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94 lines
2.3 KiB
JavaScript
94 lines
2.3 KiB
JavaScript
/**
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* eGroupWare egw_action framework - egw action framework
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*
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* @link http://www.egroupware.org
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* @author Andreas Stöckel <as@stylite.de>
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* @copyright 2011 by Andreas Stöckel
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package egw_action
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* @version $Id$
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*/
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/**
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* Contains the egwDynStyleSheet class which allows dynamic generation of stylesheet
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* rules - updating a single stylesheet rule is way more efficient than updating
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* the element style of many objects.
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*/
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var EGW_DYNAMIC_STYLESHEET = null;
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/**
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* Main egwDynStyleSheet class - all egwDynStyleSheets share the same stylesheet
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* which is dynamically inserted into the head section of the DOM-Tree.
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* This stylesheet is created with the first egwDynStyleSheet class.
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*/
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function egwDynStyleSheet()
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{
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// Check whether the EGW_DYNAMIC_STYLESHEET has already be created
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if (!EGW_DYNAMIC_STYLESHEET)
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{
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var style = document.createElement("style");
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document.getElementsByTagName("head")[0].appendChild(style);
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this.styleSheet = style.sheet ? style.sheet : style.styleSheet;
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this.selectors = {};
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this.selectorCount = 0;
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EGW_DYNAMIC_STYLESHEET = this;
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return this;
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}
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else
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{
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return EGW_DYNAMIC_STYLESHEET;
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}
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}
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/**
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* Creates/Updates the given stylesheet rule. Example call:
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*
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* styleSheet.updateRule("#container", "background-color: blue; font-family: sans;")
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*
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* @param string _selector is the css selector to which the given rule should apply
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* @param string _rule is the rule which is bound to the selector.
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*/
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egwDynStyleSheet.prototype.updateRule = function (_selector, _rule)
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{
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var ruleObj = {
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"index": this.selectorCount
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}
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// Remove any existing rule first
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if (typeof this.selectors[_selector] !== "undefined")
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{
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var ruleObj = this.selectors[_selector];
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if (typeof this.styleSheet.removeRule !== "undefined")
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{
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this.styleSheet.removeRule(ruleObj.index);
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}
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else
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{
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this.styleSheet.deleteRule(ruleObj.index);
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}
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delete (this.selectors[_selector]);
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}
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else
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{
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this.selectorCount++;
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}
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// Add the rule to the stylesheet
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if (typeof this.styleSheet.addRule !== "undefined")
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{
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this.styleSheet.addRule(_selector, _rule, ruleObj.index);
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}
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else
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{
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this.styleSheet.insertRule(_selector + "{" + _rule + "}", ruleObj.index);
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}
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this.selectors[_selector] = ruleObj;
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}
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