952 lines
27 KiB
JavaScript
952 lines
27 KiB
JavaScript
/*!
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* reveal.js 1.4
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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) 2012 Hakim El Hattab, http://hakim.se
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*/
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var Reveal = (function(){
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var HORIZONTAL_SLIDES_SELECTOR = '.reveal .slides>section',
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VERTICAL_SLIDES_SELECTOR = '.reveal .slides>section.present>section',
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IS_TOUCH_DEVICE = !!( 'ontouchstart' in window ),
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// The horizontal and verical index of the currently active slide
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indexh = 0,
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indexv = 0,
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// Configurations options, can be overridden at initialization time
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config = {
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controls: true,
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progress: false,
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history: false,
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loop: false,
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mouseWheel: true,
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rollingLinks: true,
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transition: 'default',
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theme: 'default'
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},
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// Slides may hold a data-state attribute which we pick up and apply
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// as a class to the body. This list contains the combined state of
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// all current slides.
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state = [],
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// Cached references to DOM elements
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dom = {},
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// Detect support for CSS 3D transforms
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supports3DTransforms = document.body.style['WebkitPerspective'] !== undefined ||
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document.body.style['MozPerspective'] !== undefined ||
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document.body.style['msPerspective'] !== undefined ||
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document.body.style['OPerspective'] !== undefined ||
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document.body.style['perspective'] !== undefined,
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supports2DTransforms = document.body.style['WebkitTransform'] !== undefined ||
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document.body.style['MozTransform'] !== undefined ||
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document.body.style['msTransform'] !== undefined ||
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document.body.style['OTransform'] !== undefined ||
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document.body.style['transform'] !== undefined,
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// Detect support for elem.classList
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supportsClassList = !!document.body.classList;
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// Throttles mouse wheel navigation
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mouseWheelTimeout = 0,
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// Delays updates to the URL due to a Chrome thumbnailer bug
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writeURLTimeout = 0,
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// Holds information about the currently ongoing touch input
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touch = {
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startX: 0,
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startY: 0,
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startSpan: 0,
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startCount: 0,
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handled: false,
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threshold: 40
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};
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/**
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* Starts up the slideshow by applying configuration
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* options and binding various events.
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*/
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function initialize( options ) {
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if( ( !supports2DTransforms && !supports3DTransforms ) || !supportsClassList ) {
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document.body.setAttribute( 'class', 'no-transforms' );
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// If the browser doesn't support core features we won't be
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// using JavaScript to control the presentation
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return;
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}
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// Cache references to DOM elements
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dom.wrapper = document.querySelector( '.reveal' );
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dom.progress = document.querySelector( '.reveal .progress' );
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dom.progressbar = document.querySelector( '.reveal .progress span' );
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if ( config.controls ) {
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dom.controls = document.querySelector( '.reveal .controls' );
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dom.controlsLeft = document.querySelector( '.reveal .controls .left' );
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dom.controlsRight = document.querySelector( '.reveal .controls .right' );
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dom.controlsUp = document.querySelector( '.reveal .controls .up' );
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dom.controlsDown = document.querySelector( '.reveal .controls .down' );
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}
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addEventListeners();
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// Copy options over to our config object
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extend( config, options );
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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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// Set up hiding of the browser address bar
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if( navigator.userAgent.match( /(iphone|ipod|android)/i ) ) {
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// Give the page some scrollable overflow
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document.documentElement.style.overflow = 'scroll';
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document.body.style.height = '120%';
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// Events that should trigger the address bar to hide
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window.addEventListener( 'load', removeAddressBar, false );
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window.addEventListener( 'orientationchange', removeAddressBar, false );
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}
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}
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function configure() {
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// Fall back on the 2D transform theme 'linear'
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if( supports3DTransforms === false ) {
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config.transition = 'linear';
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}
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if( config.controls && dom.controls ) {
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dom.controls.style.display = 'block';
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}
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if( config.progress ) {
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dom.progress.style.display = 'block';
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}
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if( config.transition !== 'default' ) {
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dom.wrapper.classList.add( config.transition );
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}
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if( config.theme !== 'default' ) {
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document.documentElement.classList.add( 'theme-' + config.theme );
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}
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if( config.mouseWheel ) {
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document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
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document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
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}
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if( config.rollingLinks ) {
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// Add some 3D magic to our anchors
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linkify();
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}
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}
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function addEventListeners() {
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document.addEventListener( 'keydown', onDocumentKeyDown, false );
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document.addEventListener( 'touchstart', onDocumentTouchStart, false );
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document.addEventListener( 'touchmove', onDocumentTouchMove, false );
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document.addEventListener( 'touchend', onDocumentTouchEnd, false );
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window.addEventListener( 'hashchange', onWindowHashChange, false );
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if ( config.controls && dom.controls ) {
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dom.controlsLeft.addEventListener( 'click', preventAndForward( navigateLeft ), false );
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dom.controlsRight.addEventListener( 'click', preventAndForward( navigateRight ), false );
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dom.controlsUp.addEventListener( 'click', preventAndForward( navigateUp ), false );
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dom.controlsDown.addEventListener( 'click', preventAndForward( navigateDown ), false );
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}
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}
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function removeEventListeners() {
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document.removeEventListener( 'keydown', onDocumentKeyDown, false );
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document.removeEventListener( 'touchstart', onDocumentTouchStart, false );
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document.removeEventListener( 'touchmove', onDocumentTouchMove, false );
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document.removeEventListener( 'touchend', onDocumentTouchEnd, false );
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window.removeEventListener( 'hashchange', onWindowHashChange, false );
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if ( config.controls && dom.controls ) {
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dom.controlsLeft.removeEventListener( 'click', preventAndForward( navigateLeft ), false );
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dom.controlsRight.removeEventListener( 'click', preventAndForward( navigateRight ), false );
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dom.controlsUp.removeEventListener( 'click', preventAndForward( navigateUp ), false );
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dom.controlsDown.removeEventListener( 'click', preventAndForward( navigateDown ), false );
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}
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}
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/**
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* Extend object a with the properties of object b.
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* If there's a conflict, object b takes precedence.
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*/
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function extend( a, b ) {
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for( var i in b ) {
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a[ i ] = b[ i ];
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}
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}
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/**
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* Measures the distance in pixels between point a
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* and point b.
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*
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* @param {Object} a point with x/y properties
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* @param {Object} b point with x/y properties
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*/
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function distanceBetween( a, b ) {
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var dx = a.x - b.x,
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dy = a.y - b.y;
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return Math.sqrt( dx*dx + dy*dy );
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}
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/**
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* Prevents an events defaults behavior calls the
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* specified delegate.
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*
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* @param {Function} delegate The method to call
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* after the wrapper has been executed
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*/
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function preventAndForward( delegate ) {
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return function( event ) {
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event.preventDefault();
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delegate.call();
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}
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}
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/**
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* Causes the address bar to hide on mobile devices,
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* more vertical space ftw.
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*/
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function removeAddressBar() {
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setTimeout( function() {
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window.scrollTo( 0, 1 );
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}, 0 );
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}
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/**
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* Handler for the document level 'keydown' event.
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*
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* @param {Object} event
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*/
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function onDocumentKeyDown( event ) {
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// FFT: Use document.querySelector( ':focus' ) === null
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// instead of checking contentEditable?
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// Disregard the event if the target is editable or a
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// modifier is present
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if ( event.target.contentEditable != 'inherit' || event.shiftKey || event.altKey || event.ctrlKey || event.metaKey ) return;
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var triggered = false;
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switch( event.keyCode ) {
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// p, page up
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case 80: case 33: navigatePrev(); triggered = true; break;
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// n, page down
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case 78: case 34: navigateNext(); triggered = true; break;
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// h, left
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case 72: case 37: navigateLeft(); triggered = true; break;
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// l, right
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case 76: case 39: navigateRight(); triggered = true; break;
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// k, up
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case 75: case 38: navigateUp(); triggered = true; break;
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// j, down
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case 74: case 40: navigateDown(); triggered = true; break;
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// home
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case 36: navigateTo( 0 ); triggered = true; break;
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// end
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case 35: navigateTo( Number.MAX_VALUE ); triggered = true; break;
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// space
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case 32: overviewIsActive() ? deactivateOverview() : navigateNext(); triggered = true; break;
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// return
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case 13: if( overviewIsActive() ) { deactivateOverview(); triggered = true; } break;
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}
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if( triggered ) {
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event.preventDefault();
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}
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else if ( event.keyCode === 27 && supports3DTransforms ) {
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if( overviewIsActive() ) {
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deactivateOverview();
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}
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else {
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activateOverview();
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}
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event.preventDefault();
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}
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}
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/**
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* Handler for the document level 'touchstart' event,
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* enables support for swipe and pinch gestures.
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*/
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function onDocumentTouchStart( event ) {
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touch.startX = event.touches[0].clientX;
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touch.startY = event.touches[0].clientY;
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touch.startCount = event.touches.length;
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// If there's two touches we need to memorize the distance
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// between those two points to detect pinching
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if( event.touches.length === 2 ) {
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touch.startSpan = distanceBetween( {
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x: event.touches[1].clientX,
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y: event.touches[1].clientY
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}, {
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x: touch.startX,
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y: touch.startY
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} );
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}
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}
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/**
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* Handler for the document level 'touchmove' event.
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*/
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function onDocumentTouchMove( event ) {
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// Each touch should only trigger one action
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if( !touch.handled ) {
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var currentX = event.touches[0].clientX;
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var currentY = event.touches[0].clientY;
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// If the touch started off with two points and still has
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// two active touches; test for the pinch gesture
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if( event.touches.length === 2 && touch.startCount === 2 ) {
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// The current distance in pixels between the two touch points
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var currentSpan = distanceBetween( {
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x: event.touches[1].clientX,
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y: event.touches[1].clientY
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}, {
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x: touch.startX,
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y: touch.startY
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} );
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// If the span is larger than the desire amount we've got
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// ourselves a pinch
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if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
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touch.handled = true;
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if( currentSpan < touch.startSpan ) {
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activateOverview();
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}
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else {
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deactivateOverview();
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}
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}
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}
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// There was only one touch point, look for a swipe
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else if( event.touches.length === 1 ) {
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var deltaX = currentX - touch.startX,
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deltaY = currentY - touch.startY;
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if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
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touch.handled = true;
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navigateLeft();
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}
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else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
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touch.handled = true;
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navigateRight();
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}
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else if( deltaY > touch.threshold ) {
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touch.handled = true;
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navigateUp();
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}
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else if( deltaY < -touch.threshold ) {
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touch.handled = true;
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navigateDown();
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}
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}
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event.preventDefault();
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}
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}
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/**
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* Handler for the document level 'touchend' event.
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*/
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function onDocumentTouchEnd( event ) {
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touch.handled = false;
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}
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/**
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* Handles mouse wheel scrolling, throttled to avoid
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* skipping multiple slides.
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*/
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function onDocumentMouseScroll( event ){
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clearTimeout( mouseWheelTimeout );
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mouseWheelTimeout = setTimeout( function() {
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var delta = event.detail || -event.wheelDelta;
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if( delta > 0 ) {
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navigateNext();
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}
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else {
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navigatePrev();
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}
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}, 100 );
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}
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/**
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* Handler for the window level 'hashchange' event.
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*
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* @param {Object} event
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*/
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function onWindowHashChange( event ) {
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readURL();
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}
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/**
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* Wrap all links in 3D goodness.
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*/
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function linkify() {
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if( supports3DTransforms ) {
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var nodes = document.querySelectorAll( '.reveal .slides section a:not(.image)' );
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for( var i = 0, len = nodes.length; i < len; i++ ) {
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var node = nodes[i];
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if( node.textContent && !node.querySelector( 'img' ) && ( !node.className || !node.classList.contains( node, 'roll' ) ) ) {
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node.classList.add( 'roll' );
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node.innerHTML = '<span data-title="'+ node.text +'">' + node.innerHTML + '</span>';
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}
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};
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}
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}
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/**
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* Displays the overview of slides (quick nav) by
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* scaling down and arranging all slide elements.
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*
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* Experimental feature, might be dropped if perf
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* can't be improved.
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*/
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function activateOverview() {
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dom.wrapper.classList.add( 'overview' );
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var horizontalSlides = Array.prototype.slice.call( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
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for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
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var hslide = horizontalSlides[i],
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htransform = 'translateZ(-2500px) translate(' + ( ( i - indexh ) * 105 ) + '%, 0%)';
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hslide.setAttribute( 'data-index-h', i );
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hslide.style.display = 'block';
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hslide.style.WebkitTransform = htransform;
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hslide.style.MozTransform = htransform;
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hslide.style.msTransform = htransform;
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hslide.style.OTransform = htransform;
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hslide.style.transform = htransform;
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if( !hslide.classList.contains( 'stack' ) ) {
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// Navigate to this slide on click
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hslide.addEventListener( 'click', onOverviewSlideClicked, true );
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}
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var verticalSlides = Array.prototype.slice.call( hslide.querySelectorAll( 'section' ) );
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for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
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var vslide = verticalSlides[j],
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vtransform = 'translate(0%, ' + ( ( j - indexv ) * 105 ) + '%)';
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vslide.setAttribute( 'data-index-h', i );
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vslide.setAttribute( 'data-index-v', j );
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vslide.style.display = 'block';
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vslide.style.WebkitTransform = vtransform;
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vslide.style.MozTransform = vtransform;
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vslide.style.msTransform = vtransform;
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vslide.style.OTransform = vtransform;
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vslide.style.transform = vtransform;
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// Navigate to this slide on click
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vslide.addEventListener( 'click', onOverviewSlideClicked, true );
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}
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}
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}
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/**
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* Exits the slide overview and enters the currently
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* active slide.
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*/
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function deactivateOverview() {
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dom.wrapper.classList.remove( 'overview' );
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var slides = Array.prototype.slice.call( document.querySelectorAll( '.reveal .slides section' ) );
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for( var i = 0, len = slides.length; i < len; i++ ) {
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var element = slides[i];
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// Resets all transforms to use the external styles
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element.style.WebkitTransform = '';
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element.style.MozTransform = '';
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element.style.msTransform = '';
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element.style.OTransform = '';
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element.style.transform = '';
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element.removeEventListener( 'click', onOverviewSlideClicked );
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}
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slide();
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}
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/**
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* Checks if the overview is currently active.
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*
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* @return {Boolean} true if the overview is active,
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* false otherwise
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*/
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function overviewIsActive() {
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return dom.wrapper.classList.contains( 'overview' );
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}
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/**
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* Invoked when a slide is and we're in the overview.
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*/
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function onOverviewSlideClicked( event ) {
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// TODO There's a bug here where the event listeners are not
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// removed after deactivating the overview.
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if( overviewIsActive() ) {
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event.preventDefault();
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deactivateOverview();
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indexh = this.getAttribute( 'data-index-h' );
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indexv = this.getAttribute( 'data-index-v' );
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slide();
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}
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}
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/**
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* Updates one dimension of slides by showing the slide
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* with the specified index.
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*
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* @param {String} selector A CSS selector that will fetch
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* the group of slides we are working with
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* @param {Number} index The index of the slide that should be
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* shown
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*
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* @return {Number} The index of the slide that is now shown,
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* might differ from the passed in index if it was out of
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* bounds.
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*/
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function updateSlides( selector, index ) {
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// Select all slides and convert the NodeList result to
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// an array
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var slides = Array.prototype.slice.call( document.querySelectorAll( selector ) ),
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slidesLength = slides.length;
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if( slidesLength ) {
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// Should the index loop?
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if( config.loop ) {
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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 slide = slides[i];
|
|
|
|
// Optimization; hide all slides that are three or more steps
|
|
// away from the present slide
|
|
if( overviewIsActive() === false ) {
|
|
// The distance loops so that it measures 1 between the first
|
|
// and last slides
|
|
var distance = Math.abs( ( index - i ) % ( slidesLength - 3 ) ) || 0;
|
|
|
|
slide.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( slide.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( ' ' ) );
|
|
}
|
|
}
|
|
else {
|
|
// Since there are no slides we can't be anywhere beyond the
|
|
// zeroth index
|
|
index = 0;
|
|
}
|
|
|
|
return index;
|
|
|
|
}
|
|
|
|
/**
|
|
* Updates the visual slides to represent the currently
|
|
* set indices.
|
|
*/
|
|
function slide( h, v ) {
|
|
// 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.progressbar.style.width = ( indexh / ( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length - 1 ) ) * window.innerWidth + 'px';
|
|
}
|
|
|
|
// Close the overview if it's active
|
|
if( overviewIsActive() ) {
|
|
activateOverview();
|
|
}
|
|
|
|
updateControls();
|
|
|
|
clearTimeout( writeURLTimeout );
|
|
writeURLTimeout = setTimeout( writeURL, 1500 );
|
|
|
|
// Only fire if the slide index is different from before
|
|
if( indexh !== indexhBefore || indexv !== indexvBefore ) {
|
|
// Query all horizontal slides in the deck
|
|
var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
|
|
|
|
// Find the previous and current horizontal slides
|
|
var previousHorizontalSlide = horizontalSlides[ indexhBefore ],
|
|
currentHorizontalSlide = horizontalSlides[ indexh ];
|
|
|
|
// Query all vertical slides inside of the previous and current horizontal slides
|
|
var previousVerticalSlides = previousHorizontalSlide.querySelectorAll( 'section' );
|
|
currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
|
|
|
|
// Dispatch an event notifying observers of the change in slide
|
|
dispatchEvent( 'slidechanged', {
|
|
// Include the current indices in the event
|
|
'indexh': indexh,
|
|
'indexv': indexv,
|
|
|
|
// Passes direct references to the slide HTML elements, attempts to find
|
|
// a vertical slide and falls back on the horizontal parent
|
|
'previousSlide': previousVerticalSlides[ indexvBefore ] || previousHorizontalSlide,
|
|
'currentSlide': currentVerticalSlides[ indexv ] || currentHorizontalSlide
|
|
} );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Updates the state and link pointers of the controls.
|
|
*/
|
|
function updateControls() {
|
|
if ( !config.controls || !dom.controls ) {
|
|
return;
|
|
}
|
|
|
|
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' );
|
|
} )
|
|
|
|
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 );
|
|
var 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() {
|
|
// Break the hash down to separate components
|
|
var bits = window.location.hash.slice(2).split('/');
|
|
|
|
// Read the index components of the hash
|
|
indexh = parseInt( bits[0] ) || 0 ;
|
|
indexv = parseInt( bits[1] ) || 0 ;
|
|
|
|
navigateTo( indexh, indexv );
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 );
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
/**
|
|
* Triggers a navigation to the specified indices.
|
|
*
|
|
* @param {Number} h The horizontal index of the slide to show
|
|
* @param {Number} v The vertical index of the slide to show
|
|
*/
|
|
function navigateTo( h, v ) {
|
|
slide( h, v );
|
|
}
|
|
|
|
function navigateLeft() {
|
|
// Prioritize hiding fragments
|
|
if( overviewIsActive() || previousFragment() === false ) {
|
|
slide( indexh - 1, 0 );
|
|
}
|
|
}
|
|
function navigateRight() {
|
|
// Prioritize revealing fragments
|
|
if( overviewIsActive() || nextFragment() === false ) {
|
|
slide( indexh + 1, 0 );
|
|
}
|
|
}
|
|
function navigateUp() {
|
|
// Prioritize hiding fragments
|
|
if( overviewIsActive() || previousFragment() === false ) {
|
|
slide( indexh, indexv - 1 );
|
|
}
|
|
}
|
|
function navigateDown() {
|
|
// Prioritize revealing fragments
|
|
if( overviewIsActive() || 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();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Toggles the slide overview mode on and off.
|
|
*/
|
|
function toggleOverview() {
|
|
if( overviewIsActive() ) {
|
|
deactivateOverview();
|
|
}
|
|
else {
|
|
activateOverview();
|
|
}
|
|
}
|
|
|
|
// Expose some methods publicly
|
|
return {
|
|
initialize: initialize,
|
|
navigateTo: navigateTo,
|
|
navigateLeft: navigateLeft,
|
|
navigateRight: navigateRight,
|
|
navigateUp: navigateUp,
|
|
navigateDown: navigateDown,
|
|
navigatePrev: navigatePrev,
|
|
navigateNext: navigateNext,
|
|
toggleOverview: toggleOverview,
|
|
|
|
addEventListeners: addEventListeners,
|
|
removeEventListeners: removeEventListeners,
|
|
|
|
// Forward event binding to the reveal DOM element
|
|
addEventListener: function( type, listener, useCapture ) {
|
|
( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
|
|
},
|
|
removeEventListener: function( type, listener, useCapture ) {
|
|
( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
|
|
}
|
|
};
|
|
|
|
})();
|
|
|