1 /*
2 * Copyright 1998-1999 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package javax.swing.event;
27
28 import java.util.EventListener;
29 import javax.swing.tree.ExpandVetoException;
30
31 /**
32 * The listener that's notified when a tree expands or collapses
33 * a node.
34 * For further information and examples see
35 * <a href="http://java.sun.com/docs/books/tutorial/uiswing/events/treewillexpandlistener.html">How to Write a Tree-Will-Expand Listener</a>,
36 * a section in <em>The Java Tutorial.</em>
37 *
38 * @author Scott Violet
39 */
40
41 public interface TreeWillExpandListener extends EventListener {
42 /**
43 * Invoked whenever a node in the tree is about to be expanded.
44 */
45 public void treeWillExpand(TreeExpansionEvent event) throws ExpandVetoException;
46
47 /**
48 * Invoked whenever a node in the tree is about to be collapsed.
49 */
50 public void treeWillCollapse(TreeExpansionEvent event) throws ExpandVetoException;
51 }
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