From 89cc3f3a29c1b18ac716dde86dac8c81090ddf61 Mon Sep 17 00:00:00 2001 From: Hakim El Hattab Date: Wed, 30 Oct 2013 12:22:00 -0400 Subject: [PATCH] don't transition between identical backgrounds --- js/reveal.js | 52 +++++++++++++++++++++++++--- js/reveal.min.js | 4 +-- test/examples/slide-backgrounds.html | 21 +++++++++++ 3 files changed, 70 insertions(+), 7 deletions(-) diff --git a/js/reveal.js b/js/reveal.js index e7debb5..a69a91f 100644 --- a/js/reveal.js +++ b/js/reveal.js @@ -122,6 +122,8 @@ var Reveal = (function(){ previousSlide, currentSlide, + previousBackgroundHash, + // Slides may hold a data-state attribute which we pick up and apply // as a class to the body. This list contains the combined state of // all current slides. @@ -442,6 +444,7 @@ var Reveal = (function(){ }; var element = document.createElement( 'div' ); + element.setAttribute( 'data-background-hash', data.background + data.backgroundSize + data.backgroundImage + data.backgroundColor + data.backgroundRepeat + data.backgroundPosition + data.backgroundTransition ); element.className = 'slide-background'; if( data.background ) { @@ -1891,24 +1894,63 @@ var Reveal = (function(){ */ function updateBackground() { + 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 ) { - // Reverse past/future classes when in RTL mode - var horizontalPast = config.rtl ? 'future' : 'past', - horizontalFuture = config.rtl ? 'past' : 'future'; + backgroundh.className = 'slide-background '; - backgroundh.className = 'slide-background ' + ( h < indexh ? horizontalPast : h > indexh ? horizontalFuture : 'present' ); + if( h < indexh ) { + backgroundh.className += horizontalPast; + } + else if ( h > indexh ) { + backgroundh.className += horizontalFuture; + } + else { + backgroundh.className += 'present'; + + // Store a reference to the current background element + currentBackground = backgroundh; + } toArray( backgroundh.childNodes ).forEach( function( backgroundv, v ) { - backgroundv.className = 'slide-background ' + ( v < indexv ? 'past' : v > indexv ? 'future' : 'present' ); + backgroundv.className = 'slide-background '; + + if( v < indexv ) { + backgroundv.className += 'past'; + } + else if ( v > indexv ) { + backgroundv.className += 'future'; + } + else { + backgroundv.className += 'present'; + + // Only if this is the present horizontal and vertical slide + if( h === indexh ) currentBackground = backgroundv; + } } ); } ); + // Don't transition between identical backgrounds. This + // prevents unwanted flicker. + if( currentBackground ) { + var currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' ); + if( currentBackgroundHash === previousBackgroundHash ) { + dom.background.classList.add( 'no-transition' ); + } + + previousBackgroundHash = currentBackgroundHash; + } + // Allow the first background to apply without transition setTimeout( function() { dom.background.classList.remove( 'no-transition' ); diff --git a/js/reveal.min.js b/js/reveal.min.js index c114ee6..c0e9c27 100644 --- a/js/reveal.min.js +++ b/js/reveal.min.js @@ -1,8 +1,8 @@ /*! - * reveal.js 2.6.0-dev (2013-10-28, 08:44) + * reveal.js 2.6.0-dev (2013-10-30, 12:19) * 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){if(b(),!ac.transforms2d&&!ac.transforms3d)return document.body.setAttribute("class","no-transforms"),void 0;window.addEventListener("load",C,!1);var d=Reveal.getQueryHash();"undefined"!=typeof d.dependencies&&delete d.dependencies,l(Xb,a),l(Xb,d),s(),c()}function b(){ac.transforms3d="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,ac.transforms2d="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,ac.requestAnimationFrameMethod=window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame,ac.requestAnimationFrame="function"==typeof ac.requestAnimationFrameMethod,ac.canvas=!!document.createElement("canvas").getContext,Rb=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=Xb.dependencies.length;f>e;e++){var g=Xb.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(),bb(),setTimeout(function(){_b.slides.classList.remove("no-transition"),Yb=!0,u("ready",{indexh:Nb,indexv:Ob,currentSlide:Qb})},1)}function e(){var a=m(document.querySelectorAll(Ub));a.forEach(function(a){var b=m(a.querySelectorAll("section"));b.forEach(function(a,b){b>0&&a.classList.add("future")})})}function f(){_b.theme=document.querySelector("#theme"),_b.wrapper=document.querySelector(".reveal"),_b.slides=document.querySelector(".reveal .slides"),_b.slides.classList.add("no-transition"),_b.background=g(_b.wrapper,"div","backgrounds",null),_b.progress=g(_b.wrapper,"div","progress",""),_b.progressbar=_b.progress.querySelector("span"),g(_b.wrapper,"aside","controls",'
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c=document.querySelectorAll(Vb)[a],d=c&&c.querySelectorAll("section");return"undefined"!=typeof b?d?d[b]:void 0:c},getPreviousSlide:function(){return Pb},getCurrentSlide:function(){return Qb},getScale:function(){return _b},getConfig:function(){return Yb},getQueryHash:function(){var a={};location.search.replace(/[A-Z0-9]+?=(\w*)/gi,function(b){a[b.split("=").shift()]=b.split("=").pop()});for(var b in a){var c=a[b];"null"===c?a[b]=null:"true"===c?a[b]=!0:"false"===c?a[b]=!1:isNaN(parseFloat(c))||(a[b]=parseFloat(c))}return a},isFirstSlide:function(){return null==document.querySelector(Ub+".past")?!0:!1},isLastSlide:function(){return Qb?Qb.nextElementSibling?!1:K(Qb)&&Qb.parentNode.nextElementSibling?!1:!0:!1},isReady:function(){return Zb},addEventListener:function(a,b,c){"addEventListener"in window&&(ac.wrapper||document.querySelector(".reveal")).addEventListener(a,b,c)},removeEventListener:function(a,b,c){"addEventListener"in window&&(ac.wrapper||document.querySelector(".reveal")).removeEventListener(a,b,c)}}}(); \ No newline at end of file diff --git a/test/examples/slide-backgrounds.html b/test/examples/slide-backgrounds.html index 1e2da16..f5d601c 100644 --- a/test/examples/slide-backgrounds.html +++ b/test/examples/slide-backgrounds.html @@ -75,6 +75,27 @@

Same background twice (2/2)

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Same background twice vertical (1/2)

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Same background twice vertical (2/2)

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Same background from horizontal to vertical (1/3)

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Same background from horizontal to vertical (2/3)

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Same background from horizontal to vertical (3/3)

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+