/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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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);
}