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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal.gwt.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 = $doc.styleSheets;
for(var i = 0; i < sheets.length; i++) {
var sheet = sheets[i];
if(sheet.href && sheet.href.indexOf("VAADIN/themes")>-1) {
this.@com.vaadin.terminal.gwt.client.CSSRule::rules = @com.vaadin.terminal.gwt.client.CSSRule::searchForRule(Lcom/google/gwt/core/client/JavaScriptObject;Ljava/lang/String;Z)(sheet, selector, deep);
return;
}
}
this.@com.vaadin.terminal.gwt.client.CSSRule::rules = [];
}-*/;
/*
* Loops through all current style rules and collects all matching to
* 'rules' array. The array is reverse ordered (last one found is first).
*/
private static native JavaScriptObject searchForRule(
final JavaScriptObject sheet, final String selector,
final boolean deep)
/*-{
if(!$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++) {
var imports = @com.vaadin.terminal.gwt.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
var imports = @com.vaadin.terminal.gwt.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.terminal.gwt.client.CSSRule::rules.length;
for(var i=0; i<j; i++) {
var value = this.@com.vaadin.terminal.gwt.client.CSSRule::rules[i].style[propertyName];
if(value)
return value;
}
return null;
}-*/;
public String getSelector() {
return selector;
}
}
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