/*
* Copyright 2010 Daniel Kurka
*
* 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.googlecode.mgwt.mvp.client;
import java.util.LinkedList;
import com.google.gwt.activity.shared.AbstractActivity;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.AcceptsOneWidget;
/**
* A baseclass for Activities which adds the ability to collect all handler instances and removes
* them when the activity is stopped.
*
* @author Daniel Kurka
*/
public abstract class MGWTAbstractActivity extends AbstractActivity {
private LinkedList<HandlerRegistration> oldHandlers;
private LinkedList<com.google.web.bindery.event.shared.HandlerRegistration> handlers;
public MGWTAbstractActivity() {
oldHandlers = new LinkedList<HandlerRegistration>();
handlers = new LinkedList<com.google.web.bindery.event.shared.HandlerRegistration>();
}
/**
* add a {@link HandlerRegistration} to the handler collection
*
* @param handlerRegistration a {@link com.google.gwt.event.shared.HandlerRegistration} object.
*/
protected void addHandlerRegistration(com.google.web.bindery.event.shared.HandlerRegistration handlerRegistration) {
handlers.add(handlerRegistration);
}
/**
* add a {@link HandlerRegistration} to the handler collection
*
* @param handlerRegistration a {@link com.google.gwt.event.shared.HandlerRegistration} object.
*/
protected void addHandlerRegistration(HandlerRegistration handlerRegistration) {
oldHandlers.add(handlerRegistration);
}
/**
* {@inheritDoc}
*
* onStop is overriden to automatically clear all {@link HandlerRegistration}
*/
@Override
public void onStop() {
super.onStop();
cancelAllHandlerRegistrations();
}
/**
* Remove all collected oldHandlers, and remove them from the collection
*/
protected void cancelAllHandlerRegistrations() {
for (HandlerRegistration hr : oldHandlers) {
hr.removeHandler();
}
oldHandlers.clear();
for (com.google.web.bindery.event.shared.HandlerRegistration hr : handlers) {
hr.removeHandler();
}
handlers.clear();
}
@Override
public void start(AcceptsOneWidget panel, EventBus eventBus) {
start(panel, (com.google.web.bindery.event.shared.EventBus) eventBus);
}
public void start(AcceptsOneWidget panel, com.google.web.bindery.event.shared.EventBus eventBus) {
}
}