edu.uci.ics.jung.visualization.picking.AbstractPickedState Maven / Gradle / Ivy

Go to download
/*
 * Copyright (c) 2005, The JUNG Authors
 * All rights reserved.
 *
 * This software is open-source under the BSD license; see either "license.txt"
 * or https://github.com/jrtom/jung/blob/master/LICENSE for a description.
 *
 *
 * Created on Apr 2, 2005
 */
package edu.uci.ics.jung.visualization.picking;

import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.event.EventListenerList;

/**
 * An abstract class to support ItemEvents for PickedState
 *
 * @author Tom Nelson
 */
public abstract class AbstractPickedState implements PickedState {

  protected EventListenerList listenerList = new EventListenerList();

  public void addItemListener(ItemListener l) {
    listenerList.add(ItemListener.class, l);
  }

  public void removeItemListener(ItemListener l) {
    listenerList.remove(ItemListener.class, l);
  }

  protected void fireItemStateChanged(ItemEvent e) {
    Object[] listeners = listenerList.getListenerList();
    for (int i = listeners.length - 2; i >= 0; i -= 2) {
      if (listeners[i] == ItemListener.class) {
        ((ItemListener) listeners[i + 1]).itemStateChanged(e);
      }
    }
  }
}