diff --git a/README.md b/README.md index 6625972e..03ec6353 100644 --- a/README.md +++ b/README.md @@ -108,6 +108,16 @@ Reveal.initialize({ // Transition style for full page backgrounds backgroundTransition: 'default' // default/linear/none + + // Parallax background image + parallaxBackgroundImage: '', // CSS syntax, e.g. "url('a.jpg')" + + // Parallax background size + parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px" + + // Number of slides away from the current that are visible + viewDistance: 3, + }); ``` @@ -291,6 +301,30 @@ Slides are contained within a limited portion of the screen by default to allow Backgrounds transition using a fade animation by default. This can be changed to a linear sliding transition by passing ```backgroundTransition: 'slide'``` to the ```Reveal.initialize()``` call. Alternatively you can set ```data-background-transition``` on any section with a background to override that specific transition. +### Parallax Background + +If you want to use the parallax scrolling background, set the two following config properties when initializing reveal.js (the third one is optional ) + +```javascript +Reveal.initialize({ + + // Parallax background image + parallaxBackgroundImage: '', // CSS syntax, e.g. "url('a.jpg')" + + // Parallax background size + parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px" - currently only pixels are supported (don't use % or auto) + + // This slide transition gives best results: + transition: linear + +}); +``` + +Make sure that the background size is much bigger than screen size to allow for some scrolling. + +The image used in the background is made by Eli Mergel and is published under Creative Commons license on [Flickr](https://secure.flickr.com/photos/sp1te/3436256585/sizes/o/in/pool-856427@N25/). + + ### Slide Transitions The global presentation transition is set using the ```transition``` config value. You can override the global transition for a specific slide by using the ```data-transition``` attribute: diff --git a/css/reveal.css b/css/reveal.css index a9b3888a..0b9d2e96 100644 --- a/css/reveal.css +++ b/css/reveal.css @@ -1402,6 +1402,30 @@ body { float: right } +/********************************************* + * PARALLAX BACKGROUND + *********************************************/ +.reveal[data-parallax-background] { + -webkit-transition: all 0.8s ease; + -moz-transition: all 0.8s ease; + -ms-transition: all 0.8s ease; + transition: all 0.8s ease; +} + +/* Global transition speed settings */ +.reveal[data-parallax-background][data-transition-speed="fast"] { + -webkit-transition-duration: 400ms; + -moz-transition-duration: 400ms; + -ms-transition-duration: 400ms; + transition-duration: 400ms; +} +.reveal[data-parallax-background][data-transition-speed="slow"] { + -webkit-transition-duration: 1200ms; + -moz-transition-duration: 1200ms; + -ms-transition-duration: 1200ms; + transition-duration: 1200ms; +} + /********************************************* * LINK PREVIEW OVERLAY diff --git a/css/reveal.min.css b/css/reveal.min.css index 8db36750..55f1ef2d 100644 --- a/css/reveal.min.css +++ b/css/reveal.min.css @@ -4,4 +4,4 @@ * MIT licensed * * Copyright (C) 2013 Hakim El Hattab, http://hakim.se - */ html,body,.reveal div,.reveal span,.reveal applet,.reveal object,.reveal iframe,.reveal h1,.reveal h2,.reveal h3,.reveal h4,.reveal h5,.reveal h6,.reveal p,.reveal blockquote,.reveal pre,.reveal a,.reveal abbr,.reveal acronym,.reveal address,.reveal big,.reveal cite,.reveal code,.reveal del,.reveal dfn,.reveal em,.reveal img,.reveal ins,.reveal kbd,.reveal q,.reveal s,.reveal samp,.reveal small,.reveal strike,.reveal strong,.reveal sub,.reveal sup,.reveal tt,.reveal var,.reveal b,.reveal u,.reveal i,.reveal center,.reveal dl,.reveal dt,.reveal dd,.reveal ol,.reveal ul,.reveal li,.reveal fieldset,.reveal form,.reveal label,.reveal legend,.reveal table,.reveal 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a/index.html b/index.html index a3bfd7d3..b7c67bcb 100644 --- a/index.html +++ b/index.html @@ -366,6 +366,10 @@ function linkify( selector ) { theme: Reveal.getQueryHash().theme, // available themes are in /css/theme transition: Reveal.getQueryHash().transition || 'default', // default/cube/page/concave/zoom/linear/fade/none + // Parallax scrolling + parallaxBackgroundImage: "url('https://s3.amazonaws.com/hakim-static/reveal-js/reveal-parallax-1.jpg')", + parallaxBackgroundSize: "2100px 900px", + // Optional libraries used to extend on reveal.js dependencies: [ { src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } }, diff --git a/js/reveal.js b/js/reveal.js index 794911c5..58943261 100644 --- a/js/reveal.js +++ b/js/reveal.js @@ -91,6 +91,12 @@ var Reveal = (function(){ // Transition style for full page slide backgrounds backgroundTransition: 'default', // default/linear/none + + // Parallax background image + parallaxBackgroundImage: '', // CSS syntax, e.g. "url('a.jpg')" + + // Parallax background size + parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px" // Number of slides away from the current that are visible viewDistance: 3, @@ -469,6 +475,25 @@ var Reveal = (function(){ } ); } ); + + // Add parallax background if specified so + var parallaxBackgroundImage = config.parallaxBackgroundImage, + parallaxBackgroundSize = config.parallaxBackgroundSize; + + if (parallaxBackgroundImage) { + dom.wrapper.style.background = parallaxBackgroundImage; + dom.wrapper.style.backgroundSize = parallaxBackgroundSize; + + // Make sure the below properties are set on the element - these properties are + // needed for proper transitions to be set on the element via CSS. To remove + // annoying background slide-in effect when the presentation starts, apply + // these properties after short time delay + setTimeout( function() { + dom.wrapper.setAttribute('data-parallax-background', parallaxBackgroundImage); + dom.wrapper.setAttribute('data-parallax-background-size', parallaxBackgroundSize); + }, 1 ); + + } } @@ -1470,8 +1495,32 @@ var Reveal = (function(){ // Store references to the previous and current slides currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide; - - + + // Animate parallax background + if (dom.wrapper.getAttribute('data-parallax-background') || config.parallaxBackgroundImage) { + var bs = dom.wrapper.style.backgroundSize.split(' '), + bgWidth, bgHeight; + + if (bs.length === 1) { + bgWidth = bgHeight = parseInt(bs[0], 10); + } else { + bgWidth = parseInt(bs[0], 10); + bgHeight = parseInt(bs[1], 10); + } + + + var slideWidth = parseInt(dom.wrapper.offsetWidth, 10); + var horizontalSlideCount = horizontalSlides.length; + var horizontalOffset = -(bgWidth - slideWidth)/(horizontalSlideCount-1) * h; + + var slideHeight = parseInt(dom.wrapper.offsetHeight, 10); + var verticalSlideCount = currentVerticalSlides.length; + var verticalOffset = verticalSlideCount > 0 ? -(bgHeight - slideHeight)/(verticalSlideCount-1) * v : 0; + + dom.wrapper.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px'; + } + + //////////////////////////////////// // Show fragment, if specified if( typeof f !== 'undefined' ) { var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) ); diff --git a/js/reveal.min.js b/js/reveal.min.js index b3985aa3..198d4193 100644 --- a/js/reveal.min.js +++ b/js/reveal.min.js @@ -1,8 +1,8 @@ /*! - * reveal.js 2.6.0-dev (2013-09-11, 21:54) + * reveal.js 2.6.0-dev (2013-09-15, 14:27) * http://lab.hakim.se/reveal-js * MIT licensed * * Copyright (C) 2013 Hakim El Hattab, http://hakim.se */ -var Reveal=function(){"use strict";function a(a){return b(),Kb||Jb?(window.addEventListener("load",C,!1),l(Qb,a),s(),c(),void 0):(document.body.setAttribute("class","no-transforms"),void 0)}function b(){Jb="WebkitPerspective"in document.body.style||"MozPerspective"in document.body.style||"msPerspective"in document.body.style||"OPerspective"in document.body.style||"perspective"in document.body.style,Kb="WebkitTransform"in document.body.style||"MozTransform"in document.body.style||"msTransform"in document.body.style||"OTransform"in document.body.style||"transform"in document.body.style,Lb=navigator.userAgent.match(/(iphone|ipod|android)/gi)}function c(){function a(){c.length&&head.js.apply(null,c),d()}for(var b=[],c=[],e=0,f=Qb.dependencies.length;f>e;e++){var g=Qb.dependencies[e];(!g.condition||g.condition())&&(g.async?c.push(g.src):b.push(g.src),"function"==typeof g.callback&&head.ready(g.src.match(/([\w\d_\-]*)\.?js$|[^\\\/]*$/i)[0],g.callback))}b.length?(head.ready(a),head.js.apply(null,b)):a()}function d(){f(),e(),i(),_(),setTimeout(function(){Vb.slides.classList.remove("no-transition"),Rb=!0,u("ready",{indexh:Fb,indexv:Gb,currentSlide:Ib})},1)}function e(){var a=m(document.querySelectorAll(Nb));a.forEach(function(a){var b=m(a.querySelectorAll("section"));b.forEach(function(a,b){b>0&&a.classList.add("future")})})}function f(){Vb.theme=document.querySelector("#theme"),Vb.wrapper=document.querySelector(".reveal"),Vb.slides=document.querySelector(".reveal .slides"),Vb.slides.classList.add("no-transition"),Vb.background=g(Vb.wrapper,"div","backgrounds",null),Vb.progress=g(Vb.wrapper,"div","progress",""),Vb.progressbar=Vb.progress.querySelector("span"),g(Vb.wrapper,"aside","controls",'
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