4745 lines
128 KiB
JavaScript
4745 lines
128 KiB
JavaScript
/*!
|
||
* reveal.js
|
||
* http://lab.hakim.se/reveal-js
|
||
* MIT licensed
|
||
*
|
||
* Copyright (C) 2016 Hakim El Hattab, http://hakim.se
|
||
*/
|
||
(function( root, factory ) {
|
||
if( typeof define === 'function' && define.amd ) {
|
||
// AMD. Register as an anonymous module.
|
||
define( function() {
|
||
root.Reveal = factory();
|
||
return root.Reveal;
|
||
} );
|
||
} else if( typeof exports === 'object' ) {
|
||
// Node. Does not work with strict CommonJS.
|
||
module.exports = factory();
|
||
} else {
|
||
// Browser globals.
|
||
root.Reveal = factory();
|
||
}
|
||
}( this, function() {
|
||
|
||
'use strict';
|
||
|
||
var Reveal;
|
||
|
||
// The reveal.js version
|
||
var VERSION = '3.3.0';
|
||
|
||
var SLIDES_SELECTOR = '.slides section',
|
||
HORIZONTAL_SLIDES_SELECTOR = '.slides>section',
|
||
VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section',
|
||
HOME_SLIDE_SELECTOR = '.slides>section:first-of-type',
|
||
UA = navigator.userAgent,
|
||
|
||
// Configuration defaults, can be overridden at initialization time
|
||
config = {
|
||
|
||
// The "normal" size of the presentation, aspect ratio will be preserved
|
||
// when the presentation is scaled to fit different resolutions
|
||
width: 960,
|
||
height: 700,
|
||
|
||
// Factor of the display size that should remain empty around the content
|
||
margin: 0.1,
|
||
|
||
// Bounds for smallest/largest possible scale to apply to content
|
||
minScale: 0.2,
|
||
maxScale: 1.5,
|
||
|
||
// Display controls in the bottom right corner
|
||
controls: true,
|
||
|
||
// Display a presentation progress bar
|
||
progress: true,
|
||
|
||
// Display the page number of the current slide
|
||
slideNumber: false,
|
||
|
||
// Push each slide change to the browser history
|
||
history: false,
|
||
|
||
// Enable keyboard shortcuts for navigation
|
||
keyboard: true,
|
||
|
||
// Optional function that blocks keyboard events when retuning false
|
||
keyboardCondition: null,
|
||
|
||
// Enable the slide overview mode
|
||
overview: true,
|
||
|
||
// Vertical centering of slides
|
||
center: true,
|
||
|
||
// Enables touch navigation on devices with touch input
|
||
touch: true,
|
||
|
||
// Loop the presentation
|
||
loop: false,
|
||
|
||
// Change the presentation direction to be RTL
|
||
rtl: false,
|
||
|
||
// Randomizes the order of slides each time the presentation loads
|
||
shuffle: false,
|
||
|
||
// Turns fragments on and off globally
|
||
fragments: true,
|
||
|
||
// Flags if the presentation is running in an embedded mode,
|
||
// i.e. contained within a limited portion of the screen
|
||
embedded: false,
|
||
|
||
// Flags if we should show a help overlay when the questionmark
|
||
// key is pressed
|
||
help: true,
|
||
|
||
// Flags if it should be possible to pause the presentation (blackout)
|
||
pause: true,
|
||
|
||
// Flags if speaker notes should be visible to all viewers
|
||
showNotes: false,
|
||
|
||
// Number of milliseconds between automatically proceeding to the
|
||
// next slide, disabled when set to 0, this value can be overwritten
|
||
// by using a data-autoslide attribute on your slides
|
||
autoSlide: 0,
|
||
|
||
// Stop auto-sliding after user input
|
||
autoSlideStoppable: true,
|
||
|
||
// Use this method for navigation when auto-sliding (defaults to navigateNext)
|
||
autoSlideMethod: null,
|
||
|
||
// Enable slide navigation via mouse wheel
|
||
mouseWheel: false,
|
||
|
||
// Apply a 3D roll to links on hover
|
||
rollingLinks: false,
|
||
|
||
// Hides the address bar on mobile devices
|
||
hideAddressBar: true,
|
||
|
||
// Opens links in an iframe preview overlay
|
||
previewLinks: false,
|
||
|
||
// Exposes the reveal.js API through window.postMessage
|
||
postMessage: true,
|
||
|
||
// Dispatches all reveal.js events to the parent window through postMessage
|
||
postMessageEvents: false,
|
||
|
||
// Focuses body when page changes visiblity to ensure keyboard shortcuts work
|
||
focusBodyOnPageVisibilityChange: true,
|
||
|
||
// Transition style
|
||
transition: 'slide', // none/fade/slide/convex/concave/zoom
|
||
|
||
// Transition speed
|
||
transitionSpeed: 'default', // default/fast/slow
|
||
|
||
// Transition style for full page slide backgrounds
|
||
backgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom
|
||
|
||
// Parallax background image
|
||
parallaxBackgroundImage: '', // CSS syntax, e.g. "a.jpg"
|
||
|
||
// Parallax background size
|
||
parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
|
||
|
||
// Amount of pixels to move the parallax background per slide step
|
||
parallaxBackgroundHorizontal: null,
|
||
parallaxBackgroundVertical: null,
|
||
|
||
// Number of slides away from the current that are visible
|
||
viewDistance: 3,
|
||
|
||
// Script dependencies to load
|
||
dependencies: []
|
||
|
||
},
|
||
|
||
// Flags if reveal.js is loaded (has dispatched the 'ready' event)
|
||
loaded = false,
|
||
|
||
// Flags if the overview mode is currently active
|
||
overview = false,
|
||
|
||
// Holds the dimensions of our overview slides, including margins
|
||
overviewSlideWidth = null,
|
||
overviewSlideHeight = null,
|
||
|
||
// The horizontal and vertical index of the currently active slide
|
||
indexh,
|
||
indexv,
|
||
|
||
// The previous and current slide HTML elements
|
||
previousSlide,
|
||
currentSlide,
|
||
|
||
previousBackground,
|
||
|
||
// Slides may hold a data-state attribute which we pick up and apply
|
||
// as a class to the body. This list contains the combined state of
|
||
// all current slides.
|
||
state = [],
|
||
|
||
// The current scale of the presentation (see width/height config)
|
||
scale = 1,
|
||
|
||
// CSS transform that is currently applied to the slides container,
|
||
// split into two groups
|
||
slidesTransform = { layout: '', overview: '' },
|
||
|
||
// Cached references to DOM elements
|
||
dom = {},
|
||
|
||
// Features supported by the browser, see #checkCapabilities()
|
||
features = {},
|
||
|
||
// Client is a mobile device, see #checkCapabilities()
|
||
isMobileDevice,
|
||
|
||
// Client is a desktop Chrome, see #checkCapabilities()
|
||
isChrome,
|
||
|
||
// Throttles mouse wheel navigation
|
||
lastMouseWheelStep = 0,
|
||
|
||
// Delays updates to the URL due to a Chrome thumbnailer bug
|
||
writeURLTimeout = 0,
|
||
|
||
// Flags if the interaction event listeners are bound
|
||
eventsAreBound = false,
|
||
|
||
// The current auto-slide duration
|
||
autoSlide = 0,
|
||
|
||
// Auto slide properties
|
||
autoSlidePlayer,
|
||
autoSlideTimeout = 0,
|
||
autoSlideStartTime = -1,
|
||
autoSlidePaused = false,
|
||
|
||
// Holds information about the currently ongoing touch input
|
||
touch = {
|
||
startX: 0,
|
||
startY: 0,
|
||
startSpan: 0,
|
||
startCount: 0,
|
||
captured: false,
|
||
threshold: 40
|
||
},
|
||
|
||
// Holds information about the keyboard shortcuts
|
||
keyboardShortcuts = {
|
||
'N , SPACE': 'Next slide',
|
||
'P': 'Previous slide',
|
||
'← , H': 'Navigate left',
|
||
'→ , L': 'Navigate right',
|
||
'↑ , K': 'Navigate up',
|
||
'↓ , J': 'Navigate down',
|
||
'Home': 'First slide',
|
||
'End': 'Last slide',
|
||
'B , .': 'Pause',
|
||
'F': 'Fullscreen',
|
||
'ESC, O': 'Slide overview'
|
||
};
|
||
|
||
/**
|
||
* Starts up the presentation if the client is capable.
|
||
*/
|
||
function initialize( options ) {
|
||
|
||
checkCapabilities();
|
||
|
||
if( !features.transforms2d && !features.transforms3d ) {
|
||
document.body.setAttribute( 'class', 'no-transforms' );
|
||
|
||
// Since JS won't be running any further, we load all lazy
|
||
// loading elements upfront
|
||
var images = toArray( document.getElementsByTagName( 'img' ) ),
|
||
iframes = toArray( document.getElementsByTagName( 'iframe' ) );
|
||
|
||
var lazyLoadable = images.concat( iframes );
|
||
|
||
for( var i = 0, len = lazyLoadable.length; i < len; i++ ) {
|
||
var element = lazyLoadable[i];
|
||
if( element.getAttribute( 'data-src' ) ) {
|
||
element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
|
||
element.removeAttribute( 'data-src' );
|
||
}
|
||
}
|
||
|
||
// If the browser doesn't support core features we won't be
|
||
// using JavaScript to control the presentation
|
||
return;
|
||
}
|
||
|
||
// Cache references to key DOM elements
|
||
dom.wrapper = document.querySelector( '.reveal' );
|
||
dom.slides = document.querySelector( '.reveal .slides' );
|
||
|
||
// Force a layout when the whole page, incl fonts, has loaded
|
||
window.addEventListener( 'load', layout, false );
|
||
|
||
var query = Reveal.getQueryHash();
|
||
|
||
// Do not accept new dependencies via query config to avoid
|
||
// the potential of malicious script injection
|
||
if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
|
||
|
||
// Copy options over to our config object
|
||
extend( config, options );
|
||
extend( config, query );
|
||
|
||
// Hide the address bar in mobile browsers
|
||
hideAddressBar();
|
||
|
||
// Loads the dependencies and continues to #start() once done
|
||
load();
|
||
|
||
}
|
||
|
||
/**
|
||
* Inspect the client to see what it's capable of, this
|
||
* should only happens once per runtime.
|
||
*/
|
||
function checkCapabilities() {
|
||
|
||
isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( UA );
|
||
isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
|
||
|
||
var testElement = document.createElement( 'div' );
|
||
|
||
features.transforms3d = 'WebkitPerspective' in testElement.style ||
|
||
'MozPerspective' in testElement.style ||
|
||
'msPerspective' in testElement.style ||
|
||
'OPerspective' in testElement.style ||
|
||
'perspective' in testElement.style;
|
||
|
||
features.transforms2d = 'WebkitTransform' in testElement.style ||
|
||
'MozTransform' in testElement.style ||
|
||
'msTransform' in testElement.style ||
|
||
'OTransform' in testElement.style ||
|
||
'transform' in testElement.style;
|
||
|
||
features.requestAnimationFrameMethod = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
|
||
features.requestAnimationFrame = typeof features.requestAnimationFrameMethod === 'function';
|
||
|
||
features.canvas = !!document.createElement( 'canvas' ).getContext;
|
||
|
||
// Transitions in the overview are disabled in desktop and
|
||
// Safari due to lag
|
||
features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( UA );
|
||
|
||
// Flags if we should use zoom instead of transform to scale
|
||
// up slides. Zoom produces crisper results but has a lot of
|
||
// xbrowser quirks so we only use it in whitelsited browsers.
|
||
features.zoom = 'zoom' in testElement.style && !isMobileDevice &&
|
||
( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
|
||
|
||
}
|
||
|
||
/**
|
||
* Loads the dependencies of reveal.js. Dependencies are
|
||
* defined via the configuration option 'dependencies'
|
||
* and will be loaded prior to starting/binding reveal.js.
|
||
* Some dependencies may have an 'async' flag, if so they
|
||
* will load after reveal.js has been started up.
|
||
*/
|
||
function load() {
|
||
|
||
var scripts = [],
|
||
scriptsAsync = [],
|
||
scriptsToPreload = 0;
|
||
|
||
// Called once synchronous scripts finish loading
|
||
function proceed() {
|
||
if( scriptsAsync.length ) {
|
||
// Load asynchronous scripts
|
||
head.js.apply( null, scriptsAsync );
|
||
}
|
||
|
||
start();
|
||
}
|
||
|
||
function loadScript( s ) {
|
||
head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], function() {
|
||
// Extension may contain callback functions
|
||
if( typeof s.callback === 'function' ) {
|
||
s.callback.apply( this );
|
||
}
|
||
|
||
if( --scriptsToPreload === 0 ) {
|
||
proceed();
|
||
}
|
||
});
|
||
}
|
||
|
||
for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
|
||
var s = config.dependencies[i];
|
||
|
||
// Load if there's no condition or the condition is truthy
|
||
if( !s.condition || s.condition() ) {
|
||
if( s.async ) {
|
||
scriptsAsync.push( s.src );
|
||
}
|
||
else {
|
||
scripts.push( s.src );
|
||
}
|
||
|
||
loadScript( s );
|
||
}
|
||
}
|
||
|
||
if( scripts.length ) {
|
||
scriptsToPreload = scripts.length;
|
||
|
||
// Load synchronous scripts
|
||
head.js.apply( null, scripts );
|
||
}
|
||
else {
|
||
proceed();
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Starts up reveal.js by binding input events and navigating
|
||
* to the current URL deeplink if there is one.
|
||
*/
|
||
function start() {
|
||
|
||
// Make sure we've got all the DOM elements we need
|
||
setupDOM();
|
||
|
||
// Listen to messages posted to this window
|
||
setupPostMessage();
|
||
|
||
// Prevent the slides from being scrolled out of view
|
||
setupScrollPrevention();
|
||
|
||
// Resets all vertical slides so that only the first is visible
|
||
resetVerticalSlides();
|
||
|
||
// Updates the presentation to match the current configuration values
|
||
configure();
|
||
|
||
// Read the initial hash
|
||
readURL();
|
||
|
||
// Update all backgrounds
|
||
updateBackground( true );
|
||
|
||
// Notify listeners that the presentation is ready but use a 1ms
|
||
// timeout to ensure it's not fired synchronously after #initialize()
|
||
setTimeout( function() {
|
||
// Enable transitions now that we're loaded
|
||
dom.slides.classList.remove( 'no-transition' );
|
||
|
||
loaded = true;
|
||
|
||
dispatchEvent( 'ready', {
|
||
'indexh': indexh,
|
||
'indexv': indexv,
|
||
'currentSlide': currentSlide
|
||
} );
|
||
}, 1 );
|
||
|
||
// Special setup and config is required when printing to PDF
|
||
if( isPrintingPDF() ) {
|
||
removeEventListeners();
|
||
|
||
// The document needs to have loaded for the PDF layout
|
||
// measurements to be accurate
|
||
if( document.readyState === 'complete' ) {
|
||
setupPDF();
|
||
}
|
||
else {
|
||
window.addEventListener( 'load', setupPDF );
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Finds and stores references to DOM elements which are
|
||
* required by the presentation. If a required element is
|
||
* not found, it is created.
|
||
*/
|
||
function setupDOM() {
|
||
|
||
// Prevent transitions while we're loading
|
||
dom.slides.classList.add( 'no-transition' );
|
||
|
||
// Background element
|
||
dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
|
||
|
||
// Progress bar
|
||
dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
|
||
dom.progressbar = dom.progress.querySelector( 'span' );
|
||
|
||
// Arrow controls
|
||
createSingletonNode( dom.wrapper, 'aside', 'controls',
|
||
'<button class="navigate-left" aria-label="previous slide"></button>' +
|
||
'<button class="navigate-right" aria-label="next slide"></button>' +
|
||
'<button class="navigate-up" aria-label="above slide"></button>' +
|
||
'<button class="navigate-down" aria-label="below slide"></button>' );
|
||
|
||
// Slide number
|
||
dom.slideNumber = createSingletonNode( dom.wrapper, 'div', 'slide-number', '' );
|
||
|
||
// Element containing notes that are visible to the audience
|
||
dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null );
|
||
dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' );
|
||
|
||
// Overlay graphic which is displayed during the paused mode
|
||
createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
|
||
|
||
// Cache references to elements
|
||
dom.controls = document.querySelector( '.reveal .controls' );
|
||
dom.theme = document.querySelector( '#theme' );
|
||
|
||
dom.wrapper.setAttribute( 'role', 'application' );
|
||
|
||
// There can be multiple instances of controls throughout the page
|
||
dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
|
||
dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
|
||
dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
|
||
dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
|
||
dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
|
||
dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
|
||
|
||
dom.statusDiv = createStatusDiv();
|
||
}
|
||
|
||
/**
|
||
* Creates a hidden div with role aria-live to announce the
|
||
* current slide content. Hide the div off-screen to make it
|
||
* available only to Assistive Technologies.
|
||
*/
|
||
function createStatusDiv() {
|
||
|
||
var statusDiv = document.getElementById( 'aria-status-div' );
|
||
if( !statusDiv ) {
|
||
statusDiv = document.createElement( 'div' );
|
||
statusDiv.style.position = 'absolute';
|
||
statusDiv.style.height = '1px';
|
||
statusDiv.style.width = '1px';
|
||
statusDiv.style.overflow ='hidden';
|
||
statusDiv.style.clip = 'rect( 1px, 1px, 1px, 1px )';
|
||
statusDiv.setAttribute( 'id', 'aria-status-div' );
|
||
statusDiv.setAttribute( 'aria-live', 'polite' );
|
||
statusDiv.setAttribute( 'aria-atomic','true' );
|
||
dom.wrapper.appendChild( statusDiv );
|
||
}
|
||
return statusDiv;
|
||
|
||
}
|
||
|
||
/**
|
||
* Configures the presentation for printing to a static
|
||
* PDF.
|
||
*/
|
||
function setupPDF() {
|
||
|
||
var slideSize = getComputedSlideSize( window.innerWidth, window.innerHeight );
|
||
|
||
// Dimensions of the PDF pages
|
||
var pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
|
||
pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
|
||
|
||
// Dimensions of slides within the pages
|
||
var slideWidth = slideSize.width,
|
||
slideHeight = slideSize.height;
|
||
|
||
// Let the browser know what page size we want to print
|
||
injectStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0;}' );
|
||
|
||
// Limit the size of certain elements to the dimensions of the slide
|
||
injectStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
|
||
|
||
document.body.classList.add( 'print-pdf' );
|
||
document.body.style.width = pageWidth + 'px';
|
||
document.body.style.height = pageHeight + 'px';
|
||
|
||
// Add each slide's index as attributes on itself, we need these
|
||
// indices to generate slide numbers below
|
||
toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
|
||
hslide.setAttribute( 'data-index-h', h );
|
||
|
||
if( hslide.classList.contains( 'stack' ) ) {
|
||
toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
|
||
vslide.setAttribute( 'data-index-h', h );
|
||
vslide.setAttribute( 'data-index-v', v );
|
||
} );
|
||
}
|
||
} );
|
||
|
||
// Slide and slide background layout
|
||
toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
|
||
|
||
// Vertical stacks are not centred since their section
|
||
// children will be
|
||
if( slide.classList.contains( 'stack' ) === false ) {
|
||
// Center the slide inside of the page, giving the slide some margin
|
||
var left = ( pageWidth - slideWidth ) / 2,
|
||
top = ( pageHeight - slideHeight ) / 2;
|
||
|
||
var contentHeight = getAbsoluteHeight( slide );
|
||
var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
|
||
|
||
// Center slides vertically
|
||
if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
|
||
top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
|
||
}
|
||
|
||
// Position the slide inside of the page
|
||
slide.style.left = left + 'px';
|
||
slide.style.top = top + 'px';
|
||
slide.style.width = slideWidth + 'px';
|
||
|
||
// TODO Backgrounds need to be multiplied when the slide
|
||
// stretches over multiple pages
|
||
var background = slide.querySelector( '.slide-background' );
|
||
if( background ) {
|
||
background.style.width = pageWidth + 'px';
|
||
background.style.height = ( pageHeight * numberOfPages ) + 'px';
|
||
background.style.top = -top + 'px';
|
||
background.style.left = -left + 'px';
|
||
}
|
||
|
||
// Inject notes if `showNotes` is enabled
|
||
if( config.showNotes ) {
|
||
var notes = getSlideNotes( slide );
|
||
if( notes ) {
|
||
var notesSpacing = 8;
|
||
var notesElement = document.createElement( 'div' );
|
||
notesElement.classList.add( 'speaker-notes' );
|
||
notesElement.classList.add( 'speaker-notes-pdf' );
|
||
notesElement.innerHTML = notes;
|
||
notesElement.style.left = ( notesSpacing - left ) + 'px';
|
||
notesElement.style.bottom = ( notesSpacing - top ) + 'px';
|
||
notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
|
||
slide.appendChild( notesElement );
|
||
}
|
||
}
|
||
|
||
// Inject slide numbers if `slideNumbers` are enabled
|
||
if( config.slideNumber ) {
|
||
var slideNumberH = parseInt( slide.getAttribute( 'data-index-h' ), 10 ) + 1,
|
||
slideNumberV = parseInt( slide.getAttribute( 'data-index-v' ), 10 ) + 1;
|
||
|
||
var numberElement = document.createElement( 'div' );
|
||
numberElement.classList.add( 'slide-number' );
|
||
numberElement.classList.add( 'slide-number-pdf' );
|
||
numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV );
|
||
background.appendChild( numberElement );
|
||
}
|
||
}
|
||
|
||
} );
|
||
|
||
// Show all fragments
|
||
toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' .fragment' ) ).forEach( function( fragment ) {
|
||
fragment.classList.add( 'visible' );
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* This is an unfortunate necessity. Some actions – such as
|
||
* an input field being focused in an iframe or using the
|
||
* keyboard to expand text selection beyond the bounds of
|
||
* a slide – can trigger our content to be pushed out of view.
|
||
* This scrolling can not be prevented by hiding overflow in
|
||
* CSS (we already do) so we have to resort to repeatedly
|
||
* checking if the slides have been offset :(
|
||
*/
|
||
function setupScrollPrevention() {
|
||
|
||
setInterval( function() {
|
||
if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
|
||
dom.wrapper.scrollTop = 0;
|
||
dom.wrapper.scrollLeft = 0;
|
||
}
|
||
}, 1000 );
|
||
|
||
}
|
||
|
||
/**
|
||
* Creates an HTML element and returns a reference to it.
|
||
* If the element already exists the existing instance will
|
||
* be returned.
|
||
*/
|
||
function createSingletonNode( container, tagname, classname, innerHTML ) {
|
||
|
||
// Find all nodes matching the description
|
||
var nodes = container.querySelectorAll( '.' + classname );
|
||
|
||
// Check all matches to find one which is a direct child of
|
||
// the specified container
|
||
for( var i = 0; i < nodes.length; i++ ) {
|
||
var testNode = nodes[i];
|
||
if( testNode.parentNode === container ) {
|
||
return testNode;
|
||
}
|
||
}
|
||
|
||
// If no node was found, create it now
|
||
var node = document.createElement( tagname );
|
||
node.classList.add( classname );
|
||
if( typeof innerHTML === 'string' ) {
|
||
node.innerHTML = innerHTML;
|
||
}
|
||
container.appendChild( node );
|
||
|
||
return node;
|
||
|
||
}
|
||
|
||
/**
|
||
* Creates the slide background elements and appends them
|
||
* to the background container. One element is created per
|
||
* slide no matter if the given slide has visible background.
|
||
*/
|
||
function createBackgrounds() {
|
||
|
||
var printMode = isPrintingPDF();
|
||
|
||
// Clear prior backgrounds
|
||
dom.background.innerHTML = '';
|
||
dom.background.classList.add( 'no-transition' );
|
||
|
||
// Iterate over all horizontal slides
|
||
toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
|
||
|
||
var backgroundStack;
|
||
|
||
if( printMode ) {
|
||
backgroundStack = createBackground( slideh, slideh );
|
||
}
|
||
else {
|
||
backgroundStack = createBackground( slideh, dom.background );
|
||
}
|
||
|
||
// Iterate over all vertical slides
|
||
toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
|
||
|
||
if( printMode ) {
|
||
createBackground( slidev, slidev );
|
||
}
|
||
else {
|
||
createBackground( slidev, backgroundStack );
|
||
}
|
||
|
||
backgroundStack.classList.add( 'stack' );
|
||
|
||
} );
|
||
|
||
} );
|
||
|
||
// Add parallax background if specified
|
||
if( config.parallaxBackgroundImage ) {
|
||
|
||
dom.background.style.backgroundImage = 'url("' + config.parallaxBackgroundImage + '")';
|
||
dom.background.style.backgroundSize = config.parallaxBackgroundSize;
|
||
|
||
// Make sure the below properties are set on the element - these properties are
|
||
// needed for proper transitions to be set on the element via CSS. To remove
|
||
// annoying background slide-in effect when the presentation starts, apply
|
||
// these properties after short time delay
|
||
setTimeout( function() {
|
||
dom.wrapper.classList.add( 'has-parallax-background' );
|
||
}, 1 );
|
||
|
||
}
|
||
else {
|
||
|
||
dom.background.style.backgroundImage = '';
|
||
dom.wrapper.classList.remove( 'has-parallax-background' );
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Creates a background for the given slide.
|
||
*
|
||
* @param {HTMLElement} slide
|
||
* @param {HTMLElement} container The element that the background
|
||
* should be appended to
|
||
*/
|
||
function createBackground( slide, container ) {
|
||
|
||
var data = {
|
||
background: slide.getAttribute( 'data-background' ),
|
||
backgroundSize: slide.getAttribute( 'data-background-size' ),
|
||
backgroundImage: slide.getAttribute( 'data-background-image' ),
|
||
backgroundVideo: slide.getAttribute( 'data-background-video' ),
|
||
backgroundIframe: slide.getAttribute( 'data-background-iframe' ),
|
||
backgroundColor: slide.getAttribute( 'data-background-color' ),
|
||
backgroundRepeat: slide.getAttribute( 'data-background-repeat' ),
|
||
backgroundPosition: slide.getAttribute( 'data-background-position' ),
|
||
backgroundTransition: slide.getAttribute( 'data-background-transition' )
|
||
};
|
||
|
||
var element = document.createElement( 'div' );
|
||
|
||
// Carry over custom classes from the slide to the background
|
||
element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
|
||
|
||
if( data.background ) {
|
||
// Auto-wrap image urls in url(...)
|
||
if( /^(http|file|\/\/)/gi.test( data.background ) || /\.(svg|png|jpg|jpeg|gif|bmp)$/gi.test( data.background ) ) {
|
||
slide.setAttribute( 'data-background-image', data.background );
|
||
}
|
||
else {
|
||
element.style.background = data.background;
|
||
}
|
||
}
|
||
|
||
// Create a hash for this combination of background settings.
|
||
// This is used to determine when two slide backgrounds are
|
||
// the same.
|
||
if( data.background || data.backgroundColor || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {
|
||
element.setAttribute( 'data-background-hash', data.background +
|
||
data.backgroundSize +
|
||
data.backgroundImage +
|
||
data.backgroundVideo +
|
||
data.backgroundIframe +
|
||
data.backgroundColor +
|
||
data.backgroundRepeat +
|
||
data.backgroundPosition +
|
||
data.backgroundTransition );
|
||
}
|
||
|
||
// Additional and optional background properties
|
||
if( data.backgroundSize ) element.style.backgroundSize = data.backgroundSize;
|
||
if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
|
||
if( data.backgroundRepeat ) element.style.backgroundRepeat = data.backgroundRepeat;
|
||
if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
|
||
if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
|
||
|
||
container.appendChild( element );
|
||
|
||
// If backgrounds are being recreated, clear old classes
|
||
slide.classList.remove( 'has-dark-background' );
|
||
slide.classList.remove( 'has-light-background' );
|
||
|
||
// If this slide has a background color, add a class that
|
||
// signals if it is light or dark. If the slide has no background
|
||
// color, no class will be set
|
||
var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor;
|
||
if( computedBackgroundColor ) {
|
||
var rgb = colorToRgb( computedBackgroundColor );
|
||
|
||
// Ignore fully transparent backgrounds. Some browsers return
|
||
// rgba(0,0,0,0) when reading the computed background color of
|
||
// an element with no background
|
||
if( rgb && rgb.a !== 0 ) {
|
||
if( colorBrightness( computedBackgroundColor ) < 128 ) {
|
||
slide.classList.add( 'has-dark-background' );
|
||
}
|
||
else {
|
||
slide.classList.add( 'has-light-background' );
|
||
}
|
||
}
|
||
}
|
||
|
||
return element;
|
||
|
||
}
|
||
|
||
/**
|
||
* Registers a listener to postMessage events, this makes it
|
||
* possible to call all reveal.js API methods from another
|
||
* window. For example:
|
||
*
|
||
* revealWindow.postMessage( JSON.stringify({
|
||
* method: 'slide',
|
||
* args: [ 2 ]
|
||
* }), '*' );
|
||
*/
|
||
function setupPostMessage() {
|
||
|
||
if( config.postMessage ) {
|
||
window.addEventListener( 'message', function ( event ) {
|
||
var data = event.data;
|
||
|
||
// Make sure we're dealing with JSON
|
||
if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {
|
||
data = JSON.parse( data );
|
||
|
||
// Check if the requested method can be found
|
||
if( data.method && typeof Reveal[data.method] === 'function' ) {
|
||
Reveal[data.method].apply( Reveal, data.args );
|
||
}
|
||
}
|
||
}, false );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Applies the configuration settings from the config
|
||
* object. May be called multiple times.
|
||
*/
|
||
function configure( options ) {
|
||
|
||
var numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
|
||
|
||
dom.wrapper.classList.remove( config.transition );
|
||
|
||
// New config options may be passed when this method
|
||
// is invoked through the API after initialization
|
||
if( typeof options === 'object' ) extend( config, options );
|
||
|
||
// Force linear transition based on browser capabilities
|
||
if( features.transforms3d === false ) config.transition = 'linear';
|
||
|
||
dom.wrapper.classList.add( config.transition );
|
||
|
||
dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
|
||
dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
|
||
|
||
dom.controls.style.display = config.controls ? 'block' : 'none';
|
||
dom.progress.style.display = config.progress ? 'block' : 'none';
|
||
dom.slideNumber.style.display = config.slideNumber && !isPrintingPDF() ? 'block' : 'none';
|
||
|
||
if( config.shuffle ) {
|
||
shuffle();
|
||
}
|
||
|
||
if( config.rtl ) {
|
||
dom.wrapper.classList.add( 'rtl' );
|
||
}
|
||
else {
|
||
dom.wrapper.classList.remove( 'rtl' );
|
||
}
|
||
|
||
if( config.center ) {
|
||
dom.wrapper.classList.add( 'center' );
|
||
}
|
||
else {
|
||
dom.wrapper.classList.remove( 'center' );
|
||
}
|
||
|
||
// Exit the paused mode if it was configured off
|
||
if( config.pause === false ) {
|
||
resume();
|
||
}
|
||
|
||
if( config.showNotes ) {
|
||
dom.speakerNotes.classList.add( 'visible' );
|
||
}
|
||
else {
|
||
dom.speakerNotes.classList.remove( 'visible' );
|
||
}
|
||
|
||
if( config.mouseWheel ) {
|
||
document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
|
||
document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
|
||
}
|
||
else {
|
||
document.removeEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
|
||
document.removeEventListener( 'mousewheel', onDocumentMouseScroll, false );
|
||
}
|
||
|
||
// Rolling 3D links
|
||
if( config.rollingLinks ) {
|
||
enableRollingLinks();
|
||
}
|
||
else {
|
||
disableRollingLinks();
|
||
}
|
||
|
||
// Iframe link previews
|
||
if( config.previewLinks ) {
|
||
enablePreviewLinks();
|
||
}
|
||
else {
|
||
disablePreviewLinks();
|
||
enablePreviewLinks( '[data-preview-link]' );
|
||
}
|
||
|
||
// Remove existing auto-slide controls
|
||
if( autoSlidePlayer ) {
|
||
autoSlidePlayer.destroy();
|
||
autoSlidePlayer = null;
|
||
}
|
||
|
||
// Generate auto-slide controls if needed
|
||
if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable && features.canvas && features.requestAnimationFrame ) {
|
||
autoSlidePlayer = new Playback( dom.wrapper, function() {
|
||
return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
|
||
} );
|
||
|
||
autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
|
||
autoSlidePaused = false;
|
||
}
|
||
|
||
// When fragments are turned off they should be visible
|
||
if( config.fragments === false ) {
|
||
toArray( dom.slides.querySelectorAll( '.fragment' ) ).forEach( function( element ) {
|
||
element.classList.add( 'visible' );
|
||
element.classList.remove( 'current-fragment' );
|
||
} );
|
||
}
|
||
|
||
sync();
|
||
|
||
}
|
||
|
||
/**
|
||
* Binds all event listeners.
|
||
*/
|
||
function addEventListeners() {
|
||
|
||
eventsAreBound = true;
|
||
|
||
window.addEventListener( 'hashchange', onWindowHashChange, false );
|
||
window.addEventListener( 'resize', onWindowResize, false );
|
||
|
||
if( config.touch ) {
|
||
dom.wrapper.addEventListener( 'touchstart', onTouchStart, false );
|
||
dom.wrapper.addEventListener( 'touchmove', onTouchMove, false );
|
||
dom.wrapper.addEventListener( 'touchend', onTouchEnd, false );
|
||
|
||
// Support pointer-style touch interaction as well
|
||
if( window.navigator.pointerEnabled ) {
|
||
// IE 11 uses un-prefixed version of pointer events
|
||
dom.wrapper.addEventListener( 'pointerdown', onPointerDown, false );
|
||
dom.wrapper.addEventListener( 'pointermove', onPointerMove, false );
|
||
dom.wrapper.addEventListener( 'pointerup', onPointerUp, false );
|
||
}
|
||
else if( window.navigator.msPointerEnabled ) {
|
||
// IE 10 uses prefixed version of pointer events
|
||
dom.wrapper.addEventListener( 'MSPointerDown', onPointerDown, false );
|
||
dom.wrapper.addEventListener( 'MSPointerMove', onPointerMove, false );
|
||
dom.wrapper.addEventListener( 'MSPointerUp', onPointerUp, false );
|
||
}
|
||
}
|
||
|
||
if( config.keyboard ) {
|
||
document.addEventListener( 'keydown', onDocumentKeyDown, false );
|
||
document.addEventListener( 'keypress', onDocumentKeyPress, false );
|
||
}
|
||
|
||
if( config.progress && dom.progress ) {
|
||
dom.progress.addEventListener( 'click', onProgressClicked, false );
|
||
}
|
||
|
||
if( config.focusBodyOnPageVisibilityChange ) {
|
||
var visibilityChange;
|
||
|
||
if( 'hidden' in document ) {
|
||
visibilityChange = 'visibilitychange';
|
||
}
|
||
else if( 'msHidden' in document ) {
|
||
visibilityChange = 'msvisibilitychange';
|
||
}
|
||
else if( 'webkitHidden' in document ) {
|
||
visibilityChange = 'webkitvisibilitychange';
|
||
}
|
||
|
||
if( visibilityChange ) {
|
||
document.addEventListener( visibilityChange, onPageVisibilityChange, false );
|
||
}
|
||
}
|
||
|
||
// Listen to both touch and click events, in case the device
|
||
// supports both
|
||
var pointerEvents = [ 'touchstart', 'click' ];
|
||
|
||
// Only support touch for Android, fixes double navigations in
|
||
// stock browser
|
||
if( UA.match( /android/gi ) ) {
|
||
pointerEvents = [ 'touchstart' ];
|
||
}
|
||
|
||
pointerEvents.forEach( function( eventName ) {
|
||
dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } );
|
||
dom.controlsRight.forEach( function( el ) { el.addEventListener( eventName, onNavigateRightClicked, false ); } );
|
||
dom.controlsUp.forEach( function( el ) { el.addEventListener( eventName, onNavigateUpClicked, false ); } );
|
||
dom.controlsDown.forEach( function( el ) { el.addEventListener( eventName, onNavigateDownClicked, false ); } );
|
||
dom.controlsPrev.forEach( function( el ) { el.addEventListener( eventName, onNavigatePrevClicked, false ); } );
|
||
dom.controlsNext.forEach( function( el ) { el.addEventListener( eventName, onNavigateNextClicked, false ); } );
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Unbinds all event listeners.
|
||
*/
|
||
function removeEventListeners() {
|
||
|
||
eventsAreBound = false;
|
||
|
||
document.removeEventListener( 'keydown', onDocumentKeyDown, false );
|
||
document.removeEventListener( 'keypress', onDocumentKeyPress, false );
|
||
window.removeEventListener( 'hashchange', onWindowHashChange, false );
|
||
window.removeEventListener( 'resize', onWindowResize, false );
|
||
|
||
dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
|
||
dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
|
||
dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
|
||
|
||
// IE11
|
||
if( window.navigator.pointerEnabled ) {
|
||
dom.wrapper.removeEventListener( 'pointerdown', onPointerDown, false );
|
||
dom.wrapper.removeEventListener( 'pointermove', onPointerMove, false );
|
||
dom.wrapper.removeEventListener( 'pointerup', onPointerUp, false );
|
||
}
|
||
// IE10
|
||
else if( window.navigator.msPointerEnabled ) {
|
||
dom.wrapper.removeEventListener( 'MSPointerDown', onPointerDown, false );
|
||
dom.wrapper.removeEventListener( 'MSPointerMove', onPointerMove, false );
|
||
dom.wrapper.removeEventListener( 'MSPointerUp', onPointerUp, false );
|
||
}
|
||
|
||
if ( config.progress && dom.progress ) {
|
||
dom.progress.removeEventListener( 'click', onProgressClicked, false );
|
||
}
|
||
|
||
[ 'touchstart', 'click' ].forEach( function( eventName ) {
|
||
dom.controlsLeft.forEach( function( el ) { el.removeEventListener( eventName, onNavigateLeftClicked, false ); } );
|
||
dom.controlsRight.forEach( function( el ) { el.removeEventListener( eventName, onNavigateRightClicked, false ); } );
|
||
dom.controlsUp.forEach( function( el ) { el.removeEventListener( eventName, onNavigateUpClicked, false ); } );
|
||
dom.controlsDown.forEach( function( el ) { el.removeEventListener( eventName, onNavigateDownClicked, false ); } );
|
||
dom.controlsPrev.forEach( function( el ) { el.removeEventListener( eventName, onNavigatePrevClicked, false ); } );
|
||
dom.controlsNext.forEach( function( el ) { el.removeEventListener( eventName, onNavigateNextClicked, false ); } );
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Extend object a with the properties of object b.
|
||
* If there's a conflict, object b takes precedence.
|
||
*/
|
||
function extend( a, b ) {
|
||
|
||
for( var i in b ) {
|
||
a[ i ] = b[ i ];
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Converts the target object to an array.
|
||
*/
|
||
function toArray( o ) {
|
||
|
||
return Array.prototype.slice.call( o );
|
||
|
||
}
|
||
|
||
/**
|
||
* Utility for deserializing a value.
|
||
*/
|
||
function deserialize( value ) {
|
||
|
||
if( typeof value === 'string' ) {
|
||
if( value === 'null' ) return null;
|
||
else if( value === 'true' ) return true;
|
||
else if( value === 'false' ) return false;
|
||
else if( value.match( /^\d+$/ ) ) return parseFloat( value );
|
||
}
|
||
|
||
return value;
|
||
|
||
}
|
||
|
||
/**
|
||
* Measures the distance in pixels between point a
|
||
* and point b.
|
||
*
|
||
* @param {Object} a point with x/y properties
|
||
* @param {Object} b point with x/y properties
|
||
*/
|
||
function distanceBetween( a, b ) {
|
||
|
||
var dx = a.x - b.x,
|
||
dy = a.y - b.y;
|
||
|
||
return Math.sqrt( dx*dx + dy*dy );
|
||
|
||
}
|
||
|
||
/**
|
||
* Applies a CSS transform to the target element.
|
||
*/
|
||
function transformElement( element, transform ) {
|
||
|
||
element.style.WebkitTransform = transform;
|
||
element.style.MozTransform = transform;
|
||
element.style.msTransform = transform;
|
||
element.style.transform = transform;
|
||
|
||
}
|
||
|
||
/**
|
||
* Applies CSS transforms to the slides container. The container
|
||
* is transformed from two separate sources: layout and the overview
|
||
* mode.
|
||
*/
|
||
function transformSlides( transforms ) {
|
||
|
||
// Pick up new transforms from arguments
|
||
if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;
|
||
if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;
|
||
|
||
// Apply the transforms to the slides container
|
||
if( slidesTransform.layout ) {
|
||
transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
|
||
}
|
||
else {
|
||
transformElement( dom.slides, slidesTransform.overview );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Injects the given CSS styles into the DOM.
|
||
*/
|
||
function injectStyleSheet( value ) {
|
||
|
||
var tag = document.createElement( 'style' );
|
||
tag.type = 'text/css';
|
||
if( tag.styleSheet ) {
|
||
tag.styleSheet.cssText = value;
|
||
}
|
||
else {
|
||
tag.appendChild( document.createTextNode( value ) );
|
||
}
|
||
document.getElementsByTagName( 'head' )[0].appendChild( tag );
|
||
|
||
}
|
||
|
||
/**
|
||
* Converts various color input formats to an {r:0,g:0,b:0} object.
|
||
*
|
||
* @param {String} color The string representation of a color,
|
||
* the following formats are supported:
|
||
* - #000
|
||
* - #000000
|
||
* - rgb(0,0,0)
|
||
*/
|
||
function colorToRgb( color ) {
|
||
|
||
var hex3 = color.match( /^#([0-9a-f]{3})$/i );
|
||
if( hex3 && hex3[1] ) {
|
||
hex3 = hex3[1];
|
||
return {
|
||
r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
|
||
g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
|
||
b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
|
||
};
|
||
}
|
||
|
||
var hex6 = color.match( /^#([0-9a-f]{6})$/i );
|
||
if( hex6 && hex6[1] ) {
|
||
hex6 = hex6[1];
|
||
return {
|
||
r: parseInt( hex6.substr( 0, 2 ), 16 ),
|
||
g: parseInt( hex6.substr( 2, 2 ), 16 ),
|
||
b: parseInt( hex6.substr( 4, 2 ), 16 )
|
||
};
|
||
}
|
||
|
||
var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
|
||
if( rgb ) {
|
||
return {
|
||
r: parseInt( rgb[1], 10 ),
|
||
g: parseInt( rgb[2], 10 ),
|
||
b: parseInt( rgb[3], 10 )
|
||
};
|
||
}
|
||
|
||
var rgba = color.match( /^rgba\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\,\s*([\d]+|[\d]*.[\d]+)\s*\)$/i );
|
||
if( rgba ) {
|
||
return {
|
||
r: parseInt( rgba[1], 10 ),
|
||
g: parseInt( rgba[2], 10 ),
|
||
b: parseInt( rgba[3], 10 ),
|
||
a: parseFloat( rgba[4] )
|
||
};
|
||
}
|
||
|
||
return null;
|
||
|
||
}
|
||
|
||
/**
|
||
* Calculates brightness on a scale of 0-255.
|
||
*
|
||
* @param color See colorStringToRgb for supported formats.
|
||
*/
|
||
function colorBrightness( color ) {
|
||
|
||
if( typeof color === 'string' ) color = colorToRgb( color );
|
||
|
||
if( color ) {
|
||
return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
|
||
}
|
||
|
||
return null;
|
||
|
||
}
|
||
|
||
/**
|
||
* Retrieves the height of the given element by looking
|
||
* at the position and height of its immediate children.
|
||
*/
|
||
function getAbsoluteHeight( element ) {
|
||
|
||
var height = 0;
|
||
|
||
if( element ) {
|
||
var absoluteChildren = 0;
|
||
|
||
toArray( element.childNodes ).forEach( function( child ) {
|
||
|
||
if( typeof child.offsetTop === 'number' && child.style ) {
|
||
// Count # of abs children
|
||
if( window.getComputedStyle( child ).position === 'absolute' ) {
|
||
absoluteChildren += 1;
|
||
}
|
||
|
||
height = Math.max( height, child.offsetTop + child.offsetHeight );
|
||
}
|
||
|
||
} );
|
||
|
||
// If there are no absolute children, use offsetHeight
|
||
if( absoluteChildren === 0 ) {
|
||
height = element.offsetHeight;
|
||
}
|
||
|
||
}
|
||
|
||
return height;
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns the remaining height within the parent of the
|
||
* target element.
|
||
*
|
||
* remaining height = [ configured parent height ] - [ current parent height ]
|
||
*/
|
||
function getRemainingHeight( element, height ) {
|
||
|
||
height = height || 0;
|
||
|
||
if( element ) {
|
||
var newHeight, oldHeight = element.style.height;
|
||
|
||
// Change the .stretch element height to 0 in order find the height of all
|
||
// the other elements
|
||
element.style.height = '0px';
|
||
newHeight = height - element.parentNode.offsetHeight;
|
||
|
||
// Restore the old height, just in case
|
||
element.style.height = oldHeight + 'px';
|
||
|
||
return newHeight;
|
||
}
|
||
|
||
return height;
|
||
|
||
}
|
||
|
||
/**
|
||
* Checks if this instance is being used to print a PDF.
|
||
*/
|
||
function isPrintingPDF() {
|
||
|
||
return ( /print-pdf/gi ).test( window.location.search );
|
||
|
||
}
|
||
|
||
/**
|
||
* Hides the address bar if we're on a mobile device.
|
||
*/
|
||
function hideAddressBar() {
|
||
|
||
if( config.hideAddressBar && isMobileDevice ) {
|
||
// Events that should trigger the address bar to hide
|
||
window.addEventListener( 'load', removeAddressBar, false );
|
||
window.addEventListener( 'orientationchange', removeAddressBar, false );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Causes the address bar to hide on mobile devices,
|
||
* more vertical space ftw.
|
||
*/
|
||
function removeAddressBar() {
|
||
|
||
setTimeout( function() {
|
||
window.scrollTo( 0, 1 );
|
||
}, 10 );
|
||
|
||
}
|
||
|
||
/**
|
||
* Dispatches an event of the specified type from the
|
||
* reveal DOM element.
|
||
*/
|
||
function dispatchEvent( type, args ) {
|
||
|
||
var event = document.createEvent( 'HTMLEvents', 1, 2 );
|
||
event.initEvent( type, true, true );
|
||
extend( event, args );
|
||
dom.wrapper.dispatchEvent( event );
|
||
|
||
// If we're in an iframe, post each reveal.js event to the
|
||
// parent window. Used by the notes plugin
|
||
if( config.postMessageEvents && window.parent !== window.self ) {
|
||
window.parent.postMessage( JSON.stringify({ namespace: 'reveal', eventName: type, state: getState() }), '*' );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Wrap all links in 3D goodness.
|
||
*/
|
||
function enableRollingLinks() {
|
||
|
||
if( features.transforms3d && !( 'msPerspective' in document.body.style ) ) {
|
||
var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a' );
|
||
|
||
for( var i = 0, len = anchors.length; i < len; i++ ) {
|
||
var anchor = anchors[i];
|
||
|
||
if( anchor.textContent && !anchor.querySelector( '*' ) && ( !anchor.className || !anchor.classList.contains( anchor, 'roll' ) ) ) {
|
||
var span = document.createElement('span');
|
||
span.setAttribute('data-title', anchor.text);
|
||
span.innerHTML = anchor.innerHTML;
|
||
|
||
anchor.classList.add( 'roll' );
|
||
anchor.innerHTML = '';
|
||
anchor.appendChild(span);
|
||
}
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Unwrap all 3D links.
|
||
*/
|
||
function disableRollingLinks() {
|
||
|
||
var anchors = dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ' a.roll' );
|
||
|
||
for( var i = 0, len = anchors.length; i < len; i++ ) {
|
||
var anchor = anchors[i];
|
||
var span = anchor.querySelector( 'span' );
|
||
|
||
if( span ) {
|
||
anchor.classList.remove( 'roll' );
|
||
anchor.innerHTML = span.innerHTML;
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Bind preview frame links.
|
||
*/
|
||
function enablePreviewLinks( selector ) {
|
||
|
||
var anchors = toArray( document.querySelectorAll( selector ? selector : 'a' ) );
|
||
|
||
anchors.forEach( function( element ) {
|
||
if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
|
||
element.addEventListener( 'click', onPreviewLinkClicked, false );
|
||
}
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Unbind preview frame links.
|
||
*/
|
||
function disablePreviewLinks() {
|
||
|
||
var anchors = toArray( document.querySelectorAll( 'a' ) );
|
||
|
||
anchors.forEach( function( element ) {
|
||
if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
|
||
element.removeEventListener( 'click', onPreviewLinkClicked, false );
|
||
}
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Opens a preview window for the target URL.
|
||
*/
|
||
function showPreview( url ) {
|
||
|
||
closeOverlay();
|
||
|
||
dom.overlay = document.createElement( 'div' );
|
||
dom.overlay.classList.add( 'overlay' );
|
||
dom.overlay.classList.add( 'overlay-preview' );
|
||
dom.wrapper.appendChild( dom.overlay );
|
||
|
||
dom.overlay.innerHTML = [
|
||
'<header>',
|
||
'<a class="close" href="#"><span class="icon"></span></a>',
|
||
'<a class="external" href="'+ url +'" target="_blank"><span class="icon"></span></a>',
|
||
'</header>',
|
||
'<div class="spinner"></div>',
|
||
'<div class="viewport">',
|
||
'<iframe src="'+ url +'"></iframe>',
|
||
'</div>'
|
||
].join('');
|
||
|
||
dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', function( event ) {
|
||
dom.overlay.classList.add( 'loaded' );
|
||
}, false );
|
||
|
||
dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
|
||
closeOverlay();
|
||
event.preventDefault();
|
||
}, false );
|
||
|
||
dom.overlay.querySelector( '.external' ).addEventListener( 'click', function( event ) {
|
||
closeOverlay();
|
||
}, false );
|
||
|
||
setTimeout( function() {
|
||
dom.overlay.classList.add( 'visible' );
|
||
}, 1 );
|
||
|
||
}
|
||
|
||
/**
|
||
* Opens a overlay window with help material.
|
||
*/
|
||
function showHelp() {
|
||
|
||
if( config.help ) {
|
||
|
||
closeOverlay();
|
||
|
||
dom.overlay = document.createElement( 'div' );
|
||
dom.overlay.classList.add( 'overlay' );
|
||
dom.overlay.classList.add( 'overlay-help' );
|
||
dom.wrapper.appendChild( dom.overlay );
|
||
|
||
var html = '<p class="title">Keyboard Shortcuts</p><br/>';
|
||
|
||
html += '<table><th>KEY</th><th>ACTION</th>';
|
||
for( var key in keyboardShortcuts ) {
|
||
html += '<tr><td>' + key + '</td><td>' + keyboardShortcuts[ key ] + '</td></tr>';
|
||
}
|
||
|
||
html += '</table>';
|
||
|
||
dom.overlay.innerHTML = [
|
||
'<header>',
|
||
'<a class="close" href="#"><span class="icon"></span></a>',
|
||
'</header>',
|
||
'<div class="viewport">',
|
||
'<div class="viewport-inner">'+ html +'</div>',
|
||
'</div>'
|
||
].join('');
|
||
|
||
dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) {
|
||
closeOverlay();
|
||
event.preventDefault();
|
||
}, false );
|
||
|
||
setTimeout( function() {
|
||
dom.overlay.classList.add( 'visible' );
|
||
}, 1 );
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Closes any currently open overlay.
|
||
*/
|
||
function closeOverlay() {
|
||
|
||
if( dom.overlay ) {
|
||
dom.overlay.parentNode.removeChild( dom.overlay );
|
||
dom.overlay = null;
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Applies JavaScript-controlled layout rules to the
|
||
* presentation.
|
||
*/
|
||
function layout() {
|
||
|
||
if( dom.wrapper && !isPrintingPDF() ) {
|
||
|
||
var size = getComputedSlideSize();
|
||
|
||
var slidePadding = 20; // TODO Dig this out of DOM
|
||
|
||
// Layout the contents of the slides
|
||
layoutSlideContents( config.width, config.height, slidePadding );
|
||
|
||
dom.slides.style.width = size.width + 'px';
|
||
dom.slides.style.height = size.height + 'px';
|
||
|
||
// Determine scale of content to fit within available space
|
||
scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );
|
||
|
||
// Respect max/min scale settings
|
||
scale = Math.max( scale, config.minScale );
|
||
scale = Math.min( scale, config.maxScale );
|
||
|
||
// Don't apply any scaling styles if scale is 1
|
||
if( scale === 1 ) {
|
||
dom.slides.style.zoom = '';
|
||
dom.slides.style.left = '';
|
||
dom.slides.style.top = '';
|
||
dom.slides.style.bottom = '';
|
||
dom.slides.style.right = '';
|
||
transformSlides( { layout: '' } );
|
||
}
|
||
else {
|
||
// Prefer zoom for scaling up so that content remains crisp.
|
||
// Don't use zoom to scale down since that can lead to shifts
|
||
// in text layout/line breaks.
|
||
if( scale > 1 && features.zoom ) {
|
||
dom.slides.style.zoom = scale;
|
||
dom.slides.style.left = '';
|
||
dom.slides.style.top = '';
|
||
dom.slides.style.bottom = '';
|
||
dom.slides.style.right = '';
|
||
transformSlides( { layout: '' } );
|
||
}
|
||
// Apply scale transform as a fallback
|
||
else {
|
||
dom.slides.style.zoom = '';
|
||
dom.slides.style.left = '50%';
|
||
dom.slides.style.top = '50%';
|
||
dom.slides.style.bottom = 'auto';
|
||
dom.slides.style.right = 'auto';
|
||
transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );
|
||
}
|
||
}
|
||
|
||
// Select all slides, vertical and horizontal
|
||
var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
|
||
|
||
for( var i = 0, len = slides.length; i < len; i++ ) {
|
||
var slide = slides[ i ];
|
||
|
||
// Don't bother updating invisible slides
|
||
if( slide.style.display === 'none' ) {
|
||
continue;
|
||
}
|
||
|
||
if( config.center || slide.classList.contains( 'center' ) ) {
|
||
// Vertical stacks are not centred since their section
|
||
// children will be
|
||
if( slide.classList.contains( 'stack' ) ) {
|
||
slide.style.top = 0;
|
||
}
|
||
else {
|
||
slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px';
|
||
}
|
||
}
|
||
else {
|
||
slide.style.top = '';
|
||
}
|
||
|
||
}
|
||
|
||
updateProgress();
|
||
updateParallax();
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Applies layout logic to the contents of all slides in
|
||
* the presentation.
|
||
*/
|
||
function layoutSlideContents( width, height, padding ) {
|
||
|
||
// Handle sizing of elements with the 'stretch' class
|
||
toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) {
|
||
|
||
// Determine how much vertical space we can use
|
||
var remainingHeight = getRemainingHeight( element, height );
|
||
|
||
// Consider the aspect ratio of media elements
|
||
if( /(img|video)/gi.test( element.nodeName ) ) {
|
||
var nw = element.naturalWidth || element.videoWidth,
|
||
nh = element.naturalHeight || element.videoHeight;
|
||
|
||
var es = Math.min( width / nw, remainingHeight / nh );
|
||
|
||
element.style.width = ( nw * es ) + 'px';
|
||
element.style.height = ( nh * es ) + 'px';
|
||
|
||
}
|
||
else {
|
||
element.style.width = width + 'px';
|
||
element.style.height = remainingHeight + 'px';
|
||
}
|
||
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Calculates the computed pixel size of our slides. These
|
||
* values are based on the width and height configuration
|
||
* options.
|
||
*/
|
||
function getComputedSlideSize( presentationWidth, presentationHeight ) {
|
||
|
||
var size = {
|
||
// Slide size
|
||
width: config.width,
|
||
height: config.height,
|
||
|
||
// Presentation size
|
||
presentationWidth: presentationWidth || dom.wrapper.offsetWidth,
|
||
presentationHeight: presentationHeight || dom.wrapper.offsetHeight
|
||
};
|
||
|
||
// Reduce available space by margin
|
||
size.presentationWidth -= ( size.presentationWidth * config.margin );
|
||
size.presentationHeight -= ( size.presentationHeight * config.margin );
|
||
|
||
// Slide width may be a percentage of available width
|
||
if( typeof size.width === 'string' && /%$/.test( size.width ) ) {
|
||
size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;
|
||
}
|
||
|
||
// Slide height may be a percentage of available height
|
||
if( typeof size.height === 'string' && /%$/.test( size.height ) ) {
|
||
size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;
|
||
}
|
||
|
||
return size;
|
||
|
||
}
|
||
|
||
/**
|
||
* Stores the vertical index of a stack so that the same
|
||
* vertical slide can be selected when navigating to and
|
||
* from the stack.
|
||
*
|
||
* @param {HTMLElement} stack The vertical stack element
|
||
* @param {int} v Index to memorize
|
||
*/
|
||
function setPreviousVerticalIndex( stack, v ) {
|
||
|
||
if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
|
||
stack.setAttribute( 'data-previous-indexv', v || 0 );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Retrieves the vertical index which was stored using
|
||
* #setPreviousVerticalIndex() or 0 if no previous index
|
||
* exists.
|
||
*
|
||
* @param {HTMLElement} stack The vertical stack element
|
||
*/
|
||
function getPreviousVerticalIndex( stack ) {
|
||
|
||
if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
|
||
// Prefer manually defined start-indexv
|
||
var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
|
||
|
||
return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
|
||
}
|
||
|
||
return 0;
|
||
|
||
}
|
||
|
||
/**
|
||
* Displays the overview of slides (quick nav) by scaling
|
||
* down and arranging all slide elements.
|
||
*/
|
||
function activateOverview() {
|
||
|
||
// Only proceed if enabled in config
|
||
if( config.overview && !isOverview() ) {
|
||
|
||
overview = true;
|
||
|
||
dom.wrapper.classList.add( 'overview' );
|
||
dom.wrapper.classList.remove( 'overview-deactivating' );
|
||
|
||
if( features.overviewTransitions ) {
|
||
setTimeout( function() {
|
||
dom.wrapper.classList.add( 'overview-animated' );
|
||
}, 1 );
|
||
}
|
||
|
||
// Don't auto-slide while in overview mode
|
||
cancelAutoSlide();
|
||
|
||
// Move the backgrounds element into the slide container to
|
||
// that the same scaling is applied
|
||
dom.slides.appendChild( dom.background );
|
||
|
||
// Clicking on an overview slide navigates to it
|
||
toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
|
||
if( !slide.classList.contains( 'stack' ) ) {
|
||
slide.addEventListener( 'click', onOverviewSlideClicked, true );
|
||
}
|
||
} );
|
||
|
||
// Calculate slide sizes
|
||
var margin = 70;
|
||
var slideSize = getComputedSlideSize();
|
||
overviewSlideWidth = slideSize.width + margin;
|
||
overviewSlideHeight = slideSize.height + margin;
|
||
|
||
// Reverse in RTL mode
|
||
if( config.rtl ) {
|
||
overviewSlideWidth = -overviewSlideWidth;
|
||
}
|
||
|
||
updateSlidesVisibility();
|
||
layoutOverview();
|
||
updateOverview();
|
||
|
||
layout();
|
||
|
||
// Notify observers of the overview showing
|
||
dispatchEvent( 'overviewshown', {
|
||
'indexh': indexh,
|
||
'indexv': indexv,
|
||
'currentSlide': currentSlide
|
||
} );
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Uses CSS transforms to position all slides in a grid for
|
||
* display inside of the overview mode.
|
||
*/
|
||
function layoutOverview() {
|
||
|
||
// Layout slides
|
||
toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) {
|
||
hslide.setAttribute( 'data-index-h', h );
|
||
transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
|
||
|
||
if( hslide.classList.contains( 'stack' ) ) {
|
||
|
||
toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) {
|
||
vslide.setAttribute( 'data-index-h', h );
|
||
vslide.setAttribute( 'data-index-v', v );
|
||
|
||
transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
|
||
} );
|
||
|
||
}
|
||
} );
|
||
|
||
// Layout slide backgrounds
|
||
toArray( dom.background.childNodes ).forEach( function( hbackground, h ) {
|
||
transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' );
|
||
|
||
toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) {
|
||
transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' );
|
||
} );
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Moves the overview viewport to the current slides.
|
||
* Called each time the current slide changes.
|
||
*/
|
||
function updateOverview() {
|
||
|
||
transformSlides( {
|
||
overview: [
|
||
'translateX('+ ( -indexh * overviewSlideWidth ) +'px)',
|
||
'translateY('+ ( -indexv * overviewSlideHeight ) +'px)',
|
||
'translateZ('+ ( window.innerWidth < 400 ? -1000 : -2500 ) +'px)'
|
||
].join( ' ' )
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Exits the slide overview and enters the currently
|
||
* active slide.
|
||
*/
|
||
function deactivateOverview() {
|
||
|
||
// Only proceed if enabled in config
|
||
if( config.overview ) {
|
||
|
||
overview = false;
|
||
|
||
dom.wrapper.classList.remove( 'overview' );
|
||
dom.wrapper.classList.remove( 'overview-animated' );
|
||
|
||
// Temporarily add a class so that transitions can do different things
|
||
// depending on whether they are exiting/entering overview, or just
|
||
// moving from slide to slide
|
||
dom.wrapper.classList.add( 'overview-deactivating' );
|
||
|
||
setTimeout( function () {
|
||
dom.wrapper.classList.remove( 'overview-deactivating' );
|
||
}, 1 );
|
||
|
||
// Move the background element back out
|
||
dom.wrapper.appendChild( dom.background );
|
||
|
||
// Clean up changes made to slides
|
||
toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
|
||
transformElement( slide, '' );
|
||
|
||
slide.removeEventListener( 'click', onOverviewSlideClicked, true );
|
||
} );
|
||
|
||
// Clean up changes made to backgrounds
|
||
toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) {
|
||
transformElement( background, '' );
|
||
} );
|
||
|
||
transformSlides( { overview: '' } );
|
||
|
||
slide( indexh, indexv );
|
||
|
||
layout();
|
||
|
||
cueAutoSlide();
|
||
|
||
// Notify observers of the overview hiding
|
||
dispatchEvent( 'overviewhidden', {
|
||
'indexh': indexh,
|
||
'indexv': indexv,
|
||
'currentSlide': currentSlide
|
||
} );
|
||
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Toggles the slide overview mode on and off.
|
||
*
|
||
* @param {Boolean} override Optional flag which overrides the
|
||
* toggle logic and forcibly sets the desired state. True means
|
||
* overview is open, false means it's closed.
|
||
*/
|
||
function toggleOverview( override ) {
|
||
|
||
if( typeof override === 'boolean' ) {
|
||
override ? activateOverview() : deactivateOverview();
|
||
}
|
||
else {
|
||
isOverview() ? deactivateOverview() : activateOverview();
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Checks if the overview is currently active.
|
||
*
|
||
* @return {Boolean} true if the overview is active,
|
||
* false otherwise
|
||
*/
|
||
function isOverview() {
|
||
|
||
return overview;
|
||
|
||
}
|
||
|
||
/**
|
||
* Checks if the current or specified slide is vertical
|
||
* (nested within another slide).
|
||
*
|
||
* @param {HTMLElement} slide [optional] The slide to check
|
||
* orientation of
|
||
*/
|
||
function isVerticalSlide( slide ) {
|
||
|
||
// Prefer slide argument, otherwise use current slide
|
||
slide = slide ? slide : currentSlide;
|
||
|
||
return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
|
||
|
||
}
|
||
|
||
/**
|
||
* Handling the fullscreen functionality via the fullscreen API
|
||
*
|
||
* @see http://fullscreen.spec.whatwg.org/
|
||
* @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
|
||
*/
|
||
function enterFullscreen() {
|
||
|
||
var element = document.documentElement;
|
||
|
||
// Check which implementation is available
|
||
var requestMethod = element.requestFullscreen ||
|
||
element.webkitRequestFullscreen ||
|
||
element.webkitRequestFullScreen ||
|
||
element.mozRequestFullScreen ||
|
||
element.msRequestFullscreen;
|
||
|
||
if( requestMethod ) {
|
||
requestMethod.apply( element );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Enters the paused mode which fades everything on screen to
|
||
* black.
|
||
*/
|
||
function pause() {
|
||
|
||
if( config.pause ) {
|
||
var wasPaused = dom.wrapper.classList.contains( 'paused' );
|
||
|
||
cancelAutoSlide();
|
||
dom.wrapper.classList.add( 'paused' );
|
||
|
||
if( wasPaused === false ) {
|
||
dispatchEvent( 'paused' );
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Exits from the paused mode.
|
||
*/
|
||
function resume() {
|
||
|
||
var wasPaused = dom.wrapper.classList.contains( 'paused' );
|
||
dom.wrapper.classList.remove( 'paused' );
|
||
|
||
cueAutoSlide();
|
||
|
||
if( wasPaused ) {
|
||
dispatchEvent( 'resumed' );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Toggles the paused mode on and off.
|
||
*/
|
||
function togglePause( override ) {
|
||
|
||
if( typeof override === 'boolean' ) {
|
||
override ? pause() : resume();
|
||
}
|
||
else {
|
||
isPaused() ? resume() : pause();
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Checks if we are currently in the paused mode.
|
||
*/
|
||
function isPaused() {
|
||
|
||
return dom.wrapper.classList.contains( 'paused' );
|
||
|
||
}
|
||
|
||
/**
|
||
* Toggles the auto slide mode on and off.
|
||
*
|
||
* @param {Boolean} override Optional flag which sets the desired state.
|
||
* True means autoplay starts, false means it stops.
|
||
*/
|
||
|
||
function toggleAutoSlide( override ) {
|
||
|
||
if( typeof override === 'boolean' ) {
|
||
override ? resumeAutoSlide() : pauseAutoSlide();
|
||
}
|
||
|
||
else {
|
||
autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Checks if the auto slide mode is currently on.
|
||
*/
|
||
function isAutoSliding() {
|
||
|
||
return !!( autoSlide && !autoSlidePaused );
|
||
|
||
}
|
||
|
||
/**
|
||
* Steps from the current point in the presentation to the
|
||
* slide which matches the specified horizontal and vertical
|
||
* indices.
|
||
*
|
||
* @param {int} h Horizontal index of the target slide
|
||
* @param {int} v Vertical index of the target slide
|
||
* @param {int} f Optional index of a fragment within the
|
||
* target slide to activate
|
||
* @param {int} o Optional origin for use in multimaster environments
|
||
*/
|
||
function slide( h, v, f, o ) {
|
||
|
||
// Remember where we were at before
|
||
previousSlide = currentSlide;
|
||
|
||
// Query all horizontal slides in the deck
|
||
var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
|
||
|
||
// If no vertical index is specified and the upcoming slide is a
|
||
// stack, resume at its previous vertical index
|
||
if( v === undefined && !isOverview() ) {
|
||
v = getPreviousVerticalIndex( horizontalSlides[ h ] );
|
||
}
|
||
|
||
// If we were on a vertical stack, remember what vertical index
|
||
// it was on so we can resume at the same position when returning
|
||
if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
|
||
setPreviousVerticalIndex( previousSlide.parentNode, indexv );
|
||
}
|
||
|
||
// Remember the state before this slide
|
||
var stateBefore = state.concat();
|
||
|
||
// Reset the state array
|
||
state.length = 0;
|
||
|
||
var indexhBefore = indexh || 0,
|
||
indexvBefore = indexv || 0;
|
||
|
||
// 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 );
|
||
|
||
// Update the visibility of slides now that the indices have changed
|
||
updateSlidesVisibility();
|
||
|
||
layout();
|
||
|
||
// 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 remains of the previous state
|
||
while( stateBefore.length ) {
|
||
document.documentElement.classList.remove( stateBefore.pop() );
|
||
}
|
||
|
||
// Update the overview if it's currently active
|
||
if( isOverview() ) {
|
||
updateOverview();
|
||
}
|
||
|
||
// Find the current horizontal slide and any possible vertical slides
|
||
// within it
|
||
var currentHorizontalSlide = horizontalSlides[ indexh ],
|
||
currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
|
||
|
||
// Store references to the previous and current slides
|
||
currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
|
||
|
||
// Show fragment, if specified
|
||
if( typeof f !== 'undefined' ) {
|
||
navigateFragment( f );
|
||
}
|
||
|
||
// Dispatch an event if the slide changed
|
||
var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
|
||
if( slideChanged ) {
|
||
dispatchEvent( 'slidechanged', {
|
||
'indexh': indexh,
|
||
'indexv': indexv,
|
||
'previousSlide': previousSlide,
|
||
'currentSlide': currentSlide,
|
||
'origin': o
|
||
} );
|
||
}
|
||
else {
|
||
// Ensure that the previous slide is never the same as the current
|
||
previousSlide = null;
|
||
}
|
||
|
||
// Solves an edge case where the previous slide maintains the
|
||
// 'present' class when navigating between adjacent vertical
|
||
// stacks
|
||
if( previousSlide ) {
|
||
previousSlide.classList.remove( 'present' );
|
||
previousSlide.setAttribute( 'aria-hidden', 'true' );
|
||
|
||
// Reset all slides upon navigate to home
|
||
// Issue: #285
|
||
if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
|
||
// Launch async task
|
||
setTimeout( function () {
|
||
var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
|
||
for( i in slides ) {
|
||
if( slides[i] ) {
|
||
// Reset stack
|
||
setPreviousVerticalIndex( slides[i], 0 );
|
||
}
|
||
}
|
||
}, 0 );
|
||
}
|
||
}
|
||
|
||
// Handle embedded content
|
||
if( slideChanged || !previousSlide ) {
|
||
stopEmbeddedContent( previousSlide );
|
||
startEmbeddedContent( currentSlide );
|
||
}
|
||
|
||
// Announce the current slide contents, for screen readers
|
||
dom.statusDiv.textContent = currentSlide.textContent;
|
||
|
||
updateControls();
|
||
updateProgress();
|
||
updateBackground();
|
||
updateParallax();
|
||
updateSlideNumber();
|
||
updateNotes();
|
||
|
||
// Update the URL hash
|
||
writeURL();
|
||
|
||
cueAutoSlide();
|
||
|
||
}
|
||
|
||
/**
|
||
* Syncs the presentation with the current DOM. Useful
|
||
* when new slides or control elements are added or when
|
||
* the configuration has changed.
|
||
*/
|
||
function sync() {
|
||
|
||
// Subscribe to input
|
||
removeEventListeners();
|
||
addEventListeners();
|
||
|
||
// Force a layout to make sure the current config is accounted for
|
||
layout();
|
||
|
||
// Reflect the current autoSlide value
|
||
autoSlide = config.autoSlide;
|
||
|
||
// Start auto-sliding if it's enabled
|
||
cueAutoSlide();
|
||
|
||
// Re-create the slide backgrounds
|
||
createBackgrounds();
|
||
|
||
// Write the current hash to the URL
|
||
writeURL();
|
||
|
||
sortAllFragments();
|
||
|
||
updateControls();
|
||
updateProgress();
|
||
updateBackground( true );
|
||
updateSlideNumber();
|
||
updateSlidesVisibility();
|
||
updateNotes();
|
||
|
||
formatEmbeddedContent();
|
||
startEmbeddedContent( currentSlide );
|
||
|
||
if( isOverview() ) {
|
||
layoutOverview();
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Resets all vertical slides so that only the first
|
||
* is visible.
|
||
*/
|
||
function resetVerticalSlides() {
|
||
|
||
var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
|
||
horizontalSlides.forEach( function( horizontalSlide ) {
|
||
|
||
var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
|
||
verticalSlides.forEach( function( verticalSlide, y ) {
|
||
|
||
if( y > 0 ) {
|
||
verticalSlide.classList.remove( 'present' );
|
||
verticalSlide.classList.remove( 'past' );
|
||
verticalSlide.classList.add( 'future' );
|
||
verticalSlide.setAttribute( 'aria-hidden', 'true' );
|
||
}
|
||
|
||
} );
|
||
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Sorts and formats all of fragments in the
|
||
* presentation.
|
||
*/
|
||
function sortAllFragments() {
|
||
|
||
var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
|
||
horizontalSlides.forEach( function( horizontalSlide ) {
|
||
|
||
var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
|
||
verticalSlides.forEach( function( verticalSlide, y ) {
|
||
|
||
sortFragments( verticalSlide.querySelectorAll( '.fragment' ) );
|
||
|
||
} );
|
||
|
||
if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) );
|
||
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Randomly shuffles all slides in the deck.
|
||
*/
|
||
function shuffle() {
|
||
|
||
var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
|
||
|
||
slides.forEach( function( slide ) {
|
||
|
||
// Insert this slide next to another random slide. This may
|
||
// cause the slide to insert before itself but that's fine.
|
||
dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
|
||
|
||
} );
|
||
|
||
}
|
||
|
||
/**
|
||
* Updates one dimension of slides by showing the slide
|
||
* with the specified index.
|
||
*
|
||
* @param {String} selector A CSS selector that will fetch
|
||
* the group of slides we are working with
|
||
* @param {Number} index The index of the slide that should be
|
||
* shown
|
||
*
|
||
* @return {Number} The index of the slide that is now shown,
|
||
* might differ from the passed in index if it was out of
|
||
* bounds.
|
||
*/
|
||
function updateSlides( selector, index ) {
|
||
|
||
// Select all slides and convert the NodeList result to
|
||
// an array
|
||
var slides = toArray( dom.wrapper.querySelectorAll( selector ) ),
|
||
slidesLength = slides.length;
|
||
|
||
var printMode = isPrintingPDF();
|
||
|
||
if( slidesLength ) {
|
||
|
||
// Should the index loop?
|
||
if( config.loop ) {
|
||
index %= slidesLength;
|
||
|
||
if( index < 0 ) {
|
||
index = slidesLength + index;
|
||
}
|
||
}
|
||
|
||
// Enforce max and minimum index bounds
|
||
index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
|
||
|
||
for( var i = 0; i < slidesLength; i++ ) {
|
||
var element = slides[i];
|
||
|
||
var reverse = config.rtl && !isVerticalSlide( element );
|
||
|
||
element.classList.remove( 'past' );
|
||
element.classList.remove( 'present' );
|
||
element.classList.remove( 'future' );
|
||
|
||
// http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute
|
||
element.setAttribute( 'hidden', '' );
|
||
element.setAttribute( 'aria-hidden', 'true' );
|
||
|
||
// If this element contains vertical slides
|
||
if( element.querySelector( 'section' ) ) {
|
||
element.classList.add( 'stack' );
|
||
}
|
||
|
||
// If we're printing static slides, all slides are "present"
|
||
if( printMode ) {
|
||
element.classList.add( 'present' );
|
||
continue;
|
||
}
|
||
|
||
if( i < index ) {
|
||
// Any element previous to index is given the 'past' class
|
||
element.classList.add( reverse ? 'future' : 'past' );
|
||
|
||
if( config.fragments ) {
|
||
var pastFragments = toArray( element.querySelectorAll( '.fragment' ) );
|
||
|
||
// Show all fragments on prior slides
|
||
while( pastFragments.length ) {
|
||
var pastFragment = pastFragments.pop();
|
||
pastFragment.classList.add( 'visible' );
|
||
pastFragment.classList.remove( 'current-fragment' );
|
||
}
|
||
}
|
||
}
|
||
else if( i > index ) {
|
||
// Any element subsequent to index is given the 'future' class
|
||
element.classList.add( reverse ? 'past' : 'future' );
|
||
|
||
if( config.fragments ) {
|
||
var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) );
|
||
|
||
// No fragments in future slides should be visible ahead of time
|
||
while( futureFragments.length ) {
|
||
var futureFragment = futureFragments.pop();
|
||
futureFragment.classList.remove( 'visible' );
|
||
futureFragment.classList.remove( 'current-fragment' );
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// Mark the current slide as present
|
||
slides[index].classList.add( 'present' );
|
||
slides[index].removeAttribute( 'hidden' );
|
||
slides[index].removeAttribute( 'aria-hidden' );
|
||
|
||
// 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;
|
||
|
||
}
|
||
|
||
/**
|
||
* Optimization method; hide all slides that are far away
|
||
* from the present slide.
|
||
*/
|
||
function updateSlidesVisibility() {
|
||
|
||
// Select all slides and convert the NodeList result to
|
||
// an array
|
||
var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ),
|
||
horizontalSlidesLength = horizontalSlides.length,
|
||
distanceX,
|
||
distanceY;
|
||
|
||
if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
|
||
|
||
// The number of steps away from the present slide that will
|
||
// be visible
|
||
var viewDistance = isOverview() ? 10 : config.viewDistance;
|
||
|
||
// Limit view distance on weaker devices
|
||
if( isMobileDevice ) {
|
||
viewDistance = isOverview() ? 6 : 2;
|
||
}
|
||
|
||
// All slides need to be visible when exporting to PDF
|
||
if( isPrintingPDF() ) {
|
||
viewDistance = Number.MAX_VALUE;
|
||
}
|
||
|
||
for( var x = 0; x < horizontalSlidesLength; x++ ) {
|
||
var horizontalSlide = horizontalSlides[x];
|
||
|
||
var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ),
|
||
verticalSlidesLength = verticalSlides.length;
|
||
|
||
// Determine how far away this slide is from the present
|
||
distanceX = Math.abs( ( indexh || 0 ) - x ) || 0;
|
||
|
||
// If the presentation is looped, distance should measure
|
||
// 1 between the first and last slides
|
||
if( config.loop ) {
|
||
distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
|
||
}
|
||
|
||
// Show the horizontal slide if it's within the view distance
|
||
if( distanceX < viewDistance ) {
|
||
showSlide( horizontalSlide );
|
||
}
|
||
else {
|
||
hideSlide( horizontalSlide );
|
||
}
|
||
|
||
if( verticalSlidesLength ) {
|
||
|
||
var oy = getPreviousVerticalIndex( horizontalSlide );
|
||
|
||
for( var y = 0; y < verticalSlidesLength; y++ ) {
|
||
var verticalSlide = verticalSlides[y];
|
||
|
||
distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
|
||
|
||
if( distanceX + distanceY < viewDistance ) {
|
||
showSlide( verticalSlide );
|
||
}
|
||
else {
|
||
hideSlide( verticalSlide );
|
||
}
|
||
}
|
||
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Pick up notes from the current slide and display tham
|
||
* to the viewer.
|
||
*
|
||
* @see `showNotes` config value
|
||
*/
|
||
function updateNotes() {
|
||
|
||
if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) {
|
||
|
||
dom.speakerNotes.innerHTML = getSlideNotes() || '';
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Updates the progress bar to reflect the current slide.
|
||
*/
|
||
function updateProgress() {
|
||
|
||
// Update progress if enabled
|
||
if( config.progress && dom.progressbar ) {
|
||
|
||
dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px';
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Updates the slide number div to reflect the current slide.
|
||
*
|
||
* The following slide number formats are available:
|
||
* "h.v": horizontal . vertical slide number (default)
|
||
* "h/v": horizontal / vertical slide number
|
||
* "c": flattened slide number
|
||
* "c/t": flattened slide number / total slides
|
||
*/
|
||
function updateSlideNumber() {
|
||
|
||
// Update slide number if enabled
|
||
if( config.slideNumber && dom.slideNumber ) {
|
||
|
||
var value = [];
|
||
var format = 'h.v';
|
||
|
||
// Check if a custom number format is available
|
||
if( typeof config.slideNumber === 'string' ) {
|
||
format = config.slideNumber;
|
||
}
|
||
|
||
switch( format ) {
|
||
case 'c':
|
||
value.push( getSlidePastCount() + 1 );
|
||
break;
|
||
case 'c/t':
|
||
value.push( getSlidePastCount() + 1, '/', getTotalSlides() );
|
||
break;
|
||
case 'h/v':
|
||
value.push( indexh + 1 );
|
||
if( isVerticalSlide() ) value.push( '/', indexv + 1 );
|
||
break;
|
||
default:
|
||
value.push( indexh + 1 );
|
||
if( isVerticalSlide() ) value.push( '.', indexv + 1 );
|
||
}
|
||
|
||
dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Applies HTML formatting to a slide number before it's
|
||
* written to the DOM.
|
||
*/
|
||
function formatSlideNumber( a, delimiter, b ) {
|
||
|
||
if( typeof b === 'number' && !isNaN( b ) ) {
|
||
return '<span class="slide-number-a">'+ a +'</span>' +
|
||
'<span class="slide-number-delimiter">'+ delimiter +'</span>' +
|
||
'<span class="slide-number-b">'+ b +'</span>';
|
||
}
|
||
else {
|
||
return '<span class="slide-number-a">'+ a +'</span>';
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Updates the state of all control/navigation arrows.
|
||
*/
|
||
function updateControls() {
|
||
|
||
var routes = availableRoutes();
|
||
var fragments = availableFragments();
|
||
|
||
// Remove the 'enabled' class from all directions
|
||
dom.controlsLeft.concat( dom.controlsRight )
|
||
.concat( dom.controlsUp )
|
||
.concat( dom.controlsDown )
|
||
.concat( dom.controlsPrev )
|
||
.concat( dom.controlsNext ).forEach( function( node ) {
|
||
node.classList.remove( 'enabled' );
|
||
node.classList.remove( 'fragmented' );
|
||
} );
|
||
|
||
// Add the 'enabled' class to the available routes
|
||
if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } );
|
||
if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
|
||
if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } );
|
||
if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );
|
||
|
||
// Prev/next buttons
|
||
if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
|
||
if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );
|
||
|
||
// Highlight fragment directions
|
||
if( currentSlide ) {
|
||
|
||
// Always apply fragment decorator to prev/next buttons
|
||
if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
|
||
if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
|
||
|
||
// Apply fragment decorators to directional buttons based on
|
||
// what slide axis they are in
|
||
if( isVerticalSlide( currentSlide ) ) {
|
||
if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
|
||
if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
|
||
}
|
||
else {
|
||
if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
|
||
if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } );
|
||
}
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Updates the background elements to reflect the current
|
||
* slide.
|
||
*
|
||
* @param {Boolean} includeAll If true, the backgrounds of
|
||
* all vertical slides (not just the present) will be updated.
|
||
*/
|
||
function updateBackground( includeAll ) {
|
||
|
||
var currentBackground = null;
|
||
|
||
// Reverse past/future classes when in RTL mode
|
||
var horizontalPast = config.rtl ? 'future' : 'past',
|
||
horizontalFuture = config.rtl ? 'past' : 'future';
|
||
|
||
// Update the classes of all backgrounds to match the
|
||
// states of their slides (past/present/future)
|
||
toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
|
||
|
||
backgroundh.classList.remove( 'past' );
|
||
backgroundh.classList.remove( 'present' );
|
||
backgroundh.classList.remove( 'future' );
|
||
|
||
if( h < indexh ) {
|
||
backgroundh.classList.add( horizontalPast );
|
||
}
|
||
else if ( h > indexh ) {
|
||
backgroundh.classList.add( horizontalFuture );
|
||
}
|
||
else {
|
||
backgroundh.classList.add( 'present' );
|
||
|
||
// Store a reference to the current background element
|
||
currentBackground = backgroundh;
|
||
}
|
||
|
||
if( includeAll || h === indexh ) {
|
||
toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) {
|
||
|
||
backgroundv.classList.remove( 'past' );
|
||
backgroundv.classList.remove( 'present' );
|
||
backgroundv.classList.remove( 'future' );
|
||
|
||
if( v < indexv ) {
|
||
backgroundv.classList.add( 'past' );
|
||
}
|
||
else if ( v > indexv ) {
|
||
backgroundv.classList.add( 'future' );
|
||
}
|
||
else {
|
||
backgroundv.classList.add( 'present' );
|
||
|
||
// Only if this is the present horizontal and vertical slide
|
||
if( h === indexh ) currentBackground = backgroundv;
|
||
}
|
||
|
||
} );
|
||
}
|
||
|
||
} );
|
||
|
||
// Stop any currently playing video background
|
||
if( previousBackground ) {
|
||
|
||
var previousVideo = previousBackground.querySelector( 'video' );
|
||
if( previousVideo ) previousVideo.pause();
|
||
|
||
}
|
||
|
||
if( currentBackground ) {
|
||
|
||
// Start video playback
|
||
var currentVideo = currentBackground.querySelector( 'video' );
|
||
if( currentVideo ) {
|
||
|
||
var startVideo = function() {
|
||
currentVideo.currentTime = 0;
|
||
currentVideo.play();
|
||
currentVideo.removeEventListener( 'loadeddata', startVideo );
|
||
};
|
||
|
||
if( currentVideo.readyState > 1 ) {
|
||
startVideo();
|
||
}
|
||
else {
|
||
currentVideo.addEventListener( 'loadeddata', startVideo );
|
||
}
|
||
|
||
}
|
||
|
||
var backgroundImageURL = currentBackground.style.backgroundImage || '';
|
||
|
||
// Restart GIFs (doesn't work in Firefox)
|
||
if( /\.gif/i.test( backgroundImageURL ) ) {
|
||
currentBackground.style.backgroundImage = '';
|
||
window.getComputedStyle( currentBackground ).opacity;
|
||
currentBackground.style.backgroundImage = backgroundImageURL;
|
||
}
|
||
|
||
// Don't transition between identical backgrounds. This
|
||
// prevents unwanted flicker.
|
||
var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null;
|
||
var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
|
||
if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) {
|
||
dom.background.classList.add( 'no-transition' );
|
||
}
|
||
|
||
previousBackground = currentBackground;
|
||
|
||
}
|
||
|
||
// If there's a background brightness flag for this slide,
|
||
// bubble it to the .reveal container
|
||
if( currentSlide ) {
|
||
[ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) {
|
||
if( currentSlide.classList.contains( classToBubble ) ) {
|
||
dom.wrapper.classList.add( classToBubble );
|
||
}
|
||
else {
|
||
dom.wrapper.classList.remove( classToBubble );
|
||
}
|
||
} );
|
||
}
|
||
|
||
// Allow the first background to apply without transition
|
||
setTimeout( function() {
|
||
dom.background.classList.remove( 'no-transition' );
|
||
}, 1 );
|
||
|
||
}
|
||
|
||
/**
|
||
* Updates the position of the parallax background based
|
||
* on the current slide index.
|
||
*/
|
||
function updateParallax() {
|
||
|
||
if( config.parallaxBackgroundImage ) {
|
||
|
||
var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
|
||
verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
|
||
|
||
var backgroundSize = dom.background.style.backgroundSize.split( ' ' ),
|
||
backgroundWidth, backgroundHeight;
|
||
|
||
if( backgroundSize.length === 1 ) {
|
||
backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );
|
||
}
|
||
else {
|
||
backgroundWidth = parseInt( backgroundSize[0], 10 );
|
||
backgroundHeight = parseInt( backgroundSize[1], 10 );
|
||
}
|
||
|
||
var slideWidth = dom.background.offsetWidth,
|
||
horizontalSlideCount = horizontalSlides.length,
|
||
horizontalOffsetMultiplier,
|
||
horizontalOffset;
|
||
|
||
if( typeof config.parallaxBackgroundHorizontal === 'number' ) {
|
||
horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal;
|
||
}
|
||
else {
|
||
horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
|
||
}
|
||
|
||
horizontalOffset = horizontalOffsetMultiplier * indexh * -1;
|
||
|
||
var slideHeight = dom.background.offsetHeight,
|
||
verticalSlideCount = verticalSlides.length,
|
||
verticalOffsetMultiplier,
|
||
verticalOffset;
|
||
|
||
if( typeof config.parallaxBackgroundVertical === 'number' ) {
|
||
verticalOffsetMultiplier = config.parallaxBackgroundVertical;
|
||
}
|
||
else {
|
||
verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
|
||
}
|
||
|
||
verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv * 1 : 0;
|
||
|
||
dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Called when the given slide is within the configured view
|
||
* distance. Shows the slide element and loads any content
|
||
* that is set to load lazily (data-src).
|
||
*/
|
||
function showSlide( slide ) {
|
||
|
||
// Show the slide element
|
||
slide.style.display = 'block';
|
||
|
||
// Media elements with data-src attributes
|
||
toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) {
|
||
element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
|
||
element.removeAttribute( 'data-src' );
|
||
} );
|
||
|
||
// Media elements with <source> children
|
||
toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) {
|
||
var sources = 0;
|
||
|
||
toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) {
|
||
source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
|
||
source.removeAttribute( 'data-src' );
|
||
sources += 1;
|
||
} );
|
||
|
||
// If we rewrote sources for this video/audio element, we need
|
||
// to manually tell it to load from its new origin
|
||
if( sources > 0 ) {
|
||
media.load();
|
||
}
|
||
} );
|
||
|
||
|
||
// Show the corresponding background element
|
||
var indices = getIndices( slide );
|
||
var background = getSlideBackground( indices.h, indices.v );
|
||
if( background ) {
|
||
background.style.display = 'block';
|
||
|
||
// If the background contains media, load it
|
||
if( background.hasAttribute( 'data-loaded' ) === false ) {
|
||
background.setAttribute( 'data-loaded', 'true' );
|
||
|
||
var backgroundImage = slide.getAttribute( 'data-background-image' ),
|
||
backgroundVideo = slide.getAttribute( 'data-background-video' ),
|
||
backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
|
||
backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ),
|
||
backgroundIframe = slide.getAttribute( 'data-background-iframe' );
|
||
|
||
// Images
|
||
if( backgroundImage ) {
|
||
background.style.backgroundImage = 'url('+ backgroundImage +')';
|
||
}
|
||
// Videos
|
||
else if ( backgroundVideo && !isSpeakerNotes() ) {
|
||
var video = document.createElement( 'video' );
|
||
|
||
if( backgroundVideoLoop ) {
|
||
video.setAttribute( 'loop', '' );
|
||
}
|
||
|
||
if( backgroundVideoMuted ) {
|
||
video.muted = true;
|
||
}
|
||
|
||
// Support comma separated lists of video sources
|
||
backgroundVideo.split( ',' ).forEach( function( source ) {
|
||
video.innerHTML += '<source src="'+ source +'">';
|
||
} );
|
||
|
||
background.appendChild( video );
|
||
}
|
||
// Iframes
|
||
else if( backgroundIframe ) {
|
||
var iframe = document.createElement( 'iframe' );
|
||
iframe.setAttribute( 'src', backgroundIframe );
|
||
iframe.style.width = '100%';
|
||
iframe.style.height = '100%';
|
||
iframe.style.maxHeight = '100%';
|
||
iframe.style.maxWidth = '100%';
|
||
|
||
background.appendChild( iframe );
|
||
}
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Called when the given slide is moved outside of the
|
||
* configured view distance.
|
||
*/
|
||
function hideSlide( slide ) {
|
||
|
||
// Hide the slide element
|
||
slide.style.display = 'none';
|
||
|
||
// Hide the corresponding background element
|
||
var indices = getIndices( slide );
|
||
var background = getSlideBackground( indices.h, indices.v );
|
||
if( background ) {
|
||
background.style.display = 'none';
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Determine what available routes there are for navigation.
|
||
*
|
||
* @return {Object} containing four booleans: left/right/up/down
|
||
*/
|
||
function availableRoutes() {
|
||
|
||
var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
|
||
verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
|
||
|
||
var routes = {
|
||
left: indexh > 0 || config.loop,
|
||
right: indexh < horizontalSlides.length - 1 || config.loop,
|
||
up: indexv > 0,
|
||
down: indexv < verticalSlides.length - 1
|
||
};
|
||
|
||
// reverse horizontal controls for rtl
|
||
if( config.rtl ) {
|
||
var left = routes.left;
|
||
routes.left = routes.right;
|
||
routes.right = left;
|
||
}
|
||
|
||
return routes;
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns an object describing the available fragment
|
||
* directions.
|
||
*
|
||
* @return {Object} two boolean properties: prev/next
|
||
*/
|
||
function availableFragments() {
|
||
|
||
if( currentSlide && config.fragments ) {
|
||
var fragments = currentSlide.querySelectorAll( '.fragment' );
|
||
var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' );
|
||
|
||
return {
|
||
prev: fragments.length - hiddenFragments.length > 0,
|
||
next: !!hiddenFragments.length
|
||
};
|
||
}
|
||
else {
|
||
return { prev: false, next: false };
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Enforces origin-specific format rules for embedded media.
|
||
*/
|
||
function formatEmbeddedContent() {
|
||
|
||
var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) {
|
||
toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) {
|
||
var src = el.getAttribute( sourceAttribute );
|
||
if( src && src.indexOf( param ) === -1 ) {
|
||
el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param );
|
||
}
|
||
});
|
||
};
|
||
|
||
// YouTube frames must include "?enablejsapi=1"
|
||
_appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );
|
||
_appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );
|
||
|
||
// Vimeo frames must include "?api=1"
|
||
_appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );
|
||
_appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );
|
||
|
||
}
|
||
|
||
/**
|
||
* Start playback of any embedded content inside of
|
||
* the targeted slide.
|
||
*/
|
||
function startEmbeddedContent( slide ) {
|
||
|
||
if( slide && !isSpeakerNotes() ) {
|
||
// Restart GIFs
|
||
toArray( slide.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) {
|
||
// Setting the same unchanged source like this was confirmed
|
||
// to work in Chrome, FF & Safari
|
||
el.setAttribute( 'src', el.getAttribute( 'src' ) );
|
||
} );
|
||
|
||
// HTML5 media elements
|
||
toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
|
||
if( el.hasAttribute( 'data-autoplay' ) && typeof el.play === 'function' ) {
|
||
el.play();
|
||
}
|
||
} );
|
||
|
||
// Normal iframes
|
||
toArray( slide.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) {
|
||
startEmbeddedIframe( { target: el } );
|
||
} );
|
||
|
||
// Lazy loading iframes
|
||
toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
|
||
if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
|
||
el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes
|
||
el.addEventListener( 'load', startEmbeddedIframe );
|
||
el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
|
||
}
|
||
} );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* "Starts" the content of an embedded iframe using the
|
||
* postmessage API.
|
||
*/
|
||
function startEmbeddedIframe( event ) {
|
||
|
||
var iframe = event.target;
|
||
|
||
// YouTube postMessage API
|
||
if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
|
||
iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
|
||
}
|
||
// Vimeo postMessage API
|
||
else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) {
|
||
iframe.contentWindow.postMessage( '{"method":"play"}', '*' );
|
||
}
|
||
// Generic postMessage API
|
||
else {
|
||
iframe.contentWindow.postMessage( 'slide:start', '*' );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Stop playback of any embedded content inside of
|
||
* the targeted slide.
|
||
*/
|
||
function stopEmbeddedContent( slide ) {
|
||
|
||
if( slide && slide.parentNode ) {
|
||
// HTML5 media elements
|
||
toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
|
||
if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {
|
||
el.pause();
|
||
}
|
||
} );
|
||
|
||
// Generic postMessage API for non-lazy loaded iframes
|
||
toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
|
||
el.contentWindow.postMessage( 'slide:stop', '*' );
|
||
el.removeEventListener( 'load', startEmbeddedIframe );
|
||
});
|
||
|
||
// YouTube postMessage API
|
||
toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
|
||
if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
|
||
el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
|
||
}
|
||
});
|
||
|
||
// Vimeo postMessage API
|
||
toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
|
||
if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
|
||
el.contentWindow.postMessage( '{"method":"pause"}', '*' );
|
||
}
|
||
});
|
||
|
||
// Lazy loading iframes
|
||
toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) {
|
||
// Only removing the src doesn't actually unload the frame
|
||
// in all browsers (Firefox) so we set it to blank first
|
||
el.setAttribute( 'src', 'about:blank' );
|
||
el.removeAttribute( 'src' );
|
||
} );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns the number of past slides. This can be used as a global
|
||
* flattened index for slides.
|
||
*/
|
||
function getSlidePastCount() {
|
||
|
||
var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
|
||
|
||
// The number of past slides
|
||
var pastCount = 0;
|
||
|
||
// Step through all slides and count the past ones
|
||
mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {
|
||
|
||
var horizontalSlide = horizontalSlides[i];
|
||
var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );
|
||
|
||
for( var j = 0; j < verticalSlides.length; j++ ) {
|
||
|
||
// Stop as soon as we arrive at the present
|
||
if( verticalSlides[j].classList.contains( 'present' ) ) {
|
||
break mainLoop;
|
||
}
|
||
|
||
pastCount++;
|
||
|
||
}
|
||
|
||
// Stop as soon as we arrive at the present
|
||
if( horizontalSlide.classList.contains( 'present' ) ) {
|
||
break;
|
||
}
|
||
|
||
// Don't count the wrapping section for vertical slides
|
||
if( horizontalSlide.classList.contains( 'stack' ) === false ) {
|
||
pastCount++;
|
||
}
|
||
|
||
}
|
||
|
||
return pastCount;
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns a value ranging from 0-1 that represents
|
||
* how far into the presentation we have navigated.
|
||
*/
|
||
function getProgress() {
|
||
|
||
// The number of past and total slides
|
||
var totalCount = getTotalSlides();
|
||
var pastCount = getSlidePastCount();
|
||
|
||
if( currentSlide ) {
|
||
|
||
var allFragments = currentSlide.querySelectorAll( '.fragment' );
|
||
|
||
// If there are fragments in the current slide those should be
|
||
// accounted for in the progress.
|
||
if( allFragments.length > 0 ) {
|
||
var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );
|
||
|
||
// This value represents how big a portion of the slide progress
|
||
// that is made up by its fragments (0-1)
|
||
var fragmentWeight = 0.9;
|
||
|
||
// Add fragment progress to the past slide count
|
||
pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
|
||
}
|
||
|
||
}
|
||
|
||
return pastCount / ( totalCount - 1 );
|
||
|
||
}
|
||
|
||
/**
|
||
* Checks if this presentation is running inside of the
|
||
* speaker notes window.
|
||
*/
|
||
function isSpeakerNotes() {
|
||
|
||
return !!window.location.search.match( /receiver/gi );
|
||
|
||
}
|
||
|
||
/**
|
||
* Reads the current URL (hash) and navigates accordingly.
|
||
*/
|
||
function readURL() {
|
||
|
||
var hash = window.location.hash;
|
||
|
||
// Attempt to parse the hash as either an index or name
|
||
var bits = hash.slice( 2 ).split( '/' ),
|
||
name = hash.replace( /#|\//gi, '' );
|
||
|
||
// If the first bit is invalid and there is a name we can
|
||
// assume that this is a named link
|
||
if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
|
||
var element;
|
||
|
||
// Ensure the named link is a valid HTML ID attribute
|
||
if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) {
|
||
// Find the slide with the specified ID
|
||
element = document.getElementById( name );
|
||
}
|
||
|
||
if( element ) {
|
||
// Find the position of the named slide and navigate to it
|
||
var indices = Reveal.getIndices( element );
|
||
slide( indices.h, indices.v );
|
||
}
|
||
// If the slide doesn't exist, navigate to the current slide
|
||
else {
|
||
slide( indexh || 0, indexv || 0 );
|
||
}
|
||
}
|
||
else {
|
||
// Read the index components of the hash
|
||
var h = parseInt( bits[0], 10 ) || 0,
|
||
v = parseInt( bits[1], 10 ) || 0;
|
||
|
||
if( h !== indexh || v !== indexv ) {
|
||
slide( h, v );
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Updates the page URL (hash) to reflect the current
|
||
* state.
|
||
*
|
||
* @param {Number} delay The time in ms to wait before
|
||
* writing the hash
|
||
*/
|
||
function writeURL( delay ) {
|
||
|
||
if( config.history ) {
|
||
|
||
// Make sure there's never more than one timeout running
|
||
clearTimeout( writeURLTimeout );
|
||
|
||
// If a delay is specified, timeout this call
|
||
if( typeof delay === 'number' ) {
|
||
writeURLTimeout = setTimeout( writeURL, delay );
|
||
}
|
||
else if( currentSlide ) {
|
||
var url = '/';
|
||
|
||
// Attempt to create a named link based on the slide's ID
|
||
var id = currentSlide.getAttribute( 'id' );
|
||
if( id ) {
|
||
id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' );
|
||
}
|
||
|
||
// If the current slide has an ID, use that as a named link
|
||
if( typeof id === 'string' && id.length ) {
|
||
url = '/' + id;
|
||
}
|
||
// Otherwise use the /h/v index
|
||
else {
|
||
if( indexh > 0 || indexv > 0 ) url += indexh;
|
||
if( indexv > 0 ) url += '/' + indexv;
|
||
}
|
||
|
||
window.location.hash = url;
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Retrieves the h/v location of the current, or specified,
|
||
* slide.
|
||
*
|
||
* @param {HTMLElement} slide If specified, the returned
|
||
* index will be for this slide rather than the currently
|
||
* active one
|
||
*
|
||
* @return {Object} { h: <int>, v: <int>, f: <int> }
|
||
*/
|
||
function getIndices( slide ) {
|
||
|
||
// By default, return the current indices
|
||
var h = indexh,
|
||
v = indexv,
|
||
f;
|
||
|
||
// If a slide is specified, return the indices of that slide
|
||
if( slide ) {
|
||
var isVertical = isVerticalSlide( slide );
|
||
var slideh = isVertical ? slide.parentNode : slide;
|
||
|
||
// Select all horizontal slides
|
||
var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
|
||
|
||
// Now that we know which the horizontal slide is, get its index
|
||
h = Math.max( horizontalSlides.indexOf( slideh ), 0 );
|
||
|
||
// Assume we're not vertical
|
||
v = undefined;
|
||
|
||
// If this is a vertical slide, grab the vertical index
|
||
if( isVertical ) {
|
||
v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
|
||
}
|
||
}
|
||
|
||
if( !slide && currentSlide ) {
|
||
var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
|
||
if( hasFragments ) {
|
||
var currentFragment = currentSlide.querySelector( '.current-fragment' );
|
||
if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {
|
||
f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );
|
||
}
|
||
else {
|
||
f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;
|
||
}
|
||
}
|
||
}
|
||
|
||
return { h: h, v: v, f: f };
|
||
|
||
}
|
||
|
||
/**
|
||
* Retrieves the total number of slides in this presentation.
|
||
*/
|
||
function getTotalSlides() {
|
||
|
||
return dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns the slide element matching the specified index.
|
||
*/
|
||
function getSlide( x, y ) {
|
||
|
||
var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
|
||
var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
|
||
|
||
if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
|
||
return verticalSlides ? verticalSlides[ y ] : undefined;
|
||
}
|
||
|
||
return horizontalSlide;
|
||
|
||
}
|
||
|
||
/**
|
||
* Returns the background element for the given slide.
|
||
* All slides, even the ones with no background properties
|
||
* defined, have a background element so as long as the
|
||
* index is valid an element will be returned.
|
||
*/
|
||
function getSlideBackground( x, y ) {
|
||
|
||
// When printing to PDF the slide backgrounds are nested
|
||
// inside of the slides
|
||
if( isPrintingPDF() ) {
|
||
var slide = getSlide( x, y );
|
||
if( slide ) {
|
||
var background = slide.querySelector( '.slide-background' );
|
||
if( background && background.parentNode === slide ) {
|
||
return background;
|
||
}
|
||
}
|
||
|
||
return undefined;
|
||
}
|
||
|
||
var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
|
||
var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
|
||
|
||
if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
|
||
return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
|
||
}
|
||
|
||
return horizontalBackground;
|
||
|
||
}
|
||
|
||
/**
|
||
* Retrieves the speaker notes from a slide. Notes can be
|
||
* defined in two ways:
|
||
* 1. As a data-notes attribute on the slide <section>
|
||
* 2. As an <aside class="notes"> inside of the slide
|
||
*/
|
||
function getSlideNotes( slide ) {
|
||
|
||
// Default to the current slide
|
||
slide = slide || currentSlide;
|
||
|
||
// Notes can be specified via the data-notes attribute...
|
||
if( slide.hasAttribute( 'data-notes' ) ) {
|
||
return slide.getAttribute( 'data-notes' );
|
||
}
|
||
|
||
// ... or using an <aside class="notes"> element
|
||
var notesElement = slide.querySelector( 'aside.notes' );
|
||
if( notesElement ) {
|
||
return notesElement.innerHTML;
|
||
}
|
||
|
||
return null;
|
||
|
||
}
|
||
|
||
/**
|
||
* Retrieves the current state of the presentation as
|
||
* an object. This state can then be restored at any
|
||
* time.
|
||
*/
|
||
function getState() {
|
||
|
||
var indices = getIndices();
|
||
|
||
return {
|
||
indexh: indices.h,
|
||
indexv: indices.v,
|
||
indexf: indices.f,
|
||
paused: isPaused(),
|
||
overview: isOverview()
|
||
};
|
||
|
||
}
|
||
|
||
/**
|
||
* Restores the presentation to the given state.
|
||
*
|
||
* @param {Object} state As generated by getState()
|
||
*/
|
||
function setState( state ) {
|
||
|
||
if( typeof state === 'object' ) {
|
||
slide( deserialize( state.indexh ), deserialize( state.indexv ), deserialize( state.indexf ) );
|
||
|
||
var pausedFlag = deserialize( state.paused ),
|
||
overviewFlag = deserialize( state.overview );
|
||
|
||
if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
|
||
togglePause( pausedFlag );
|
||
}
|
||
|
||
if( typeof overviewFlag === 'boolean' && overviewFlag !== isOverview() ) {
|
||
toggleOverview( overviewFlag );
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Return a sorted fragments list, ordered by an increasing
|
||
* "data-fragment-index" attribute.
|
||
*
|
||
* Fragments will be revealed in the order that they are returned by
|
||
* this function, so you can use the index attributes to control the
|
||
* order of fragment appearance.
|
||
*
|
||
* To maintain a sensible default fragment order, fragments are presumed
|
||
* to be passed in document order. This function adds a "fragment-index"
|
||
* attribute to each node if such an attribute is not already present,
|
||
* and sets that attribute to an integer value which is the position of
|
||
* the fragment within the fragments list.
|
||
*/
|
||
function sortFragments( fragments ) {
|
||
|
||
fragments = toArray( fragments );
|
||
|
||
var ordered = [],
|
||
unordered = [],
|
||
sorted = [];
|
||
|
||
// Group ordered and unordered elements
|
||
fragments.forEach( function( fragment, i ) {
|
||
if( fragment.hasAttribute( 'data-fragment-index' ) ) {
|
||
var index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );
|
||
|
||
if( !ordered[index] ) {
|
||
ordered[index] = [];
|
||
}
|
||
|
||
ordered[index].push( fragment );
|
||
}
|
||
else {
|
||
unordered.push( [ fragment ] );
|
||
}
|
||
} );
|
||
|
||
// Append fragments without explicit indices in their
|
||
// DOM order
|
||
ordered = ordered.concat( unordered );
|
||
|
||
// Manually count the index up per group to ensure there
|
||
// are no gaps
|
||
var index = 0;
|
||
|
||
// Push all fragments in their sorted order to an array,
|
||
// this flattens the groups
|
||
ordered.forEach( function( group ) {
|
||
group.forEach( function( fragment ) {
|
||
sorted.push( fragment );
|
||
fragment.setAttribute( 'data-fragment-index', index );
|
||
} );
|
||
|
||
index ++;
|
||
} );
|
||
|
||
return sorted;
|
||
|
||
}
|
||
|
||
/**
|
||
* Navigate to the specified slide fragment.
|
||
*
|
||
* @param {Number} index The index of the fragment that
|
||
* should be shown, -1 means all are invisible
|
||
* @param {Number} offset Integer offset to apply to the
|
||
* fragment index
|
||
*
|
||
* @return {Boolean} true if a change was made in any
|
||
* fragments visibility as part of this call
|
||
*/
|
||
function navigateFragment( index, offset ) {
|
||
|
||
if( currentSlide && config.fragments ) {
|
||
|
||
var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
|
||
if( fragments.length ) {
|
||
|
||
// If no index is specified, find the current
|
||
if( typeof index !== 'number' ) {
|
||
var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
|
||
|
||
if( lastVisibleFragment ) {
|
||
index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
|
||
}
|
||
else {
|
||
index = -1;
|
||
}
|
||
}
|
||
|
||
// If an offset is specified, apply it to the index
|
||
if( typeof offset === 'number' ) {
|
||
index += offset;
|
||
}
|
||
|
||
var fragmentsShown = [],
|
||
fragmentsHidden = [];
|
||
|
||
toArray( fragments ).forEach( function( element, i ) {
|
||
|
||
if( element.hasAttribute( 'data-fragment-index' ) ) {
|
||
i = parseInt( element.getAttribute( 'data-fragment-index' ), 10 );
|
||
}
|
||
|
||
// Visible fragments
|
||
if( i <= index ) {
|
||
if( !element.classList.contains( 'visible' ) ) fragmentsShown.push( element );
|
||
element.classList.add( 'visible' );
|
||
element.classList.remove( 'current-fragment' );
|
||
|
||
// Announce the fragments one by one to the Screen Reader
|
||
dom.statusDiv.textContent = element.textContent;
|
||
|
||
if( i === index ) {
|
||
element.classList.add( 'current-fragment' );
|
||
}
|
||
}
|
||
// Hidden fragments
|
||
else {
|
||
if( element.classList.contains( 'visible' ) ) fragmentsHidden.push( element );
|
||
element.classList.remove( 'visible' );
|
||
element.classList.remove( 'current-fragment' );
|
||
}
|
||
|
||
|
||
} );
|
||
|
||
if( fragmentsHidden.length ) {
|
||
dispatchEvent( 'fragmenthidden', { fragment: fragmentsHidden[0], fragments: fragmentsHidden } );
|
||
}
|
||
|
||
if( fragmentsShown.length ) {
|
||
dispatchEvent( 'fragmentshown', { fragment: fragmentsShown[0], fragments: fragmentsShown } );
|
||
}
|
||
|
||
updateControls();
|
||
updateProgress();
|
||
|
||
return !!( fragmentsShown.length || fragmentsHidden.length );
|
||
|
||
}
|
||
|
||
}
|
||
|
||
return false;
|
||
|
||
}
|
||
|
||
/**
|
||
* Navigate to the next slide fragment.
|
||
*
|
||
* @return {Boolean} true if there was a next fragment,
|
||
* false otherwise
|
||
*/
|
||
function nextFragment() {
|
||
|
||
return navigateFragment( null, 1 );
|
||
|
||
}
|
||
|
||
/**
|
||
* Navigate to the previous slide fragment.
|
||
*
|
||
* @return {Boolean} true if there was a previous fragment,
|
||
* false otherwise
|
||
*/
|
||
function previousFragment() {
|
||
|
||
return navigateFragment( null, -1 );
|
||
|
||
}
|
||
|
||
/**
|
||
* Cues a new automated slide if enabled in the config.
|
||
*/
|
||
function cueAutoSlide() {
|
||
|
||
cancelAutoSlide();
|
||
|
||
if( currentSlide ) {
|
||
|
||
var currentFragment = currentSlide.querySelector( '.current-fragment' );
|
||
|
||
var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null;
|
||
var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
|
||
var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );
|
||
|
||
// Pick value in the following priority order:
|
||
// 1. Current fragment's data-autoslide
|
||
// 2. Current slide's data-autoslide
|
||
// 3. Parent slide's data-autoslide
|
||
// 4. Global autoSlide setting
|
||
if( fragmentAutoSlide ) {
|
||
autoSlide = parseInt( fragmentAutoSlide, 10 );
|
||
}
|
||
else if( slideAutoSlide ) {
|
||
autoSlide = parseInt( slideAutoSlide, 10 );
|
||
}
|
||
else if( parentAutoSlide ) {
|
||
autoSlide = parseInt( parentAutoSlide, 10 );
|
||
}
|
||
else {
|
||
autoSlide = config.autoSlide;
|
||
}
|
||
|
||
// If there are media elements with data-autoplay,
|
||
// automatically set the autoSlide duration to the
|
||
// length of that media. Not applicable if the slide
|
||
// is divided up into fragments.
|
||
if( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {
|
||
toArray( currentSlide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
|
||
if( el.hasAttribute( 'data-autoplay' ) ) {
|
||
if( autoSlide && el.duration * 1000 > autoSlide ) {
|
||
autoSlide = ( el.duration * 1000 ) + 1000;
|
||
}
|
||
}
|
||
} );
|
||
}
|
||
|
||
// Cue the next auto-slide if:
|
||
// - There is an autoSlide value
|
||
// - Auto-sliding isn't paused by the user
|
||
// - The presentation isn't paused
|
||
// - The overview isn't active
|
||
// - The presentation isn't over
|
||
if( autoSlide && !autoSlidePaused && !isPaused() && !isOverview() && ( !Reveal.isLastSlide() || availableFragments().next || config.loop === true ) ) {
|
||
autoSlideTimeout = setTimeout( function() {
|
||
typeof config.autoSlideMethod === 'function' ? config.autoSlideMethod() : navigateNext();
|
||
cueAutoSlide();
|
||
}, autoSlide );
|
||
autoSlideStartTime = Date.now();
|
||
}
|
||
|
||
if( autoSlidePlayer ) {
|
||
autoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );
|
||
}
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Cancels any ongoing request to auto-slide.
|
||
*/
|
||
function cancelAutoSlide() {
|
||
|
||
clearTimeout( autoSlideTimeout );
|
||
autoSlideTimeout = -1;
|
||
|
||
}
|
||
|
||
function pauseAutoSlide() {
|
||
|
||
if( autoSlide && !autoSlidePaused ) {
|
||
autoSlidePaused = true;
|
||
dispatchEvent( 'autoslidepaused' );
|
||
clearTimeout( autoSlideTimeout );
|
||
|
||
if( autoSlidePlayer ) {
|
||
autoSlidePlayer.setPlaying( false );
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
function resumeAutoSlide() {
|
||
|
||
if( autoSlide && autoSlidePaused ) {
|
||
autoSlidePaused = false;
|
||
dispatchEvent( 'autoslideresumed' );
|
||
cueAutoSlide();
|
||
}
|
||
|
||
}
|
||
|
||
function navigateLeft() {
|
||
|
||
// Reverse for RTL
|
||
if( config.rtl ) {
|
||
if( ( isOverview() || nextFragment() === false ) && availableRoutes().left ) {
|
||
slide( indexh + 1 );
|
||
}
|
||
}
|
||
// Normal navigation
|
||
else if( ( isOverview() || previousFragment() === false ) && availableRoutes().left ) {
|
||
slide( indexh - 1 );
|
||
}
|
||
|
||
}
|
||
|
||
function navigateRight() {
|
||
|
||
// Reverse for RTL
|
||
if( config.rtl ) {
|
||
if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
|
||
slide( indexh - 1 );
|
||
}
|
||
}
|
||
// Normal navigation
|
||
else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
|
||
slide( indexh + 1 );
|
||
}
|
||
|
||
}
|
||
|
||
function navigateUp() {
|
||
|
||
// Prioritize hiding fragments
|
||
if( ( isOverview() || previousFragment() === false ) && availableRoutes().up ) {
|
||
slide( indexh, indexv - 1 );
|
||
}
|
||
|
||
}
|
||
|
||
function navigateDown() {
|
||
|
||
// Prioritize revealing fragments
|
||
if( ( isOverview() || nextFragment() === false ) && availableRoutes().down ) {
|
||
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;
|
||
|
||
if( config.rtl ) {
|
||
previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.future' ) ).pop();
|
||
}
|
||
else {
|
||
previousSlide = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.past' ) ).pop();
|
||
}
|
||
|
||
if( previousSlide ) {
|
||
var v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
|
||
var h = indexh - 1;
|
||
slide( h, v );
|
||
}
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* The reverse of #navigatePrev().
|
||
*/
|
||
function navigateNext() {
|
||
|
||
// Prioritize revealing fragments
|
||
if( nextFragment() === false ) {
|
||
if( availableRoutes().down ) {
|
||
navigateDown();
|
||
}
|
||
else if( config.rtl ) {
|
||
navigateLeft();
|
||
}
|
||
else {
|
||
navigateRight();
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Checks if the target element prevents the triggering of
|
||
* swipe navigation.
|
||
*/
|
||
function isSwipePrevented( target ) {
|
||
|
||
while( target && typeof target.hasAttribute === 'function' ) {
|
||
if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
|
||
target = target.parentNode;
|
||
}
|
||
|
||
return false;
|
||
|
||
}
|
||
|
||
|
||
// --------------------------------------------------------------------//
|
||
// ----------------------------- EVENTS -------------------------------//
|
||
// --------------------------------------------------------------------//
|
||
|
||
/**
|
||
* Called by all event handlers that are based on user
|
||
* input.
|
||
*/
|
||
function onUserInput( event ) {
|
||
|
||
if( config.autoSlideStoppable ) {
|
||
pauseAutoSlide();
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Handler for the document level 'keypress' event.
|
||
*/
|
||
function onDocumentKeyPress( event ) {
|
||
|
||
// Check if the pressed key is question mark
|
||
if( event.shiftKey && event.charCode === 63 ) {
|
||
if( dom.overlay ) {
|
||
closeOverlay();
|
||
}
|
||
else {
|
||
showHelp( true );
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Handler for the document level 'keydown' event.
|
||
*/
|
||
function onDocumentKeyDown( event ) {
|
||
|
||
// If there's a condition specified and it returns false,
|
||
// ignore this event
|
||
if( typeof config.keyboardCondition === 'function' && config.keyboardCondition() === false ) {
|
||
return true;
|
||
}
|
||
|
||
// Remember if auto-sliding was paused so we can toggle it
|
||
var autoSlideWasPaused = autoSlidePaused;
|
||
|
||
onUserInput( event );
|
||
|
||
// Check if there's a focused element that could be using
|
||
// the keyboard
|
||
var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit';
|
||
var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
|
||
|
||
// Disregard the event if there's a focused element or a
|
||
// keyboard modifier key is present
|
||
if( activeElementIsCE || activeElementIsInput || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return;
|
||
|
||
// While paused only allow resume keyboard events; 'b', '.''
|
||
var resumeKeyCodes = [66,190,191];
|
||
var key;
|
||
|
||
// Custom key bindings for togglePause should be able to resume
|
||
if( typeof config.keyboard === 'object' ) {
|
||
for( key in config.keyboard ) {
|
||
if( config.keyboard[key] === 'togglePause' ) {
|
||
resumeKeyCodes.push( parseInt( key, 10 ) );
|
||
}
|
||
}
|
||
}
|
||
|
||
if( isPaused() && resumeKeyCodes.indexOf( event.keyCode ) === -1 ) {
|
||
return false;
|
||
}
|
||
|
||
var triggered = false;
|
||
|
||
// 1. User defined key bindings
|
||
if( typeof config.keyboard === 'object' ) {
|
||
|
||
for( key in config.keyboard ) {
|
||
|
||
// Check if this binding matches the pressed key
|
||
if( parseInt( key, 10 ) === event.keyCode ) {
|
||
|
||
var value = config.keyboard[ key ];
|
||
|
||
// Callback function
|
||
if( typeof value === 'function' ) {
|
||
value.apply( null, [ event ] );
|
||
}
|
||
// String shortcuts to reveal.js API
|
||
else if( typeof value === 'string' && typeof Reveal[ value ] === 'function' ) {
|
||
Reveal[ value ].call();
|
||
}
|
||
|
||
triggered = true;
|
||
|
||
}
|
||
|
||
}
|
||
|
||
}
|
||
|
||
// 2. System defined key bindings
|
||
if( triggered === false ) {
|
||
|
||
// Assume true and try to prove false
|
||
triggered = true;
|
||
|
||
switch( event.keyCode ) {
|
||
// p, page up
|
||
case 80: case 33: navigatePrev(); break;
|
||
// n, page down
|
||
case 78: case 34: navigateNext(); break;
|
||
// h, left
|
||
case 72: case 37: navigateLeft(); break;
|
||
// l, right
|
||
case 76: case 39: navigateRight(); break;
|
||
// k, up
|
||
case 75: case 38: navigateUp(); break;
|
||
// j, down
|
||
case 74: case 40: navigateDown(); break;
|
||
// home
|
||
case 36: slide( 0 ); break;
|
||
// end
|
||
case 35: slide( Number.MAX_VALUE ); break;
|
||
// space
|
||
case 32: isOverview() ? deactivateOverview() : event.shiftKey ? navigatePrev() : navigateNext(); break;
|
||
// return
|
||
case 13: isOverview() ? deactivateOverview() : triggered = false; break;
|
||
// two-spot, semicolon, b, period, Logitech presenter tools "black screen" button
|
||
case 58: case 59: case 66: case 190: case 191: togglePause(); break;
|
||
// f
|
||
case 70: enterFullscreen(); break;
|
||
// a
|
||
case 65: if ( config.autoSlideStoppable ) toggleAutoSlide( autoSlideWasPaused ); break;
|
||
default:
|
||
triggered = false;
|
||
}
|
||
|
||
}
|
||
|
||
// If the input resulted in a triggered action we should prevent
|
||
// the browsers default behavior
|
||
if( triggered ) {
|
||
event.preventDefault && event.preventDefault();
|
||
}
|
||
// ESC or O key
|
||
else if ( ( event.keyCode === 27 || event.keyCode === 79 ) && features.transforms3d ) {
|
||
if( dom.overlay ) {
|
||
closeOverlay();
|
||
}
|
||
else {
|
||
toggleOverview();
|
||
}
|
||
|
||
event.preventDefault && event.preventDefault();
|
||
}
|
||
|
||
// If auto-sliding is enabled we need to cue up
|
||
// another timeout
|
||
cueAutoSlide();
|
||
|
||
}
|
||
|
||
/**
|
||
* Handler for the 'touchstart' event, enables support for
|
||
* swipe and pinch gestures.
|
||
*/
|
||
function onTouchStart( event ) {
|
||
|
||
if( isSwipePrevented( event.target ) ) return true;
|
||
|
||
touch.startX = event.touches[0].clientX;
|
||
touch.startY = event.touches[0].clientY;
|
||
touch.startCount = event.touches.length;
|
||
|
||
// If there's two touches we need to memorize the distance
|
||
// between those two points to detect pinching
|
||
if( event.touches.length === 2 && config.overview ) {
|
||
touch.startSpan = distanceBetween( {
|
||
x: event.touches[1].clientX,
|
||
y: event.touches[1].clientY
|
||
}, {
|
||
x: touch.startX,
|
||
y: touch.startY
|
||
} );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Handler for the 'touchmove' event.
|
||
*/
|
||
function onTouchMove( event ) {
|
||
|
||
if( isSwipePrevented( event.target ) ) return true;
|
||
|
||
// Each touch should only trigger one action
|
||
if( !touch.captured ) {
|
||
onUserInput( event );
|
||
|
||
var currentX = event.touches[0].clientX;
|
||
var currentY = event.touches[0].clientY;
|
||
|
||
// If the touch started with two points and still has
|
||
// two active touches; test for the pinch gesture
|
||
if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {
|
||
|
||
// The current distance in pixels between the two touch points
|
||
var currentSpan = distanceBetween( {
|
||
x: event.touches[1].clientX,
|
||
y: event.touches[1].clientY
|
||
}, {
|
||
x: touch.startX,
|
||
y: touch.startY
|
||
} );
|
||
|
||
// If the span is larger than the desire amount we've got
|
||
// ourselves a pinch
|
||
if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
|
||
touch.captured = true;
|
||
|
||
if( currentSpan < touch.startSpan ) {
|
||
activateOverview();
|
||
}
|
||
else {
|
||
deactivateOverview();
|
||
}
|
||
}
|
||
|
||
event.preventDefault();
|
||
|
||
}
|
||
// There was only one touch point, look for a swipe
|
||
else if( event.touches.length === 1 && touch.startCount !== 2 ) {
|
||
|
||
var deltaX = currentX - touch.startX,
|
||
deltaY = currentY - touch.startY;
|
||
|
||
if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
|
||
touch.captured = true;
|
||
navigateLeft();
|
||
}
|
||
else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
|
||
touch.captured = true;
|
||
navigateRight();
|
||
}
|
||
else if( deltaY > touch.threshold ) {
|
||
touch.captured = true;
|
||
navigateUp();
|
||
}
|
||
else if( deltaY < -touch.threshold ) {
|
||
touch.captured = true;
|
||
navigateDown();
|
||
}
|
||
|
||
// If we're embedded, only block touch events if they have
|
||
// triggered an action
|
||
if( config.embedded ) {
|
||
if( touch.captured || isVerticalSlide( currentSlide ) ) {
|
||
event.preventDefault();
|
||
}
|
||
}
|
||
// Not embedded? Block them all to avoid needless tossing
|
||
// around of the viewport in iOS
|
||
else {
|
||
event.preventDefault();
|
||
}
|
||
|
||
}
|
||
}
|
||
// There's a bug with swiping on some Android devices unless
|
||
// the default action is always prevented
|
||
else if( UA.match( /android/gi ) ) {
|
||
event.preventDefault();
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Handler for the 'touchend' event.
|
||
*/
|
||
function onTouchEnd( event ) {
|
||
|
||
touch.captured = false;
|
||
|
||
}
|
||
|
||
/**
|
||
* Convert pointer down to touch start.
|
||
*/
|
||
function onPointerDown( event ) {
|
||
|
||
if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
|
||
event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
|
||
onTouchStart( event );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Convert pointer move to touch move.
|
||
*/
|
||
function onPointerMove( event ) {
|
||
|
||
if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
|
||
event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
|
||
onTouchMove( event );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Convert pointer up to touch end.
|
||
*/
|
||
function onPointerUp( event ) {
|
||
|
||
if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
|
||
event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
|
||
onTouchEnd( event );
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Handles mouse wheel scrolling, throttled to avoid skipping
|
||
* multiple slides.
|
||
*/
|
||
function onDocumentMouseScroll( event ) {
|
||
|
||
if( Date.now() - lastMouseWheelStep > 600 ) {
|
||
|
||
lastMouseWheelStep = Date.now();
|
||
|
||
var delta = event.detail || -event.wheelDelta;
|
||
if( delta > 0 ) {
|
||
navigateNext();
|
||
}
|
||
else {
|
||
navigatePrev();
|
||
}
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Clicking on the progress bar results in a navigation to the
|
||
* closest approximate horizontal slide using this equation:
|
||
*
|
||
* ( clickX / presentationWidth ) * numberOfSlides
|
||
*/
|
||
function onProgressClicked( event ) {
|
||
|
||
onUserInput( event );
|
||
|
||
event.preventDefault();
|
||
|
||
var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
|
||
var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );
|
||
|
||
if( config.rtl ) {
|
||
slideIndex = slidesTotal - slideIndex;
|
||
}
|
||
|
||
slide( slideIndex );
|
||
|
||
}
|
||
|
||
/**
|
||
* Event handler for navigation control buttons.
|
||
*/
|
||
function onNavigateLeftClicked( event ) { event.preventDefault(); onUserInput(); navigateLeft(); }
|
||
function onNavigateRightClicked( event ) { event.preventDefault(); onUserInput(); navigateRight(); }
|
||
function onNavigateUpClicked( event ) { event.preventDefault(); onUserInput(); navigateUp(); }
|
||
function onNavigateDownClicked( event ) { event.preventDefault(); onUserInput(); navigateDown(); }
|
||
function onNavigatePrevClicked( event ) { event.preventDefault(); onUserInput(); navigatePrev(); }
|
||
function onNavigateNextClicked( event ) { event.preventDefault(); onUserInput(); navigateNext(); }
|
||
|
||
/**
|
||
* Handler for the window level 'hashchange' event.
|
||
*/
|
||
function onWindowHashChange( event ) {
|
||
|
||
readURL();
|
||
|
||
}
|
||
|
||
/**
|
||
* Handler for the window level 'resize' event.
|
||
*/
|
||
function onWindowResize( event ) {
|
||
|
||
layout();
|
||
|
||
}
|
||
|
||
/**
|
||
* Handle for the window level 'visibilitychange' event.
|
||
*/
|
||
function onPageVisibilityChange( event ) {
|
||
|
||
var isHidden = document.webkitHidden ||
|
||
document.msHidden ||
|
||
document.hidden;
|
||
|
||
// If, after clicking a link or similar and we're coming back,
|
||
// focus the document.body to ensure we can use keyboard shortcuts
|
||
if( isHidden === false && document.activeElement !== document.body ) {
|
||
// Not all elements support .blur() - SVGs among them.
|
||
if( typeof document.activeElement.blur === 'function' ) {
|
||
document.activeElement.blur();
|
||
}
|
||
document.body.focus();
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Invoked when a slide is and we're in the overview.
|
||
*/
|
||
function onOverviewSlideClicked( event ) {
|
||
|
||
// TODO There's a bug here where the event listeners are not
|
||
// removed after deactivating the overview.
|
||
if( eventsAreBound && isOverview() ) {
|
||
event.preventDefault();
|
||
|
||
var element = event.target;
|
||
|
||
while( element && !element.nodeName.match( /section/gi ) ) {
|
||
element = element.parentNode;
|
||
}
|
||
|
||
if( element && !element.classList.contains( 'disabled' ) ) {
|
||
|
||
deactivateOverview();
|
||
|
||
if( element.nodeName.match( /section/gi ) ) {
|
||
var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
|
||
v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
|
||
|
||
slide( h, v );
|
||
}
|
||
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Handles clicks on links that are set to preview in the
|
||
* iframe overlay.
|
||
*/
|
||
function onPreviewLinkClicked( event ) {
|
||
|
||
if( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {
|
||
var url = event.currentTarget.getAttribute( 'href' );
|
||
if( url ) {
|
||
showPreview( url );
|
||
event.preventDefault();
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Handles click on the auto-sliding controls element.
|
||
*/
|
||
function onAutoSlidePlayerClick( event ) {
|
||
|
||
// Replay
|
||
if( Reveal.isLastSlide() && config.loop === false ) {
|
||
slide( 0, 0 );
|
||
resumeAutoSlide();
|
||
}
|
||
// Resume
|
||
else if( autoSlidePaused ) {
|
||
resumeAutoSlide();
|
||
}
|
||
// Pause
|
||
else {
|
||
pauseAutoSlide();
|
||
}
|
||
|
||
}
|
||
|
||
|
||
// --------------------------------------------------------------------//
|
||
// ------------------------ PLAYBACK COMPONENT ------------------------//
|
||
// --------------------------------------------------------------------//
|
||
|
||
|
||
/**
|
||
* Constructor for the playback component, which displays
|
||
* play/pause/progress controls.
|
||
*
|
||
* @param {HTMLElement} container The component will append
|
||
* itself to this
|
||
* @param {Function} progressCheck A method which will be
|
||
* called frequently to get the current progress on a range
|
||
* of 0-1
|
||
*/
|
||
function Playback( container, progressCheck ) {
|
||
|
||
// Cosmetics
|
||
this.diameter = 100;
|
||
this.diameter2 = this.diameter/2;
|
||
this.thickness = 6;
|
||
|
||
// Flags if we are currently playing
|
||
this.playing = false;
|
||
|
||
// Current progress on a 0-1 range
|
||
this.progress = 0;
|
||
|
||
// Used to loop the animation smoothly
|
||
this.progressOffset = 1;
|
||
|
||
this.container = container;
|
||
this.progressCheck = progressCheck;
|
||
|
||
this.canvas = document.createElement( 'canvas' );
|
||
this.canvas.className = 'playback';
|
||
this.canvas.width = this.diameter;
|
||
this.canvas.height = this.diameter;
|
||
this.canvas.style.width = this.diameter2 + 'px';
|
||
this.canvas.style.height = this.diameter2 + 'px';
|
||
this.context = this.canvas.getContext( '2d' );
|
||
|
||
this.container.appendChild( this.canvas );
|
||
|
||
this.render();
|
||
|
||
}
|
||
|
||
Playback.prototype.setPlaying = function( value ) {
|
||
|
||
var wasPlaying = this.playing;
|
||
|
||
this.playing = value;
|
||
|
||
// Start repainting if we weren't already
|
||
if( !wasPlaying && this.playing ) {
|
||
this.animate();
|
||
}
|
||
else {
|
||
this.render();
|
||
}
|
||
|
||
};
|
||
|
||
Playback.prototype.animate = function() {
|
||
|
||
var progressBefore = this.progress;
|
||
|
||
this.progress = this.progressCheck();
|
||
|
||
// When we loop, offset the progress so that it eases
|
||
// smoothly rather than immediately resetting
|
||
if( progressBefore > 0.8 && this.progress < 0.2 ) {
|
||
this.progressOffset = this.progress;
|
||
}
|
||
|
||
this.render();
|
||
|
||
if( this.playing ) {
|
||
features.requestAnimationFrameMethod.call( window, this.animate.bind( this ) );
|
||
}
|
||
|
||
};
|
||
|
||
/**
|
||
* Renders the current progress and playback state.
|
||
*/
|
||
Playback.prototype.render = function() {
|
||
|
||
var progress = this.playing ? this.progress : 0,
|
||
radius = ( this.diameter2 ) - this.thickness,
|
||
x = this.diameter2,
|
||
y = this.diameter2,
|
||
iconSize = 28;
|
||
|
||
// Ease towards 1
|
||
this.progressOffset += ( 1 - this.progressOffset ) * 0.1;
|
||
|
||
var endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
|
||
var startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );
|
||
|
||
this.context.save();
|
||
this.context.clearRect( 0, 0, this.diameter, this.diameter );
|
||
|
||
// Solid background color
|
||
this.context.beginPath();
|
||
this.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );
|
||
this.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';
|
||
this.context.fill();
|
||
|
||
// Draw progress track
|
||
this.context.beginPath();
|
||
this.context.arc( x, y, radius, 0, Math.PI * 2, false );
|
||
this.context.lineWidth = this.thickness;
|
||
this.context.strokeStyle = '#666';
|
||
this.context.stroke();
|
||
|
||
if( this.playing ) {
|
||
// Draw progress on top of track
|
||
this.context.beginPath();
|
||
this.context.arc( x, y, radius, startAngle, endAngle, false );
|
||
this.context.lineWidth = this.thickness;
|
||
this.context.strokeStyle = '#fff';
|
||
this.context.stroke();
|
||
}
|
||
|
||
this.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );
|
||
|
||
// Draw play/pause icons
|
||
if( this.playing ) {
|
||
this.context.fillStyle = '#fff';
|
||
this.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );
|
||
this.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );
|
||
}
|
||
else {
|
||
this.context.beginPath();
|
||
this.context.translate( 4, 0 );
|
||
this.context.moveTo( 0, 0 );
|
||
this.context.lineTo( iconSize - 4, iconSize / 2 );
|
||
this.context.lineTo( 0, iconSize );
|
||
this.context.fillStyle = '#fff';
|
||
this.context.fill();
|
||
}
|
||
|
||
this.context.restore();
|
||
|
||
};
|
||
|
||
Playback.prototype.on = function( type, listener ) {
|
||
this.canvas.addEventListener( type, listener, false );
|
||
};
|
||
|
||
Playback.prototype.off = function( type, listener ) {
|
||
this.canvas.removeEventListener( type, listener, false );
|
||
};
|
||
|
||
Playback.prototype.destroy = function() {
|
||
|
||
this.playing = false;
|
||
|
||
if( this.canvas.parentNode ) {
|
||
this.container.removeChild( this.canvas );
|
||
}
|
||
|
||
};
|
||
|
||
|
||
// --------------------------------------------------------------------//
|
||
// ------------------------------- API --------------------------------//
|
||
// --------------------------------------------------------------------//
|
||
|
||
|
||
Reveal = {
|
||
VERSION: VERSION,
|
||
|
||
initialize: initialize,
|
||
configure: configure,
|
||
sync: sync,
|
||
|
||
// Navigation methods
|
||
slide: slide,
|
||
left: navigateLeft,
|
||
right: navigateRight,
|
||
up: navigateUp,
|
||
down: navigateDown,
|
||
prev: navigatePrev,
|
||
next: navigateNext,
|
||
|
||
// Fragment methods
|
||
navigateFragment: navigateFragment,
|
||
prevFragment: previousFragment,
|
||
nextFragment: nextFragment,
|
||
|
||
// Deprecated aliases
|
||
navigateTo: slide,
|
||
navigateLeft: navigateLeft,
|
||
navigateRight: navigateRight,
|
||
navigateUp: navigateUp,
|
||
navigateDown: navigateDown,
|
||
navigatePrev: navigatePrev,
|
||
navigateNext: navigateNext,
|
||
|
||
// Forces an update in slide layout
|
||
layout: layout,
|
||
|
||
// Randomizes the order of slides
|
||
shuffle: shuffle,
|
||
|
||
// Returns an object with the available routes as booleans (left/right/top/bottom)
|
||
availableRoutes: availableRoutes,
|
||
|
||
// Returns an object with the available fragments as booleans (prev/next)
|
||
availableFragments: availableFragments,
|
||
|
||
// Toggles the overview mode on/off
|
||
toggleOverview: toggleOverview,
|
||
|
||
// Toggles the "black screen" mode on/off
|
||
togglePause: togglePause,
|
||
|
||
// Toggles the auto slide mode on/off
|
||
toggleAutoSlide: toggleAutoSlide,
|
||
|
||
// State checks
|
||
isOverview: isOverview,
|
||
isPaused: isPaused,
|
||
isAutoSliding: isAutoSliding,
|
||
|
||
// Adds or removes all internal event listeners (such as keyboard)
|
||
addEventListeners: addEventListeners,
|
||
removeEventListeners: removeEventListeners,
|
||
|
||
// Facility for persisting and restoring the presentation state
|
||
getState: getState,
|
||
setState: setState,
|
||
|
||
// Presentation progress on range of 0-1
|
||
getProgress: getProgress,
|
||
|
||
// Returns the indices of the current, or specified, slide
|
||
getIndices: getIndices,
|
||
|
||
getTotalSlides: getTotalSlides,
|
||
|
||
// Returns the slide element at the specified index
|
||
getSlide: getSlide,
|
||
|
||
// Returns the slide background element at the specified index
|
||
getSlideBackground: getSlideBackground,
|
||
|
||
// Returns the speaker notes string for a slide, or null
|
||
getSlideNotes: getSlideNotes,
|
||
|
||
// Returns the previous slide element, may be null
|
||
getPreviousSlide: function() {
|
||
return previousSlide;
|
||
},
|
||
|
||
// Returns the current slide element
|
||
getCurrentSlide: function() {
|
||
return currentSlide;
|
||
},
|
||
|
||
// Returns the current scale of the presentation content
|
||
getScale: function() {
|
||
return scale;
|
||
},
|
||
|
||
// Returns the current configuration object
|
||
getConfig: function() {
|
||
return config;
|
||
},
|
||
|
||
// Helper method, retrieves query string as a key/value hash
|
||
getQueryHash: function() {
|
||
var query = {};
|
||
|
||
location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, function(a) {
|
||
query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
|
||
} );
|
||
|
||
// Basic deserialization
|
||
for( var i in query ) {
|
||
var value = query[ i ];
|
||
|
||
query[ i ] = deserialize( unescape( value ) );
|
||
}
|
||
|
||
return query;
|
||
},
|
||
|
||
// Returns true if we're currently on the first slide
|
||
isFirstSlide: function() {
|
||
return ( indexh === 0 && indexv === 0 );
|
||
},
|
||
|
||
// Returns true if we're currently on the last slide
|
||
isLastSlide: function() {
|
||
if( currentSlide ) {
|
||
// Does this slide has next a sibling?
|
||
if( currentSlide.nextElementSibling ) return false;
|
||
|
||
// If it's vertical, does its parent have a next sibling?
|
||
if( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
},
|
||
|
||
// Checks if reveal.js has been loaded and is ready for use
|
||
isReady: function() {
|
||
return loaded;
|
||
},
|
||
|
||
// Forward event binding to the reveal DOM element
|
||
addEventListener: function( type, listener, useCapture ) {
|
||
if( 'addEventListener' in window ) {
|
||
( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
|
||
}
|
||
},
|
||
removeEventListener: function( type, listener, useCapture ) {
|
||
if( 'addEventListener' in window ) {
|
||
( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
|
||
}
|
||
},
|
||
|
||
// Programatically triggers a keyboard event
|
||
triggerKey: function( keyCode ) {
|
||
onDocumentKeyDown( { keyCode: keyCode } );
|
||
},
|
||
|
||
// Registers a new shortcut to include in the help overlay
|
||
registerKeyboardShortcut: function( key, value ) {
|
||
keyboardShortcuts[key] = value;
|
||
}
|
||
};
|
||
|
||
return Reveal;
|
||
|
||
}));
|