/* ListSelectionEvent.java --
   Copyright (C) 2002, 2006, Free Software Foundation, Inc.

This file is part of GNU Classpath.

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it under the terms of the GNU General Public License as published by
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General Public License for more details.

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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
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package javax.swing.event;

import java.util.EventObject;

import javax.swing.ListSelectionModel;

/**
 * An event that indicates a change to a list selection, including the source
 * of the change (a {@link ListSelectionModel}) and the range of items in the
 * list that have potentially changed their selection status.
 * 
 * @author Andrew Selkirk
 * @author Ronald Veldema
 */
public class ListSelectionEvent extends EventObject 
{

  /** 
   * The index of the first list item in the range of items that has 
   * potentially had its selection status modified. 
   */
  private int firstIndex = 0;

  /** 
   * The index of the last list item in the range of items that has 
   * potentially had its selection status modified. 
   */
  private int lastIndex = 0;

  /** A flag that indicates that this event is one in a series of events. */
  private boolean isAdjusting = false;

  /**
   * Creates a new <code>ListSelectionEvent</code>.
   * 
   * @param source  the event source (<code>null</code> not permitted).
   * @param firstIndex  the first index.
   * @param lastIndex  the last index.
   * @param isAdjusting  a flag indicating that this event is one in a series 
   *                     of events updating a selection.
   * 
   * @throws IllegalArgumentException if <code>source</code> is 
   *         <code>null</code>.
   */
  public ListSelectionEvent(Object source, int firstIndex,
      int lastIndex, boolean isAdjusting) 
  {
    super(source);
    this.firstIndex = firstIndex;
    this.lastIndex = lastIndex;
    this.isAdjusting = isAdjusting;
  }
 
  /**
   * Returns the first index.
   * 
   * @return The first index.
   */
  public int getFirstIndex() 
  {
    return firstIndex;
  }

  /**
   * Returns the last index.
   * 
   * @return The last index.
   */
  public int getLastIndex() 
  {
    return lastIndex;
  }

  /**
   * Returns the flag that indicates that this event is one in a series of 
   * events updating a selection.
   * 
   * @return A boolean.
   */
  public boolean getValueIsAdjusting() 
  {
    return isAdjusting;
  }

  /**
   * Returns a string representation of the event, typically used for debugging
   * purposes.
   * 
   * @return A string representation of the event.
   */
  public String toString() 
  {
    return this.getClass().toString() + "[ source=" + source.toString() 
        + " firstIndex= " + firstIndex + " lastIndex= " + lastIndex 
        + " isAdjusting= " + isAdjusting + " ]";
  }

}