diff --git a/2018-04 Bash/This Is The Presentation slides.htm b/2018-04 Bash/This Is The Presentation slides.htm deleted file mode 100644 index 19b589a..0000000 --- a/2018-04 Bash/This Is The Presentation slides.htm +++ /dev/null @@ -1,22906 +0,0 @@ - - - - - - - - - - -This Is The Presentation slides - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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HODL-AI: Live Coding RNN on the Blockchain

Machine Learning Mega Bash

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2018/04/23 - Blackbox, Belfast

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This presentation and associated files are available at present.bolster.online

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- - - - -HODL-AI: Live Coding RNN on the BlockchainMachine Learning Mega Bash -2018/04/23 - Blackbox, Belfast -This presentation and associated files are available at present.bolster.online - - - -
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' - ].join(''); - - dom.overlay.querySelector( '.close' ).addEventListener( 'click', function( event ) { - closeOverlay(); - event.preventDefault(); - }, false ); - - setTimeout( function() { - dom.overlay.classList.add( 'visible' ); - }, 1 ); - - } - - } - - /** - * Closes any currently open overlay. - */ - function closeOverlay() { - - if( dom.overlay ) { - dom.overlay.parentNode.removeChild( dom.overlay ); - dom.overlay = null; - } - - } - - /** - * Applies JavaScript-controlled layout rules to the - * presentation. - */ - function layout() { - - if( dom.wrapper && !isPrintingPDF() ) { - - var size = getComputedSlideSize(); - - // Layout the contents of the slides - layoutSlideContents( config.width, config.height ); - - dom.slides.style.width = size.width + 'px'; - dom.slides.style.height = size.height + 'px'; - - // Determine scale of content to fit within available space - scale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height ); - - // Respect max/min scale settings - scale = Math.max( scale, config.minScale ); - scale = Math.min( scale, config.maxScale ); - - // Don't apply any scaling styles if scale is 1 - if( scale === 1 ) { - dom.slides.style.zoom = ''; - dom.slides.style.left = ''; - dom.slides.style.top = ''; - dom.slides.style.bottom = ''; - dom.slides.style.right = ''; - transformSlides( { layout: '' } ); - } - else { - // Prefer zoom for scaling up so that content remains crisp. - // Don't use zoom to scale down since that can lead to shifts - // in text layout/line breaks. - if( scale > 1 && features.zoom ) { - dom.slides.style.zoom = scale; - dom.slides.style.left = ''; - dom.slides.style.top = ''; - dom.slides.style.bottom = ''; - dom.slides.style.right = ''; - transformSlides( { layout: '' } ); - } - // Apply scale transform as a fallback - else { - dom.slides.style.zoom = ''; - dom.slides.style.left = '50%'; - dom.slides.style.top = '50%'; - dom.slides.style.bottom = 'auto'; - dom.slides.style.right = 'auto'; - transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } ); - } - } - - // Select all slides, vertical and horizontal - var slides = toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ); - - for( var i = 0, len = slides.length; i < len; i++ ) { - var slide = slides[ i ]; - - // Don't bother updating invisible slides - if( slide.style.display === 'none' ) { - continue; - } - - if( config.center || slide.classList.contains( 'center' ) ) { - // Vertical stacks are not centred since their section - // children will be - if( slide.classList.contains( 'stack' ) ) { - slide.style.top = 0; - } - else { - slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px'; - } - } - else { - slide.style.top = ''; - } - - } - - updateProgress(); - updateParallax(); - - if( isOverview() ) { - updateOverview(); - } - - } - - } - - /** - * Applies layout logic to the contents of all slides in - * the presentation. - * - * @param {string|number} width - * @param {string|number} height - */ - function layoutSlideContents( width, height ) { - - // Handle sizing of elements with the 'stretch' class - toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) { - - // Determine how much vertical space we can use - var remainingHeight = getRemainingHeight( element, height ); - - // Consider the aspect ratio of media elements - if( /(img|video)/gi.test( element.nodeName ) ) { - var nw = element.naturalWidth || element.videoWidth, - nh = element.naturalHeight || element.videoHeight; - - var es = Math.min( width / nw, remainingHeight / nh ); - - element.style.width = ( nw * es ) + 'px'; - element.style.height = ( nh * es ) + 'px'; - - } - else { - element.style.width = width + 'px'; - element.style.height = remainingHeight + 'px'; - } - - } ); - - } - - /** - * Calculates the computed pixel size of our slides. These - * values are based on the width and height configuration - * options. - * - * @param {number} [presentationWidth=dom.wrapper.offsetWidth] - * @param {number} [presentationHeight=dom.wrapper.offsetHeight] - */ - function getComputedSlideSize( presentationWidth, presentationHeight ) { - - var size = { - // Slide size - width: config.width, - height: config.height, - - // Presentation size - presentationWidth: presentationWidth || dom.wrapper.offsetWidth, - presentationHeight: presentationHeight || dom.wrapper.offsetHeight - }; - - // Reduce available space by margin - size.presentationWidth -= ( size.presentationWidth * config.margin ); - size.presentationHeight -= ( size.presentationHeight * config.margin ); - - // Slide width may be a percentage of available width - if( typeof size.width === 'string' && /%$/.test( size.width ) ) { - size.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth; - } - - // Slide height may be a percentage of available height - if( typeof size.height === 'string' && /%$/.test( size.height ) ) { - size.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight; - } - - return size; - - } - - /** - * Stores the vertical index of a stack so that the same - * vertical slide can be selected when navigating to and - * from the stack. - * - * @param {HTMLElement} stack The vertical stack element - * @param {string|number} [v=0] Index to memorize - */ - function setPreviousVerticalIndex( stack, v ) { - - if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) { - stack.setAttribute( 'data-previous-indexv', v || 0 ); - } - - } - - /** - * Retrieves the vertical index which was stored using - * #setPreviousVerticalIndex() or 0 if no previous index - * exists. - * - * @param {HTMLElement} stack The vertical stack element - */ - function getPreviousVerticalIndex( stack ) { - - if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) { - // Prefer manually defined start-indexv - var attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv'; - - return parseInt( stack.getAttribute( attributeName ) || 0, 10 ); - } - - return 0; - - } - - /** - * Displays the overview of slides (quick nav) by scaling - * down and arranging all slide elements. - */ - function activateOverview() { - - // Only proceed if enabled in config - if( config.overview && !isOverview() ) { - - overview = true; - - dom.wrapper.classList.add( 'overview' ); - dom.wrapper.classList.remove( 'overview-deactivating' ); - - if( features.overviewTransitions ) { - setTimeout( function() { - dom.wrapper.classList.add( 'overview-animated' ); - }, 1 ); - } - - // Don't auto-slide while in overview mode - cancelAutoSlide(); - - // Move the backgrounds element into the slide container to - // that the same scaling is applied - dom.slides.appendChild( dom.background ); - - // Clicking on an overview slide navigates to it - toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) { - if( !slide.classList.contains( 'stack' ) ) { - slide.addEventListener( 'click', onOverviewSlideClicked, true ); - } - } ); - - // Calculate slide sizes - var margin = 70; - var slideSize = getComputedSlideSize(); - overviewSlideWidth = slideSize.width + margin; - overviewSlideHeight = slideSize.height + margin; - - // Reverse in RTL mode - if( config.rtl ) { - overviewSlideWidth = -overviewSlideWidth; - } - - updateSlidesVisibility(); - layoutOverview(); - updateOverview(); - - layout(); - - // Notify observers of the overview showing - dispatchEvent( 'overviewshown', { - 'indexh': indexh, - 'indexv': indexv, - 'currentSlide': currentSlide - } ); - - } - - } - - /** - * Uses CSS transforms to position all slides in a grid for - * display inside of the overview mode. - */ - function layoutOverview() { - - // Layout slides - toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) { - hslide.setAttribute( 'data-index-h', h ); - transformElement( hslide, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' ); - - if( hslide.classList.contains( 'stack' ) ) { - - toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) { - vslide.setAttribute( 'data-index-h', h ); - vslide.setAttribute( 'data-index-v', v ); - - transformElement( vslide, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' ); - } ); - - } - } ); - - // Layout slide backgrounds - toArray( dom.background.childNodes ).forEach( function( hbackground, h ) { - transformElement( hbackground, 'translate3d(' + ( h * overviewSlideWidth ) + 'px, 0, 0)' ); - - toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) { - transformElement( vbackground, 'translate3d(0, ' + ( v * overviewSlideHeight ) + 'px, 0)' ); - } ); - } ); - - } - - /** - * Moves the overview viewport to the current slides. - * Called each time the current slide changes. - */ - function updateOverview() { - - var vmin = Math.min( window.innerWidth, window.innerHeight ); - var scale = Math.max( vmin / 5, 150 ) / vmin; - - transformSlides( { - overview: [ - 'scale('+ scale +')', - 'translateX('+ ( -indexh * overviewSlideWidth ) +'px)', - 'translateY('+ ( -indexv * overviewSlideHeight ) +'px)' - ].join( ' ' ) - } ); - - } - - /** - * Exits the slide overview and enters the currently - * active slide. - */ - function deactivateOverview() { - - // Only proceed if enabled in config - if( config.overview ) { - - overview = false; - - dom.wrapper.classList.remove( 'overview' ); - dom.wrapper.classList.remove( 'overview-animated' ); - - // Temporarily add a class so that transitions can do different things - // depending on whether they are exiting/entering overview, or just - // moving from slide to slide - dom.wrapper.classList.add( 'overview-deactivating' ); - - setTimeout( function () { - dom.wrapper.classList.remove( 'overview-deactivating' ); - }, 1 ); - - // Move the background element back out - dom.wrapper.appendChild( dom.background ); - - // Clean up changes made to slides - toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) { - transformElement( slide, '' ); - - slide.removeEventListener( 'click', onOverviewSlideClicked, true ); - } ); - - // Clean up changes made to backgrounds - toArray( dom.background.querySelectorAll( '.slide-background' ) ).forEach( function( background ) { - transformElement( background, '' ); - } ); - - transformSlides( { overview: '' } ); - - slide( indexh, indexv ); - - layout(); - - cueAutoSlide(); - - // Notify observers of the overview hiding - dispatchEvent( 'overviewhidden', { - 'indexh': indexh, - 'indexv': indexv, - 'currentSlide': currentSlide - } ); - - } - } - - /** - * Toggles the slide overview mode on and off. - * - * @param {Boolean} [override] Flag which overrides the - * toggle logic and forcibly sets the desired state. True means - * overview is open, false means it's closed. - */ - function toggleOverview( override ) { - - if( typeof override === 'boolean' ) { - override ? activateOverview() : deactivateOverview(); - } - else { - isOverview() ? deactivateOverview() : activateOverview(); - } - - } - - /** - * Checks if the overview is currently active. - * - * @return {Boolean} true if the overview is active, - * false otherwise - */ - function isOverview() { - - return overview; - - } - - /** - * Checks if the current or specified slide is vertical - * (nested within another slide). - * - * @param {HTMLElement} [slide=currentSlide] The slide to check - * orientation of - * @return {Boolean} - */ - function isVerticalSlide( slide ) { - - // Prefer slide argument, otherwise use current slide - slide = slide ? slide : currentSlide; - - return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i ); - - } - - /** - * Handling the fullscreen functionality via the fullscreen API - * - * @see http://fullscreen.spec.whatwg.org/ - * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode - */ - function enterFullscreen() { - - var element = document.documentElement; - - // Check which implementation is available - var requestMethod = element.requestFullscreen || - element.webkitRequestFullscreen || - element.webkitRequestFullScreen || - element.mozRequestFullScreen || - element.msRequestFullscreen; - - if( requestMethod ) { - requestMethod.apply( element ); - } - - } - - /** - * Enters the paused mode which fades everything on screen to - * black. - */ - function pause() { - - if( config.pause ) { - var wasPaused = dom.wrapper.classList.contains( 'paused' ); - - cancelAutoSlide(); - dom.wrapper.classList.add( 'paused' ); - - if( wasPaused === false ) { - dispatchEvent( 'paused' ); - } - } - - } - - /** - * Exits from the paused mode. - */ - function resume() { - - var wasPaused = dom.wrapper.classList.contains( 'paused' ); - dom.wrapper.classList.remove( 'paused' ); - - cueAutoSlide(); - - if( wasPaused ) { - dispatchEvent( 'resumed' ); - } - - } - - /** - * Toggles the paused mode on and off. - */ - function togglePause( override ) { - - if( typeof override === 'boolean' ) { - override ? pause() : resume(); - } - else { - isPaused() ? resume() : pause(); - } - - } - - /** - * Checks if we are currently in the paused mode. - * - * @return {Boolean} - */ - function isPaused() { - - return dom.wrapper.classList.contains( 'paused' ); - - } - - /** - * Toggles the auto slide mode on and off. - * - * @param {Boolean} [override] Flag which sets the desired state. - * True means autoplay starts, false means it stops. - */ - - function toggleAutoSlide( override ) { - - if( typeof override === 'boolean' ) { - override ? resumeAutoSlide() : pauseAutoSlide(); - } - - else { - autoSlidePaused ? resumeAutoSlide() : pauseAutoSlide(); - } - - } - - /** - * Checks if the auto slide mode is currently on. - * - * @return {Boolean} - */ - function isAutoSliding() { - - return !!( autoSlide && !autoSlidePaused ); - - } - - /** - * Steps from the current point in the presentation to the - * slide which matches the specified horizontal and vertical - * indices. - * - * @param {number} [h=indexh] Horizontal index of the target slide - * @param {number} [v=indexv] Vertical index of the target slide - * @param {number} [f] Index of a fragment within the - * target slide to activate - * @param {number} [o] Origin for use in multimaster environments - */ - function slide( h, v, f, o ) { - - // Remember where we were at before - previousSlide = currentSlide; - - // Query all horizontal slides in the deck - var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ); - - // Abort if there are no slides - if( horizontalSlides.length === 0 ) return; - - // If no vertical index is specified and the upcoming slide is a - // stack, resume at its previous vertical index - if( v === undefined && !isOverview() ) { - v = getPreviousVerticalIndex( horizontalSlides[ h ] ); - } - - // If we were on a vertical stack, remember what vertical index - // it was on so we can resume at the same position when returning - if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) { - setPreviousVerticalIndex( previousSlide.parentNode, indexv ); - } - - // Remember the state before this slide - var stateBefore = state.concat(); - - // Reset the state array - state.length = 0; - - var indexhBefore = indexh || 0, - indexvBefore = indexv || 0; - - // Activate and transition to the new slide - indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h ); - indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v ); - - // Update the visibility of slides now that the indices have changed - updateSlidesVisibility(); - - layout(); - - // Apply the new state - stateLoop: for( var i = 0, len = state.length; i < len; i++ ) { - // Check if this state existed on the previous slide. If it - // did, we will avoid adding it repeatedly - for( var j = 0; j < stateBefore.length; j++ ) { - if( stateBefore[j] === state[i] ) { - stateBefore.splice( j, 1 ); - continue stateLoop; - } - } - - document.documentElement.classList.add( state[i] ); - - // Dispatch custom event matching the state's name - dispatchEvent( state[i] ); - } - - // Clean up the remains of the previous state - while( stateBefore.length ) { - document.documentElement.classList.remove( stateBefore.pop() ); - } - - // Update the overview if it's currently active - if( isOverview() ) { - updateOverview(); - } - - // Find the current horizontal slide and any possible vertical slides - // within it - var currentHorizontalSlide = horizontalSlides[ indexh ], - currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' ); - - // Store references to the previous and current slides - currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide; - - // Show fragment, if specified - if( typeof f !== 'undefined' ) { - navigateFragment( f ); - } - - // Dispatch an event if the slide changed - var slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore ); - if( slideChanged ) { - dispatchEvent( 'slidechanged', { - 'indexh': indexh, - 'indexv': indexv, - 'previousSlide': previousSlide, - 'currentSlide': currentSlide, - 'origin': o - } ); - } - else { - // Ensure that the previous slide is never the same as the current - previousSlide = null; - } - - // Solves an edge case where the previous slide maintains the - // 'present' class when navigating between adjacent vertical - // stacks - if( previousSlide ) { - previousSlide.classList.remove( 'present' ); - previousSlide.setAttribute( 'aria-hidden', 'true' ); - - // Reset all slides upon navigate to home - // Issue: #285 - if ( dom.wrapper.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) { - // Launch async task - setTimeout( function () { - var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i; - for( i in slides ) { - if( slides[i] ) { - // Reset stack - setPreviousVerticalIndex( slides[i], 0 ); - } - } - }, 0 ); - } - } - - // Handle embedded content - if( slideChanged || !previousSlide ) { - stopEmbeddedContent( previousSlide ); - startEmbeddedContent( currentSlide ); - } - - // Announce the current slide contents, for screen readers - dom.statusDiv.textContent = getStatusText( currentSlide ); - - updateControls(); - updateProgress(); - updateBackground(); - updateParallax(); - updateSlideNumber(); - updateNotes(); - - // Update the URL hash - writeURL(); - - cueAutoSlide(); - - } - - /** - * Syncs the presentation with the current DOM. Useful - * when new slides or control elements are added or when - * the configuration has changed. - */ - function sync() { - - // Subscribe to input - removeEventListeners(); - addEventListeners(); - - // Force a layout to make sure the current config is accounted for - layout(); - - // Reflect the current autoSlide value - autoSlide = config.autoSlide; - - // Start auto-sliding if it's enabled - cueAutoSlide(); - - // Re-create the slide backgrounds - createBackgrounds(); - - // Write the current hash to the URL - writeURL(); - - sortAllFragments(); - - updateControls(); - updateProgress(); - updateSlideNumber(); - updateSlidesVisibility(); - updateBackground( true ); - updateNotes(); - - formatEmbeddedContent(); - - // Start or stop embedded content depending on global config - if( config.autoPlayMedia === false ) { - stopEmbeddedContent( currentSlide ); - } - else { - startEmbeddedContent( currentSlide ); - } - - if( isOverview() ) { - layoutOverview(); - } - - } - - /** - * Resets all vertical slides so that only the first - * is visible. - */ - function resetVerticalSlides() { - - var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); - horizontalSlides.forEach( function( horizontalSlide ) { - - var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); - verticalSlides.forEach( function( verticalSlide, y ) { - - if( y > 0 ) { - verticalSlide.classList.remove( 'present' ); - verticalSlide.classList.remove( 'past' ); - verticalSlide.classList.add( 'future' ); - verticalSlide.setAttribute( 'aria-hidden', 'true' ); - } - - } ); - - } ); - - } - - /** - * Sorts and formats all of fragments in the - * presentation. - */ - function sortAllFragments() { - - var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); - horizontalSlides.forEach( function( horizontalSlide ) { - - var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); - verticalSlides.forEach( function( verticalSlide, y ) { - - sortFragments( verticalSlide.querySelectorAll( '.fragment' ) ); - - } ); - - if( verticalSlides.length === 0 ) sortFragments( horizontalSlide.querySelectorAll( '.fragment' ) ); - - } ); - - } - - /** - * Randomly shuffles all slides in the deck. - */ - function shuffle() { - - var slides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); - - slides.forEach( function( slide ) { - - // Insert this slide next to another random slide. This may - // cause the slide to insert before itself but that's fine. - dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] ); - - } ); - - } - - /** - * Updates one dimension of slides by showing the slide - * with the specified index. - * - * @param {string} selector A CSS selector that will fetch - * the group of slides we are working with - * @param {number} index The index of the slide that should be - * shown - * - * @return {number} The index of the slide that is now shown, - * might differ from the passed in index if it was out of - * bounds. - */ - function updateSlides( selector, index ) { - - // Select all slides and convert the NodeList result to - // an array - var slides = toArray( dom.wrapper.querySelectorAll( selector ) ), - slidesLength = slides.length; - - var printMode = isPrintingPDF(); - - if( slidesLength ) { - - // Should the index loop? - if( config.loop ) { - index %= slidesLength; - - if( index < 0 ) { - index = slidesLength + index; - } - } - - // Enforce max and minimum index bounds - index = Math.max( Math.min( index, slidesLength - 1 ), 0 ); - - for( var i = 0; i < slidesLength; i++ ) { - var element = slides[i]; - - var reverse = config.rtl && !isVerticalSlide( element ); - - element.classList.remove( 'past' ); - element.classList.remove( 'present' ); - element.classList.remove( 'future' ); - - // http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute - element.setAttribute( 'hidden', '' ); - element.setAttribute( 'aria-hidden', 'true' ); - - // If this element contains vertical slides - if( element.querySelector( 'section' ) ) { - element.classList.add( 'stack' ); - } - - // If we're printing static slides, all slides are "present" - if( printMode ) { - element.classList.add( 'present' ); - continue; - } - - if( i < index ) { - // Any element previous to index is given the 'past' class - element.classList.add( reverse ? 'future' : 'past' ); - - if( config.fragments ) { - var pastFragments = toArray( element.querySelectorAll( '.fragment' ) ); - - // Show all fragments on prior slides - while( pastFragments.length ) { - var pastFragment = pastFragments.pop(); - pastFragment.classList.add( 'visible' ); - pastFragment.classList.remove( 'current-fragment' ); - } - } - } - else if( i > index ) { - // Any element subsequent to index is given the 'future' class - element.classList.add( reverse ? 'past' : 'future' ); - - if( config.fragments ) { - var futureFragments = toArray( element.querySelectorAll( '.fragment.visible' ) ); - - // No fragments in future slides should be visible ahead of time - while( futureFragments.length ) { - var futureFragment = futureFragments.pop(); - futureFragment.classList.remove( 'visible' ); - futureFragment.classList.remove( 'current-fragment' ); - } - } - } - } - - // Mark the current slide as present - slides[index].classList.add( 'present' ); - slides[index].removeAttribute( 'hidden' ); - slides[index].removeAttribute( 'aria-hidden' ); - - // If this slide has a state associated with it, add it - // onto the current state of the deck - var slideState = slides[index].getAttribute( 'data-state' ); - if( slideState ) { - state = state.concat( slideState.split( ' ' ) ); - } - - } - else { - // Since there are no slides we can't be anywhere beyond the - // zeroth index - index = 0; - } - - return index; - - } - - /** - * Optimization method; hide all slides that are far away - * from the present slide. - */ - function updateSlidesVisibility() { - - // Select all slides and convert the NodeList result to - // an array - var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ), - horizontalSlidesLength = horizontalSlides.length, - distanceX, - distanceY; - - if( horizontalSlidesLength && typeof indexh !== 'undefined' ) { - - // The number of steps away from the present slide that will - // be visible - var viewDistance = isOverview() ? 10 : config.viewDistance; - - // Limit view distance on weaker devices - if( isMobileDevice ) { - viewDistance = isOverview() ? 6 : 2; - } - - // All slides need to be visible when exporting to PDF - if( isPrintingPDF() ) { - viewDistance = Number.MAX_VALUE; - } - - for( var x = 0; x < horizontalSlidesLength; x++ ) { - var horizontalSlide = horizontalSlides[x]; - - var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ), - verticalSlidesLength = verticalSlides.length; - - // Determine how far away this slide is from the present - distanceX = Math.abs( ( indexh || 0 ) - x ) || 0; - - // If the presentation is looped, distance should measure - // 1 between the first and last slides - if( config.loop ) { - distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0; - } - - // Show the horizontal slide if it's within the view distance - if( distanceX < viewDistance ) { - showSlide( horizontalSlide ); - } - else { - hideSlide( horizontalSlide ); - } - - if( verticalSlidesLength ) { - - var oy = getPreviousVerticalIndex( horizontalSlide ); - - for( var y = 0; y < verticalSlidesLength; y++ ) { - var verticalSlide = verticalSlides[y]; - - distanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy ); - - if( distanceX + distanceY < viewDistance ) { - showSlide( verticalSlide ); - } - else { - hideSlide( verticalSlide ); - } - } - - } - } - - } - - } - - /** - * Pick up notes from the current slide and display them - * to the viewer. - * - * @see {@link config.showNotes} - */ - function updateNotes() { - - if( config.showNotes && dom.speakerNotes && currentSlide && !isPrintingPDF() ) { - - dom.speakerNotes.innerHTML = getSlideNotes() || ''; - - } - - } - - /** - * Updates the progress bar to reflect the current slide. - */ - function updateProgress() { - - // Update progress if enabled - if( config.progress && dom.progressbar ) { - - dom.progressbar.style.width = getProgress() * dom.wrapper.offsetWidth + 'px'; - - } - - } - - /** - * Updates the slide number div to reflect the current slide. - * - * The following slide number formats are available: - * "h.v": horizontal . vertical slide number (default) - * "h/v": horizontal / vertical slide number - * "c": flattened slide number - * "c/t": flattened slide number / total slides - */ - function updateSlideNumber() { - - // Update slide number if enabled - if( config.slideNumber && dom.slideNumber ) { - - var value = []; - var format = 'h.v'; - - // Check if a custom number format is available - if( typeof config.slideNumber === 'string' ) { - format = config.slideNumber; - } - - switch( format ) { - case 'c': - value.push( getSlidePastCount() + 1 ); - break; - case 'c/t': - value.push( getSlidePastCount() + 1, '/', getTotalSlides() ); - break; - case 'h/v': - value.push( indexh + 1 ); - if( isVerticalSlide() ) value.push( '/', indexv + 1 ); - break; - default: - value.push( indexh + 1 ); - if( isVerticalSlide() ) value.push( '.', indexv + 1 ); - } - - dom.slideNumber.innerHTML = formatSlideNumber( value[0], value[1], value[2] ); - } - - } - - /** - * Applies HTML formatting to a slide number before it's - * written to the DOM. - * - * @param {number} a Current slide - * @param {string} delimiter Character to separate slide numbers - * @param {(number|*)} b Total slides - * @return {string} HTML string fragment - */ - function formatSlideNumber( a, delimiter, b ) { - - if( typeof b === 'number' && !isNaN( b ) ) { - return ''+ a +'' + - ''+ delimiter +'' + - ''+ b +''; - } - else { - return ''+ a +''; - } - - } - - /** - * Updates the state of all control/navigation arrows. - */ - function updateControls() { - - var routes = availableRoutes(); - var fragments = availableFragments(); - - // Remove the 'enabled' class from all directions - dom.controlsLeft.concat( dom.controlsRight ) - .concat( dom.controlsUp ) - .concat( dom.controlsDown ) - .concat( dom.controlsPrev ) - .concat( dom.controlsNext ).forEach( function( node ) { - node.classList.remove( 'enabled' ); - node.classList.remove( 'fragmented' ); - - // Set 'disabled' attribute on all directions - node.setAttribute( 'disabled', 'disabled' ); - } ); - - // Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons - if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); - - // Prev/next buttons - if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } ); - - // Highlight fragment directions - if( currentSlide ) { - - // Always apply fragment decorator to prev/next buttons - if( fragments.prev ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); - - // Apply fragment decorators to directional buttons based on - // what slide axis they are in - if( isVerticalSlide( currentSlide ) ) { - if( fragments.prev ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); - } - else { - if( fragments.prev ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); - if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } ); - } - - } - - } - - /** - * Updates the background elements to reflect the current - * slide. - * - * @param {boolean} includeAll If true, the backgrounds of - * all vertical slides (not just the present) will be updated. - */ - function updateBackground( includeAll ) { - - var currentBackground = null; - - // Reverse past/future classes when in RTL mode - var horizontalPast = config.rtl ? 'future' : 'past', - horizontalFuture = config.rtl ? 'past' : 'future'; - - // Update the classes of all backgrounds to match the - // states of their slides (past/present/future) - toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) { - - backgroundh.classList.remove( 'past' ); - backgroundh.classList.remove( 'present' ); - backgroundh.classList.remove( 'future' ); - - if( h < indexh ) { - backgroundh.classList.add( horizontalPast ); - } - else if ( h > indexh ) { - backgroundh.classList.add( horizontalFuture ); - } - else { - backgroundh.classList.add( 'present' ); - - // Store a reference to the current background element - currentBackground = backgroundh; - } - - if( includeAll || h === indexh ) { - toArray( backgroundh.querySelectorAll( '.slide-background' ) ).forEach( function( backgroundv, v ) { - - backgroundv.classList.remove( 'past' ); - backgroundv.classList.remove( 'present' ); - backgroundv.classList.remove( 'future' ); - - if( v < indexv ) { - backgroundv.classList.add( 'past' ); - } - else if ( v > indexv ) { - backgroundv.classList.add( 'future' ); - } - else { - backgroundv.classList.add( 'present' ); - - // Only if this is the present horizontal and vertical slide - if( h === indexh ) currentBackground = backgroundv; - } - - } ); - } - - } ); - - // Stop content inside of previous backgrounds - if( previousBackground ) { - - stopEmbeddedContent( previousBackground ); - - } - - // Start content in the current background - if( currentBackground ) { - - startEmbeddedContent( currentBackground ); - - var backgroundImageURL = currentBackground.style.backgroundImage || ''; - - // Restart GIFs (doesn't work in Firefox) - if( /\.gif/i.test( backgroundImageURL ) ) { - currentBackground.style.backgroundImage = ''; - window.getComputedStyle( currentBackground ).opacity; - currentBackground.style.backgroundImage = backgroundImageURL; - } - - // Don't transition between identical backgrounds. This - // prevents unwanted flicker. - var previousBackgroundHash = previousBackground ? previousBackground.getAttribute( 'data-background-hash' ) : null; - var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' ); - if( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== previousBackground ) { - dom.background.classList.add( 'no-transition' ); - } - - previousBackground = currentBackground; - - } - - // If there's a background brightness flag for this slide, - // bubble it to the .reveal container - if( currentSlide ) { - [ 'has-light-background', 'has-dark-background' ].forEach( function( classToBubble ) { - if( currentSlide.classList.contains( classToBubble ) ) { - dom.wrapper.classList.add( classToBubble ); - } - else { - dom.wrapper.classList.remove( classToBubble ); - } - } ); - } - - // Allow the first background to apply without transition - setTimeout( function() { - dom.background.classList.remove( 'no-transition' ); - }, 1 ); - - } - - /** - * Updates the position of the parallax background based - * on the current slide index. - */ - function updateParallax() { - - if( config.parallaxBackgroundImage ) { - - var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ), - verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR ); - - var backgroundSize = dom.background.style.backgroundSize.split( ' ' ), - backgroundWidth, backgroundHeight; - - if( backgroundSize.length === 1 ) { - backgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 ); - } - else { - backgroundWidth = parseInt( backgroundSize[0], 10 ); - backgroundHeight = parseInt( backgroundSize[1], 10 ); - } - - var slideWidth = dom.background.offsetWidth, - horizontalSlideCount = horizontalSlides.length, - horizontalOffsetMultiplier, - horizontalOffset; - - if( typeof config.parallaxBackgroundHorizontal === 'number' ) { - horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal; - } - else { - horizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0; - } - - horizontalOffset = horizontalOffsetMultiplier * indexh * -1; - - var slideHeight = dom.background.offsetHeight, - verticalSlideCount = verticalSlides.length, - verticalOffsetMultiplier, - verticalOffset; - - if( typeof config.parallaxBackgroundVertical === 'number' ) { - verticalOffsetMultiplier = config.parallaxBackgroundVertical; - } - else { - verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ); - } - - verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv : 0; - - dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px'; - - } - - } - - /** - * Called when the given slide is within the configured view - * distance. Shows the slide element and loads any content - * that is set to load lazily (data-src). - * - * @param {HTMLElement} slide Slide to show - */ - /** - * Called when the given slide is within the configured view - * distance. Shows the slide element and loads any content - * that is set to load lazily (data-src). - * - * @param {HTMLElement} slide Slide to show - */ - function showSlide( slide ) { - - // Show the slide element - slide.style.display = config.display; - - // Media elements with data-src attributes - toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src]' ) ).forEach( function( element ) { - element.setAttribute( 'src', element.getAttribute( 'data-src' ) ); - element.removeAttribute( 'data-src' ); - } ); - - // Media elements with children - toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( media ) { - var sources = 0; - - toArray( media.querySelectorAll( 'source[data-src]' ) ).forEach( function( source ) { - source.setAttribute( 'src', source.getAttribute( 'data-src' ) ); - source.removeAttribute( 'data-src' ); - sources += 1; - } ); - - // If we rewrote sources for this video/audio element, we need - // to manually tell it to load from its new origin - if( sources > 0 ) { - media.load(); - } - } ); - - - // Show the corresponding background element - var indices = getIndices( slide ); - var background = getSlideBackground( indices.h, indices.v ); - if( background ) { - background.style.display = 'block'; - - // If the background contains media, load it - if( background.hasAttribute( 'data-loaded' ) === false ) { - background.setAttribute( 'data-loaded', 'true' ); - - var backgroundImage = slide.getAttribute( 'data-background-image' ), - backgroundVideo = slide.getAttribute( 'data-background-video' ), - backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ), - backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ), - backgroundIframe = slide.getAttribute( 'data-background-iframe' ); - - // Images - if( backgroundImage ) { - background.style.backgroundImage = 'url('+ backgroundImage +')'; - } - // Videos - else if ( backgroundVideo && !isSpeakerNotes() ) { - var video = document.createElement( 'video' ); - - if( backgroundVideoLoop ) { - video.setAttribute( 'loop', '' ); - } - - if( backgroundVideoMuted ) { - video.muted = true; - } - - // Inline video playback works (at least in Mobile Safari) as - // long as the video is muted and the `playsinline` attribute is - // present - if( isMobileDevice ) { - video.muted = true; - video.autoplay = true; - video.setAttribute( 'playsinline', '' ); - } - - // Support comma separated lists of video sources - backgroundVideo.split( ',' ).forEach( function( source ) { - video.innerHTML += ''; - } ); - - background.appendChild( video ); - } - // Iframes - else if( backgroundIframe ) { - var iframe = document.createElement( 'iframe' ); - iframe.setAttribute( 'allowfullscreen', '' ); - iframe.setAttribute( 'mozallowfullscreen', '' ); - iframe.setAttribute( 'webkitallowfullscreen', '' ); - - // Only load autoplaying content when the slide is shown to - // avoid having it play in the background - if( /autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) { - iframe.setAttribute( 'data-src', backgroundIframe ); - } - else { - iframe.setAttribute( 'src', backgroundIframe ); - } - - iframe.style.width = '100%'; - iframe.style.height = '100%'; - iframe.style.maxHeight = '100%'; - iframe.style.maxWidth = '100%'; - - background.appendChild( iframe ); - } - } - - } - - } - - /** - * Called when the given slide is moved outside of the - * configured view distance. - * - * @param {HTMLElement} slide - */ - function hideSlide( slide ) { - - // Hide the slide element - slide.style.display = 'none'; - - // Hide the corresponding background element - var indices = getIndices( slide ); - var background = getSlideBackground( indices.h, indices.v ); - if( background ) { - background.style.display = 'none'; - } - - } - - /** - * Determine what available routes there are for navigation. - * - * @return {{left: boolean, right: boolean, up: boolean, down: boolean}} - */ - function availableRoutes() { - - var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ), - verticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR ); - - var routes = { - left: indexh > 0 || config.loop, - right: indexh < horizontalSlides.length - 1 || config.loop, - up: indexv > 0, - down: indexv < verticalSlides.length - 1 - }; - - // reverse horizontal controls for rtl - if( config.rtl ) { - var left = routes.left; - routes.left = routes.right; - routes.right = left; - } - - return routes; - - } - - /** - * Returns an object describing the available fragment - * directions. - * - * @return {{prev: boolean, next: boolean}} - */ - function availableFragments() { - - if( currentSlide && config.fragments ) { - var fragments = currentSlide.querySelectorAll( '.fragment' ); - var hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.visible)' ); - - return { - prev: fragments.length - hiddenFragments.length > 0, - next: !!hiddenFragments.length - }; - } - else { - return { prev: false, next: false }; - } - - } - - /** - * Enforces origin-specific format rules for embedded media. - */ - function formatEmbeddedContent() { - - var _appendParamToIframeSource = function( sourceAttribute, sourceURL, param ) { - toArray( dom.slides.querySelectorAll( 'iframe['+ sourceAttribute +'*="'+ sourceURL +'"]' ) ).forEach( function( el ) { - var src = el.getAttribute( sourceAttribute ); - if( src && src.indexOf( param ) === -1 ) { - el.setAttribute( sourceAttribute, src + ( !/\?/.test( src ) ? '?' : '&' ) + param ); - } - }); - }; - - // YouTube frames must include "?enablejsapi=1" - _appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' ); - _appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' ); - - // Vimeo frames must include "?api=1" - _appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' ); - _appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' ); - - } - - /** - * Start playback of any embedded content inside of - * the given element. - * - * @param {HTMLElement} element - */ - function startEmbeddedContent( element ) { - - if( element && !isSpeakerNotes() ) { - - // Restart GIFs - toArray( element.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) { - // Setting the same unchanged source like this was confirmed - // to work in Chrome, FF & Safari - el.setAttribute( 'src', el.getAttribute( 'src' ) ); - } ); - - // HTML5 media elements - toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { - if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) { - return; - } - - // Prefer an explicit global autoplay setting - var autoplay = config.autoPlayMedia; - - // If no global setting is available, fall back on the element's - // own autoplay setting - if( typeof autoplay !== 'boolean' ) { - autoplay = el.hasAttribute( 'data-autoplay' ) || !!closestParent( el, '.slide-background' ); - } - - if( autoplay && typeof el.play === 'function' ) { - - if( el.readyState > 1 ) { - startEmbeddedMedia( { target: el } ); - } - else { - el.removeEventListener( 'loadeddata', startEmbeddedMedia ); // remove first to avoid dupes - el.addEventListener( 'loadeddata', startEmbeddedMedia ); - } - - } - } ); - - // Normal iframes - toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) { - if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) { - return; - } - - startEmbeddedIframe( { target: el } ); - } ); - - // Lazy loading iframes - toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) { - if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) { - return; - } - - if( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) { - el.removeEventListener( 'load', startEmbeddedIframe ); // remove first to avoid dupes - el.addEventListener( 'load', startEmbeddedIframe ); - el.setAttribute( 'src', el.getAttribute( 'data-src' ) ); - } - } ); - - } - - } - - /** - * Starts playing an embedded video/audio element after - * it has finished loading. - * - * @param {object} event - */ - function startEmbeddedMedia( event ) { - - var isAttachedToDOM = !!closestParent( event.target, 'html' ), - isVisible = !!closestParent( event.target, '.present' ); - - if( isAttachedToDOM && isVisible ) { - event.target.currentTime = 0; - event.target.play(); - } - - event.target.removeEventListener( 'loadeddata', startEmbeddedMedia ); - - } - - /** - * "Starts" the content of an embedded iframe using the - * postMessage API. - * - * @param {object} event - */ - function startEmbeddedIframe( event ) { - - var iframe = event.target; - - if( iframe && iframe.contentWindow ) { - - var isAttachedToDOM = !!closestParent( event.target, 'html' ), - isVisible = !!closestParent( event.target, '.present' ); - - if( isAttachedToDOM && isVisible ) { - - // Prefer an explicit global autoplay setting - var autoplay = config.autoPlayMedia; - - // If no global setting is available, fall back on the element's - // own autoplay setting - if( typeof autoplay !== 'boolean' ) { - autoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closestParent( iframe, '.slide-background' ); - } - - // YouTube postMessage API - if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) { - iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' ); - } - // Vimeo postMessage API - else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) { - iframe.contentWindow.postMessage( '{"method":"play"}', '*' ); - } - // Generic postMessage API - else { - iframe.contentWindow.postMessage( 'slide:start', '*' ); - } - - } - - } - - } - - /** - * Stop playback of any embedded content inside of - * the targeted slide. - * - * @param {HTMLElement} element - */ - function stopEmbeddedContent( element ) { - - if( element && element.parentNode ) { - // HTML5 media elements - toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { - if( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) { - el.setAttribute('data-paused-by-reveal', ''); - el.pause(); - } - } ); - - // Generic postMessage API for non-lazy loaded iframes - toArray( element.querySelectorAll( 'iframe' ) ).forEach( function( el ) { - if( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' ); - el.removeEventListener( 'load', startEmbeddedIframe ); - }); - - // YouTube postMessage API - toArray( element.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) { - if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) { - el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' ); - } - }); - - // Vimeo postMessage API - toArray( element.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) { - if( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) { - el.contentWindow.postMessage( '{"method":"pause"}', '*' ); - } - }); - - // Lazy loading iframes - toArray( element.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) { - // Only removing the src doesn't actually unload the frame - // in all browsers (Firefox) so we set it to blank first - el.setAttribute( 'src', 'about:blank' ); - el.removeAttribute( 'src' ); - } ); - } - - } - - /** - * Returns the number of past slides. This can be used as a global - * flattened index for slides. - * - * @return {number} Past slide count - */ - function getSlidePastCount() { - - var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); - - // The number of past slides - var pastCount = 0; - - // Step through all slides and count the past ones - mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) { - - var horizontalSlide = horizontalSlides[i]; - var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ); - - for( var j = 0; j < verticalSlides.length; j++ ) { - - // Stop as soon as we arrive at the present - if( verticalSlides[j].classList.contains( 'present' ) ) { - break mainLoop; - } - - pastCount++; - - } - - // Stop as soon as we arrive at the present - if( horizontalSlide.classList.contains( 'present' ) ) { - break; - } - - // Don't count the wrapping section for vertical slides - if( horizontalSlide.classList.contains( 'stack' ) === false ) { - pastCount++; - } - - } - - return pastCount; - - } - - /** - * Returns a value ranging from 0-1 that represents - * how far into the presentation we have navigated. - * - * @return {number} - */ - function getProgress() { - - // The number of past and total slides - var totalCount = getTotalSlides(); - var pastCount = getSlidePastCount(); - - if( currentSlide ) { - - var allFragments = currentSlide.querySelectorAll( '.fragment' ); - - // If there are fragments in the current slide those should be - // accounted for in the progress. - if( allFragments.length > 0 ) { - var visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' ); - - // This value represents how big a portion of the slide progress - // that is made up by its fragments (0-1) - var fragmentWeight = 0.9; - - // Add fragment progress to the past slide count - pastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight; - } - - } - - return pastCount / ( totalCount - 1 ); - - } - - /** - * Checks if this presentation is running inside of the - * speaker notes window. - * - * @return {boolean} - */ - function isSpeakerNotes() { - - return !!window.location.search.match( /receiver/gi ); - - } - - /** - * Reads the current URL (hash) and navigates accordingly. - */ - function readURL() { - - var hash = window.location.hash; - - // Attempt to parse the hash as either an index or name - var bits = hash.slice( 2 ).split( '/' ), - name = hash.replace( /#|\//gi, '' ); - - // If the first bit is invalid and there is a name we can - // assume that this is a named link - if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) { - var element; - - // Ensure the named link is a valid HTML ID attribute - if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) { - // Find the slide with the specified ID - element = document.getElementById( name ); - } - - if( element ) { - // Find the position of the named slide and navigate to it - var indices = Reveal.getIndices( element ); - slide( indices.h, indices.v ); - } - // If the slide doesn't exist, navigate to the current slide - else { - slide( indexh || 0, indexv || 0 ); - } - } - else { - // Read the index components of the hash - var h = parseInt( bits[0], 10 ) || 0, - v = parseInt( bits[1], 10 ) || 0; - - if( h !== indexh || v !== indexv ) { - slide( h, v ); - } - } - - } - - /** - * Updates the page URL (hash) to reflect the current - * state. - * - * @param {number} delay The time in ms to wait before - * writing the hash - */ - function writeURL( delay ) { - - if( config.history ) { - - // Make sure there's never more than one timeout running - clearTimeout( writeURLTimeout ); - - // If a delay is specified, timeout this call - if( typeof delay === 'number' ) { - writeURLTimeout = setTimeout( writeURL, delay ); - } - else if( currentSlide ) { - var url = '/'; - - // Attempt to create a named link based on the slide's ID - var id = currentSlide.getAttribute( 'id' ); - if( id ) { - id = id.replace( /[^a-zA-Z0-9\-\_\:\.]/g, '' ); - } - - // If the current slide has an ID, use that as a named link - if( typeof id === 'string' && id.length ) { - url = '/' + id; - } - // Otherwise use the /h/v index - else { - if( indexh > 0 || indexv > 0 ) url += indexh; - if( indexv > 0 ) url += '/' + indexv; - } - - window.location.hash = url; - } - } - - } - /** - * Retrieves the h/v location and fragment of the current, - * or specified, slide. - * - * @param {HTMLElement} [slide] If specified, the returned - * index will be for this slide rather than the currently - * active one - * - * @return {{h: number, v: number, f: number}} - */ - function getIndices( slide ) { - - // By default, return the current indices - var h = indexh, - v = indexv, - f; - - // If a slide is specified, return the indices of that slide - if( slide ) { - var isVertical = isVerticalSlide( slide ); - var slideh = isVertical ? slide.parentNode : slide; - - // Select all horizontal slides - var horizontalSlides = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ); - - // Now that we know which the horizontal slide is, get its index - h = Math.max( horizontalSlides.indexOf( slideh ), 0 ); - - // Assume we're not vertical - v = undefined; - - // If this is a vertical slide, grab the vertical index - if( isVertical ) { - v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 ); - } - } - - if( !slide && currentSlide ) { - var hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0; - if( hasFragments ) { - var currentFragment = currentSlide.querySelector( '.current-fragment' ); - if( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) { - f = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 ); - } - else { - f = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1; - } - } - } - - return { h: h, v: v, f: f }; - - } - - /** - * Retrieves all slides in this presentation. - */ - function getSlides() { - - return toArray( dom.wrapper.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' )); - - } - - /** - * Retrieves the total number of slides in this presentation. - * - * @return {number} - */ - function getTotalSlides() { - - return getSlides().length; - - } - - /** - * Returns the slide element matching the specified index. - * - * @return {HTMLElement} - */ - function getSlide( x, y ) { - - var horizontalSlide = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ]; - var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' ); - - if( verticalSlides && verticalSlides.length && typeof y === 'number' ) { - return verticalSlides ? verticalSlides[ y ] : undefined; - } - - return horizontalSlide; - - } - - /** - * Returns the background element for the given slide. - * All slides, even the ones with no background properties - * defined, have a background element so as long as the - * index is valid an element will be returned. - * - * @param {number} x Horizontal background index - * @param {number} y Vertical background index - * @return {(HTMLElement[]|*)} - */ - function getSlideBackground( x, y ) { - - // When printing to PDF the slide backgrounds are nested - // inside of the slides - if( isPrintingPDF() ) { - var slide = getSlide( x, y ); - if( slide ) { - return slide.slideBackgroundElement; - } - - return undefined; - } - - var horizontalBackground = dom.wrapper.querySelectorAll( '.backgrounds>.slide-background' )[ x ]; - var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' ); - - if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) { - return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined; - } - - return horizontalBackground; - - } - - /** - * Retrieves the speaker notes from a slide. Notes can be - * defined in two ways: - * 1. As a data-notes attribute on the slide
- * 2. As an