/*
 * @(#)ContainerListener.java	1.8 00/02/02
 *
 * Copyright 1996-2000 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */

package java.awt.event;

import java.util.EventListener;

/**
 * The listener interface for receiving container events.
 * The class that is interested in processing a container event
 * either implements this interface (and all the methods it
 * contains) or extends the abstract <code>ContainerAdapter</code> class
 * (overriding only the methods of interest).
 * The listener object created from that class is then registered with a
 * component using the component's <code>addContainerListener</code> 
 * method. When the container's contents change because a component
 * has been added or removed, the relevant method in the listener object 
 * is invoked, and the <code>ContainerEvent</code> is passed to it.
 * <P>
 * Container events are provided for notification purposes ONLY;
 * The AWT will automatically handle add and remove operations
 * internally so the program works properly regardless of
 * whether the program registers a <code>ComponentListener</code> or not.
 *
 * @see ContainerAdapter
 * @see ContainerEvent
 * @see <a href="http://java.sun.com/docs/books/tutorial/post1.0/ui/containerlistener.html">Tutorial: Writing a Container Listener</a>
 * @see <a href="http://www.awl.com/cp/javaseries/jcl1_2.html">Reference: The Java Class Libraries (update file)</a>
 *
 * @author Tim Prinzing
 * @author Amy Fowler
 * @version 1.8 02/02/00
 * @since 1.1
 */
public interface ContainerListener extends EventListener {
    /**
     * Invoked when a component has been added to the container.
     */
    public void componentAdded(ContainerEvent e);

    /**
     * Invoked when a component has been removed from the container.
     */    
    public void componentRemoved(ContainerEvent e);

}