Update to reveal.js 4.1.2 (#136)
- New tools/ script to manually keep step for updates
- Plugins are all updated
- Template update following latest Pandoc version
- updated README for documentation
- Help page updated
- See other change in NEWS file
diff --git a/inst/reveal.js-4.1.2/js/components/playback.js b/inst/reveal.js-4.1.2/js/components/playback.js
new file mode 100644
index 0000000..06fa7ba
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/components/playback.js
@@ -0,0 +1,165 @@
+/**
+ * UI component that lets the use control auto-slide
+ * playback via play/pause.
+ */
+export default class Playback {
+
+ /**
+ * @param {HTMLElement} container The component will append
+ * itself to this
+ * @param {function} progressCheck A method which will be
+ * called frequently to get the current playback progress on
+ * a range of 0-1
+ */
+ constructor( 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();
+
+ }
+
+ setPlaying( value ) {
+
+ const wasPlaying = this.playing;
+
+ this.playing = value;
+
+ // Start repainting if we weren't already
+ if( !wasPlaying && this.playing ) {
+ this.animate();
+ }
+ else {
+ this.render();
+ }
+
+ }
+
+ animate() {
+
+ const 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 ) {
+ requestAnimationFrame( this.animate.bind( this ) );
+ }
+
+ }
+
+ /**
+ * Renders the current progress and playback state.
+ */
+ render() {
+
+ let 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;
+
+ const endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );
+ const 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();
+
+ }
+
+ on( type, listener ) {
+ this.canvas.addEventListener( type, listener, false );
+ }
+
+ off( type, listener ) {
+ this.canvas.removeEventListener( type, listener, false );
+ }
+
+ destroy() {
+
+ this.playing = false;
+
+ if( this.canvas.parentNode ) {
+ this.container.removeChild( this.canvas );
+ }
+
+ }
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/config.js b/inst/reveal.js-4.1.2/js/config.js
new file mode 100644
index 0000000..77da305
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/config.js
@@ -0,0 +1,293 @@
+/**
+ * The default reveal.js config object.
+ */
+export default {
+
+ // 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 should take in a slide
+ // object and 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,
+
+ // Flags if we should monitor the hash and change slides accordingly
+ respondToHashChanges: true,
+
+ // 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
+ //
+ // If you set this to 'focused', we will only capture keyboard events
+ // for embedded decks when they are in focus
+ keyboardCondition: null,
+
+ // Disables the default reveal.js slide layout (scaling and centering)
+ // so that you can use custom CSS layout
+ disableLayout: false,
+
+ // Enable the slide overview mode
+ overview: true,
+
+ // Vertical centering of slides
+ center: true,
+
+ // Enables touch navigation on devices with touch input
+ touch: true,
+
+ // Loop the presentation
+ loop: false,
+
+ // Change the presentation direction to be RTL
+ rtl: false,
+
+ // 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: true,
+
+ // Flags if the presentation is running in an embedded mode,
+ // i.e. contained within a limited portion of the screen
+ embedded: false,
+
+ // Flags if we should show a help overlay when the 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,
+
+ // Flags if slides with data-visibility="hidden" should be kep visible
+ showHiddenSlides: false,
+
+ // Global override for autoplaying 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,
+
+ // Can be used to globally disable auto-animation
+ autoAnimate: true,
+
+ // Optionally provide a custom element matcher that will be
+ // used to dictate which elements we can animate between.
+ autoAnimateMatcher: null,
+
+ // Default settings for our auto-animate transitions, can be
+ // overridden per-slide or per-element via data arguments
+ autoAnimateEasing: 'ease',
+ autoAnimateDuration: 1.0,
+ autoAnimateUnmatched: true,
+
+ // CSS properties that can be auto-animated. Position & scale
+ // is matched separately so there's no need to include styles
+ // like top/right/bottom/left, width/height or margin.
+ autoAnimateStyles: [
+ 'opacity',
+ 'color',
+ 'background-color',
+ 'padding',
+ 'font-size',
+ 'line-height',
+ 'letter-spacing',
+ 'border-width',
+ 'border-color',
+ 'border-radius',
+ 'outline',
+ 'outline-offset'
+ ],
+
+ // 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,
+
+ // 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,
+
+ // Number of slides away from the current that are visible on mobile
+ // devices. It is advisable to set this to a lower number than
+ // viewDistance in order to save resources.
+ mobileViewDistance: 2,
+
+ // 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: [],
+
+ // Plugin objects to register and use for this presentation
+ plugins: []
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/controllers/autoanimate.js b/inst/reveal.js-4.1.2/js/controllers/autoanimate.js
new file mode 100644
index 0000000..60c02e5
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/autoanimate.js
@@ -0,0 +1,626 @@
+import { queryAll, extend, createStyleSheet, matches, closest } from '../utils/util.js'
+import { FRAGMENT_STYLE_REGEX } from '../utils/constants.js'
+
+// Counter used to generate unique IDs for auto-animated elements
+let autoAnimateCounter = 0;
+
+/**
+ * Automatically animates matching elements across
+ * slides with the [data-auto-animate] attribute.
+ */
+export default class AutoAnimate {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ }
+
+ /**
+ * Runs an auto-animation between the given slides.
+ *
+ * @param {HTMLElement} fromSlide
+ * @param {HTMLElement} toSlide
+ */
+ run( fromSlide, toSlide ) {
+
+ // Clean up after prior animations
+ this.reset();
+
+ let allSlides = this.Reveal.getSlides();
+ let toSlideIndex = allSlides.indexOf( toSlide );
+ let fromSlideIndex = allSlides.indexOf( fromSlide );
+
+ // Ensure that both slides are auto-animate targets with the same data-auto-animate-id value
+ // (including null if absent on both) and that data-auto-animate-restart isn't set on the
+ // physically latter slide (independent of slide direction)
+ if( fromSlide.hasAttribute( 'data-auto-animate' ) && toSlide.hasAttribute( 'data-auto-animate' )
+ && fromSlide.getAttribute( 'data-auto-animate-id' ) === toSlide.getAttribute( 'data-auto-animate-id' )
+ && !( toSlideIndex > fromSlideIndex ? toSlide : fromSlide ).hasAttribute( 'data-auto-animate-restart' ) ) {
+
+ // Create a new auto-animate sheet
+ this.autoAnimateStyleSheet = this.autoAnimateStyleSheet || createStyleSheet();
+
+ let animationOptions = this.getAutoAnimateOptions( toSlide );
+
+ // Set our starting state
+ fromSlide.dataset.autoAnimate = 'pending';
+ toSlide.dataset.autoAnimate = 'pending';
+
+ // Flag the navigation direction, needed for fragment buildup
+ animationOptions.slideDirection = toSlideIndex > fromSlideIndex ? 'forward' : 'backward';
+
+ // Inject our auto-animate styles for this transition
+ let css = this.getAutoAnimatableElements( fromSlide, toSlide ).map( elements => {
+ return this.autoAnimateElements( elements.from, elements.to, elements.options || {}, animationOptions, autoAnimateCounter++ );
+ } );
+
+ // Animate unmatched elements, if enabled
+ if( toSlide.dataset.autoAnimateUnmatched !== 'false' && this.Reveal.getConfig().autoAnimateUnmatched === true ) {
+
+ // Our default timings for unmatched elements
+ let defaultUnmatchedDuration = animationOptions.duration * 0.8,
+ defaultUnmatchedDelay = animationOptions.duration * 0.2;
+
+ this.getUnmatchedAutoAnimateElements( toSlide ).forEach( unmatchedElement => {
+
+ let unmatchedOptions = this.getAutoAnimateOptions( unmatchedElement, animationOptions );
+ let id = 'unmatched';
+
+ // If there is a duration or delay set specifically for this
+ // element our unmatched elements should adhere to those
+ if( unmatchedOptions.duration !== animationOptions.duration || unmatchedOptions.delay !== animationOptions.delay ) {
+ id = 'unmatched-' + autoAnimateCounter++;
+ css.push( `[data-auto-animate="running"] [data-auto-animate-target="${id}"] { transition: opacity ${unmatchedOptions.duration}s ease ${unmatchedOptions.delay}s; }` );
+ }
+
+ unmatchedElement.dataset.autoAnimateTarget = id;
+
+ }, this );
+
+ // Our default transition for unmatched elements
+ css.push( `[data-auto-animate="running"] [data-auto-animate-target="unmatched"] { transition: opacity ${defaultUnmatchedDuration}s ease ${defaultUnmatchedDelay}s; }` );
+
+ }
+
+ // Setting the whole chunk of CSS at once is the most
+ // efficient way to do this. Using sheet.insertRule
+ // is multiple factors slower.
+ this.autoAnimateStyleSheet.innerHTML = css.join( '' );
+
+ // Start the animation next cycle
+ requestAnimationFrame( () => {
+ if( this.autoAnimateStyleSheet ) {
+ // This forces our newly injected styles to be applied in Firefox
+ getComputedStyle( this.autoAnimateStyleSheet ).fontWeight;
+
+ toSlide.dataset.autoAnimate = 'running';
+ }
+ } );
+
+ this.Reveal.dispatchEvent({
+ type: 'autoanimate',
+ data: {
+ fromSlide,
+ toSlide,
+ sheet: this.autoAnimateStyleSheet
+ }
+ });
+
+ }
+
+ }
+
+ /**
+ * Rolls back all changes that we've made to the DOM so
+ * that as part of animating.
+ */
+ reset() {
+
+ // Reset slides
+ queryAll( this.Reveal.getRevealElement(), '[data-auto-animate]:not([data-auto-animate=""])' ).forEach( element => {
+ element.dataset.autoAnimate = '';
+ } );
+
+ // Reset elements
+ queryAll( this.Reveal.getRevealElement(), '[data-auto-animate-target]' ).forEach( element => {
+ delete element.dataset.autoAnimateTarget;
+ } );
+
+ // Remove the animation sheet
+ if( this.autoAnimateStyleSheet && this.autoAnimateStyleSheet.parentNode ) {
+ this.autoAnimateStyleSheet.parentNode.removeChild( this.autoAnimateStyleSheet );
+ this.autoAnimateStyleSheet = null;
+ }
+
+ }
+
+ /**
+ * Creates a FLIP animation where the `to` element starts out
+ * in the `from` element position and animates to its original
+ * state.
+ *
+ * @param {HTMLElement} from
+ * @param {HTMLElement} to
+ * @param {Object} elementOptions Options for this element pair
+ * @param {Object} animationOptions Options set at the slide level
+ * @param {String} id Unique ID that we can use to identify this
+ * auto-animate element in the DOM
+ */
+ autoAnimateElements( from, to, elementOptions, animationOptions, id ) {
+
+ // 'from' elements are given a data-auto-animate-target with no value,
+ // 'to' elements are are given a data-auto-animate-target with an ID
+ from.dataset.autoAnimateTarget = '';
+ to.dataset.autoAnimateTarget = id;
+
+ // Each element may override any of the auto-animate options
+ // like transition easing, duration and delay via data-attributes
+ let options = this.getAutoAnimateOptions( to, animationOptions );
+
+ // If we're using a custom element matcher the element options
+ // may contain additional transition overrides
+ if( typeof elementOptions.delay !== 'undefined' ) options.delay = elementOptions.delay;
+ if( typeof elementOptions.duration !== 'undefined' ) options.duration = elementOptions.duration;
+ if( typeof elementOptions.easing !== 'undefined' ) options.easing = elementOptions.easing;
+
+ let fromProps = this.getAutoAnimatableProperties( 'from', from, elementOptions ),
+ toProps = this.getAutoAnimatableProperties( 'to', to, elementOptions );
+
+ // Maintain fragment visibility for matching elements when
+ // we're navigating forwards, this way the viewer won't need
+ // to step through the same fragments twice
+ if( to.classList.contains( 'fragment' ) ) {
+
+ // Don't auto-animate the opacity of fragments to avoid
+ // conflicts with fragment animations
+ delete toProps.styles['opacity'];
+
+ if( from.classList.contains( 'fragment' ) ) {
+
+ let fromFragmentStyle = ( from.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];
+ let toFragmentStyle = ( to.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];
+
+ // Only skip the fragment if the fragment animation style
+ // remains unchanged
+ if( fromFragmentStyle === toFragmentStyle && animationOptions.slideDirection === 'forward' ) {
+ to.classList.add( 'visible', 'disabled' );
+ }
+
+ }
+
+ }
+
+ // If translation and/or scaling are enabled, css transform
+ // the 'to' element so that it matches the position and size
+ // of the 'from' element
+ if( elementOptions.translate !== false || elementOptions.scale !== false ) {
+
+ let presentationScale = this.Reveal.getScale();
+
+ let delta = {
+ x: ( fromProps.x - toProps.x ) / presentationScale,
+ y: ( fromProps.y - toProps.y ) / presentationScale,
+ scaleX: fromProps.width / toProps.width,
+ scaleY: fromProps.height / toProps.height
+ };
+
+ // Limit decimal points to avoid 0.0001px blur and stutter
+ delta.x = Math.round( delta.x * 1000 ) / 1000;
+ delta.y = Math.round( delta.y * 1000 ) / 1000;
+ delta.scaleX = Math.round( delta.scaleX * 1000 ) / 1000;
+ delta.scaleX = Math.round( delta.scaleX * 1000 ) / 1000;
+
+ let translate = elementOptions.translate !== false && ( delta.x !== 0 || delta.y !== 0 ),
+ scale = elementOptions.scale !== false && ( delta.scaleX !== 0 || delta.scaleY !== 0 );
+
+ // No need to transform if nothing's changed
+ if( translate || scale ) {
+
+ let transform = [];
+
+ if( translate ) transform.push( `translate(${delta.x}px, ${delta.y}px)` );
+ if( scale ) transform.push( `scale(${delta.scaleX}, ${delta.scaleY})` );
+
+ fromProps.styles['transform'] = transform.join( ' ' );
+ fromProps.styles['transform-origin'] = 'top left';
+
+ toProps.styles['transform'] = 'none';
+
+ }
+
+ }
+
+ // Delete all unchanged 'to' styles
+ for( let propertyName in toProps.styles ) {
+ const toValue = toProps.styles[propertyName];
+ const fromValue = fromProps.styles[propertyName];
+
+ if( toValue === fromValue ) {
+ delete toProps.styles[propertyName];
+ }
+ else {
+ // If these property values were set via a custom matcher providing
+ // an explicit 'from' and/or 'to' value, we always inject those values.
+ if( toValue.explicitValue === true ) {
+ toProps.styles[propertyName] = toValue.value;
+ }
+
+ if( fromValue.explicitValue === true ) {
+ fromProps.styles[propertyName] = fromValue.value;
+ }
+ }
+ }
+
+ let css = '';
+
+ let toStyleProperties = Object.keys( toProps.styles );
+
+ // Only create animate this element IF at least one style
+ // property has changed
+ if( toStyleProperties.length > 0 ) {
+
+ // Instantly move to the 'from' state
+ fromProps.styles['transition'] = 'none';
+
+ // Animate towards the 'to' state
+ toProps.styles['transition'] = `all ${options.duration}s ${options.easing} ${options.delay}s`;
+ toProps.styles['transition-property'] = toStyleProperties.join( ', ' );
+ toProps.styles['will-change'] = toStyleProperties.join( ', ' );
+
+ // Build up our custom CSS. We need to override inline styles
+ // so we need to make our styles vErY IMPORTANT!1!!
+ let fromCSS = Object.keys( fromProps.styles ).map( propertyName => {
+ return propertyName + ': ' + fromProps.styles[propertyName] + ' !important;';
+ } ).join( '' );
+
+ let toCSS = Object.keys( toProps.styles ).map( propertyName => {
+ return propertyName + ': ' + toProps.styles[propertyName] + ' !important;';
+ } ).join( '' );
+
+ css = '[data-auto-animate-target="'+ id +'"] {'+ fromCSS +'}' +
+ '[data-auto-animate="running"] [data-auto-animate-target="'+ id +'"] {'+ toCSS +'}';
+
+ }
+
+ return css;
+
+ }
+
+ /**
+ * Returns the auto-animate options for the given element.
+ *
+ * @param {HTMLElement} element Element to pick up options
+ * from, either a slide or an animation target
+ * @param {Object} [inheritedOptions] Optional set of existing
+ * options
+ */
+ getAutoAnimateOptions( element, inheritedOptions ) {
+
+ let options = {
+ easing: this.Reveal.getConfig().autoAnimateEasing,
+ duration: this.Reveal.getConfig().autoAnimateDuration,
+ delay: 0
+ };
+
+ options = extend( options, inheritedOptions );
+
+ // Inherit options from parent elements
+ if( element.parentNode ) {
+ let autoAnimatedParent = closest( element.parentNode, '[data-auto-animate-target]' );
+ if( autoAnimatedParent ) {
+ options = this.getAutoAnimateOptions( autoAnimatedParent, options );
+ }
+ }
+
+ if( element.dataset.autoAnimateEasing ) {
+ options.easing = element.dataset.autoAnimateEasing;
+ }
+
+ if( element.dataset.autoAnimateDuration ) {
+ options.duration = parseFloat( element.dataset.autoAnimateDuration );
+ }
+
+ if( element.dataset.autoAnimateDelay ) {
+ options.delay = parseFloat( element.dataset.autoAnimateDelay );
+ }
+
+ return options;
+
+ }
+
+ /**
+ * Returns an object containing all of the properties
+ * that can be auto-animated for the given element and
+ * their current computed values.
+ *
+ * @param {String} direction 'from' or 'to'
+ */
+ getAutoAnimatableProperties( direction, element, elementOptions ) {
+
+ let config = this.Reveal.getConfig();
+
+ let properties = { styles: [] };
+
+ // Position and size
+ if( elementOptions.translate !== false || elementOptions.scale !== false ) {
+ let bounds;
+
+ // Custom auto-animate may optionally return a custom tailored
+ // measurement function
+ if( typeof elementOptions.measure === 'function' ) {
+ bounds = elementOptions.measure( element );
+ }
+ else {
+ if( config.center ) {
+ // More precise, but breaks when used in combination
+ // with zoom for scaling the deck ¯\_(ツ)_/¯
+ bounds = element.getBoundingClientRect();
+ }
+ else {
+ let scale = this.Reveal.getScale();
+ bounds = {
+ x: element.offsetLeft * scale,
+ y: element.offsetTop * scale,
+ width: element.offsetWidth * scale,
+ height: element.offsetHeight * scale
+ };
+ }
+ }
+
+ properties.x = bounds.x;
+ properties.y = bounds.y;
+ properties.width = bounds.width;
+ properties.height = bounds.height;
+ }
+
+ const computedStyles = getComputedStyle( element );
+
+ // CSS styles
+ ( elementOptions.styles || config.autoAnimateStyles ).forEach( style => {
+ let value;
+
+ // `style` is either the property name directly, or an object
+ // definition of a style property
+ if( typeof style === 'string' ) style = { property: style };
+
+ if( typeof style.from !== 'undefined' && direction === 'from' ) {
+ value = { value: style.from, explicitValue: true };
+ }
+ else if( typeof style.to !== 'undefined' && direction === 'to' ) {
+ value = { value: style.to, explicitValue: true };
+ }
+ else {
+ value = computedStyles[style.property];
+ }
+
+ if( value !== '' ) {
+ properties.styles[style.property] = value;
+ }
+ } );
+
+ return properties;
+
+ }
+
+ /**
+ * Get a list of all element pairs that we can animate
+ * between the given slides.
+ *
+ * @param {HTMLElement} fromSlide
+ * @param {HTMLElement} toSlide
+ *
+ * @return {Array} Each value is an array where [0] is
+ * the element we're animating from and [1] is the
+ * element we're animating to
+ */
+ getAutoAnimatableElements( fromSlide, toSlide ) {
+
+ let matcher = typeof this.Reveal.getConfig().autoAnimateMatcher === 'function' ? this.Reveal.getConfig().autoAnimateMatcher : this.getAutoAnimatePairs;
+
+ let pairs = matcher.call( this, fromSlide, toSlide );
+
+ let reserved = [];
+
+ // Remove duplicate pairs
+ return pairs.filter( ( pair, index ) => {
+ if( reserved.indexOf( pair.to ) === -1 ) {
+ reserved.push( pair.to );
+ return true;
+ }
+ } );
+
+ }
+
+ /**
+ * Identifies matching elements between slides.
+ *
+ * You can specify a custom matcher function by using
+ * the `autoAnimateMatcher` config option.
+ */
+ getAutoAnimatePairs( fromSlide, toSlide ) {
+
+ let pairs = [];
+
+ const codeNodes = 'pre';
+ const textNodes = 'h1, h2, h3, h4, h5, h6, p, li';
+ const mediaNodes = 'img, video, iframe';
+
+ // Eplicit matches via data-id
+ this.findAutoAnimateMatches( pairs, fromSlide, toSlide, '[data-id]', node => {
+ return node.nodeName + ':::' + node.getAttribute( 'data-id' );
+ } );
+
+ // Text
+ this.findAutoAnimateMatches( pairs, fromSlide, toSlide, textNodes, node => {
+ return node.nodeName + ':::' + node.innerText;
+ } );
+
+ // Media
+ this.findAutoAnimateMatches( pairs, fromSlide, toSlide, mediaNodes, node => {
+ return node.nodeName + ':::' + ( node.getAttribute( 'src' ) || node.getAttribute( 'data-src' ) );
+ } );
+
+ // Code
+ this.findAutoAnimateMatches( pairs, fromSlide, toSlide, codeNodes, node => {
+ return node.nodeName + ':::' + node.innerText;
+ } );
+
+ pairs.forEach( pair => {
+
+ // Disable scale transformations on text nodes, we transition
+ // each individual text property instead
+ if( matches( pair.from, textNodes ) ) {
+ pair.options = { scale: false };
+ }
+ // Animate individual lines of code
+ else if( matches( pair.from, codeNodes ) ) {
+
+ // Transition the code block's width and height instead of scaling
+ // to prevent its content from being squished
+ pair.options = { scale: false, styles: [ 'width', 'height' ] };
+
+ // Lines of code
+ this.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-code', node => {
+ return node.textContent;
+ }, {
+ scale: false,
+ styles: [],
+ measure: this.getLocalBoundingBox.bind( this )
+ } );
+
+ // Line numbers
+ this.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-line[data-line-number]', node => {
+ return node.getAttribute( 'data-line-number' );
+ }, {
+ scale: false,
+ styles: [ 'width' ],
+ measure: this.getLocalBoundingBox.bind( this )
+ } );
+
+ }
+
+ }, this );
+
+ return pairs;
+
+ }
+
+ /**
+ * Helper method which returns a bounding box based on
+ * the given elements offset coordinates.
+ *
+ * @param {HTMLElement} element
+ * @return {Object} x, y, width, height
+ */
+ getLocalBoundingBox( element ) {
+
+ const presentationScale = this.Reveal.getScale();
+
+ return {
+ x: Math.round( ( element.offsetLeft * presentationScale ) * 100 ) / 100,
+ y: Math.round( ( element.offsetTop * presentationScale ) * 100 ) / 100,
+ width: Math.round( ( element.offsetWidth * presentationScale ) * 100 ) / 100,
+ height: Math.round( ( element.offsetHeight * presentationScale ) * 100 ) / 100
+ };
+
+ }
+
+ /**
+ * Finds matching elements between two slides.
+ *
+ * @param {Array} pairs List of pairs to push matches to
+ * @param {HTMLElement} fromScope Scope within the from element exists
+ * @param {HTMLElement} toScope Scope within the to element exists
+ * @param {String} selector CSS selector of the element to match
+ * @param {Function} serializer A function that accepts an element and returns
+ * a stringified ID based on its contents
+ * @param {Object} animationOptions Optional config options for this pair
+ */
+ findAutoAnimateMatches( pairs, fromScope, toScope, selector, serializer, animationOptions ) {
+
+ let fromMatches = {};
+ let toMatches = {};
+
+ [].slice.call( fromScope.querySelectorAll( selector ) ).forEach( ( element, i ) => {
+ const key = serializer( element );
+ if( typeof key === 'string' && key.length ) {
+ fromMatches[key] = fromMatches[key] || [];
+ fromMatches[key].push( element );
+ }
+ } );
+
+ [].slice.call( toScope.querySelectorAll( selector ) ).forEach( ( element, i ) => {
+ const key = serializer( element );
+ toMatches[key] = toMatches[key] || [];
+ toMatches[key].push( element );
+
+ let fromElement;
+
+ // Retrieve the 'from' element
+ if( fromMatches[key] ) {
+ const pimaryIndex = toMatches[key].length - 1;
+ const secondaryIndex = fromMatches[key].length - 1;
+
+ // If there are multiple identical from elements, retrieve
+ // the one at the same index as our to-element.
+ if( fromMatches[key][ pimaryIndex ] ) {
+ fromElement = fromMatches[key][ pimaryIndex ];
+ fromMatches[key][ pimaryIndex ] = null;
+ }
+ // If there are no matching from-elements at the same index,
+ // use the last one.
+ else if( fromMatches[key][ secondaryIndex ] ) {
+ fromElement = fromMatches[key][ secondaryIndex ];
+ fromMatches[key][ secondaryIndex ] = null;
+ }
+ }
+
+ // If we've got a matching pair, push it to the list of pairs
+ if( fromElement ) {
+ pairs.push({
+ from: fromElement,
+ to: element,
+ options: animationOptions
+ });
+ }
+ } );
+
+ }
+
+ /**
+ * Returns a all elements within the given scope that should
+ * be considered unmatched in an auto-animate transition. If
+ * fading of unmatched elements is turned on, these elements
+ * will fade when going between auto-animate slides.
+ *
+ * Note that parents of auto-animate targets are NOT considerd
+ * unmatched since fading them would break the auto-animation.
+ *
+ * @param {HTMLElement} rootElement
+ * @return {Array}
+ */
+ getUnmatchedAutoAnimateElements( rootElement ) {
+
+ return [].slice.call( rootElement.children ).reduce( ( result, element ) => {
+
+ const containsAnimatedElements = element.querySelector( '[data-auto-animate-target]' );
+
+ // The element is unmatched if
+ // - It is not an auto-animate target
+ // - It does not contain any auto-animate targets
+ if( !element.hasAttribute( 'data-auto-animate-target' ) && !containsAnimatedElements ) {
+ result.push( element );
+ }
+
+ if( element.querySelector( '[data-auto-animate-target]' ) ) {
+ result = result.concat( this.getUnmatchedAutoAnimateElements( element ) );
+ }
+
+ return result;
+
+ }, [] );
+
+ }
+
+}
diff --git a/inst/reveal.js-4.1.2/js/controllers/backgrounds.js b/inst/reveal.js-4.1.2/js/controllers/backgrounds.js
new file mode 100644
index 0000000..f412a18
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/backgrounds.js
@@ -0,0 +1,397 @@
+import { queryAll } from '../utils/util.js'
+import { colorToRgb, colorBrightness } from '../utils/color.js'
+
+/**
+ * Creates and updates slide backgrounds.
+ */
+export default class Backgrounds {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ }
+
+ render() {
+
+ this.element = document.createElement( 'div' );
+ this.element.className = 'backgrounds';
+ this.Reveal.getRevealElement().appendChild( this.element );
+
+ }
+
+ /**
+ * 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.
+ */
+ create() {
+
+ // Clear prior backgrounds
+ this.element.innerHTML = '';
+ this.element.classList.add( 'no-transition' );
+
+ // Iterate over all horizontal slides
+ this.Reveal.getHorizontalSlides().forEach( slideh => {
+
+ let backgroundStack = this.createBackground( slideh, this.element );
+
+ // Iterate over all vertical slides
+ queryAll( slideh, 'section' ).forEach( slidev => {
+
+ this.createBackground( slidev, backgroundStack );
+
+ backgroundStack.classList.add( 'stack' );
+
+ } );
+
+ } );
+
+ // Add parallax background if specified
+ if( this.Reveal.getConfig().parallaxBackgroundImage ) {
+
+ this.element.style.backgroundImage = 'url("' + this.Reveal.getConfig().parallaxBackgroundImage + '")';
+ this.element.style.backgroundSize = this.Reveal.getConfig().parallaxBackgroundSize;
+ this.element.style.backgroundRepeat = this.Reveal.getConfig().parallaxBackgroundRepeat;
+ this.element.style.backgroundPosition = this.Reveal.getConfig().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( () => {
+ this.Reveal.getRevealElement().classList.add( 'has-parallax-background' );
+ }, 1 );
+
+ }
+ else {
+
+ this.element.style.backgroundImage = '';
+ this.Reveal.getRevealElement().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
+ */
+ createBackground( slide, container ) {
+
+ // Main slide background element
+ let element = document.createElement( 'div' );
+ element.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );
+
+ // Inner background element that wraps images/videos/iframes
+ let 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
+ this.sync( slide );
+
+ return element;
+
+ }
+
+ /**
+ * Renders all of the visual properties of a slide background
+ * based on the various background attributes.
+ *
+ * @param {HTMLElement} slide
+ */
+ sync( slide ) {
+
+ const element = slide.slideBackgroundElement,
+ contentElement = slide.slideBackgroundContentElement;
+
+ const 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' ),
+ };
+
+ const dataPreload = slide.hasAttribute( 'data-preload' );
+
+ // 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 = '';
+
+ 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 );
+
+ if( dataPreload ) element.setAttribute( 'data-preload', '' );
+
+ // 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
+ let contrastColor = data.backgroundColor;
+
+ // If no bg color was found, or it cannot be converted by colorToRgb, check the computed background
+ if( !contrastColor || !colorToRgb( contrastColor ) ) {
+ let computedBackgroundStyle = window.getComputedStyle( element );
+ if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
+ contrastColor = computedBackgroundStyle.backgroundColor;
+ }
+ }
+
+ if( contrastColor ) {
+ const 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' );
+ }
+ }
+ }
+
+ }
+
+ /**
+ * 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.
+ */
+ update( includeAll = false ) {
+
+ let currentSlide = this.Reveal.getCurrentSlide();
+ let indices = this.Reveal.getIndices();
+
+ let currentBackground = null;
+
+ // Reverse past/future classes when in RTL mode
+ let horizontalPast = this.Reveal.getConfig().rtl ? 'future' : 'past',
+ horizontalFuture = this.Reveal.getConfig().rtl ? 'past' : 'future';
+
+ // Update the classes of all backgrounds to match the
+ // states of their slides (past/present/future)
+ Array.from( this.element.childNodes ).forEach( ( backgroundh, h ) => {
+
+ backgroundh.classList.remove( 'past', 'present', 'future' );
+
+ if( h < indices.h ) {
+ backgroundh.classList.add( horizontalPast );
+ }
+ else if ( h > indices.h ) {
+ backgroundh.classList.add( horizontalFuture );
+ }
+ else {
+ backgroundh.classList.add( 'present' );
+
+ // Store a reference to the current background element
+ currentBackground = backgroundh;
+ }
+
+ if( includeAll || h === indices.h ) {
+ queryAll( backgroundh, '.slide-background' ).forEach( ( backgroundv, v ) => {
+
+ backgroundv.classList.remove( 'past', 'present', 'future' );
+
+ if( v < indices.v ) {
+ backgroundv.classList.add( 'past' );
+ }
+ else if ( v > indices.v ) {
+ backgroundv.classList.add( 'future' );
+ }
+ else {
+ backgroundv.classList.add( 'present' );
+
+ // Only if this is the present horizontal and vertical slide
+ if( h === indices.h ) currentBackground = backgroundv;
+ }
+
+ } );
+ }
+
+ } );
+
+ // Stop content inside of previous backgrounds
+ if( this.previousBackground ) {
+
+ this.Reveal.slideContent.stopEmbeddedContent( this.previousBackground, { unloadIframes: !this.Reveal.slideContent.shouldPreload( this.previousBackground ) } );
+
+ }
+
+ // Start content in the current background
+ if( currentBackground ) {
+
+ this.Reveal.slideContent.startEmbeddedContent( currentBackground );
+
+ let currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );
+ if( currentBackgroundContent ) {
+
+ let 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.
+ let previousBackgroundHash = this.previousBackground ? this.previousBackground.getAttribute( 'data-background-hash' ) : null;
+ let currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );
+ if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== this.previousBackground ) {
+ this.element.classList.add( 'no-transition' );
+ }
+
+ this.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( classToBubble => {
+ if( currentSlide.classList.contains( classToBubble ) ) {
+ this.Reveal.getRevealElement().classList.add( classToBubble );
+ }
+ else {
+ this.Reveal.getRevealElement().classList.remove( classToBubble );
+ }
+ }, this );
+ }
+
+ // Allow the first background to apply without transition
+ setTimeout( () => {
+ this.element.classList.remove( 'no-transition' );
+ }, 1 );
+
+ }
+
+ /**
+ * Updates the position of the parallax background based
+ * on the current slide index.
+ */
+ updateParallax() {
+
+ let indices = this.Reveal.getIndices();
+
+ if( this.Reveal.getConfig().parallaxBackgroundImage ) {
+
+ let horizontalSlides = this.Reveal.getHorizontalSlides(),
+ verticalSlides = this.Reveal.getVerticalSlides();
+
+ let backgroundSize = this.element.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 );
+ }
+
+ let slideWidth = this.element.offsetWidth,
+ horizontalSlideCount = horizontalSlides.length,
+ horizontalOffsetMultiplier,
+ horizontalOffset;
+
+ if( typeof this.Reveal.getConfig().parallaxBackgroundHorizontal === 'number' ) {
+ horizontalOffsetMultiplier = this.Reveal.getConfig().parallaxBackgroundHorizontal;
+ }
+ else {
+ horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;
+ }
+
+ horizontalOffset = horizontalOffsetMultiplier * indices.h * -1;
+
+ let slideHeight = this.element.offsetHeight,
+ verticalSlideCount = verticalSlides.length,
+ verticalOffsetMultiplier,
+ verticalOffset;
+
+ if( typeof this.Reveal.getConfig().parallaxBackgroundVertical === 'number' ) {
+ verticalOffsetMultiplier = this.Reveal.getConfig().parallaxBackgroundVertical;
+ }
+ else {
+ verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );
+ }
+
+ verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indices.v : 0;
+
+ this.element.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';
+
+ }
+
+ }
+
+}
diff --git a/inst/reveal.js-4.1.2/js/controllers/controls.js b/inst/reveal.js-4.1.2/js/controllers/controls.js
new file mode 100644
index 0000000..556bcf0
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/controls.js
@@ -0,0 +1,259 @@
+import { queryAll } from '../utils/util.js'
+import { isAndroid } from '../utils/device.js'
+
+/**
+ * Manages our presentation controls. This includes both
+ * the built-in control arrows as well as event monitoring
+ * of any elements within the presentation with either of the
+ * following helper classes:
+ * - .navigate-up
+ * - .navigate-right
+ * - .navigate-down
+ * - .navigate-left
+ * - .navigate-next
+ * - .navigate-prev
+ */
+export default class Controls {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ this.onNavigateLeftClicked = this.onNavigateLeftClicked.bind( this );
+ this.onNavigateRightClicked = this.onNavigateRightClicked.bind( this );
+ this.onNavigateUpClicked = this.onNavigateUpClicked.bind( this );
+ this.onNavigateDownClicked = this.onNavigateDownClicked.bind( this );
+ this.onNavigatePrevClicked = this.onNavigatePrevClicked.bind( this );
+ this.onNavigateNextClicked = this.onNavigateNextClicked.bind( this );
+
+ }
+
+ render() {
+
+ const rtl = this.Reveal.getConfig().rtl;
+ const revealElement = this.Reveal.getRevealElement();
+
+ this.element = document.createElement( 'aside' );
+ this.element.className = 'controls';
+ this.element.innerHTML =
+ `<button class="navigate-left" aria-label="${ rtl ? 'next slide' : 'previous slide' }"><div class="controls-arrow"></div></button>
+ <button class="navigate-right" aria-label="${ rtl ? 'previous slide' : '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>`;
+
+ this.Reveal.getRevealElement().appendChild( this.element );
+
+ // There can be multiple instances of controls throughout the page
+ this.controlsLeft = queryAll( revealElement, '.navigate-left' );
+ this.controlsRight = queryAll( revealElement, '.navigate-right' );
+ this.controlsUp = queryAll( revealElement, '.navigate-up' );
+ this.controlsDown = queryAll( revealElement, '.navigate-down' );
+ this.controlsPrev = queryAll( revealElement, '.navigate-prev' );
+ this.controlsNext = queryAll( revealElement, '.navigate-next' );
+
+ // The left, right and down arrows in the standard reveal.js controls
+ this.controlsRightArrow = this.element.querySelector( '.navigate-right' );
+ this.controlsLeftArrow = this.element.querySelector( '.navigate-left' );
+ this.controlsDownArrow = this.element.querySelector( '.navigate-down' );
+
+ }
+
+ /**
+ * Called when the reveal.js config is updated.
+ */
+ configure( config, oldConfig ) {
+
+ this.element.style.display = config.controls ? 'block' : 'none';
+
+ this.element.setAttribute( 'data-controls-layout', config.controlsLayout );
+ this.element.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );
+
+ }
+
+ bind() {
+
+ // Listen to both touch and click events, in case the device
+ // supports both
+ let pointerEvents = [ 'touchstart', 'click' ];
+
+ // Only support touch for Android, fixes double navigations in
+ // stock browser
+ if( isAndroid ) {
+ pointerEvents = [ 'touchstart' ];
+ }
+
+ pointerEvents.forEach( eventName => {
+ this.controlsLeft.forEach( el => el.addEventListener( eventName, this.onNavigateLeftClicked, false ) );
+ this.controlsRight.forEach( el => el.addEventListener( eventName, this.onNavigateRightClicked, false ) );
+ this.controlsUp.forEach( el => el.addEventListener( eventName, this.onNavigateUpClicked, false ) );
+ this.controlsDown.forEach( el => el.addEventListener( eventName, this.onNavigateDownClicked, false ) );
+ this.controlsPrev.forEach( el => el.addEventListener( eventName, this.onNavigatePrevClicked, false ) );
+ this.controlsNext.forEach( el => el.addEventListener( eventName, this.onNavigateNextClicked, false ) );
+ } );
+
+ }
+
+ unbind() {
+
+ [ 'touchstart', 'click' ].forEach( eventName => {
+ this.controlsLeft.forEach( el => el.removeEventListener( eventName, this.onNavigateLeftClicked, false ) );
+ this.controlsRight.forEach( el => el.removeEventListener( eventName, this.onNavigateRightClicked, false ) );
+ this.controlsUp.forEach( el => el.removeEventListener( eventName, this.onNavigateUpClicked, false ) );
+ this.controlsDown.forEach( el => el.removeEventListener( eventName, this.onNavigateDownClicked, false ) );
+ this.controlsPrev.forEach( el => el.removeEventListener( eventName, this.onNavigatePrevClicked, false ) );
+ this.controlsNext.forEach( el => el.removeEventListener( eventName, this.onNavigateNextClicked, false ) );
+ } );
+
+ }
+
+ /**
+ * Updates the state of all control/navigation arrows.
+ */
+ update() {
+
+ let routes = this.Reveal.availableRoutes();
+
+ // Remove the 'enabled' class from all directions
+ [...this.controlsLeft, ...this.controlsRight, ...this.controlsUp, ...this.controlsDown, ...this.controlsPrev, ...this.controlsNext].forEach( node => {
+ node.classList.remove( 'enabled', '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 ) this.controlsLeft.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( routes.right ) this.controlsRight.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( routes.up ) this.controlsUp.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( routes.down ) this.controlsDown.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+
+ // Prev/next buttons
+ if( routes.left || routes.up ) this.controlsPrev.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( routes.right || routes.down ) this.controlsNext.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );
+
+ // Highlight fragment directions
+ let currentSlide = this.Reveal.getCurrentSlide();
+ if( currentSlide ) {
+
+ let fragmentsRoutes = this.Reveal.fragments.availableRoutes();
+
+ // Always apply fragment decorator to prev/next buttons
+ if( fragmentsRoutes.prev ) this.controlsPrev.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( fragmentsRoutes.next ) this.controlsNext.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+
+ // Apply fragment decorators to directional buttons based on
+ // what slide axis they are in
+ if( this.Reveal.isVerticalSlide( currentSlide ) ) {
+ if( fragmentsRoutes.prev ) this.controlsUp.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( fragmentsRoutes.next ) this.controlsDown.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ }
+ else {
+ if( fragmentsRoutes.prev ) this.controlsLeft.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ if( fragmentsRoutes.next ) this.controlsRight.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );
+ }
+
+ }
+
+ if( this.Reveal.getConfig().controlsTutorial ) {
+
+ let indices = this.Reveal.getIndices();
+
+ // Highlight control arrows with an animation to ensure
+ // that the viewer knows how to navigate
+ if( !this.Reveal.hasNavigatedVertically() && routes.down ) {
+ this.controlsDownArrow.classList.add( 'highlight' );
+ }
+ else {
+ this.controlsDownArrow.classList.remove( 'highlight' );
+
+ if( this.Reveal.getConfig().rtl ) {
+
+ if( !this.Reveal.hasNavigatedHorizontally() && routes.left && indices.v === 0 ) {
+ this.controlsLeftArrow.classList.add( 'highlight' );
+ }
+ else {
+ this.controlsLeftArrow.classList.remove( 'highlight' );
+ }
+
+ } else {
+
+ if( !this.Reveal.hasNavigatedHorizontally() && routes.right && indices.v === 0 ) {
+ this.controlsRightArrow.classList.add( 'highlight' );
+ }
+ else {
+ this.controlsRightArrow.classList.remove( 'highlight' );
+ }
+ }
+ }
+ }
+ }
+
+ /**
+ * Event handlers for navigation control buttons.
+ */
+ onNavigateLeftClicked( event ) {
+
+ event.preventDefault();
+ this.Reveal.onUserInput();
+
+ if( this.Reveal.getConfig().navigationMode === 'linear' ) {
+ this.Reveal.prev();
+ }
+ else {
+ this.Reveal.left();
+ }
+
+ }
+
+ onNavigateRightClicked( event ) {
+
+ event.preventDefault();
+ this.Reveal.onUserInput();
+
+ if( this.Reveal.getConfig().navigationMode === 'linear' ) {
+ this.Reveal.next();
+ }
+ else {
+ this.Reveal.right();
+ }
+
+ }
+
+ onNavigateUpClicked( event ) {
+
+ event.preventDefault();
+ this.Reveal.onUserInput();
+
+ this.Reveal.up();
+
+ }
+
+ onNavigateDownClicked( event ) {
+
+ event.preventDefault();
+ this.Reveal.onUserInput();
+
+ this.Reveal.down();
+
+ }
+
+ onNavigatePrevClicked( event ) {
+
+ event.preventDefault();
+ this.Reveal.onUserInput();
+
+ this.Reveal.prev();
+
+ }
+
+ onNavigateNextClicked( event ) {
+
+ event.preventDefault();
+ this.Reveal.onUserInput();
+
+ this.Reveal.next();
+
+ }
+
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/controllers/focus.js b/inst/reveal.js-4.1.2/js/controllers/focus.js
new file mode 100644
index 0000000..2191807
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/focus.js
@@ -0,0 +1,97 @@
+import { closest } from '../utils/util.js'
+
+/**
+ * Manages focus when a presentation is embedded. This
+ * helps us only capture keyboard from the presentation
+ * a user is currently interacting with in a page where
+ * multiple presentations are embedded.
+ */
+
+const STATE_FOCUS = 'focus';
+const STATE_BLUR = 'blur';
+
+export default class Focus {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ this.onRevealPointerDown = this.onRevealPointerDown.bind( this );
+ this.onDocumentPointerDown = this.onDocumentPointerDown.bind( this );
+
+ }
+
+ /**
+ * Called when the reveal.js config is updated.
+ */
+ configure( config, oldConfig ) {
+
+ if( config.embedded ) {
+ this.blur();
+ }
+ else {
+ this.focus();
+ this.unbind();
+ }
+
+ }
+
+ bind() {
+
+ if( this.Reveal.getConfig().embedded ) {
+ this.Reveal.getRevealElement().addEventListener( 'pointerdown', this.onRevealPointerDown, false );
+ }
+
+ }
+
+ unbind() {
+
+ this.Reveal.getRevealElement().removeEventListener( 'pointerdown', this.onRevealPointerDown, false );
+ document.removeEventListener( 'pointerdown', this.onDocumentPointerDown, false );
+
+ }
+
+ focus() {
+
+ if( this.state !== STATE_FOCUS ) {
+ this.Reveal.getRevealElement().classList.add( 'focused' );
+ document.addEventListener( 'pointerdown', this.onDocumentPointerDown, false );
+ }
+
+ this.state = STATE_FOCUS;
+
+ }
+
+ blur() {
+
+ if( this.state !== STATE_BLUR ) {
+ this.Reveal.getRevealElement().classList.remove( 'focused' );
+ document.removeEventListener( 'pointerdown', this.onDocumentPointerDown, false );
+ }
+
+ this.state = STATE_BLUR;
+
+ }
+
+ isFocused() {
+
+ return this.state === STATE_FOCUS;
+
+ }
+
+ onRevealPointerDown( event ) {
+
+ this.focus();
+
+ }
+
+ onDocumentPointerDown( event ) {
+
+ let revealElement = closest( event.target, '.reveal' );
+ if( !revealElement || revealElement !== this.Reveal.getRevealElement() ) {
+ this.blur();
+ }
+
+ }
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/controllers/fragments.js b/inst/reveal.js-4.1.2/js/controllers/fragments.js
new file mode 100644
index 0000000..796c168
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/fragments.js
@@ -0,0 +1,376 @@
+import { extend, queryAll } from '../utils/util.js'
+
+/**
+ * Handles sorting and navigation of slide fragments.
+ * Fragments are elements within a slide that are
+ * revealed/animated incrementally.
+ */
+export default class Fragments {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ }
+
+ /**
+ * Called when the reveal.js config is updated.
+ */
+ configure( config, oldConfig ) {
+
+ if( config.fragments === false ) {
+ this.disable();
+ }
+ else if( oldConfig.fragments === false ) {
+ this.enable();
+ }
+
+ }
+
+ /**
+ * If fragments are disabled in the deck, they should all be
+ * visible rather than stepped through.
+ */
+ disable() {
+
+ queryAll( this.Reveal.getSlidesElement(), '.fragment' ).forEach( element => {
+ element.classList.add( 'visible' );
+ element.classList.remove( 'current-fragment' );
+ } );
+
+ }
+
+ /**
+ * Reverse of #disable(). Only called if fragments have
+ * previously been disabled.
+ */
+ enable() {
+
+ queryAll( this.Reveal.getSlidesElement(), '.fragment' ).forEach( element => {
+ element.classList.remove( 'visible' );
+ element.classList.remove( 'current-fragment' );
+ } );
+
+ }
+
+ /**
+ * Returns an object describing the available fragment
+ * directions.
+ *
+ * @return {{prev: boolean, next: boolean}}
+ */
+ availableRoutes() {
+
+ let currentSlide = this.Reveal.getCurrentSlide();
+ if( currentSlide && this.Reveal.getConfig().fragments ) {
+ let fragments = currentSlide.querySelectorAll( '.fragment:not(.disabled)' );
+ let hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.disabled):not(.visible)' );
+
+ return {
+ prev: fragments.length - hiddenFragments.length > 0,
+ next: !!hiddenFragments.length
+ };
+ }
+ else {
+ return { prev: false, next: false };
+ }
+
+ }
+
+ /**
+ * 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
+ */
+ sort( fragments, grouped = false ) {
+
+ fragments = Array.from( fragments );
+
+ let ordered = [],
+ unordered = [],
+ sorted = [];
+
+ // Group ordered and unordered elements
+ fragments.forEach( fragment => {
+ if( fragment.hasAttribute( 'data-fragment-index' ) ) {
+ let 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
+ let index = 0;
+
+ // Push all fragments in their sorted order to an array,
+ // this flattens the groups
+ ordered.forEach( group => {
+ group.forEach( fragment => {
+ sorted.push( fragment );
+ fragment.setAttribute( 'data-fragment-index', index );
+ } );
+
+ index ++;
+ } );
+
+ return grouped === true ? ordered : sorted;
+
+ }
+
+ /**
+ * Sorts and formats all of fragments in the
+ * presentation.
+ */
+ sortAll() {
+
+ this.Reveal.getHorizontalSlides().forEach( horizontalSlide => {
+
+ let verticalSlides = queryAll( horizontalSlide, 'section' );
+ verticalSlides.forEach( ( verticalSlide, y ) => {
+
+ this.sort( verticalSlide.querySelectorAll( '.fragment' ) );
+
+ }, this );
+
+ if( verticalSlides.length === 0 ) this.sort( horizontalSlide.querySelectorAll( '.fragment' ) );
+
+ } );
+
+ }
+
+ /**
+ * 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}}
+ */
+ update( index, fragments ) {
+
+ let changedFragments = {
+ shown: [],
+ hidden: []
+ };
+
+ let currentSlide = this.Reveal.getCurrentSlide();
+ if( currentSlide && this.Reveal.getConfig().fragments ) {
+
+ fragments = fragments || this.sort( currentSlide.querySelectorAll( '.fragment' ) );
+
+ if( fragments.length ) {
+
+ let maxIndex = 0;
+
+ if( typeof index !== 'number' ) {
+ let currentFragment = this.sort( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
+ if( currentFragment ) {
+ index = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
+ }
+ }
+
+ Array.from( fragments ).forEach( ( el, i ) => {
+
+ if( el.hasAttribute( 'data-fragment-index' ) ) {
+ i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
+ }
+
+ maxIndex = Math.max( maxIndex, i );
+
+ // Visible fragments
+ if( i <= index ) {
+ let wasVisible = el.classList.contains( 'visible' )
+ el.classList.add( 'visible' );
+ el.classList.remove( 'current-fragment' );
+
+ if( i === index ) {
+ // Announce the fragments one by one to the Screen Reader
+ this.Reveal.announceStatus( this.Reveal.getStatusText( el ) );
+
+ el.classList.add( 'current-fragment' );
+ this.Reveal.slideContent.startEmbeddedContent( el );
+ }
+
+ if( !wasVisible ) {
+ changedFragments.shown.push( el )
+ this.Reveal.dispatchEvent({
+ target: el,
+ type: 'visible',
+ bubbles: false
+ });
+ }
+ }
+ // Hidden fragments
+ else {
+ let wasVisible = el.classList.contains( 'visible' )
+ el.classList.remove( 'visible' );
+ el.classList.remove( 'current-fragment' );
+
+ if( wasVisible ) {
+ this.Reveal.slideContent.stopEmbeddedContent( el );
+ changedFragments.hidden.push( el );
+ this.Reveal.dispatchEvent({
+ target: el,
+ type: 'hidden',
+ bubbles: false
+ });
+ }
+ }
+
+ } );
+
+ // Write the current fragment index to the slide <section>.
+ // This can be used by end users to apply styles based on
+ // the current fragment index.
+ index = typeof index === 'number' ? index : -1;
+ index = Math.max( Math.min( index, maxIndex ), -1 );
+ currentSlide.setAttribute( 'data-fragment', index );
+
+ }
+
+ }
+
+ return changedFragments;
+
+ }
+
+ /**
+ * 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
+ */
+ sync( slide = this.Reveal.getCurrentSlide() ) {
+
+ return this.sort( slide.querySelectorAll( '.fragment' ) );
+
+ }
+
+ /**
+ * 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
+ */
+ goto( index, offset = 0 ) {
+
+ let currentSlide = this.Reveal.getCurrentSlide();
+ if( currentSlide && this.Reveal.getConfig().fragments ) {
+
+ let fragments = this.sort( currentSlide.querySelectorAll( '.fragment:not(.disabled)' ) );
+ if( fragments.length ) {
+
+ // If no index is specified, find the current
+ if( typeof index !== 'number' ) {
+ let lastVisibleFragment = this.sort( currentSlide.querySelectorAll( '.fragment:not(.disabled).visible' ) ).pop();
+
+ if( lastVisibleFragment ) {
+ index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
+ }
+ else {
+ index = -1;
+ }
+ }
+
+ // Apply the offset if there is one
+ index += offset;
+
+ let changedFragments = this.update( index, fragments );
+
+ if( changedFragments.hidden.length ) {
+ this.Reveal.dispatchEvent({
+ type: 'fragmenthidden',
+ data: {
+ fragment: changedFragments.hidden[0],
+ fragments: changedFragments.hidden
+ }
+ });
+ }
+
+ if( changedFragments.shown.length ) {
+ this.Reveal.dispatchEvent({
+ type: 'fragmentshown',
+ data: {
+ fragment: changedFragments.shown[0],
+ fragments: changedFragments.shown
+ }
+ });
+ }
+
+ this.Reveal.controls.update();
+ this.Reveal.progress.update();
+
+ if( this.Reveal.getConfig().fragmentInURL ) {
+ this.Reveal.location.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
+ */
+ next() {
+
+ return this.goto( null, 1 );
+
+ }
+
+ /**
+ * Navigate to the previous slide fragment.
+ *
+ * @return {boolean} true if there was a previous fragment,
+ * false otherwise
+ */
+ prev() {
+
+ return this.goto( null, -1 );
+
+ }
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/controllers/keyboard.js b/inst/reveal.js-4.1.2/js/controllers/keyboard.js
new file mode 100644
index 0000000..70b361f
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/keyboard.js
@@ -0,0 +1,388 @@
+import { enterFullscreen } from '../utils/util.js'
+
+/**
+ * Handles all reveal.js keyboard interactions.
+ */
+export default class Keyboard {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ // A key:value map of keyboard keys and descriptions of
+ // the actions they trigger
+ this.shortcuts = {};
+
+ // Holds custom key code mappings
+ this.bindings = {};
+
+ this.onDocumentKeyDown = this.onDocumentKeyDown.bind( this );
+ this.onDocumentKeyPress = this.onDocumentKeyPress.bind( this );
+
+ }
+
+ /**
+ * Called when the reveal.js config is updated.
+ */
+ configure( config, oldConfig ) {
+
+ if( config.navigationMode === 'linear' ) {
+ this.shortcuts['→ , ↓ , SPACE , N , L , J'] = 'Next slide';
+ this.shortcuts['← , ↑ , P , H , K'] = 'Previous slide';
+ }
+ else {
+ this.shortcuts['N , SPACE'] = 'Next slide';
+ this.shortcuts['P'] = 'Previous slide';
+ this.shortcuts['← , H'] = 'Navigate left';
+ this.shortcuts['→ , L'] = 'Navigate right';
+ this.shortcuts['↑ , K'] = 'Navigate up';
+ this.shortcuts['↓ , J'] = 'Navigate down';
+ }
+
+ this.shortcuts['Home , Shift ←'] = 'First slide';
+ this.shortcuts['End , Shift →'] = 'Last slide';
+ this.shortcuts['B , .'] = 'Pause';
+ this.shortcuts['F'] = 'Fullscreen';
+ this.shortcuts['ESC, O'] = 'Slide overview';
+
+ }
+
+ /**
+ * Starts listening for keyboard events.
+ */
+ bind() {
+
+ document.addEventListener( 'keydown', this.onDocumentKeyDown, false );
+ document.addEventListener( 'keypress', this.onDocumentKeyPress, false );
+
+ }
+
+ /**
+ * Stops listening for keyboard events.
+ */
+ unbind() {
+
+ document.removeEventListener( 'keydown', this.onDocumentKeyDown, false );
+ document.removeEventListener( 'keypress', this.onDocumentKeyPress, false );
+
+ }
+
+ /**
+ * Add a custom key binding with optional description to
+ * be added to the help screen.
+ */
+ addKeyBinding( binding, callback ) {
+
+ if( typeof binding === 'object' && binding.keyCode ) {
+ this.bindings[binding.keyCode] = {
+ callback: callback,
+ key: binding.key,
+ description: binding.description
+ };
+ }
+ else {
+ this.bindings[binding] = {
+ callback: callback,
+ key: null,
+ description: null
+ };
+ }
+
+ }
+
+ /**
+ * Removes the specified custom key binding.
+ */
+ removeKeyBinding( keyCode ) {
+
+ delete this.bindings[keyCode];
+
+ }
+
+ /**
+ * Programmatically triggers a keyboard event
+ *
+ * @param {int} keyCode
+ */
+ triggerKey( keyCode ) {
+
+ this.onDocumentKeyDown( { keyCode } );
+
+ }
+
+ /**
+ * Registers a new shortcut to include in the help overlay
+ *
+ * @param {String} key
+ * @param {String} value
+ */
+ registerKeyboardShortcut( key, value ) {
+
+ this.shortcuts[key] = value;
+
+ }
+
+ getShortcuts() {
+
+ return this.shortcuts;
+
+ }
+
+ getBindings() {
+
+ return this.bindings;
+
+ }
+
+ /**
+ * Handler for the document level 'keypress' event.
+ *
+ * @param {object} event
+ */
+ onDocumentKeyPress( event ) {
+
+ // Check if the pressed key is question mark
+ if( event.shiftKey && event.charCode === 63 ) {
+ this.Reveal.toggleHelp();
+ }
+
+ }
+
+ /**
+ * Handler for the document level 'keydown' event.
+ *
+ * @param {object} event
+ */
+ onDocumentKeyDown( event ) {
+
+ let config = this.Reveal.getConfig();
+
+ // If there's a condition specified and it returns false,
+ // ignore this event
+ if( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {
+ return true;
+ }
+
+ // If keyboardCondition is set, only capture keyboard events
+ // for embedded decks when they are focused
+ if( config.keyboardCondition === 'focused' && !this.Reveal.isFocused() ) {
+ return true;
+ }
+
+ // Shorthand
+ let keyCode = event.keyCode;
+
+ // Remember if auto-sliding was paused so we can toggle it
+ let autoSlideWasPaused = !this.Reveal.isAutoSliding();
+
+ this.Reveal.onUserInput( event );
+
+ // Is there a focused element that could be using the keyboard?
+ let activeElementIsCE = document.activeElement && document.activeElement.isContentEditable === true;
+ let activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );
+ let activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);
+
+ // Whitelist specific modified + keycode combinations
+ let prevSlideShortcut = event.shiftKey && event.keyCode === 32;
+ let firstSlideShortcut = event.shiftKey && keyCode === 37;
+ let lastSlideShortcut = event.shiftKey && keyCode === 39;
+
+ // Prevent all other events when a modifier is pressed
+ let 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', '.'
+ let resumeKeyCodes = [66,86,190,191];
+ let 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( this.Reveal.isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {
+ return false;
+ }
+
+ // Use linear navigation if we're configured to OR if
+ // the presentation is one-dimensional
+ let useLinearMode = config.navigationMode === 'linear' || !this.Reveal.hasHorizontalSlides() || !this.Reveal.hasVerticalSlides();
+
+ let 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 ) {
+
+ let 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 this.Reveal[ value ] === 'function' ) {
+ this.Reveal[ value ].call();
+ }
+
+ triggered = true;
+
+ }
+
+ }
+
+ }
+
+ // 2. Registered custom key bindings
+ if( triggered === false ) {
+
+ for( key in this.bindings ) {
+
+ // Check if this binding matches the pressed key
+ if( parseInt( key, 10 ) === keyCode ) {
+
+ let action = this.bindings[ key ].callback;
+
+ // Callback function
+ if( typeof action === 'function' ) {
+ action.apply( null, [ event ] );
+ }
+ // String shortcuts to reveal.js API
+ else if( typeof action === 'string' && typeof this.Reveal[ action ] === 'function' ) {
+ this.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 ) {
+ this.Reveal.prev();
+ }
+ // N, PAGE DOWN
+ else if( keyCode === 78 || keyCode === 34 ) {
+ this.Reveal.next();
+ }
+ // H, LEFT
+ else if( keyCode === 72 || keyCode === 37 ) {
+ if( firstSlideShortcut ) {
+ this.Reveal.slide( 0 );
+ }
+ else if( !this.Reveal.overview.isActive() && useLinearMode ) {
+ this.Reveal.prev();
+ }
+ else {
+ this.Reveal.left();
+ }
+ }
+ // L, RIGHT
+ else if( keyCode === 76 || keyCode === 39 ) {
+ if( lastSlideShortcut ) {
+ this.Reveal.slide( Number.MAX_VALUE );
+ }
+ else if( !this.Reveal.overview.isActive() && useLinearMode ) {
+ this.Reveal.next();
+ }
+ else {
+ this.Reveal.right();
+ }
+ }
+ // K, UP
+ else if( keyCode === 75 || keyCode === 38 ) {
+ if( !this.Reveal.overview.isActive() && useLinearMode ) {
+ this.Reveal.prev();
+ }
+ else {
+ this.Reveal.up();
+ }
+ }
+ // J, DOWN
+ else if( keyCode === 74 || keyCode === 40 ) {
+ if( !this.Reveal.overview.isActive() && useLinearMode ) {
+ this.Reveal.next();
+ }
+ else {
+ this.Reveal.down();
+ }
+ }
+ // HOME
+ else if( keyCode === 36 ) {
+ this.Reveal.slide( 0 );
+ }
+ // END
+ else if( keyCode === 35 ) {
+ this.Reveal.slide( Number.MAX_VALUE );
+ }
+ // SPACE
+ else if( keyCode === 32 ) {
+ if( this.Reveal.overview.isActive() ) {
+ this.Reveal.overview.deactivate();
+ }
+ if( event.shiftKey ) {
+ this.Reveal.prev();
+ }
+ else {
+ this.Reveal.next();
+ }
+ }
+ // 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 ) {
+ this.Reveal.togglePause();
+ }
+ // F
+ else if( keyCode === 70 ) {
+ enterFullscreen( config.embedded ? this.Reveal.getViewportElement() : document.documentElement );
+ }
+ // A
+ else if( keyCode === 65 ) {
+ if ( config.autoSlideStoppable ) {
+ this.Reveal.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 ) {
+ if( this.Reveal.closeOverlay() === false ) {
+ this.Reveal.overview.toggle();
+ }
+
+ event.preventDefault && event.preventDefault();
+ }
+
+ // If auto-sliding is enabled we need to cue up
+ // another timeout
+ this.Reveal.cueAutoSlide();
+
+ }
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/controllers/location.js b/inst/reveal.js-4.1.2/js/controllers/location.js
new file mode 100644
index 0000000..42fff62
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/location.js
@@ -0,0 +1,209 @@
+/**
+ * Reads and writes the URL based on reveal.js' current state.
+ */
+export default class Location {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ // Delays updates to the URL due to a Chrome thumbnailer bug
+ this.writeURLTimeout = 0;
+
+ this.onWindowHashChange = this.onWindowHashChange.bind( this );
+
+ }
+
+ bind() {
+
+ window.addEventListener( 'hashchange', this.onWindowHashChange, false );
+
+ }
+
+ unbind() {
+
+ window.removeEventListener( 'hashchange', this.onWindowHashChange, false );
+
+ }
+
+ /**
+ * Reads the current URL (hash) and navigates accordingly.
+ */
+ readURL() {
+
+ let config = this.Reveal.getConfig();
+ let indices = this.Reveal.getIndices();
+ let currentSlide = this.Reveal.getCurrentSlide();
+
+ let hash = window.location.hash;
+
+ // Attempt to parse the hash as either an index or name
+ let 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]*$/.test( bits[0] ) && name.length ) {
+ let element;
+
+ let f;
+
+ // Parse named links with fragments (#/named-link/2)
+ if( /\/[-\d]+$/g.test( name ) ) {
+ f = parseInt( name.split( '/' ).pop(), 10 );
+ f = isNaN(f) ? undefined : f;
+ name = name.split( '/' ).shift();
+ }
+
+ // 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
+ let isSameNameAsCurrentSlide = currentSlide ? currentSlide.getAttribute( 'id' ) === name : false;
+
+ if( element ) {
+ // If the slide exists and is not the current slide...
+ if ( !isSameNameAsCurrentSlide || typeof f !== 'undefined' ) {
+ // ...find the position of the named slide and navigate to it
+ let slideIndices = this.Reveal.getIndices( element );
+ this.Reveal.slide( slideIndices.h, slideIndices.v, f );
+ }
+ }
+ // If the slide doesn't exist, navigate to the current slide
+ else {
+ this.Reveal.slide( indices.h || 0, indices.v || 0 );
+ }
+ }
+ else {
+ let hashIndexBase = config.hashOneBasedIndex ? 1 : 0;
+
+ // Read the index components of the hash
+ let 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 !== indices.h || v !== indices.v || f !== undefined ) {
+ this.Reveal.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
+ */
+ writeURL( delay ) {
+
+ let config = this.Reveal.getConfig();
+ let currentSlide = this.Reveal.getCurrentSlide();
+
+ // Make sure there's never more than one timeout running
+ clearTimeout( this.writeURLTimeout );
+
+ // If a delay is specified, timeout this call
+ if( typeof delay === 'number' ) {
+ this.writeURLTimeout = setTimeout( this.writeURL, delay );
+ }
+ else if( currentSlide ) {
+
+ let hash = this.getHash();
+
+ // If we're configured to push to history OR the history
+ // API is not avaialble.
+ if( config.history ) {
+ window.location.hash = hash;
+ }
+ // If we're configured to reflect the current slide in the
+ // URL without pushing to history.
+ else if( config.hash ) {
+ // If the hash is empty, don't add it to the URL
+ if( hash === '/' ) {
+ window.history.replaceState( null, null, window.location.pathname + window.location.search );
+ }
+ else {
+ window.history.replaceState( null, null, '#' + hash );
+ }
+ }
+ // UPDATE: The below nuking of all hash changes breaks
+ // anchors on pages where reveal.js is running. Removed
+ // in 4.0. Why was it here in the first place? ¯\_(ツ)_/¯
+ //
+ // 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 );
+ // }
+
+ }
+
+ }
+
+ /**
+ * Return a hash URL that will resolve to the given slide location.
+ *
+ * @param {HTMLElement} [slide=currentSlide] The slide to link to
+ */
+ getHash( slide ) {
+
+ let url = '/';
+
+ // Attempt to create a named link based on the slide's ID
+ let s = slide || this.Reveal.getCurrentSlide();
+ let id = s ? s.getAttribute( 'id' ) : null;
+ if( id ) {
+ id = encodeURIComponent( id );
+ }
+
+ let index = this.Reveal.getIndices( slide );
+ if( !this.Reveal.getConfig().fragmentInURL ) {
+ index.f = undefined;
+ }
+
+ // 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 ) {
+ url = '/' + id;
+
+ // If there is also a fragment, append that at the end
+ // of the named link, like: #/named-link/2
+ if( index.f >= 0 ) url += '/' + index.f;
+ }
+ // Otherwise use the /h/v index
+ else {
+ let hashIndexBase = this.Reveal.getConfig().hashOneBasedIndex ? 1 : 0;
+ if( index.h > 0 || index.v > 0 || index.f >= 0 ) url += index.h + hashIndexBase;
+ if( index.v > 0 || index.f >= 0 ) url += '/' + (index.v + hashIndexBase );
+ if( index.f >= 0 ) url += '/' + index.f;
+ }
+
+ return url;
+
+ }
+
+ /**
+ * Handler for the window level 'hashchange' event.
+ *
+ * @param {object} [event]
+ */
+ onWindowHashChange( event ) {
+
+ this.readURL();
+
+ }
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/controllers/notes.js b/inst/reveal.js-4.1.2/js/controllers/notes.js
new file mode 100644
index 0000000..8ec1d42
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/notes.js
@@ -0,0 +1,114 @@
+/**
+ * Handles the showing and
+ */
+export default class Notes {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ }
+
+ render() {
+
+ this.element = document.createElement( 'div' );
+ this.element.className = 'speaker-notes';
+ this.element.setAttribute( 'data-prevent-swipe', '' );
+ this.element.setAttribute( 'tabindex', '0' );
+ this.Reveal.getRevealElement().appendChild( this.element );
+
+ }
+
+ /**
+ * Called when the reveal.js config is updated.
+ */
+ configure( config, oldConfig ) {
+
+ if( config.showNotes ) {
+ this.element.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );
+ }
+
+ }
+
+ /**
+ * Pick up notes from the current slide and display them
+ * to the viewer.
+ *
+ * @see {@link config.showNotes}
+ */
+ update() {
+
+ if( this.Reveal.getConfig().showNotes && this.element && this.Reveal.getCurrentSlide() && !this.Reveal.print.isPrintingPDF() ) {
+
+ this.element.innerHTML = this.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.
+ */
+ updateVisibility() {
+
+ if( this.Reveal.getConfig().showNotes && this.hasNotes() && !this.Reveal.print.isPrintingPDF() ) {
+ this.Reveal.getRevealElement().classList.add( 'show-notes' );
+ }
+ else {
+ this.Reveal.getRevealElement().classList.remove( 'show-notes' );
+ }
+
+ }
+
+ /**
+ * Checks if there are speaker notes for ANY slide in the
+ * presentation.
+ */
+ hasNotes() {
+
+ return this.Reveal.getSlidesElement().querySelectorAll( '[data-notes], aside.notes' ).length > 0;
+
+ }
+
+ /**
+ * Checks if this presentation is running inside of the
+ * speaker notes window.
+ *
+ * @return {boolean}
+ */
+ isSpeakerNotesWindow() {
+
+ return !!window.location.search.match( /receiver/gi );
+
+ }
+
+ /**
+ * 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)}
+ */
+ getSlideNotes( slide = this.Reveal.getCurrentSlide() ) {
+
+ // 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
+ let notesElement = slide.querySelector( 'aside.notes' );
+ if( notesElement ) {
+ return notesElement.innerHTML;
+ }
+
+ return null;
+
+ }
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/controllers/overview.js b/inst/reveal.js-4.1.2/js/controllers/overview.js
new file mode 100644
index 0000000..30e4c63
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/overview.js
@@ -0,0 +1,255 @@
+import { SLIDES_SELECTOR } from '../utils/constants.js'
+import { extend, queryAll, transformElement } from '../utils/util.js'
+
+/**
+ * Handles all logic related to the overview mode
+ * (birds-eye view of all slides).
+ */
+export default class Overview {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ this.active = false;
+
+ this.onSlideClicked = this.onSlideClicked.bind( this );
+
+ }
+
+ /**
+ * Displays the overview of slides (quick nav) by scaling
+ * down and arranging all slide elements.
+ */
+ activate() {
+
+ // Only proceed if enabled in config
+ if( this.Reveal.getConfig().overview && !this.isActive() ) {
+
+ this.active = true;
+
+ this.Reveal.getRevealElement().classList.add( 'overview' );
+
+ // Don't auto-slide while in overview mode
+ this.Reveal.cancelAutoSlide();
+
+ // Move the backgrounds element into the slide container to
+ // that the same scaling is applied
+ this.Reveal.getSlidesElement().appendChild( this.Reveal.getBackgroundsElement() );
+
+ // Clicking on an overview slide navigates to it
+ queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( slide => {
+ if( !slide.classList.contains( 'stack' ) ) {
+ slide.addEventListener( 'click', this.onSlideClicked, true );
+ }
+ } );
+
+ // Calculate slide sizes
+ const margin = 70;
+ const slideSize = this.Reveal.getComputedSlideSize();
+ this.overviewSlideWidth = slideSize.width + margin;
+ this.overviewSlideHeight = slideSize.height + margin;
+
+ // Reverse in RTL mode
+ if( this.Reveal.getConfig().rtl ) {
+ this.overviewSlideWidth = -this.overviewSlideWidth;
+ }
+
+ this.Reveal.updateSlidesVisibility();
+
+ this.layout();
+ this.update();
+
+ this.Reveal.layout();
+
+ const indices = this.Reveal.getIndices();
+
+ // Notify observers of the overview showing
+ this.Reveal.dispatchEvent({
+ type: 'overviewshown',
+ data: {
+ 'indexh': indices.h,
+ 'indexv': indices.v,
+ 'currentSlide': this.Reveal.getCurrentSlide()
+ }
+ });
+
+ }
+
+ }
+
+ /**
+ * Uses CSS transforms to position all slides in a grid for
+ * display inside of the overview mode.
+ */
+ layout() {
+
+ // Layout slides
+ this.Reveal.getHorizontalSlides().forEach( ( hslide, h ) => {
+ hslide.setAttribute( 'data-index-h', h );
+ transformElement( hslide, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );
+
+ if( hslide.classList.contains( 'stack' ) ) {
+
+ queryAll( hslide, 'section' ).forEach( ( vslide, v ) => {
+ vslide.setAttribute( 'data-index-h', h );
+ vslide.setAttribute( 'data-index-v', v );
+
+ transformElement( vslide, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );
+ } );
+
+ }
+ } );
+
+ // Layout slide backgrounds
+ Array.from( this.Reveal.getBackgroundsElement().childNodes ).forEach( ( hbackground, h ) => {
+ transformElement( hbackground, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );
+
+ queryAll( hbackground, '.slide-background' ).forEach( ( vbackground, v ) => {
+ transformElement( vbackground, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );
+ } );
+ } );
+
+ }
+
+ /**
+ * Moves the overview viewport to the current slides.
+ * Called each time the current slide changes.
+ */
+ update() {
+
+ const vmin = Math.min( window.innerWidth, window.innerHeight );
+ const scale = Math.max( vmin / 5, 150 ) / vmin;
+ const indices = this.Reveal.getIndices();
+
+ this.Reveal.transformSlides( {
+ overview: [
+ 'scale('+ scale +')',
+ 'translateX('+ ( -indices.h * this.overviewSlideWidth ) +'px)',
+ 'translateY('+ ( -indices.v * this.overviewSlideHeight ) +'px)'
+ ].join( ' ' )
+ } );
+
+ }
+
+ /**
+ * Exits the slide overview and enters the currently
+ * active slide.
+ */
+ deactivate() {
+
+ // Only proceed if enabled in config
+ if( this.Reveal.getConfig().overview ) {
+
+ this.active = false;
+
+ this.Reveal.getRevealElement().classList.remove( 'overview' );
+
+ // Temporarily add a class so that transitions can do different things
+ // depending on whether they are exiting/entering overview, or just
+ // moving from slide to slide
+ this.Reveal.getRevealElement().classList.add( 'overview-deactivating' );
+
+ setTimeout( () => {
+ this.Reveal.getRevealElement().classList.remove( 'overview-deactivating' );
+ }, 1 );
+
+ // Move the background element back out
+ this.Reveal.getRevealElement().appendChild( this.Reveal.getBackgroundsElement() );
+
+ // Clean up changes made to slides
+ queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( slide => {
+ transformElement( slide, '' );
+
+ slide.removeEventListener( 'click', this.onSlideClicked, true );
+ } );
+
+ // Clean up changes made to backgrounds
+ queryAll( this.Reveal.getBackgroundsElement(), '.slide-background' ).forEach( background => {
+ transformElement( background, '' );
+ } );
+
+ this.Reveal.transformSlides( { overview: '' } );
+
+ const indices = this.Reveal.getIndices();
+
+ this.Reveal.slide( indices.h, indices.v );
+ this.Reveal.layout();
+ this.Reveal.cueAutoSlide();
+
+ // Notify observers of the overview hiding
+ this.Reveal.dispatchEvent({
+ type: 'overviewhidden',
+ data: {
+ 'indexh': indices.h,
+ 'indexv': indices.v,
+ 'currentSlide': this.Reveal.getCurrentSlide()
+ }
+ });
+
+ }
+ }
+
+ /**
+ * 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.
+ */
+ toggle( override ) {
+
+ if( typeof override === 'boolean' ) {
+ override ? this.activate() : this.deactivate();
+ }
+ else {
+ this.isActive() ? this.deactivate() : this.activate();
+ }
+
+ }
+
+ /**
+ * Checks if the overview is currently active.
+ *
+ * @return {Boolean} true if the overview is active,
+ * false otherwise
+ */
+ isActive() {
+
+ return this.active;
+
+ }
+
+ /**
+ * Invoked when a slide is and we're in the overview.
+ *
+ * @param {object} event
+ */
+ onSlideClicked( event ) {
+
+ if( this.isActive() ) {
+ event.preventDefault();
+
+ let element = event.target;
+
+ while( element && !element.nodeName.match( /section/gi ) ) {
+ element = element.parentNode;
+ }
+
+ if( element && !element.classList.contains( 'disabled' ) ) {
+
+ this.deactivate();
+
+ if( element.nodeName.match( /section/gi ) ) {
+ let h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
+ v = parseInt( element.getAttribute( 'data-index-v' ), 10 );
+
+ this.Reveal.slide( h, v );
+ }
+
+ }
+ }
+
+ }
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/controllers/plugins.js b/inst/reveal.js-4.1.2/js/controllers/plugins.js
new file mode 100644
index 0000000..7aa6ac4
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/plugins.js
@@ -0,0 +1,241 @@
+import { loadScript } from '../utils/loader.js'
+
+/**
+ * Manages loading and registering of reveal.js plugins.
+ */
+export default class Plugins {
+
+ constructor( reveal ) {
+
+ this.Reveal = reveal;
+
+ // Flags our current state (idle -> loading -> loaded)
+ this.state = 'idle';
+
+ // An id:instance map of currently registed plugins
+ this.registeredPlugins = {};
+
+ this.asyncDependencies = [];
+
+ }
+
+ /**
+ * Loads reveal.js dependencies, registers and
+ * initializes plugins.
+ *
+ * Plugins are direct references to a reveal.js plugin
+ * object that we register and initialize after any
+ * synchronous dependencies have loaded.
+ *
+ * Dependencies are defined via the 'dependencies' config
+ * option and will be loaded prior to starting reveal.js.
+ * Some dependencies may have an 'async' flag, if so they
+ * will load after reveal.js has been started up.
+ */
+ load( plugins, dependencies ) {
+
+ this.state = 'loading';
+
+ plugins.forEach( this.registerPlugin.bind( this ) );
+
+ return new Promise( resolve => {
+
+ let scripts = [],
+ scriptsToLoad = 0;
+
+ dependencies.forEach( s => {
+ // Load if there's no condition or the condition is truthy
+ if( !s.condition || s.condition() ) {
+ if( s.async ) {
+ this.asyncDependencies.push( s );
+ }
+ else {
+ scripts.push( s );
+ }
+ }
+ } );
+
+ if( scripts.length ) {
+ scriptsToLoad = scripts.length;
+
+ const scriptLoadedCallback = (s) => {
+ if( s && typeof s.callback === 'function' ) s.callback();
+
+ if( --scriptsToLoad === 0 ) {
+ this.initPlugins().then( resolve );
+ }
+ };
+
+ // Load synchronous scripts
+ scripts.forEach( s => {
+ if( typeof s.id === 'string' ) {
+ this.registerPlugin( s );
+ scriptLoadedCallback( s );
+ }
+ else if( typeof s.src === 'string' ) {
+ loadScript( s.src, () => scriptLoadedCallback(s) );
+ }
+ else {
+ console.warn( 'Unrecognized plugin format', s );
+ scriptLoadedCallback();
+ }
+ } );
+ }
+ else {
+ this.initPlugins().then( resolve );
+ }
+
+ } );
+
+ }
+
+ /**
+ * Initializes our plugins and waits for them to be ready
+ * before proceeding.
+ */
+ initPlugins() {
+
+ return new Promise( resolve => {
+
+ let pluginValues = Object.values( this.registeredPlugins );
+ let pluginsToInitialize = pluginValues.length;
+
+ // If there are no plugins, skip this step
+ if( pluginsToInitialize === 0 ) {
+ this.loadAsync().then( resolve );
+ }
+ // ... otherwise initialize plugins
+ else {
+
+ let initNextPlugin;
+
+ let afterPlugInitialized = () => {
+ if( --pluginsToInitialize === 0 ) {
+ this.loadAsync().then( resolve );
+ }
+ else {
+ initNextPlugin();
+ }
+ };
+
+ let i = 0;
+
+ // Initialize plugins serially
+ initNextPlugin = () => {
+
+ let plugin = pluginValues[i++];
+
+ // If the plugin has an 'init' method, invoke it
+ if( typeof plugin.init === 'function' ) {
+ let promise = plugin.init( this.Reveal );
+
+ // If the plugin returned a Promise, wait for it
+ if( promise && typeof promise.then === 'function' ) {
+ promise.then( afterPlugInitialized );
+ }
+ else {
+ afterPlugInitialized();
+ }
+ }
+ else {
+ afterPlugInitialized();
+ }
+
+ }
+
+ initNextPlugin();
+
+ }
+
+ } )
+
+ }
+
+ /**
+ * Loads all async reveal.js dependencies.
+ */
+ loadAsync() {
+
+ this.state = 'loaded';
+
+ if( this.asyncDependencies.length ) {
+ this.asyncDependencies.forEach( s => {
+ loadScript( s.src, s.callback );
+ } );
+ }
+
+ return Promise.resolve();
+
+ }
+
+ /**
+ * 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()`.
+ */
+ registerPlugin( plugin ) {
+
+ // Backwards compatibility to make reveal.js ~3.9.0
+ // plugins work with reveal.js 4.0.0
+ if( arguments.length === 2 && typeof arguments[0] === 'string' ) {
+ plugin = arguments[1];
+ plugin.id = arguments[0];
+ }
+ // Plugin can optionally be a function which we call
+ // to create an instance of the plugin
+ else if( typeof plugin === 'function' ) {
+ plugin = plugin();
+ }
+
+ let id = plugin.id;
+
+ if( typeof id !== 'string' ) {
+ console.warn( 'Unrecognized plugin format; can\'t find plugin.id', plugin );
+ }
+ else if( this.registeredPlugins[id] === undefined ) {
+ this.registeredPlugins[id] = plugin;
+
+ // If a plugin is registered after reveal.js is loaded,
+ // initialize it right away
+ if( this.state === 'loaded' && typeof plugin.init === 'function' ) {
+ plugin.init( this.Reveal );
+ }
+ }
+ 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
+ */
+ hasPlugin( id ) {
+
+ return !!this.registeredPlugins[id];
+
+ }
+
+ /**
+ * Returns the specific plugin instance, if a plugin
+ * with the given ID has been registered.
+ *
+ * @param {String} id Unique plugin identifier
+ */
+ getPlugin( id ) {
+
+ return this.registeredPlugins[id];
+
+ }
+
+ getRegisteredPlugins() {
+
+ return this.registeredPlugins;
+
+ }
+
+}
diff --git a/inst/reveal.js-4.1.2/js/controllers/pointer.js b/inst/reveal.js-4.1.2/js/controllers/pointer.js
new file mode 100644
index 0000000..aec19d5
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/pointer.js
@@ -0,0 +1,118 @@
+/**
+ * Handles hiding of the pointer/cursor when inactive.
+ */
+export default class Pointer {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ // Throttles mouse wheel navigation
+ this.lastMouseWheelStep = 0;
+
+ // Is the mouse pointer currently hidden from view
+ this.cursorHidden = false;
+
+ // Timeout used to determine when the cursor is inactive
+ this.cursorInactiveTimeout = 0;
+
+ this.onDocumentCursorActive = this.onDocumentCursorActive.bind( this );
+ this.onDocumentMouseScroll = this.onDocumentMouseScroll.bind( this );
+
+ }
+
+ /**
+ * Called when the reveal.js config is updated.
+ */
+ configure( config, oldConfig ) {
+
+ if( config.mouseWheel ) {
+ document.addEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF
+ document.addEventListener( 'mousewheel', this.onDocumentMouseScroll, false );
+ }
+ else {
+ document.removeEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF
+ document.removeEventListener( 'mousewheel', this.onDocumentMouseScroll, false );
+ }
+
+ // Auto-hide the mouse pointer when its inactive
+ if( config.hideInactiveCursor ) {
+ document.addEventListener( 'mousemove', this.onDocumentCursorActive, false );
+ document.addEventListener( 'mousedown', this.onDocumentCursorActive, false );
+ }
+ else {
+ this.showCursor();
+
+ document.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );
+ document.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );
+ }
+
+ }
+
+ /**
+ * Shows the mouse pointer after it has been hidden with
+ * #hideCursor.
+ */
+ showCursor() {
+
+ if( this.cursorHidden ) {
+ this.cursorHidden = false;
+ this.Reveal.getRevealElement().style.cursor = '';
+ }
+
+ }
+
+ /**
+ * Hides the mouse pointer when it's on top of the .reveal
+ * container.
+ */
+ hideCursor() {
+
+ if( this.cursorHidden === false ) {
+ this.cursorHidden = true;
+ this.Reveal.getRevealElement().style.cursor = 'none';
+ }
+
+ }
+
+ /**
+ * Called whenever there is mouse input at the document level
+ * to determine if the cursor is active or not.
+ *
+ * @param {object} event
+ */
+ onDocumentCursorActive( event ) {
+
+ this.showCursor();
+
+ clearTimeout( this.cursorInactiveTimeout );
+
+ this.cursorInactiveTimeout = setTimeout( this.hideCursor.bind( this ), this.Reveal.getConfig().hideCursorTime );
+
+ }
+
+ /**
+ * Handles mouse wheel scrolling, throttled to avoid skipping
+ * multiple slides.
+ *
+ * @param {object} event
+ */
+ onDocumentMouseScroll( event ) {
+
+ if( Date.now() - this.lastMouseWheelStep > 1000 ) {
+
+ this.lastMouseWheelStep = Date.now();
+
+ let delta = event.detail || -event.wheelDelta;
+ if( delta > 0 ) {
+ this.Reveal.next();
+ }
+ else if( delta < 0 ) {
+ this.Reveal.prev();
+ }
+
+ }
+
+ }
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/controllers/print.js b/inst/reveal.js-4.1.2/js/controllers/print.js
new file mode 100644
index 0000000..5bedeae
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/print.js
@@ -0,0 +1,212 @@
+import { SLIDES_SELECTOR } from '../utils/constants.js'
+import { queryAll, createStyleSheet } from '../utils/util.js'
+
+/**
+ * Setups up our presentation for printing/exporting to PDF.
+ */
+export default class Print {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ }
+
+ /**
+ * Configures the presentation for printing to a static
+ * PDF.
+ */
+ async setupPDF() {
+
+ const config = this.Reveal.getConfig();
+ const slides = queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR )
+
+ // Compute slide numbers now, before we start duplicating slides
+ const doingSlideNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
+
+ const slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );
+
+ // Dimensions of the PDF pages
+ const pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
+ pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
+
+ // Dimensions of slides within the pages
+ const slideWidth = slideSize.width,
+ slideHeight = slideSize.height;
+
+ await new Promise( requestAnimationFrame );
+
+ // Let the browser know what page size we want to print
+ createStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
+
+ // Limit the size of certain elements to the dimensions of the slide
+ createStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
+
+ document.documentElement.classList.add( 'print-pdf' );
+ document.body.style.width = pageWidth + 'px';
+ document.body.style.height = pageHeight + 'px';
+
+ // Make sure stretch elements fit on slide
+ await new Promise( requestAnimationFrame );
+ this.Reveal.layoutSlideContents( slideWidth, slideHeight );
+
+ // Re-run the slide layout so that r-fit-text is applied based on
+ // the printed slide size
+ slides.forEach( slide => this.Reveal.slideContent.layout( slide ) );
+
+ // Batch scrollHeight access to prevent layout thrashing
+ await new Promise( requestAnimationFrame );
+
+ const slideScrollHeights = slides.map( slide => slide.scrollHeight );
+
+ const pages = [];
+ const pageContainer = slides[0].parentNode;
+
+ // Slide and slide background layout
+ slides.forEach( function( slide, index ) {
+
+ // 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
+ let left = ( pageWidth - slideWidth ) / 2;
+ let top = ( pageHeight - slideHeight ) / 2;
+
+ const contentHeight = slideScrollHeights[ index ];
+ let 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
+ const page = document.createElement( 'div' );
+ pages.push( page );
+
+ page.className = 'pdf-page';
+ page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
+ 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?
+ const notes = this.Reveal.getSlideNotes( slide );
+ if( notes ) {
+
+ const notesSpacing = 8;
+ const notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
+ const 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' ) {
+ pages.push( notesElement );
+ }
+ 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( doingSlideNumbers ) {
+ const slideNumber = index + 1;
+ const numberElement = document.createElement( 'div' );
+ numberElement.classList.add( 'slide-number' );
+ numberElement.classList.add( 'slide-number-pdf' );
+ numberElement.innerHTML = slideNumber;
+ 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.
+ const fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );
+
+ let previousFragmentStep;
+
+ 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' );
+ }, this );
+
+ // Create a separate page for the current fragment state
+ const clonedPage = page.cloneNode( true );
+ pages.push( clonedPage );
+
+ previousFragmentStep = fragments;
+
+ }, this );
+
+ // 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 {
+ queryAll( page, '.fragment:not(.fade-out)' ).forEach( function( fragment ) {
+ fragment.classList.add( 'visible' );
+ } );
+ }
+
+ }
+
+ }, this );
+
+ await new Promise( requestAnimationFrame );
+
+ pages.forEach( page => pageContainer.appendChild( page ) );
+
+ // Notify subscribers that the PDF layout is good to go
+ this.Reveal.dispatchEvent({ type: 'pdf-ready' });
+
+ }
+
+ /**
+ * Checks if this instance is being used to print a PDF.
+ */
+ isPrintingPDF() {
+
+ return ( /print-pdf/gi ).test( window.location.search );
+
+ }
+
+}
diff --git a/inst/reveal.js-4.1.2/js/controllers/progress.js b/inst/reveal.js-4.1.2/js/controllers/progress.js
new file mode 100644
index 0000000..82a370a
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/progress.js
@@ -0,0 +1,105 @@
+/**
+ * Creates a visual progress bar for the presentation.
+ */
+export default class Progress {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ this.onProgressClicked = this.onProgressClicked.bind( this );
+
+ }
+
+ render() {
+
+ this.element = document.createElement( 'div' );
+ this.element.className = 'progress';
+ this.Reveal.getRevealElement().appendChild( this.element );
+
+ this.bar = document.createElement( 'span' );
+ this.element.appendChild( this.bar );
+
+ }
+
+ /**
+ * Called when the reveal.js config is updated.
+ */
+ configure( config, oldConfig ) {
+
+ this.element.style.display = config.progress ? 'block' : 'none';
+
+ }
+
+ bind() {
+
+ if( this.Reveal.getConfig().progress && this.element ) {
+ this.element.addEventListener( 'click', this.onProgressClicked, false );
+ }
+
+ }
+
+ unbind() {
+
+ if ( this.Reveal.getConfig().progress && this.element ) {
+ this.element.removeEventListener( 'click', this.onProgressClicked, false );
+ }
+
+ }
+
+ /**
+ * Updates the progress bar to reflect the current slide.
+ */
+ update() {
+
+ // Update progress if enabled
+ if( this.Reveal.getConfig().progress && this.bar ) {
+
+ let scale = this.Reveal.getProgress();
+
+ // Don't fill the progress bar if there's only one slide
+ if( this.Reveal.getTotalSlides() < 2 ) {
+ scale = 0;
+ }
+
+ this.bar.style.transform = 'scaleX('+ scale +')';
+
+ }
+
+ }
+
+ getMaxWidth() {
+
+ return this.Reveal.getRevealElement().offsetWidth;
+
+ }
+
+ /**
+ * Clicking on the progress bar results in a navigation to the
+ * closest approximate horizontal slide using this equation:
+ *
+ * ( clickX / presentationWidth ) * numberOfSlides
+ *
+ * @param {object} event
+ */
+ onProgressClicked( event ) {
+
+ this.Reveal.onUserInput( event );
+
+ event.preventDefault();
+
+ let slides = this.Reveal.getSlides();
+ let slidesTotal = slides.length;
+ let slideIndex = Math.floor( ( event.clientX / this.getMaxWidth() ) * slidesTotal );
+
+ if( this.Reveal.getConfig().rtl ) {
+ slideIndex = slidesTotal - slideIndex;
+ }
+
+ let targetIndices = this.Reveal.getIndices(slides[slideIndex]);
+ this.Reveal.slide( targetIndices.h, targetIndices.v );
+
+ }
+
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/controllers/slidecontent.js b/inst/reveal.js-4.1.2/js/controllers/slidecontent.js
new file mode 100644
index 0000000..15fe5bd
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/slidecontent.js
@@ -0,0 +1,467 @@
+import { HORIZONTAL_SLIDES_SELECTOR, VERTICAL_SLIDES_SELECTOR } from '../utils/constants.js'
+import { extend, queryAll, closest } from '../utils/util.js'
+import { isMobile } from '../utils/device.js'
+
+import fitty from 'fitty';
+
+/**
+ * Handles loading, unloading and playback of slide
+ * content such as images, videos and iframes.
+ */
+export default class SlideContent {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ this.startEmbeddedIframe = this.startEmbeddedIframe.bind( this );
+
+ }
+
+ /**
+ * Should the given element be preloaded?
+ * Decides based on local element attributes and global config.
+ *
+ * @param {HTMLElement} element
+ */
+ shouldPreload( element ) {
+
+ // Prefer an explicit global preload setting
+ let preload = this.Reveal.getConfig().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
+ */
+ load( slide, options = {} ) {
+
+ // Show the slide element
+ slide.style.display = this.Reveal.getConfig().display;
+
+ // Media elements with data-src attributes
+ queryAll( slide, 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ).forEach( element => {
+ if( element.tagName !== 'IFRAME' || this.shouldPreload( element ) ) {
+ element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
+ element.setAttribute( 'data-lazy-loaded', '' );
+ element.removeAttribute( 'data-src' );
+ }
+ } );
+
+ // Media elements with <source> children
+ queryAll( slide, 'video, audio' ).forEach( media => {
+ let sources = 0;
+
+ queryAll( media, 'source[data-src]' ).forEach( source => {
+ source.setAttribute( 'src', source.getAttribute( 'data-src' ) );
+ source.removeAttribute( 'data-src' );
+ source.setAttribute( 'data-lazy-loaded', '' );
+ sources += 1;
+ } );
+
+ // Enable inline video playback in mobile Safari
+ if( isMobile && media.tagName === 'VIDEO' ) {
+ media.setAttribute( 'playsinline', '' );
+ }
+
+ // 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
+ let background = slide.slideBackgroundElement;
+ if( background ) {
+ background.style.display = 'block';
+
+ let backgroundContent = slide.slideBackgroundContentElement;
+ let backgroundIframe = slide.getAttribute( 'data-background-iframe' );
+
+ // If the background contains media, load it
+ if( background.hasAttribute( 'data-loaded' ) === false ) {
+ background.setAttribute( 'data-loaded', 'true' );
+
+ let 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' );
+
+ // Images
+ if( backgroundImage ) {
+ backgroundContent.style.backgroundImage = backgroundImage.split( ',' ).map( background => {
+ return `url(${encodeURI(background.trim())})`;
+ }).join( ',' );
+ }
+ // Videos
+ else if ( backgroundVideo && !this.Reveal.isSpeakerNotes() ) {
+ let video = document.createElement( 'video' );
+
+ if( backgroundVideoLoop ) {
+ video.setAttribute( 'loop', '' );
+ }
+
+ if( backgroundVideoMuted ) {
+ video.muted = true;
+ }
+
+ // Enable inline playback in mobile Safari
+ //
+ // Mute is required for video to play when using
+ // swipe gestures to navigate since they don't
+ // count as direct user actions :'(
+ if( isMobile ) {
+ video.muted = true;
+ video.setAttribute( 'playsinline', '' );
+ }
+
+ // Support comma separated lists of video sources
+ backgroundVideo.split( ',' ).forEach( source => {
+ video.innerHTML += '<source src="'+ source +'">';
+ } );
+
+ backgroundContent.appendChild( video );
+ }
+ // Iframes
+ else if( backgroundIframe && options.excludeIframes !== true ) {
+ let iframe = document.createElement( 'iframe' );
+ iframe.setAttribute( 'allowfullscreen', '' );
+ iframe.setAttribute( 'mozallowfullscreen', '' );
+ iframe.setAttribute( 'webkitallowfullscreen', '' );
+ iframe.setAttribute( 'allow', 'autoplay' );
+
+ iframe.setAttribute( 'data-src', backgroundIframe );
+
+ iframe.style.width = '100%';
+ iframe.style.height = '100%';
+ iframe.style.maxHeight = '100%';
+ iframe.style.maxWidth = '100%';
+
+ backgroundContent.appendChild( iframe );
+ }
+ }
+
+ // Start loading preloadable iframes
+ let backgroundIframeElement = backgroundContent.querySelector( 'iframe[data-src]' );
+ if( backgroundIframeElement ) {
+
+ // Check if this iframe is eligible to be preloaded
+ if( this.shouldPreload( background ) && !/autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
+ if( backgroundIframeElement.getAttribute( 'src' ) !== backgroundIframe ) {
+ backgroundIframeElement.setAttribute( 'src', backgroundIframe );
+ }
+ }
+
+ }
+
+ }
+
+ this.layout( slide );
+
+ }
+
+ /**
+ * Applies JS-dependent layout helpers for the given slide,
+ * if there are any.
+ */
+ layout( slide ) {
+
+ // Autosize text with the r-fit-text class based on the
+ // size of its container. This needs to happen after the
+ // slide is visible in order to measure the text.
+ Array.from( slide.querySelectorAll( '.r-fit-text' ) ).forEach( element => {
+ fitty( element, {
+ minSize: 24,
+ maxSize: this.Reveal.getConfig().height * 0.8,
+ observeMutations: false,
+ observeWindow: false
+ } );
+ } );
+
+ }
+
+ /**
+ * Unloads and hides the given slide. This is called when the
+ * slide is moved outside of the configured view distance.
+ *
+ * @param {HTMLElement} slide
+ */
+ unload( slide ) {
+
+ // Hide the slide element
+ slide.style.display = 'none';
+
+ // Hide the corresponding background element
+ let background = this.Reveal.getSlideBackground( slide );
+ if( background ) {
+ background.style.display = 'none';
+
+ // Unload any background iframes
+ queryAll( background, 'iframe[src]' ).forEach( element => {
+ element.removeAttribute( 'src' );
+ } );
+ }
+
+ // Reset lazy-loaded media elements with src attributes
+ queryAll( slide, 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ).forEach( element => {
+ element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
+ element.removeAttribute( 'src' );
+ } );
+
+ // Reset lazy-loaded media elements with <source> children
+ queryAll( slide, 'video[data-lazy-loaded] source[src], audio source[src]' ).forEach( source => {
+ source.setAttribute( 'data-src', source.getAttribute( 'src' ) );
+ source.removeAttribute( 'src' );
+ } );
+
+ }
+
+ /**
+ * Enforces origin-specific format rules for embedded media.
+ */
+ formatEmbeddedContent() {
+
+ let _appendParamToIframeSource = ( sourceAttribute, sourceURL, param ) => {
+ queryAll( this.Reveal.getSlidesElement(), 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ).forEach( el => {
+ let 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
+ */
+ startEmbeddedContent( element ) {
+
+ if( element && !this.Reveal.isSpeakerNotes() ) {
+
+ // Restart GIFs
+ queryAll( element, 'img[src$=".gif"]' ).forEach( 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
+ queryAll( element, 'video, audio' ).forEach( el => {
+ if( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {
+ return;
+ }
+
+ // Prefer an explicit global autoplay setting
+ let autoplay = this.Reveal.getConfig().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' ) || !!closest( el, '.slide-background' );
+ }
+
+ if( autoplay && typeof el.play === 'function' ) {
+
+ // If the media is ready, start playback
+ if( el.readyState > 1 ) {
+ this.startEmbeddedMedia( { target: el } );
+ }
+ // Mobile devices never fire a loaded event so instead
+ // of waiting, we initiate playback
+ else if( isMobile ) {
+ let 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( () => {
+ el.controls = true;
+
+ // Once the video does start playing, hide the controls again
+ el.addEventListener( 'play', () => {
+ el.controls = false;
+ } );
+ } );
+ }
+ }
+ // If the media isn't loaded, wait before playing
+ else {
+ el.removeEventListener( 'loadeddata', this.startEmbeddedMedia ); // remove first to avoid dupes
+ el.addEventListener( 'loadeddata', this.startEmbeddedMedia );
+ }
+
+ }
+ } );
+
+ // Normal iframes
+ queryAll( element, 'iframe[src]' ).forEach( el => {
+ if( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {
+ return;
+ }
+
+ this.startEmbeddedIframe( { target: el } );
+ } );
+
+ // Lazy loading iframes
+ queryAll( element, 'iframe[data-src]' ).forEach( el => {
+ if( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {
+ return;
+ }
+
+ if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {
+ el.removeEventListener( 'load', this.startEmbeddedIframe ); // remove first to avoid dupes
+ el.addEventListener( 'load', this.startEmbeddedIframe );
+ el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
+ }
+ } );
+
+ }
+
+ }
+
+ /**
+ * Starts playing an embedded video/audio element after
+ * it has finished loading.
+ *
+ * @param {object} event
+ */
+ startEmbeddedMedia( event ) {
+
+ let isAttachedToDOM = !!closest( event.target, 'html' ),
+ isVisible = !!closest( event.target, '.present' );
+
+ if( isAttachedToDOM && isVisible ) {
+ event.target.currentTime = 0;
+ event.target.play();
+ }
+
+ event.target.removeEventListener( 'loadeddata', this.startEmbeddedMedia );
+
+ }
+
+ /**
+ * "Starts" the content of an embedded iframe using the
+ * postMessage API.
+ *
+ * @param {object} event
+ */
+ startEmbeddedIframe( event ) {
+
+ let iframe = event.target;
+
+ if( iframe && iframe.contentWindow ) {
+
+ let isAttachedToDOM = !!closest( event.target, 'html' ),
+ isVisible = !!closest( event.target, '.present' );
+
+ if( isAttachedToDOM && isVisible ) {
+
+ // Prefer an explicit global autoplay setting
+ let autoplay = this.Reveal.getConfig().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' ) || !!closest( 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
+ */
+ stopEmbeddedContent( element, options = {} ) {
+
+ options = extend( {
+ // Defaults
+ unloadIframes: true
+ }, options );
+
+ if( element && element.parentNode ) {
+ // HTML5 media elements
+ queryAll( element, 'video, audio' ).forEach( 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
+ queryAll( element, 'iframe' ).forEach( el => {
+ if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );
+ el.removeEventListener( 'load', this.startEmbeddedIframe );
+ });
+
+ // YouTube postMessage API
+ queryAll( element, 'iframe[src*="youtube.com/embed/"]' ).forEach( el => {
+ if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {
+ el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
+ }
+ });
+
+ // Vimeo postMessage API
+ queryAll( element, 'iframe[src*="player.vimeo.com/"]' ).forEach( 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
+ queryAll( element, 'iframe[data-src]' ).forEach( 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' );
+ } );
+ }
+ }
+
+ }
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/controllers/slidenumber.js b/inst/reveal.js-4.1.2/js/controllers/slidenumber.js
new file mode 100644
index 0000000..ba124c0
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/slidenumber.js
@@ -0,0 +1,126 @@
+/**
+ * Handles the display of reveal.js' optional slide number.
+ */
+export default class SlideNumber {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ }
+
+ render() {
+
+ this.element = document.createElement( 'div' );
+ this.element.className = 'slide-number';
+ this.Reveal.getRevealElement().appendChild( this.element );
+
+ }
+
+ /**
+ * Called when the reveal.js config is updated.
+ */
+ configure( config, oldConfig ) {
+
+ let slideNumberDisplay = 'none';
+ if( config.slideNumber && !this.Reveal.isPrintingPDF() ) {
+ if( config.showSlideNumber === 'all' ) {
+ slideNumberDisplay = 'block';
+ }
+ else if( config.showSlideNumber === 'speaker' && this.Reveal.isSpeakerNotes() ) {
+ slideNumberDisplay = 'block';
+ }
+ }
+
+ this.element.style.display = slideNumberDisplay;
+
+ }
+
+ /**
+ * Updates the slide number to match the current slide.
+ */
+ update() {
+
+ // Update slide number if enabled
+ if( this.Reveal.getConfig().slideNumber && this.element ) {
+ this.element.innerHTML = this.getSlideNumber();
+ }
+
+ }
+
+ /**
+ * Returns the HTML string corresponding to the current slide
+ * number, including formatting.
+ */
+ getSlideNumber( slide = this.Reveal.getCurrentSlide() ) {
+
+ let config = this.Reveal.getConfig();
+ let value;
+ let format = 'h.v';
+
+ if ( typeof config.slideNumber === 'function' ) {
+ value = config.slideNumber( slide );
+ } 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 ) && this.Reveal.getHorizontalSlides().length === 1 ) {
+ format = 'c';
+ }
+
+ // Offset the current slide number by 1 to make it 1-indexed
+ let horizontalOffset = slide && slide.dataset.visibility === 'uncounted' ? 0 : 1;
+
+ value = [];
+ switch( format ) {
+ case 'c':
+ value.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset );
+ break;
+ case 'c/t':
+ value.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset, '/', this.Reveal.getTotalSlides() );
+ break;
+ default:
+ let indices = this.Reveal.getIndices( slide );
+ value.push( indices.h + horizontalOffset );
+ let sep = format === 'h/v' ? '/' : '.';
+ if( this.Reveal.isVerticalSlide( slide ) ) value.push( sep, indices.v + 1 );
+ }
+ }
+
+ let url = '#' + this.Reveal.location.getHash( slide );
+ return this.formatNumber( value[0], value[1], value[2], url );
+
+ }
+
+ /**
+ * 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
+ * @param {HTMLElement} [url='#'+locationHash()] The url to link to
+ * @return {string} HTML string fragment
+ */
+ formatNumber( a, delimiter, b, url = '#' + this.Reveal.location.getHash() ) {
+
+ 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>`;
+ }
+
+ }
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/controllers/touch.js b/inst/reveal.js-4.1.2/js/controllers/touch.js
new file mode 100644
index 0000000..5ac6a10
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/controllers/touch.js
@@ -0,0 +1,263 @@
+import { isAndroid } from '../utils/device.js'
+import { matches } from '../utils/util.js'
+
+const SWIPE_THRESHOLD = 40;
+
+/**
+ * Controls all touch interactions and navigations for
+ * a presentation.
+ */
+export default class Touch {
+
+ constructor( Reveal ) {
+
+ this.Reveal = Reveal;
+
+ // Holds information about the currently ongoing touch interaction
+ this.touchStartX = 0;
+ this.touchStartY = 0;
+ this.touchStartCount = 0;
+ this.touchCaptured = false;
+
+ this.onPointerDown = this.onPointerDown.bind( this );
+ this.onPointerMove = this.onPointerMove.bind( this );
+ this.onPointerUp = this.onPointerUp.bind( this );
+ this.onTouchStart = this.onTouchStart.bind( this );
+ this.onTouchMove = this.onTouchMove.bind( this );
+ this.onTouchEnd = this.onTouchEnd.bind( this );
+
+ }
+
+ /**
+ *
+ */
+ bind() {
+
+ let revealElement = this.Reveal.getRevealElement();
+
+ if( 'onpointerdown' in window ) {
+ // Use W3C pointer events
+ revealElement.addEventListener( 'pointerdown', this.onPointerDown, false );
+ revealElement.addEventListener( 'pointermove', this.onPointerMove, false );
+ revealElement.addEventListener( 'pointerup', this.onPointerUp, false );
+ }
+ else if( window.navigator.msPointerEnabled ) {
+ // IE 10 uses prefixed version of pointer events
+ revealElement.addEventListener( 'MSPointerDown', this.onPointerDown, false );
+ revealElement.addEventListener( 'MSPointerMove', this.onPointerMove, false );
+ revealElement.addEventListener( 'MSPointerUp', this.onPointerUp, false );
+ }
+ else {
+ // Fall back to touch events
+ revealElement.addEventListener( 'touchstart', this.onTouchStart, false );
+ revealElement.addEventListener( 'touchmove', this.onTouchMove, false );
+ revealElement.addEventListener( 'touchend', this.onTouchEnd, false );
+ }
+
+ }
+
+ /**
+ *
+ */
+ unbind() {
+
+ let revealElement = this.Reveal.getRevealElement();
+
+ revealElement.removeEventListener( 'pointerdown', this.onPointerDown, false );
+ revealElement.removeEventListener( 'pointermove', this.onPointerMove, false );
+ revealElement.removeEventListener( 'pointerup', this.onPointerUp, false );
+
+ revealElement.removeEventListener( 'MSPointerDown', this.onPointerDown, false );
+ revealElement.removeEventListener( 'MSPointerMove', this.onPointerMove, false );
+ revealElement.removeEventListener( 'MSPointerUp', this.onPointerUp, false );
+
+ revealElement.removeEventListener( 'touchstart', this.onTouchStart, false );
+ revealElement.removeEventListener( 'touchmove', this.onTouchMove, false );
+ revealElement.removeEventListener( 'touchend', this.onTouchEnd, false );
+
+ }
+
+ /**
+ * Checks if the target element prevents the triggering of
+ * swipe navigation.
+ */
+ isSwipePrevented( target ) {
+
+ // Prevent accidental swipes when scrubbing timelines
+ if( matches( target, 'video, audio' ) ) return true;
+
+ while( target && typeof target.hasAttribute === 'function' ) {
+ if( target.hasAttribute( 'data-prevent-swipe' ) ) return true;
+ target = target.parentNode;
+ }
+
+ return false;
+
+ }
+
+ /**
+ * Handler for the 'touchstart' event, enables support for
+ * swipe and pinch gestures.
+ *
+ * @param {object} event
+ */
+ onTouchStart( event ) {
+
+ if( this.isSwipePrevented( event.target ) ) return true;
+
+ this.touchStartX = event.touches[0].clientX;
+ this.touchStartY = event.touches[0].clientY;
+ this.touchStartCount = event.touches.length;
+
+ }
+
+ /**
+ * Handler for the 'touchmove' event.
+ *
+ * @param {object} event
+ */
+ onTouchMove( event ) {
+
+ if( this.isSwipePrevented( event.target ) ) return true;
+
+ let config = this.Reveal.getConfig();
+
+ // Each touch should only trigger one action
+ if( !this.touchCaptured ) {
+ this.Reveal.onUserInput( event );
+
+ let currentX = event.touches[0].clientX;
+ let currentY = event.touches[0].clientY;
+
+ // There was only one touch point, look for a swipe
+ if( event.touches.length === 1 && this.touchStartCount !== 2 ) {
+
+ let availableRoutes = this.Reveal.availableRoutes({ includeFragments: true });
+
+ let deltaX = currentX - this.touchStartX,
+ deltaY = currentY - this.touchStartY;
+
+ if( deltaX > SWIPE_THRESHOLD && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
+ this.touchCaptured = true;
+ if( config.navigationMode === 'linear' ) {
+ if( config.rtl ) {
+ this.Reveal.next();
+ }
+ else {
+ this.Reveal.prev();
+ }
+ }
+ else {
+ this.Reveal.left();
+ }
+ }
+ else if( deltaX < -SWIPE_THRESHOLD && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
+ this.touchCaptured = true;
+ if( config.navigationMode === 'linear' ) {
+ if( config.rtl ) {
+ this.Reveal.prev();
+ }
+ else {
+ this.Reveal.next();
+ }
+ }
+ else {
+ this.Reveal.right();
+ }
+ }
+ else if( deltaY > SWIPE_THRESHOLD && availableRoutes.up ) {
+ this.touchCaptured = true;
+ if( config.navigationMode === 'linear' ) {
+ this.Reveal.prev();
+ }
+ else {
+ this.Reveal.up();
+ }
+ }
+ else if( deltaY < -SWIPE_THRESHOLD && availableRoutes.down ) {
+ this.touchCaptured = true;
+ if( config.navigationMode === 'linear' ) {
+ this.Reveal.next();
+ }
+ else {
+ this.Reveal.down();
+ }
+ }
+
+ // If we're embedded, only block touch events if they have
+ // triggered an action
+ if( config.embedded ) {
+ if( this.touchCaptured || this.Reveal.isVerticalSlide() ) {
+ 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( isAndroid ) {
+ event.preventDefault();
+ }
+
+ }
+
+ /**
+ * Handler for the 'touchend' event.
+ *
+ * @param {object} event
+ */
+ onTouchEnd( event ) {
+
+ this.touchCaptured = false;
+
+ }
+
+ /**
+ * Convert pointer down to touch start.
+ *
+ * @param {object} event
+ */
+ onPointerDown( event ) {
+
+ if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
+ event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
+ this.onTouchStart( event );
+ }
+
+ }
+
+ /**
+ * Convert pointer move to touch move.
+ *
+ * @param {object} event
+ */
+ onPointerMove( event ) {
+
+ if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
+ event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
+ this.onTouchMove( event );
+ }
+
+ }
+
+ /**
+ * Convert pointer up to touch end.
+ *
+ * @param {object} event
+ */
+ onPointerUp( event ) {
+
+ if( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === "touch" ) {
+ event.touches = [{ clientX: event.clientX, clientY: event.clientY }];
+ this.onTouchEnd( event );
+ }
+
+ }
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/index.js b/inst/reveal.js-4.1.2/js/index.js
new file mode 100644
index 0000000..57be501
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/index.js
@@ -0,0 +1,58 @@
+import Deck, { VERSION } from './reveal.js'
+
+/**
+ * Expose the Reveal class to the window. To create a
+ * new instance:
+ * let deck = new Reveal( document.querySelector( '.reveal' ), {
+ * controls: false
+ * } );
+ * deck.initialize().then(() => {
+ * // reveal.js is ready
+ * });
+ */
+let Reveal = Deck;
+
+
+/**
+ * The below is a thin shell that mimics the pre 4.0
+ * reveal.js API and ensures backwards compatibility.
+ * This API only allows for one Reveal instance per
+ * page, whereas the new API above lets you run many
+ * presentations on the same page.
+ *
+ * Reveal.initialize( { controls: false } ).then(() => {
+ * // reveal.js is ready
+ * });
+ */
+
+let enqueuedAPICalls = [];
+
+Reveal.initialize = options => {
+
+ // Create our singleton reveal.js instance
+ Object.assign( Reveal, new Deck( document.querySelector( '.reveal' ), options ) );
+
+ // Invoke any enqueued API calls
+ enqueuedAPICalls.map( method => method( Reveal ) );
+
+ return Reveal.initialize();
+
+}
+
+/**
+ * The pre 4.0 API let you add event listener before
+ * initializing. We maintain the same behavior by
+ * queuing up premature API calls and invoking all
+ * of them when Reveal.initialize is called.
+ */
+[ 'configure', 'on', 'off', 'addEventListener', 'removeEventListener', 'registerPlugin' ].forEach( method => {
+ Reveal[method] = ( ...args ) => {
+ enqueuedAPICalls.push( deck => deck[method].call( null, ...args ) );
+ }
+} );
+
+Reveal.isReady = () => false;
+
+Reveal.VERSION = VERSION;
+
+export default Reveal;
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/reveal.js b/inst/reveal.js-4.1.2/js/reveal.js
new file mode 100644
index 0000000..c325272
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/reveal.js
@@ -0,0 +1,2635 @@
+import SlideContent from './controllers/slidecontent.js'
+import SlideNumber from './controllers/slidenumber.js'
+import Backgrounds from './controllers/backgrounds.js'
+import AutoAnimate from './controllers/autoanimate.js'
+import Fragments from './controllers/fragments.js'
+import Overview from './controllers/overview.js'
+import Keyboard from './controllers/keyboard.js'
+import Location from './controllers/location.js'
+import Controls from './controllers/controls.js'
+import Progress from './controllers/progress.js'
+import Pointer from './controllers/pointer.js'
+import Plugins from './controllers/plugins.js'
+import Print from './controllers/print.js'
+import Touch from './controllers/touch.js'
+import Focus from './controllers/focus.js'
+import Notes from './controllers/notes.js'
+import Playback from './components/playback.js'
+import defaultConfig from './config.js'
+import * as Util from './utils/util.js'
+import * as Device from './utils/device.js'
+import {
+ SLIDES_SELECTOR,
+ HORIZONTAL_SLIDES_SELECTOR,
+ VERTICAL_SLIDES_SELECTOR,
+ POST_MESSAGE_METHOD_BLACKLIST
+} from './utils/constants.js'
+
+// The reveal.js version
+export const VERSION = '4.1.2';
+
+/**
+ * reveal.js
+ * https://revealjs.com
+ * MIT licensed
+ *
+ * Copyright (C) 2020 Hakim El Hattab, https://hakim.se
+ */
+export default function( revealElement, options ) {
+
+ // Support initialization with no args, one arg
+ // [options] or two args [revealElement, options]
+ if( arguments.length < 2 ) {
+ options = arguments[0];
+ revealElement = document.querySelector( '.reveal' );
+ }
+
+ const Reveal = {};
+
+ // Configuration defaults, can be overridden at initialization time
+ let config = {},
+
+ // Flags if reveal.js is loaded (has dispatched the 'ready' event)
+ ready = false,
+
+ // The horizontal and vertical index of the currently active slide
+ indexh,
+ indexv,
+
+ // The previous and current slide HTML elements
+ previousSlide,
+ currentSlide,
+
+ // Remember which directions that the user has navigated towards
+ navigationHistory = {
+ hasNavigatedHorizontally: false,
+ hasNavigatedVertically: false
+ },
+
+ // Slides may have 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 = {},
+
+ // Flags if the interaction event listeners are bound
+ eventsAreBound = false,
+
+ // The current slide transition state; idle or running
+ transition = 'idle',
+
+ // The current auto-slide duration
+ autoSlide = 0,
+
+ // Auto slide properties
+ autoSlidePlayer,
+ autoSlideTimeout = 0,
+ autoSlideStartTime = -1,
+ autoSlidePaused = false,
+
+ // Controllers for different aspects of our presentation. They're
+ // all given direct references to this Reveal instance since there
+ // may be multiple presentations running in parallel.
+ slideContent = new SlideContent( Reveal ),
+ slideNumber = new SlideNumber( Reveal ),
+ autoAnimate = new AutoAnimate( Reveal ),
+ backgrounds = new Backgrounds( Reveal ),
+ fragments = new Fragments( Reveal ),
+ overview = new Overview( Reveal ),
+ keyboard = new Keyboard( Reveal ),
+ location = new Location( Reveal ),
+ controls = new Controls( Reveal ),
+ progress = new Progress( Reveal ),
+ pointer = new Pointer( Reveal ),
+ plugins = new Plugins( Reveal ),
+ print = new Print( Reveal ),
+ focus = new Focus( Reveal ),
+ touch = new Touch( Reveal ),
+ notes = new Notes( Reveal );
+
+ /**
+ * Starts up the presentation.
+ */
+ function initialize( initOptions ) {
+
+ // Cache references to key DOM elements
+ dom.wrapper = revealElement;
+ dom.slides = revealElement.querySelector( '.slides' );
+
+ // Compose our config object in order of increasing precedence:
+ // 1. Default reveal.js options
+ // 2. Options provided via Reveal.configure() prior to
+ // initialization
+ // 3. Options passed to the Reveal constructor
+ // 4. Options passed to Reveal.initialize
+ // 5. Query params
+ config = { ...defaultConfig, ...config, ...options, ...initOptions, ...Util.getQueryHash() };
+
+ setViewport();
+
+ // Force a layout when the whole page, incl fonts, has loaded
+ window.addEventListener( 'load', layout, false );
+
+ // Register plugins and load dependencies, then move on to #start()
+ plugins.load( config.plugins, config.dependencies ).then( start );
+
+ return new Promise( resolve => Reveal.on( 'ready', resolve ) );
+
+ }
+
+ /**
+ * Encase the presentation in a reveal.js viewport. The
+ * extent of the viewport differs based on configuration.
+ */
+ function setViewport() {
+
+ // Embedded decks use the reveal element as their viewport
+ if( config.embedded === true ) {
+ dom.viewport = Util.closest( revealElement, '.reveal-viewport' ) || revealElement;
+ }
+ // Full-page decks use the body as their viewport
+ else {
+ dom.viewport = document.body;
+ document.documentElement.classList.add( 'reveal-full-page' );
+ }
+
+ dom.viewport.classList.add( 'reveal-viewport' );
+
+ }
+
+ /**
+ * Starts up reveal.js by binding input events and navigating
+ * to the current URL deeplink if there is one.
+ */
+ function start() {
+
+ ready = true;
+
+ // Remove slides hidden with data-visibility
+ removeHiddenSlides();
+
+ // 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
+ location.readURL();
+
+ // Create slide backgrounds
+ backgrounds.update( true );
+
+ // Notify listeners that the presentation is ready but use a 1ms
+ // timeout to ensure it's not fired synchronously after #initialize()
+ setTimeout( () => {
+ // Enable transitions now that we're loaded
+ dom.slides.classList.remove( 'no-transition' );
+
+ dom.wrapper.classList.add( 'ready' );
+
+ dispatchEvent({
+ type: 'ready',
+ data: {
+ indexh,
+ indexv,
+ currentSlide
+ }
+ });
+ }, 1 );
+
+ // Special setup and config is required when printing to PDF
+ if( print.isPrintingPDF() ) {
+ removeEventListeners();
+
+ // The document needs to have loaded for the PDF layout
+ // measurements to be accurate
+ if( document.readyState === 'complete' ) {
+ print.setupPDF();
+ }
+ else {
+ window.addEventListener( 'load', () => {
+ print.setupPDF();
+ } );
+ }
+ }
+
+ }
+
+ /**
+ * Removes all slides with data-visibility="hidden". This
+ * is done right before the rest of the presentation is
+ * initialized.
+ *
+ * If you want to show all hidden slides, initialize
+ * reveal.js with showHiddenSlides set to true.
+ */
+ function removeHiddenSlides() {
+
+ if( !config.showHiddenSlides ) {
+ Util.queryAll( dom.wrapper, 'section[data-visibility="hidden"]' ).forEach( slide => {
+ slide.parentNode.removeChild( slide );
+ } );
+ }
+
+ }
+
+ /**
+ * 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( Device.isMobile ) {
+ dom.wrapper.classList.add( 'no-hover' );
+ }
+ else {
+ dom.wrapper.classList.remove( 'no-hover' );
+ }
+
+ backgrounds.render();
+ slideNumber.render();
+ controls.render();
+ progress.render();
+ notes.render();
+
+ // Overlay graphic which is displayed during the paused mode
+ dom.pauseOverlay = Util.createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class="resume-button">Resume presentation</button>' : null );
+
+ dom.statusElement = createStatusElement();
+
+ dom.wrapper.setAttribute( 'role', 'application' );
+ }
+
+ /**
+ * 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 createStatusElement() {
+
+ let statusElement = dom.wrapper.querySelector( '.aria-status' );
+ if( !statusElement ) {
+ statusElement = document.createElement( 'div' );
+ statusElement.style.position = 'absolute';
+ statusElement.style.height = '1px';
+ statusElement.style.width = '1px';
+ statusElement.style.overflow = 'hidden';
+ statusElement.style.clip = 'rect( 1px, 1px, 1px, 1px )';
+ statusElement.classList.add( 'aria-status' );
+ statusElement.setAttribute( 'aria-live', 'polite' );
+ statusElement.setAttribute( 'aria-atomic','true' );
+ dom.wrapper.appendChild( statusElement );
+ }
+ return statusElement;
+
+ }
+
+ /**
+ * Announces the given text to screen readers.
+ */
+ function announceStatus( value ) {
+
+ dom.statusElement.textContent = value;
+
+ }
+
+ /**
+ * 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 ) {
+
+ let text = '';
+
+ // Text node
+ if( node.nodeType === 3 ) {
+ text += node.textContent;
+ }
+ // Element node
+ else if( node.nodeType === 1 ) {
+
+ let isAriaHidden = node.getAttribute( 'aria-hidden' );
+ let isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';
+ if( isAriaHidden !== 'true' && !isDisplayHidden ) {
+
+ Array.from( node.childNodes ).forEach( child => {
+ text += getStatusText( child );
+ } );
+
+ }
+
+ }
+
+ text = text.trim();
+
+ return text === '' ? '' : text + ' ';
+
+ }
+
+ /**
+ * 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( () => {
+ if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {
+ dom.wrapper.scrollTop = 0;
+ dom.wrapper.scrollLeft = 0;
+ }
+ }, 1000 );
+
+ }
+
+ /**
+ * 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', event => {
+ let 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' ) {
+
+ if( POST_MESSAGE_METHOD_BLACKLIST.test( data.method ) === false ) {
+
+ const result = Reveal[data.method].apply( Reveal, data.args );
+
+ // Dispatch a postMessage event with the returned value from
+ // our method invocation for getter functions
+ dispatchPostMessage( 'callback', { method: data.method, result: result } );
+
+ }
+ else {
+ console.warn( 'reveal.js: "'+ data.method +'" is is blacklisted from the postMessage API' );
+ }
+
+ }
+ }
+ }, false );
+ }
+
+ }
+
+ /**
+ * Applies the configuration settings from the config
+ * object. May be called multiple times.
+ *
+ * @param {object} options
+ */
+ function configure( options ) {
+
+ const oldConfig = { ...config }
+
+ // New config options may be passed when this method
+ // is invoked through the API after initialization
+ if( typeof options === 'object' ) Util.extend( config, options );
+
+ // Abort if reveal.js hasn't finished loading, config
+ // changes will be applied automatically once ready
+ if( Reveal.isReady() === false ) return;
+
+ const numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;
+
+ // The transition is added as a class on the .reveal element
+ dom.wrapper.classList.remove( oldConfig.transition );
+ dom.wrapper.classList.add( config.transition );
+
+ dom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );
+ dom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );
+
+ // Expose our configured slide dimensions as custom props
+ dom.viewport.style.setProperty( '--slide-width', config.width + 'px' );
+ dom.viewport.style.setProperty( '--slide-height', config.height + 'px' );
+
+ if( config.shuffle ) {
+ shuffle();
+ }
+
+ Util.toggleClass( dom.wrapper, 'embedded', config.embedded );
+ Util.toggleClass( dom.wrapper, 'rtl', config.rtl );
+ Util.toggleClass( dom.wrapper, 'center', config.center );
+
+ // Exit the paused mode if it was configured off
+ if( config.pause === false ) {
+ resume();
+ }
+
+ // Iframe link previews
+ if( config.previewLinks ) {
+ enablePreviewLinks();
+ disablePreviewLinks( '[data-preview-link=false]' );
+ }
+ else {
+ disablePreviewLinks();
+ enablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );
+ }
+
+ // Reset all changes made by auto-animations
+ autoAnimate.reset();
+
+ // Remove existing auto-slide controls
+ if( autoSlidePlayer ) {
+ autoSlidePlayer.destroy();
+ autoSlidePlayer = null;
+ }
+
+ // Generate auto-slide controls if needed
+ if( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable ) {
+ autoSlidePlayer = new Playback( dom.wrapper, () => {
+ return Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );
+ } );
+
+ autoSlidePlayer.on( 'click', onAutoSlidePlayerClick );
+ autoSlidePaused = false;
+ }
+
+ // 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' );
+ }
+
+ notes.configure( config, oldConfig );
+ focus.configure( config, oldConfig );
+ pointer.configure( config, oldConfig );
+ controls.configure( config, oldConfig );
+ progress.configure( config, oldConfig );
+ keyboard.configure( config, oldConfig );
+ fragments.configure( config, oldConfig );
+ slideNumber.configure( config, oldConfig );
+
+ sync();
+
+ }
+
+ /**
+ * Binds all event listeners.
+ */
+ function addEventListeners() {
+
+ eventsAreBound = true;
+
+ window.addEventListener( 'resize', onWindowResize, false );
+
+ if( config.touch ) touch.bind();
+ if( config.keyboard ) keyboard.bind();
+ if( config.progress ) progress.bind();
+ if( config.respondToHashChanges ) location.bind();
+ controls.bind();
+ focus.bind();
+
+ dom.slides.addEventListener( 'transitionend', onTransitionEnd, false );
+ dom.pauseOverlay.addEventListener( 'click', resume, false );
+
+ if( config.focusBodyOnPageVisibilityChange ) {
+ document.addEventListener( 'visibilitychange', onPageVisibilityChange, false );
+ }
+
+ }
+
+ /**
+ * Unbinds all event listeners.
+ */
+ function removeEventListeners() {
+
+ eventsAreBound = false;
+
+ touch.unbind();
+ focus.unbind();
+ keyboard.unbind();
+ controls.unbind();
+ progress.unbind();
+ location.unbind();
+
+ window.removeEventListener( 'resize', onWindowResize, false );
+
+ dom.slides.removeEventListener( 'transitionend', onTransitionEnd, false );
+ dom.pauseOverlay.removeEventListener( 'click', resume, false );
+
+ }
+
+ /**
+ * Adds a listener to one of our custom reveal.js events,
+ * like slidechanged.
+ */
+ function on( type, listener, useCapture ) {
+
+ revealElement.addEventListener( type, listener, useCapture );
+
+ }
+
+ /**
+ * Unsubscribes from a reveal.js event.
+ */
+ function off( type, listener, useCapture ) {
+
+ revealElement.removeEventListener( type, listener, useCapture );
+
+ }
+
+ /**
+ * 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 ) {
+ Util.transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );
+ }
+ else {
+ Util.transformElement( dom.slides, slidesTransform.overview );
+ }
+
+ }
+
+ /**
+ * Dispatches an event of the specified type from the
+ * reveal DOM element.
+ */
+ function dispatchEvent({ target=dom.wrapper, type, data, bubbles=true }) {
+
+ let event = document.createEvent( 'HTMLEvents', 1, 2 );
+ event.initEvent( type, bubbles, true );
+ Util.extend( event, data );
+ target.dispatchEvent( event );
+
+ if( target === dom.wrapper ) {
+ // If we're in an iframe, post each reveal.js event to the
+ // parent window. Used by the notes plugin
+ dispatchPostMessage( type );
+ }
+
+ }
+
+ /**
+ * Dispatched a postMessage of the given type from our window.
+ */
+ function dispatchPostMessage( type, data ) {
+
+ if( config.postMessageEvents && window.parent !== window.self ) {
+ let message = {
+ namespace: 'reveal',
+ eventName: type,
+ state: getState()
+ };
+
+ Util.extend( message, data );
+
+ window.parent.postMessage( JSON.stringify( message ), '*' );
+ }
+
+ }
+
+ /**
+ * Bind preview frame links.
+ *
+ * @param {string} [selector=a] - selector for anchors
+ */
+ function enablePreviewLinks( selector = 'a' ) {
+
+ Array.from( dom.wrapper.querySelectorAll( selector ) ).forEach( element => {
+ if( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {
+ element.addEventListener( 'click', onPreviewLinkClicked, false );
+ }
+ } );
+
+ }
+
+ /**
+ * Unbind preview frame links.
+ */
+ function disablePreviewLinks( selector = 'a' ) {
+
+ Array.from( dom.wrapper.querySelectorAll( selector ) ).forEach( 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>`;
+
+ dom.overlay.querySelector( 'iframe' ).addEventListener( 'load', event => {
+ dom.overlay.classList.add( 'loaded' );
+ }, false );
+
+ dom.overlay.querySelector( '.close' ).addEventListener( 'click', event => {
+ closeOverlay();
+ event.preventDefault();
+ }, false );
+
+ dom.overlay.querySelector( '.external' ).addEventListener( 'click', event => {
+ closeOverlay();
+ }, false );
+
+ }
+
+ /**
+ * 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 );
+
+ let html = '<p class="title">Keyboard Shortcuts</p><br/>';
+
+ let shortcuts = keyboard.getShortcuts(),
+ bindings = keyboard.getBindings();
+
+ html += '<table><th>KEY</th><th>ACTION</th>';
+ for( let key in shortcuts ) {
+ html += `<tr><td>${key}</td><td>${shortcuts[ key ]}</td></tr>`;
+ }
+
+ // Add custom key bindings that have associated descriptions
+ for( let binding in bindings ) {
+ if( bindings[binding].key && bindings[binding].description ) {
+ html += `<tr><td>${bindings[binding].key}</td><td>${bindings[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>
+ `;
+
+ dom.overlay.querySelector( '.close' ).addEventListener( 'click', event => {
+ closeOverlay();
+ event.preventDefault();
+ }, false );
+
+ }
+
+ }
+
+ /**
+ * Closes any currently open overlay.
+ */
+ function closeOverlay() {
+
+ if( dom.overlay ) {
+ dom.overlay.parentNode.removeChild( dom.overlay );
+ dom.overlay = null;
+ return true;
+ }
+
+ return false;
+
+ }
+
+ /**
+ * Applies JavaScript-controlled layout rules to the
+ * presentation.
+ */
+ function layout() {
+
+ if( dom.wrapper && !print.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( Device.isMobile && !config.embedded ) {
+ document.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );
+ }
+
+ const size = getComputedSlideSize();
+
+ const 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 {
+ // Zoom Scaling
+ // Content remains crisp no matter how much we scale. Side
+ // effects are minor differences in text layout and iframe
+ // viewports changing size. A 200x200 iframe viewport in a
+ // 2x zoomed presentation ends up having a 400x400 viewport.
+ if( scale > 1 && Device.supportsZoom && window.devicePixelRatio < 2 ) {
+ dom.slides.style.zoom = scale;
+ dom.slides.style.left = '';
+ dom.slides.style.top = '';
+ dom.slides.style.bottom = '';
+ dom.slides.style.right = '';
+ transformSlides( { layout: '' } );
+ }
+ // Transform Scaling
+ // Content layout remains the exact same when scaled up.
+ // Side effect is content becoming blurred, especially with
+ // high scale values on ldpi screens.
+ 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
+ const slides = Array.from( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );
+
+ for( let i = 0, len = slides.length; i < len; i++ ) {
+ const 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({
+ type: 'resize',
+ data: {
+ oldScale,
+ scale,
+ size
+ }
+ });
+ }
+ }
+
+ progress.update();
+ backgrounds.updateParallax();
+
+ if( overview.isActive() ) {
+ overview.update();
+ }
+
+ }
+
+ }
+
+ /**
+ * 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 'r-stretch' class
+ Util.queryAll( dom.slides, 'section > .stretch, section > .r-stretch' ).forEach( element => {
+
+ // Determine how much vertical space we can use
+ let remainingHeight = Util.getRemainingHeight( element, height );
+
+ // Consider the aspect ratio of media elements
+ if( /(img|video)/gi.test( element.nodeName ) ) {
+ const nw = element.naturalWidth || element.videoWidth,
+ nh = element.naturalHeight || element.videoHeight;
+
+ const 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 ) {
+
+ const 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
+ const attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';
+
+ return parseInt( stack.getAttribute( attributeName ) || 0, 10 );
+ }
+
+ return 0;
+
+ }
+
+ /**
+ * 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 = currentSlide ) {
+
+ return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
+
+ }
+
+ /**
+ * Returns true if we're on the last slide in the current
+ * vertical stack.
+ */
+ function isLastVerticalSlide() {
+
+ if( currentSlide && isVerticalSlide( currentSlide ) ) {
+ // Does this slide have a next sibling?
+ if( currentSlide.nextElementSibling ) return false;
+
+ return true;
+ }
+
+ return false;
+
+ }
+
+ /**
+ * Returns true if we're currently on the first slide in
+ * the presentation.
+ */
+ function isFirstSlide() {
+
+ return indexh === 0 && indexv === 0;
+
+ }
+
+ /**
+ * Returns true if we're currently on the last slide in
+ * the presenation. If the last slide is a stack, we only
+ * consider this the last slide if it's at the end of the
+ * stack.
+ */
+ function isLastSlide() {
+
+ 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;
+
+ }
+
+ /**
+ * Enters the paused mode which fades everything on screen to
+ * black.
+ */
+ function pause() {
+
+ if( config.pause ) {
+ const wasPaused = dom.wrapper.classList.contains( 'paused' );
+
+ cancelAutoSlide();
+ dom.wrapper.classList.add( 'paused' );
+
+ if( wasPaused === false ) {
+ dispatchEvent({ type: 'paused' });
+ }
+ }
+
+ }
+
+ /**
+ * Exits from the paused mode.
+ */
+ function resume() {
+
+ const wasPaused = dom.wrapper.classList.contains( 'paused' );
+ dom.wrapper.classList.remove( 'paused' );
+
+ cueAutoSlide();
+
+ if( wasPaused ) {
+ dispatchEvent({ type: '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
+ const 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 && !overview.isActive() ) {
+ 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
+ const stateBefore = state.concat();
+
+ // Reset the state array
+ state.length = 0;
+
+ let 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 );
+
+ // Dispatch an event if the slide changed
+ let slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );
+
+ // Ensure that the previous slide is never the same as the current
+ if( !slideChanged ) previousSlide = null;
+
+ // Find the current horizontal slide and any possible vertical slides
+ // within it
+ let currentHorizontalSlide = horizontalSlides[ indexh ],
+ currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );
+
+ // Store references to the previous and current slides
+ currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
+
+ let autoAnimateTransition = false;
+
+ // Detect if we're moving between two auto-animated slides
+ if( slideChanged && previousSlide && currentSlide && !overview.isActive() ) {
+
+ // If this is an auto-animated transition, we disable the
+ // regular slide transition
+ //
+ // Note 20-03-2020:
+ // This needs to happen before we update slide visibility,
+ // otherwise transitions will still run in Safari.
+ if( previousSlide.hasAttribute( 'data-auto-animate' ) && currentSlide.hasAttribute( 'data-auto-animate' )
+ && previousSlide.getAttribute( 'data-auto-animate-id' ) === currentSlide.getAttribute( 'data-auto-animate-id' )
+ && !( ( indexh > indexhBefore || indexv > indexvBefore ) ? currentSlide : previousSlide ).hasAttribute( 'data-auto-animate-restart' ) ) {
+
+ autoAnimateTransition = true;
+ dom.slides.classList.add( 'disable-slide-transitions' );
+ }
+
+ transition = 'running';
+
+ }
+
+ // Update the visibility of slides now that the indices have changed
+ updateSlidesVisibility();
+
+ layout();
+
+ // Update the overview if it's currently active
+ if( overview.isActive() ) {
+ overview.update();
+ }
+
+ // Show fragment, if specified
+ if( typeof f !== 'undefined' ) {
+ fragments.goto( f );
+ }
+
+ // 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
+ if( isFirstSlide() ) {
+ // Launch async task
+ setTimeout( () => {
+ getVerticalStacks().forEach( slide => {
+ setPreviousVerticalIndex( slide, 0 );
+ } );
+ }, 0 );
+ }
+ }
+
+ // Apply the new state
+ stateLoop: for( let 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( let j = 0; j < stateBefore.length; j++ ) {
+ if( stateBefore[j] === state[i] ) {
+ stateBefore.splice( j, 1 );
+ continue stateLoop;
+ }
+ }
+
+ dom.viewport.classList.add( state[i] );
+
+ // Dispatch custom event matching the state's name
+ dispatchEvent({ type: state[i] });
+ }
+
+ // Clean up the remains of the previous state
+ while( stateBefore.length ) {
+ dom.viewport.classList.remove( stateBefore.pop() );
+ }
+
+ if( slideChanged ) {
+ dispatchEvent({
+ type: 'slidechanged',
+ data: {
+ indexh,
+ indexv,
+ previousSlide,
+ currentSlide,
+ origin: o
+ }
+ });
+ }
+
+ // Handle embedded content
+ if( slideChanged || !previousSlide ) {
+ slideContent.stopEmbeddedContent( previousSlide );
+ slideContent.startEmbeddedContent( currentSlide );
+ }
+
+ // Announce the current slide contents to screen readers
+ // Use animation frame to prevent getComputedStyle in getStatusText
+ // from triggering layout mid-frame
+ requestAnimationFrame( () => {
+ announceStatus( getStatusText( currentSlide ) );
+ });
+
+ progress.update();
+ controls.update();
+ notes.update();
+ backgrounds.update();
+ backgrounds.updateParallax();
+ slideNumber.update();
+ fragments.update();
+
+ // Update the URL hash
+ location.writeURL();
+
+ cueAutoSlide();
+
+ // Auto-animation
+ if( autoAnimateTransition ) {
+
+ setTimeout( () => {
+ dom.slides.classList.remove( 'disable-slide-transitions' );
+ }, 0 );
+
+ if( config.autoAnimate ) {
+ // Run the auto-animation between our slides
+ autoAnimate.run( previousSlide, currentSlide );
+ }
+
+ }
+
+ }
+
+ /**
+ * 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 all slide backgrounds
+ backgrounds.create();
+
+ // Write the current hash to the URL
+ location.writeURL();
+
+ fragments.sortAll();
+
+ controls.update();
+ progress.update();
+
+ updateSlidesVisibility();
+
+ notes.update();
+ notes.updateVisibility();
+ backgrounds.update( true );
+ slideNumber.update();
+ slideContent.formatEmbeddedContent();
+
+ // Start or stop embedded content depending on global config
+ if( config.autoPlayMedia === false ) {
+ slideContent.stopEmbeddedContent( currentSlide, { unloadIframes: false } );
+ }
+ else {
+ slideContent.startEmbeddedContent( currentSlide );
+ }
+
+ if( overview.isActive() ) {
+ overview.layout();
+ }
+
+ }
+
+ /**
+ * 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 = currentSlide ) {
+
+ backgrounds.sync( slide );
+ fragments.sync( slide );
+
+ slideContent.load( slide );
+
+ backgrounds.update();
+ notes.update();
+
+ }
+
+ /**
+ * Resets all vertical slides so that only the first
+ * is visible.
+ */
+ function resetVerticalSlides() {
+
+ getHorizontalSlides().forEach( horizontalSlide => {
+
+ Util.queryAll( horizontalSlide, 'section' ).forEach( ( verticalSlide, y ) => {
+
+ if( y > 0 ) {
+ verticalSlide.classList.remove( 'present' );
+ verticalSlide.classList.remove( 'past' );
+ verticalSlide.classList.add( 'future' );
+ verticalSlide.setAttribute( 'aria-hidden', 'true' );
+ }
+
+ } );
+
+ } );
+
+ }
+
+ /**
+ * Randomly shuffles all slides in the deck.
+ */
+ function shuffle( slides = getHorizontalSlides() ) {
+
+ slides.forEach( ( slide, i ) => {
+
+ // Insert the slide next to a randomly picked sibling slide
+ // slide. This may cause the slide to insert before itself,
+ // but that's not an issue.
+ let beforeSlide = slides[ Math.floor( Math.random() * slides.length ) ];
+ if( beforeSlide.parentNode === slide.parentNode ) {
+ slide.parentNode.insertBefore( slide, beforeSlide );
+ }
+
+ // Randomize the order of vertical slides (if there are any)
+ let verticalSlides = slide.querySelectorAll( 'section' );
+ if( verticalSlides.length ) {
+ shuffle( verticalSlides );
+ }
+
+ } );
+
+ }
+
+ /**
+ * 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
+ let slides = Util.queryAll( dom.wrapper, selector ),
+ slidesLength = slides.length;
+
+ let printMode = print.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( let i = 0; i < slidesLength; i++ ) {
+ let element = slides[i];
+
+ let reverse = config.rtl && !isVerticalSlide( element );
+
+ // Avoid .remove() with multiple args for IE11 support
+ 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
+ Util.queryAll( element, '.fragment' ).forEach( 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
+ Util.queryAll( element, '.fragment.visible' ).forEach( fragment => {
+ fragment.classList.remove( 'visible', 'current-fragment' );
+ } );
+ }
+ }
+ }
+
+ let slide = slides[index];
+ let wasPresent = slide.classList.contains( 'present' );
+
+ // Mark the current slide as present
+ slide.classList.add( 'present' );
+ slide.removeAttribute( 'hidden' );
+ slide.removeAttribute( 'aria-hidden' );
+
+ if( !wasPresent ) {
+ // Dispatch an event indicating the slide is now visible
+ dispatchEvent({
+ target: slide,
+ type: 'visible',
+ bubbles: false
+ });
+ }
+
+ // If this slide has a state associated with it, add it
+ // onto the current state of the deck
+ let slideState = slide.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
+ let horizontalSlides = getHorizontalSlides(),
+ horizontalSlidesLength = horizontalSlides.length,
+ distanceX,
+ distanceY;
+
+ if( horizontalSlidesLength && typeof indexh !== 'undefined' ) {
+
+ // The number of steps away from the present slide that will
+ // be visible
+ let viewDistance = overview.isActive() ? 10 : config.viewDistance;
+
+ // Shorten the view distance on devices that typically have
+ // less resources
+ if( Device.isMobile ) {
+ viewDistance = overview.isActive() ? 6 : config.mobileViewDistance;
+ }
+
+ // All slides need to be visible when exporting to PDF
+ if( print.isPrintingPDF() ) {
+ viewDistance = Number.MAX_VALUE;
+ }
+
+ for( let x = 0; x < horizontalSlidesLength; x++ ) {
+ let horizontalSlide = horizontalSlides[x];
+
+ let verticalSlides = Util.queryAll( horizontalSlide, '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 ) {
+ slideContent.load( horizontalSlide );
+ }
+ else {
+ slideContent.unload( horizontalSlide );
+ }
+
+ if( verticalSlidesLength ) {
+
+ let oy = getPreviousVerticalIndex( horizontalSlide );
+
+ for( let y = 0; y < verticalSlidesLength; y++ ) {
+ let verticalSlide = verticalSlides[y];
+
+ distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );
+
+ if( distanceX + distanceY < viewDistance ) {
+ slideContent.load( verticalSlide );
+ }
+ else {
+ slideContent.unload( verticalSlide );
+ }
+ }
+
+ }
+ }
+
+ // Flag if there are ANY vertical slides, anywhere in the deck
+ if( hasVerticalSlides() ) {
+ 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( hasHorizontalSlides() ) {
+ dom.wrapper.classList.add( 'has-horizontal-slides' );
+ }
+ else {
+ dom.wrapper.classList.remove( 'has-horizontal-slides' );
+ }
+
+ }
+
+ }
+
+ /**
+ * Determine what available routes there are for navigation.
+ *
+ * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}
+ */
+ function availableRoutes({ includeFragments = false } = {}) {
+
+ let horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
+ verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
+
+ let 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;
+ }
+ }
+
+ if ( horizontalSlides.length > 1 && config.navigationMode === 'linear' ) {
+ routes.right = routes.right || routes.down;
+ routes.left = routes.left || routes.up;
+ }
+
+ // If includeFragments is set, a route will be considered
+ // availalbe if either a slid OR fragment is available in
+ // the given direction
+ if( includeFragments === true ) {
+ let fragmentRoutes = fragments.availableRoutes();
+ routes.left = routes.left || fragmentRoutes.prev;
+ routes.up = routes.up || fragmentRoutes.prev;
+ routes.down = routes.down || fragmentRoutes.next;
+ routes.right = routes.right || fragmentRoutes.next;
+ }
+
+ // Reverse horizontal controls for rtl
+ if( config.rtl ) {
+ let left = routes.left;
+ routes.left = routes.right;
+ routes.right = left;
+ }
+
+ return routes;
+
+ }
+
+ /**
+ * Returns the number of past slides. This can be used as a global
+ * flattened index for slides.
+ *
+ * @param {HTMLElement} [slide=currentSlide] The slide we're counting before
+ *
+ * @return {number} Past slide count
+ */
+ function getSlidePastCount( slide = currentSlide ) {
+
+ let horizontalSlides = getHorizontalSlides();
+
+ // The number of past slides
+ let pastCount = 0;
+
+ // Step through all slides and count the past ones
+ mainLoop: for( let i = 0; i < horizontalSlides.length; i++ ) {
+
+ let horizontalSlide = horizontalSlides[i];
+ let verticalSlides = horizontalSlide.querySelectorAll( 'section' );
+
+ for( let j = 0; j < verticalSlides.length; j++ ) {
+
+ // Stop as soon as we arrive at the present
+ if( verticalSlides[j] === slide ) {
+ break mainLoop;
+ }
+
+ // Don't count slides with the "uncounted" class
+ if( verticalSlides[j].dataset.visibility !== 'uncounted' ) {
+ pastCount++;
+ }
+
+ }
+
+ // Stop as soon as we arrive at the present
+ if( horizontalSlide === slide ) {
+ break;
+ }
+
+ // Don't count the wrapping section for vertical slides and
+ // slides marked as uncounted
+ if( horizontalSlide.classList.contains( 'stack' ) === false && horizontalSlide.dataset.visibility !== 'uncounted' ) {
+ 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
+ let totalCount = getTotalSlides();
+ let pastCount = getSlidePastCount();
+
+ if( currentSlide ) {
+
+ let allFragments = currentSlide.querySelectorAll( '.fragment' );
+
+ // If there are fragments in the current slide those should be
+ // accounted for in the progress.
+ if( allFragments.length > 0 ) {
+ let 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)
+ let fragmentWeight = 0.9;
+
+ // Add fragment progress to the past slide count
+ pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;
+ }
+
+ }
+
+ return Math.min( pastCount / ( totalCount - 1 ), 1 );
+
+ }
+
+ /**
+ * 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
+ let h = indexh,
+ v = indexv,
+ f;
+
+ // If a slide is specified, return the indices of that slide
+ if( slide ) {
+ let isVertical = isVerticalSlide( slide );
+ let slideh = isVertical ? slide.parentNode : slide;
+
+ // Select all horizontal slides
+ let horizontalSlides = getHorizontalSlides();
+
+ // 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( Util.queryAll( slide.parentNode, 'section' ).indexOf( slide ), 0 );
+ }
+ }
+
+ if( !slide && currentSlide ) {
+ let hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;
+ if( hasFragments ) {
+ let 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, v, f };
+
+ }
+
+ /**
+ * Retrieves all slides in this presentation.
+ */
+ function getSlides() {
+
+ return Util.queryAll( dom.wrapper, SLIDES_SELECTOR + ':not(.stack):not([data-visibility="uncounted"])' );
+
+ }
+
+ /**
+ * Returns a list of all horizontal slides in the deck. Each
+ * vertical stack is included as one horizontal slide in the
+ * resulting array.
+ */
+ function getHorizontalSlides() {
+
+ return Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR );
+
+ }
+
+ /**
+ * Returns all vertical slides that exist within this deck.
+ */
+ function getVerticalSlides() {
+
+ return Util.queryAll( dom.wrapper, '.slides>section>section' );
+
+ }
+
+ /**
+ * Returns all vertical stacks (each stack can contain multiple slides).
+ */
+ function getVerticalStacks() {
+
+ return Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.stack');
+
+ }
+
+ /**
+ * Returns true if there are at least two horizontal slides.
+ */
+ function hasHorizontalSlides() {
+
+ return getHorizontalSlides().length > 1;
+ }
+
+ /**
+ * Returns true if there are at least two vertical slides.
+ */
+ function hasVerticalSlides() {
+
+ return getVerticalSlides().length > 1;
+
+ }
+
+ /**
+ * Returns an array of objects where each object represents the
+ * attributes on its respective slide.
+ */
+ function getSlidesAttributes() {
+
+ return getSlides().map( slide => {
+
+ let attributes = {};
+ for( let i = 0; i < slide.attributes.length; i++ ) {
+ let 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 ) {
+
+ let horizontalSlide = getHorizontalSlides()[ x ];
+ let 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 ) {
+
+ let slide = typeof x === 'number' ? getSlide( x, y ) : x;
+ if( slide ) {
+ return slide.slideBackgroundElement;
+ }
+
+ return undefined;
+
+ }
+
+ /**
+ * 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() {
+
+ let indices = getIndices();
+
+ return {
+ indexh: indices.h,
+ indexv: indices.v,
+ indexf: indices.f,
+ paused: isPaused(),
+ overview: overview.isActive()
+ };
+
+ }
+
+ /**
+ * 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( Util.deserialize( state.indexh ), Util.deserialize( state.indexv ), Util.deserialize( state.indexf ) );
+
+ let pausedFlag = Util.deserialize( state.paused ),
+ overviewFlag = Util.deserialize( state.overview );
+
+ if( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {
+ togglePause( pausedFlag );
+ }
+
+ if( typeof overviewFlag === 'boolean' && overviewFlag !== overview.isActive() ) {
+ overview.toggle( overviewFlag );
+ }
+ }
+
+ }
+
+ /**
+ * Cues a new automated slide if enabled in the config.
+ */
+ function cueAutoSlide() {
+
+ cancelAutoSlide();
+
+ if( currentSlide && config.autoSlide !== false ) {
+
+ let 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' );
+
+ let fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;
+ let parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;
+ let 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 ) {
+ Util.queryAll( currentSlide, 'video, audio' ).forEach( 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() && !overview.isActive() && ( !isLastSlide() || fragments.availableRoutes().next || config.loop === true ) ) {
+ autoSlideTimeout = setTimeout( () => {
+ if( typeof config.autoSlideMethod === 'function' ) {
+ config.autoSlideMethod()
+ }
+ else {
+ 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({ type: 'autoslidepaused' });
+ clearTimeout( autoSlideTimeout );
+
+ if( autoSlidePlayer ) {
+ autoSlidePlayer.setPlaying( false );
+ }
+ }
+
+ }
+
+ function resumeAutoSlide() {
+
+ if( autoSlide && autoSlidePaused ) {
+ autoSlidePaused = false;
+ dispatchEvent({ type: 'autoslideresumed' });
+ cueAutoSlide();
+ }
+
+ }
+
+ function navigateLeft() {
+
+ navigationHistory.hasNavigatedHorizontally = true;
+
+ // Reverse for RTL
+ if( config.rtl ) {
+ if( ( overview.isActive() || fragments.next() === false ) && availableRoutes().left ) {
+ slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
+ }
+ }
+ // Normal navigation
+ else if( ( overview.isActive() || fragments.prev() === false ) && availableRoutes().left ) {
+ slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
+ }
+
+ }
+
+ function navigateRight() {
+
+ navigationHistory.hasNavigatedHorizontally = true;
+
+ // Reverse for RTL
+ if( config.rtl ) {
+ if( ( overview.isActive() || fragments.prev() === false ) && availableRoutes().right ) {
+ slide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );
+ }
+ }
+ // Normal navigation
+ else if( ( overview.isActive() || fragments.next() === false ) && availableRoutes().right ) {
+ slide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );
+ }
+
+ }
+
+ function navigateUp() {
+
+ // Prioritize hiding fragments
+ if( ( overview.isActive() || fragments.prev() === false ) && availableRoutes().up ) {
+ slide( indexh, indexv - 1 );
+ }
+
+ }
+
+ function navigateDown() {
+
+ navigationHistory.hasNavigatedVertically = true;
+
+ // Prioritize revealing fragments
+ if( ( overview.isActive() || fragments.next() === 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( fragments.prev() === false ) {
+ if( availableRoutes().up ) {
+ navigateUp();
+ }
+ else {
+ // Fetch the previous horizontal slide, if there is one
+ let previousSlide;
+
+ if( config.rtl ) {
+ previousSlide = Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.future' ).pop();
+ }
+ else {
+ previousSlide = Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.past' ).pop();
+ }
+
+ if( previousSlide ) {
+ let v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;
+ let h = indexh - 1;
+ slide( h, v );
+ }
+ }
+ }
+
+ }
+
+ /**
+ * The reverse of #navigatePrev().
+ */
+ function navigateNext() {
+
+ navigationHistory.hasNavigatedHorizontally = true;
+ navigationHistory.hasNavigatedVertically = true;
+
+ // Prioritize revealing fragments
+ if( fragments.next() === false ) {
+
+ let 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 && isLastVerticalSlide() ) {
+ routes.down = false;
+ }
+
+ if( routes.down ) {
+ navigateDown();
+ }
+ else if( config.rtl ) {
+ navigateLeft();
+ }
+ else {
+ navigateRight();
+ }
+ }
+
+ }
+
+
+ // --------------------------------------------------------------------//
+ // ----------------------------- EVENTS -------------------------------//
+ // --------------------------------------------------------------------//
+
+ /**
+ * Called by all event handlers that are based on user
+ * input.
+ *
+ * @param {object} [event]
+ */
+ function onUserInput( event ) {
+
+ if( config.autoSlideStoppable ) {
+ pauseAutoSlide();
+ }
+
+ }
+
+ /**
+ * Event listener for transition end on the current slide.
+ *
+ * @param {object} [event]
+ */
+ function onTransitionEnd( event ) {
+
+ if( transition === 'running' && /section/gi.test( event.target.nodeName ) ) {
+ transition = 'idle';
+ dispatchEvent({
+ type: 'slidetransitionend',
+ data: { indexh, indexv, previousSlide, currentSlide }
+ });
+ }
+
+ }
+
+ /**
+ * 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 ) {
+
+ // If, after clicking a link or similar and we're coming back,
+ // focus the document.body to ensure we can use keyboard shortcuts
+ if( document.hidden === 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();
+ }
+
+ }
+
+ /**
+ * 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' ) ) {
+ let 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( isLastSlide() && config.loop === false ) {
+ slide( 0, 0 );
+ resumeAutoSlide();
+ }
+ // Resume
+ else if( autoSlidePaused ) {
+ resumeAutoSlide();
+ }
+ // Pause
+ else {
+ pauseAutoSlide();
+ }
+
+ }
+
+
+ // --------------------------------------------------------------------//
+ // ------------------------------- API --------------------------------//
+ // --------------------------------------------------------------------//
+
+ // The public reveal.js API
+ const API = {
+ VERSION,
+
+ initialize,
+ configure,
+
+ sync,
+ syncSlide,
+ syncFragments: fragments.sync.bind( fragments ),
+
+ // Navigation methods
+ slide,
+ left: navigateLeft,
+ right: navigateRight,
+ up: navigateUp,
+ down: navigateDown,
+ prev: navigatePrev,
+ next: navigateNext,
+
+ // Navigation aliases
+ navigateLeft, navigateRight, navigateUp, navigateDown, navigatePrev, navigateNext,
+
+ // Fragment methods
+ navigateFragment: fragments.goto.bind( fragments ),
+ prevFragment: fragments.prev.bind( fragments ),
+ nextFragment: fragments.next.bind( fragments ),
+
+ // Event binding
+ on,
+ off,
+
+ // Legacy event binding methods left in for backwards compatibility
+ addEventListener: on,
+ removeEventListener: off,
+
+ // Forces an update in slide layout
+ layout,
+
+ // Randomizes the order of slides
+ shuffle,
+
+ // Returns an object with the available routes as booleans (left/right/top/bottom)
+ availableRoutes,
+
+ // Returns an object with the available fragments as booleans (prev/next)
+ availableFragments: fragments.availableRoutes.bind( fragments ),
+
+ // Toggles a help overlay with keyboard shortcuts
+ toggleHelp,
+
+ // Toggles the overview mode on/off
+ toggleOverview: overview.toggle.bind( overview ),
+
+ // Toggles the "black screen" mode on/off
+ togglePause,
+
+ // Toggles the auto slide mode on/off
+ toggleAutoSlide,
+
+ // Slide navigation checks
+ isFirstSlide,
+ isLastSlide,
+ isLastVerticalSlide,
+ isVerticalSlide,
+
+ // State checks
+ isPaused,
+ isAutoSliding,
+ isSpeakerNotes: notes.isSpeakerNotesWindow.bind( notes ),
+ isOverview: overview.isActive.bind( overview ),
+ isFocused: focus.isFocused.bind( focus ),
+ isPrintingPDF: print.isPrintingPDF.bind( print ),
+
+ // Checks if reveal.js has been loaded and is ready for use
+ isReady: () => ready,
+
+ // Slide preloading
+ loadSlide: slideContent.load.bind( slideContent ),
+ unloadSlide: slideContent.unload.bind( slideContent ),
+
+ // Preview management
+ showPreview,
+ hidePreview: closeOverlay,
+
+ // Adds or removes all internal event listeners
+ addEventListeners,
+ removeEventListeners,
+ dispatchEvent,
+
+ // Facility for persisting and restoring the presentation state
+ getState,
+ setState,
+
+ // Presentation progress on range of 0-1
+ getProgress,
+
+ // Returns the indices of the current, or specified, slide
+ getIndices,
+
+ // Returns an Array of key:value maps of the attributes of each
+ // slide in the deck
+ getSlidesAttributes,
+
+ // Returns the number of slides that we have passed
+ getSlidePastCount,
+
+ // Returns the total number of slides
+ getTotalSlides,
+
+ // Returns the slide element at the specified index
+ getSlide,
+
+ // Returns the previous slide element, may be null
+ getPreviousSlide: () => previousSlide,
+
+ // Returns the current slide element
+ getCurrentSlide: () => currentSlide,
+
+ // Returns the slide background element at the specified index
+ getSlideBackground,
+
+ // Returns the speaker notes string for a slide, or null
+ getSlideNotes: notes.getSlideNotes.bind( notes ),
+
+ // Returns an Array of all slides
+ getSlides,
+
+ // Returns an array with all horizontal/vertical slides in the deck
+ getHorizontalSlides,
+ getVerticalSlides,
+
+ // Checks if the presentation contains two or more horizontal
+ // and vertical slides
+ hasHorizontalSlides,
+ hasVerticalSlides,
+
+ // Checks if the deck has navigated on either axis at least once
+ hasNavigatedHorizontally: () => navigationHistory.hasNavigatedHorizontally,
+ hasNavigatedVertically: () => navigationHistory.hasNavigatedVertically,
+
+ // Adds/removes a custom key binding
+ addKeyBinding: keyboard.addKeyBinding.bind( keyboard ),
+ removeKeyBinding: keyboard.removeKeyBinding.bind( keyboard ),
+
+ // Programmatically triggers a keyboard event
+ triggerKey: keyboard.triggerKey.bind( keyboard ),
+
+ // Registers a new shortcut to include in the help overlay
+ registerKeyboardShortcut: keyboard.registerKeyboardShortcut.bind( keyboard ),
+
+ getComputedSlideSize,
+
+ // Returns the current scale of the presentation content
+ getScale: () => scale,
+
+ // Returns the current configuration object
+ getConfig: () => config,
+
+ // Helper method, retrieves query string as a key:value map
+ getQueryHash: Util.getQueryHash,
+
+ // Returns reveal.js DOM elements
+ getRevealElement: () => revealElement,
+ getSlidesElement: () => dom.slides,
+ getViewportElement: () => dom.viewport,
+ getBackgroundsElement: () => backgrounds.element,
+
+ // API for registering and retrieving plugins
+ registerPlugin: plugins.registerPlugin.bind( plugins ),
+ hasPlugin: plugins.hasPlugin.bind( plugins ),
+ getPlugin: plugins.getPlugin.bind( plugins ),
+ getPlugins: plugins.getRegisteredPlugins.bind( plugins )
+
+ };
+
+ // Our internal API which controllers have access to
+ Util.extend( Reveal, {
+ ...API,
+
+ // Methods for announcing content to screen readers
+ announceStatus,
+ getStatusText,
+
+ // Controllers
+ print,
+ focus,
+ progress,
+ controls,
+ location,
+ overview,
+ fragments,
+ slideContent,
+ slideNumber,
+
+ onUserInput,
+ closeOverlay,
+ updateSlidesVisibility,
+ layoutSlideContents,
+ transformSlides,
+ cueAutoSlide,
+ cancelAutoSlide
+ } );
+
+ return API;
+
+};
diff --git a/inst/reveal.js-4.1.2/js/utils/color.js b/inst/reveal.js-4.1.2/js/utils/color.js
new file mode 100644
index 0000000..1043f83
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/utils/color.js
@@ -0,0 +1,77 @@
+/**
+ * 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}
+ */
+export const colorToRgb = ( color ) => {
+
+ let 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
+ };
+ }
+
+ let 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 )
+ };
+ }
+
+ let 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 )
+ };
+ }
+
+ let 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}
+ */
+export const colorBrightness = ( color ) => {
+
+ if( typeof color === 'string' ) color = colorToRgb( color );
+
+ if( color ) {
+ return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
+ }
+
+ return null;
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/utils/constants.js b/inst/reveal.js-4.1.2/js/utils/constants.js
new file mode 100644
index 0000000..6c2382e
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/utils/constants.js
@@ -0,0 +1,10 @@
+
+export const SLIDES_SELECTOR = '.slides section';
+export const HORIZONTAL_SLIDES_SELECTOR = '.slides>section';
+export const VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section';
+
+// Methods that may not be invoked via the postMessage API
+export const POST_MESSAGE_METHOD_BLACKLIST = /registerPlugin|registerKeyboardShortcut|addKeyBinding|addEventListener/;
+
+// Regex for retrieving the fragment style from a class attribute
+export const FRAGMENT_STYLE_REGEX = /fade-(down|up|right|left|out|in-then-out|in-then-semi-out)|semi-fade-out|current-visible|shrink|grow/;
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/utils/device.js b/inst/reveal.js-4.1.2/js/utils/device.js
new file mode 100644
index 0000000..ec1034f
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/utils/device.js
@@ -0,0 +1,15 @@
+const UA = navigator.userAgent;
+const testElement = document.createElement( 'div' );
+
+export const isMobile = /(iphone|ipod|ipad|android)/gi.test( UA ) ||
+ ( navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1 ); // iPadOS
+
+export const isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
+
+export const isAndroid = /android/gi.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 whitelisted browsers.
+export const supportsZoom = 'zoom' in testElement.style && !isMobile &&
+ ( isChrome || /Version\/[\d\.]+.*Safari/.test( UA ) );
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/utils/loader.js b/inst/reveal.js-4.1.2/js/utils/loader.js
new file mode 100644
index 0000000..58d39ac
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/utils/loader.js
@@ -0,0 +1,46 @@
+/**
+ * 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
+ */
+export const loadScript = ( url, callback ) => {
+
+ const script = document.createElement( 'script' );
+ script.type = 'text/javascript';
+ script.async = false;
+ script.defer = false;
+ script.src = url;
+
+ if( typeof callback === 'function' ) {
+
+ // Success callback
+ script.onload = script.onreadystatechange = 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 = 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>
+ const head = document.querySelector( 'head' );
+ head.insertBefore( script, head.lastChild );
+
+}
\ No newline at end of file
diff --git a/inst/reveal.js-4.1.2/js/utils/util.js b/inst/reveal.js-4.1.2/js/utils/util.js
new file mode 100644
index 0000000..68ff085
--- /dev/null
+++ b/inst/reveal.js-4.1.2/js/utils/util.js
@@ -0,0 +1,282 @@
+/**
+ * Extend object a with the properties of object b.
+ * If there's a conflict, object b takes precedence.
+ *
+ * @param {object} a
+ * @param {object} b
+ */
+export const extend = ( a, b ) => {
+
+ for( let i in b ) {
+ a[ i ] = b[ i ];
+ }
+
+ return a;
+
+}
+
+/**
+ * querySelectorAll but returns an Array.
+ */
+export const queryAll = ( el, selector ) => {
+
+ return Array.from( el.querySelectorAll( selector ) );
+
+}
+
+/**
+ * classList.toggle() with cross browser support
+ */
+export const toggleClass = ( el, className, value ) => {
+ if( value ) {
+ el.classList.add( className );
+ }
+ else {
+ el.classList.remove( className );
+ }
+}
+
+/**
+ * Utility for deserializing a value.
+ *
+ * @param {*} value
+ * @return {*}
+ */
+export const 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}
+ */
+export const distanceBetween = ( a, b ) => {
+
+ let 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
+ */
+export const transformElement = ( element, transform ) => {
+
+ element.style.transform = transform;
+
+}
+
+/**
+ * Element.matches with IE support.
+ *
+ * @param {HTMLElement} target The element to match
+ * @param {String} selector The CSS selector to match
+ * the element against
+ *
+ * @return {Boolean}
+ */
+export const matches = ( target, selector ) => {
+
+ let matchesMethod = target.matches || target.matchesSelector || target.msMatchesSelector;
+
+ return !!( matchesMethod && matchesMethod.call( target, selector ) );
+
+}
+
+/**
+ * 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
+ */
+export const closest = ( target, selector ) => {
+
+ // Native Element.closest
+ if( typeof target.closest === 'function' ) {
+ return target.closest( selector );
+ }
+
+ // Polyfill
+ while( target ) {
+ if( matches( target, selector ) ) {
+ return target;
+ }
+
+ // Keep searching
+ target = target.parentNode;
+ }
+
+ return null;
+
+}
+
+/**
+ * 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
+ */
+export const enterFullscreen = element => {
+
+ element = element || document.documentElement;
+
+ // Check which implementation is available
+ let requestMethod = element.requestFullscreen ||
+ element.webkitRequestFullscreen ||
+ element.webkitRequestFullScreen ||
+ element.mozRequestFullScreen ||
+ element.msRequestFullscreen;
+
+ if( requestMethod ) {
+ requestMethod.apply( element );
+ }
+
+}
+
+/**
+ * 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}
+ */
+export const createSingletonNode = ( container, tagname, classname, innerHTML='' ) => {
+
+ // Find all nodes matching the description
+ let nodes = container.querySelectorAll( '.' + classname );
+
+ // Check all matches to find one which is a direct child of
+ // the specified container
+ for( let i = 0; i < nodes.length; i++ ) {
+ let testNode = nodes[i];
+ if( testNode.parentNode === container ) {
+ return testNode;
+ }
+ }
+
+ // If no node was found, create it now
+ let node = document.createElement( tagname );
+ node.className = classname;
+ node.innerHTML = innerHTML;
+ container.appendChild( node );
+
+ return node;
+
+}
+
+/**
+ * Injects the given CSS styles into the DOM.
+ *
+ * @param {string} value
+ */
+export const createStyleSheet = ( value ) => {
+
+ let tag = document.createElement( 'style' );
+ tag.type = 'text/css';
+
+ if( value && value.length > 0 ) {
+ if( tag.styleSheet ) {
+ tag.styleSheet.cssText = value;
+ }
+ else {
+ tag.appendChild( document.createTextNode( value ) );
+ }
+ }
+
+ document.head.appendChild( tag );
+
+ return tag;
+
+}
+
+/**
+ * Returns a key:value hash of all query params.
+ */
+export const getQueryHash = () => {
+
+ let query = {};
+
+ location.search.replace( /[A-Z0-9]+?=([\w\.%-]*)/gi, a => {
+ query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
+ } );
+
+ // Basic deserialization
+ for( let i in query ) {
+ let value = query[ i ];
+
+ query[ i ] = deserialize( unescape( value ) );
+ }
+
+ // Do not accept new dependencies via query config to avoid
+ // the potential of malicious script injection
+ if( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];
+
+ return query;
+
+}
+
+/**
+ * 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]
+ */
+export const getRemainingHeight = ( element, height = 0 ) => {
+
+ if( element ) {
+ let 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;
+
+}
\ No newline at end of file