com.google.gwt.chrome.crx.client.events.MessageEvent.java Source code

Introduction

Here is the source code for com.google.gwt.chrome.crx.client.events.MessageEvent.java

Source

/*
 * Copyright 2009 Google 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 com.google.gwt.chrome.crx.client.events;

import com.google.gwt.core.client.JavaScriptObject;

/**
 * Wraps event returned when a port has a message.
 * 
 * See documentation at: <a href=
 * "http://dev.chromium.org/developers/design-documents/extensions/content-scripts"
 * >Content Script Messaging</a>
 */
public class MessageEvent extends Event {
    /**
     * Subclass Message when you want to define a message type to send on a Port.
     */
    public static class Message extends Event {
        protected Message() {
        }
    }

    /**
     * Messaging handler that gets called each time you send a message on a Port.
     */
    public interface Listener {
        void onMessage(Message message);
    }

    protected MessageEvent() {
    }

    public final ListenerHandle addListener(Listener listener) {
        return new ListenerHandle(this, addListenerImpl(listener));
    }

    private native JavaScriptObject addListenerImpl(Listener listener) /*-{
                                                                       var handle = function(data) {
                                                                       listener.
                                                                       @com.google.gwt.chrome.crx.client.events.MessageEvent.Listener::onMessage(Lcom/google/gwt/chrome/crx/client/events/MessageEvent$Message;)
                                                                       (data);
                                                                       };
                                                                           
                                                                       this.addListener(handle);
                                                                       return handle;
                                                                       }-*/;
}