/*
* Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.awt.event;
import java.util.EventListener;
/**
* The listener interface for receiving hierarchy changed events.
* The class that is interested in processing a hierarchy changed event
* should implement this interface.
* The listener object created from that class is then registered with a
* Component using the Component's <code>addHierarchyListener</code>
* method. When the hierarchy to which the Component belongs changes, the
* <code>hierarchyChanged</code> method in the listener object is invoked,
* and the <code>HierarchyEvent</code> is passed to it.
* <p>
* Hierarchy events are provided for notification purposes ONLY;
* The AWT will automatically handle changes to the hierarchy internally so
* that GUI layout, displayability, and visibility work properly regardless
* of whether a program registers a <code>HierarchyListener</code> or not.
*
* @author David Mendenhall
* @see HierarchyEvent
* @since 1.3
*/
public interface HierarchyListener extends EventListener {
/**
* Called when the hierarchy has been changed. To discern the actual
* type of change, call <code>HierarchyEvent.getChangeFlags()</code>.
*
* @see HierarchyEvent#getChangeFlags()
*/
public void hierarchyChanged(HierarchyEvent e);
}