind( overview ),
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isPrintingPDF: print.isPrintingPDF.bind( print ),
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// Checks if reveal.js has been loaded and is ready for use
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isReady: () => ready,
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// Slide preloading
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loadSlide: slideContent.load.bind( slideContent ),
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unloadSlide: slideContent.unload.bind( slideContent ),
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// Adds or removes all internal event listeners
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addEventListeners,
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removeEventListeners,
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dispatchEvent,
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// Facility for persisting and restoring the presentation state
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getState,
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setState,
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// Presentation progress on range of 0-1
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getProgress,
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// Returns the indices of the current, or specified, slide
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getIndices,
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// Returns an Array of key:value maps of the attributes of each
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// slide in the deck
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getSlidesAttributes,
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// Returns the number of slides that we have passed
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getSlidePastCount,
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// Returns the total number of slides
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getTotalSlides,
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// Returns the slide element at the specified index
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getSlide,
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// Returns the previous slide element, may be null
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getPreviousSlide: () => previousSlide,
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// Returns the current slide element
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getCurrentSlide: () => currentSlide,
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// Returns the slide background element at the specified index
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getSlideBackground,
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// Returns the speaker notes string for a slide, or null
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getSlideNotes: notes.getSlideNotes.bind( notes ),
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// Returns an Array of all slides
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getSlides,
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// Returns an array with all horizontal/vertical slides in the deck
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getHorizontalSlides,
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getVerticalSlides,
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// Checks if the presentation contains two or more horizontal
|
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// and vertical slides
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hasHorizontalSlides,
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hasVerticalSlides,
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// Checks if the deck has navigated on either axis at least once
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hasNavigatedHorizontally: () => navigationHistory.hasNavigatedHorizontally,
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hasNavigatedVertically: () => navigationHistory.hasNavigatedVertically,
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// Adds/removes a custom key binding
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addKeyBinding: keyboard.addKeyBinding.bind( keyboard ),
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removeKeyBinding: keyboard.removeKeyBinding.bind( keyboard ),
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||
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// Programmatically triggers a keyboard event
|
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triggerKey: keyboard.triggerKey.bind( keyboard ),
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// Registers a new shortcut to include in the help overlay
|
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registerKeyboardShortcut: keyboard.registerKeyboardShortcut.bind( keyboard ),
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getComputedSlideSize,
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// Returns the current scale of the presentation content
|
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getScale: () => scale,
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// Returns the current configuration object
|
||
getConfig: () => config,
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||
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// Helper method, retrieves query string as a key:value map
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getQueryHash: Util.getQueryHash,
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// Returns reveal.js DOM elements
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getRevealElement: () => revealElement,
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getSlidesElement: () => dom.slides,
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getViewportElement: () => dom.viewport,
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getBackgroundsElement: () => backgrounds.element,
|
||
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// API for registering and retrieving plugins
|
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registerPlugin: plugins.registerPlugin.bind( plugins ),
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hasPlugin: plugins.hasPlugin.bind( plugins ),
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getPlugin: plugins.getPlugin.bind( plugins ),
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getPlugins: plugins.getRegisteredPlugins.bind( plugins )
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||
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};
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||
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// Our internal API which controllers have access to
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Util.extend( Reveal, {
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...API,
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||
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// Methods for announcing content to screen readers
|
||
announceStatus,
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||
getStatusText,
|
||
|
||
// Controllers
|
||
print,
|
||
progress,
|
||
controls,
|
||
location,
|
||
overview,
|
||
fragments,
|
||
slideContent,
|
||
slideNumber,
|
||
|
||
onUserInput,
|
||
closeOverlay,
|
||
updateSlidesVisibility,
|
||
layoutSlideContents,
|
||
transformSlides,
|
||
cueAutoSlide,
|
||
cancelAutoSlide
|
||
} );
|
||
|
||
return API;
|
||
|
||
};
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