001    /*
002     * Copyright 2006 Google Inc.
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License"); you may not
005     * use this file except in compliance with the License. You may obtain a copy of
006     * the License at
007     * 
008     * http://www.apache.org/licenses/LICENSE-2.0
009     * 
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
012     * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
013     * License for the specific language governing permissions and limitations under
014     * the License.
015     */
016    package com.google.gwt.user.client.ui;
017    
018    import java.util.EventListener;
019    
020    /**
021     * Event listener interface for 'change' events.
022     */
023    public interface ChangeListener extends EventListener {
024    
025      /**
026       * Fired when a widget changes, where 'change' is defined by the widget
027       * sending the event.
028       * 
029       * @param sender the widget that has changed.
030       */
031      void onChange(Widget sender);
032    }