/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.viewers;

 
/** 
  * A listener which is notified when a tree viewer expands or collapses
  * a node.
  */
public interface ITreeViewerListener {
/**
 * Notifies that a node in the tree has been collapsed.
 *
 * @param event event object describing details
 */
public void treeCollapsed(TreeExpansionEvent event);
/**
 * Notifies that a node in the tree has been expanded.
 *
 * @param event event object describing details
 */
public void treeExpanded(TreeExpansionEvent event);
}