selectionmodelevent.java

java实现浏览器等本地桌面的功能

/*
 * $Id: SelectionModelEvent.java,v 1.3 2005/10/10 17:01:05 rbair Exp $
 *
 * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.jdesktop.binding;

import java.util.EventObject;

/**
 * Event for tracking changes in the selected rows in a SelectionModel
 * @author Richard Bair
 */
public class SelectionModelEvent extends EventObject {
	/**
	 * The first index in the range of indexes. Must be >= 0.
	 */
	private int firstIndex;
	/**
	 * The last index in the range of indexes. firstIndex<=lastIndex
	 */
	private int lastIndex;
	
	/**
	 * Create a new SelectionModelEvent. The range between firstIndex and lastIndex
	 * inclusive (firstIndex is less than or equal to lastIndex) represents a change
	 * in selection state of those rows. At least one of the rows within the range
	 * will have changed. A good SelectionModel implementation will keep the range
	 * as small as possible.
	 * @param source the SelectionModel that fired this event
	 * @param firstIndex the first index that changed
	 * @param lastIndex the last index that changed, lastIndex >= firstIndex
	 */
	public SelectionModelEvent(SelectionModel source, int firstIndex, int lastIndex) {
		super(source);
		assert(firstIndex <= lastIndex);
		assert(firstIndex >= -1);
		this.firstIndex = firstIndex;
		this.lastIndex = lastIndex;
	}
	
	/**
	 * @return the first row whose selection value may have changed, where zero is the
	 * first row
	 */
	public int getFirstIndex() {
		return firstIndex;
	}
	
	/**
	 * @return the last row whose selection value may have changed, where zero is the
	 * last row
	 */
	public int getLastIndex() {
		return lastIndex;
	}
}