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    1   /*
    2    * Copyright (c) 1997, 1999, 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   
   26   package javax.swing.event;
   27   
   28   import java.util.EventListener;
   29   
   30   /**
   31     * The listener that's notified when a tree expands or collapses
   32     * a node.
   33     * For further documentation and examples see
   34     * <a
   35     href="http://java.sun.com/docs/books/tutorial/uiswing/events/treeexpansionlistener.html">How to Write a Tree Expansion Listener</a>,
   36     * a section in <em>The Java Tutorial.</em>
   37     *
   38     * @author Scott Violet
   39     */
   40   
   41   public interface TreeExpansionListener extends EventListener
   42   {
   43       /**
   44         * Called whenever an item in the tree has been expanded.
   45         */
   46       public void treeExpanded(TreeExpansionEvent event);
   47   
   48       /**
   49         * Called whenever an item in the tree has been collapsed.
   50         */
   51       public void treeCollapsed(TreeExpansionEvent event);
   52   }

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