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share/public/revealjs/js/reveal.js  view on Meta::CPAN

			// Number of slides away from the current that are visible
			viewDistance: 3,

			// The display mode that will be used to show slides
			display: 'block',

			// Script dependencies to load
			dependencies: []

		},

		// Flags if Reveal.initialize() has been called
		initialized = false,

		// Flags if reveal.js is loaded (has dispatched the 'ready' event)
		loaded = false,

		// Flags if the overview mode is currently active
		overview = false,

		// Holds the dimensions of our overview slides, including margins
		overviewSlideWidth = null,
		overviewSlideHeight = null,

		// The horizontal and vertical index of the currently active slide
		indexh,
		indexv,

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

		previousBackground,

		// Remember which directions that the user has navigated towards
		hasNavigatedRight = false,
		hasNavigatedDown = false,

		// 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 = [],

		// The current scale of the presentation (see width/height config)
		scale = 1,

		// CSS transform that is currently applied to the slides container,
		// split into two groups
		slidesTransform = { layout: '', overview: '' },

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

		// Features supported by the browser, see #checkCapabilities()
		features = {},

		// Client is a mobile device, see #checkCapabilities()
		isMobileDevice,

		// Client is a desktop Chrome, see #checkCapabilities()
		isChrome,

		// Throttles mouse wheel navigation
		lastMouseWheelStep = 0,

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

		// Flags if the interaction event listeners are bound
		eventsAreBound = false,

		// The current auto-slide duration
		autoSlide = 0,

		// Auto slide properties
		autoSlidePlayer,
		autoSlideTimeout = 0,
		autoSlideStartTime = -1,
		autoSlidePaused = false,

		// Holds information about the currently ongoing touch input
		touch = {
			startX: 0,
			startY: 0,
			startSpan: 0,
			startCount: 0,
			captured: false,
			threshold: 40
		},

		// Holds information about the keyboard shortcuts
		keyboardShortcuts = {
			'N  ,  SPACE':			'Next slide',
			'P':					'Previous slide',
			'←  ,  H':		'Navigate left',
			'→  ,  L':		'Navigate right',
			'↑  ,  K':		'Navigate up',
			'↓  ,  J':		'Navigate down',
			'Home':					'First slide',
			'End':					'Last slide',
			'B  ,  .':				'Pause',
			'F':					'Fullscreen',
			'ESC, O':				'Slide overview'
		},

		// Holds custom key code mappings
		registeredKeyBindings = {};

	/**
	 * Starts up the presentation if the client is capable.
	 */
	function initialize( options ) {

		// Make sure we only initialize once
		if( initialized === true ) return;

		initialized = true;

		checkCapabilities();

share/public/revealjs/js/reveal.js  view on Meta::CPAN

			}

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

		// Cache references to key DOM elements
		dom.wrapper = document.querySelector( '.reveal' );
		dom.slides = document.querySelector( '.reveal .slides' );

		// Force a layout when the whole page, incl fonts, has loaded
		window.addEventListener( 'load', layout, false );

		var query = Reveal.getQueryHash();

		// Do not accept new dependencies via query config to avoid
		// the potential of malicious script injection
		if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];

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

		// Hide the address bar in mobile browsers
		hideAddressBar();

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

	}

	/**
	 * Inspect the client to see what it's capable of, this
	 * should only happens once per runtime.
	 */
	function checkCapabilities() {

		isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA );
		isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );

		var testElement = document.createElement( 'div' );

		features.transforms3d = 'WebkitPerspective' in testElement.style ||
								'MozPerspective' in testElement.style ||
								'msPerspective' in testElement.style ||
								'OPerspective' in testElement.style ||
								'perspective' in testElement.style;

		features.transforms2d = 'WebkitTransform' in testElement.style ||
								'MozTransform' in testElement.style ||
								'msTransform' in testElement.style ||
								'OTransform' in testElement.style ||
								'transform' in testElement.style;

		features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
		features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';

		features.canvas = !!document.createElement( 'canvas' ).getContext;

		// Transitions in the overview are disabled in desktop and
		// Safari due to lag
		features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );

		// Flags if we should use zoom instead of transform to scale
		// up slides. Zoom produces crisper results but has a lot of
		// xbrowser quirks so we only use it in whitelsited browsers.
		features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
						( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );

	}

	/**
	 * 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 = [],
			scriptsToPreload = 0;

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

			start();
		}

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

				if( --scriptsToPreload === 0 ) {
					proceed();
				}
			});
		}

		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 );
				}

				loadScript( s );