4716 lines
128 KiB
JavaScript
4716 lines
128 KiB
JavaScript
/*!
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* reveal.js
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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) 2016 Hakim El Hattab, http://hakim.se
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*/
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(function( root, factory ) {
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if( typeof define === 'function' && define.amd ) {
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// AMD. Register as an anonymous module.
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define( function() {
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root.Reveal = factory();
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return root.Reveal;
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} );
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} else if( typeof exports === 'object' ) {
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// Node. Does not work with strict CommonJS.
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module.exports = factory();
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} else {
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// Browser globals.
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root.Reveal = factory();
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}
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}( this, function() {
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'use strict';
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var Reveal;
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// The reveal.js version
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var VERSION = '3.2.0';
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var SLIDES_SELECTOR = '.slides section',
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HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
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VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
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HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
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// Configuration defaults, can be overridden at initialization time
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config = {
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// The "normal" size of the presentation, aspect ratio will be preserved
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// when the presentation is scaled to fit different resolutions
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width: 960,
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height: 700,
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// Factor of the display size that should remain empty around the content
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margin: 0.1,
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// Bounds for smallest/largest possible scale to apply to content
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minScale: 0.2,
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maxScale: 1.5,
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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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// Display the page number of the current slide
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slideNumber: false,
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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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// Optional function that blocks keyboard events when retuning false
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keyboardCondition: null,
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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: true,
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// Enables touch navigation on devices with touch input
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touch: true,
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// Loop the presentation
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loop: false,
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// Change the presentation direction to be RTL
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rtl: false,
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// Turns fragments on and off globally
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fragments: true,
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// Flags if the presentation is running in an embedded mode,
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// i.e. contained within a limited portion of the screen
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embedded: false,
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// Flags if we should show a help overlay when the questionmark
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// key is pressed
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help: true,
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// Flags if it should be possible to pause the presentation (blackout)
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pause: true,
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// Flags if speaker notes should be visible to all viewers
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showNotes: 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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// Stop auto-sliding after user input
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autoSlideStoppable: true,
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// Use this method for navigation when auto-sliding (defaults to navigateNext)
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autoSlideMethod: null,
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// Enable slide navigation via mouse wheel
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mouseWheel: false,
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// Apply a 3D roll to links on hover
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rollingLinks: false,
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// Hides the address bar on mobile devices
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hideAddressBar: true,
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// Opens links in an iframe preview overlay
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previewLinks: false,
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// Exposes the reveal.js API through window.postMessage
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postMessage: true,
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// Dispatches all reveal.js events to the parent window through postMessage
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postMessageEvents: false,
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// Focuses body when page changes visiblity to ensure keyboard shortcuts work
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focusBodyOnPageVisibilityChange: true,
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// Transition style
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transition: 'slide', // none/fade/slide/convex/concave/zoom
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// Transition speed
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transitionSpeed: 'default', // default/fast/slow
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// Transition style for full page slide backgrounds
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backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
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// Parallax background image
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parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
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// Parallax background size
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parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
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// Amount of pixels to move the parallax background per slide step
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parallaxBackgroundHorizontal: null,
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parallaxBackgroundVertical: null,
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// Number of slides away from the current that are visible
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viewDistance: 3,
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// Script dependencies to load
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dependencies: []
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},
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// Flags if reveal.js is loaded (has dispatched the 'ready' event)
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loaded = false,
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// Flags if the overview mode is currently active
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overview = false,
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// The horizontal and vertical index of the currently active slide
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indexh,
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indexv,
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// The previous and current slide HTML elements
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previousSlide,
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currentSlide,
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previousBackground,
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// Slides may hold a data-state attribute which we pick up and apply
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// as a class to the body. This list contains the combined state of
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// all current slides.
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state = [],
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// The current scale of the presentation (see width/height config)
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scale = 1,
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// 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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// Features supported by the browser, see #checkCapabilities()
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features = {},
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// Client is a mobile device, see #checkCapabilities()
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isMobileDevice,
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// Throttles mouse wheel navigation
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lastMouseWheelStep = 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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// Flags if the interaction event listeners are bound
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eventsAreBound = false,
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// The current auto-slide duration
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autoSlide = 0,
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// Auto slide properties
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autoSlidePlayer,
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autoSlideTimeout = 0,
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autoSlideStartTime = -1,
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autoSlidePaused = false,
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// 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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captured: false,
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threshold: 40
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},
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// Holds information about the keyboard shortcuts
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keyboardShortcuts = {
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'N , SPACE': 'Next slide',
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'P': 'Previous slide',
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'← , H': 'Navigate left',
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'→ , L': 'Navigate right',
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'↑ , K': 'Navigate up',
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'↓ , J': 'Navigate down',
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'Home': 'First slide',
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'End': 'Last slide',
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'B , .': 'Pause',
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'F': 'Fullscreen',
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'ESC, O': 'Slide overview'
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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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checkCapabilities();
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if( !features.transforms2d && !features.transforms3d ) {
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document.body.setAttribute( 'class', 'no-transforms' );
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// Since JS won't be running any further, we load all lazy
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// loading elements upfront
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var images = toArray( document.getElementsByTagName( 'img' ) ),
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iframes = toArray( document.getElementsByTagName( 'iframe' ) );
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var lazyLoadable = images.concat( iframes );
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for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
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var element = lazyLoadable[i];
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if( element.getAttribute( 'data-src' ) ) {
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element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
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element.removeAttribute( 'data-src' );
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}
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}
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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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// Cache references to key DOM elements
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dom.wrapper = document.querySelector( '.reveal' );
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dom.slides = document.querySelector( '.reveal .slides' );
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// Force a layout when the whole page, incl fonts, has loaded
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window.addEventListener( 'load', layout, false );
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var query = Reveal.getQueryHash();
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// Do not accept new dependencies via query config to avoid
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// the potential of malicious script injection
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if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
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// Copy options over to our config object
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extend( config, options );
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extend( config, query );
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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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* Inspect the client to see what it's capable of, this
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* should only happens once per runtime.
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*/
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function checkCapabilities() {
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isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( navigator.userAgent );
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var testElement = document.createElement( 'div' );
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features.transforms3d = 'WebkitPerspective' in testElement.style ||
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'MozPerspective' in testElement.style ||
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'msPerspective' in testElement.style ||
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'OPerspective' in testElement.style ||
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'perspective' in testElement.style;
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features.transforms2d = 'WebkitTransform' in testElement.style ||
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'MozTransform' in testElement.style ||
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'msTransform' in testElement.style ||
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'OTransform' in testElement.style ||
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'transform' in testElement.style;
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features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
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features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
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features.canvas = !!document.createElement( 'canvas' ).getContext;
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// Transitions in the overview are disabled in desktop and
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// Safari due to lag
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features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( navigator.userAgent );
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// Flags if we should use zoom instead of transform to scale
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// up slides. Zoom produces crisper results but has a lot of
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// xbrowser quirks so we only use it in whitelsited browsers.
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features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
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( /chrome/i.test( navigator.userAgent ) || /Version\/[\d\.]+.*Safari/.test( navigator.userAgent ) );
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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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scriptsToPreload = 0;
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// Called once synchronous scripts 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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function loadScript( s ) {
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head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
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// Extension may contain callback functions
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if( typeof s.callback === 'function' ) {
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s.callback.apply( this );
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}
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if( --scriptsToPreload === 0 ) {
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proceed();
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}
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});
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}
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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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loadScript( s );
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}
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}
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if( scripts.length ) {
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scriptsToPreload = scripts.length;
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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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// Listen to messages posted to this window
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setupPostMessage();
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// Prevent iframes from scrolling the slides out of view
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setupIframeScrollPrevention();
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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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readURL();
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// Update all backgrounds
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updateBackground( true );
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// Notify listeners that the presentation is ready but use a 1ms
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// timeout to ensure it's not fired synchronously after #initialize()
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setTimeout( function() {
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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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loaded = true;
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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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// Special setup and config is required when printing to PDF
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if( isPrintingPDF() ) {
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removeEventListeners();
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// The document needs to have loaded for the PDF layout
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// measurements to be accurate
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if( document.readyState === 'complete' ) {
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setupPDF();
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}
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else {
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window.addEventListener( 'load', setupPDF );
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}
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}
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}
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/**
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* Finds and stores references to DOM elements which are
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* required by the presentation. If a required element is
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* not found, it is created.
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*/
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function setupDOM() {
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// Prevent transitions while we're loading
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dom.slides.classList.add( 'no-transition' );
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// Background element
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dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
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// Progress bar
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dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
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dom.progressbar = dom.progress.querySelector( 'span' );
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// Arrow controls
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createSingletonNode( dom.wrapper, 'aside', 'controls',
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'<button class="navigate-left" aria-label="previous slide"></button>' +
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'<button class="navigate-right" aria-label="next slide"></button>' +
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'<button class="navigate-up" aria-label="above slide"></button>' +
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'<button class="navigate-down" aria-label="below slide"></button>' );
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// Slide number
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dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
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// Element containing notes that are visible to the audience
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dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
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dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
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// Overlay graphic which is displayed during the paused mode
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createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
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// Cache references to elements
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dom.controls = document.querySelector( '.reveal .controls' );
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dom.theme = document.querySelector( '#theme' );
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dom.wrapper.setAttribute( 'role', 'application' );
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// There can be multiple instances of controls throughout the page
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dom.controlsLeft = toArray( 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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dom.statusDiv = createStatusDiv();
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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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function createStatusDiv() {
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var statusDiv = document.getElementById( 'aria-status-div' );
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if( !statusDiv ) {
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statusDiv = document.createElement( 'div' );
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statusDiv.style.position = 'absolute';
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statusDiv.style.height = '1px';
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statusDiv.style.width = '1px';
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statusDiv.style.overflow ='hidden';
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statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
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statusDiv.setAttribute( 'id', 'aria-status-div' );
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statusDiv.setAttribute( 'aria-live', 'polite' );
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statusDiv.setAttribute( 'aria-atomic','true' );
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dom.wrapper.appendChild( statusDiv );
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}
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return statusDiv;
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}
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/**
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* Configures the presentation for printing to a static
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* PDF.
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*/
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function setupPDF() {
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var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
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// Dimensions of the PDF pages
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var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
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pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
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// Dimensions of slides within the pages
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var slideWidth = slideSize.width,
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slideHeight = slideSize.height;
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// Let the browser know what page size we want to print
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injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' );
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// Limit the size of certain elements to the dimensions of the slide
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injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
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document.body.classList.add( 'print-pdf' );
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document.body.style.width = pageWidth + 'px';
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document.body.style.height = pageHeight + 'px';
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// Add each slide's index as attributes on itself, we need these
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// indices to generate slide numbers below
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toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
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hslide.setAttribute( 'data-index-h', h );
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if( hslide.classList.contains( 'stack' ) ) {
|
|
toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
|
|
vslide.setAttribute( 'data-index-h', h );
|
|
vslide.setAttribute( 'data-index-v', v );
|
|
} );
|
|
}
|
|
} );
|
|
|
|
// Slide and slide background layout
|
|
toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
|
|
|
|
// Vertical stacks are not centred since their section
|
|
// children will be
|
|
if( slide.classList.contains( 'stack' ) === false ) {
|
|
// Center the slide inside of the page, giving the slide some margin
|
|
var left = ( pageWidth - slideWidth ) / 2,
|
|
top = ( pageHeight - slideHeight ) / 2;
|
|
|
|
var contentHeight = getAbsoluteHeight( slide );
|
|
var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
|
|
|
|
// Center slides vertically
|
|
if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
|
|
top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
|
|
}
|
|
|
|
// Position the slide inside of the page
|
|
slide.style.left = left + 'px';
|
|
slide.style.top = top + 'px';
|
|
slide.style.width = slideWidth + 'px';
|
|
|
|
// TODO Backgrounds need to be multiplied when the slide
|
|
// stretches over multiple pages
|
|
var background = slide.querySelector( '.slide-background' );
|
|
if( background ) {
|
|
background.style.width = pageWidth + 'px';
|
|
background.style.height = ( pageHeight * numberOfPages ) + 'px';
|
|
background.style.top = -top + 'px';
|
|
background.style.left = -left + 'px';
|
|
}
|
|
|
|
// Inject notes if `showNotes` is enabled
|
|
if( config.showNotes ) {
|
|
var notes = getSlideNotes( slide );
|
|
if( notes ) {
|
|
var notesSpacing = 8;
|
|
var notesElement = document.createElement( 'div' );
|
|
notesElement.classList.add( 'speaker-notes' );
|
|
notesElement.classList.add( 'speaker-notes-pdf' );
|
|
notesElement.innerHTML = notes;
|
|
notesElement.style.left = ( notesSpacing - left ) + 'px';
|
|
notesElement.style.bottom = ( notesSpacing - top ) + 'px';
|
|
notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
|
|
slide.appendChild( notesElement );
|
|
}
|
|
}
|
|
|
|
// Inject slide numbers if `slideNumbers` are enabled
|
|
if( config.slideNumber ) {
|
|
var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1,
|
|
slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1;
|
|
|
|
var numberElement = document.createElement( 'div' );
|
|
numberElement.classList.add( 'slide-number' );
|
|
numberElement.classList.add( 'slide-number-pdf' );
|
|
numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV );
|
|
background.appendChild( numberElement );
|
|
}
|
|
}
|
|
|
|
} );
|
|
|
|
// Show all fragments
|
|
toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
|
|
fragment.classList.add( 'visible' );
|
|
} );
|
|
|
|
}
|
|
|
|
/**
|
|
* This is an unfortunate necessity. Iframes can trigger the
|
|
* parent window to scroll, for example by focusing an input.
|
|
* This scrolling can not be prevented by hiding overflow in
|
|
* CSS so we have to resort to repeatedly checking if the
|
|
* browser has decided to offset our slides :(
|
|
*/
|
|
function setupIframeScrollPrevention() {
|
|
|
|
if( dom.slides.querySelector( 'iframe' ) ) {
|
|
setInterval( function() {
|
|
if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
|
|
dom.wrapper.scrollTop = 0;
|
|
dom.wrapper.scrollLeft = 0;
|
|
}
|
|
}, 500 );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Creates an HTML element and returns a reference to it.
|
|
* If the element already exists the existing instance will
|
|
* be returned.
|
|
*/
|
|
function createSingletonNode( container, tagname, classname, innerHTML ) {
|
|
|
|
// Find all nodes matching the description
|
|
var nodes = container.querySelectorAll( '.' + classname );
|
|
|
|
// Check all matches to find one which is a direct child of
|
|
// the specified container
|
|
for( var i = 0; i < nodes.length; i++ ) {
|
|
var testNode = nodes[i];
|
|
if( testNode.parentNode === container ) {
|
|
return testNode;
|
|
}
|
|
}
|
|
|
|
// If no node was found, create it now
|
|
var node = document.createElement( tagname );
|
|
node.classList.add( classname );
|
|
if( typeof innerHTML === 'string' ) {
|
|
node.innerHTML = innerHTML;
|
|
}
|
|
container.appendChild( node );
|
|
|
|
return node;
|
|
|
|
}
|
|
|
|
/**
|
|
* Creates the slide background elements and appends them
|
|
* to the background container. One element is created per
|
|
* slide no matter if the given slide has visible background.
|
|
*/
|
|
function createBackgrounds() {
|
|
|
|
var printMode = isPrintingPDF();
|
|
|
|
// Clear prior backgrounds
|
|
dom.background.innerHTML = '';
|
|
dom.background.classList.add( 'no-transition' );
|
|
|
|
// Iterate over all horizontal slides
|
|
toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
|
|
|
|
var backgroundStack;
|
|
|
|
if( printMode ) {
|
|
backgroundStack = createBackground( slideh, slideh );
|
|
}
|
|
else {
|
|
backgroundStack = createBackground( slideh, dom.background );
|
|
}
|
|
|
|
// Iterate over all vertical slides
|
|
toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
|
|
|
|
if( printMode ) {
|
|
createBackground( slidev, slidev );
|
|
}
|
|
else {
|
|
createBackground( slidev, backgroundStack );
|
|
}
|
|
|
|
backgroundStack.classList.add( 'stack' );
|
|
|
|
} );
|
|
|
|
} );
|
|
|
|
// Add parallax background if specified
|
|
if( config.parallaxBackgroundImage ) {
|
|
|
|
dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
|
|
dom.background.style.backgroundSize = config.parallaxBackgroundSize;
|
|
|
|
// Make sure the below properties are set on the element - these properties are
|
|
// needed for proper transitions to be set on the element via CSS. To remove
|
|
// annoying background slide-in effect when the presentation starts, apply
|
|
// these properties after short time delay
|
|
setTimeout( function() {
|
|
dom.wrapper.classList.add( 'has-parallax-background' );
|
|
}, 1 );
|
|
|
|
}
|
|
else {
|
|
|
|
dom.background.style.backgroundImage = '';
|
|
dom.wrapper.classList.remove( 'has-parallax-background' );
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Creates a background for the given slide.
|
|
*
|
|
* @param {HTMLElement} slide
|
|
* @param {HTMLElement} container The element that the background
|
|
* should be appended to
|
|
*/
|
|
function createBackground( slide, container ) {
|
|
|
|
var data = {
|
|
background: slide.getAttribute( 'data-background' ),
|
|
backgroundSize: slide.getAttribute( 'data-background-size' ),
|
|
backgroundImage: slide.getAttribute( 'data-background-image' ),
|
|
backgroundVideo: slide.getAttribute( 'data-background-video' ),
|
|
backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
|
|
backgroundColor: slide.getAttribute( 'data-background-color' ),
|
|
backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
|
|
backgroundPosition: slide.getAttribute( 'data-background-position' ),
|
|
backgroundTransition: slide.getAttribute( 'data-background-transition' )
|
|
};
|
|
|
|
var element = document.createElement( 'div' );
|
|
|
|
// Carry over custom classes from the slide to the background
|
|
element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
|
|
|
|
if( data.background ) {
|
|
// Auto-wrap image urls in url(...)
|
|
if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
|
|
slide.setAttribute( 'data-background-image', data.background );
|
|
}
|
|
else {
|
|
element.style.background = data.background;
|
|
}
|
|
}
|
|
|
|
// Create a hash for this combination of background settings.
|
|
// This is used to determine when two slide backgrounds are
|
|
// the same.
|
|
if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
|
|
element.setAttribute( 'data-background-hash', data.background +
|
|
data.backgroundSize +
|
|
data.backgroundImage +
|
|
data.backgroundVideo +
|
|
data.backgroundIframe +
|
|
data.backgroundColor +
|
|
data.backgroundRepeat +
|
|
data.backgroundPosition +
|
|
data.backgroundTransition );
|
|
}
|
|
|
|
// Additional and optional background properties
|
|
if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
|
|
if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
|
|
if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
|
|
if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
|
|
if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
|
|
|
|
container.appendChild( element );
|
|
|
|
// If backgrounds are being recreated, clear old classes
|
|
slide.classList.remove( 'has-dark-background' );
|
|
slide.classList.remove( 'has-light-background' );
|
|
|
|
// If this slide has a background color, add a class that
|
|
// signals if it is light or dark. If the slide has no background
|
|
// color, no class will be set
|
|
var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor;
|
|
if( computedBackgroundColor ) {
|
|
var rgb = colorToRgb( computedBackgroundColor );
|
|
|
|
// Ignore fully transparent backgrounds. Some browsers return
|
|
// rgba(0,0,0,0) when reading the computed background color of
|
|
// an element with no background
|
|
if( rgb && rgb.a !== 0 ) {
|
|
if( colorBrightness( computedBackgroundColor ) < 128 ) {
|
|
slide.classList.add( 'has-dark-background' );
|
|
}
|
|
else {
|
|
slide.classList.add( 'has-light-background' );
|
|
}
|
|
}
|
|
}
|
|
|
|
return element;
|
|
|
|
}
|
|
|
|
/**
|
|
* Registers a listener to postMessage events, this makes it
|
|
* possible to call all reveal.js API methods from another
|
|
* window. For example:
|
|
*
|
|
* revealWindow.postMessage( JSON.stringify({
|
|
* method: 'slide',
|
|
* args: [ 2 ]
|
|
* }), '*' );
|
|
*/
|
|
function setupPostMessage() {
|
|
|
|
if( config.postMessage ) {
|
|
window.addEventListener( 'message', function ( event ) {
|
|
var data = event.data;
|
|
|
|
// Make sure we're dealing with JSON
|
|
if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
|
|
data = JSON.parse( data );
|
|
|
|
// Check if the requested method can be found
|
|
if( data.method && typeof Reveal[data.method] === 'function' ) {
|
|
Reveal[data.method].apply( Reveal, data.args );
|
|
}
|
|
}
|
|
}, false );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Applies the configuration settings from the config
|
|
* object. May be called multiple times.
|
|
*/
|
|
function configure( options ) {
|
|
|
|
var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
|
|
|
|
dom.wrapper.classList.remove( config.transition );
|
|
|
|
// New config options may be passed when this method
|
|
// is invoked through the API after initialization
|
|
if( typeof options === 'object' ) extend( config, options );
|
|
|
|
// Force linear transition based on browser capabilities
|
|
if( features.transforms3d === false ) config.transition = 'linear';
|
|
|
|
dom.wrapper.classList.add( config.transition );
|
|
|
|
dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
|
|
dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
|
|
|
|
dom.controls.style.display = config.controls ? 'block' : 'none';
|
|
dom.progress.style.display = config.progress ? 'block' : 'none';
|
|
dom.slideNumber.style.display = config.slideNumber && !isPrintingPDF() ? 'block' : 'none';
|
|
|
|
if( config.rtl ) {
|
|
dom.wrapper.classList.add( 'rtl' );
|
|
}
|
|
else {
|
|
dom.wrapper.classList.remove( 'rtl' );
|
|
}
|
|
|
|
if( config.center ) {
|
|
dom.wrapper.classList.add( 'center' );
|
|
}
|
|
else {
|
|
dom.wrapper.classList.remove( 'center' );
|
|
}
|
|
|
|
// Exit the paused mode if it was configured off
|
|
if( config.pause === false ) {
|
|
resume();
|
|
}
|
|
|
|
if( config.showNotes ) {
|
|
dom.speakerNotes.classList.add( 'visible' );
|
|
}
|
|
else {
|
|
dom.speakerNotes.classList.remove( 'visible' );
|
|
}
|
|
|
|
if( config.mouseWheel ) {
|
|
document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
|
|
document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
|
|
}
|
|
else {
|
|
document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
|
|
document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
|
|
}
|
|
|
|
// Rolling 3D links
|
|
if( config.rollingLinks ) {
|
|
enableRollingLinks();
|
|
}
|
|
else {
|
|
disableRollingLinks();
|
|
}
|
|
|
|
// Iframe link previews
|
|
if( config.previewLinks ) {
|
|
enablePreviewLinks();
|
|
}
|
|
else {
|
|
disablePreviewLinks();
|
|
enablePreviewLinks( '[data-preview-link]' );
|
|
}
|
|
|
|
// Remove existing auto-slide controls
|
|
if( autoSlidePlayer ) {
|
|
autoSlidePlayer.destroy();
|
|
autoSlidePlayer = null;
|
|
}
|
|
|
|
// Generate auto-slide controls if needed
|
|
if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
|
|
autoSlidePlayer = new Playback( dom.wrapper, function() {
|
|
return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
|
|
} );
|
|
|
|
autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
|
|
autoSlidePaused = false;
|
|
}
|
|
|
|
// When fragments are turned off they should be visible
|
|
if( config.fragments === false ) {
|
|
toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
|
|
element.classList.add( 'visible' );
|
|
element.classList.remove( 'current-fragment' );
|
|
} );
|
|
}
|
|
|
|
sync();
|
|
|
|
}
|
|
|
|
/**
|
|
* Binds all event listeners.
|
|
*/
|
|
function addEventListeners() {
|
|
|
|
eventsAreBound = true;
|
|
|
|
window.addEventListener( 'hashchange', onWindowHashChange, false );
|
|
window.addEventListener( 'resize', onWindowResize, false );
|
|
|
|
if( config.touch ) {
|
|
dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
|
|
dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
|
|
dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
|
|
|
|
// Support pointer-style touch interaction as well
|
|
if( window.navigator.pointerEnabled ) {
|
|
// IE 11 uses un-prefixed version of pointer events
|
|
dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
|
|
dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
|
|
dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
|
|
}
|
|
else if( window.navigator.msPointerEnabled ) {
|
|
// IE 10 uses prefixed version of pointer events
|
|
dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
|
|
dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
|
|
dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
|
|
}
|
|
}
|
|
|
|
if( config.keyboard ) {
|
|
document.addEventListener( 'keydown', onDocumentKeyDown, false );
|
|
document.addEventListener( 'keypress', onDocumentKeyPress, false );
|
|
}
|
|
|
|
if( config.progress && dom.progress ) {
|
|
dom.progress.addEventListener( 'click', onProgressClicked, false );
|
|
}
|
|
|
|
if( config.focusBodyOnPageVisibilityChange ) {
|
|
var visibilityChange;
|
|
|
|
if( 'hidden' in document ) {
|
|
visibilityChange = 'visibilitychange';
|
|
}
|
|
else if( 'msHidden' in document ) {
|
|
visibilityChange = 'msvisibilitychange';
|
|
}
|
|
else if( 'webkitHidden' in document ) {
|
|
visibilityChange = 'webkitvisibilitychange';
|
|
}
|
|
|
|
if( visibilityChange ) {
|
|
document.addEventListener( visibilityChange, onPageVisibilityChange, false );
|
|
}
|
|
}
|
|
|
|
// Listen to both touch and click events, in case the device
|
|
// supports both
|
|
var pointerEvents = [ 'touchstart', 'click' ];
|
|
|
|
// Only support touch for Android, fixes double navigations in
|
|
// stock browser
|
|
if( navigator.userAgent.match( /android/gi ) ) {
|
|
pointerEvents = [ 'touchstart' ];
|
|
}
|
|
|
|
pointerEvents.forEach( function( eventName ) {
|
|
dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
|
|
dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
|
|
dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
|
|
dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
|
|
dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
|
|
dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
|
|
} );
|
|
|
|
}
|
|
|
|
/**
|
|
* Unbinds all event listeners.
|
|
*/
|
|
function removeEventListeners() {
|
|
|
|
eventsAreBound = false;
|
|
|
|
document.removeEventListener( 'keydown', onDocumentKeyDown, false );
|
|
document.removeEventListener( 'keypress', onDocumentKeyPress, false );
|
|
window.removeEventListener( 'hashchange', onWindowHashChange, false );
|
|
window.removeEventListener( 'resize', onWindowResize, false );
|
|
|
|
dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
|
|
dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
|
|
dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
|
|
|
|
// IE11
|
|
if( window.navigator.pointerEnabled ) {
|
|
dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
|
|
dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
|
|
dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
|
|
}
|
|
// IE10
|
|
else if( window.navigator.msPointerEnabled ) {
|
|
dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
|
|
dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
|
|
dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
|
|
}
|
|
|
|
if ( config.progress && dom.progress ) {
|
|
dom.progress.removeEventListener( 'click', onProgressClicked, false );
|
|
}
|
|
|
|
[ 'touchstart', 'click' ].forEach( function( eventName ) {
|
|
dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
|
|
dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
|
|
dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
|
|
dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
|
|
dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
|
|
dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
|
|
} );
|
|
|
|
}
|
|
|
|
/**
|
|
* Extend object a with the properties of object b.
|
|
* If there's a conflict, object b takes precedence.
|
|
*/
|
|
function extend( a, b ) {
|
|
|
|
for( var i in b ) {
|
|
a[ i ] = b[ i ];
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Converts the target object to an array.
|
|
*/
|
|
function toArray( o ) {
|
|
|
|
return Array.prototype.slice.call( o );
|
|
|
|
}
|
|
|
|
/**
|
|
* Utility for deserializing a value.
|
|
*/
|
|
function deserialize( value ) {
|
|
|
|
if( typeof value === 'string' ) {
|
|
if( value === 'null' ) return null;
|
|
else if( value === 'true' ) return true;
|
|
else if( value === 'false' ) return false;
|
|
else if( value.match( /^\d+$/ ) ) return parseFloat( value );
|
|
}
|
|
|
|
return value;
|
|
|
|
}
|
|
|
|
/**
|
|
* Measures the distance in pixels between point a
|
|
* and point b.
|
|
*
|
|
* @param {Object} a point with x/y properties
|
|
* @param {Object} b point with x/y properties
|
|
*/
|
|
function distanceBetween( a, b ) {
|
|
|
|
var dx = a.x - b.x,
|
|
dy = a.y - b.y;
|
|
|
|
return Math.sqrt( dx*dx + dy*dy );
|
|
|
|
}
|
|
|
|
/**
|
|
* Applies a CSS transform to the target element.
|
|
*/
|
|
function transformElement( element, transform ) {
|
|
|
|
element.style.WebkitTransform = transform;
|
|
element.style.MozTransform = transform;
|
|
element.style.msTransform = transform;
|
|
element.style.transform = transform;
|
|
|
|
}
|
|
|
|
/**
|
|
* Applies CSS transforms to the slides container. The container
|
|
* is transformed from two separate sources: layout and the overview
|
|
* mode.
|
|
*/
|
|
function transformSlides( transforms ) {
|
|
|
|
// Pick up new transforms from arguments
|
|
if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
|
|
if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
|
|
|
|
// Apply the transforms to the slides container
|
|
if( slidesTransform.layout ) {
|
|
transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
|
|
}
|
|
else {
|
|
transformElement( dom.slides, slidesTransform.overview );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Injects the given CSS styles into the DOM.
|
|
*/
|
|
function injectStyleSheet( value ) {
|
|
|
|
var tag = document.createElement( 'style' );
|
|
tag.type = 'text/css';
|
|
if( tag.styleSheet ) {
|
|
tag.styleSheet.cssText = value;
|
|
}
|
|
else {
|
|
tag.appendChild( document.createTextNode( value ) );
|
|
}
|
|
document.getElementsByTagName( 'head' )[0].appendChild( tag );
|
|
|
|
}
|
|
|
|
/**
|
|
* Converts various color input formats to an {r:0,g:0,b:0} object.
|
|
*
|
|
* @param {String} color The string representation of a color,
|
|
* the following formats are supported:
|
|
* - #000
|
|
* - #000000
|
|
* - rgb(0,0,0)
|
|
*/
|
|
function colorToRgb( color ) {
|
|
|
|
var hex3 = color.match( /^#([0-9a-f]{3})$/i );
|
|
if( hex3 && hex3[1] ) {
|
|
hex3 = hex3[1];
|
|
return {
|
|
r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
|
|
g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
|
|
b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
|
|
};
|
|
}
|
|
|
|
var hex6 = color.match( /^#([0-9a-f]{6})$/i );
|
|
if( hex6 && hex6[1] ) {
|
|
hex6 = hex6[1];
|
|
return {
|
|
r: parseInt( hex6.substr( 0, 2 ), 16 ),
|
|
g: parseInt( hex6.substr( 2, 2 ), 16 ),
|
|
b: parseInt( hex6.substr( 4, 2 ), 16 )
|
|
};
|
|
}
|
|
|
|
var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
|
|
if( rgb ) {
|
|
return {
|
|
r: parseInt( rgb[1], 10 ),
|
|
g: parseInt( rgb[2], 10 ),
|
|
b: parseInt( rgb[3], 10 )
|
|
};
|
|
}
|
|
|
|
var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
|
|
if( rgba ) {
|
|
return {
|
|
r: parseInt( rgba[1], 10 ),
|
|
g: parseInt( rgba[2], 10 ),
|
|
b: parseInt( rgba[3], 10 ),
|
|
a: parseFloat( rgba[4] )
|
|
};
|
|
}
|
|
|
|
return null;
|
|
|
|
}
|
|
|
|
/**
|
|
* Calculates brightness on a scale of 0-255.
|
|
*
|
|
* @param color See colorStringToRgb for supported formats.
|
|
*/
|
|
function colorBrightness( color ) {
|
|
|
|
if( typeof color === 'string' ) color = colorToRgb( color );
|
|
|
|
if( color ) {
|
|
return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
|
|
}
|
|
|
|
return null;
|
|
|
|
}
|
|
|
|
/**
|
|
* Retrieves the height of the given element by looking
|
|
* at the position and height of its immediate children.
|
|
*/
|
|
function getAbsoluteHeight( element ) {
|
|
|
|
var height = 0;
|
|
|
|
if( element ) {
|
|
var absoluteChildren = 0;
|
|
|
|
toArray( element.childNodes ).forEach( function( child ) {
|
|
|
|
if( typeof child.offsetTop === 'number' && child.style ) {
|
|
// Count # of abs children
|
|
if( window.getComputedStyle( child ).position === 'absolute' ) {
|
|
absoluteChildren += 1;
|
|
}
|
|
|
|
height = Math.max( height, child.offsetTop + child.offsetHeight );
|
|
}
|
|
|
|
} );
|
|
|
|
// If there are no absolute children, use offsetHeight
|
|
if( absoluteChildren === 0 ) {
|
|
height = element.offsetHeight;
|
|
}
|
|
|
|
}
|
|
|
|
return height;
|
|
|
|
}
|
|
|
|
/**
|
|
* Returns the remaining height within the parent of the
|
|
* target element.
|
|
*
|
|
* remaining height = [ configured parent height ] - [ current parent height ]
|
|
*/
|
|
function getRemainingHeight( element, height ) {
|
|
|
|
height = height || 0;
|
|
|
|
if( element ) {
|
|
var newHeight, oldHeight = element.style.height;
|
|
|
|
// Change the .stretch element height to 0 in order find the height of all
|
|
// the other elements
|
|
element.style.height = '0px';
|
|
newHeight = height - element.parentNode.offsetHeight;
|
|
|
|
// Restore the old height, just in case
|
|
element.style.height = oldHeight + 'px';
|
|
|
|
return newHeight;
|
|
}
|
|
|
|
return height;
|
|
|
|
}
|
|
|
|
/**
|
|
* Checks if this instance is being used to print a PDF.
|
|
*/
|
|
function isPrintingPDF() {
|
|
|
|
return ( /print-pdf/gi ).test( window.location.search );
|
|
|
|
}
|
|
|
|
/**
|
|
* Hides the address bar if we're on a mobile device.
|
|
*/
|
|
function hideAddressBar() {
|
|
|
|
if( config.hideAddressBar && isMobileDevice ) {
|
|
// Events that should trigger the address bar to hide
|
|
window.addEventListener( 'load', removeAddressBar, false );
|
|
window.addEventListener( 'orientationchange', removeAddressBar, false );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Causes the address bar to hide on mobile devices,
|
|
* more vertical space ftw.
|
|
*/
|
|
function removeAddressBar() {
|
|
|
|
setTimeout( function() {
|
|
window.scrollTo( 0, 1 );
|
|
}, 10 );
|
|
|
|
}
|
|
|
|
/**
|
|
* Dispatches an event of the specified type from the
|
|
* reveal DOM element.
|
|
*/
|
|
function dispatchEvent( type, args ) {
|
|
|
|
var event = document.createEvent( 'HTMLEvents', 1, 2 );
|
|
event.initEvent( type, true, true );
|
|
extend( event, args );
|
|
dom.wrapper.dispatchEvent( event );
|
|
|
|
// If we're in an iframe, post each reveal.js event to the
|
|
// parent window. Used by the notes plugin
|
|
if( config.postMessageEvents && window.parent !== window.self ) {
|
|
window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Wrap all links in 3D goodness.
|
|
*/
|
|
function enableRollingLinks() {
|
|
|
|
if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
|
|
var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
|
|
|
|
for( var i = 0, len = anchors.length; i < len; i++ ) {
|
|
var anchor = anchors[i];
|
|
|
|
if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
|
|
var span = document.createElement('span');
|
|
span.setAttribute('data-title', anchor.text);
|
|
span.innerHTML = anchor.innerHTML;
|
|
|
|
anchor.classList.add( 'roll' );
|
|
anchor.innerHTML = '';
|
|
anchor.appendChild(span);
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Unwrap all 3D links.
|
|
*/
|
|
function disableRollingLinks() {
|
|
|
|
var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
|
|
|
|
for( var i = 0, len = anchors.length; i < len; i++ ) {
|
|
var anchor = anchors[i];
|
|
var span = anchor.querySelector( 'span' );
|
|
|
|
if( span ) {
|
|
anchor.classList.remove( 'roll' );
|
|
anchor.innerHTML = span.innerHTML;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Bind preview frame links.
|
|
*/
|
|
function enablePreviewLinks( selector ) {
|
|
|
|
var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
|
|
|
|
anchors.forEach( function( element ) {
|
|
if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
|
|
element.addEventListener( 'click', onPreviewLinkClicked, false );
|
|
}
|
|
} );
|
|
|
|
}
|
|
|
|
/**
|
|
* Unbind preview frame links.
|
|
*/
|
|
function disablePreviewLinks() {
|
|
|
|
var anchors = toArray( document.querySelectorAll( 'a' ) );
|
|
|
|
anchors.forEach( function( element ) {
|
|
if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
|
|
element.removeEventListener( 'click', onPreviewLinkClicked, false );
|
|
}
|
|
} );
|
|
|
|
}
|
|
|
|
/**
|
|
* Opens a preview window for the target URL.
|
|
*/
|
|
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>',
|
|
'</div>'
|
|
].join('');
|
|
|
|
dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
|
|
dom.overlay.classList.add( 'loaded' );
|
|
}, false );
|
|
|
|
dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
|
|
closeOverlay();
|
|
event.preventDefault();
|
|
}, false );
|
|
|
|
dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
|
|
closeOverlay();
|
|
}, false );
|
|
|
|
setTimeout( function() {
|
|
dom.overlay.classList.add( 'visible' );
|
|
}, 1 );
|
|
|
|
}
|
|
|
|
/**
|
|
* Opens a 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 );
|
|
|
|
var html = '<p class="title">Keyboard Shortcuts</p><br/>';
|
|
|
|
html += '<table><th>KEY</th><th>ACTION</th>';
|
|
for( var key in keyboardShortcuts ) {
|
|
html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</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>'
|
|
].join('');
|
|
|
|
dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
|
|
closeOverlay();
|
|
event.preventDefault();
|
|
}, false );
|
|
|
|
setTimeout( function() {
|
|
dom.overlay.classList.add( 'visible' );
|
|
}, 1 );
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Closes any currently open overlay.
|
|
*/
|
|
function closeOverlay() {
|
|
|
|
if( dom.overlay ) {
|
|
dom.overlay.parentNode.removeChild( dom.overlay );
|
|
dom.overlay = null;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Applies JavaScript-controlled layout rules to the
|
|
* presentation.
|
|
*/
|
|
function layout() {
|
|
|
|
if( dom.wrapper && !isPrintingPDF() ) {
|
|
|
|
var size = getComputedSlideSize();
|
|
|
|
var slidePadding = 20; // TODO Dig this out of DOM
|
|
|
|
// Layout the contents of the slides
|
|
layoutSlideContents( config.width, config.height, slidePadding );
|
|
|
|
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 {
|
|
// Prefer zoom for scaling up so that content remains crisp.
|
|
// Don't use zoom to scale down since that can lead to shifts
|
|
// in text layout/line breaks.
|
|
if( scale > 1 && features.zoom ) {
|
|
dom.slides.style.zoom = scale;
|
|
dom.slides.style.left = '';
|
|
dom.slides.style.top = '';
|
|
dom.slides.style.bottom = '';
|
|
dom.slides.style.right = '';
|
|
transformSlides( { layout: '' } );
|
|
}
|
|
// Apply scale transform as a fallback
|
|
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
|
|
var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
|
|
|
|
for( var i = 0, len = slides.length; i < len; i++ ) {
|
|
var 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 - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
|
|
}
|
|
}
|
|
else {
|
|
slide.style.top = '';
|
|
}
|
|
|
|
}
|
|
|
|
updateProgress();
|
|
updateParallax();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Applies layout logic to the contents of all slides in
|
|
* the presentation.
|
|
*/
|
|
function layoutSlideContents( width, height, padding ) {
|
|
|
|
// Handle sizing of elements with the 'stretch' class
|
|
toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
|
|
|
|
// Determine how much vertical space we can use
|
|
var remainingHeight = getRemainingHeight( element, height );
|
|
|
|
// Consider the aspect ratio of media elements
|
|
if( /(img|video)/gi.test( element.nodeName ) ) {
|
|
var nw = element.naturalWidth || element.videoWidth,
|
|
nh = element.naturalHeight || element.videoHeight;
|
|
|
|
var 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.
|
|
*/
|
|
function getComputedSlideSize( presentationWidth, presentationHeight ) {
|
|
|
|
var 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 {int} v 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
|
|
var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
|
|
|
|
return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/**
|
|
* Displays the overview of slides (quick nav) by scaling
|
|
* down and arranging all slide elements.
|
|
*/
|
|
function activateOverview() {
|
|
|
|
// Only proceed if enabled in config
|
|
if( config.overview && !isOverview() ) {
|
|
|
|
overview = true;
|
|
|
|
dom.wrapper.classList.add( 'overview' );
|
|
dom.wrapper.classList.remove( 'overview-deactivating' );
|
|
|
|
if( features.overviewTransitions ) {
|
|
setTimeout( function() {
|
|
dom.wrapper.classList.add( 'overview-animated' );
|
|
}, 1 );
|
|
}
|
|
|
|
// Don't auto-slide while in overview mode
|
|
cancelAutoSlide();
|
|
|
|
// Move the backgrounds element into the slide container to
|
|
// that the same scaling is applied
|
|
dom.slides.appendChild( dom.background );
|
|
|
|
// Clicking on an overview slide navigates to it
|
|
toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
|
|
if( !slide.classList.contains( 'stack' ) ) {
|
|
slide.addEventListener( 'click', onOverviewSlideClicked, true );
|
|
}
|
|
} );
|
|
|
|
updateSlidesVisibility();
|
|
layoutOverview();
|
|
updateOverview();
|
|
|
|
layout();
|
|
|
|
// Notify observers of the overview showing
|
|
dispatchEvent( 'overviewshown', {
|
|
'indexh': indexh,
|
|
'indexv': indexv,
|
|
'currentSlide': currentSlide
|
|
} );
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Uses CSS transforms to position all slides in a grid for
|
|
* display inside of the overview mode.
|
|
*/
|
|
function layoutOverview() {
|
|
|
|
var margin = 70;
|
|
var slideWidth = config.width + margin,
|
|
slideHeight = config.height + margin;
|
|
|
|
// Reverse in RTL mode
|
|
if( config.rtl ) {
|
|
slideWidth = -slideWidth;
|
|
}
|
|
|
|
// Layout slides
|
|
toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
|
|
hslide.setAttribute( 'data-index-h', h );
|
|
transformElement( hslide, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' );
|
|
|
|
if( hslide.classList.contains( 'stack' ) ) {
|
|
|
|
toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
|
|
vslide.setAttribute( 'data-index-h', h );
|
|
vslide.setAttribute( 'data-index-v', v );
|
|
|
|
transformElement( vslide, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' );
|
|
} );
|
|
|
|
}
|
|
} );
|
|
|
|
// Layout slide backgrounds
|
|
toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
|
|
transformElement( hbackground, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' );
|
|
|
|
toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
|
|
transformElement( vbackground, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' );
|
|
} );
|
|
} );
|
|
|
|
}
|
|
|
|
/**
|
|
* Moves the overview viewport to the current slides.
|
|
* Called each time the current slide changes.
|
|
*/
|
|
function updateOverview() {
|
|
|
|
var margin = 70;
|
|
var slideWidth = config.width + margin,
|
|
slideHeight = config.height + margin;
|
|
|
|
// Reverse in RTL mode
|
|
if( config.rtl ) {
|
|
slideWidth = -slideWidth;
|
|
}
|
|
|
|
transformSlides( {
|
|
overview: [
|
|
'translateX('+ ( -indexh * slideWidth ) +'px)',
|
|
'translateY('+ ( -indexv * slideHeight ) +'px)',
|
|
'translateZ('+ ( window.innerWidth < 400 ? -1000 : -2500 ) +'px)'
|
|
].join( ' ' )
|
|
} );
|
|
|
|
}
|
|
|
|
/**
|
|
* Exits the slide overview and enters the currently
|
|
* active slide.
|
|
*/
|
|
function deactivateOverview() {
|
|
|
|
// Only proceed if enabled in config
|
|
if( config.overview ) {
|
|
|
|
overview = false;
|
|
|
|
dom.wrapper.classList.remove( 'overview' );
|
|
dom.wrapper.classList.remove( 'overview-animated' );
|
|
|
|
// Temporarily add a class so that transitions can do different things
|
|
// depending on whether they are exiting/entering overview, or just
|
|
// moving from slide to slide
|
|
dom.wrapper.classList.add( 'overview-deactivating' );
|
|
|
|
setTimeout( function () {
|
|
dom.wrapper.classList.remove( 'overview-deactivating' );
|
|
}, 1 );
|
|
|
|
// Move the background element back out
|
|
dom.wrapper.appendChild( dom.background );
|
|
|
|
// Clean up changes made to slides
|
|
toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
|
|
transformElement( slide, '' );
|
|
|
|
slide.removeEventListener( 'click', onOverviewSlideClicked, true );
|
|
} );
|
|
|
|
// Clean up changes made to backgrounds
|
|
toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
|
|
transformElement( background, '' );
|
|
} );
|
|
|
|
transformSlides( { overview: '' } );
|
|
|
|
slide( indexh, indexv );
|
|
|
|
layout();
|
|
|
|
cueAutoSlide();
|
|
|
|
// Notify observers of the overview hiding
|
|
dispatchEvent( 'overviewhidden', {
|
|
'indexh': indexh,
|
|
'indexv': indexv,
|
|
'currentSlide': currentSlide
|
|
} );
|
|
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 {
|
|
isOverview() ? deactivateOverview() : activateOverview();
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Checks if the overview is currently active.
|
|
*
|
|
* @return {Boolean} true if the overview is active,
|
|
* false otherwise
|
|
*/
|
|
function isOverview() {
|
|
|
|
return overview;
|
|
|
|
}
|
|
|
|
/**
|
|
* Checks if the current or specified slide is vertical
|
|
* (nested within another slide).
|
|
*
|
|
* @param {HTMLElement} slide [optional] The slide to check
|
|
* orientation of
|
|
*/
|
|
function isVerticalSlide( slide ) {
|
|
|
|
// Prefer slide argument, otherwise use current slide
|
|
slide = slide ? slide : currentSlide;
|
|
|
|
return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
|
|
|
|
}
|
|
|
|
/**
|
|
* 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.webkitRequestFullScreen ||
|
|
element.mozRequestFullScreen ||
|
|
element.msRequestFullscreen;
|
|
|
|
if( requestMethod ) {
|
|
requestMethod.apply( element );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Enters the paused mode which fades everything on screen to
|
|
* black.
|
|
*/
|
|
function pause() {
|
|
|
|
if( config.pause ) {
|
|
var wasPaused = dom.wrapper.classList.contains( 'paused' );
|
|
|
|
cancelAutoSlide();
|
|
dom.wrapper.classList.add( 'paused' );
|
|
|
|
if( wasPaused === false ) {
|
|
dispatchEvent( 'paused' );
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Exits from the paused mode.
|
|
*/
|
|
function resume() {
|
|
|
|
var wasPaused = dom.wrapper.classList.contains( 'paused' );
|
|
dom.wrapper.classList.remove( 'paused' );
|
|
|
|
cueAutoSlide();
|
|
|
|
if( wasPaused ) {
|
|
dispatchEvent( 'resumed' );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Toggles the paused mode on and off.
|
|
*/
|
|
function togglePause( override ) {
|
|
|
|
if( typeof override === 'boolean' ) {
|
|
override ? pause() : resume();
|
|
}
|
|
else {
|
|
isPaused() ? resume() : pause();
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Checks if we are currently in the paused mode.
|
|
*/
|
|
function isPaused() {
|
|
|
|
return dom.wrapper.classList.contains( 'paused' );
|
|
|
|
}
|
|
|
|
/**
|
|
* Toggles the auto slide mode on and off.
|
|
*
|
|
* @param {Boolean} override Optional 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.
|
|
*/
|
|
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 {int} h Horizontal index of the target slide
|
|
* @param {int} v Vertical index of the target slide
|
|
* @param {int} f Optional index of a fragment within the
|
|
* target slide to activate
|
|
* @param {int} o Optional 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
|
|
var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
|
|
|
|
// If no vertical index is specified and the upcoming slide is a
|
|
// stack, resume at its previous vertical index
|
|
if( v === undefined && !isOverview() ) {
|
|
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
|
|
var stateBefore = state.concat();
|
|
|
|
// Reset the state array
|
|
state.length = 0;
|
|
|
|
var indexhBefore = indexh || 0,
|
|
indexvBefore = indexv || 0;
|
|
|
|
// Activate and transition to the new slide
|
|
indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
|
|
indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
|
|
|
|
// Update the visibility of slides now that the indices have changed
|
|
updateSlidesVisibility();
|
|
|
|
layout();
|
|
|
|
// 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 remains of the previous state
|
|
while( stateBefore.length ) {
|
|
document.documentElement.classList.remove( stateBefore.pop() );
|
|
}
|
|
|
|
// Update the overview if it's currently active
|
|
if( isOverview() ) {
|
|
updateOverview();
|
|
}
|
|
|
|
// 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;
|
|
|
|
// Show fragment, if specified
|
|
if( typeof f !== 'undefined' ) {
|
|
navigateFragment( f );
|
|
}
|
|
|
|
// Dispatch an event if the slide changed
|
|
var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
|
|
if( slideChanged ) {
|
|
dispatchEvent( 'slidechanged', {
|
|
'indexh': indexh,
|
|
'indexv': indexv,
|
|
'previousSlide': previousSlide,
|
|
'currentSlide': currentSlide,
|
|
'origin': o
|
|
} );
|
|
}
|
|
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' );
|
|
previousSlide.setAttribute( 'aria-hidden', 'true' );
|
|
|
|
// Reset all slides upon navigate to home
|
|
// Issue: #285
|
|
if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
|
|
// Launch async task
|
|
setTimeout( function () {
|
|
var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
|
|
for( i in slides ) {
|
|
if( slides[i] ) {
|
|
// Reset stack
|
|
setPreviousVerticalIndex( slides[i], 0 );
|
|
}
|
|
}
|
|
}, 0 );
|
|
}
|
|
}
|
|
|
|
// Handle embedded content
|
|
if( slideChanged || !previousSlide ) {
|
|
stopEmbeddedContent( previousSlide );
|
|
startEmbeddedContent( currentSlide );
|
|
}
|
|
|
|
// Announce the current slide contents, for screen readers
|
|
dom.statusDiv.textContent = currentSlide.textContent;
|
|
|
|
updateControls();
|
|
updateProgress();
|
|
updateBackground();
|
|
updateParallax();
|
|
updateSlideNumber();
|
|
updateNotes();
|
|
|
|
// Update the URL hash
|
|
writeURL();
|
|
|
|
cueAutoSlide();
|
|
|
|
}
|
|
|
|
/**
|
|
* Syncs the presentation with the current DOM. Useful
|
|
* when new slides or control elements are added or when
|
|
* the configuration has changed.
|
|
*/
|
|
function sync() {
|
|
|
|
// Subscribe to input
|
|
removeEventListeners();
|
|
addEventListeners();
|
|
|
|
// Force a layout to make sure the current config is accounted for
|
|
layout();
|
|
|
|
// Reflect the current autoSlide value
|
|
autoSlide = config.autoSlide;
|
|
|
|
// Start auto-sliding if it's enabled
|
|
cueAutoSlide();
|
|
|
|
// Re-create the slide backgrounds
|
|
createBackgrounds();
|
|
|
|
// Write the current hash to the URL
|
|
writeURL();
|
|
|
|
sortAllFragments();
|
|
|
|
updateControls();
|
|
updateProgress();
|
|
updateBackground( true );
|
|
updateSlideNumber();
|
|
updateSlidesVisibility();
|
|
updateNotes();
|
|
|
|
formatEmbeddedContent();
|
|
startEmbeddedContent( currentSlide );
|
|
|
|
if( isOverview() ) {
|
|
layoutOverview();
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Resets all vertical slides so that only the first
|
|
* is visible.
|
|
*/
|
|
function resetVerticalSlides() {
|
|
|
|
var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
|
|
horizontalSlides.forEach( function( horizontalSlide ) {
|
|
|
|
var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
|
|
verticalSlides.forEach( function( verticalSlide, y ) {
|
|
|
|
if( y > 0 ) {
|
|
verticalSlide.classList.remove( 'present' );
|
|
verticalSlide.classList.remove( 'past' );
|
|
verticalSlide.classList.add( 'future' );
|
|
verticalSlide.setAttribute( 'aria-hidden', 'true' );
|
|
}
|
|
|
|
} );
|
|
|
|
} );
|
|
|
|
}
|
|
|
|
/**
|
|
* Sorts and formats all of fragments in the
|
|
* presentation.
|
|
*/
|
|
function sortAllFragments() {
|
|
|
|
var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
|
|
horizontalSlides.forEach( function( horizontalSlide ) {
|
|
|
|
var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
|
|
verticalSlides.forEach( function( verticalSlide, y ) {
|
|
|
|
sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
|
|
|
|
} );
|
|
|
|
if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
|
|
|
|
} );
|
|
|
|
}
|
|
|
|
/**
|
|
* 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 = toArray( dom.wrapper.querySelectorAll( selector ) ),
|
|
slidesLength = slides.length;
|
|
|
|
var printMode = isPrintingPDF();
|
|
|
|
if( slidesLength ) {
|
|
|
|
// Should the index loop?
|
|
if( config.loop ) {
|
|
index %= slidesLength;
|
|
|
|
if( index < 0 ) {
|
|
index = slidesLength + index;
|
|
}
|
|
}
|
|
|
|
// Enforce max and minimum index bounds
|
|
index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
|
|
|
|
for( var i = 0; i < slidesLength; i++ ) {
|
|
var element = slides[i];
|
|
|
|
var reverse = config.rtl && !isVerticalSlide( element );
|
|
|
|
element.classList.remove( 'past' );
|
|
element.classList.remove( 'present' );
|
|
element.classList.remove( '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 ) {
|
|
var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
|
|
|
|
// Show all fragments on prior slides
|
|
while( pastFragments.length ) {
|
|
var pastFragment = pastFragments.pop();
|
|
pastFragment.classList.add( 'visible' );
|
|
pastFragment.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 ) {
|
|
var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
|
|
|
|
// No fragments in future slides should be visible ahead of time
|
|
while( futureFragments.length ) {
|
|
var futureFragment = futureFragments.pop();
|
|
futureFragment.classList.remove( 'visible' );
|
|
futureFragment.classList.remove( 'current-fragment' );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Mark the current slide as present
|
|
slides[index].classList.add( 'present' );
|
|
slides[index].removeAttribute( 'hidden' );
|
|
slides[index].removeAttribute( 'aria-hidden' );
|
|
|
|
// If this slide has a state associated with it, add it
|
|
// onto the current state of the deck
|
|
var slideState = slides[index].getAttribute( 'data-state' );
|
|
if( slideState ) {
|
|
state = state.concat( slideState.split( ' ' ) );
|
|
}
|
|
|
|
}
|
|
else {
|
|
// Since there are no slides we can't be anywhere beyond the
|
|
// zeroth index
|
|
index = 0;
|
|
}
|
|
|
|
return index;
|
|
|
|
}
|
|
|
|
/**
|
|
* Optimization method; hide all slides that are far away
|
|
* from the present slide.
|
|
*/
|
|
function updateSlidesVisibility() {
|
|
|
|
// Select all slides and convert the NodeList result to
|
|
// an array
|
|
var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
|
|
horizontalSlidesLength = horizontalSlides.length,
|
|
distanceX,
|
|
distanceY;
|
|
|
|
if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
|
|
|
|
// The number of steps away from the present slide that will
|
|
// be visible
|
|
var viewDistance = isOverview() ? 10 : config.viewDistance;
|
|
|
|
// Limit view distance on weaker devices
|
|
if( isMobileDevice ) {
|
|
viewDistance = isOverview() ? 6 : 2;
|
|
}
|
|
|
|
// All slides need to be visible when exporting to PDF
|
|
if( isPrintingPDF() ) {
|
|
viewDistance = Number.MAX_VALUE;
|
|
}
|
|
|
|
for( var x = 0; x < horizontalSlidesLength; x++ ) {
|
|
var horizontalSlide = horizontalSlides[x];
|
|
|
|
var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
|
|
verticalSlidesLength = verticalSlides.length;
|
|
|
|
// Determine how far away this slide is from the present
|
|
distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
|
|
|
|
// If the presentation is looped, distance should measure
|
|
// 1 between the first and last slides
|
|
if( config.loop ) {
|
|
distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
|
|
}
|
|
|
|
// Show the horizontal slide if it's within the view distance
|
|
if( distanceX < viewDistance ) {
|
|
showSlide( horizontalSlide );
|
|
}
|
|
else {
|
|
hideSlide( horizontalSlide );
|
|
}
|
|
|
|
if( verticalSlidesLength ) {
|
|
|
|
var oy = getPreviousVerticalIndex( horizontalSlide );
|
|
|
|
for( var y = 0; y < verticalSlidesLength; y++ ) {
|
|
var verticalSlide = verticalSlides[y];
|
|
|
|
distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
|
|
|
|
if( distanceX + distanceY < viewDistance ) {
|
|
showSlide( verticalSlide );
|
|
}
|
|
else {
|
|
hideSlide( verticalSlide );
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Pick up notes from the current slide and display tham
|
|
* to the viewer.
|
|
*
|
|
* @see `showNotes` config value
|
|
*/
|
|
function updateNotes() {
|
|
|
|
if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
|
|
|
|
dom.speakerNotes.innerHTML = getSlideNotes() || '';
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Updates the progress bar to reflect the current slide.
|
|
*/
|
|
function updateProgress() {
|
|
|
|
// Update progress if enabled
|
|
if( config.progress && dom.progressbar ) {
|
|
|
|
dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Updates the slide number div to reflect the current slide.
|
|
*
|
|
* The following slide number formats are available:
|
|
* "h.v": horizontal . vertical slide number (default)
|
|
* "h/v": horizontal / vertical slide number
|
|
* "c": flattened slide number
|
|
* "c/t": flattened slide number / total slides
|
|
*/
|
|
function updateSlideNumber() {
|
|
|
|
// Update slide number if enabled
|
|
if( config.slideNumber && dom.slideNumber ) {
|
|
|
|
var value = [];
|
|
var format = 'h.v';
|
|
|
|
// Check if a custom number format is available
|
|
if( typeof config.slideNumber === 'string' ) {
|
|
format = config.slideNumber;
|
|
}
|
|
|
|
switch( format ) {
|
|
case 'c':
|
|
value.push( getSlidePastCount() + 1 );
|
|
break;
|
|
case 'c/t':
|
|
value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
|
|
break;
|
|
case 'h/v':
|
|
value.push( indexh + 1 );
|
|
if( isVerticalSlide() ) value.push( '/', indexv + 1 );
|
|
break;
|
|
default:
|
|
value.push( indexh + 1 );
|
|
if( isVerticalSlide() ) value.push( '.', indexv + 1 );
|
|
}
|
|
|
|
dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Applies HTML formatting to a slide number before it's
|
|
* written to the DOM.
|
|
*/
|
|
function formatSlideNumber( a, delimiter, b ) {
|
|
|
|
if( typeof b === 'number' && !isNaN( b ) ) {
|
|
return '<span class="slide-number-a">'+ a +'</span>' +
|
|
'<span class="slide-number-delimiter">'+ delimiter +'</span>' +
|
|
'<span class="slide-number-b">'+ b +'</span>';
|
|
}
|
|
else {
|
|
return '<span class="slide-number-a">'+ a +'</span>';
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Updates the state of all control/navigation arrows.
|
|
*/
|
|
function updateControls() {
|
|
|
|
var routes = availableRoutes();
|
|
var fragments = availableFragments();
|
|
|
|
// 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' );
|
|
node.classList.remove( 'fragmented' );
|
|
} );
|
|
|
|
// 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' ); } );
|
|
|
|
// Highlight fragment directions
|
|
if( currentSlide ) {
|
|
|
|
// Always apply fragment decorator to prev/next buttons
|
|
if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
|
|
if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
|
|
|
|
// Apply fragment decorators to directional buttons based on
|
|
// what slide axis they are in
|
|
if( isVerticalSlide( currentSlide ) ) {
|
|
if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
|
|
if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
|
|
}
|
|
else {
|
|
if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
|
|
if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Updates the background elements to reflect the current
|
|
* slide.
|
|
*
|
|
* @param {Boolean} includeAll If true, the backgrounds of
|
|
* all vertical slides (not just the present) will be updated.
|
|
*/
|
|
function updateBackground( includeAll ) {
|
|
|
|
var currentBackground = null;
|
|
|
|
// Reverse past/future classes when in RTL mode
|
|
var horizontalPast = config.rtl ? 'future' : 'past',
|
|
horizontalFuture = config.rtl ? 'past' : 'future';
|
|
|
|
// Update the classes of all backgrounds to match the
|
|
// states of their slides (past/present/future)
|
|
toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
|
|
|
|
backgroundh.classList.remove( 'past' );
|
|
backgroundh.classList.remove( 'present' );
|
|
backgroundh.classList.remove( 'future' );
|
|
|
|
if( h < indexh ) {
|
|
backgroundh.classList.add( horizontalPast );
|
|
}
|
|
else if ( h > indexh ) {
|
|
backgroundh.classList.add( horizontalFuture );
|
|
}
|
|
else {
|
|
backgroundh.classList.add( 'present' );
|
|
|
|
// Store a reference to the current background element
|
|
currentBackground = backgroundh;
|
|
}
|
|
|
|
if( includeAll || h === indexh ) {
|
|
toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
|
|
|
|
backgroundv.classList.remove( 'past' );
|
|
backgroundv.classList.remove( 'present' );
|
|
backgroundv.classList.remove( 'future' );
|
|
|
|
if( v < indexv ) {
|
|
backgroundv.classList.add( 'past' );
|
|
}
|
|
else if ( v > indexv ) {
|
|
backgroundv.classList.add( 'future' );
|
|
}
|
|
else {
|
|
backgroundv.classList.add( 'present' );
|
|
|
|
// Only if this is the present horizontal and vertical slide
|
|
if( h === indexh ) currentBackground = backgroundv;
|
|
}
|
|
|
|
} );
|
|
}
|
|
|
|
} );
|
|
|
|
// Stop any currently playing video background
|
|
if( previousBackground ) {
|
|
|
|
var previousVideo = previousBackground.querySelector( 'video' );
|
|
if( previousVideo ) previousVideo.pause();
|
|
|
|
}
|
|
|
|
if( currentBackground ) {
|
|
|
|
// Start video playback
|
|
var currentVideo = currentBackground.querySelector( 'video' );
|
|
if( currentVideo ) {
|
|
|
|
var startVideo = function() {
|
|
currentVideo.currentTime = 0;
|
|
currentVideo.play();
|
|
currentVideo.removeEventListener( 'loadeddata', startVideo );
|
|
};
|
|
|
|
if( currentVideo.readyState > 1 ) {
|
|
startVideo();
|
|
}
|
|
else {
|
|
currentVideo.addEventListener( 'loadeddata', startVideo );
|
|
}
|
|
|
|
}
|
|
|
|
var backgroundImageURL = currentBackground.style.backgroundImage || '';
|
|
|
|
// Restart GIFs (doesn't work in Firefox)
|
|
if( /\.gif/i.test( backgroundImageURL ) ) {
|
|
currentBackground.style.backgroundImage = '';
|
|
window.getComputedStyle( currentBackground ).opacity;
|
|
currentBackground.style.backgroundImage = backgroundImageURL;
|
|
}
|
|
|
|
// Don't transition between identical backgrounds. This
|
|
// prevents unwanted flicker.
|
|
var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
|
|
var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
|
|
if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
|
|
dom.background.classList.add( 'no-transition' );
|
|
}
|
|
|
|
previousBackground = currentBackground;
|
|
|
|
}
|
|
|
|
// If there's a background brightness flag for this slide,
|
|
// bubble it to the .reveal container
|
|
if( currentSlide ) {
|
|
[ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
|
|
if( currentSlide.classList.contains( classToBubble ) ) {
|
|
dom.wrapper.classList.add( classToBubble );
|
|
}
|
|
else {
|
|
dom.wrapper.classList.remove( classToBubble );
|
|
}
|
|
} );
|
|
}
|
|
|
|
// Allow the first background to apply without transition
|
|
setTimeout( function() {
|
|
dom.background.classList.remove( 'no-transition' );
|
|
}, 1 );
|
|
|
|
}
|
|
|
|
/**
|
|
* Updates the position of the parallax background based
|
|
* on the current slide index.
|
|
*/
|
|
function updateParallax() {
|
|
|
|
if( config.parallaxBackgroundImage ) {
|
|
|
|
var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
|
|
verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
|
|
|
|
var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
|
|
backgroundWidth, backgroundHeight;
|
|
|
|
if( backgroundSize.length === 1 ) {
|
|
backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
|
|
}
|
|
else {
|
|
backgroundWidth = parseInt( backgroundSize[0], 10 );
|
|
backgroundHeight = parseInt( backgroundSize[1], 10 );
|
|
}
|
|
|
|
var slideWidth = dom.background.offsetWidth,
|
|
horizontalSlideCount = horizontalSlides.length,
|
|
horizontalOffsetMultiplier,
|
|
horizontalOffset;
|
|
|
|
if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
|
|
horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
|
|
}
|
|
else {
|
|
horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
|
|
}
|
|
|
|
horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
|
|
|
|
var slideHeight = dom.background.offsetHeight,
|
|
verticalSlideCount = verticalSlides.length,
|
|
verticalOffsetMultiplier,
|
|
verticalOffset;
|
|
|
|
if( typeof config.parallaxBackgroundVertical === 'number' ) {
|
|
verticalOffsetMultiplier = config.parallaxBackgroundVertical;
|
|
}
|
|
else {
|
|
verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
|
|
}
|
|
|
|
verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv * 1 : 0;
|
|
|
|
dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Called when the given slide is within the configured view
|
|
* distance. Shows the slide element and loads any content
|
|
* that is set to load lazily (data-src).
|
|
*/
|
|
function showSlide( slide ) {
|
|
|
|
// Show the slide element
|
|
slide.style.display = 'block';
|
|
|
|
// Media elements with data-src attributes
|
|
toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) {
|
|
element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
|
|
element.removeAttribute( 'data-src' );
|
|
} );
|
|
|
|
// Media elements with <source> children
|
|
toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
|
|
var sources = 0;
|
|
|
|
toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
|
|
source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
|
|
source.removeAttribute( 'data-src' );
|
|
sources += 1;
|
|
} );
|
|
|
|
// If we rewrote sources for this video/audio element, we need
|
|
// to manually tell it to load from its new origin
|
|
if( sources > 0 ) {
|
|
media.load();
|
|
}
|
|
} );
|
|
|
|
|
|
// Show the corresponding background element
|
|
var indices = getIndices( slide );
|
|
var background = getSlideBackground( indices.h, indices.v );
|
|
if( background ) {
|
|
background.style.display = 'block';
|
|
|
|
// If the background contains media, load it
|
|
if( background.hasAttribute( 'data-loaded' ) === false ) {
|
|
background.setAttribute( 'data-loaded', 'true' );
|
|
|
|
var backgroundImage = slide.getAttribute( 'data-background-image' ),
|
|
backgroundVideo = slide.getAttribute( 'data-background-video' ),
|
|
backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
|
|
backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ),
|
|
backgroundIframe = slide.getAttribute( 'data-background-iframe' );
|
|
|
|
// Images
|
|
if( backgroundImage ) {
|
|
background.style.backgroundImage = 'url('+ backgroundImage +')';
|
|
}
|
|
// Videos
|
|
else if ( backgroundVideo && !isSpeakerNotes() ) {
|
|
var video = document.createElement( 'video' );
|
|
|
|
if( backgroundVideoLoop ) {
|
|
video.setAttribute( 'loop', '' );
|
|
}
|
|
|
|
if( backgroundVideoMuted ) {
|
|
video.muted = true;
|
|
}
|
|
|
|
// Support comma separated lists of video sources
|
|
backgroundVideo.split( ',' ).forEach( function( source ) {
|
|
video.innerHTML += '<source src="'+ source +'">';
|
|
} );
|
|
|
|
background.appendChild( video );
|
|
}
|
|
// Iframes
|
|
else if( backgroundIframe ) {
|
|
var iframe = document.createElement( 'iframe' );
|
|
iframe.setAttribute( 'src', backgroundIframe );
|
|
iframe.style.width = '100%';
|
|
iframe.style.height = '100%';
|
|
iframe.style.maxHeight = '100%';
|
|
iframe.style.maxWidth = '100%';
|
|
|
|
background.appendChild( iframe );
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Called when the given slide is moved outside of the
|
|
* configured view distance.
|
|
*/
|
|
function hideSlide( slide ) {
|
|
|
|
// Hide the slide element
|
|
slide.style.display = 'none';
|
|
|
|
// Hide the corresponding background element
|
|
var indices = getIndices( slide );
|
|
var background = getSlideBackground( indices.h, indices.v );
|
|
if( background ) {
|
|
background.style.display = 'none';
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Determine what available routes there are for navigation.
|
|
*
|
|
* @return {Object} containing four booleans: left/right/up/down
|
|
*/
|
|
function availableRoutes() {
|
|
|
|
var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
|
|
verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
|
|
|
|
var routes = {
|
|
left: indexh > 0 || config.loop,
|
|
right: indexh < horizontalSlides.length - 1 || config.loop,
|
|
up: indexv > 0,
|
|
down: indexv < verticalSlides.length - 1
|
|
};
|
|
|
|
// reverse horizontal controls for rtl
|
|
if( config.rtl ) {
|
|
var left = routes.left;
|
|
routes.left = routes.right;
|
|
routes.right = left;
|
|
}
|
|
|
|
return routes;
|
|
|
|
}
|
|
|
|
/**
|
|
* Returns an object describing the available fragment
|
|
* directions.
|
|
*
|
|
* @return {Object} two boolean properties: prev/next
|
|
*/
|
|
function availableFragments() {
|
|
|
|
if( currentSlide && config.fragments ) {
|
|
var fragments = currentSlide.querySelectorAll( '.fragment' );
|
|
var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
|
|
|
|
return {
|
|
prev: fragments.length - hiddenFragments.length > 0,
|
|
next: !!hiddenFragments.length
|
|
};
|
|
}
|
|
else {
|
|
return { prev: false, next: false };
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Enforces origin-specific format rules for embedded media.
|
|
*/
|
|
function formatEmbeddedContent() {
|
|
|
|
var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
|
|
toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
|
|
var src = el.getAttribute( sourceAttribute );
|
|
if( src && src.indexOf( param ) === -1 ) {
|
|
el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
|
|
}
|
|
});
|
|
};
|
|
|
|
// YouTube frames must include "?enablejsapi=1"
|
|
_appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
|
|
_appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
|
|
|
|
// Vimeo frames must include "?api=1"
|
|
_appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
|
|
_appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
|
|
|
|
}
|
|
|
|
/**
|
|
* Start playback of any embedded content inside of
|
|
* the targeted slide.
|
|
*/
|
|
function startEmbeddedContent( slide ) {
|
|
|
|
if( slide && !isSpeakerNotes() ) {
|
|
// Restart GIFs
|
|
toArray( slide.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
|
|
// Setting the same unchanged source like this was confirmed
|
|
// to work in Chrome, FF & Safari
|
|
el.setAttribute( 'src', el.getAttribute( 'src' ) );
|
|
} );
|
|
|
|
// HTML5 media elements
|
|
toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
|
|
if( el.hasAttribute( 'data-autoplay' ) && typeof el.play === 'function' ) {
|
|
el.play();
|
|
}
|
|
} );
|
|
|
|
// Normal iframes
|
|
toArray( slide.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
|
|
startEmbeddedIframe( { target: el } );
|
|
} );
|
|
|
|
// Lazy loading iframes
|
|
toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
|
|
if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
|
|
el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
|
|
el.addEventListener( 'load', startEmbeddedIframe );
|
|
el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
|
|
}
|
|
} );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* "Starts" the content of an embedded iframe using the
|
|
* postmessage API.
|
|
*/
|
|
function startEmbeddedIframe( event ) {
|
|
|
|
var iframe = event.target;
|
|
|
|
// YouTube postMessage API
|
|
if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
|
|
iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
|
|
}
|
|
// Vimeo postMessage API
|
|
else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
|
|
iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
|
|
}
|
|
// Generic postMessage API
|
|
else {
|
|
iframe.contentWindow.postMessage( 'slide:start', '*' );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Stop playback of any embedded content inside of
|
|
* the targeted slide.
|
|
*/
|
|
function stopEmbeddedContent( slide ) {
|
|
|
|
if( slide && slide.parentNode ) {
|
|
// HTML5 media elements
|
|
toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
|
|
if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
|
|
el.pause();
|
|
}
|
|
} );
|
|
|
|
// Generic postMessage API for non-lazy loaded iframes
|
|
toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
|
|
el.contentWindow.postMessage( 'slide:stop', '*' );
|
|
el.removeEventListener( 'load', startEmbeddedIframe );
|
|
});
|
|
|
|
// YouTube postMessage API
|
|
toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
|
|
if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
|
|
el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
|
|
}
|
|
});
|
|
|
|
// Vimeo postMessage API
|
|
toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
|
|
if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
|
|
el.contentWindow.postMessage( '{"method":"pause"}', '*' );
|
|
}
|
|
});
|
|
|
|
// Lazy loading iframes
|
|
toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
|
|
// Only removing the src doesn't actually unload the frame
|
|
// in all browsers (Firefox) so we set it to blank first
|
|
el.setAttribute( 'src', 'about:blank' );
|
|
el.removeAttribute( 'src' );
|
|
} );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Returns the number of past slides. This can be used as a global
|
|
* flattened index for slides.
|
|
*/
|
|
function getSlidePastCount() {
|
|
|
|
var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
|
|
|
|
// The number of past slides
|
|
var pastCount = 0;
|
|
|
|
// Step through all slides and count the past ones
|
|
mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
|
|
|
|
var horizontalSlide = horizontalSlides[i];
|
|
var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
|
|
|
|
for( var j = 0; j < verticalSlides.length; j++ ) {
|
|
|
|
// Stop as soon as we arrive at the present
|
|
if( verticalSlides[j].classList.contains( 'present' ) ) {
|
|
break mainLoop;
|
|
}
|
|
|
|
pastCount++;
|
|
|
|
}
|
|
|
|
// Stop as soon as we arrive at the present
|
|
if( horizontalSlide.classList.contains( 'present' ) ) {
|
|
break;
|
|
}
|
|
|
|
// Don't count the wrapping section for vertical slides
|
|
if( horizontalSlide.classList.contains( 'stack' ) === false ) {
|
|
pastCount++;
|
|
}
|
|
|
|
}
|
|
|
|
return pastCount;
|
|
|
|
}
|
|
|
|
/**
|
|
* Returns a value ranging from 0-1 that represents
|
|
* how far into the presentation we have navigated.
|
|
*/
|
|
function getProgress() {
|
|
|
|
// The number of past and total slides
|
|
var totalCount = getTotalSlides();
|
|
var pastCount = getSlidePastCount();
|
|
|
|
if( currentSlide ) {
|
|
|
|
var allFragments = currentSlide.querySelectorAll( '.fragment' );
|
|
|
|
// If there are fragments in the current slide those should be
|
|
// accounted for in the progress.
|
|
if( allFragments.length > 0 ) {
|
|
var 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)
|
|
var fragmentWeight = 0.9;
|
|
|
|
// Add fragment progress to the past slide count
|
|
pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
|
|
}
|
|
|
|
}
|
|
|
|
return pastCount / ( totalCount - 1 );
|
|
|
|
}
|
|
|
|
/**
|
|
* Checks if this presentation is running inside of the
|
|
* speaker notes window.
|
|
*/
|
|
function isSpeakerNotes() {
|
|
|
|
return !!window.location.search.match( /receiver/gi );
|
|
|
|
}
|
|
|
|
/**
|
|
* 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 ) {
|
|
var element;
|
|
|
|
// Ensure the named link is a valid HTML ID attribute
|
|
if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) {
|
|
// Find the slide with the specified ID
|
|
element = document.getElementById( 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 || 0, indexv || 0 );
|
|
}
|
|
}
|
|
else {
|
|
// Read the index components of the hash
|
|
var h = parseInt( bits[0], 10 ) || 0,
|
|
v = parseInt( bits[1], 10 ) || 0;
|
|
|
|
if( h !== indexh || v !== indexv ) {
|
|
slide( h, v );
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Updates the page URL (hash) to reflect the current
|
|
* state.
|
|
*
|
|
* @param {Number} delay The time in ms to wait before
|
|
* writing the hash
|
|
*/
|
|
function writeURL( delay ) {
|
|
|
|
if( config.history ) {
|
|
|
|
// Make sure there's never more than one timeout running
|
|
clearTimeout( writeURLTimeout );
|
|
|
|
// If a delay is specified, timeout this call
|
|
if( typeof delay === 'number' ) {
|
|
writeURLTimeout = setTimeout( writeURL, delay );
|
|
}
|
|
else if( currentSlide ) {
|
|
var url = '/';
|
|
|
|
// Attempt to create a named link based on the slide's ID
|
|
var id = currentSlide.getAttribute( 'id' );
|
|
if( id ) {
|
|
id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
|
|
}
|
|
|
|
// If the current slide has an ID, use that as a named link
|
|
if( typeof id === 'string' && id.length ) {
|
|
url = '/' + 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>, f: <int> }
|
|
*/
|
|
function getIndices( slide ) {
|
|
|
|
// By default, return the current indices
|
|
var h = indexh,
|
|
v = indexv,
|
|
f;
|
|
|
|
// If a slide is specified, return the indices of that slide
|
|
if( slide ) {
|
|
var isVertical = isVerticalSlide( slide );
|
|
var slideh = isVertical ? slide.parentNode : slide;
|
|
|
|
// Select all horizontal slides
|
|
var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
|
|
|
|
// Now that we know which the horizontal slide is, get its index
|
|
h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
|
|
|
|
// Assume we're not vertical
|
|
v = undefined;
|
|
|
|
// If this is a vertical slide, grab the vertical index
|
|
if( isVertical ) {
|
|
v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
|
|
}
|
|
}
|
|
|
|
if( !slide && currentSlide ) {
|
|
var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
|
|
if( hasFragments ) {
|
|
var 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: h, v: v, f: f };
|
|
|
|
}
|
|
|
|
/**
|
|
* Retrieves the total number of slides in this presentation.
|
|
*/
|
|
function getTotalSlides() {
|
|
|
|
return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
|
|
|
|
}
|
|
|
|
/**
|
|
* Returns the slide element matching the specified index.
|
|
*/
|
|
function getSlide( x, y ) {
|
|
|
|
var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
|
|
var 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.
|
|
*/
|
|
function getSlideBackground( x, y ) {
|
|
|
|
// When printing to PDF the slide backgrounds are nested
|
|
// inside of the slides
|
|
if( isPrintingPDF() ) {
|
|
var slide = getSlide( x, y );
|
|
if( slide ) {
|
|
var background = slide.querySelector( '.slide-background' );
|
|
if( background && background.parentNode === slide ) {
|
|
return background;
|
|
}
|
|
}
|
|
|
|
return undefined;
|
|
}
|
|
|
|
var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
|
|
var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
|
|
|
|
if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
|
|
return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
|
|
}
|
|
|
|
return horizontalBackground;
|
|
|
|
}
|
|
|
|
/**
|
|
* Retrieves the speaker notes from a slide. Notes can be
|
|
* defined in two ways:
|
|
* 1. As a data-notes attribute on the slide <section>
|
|
* 2. As an <aside class="notes"> inside of the slide
|
|
*/
|
|
function getSlideNotes( slide ) {
|
|
|
|
// Default to the current slide
|
|
slide = slide || currentSlide;
|
|
|
|
// Notes can be specified via the data-notes attribute...
|
|
if( slide.hasAttribute( 'data-notes' ) ) {
|
|
return slide.getAttribute( 'data-notes' );
|
|
}
|
|
|
|
// ... or using an <aside class="notes"> element
|
|
var notesElement = slide.querySelector( 'aside.notes' );
|
|
if( notesElement ) {
|
|
return notesElement.innerHTML;
|
|
}
|
|
|
|
return null;
|
|
|
|
}
|
|
|
|
/**
|
|
* Retrieves the current state of the presentation as
|
|
* an object. This state can then be restored at any
|
|
* time.
|
|
*/
|
|
function getState() {
|
|
|
|
var indices = getIndices();
|
|
|
|
return {
|
|
indexh: indices.h,
|
|
indexv: indices.v,
|
|
indexf: indices.f,
|
|
paused: isPaused(),
|
|
overview: isOverview()
|
|
};
|
|
|
|
}
|
|
|
|
/**
|
|
* Restores the presentation to the given state.
|
|
*
|
|
* @param {Object} state As generated by getState()
|
|
*/
|
|
function setState( state ) {
|
|
|
|
if( typeof state === 'object' ) {
|
|
slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
|
|
|
|
var pausedFlag = deserialize( state.paused ),
|
|
overviewFlag = deserialize( state.overview );
|
|
|
|
if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
|
|
togglePause( pausedFlag );
|
|
}
|
|
|
|
if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
|
|
toggleOverview( overviewFlag );
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Return a sorted fragments list, ordered by an increasing
|
|
* "data-fragment-index" attribute.
|
|
*
|
|
* Fragments will be revealed in the order that they are returned by
|
|
* this function, so you can use the index attributes to control the
|
|
* order of fragment appearance.
|
|
*
|
|
* To maintain a sensible default fragment order, fragments are presumed
|
|
* to be passed in document order. This function adds a "fragment-index"
|
|
* attribute to each node if such an attribute is not already present,
|
|
* and sets that attribute to an integer value which is the position of
|
|
* the fragment within the fragments list.
|
|
*/
|
|
function sortFragments( fragments ) {
|
|
|
|
fragments = toArray( fragments );
|
|
|
|
var ordered = [],
|
|
unordered = [],
|
|
sorted = [];
|
|
|
|
// Group ordered and unordered elements
|
|
fragments.forEach( function( fragment, i ) {
|
|
if( fragment.hasAttribute( 'data-fragment-index' ) ) {
|
|
var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
|
|
|
|
if( !ordered[index] ) {
|
|
ordered[index] = [];
|
|
}
|
|
|
|
ordered[index].push( fragment );
|
|
}
|
|
else {
|
|
unordered.push( [ fragment ] );
|
|
}
|
|
} );
|
|
|
|
// Append fragments without explicit indices in their
|
|
// DOM order
|
|
ordered = ordered.concat( unordered );
|
|
|
|
// Manually count the index up per group to ensure there
|
|
// are no gaps
|
|
var index = 0;
|
|
|
|
// Push all fragments in their sorted order to an array,
|
|
// this flattens the groups
|
|
ordered.forEach( function( group ) {
|
|
group.forEach( function( fragment ) {
|
|
sorted.push( fragment );
|
|
fragment.setAttribute( 'data-fragment-index', index );
|
|
} );
|
|
|
|
index ++;
|
|
} );
|
|
|
|
return sorted;
|
|
|
|
}
|
|
|
|
/**
|
|
* Navigate to the specified slide fragment.
|
|
*
|
|
* @param {Number} index The index of the fragment that
|
|
* should be shown, -1 means all are invisible
|
|
* @param {Number} offset Integer offset to apply to the
|
|
* fragment index
|
|
*
|
|
* @return {Boolean} true if a change was made in any
|
|
* fragments visibility as part of this call
|
|
*/
|
|
function navigateFragment( index, offset ) {
|
|
|
|
if( currentSlide && config.fragments ) {
|
|
|
|
var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
|
|
if( fragments.length ) {
|
|
|
|
// If no index is specified, find the current
|
|
if( typeof index !== 'number' ) {
|
|
var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
|
|
|
|
if( lastVisibleFragment ) {
|
|
index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
|
|
}
|
|
else {
|
|
index = -1;
|
|
}
|
|
}
|
|
|
|
// If an offset is specified, apply it to the index
|
|
if( typeof offset === 'number' ) {
|
|
index += offset;
|
|
}
|
|
|
|
var fragmentsShown = [],
|
|
fragmentsHidden = [];
|
|
|
|
toArray( fragments ).forEach( function( element, i ) {
|
|
|
|
if( element.hasAttribute( 'data-fragment-index' ) ) {
|
|
i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
|
|
}
|
|
|
|
// Visible fragments
|
|
if( i <= index ) {
|
|
if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
|
|
element.classList.add( 'visible' );
|
|
element.classList.remove( 'current-fragment' );
|
|
|
|
// Announce the fragments one by one to the Screen Reader
|
|
dom.statusDiv.textContent = element.textContent;
|
|
|
|
if( i === index ) {
|
|
element.classList.add( 'current-fragment' );
|
|
}
|
|
}
|
|
// Hidden fragments
|
|
else {
|
|
if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
|
|
element.classList.remove( 'visible' );
|
|
element.classList.remove( 'current-fragment' );
|
|
}
|
|
|
|
|
|
} );
|
|
|
|
if( fragmentsHidden.length ) {
|
|
dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
|
|
}
|
|
|
|
if( fragmentsShown.length ) {
|
|
dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
|
|
}
|
|
|
|
updateControls();
|
|
updateProgress();
|
|
|
|
return !!( fragmentsShown.length || fragmentsHidden.length );
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
/**
|
|
* Navigate to the next slide fragment.
|
|
*
|
|
* @return {Boolean} true if there was a next fragment,
|
|
* false otherwise
|
|
*/
|
|
function nextFragment() {
|
|
|
|
return navigateFragment( null, 1 );
|
|
|
|
}
|
|
|
|
/**
|
|
* Navigate to the previous slide fragment.
|
|
*
|
|
* @return {Boolean} true if there was a previous fragment,
|
|
* false otherwise
|
|
*/
|
|
function previousFragment() {
|
|
|
|
return navigateFragment( null, -1 );
|
|
|
|
}
|
|
|
|
/**
|
|
* Cues a new automated slide if enabled in the config.
|
|
*/
|
|
function cueAutoSlide() {
|
|
|
|
cancelAutoSlide();
|
|
|
|
if( currentSlide ) {
|
|
|
|
var currentFragment = currentSlide.querySelector( '.current-fragment' );
|
|
|
|
var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null;
|
|
var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
|
|
var 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.
|
|
if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
|
|
toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
|
|
if( el.hasAttribute( 'data-autoplay' ) ) {
|
|
if( autoSlide && el.duration * 1000 > autoSlide ) {
|
|
autoSlide = ( el.duration * 1000 ) + 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() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
|
|
autoSlideTimeout = setTimeout( function() {
|
|
typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : 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( 'autoslidepaused' );
|
|
clearTimeout( autoSlideTimeout );
|
|
|
|
if( autoSlidePlayer ) {
|
|
autoSlidePlayer.setPlaying( false );
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
function resumeAutoSlide() {
|
|
|
|
if( autoSlide && autoSlidePaused ) {
|
|
autoSlidePaused = false;
|
|
dispatchEvent( 'autoslideresumed' );
|
|
cueAutoSlide();
|
|
}
|
|
|
|
}
|
|
|
|
function navigateLeft() {
|
|
|
|
// Reverse for RTL
|
|
if( config.rtl ) {
|
|
if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
|
|
slide( indexh + 1 );
|
|
}
|
|
}
|
|
// Normal navigation
|
|
else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
|
|
slide( indexh - 1 );
|
|
}
|
|
|
|
}
|
|
|
|
function navigateRight() {
|
|
|
|
// Reverse for RTL
|
|
if( config.rtl ) {
|
|
if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
|
|
slide( indexh - 1 );
|
|
}
|
|
}
|
|
// Normal navigation
|
|
else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
|
|
slide( indexh + 1 );
|
|
}
|
|
|
|
}
|
|
|
|
function navigateUp() {
|
|
|
|
// Prioritize hiding fragments
|
|
if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
|
|
slide( indexh, indexv - 1 );
|
|
}
|
|
|
|
}
|
|
|
|
function navigateDown() {
|
|
|
|
// Prioritize revealing fragments
|
|
if( ( isOverview() || nextFragment() === 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( previousFragment() === false ) {
|
|
if( availableRoutes().up ) {
|
|
navigateUp();
|
|
}
|
|
else {
|
|
// Fetch the previous horizontal slide, if there is one
|
|
var previousSlide;
|
|
|
|
if( config.rtl ) {
|
|
previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
|
|
}
|
|
else {
|
|
previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
|
|
}
|
|
|
|
if( previousSlide ) {
|
|
var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
|
|
var h = indexh - 1;
|
|
slide( h, v );
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* The reverse of #navigatePrev().
|
|
*/
|
|
function navigateNext() {
|
|
|
|
// Prioritize revealing fragments
|
|
if( nextFragment() === false ) {
|
|
if( availableRoutes().down ) {
|
|
navigateDown();
|
|
}
|
|
else if( config.rtl ) {
|
|
navigateLeft();
|
|
}
|
|
else {
|
|
navigateRight();
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Checks if the target element prevents the triggering of
|
|
* swipe navigation.
|
|
*/
|
|
function isSwipePrevented( target ) {
|
|
|
|
while( target && typeof target.hasAttribute === 'function' ) {
|
|
if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
|
|
target = target.parentNode;
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
// --------------------------------------------------------------------//
|
|
// ----------------------------- EVENTS -------------------------------//
|
|
// --------------------------------------------------------------------//
|
|
|
|
/**
|
|
* Called by all event handlers that are based on user
|
|
* input.
|
|
*/
|
|
function onUserInput( event ) {
|
|
|
|
if( config.autoSlideStoppable ) {
|
|
pauseAutoSlide();
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Handler for the document level 'keypress' event.
|
|
*/
|
|
function onDocumentKeyPress( event ) {
|
|
|
|
// Check if the pressed key is question mark
|
|
if( event.shiftKey && event.charCode === 63 ) {
|
|
if( dom.overlay ) {
|
|
closeOverlay();
|
|
}
|
|
else {
|
|
showHelp( true );
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Handler for the document level 'keydown' event.
|
|
*/
|
|
function onDocumentKeyDown( event ) {
|
|
|
|
// If there's a condition specified and it returns false,
|
|
// ignore this event
|
|
if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
|
|
return true;
|
|
}
|
|
|
|
// Remember if auto-sliding was paused so we can toggle it
|
|
var autoSlideWasPaused = autoSlidePaused;
|
|
|
|
onUserInput( event );
|
|
|
|
// Check if there's a focused element that could be using
|
|
// the keyboard
|
|
var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
|
|
var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
|
|
|
|
// Disregard the event if there's a focused element or a
|
|
// keyboard modifier key is present
|
|
if( activeElementIsCE || activeElementIsInput || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
|
|
|
|
// While paused only allow resume keyboard events; 'b', '.''
|
|
var resumeKeyCodes = [66,190,191];
|
|
var key;
|
|
|
|
// Custom key bindings for togglePause should be able to resume
|
|
if( typeof config.keyboard === 'object' ) {
|
|
for( key in config.keyboard ) {
|
|
if( config.keyboard[key] === 'togglePause' ) {
|
|
resumeKeyCodes.push( parseInt( key, 10 ) );
|
|
}
|
|
}
|
|
}
|
|
|
|
if( isPaused() && resumeKeyCodes.indexOf( event.keyCode ) === -1 ) {
|
|
return false;
|
|
}
|
|
|
|
var triggered = false;
|
|
|
|
// 1. User defined key bindings
|
|
if( typeof config.keyboard === 'object' ) {
|
|
|
|
for( key in config.keyboard ) {
|
|
|
|
// Check if this binding matches the pressed key
|
|
if( parseInt( key, 10 ) === event.keyCode ) {
|
|
|
|
var value = config.keyboard[ key ];
|
|
|
|
// Callback function
|
|
if( typeof value === 'function' ) {
|
|
value.apply( null, [ event ] );
|
|
}
|
|
// String shortcuts to reveal.js API
|
|
else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
|
|
Reveal[ value ].call();
|
|
}
|
|
|
|
triggered = true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
// 2. System defined key bindings
|
|
if( triggered === false ) {
|
|
|
|
// Assume true and try to prove false
|
|
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: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
|
|
// return
|
|
case 13: isOverview() ? deactivateOverview() : triggered = false; break;
|
|
// two-spot, semicolon, b, period, Logitech presenter tools "black screen" button
|
|
case 58: case 59: case 66: case 190: case 191: togglePause(); break;
|
|
// f
|
|
case 70: enterFullscreen(); break;
|
|
// a
|
|
case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
|
|
default:
|
|
triggered = false;
|
|
}
|
|
|
|
}
|
|
|
|
// If the input resulted in a triggered action we should prevent
|
|
// the browsers default behavior
|
|
if( triggered ) {
|
|
event.preventDefault && event.preventDefault();
|
|
}
|
|
// ESC or O key
|
|
else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
|
|
if( dom.overlay ) {
|
|
closeOverlay();
|
|
}
|
|
else {
|
|
toggleOverview();
|
|
}
|
|
|
|
event.preventDefault && event.preventDefault();
|
|
}
|
|
|
|
// If auto-sliding is enabled we need to cue up
|
|
// another timeout
|
|
cueAutoSlide();
|
|
|
|
}
|
|
|
|
/**
|
|
* Handler for the 'touchstart' event, enables support for
|
|
* swipe and pinch gestures.
|
|
*/
|
|
function onTouchStart( event ) {
|
|
|
|
if( isSwipePrevented( event.target ) ) return true;
|
|
|
|
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 'touchmove' event.
|
|
*/
|
|
function onTouchMove( event ) {
|
|
|
|
if( isSwipePrevented( event.target ) ) return true;
|
|
|
|
// Each touch should only trigger one action
|
|
if( !touch.captured ) {
|
|
onUserInput( event );
|
|
|
|
var currentX = event.touches[0].clientX;
|
|
var currentY = event.touches[0].clientY;
|
|
|
|
// If the touch started 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.captured = 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.captured = true;
|
|
navigateLeft();
|
|
}
|
|
else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
|
|
touch.captured = true;
|
|
navigateRight();
|
|
}
|
|
else if( deltaY > touch.threshold ) {
|
|
touch.captured = true;
|
|
navigateUp();
|
|
}
|
|
else if( deltaY < -touch.threshold ) {
|
|
touch.captured = true;
|
|
navigateDown();
|
|
}
|
|
|
|
// If we're embedded, only block touch events if they have
|
|
// triggered an action
|
|
if( config.embedded ) {
|
|
if( touch.captured || isVerticalSlide( currentSlide ) ) {
|
|
event.preventDefault();
|
|
}
|
|
}
|
|
// Not embedded? Block them all to avoid needless tossing
|
|
// around of the viewport in iOS
|
|
else {
|
|
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 'touchend' event.
|
|
*/
|
|
function onTouchEnd( event ) {
|
|
|
|
touch.captured = false;
|
|
|
|
}
|
|
|
|
/**
|
|
* Convert pointer down to touch start.
|
|
*/
|
|
function onPointerDown( event ) {
|
|
|
|
if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
|
|
event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
|
|
onTouchStart( event );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Convert pointer move to touch move.
|
|
*/
|
|
function onPointerMove( event ) {
|
|
|
|
if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
|
|
event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
|
|
onTouchMove( event );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Convert pointer up to touch end.
|
|
*/
|
|
function onPointerUp( event ) {
|
|
|
|
if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
|
|
event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
|
|
onTouchEnd( event );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Handles mouse wheel scrolling, throttled to avoid skipping
|
|
* multiple slides.
|
|
*/
|
|
function onDocumentMouseScroll( event ) {
|
|
|
|
if( Date.now() - lastMouseWheelStep > 600 ) {
|
|
|
|
lastMouseWheelStep = Date.now();
|
|
|
|
var delta = event.detail || -event.wheelDelta;
|
|
if( delta > 0 ) {
|
|
navigateNext();
|
|
}
|
|
else {
|
|
navigatePrev();
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Clicking on the progress bar results in a navigation to the
|
|
* closest approximate horizontal slide using this equation:
|
|
*
|
|
* ( clickX / presentationWidth ) * numberOfSlides
|
|
*/
|
|
function onProgressClicked( event ) {
|
|
|
|
onUserInput( event );
|
|
|
|
event.preventDefault();
|
|
|
|
var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
|
|
var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
|
|
|
|
if( config.rtl ) {
|
|
slideIndex = slidesTotal - slideIndex;
|
|
}
|
|
|
|
slide( slideIndex );
|
|
|
|
}
|
|
|
|
/**
|
|
* Event handler for navigation control buttons.
|
|
*/
|
|
function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
|
|
function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
|
|
function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
|
|
function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
|
|
function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
|
|
function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
|
|
|
|
/**
|
|
* Handler for the window level 'hashchange' event.
|
|
*/
|
|
function onWindowHashChange( event ) {
|
|
|
|
readURL();
|
|
|
|
}
|
|
|
|
/**
|
|
* Handler for the window level 'resize' event.
|
|
*/
|
|
function onWindowResize( event ) {
|
|
|
|
layout();
|
|
|
|
}
|
|
|
|
/**
|
|
* Handle for the window level 'visibilitychange' event.
|
|
*/
|
|
function onPageVisibilityChange( event ) {
|
|
|
|
var isHidden = document.webkitHidden ||
|
|
document.msHidden ||
|
|
document.hidden;
|
|
|
|
// If, after clicking a link or similar and we're coming back,
|
|
// focus the document.body to ensure we can use keyboard shortcuts
|
|
if( isHidden === 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();
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* 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( eventsAreBound && isOverview() ) {
|
|
event.preventDefault();
|
|
|
|
var element = event.target;
|
|
|
|
while( element && !element.nodeName.match( /section/gi ) ) {
|
|
element = element.parentNode;
|
|
}
|
|
|
|
if( element && !element.classList.contains( 'disabled' ) ) {
|
|
|
|
deactivateOverview();
|
|
|
|
if( element.nodeName.match( /section/gi ) ) {
|
|
var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
|
|
v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
|
|
|
|
slide( h, v );
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Handles clicks on links that are set to preview in the
|
|
* iframe overlay.
|
|
*/
|
|
function onPreviewLinkClicked( event ) {
|
|
|
|
if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
|
|
var url = event.currentTarget.getAttribute( 'href' );
|
|
if( url ) {
|
|
showPreview( url );
|
|
event.preventDefault();
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Handles click on the auto-sliding controls element.
|
|
*/
|
|
function onAutoSlidePlayerClick( event ) {
|
|
|
|
// Replay
|
|
if( Reveal.isLastSlide() && config.loop === false ) {
|
|
slide( 0, 0 );
|
|
resumeAutoSlide();
|
|
}
|
|
// Resume
|
|
else if( autoSlidePaused ) {
|
|
resumeAutoSlide();
|
|
}
|
|
// Pause
|
|
else {
|
|
pauseAutoSlide();
|
|
}
|
|
|
|
}
|
|
|
|
|
|
// --------------------------------------------------------------------//
|
|
// ------------------------ PLAYBACK COMPONENT ------------------------//
|
|
// --------------------------------------------------------------------//
|
|
|
|
|
|
/**
|
|
* Constructor for the playback component, which displays
|
|
* play/pause/progress controls.
|
|
*
|
|
* @param {HTMLElement} container The component will append
|
|
* itself to this
|
|
* @param {Function} progressCheck A method which will be
|
|
* called frequently to get the current progress on a range
|
|
* of 0-1
|
|
*/
|
|
function Playback( container, progressCheck ) {
|
|
|
|
// Cosmetics
|
|
this.diameter = 100;
|
|
this.diameter2 = this.diameter/2;
|
|
this.thickness = 6;
|
|
|
|
// Flags if we are currently playing
|
|
this.playing = false;
|
|
|
|
// Current progress on a 0-1 range
|
|
this.progress = 0;
|
|
|
|
// Used to loop the animation smoothly
|
|
this.progressOffset = 1;
|
|
|
|
this.container = container;
|
|
this.progressCheck = progressCheck;
|
|
|
|
this.canvas = document.createElement( 'canvas' );
|
|
this.canvas.className = 'playback';
|
|
this.canvas.width = this.diameter;
|
|
this.canvas.height = this.diameter;
|
|
this.canvas.style.width = this.diameter2 + 'px';
|
|
this.canvas.style.height = this.diameter2 + 'px';
|
|
this.context = this.canvas.getContext( '2d' );
|
|
|
|
this.container.appendChild( this.canvas );
|
|
|
|
this.render();
|
|
|
|
}
|
|
|
|
Playback.prototype.setPlaying = function( value ) {
|
|
|
|
var wasPlaying = this.playing;
|
|
|
|
this.playing = value;
|
|
|
|
// Start repainting if we weren't already
|
|
if( !wasPlaying && this.playing ) {
|
|
this.animate();
|
|
}
|
|
else {
|
|
this.render();
|
|
}
|
|
|
|
};
|
|
|
|
Playback.prototype.animate = function() {
|
|
|
|
var progressBefore = this.progress;
|
|
|
|
this.progress = this.progressCheck();
|
|
|
|
// When we loop, offset the progress so that it eases
|
|
// smoothly rather than immediately resetting
|
|
if( progressBefore > 0.8 && this.progress < 0.2 ) {
|
|
this.progressOffset = this.progress;
|
|
}
|
|
|
|
this.render();
|
|
|
|
if( this.playing ) {
|
|
features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
|
|
}
|
|
|
|
};
|
|
|
|
/**
|
|
* Renders the current progress and playback state.
|
|
*/
|
|
Playback.prototype.render = function() {
|
|
|
|
var progress = this.playing ? this.progress : 0,
|
|
radius = ( this.diameter2 ) - this.thickness,
|
|
x = this.diameter2,
|
|
y = this.diameter2,
|
|
iconSize = 28;
|
|
|
|
// Ease towards 1
|
|
this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
|
|
|
|
var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
|
|
var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
|
|
|
|
this.context.save();
|
|
this.context.clearRect( 0, 0, this.diameter, this.diameter );
|
|
|
|
// Solid background color
|
|
this.context.beginPath();
|
|
this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
|
|
this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
|
|
this.context.fill();
|
|
|
|
// Draw progress track
|
|
this.context.beginPath();
|
|
this.context.arc( x, y, radius, 0, Math.PI * 2, false );
|
|
this.context.lineWidth = this.thickness;
|
|
this.context.strokeStyle = '#666';
|
|
this.context.stroke();
|
|
|
|
if( this.playing ) {
|
|
// Draw progress on top of track
|
|
this.context.beginPath();
|
|
this.context.arc( x, y, radius, startAngle, endAngle, false );
|
|
this.context.lineWidth = this.thickness;
|
|
this.context.strokeStyle = '#fff';
|
|
this.context.stroke();
|
|
}
|
|
|
|
this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
|
|
|
|
// Draw play/pause icons
|
|
if( this.playing ) {
|
|
this.context.fillStyle = '#fff';
|
|
this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
|
|
this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
|
|
}
|
|
else {
|
|
this.context.beginPath();
|
|
this.context.translate( 4, 0 );
|
|
this.context.moveTo( 0, 0 );
|
|
this.context.lineTo( iconSize - 4, iconSize / 2 );
|
|
this.context.lineTo( 0, iconSize );
|
|
this.context.fillStyle = '#fff';
|
|
this.context.fill();
|
|
}
|
|
|
|
this.context.restore();
|
|
|
|
};
|
|
|
|
Playback.prototype.on = function( type, listener ) {
|
|
this.canvas.addEventListener( type, listener, false );
|
|
};
|
|
|
|
Playback.prototype.off = function( type, listener ) {
|
|
this.canvas.removeEventListener( type, listener, false );
|
|
};
|
|
|
|
Playback.prototype.destroy = function() {
|
|
|
|
this.playing = false;
|
|
|
|
if( this.canvas.parentNode ) {
|
|
this.container.removeChild( this.canvas );
|
|
}
|
|
|
|
};
|
|
|
|
|
|
// --------------------------------------------------------------------//
|
|
// ------------------------------- API --------------------------------//
|
|
// --------------------------------------------------------------------//
|
|
|
|
|
|
Reveal = {
|
|
VERSION: VERSION,
|
|
|
|
initialize: initialize,
|
|
configure: configure,
|
|
sync: sync,
|
|
|
|
// Navigation methods
|
|
slide: slide,
|
|
left: navigateLeft,
|
|
right: navigateRight,
|
|
up: navigateUp,
|
|
down: navigateDown,
|
|
prev: navigatePrev,
|
|
next: navigateNext,
|
|
|
|
// Fragment methods
|
|
navigateFragment: navigateFragment,
|
|
prevFragment: previousFragment,
|
|
nextFragment: nextFragment,
|
|
|
|
// Deprecated aliases
|
|
navigateTo: slide,
|
|
navigateLeft: navigateLeft,
|
|
navigateRight: navigateRight,
|
|
navigateUp: navigateUp,
|
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navigateDown: navigateDown,
|
|
navigatePrev: navigatePrev,
|
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navigateNext: navigateNext,
|
|
|
|
// Forces an update in slide layout
|
|
layout: layout,
|
|
|
|
// Returns an object with the available routes as booleans (left/right/top/bottom)
|
|
availableRoutes: availableRoutes,
|
|
|
|
// Returns an object with the available fragments as booleans (prev/next)
|
|
availableFragments: availableFragments,
|
|
|
|
// Toggles the overview mode on/off
|
|
toggleOverview: toggleOverview,
|
|
|
|
// Toggles the "black screen" mode on/off
|
|
togglePause: togglePause,
|
|
|
|
// Toggles the auto slide mode on/off
|
|
toggleAutoSlide: toggleAutoSlide,
|
|
|
|
// State checks
|
|
isOverview: isOverview,
|
|
isPaused: isPaused,
|
|
isAutoSliding: isAutoSliding,
|
|
|
|
// Adds or removes all internal event listeners (such as keyboard)
|
|
addEventListeners: addEventListeners,
|
|
removeEventListeners: removeEventListeners,
|
|
|
|
// Facility for persisting and restoring the presentation state
|
|
getState: getState,
|
|
setState: setState,
|
|
|
|
// Presentation progress on range of 0-1
|
|
getProgress: getProgress,
|
|
|
|
// Returns the indices of the current, or specified, slide
|
|
getIndices: getIndices,
|
|
|
|
getTotalSlides: getTotalSlides,
|
|
|
|
// Returns the slide element at the specified index
|
|
getSlide: getSlide,
|
|
|
|
// Returns the slide background element at the specified index
|
|
getSlideBackground: getSlideBackground,
|
|
|
|
// Returns the speaker notes string for a slide, or null
|
|
getSlideNotes: getSlideNotes,
|
|
|
|
// Returns the previous slide element, may be null
|
|
getPreviousSlide: function() {
|
|
return previousSlide;
|
|
},
|
|
|
|
// Returns the current slide element
|
|
getCurrentSlide: function() {
|
|
return currentSlide;
|
|
},
|
|
|
|
// Returns the current scale of the presentation content
|
|
getScale: function() {
|
|
return scale;
|
|
},
|
|
|
|
// Returns the current configuration object
|
|
getConfig: function() {
|
|
return config;
|
|
},
|
|
|
|
// 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();
|
|
} );
|
|
|
|
// Basic deserialization
|
|
for( var i in query ) {
|
|
var value = query[ i ];
|
|
|
|
query[ i ] = deserialize( unescape( value ) );
|
|
}
|
|
|
|
return query;
|
|
},
|
|
|
|
// Returns true if we're currently on the first slide
|
|
isFirstSlide: function() {
|
|
return ( indexh === 0 && indexv === 0 );
|
|
},
|
|
|
|
// Returns true if we're currently on the last slide
|
|
isLastSlide: function() {
|
|
if( currentSlide ) {
|
|
// Does this slide has next a 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;
|
|
},
|
|
|
|
// Checks if reveal.js has been loaded and is ready for use
|
|
isReady: function() {
|
|
return loaded;
|
|
},
|
|
|
|
// 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 );
|
|
}
|
|
},
|
|
|
|
// Programatically triggers a keyboard event
|
|
triggerKey: function( keyCode ) {
|
|
onDocumentKeyDown( { keyCode: keyCode } );
|
|
},
|
|
|
|
// Registers a new shortcut to include in the help overlay
|
|
registerKeyboardShortcut: function( key, value ) {
|
|
keyboardShortcuts[key] = value;
|
|
}
|
|
};
|
|
|
|
return Reveal;
|
|
|
|
}));
|