- /*
- * Copyright 2000-2018 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) {
- // $entry not needed as function is not exported
- this.@com.vaadin.client.CSSRule::rules = @com.vaadin.client.CSSRule::searchForRule(Lcom/google/gwt/core/client/JavaScriptObject;Ljava/lang/String;Z)(sheet, selector, deep);
- return;
- }
- }
- this.@com.vaadin.client.CSSRule::rules = [];
- }-*/;
-
- /*
- * Loops through all current style rules and collects all matching to
- * 'rules' array. The array is reverse ordered (last one found is first).
- */
- private static native JavaScriptObject searchForRule(
- final JavaScriptObject sheet, final String selector,
- final boolean deep)
- /*-{
- if(!$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++) {
- // $entry not needed as function is not exported
- var imports = @com.vaadin.client.CSSRule::searchForRule(Lcom/google/gwt/core/client/JavaScriptObject;Ljava/lang/String;Z)(sheet.imports[i], selector, deep);
- allMatches.concat(imports);
- }
- }
-
- var theRules = new Array();
- if (sheet.cssRules)
- theRules = sheet.cssRules
- else if (sheet.rules)
- theRules = sheet.rules
-
- var j = theRules.length;
- for(var i=0; i<j; i++) {
- var r = theRules[i];
- if(r.type == 1 || sheet.imports) {
- var selectors = r.selectorText.toLowerCase().split(",");
- var n = selectors.length;
- for(var m=0; m<n; m++) {
- if(selectors[m].replace(/^\s+|\s+$/g, "") == selector) {
- allMatches.unshift(r);
- break; // No need to loop other selectors for this rule
- }
- }
- } else if(deep && r.type == 3) {
- // Search @import stylesheet
- // $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)(r.styleSheet, selector, deep);
- allMatches = allMatches.concat(imports);
- }
- }
-
- return allMatches;
- }-*/;
-
- /**
- * Returns a specific property value from this CSS rule.
- *
- * @param propertyName
- * camelCase CSS property name
- * @return the value of the property as a String
- */
- public native String getPropertyValue(final String propertyName)
- /*-{
- var j = this.@com.vaadin.client.CSSRule::rules.length;
- for(var i=0; i<j; i++) {
- // $entry not needed as function is not exported
- var value = this.@com.vaadin.client.CSSRule::rules[i].style[propertyName];
- if(value)
- return value;
- }
- return null;
- }-*/;
-
- public String getSelector() {
- return selector;
- }
-
- }
|