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JDK 1.6
  javax.swing.event. TreeWillExpandListener View Javadoc
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/*
 * @(#)TreeWillExpandListener.java	1.10 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

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>
  *
  * @version 1.10 11/17/05
  * @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;
}

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