reveal.js

/*!
 * reveal.js 2.1 r27
 * http://lab.hakim.se/reveal-js
 * MIT licensed
 * 
 * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
 */
var Reveal = (function(){

	'use strict';
	
	var HORIZONTAL_SLIDES_SELECTOR = '.reveal .slides>section',
		VERTICAL_SLIDES_SELECTOR = '.reveal .slides>section.present>section',

		// Configurations defaults, can be overridden at initialization time 
		config = {
			// Display controls in the bottom right corner
			controls: true,

			// Display a presentation progress bar
			progress: true,

			// Push each slide change to the browser history
			history: false,

			// Enable keyboard shortcuts for navigation
			keyboard: true,

			// Enable the slide overview mode
			overview: true,

			// Loop the presentation
			loop: false,

			// Number of milliseconds between automatically proceeding to the 
			// next slide, disabled when set to 0
			autoSlide: 0,

			// Enable slide navigation via mouse wheel
			mouseWheel: true,

			// Apply a 3D roll to links on hover
			rollingLinks: true,

			// Transition style (see /css/theme)
			theme: 'default', 

			// Transition style
			transition: 'default', // default/cube/page/concave/linear(2d),

			// Script dependencies to load
			dependencies: []
		},

		// The horizontal and verical index of the currently active slide
		indexh = 0,
		indexv = 0,

		// The previous and current slide HTML elements
		previousSlide,
		currentSlide,

		// Slides may hold a data-state attribute which we pick up and apply 
		// as a class to the body. This list contains the combined state of 
		// all current slides.
		state = [],

		// Cached references to DOM elements
		dom = {},

		// Detect support for CSS 3D transforms
		supports3DTransforms =  'WebkitPerspective' in document.body.style ||
								'MozPerspective' in document.body.style ||
								'msPerspective' in document.body.style ||
								'OPerspective' in document.body.style ||
								'perspective' in document.body.style,
		
		supports2DTransforms =  'WebkitTransform' in document.body.style ||
								'MozTransform' in document.body.style ||
								'msTransform' in document.body.style ||
								'OTransform' in document.body.style ||
								'transform' in document.body.style,
		
		// Throttles mouse wheel navigation
		mouseWheelTimeout = 0,

		// An interval used to automatically move on to the next slide
		autoSlideTimeout = 0,

		// Delays updates to the URL due to a Chrome thumbnailer bug
		writeURLTimeout = 0,

		// Holds information about the currently ongoing touch input
		touch = {
			startX: 0,
			startY: 0,
			startSpan: 0,
			startCount: 0,
			handled: false,
			threshold: 40
		};
	
	
	/**
	 * Starts up the presentation if the client is capable.
	 */
	function initialize( options ) {
		if( ( !supports2DTransforms && !supports3DTransforms ) ) {
			document.body.setAttribute( 'class', 'no-transforms' );

			// If the browser doesn't support core features we won't be 
			// using JavaScript to control the presentation
			return;
		}

		// Copy options over to our config object
		extend( config, options );

		// Cache references to DOM elements
		dom.theme = document.querySelector( '#theme' );
		dom.wrapper = document.querySelector( '.reveal' );
		dom.progress = document.querySelector( '.reveal .progress' );
		dom.progressbar = document.querySelector( '.reveal .progress span' );

		if ( config.controls ) {
			dom.controls = document.querySelector( '.reveal .controls' );
			dom.controlsLeft = document.querySelector( '.reveal .controls .left' );
			dom.controlsRight = document.querySelector( '.reveal .controls .right' );
			dom.controlsUp = document.querySelector( '.reveal .controls .up' );
			dom.controlsDown = document.querySelector( '.reveal .controls .down' );
		}

		// Loads the dependencies and continues to #start() once done
		load();

		// Set up hiding of the browser address bar
		if( navigator.userAgent.match( /(iphone|ipod|android)/i ) ) {
			// Give the page some scrollable overflow
			document.documentElement.style.overflow = 'scroll';
			document.body.style.height = '120%';

			// Events that should trigger the address bar to hide
			window.addEventListener( 'load', removeAddressBar, false );
			window.addEventListener( 'orientationchange', removeAddressBar, false );
		}
		
	}

	/**
	 * Loads the dependencies of reveal.js. Dependencies are 
	 * defined via the configuration option 'dependencies' 
	 * and will be loaded prior to starting/binding reveal.js. 
	 * Some dependencies may have an 'async' flag, if so they 
	 * will load after reveal.js has been started up.
	 */
	function load() {
		var scripts = [],
			scriptsAsync = [];

		for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
			var s = config.dependencies[i];

			// Load if there's no condition or the condition is truthy
			if( !s.condition || s.condition() ) {
				if( s.async ) {
					scriptsAsync.push( s.src );
				}
				else {
					scripts.push( s.src );
				}

				// Extension may contain callback functions
				if( typeof s.callback === 'function' ) {
					head.ready( s.src.match( /([\w\d_\-]*)\.?[^\\\/]*$/i )[0], s.callback );
				}
			}
		}

		// Called once synchronous scritps finish loading
		function proceed() {
			// Load asynchronous scripts
			head.js.apply( null, scriptsAsync );
			
			start();
		}

		if( scripts.length ) {
			head.ready( proceed );

			// Load synchronous scripts
			head.js.apply( null, scripts );
		}
		else {
			proceed();
		}
	}

	/**
	 * Starts up reveal.js by binding input events and navigating 
	 * to the current URL deeplink if there is one.