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Vaadin is a web application framework for Rich Internet Applications (RIA). Vaadin enables easy development and maintenance of fast and secure rich web applications with a stunning look and feel and a wide browser support. It features a server-side architecture with the majority of the logic running on the server. Ajax technology is used at the browser-side to ensure a rich and interactive user experience.

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/*
 * Copyright 2000-2014 Vaadin Ltd.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.vaadin.client;

import com.google.gwt.core.client.JavaScriptObject;

/**
 * Utility class for fetching CSS properties from DOM StyleSheets JS object.
 */
public class CSSRule {

    private final String selector;
    private JavaScriptObject rules = null;

    /**
     * 
     * @param selector
     *            the CSS selector to search for in the stylesheets
     * @param deep
     *            should the search follow any @import statements?
     */
    public CSSRule(final String selector, final boolean deep) {
        this.selector = selector;
        fetchRule(selector, deep);
    }

    // TODO how to find the right LINK-element? We should probably give the
    // stylesheet a name.
    private native void fetchRule(final String selector, final boolean deep)
    /*-{
    var sheets = $doc.styleSheets;
    for(var i = 0; i < sheets.length; i++) {
    var sheet = sheets[i];
    if(sheet.href && sheet.href.indexOf("VAADIN/themes")>-1) {
    // $entry not needed as function is not exported
    [email protected]::rules = @com.vaadin.client.CSSRule::searchForRule(Lcom/google/gwt/core/client/JavaScriptObject;Ljava/lang/String;Z)(sheet, selector, deep);
    return;
    }
    }
    [email protected]::rules = [];
    }-*/;

    /*
     * Loops through all current style rules and collects all matching to
     * 'rules' array. The array is reverse ordered (last one found is first).
     */
    private static native JavaScriptObject searchForRule(
            final JavaScriptObject sheet, final String selector,
            final boolean deep)
    /*-{
    if(!$doc.styleSheets)
    return null;

    selector = selector.toLowerCase();

    var allMatches = [];

    // IE handles imported sheet differently
    if(deep && sheet.imports && sheet.imports.length > 0) {
    for(var i=0; i < sheet.imports.length; i++) {
    // $entry not needed as function is not exported
    var imports = @com.vaadin.client.CSSRule::searchForRule(Lcom/google/gwt/core/client/JavaScriptObject;Ljava/lang/String;Z)(sheet.imports[i], selector, deep);
    allMatches.concat(imports);
    }
    }

    var theRules = new Array();
    if (sheet.cssRules)
    theRules = sheet.cssRules
    else if (sheet.rules)
    theRules = sheet.rules

    var j = theRules.length;
    for(var i=0; i