/*
* Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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package java.awt.event;
import java.util.EventListener;
/**
* The listener interface for receiving <code>WindowEvents</code>, including
* <code>WINDOW_GAINED_FOCUS</code> and <code>WINDOW_LOST_FOCUS</code> events.
* The class that is interested in processing a <code>WindowEvent</code>
* either implements this interface (and
* all the methods it contains) or extends the abstract
* <code>WindowAdapter</code> class (overriding only the methods of interest).
* The listener object created from that class is then registered with a
* <code>Window</code>
* using the <code>Window</code>'s <code>addWindowFocusListener</code> method.
* When the <code>Window</code>'s
* status changes by virtue of it being opened, closed, activated, deactivated,
* iconified, or deiconified, or by focus being transfered into or out of the
* <code>Window</code>, the relevant method in the listener object is invoked,
* and the <code>WindowEvent</code> is passed to it.
*
* @author David Mendenhall
*
* @see WindowAdapter
* @see WindowEvent
* @see <a href="http://java.sun.com/docs/books/tutorial/post1.0/ui/windowlistener.html">Tutorial: Writing a Window Listener</a>
*
* @since 1.4
*/
public interface WindowFocusListener extends EventListener {
/**
* Invoked when the Window is set to be the focused Window, which means
* that the Window, or one of its subcomponents, will receive keyboard
* events.
*/
public void windowGainedFocus(WindowEvent e);
/**
* Invoked when the Window is no longer the focused Window, which means
* that keyboard events will no longer be delivered to the Window or any of
* its subcomponents.
*/
public void windowLostFocus(WindowEvent e);
}