767 lines
21 KiB
JavaScript
767 lines
21 KiB
JavaScript
/*!
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* reveal.js 1.3
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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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// 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: false,
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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['perspectiveProperty'] !== undefined ||
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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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supports2DTransforms = document.body.style['transformProperty'] !== undefined ||
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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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// 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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/**
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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 ) {
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document.body.setAttribute( 'class', 'no-transforms' );
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// If the browser doesn't support transforms 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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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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// Bind all view events
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document.addEventListener( 'keydown', onDocumentKeyDown, false );
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document.addEventListener( 'touchstart', onDocumentTouchStart, false );
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window.addEventListener( 'hashchange', onWindowHashChange, false );
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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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// Copy options over to our config object
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extend( config, options );
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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 ) {
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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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dom.wrapper.classList.add( 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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// Read the initial hash
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readURL();
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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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* 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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* 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, space
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case 78: case 32: 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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}
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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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*
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* This enables very basic tap interaction for touch
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* devices. Added mainly for performance testing of 3D
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* transforms on iOS but was so happily surprised with
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* how smoothly it runs so I left it in here. Apple +1
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*
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* @param {Object} event
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*/
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function onDocumentTouchStart( event ) {
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// We're only interested in one point taps
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if (event.touches.length === 1) {
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// Never prevent taps on anchors and images
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if( event.target.tagName.toLowerCase() === 'a' || event.target.tagName.toLowerCase() === 'img' ) {
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return;
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}
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event.preventDefault();
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var point = {
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x: event.touches[0].clientX,
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y: event.touches[0].clientY
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};
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// Define the extent of the areas that may be tapped
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// to navigate
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var wt = window.innerWidth * 0.3;
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var ht = window.innerHeight * 0.3;
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if( point.x < wt ) {
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navigateLeft();
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}
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else if( point.x > window.innerWidth - wt ) {
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navigateRight();
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}
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else if( point.y < ht ) {
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navigateUp();
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}
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else if( point.y > window.innerHeight - ht ) {
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navigateDown();
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}
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slide();
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}
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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;
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if( index < 0 ) {
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index = slidesLength + index;
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}
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}
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// Enforce max and minimum index bounds
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index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
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for( var i = 0; i < slidesLength; i++ ) {
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var slide = slides[i];
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// Optimization; hide all slides that are three or more steps
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// away from the present slide
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if( overviewIsActive() === false ) {
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// The distance loops so that it measures 1 between the first
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// and last slides
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var distance = Math.abs( ( index - i ) % ( slidesLength - 3 ) ) || 0;
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slide.style.display = distance > 3 ? 'none' : 'block';
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}
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slides[i].classList.remove( 'past' );
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slides[i].classList.remove( 'present' );
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slides[i].classList.remove( 'future' );
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if( i < index ) {
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// Any element previous to index is given the 'past' class
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slides[i].classList.add( 'past' );
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}
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else if( i > index ) {
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// Any element subsequent to index is given the 'future' class
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slides[i].classList.add( 'future' );
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}
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// If this element contains vertical slides
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if( slide.querySelector( 'section' ) ) {
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slides[i].classList.add( 'stack' );
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}
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}
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// Mark the current slide as present
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slides[index].classList.add( 'present' );
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// If this slide has a state associated with it, add it
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// onto the current state of the deck
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var slideState = slides[index].getAttribute( 'data-state' );
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if( slideState ) {
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state = state.concat( slideState.split( ' ' ) );
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}
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}
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else {
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// Since there are no slides we can't be anywhere beyond the
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// zeroth index
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index = 0;
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}
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return index;
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}
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/**
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* Updates the visual slides to represent the currently
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* set indices.
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*/
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function slide() {
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// Remember the state before this slide
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var stateBefore = state.concat();
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// Reset the state array
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state.length = 0;
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// Activate and transition to the new slide
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indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, indexh );
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indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, indexv );
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// Apply the new state
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stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
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// Check if this state existed on the previous slide. If it
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// did, we will avoid adding it repeatedly.
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for( var j = 0; j < stateBefore.length; j++ ) {
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if( stateBefore[j] === state[i] ) {
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stateBefore.splice( j, 1 );
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continue stateLoop;
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}
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}
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document.documentElement.classList.add( state[i] );
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// Dispatch custom event matching the state's name
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dispatchEvent( state[i] );
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}
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// Clean up the remaints of the previous state
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while( stateBefore.length ) {
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document.documentElement.classList.remove( stateBefore.pop() );
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}
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// Update progress if enabled
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if( config.progress ) {
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dom.progressbar.style.width = ( indexh / ( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length - 1 ) ) * window.innerWidth + 'px';
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}
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// Close the overview if it's active
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if( overviewIsActive() ) {
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activateOverview();
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}
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updateControls();
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clearTimeout( writeURLTimeout );
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writeURLTimeout = setTimeout( writeURL, 1500 );
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// Dispatch an event notifying observers of the change in slide
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dispatchEvent( 'slidechanged', {
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'indexh': indexh,
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'indexv': indexv
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} );
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}
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/**
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* Updates the state and link pointers of the controls.
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*/
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function updateControls() {
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var routes = availableRoutes();
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// Remove the 'enabled' class from all directions
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[ dom.controlsLeft, dom.controlsRight, dom.controlsUp, dom.controlsDown ].forEach( function( node ) {
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node.classList.remove( 'enabled' );
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} )
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if( routes.left ) dom.controlsLeft.classList.add( 'enabled' );
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if( routes.right ) dom.controlsRight.classList.add( 'enabled' );
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if( routes.up ) dom.controlsUp.classList.add( 'enabled' );
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if( routes.down ) dom.controlsDown.classList.add( 'enabled' );
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}
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/**
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* Determine what available routes there are for navigation.
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*
|
|
* @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' );
|
|
return true;
|
|
}
|
|
}
|
|
// Horizontal slides:
|
|
else {
|
|
var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
|
|
if( horizontalFragments.length ) {
|
|
horizontalFragments[0].classList.add( 'visible' );
|
|
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' );
|
|
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' );
|
|
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 ) {
|
|
indexh = h === undefined ? indexh : h;
|
|
indexv = v === undefined ? indexv : v;
|
|
|
|
slide();
|
|
}
|
|
|
|
function navigateLeft() {
|
|
// Prioritize hiding fragments
|
|
if( overviewIsActive() || previousFragment() === false ) {
|
|
indexh --;
|
|
indexv = 0;
|
|
slide();
|
|
}
|
|
}
|
|
function navigateRight() {
|
|
// Prioritize revealing fragments
|
|
if( overviewIsActive() || nextFragment() === false ) {
|
|
indexh ++;
|
|
indexv = 0;
|
|
slide();
|
|
}
|
|
}
|
|
function navigateUp() {
|
|
// Prioritize hiding fragments
|
|
if( overviewIsActive() || previousFragment() === false ) {
|
|
indexv --;
|
|
slide();
|
|
}
|
|
}
|
|
function navigateDown() {
|
|
// Prioritize revealing fragments
|
|
if( overviewIsActive() || nextFragment() === false ) {
|
|
indexv ++;
|
|
slide();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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();
|
|
}
|
|
}
|
|
|
|
// Expose some methods publicly
|
|
return {
|
|
initialize: initialize,
|
|
navigateTo: navigateTo,
|
|
navigateLeft: navigateLeft,
|
|
navigateRight: navigateRight,
|
|
navigateUp: navigateUp,
|
|
navigateDown: navigateDown,
|
|
|
|
// 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 );
|
|
}
|
|
};
|
|
|
|
})();
|
|
|