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/*
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* Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package java.awt.event;
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import java.util.EventListener;
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/**
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* The listener interface for receiving <code>WindowEvents</code>, including
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* <code>WINDOW_GAINED_FOCUS</code> and <code>WINDOW_LOST_FOCUS</code> events.
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* The class that is interested in processing a <code>WindowEvent</code>
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* either implements this interface (and
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* all the methods it contains) or extends the abstract
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* <code>WindowAdapter</code> class (overriding only the methods of interest).
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* The listener object created from that class is then registered with a
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* <code>Window</code>
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* using the <code>Window</code>'s <code>addWindowFocusListener</code> method.
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* When the <code>Window</code>'s
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* status changes by virtue of it being opened, closed, activated, deactivated,
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* iconified, or deiconified, or by focus being transfered into or out of the
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* <code>Window</code>, the relevant method in the listener object is invoked,
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* and the <code>WindowEvent</code> is passed to it.
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*
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* @author David Mendenhall
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*
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* @see WindowAdapter
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* @see WindowEvent
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* @see <a href="http://java.sun.com/docs/books/tutorial/post1.0/ui/windowlistener.html">Tutorial: Writing a Window Listener</a>
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*
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* @since 1.4
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*/
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public interface WindowFocusListener extends EventListener {
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/**
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* Invoked when the Window is set to be the focused Window, which means
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* that the Window, or one of its subcomponents, will receive keyboard
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* events.
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*/
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public void windowGainedFocus(WindowEvent e);
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/**
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* Invoked when the Window is no longer the focused Window, which means
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* that keyboard events will no longer be delivered to the Window or any of
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* its subcomponents.
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*/
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public void windowLostFocus(WindowEvent e);
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}
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