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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 in the LICENSE file that
* accompanied this code).
*
* 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.
*
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package java.awt.event;
import java.util.EventListener;
/**
* The listener interface for receiving WindowEvents
, including
* WINDOW_GAINED_FOCUS
and WINDOW_LOST_FOCUS
events.
* The class that is interested in processing a WindowEvent
* either implements this interface (and
* all the methods it contains) or extends the abstract
* WindowAdapter
class (overriding only the methods of interest).
* The listener object created from that class is then registered with a
* Window
* using the Window
's addWindowFocusListener
method.
* When the Window
'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
* Window
, the relevant method in the listener object is invoked,
* and the WindowEvent
is passed to it.
*
* @author David Mendenhall
*
* @see WindowAdapter
* @see WindowEvent
* @see Tutorial: Writing a Window Listener
*
* @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);
}