/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
module dwt.events.ExpandListener;

import dwt.dwthelper.utils;

import dwt.internal.DWTEventListener;

/**
 * Classes which implement this interface provide methods
 * that deal with the expanding and collapsing of <code>ExpandItem</code>s.
 *
 * <p>
 * After creating an instance of a class that implements
 * this interface it can be added to a <code>ExpandBar</code> 
 * control using the <code>addExpandListener</code> method and
 * removed using the <code>removeExpandListener</code> method. 
 * When a item of the <code>ExpandBar</code> is expanded or
 * collapsed, the appropriate method will be invoked.
 * </p>
 *
 * @see ExpandAdapter
 * @see ExpandEvent
 * 
 * @since 3.2
 */
public interface ExpandListener : DWTEventListener {

/**
 * Sent when an item is collapsed.
 *
 * @param e an event containing information about the operation
 */
public void itemCollapsed(ExpandEvent e);

/**
 * Sent when an item is expanded.
 *
 * @param e an event containing information about the operation
 */
public void itemExpanded(ExpandEvent e);
}