/*
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
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
* @version 1.5, 01/23/03
*
* @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>
* @see <a href="http://www.awl.com/cp/javaseries/jcl1_2.html">Reference: The Java Class Libraries (update file)</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);
}