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