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package com.itmill.toolkit.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;
public CSSRule(String selector) {
this.selector = selector;
fetchRule(selector);
}
// TODO how to find the right LINK-element? We should probably give the
// stylesheet a name.
private native void fetchRule(final String selector)
/*-{
this.@com.itmill.toolkit.terminal.gwt.client.CSSRule::rules = @com.itmill.toolkit.terminal.gwt.client.CSSRule::searchForRule(Lcom/google/gwt/core/client/JavaScriptObject;Ljava/lang/String;)($doc.styleSheets[1], selector);
}-*/;
/*
* Loops through all current style rules and collects all matching to
* 'rules' array. The array is reverse ordered (last one found is first).
*/
private static native JavaScriptObject searchForRule(
JavaScriptObject sheet, final String selector)
/*-{
if(!$doc.styleSheets)
return null;
selector = selector.toLowerCase();
var allMatches = [];
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 == 3) {
allMatches.unshift(@com.itmill.toolkit.terminal.gwt.client.CSSRule::searchForRule(Lcom/google/gwt/core/client/JavaScriptObject;Ljava/lang/String;)(r.styleSheet, selector));
} else if(r.type == 1) {
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
}
}
}
}
return allMatches;
}-*/;
/**
* Returns a specific property value from this CSS rule.
*
* @param propertyName
* @return
*/
public native String getPropertyValue(final String propertyName)
/*-{
for(var i=0; i<this.@com.itmill.toolkit.terminal.gwt.client.CSSRule::rules.length; i++){
var value = this.@com.itmill.toolkit.terminal.gwt.client.CSSRule::rules[i].style[propertyName];
if(value)
return value;
}
return null;
}-*/;
public String getSelector() {
return selector;
}
}
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