/*
 * ControlChangeAdapter.java
 * 
 * Copyright (c) 2003-2004 Digi International
 * This program and the information contained in it is confidential and
 * proprietary to Digi International and may not be used, copied, or re-
 * produced without the prior written permission of Digi International.
 * 
 */

package com.digi.config.ui;

import com.digi.config.core.*;
import com.digi.config.util.*;

import javax.swing.*;
import javax.swing.text.*;
import java.text.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
import java.net.*;




/** 
 * This class combines notification of action events and focus event for
 * listeners who want to use the same handler for both kinds of events.
 * 
 * The abstract method changePerformed must be implemented by subclasses
 * to include the event processing activity.
 */
public abstract class ControlChangeAdapter implements ActionListener, FocusListener {
    /**
     * Invoked when an action occurs.
     */
    public void actionPerformed(ActionEvent e) {
        changePerformed(e.getSource(), e, null);
    }

    /**
     * Invoked when a component gains the keyboard focus.
     */
    public void focusGained(FocusEvent e) {
        // who cares...
    }

    /**
     * Invoked when a component loses the keyboard focus.
     */
    public void focusLost(FocusEvent e) {
        changePerformed(e.getSource(), null, e);
    }

    /**
     * Invoked whenever an action occurs or when a component loses the keyboard focus.
     * This method must be provided by the implementer.
     */
    public abstract void changePerformed(Object source, ActionEvent ae, FocusEvent fe);
}