1 /* 2 * Copyright (c) 1998, 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 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://docs.oracle.com/javase/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 }