/*!
* reveal.js
* http://revealjs.com
* MIT licensed
*
* Copyright (C) 2019 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 = '3.8.0';
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: 0.04,
// Bounds for smallest/largest possible scale to apply to content
minScale: 0.2,
maxScale: 2.0,
// Display presentation control arrows
controls: true,
// Help the user learn the controls by providing hints, for example by
// bouncing the down arrow when they first encounter a vertical slide
controlsTutorial: true,
// Determines where controls appear, "edges" or "bottom-right"
controlsLayout: 'bottom-right',
// Visibility rule for backwards navigation arrows; "faded", "hidden"
// or "visible"
controlsBackArrows: 'faded',
// Display a presentation progress bar
progress: true,
// Display the page number of the current slide
// - true: Show slide number
// - false: Hide slide number
//
// Can optionally be set as a string that specifies the number formatting:
// - "h.v": Horizontal . vertical slide number (default)
// - "h/v": Horizontal / vertical slide number
// - "c": Flattened slide number
// - "c/t": Flattened slide number / total slides
//
// Alternatively, you can provide a function that returns the slide
// number for the current slide. The function needs to return an array
// with one string [slideNumber] or three strings [n1,delimiter,n2].
// See #formatSlideNumber().
slideNumber: false,
// Can be used to limit the contexts in which the slide number appears
// - "all": Always show the slide number
// - "print": Only when printing to PDF
// - "speaker": Only in the speaker view
showSlideNumber: 'all',
// Use 1 based indexing for # links to match slide number (default is zero
// based)
hashOneBasedIndex: false,
// Add the current slide number to the URL hash so that reloading the
// page/copying the URL will return you to the same slide
hash: false,
// Push each slide change to the browser history. Implies `hash: true`
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,
// Disables the default reveal.js slide layout so that you can use
// custom CSS layout
disableLayout: false,
// 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,
// Changes the behavior of our navigation directions.
//
// "default"
// Left/right arrow keys step between horizontal slides, up/down
// arrow keys step between vertical slides. Space key steps through
// all slides (both horizontal and vertical).
//
// "linear"
// Removes the up/down arrows. Left/right arrows step through all
// slides (both horizontal and vertical).
//
// "grid"
// When this is enabled, stepping left/right from a vertical stack
// to an adjacent vertical stack will land you at the same vertical
// index.
//
// Consider a deck with six slides ordered in two vertical stacks:
// 1.1 2.1
// 1.2 2.2
// 1.3 2.3
//
// If you're on slide 1.3 and navigate right, you will normally move
// from 1.3 -> 2.1. If "grid" is used, the same navigation takes you
// from 1.3 -> 2.3.
navigationMode: 'default',
// Randomizes the order of slides each time the presentation loads
shuffle: false,
// Turns fragments on and off globally
fragments: true,
// Flags whether to include the current fragment in the URL,
// so that reloading brings you to the same fragment position
fragmentInURL: false,
// 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 question-mark
// 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,
// Global override for autolaying embedded media (video/audio/iframe)
// - null: Media will only autoplay if data-autoplay is present
// - true: All media will autoplay, regardless of individual setting
// - false: No media will autoplay, regardless of individual setting
autoPlayMedia: null,
// Global override for preloading lazy-loaded iframes
// - null: Iframes with data-src AND data-preload will be loaded when within
// the viewDistance, iframes with only data-src will be loaded when visible
// - true: All iframes with data-src will be loaded when within the viewDistance
// - false: All iframes with data-src will be loaded only when visible
preloadIframes: null,
// Controls automatic progression to the next slide
// - 0: Auto-sliding only happens if the data-autoslide HTML attribute
// is present on the current slide or fragment
// - 1+: All slides will progress automatically at the given interval
// - false: No auto-sliding, even if data-autoslide is present
autoSlide: 0,
// Stop auto-sliding after user input
autoSlideStoppable: true,
// Use this method for navigation when auto-sliding (defaults to navigateNext)
autoSlideMethod: null,
// Specify the average time in seconds that you think you will spend
// presenting each slide. This is used to show a pacing timer in the
// speaker view
defaultTiming: 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
// Add `data-preview-link` and `data-preview-link="false"` to customise each link
// individually
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 visibility 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"
// Parallax background repeat
parallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit
// Parallax background position
parallaxBackgroundPosition: '', // CSS syntax, e.g. "top left"
// Amount of pixels to move the parallax background per slide step
parallaxBackgroundHorizontal: null,
parallaxBackgroundVertical: null,
// The maximum number of pages a single slide can expand onto when printing
// to PDF, unlimited by default
pdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,
// Prints each fragment on a separate slide
pdfSeparateFragments: true,
// Offset used to reduce the height of content within exported PDF pages.
// This exists to account for environment differences based on how you
// print to PDF. CLI printing options, like phantomjs and wkpdf, can end
// on precisely the total height of the document whereas in-browser
// printing has to end one pixel before.
pdfPageHeightOffset: -1,
// Number of slides away from the current that are visible
viewDistance: 3,
// The display mode that will be used to show slides
display: 'block',
// Hide cursor if inactive
hideInactiveCursor: true,
// Time before the cursor is hidden (in ms)
hideCursorTime: 5000,
// Script dependencies to load
dependencies: []
},
// Flags if Reveal.initialize() has been called
initialized = false,
// 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,
// Remember which directions that the user has navigated towards
hasNavigatedRight = false,
hasNavigatedDown = false,
// 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 = {},
// A list of registered reveal.js plugins
plugins = {},
// List of asynchronously loaded reveal.js dependencies
asyncDependencies = [],
// 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,
// Is the mouse pointer currently hidden from view
cursorHidden = false,
// Timeout used to determine when the cursor is inactive
cursorInactiveTimeout = 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,
startCount: 0,
captured: false,
threshold: 40
},
// A key:value map of shortcut keyboard keys and descriptions of
// the actions they trigger, generated in #configure()
keyboardShortcuts = {},
// Holds custom key code mappings
registeredKeyBindings = {};
/**
* Starts up the presentation if the client is capable.
*/
function initialize(options) {
// Make sure we only initialize once
if (initialized === true) return;
initialized = true;
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 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 = [],
scriptsToLoad = 0;
config.dependencies.forEach(function (s) {
// Load if there's no condition or the condition is truthy
if (!s.condition || s.condition()) {
if (s.async) {
asyncDependencies.push(s);
}
else {
scripts.push(s);
}
}
});
if (scripts.length) {
scriptsToLoad = scripts.length;
// Load synchronous scripts
scripts.forEach(function (s) {
loadScript(s.src, function () {
if (typeof s.callback === 'function') s.callback();
if (--scriptsToLoad === 0) {
initPlugins();
}
});
});
}
else {
initPlugins();
}
}
/**
* Initializes our plugins and waits for them to be ready
* before proceeding.
*/
function initPlugins() {
var pluginsToInitialize = Object.keys(plugins).length;
// If there are no plugins, skip this step
if (pluginsToInitialize === 0) {
loadAsyncDependencies();
}
// ... otherwise initialize plugins
else {
var afterPlugInitialized = function () {
if (--pluginsToInitialize === 0) {
loadAsyncDependencies();
}
};
for (var i in plugins) {
var plugin = plugins[i];
// If the plugin has an 'init' method, invoke it
if (typeof plugin.init === 'function') {
var callback = plugin.init();
// If the plugin returned a Promise, wait for it
if (callback && typeof callback.then === 'function') {
callback.then(afterPlugInitialized);
}
else {
afterPlugInitialized();
}
}
else {
afterPlugInitialized();
}
}
}
}
/**
* Loads all async reveal.js dependencies.
*/
function loadAsyncDependencies() {
if (asyncDependencies.length) {
asyncDependencies.forEach(function (s) {
loadScript(s.src, s.callback);
});
}
start();
}
/**
* Loads a JavaScript file from the given URL and executes it.
*
* @param {string} url Address of the .js file to load
* @param {function} callback Method to invoke when the script
* has loaded and executed
*/
function loadScript(url, callback) {
var script = document.createElement('script');
script.type = 'text/javascript';
script.async = false;
script.defer = false;
script.src = url;
if (callback) {
// Success callback
script.onload = script.onreadystatechange = function (event) {
if (event.type === "load" || (/loaded|complete/.test(script.readyState))) {
// Kill event listeners
script.onload = script.onreadystatechange = script.onerror = null;
callback();
}
};
// Error callback
script.onerror = function (err) {
// Kill event listeners
script.onload = script.onreadystatechange = script.onerror = null;
callback(new Error('Failed loading script: ' + script.src + '\n' + err));
};
}
// Append the script at the end of <head>
var head = document.querySelector('head');
head.insertBefore(script, head.lastChild);
}
/**
* Starts up reveal.js by binding input events and navigating
* to the current URL deeplink if there is one.
*/
function start() {
loaded = true;
// 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');
dom.wrapper.classList.add('ready');
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');
if (isMobileDevice) {
dom.wrapper.classList.add('no-hover');
}
else {
dom.wrapper.classList.remove('no-hover');
}
if (/iphone/gi.test(UA)) {
dom.wrapper.classList.add('ua-iphone');
}
else {
dom.wrapper.classList.remove('ua-iphone');
}
// 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
dom.controls = createSingletonNode(dom.wrapper, 'aside', 'controls',
'<button class="navigate-left" aria-label="previous slide"><div class="controls-arrow"></div></button>' +
'<button class="navigate-right" aria-label="next slide"><div class="controls-arrow"></div></button>' +
'<button class="navigate-up" aria-label="above slide"><div class="controls-arrow"></div></button>' +
'<button class="navigate-down" aria-label="below slide"><div class="controls-arrow"></div></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', '');
dom.speakerNotes.setAttribute('tabindex', '0');
// Overlay graphic which is displayed during the paused mode
dom.pauseOverlay = createSingletonNode(dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class="resume-button">Resume presentation</button>' : null);
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'));
// The right and down arrows in the standard reveal.js controls
dom.controlsRightArrow = dom.controls.querySelector('.navigate-right');
dom.controlsDownArrow = dom.controls.querySelector('.navigate-down');
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.
*
* @return {HTMLElement}
*/
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;
}
/**
* Converts the given HTML element into a string of text
* that can be announced to a screen reader. Hidden
* elements are excluded.
*/
function getStatusText(node) {
var text = '';
// Text node
if (node.nodeType === 3) {
text += node.textContent;
}
// Element node
else if (node.nodeType === 1) {
var isAriaHidden = node.getAttribute('aria-hidden');
var isDisplayHidden = window.getComputedStyle(node)['display'] === 'none';
if (isAriaHidden !== 'true' && !isDisplayHidden) {
toArray(node.childNodes).forEach(function (child) {
text += getStatusText(child);
});
}
}
return text;
}
/**
* 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: 0px;}');
// 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';
// Make sure stretch elements fit on slide
layoutSlideContents(slideWidth, slideHeight);
// 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 = slide.scrollHeight;
var numberOfPages = Math.max(Math.ceil(contentHeight / pageHeight), 1);
// Adhere to configured pages per slide limit
numberOfPages = Math.min(numberOfPages, config.pdfMaxPagesPerSlide);
// Center slides vertically
if (numberOfPages === 1 && config.center || slide.classList.contains('center')) {
top = Math.max((pageHeight - contentHeight) / 2, 0);
}
// Wrap the slide in a page element and hide its overflow
// so that no page ever flows onto another
var page = document.createElement('div');
page.className = 'pdf-page';
page.style.height = ((pageHeight + config.pdfPageHeightOffset) * numberOfPages) + 'px';
slide.parentNode.insertBefore(page, slide);
page.appendChild(slide);
// Position the slide inside of the page
slide.style.left = left + 'px';
slide.style.top = top + 'px';
slide.style.width = slideWidth + 'px';
if (slide.slideBackgroundElement) {
page.insertBefore(slide.slideBackgroundElement, slide);
}
// Inject notes if `showNotes` is enabled
if (config.showNotes) {
// Are there notes for this slide?
var notes = getSlideNotes(slide);
if (notes) {
var notesSpacing = 8;
var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
var notesElement = document.createElement('div');
notesElement.classList.add('speaker-notes');
notesElement.classList.add('speaker-notes-pdf');
notesElement.setAttribute('data-layout', notesLayout);
notesElement.innerHTML = notes;
if (notesLayout === 'separate-page') {
page.parentNode.insertBefore(notesElement, page.nextSibling);
}
else {
notesElement.style.left = notesSpacing + 'px';
notesElement.style.bottom = notesSpacing + 'px';
notesElement.style.width = (pageWidth - notesSpacing * 2) + 'px';
page.appendChild(notesElement);
}
}
}
// Inject slide numbers if `slideNumbers` are enabled
if (config.slideNumber && /all|print/i.test(config.showSlideNumber)) {
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);
page.appendChild(numberElement);
}
// Copy page and show fragments one after another
if (config.pdfSeparateFragments) {
// Each fragment 'group' is an array containing one or more
// fragments. Multiple fragments that appear at the same time
// are part of the same group.
var fragmentGroups = sortFragments(page.querySelectorAll('.fragment'), true);
var previousFragmentStep;
var previousPage;
fragmentGroups.forEach(function (fragments) {
// Remove 'current-fragment' from the previous group
if (previousFragmentStep) {
previousFragmentStep.forEach(function (fragment) {
fragment.classList.remove('current-fragment');
});
}
// Show the fragments for the current index
fragments.forEach(function (fragment) {
fragment.classList.add('visible', 'current-fragment');
});
// Create a separate page for the current fragment state
var clonedPage = page.cloneNode(true);
page.parentNode.insertBefore(clonedPage, (previousPage || page).nextSibling);
previousFragmentStep = fragments;
previousPage = clonedPage;
});
// Reset the first/original page so that all fragments are hidden
fragmentGroups.forEach(function (fragments) {
fragments.forEach(function (fragment) {
fragment.classList.remove('visible', 'current-fragment');
});
});
}
// Show all fragments
else {
toArray(page.querySelectorAll('.fragment:not(.fade-out)')).forEach(function (fragment) {
fragment.classList.add('visible');
});
}
}
});
// Notify subscribers that the PDF layout is good to go
dispatchEvent('pdf-ready');
}
/**
* 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.
*
* @param {HTMLElement} container
* @param {string} tagname
* @param {string} classname
* @param {string} innerHTML
*
* @return {HTMLElement}
*/
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.className = 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 = createBackground(slideh, dom.background);
// Iterate over all vertical slides
toArray(slideh.querySelectorAll('section')).forEach(function (slidev) {
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;
dom.background.style.backgroundRepeat = config.parallaxBackgroundRepeat;
dom.background.style.backgroundPosition = config.parallaxBackgroundPosition;
// 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
* @return {HTMLElement} New background div
*/
function createBackground(slide, container) {
// Main slide background element
var element = document.createElement('div');
element.className = 'slide-background ' + slide.className.replace(/present|past|future/, '');
// Inner background element that wraps images/videos/iframes
var contentElement = document.createElement('div');
contentElement.className = 'slide-background-content';
element.appendChild(contentElement);
container.appendChild(element);
slide.slideBackgroundElement = element;
slide.slideBackgroundContentElement = contentElement;
// Syncs the background to reflect all current background settings
syncBackground(slide);
return element;
}
/**
* Renders all of the visual properties of a slide background
* based on the various background attributes.
*
* @param {HTMLElement} slide
*/
function syncBackground(slide) {
var element = slide.slideBackgroundElement,
contentElement = slide.slideBackgroundContentElement;
// Reset the prior background state in case this is not the
// initial sync
slide.classList.remove('has-dark-background');
slide.classList.remove('has-light-background');
element.removeAttribute('data-loaded');
element.removeAttribute('data-background-hash');
element.removeAttribute('data-background-size');
element.removeAttribute('data-background-transition');
element.style.backgroundColor = '';
contentElement.style.backgroundSize = '';
contentElement.style.backgroundRepeat = '';
contentElement.style.backgroundPosition = '';
contentElement.style.backgroundImage = '';
contentElement.style.opacity = '';
contentElement.innerHTML = '';
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'),
backgroundOpacity: slide.getAttribute('data-background-opacity')
};
if (data.background) {
// Auto-wrap image urls in url(...)
if (/^(http|file|\/\/)/gi.test(data.background) || /\.(svg|png|jpg|jpeg|gif|bmp)([?#\s]|$)/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 +
data.backgroundOpacity);
}
// Additional and optional background properties
if (data.backgroundSize) element.setAttribute('data-background-size', data.backgroundSize);
if (data.backgroundColor) element.style.backgroundColor = data.backgroundColor;
if (data.backgroundTransition) element.setAttribute('data-background-transition', data.backgroundTransition);
// Background image options are set on the content wrapper
if (data.backgroundSize) contentElement.style.backgroundSize = data.backgroundSize;
if (data.backgroundRepeat) contentElement.style.backgroundRepeat = data.backgroundRepeat;
if (data.backgroundPosition) contentElement.style.backgroundPosition = data.backgroundPosition;
if (data.backgroundOpacity) contentElement.style.opacity = data.backgroundOpacity;
// If this slide has a background color, we add a class that
// signals if it is light or dark. If the slide has no background
// color, no class will be added
var contrastColor = data.backgroundColor;
// If no bg color was found, check the computed background
if (!contrastColor) {
var computedBackgroundStyle = window.getComputedStyle(element);
if (computedBackgroundStyle && computedBackgroundStyle.backgroundColor) {
contrastColor = computedBackgroundStyle.backgroundColor;
}
}
if (contrastColor) {
var rgb = colorToRgb(contrastColor);
// 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(contrastColor) < 128) {
slide.classList.add('has-dark-background');
}
else {
slide.classList.add('has-light-background');
}
}
}
}
/**
* 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.
*
* @param {object} options
*/
function configure(options) {
var oldTransition = 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);
// Abort if reveal.js hasn't finished loading, config
// changes will be applied automatically once loading
// finishes
if (loaded === false) return;
var numberOfSlides = dom.wrapper.querySelectorAll(SLIDES_SELECTOR).length;
// Remove the previously configured transition class
dom.wrapper.classList.remove(oldTransition);
// 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.controls.setAttribute('data-controls-layout', config.controlsLayout);
dom.controls.setAttribute('data-controls-back-arrows', config.controlsBackArrows);
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.setAttribute('data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline');
}
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();
}
// Auto-hide the mouse pointer when its inactive
if (config.hideInactiveCursor) {
document.addEventListener('mousemove', onDocumentCursorActive, false);
document.addEventListener('mousedown', onDocumentCursorActive, false);
}
else {
showCursor();
document.removeEventListener('mousemove', onDocumentCursorActive, false);
document.removeEventListener('mousedown', onDocumentCursorActive, false);
}
// Iframe link previews
if (config.previewLinks) {
enablePreviewLinks();
disablePreviewLinks('[data-preview-link=false]');
}
else {
disablePreviewLinks();
enablePreviewLinks('[data-preview-link]:not([data-preview-link=false])');
}
// 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');
});
}
// Slide numbers
var slideNumberDisplay = 'none';
if (config.slideNumber && !isPrintingPDF()) {
if (config.showSlideNumber === 'all') {
slideNumberDisplay = 'block';
}
else if (config.showSlideNumber === 'speaker' && isSpeakerNotes()) {
slideNumberDisplay = 'block';
}
}
dom.slideNumber.style.display = slideNumberDisplay;
// Add the navigation mode to the DOM so we can adjust styling
if (config.navigationMode !== 'default') {
dom.wrapper.setAttribute('data-navigation-mode', config.navigationMode);
}
else {
dom.wrapper.removeAttribute('data-navigation-mode');
}
// Define our contextual list of keyboard shortcuts
if (config.navigationMode === 'linear') {
keyboardShortcuts['→ , ↓ , SPACE , N , L , J'] = 'Next slide';
keyboardShortcuts['← , ↑ , P , H , K'] = 'Previous slide';
}
else {
keyboardShortcuts['N , SPACE'] = 'Next slide';
keyboardShortcuts['P'] = 'Previous slide';
keyboardShortcuts['← , H'] = 'Navigate left';
keyboardShortcuts['→ , L'] = 'Navigate right';
keyboardShortcuts['↑ , K'] = 'Navigate up';
keyboardShortcuts['↓ , J'] = 'Navigate down';
}
keyboardShortcuts['Home , ⌘/CTRL ←'] = 'First slide';
keyboardShortcuts['End , ⌘/CTRL →'] = 'Last slide';
keyboardShortcuts['B , .'] = 'Pause';
keyboardShortcuts['F'] = 'Fullscreen';
keyboardShortcuts['ESC, O'] = 'Slide overview';
sync();
}
/**
* Binds all event listeners.
*/
function addEventListeners() {
eventsAreBound = true;
window.addEventListener('hashchange', onWindowHashChange, false);
window.addEventListener('resize', onWindowResize, false);
if (config.touch) {
if ('onpointerdown' in window) {
// Use W3C 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);
}
else {
// Fall back to touch events
dom.wrapper.addEventListener('touchstart', onTouchStart, false);
dom.wrapper.addEventListener('touchmove', onTouchMove, false);
dom.wrapper.addEventListener('touchend', onTouchEnd, 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);
}
dom.pauseOverlay.addEventListener('click', resume, 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('pointerdown', onPointerDown, false);
dom.wrapper.removeEventListener('pointermove', onPointerMove, false);
dom.wrapper.removeEventListener('pointerup', onPointerUp, false);
dom.wrapper.removeEventListener('MSPointerDown', onPointerDown, false);
dom.wrapper.removeEventListener('MSPointerMove', onPointerMove, false);
dom.wrapper.removeEventListener('MSPointerUp', onPointerUp, false);
dom.wrapper.removeEventListener('touchstart', onTouchStart, false);
dom.wrapper.removeEventListener('touchmove', onTouchMove, false);
dom.wrapper.removeEventListener('touchend', onTouchEnd, false);
dom.pauseOverlay.removeEventListener('click', resume, 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); });
});
}
/**
* Registers a new plugin with this reveal.js instance.
*
* reveal.js waits for all regisered plugins to initialize
* before considering itself ready, as long as the plugin
* is registered before calling `Reveal.initialize()`.
*/
function registerPlugin(id, plugin) {
if (plugins[id] === undefined) {
plugins[id] = plugin;
// If a plugin is registered after reveal.js is loaded,
// initialize it right away
if (loaded && typeof plugin.init === 'function') {
plugin.init();
}
}
else {
console.warn('reveal.js: "' + id + '" plugin has already been registered');
}
}
/**
* Checks if a specific plugin has been registered.
*
* @param {String} id Unique plugin identifier
*/
function hasPlugin(id) {
return !!plugins[id];
}
/**
* Returns the specific plugin instance, if a plugin
* with the given ID has been registered.
*
* @param {String} id Unique plugin identifier
*/
function getPlugin(id) {
return plugins[id];
}
/**
* Add a custom key binding with optional description to
* be added to the help screen.
*/
function addKeyBinding(binding, callback) {
if (typeof binding === 'object' && binding.keyCode) {
registeredKeyBindings[binding.keyCode] = {
callback: callback,
key: binding.key,
description: binding.description
};
}
else {
registeredKeyBindings[binding] = {
callback: callback,
key: null,
description: null
};
}
}
/**
* Removes the specified custom key binding.
*/
function removeKeyBinding(keyCode) {
delete registeredKeyBindings[keyCode];
}
/**
* Extend object a with the properties of object b.
* If there's a conflict, object b takes precedence.
*
* @param {object} a
* @param {object} b
*/
function extend(a, b) {
for (var i in b) {
a[i] = b[i];
}
return a;
}
/**
* Converts the target object to an array.
*
* @param {object} o
* @return {object[]}
*/
function toArray(o) {
return Array.prototype.slice.call(o);
}
/**
* Utility for deserializing a value.
*
* @param {*} value
* @return {*}
*/
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
*
* @return {number}
*/
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.
*
* @param {HTMLElement} element
* @param {string} transform
*/
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.
*
* @param {object} transforms
*/
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.
*
* @param {string} value
*/
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);
}
/**
* Find the closest parent that matches the given
* selector.
*
* @param {HTMLElement} target The child element
* @param {String} selector The CSS selector to match
* the parents against
*
* @return {HTMLElement} The matched parent or null
* if no matching parent was found
*/
function closestParent(target, selector) {
var parent = target.parentNode;
while (parent) {
// There's some overhead doing this each time, we don't
// want to rewrite the element prototype but should still
// be enough to feature detect once at startup...
var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector;
// If we find a match, we're all set
if (matchesMethod && matchesMethod.call(parent, selector)) {
return parent;
}
// Keep searching
parent = parent.parentNode;
}
return null;
}
/**
* Converts various color input formats to an {r:0,g:0,b:0} object.
*
* @param {string} color The string representation of a color
* @example
* colorToRgb('#000');
* @example
* colorToRgb('#000000');
* @example
* colorToRgb('rgb(0,0,0)');
* @example
* colorToRgb('rgba(0,0,0)');
*
* @return {{r: number, g: number, b: number, [a]: number}|null}
*/
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 {string} color See colorToRgb for supported formats.
* @see {@link colorToRgb}
*/
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;
}
/**
* Returns the remaining height within the parent of the
* target element.
*
* remaining height = [ configured parent height ] - [ current parent height ]
*
* @param {HTMLElement} element
* @param {number} [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';
// In Overview mode, the parent (.slide) height is set of 700px.
// Restore it temporarily to its natural height.
element.parentNode.style.height = 'auto';
newHeight = height - element.parentNode.offsetHeight;
// Restore the old height, just in case
element.style.height = oldHeight + 'px';
// Clear the parent (.slide) height. .removeProperty works in IE9+
element.parentNode.style.removeProperty('height');
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.
*
* @param {string} [selector=a] - selector for anchors
*/
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(selector) {
var anchors = toArray(document.querySelectorAll(selector ? selector : '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.
*
* @param {string} url - url for preview iframe src
*/
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>',
'<small class="viewport-inner">',
'<span class="x-frame-error">Unable to load iframe. This is likely due to the site\'s policy (x-frame-options).</span>',
'</small>',
'</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);
}
/**
* Open or close help overlay window.
*
* @param {Boolean} [override] Flag which overrides the
* toggle logic and forcibly sets the desired state. True means
* help is open, false means it's closed.
*/
function toggleHelp(override) {
if (typeof override === 'boolean') {
override ? showHelp() : closeOverlay();
}
else {
if (dom.overlay) {
closeOverlay();
}
else {
showHelp();
}
}
}
/**
* Opens an 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>';
}
// Add custom key bindings that have associated descriptions
for (var binding in registeredKeyBindings) {
if (registeredKeyBindings[binding].key && registeredKeyBindings[binding].description) {
html += '<tr><td>' + registeredKeyBindings[binding].key + '</td><td>' + registeredKeyBindings[binding].description + '</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()) {
if (!config.disableLayout) {
// On some mobile devices '100vh' is taller than the visible
// viewport which leads to part of the presentation being
// cut off. To work around this we define our own '--vh' custom
// property where 100x adds up to the correct height.
//
// https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
if (isMobileDevice) {
document.documentElement.style.setProperty('--vh', (window.innerHeight * 0.01) + 'px');
}
var size = getComputedSlideSize();
var oldScale = scale;
// Layout the contents of the slides
layoutSlideContents(config.width, config.height);
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 - slide.scrollHeight) / 2, 0) + 'px';
}
}
else {
slide.style.top = '';
}
}
if (oldScale !== scale) {
dispatchEvent('resize', {
'oldScale': oldScale,
'scale': scale,
'size': size
});
}
}
updateProgress();
updateParallax();
if (isOverview()) {
updateOverview();
}
}
}
/**
* Applies layout logic to the contents of all slides in
* the presentation.
*
* @param {string|number} width
* @param {string|number} height
*/
function layoutSlideContents(width, height) {
// 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.
*
* @param {number} [presentationWidth=dom.wrapper.offsetWidth]
* @param {number} [presentationHeight=dom.wrapper.offsetHeight]
*/
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 {string|number} [v=0] 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() {
var vmin = Math.min(window.innerWidth, window.innerHeight);
var scale = Math.max(vmin / 5, 150) / vmin;
transformSlides({
overview: [
'scale(' + scale + ')',
'translateX(' + (-indexh * overviewSlideWidth) + 'px)',
'translateY(' + (-indexv * overviewSlideHeight) + '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] 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;
}
/**
* Return a hash URL that will resolve to the current slide location.
*/
function locationHash() {
var url = '/';
// Attempt to create a named link based on the slide's ID
var id = currentSlide ? currentSlide.getAttribute('id') : null;
if (id) {
id = encodeURIComponent(id);
}
var indexf;
if (config.fragmentInURL) {
indexf = getIndices().f;
}
// If the current slide has an ID, use that as a named link,
// but we don't support named links with a fragment index
if (typeof id === 'string' && id.length && indexf === undefined) {
url = '/' + id;
}
// Otherwise use the /h/v index
else {
var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
if (indexh > 0 || indexv > 0 || indexf !== undefined) url += indexh + hashIndexBase;
if (indexv > 0 || indexf !== undefined) url += '/' + (indexv + hashIndexBase);
if (indexf !== undefined) url += '/' + indexf;
}
return url;
}
/**
* Checks if the current or specified slide is vertical
* (nested within another slide).
*
* @param {HTMLElement} [slide=currentSlide] The slide to check
* orientation of
* @return {Boolean}
*/
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);
}
}
/**
* Shows the mouse pointer after it has been hidden with
* #hideCursor.
*/
function showCursor() {
if (cursorHidden) {
cursorHidden = false;
dom.wrapper.style.cursor = '';
}
}
/**
* Hides the mouse pointer when it's on top of the .reveal
* container.
*/
function hideCursor() {
if (cursorHidden === false) {
cursorHidden = true;
dom.wrapper.style.cursor = 'none';
}
}
/**
* 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.
*
* @return {Boolean}
*/
function isPaused() {
return dom.wrapper.classList.contains('paused');
}
/**
* Toggles the auto slide mode on and off.
*
* @param {Boolean} [override] 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.
*
* @return {Boolean}
*/
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 {number} [h=indexh] Horizontal index of the target slide
* @param {number} [v=indexv] Vertical index of the target slide
* @param {number} [f] Index of a fragment within the
* target slide to activate
* @param {number} [o] 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);
// Abort if there are no slides
if (horizontalSlides.length === 0) return;
// 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();
// 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) {
// 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 !== currentSlide) {
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);
}
}
// 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());
}
if (slideChanged) {
dispatchEvent('slidechanged', {
'indexh': indexh,
'indexv': indexv,
'previousSlide': previousSlide,
'currentSlide': currentSlide,
'origin': o
});
}
// Handle embedded content
if (slideChanged || !previousSlide) {
stopEmbeddedContent(previousSlide);
startEmbeddedContent(currentSlide);
}
// Announce the current slide contents, for screen readers
dom.statusDiv.textContent = getStatusText(currentSlide);
updateControls();
updateProgress();
updateBackground();
updateParallax();
updateSlideNumber();
updateNotes();
updateFragments();
// 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();
updateSlideNumber();
updateSlidesVisibility();
updateBackground(true);
updateNotesVisibility();
updateNotes();
formatEmbeddedContent();
// Start or stop embedded content depending on global config
if (config.autoPlayMedia === false) {
stopEmbeddedContent(currentSlide, { unloadIframes: false });
}
else {
startEmbeddedContent(currentSlide);
}
if (isOverview()) {
layoutOverview();
}
}
/**
* Updates reveal.js to keep in sync with new slide attributes. For
* example, if you add a new `data-background-image` you can call
* this to have reveal.js render the new background image.
*
* Similar to #sync() but more efficient when you only need to
* refresh a specific slide.
*
* @param {HTMLElement} slide
*/
function syncSlide(slide) {
// Default to the current slide
slide = slide || currentSlide;
syncBackground(slide);
syncFragments(slide);
updateBackground();
updateNotes();
loadSlide(slide);
}
/**
* Formats the fragments on the given slide so that they have
* valid indices. Call this if fragments are changed in the DOM
* after reveal.js has already initialized.
*
* @param {HTMLElement} slide
* @return {Array} a list of the HTML fragments that were synced
*/
function syncFragments(slide) {
// Default to the current slide
slide = slide || currentSlide;
return sortFragments(slide.querySelectorAll('.fragment'));
}
/**
* 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) {
// Show all fragments in prior slides
toArray(element.querySelectorAll('.fragment')).forEach(function (fragment) {
fragment.classList.add('visible');
fragment.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) {
// Hide all fragments in future slides
toArray(element.querySelectorAll('.fragment.visible')).forEach(function (fragment) {
fragment.classList.remove('visible');
fragment.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) {
loadSlide(horizontalSlide);
}
else {
unloadSlide(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) {
loadSlide(verticalSlide);
}
else {
unloadSlide(verticalSlide);
}
}
}
}
// Flag if there are ANY vertical slides, anywhere in the deck
if (dom.wrapper.querySelectorAll('.slides>section>section').length) {
dom.wrapper.classList.add('has-vertical-slides');
}
else {
dom.wrapper.classList.remove('has-vertical-slides');
}
// Flag if there are ANY horizontal slides, anywhere in the deck
if (dom.wrapper.querySelectorAll('.slides>section').length > 1) {
dom.wrapper.classList.add('has-horizontal-slides');
}
else {
dom.wrapper.classList.remove('has-horizontal-slides');
}
}
}
/**
* Pick up notes from the current slide and display them
* to the viewer.
*
* @see {@link config.showNotes}
*/
function updateNotes() {
if (config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF()) {
dom.speakerNotes.innerHTML = getSlideNotes() || '<span class="notes-placeholder">No notes on this slide.</span>';
}
}
/**
* Updates the visibility of the speaker notes sidebar that
* is used to share annotated slides. The notes sidebar is
* only visible if showNotes is true and there are notes on
* one or more slides in the deck.
*/
function updateNotesVisibility() {
if (config.showNotes && hasNotes()) {
dom.wrapper.classList.add('show-notes');
}
else {
dom.wrapper.classList.remove('show-notes');
}
}
/**
* Checks if there are speaker notes for ANY slide in the
* presentation.
*/
function hasNotes() {
return dom.slides.querySelectorAll('[data-notes], aside.notes').length > 0;
}
/**
* 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 to match the current slide.
*/
function updateSlideNumber() {
// Update slide number if enabled
if (config.slideNumber && dom.slideNumber) {
var value;
var format = 'h.v';
if (typeof config.slideNumber === 'function') {
value = config.slideNumber();
}
else {
// Check if a custom number format is available
if (typeof config.slideNumber === 'string') {
format = config.slideNumber;
}
// If there are ONLY vertical slides in this deck, always use
// a flattened slide number
if (!/c/.test(format) && dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR).length === 1) {
format = 'c';
}
value = [];
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.
*
* @param {number} a Current slide
* @param {string} delimiter Character to separate slide numbers
* @param {(number|*)} b Total slides
* @return {string} HTML string fragment
*/
function formatSlideNumber(a, delimiter, b) {
var url = '#' + locationHash();
if (typeof b === 'number' && !isNaN(b)) {
return '<a href="' + url + '">' +
'<span class="slide-number-a">' + a + '</span>' +
'<span class="slide-number-delimiter">' + delimiter + '</span>' +
'<span class="slide-number-b">' + b + '</span>' +
'</a>';
}
else {
return '<a href="' + url + '">' +
'<span class="slide-number-a">' + a + '</span>' +
'</a>';
}
}
/**
* 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');
// Set 'disabled' attribute on all directions
node.setAttribute('disabled', 'disabled');
});
// Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons
if (routes.left) dom.controlsLeft.forEach(function (el) { el.classList.add('enabled'); el.removeAttribute('disabled'); });
if (routes.right) dom.controlsRight.forEach(function (el) { el.classList.add('enabled'); el.removeAttribute('disabled'); });
if (routes.up) dom.controlsUp.forEach(function (el) { el.classList.add('enabled'); el.removeAttribute('disabled'); });
if (routes.down) dom.controlsDown.forEach(function (el) { el.classList.add('enabled'); el.removeAttribute('disabled'); });
// Prev/next buttons
if (routes.left || routes.up) dom.controlsPrev.forEach(function (el) { el.classList.add('enabled'); el.removeAttribute('disabled'); });
if (routes.right || routes.down) dom.controlsNext.forEach(function (el) { el.classList.add('enabled'); el.removeAttribute('disabled'); });
// 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'); el.removeAttribute('disabled'); });
if (fragments.next) dom.controlsNext.forEach(function (el) { el.classList.add('fragmented', 'enabled'); el.removeAttribute('disabled'); });
// 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'); el.removeAttribute('disabled'); });
if (fragments.next) dom.controlsDown.forEach(function (el) { el.classList.add('fragmented', 'enabled'); el.removeAttribute('disabled'); });
}
else {
if (fragments.prev) dom.controlsLeft.forEach(function (el) { el.classList.add('fragmented', 'enabled'); el.removeAttribute('disabled'); });
if (fragments.next) dom.controlsRight.forEach(function (el) { el.classList.add('fragmented', 'enabled'); el.removeAttribute('disabled'); });
}
}
if (config.controlsTutorial) {
// Highlight control arrows with an animation to ensure
// that the viewer knows how to navigate
if (!hasNavigatedDown && routes.down) {
dom.controlsDownArrow.classList.add('highlight');
}
else {
dom.controlsDownArrow.classList.remove('highlight');
if (!hasNavigatedRight && routes.right && indexv === 0) {
dom.controlsRightArrow.classList.add('highlight');
}
else {
dom.controlsRightArrow.classList.remove('highlight');
}
}
}
}
/**
* 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 content inside of previous backgrounds
if (previousBackground) {
stopEmbeddedContent(previousBackground);
}
// Start content in the current background
if (currentBackground) {
startEmbeddedContent(currentBackground);
var currentBackgroundContent = currentBackground.querySelector('.slide-background-content');
if (currentBackgroundContent) {
var backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';
// Restart GIFs (doesn't work in Firefox)
if (/\.gif/i.test(backgroundImageURL)) {
currentBackgroundContent.style.backgroundImage = '';
window.getComputedStyle(currentBackgroundContent).opacity;
currentBackgroundContent.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 : 0;
dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
}
}
/**
* Should the given element be preloaded?
* Decides based on local element attributes and global config.
*
* @param {HTMLElement} element
*/
function shouldPreload(element) {
// Prefer an explicit global preload setting
var preload = config.preloadIframes;
// If no global setting is available, fall back on the element's
// own preload setting
if (typeof preload !== 'boolean') {
preload = element.hasAttribute('data-preload');
}
return preload;
}
/**
* 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).
*
* @param {HTMLElement} slide Slide to show
*/
function loadSlide(slide, options) {
options = options || {};
// Show the slide element
slide.style.display = config.display;
// Media elements with data-src attributes
toArray(slide.querySelectorAll('img[data-src], video[data-src], audio[data-src], iframe[data-src]')).forEach(function (element) {
if (element.tagName !== 'IFRAME' || shouldPreload(element)) {
element.setAttribute('src', element.getAttribute('data-src'));
element.setAttribute('data-lazy-loaded', '');
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');
source.setAttribute('data-lazy-loaded', '');
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 background = slide.slideBackgroundElement;
if (background) {
background.style.display = 'block';
var backgroundContent = slide.slideBackgroundContentElement;
// 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) {
backgroundContent.style.backgroundImage = 'url(' + encodeURI(backgroundImage) + ')';
}
// Videos
else if (backgroundVideo && !isSpeakerNotes()) {
var video = document.createElement('video');
if (backgroundVideoLoop) {
video.setAttribute('loop', '');
}
if (backgroundVideoMuted) {
video.muted = true;
}
// Inline video playback works (at least in Mobile Safari) as
// long as the video is muted and the `playsinline` attribute is
// present
if (isMobileDevice) {
video.muted = true;
video.autoplay = true;
video.setAttribute('playsinline', '');
}
// Support comma separated lists of video sources
backgroundVideo.split(',').forEach(function (source) {
video.innerHTML += '<source src="' + source + '">';
});
backgroundContent.appendChild(video);
}
// Iframes
else if (backgroundIframe && options.excludeIframes !== true) {
var iframe = document.createElement('iframe');
iframe.setAttribute('allowfullscreen', '');
iframe.setAttribute('mozallowfullscreen', '');
iframe.setAttribute('webkitallowfullscreen', '');
// Only load autoplaying content when the slide is shown to
// avoid having it play in the background
if (/autoplay=(1|true|yes)/gi.test(backgroundIframe)) {
iframe.setAttribute('data-src', backgroundIframe);
}
else {
iframe.setAttribute('src', backgroundIframe);
}
iframe.style.width = '100%';
iframe.style.height = '100%';
iframe.style.maxHeight = '100%';
iframe.style.maxWidth = '100%';
backgroundContent.appendChild(iframe);
}
}
}
}
/**
* Unloads and hides the given slide. This is called when the
* slide is moved outside of the configured view distance.
*
* @param {HTMLElement} slide
*/
function unloadSlide(slide) {
// Hide the slide element
slide.style.display = 'none';
// Hide the corresponding background element
var background = getSlideBackground(slide);
if (background) {
background.style.display = 'none';
}
// Reset lazy-loaded media elements with src attributes
toArray(slide.querySelectorAll('video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]')).forEach(function (element) {
element.setAttribute('data-src', element.getAttribute('src'));
element.removeAttribute('src');
});
// Reset lazy-loaded media elements with <source> children
toArray(slide.querySelectorAll('video[data-lazy-loaded] source[src], audio source[src]')).forEach(function (source) {
source.setAttribute('data-src', source.getAttribute('src'));
source.removeAttribute('src');
});
}
/**
* Determine what available routes there are for navigation.
*
* @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
*/
function availableRoutes() {
var horizontalSlides = dom.wrapper.querySelectorAll(HORIZONTAL_SLIDES_SELECTOR),
verticalSlides = dom.wrapper.querySelectorAll(VERTICAL_SLIDES_SELECTOR);
var routes = {
left: indexh > 0,
right: indexh < horizontalSlides.length - 1,
up: indexv > 0,
down: indexv < verticalSlides.length - 1
};
// Looped presentations can always be navigated as long as
// there are slides available
if (config.loop) {
if (horizontalSlides.length > 1) {
routes.left = true;
routes.right = true;
}
if (verticalSlides.length > 1) {
routes.up = true;
routes.down = true;
}
}
// 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 {{prev: boolean, next: boolean}}
*/
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 given element.
*
* @param {HTMLElement} element
*/
function startEmbeddedContent(element) {
if (element && !isSpeakerNotes()) {
// Restart GIFs
toArray(element.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(element.querySelectorAll('video, audio')).forEach(function (el) {
if (closestParent(el, '.fragment') && !closestParent(el, '.fragment.visible')) {
return;
}
// Prefer an explicit global autoplay setting
var autoplay = config.autoPlayMedia;
// If no global setting is available, fall back on the element's
// own autoplay setting
if (typeof autoplay !== 'boolean') {
autoplay = el.hasAttribute('data-autoplay') || !!closestParent(el, '.slide-background');
}
if (autoplay && typeof el.play === 'function') {
// If the media is ready, start playback
if (el.readyState > 1) {
startEmbeddedMedia({ target: el });
}
// Mobile devices never fire a loaded event so instead
// of waiting, we initiate playback
else if (isMobileDevice) {
var promise = el.play();
// If autoplay does not work, ensure that the controls are visible so
// that the viewer can start the media on their own
if (promise && typeof promise.catch === 'function' && el.controls === false) {
promise.catch(function () {
el.controls = true;
// Once the video does start playing, hide the controls again
el.addEventListener('play', function () {
el.controls = false;
});
});
}
}
// If the media isn't loaded, wait before playing
else {
el.removeEventListener('loadeddata', startEmbeddedMedia); // remove first to avoid dupes
el.addEventListener('loadeddata', startEmbeddedMedia);
}
}
});
// Normal iframes
toArray(element.querySelectorAll('iframe[src]')).forEach(function (el) {
if (closestParent(el, '.fragment') && !closestParent(el, '.fragment.visible')) {
return;
}
startEmbeddedIframe({ target: el });
});
// Lazy loading iframes
toArray(element.querySelectorAll('iframe[data-src]')).forEach(function (el) {
if (closestParent(el, '.fragment') && !closestParent(el, '.fragment.visible')) {
return;
}
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 playing an embedded video/audio element after
* it has finished loading.
*
* @param {object} event
*/
function startEmbeddedMedia(event) {
var isAttachedToDOM = !!closestParent(event.target, 'html'),
isVisible = !!closestParent(event.target, '.present');
if (isAttachedToDOM && isVisible) {
event.target.currentTime = 0;
event.target.play();
}
event.target.removeEventListener('loadeddata', startEmbeddedMedia);
}
/**
* "Starts" the content of an embedded iframe using the
* postMessage API.
*
* @param {object} event
*/
function startEmbeddedIframe(event) {
var iframe = event.target;
if (iframe && iframe.contentWindow) {
var isAttachedToDOM = !!closestParent(event.target, 'html'),
isVisible = !!closestParent(event.target, '.present');
if (isAttachedToDOM && isVisible) {
// Prefer an explicit global autoplay setting
var autoplay = config.autoPlayMedia;
// If no global setting is available, fall back on the element's
// own autoplay setting
if (typeof autoplay !== 'boolean') {
autoplay = iframe.hasAttribute('data-autoplay') || !!closestParent(iframe, '.slide-background');
}
// YouTube postMessage API
if (/youtube\.com\/embed\//.test(iframe.getAttribute('src')) && autoplay) {
iframe.contentWindow.postMessage('{"event":"command","func":"playVideo","args":""}', '*');
}
// Vimeo postMessage API
else if (/player\.vimeo\.com\//.test(iframe.getAttribute('src')) && 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.
*
* @param {HTMLElement} element
*/
function stopEmbeddedContent(element, options) {
options = extend({
// Defaults
unloadIframes: true
}, options || {});
if (element && element.parentNode) {
// HTML5 media elements
toArray(element.querySelectorAll('video, audio')).forEach(function (el) {
if (!el.hasAttribute('data-ignore') && typeof el.pause === 'function') {
el.setAttribute('data-paused-by-reveal', '');
el.pause();
}
});
// Generic postMessage API for non-lazy loaded iframes
toArray(element.querySelectorAll('iframe')).forEach(function (el) {
if (el.contentWindow) el.contentWindow.postMessage('slide:stop', '*');
el.removeEventListener('load', startEmbeddedIframe);
});
// YouTube postMessage API
toArray(element.querySelectorAll('iframe[src*="youtube.com/embed/"]')).forEach(function (el) {
if (!el.hasAttribute('data-ignore') && el.contentWindow && typeof el.contentWindow.postMessage === 'function') {
el.contentWindow.postMessage('{"event":"command","func":"pauseVideo","args":""}', '*');
}
});
// Vimeo postMessage API
toArray(element.querySelectorAll('iframe[src*="player.vimeo.com/"]')).forEach(function (el) {
if (!el.hasAttribute('data-ignore') && el.contentWindow && typeof el.contentWindow.postMessage === 'function') {
el.contentWindow.postMessage('{"method":"pause"}', '*');
}
});
if (options.unloadIframes === true) {
// Unload lazy-loaded iframes
toArray(element.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.
*
* @return {number} Past slide count
*/
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.
*
* @return {number}
*/
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 Math.min(pastCount / (totalCount - 1), 1);
}
/**
* Checks if this presentation is running inside of the
* speaker notes window.
*
* @return {boolean}
*/
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 not fully numeric and there is a name we
// can assume that this is a named link
if (!/^[0-9]*$/.test(bits[0]) && name.length) {
var element;
// Ensure the named link is a valid HTML ID attribute
try {
element = document.getElementById(decodeURIComponent(name));
}
catch (error) { }
// Ensure that we're not already on a slide with the same name
var isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute('id') === name : false;
if (element) {
// If the slide exists and is not the current slide...
if (!isSameNameAsCurrentSlide) {
// ...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 {
var hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
// Read the index components of the hash
var h = (parseInt(bits[0], 10) - hashIndexBase) || 0,
v = (parseInt(bits[1], 10) - hashIndexBase) || 0,
f;
if (config.fragmentInURL) {
f = parseInt(bits[2], 10);
if (isNaN(f)) {
f = undefined;
}
}
if (h !== indexh || v !== indexv || f !== undefined) {
slide(h, v, f);
}
}
}
/**
* 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) {
// 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) {
// If we're configured to push to history OR the history
// API is not avaialble.
if (config.history || !window.history) {
window.location.hash = locationHash();
}
// If we're configured to reflect the current slide in the
// URL without pushing to history.
else if (config.hash) {
window.history.replaceState(null, null, '#' + locationHash());
}
// If history and hash are both disabled, a hash may still
// be added to the URL by clicking on a href with a hash
// target. Counter this by always removing the hash.
else {
window.history.replaceState(null, null, window.location.pathname + window.location.search);
}
}
}
/**
* Retrieves the h/v location and fragment 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 {{h: number, v: number, f: number}}
*/
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 all slides in this presentation.
*/
function getSlides() {
return toArray(dom.wrapper.querySelectorAll(SLIDES_SELECTOR + ':not(.stack)'));
}
/**
* Returns an array of objects where each object represents the
* attributes on its respective slide.
*/
function getSlidesAttributes() {
return getSlides().map(function (slide) {
var attributes = {};
for (var i = 0; i < slide.attributes.length; i++) {
var attribute = slide.attributes[i];
attributes[attribute.name] = attribute.value;
}
return attributes;
});
}
/**
* Retrieves the total number of slides in this presentation.
*
* @return {number}
*/
function getTotalSlides() {
return getSlides().length;
}
/**
* Returns the slide element matching the specified index.
*
* @return {HTMLElement}
*/
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.
*
* @param {mixed} x Horizontal background index OR a slide
* HTML element
* @param {number} y Vertical background index
* @return {(HTMLElement[]|*)}
*/
function getSlideBackground(x, y) {
var slide = typeof x === 'number' ? getSlide(x, y) : x;
if (slide) {
return slide.slideBackgroundElement;
}
return undefined;
}
/**
* 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
*
* @param {HTMLElement} [slide=currentSlide]
* @return {(string|null)}
*/
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.
*
* @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}
*/
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()
* @see {@link getState} generates the parameter `state`
*/
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.
*
* @param {object[]|*} fragments
* @param {boolean} grouped If true the returned array will contain
* nested arrays for all fragments with the same index
* @return {object[]} sorted Sorted array of fragments
*/
function sortFragments(fragments, grouped) {
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 grouped === true ? ordered : sorted;
}
/**
* Refreshes the fragments on the current slide so that they
* have the appropriate classes (.visible + .current-fragment).
*
* @param {number} [index] The index of the current fragment
* @param {array} [fragments] Array containing all fragments
* in the current slide
*
* @return {{shown: array, hidden: array}}
*/
function updateFragments(index, fragments) {
var changedFragments = {
shown: [],
hidden: []
};
if (currentSlide && config.fragments) {
fragments = fragments || sortFragments(currentSlide.querySelectorAll('.fragment'));
if (fragments.length) {
if (typeof index !== 'number') {
var currentFragment = sortFragments(currentSlide.querySelectorAll('.fragment.visible')).pop();
if (currentFragment) {
index = parseInt(currentFragment.getAttribute('data-fragment-index') || 0, 10);
}
}
toArray(fragments).forEach(function (el, i) {
if (el.hasAttribute('data-fragment-index')) {
i = parseInt(el.getAttribute('data-fragment-index'), 10);
}
// Visible fragments
if (i <= index) {
if (!el.classList.contains('visible')) changedFragments.shown.push(el);
el.classList.add('visible');
el.classList.remove('current-fragment');
// Announce the fragments one by one to the Screen Reader
dom.statusDiv.textContent = getStatusText(el);
if (i === index) {
el.classList.add('current-fragment');
startEmbeddedContent(el);
}
}
// Hidden fragments
else {
if (el.classList.contains('visible')) changedFragments.hidden.push(el);
el.classList.remove('visible');
el.classList.remove('current-fragment');
}
});
}
}
return changedFragments;
}
/**
* 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 changedFragments = updateFragments(index, fragments);
if (changedFragments.hidden.length) {
dispatchEvent('fragmenthidden', { fragment: changedFragments.hidden[0], fragments: changedFragments.hidden });
}
if (changedFragments.shown.length) {
dispatchEvent('fragmentshown', { fragment: changedFragments.shown[0], fragments: changedFragments.shown });
}
updateControls();
updateProgress();
if (config.fragmentInURL) {
writeURL();
}
return !!(changedFragments.shown.length || changedFragments.hidden.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 && config.autoSlide !== false) {
var fragment = currentSlide.querySelector('.current-fragment');
// When the slide first appears there is no "current" fragment so
// we look for a data-autoslide timing on the first fragment
if (!fragment) fragment = currentSlide.querySelector('.fragment');
var fragmentAutoSlide = fragment ? fragment.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.
// playbackRate is accounted for in the duration.
if (currentSlide.querySelectorAll('.fragment').length === 0) {
toArray(currentSlide.querySelectorAll('video, audio')).forEach(function (el) {
if (el.hasAttribute('data-autoplay')) {
if (autoSlide && (el.duration * 1000 / el.playbackRate) > autoSlide) {
autoSlide = (el.duration * 1000 / el.playbackRate) + 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, config.navigationMode === 'grid' ? indexv : undefined);
}
}
// Normal navigation
else if ((isOverview() || previousFragment() === false) && availableRoutes().left) {
slide(indexh - 1, config.navigationMode === 'grid' ? indexv : undefined);
}
}
function navigateRight() {
hasNavigatedRight = true;
// Reverse for RTL
if (config.rtl) {
if ((isOverview() || previousFragment() === false) && availableRoutes().right) {
slide(indexh - 1, config.navigationMode === 'grid' ? indexv : undefined);
}
}
// Normal navigation
else if ((isOverview() || nextFragment() === false) && availableRoutes().right) {
slide(indexh + 1, config.navigationMode === 'grid' ? indexv : undefined);
}
}
function navigateUp() {
// Prioritize hiding fragments
if ((isOverview() || previousFragment() === false) && availableRoutes().up) {
slide(indexh, indexv - 1);
}
}
function navigateDown() {
hasNavigatedDown = true;
// 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() {
hasNavigatedRight = true;
hasNavigatedDown = true;
// Prioritize revealing fragments
if (nextFragment() === false) {
var routes = availableRoutes();
// When looping is enabled `routes.down` is always available
// so we need a separate check for when we've reached the
// end of a stack and should move horizontally
if (routes.down && routes.right && config.loop && Reveal.isLastVerticalSlide(currentSlide)) {
routes.down = false;
}
if (routes.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.
*
* @param {object} [event]
*/
function onUserInput(event) {
if (config.autoSlideStoppable) {
pauseAutoSlide();
}
}
/**
* Called whenever there is mouse input at the document level
* to determine if the cursor is active or not.
*
* @param {object} event
*/
function onDocumentCursorActive(event) {
showCursor();
clearTimeout(cursorInactiveTimeout);
cursorInactiveTimeout = setTimeout(hideCursor, config.hideCursorTime);
}
/**
* Handler for the document level 'keypress' event.
*
* @param {object} event
*/
function onDocumentKeyPress(event) {
// Check if the pressed key is question mark
if (event.shiftKey && event.charCode === 63) {
toggleHelp();
}
}
/**
* Handler for the document level 'keydown' event.
*
* @param {object} event
*/
function onDocumentKeyDown(event) {
// If there's a condition specified and it returns false,
// ignore this event
if (typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false) {
return true;
}
// Shorthand
var keyCode = event.keyCode;
// Remember if auto-sliding was paused so we can toggle it
var autoSlideWasPaused = autoSlidePaused;
onUserInput(event);
// Is there 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);
var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test(document.activeElement.className);
// Whitelist specific modified + keycode combinations
var prevSlideShortcut = event.shiftKey && event.keyCode === 32;
var firstSlideShortcut = (event.metaKey || event.ctrlKey) && keyCode === 37;
var lastSlideShortcut = (event.metaKey || event.ctrlKey) && keyCode === 39;
// Prevent all other events when a modifier is pressed
var unusedModifier = !prevSlideShortcut && !firstSlideShortcut && !lastSlideShortcut &&
(event.shiftKey || event.altKey || event.ctrlKey || event.metaKey);
// Disregard the event if there's a focused element or a
// keyboard modifier key is present
if (activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier) return;
// While paused only allow resume keyboard events; 'b', 'v', '.'
var resumeKeyCodes = [66, 86, 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(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) === 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. Registered custom key bindings
if (triggered === false) {
for (key in registeredKeyBindings) {
// Check if this binding matches the pressed key
if (parseInt(key, 10) === keyCode) {
var action = registeredKeyBindings[key].callback;
// Callback function
if (typeof action === 'function') {
action.apply(null, [event]);
}
// String shortcuts to reveal.js API
else if (typeof action === 'string' && typeof Reveal[action] === 'function') {
Reveal[action].call();
}
triggered = true;
}
}
}
// 3. System defined key bindings
if (triggered === false) {
// Assume true and try to prove false
triggered = true;
// P, PAGE UP
if (keyCode === 80 || keyCode === 33) {
navigatePrev();
}
// N, PAGE DOWN
else if (keyCode === 78 || keyCode === 34) {
navigateNext();
}
// H, LEFT
else if (keyCode === 72 || keyCode === 37) {
if (firstSlideShortcut) {
slide(0);
}
else if (!isOverview() && config.navigationMode === 'linear') {
navigatePrev();
}
else {
navigateLeft();
}
}
// L, RIGHT
else if (keyCode === 76 || keyCode === 39) {
if (lastSlideShortcut) {
slide(Number.MAX_VALUE);
}
else if (!isOverview() && config.navigationMode === 'linear') {
navigateNext();
}
else {
navigateRight();
}
}
// K, UP
else if (keyCode === 75 || keyCode === 38) {
if (!isOverview() && config.navigationMode === 'linear') {
navigatePrev();
}
else {
navigateUp();
}
}
// J, DOWN
else if (keyCode === 74 || keyCode === 40) {
if (!isOverview() && config.navigationMode === 'linear') {
navigateNext();
}
else {
navigateDown();
}
}
// HOME
else if (keyCode === 36) {
slide(0);
}
// END
else if (keyCode === 35) {
slide(Number.MAX_VALUE);
}
// SPACE
else if (keyCode === 32) {
if (isOverview()) {
deactivateOverview();
}
if (event.shiftKey) {
navigatePrev();
}
else {
navigateNext();
}
}
// TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS "BLACK SCREEN" BUTTON
else if (keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191) {
togglePause();
}
// F
else if (keyCode === 70) {
enterFullscreen();
}
// A
else if (keyCode === 65) {
if (config.autoSlideStoppable) {
toggleAutoSlide(autoSlideWasPaused);
}
}
else {
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 ((keyCode === 27 || 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.
*
* @param {object} event
*/
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;
}
/**
* Handler for the 'touchmove' event.
*
* @param {object} 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;
// There was only one touch point, look for a swipe
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.
*
* @param {object} event
*/
function onTouchEnd(event) {
touch.captured = false;
}
/**
* Convert pointer down to touch start.
*
* @param {object} event
*/
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.
*
* @param {object} event
*/
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.
*
* @param {object} event
*/
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.
*
* @param {object} event
*/
function onDocumentMouseScroll(event) {
if (Date.now() - lastMouseWheelStep > 600) {
lastMouseWheelStep = Date.now();
var delta = event.detail || -event.wheelDelta;
if (delta > 0) {
navigateNext();
}
else if (delta < 0) {
navigatePrev();
}
}
}
/**
* Clicking on the progress bar results in a navigation to the
* closest approximate horizontal slide using this equation:
*
* ( clickX / presentationWidth ) * numberOfSlides
*
* @param {object} event
*/
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(); config.navigationMode === 'linear' ? navigatePrev() : navigateLeft(); }
function onNavigateRightClicked(event) { event.preventDefault(); onUserInput(); config.navigationMode === 'linear' ? navigateNext() : 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.
*
* @param {object} [event]
*/
function onWindowHashChange(event) {
readURL();
}
/**
* Handler for the window level 'resize' event.
*
* @param {object} [event]
*/
function onWindowResize(event) {
layout();
}
/**
* Handle for the window level 'visibilitychange' event.
*
* @param {object} [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.
*
* @param {object} event
*/
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.
*
* @param {object} event
*/
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.
*
* @param {object} [event]
*/
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();
}
/**
* @param value
*/
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 = 'rgba( 255, 255, 255, 0.2 )';
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,
syncSlide: syncSlide,
syncFragments: syncFragments,
// 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 a help overlay with keyboard shortcuts
toggleHelp: toggleHelp,
// 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,
isSpeakerNotes: isSpeakerNotes,
// Slide preloading
loadSlide: loadSlide,
unloadSlide: unloadSlide,
// 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
getSlidePastCount: getSlidePastCount,
// Presentation progress on range of 0-1
getProgress: getProgress,
// Returns the indices of the current, or specified, slide
getIndices: getIndices,
// Returns an Array of all slides
getSlides: getSlides,
// Returns an Array of objects representing the attributes on
// the slides
getSlidesAttributes: getSlidesAttributes,
// Returns the total number of slides
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 the top-level DOM element
getRevealElement: function () {
return dom.wrapper || document.querySelector('.reveal');
},
// Returns a hash with all registered plugins
getPlugins: function () {
return plugins;
},
// 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 have a next 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;
},
// Returns true if we're on the last slide in the current
// vertical stack
isLastVerticalSlide: function () {
if (currentSlide && isVerticalSlide(currentSlide)) {
// Does this slide have a next sibling?
if (currentSlide.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) {
Reveal.getRevealElement().addEventListener(type, listener, useCapture);
}
},
removeEventListener: function (type, listener, useCapture) {
if ('addEventListener' in window) {
Reveal.getRevealElement().removeEventListener(type, listener, useCapture);
}
},
// Adds/removes a custom key binding
addKeyBinding: addKeyBinding,
removeKeyBinding: removeKeyBinding,
// API for registering and retrieving plugins
registerPlugin: registerPlugin,
hasPlugin: hasPlugin,
getPlugin: getPlugin,
// Programmatically 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;
}));