merge dom setup refactor #544

2 files changed, 32 insertions, 35 deletions

diff --git a/js/reveal.js b/js/reveal.js
index 08fd474..fd281cb 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -222,49 +222,26 @@ var Reveal = (function(){
 		dom.slides.classList.add( 'no-transition' );
 
 		// Background element
-		if( !document.querySelector( '.reveal .backgrounds' ) ) {
-			dom.background = document.createElement( 'div' );
-			dom.background.classList.add( 'backgrounds' );
-			dom.wrapper.appendChild( dom.background );
-		}
+		dom.background = createSingletonNode( dom.wrapper, 'div', 'backgrounds', null );
 
 		// Progress bar
-		if( !dom.wrapper.querySelector( '.progress' ) ) {
-			var progressElement = document.createElement( 'div' );
-			progressElement.classList.add( 'progress' );
-			progressElement.innerHTML = '<span></span>';
-			dom.wrapper.appendChild( progressElement );
-		}
+		dom.progress = createSingletonNode( dom.wrapper, 'div', 'progress', '<span></span>' );
+		dom.progressbar = dom.progress.querySelector( 'span' );
 
 		// Arrow controls
-		if( !dom.wrapper.querySelector( '.controls' ) ) {
-			var controlsElement = document.createElement( 'aside' );
-			controlsElement.classList.add( 'controls' );
-			controlsElement.innerHTML = '<div class="navigate-left"></div>' +
-										'<div class="navigate-right"></div>' +
-										'<div class="navigate-up"></div>' +
-										'<div class="navigate-down"></div>';
-			dom.wrapper.appendChild( controlsElement );
-		}
+		createSingletonNode( dom.wrapper, 'aside', 'controls',
+			'<div class="navigate-left"></div>' +
+			'<div class="navigate-right"></div>' +
+			'<div class="navigate-up"></div>' +
+			'<div class="navigate-down"></div>' );
 
 		// State background element [DEPRECATED]
-		if( !dom.wrapper.querySelector( '.state-background' ) ) {
-			var stateBackgroundElement = document.createElement( 'div' );
-			stateBackgroundElement.classList.add( 'state-background' );
-			dom.wrapper.appendChild( stateBackgroundElement );
-		}
+		createSingletonNode( dom.wrapper, 'div', 'state-background', null );
 
 		// Overlay graphic which is displayed during the paused mode
-		if( !dom.wrapper.querySelector( '.pause-overlay' ) ) {
-			var pausedElement = document.createElement( 'div' );
-			pausedElement.classList.add( 'pause-overlay' );
-			dom.wrapper.appendChild( pausedElement );
-		}
+		createSingletonNode( dom.wrapper, 'div', 'pause-overlay', null );
 
 		// Cache references to elements
-		dom.progress = document.querySelector( '.reveal .progress' );
-		dom.progressbar = document.querySelector( '.reveal .progress span' );
-
 		if ( config.controls ) {
 			dom.controls = document.querySelector( '.reveal .controls' );
 
@@ -280,6 +257,26 @@ var Reveal = (function(){
 	}
 
 	/**
+	 * Creates an HTML element and returns a reference to it.
+	 * If the element already exists the existing instance will
+	 * be returned.
+	 */
+	function createSingletonNode( container, tagname, classname, innerHTML ) {
+
+		var node = container.querySelector( '.' + classname );
+		if( !node ) {
+			node = document.createElement( tagname );
+			node.classList.add( classname );
+			if( innerHTML !== null ) {
+				node.innerHTML = innerHTML;
+			}
+			container.appendChild( node );
+		}
+		return node;
+
+	}
+
+	/**
 	 * Creates the slide background elements and appends them
 	 * to the background container. One element is created per
 	 * slide no matter if the given slide has visible background.
diff --git a/js/reveal.min.js b/js/reveal.min.js
index f51c783..ad0c80c 100644
--- a/js/reveal.min.js
+++ b/js/reveal.min.js
@@ -1,8 +1,8 @@
 /*!
- * reveal.js 2.5.0 (2013-08-11, 16:31)
+ * reveal.js 2.5.0 (2013-08-11, 16:46)
  * 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 t(),Dt||Pt?(window.addEventListener("load",S,!1),d(Yt,e),o(),a(),void 0):(document.body.setAttribute("class","no-transforms"),void 0)}function t(){Pt="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,Dt="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,Nt=navigator.userAgent.match(/(iphone|ipod|android)/gi)}function n(){if(Wt.theme=document.querySelector("#theme"),Wt.wrapper=document.querySelector(".reveal"),Wt.slides=document.querySelector(".reveal .slides"),Wt.slides.classList.add("no-transition"),document.querySelector(".reveal .backgrounds")||(Wt.background=document.createElement("div"),Wt.background.classList.add("backgrounds"),Wt.wrapper.appendChild(Wt.background)),!Wt.wrapper.querySelector(".progress")){var e=document.createElement("div");e.classList.add("progress"),e.innerHTML="<span></span>",Wt.wrapper.appendChild(e)}if(!Wt.wrapper.querySelector(".controls")){var t=document.createElement("aside");t.classList.add("controls"),t.innerHTML='<div class="navigate-left"></div><div class="navigate-right"></div><div class="navigate-up"></div><div class="navigate-down"></div>',Wt.wrapper.appendChild(t)}if(!Wt.wrapper.querySelector(".state-background")){var n=document.createElement("div");n.classList.add("state-background"),Wt.wrapper.appendChild(n)}if(!Wt.wrapper.querySelector(".pause-overlay")){var r=document.createElement("div");r.classList.add("pause-overlay"),Wt.wrapper.appendChild(r)}Wt.progress=document.querySelector(".reveal .progress"),Wt.progressbar=document.querySelector(".reveal .progress 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