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- /*!
- * reveal.js 2.1 r34
- * 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, this value can be overwritten
- // by using a data-autoslide attribute on your slides
- 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: null,
- // Transition style
- transition: 'default', // default/cube/page/concave/zoom/linear/none
- // Script dependencies to load
- dependencies: []
- },
- // Stores if the next slide should be shown automatically
- // after n milliseconds
- autoSlide = config.autoSlide,
- // 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: 80
- };
-
- /**
- * 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 );
- // Hide the address bar in mobile browsers
- hideAddressBar();
- // Loads the dependencies and continues to #start() once done
- load();
-
- }
- /**
- * Finds and stores references to DOM elements which are
- * required by the presentation. If a required element is
- * not found, it is created.
- */
- function setupDOM() {
- // Cache references to key DOM elements
- dom.theme = document.querySelector( '#theme' );
- dom.wrapper = document.querySelector( '.reveal' );
- // Progress bar
- if( !dom.wrapper.querySelector( '.progress' ) && config.progress ) {
- var progressElement = document.createElement( 'div' );
- progressElement.classList.add( 'progress' );
- progressElement.innerHTML = '<span></span>';
- dom.wrapper.appendChild( progressElement );
- }
- // Arrow controls
- if( !dom.wrapper.querySelector( '.controls' ) && config.controls ) {
- var controlsElement = document.createElement( 'aside' );
- controlsElement.classList.add( 'controls' );
- controlsElement.innerHTML = '<a class="left" href="#">◄</a>' +
- '<a class="right" href="#">►</a>' +
- '<a class="up" href="#">▲</a>' +
- '<a class="down" href="#">▼</a>';
- dom.wrapper.appendChild( controlsElement );
- }
- // Presentation background element
- if( !dom.wrapper.querySelector( '.state-background' ) ) {
- var backgroundElement = document.createElement( 'div' );
- backgroundElement.classList.add( 'state-background' );
- dom.wrapper.appendChild( backgroundElement );
- }
- // Overlay graphic which is displayed during the paused mode
- if( !dom.wrapper.querySelector( '.pause-overlay' ) ) {
- var pausedElement = document.createElement( 'div' );
- pausedElement.classList.add( 'pause-overlay' );
- dom.wrapper.appendChild( pausedElement );
- }
- // Cache references to elements
- 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' );
- }
- }
- /**
- * Hides the address bar if we're on a mobile device.
- */
- function hideAddressBar() {
- 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.
- */
- function start() {
- // Make sure we've got all the DOM elements we need
- setupDOM();
-
- // Subscribe to input
- addEventListeners();
- // Updates the presentation to match the current configuration values
- configure();
- // Read the initial hash
- readURL();
- // Start auto-sliding if it's enabled
- cueAutoSlide();
- // Notify listeners that the presentation is ready
- dispatchEvent( 'ready', {
- 'indexh': indexh,
- 'indexv': indexv,
- 'currentSlide': currentSlide
- } );
- }
- /**
- * Applies the configuration settings from the config object.
- */
- function configure() {
- if( supports3DTransforms === false ) {
- config.transition = 'linear';
- }
- if( config.controls && dom.controls ) {
- dom.controls.style.display = 'block';
- }
- if( config.progress && dom.progress ) {
- dom.progress.style.display = 'block';
- }
- if( config.transition !== 'default' ) {
- dom.wrapper.classList.add( config.transition );
- }
- if( config.mouseWheel ) {
- document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
- document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
- }
- // 3D links
- if( config.rollingLinks ) {
- linkify();
- }
- // Load the theme in the config, if it's not already loaded
- if( config.theme && dom.theme ) {
- var themeURL = dom.theme.getAttribute( 'href' );
- var themeFinder = /[^\/]*?(?=\.css)/;
- var themeName = themeURL.match(themeFinder)[0];
- if( config.theme !== themeName ) {
- themeURL = themeURL.replace(themeFinder, config.theme);
- dom.theme.setAttribute( 'href', themeURL );
- }
- }
- }
- /**
- * Binds all event listeners.
- */
- function addEventListeners() {
- document.addEventListener( 'touchstart', onDocumentTouchStart, false );
- document.addEventListener( 'touchmove', onDocumentTouchMove, false );
- document.addEventListener( 'touchend', onDocumentTouchEnd, false );
- window.addEventListener( 'hashchange', onWindowHashChange, false );
- if( config.keyboard ) {
- document.addEventListener( 'keydown', onDocumentKeyDown, false );
- }
- if ( config.controls && dom.controls ) {
- dom.controlsLeft.addEventListener( 'click', preventAndForward( navigateLeft ), false );
- dom.controlsRight.addEventListener( 'click', preventAndForward( navigateRight ), false );
- dom.controlsUp.addEventListener( 'click', preventAndForward( navigateUp ), false );
- dom.controlsDown.addEventListener( 'click', preventAndForward( navigateDown ), false );
- }
- }
- /**
- * Unbinds all event listeners.
- */
- function removeEventListeners() {
- document.removeEventListener( 'keydown', onDocumentKeyDown, false );
- document.removeEventListener( 'touchstart', onDocumentTouchStart, false );
- document.removeEventListener( 'touchmove', onDocumentTouchMove, false );
- document.removeEventListener( 'touchend', onDocumentTouchEnd, false );
- window.removeEventListener( 'hashchange', onWindowHashChange, false );
-
- if ( config.controls && dom.controls ) {
- dom.controlsLeft.removeEventListener( 'click', preventAndForward( navigateLeft ), false );
- dom.controlsRight.removeEventListener( 'click', preventAndForward( navigateRight ), false );
- dom.controlsUp.removeEventListener( 'click', preventAndForward( navigateUp ), false );
- dom.controlsDown.removeEventListener( 'click', preventAndForward( navigateDown ), 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 ];
- }
- }
- /**
- * 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 );
- }
- /**
- * Prevents an events defaults behavior calls the
- * specified delegate.
- *
- * @param {Function} delegate The method to call
- * after the wrapper has been executed
- */
- function preventAndForward( delegate ) {
- return function( event ) {
- event.preventDefault();
- delegate.call();
- };
- }
- /**
- * Causes the address bar to hide on mobile devices,
- * more vertical space ftw.
- */
- function removeAddressBar() {
- setTimeout( function() {
- window.scrollTo( 0, 1 );
- }, 0 );
- }
- /**
- * Dispatches an event of the specified type from the
- * reveal DOM element.
- */
- function dispatchEvent( type, properties ) {
- var event = document.createEvent( "HTMLEvents", 1, 2 );
- event.initEvent( type, true, true );
- extend( event, properties );
- dom.wrapper.dispatchEvent( event );
- }
- /**
- * Wrap all links in 3D goodness.
- */
- function linkify() {
- if( supports3DTransforms && !( 'msPerspective' in document.body.style ) ) {
- var nodes = document.querySelectorAll( '.reveal .slides section a:not(.image)' );
- for( var i = 0, len = nodes.length; i < len; i++ ) {
- var node = nodes[i];
-
- if( node.textContent && !node.querySelector( 'img' ) && ( !node.className || !node.classList.contains( node, 'roll' ) ) ) {
- node.classList.add( 'roll' );
- node.innerHTML = '<span data-title="'+ node.text +'">' + node.innerHTML + '</span>';
- }
- }
- }
- }
- /**
- * Displays the overview of slides (quick nav) by
- * scaling down and arranging all slide elements.
- *
- * Experimental feature, might be dropped if perf
- * can't be improved.
- */
- function activateOverview() {
- // Only proceed if enabled in config
- if( config.overview ) {
-
- dom.wrapper.classList.add( 'overview' );
- var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
- for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
- var hslide = horizontalSlides[i],
- htransform = 'translateZ(-2500px) translate(' + ( ( i - indexh ) * 105 ) + '%, 0%)';
-
- hslide.setAttribute( 'data-index-h', i );
- hslide.style.display = 'block';
- hslide.style.WebkitTransform = htransform;
- hslide.style.MozTransform = htransform;
- hslide.style.msTransform = htransform;
- hslide.style.OTransform = htransform;
- hslide.style.transform = htransform;
-
- if( !hslide.classList.contains( 'stack' ) ) {
- // Navigate to this slide on click
- hslide.addEventListener( 'click', onOverviewSlideClicked, true );
- }
-
- var verticalSlides = hslide.querySelectorAll( 'section' );
- for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
- var vslide = verticalSlides[j],
- vtransform = 'translate(0%, ' + ( ( j - ( i === indexh ? indexv : 0 ) ) * 105 ) + '%)';
- vslide.setAttribute( 'data-index-h', i );
- vslide.setAttribute( 'data-index-v', j );
- vslide.style.display = 'block';
- vslide.style.WebkitTransform = vtransform;
- vslide.style.MozTransform = vtransform;
- vslide.style.msTransform = vtransform;
- vslide.style.OTransform = vtransform;
- vslide.style.transform = vtransform;
- // Navigate to this slide on click
- vslide.addEventListener( 'click', onOverviewSlideClicked, true );
- }
-
- }
- }
- }
-
- /**
- * Exits the slide overview and enters the currently
- * active slide.
- */
- function deactivateOverview() {
-
- // Only proceed if enabled in config
- if( config.overview ) {
- dom.wrapper.classList.remove( 'overview' );
- // Select all slides
- var slides = Array.prototype.slice.call( document.querySelectorAll( '.reveal .slides section' ) );
- for( var i = 0, len = slides.length; i < len; i++ ) {
- var element = slides[i];
- // Resets all transforms to use the external styles
- element.style.WebkitTransform = '';
- element.style.MozTransform = '';
- element.style.msTransform = '';
- element.style.OTransform = '';
- element.style.transform = '';
- element.removeEventListener( 'click', onOverviewSlideClicked );
- }
- slide();
-
- }
- }
- /**
- * Toggles the slide overview mode on and off.
- *
- * @param {Boolean} override Optional flag which overrides the
- * toggle logic and forcibly sets the desired state. True means
- * overview is open, false means it's closed.
- */
- function toggleOverview( override ) {
- if( typeof override === 'boolean' ) {
- override ? activateOverview() : deactivateOverview();
- }
- else {
- isOverviewActive() ? deactivateOverview() : activateOverview();
- }
- }
- /**
- * Checks if the overview is currently active.
- *
- * @return {Boolean} true if the overview is active,
- * false otherwise
- */
- function isOverviewActive() {
- return dom.wrapper.classList.contains( 'overview' );
- }
- /**
- * Handling the fullscreen functionality via the fullscreen API
- *
- * @see http://fullscreen.spec.whatwg.org/
- * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
- */
- function enterFullscreen() {
- var element = document.body;
-
- // Check which implementation is available
- var requestMethod = element.requestFullScreen ||
- element.webkitRequestFullScreen ||
- element.mozRequestFullScreen ||
- element.msRequestFullScreen;
-
- if( requestMethod ) {
- requestMethod.apply( element );
- }
- }
- /**
- * Enters the paused mode which fades everything on screen to
- * black.
- */
- function pause() {
- dom.wrapper.classList.add( 'paused' );
- }
- /**
- * Exits from the paused mode.
- */
- function resume() {
- dom.wrapper.classList.remove( 'paused' );
- }
- /**
- * Toggles the paused mode on and off.
- */
- function togglePause() {
- if( isPaused() ) {
- resume();
- }
- else {
- pause();
- }
- }
- /**
- * Checks if we are currently in the paused mode.
- */
- function isPaused() {
- return dom.wrapper.classList.contains( 'paused' );
- }
-
- /**
- * Steps from the current point in the presentation to the
- * slide which matches the specified horizontal and vertical
- * indices.
- *
- * @param {int} h Horizontal index of the target slide
- * @param {int} v Vertical index of the target slide
- */
- function slide( h, v ) {
- // Remember where we were at before
- previousSlide = currentSlide;
- // Remember the state before this slide
- var stateBefore = state.concat();
- // Reset the state array
- state.length = 0;
- var indexhBefore = indexh,
- indexvBefore = indexv;
- // Activate and transition to the new slide
- indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
- indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
- // Apply the new state
- stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
- // Check if this state existed on the previous slide. If it
- // did, we will avoid adding it repeatedly.
- for( var j = 0; j < stateBefore.length; j++ ) {
- if( stateBefore[j] === state[i] ) {
- stateBefore.splice( j, 1 );
- continue stateLoop;
- }
- }
- document.documentElement.classList.add( state[i] );
- // Dispatch custom event matching the state's name
- dispatchEvent( state[i] );
- }
- // Clean up the remaints of the previous state
- while( stateBefore.length ) {
- document.documentElement.classList.remove( stateBefore.pop() );
- }
- // Update progress if enabled
- if( config.progress && dom.progress ) {
- dom.progressbar.style.width = ( indexh / ( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length - 1 ) ) * window.innerWidth + 'px';
- }
- // If the overview is active, re-activate it to update positions
- if( isOverviewActive() ) {
- activateOverview();
- }
- updateControls();
-
- // Update the URL hash after a delay since updating it mid-transition
- // is likely to cause visual lag
- clearTimeout( writeURLTimeout );
- writeURLTimeout = setTimeout( writeURL, 1500 );
- // Query all horizontal slides in the deck
- var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
- // Find the current horizontal slide and any possible vertical slides
- // within it
- var currentHorizontalSlide = horizontalSlides[ indexh ],
- currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
- // Store references to the previous and current slides
- currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
- // Dispatch an event if the slide changed
- if( indexh !== indexhBefore || indexv !== indexvBefore ) {
- dispatchEvent( 'slidechanged', {
- 'indexh': indexh,
- 'indexv': indexv,
- 'previousSlide': previousSlide,
- 'currentSlide': currentSlide
- } );
- }
- else {
- // Ensure that the previous slide is never the same as the current
- previousSlide = null;
- }
- // Solves an edge case where the previous slide maintains the
- // 'present' class when navigating between adjacent vertical
- // stacks
- if( previousSlide ) {
- previousSlide.classList.remove( 'present' );
- }
- }
- /**
- * Updates one dimension of slides by showing the slide
- * with the specified index.
- *
- * @param {String} selector A CSS selector that will fetch
- * the group of slides we are working with
- * @param {Number} index The index of the slide that should be
- * shown
- *
- * @return {Number} The index of the slide that is now shown,
- * might differ from the passed in index if it was out of
- * bounds.
- */
- function updateSlides( selector, index ) {
- // Select all slides and convert the NodeList result to
- // an array
- var slides = Array.prototype.slice.call( document.querySelectorAll( selector ) ),
- slidesLength = slides.length;
-
- if( slidesLength ) {
- // Should the index loop?
- if( config.loop ) {
- index %= slidesLength;
- if( index < 0 ) {
- index = slidesLength + index;
- }
- }
-
- // Enforce max and minimum index bounds
- index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
-
- for( var i = 0; i < slidesLength; i++ ) {
- var element = slides[i];
- // Optimization; hide all slides that are three or more steps
- // away from the present slide
- if( isOverviewActive() === false ) {
- // The distance loops so that it measures 1 between the first
- // and last slides
- var distance = Math.abs( ( index - i ) % ( slidesLength - 3 ) ) || 0;
- element.style.display = distance > 3 ? 'none' : 'block';
- }
- slides[i].classList.remove( 'past' );
- slides[i].classList.remove( 'present' );
- slides[i].classList.remove( 'future' );
- if( i < index ) {
- // Any element previous to index is given the 'past' class
- slides[i].classList.add( 'past' );
- }
- else if( i > index ) {
- // Any element subsequent to index is given the 'future' class
- slides[i].classList.add( 'future' );
- }
- // If this element contains vertical slides
- if( element.querySelector( 'section' ) ) {
- slides[i].classList.add( 'stack' );
- }
- }
- // Mark the current slide as present
- slides[index].classList.add( 'present' );
- // If this slide has a state associated with it, add it
- // onto the current state of the deck
- var slideState = slides[index].getAttribute( 'data-state' );
- if( slideState ) {
- state = state.concat( slideState.split( ' ' ) );
- }
- // If this slide has a data-autoslide attribtue associated use this as
- // autoSlide value otherwise use the global configured time
- var slideAutoSlide = slides[index].getAttribute( 'data-autoslide' );
- if( slideAutoSlide ) {
- autoSlide = parseInt( slideAutoSlide );
- } else {
- autoSlide = config.autoSlide
- }
- }
- else {
- // Since there are no slides we can't be anywhere beyond the
- // zeroth index
- index = 0;
- }
-
- return index;
-
- }
- /**
- * Updates the state and link pointers of the controls.
- */
- function updateControls() {
- if ( config.controls && dom.controls ) {
-
- var routes = availableRoutes();
- // Remove the 'enabled' class from all directions
- [ dom.controlsLeft, dom.controlsRight, dom.controlsUp, dom.controlsDown ].forEach( function( node ) {
- node.classList.remove( 'enabled' );
- } );
- // Add the 'enabled' class to the available routes
- if( routes.left ) dom.controlsLeft.classList.add( 'enabled' );
- if( routes.right ) dom.controlsRight.classList.add( 'enabled' );
- if( routes.up ) dom.controlsUp.classList.add( 'enabled' );
- if( routes.down ) dom.controlsDown.classList.add( 'enabled' );
- }
- }
- /**
- * Determine what available routes there are for navigation.
- *
- * @return {Object} containing four booleans: left/right/up/down
- */
- function availableRoutes() {
- var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
- verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
- return {
- left: indexh > 0,
- right: indexh < horizontalSlides.length - 1,
- up: indexv > 0,
- down: indexv < verticalSlides.length - 1
- };
- }
-
- /**
- * Reads the current URL (hash) and navigates accordingly.
- */
- function readURL() {
- var hash = window.location.hash;
- // Attempt to parse the hash as either an index or name
- var bits = hash.slice( 2 ).split( '/' ),
- name = hash.replace( /#|\//gi, '' );
- // If the first bit is invalid and there is a name we can
- // assume that this is a named link
- if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
- // Find the slide with the specified name
- var element = document.querySelector( '#' + name );
- if( element ) {
- // Find the position of the named slide and navigate to it
- var indices = Reveal.getIndices( element );
- slide( indices.h, indices.v );
- }
- // If the slide doesn't exist, navigate to the current slide
- else {
- slide( indexh, indexv );
- }
- }
- else {
- // Read the index components of the hash
- var h = parseInt( bits[0], 10 ) || 0,
- v = parseInt( bits[1], 10 ) || 0;
- slide( h, v );
- }
- }
-
- /**
- * Updates the page URL (hash) to reflect the current
- * state.
- */
- function writeURL() {
- if( config.history ) {
- var url = '/';
-
- // Only include the minimum possible number of components in
- // the URL
- if( indexh > 0 || indexv > 0 ) url += indexh;
- if( indexv > 0 ) url += '/' + indexv;
-
- window.location.hash = url;
- }
- }
- /**
- * Retrieves the h/v location of the current, or specified,
- * slide.
- *
- * @param {HTMLElement} slide If specified, the returned
- * index will be for this slide rather than the currently
- * active one
- *
- * @return {Object} { h: <int>, v: <int> }
- */
- function getIndices( slide ) {
- // By default, return the current indices
- var h = indexh,
- v = indexv;
- // If a slide is specified, return the indices of that slide
- if( slide ) {
- var isVertical = !!slide.parentNode.nodeName.match( /section/gi );
- var slideh = isVertical ? slide.parentNode : slide;
- // Select all horizontal slides
- var horizontalSlides = Array.prototype.slice.call( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
- // Now that we know which the horizontal slide is, get its index
- h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
- // If this is a vertical slide, grab the vertical index
- if( isVertical ) {
- v = Math.max( Array.prototype.slice.call( slide.parentNode.children ).indexOf( slide ), 0 );
- }
- }
- return { h: h, v: v };
- }
- /**
- * Navigate to the next slide fragment.
- *
- * @return {Boolean} true if there was a next fragment,
- * false otherwise
- */
- function nextFragment() {
- // Vertical slides:
- if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
- var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
- if( verticalFragments.length ) {
- verticalFragments[0].classList.add( 'visible' );
- // Notify subscribers of the change
- dispatchEvent( 'fragmentshown', { fragment: verticalFragments[0] } );
- return true;
- }
- }
- // Horizontal slides:
- else {
- var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
- if( horizontalFragments.length ) {
- horizontalFragments[0].classList.add( 'visible' );
- // Notify subscribers of the change
- dispatchEvent( 'fragmentshown', { fragment: horizontalFragments[0] } );
- return true;
- }
- }
- return false;
- }
- /**
- * Navigate to the previous slide fragment.
- *
- * @return {Boolean} true if there was a previous fragment,
- * false otherwise
- */
- function previousFragment() {
- // Vertical slides:
- if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
- var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment.visible' );
- if( verticalFragments.length ) {
- verticalFragments[ verticalFragments.length - 1 ].classList.remove( 'visible' );
- // Notify subscribers of the change
- dispatchEvent( 'fragmenthidden', { fragment: verticalFragments[ verticalFragments.length - 1 ] } );
- return true;
- }
- }
- // Horizontal slides:
- else {
- var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment.visible' );
- if( horizontalFragments.length ) {
- horizontalFragments[ horizontalFragments.length - 1 ].classList.remove( 'visible' );
- // Notify subscribers of the change
- dispatchEvent( 'fragmenthidden', { fragment: horizontalFragments[ horizontalFragments.length - 1 ] } );
- return true;
- }
- }
-
- return false;
- }
- /**
- * Cues a new automated slide if enabled in the config.
- */
- function cueAutoSlide() {
- clearTimeout( autoSlideTimeout );
- // Cue the next auto-slide if enabled
- if( autoSlide ) {
- autoSlideTimeout = setTimeout( navigateNext, autoSlide );
- }
- }
-
- function navigateLeft() {
- // Prioritize hiding fragments
- if( isOverviewActive() || previousFragment() === false ) {
- slide( indexh - 1, 0 );
- }
- }
- function navigateRight() {
- // Prioritize revealing fragments
- if( isOverviewActive() || nextFragment() === false ) {
- slide( indexh + 1, 0 );
- }
- }
- function navigateUp() {
- // Prioritize hiding fragments
- if( isOverviewActive() || previousFragment() === false ) {
- slide( indexh, indexv - 1 );
- }
- }
- function navigateDown() {
- // Prioritize revealing fragments
- if( isOverviewActive() || nextFragment() === false ) {
- slide( indexh, indexv + 1 );
- }
- }
- /**
- * Navigates backwards, prioritized in the following order:
- * 1) Previous fragment
- * 2) Previous vertical slide
- * 3) Previous horizontal slide
- */
- function navigatePrev() {
- // Prioritize revealing fragments
- if( previousFragment() === false ) {
- if( availableRoutes().up ) {
- navigateUp();
- }
- else {
- // Fetch the previous horizontal slide, if there is one
- var previousSlide = document.querySelector( '.reveal .slides>section.past:nth-child(' + indexh + ')' );
- if( previousSlide ) {
- indexv = ( previousSlide.querySelectorAll('section').length + 1 ) || 0;
- indexh --;
- slide();
- }
- }
- }
- }
- /**
- * Same as #navigatePrev() but navigates forwards.
- */
- function navigateNext() {
- // Prioritize revealing fragments
- if( nextFragment() === false ) {
- availableRoutes().down ? navigateDown() : navigateRight();
- }
- // If auto-sliding is enabled we need to cue up
- // another timeout
- cueAutoSlide();
- }
- // --------------------------------------------------------------------//
- // ----------------------------- EVENTS -------------------------------//
- // --------------------------------------------------------------------//
- /**
- * Handler for the document level 'keydown' event.
- *
- * @param {Object} event
- */
- function onDocumentKeyDown( event ) {
- // Disregard the event if the target is editable or a
- // modifier is present
- if ( document.querySelector( ':focus' ) !== null || event.shiftKey || event.altKey || event.ctrlKey || event.metaKey ) return;
- var triggered = true;
- switch( event.keyCode ) {
- // p, page up
- case 80: case 33: navigatePrev(); break;
- // n, page down
- case 78: case 34: navigateNext(); break;
- // h, left
- case 72: case 37: navigateLeft(); break;
- // l, right
- case 76: case 39: navigateRight(); break;
- // k, up
- case 75: case 38: navigateUp(); break;
- // j, down
- case 74: case 40: navigateDown(); break;
- // home
- case 36: slide( 0 ); break;
- // end
- case 35: slide( Number.MAX_VALUE ); break;
- // space
- case 32: isOverviewActive() ? deactivateOverview() : navigateNext(); break;
- // return
- case 13: isOverviewActive() ? deactivateOverview() : triggered = false; break;
- // b, period
- case 66: case 190: togglePause(); break;
- // f
- case 70: enterFullscreen(); break;
- default:
- triggered = false;
- }
- // If the input resulted in a triggered action we should prevent
- // the browsers default behavior
- if( triggered ) {
- event.preventDefault();
- }
- else if ( event.keyCode === 27 && supports3DTransforms ) {
- toggleOverview();
-
- event.preventDefault();
- }
- // If auto-sliding is enabled we need to cue up
- // another timeout
- cueAutoSlide();
- }
- /**
- * Handler for the document level 'touchstart' event,
- * enables support for swipe and pinch gestures.
- */
- function onDocumentTouchStart( event ) {
- touch.startX = event.touches[0].clientX;
- touch.startY = event.touches[0].clientY;
- touch.startCount = event.touches.length;
- // If there's two touches we need to memorize the distance
- // between those two points to detect pinching
- if( event.touches.length === 2 && config.overview ) {
- touch.startSpan = distanceBetween( {
- x: event.touches[1].clientX,
- y: event.touches[1].clientY
- }, {
- x: touch.startX,
- y: touch.startY
- } );
- }
- }
-
- /**
- * Handler for the document level 'touchmove' event.
- */
- function onDocumentTouchMove( event ) {
- // Each touch should only trigger one action
- if( !touch.handled ) {
- var currentX = event.touches[0].clientX;
- var currentY = event.touches[0].clientY;
- // If the touch started off with two points and still has
- // two active touches; test for the pinch gesture
- if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
- // The current distance in pixels between the two touch points
- var currentSpan = distanceBetween( {
- x: event.touches[1].clientX,
- y: event.touches[1].clientY
- }, {
- x: touch.startX,
- y: touch.startY
- } );
- // If the span is larger than the desire amount we've got
- // ourselves a pinch
- if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
- touch.handled = true;
- if( currentSpan < touch.startSpan ) {
- activateOverview();
- }
- else {
- deactivateOverview();
- }
- }
- event.preventDefault();
- }
- // There was only one touch point, look for a swipe
- else if( event.touches.length === 1 && touch.startCount !== 2 ) {
- var deltaX = currentX - touch.startX,
- deltaY = currentY - touch.startY;
- if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
- touch.handled = true;
- navigateLeft();
- }
- else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
- touch.handled = true;
- navigateRight();
- }
- else if( deltaY > touch.threshold ) {
- touch.handled = true;
- navigateUp();
- }
- else if( deltaY < -touch.threshold ) {
- touch.handled = true;
- navigateDown();
- }
- event.preventDefault();
- }
- }
- // There's a bug with swiping on some Android devices unless
- // the default action is always prevented
- else if( navigator.userAgent.match( /android/gi ) ) {
- event.preventDefault();
- }
- }
- /**
- * Handler for the document level 'touchend' event.
- */
- function onDocumentTouchEnd( event ) {
- touch.handled = false;
- }
- /**
- * Handles mouse wheel scrolling, throttled to avoid
- * skipping multiple slides.
- */
- function onDocumentMouseScroll( event ){
- clearTimeout( mouseWheelTimeout );
- mouseWheelTimeout = setTimeout( function() {
- var delta = event.detail || -event.wheelDelta;
- if( delta > 0 ) {
- navigateNext();
- }
- else {
- navigatePrev();
- }
- }, 100 );
- }
-
- /**
- * Handler for the window level 'hashchange' event.
- *
- * @param {Object} event
- */
- function onWindowHashChange( event ) {
- readURL();
- }
- /**
- * Invoked when a slide is and we're in the overview.
- */
- function onOverviewSlideClicked( event ) {
- // TODO There's a bug here where the event listeners are not
- // removed after deactivating the overview.
- if( isOverviewActive() ) {
- event.preventDefault();
- deactivateOverview();
- indexh = this.getAttribute( 'data-index-h' );
- indexv = this.getAttribute( 'data-index-v' );
- slide();
- }
- }
-
- // --------------------------------------------------------------------//
- // ------------------------------- API --------------------------------//
- // --------------------------------------------------------------------//
- return {
- initialize: initialize,
-
- // Navigation methods
- slide: slide,
- left: navigateLeft,
- right: navigateRight,
- up: navigateUp,
- down: navigateDown,
- prev: navigatePrev,
- next: navigateNext,
- // Deprecated aliases
- navigateTo: slide,
- navigateLeft: navigateLeft,
- navigateRight: navigateRight,
- navigateUp: navigateUp,
- navigateDown: navigateDown,
- navigatePrev: navigatePrev,
- navigateNext: navigateNext,
- // Toggles the overview mode on/off
- toggleOverview: toggleOverview,
- // Adds or removes all internal event listeners (such as keyboard)
- addEventListeners: addEventListeners,
- removeEventListeners: removeEventListeners,
- // Returns the indices of the current, or specified, slide
- getIndices: getIndices,
- // Returns the previous slide element, may be null
- getPreviousSlide: function() {
- return previousSlide;
- },
- // Returns the current slide element
- getCurrentSlide: function() {
- return currentSlide;
- },
- // Helper method, retrieves query string as a key/value hash
- getQueryHash: function() {
- var query = {};
- location.search.replace( /[A-Z0-9]+?=(\w*)/gi, function(a) {
- query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
- } );
- return query;
- },
- // Forward event binding to the reveal DOM element
- addEventListener: function( type, listener, useCapture ) {
- if( 'addEventListener' in window ) {
- ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
- }
- },
- removeEventListener: function( type, listener, useCapture ) {
- if( 'addEventListener' in window ) {
- ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
- }
- }
- };
-
- })();
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