1470 lines
41 KiB
JavaScript
1470 lines
41 KiB
JavaScript
/*!
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* reveal.js 2.2 r39
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* http://lab.hakim.se/reveal-js
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* MIT licensed
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*
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* Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
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*/
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var Reveal = (function(){
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'use strict';
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var HORIZONTAL_SLIDES_SELECTOR = '.reveal .slides>section',
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VERTICAL_SLIDES_SELECTOR = '.reveal .slides>section.present>section',
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// Configurations defaults, can be overridden at initialization time
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config = {
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// Display controls in the bottom right corner
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controls: true,
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// Display a presentation progress bar
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progress: true,
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// Push each slide change to the browser history
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history: false,
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// Enable keyboard shortcuts for navigation
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keyboard: true,
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// Enable the slide overview mode
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overview: true,
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// Vertical centering of slides
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center: false,
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// Loop the presentation
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loop: false,
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// Number of milliseconds between automatically proceeding to the
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// next slide, disabled when set to 0, this value can be overwritten
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// by using a data-autoslide attribute on your slides
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autoSlide: 0,
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// Enable slide navigation via mouse wheel
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mouseWheel: true,
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// Apply a 3D roll to links on hover
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rollingLinks: true,
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// Transition style (see /css/theme)
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theme: null,
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// Transition style
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transition: 'default', // default/cube/page/concave/zoom/linear/none
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// Script dependencies to load
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dependencies: []
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},
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// Stores if the next slide should be shown automatically
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// after n milliseconds
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autoSlide = config.autoSlide,
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// The horizontal and verical index of the currently active slide
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indexh = 0,
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indexv = 0,
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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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// Slides may hold a data-state attribute which we pick up and apply
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// as a class to the body. This list contains the combined state of
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// all current slides.
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state = [],
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// Cached references to DOM elements
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dom = {},
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// Detect support for CSS 3D transforms
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supports3DTransforms = 'WebkitPerspective' in document.body.style ||
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'MozPerspective' in document.body.style ||
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'msPerspective' in document.body.style ||
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'OPerspective' in document.body.style ||
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'perspective' in document.body.style,
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supports2DTransforms = 'WebkitTransform' in document.body.style ||
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'MozTransform' in document.body.style ||
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'msTransform' in document.body.style ||
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'OTransform' in document.body.style ||
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'transform' in document.body.style,
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// Throttles mouse wheel navigation
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mouseWheelTimeout = 0,
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// An interval used to automatically move on to the next slide
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autoSlideTimeout = 0,
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// Delays updates to the URL due to a Chrome thumbnailer bug
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writeURLTimeout = 0,
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// Holds information about the currently ongoing touch input
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touch = {
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startX: 0,
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startY: 0,
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startSpan: 0,
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startCount: 0,
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handled: false,
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threshold: 80
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};
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/**
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* Starts up the presentation if the client is capable.
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*/
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function initialize( options ) {
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if( ( !supports2DTransforms && !supports3DTransforms ) ) {
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document.body.setAttribute( 'class', 'no-transforms' );
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// If the browser doesn't support core features we won't be
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// using JavaScript to control the presentation
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return;
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}
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// Copy options over to our config object
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extend( config, options );
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// Hide the address bar in mobile browsers
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hideAddressBar();
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// Loads the dependencies and continues to #start() once done
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load();
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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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// Cache references to key DOM elements
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dom.theme = document.querySelector( '#theme' );
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dom.wrapper = document.querySelector( '.reveal' );
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// Progress bar
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if( !dom.wrapper.querySelector( '.progress' ) && config.progress ) {
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var progressElement = document.createElement( 'div' );
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progressElement.classList.add( 'progress' );
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progressElement.innerHTML = '<span></span>';
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dom.wrapper.appendChild( progressElement );
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}
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// Arrow controls
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if( !dom.wrapper.querySelector( '.controls' ) && config.controls ) {
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var controlsElement = document.createElement( 'aside' );
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controlsElement.classList.add( 'controls' );
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controlsElement.innerHTML = '<div class="navigate-left"></div>' +
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'<div class="navigate-right"></div>' +
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'<div class="navigate-up"></div>' +
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'<div class="navigate-down"></div>';
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dom.wrapper.appendChild( controlsElement );
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}
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// Presentation background element
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if( !dom.wrapper.querySelector( '.state-background' ) ) {
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var backgroundElement = document.createElement( 'div' );
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backgroundElement.classList.add( 'state-background' );
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dom.wrapper.appendChild( backgroundElement );
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}
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// Overlay graphic which is displayed during the paused mode
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if( !dom.wrapper.querySelector( '.pause-overlay' ) ) {
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var pausedElement = document.createElement( 'div' );
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pausedElement.classList.add( 'pause-overlay' );
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dom.wrapper.appendChild( pausedElement );
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}
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// Cache references to elements
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dom.progress = document.querySelector( '.reveal .progress' );
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dom.progressbar = document.querySelector( '.reveal .progress span' );
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if ( config.controls ) {
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dom.controls = document.querySelector( '.reveal .controls' );
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// There can be multiple instances of controls throughout the page
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dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
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dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
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dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
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dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
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dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
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dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
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}
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}
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/**
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* Hides the address bar if we're on a mobile device.
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*/
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function hideAddressBar() {
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if( navigator.userAgent.match( /(iphone|ipod|android)/i ) ) {
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// Give the page some scrollable overflow
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document.documentElement.style.overflow = 'scroll';
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document.body.style.height = '120%';
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// Events that should trigger the address bar to hide
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window.addEventListener( 'load', removeAddressBar, false );
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window.addEventListener( 'orientationchange', removeAddressBar, false );
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}
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}
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/**
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* Loads the dependencies of reveal.js. Dependencies are
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* defined via the configuration option 'dependencies'
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* and will be loaded prior to starting/binding reveal.js.
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* Some dependencies may have an 'async' flag, if so they
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* will load after reveal.js has been started up.
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*/
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function load() {
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var scripts = [],
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scriptsAsync = [];
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for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
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var s = config.dependencies[i];
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// Load if there's no condition or the condition is truthy
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if( !s.condition || s.condition() ) {
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if( s.async ) {
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scriptsAsync.push( s.src );
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}
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else {
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scripts.push( s.src );
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}
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// Extension may contain callback functions
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if( typeof s.callback === 'function' ) {
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head.ready( s.src.match( /([\w\d_\-]*)\.?[^\\\/]*$/i )[0], s.callback );
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}
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}
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}
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// Called once synchronous scritps finish loading
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function proceed() {
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if( scriptsAsync.length ) {
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// Load asynchronous scripts
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head.js.apply( null, scriptsAsync );
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}
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start();
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}
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if( scripts.length ) {
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head.ready( proceed );
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// Load synchronous scripts
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head.js.apply( null, scripts );
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}
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else {
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proceed();
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}
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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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// Make sure we've got all the DOM elements we need
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setupDOM();
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// Subscribe to input
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addEventListeners();
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// Updates the presentation to match the current configuration values
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configure();
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// Force an initial layout, will thereafter be invoked as the window
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// is resized
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layout();
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// Read the initial hash
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readURL();
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// Start auto-sliding if it's enabled
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cueAutoSlide();
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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( function() {
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dispatchEvent( 'ready', {
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'indexh': indexh,
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'indexv': indexv,
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'currentSlide': currentSlide
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} );
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}, 1 );
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}
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/**
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* Applies the configuration settings from the config object.
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*/
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function configure() {
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if( supports3DTransforms === false ) {
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config.transition = 'linear';
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}
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if( config.controls && dom.controls ) {
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dom.controls.style.display = 'block';
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}
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if( config.progress && dom.progress ) {
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dom.progress.style.display = 'block';
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}
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if( config.transition !== 'default' ) {
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dom.wrapper.classList.add( config.transition );
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}
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if( config.center ) {
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dom.wrapper.classList.add( 'center' );
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}
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if( config.mouseWheel ) {
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document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
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document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
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}
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// 3D links
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if( config.rollingLinks ) {
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linkify();
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}
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// Load the theme in the config, if it's not already loaded
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if( config.theme && dom.theme ) {
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var themeURL = dom.theme.getAttribute( 'href' );
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var themeFinder = /[^\/]*?(?=\.css)/;
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var themeName = themeURL.match(themeFinder)[0];
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if( config.theme !== themeName ) {
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themeURL = themeURL.replace(themeFinder, config.theme);
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dom.theme.setAttribute( 'href', themeURL );
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}
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}
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}
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/**
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* Binds all event listeners.
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*/
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function addEventListeners() {
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document.addEventListener( 'touchstart', onDocumentTouchStart, false );
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document.addEventListener( 'touchmove', onDocumentTouchMove, false );
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document.addEventListener( 'touchend', onDocumentTouchEnd, false );
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window.addEventListener( 'hashchange', onWindowHashChange, false );
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window.addEventListener( 'resize', onWindowResize, false );
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if( config.keyboard ) {
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document.addEventListener( 'keydown', onDocumentKeyDown, false );
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}
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if ( config.progress && dom.progress ) {
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dom.progress.addEventListener( 'click', preventAndForward( onProgressClick ), false );
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}
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if ( config.controls && dom.controls ) {
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dom.controlsLeft.forEach( function( el ) { el.addEventListener( 'click', preventAndForward( navigateLeft ), false ); } );
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dom.controlsRight.forEach( function( el ) { el.addEventListener( 'click', preventAndForward( navigateRight ), false ); } );
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dom.controlsUp.forEach( function( el ) { el.addEventListener( 'click', preventAndForward( navigateUp ), false ); } );
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dom.controlsDown.forEach( function( el ) { el.addEventListener( 'click', preventAndForward( navigateDown ), false ); } );
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dom.controlsPrev.forEach( function( el ) { el.addEventListener( 'click', preventAndForward( navigatePrev ), false ); } );
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dom.controlsNext.forEach( function( el ) { el.addEventListener( 'click', preventAndForward( navigateNext ), false ); } );
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}
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}
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/**
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* Unbinds all event listeners.
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*/
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function removeEventListeners() {
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document.removeEventListener( 'keydown', onDocumentKeyDown, false );
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document.removeEventListener( 'touchstart', onDocumentTouchStart, false );
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document.removeEventListener( 'touchmove', onDocumentTouchMove, false );
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document.removeEventListener( 'touchend', onDocumentTouchEnd, false );
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window.removeEventListener( 'hashchange', onWindowHashChange, false );
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window.removeEventListener( 'resize', onWindowResize, false );
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if ( config.progress && dom.progress ) {
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dom.progress.removeEventListener( 'click', preventAndForward( onProgressClick ), false );
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}
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if ( config.controls && dom.controls ) {
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dom.controlsLeft.forEach( function( el ) { el.removeEventListener( 'click', preventAndForward( navigateLeft ), false ); } );
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dom.controlsRight.forEach( function( el ) { el.removeEventListener( 'click', preventAndForward( navigateRight ), false ); } );
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dom.controlsUp.forEach( function( el ) { el.removeEventListener( 'click', preventAndForward( navigateUp ), false ); } );
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dom.controlsDown.forEach( function( el ) { el.removeEventListener( 'click', preventAndForward( navigateDown ), false ); } );
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dom.controlsPrev.forEach( function( el ) { el.removeEventListener( 'click', preventAndForward( navigatePrev ), false ); } );
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dom.controlsNext.forEach( function( el ) { el.removeEventListener( 'click', preventAndForward( navigateNext ), false ); } );
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}
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}
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/**
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* Extend object a with the properties of object b.
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* If there's a conflict, object b takes precedence.
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*/
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function extend( a, b ) {
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for( var i in b ) {
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a[ i ] = b[ i ];
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}
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}
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/**
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* Converts the target object to an array.
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*/
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function toArray( o ) {
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return Array.prototype.slice.call( o );
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}
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function each( targets, method, args ) {
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targets.forEach( function( el ) {
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el[method].apply( el, args );
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} );
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}
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/**
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* Measures the distance in pixels between point a
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* and point b.
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*
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* @param {Object} a point with x/y properties
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* @param {Object} b point with x/y properties
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*/
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function distanceBetween( a, b ) {
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var dx = a.x - b.x,
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dy = a.y - b.y;
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return Math.sqrt( dx*dx + dy*dy );
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}
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/**
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* Prevents an events defaults behavior calls the
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* specified delegate.
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*
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* @param {Function} delegate The method to call
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* after the wrapper has been executed
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*/
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function preventAndForward( delegate ) {
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return function( event ) {
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event.preventDefault();
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delegate.call( null, event );
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};
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}
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/**
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* Causes the address bar to hide on mobile devices,
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* more vertical space ftw.
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*/
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function removeAddressBar() {
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setTimeout( function() {
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window.scrollTo( 0, 1 );
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}, 0 );
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}
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/**
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* Dispatches an event of the specified type from the
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* reveal DOM element.
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*/
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function dispatchEvent( type, properties ) {
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var event = document.createEvent( "HTMLEvents", 1, 2 );
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event.initEvent( type, true, true );
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extend( event, properties );
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dom.wrapper.dispatchEvent( event );
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}
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/**
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* Wrap all links in 3D goodness.
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*/
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function linkify() {
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if( supports3DTransforms && !( 'msPerspective' in document.body.style ) ) {
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var nodes = document.querySelectorAll( '.reveal .slides section a:not(.image)' );
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for( var i = 0, len = nodes.length; i < len; i++ ) {
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var node = nodes[i];
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if( node.textContent && !node.querySelector( 'img' ) && ( !node.className || !node.classList.contains( node, 'roll' ) ) ) {
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node.classList.add( 'roll' );
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node.innerHTML = '<span data-title="'+ node.text +'">' + node.innerHTML + '</span>';
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}
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}
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}
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}
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/**
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* Applies JavaScript-controlled layout rules to the
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* presentation.
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*/
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function layout() {
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if( config.center ) {
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// Select all slides, vertical and horizontal
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var slides = Array.prototype.slice.call( document.querySelectorAll( '.reveal .slides section' ) );
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// Determine the minimum top offset for slides
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var minTop = -dom.wrapper.offsetHeight / 2;
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for( var i = 0, len = slides.length; i < len; i++ ) {
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var slide = slides[ i ];
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// Vertical stacks are not centered since their section
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// children will be
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if( slide.classList.contains( 'stack' ) ) {
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slide.style.top = 0;
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}
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else {
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slide.style.top = Math.max( - ( slide.offsetHeight / 2 ) - 20, minTop ) + 'px';
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}
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}
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}
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}
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/**
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* Displays the overview of slides (quick nav) by
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* scaling down and arranging all slide elements.
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*
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* Experimental feature, might be dropped if perf
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* can't be improved.
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*/
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function activateOverview() {
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// Only proceed if enabled in config
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if( config.overview ) {
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dom.wrapper.classList.add( 'overview' );
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var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
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for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
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var hslide = horizontalSlides[i],
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htransform = 'translateZ(-2500px) translate(' + ( ( i - indexh ) * 105 ) + '%, 0%)';
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hslide.setAttribute( 'data-index-h', i );
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hslide.style.display = 'block';
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hslide.style.WebkitTransform = htransform;
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hslide.style.MozTransform = htransform;
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hslide.style.msTransform = htransform;
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hslide.style.OTransform = htransform;
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hslide.style.transform = htransform;
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if( !hslide.classList.contains( 'stack' ) ) {
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// Navigate to this slide on click
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hslide.addEventListener( 'click', onOverviewSlideClicked, true );
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}
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|
|
var verticalSlides = hslide.querySelectorAll( 'section' );
|
|
|
|
for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
|
|
var vslide = verticalSlides[j],
|
|
vtransform = 'translate(0%, ' + ( ( j - ( i === indexh ? indexv : 0 ) ) * 105 ) + '%)';
|
|
|
|
vslide.setAttribute( 'data-index-h', i );
|
|
vslide.setAttribute( 'data-index-v', j );
|
|
vslide.style.display = 'block';
|
|
vslide.style.WebkitTransform = vtransform;
|
|
vslide.style.MozTransform = vtransform;
|
|
vslide.style.msTransform = vtransform;
|
|
vslide.style.OTransform = vtransform;
|
|
vslide.style.transform = vtransform;
|
|
|
|
// Navigate to this slide on click
|
|
vslide.addEventListener( 'click', onOverviewSlideClicked, true );
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Exits the slide overview and enters the currently
|
|
* active slide.
|
|
*/
|
|
function deactivateOverview() {
|
|
|
|
// Only proceed if enabled in config
|
|
if( config.overview ) {
|
|
|
|
dom.wrapper.classList.remove( 'overview' );
|
|
|
|
// Select all slides
|
|
var slides = Array.prototype.slice.call( document.querySelectorAll( '.reveal .slides section' ) );
|
|
|
|
for( var i = 0, len = slides.length; i < len; i++ ) {
|
|
var element = slides[i];
|
|
|
|
// Resets all transforms to use the external styles
|
|
element.style.WebkitTransform = '';
|
|
element.style.MozTransform = '';
|
|
element.style.msTransform = '';
|
|
element.style.OTransform = '';
|
|
element.style.transform = '';
|
|
|
|
element.removeEventListener( 'click', onOverviewSlideClicked );
|
|
}
|
|
|
|
slide();
|
|
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Toggles the slide overview mode on and off.
|
|
*
|
|
* @param {Boolean} override Optional flag which overrides the
|
|
* toggle logic and forcibly sets the desired state. True means
|
|
* overview is open, false means it's closed.
|
|
*/
|
|
function toggleOverview( override ) {
|
|
if( typeof override === 'boolean' ) {
|
|
override ? activateOverview() : deactivateOverview();
|
|
}
|
|
else {
|
|
isOverviewActive() ? deactivateOverview() : activateOverview();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Checks if the overview is currently active.
|
|
*
|
|
* @return {Boolean} true if the overview is active,
|
|
* false otherwise
|
|
*/
|
|
function isOverviewActive() {
|
|
return dom.wrapper.classList.contains( 'overview' );
|
|
}
|
|
|
|
/**
|
|
* Handling the fullscreen functionality via the fullscreen API
|
|
*
|
|
* @see http://fullscreen.spec.whatwg.org/
|
|
* @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
|
|
*/
|
|
function enterFullscreen() {
|
|
var element = document.body;
|
|
|
|
// Check which implementation is available
|
|
var requestMethod = element.requestFullScreen ||
|
|
element.webkitRequestFullScreen ||
|
|
element.mozRequestFullScreen ||
|
|
element.msRequestFullScreen;
|
|
|
|
if( requestMethod ) {
|
|
requestMethod.apply( element );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Enters the paused mode which fades everything on screen to
|
|
* black.
|
|
*/
|
|
function pause() {
|
|
dom.wrapper.classList.add( 'paused' );
|
|
}
|
|
|
|
/**
|
|
* Exits from the paused mode.
|
|
*/
|
|
function resume() {
|
|
dom.wrapper.classList.remove( 'paused' );
|
|
}
|
|
|
|
/**
|
|
* Toggles the paused mode on and off.
|
|
*/
|
|
function togglePause() {
|
|
if( isPaused() ) {
|
|
resume();
|
|
}
|
|
else {
|
|
pause();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Checks if we are currently in the paused mode.
|
|
*/
|
|
function isPaused() {
|
|
return dom.wrapper.classList.contains( 'paused' );
|
|
}
|
|
|
|
/**
|
|
* Steps from the current point in the presentation to the
|
|
* slide which matches the specified horizontal and vertical
|
|
* indices.
|
|
*
|
|
* @param {int} h Horizontal index of the target slide
|
|
* @param {int} v Vertical index of the target slide
|
|
*/
|
|
function slide( h, v ) {
|
|
// Remember where we were at before
|
|
previousSlide = currentSlide;
|
|
|
|
// Remember the state before this slide
|
|
var stateBefore = state.concat();
|
|
|
|
// Reset the state array
|
|
state.length = 0;
|
|
|
|
var indexhBefore = indexh,
|
|
indexvBefore = indexv;
|
|
|
|
// 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 );
|
|
|
|
layout();
|
|
|
|
// Apply the new state
|
|
stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
|
|
// Check if this state existed on the previous slide. If it
|
|
// did, we will avoid adding it repeatedly.
|
|
for( var j = 0; j < stateBefore.length; j++ ) {
|
|
if( stateBefore[j] === state[i] ) {
|
|
stateBefore.splice( j, 1 );
|
|
continue stateLoop;
|
|
}
|
|
}
|
|
|
|
document.documentElement.classList.add( state[i] );
|
|
|
|
// Dispatch custom event matching the state's name
|
|
dispatchEvent( state[i] );
|
|
}
|
|
|
|
// Clean up the remaints of the previous state
|
|
while( stateBefore.length ) {
|
|
document.documentElement.classList.remove( stateBefore.pop() );
|
|
}
|
|
|
|
// Update progress if enabled
|
|
if( config.progress && dom.progress ) {
|
|
dom.progressbar.style.width = ( indexh / ( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length - 1 ) ) * window.innerWidth + 'px';
|
|
}
|
|
|
|
// If the overview is active, re-activate it to update positions
|
|
if( isOverviewActive() ) {
|
|
activateOverview();
|
|
}
|
|
|
|
updateControls();
|
|
|
|
// Update the URL hash after a delay since updating it mid-transition
|
|
// is likely to cause visual lag
|
|
clearTimeout( writeURLTimeout );
|
|
writeURLTimeout = setTimeout( writeURL, 1500 );
|
|
|
|
// Query all horizontal slides in the deck
|
|
var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
|
|
|
|
// Find the current horizontal slide and any possible vertical slides
|
|
// within it
|
|
var currentHorizontalSlide = horizontalSlides[ indexh ],
|
|
currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
|
|
|
|
// Store references to the previous and current slides
|
|
currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
|
|
|
|
// Dispatch an event if the slide changed
|
|
if( indexh !== indexhBefore || indexv !== indexvBefore ) {
|
|
dispatchEvent( 'slidechanged', {
|
|
'indexh': indexh,
|
|
'indexv': indexv,
|
|
'previousSlide': previousSlide,
|
|
'currentSlide': currentSlide
|
|
} );
|
|
}
|
|
else {
|
|
// Ensure that the previous slide is never the same as the current
|
|
previousSlide = null;
|
|
}
|
|
|
|
// Solves an edge case where the previous slide maintains the
|
|
// 'present' class when navigating between adjacent vertical
|
|
// stacks
|
|
if( previousSlide ) {
|
|
previousSlide.classList.remove( 'present' );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Updates one dimension of slides by showing the slide
|
|
* with the specified index.
|
|
*
|
|
* @param {String} selector A CSS selector that will fetch
|
|
* the group of slides we are working with
|
|
* @param {Number} index The index of the slide that should be
|
|
* shown
|
|
*
|
|
* @return {Number} The index of the slide that is now shown,
|
|
* might differ from the passed in index if it was out of
|
|
* bounds.
|
|
*/
|
|
function updateSlides( selector, index ) {
|
|
// Select all slides and convert the NodeList result to
|
|
// an array
|
|
var slides = Array.prototype.slice.call( document.querySelectorAll( selector ) ),
|
|
slidesLength = slides.length;
|
|
|
|
if( slidesLength ) {
|
|
|
|
// Should the index loop?
|
|
if( config.loop ) {
|
|
index %= slidesLength;
|
|
|
|
if( index < 0 ) {
|
|
index = slidesLength + index;
|
|
}
|
|
}
|
|
|
|
// Enforce max and minimum index bounds
|
|
index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
|
|
|
|
for( var i = 0; i < slidesLength; i++ ) {
|
|
var element = slides[i];
|
|
|
|
// Optimization; hide all slides that are three or more steps
|
|
// away from the present slide
|
|
if( isOverviewActive() === false ) {
|
|
// The distance loops so that it measures 1 between the first
|
|
// and last slides
|
|
var distance = Math.abs( ( index - i ) % ( slidesLength - 3 ) ) || 0;
|
|
|
|
element.style.display = distance > 3 ? 'none' : 'block';
|
|
}
|
|
|
|
slides[i].classList.remove( 'past' );
|
|
slides[i].classList.remove( 'present' );
|
|
slides[i].classList.remove( 'future' );
|
|
|
|
if( i < index ) {
|
|
// Any element previous to index is given the 'past' class
|
|
slides[i].classList.add( 'past' );
|
|
}
|
|
else if( i > index ) {
|
|
// Any element subsequent to index is given the 'future' class
|
|
slides[i].classList.add( 'future' );
|
|
}
|
|
|
|
// If this element contains vertical slides
|
|
if( element.querySelector( 'section' ) ) {
|
|
slides[i].classList.add( 'stack' );
|
|
}
|
|
}
|
|
|
|
// Mark the current slide as present
|
|
slides[index].classList.add( 'present' );
|
|
|
|
// If this slide has a state associated with it, add it
|
|
// onto the current state of the deck
|
|
var slideState = slides[index].getAttribute( 'data-state' );
|
|
if( slideState ) {
|
|
state = state.concat( slideState.split( ' ' ) );
|
|
}
|
|
|
|
// If this slide has a data-autoslide attribtue associated use this as
|
|
// autoSlide value otherwise use the global configured time
|
|
var slideAutoSlide = slides[index].getAttribute( 'data-autoslide' );
|
|
if( slideAutoSlide ) {
|
|
autoSlide = parseInt( slideAutoSlide );
|
|
} else {
|
|
autoSlide = config.autoSlide
|
|
}
|
|
|
|
}
|
|
else {
|
|
// Since there are no slides we can't be anywhere beyond the
|
|
// zeroth index
|
|
index = 0;
|
|
}
|
|
|
|
return index;
|
|
|
|
}
|
|
|
|
/**
|
|
* Updates the state and link pointers of the controls.
|
|
*/
|
|
function updateControls() {
|
|
if ( config.controls && dom.controls ) {
|
|
|
|
var routes = availableRoutes();
|
|
|
|
// Remove the 'enabled' class from all directions
|
|
dom.controlsLeft.concat( dom.controlsRight )
|
|
.concat( dom.controlsUp )
|
|
.concat( dom.controlsDown )
|
|
.concat( dom.controlsPrev )
|
|
.concat( dom.controlsNext ).forEach( function( node ) {
|
|
node.classList.remove( 'enabled' );
|
|
} );
|
|
|
|
// Add the 'enabled' class to the available routes
|
|
if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
|
|
if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
|
|
if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
|
|
if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
|
|
|
|
// Prev/next buttons
|
|
if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
|
|
if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
|
|
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Determine what available routes there are for navigation.
|
|
*
|
|
* @return {Object} containing four booleans: left/right/up/down
|
|
*/
|
|
function availableRoutes() {
|
|
var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
|
|
verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
|
|
|
|
return {
|
|
left: indexh > 0,
|
|
right: indexh < horizontalSlides.length - 1,
|
|
up: indexv > 0,
|
|
down: indexv < verticalSlides.length - 1
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Reads the current URL (hash) and navigates accordingly.
|
|
*/
|
|
function readURL() {
|
|
var hash = window.location.hash;
|
|
|
|
// Attempt to parse the hash as either an index or name
|
|
var bits = hash.slice( 2 ).split( '/' ),
|
|
name = hash.replace( /#|\//gi, '' );
|
|
|
|
// If the first bit is invalid and there is a name we can
|
|
// assume that this is a named link
|
|
if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
|
|
// Find the slide with the specified name
|
|
var element = document.querySelector( '#' + name );
|
|
|
|
if( element ) {
|
|
// Find the position of the named slide and navigate to it
|
|
var indices = Reveal.getIndices( element );
|
|
slide( indices.h, indices.v );
|
|
}
|
|
// If the slide doesn't exist, navigate to the current slide
|
|
else {
|
|
slide( indexh, indexv );
|
|
}
|
|
}
|
|
else {
|
|
// Read the index components of the hash
|
|
var h = parseInt( bits[0], 10 ) || 0,
|
|
v = parseInt( bits[1], 10 ) || 0;
|
|
|
|
slide( h, v );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Updates the page URL (hash) to reflect the current
|
|
* state.
|
|
*/
|
|
function writeURL() {
|
|
if( config.history ) {
|
|
var url = '/';
|
|
|
|
// If the current slide has an ID, use that as a named link
|
|
if( currentSlide && typeof currentSlide.getAttribute( 'id' ) === 'string' ) {
|
|
url = '/' + currentSlide.getAttribute( 'id' );
|
|
}
|
|
// Otherwise use the /h/v index
|
|
else {
|
|
if( indexh > 0 || indexv > 0 ) url += indexh;
|
|
if( indexv > 0 ) url += '/' + indexv;
|
|
}
|
|
|
|
window.location.hash = url;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Retrieves the h/v location of the current, or specified,
|
|
* slide.
|
|
*
|
|
* @param {HTMLElement} slide If specified, the returned
|
|
* index will be for this slide rather than the currently
|
|
* active one
|
|
*
|
|
* @return {Object} { h: <int>, v: <int> }
|
|
*/
|
|
function getIndices( slide ) {
|
|
// By default, return the current indices
|
|
var h = indexh,
|
|
v = indexv;
|
|
|
|
// If a slide is specified, return the indices of that slide
|
|
if( slide ) {
|
|
var isVertical = !!slide.parentNode.nodeName.match( /section/gi );
|
|
var slideh = isVertical ? slide.parentNode : slide;
|
|
|
|
// Select all horizontal slides
|
|
var horizontalSlides = Array.prototype.slice.call( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
|
|
|
|
// Now that we know which the horizontal slide is, get its index
|
|
h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
|
|
|
|
// If this is a vertical slide, grab the vertical index
|
|
if( isVertical ) {
|
|
v = Math.max( Array.prototype.slice.call( slide.parentNode.children ).indexOf( slide ), 0 );
|
|
}
|
|
}
|
|
|
|
return { h: h, v: v };
|
|
}
|
|
|
|
/**
|
|
* Navigate to the next slide fragment.
|
|
*
|
|
* @return {Boolean} true if there was a next fragment,
|
|
* false otherwise
|
|
*/
|
|
function nextFragment() {
|
|
// Vertical slides:
|
|
if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
|
|
var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
|
|
if( verticalFragments.length ) {
|
|
verticalFragments[0].classList.add( 'visible' );
|
|
|
|
// Notify subscribers of the change
|
|
dispatchEvent( 'fragmentshown', { fragment: verticalFragments[0] } );
|
|
return true;
|
|
}
|
|
}
|
|
// Horizontal slides:
|
|
else {
|
|
var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
|
|
if( horizontalFragments.length ) {
|
|
horizontalFragments[0].classList.add( 'visible' );
|
|
|
|
// Notify subscribers of the change
|
|
dispatchEvent( 'fragmentshown', { fragment: horizontalFragments[0] } );
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Navigate to the previous slide fragment.
|
|
*
|
|
* @return {Boolean} true if there was a previous fragment,
|
|
* false otherwise
|
|
*/
|
|
function previousFragment() {
|
|
// Vertical slides:
|
|
if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
|
|
var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment.visible' );
|
|
if( verticalFragments.length ) {
|
|
verticalFragments[ verticalFragments.length - 1 ].classList.remove( 'visible' );
|
|
|
|
// Notify subscribers of the change
|
|
dispatchEvent( 'fragmenthidden', { fragment: verticalFragments[ verticalFragments.length - 1 ] } );
|
|
return true;
|
|
}
|
|
}
|
|
// Horizontal slides:
|
|
else {
|
|
var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment.visible' );
|
|
if( horizontalFragments.length ) {
|
|
horizontalFragments[ horizontalFragments.length - 1 ].classList.remove( 'visible' );
|
|
|
|
// Notify subscribers of the change
|
|
dispatchEvent( 'fragmenthidden', { fragment: horizontalFragments[ horizontalFragments.length - 1 ] } );
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Cues a new automated slide if enabled in the config.
|
|
*/
|
|
function cueAutoSlide() {
|
|
clearTimeout( autoSlideTimeout );
|
|
|
|
// Cue the next auto-slide if enabled
|
|
if( autoSlide ) {
|
|
autoSlideTimeout = setTimeout( navigateNext, autoSlide );
|
|
}
|
|
}
|
|
|
|
function navigateLeft() {
|
|
// Prioritize hiding fragments
|
|
if( availableRoutes().left && ( isOverviewActive() || previousFragment() === false ) ) {
|
|
slide( indexh - 1, 0 );
|
|
}
|
|
}
|
|
|
|
function navigateRight() {
|
|
// Prioritize revealing fragments
|
|
if( availableRoutes().right && ( isOverviewActive() || nextFragment() === false ) ) {
|
|
slide( indexh + 1, 0 );
|
|
}
|
|
}
|
|
|
|
function navigateUp() {
|
|
// Prioritize hiding fragments
|
|
if( availableRoutes().up && ( isOverviewActive() || previousFragment() === false ) ) {
|
|
slide( indexh, indexv - 1 );
|
|
}
|
|
}
|
|
|
|
function navigateDown() {
|
|
// Prioritize revealing fragments
|
|
if( availableRoutes().down && ( isOverviewActive() || nextFragment() === false ) ) {
|
|
slide( indexh, indexv + 1 );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Navigates backwards, prioritized in the following order:
|
|
* 1) Previous fragment
|
|
* 2) Previous vertical slide
|
|
* 3) Previous horizontal slide
|
|
*/
|
|
function navigatePrev() {
|
|
// Prioritize revealing fragments
|
|
if( previousFragment() === false ) {
|
|
if( availableRoutes().up ) {
|
|
navigateUp();
|
|
}
|
|
else {
|
|
// Fetch the previous horizontal slide, if there is one
|
|
var previousSlide = document.querySelector( '.reveal .slides>section.past:nth-child(' + indexh + ')' );
|
|
|
|
if( previousSlide ) {
|
|
indexv = ( previousSlide.querySelectorAll( 'section' ).length + 1 ) || 0;
|
|
indexh --;
|
|
slide();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Same as #navigatePrev() but navigates forwards.
|
|
*/
|
|
function navigateNext() {
|
|
// Prioritize revealing fragments
|
|
if( nextFragment() === false ) {
|
|
availableRoutes().down ? navigateDown() : navigateRight();
|
|
}
|
|
|
|
// If auto-sliding is enabled we need to cue up
|
|
// another timeout
|
|
cueAutoSlide();
|
|
}
|
|
|
|
|
|
// --------------------------------------------------------------------//
|
|
// ----------------------------- EVENTS -------------------------------//
|
|
// --------------------------------------------------------------------//
|
|
|
|
|
|
/**
|
|
* Handler for the document level 'keydown' event.
|
|
*
|
|
* @param {Object} event
|
|
*/
|
|
function onDocumentKeyDown( event ) {
|
|
// Check if there's a focused element that could be using
|
|
// the keyboard
|
|
var activeElement = document.activeElement;
|
|
var hasFocus = !!( document.activeElement && ( document.activeElement.type || document.activeElement.href || document.activeElement.contentEditable !== 'inherit' ) );
|
|
|
|
// Disregard the event if there's a focused element or a
|
|
// keyboard modifier key is present
|
|
if ( hasFocus || event.shiftKey || event.altKey || event.ctrlKey || event.metaKey ) return;
|
|
|
|
var triggered = true;
|
|
|
|
switch( event.keyCode ) {
|
|
// p, page up
|
|
case 80: case 33: navigatePrev(); break;
|
|
// n, page down
|
|
case 78: case 34: navigateNext(); break;
|
|
// h, left
|
|
case 72: case 37: navigateLeft(); break;
|
|
// l, right
|
|
case 76: case 39: navigateRight(); break;
|
|
// k, up
|
|
case 75: case 38: navigateUp(); break;
|
|
// j, down
|
|
case 74: case 40: navigateDown(); break;
|
|
// home
|
|
case 36: slide( 0 ); break;
|
|
// end
|
|
case 35: slide( Number.MAX_VALUE ); break;
|
|
// space
|
|
case 32: isOverviewActive() ? deactivateOverview() : navigateNext(); break;
|
|
// return
|
|
case 13: isOverviewActive() ? deactivateOverview() : triggered = false; break;
|
|
// b, period
|
|
case 66: case 190: togglePause(); break;
|
|
// f
|
|
case 70: enterFullscreen(); break;
|
|
default:
|
|
triggered = false;
|
|
}
|
|
|
|
// If the input resulted in a triggered action we should prevent
|
|
// the browsers default behavior
|
|
if( triggered ) {
|
|
event.preventDefault();
|
|
}
|
|
else if ( event.keyCode === 27 && supports3DTransforms ) {
|
|
toggleOverview();
|
|
|
|
event.preventDefault();
|
|
}
|
|
|
|
// If auto-sliding is enabled we need to cue up
|
|
// another timeout
|
|
cueAutoSlide();
|
|
|
|
}
|
|
|
|
/**
|
|
* Handler for the document level 'touchstart' event,
|
|
* enables support for swipe and pinch gestures.
|
|
*/
|
|
function onDocumentTouchStart( event ) {
|
|
touch.startX = event.touches[0].clientX;
|
|
touch.startY = event.touches[0].clientY;
|
|
touch.startCount = event.touches.length;
|
|
|
|
// If there's two touches we need to memorize the distance
|
|
// between those two points to detect pinching
|
|
if( event.touches.length === 2 && config.overview ) {
|
|
touch.startSpan = distanceBetween( {
|
|
x: event.touches[1].clientX,
|
|
y: event.touches[1].clientY
|
|
}, {
|
|
x: touch.startX,
|
|
y: touch.startY
|
|
} );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handler for the document level 'touchmove' event.
|
|
*/
|
|
function onDocumentTouchMove( event ) {
|
|
// Each touch should only trigger one action
|
|
if( !touch.handled ) {
|
|
var currentX = event.touches[0].clientX;
|
|
var currentY = event.touches[0].clientY;
|
|
|
|
// If the touch started off with two points and still has
|
|
// two active touches; test for the pinch gesture
|
|
if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
|
|
|
|
// The current distance in pixels between the two touch points
|
|
var currentSpan = distanceBetween( {
|
|
x: event.touches[1].clientX,
|
|
y: event.touches[1].clientY
|
|
}, {
|
|
x: touch.startX,
|
|
y: touch.startY
|
|
} );
|
|
|
|
// If the span is larger than the desire amount we've got
|
|
// ourselves a pinch
|
|
if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
|
|
touch.handled = true;
|
|
|
|
if( currentSpan < touch.startSpan ) {
|
|
activateOverview();
|
|
}
|
|
else {
|
|
deactivateOverview();
|
|
}
|
|
}
|
|
|
|
event.preventDefault();
|
|
|
|
}
|
|
// There was only one touch point, look for a swipe
|
|
else if( event.touches.length === 1 && touch.startCount !== 2 ) {
|
|
|
|
var deltaX = currentX - touch.startX,
|
|
deltaY = currentY - touch.startY;
|
|
|
|
if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
|
|
touch.handled = true;
|
|
navigateLeft();
|
|
}
|
|
else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
|
|
touch.handled = true;
|
|
navigateRight();
|
|
}
|
|
else if( deltaY > touch.threshold ) {
|
|
touch.handled = true;
|
|
navigateUp();
|
|
}
|
|
else if( deltaY < -touch.threshold ) {
|
|
touch.handled = true;
|
|
navigateDown();
|
|
}
|
|
|
|
event.preventDefault();
|
|
|
|
}
|
|
}
|
|
// There's a bug with swiping on some Android devices unless
|
|
// the default action is always prevented
|
|
else if( navigator.userAgent.match( /android/gi ) ) {
|
|
event.preventDefault();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handler for the document level 'touchend' event.
|
|
*/
|
|
function onDocumentTouchEnd( event ) {
|
|
touch.handled = false;
|
|
}
|
|
|
|
/**
|
|
* Handles mouse wheel scrolling, throttled to avoid skipping
|
|
* multiple slides.
|
|
*/
|
|
function onDocumentMouseScroll( event ){
|
|
clearTimeout( mouseWheelTimeout );
|
|
|
|
mouseWheelTimeout = setTimeout( function() {
|
|
var delta = event.detail || -event.wheelDelta;
|
|
if( delta > 0 ) {
|
|
navigateNext();
|
|
}
|
|
else {
|
|
navigatePrev();
|
|
}
|
|
}, 100 );
|
|
}
|
|
|
|
/**
|
|
* Clicking on the progress bar results in a navigation to the
|
|
* closest approximate horizontal slide using this equation:
|
|
*
|
|
* ( clickX / presentationWidth ) * numberOfSlides
|
|
*/
|
|
function onProgressClick( event ) {
|
|
var slidesTotal = Array.prototype.slice.call( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
|
|
var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
|
|
|
|
slide( slideIndex );
|
|
}
|
|
|
|
/**
|
|
* Handler for the window level 'hashchange' event.
|
|
*/
|
|
function onWindowHashChange( event ) {
|
|
readURL();
|
|
}
|
|
|
|
/**
|
|
* Handler for the window level 'resize' event.
|
|
*/
|
|
function onWindowResize( event ) {
|
|
layout();
|
|
}
|
|
|
|
/**
|
|
* Invoked when a slide is and we're in the overview.
|
|
*/
|
|
function onOverviewSlideClicked( event ) {
|
|
// TODO There's a bug here where the event listeners are not
|
|
// removed after deactivating the overview.
|
|
if( isOverviewActive() ) {
|
|
event.preventDefault();
|
|
|
|
deactivateOverview();
|
|
|
|
indexh = this.getAttribute( 'data-index-h' );
|
|
indexv = this.getAttribute( 'data-index-v' );
|
|
|
|
slide();
|
|
}
|
|
}
|
|
|
|
|
|
// --------------------------------------------------------------------//
|
|
// ------------------------------- API --------------------------------//
|
|
// --------------------------------------------------------------------//
|
|
|
|
|
|
return {
|
|
initialize: initialize,
|
|
|
|
// Navigation methods
|
|
slide: slide,
|
|
left: navigateLeft,
|
|
right: navigateRight,
|
|
up: navigateUp,
|
|
down: navigateDown,
|
|
prev: navigatePrev,
|
|
next: navigateNext,
|
|
prevFragment: previousFragment,
|
|
nextFragment: nextFragment,
|
|
|
|
// Deprecated aliases
|
|
navigateTo: slide,
|
|
navigateLeft: navigateLeft,
|
|
navigateRight: navigateRight,
|
|
navigateUp: navigateUp,
|
|
navigateDown: navigateDown,
|
|
navigatePrev: navigatePrev,
|
|
navigateNext: navigateNext,
|
|
|
|
// Toggles the overview mode on/off
|
|
toggleOverview: toggleOverview,
|
|
|
|
// Adds or removes all internal event listeners (such as keyboard)
|
|
addEventListeners: addEventListeners,
|
|
removeEventListeners: removeEventListeners,
|
|
|
|
// Returns the indices of the current, or specified, slide
|
|
getIndices: getIndices,
|
|
|
|
// Returns the previous slide element, may be null
|
|
getPreviousSlide: function() {
|
|
return previousSlide;
|
|
},
|
|
|
|
// Returns the current slide element
|
|
getCurrentSlide: function() {
|
|
return currentSlide;
|
|
},
|
|
|
|
// Helper method, retrieves query string as a key/value hash
|
|
getQueryHash: function() {
|
|
var query = {};
|
|
|
|
location.search.replace( /[A-Z0-9]+?=(\w*)/gi, function(a) {
|
|
query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
|
|
} );
|
|
|
|
return query;
|
|
},
|
|
|
|
// Forward event binding to the reveal DOM element
|
|
addEventListener: function( type, listener, useCapture ) {
|
|
if( 'addEventListener' in window ) {
|
|
( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
|
|
}
|
|
},
|
|
removeEventListener: function( type, listener, useCapture ) {
|
|
if( 'addEventListener' in window ) {
|
|
( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
|
|
}
|
|
}
|
|
};
|
|
|
|
})(); |