/*
* Copyright 2012 JBoss, by Red Hat, Inc
*
* 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 org.jboss.errai.ui.shared.api.style;
import org.slf4j.LoggerFactory;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.EventListener;
/**
* @author Mike Brock
*/
public class ElementBinding {
private final Element element;
private final EventListener newListener;
private final EventListener originalEventListener;
public ElementBinding(final StyleBindingsRegistry registery, final Element element) {
this.element = element;
this.originalEventListener = DOM.getEventListener(element);
this.newListener = new EventListener() {
@Override
public void onBrowserEvent(Event event) {
if (event.getTypeInt() == Event.ONCHANGE) {
registery.updateStyles();
}
if (originalEventListener != null) {
originalEventListener.onBrowserEvent(event);
}
}
};
DOM.setEventListener(element, newListener);
}
public Element getElement() {
return element;
}
public void clean() {
if (originalEventListener != null) {
if (DOM.getEventListener(element) != newListener) {
LoggerFactory.getLogger(getClass())
.warn("cannot unwrap element binding for: " + element + "; found unexpected listener.");
}
else {
DOM.setEventListener(element, originalEventListener);
}
}
}
}