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    1   /*
    2    * Copyright (c) 1997, 1998, 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   package javax.swing.event;
   26   
   27   import java.awt.event;
   28   import java.awt;
   29   import java.util;
   30   
   31   import javax.swing;
   32   
   33   /**
   34    * AncestorListener
   35    *
   36    * Interface to support notification when changes occur to a JComponent or one
   37    * of its ancestors.  These include movement and when the component becomes
   38    * visible or invisible, either by the setVisible() method or by being added
   39    * or removed from the component hierarchy.
   40    *
   41    * @author Dave Moore
   42    */
   43   public interface AncestorListener extends EventListener {
   44       /**
   45        * Called when the source or one of its ancestors is made visible
   46        * either by setVisible(true) being called or by its being
   47        * added to the component hierarchy.  The method is only called
   48        * if the source has actually become visible.  For this to be true
   49        * all its parents must be visible and it must be in a hierarchy
   50        * rooted at a Window
   51        */
   52       public void ancestorAdded(AncestorEvent event);
   53   
   54       /**
   55        * Called when the source or one of its ancestors is made invisible
   56        * either by setVisible(false) being called or by its being
   57        * remove from the component hierarchy.  The method is only called
   58        * if the source has actually become invisible.  For this to be true
   59        * at least one of its parents must by invisible or it is not in
   60        * a hierarchy rooted at a Window
   61        */
   62       public void ancestorRemoved(AncestorEvent event);
   63   
   64       /**
   65        * Called when either the source or one of its ancestors is moved.
   66        */
   67       public void ancestorMoved(AncestorEvent event);
   68   
   69   }

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