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2075 lines (1610 loc) · 55.7 KB
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/*!
* reveal.js
* http://lab.hakim.se/reveal-js
* MIT licensed
*
* Copyright (C) 2013 Hakim El Hattab, http://hakim.se
*/
var Reveal = (function(){
'use strict';
var SLIDES_SELECTOR = '.reveal .slides section',
HORIZONTAL_SLIDES_SELECTOR = '.reveal .slides>section',
VERTICAL_SLIDES_SELECTOR = '.reveal .slides>section.present>section',
HOME_SLIDE_SELECTOR = '.reveal .slides>section:first-child',
// Configurations 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: 1.0,
// Display controls in the bottom right corner
controls: true,
// Display a presentation progress bar
progress: true,
// Push each slide change to the browser history
history: false,
// Enable keyboard shortcuts for navigation
keyboard: true,
// Enable the slide overview mode
overview: true,
// Vertical centring 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,
// Number of milliseconds between automatically proceeding to the
// next slide, disabled when set to 0, this value can be overwritten
// by using a data-autoslide attribute on your slides
autoSlide: 0,
// Enable slide navigation via mouse wheel
mouseWheel: false,
// Apply a 3D roll to links on hover
rollingLinks: true,
// Theme (see /css/theme)
theme: null,
// Transition style
transition: 'default', // default/cube/page/concave/zoom/linear/fade/none
// Script dependencies to load
dependencies: []
},
// The current auto-slide duration
autoSlide = 0,
// The horizontal and vertical index of the currently active slide
indexh = 0,
indexv = 0,
// The previous and current slide HTML elements
previousSlide,
currentSlide,
// Slides may hold a data-state attribute which we pick up and apply
// as a class to the body. This list contains the combined state of
// all current slides.
state = [],
// The current scale of the presentation (see width/height config)
scale = 1,
// Cached references to DOM elements
dom = {},
// Detect support for CSS 3D transforms
supports3DTransforms = 'WebkitPerspective' in document.body.style ||
'MozPerspective' in document.body.style ||
'msPerspective' in document.body.style ||
'OPerspective' in document.body.style ||
'perspective' in document.body.style,
// Detect support for CSS 2D transforms
supports2DTransforms = 'WebkitTransform' in document.body.style ||
'MozTransform' in document.body.style ||
'msTransform' in document.body.style ||
'OTransform' in document.body.style ||
'transform' in document.body.style,
// Throttles mouse wheel navigation
mouseWheelTimeout = 0,
// An interval used to automatically move on to the next slide
autoSlideTimeout = 0,
// Delays updates to the URL due to a Chrome thumbnailer bug
writeURLTimeout = 0,
// A delay used to activate the overview mode
activateOverviewTimeout = 0,
// A delay used to deactivate the overview mode
deactivateOverviewTimeout = 0,
// Flags if the interaction event listeners are bound
eventsAreBound = false,
// Holds information about the currently ongoing touch input
touch = {
startX: 0,
startY: 0,
startSpan: 0,
startCount: 0,
handled: false,
threshold: 80
};
/**
* Starts up the presentation if the client is capable.
*/
function initialize( options ) {
if( !supports2DTransforms && !supports3DTransforms ) {
document.body.setAttribute( 'class', 'no-transforms' );
// If the browser doesn't support core features we won't be
// using JavaScript to control the presentation
return;
}
// Force a layout when the whole page, incl fonts, has loaded
window.addEventListener( 'load', layout, false );
// Copy options over to our config object
extend( config, options );
// Hide the address bar in mobile browsers
hideAddressBar();
// Loads the dependencies and continues to #start() once done
load();
}
/**
* Finds and stores references to DOM elements which are
* required by the presentation. If a required element is
* not found, it is created.
*/
function setupDOM() {
// Cache references to key DOM elements
dom.theme = document.querySelector( '#theme' );
dom.wrapper = document.querySelector( '.reveal' );
dom.slides = document.querySelector( '.reveal .slides' );
// Progress bar
if( !dom.wrapper.querySelector( '.progress' ) && config.progress ) {
var progressElement = document.createElement( 'div' );
progressElement.classList.add( 'progress' );
progressElement.innerHTML = '<span></span>';
dom.wrapper.appendChild( progressElement );
}
// Arrow controls
if( !dom.wrapper.querySelector( '.controls' ) && config.controls ) {
var controlsElement = document.createElement( 'aside' );
controlsElement.classList.add( 'controls' );
controlsElement.innerHTML = '<div class="navigate-left"></div>' +
'<div class="navigate-right"></div>' +
'<div class="navigate-up"></div>' +
'<div class="navigate-down"></div>';
dom.wrapper.appendChild( controlsElement );
}
// Presentation background element
if( !dom.wrapper.querySelector( '.state-background' ) ) {
var backgroundElement = document.createElement( 'div' );
backgroundElement.classList.add( 'state-background' );
dom.wrapper.appendChild( backgroundElement );
}
// Overlay graphic which is displayed during the paused mode
if( !dom.wrapper.querySelector( '.pause-overlay' ) ) {
var pausedElement = document.createElement( 'div' );
pausedElement.classList.add( 'pause-overlay' );
dom.wrapper.appendChild( pausedElement );
}
// Cache references to elements
dom.progress = document.querySelector( '.reveal .progress' );
dom.progressbar = document.querySelector( '.reveal .progress span' );
if ( config.controls ) {
dom.controls = document.querySelector( '.reveal .controls' );
// 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' ) );
}
}
/**
* Hides the address bar if we're on a mobile device.
*/
function hideAddressBar() {
if( /iphone|ipod|android/gi.test( navigator.userAgent ) && !/crios/gi.test( navigator.userAgent ) ) {
// Events that should trigger the address bar to hide
window.addEventListener( 'load', removeAddressBar, false );
window.addEventListener( 'orientationchange', removeAddressBar, false );
}
}
/**
* Loads the dependencies of reveal.js. Dependencies are
* defined via the configuration option 'dependencies'
* and will be loaded prior to starting/binding reveal.js.
* Some dependencies may have an 'async' flag, if so they
* will load after reveal.js has been started up.
*/
function load() {
var scripts = [],
scriptsAsync = [];
for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
var s = config.dependencies[i];
// Load if there's no condition or the condition is truthy
if( !s.condition || s.condition() ) {
if( s.async ) {
scriptsAsync.push( s.src );
}
else {
scripts.push( s.src );
}
// Extension may contain callback functions
if( typeof s.callback === 'function' ) {
head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], s.callback );
}
}
}
// Called once synchronous scripts finish loading
function proceed() {
if( scriptsAsync.length ) {
// Load asynchronous scripts
head.js.apply( null, scriptsAsync );
}
start();
}
if( scripts.length ) {
head.ready( proceed );
// Load synchronous scripts
head.js.apply( null, scripts );
}
else {
proceed();
}
}
/**
* Starts up reveal.js by binding input events and navigating
* to the current URL deeplink if there is one.
*/
function start() {
// Make sure we've got all the DOM elements we need
setupDOM();
// Subscribe to input
addEventListeners();
// Updates the presentation to match the current configuration values
configure();
// Read the initial hash
readURL();
// Notify listeners that the presentation is ready but use a 1ms
// timeout to ensure it's not fired synchronously after #initialize()
setTimeout( function() {
dispatchEvent( 'ready', {
'indexh': indexh,
'indexv': indexv,
'currentSlide': currentSlide
} );
}, 1 );
}
/**
* Applies the configuration settings from the config object.
*/
function configure( options ) {
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( supports3DTransforms === false ) config.transition = 'linear';
dom.wrapper.classList.add( config.transition );
if( dom.controls ) {
dom.controls.style.display = ( config.controls && dom.controls ) ? 'block' : 'none';
}
if( dom.progress ) {
dom.progress.style.display = ( config.progress && dom.progress ) ? 'block' : 'none';
}
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' );
}
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 );
}
// 3D links
if( config.rollingLinks ) {
enable3DLinks();
}
else {
disable3DLinks();
}
// Load the theme in the config, if it's not already loaded
if( config.theme && dom.theme ) {
var themeURL = dom.theme.getAttribute( 'href' );
var themeFinder = /[^\/]*?(?=\.css)/;
var themeName = themeURL.match(themeFinder)[0];
if( config.theme !== themeName ) {
themeURL = themeURL.replace(themeFinder, config.theme);
dom.theme.setAttribute( 'href', themeURL );
}
}
// 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();
}
/**
* 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.msPointerEnabled ) {
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 );
}
if ( config.progress && dom.progress ) {
dom.progress.addEventListener( 'click', onProgressClicked, false );
}
if ( config.controls && dom.controls ) {
[ 'touchstart', 'click' ].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 );
window.removeEventListener( 'hashchange', onWindowHashChange, false );
window.removeEventListener( 'resize', onWindowResize, false );
if( config.touch ) {
dom.wrapper.removeEventListener( 'touchstart', onTouchStart, false );
dom.wrapper.removeEventListener( 'touchmove', onTouchMove, false );
dom.wrapper.removeEventListener( 'touchend', onTouchEnd, false );
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 );
}
if ( config.controls && dom.controls ) {
[ '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 );
}
/**
* 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.s
10BC8
qrt( dx*dx + dy*dy );
}
/**
* Causes the address bar to hide on mobile devices,
* more vertical space ftw.
*/
function removeAddressBar() {
if( window.orientation === 0 ) {
document.documentElement.style.overflow = 'scroll';
document.body.style.height = '120%';
}
else {
document.documentElement.style.overflow = '';
document.body.style.height = '100%';
}
setTimeout( function() {
window.scrollTo( 0, 1 );
}, 10 );
}
/**
* Dispatches an event of the specified type from the
* reveal DOM element.
*/
function dispatchEvent( type, properties ) {
var event = document.createEvent( "HTMLEvents", 1, 2 );
event.initEvent( type, true, true );
extend( event, properties );
dom.wrapper.dispatchEvent( event );
}
/**
* Wrap all links in 3D goodness.
*/
function enable3DLinks() {
if( supports3DTransforms && !( 'msPerspective' in document.body.style ) ) {
var anchors = document.querySelectorAll( SLIDES_SELECTOR + ' a:not(.image)' );
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 disable3DLinks() {
var anchors = document.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;
}
}
}
/**
* 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 ) {
var a = toArray( fragments );
a.forEach( function( el, idx ) {
if( !el.hasAttribute( 'data-fragment-index' ) ) {
el.setAttribute( 'data-fragment-index', idx );
}
} );
a.sort( function( l, r ) {
return l.getAttribute( 'data-fragment-index' ) - r.getAttribute( 'data-fragment-index');
} );
return a;
}
/**
* Applies JavaScript-controlled layout rules to the
* presentation.
*/
function layout() {
if( dom.wrapper ) {
// Available space to scale within
var availableWidth = dom.wrapper.offsetWidth,
availableHeight = dom.wrapper.offsetHeight;
// Reduce available space by margin
availableWidth -= ( availableHeight * config.margin );
availableHeight -= ( availableHeight * config.margin );
// Dimensions of the content
var slideWidth = config.width,
slideHeight = config.height;
// Slide width may be a percentage of available width
if( typeof slideWidth === 'string' && /%$/.test( slideWidth ) ) {
slideWidth = parseInt( slideWidth, 10 ) / 100 * availableWidth;
}
// Slide height may be a percentage of available height
if( typeof slideHeight === 'string' && /%$/.test( slideHeight ) ) {
slideHeight = parseInt( slideHeight, 10 ) / 100 * availableHeight;
}
dom.slides.style.width = slideWidth + 'px';
dom.slides.style.height = slideHeight + 'px';
// Determine scale of content to fit within available space
scale = Math.min( availableWidth / slideWidth, availableHeight / slideHeight );
// Respect max/min scale settings
scale = Math.max( scale, config.minScale );
scale = Math.min( scale, config.maxScale );
// Prefer applying scale via zoom since Chrome blurs scaled content
// with nested transforms
if( typeof dom.slides.style.zoom !== 'undefined' && !navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi ) ) {
dom.slides.style.zoom = scale;
}
// Apply scale transform as a fallback
else {
var transform = 'translate(-50%, -50%) scale('+ scale +') translate(50%, 50%)';
dom.slides.style.WebkitTransform = transform;
dom.slides.style.MozTransform = transform;
dom.slides.style.msTransform = transform;
dom.slides.style.OTransform = transform;
dom.slides.style.transform = transform;
}
// Select all slides, vertical and horizontal
var slides = toArray( document.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 ) {
// 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( - ( slide.offsetHeight / 2 ) - 20, -slideHeight / 2 ) + 'px';
}
}
else {
slide.style.top = '';
}
}
}
}
/**
* 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' ) ) {
return parseInt( stack.getAttribute( 'data-previous-indexv' ) || 0, 10 );
}
return 0;
}
/**
* Displays the overview of slides (quick nav) by
* scaling down and arranging all slide elements.
*
* Experimental feature, might be dropped if perf
* can't be improved.
*/
function activateOverview() {
// Only proceed if enabled in config
if( config.overview ) {
// Don't auto-slide while in overview mode
cancelAutoSlide();
var wasActive = dom.wrapper.classList.contains( 'overview' );
dom.wrapper.classList.add( 'overview' );
dom.wrapper.classList.remove( 'exit-overview' );
clearTimeout( activateOverviewTimeout );
clearTimeout( deactivateOverviewTimeout );
// Not the pretties solution, but need to let the overview
// class apply first so that slides are measured accurately
// before we can position them
activateOverviewTimeout = setTimeout( function(){
var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
var hslide = horizontalSlides[i],
htransform = 'translateZ(-2500px) translate(' + ( ( i - indexh ) * 105 ) + '%, 0%)';
hslide.setAttribute( 'data-index-h', i );
hslide.style.display = 'block';
hslide.style.WebkitTransform = htransform;
hslide.style.MozTransform = htransform;
hslide.style.msTransform = htransform;
hslide.style.OTransform = htransform;
hslide.style.transform = htransform;
if( hslide.classList.contains( 'stack' ) ) {
var verticalSlides = hslide.querySelectorAll( 'section' );
for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );
var vslide = verticalSlides[j],
vtransform = 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)';
vslide.setAttribute( 'data-index-h', i );
vslide.setAttribute( 'data-index-v', j );
vslide.style.display = 'block';
vslide.style.WebkitTransform = vtransform;
vslide.style.MozTransform = vtransform;
vslide.style.msTransform = vtransform;
vslide.style.OTransform = vtransform;
vslide.style.transform = vtransform;
// Navigate to this slide on click
vslide.addEventListener( 'click', onOverviewSlideClicked, true );
}
}
else {
// Navigate to this slide on click
hslide.addEventListener( 'click', onOverviewSlideClicked, true );
}
}
layout();
if( !wasActive ) {
// Notify observers of the overview showing
dispatchEvent( 'overviewshown', {
'indexh': indexh,
'indexv': indexv,
'currentSlide': currentSlide
} );
}
}, 10 );
}
}
/**
* Exits the slide overview and enters the currently
* active slide.
*/
function deactivateOverview() {
// Only proceed if enabled in config
if( config.overview ) {
clearTimeout( activateOverviewTimeout );
clearTimeout( deactivateOverviewTimeout );
dom.wrapper.classList.remove( 'overview' );
// 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( 'exit-overview' );
deactivateOverviewTimeout = setTimeout( function () {
dom.wrapper.classList.remove( 'exit-overview' );
}, 10);
// Select all slides
var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
for( var i = 0, len = slides.length; i < len; i++ ) {
var element = slides[i];
element.style.display = '';
// Resets all transforms to use the external styles
element.style.WebkitTransform = '';
element.style.MozTransform = '';
element.style.msTransform = '';
element.style.OTransform = '';
element.style.transform = '';
element.removeEventListener( 'click', onOverviewSlideClicked, true );
}
slide( indexh, indexv );
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 dom.wrapper.classList.contains( 'overview' );
}
/**
* Handling the fullscreen functionality via the fullscreen API
*
* @see http://fullscreen.spec.whatwg.org/
* @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
*/
function enterFullscreen() {
var element = document.body;
// Check which implementation is available
var requestMethod = element.requestFullScreen ||
element.webkitRequestFullScreen ||
element.mozRequestFullScreen ||
element.msRequestFullScreen;
if( requestMethod ) {
requestMethod.apply( element );
}
}
/**
* Enters the paused mode which fades everything on screen to
* black.
*/
function pause() {
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' );
cueAutoSlide();
dom.wrapper.classList.remove( 'paused' );
if( wasPaused ) {
dispatchEvent( 'resumed' );
}
}
/**
* Toggles the paused mode on and off.
*/
function togglePause() {
if( isPaused() ) {
resume();
}
else {
pause();
}