/*******************************************************************************
 * Copyright (c) 2000, 2004 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
 *******************************************************************************/
package org.eclipse.ui.forms.events;
/**
 * Classes that implement this interface will be notified before and after the
 * expandable control's expansion state changes.
 * 
 * @since 3.0
 */
public interface IExpansionListener {
	/**
	 * Notifies the listener that the expandable control is about to change its
	 * expansion state. The state provided by the event is the new state.
	 * 
	 * @param e
	 *            the expansion event
	 */
	void expansionStateChanging(ExpansionEvent e);
	/**
	 * Notifies the listener after the expandable control has changed its
	 * expansion state. The state provided by the event is the new state.
	 * 
	 * @param e
	 *            the expansion event
	 */
	void expansionStateChanged(ExpansionEvent e);
}