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5e3c67a5cf
classes are now uppercase and in their own files. lowercase classes are deprecated. Interfaces are now actual interfaces that should be implemented instead of creating and returning an ai Object every time
52 lines
1.8 KiB
TypeScript
Executable File
52 lines
1.8 KiB
TypeScript
Executable File
/**
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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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class EgwDynamicStyleSheet {
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private readonly styleSheet: CSSStyleSheet;
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//mapping of selectors to indices in the Stylesheet's CSSRuleList
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private selectors: Map<string, number>;
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//selector count is no longer needed, since insert rules returns the index to store in the map above
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constructor() {
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const style = document.createElement("style");
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document.head.appendChild(style);
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this.styleSheet = style.sheet;
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this.selectors = new Map;
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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(".someCssClass", "background-color: blue; font-family: sans;")
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*
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* @param selector is the css selector to which the given rule should apply
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* @param rule is the rule which is bound to the selector.
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*/
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public updateRule(selector: string, rule: string): void {
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// Remove any existing rule first
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if (this.selectors.has(selector)) {
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let index: number = this.selectors.get(selector)
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this.styleSheet.deleteRule(index)
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}
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//Add the rule to the stylesheet
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let index = this.styleSheet.insertRule(selector + "{" + rule + "}")
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this.selectors.set(selector, index)
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}
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}
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export const EGW_DYNAMIC_STYLESHEET: EgwDynamicStyleSheet = new EgwDynamicStyleSheet(); |