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    1   /*
    2    * Copyright (c) 1996, 2006, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package java.awt.event;
   27   
   28   import java.util.EventListener;
   29   
   30   /**
   31    * The listener interface for receiving component events.
   32    * The class that is interested in processing a component event
   33    * either implements this interface (and all the methods it
   34    * contains) or extends the abstract <code>ComponentAdapter</code> class
   35    * (overriding only the methods of interest).
   36    * The listener object created from that class is then registered with a
   37    * component using the component's <code>addComponentListener</code>
   38    * method. When the component's size, location, or visibility
   39    * changes, the relevant method in the listener object is invoked,
   40    * and the <code>ComponentEvent</code> is passed to it.
   41    * <P>
   42    * Component events are provided for notification purposes ONLY;
   43    * The AWT will automatically handle component moves and resizes
   44    * internally so that GUI layout works properly regardless of
   45    * whether a program registers a <code>ComponentListener</code> or not.
   46    *
   47    * @see ComponentAdapter
   48    * @see ComponentEvent
   49    * @see <a href="http://java.sun.com/docs/books/tutorial/post1.0/ui/componentlistener.html">Tutorial: Writing a Component Listener</a>
   50    *
   51    * @author Carl Quinn
   52    * @since 1.1
   53    */
   54   public interface ComponentListener extends EventListener {
   55       /**
   56        * Invoked when the component's size changes.
   57        */
   58       public void componentResized(ComponentEvent e);
   59   
   60       /**
   61        * Invoked when the component's position changes.
   62        */
   63       public void componentMoved(ComponentEvent e);
   64   
   65       /**
   66        * Invoked when the component has been made visible.
   67        */
   68       public void componentShown(ComponentEvent e);
   69   
   70       /**
   71        * Invoked when the component has been made invisible.
   72        */
   73       public void componentHidden(ComponentEvent e);
   74   }

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