X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/ee06f37b0f6f6d94cd05a6ffae556660f7c4a2bc..c930e9176a5a85509c5b0230e2bff5c22a591432:/src/util/CSS.js

diff --git a/src/util/CSS.js b/src/util/CSS.js
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+/*!
+ * Ext JS Library 3.0.0
+ * Copyright(c) 2006-2009 Ext JS, LLC
+ * licensing@extjs.com
+ * http://www.extjs.com/license
+ */
+/**
+ * @class Ext.util.CSS
+ * Utility class for manipulating CSS rules
+ * @singleton
+ */
+Ext.util.CSS = function(){
+	var rules = null;
+   	var doc = document;
+
+    var camelRe = /(-[a-z])/gi;
+    var camelFn = function(m, a){ return a.charAt(1).toUpperCase(); };
+
+   return {
+   /**
+    * Creates a stylesheet from a text blob of rules.
+    * These rules will be wrapped in a STYLE tag and appended to the HEAD of the document.
+    * @param {String} cssText The text containing the css rules
+    * @param {String} id An id to add to the stylesheet for later removal
+    * @return {StyleSheet}
+    */
+   createStyleSheet : function(cssText, id){
+       var ss;
+       var head = doc.getElementsByTagName("head")[0];
+       var rules = doc.createElement("style");
+       rules.setAttribute("type", "text/css");
+       if(id){
+           rules.setAttribute("id", id);
+       }
+       if(Ext.isIE){
+           head.appendChild(rules);
+           ss = rules.styleSheet;
+           ss.cssText = cssText;
+       }else{
+           try{
+                rules.appendChild(doc.createTextNode(cssText));
+           }catch(e){
+               rules.cssText = cssText;
+           }
+           head.appendChild(rules);
+           ss = rules.styleSheet ? rules.styleSheet : (rules.sheet || doc.styleSheets[doc.styleSheets.length-1]);
+       }
+       this.cacheStyleSheet(ss);
+       return ss;
+   },
+
+   /**
+    * Removes a style or link tag by id
+    * @param {String} id The id of the tag
+    */
+   removeStyleSheet : function(id){
+       var existing = doc.getElementById(id);
+       if(existing){
+           existing.parentNode.removeChild(existing);
+       }
+   },
+
+   /**
+    * Dynamically swaps an existing stylesheet reference for a new one
+    * @param {String} id The id of an existing link tag to remove
+    * @param {String} url The href of the new stylesheet to include
+    */
+   swapStyleSheet : function(id, url){
+       this.removeStyleSheet(id);
+       var ss = doc.createElement("link");
+       ss.setAttribute("rel", "stylesheet");
+       ss.setAttribute("type", "text/css");
+       ss.setAttribute("id", id);
+       ss.setAttribute("href", url);
+       doc.getElementsByTagName("head")[0].appendChild(ss);
+   },
+   
+   /**
+    * Refresh the rule cache if you have dynamically added stylesheets
+    * @return {Object} An object (hash) of rules indexed by selector
+    */
+   refreshCache : function(){
+       return this.getRules(true);
+   },
+
+   // private
+   cacheStyleSheet : function(ss){
+       if(!rules){
+           rules = {};
+       }
+       try{// try catch for cross domain access issue
+           var ssRules = ss.cssRules || ss.rules;
+           for(var j = ssRules.length-1; j >= 0; --j){
+               rules[ssRules[j].selectorText] = ssRules[j];
+           }
+       }catch(e){}
+   },
+   
+   /**
+    * Gets all css rules for the document
+    * @param {Boolean} refreshCache true to refresh the internal cache
+    * @return {Object} An object (hash) of rules indexed by selector
+    */
+   getRules : function(refreshCache){
+   		if(rules === null || refreshCache){
+   			rules = {};
+   			var ds = doc.styleSheets;
+   			for(var i =0, len = ds.length; i < len; i++){
+   			    try{
+    		        this.cacheStyleSheet(ds[i]);
+    		    }catch(e){} 
+	        }
+   		}
+   		return rules;
+   	},
+   	
+   	/**
+    * Gets an an individual CSS rule by selector(s)
+    * @param {String/Array} selector The CSS selector or an array of selectors to try. The first selector that is found is returned.
+    * @param {Boolean} refreshCache true to refresh the internal cache if you have recently updated any rules or added styles dynamically
+    * @return {CSSRule} The CSS rule or null if one is not found
+    */
+   getRule : function(selector, refreshCache){
+   		var rs = this.getRules(refreshCache);
+   		if(!Ext.isArray(selector)){
+   		    return rs[selector];
+   		}
+   		for(var i = 0; i < selector.length; i++){
+			if(rs[selector[i]]){
+				return rs[selector[i]];
+			}
+		}
+		return null;
+   	},
+   	
+   	
+   	/**
+    * Updates a rule property
+    * @param {String/Array} selector If it's an array it tries each selector until it finds one. Stops immediately once one is found.
+    * @param {String} property The css property
+    * @param {String} value The new value for the property
+    * @return {Boolean} true If a rule was found and updated
+    */
+   updateRule : function(selector, property, value){
+   		if(!Ext.isArray(selector)){
+   			var rule = this.getRule(selector);
+   			if(rule){
+   				rule.style[property.replace(camelRe, camelFn)] = value;
+   				return true;
+   			}
+   		}else{
+   			for(var i = 0; i < selector.length; i++){
+   				if(this.updateRule(selector[i], property, value)){
+   					return true;
+   				}
+   			}
+   		}
+   		return false;
+   	}
+   };	
+}();
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