From 7b5e5371576c8c57196828745e4d28adceb8417e Mon Sep 17 00:00:00 2001 From: Hakim El Hattab Date: Sat, 10 Aug 2013 12:52:28 -0400 Subject: [PATCH] much improved distance measuring logic, improves performance on mobile and fixes some crashes --- js/reveal.js | 84 +++++++++++++++++++++++++++++++++++++++++------- js/reveal.min.js | 4 +-- 2 files changed, 74 insertions(+), 14 deletions(-) diff --git a/js/reveal.js b/js/reveal.js index 31639fa..d86c22c 100644 --- a/js/reveal.js +++ b/js/reveal.js @@ -14,6 +14,8 @@ var Reveal = (function(){ VERTICAL_SLIDES_SELECTOR = '.reveal .slides>section.present>section', HOME_SLIDE_SELECTOR = '.reveal .slides>section:first-child', + IS_MOBILE = navigator.userAgent.match( /(iphone|ipod|android)/gi ), + // Configurations defaults, can be overridden at initialization time config = { @@ -1029,7 +1031,6 @@ var Reveal = (function(){ htransform = 'translateZ(-2500px) translate(' + ( ( i - indexh ) * hoffset ) + '%, 0%)'; hslide.setAttribute( 'data-index-h', i ); - hslide.style.display = 'block'; hslide.style.WebkitTransform = htransform; hslide.style.MozTransform = htransform; hslide.style.msTransform = htransform; @@ -1048,7 +1049,6 @@ var Reveal = (function(){ vslide.setAttribute( 'data-index-h', i ); vslide.setAttribute( 'data-index-v', j ); - vslide.style.display = 'block'; vslide.style.WebkitTransform = vtransform; vslide.style.MozTransform = vtransform; vslide.style.msTransform = vtransform; @@ -1068,6 +1068,8 @@ var Reveal = (function(){ } } + updateSlidesVisibility(); + layout(); if( !wasActive ) { @@ -1309,6 +1311,9 @@ var Reveal = (function(){ 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 @@ -1480,16 +1485,6 @@ var Reveal = (function(){ for( var i = 0; i < slidesLength; i++ ) { var element = slides[i]; - // Optimization; hide all slides that are three or more steps - // away from the present slide - if( isOverview() === false ) { - // The distance loops so that it measures 1 between the first - // and last slides - var distance = Math.abs( ( index - i ) % ( slidesLength - 3 ) ) || 0; - - element.style.display = distance > 3 ? 'none' : 'block'; - } - var reverse = config.rtl && !isVerticalSlide( element ); element.classList.remove( 'past' ); @@ -1555,6 +1550,71 @@ var Reveal = (function(){ } + /** + * 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( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ), + horizontalSlidesLength = horizontalSlides.length, + distance; + + if( horizontalSlidesLength ) { + + // The number of steps away from the present slide that will + // be visible + var threshold = 3; + + // Heavily limited on weaker devices + if( IS_MOBILE ) { + threshold = 1; + } + + if( isOverview() ) { + threshold = 6; + } + + for( var x = 0; x < horizontalSlidesLength; x++ ) { + var horizontalSlide = horizontalSlides[x]; + + var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) ), + verticalSlidesLength = verticalSlides.length; + + if( verticalSlidesLength ) { + + // Always show the vertical stack itself, even if its child + // slides are invisible + horizontalSlide.style.display = 'block'; + + for( var y = 0; y < verticalSlidesLength; y++ ) { + var verticalSlide = verticalSlides[y]; + + var dx = x - indexh, + dy = y - indexv; + + distance = Math.sqrt( dx*dx + dy*dy ); + + verticalSlide.style.display = distance > threshold ? 'none' : 'block'; + } + + } + else { + + // Loops so that it measures 1 between the first and last slides + distance = Math.abs( ( indexh - x ) % ( horizontalSlidesLength - threshold ) ) || 0; + + horizontalSlide.style.display = distance > threshold ? 'none' : 'block'; + + } + } + + } + + } + /** * Updates the progress bar to reflect the current slide. */ diff --git a/js/reveal.min.js b/js/reveal.min.js index aab8f26..8752c35 100644 --- a/js/reveal.min.js +++ b/js/reveal.min.js @@ -1,8 +1,8 @@ /*! - * reveal.js 2.5.0 (2013-08-08, 10:21) + * reveal.js 2.5.0 (2013-08-10, 12:49) * http://lab.hakim.se/reveal-js * MIT licensed * * Copyright (C) 2013 Hakim El Hattab, http://hakim.se */ -var Reveal=function(){"use strict";function e(e){return zt||Yt?(window.addEventListener("load",k,!1),l(Ct,e),r(),o(),void 0):(document.body.setAttribute("class","no-transforms"),void 0)}function t(){if(Ot.theme=document.querySelector("#theme"),Ot.wrapper=document.querySelector(".reveal"),Ot.slides=document.querySelector(".reveal .slides"),document.querySelector(".reveal .backgrounds")||(Ot.background=document.createElement("div"),Ot.background.classList.add("backgrounds"),Ot.wrapper.appendChild(Ot.background)),!Ot.wrapper.querySelector(".progress")){var e=document.createElement("div");e.classList.add("progress"),e.innerHTML="",Ot.wrapper.appendChild(e)}if(!Ot.wrapper.querySelector(".controls")){var t=document.createElement("aside");t.classList.add("controls"),t.innerHTML='
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