1 /******************************************************************************* 2 * Copyright (c) 2000, 2005 IBM Corporation and others. 3 * All rights reserved. This program and the accompanying materials 4 * are made available under the terms of the Eclipse Public License v1.0 5 * which accompanies this distribution, and is available at 6 * http://www.eclipse.org/legal/epl-v10.html 7 * 8 * Contributors: 9 * IBM Corporation - initial API and implementation 10 *******************************************************************************/ 11 package org.eclipse.swt.events; 12 13 14 import org.eclipse.swt.internal.SWTEventListener; 15 16 /** 17 * Classes which implement this interface provide methods 18 * that deal with the expanding and collapsing of tree 19 * branches. 20 * <p> 21 * After creating an instance of a class that implements 22 * this interface it can be added to a tree control using the 23 * <code>addTreeListener</code> method and removed using 24 * the <code>removeTreeListener</code> method. When a branch 25 * of the tree is expanded or collapsed, the appropriate method 26 * will be invoked. 27 * </p> 28 * 29 * @see TreeAdapter 30 * @see TreeEvent 31 */ 32 public interface TreeListener extends SWTEventListener { 33 34 /** 35 * Sent when a tree branch is collapsed. 36 * 37 * @param e an event containing information about the tree operation 38 */ 39 public void treeCollapsed(TreeEvent e); 40 41 /** 42 * Sent when a tree branch is expanded. 43 * 44 * @param e an event containing information about the tree operation 45 */ 46 public void treeExpanded(TreeEvent e); 47 } 48