/*
* Copyright (c) 1998, 1999, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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package javax.swing.event;
import java.util.EventListener;
import javax.swing.tree.ExpandVetoException;
/**
* The listener that's notified when a tree expands or collapses
* a node.
* For further information and examples see
* <a href="http://java.sun.com/docs/books/tutorial/uiswing/events/treewillexpandlistener.html">How to Write a Tree-Will-Expand Listener</a>,
* a section in <em>The Java Tutorial.</em>
*
* @author Scott Violet
*/
public interface TreeWillExpandListener extends EventListener {
/**
* Invoked whenever a node in the tree is about to be expanded.
*/
public void treeWillExpand(TreeExpansionEvent event) throws ExpandVetoException;
/**
* Invoked whenever a node in the tree is about to be collapsed.
*/
public void treeWillCollapse(TreeExpansionEvent event) throws ExpandVetoException;
}