diff options
Diffstat (limited to 'js')
| -rw-r--r-- | js/reveal.js | 335 |
1 files changed, 260 insertions, 75 deletions
diff --git a/js/reveal.js b/js/reveal.js index 915f8bb..97e61cf 100644 --- a/js/reveal.js +++ b/js/reveal.js @@ -136,6 +136,10 @@ // Parallax background size parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px" + // Amount of pixels to move the parallax background per slide step + parallaxBackgroundHorizontal: null, + parallaxBackgroundVertical: null, + // Number of slides away from the current that are visible viewDistance: 3, @@ -147,6 +151,9 @@ // Flags if reveal.js is loaded (has dispatched the 'ready' event) loaded = false, + // Flags if the overview mode is currently active + overview = false, + // The horizontal and vertical index of the currently active slide indexh, indexv, @@ -165,6 +172,10 @@ // 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 = {}, @@ -293,7 +304,11 @@ features.touch = !!( 'ontouchstart' in window ); - isMobileDevice = navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi ); + // Transitions in the overview are disabled in desktop and + // mobile Safari due to lag + features.overviewTransitions = !/Version\/[\d\.]+.*Safari/.test( navigator.userAgent ); + + isMobileDevice = /(iphone|ipod|ipad|android)/gi.test( navigator.userAgent ); } @@ -373,6 +388,9 @@ // Listen to messages posted to this window setupPostMessage(); + // Prevent iframes from scrolling the slides out of view + setupIframeScrollPrevention(); + // Resets all vertical slides so that only the first is visible resetVerticalSlides(); @@ -557,6 +575,26 @@ } /** + * This is an unfortunate necessity. Iframes can trigger the + * parent window to scroll, for example by focusing an input. + * This scrolling can not be prevented by hiding overflow in + * CSS so we have to resort to repeatedly checking if the + * browser has decided to offset our slides :( + */ + function setupIframeScrollPrevention() { + + if( dom.slides.querySelector( 'iframe' ) ) { + setInterval( function() { + if( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) { + dom.wrapper.scrollTop = 0; + dom.wrapper.scrollLeft = 0; + } + }, 500 ); + } + + } + + /** * Creates an HTML element and returns a reference to it. * If the element already exists the existing instance will * be returned. @@ -757,7 +795,7 @@ var data = event.data; // Make sure we're dealing with JSON - if( data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) { + if( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) { data = JSON.parse( data ); // Check if the requested method can be found @@ -1051,12 +1089,32 @@ element.style.WebkitTransform = transform; element.style.MozTransform = transform; element.style.msTransform = transform; - element.style.OTransform = transform; element.style.transform = transform; } /** + * Applies CSS transforms to the slides container. The container + * is transformed from two separate sources: layout and the overview + * mode. + */ + function transformSlides( transforms ) { + + // Pick up new transforms from arguments + if( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout; + if( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview; + + // Apply the transforms to the slides container + if( slidesTransform.layout ) { + transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview ); + } + else { + transformElement( dom.slides, slidesTransform.overview ); + } + + } + + /** * Injects the given CSS styles into the DOM. */ function injectStyleSheet( value ) { @@ -1465,12 +1523,13 @@ dom.slides.style.top = ''; dom.slides.style.bottom = ''; dom.slides.style.right = ''; - transformElement( dom.slides, '' ); + transformSlides( { layout: '' } ); } else { // Prefer zooming in desktop Chrome so that content remains crisp if( !isMobileDevice && /chrome/i.test( navigator.userAgent ) && typeof dom.slides.style.zoom !== 'undefined' ) { dom.slides.style.zoom = scale; + transformSlides( { layout: '' } ); } // Apply scale transform as a fallback else { @@ -1478,7 +1537,7 @@ dom.slides.style.top = '50%'; dom.slides.style.bottom = 'auto'; dom.slides.style.right = 'auto'; - transformElement( dom.slides, 'translate(-50%, -50%) scale('+ scale +')' ); + transformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } ); } } @@ -1620,82 +1679,122 @@ } /** - * Displays the overview of slides (quick nav) by - * scaling down and arranging all slide elements. - * - * Experimental feature, might be dropped if perf - * can't be improved. + * 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 ) { + 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(); - var wasActive = dom.wrapper.classList.contains( 'overview' ); + // Move the backgrounds element into the slide container to + // that the same scaling is applied + dom.slides.appendChild( dom.background ); - // Vary the depth of the overview based on screen size - var depth = window.innerWidth < 400 ? 1000 : 2500; + // 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 ); + } + } ); - dom.wrapper.classList.add( 'overview' ); - dom.wrapper.classList.remove( 'overview-deactivating' ); + updateSlidesVisibility(); + layoutOverview(); + updateOverview(); - var horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ); + layout(); - for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) { - var hslide = horizontalSlides[i], - hoffset = config.rtl ? -105 : 105; + // Notify observers of the overview showing + dispatchEvent( 'overviewshown', { + 'indexh': indexh, + 'indexv': indexv, + 'currentSlide': currentSlide + } ); - hslide.setAttribute( 'data-index-h', i ); + } - // Apply CSS transform - transformElement( hslide, 'translateZ(-'+ depth +'px) translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)' ); + } - if( hslide.classList.contains( 'stack' ) ) { + /** + * Uses CSS transforms to position all slides in a grid for + * display inside of the overview mode. + */ + function layoutOverview() { - var verticalSlides = hslide.querySelectorAll( 'section' ); + var margin = 70; + var slideWidth = config.width + margin, + slideHeight = config.height + margin; - for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) { - var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide ); + // Reverse in RTL mode + if( config.rtl ) { + slideWidth = -slideWidth; + } - var vslide = verticalSlides[j]; + // Layout slides + toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( hslide, h ) { + hslide.setAttribute( 'data-index-h', h ); + transformElement( hslide, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' ); - vslide.setAttribute( 'data-index-h', i ); - vslide.setAttribute( 'data-index-v', j ); + if( hslide.classList.contains( 'stack' ) ) { - // Apply CSS transform - transformElement( vslide, 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)' ); + toArray( hslide.querySelectorAll( 'section' ) ).forEach( function( vslide, v ) { + vslide.setAttribute( 'data-index-h', h ); + vslide.setAttribute( 'data-index-v', v ); - // Navigate to this slide on click - vslide.addEventListener( 'click', onOverviewSlideClicked, true ); - } + transformElement( vslide, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' ); + } ); - } - else { + } + } ); - // Navigate to this slide on click - hslide.addEventListener( 'click', onOverviewSlideClicked, true ); + // Layout slide backgrounds + toArray( dom.background.childNodes ).forEach( function( hbackground, h ) { + transformElement( hbackground, 'translate3d(' + ( h * slideWidth ) + 'px, 0, 0)' ); - } - } + toArray( hbackground.querySelectorAll( '.slide-background' ) ).forEach( function( vbackground, v ) { + transformElement( vbackground, 'translate3d(0, ' + ( v * slideHeight ) + 'px, 0)' ); + } ); + } ); - updateSlidesVisibility(); + } - layout(); + /** + * Moves the overview viewport to the current slides. + * Called each time the current slide changes. + */ + function updateOverview() { - if( !wasActive ) { - // Notify observers of the overview showing - dispatchEvent( 'overviewshown', { - 'indexh': indexh, - 'indexv': indexv, - 'currentSlide': currentSlide - } ); - } + var margin = 70; + var slideWidth = config.width + margin, + slideHeight = config.height + margin; + // Reverse in RTL mode + if( config.rtl ) { + slideWidth = -slideWidth; } + transformSlides( { + overview: [ + 'translateX('+ ( -indexh * slideWidth ) +'px)', + 'translateY('+ ( -indexv * slideHeight ) +'px)', + 'translateZ('+ ( window.innerWidth < 400 ? -1000 : -2500 ) +'px)' + ].join( ' ' ) + } ); + } /** @@ -1707,7 +1806,10 @@ // 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 @@ -1718,16 +1820,27 @@ dom.wrapper.classList.remove( 'overview-deactivating' ); }, 1 ); - // Select all slides + // 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 ) { - // Resets all transforms to use the external styles 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 @@ -1766,7 +1879,7 @@ */ function isOverview() { - return dom.wrapper.classList.contains( 'overview' ); + return overview; } @@ -1916,7 +2029,7 @@ // If no vertical index is specified and the upcoming slide is a // stack, resume at its previous vertical index - if( v === undefined ) { + if( v === undefined && !isOverview() ) { v = getPreviousVerticalIndex( horizontalSlides[ h ] ); } @@ -1966,9 +2079,9 @@ document.documentElement.classList.remove( stateBefore.pop() ); } - // If the overview is active, re-activate it to update positions + // Update the overview if it's currently active if( isOverview() ) { - activateOverview(); + updateOverview(); } // Find the current horizontal slide and any possible vertical slides @@ -2081,6 +2194,10 @@ formatEmbeddedContent(); + if( isOverview() ) { + layoutOverview(); + } + } /** @@ -2269,7 +2386,7 @@ viewDistance = isOverview() ? 6 : 2; } - // Limit view distance on weaker devices + // All slides need to be visible when exporting to PDF if( isPrintingPDF() ) { viewDistance = Number.MAX_VALUE; } @@ -2280,8 +2397,14 @@ var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ), verticalSlidesLength = verticalSlides.length; - // Loops so that it measures 1 between the first and last slides - distanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0; + // 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 ) { @@ -2331,19 +2454,33 @@ /** * Updates the slide number div to reflect the current slide. + * + * Slide number format can be defined as a string using the + * following variables: + * h: current slide's horizontal index + * v: current slide's vertical index + * c: current slide index (flattened) + * t: total number of slides (flattened) */ function updateSlideNumber() { // Update slide number if enabled if( config.slideNumber && dom.slideNumber) { - // Display the number of the page using 'indexh - indexv' format - var indexString = indexh; - if( indexv > 0 ) { - indexString += ' - ' + indexv; + // Default to only showing the current slide number + var format = 'c'; + + // Check if a custom slide number format is available + if( typeof config.slideNumber === 'string' ) { + format = config.slideNumber; } - dom.slideNumber.innerHTML = indexString; + var totalSlides = getTotalSlides(); + + dom.slideNumber.innerHTML = format.replace( /h/g, indexh ) + .replace( /v/g, indexv ) + .replace( /c/g, Math.round( getProgress() * totalSlides ) + 1 ) + .replace( /t/g, totalSlides + 1 ); } } @@ -2476,6 +2613,15 @@ currentVideo.play(); } + 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; @@ -2530,15 +2676,35 @@ backgroundHeight = parseInt( backgroundSize[1], 10 ); } - var slideWidth = dom.background.offsetWidth; - var horizontalSlideCount = horizontalSlides.length; - var horizontalOffset = -( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) * indexh; + var slideWidth = dom.background.offsetWidth, + horizontalSlideCount = horizontalSlides.length, + horizontalOffsetMultiplier, + horizontalOffset; + + if( typeof config.parallaxBackgroundHorizontal === 'number' ) { + horizontalOffsetMultiplier = config.parallaxBackgroundHorizontal; + } + else { + horizontalOffsetMultiplier = ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ); + } + + horizontalOffset = horizontalOffsetMultiplier * indexh * -1; - var slideHeight = dom.background.offsetHeight; - var verticalSlideCount = verticalSlides.length; - var verticalOffset = verticalSlideCount > 1 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0; + var slideHeight = dom.background.offsetHeight, + verticalSlideCount = verticalSlides.length, + verticalOffsetMultiplier, + verticalOffset; - dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px'; + if( typeof config.parallaxBackgroundVertical === 'number' ) { + verticalOffsetMultiplier = config.parallaxBackgroundVertical; + } + else { + verticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ); + } + + verticalOffset = verticalSlideCount > 0 ? verticalOffsetMultiplier * indexv * 1 : 0; + + dom.background.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px'; } @@ -2590,6 +2756,7 @@ var backgroundImage = slide.getAttribute( 'data-background-image' ), backgroundVideo = slide.getAttribute( 'data-background-video' ), + backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ), backgroundIframe = slide.getAttribute( 'data-background-iframe' ); // Images @@ -2600,6 +2767,10 @@ else if ( backgroundVideo && !isSpeakerNotes() ) { var video = document.createElement( 'video' ); + if( backgroundVideoLoop ) { + video.setAttribute( 'loop', '' ); + } + // Support comma separated lists of video sources backgroundVideo.split( ',' ).forEach( function( source ) { video.innerHTML += '<source src="'+ source +'">'; @@ -2608,7 +2779,7 @@ background.appendChild( video ); } // Iframes - else if ( backgroundIframe ) { + else if( backgroundIframe ) { var iframe = document.createElement( 'iframe' ); iframe.setAttribute( 'src', backgroundIframe ); iframe.style.width = '100%'; @@ -2722,6 +2893,13 @@ function startEmbeddedContent( slide ) { if( slide && !isSpeakerNotes() ) { + // Restart GIFs + toArray( slide.querySelectorAll( 'img[src$=".gif"]' ) ).forEach( function( el ) { + // Setting the same unchanged source like this was confirmed + // to work in Chrome, FF & Safari + el.setAttribute( 'src', el.getAttribute( 'src' ) ); + } ); + // HTML5 media elements toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) { if( el.hasAttribute( 'data-autoplay' ) ) { @@ -2880,7 +3058,7 @@ // Ensure the named link is a valid HTML ID attribute if( /^[a-zA-Z][\w:.-]*$/.test( name ) ) { // Find the slide with the specified ID - element = document.querySelector( '#' + name ); + element = document.getElementById( name ); } if( element ) { @@ -3828,6 +4006,10 @@ var slidesTotal = toArray( dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length; var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal ); + if( config.rtl ) { + slideIndex = slidesTotal - slideIndex; + } + slide( slideIndex ); } @@ -3872,7 +4054,10 @@ // If, after clicking a link or similar and we're coming back, // focus the document.body to ensure we can use keyboard shortcuts if( isHidden === false && document.activeElement !== document.body ) { - document.activeElement.blur(); + // Not all elements support .blur() - SVGs among them. + if( typeof document.activeElement.blur === 'function' ) { + document.activeElement.blur(); + } document.body.focus(); } |