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/*
* Ext JS Library 2.2.1
* Copyright(c) 2006-2009, Ext JS, LLC.
* licensing@extjs.com
*
* http://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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