| /* |
| * Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * 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). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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); |
| } |