diff options
Diffstat (limited to 'js/reveal.js')
| -rw-r--r-- | js/reveal.js | 274 |
1 files changed, 160 insertions, 114 deletions
diff --git a/js/reveal.js b/js/reveal.js index 4a47756..97f2994 100644 --- a/js/reveal.js +++ b/js/reveal.js @@ -43,11 +43,11 @@ height: 700, // Factor of the display size that should remain empty around the content - margin: 0.1, + margin: 0.04, // Bounds for smallest/largest possible scale to apply to content minScale: 0.2, - maxScale: 1.5, + maxScale: 2.0, // Display controls in the bottom right corner controls: true, @@ -153,6 +153,10 @@ 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, + // Number of slides away from the current that are visible viewDistance: 3, @@ -161,6 +165,9 @@ }, + // Flags if Reveal.initialize() has been called + initialized = false, + // Flags if reveal.js is loaded (has dispatched the 'ready' event) loaded = false, @@ -253,6 +260,11 @@ */ function initialize( options ) { + // Make sure we only initialize once + if( initialized === true ) return; + + initialized = true; + checkCapabilities(); if( !features.transforms2d && !features.transforms3d ) { @@ -442,6 +454,8 @@ loaded = true; + dom.wrapper.classList.add( 'ready' ); + dispatchEvent( 'ready', { 'indexh': indexh, 'indexv': indexv, @@ -495,13 +509,13 @@ // Element containing notes that are visible to the audience dom.speakerNotes = createSingletonNode( dom.wrapper, 'div', 'speaker-notes', null ); dom.speakerNotes.setAttribute( 'data-prevent-swipe', '' ); + dom.speakerNotes.setAttribute( 'tabindex', '0' ); // Overlay graphic which is displayed during the paused mode createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null ); // Cache references to elements dom.controls = document.querySelector( '.reveal .controls' ); - dom.theme = document.querySelector( '#theme' ); dom.wrapper.setAttribute( 'role', 'application' ); @@ -589,43 +603,61 @@ var left = ( pageWidth - slideWidth ) / 2, top = ( pageHeight - slideHeight ) / 2; - var contentHeight = getAbsoluteHeight( slide ); + var contentHeight = slide.scrollHeight; var numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 ); + // Adhere to configured pages per slide limit + numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide ); + // Center slides vertically if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) { top = Math.max( ( pageHeight - contentHeight ) / 2, 0 ); } + // Wrap the slide in a page element and hide its overflow + // so that no page ever flows onto another + var page = document.createElement( 'div' ); + page.className = 'pdf-page'; + page.style.height = ( pageHeight * numberOfPages ) + 'px'; + slide.parentNode.insertBefore( page, slide ); + page.appendChild( slide ); + // Position the slide inside of the page slide.style.left = left + 'px'; slide.style.top = top + 'px'; slide.style.width = slideWidth + 'px'; - // TODO Backgrounds need to be multiplied when the slide - // stretches over multiple pages - var background = slide.querySelector( '.slide-background' ); - if( background ) { - background.style.width = pageWidth + 'px'; - background.style.height = ( pageHeight * numberOfPages ) + 'px'; - background.style.top = -top + 'px'; - background.style.left = -left + 'px'; + if( slide.slideBackgroundElement ) { + page.insertBefore( slide.slideBackgroundElement, slide ); } // Inject notes if `showNotes` is enabled if( config.showNotes ) { + + // Are there notes for this slide? var notes = getSlideNotes( slide ); if( notes ) { + var notesSpacing = 8; + var notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline'; var notesElement = document.createElement( 'div' ); notesElement.classList.add( 'speaker-notes' ); notesElement.classList.add( 'speaker-notes-pdf' ); + notesElement.setAttribute( 'data-layout', notesLayout ); notesElement.innerHTML = notes; - notesElement.style.left = ( notesSpacing - left ) + 'px'; - notesElement.style.bottom = ( notesSpacing - top ) + 'px'; - notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px'; - slide.appendChild( notesElement ); + + if( notesLayout === 'separate-page' ) { + page.parentNode.insertBefore( notesElement, page.nextSibling ); + } + else { + notesElement.style.left = notesSpacing + 'px'; + notesElement.style.bottom = notesSpacing + 'px'; + notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px'; + page.appendChild( notesElement ); + } + } + } // Inject slide numbers if `slideNumbers` are enabled @@ -637,7 +669,7 @@ numberElement.classList.add( 'slide-number' ); numberElement.classList.add( 'slide-number-pdf' ); numberElement.innerHTML = formatSlideNumber( slideNumberH, '.', slideNumberV ); - background.appendChild( numberElement ); + page.appendChild( numberElement ); } } @@ -717,24 +749,12 @@ // Iterate over all horizontal slides toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) { - var backgroundStack; - - if( printMode ) { - backgroundStack = createBackground( slideh, slideh ); - } - else { - backgroundStack = createBackground( slideh, dom.background ); - } + var backgroundStack = createBackground( slideh, dom.background ); // Iterate over all vertical slides toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) { - if( printMode ) { - createBackground( slidev, slidev ); - } - else { - createBackground( slidev, backgroundStack ); - } + createBackground( slidev, backgroundStack ); backgroundStack.classList.add( 'stack' ); @@ -830,18 +850,20 @@ slide.classList.remove( 'has-dark-background' ); slide.classList.remove( 'has-light-background' ); + slide.slideBackgroundElement = element; + // If this slide has a background color, add a class that // signals if it is light or dark. If the slide has no background // color, no class will be set - var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor; - if( computedBackgroundColor ) { - var rgb = colorToRgb( computedBackgroundColor ); + var computedBackgroundStyle = window.getComputedStyle( element ); + if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) { + var rgb = colorToRgb( computedBackgroundStyle.backgroundColor ); // Ignore fully transparent backgrounds. Some browsers return // rgba(0,0,0,0) when reading the computed background color of // an element with no background if( rgb && rgb.a !== 0 ) { - if( colorBrightness( computedBackgroundColor ) < 128 ) { + if( colorBrightness( computedBackgroundStyle.backgroundColor ) < 128 ) { slide.classList.add( 'has-dark-background' ); } else { @@ -935,6 +957,7 @@ if( config.showNotes ) { dom.speakerNotes.classList.add( 'visible' ); + dom.speakerNotes.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' ); } else { dom.speakerNotes.classList.remove( 'visible' ); @@ -1220,6 +1243,42 @@ } /** + * Find the closest parent that matches the given + * selector. + * + * @param {HTMLElement} target The child element + * @param {String} selector The CSS selector to match + * the parents against + * + * @return {HTMLElement} The matched parent or null + * if no matching parent was found + */ + function closestParent( target, selector ) { + + var parent = target.parentNode; + + while( parent ) { + + // There's some overhead doing this each time, we don't + // want to rewrite the element prototype but should still + // be enough to feature detect once at startup... + var matchesMethod = parent.matches || parent.matchesSelector || parent.msMatchesSelector; + + // If we find a match, we're all set + if( matchesMethod && matchesMethod.call( parent, selector ) ) { + return parent; + } + + // Keep searching + parent = parent.parentNode; + + } + + return null; + + } + + /** * Converts various color input formats to an {r:0,g:0,b:0} object. * * @param {String} color The string representation of a color, @@ -1291,41 +1350,6 @@ } /** - * Retrieves the height of the given element by looking - * at the position and height of its immediate children. - */ - function getAbsoluteHeight( element ) { - - var height = 0; - - if( element ) { - var absoluteChildren = 0; - - toArray( element.childNodes ).forEach( function( child ) { - - if( typeof child.offsetTop === 'number' && child.style ) { - // Count # of abs children - if( window.getComputedStyle( child ).position === 'absolute' ) { - absoluteChildren += 1; - } - - height = Math.max( height, child.offsetTop + child.offsetHeight ); - } - - } ); - - // If there are no absolute children, use offsetHeight - if( absoluteChildren === 0 ) { - height = element.offsetHeight; - } - - } - - return height; - - } - - /** * Returns the remaining height within the parent of the * target element. * @@ -1589,10 +1613,8 @@ var size = getComputedSlideSize(); - var slidePadding = 20; // TODO Dig this out of DOM - // Layout the contents of the slides - layoutSlideContents( config.width, config.height, slidePadding ); + layoutSlideContents( config.width, config.height ); dom.slides.style.width = size.width + 'px'; dom.slides.style.height = size.height + 'px'; @@ -1654,7 +1676,7 @@ slide.style.top = 0; } else { - slide.style.top = Math.max( ( ( size.height - getAbsoluteHeight( slide ) ) / 2 ) - slidePadding, 0 ) + 'px'; + slide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px'; } } else { @@ -1674,7 +1696,7 @@ * Applies layout logic to the contents of all slides in * the presentation. */ - function layoutSlideContents( width, height, padding ) { + function layoutSlideContents( width, height ) { // Handle sizing of elements with the 'stretch' class toArray( dom.slides.querySelectorAll( 'section > .stretch' ) ).forEach( function( element ) { @@ -2652,34 +2674,37 @@ .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 - if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' ); } ); - if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } ); - if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' ); } ); - if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } ); + // 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' ); } ); - if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } ); + 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' ); } ); - if( fragments.next ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); + 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' ); } ); - if( fragments.next ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); + 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' ); } ); - if( fragments.next ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'fragmented', 'enabled' ); } ); + 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' ); } ); } } @@ -3057,32 +3082,44 @@ /** * Start playback of any embedded content inside of - * the targeted slide. + * the given element. */ - function startEmbeddedContent( slide ) { + function startEmbeddedContent( element ) { - if( slide && !isSpeakerNotes() ) { + if( element && !isSpeakerNotes() ) { // Restart GIFs - toArray( slide.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) { + toArray( element.querySelectorAll( 'img[src$=".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( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { + toArray( element.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { + if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) { + return; + } + if( el.hasAttribute( 'data-autoplay' ) && typeof el.play === 'function' ) { el.play(); } } ); // Normal iframes - toArray( slide.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) { + toArray( element.querySelectorAll( 'iframe[src]' ) ).forEach( function( el ) { + if( closestParent( el, '.fragment' ) && !closestParent( el, '.fragment.visible' ) ) { + return; + } + startEmbeddedIframe( { target: el } ); } ); // Lazy loading iframes - toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( el ) { + 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 ); @@ -3101,17 +3138,21 @@ var iframe = event.target; - // YouTube postMessage API - if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) { - iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' ); - } - // Vimeo postMessage API - else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) { - iframe.contentWindow.postMessage( '{"method":"play"}', '*' ); - } - // Generic postMessage API - else { - iframe.contentWindow.postMessage( 'slide:start', '*' ); + if( iframe && iframe.contentWindow ) { + + // YouTube postMessage API + if( /youtube\.com\/embed\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) { + iframe.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' ); + } + // Vimeo postMessage API + else if( /player\.vimeo\.com\//.test( iframe.getAttribute( 'src' ) ) && iframe.hasAttribute( 'data-autoplay' ) ) { + iframe.contentWindow.postMessage( '{"method":"play"}', '*' ); + } + // Generic postMessage API + else { + iframe.contentWindow.postMessage( 'slide:start', '*' ); + } + } } @@ -3427,10 +3468,7 @@ if( isPrintingPDF() ) { var slide = getSlide( x, y ); if( slide ) { - var background = slide.querySelector( '.slide-background' ); - if( background && background.parentNode === slide ) { - return background; - } + return slide.slideBackgroundElement; } return undefined; @@ -3632,6 +3670,7 @@ if( i === index ) { element.classList.add( 'current-fragment' ); + startEmbeddedContent( element ); } } // Hidden fragments @@ -3641,7 +3680,6 @@ element.classList.remove( 'current-fragment' ); } - } ); if( fragmentsHidden.length ) { @@ -3698,9 +3736,13 @@ if( currentSlide ) { - var currentFragment = currentSlide.querySelector( '.current-fragment' ); + var fragment = currentSlide.querySelector( '.current-fragment' ); - var fragmentAutoSlide = currentFragment ? currentFragment.getAttribute( 'data-autoslide' ) : null; + // When the slide first appears there is no "current" fragment so + // we look for a data-autoslide timing on the first fragment + if( !fragment ) fragment = currentSlide.querySelector( '.fragment' ); + + var fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null; var parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null; var slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' ); @@ -3963,10 +4005,11 @@ // the keyboard var activeElementIsCE = document.activeElement && document.activeElement.contentEditable !== 'inherit'; var activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName ); + var activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className); // Disregard the event if there's a focused element or a // keyboard modifier key is present - if( activeElementIsCE || activeElementIsInput || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return; + if( activeElementIsCE || activeElementIsInput || activeElementIsNotes || (event.shiftKey && event.keyCode !== 32) || event.altKey || event.ctrlKey || event.metaKey ) return; // While paused only allow resume keyboard events; 'b', 'v', '.' var resumeKeyCodes = [66,86,190,191]; @@ -4602,6 +4645,9 @@ navigatePrev: navigatePrev, navigateNext: navigateNext, + // Shows a help overlay with keyboard shortcuts + showHelp: showHelp, + // Forces an update in slide layout layout: layout, |