/*
 * @(#)ListSelectionEvent.java	1.23 06/07/11
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.swing.event;

import java.util.EventObject;
import javax.swing.*;


/** 
 * An event that characterizes a change in selection. The change is limited to a
 * a single inclusive interval. The selection of at least one index within the
 * range will have changed. A decent {@code ListSelectionModel} implementation
 * will keep the range as small as possible. {@code ListSelectionListeners} will
 * generally query the source of the event for the new selected status of each
 * potentially changed row.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans<sup><font size="-2">TM</font></sup>
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @version 1.23 07/11/06
 * @author Hans Muller
 * @author Ray Ryan
 * @see ListSelectionModel
 */
public class ListSelectionEvent extends EventObject
{
    private int firstIndex;
    private int lastIndex;
    private boolean isAdjusting;

    /** 
     * Represents a change in selection status between {@code firstIndex} and
     * {@code lastIndex}, inclusive. {@code firstIndex} is less than or equal to
     * {@code lastIndex}. The selection of at least one index within the range will
     * have changed. 
     * 
     * @param firstIndex the first index in the range, <= lastIndex
     * @param lastIndex the last index in the range, >= firstIndex
     * @param isAdjusting whether or not this is one in a series of
     *        multiple events, where changes are still being made
     */
    public ListSelectionEvent(Object source, int firstIndex, int lastIndex,
			      boolean isAdjusting)
    {
	super(source);
	this.firstIndex = firstIndex;
	this.lastIndex = lastIndex;
	this.isAdjusting = isAdjusting;
    }

    /**
     * Returns the index of the first row whose selection may have changed.
     * {@code getFirstIndex() <= getLastIndex()}
     *
     * @return the first row whose selection value may have changed,
     *         where zero is the first row
     */
    public int getFirstIndex() { return firstIndex; }

    /**
     * Returns the index of the last row whose selection may have changed.
     * {@code getLastIndex() >= getFirstIndex()}
     *
     * @return the last row whose selection value may have changed,
     *         where zero is the first row
     */
    public int getLastIndex() { return lastIndex; }

    /**
     * Returns whether or not this is one in a series of multiple events,
     * where changes are still being made. See the documentation for
     * {@link javax.swing.ListSelectionModel#setValueIsAdjusting} for
     * more details on how this is used.
     *
     * @return {@code true} if this is one in a series of multiple events,
     *         where changes are still being made
     */
    public boolean getValueIsAdjusting() { return isAdjusting; }

    /**
     * Returns a {@code String} that displays and identifies this
     * object's properties.
     *
     * @return a String representation of this object
     */
    public String toString() {
	String properties = 
	    " source=" + getSource() +  
            " firstIndex= " + firstIndex + 
            " lastIndex= " + lastIndex + 
	    " isAdjusting= " + isAdjusting +
            " ";
        return getClass().getName() + "[" + properties + "]";
    }
}