Source for java.awt.event.FocusListener

   1: /* FocusListener.java -- listen for focus changes
   2:    Copyright (C) 1999, 2002, 2005  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
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  36: exception statement from your version. */
  37: 
  38: 
  39: package java.awt.event;
  40: 
  41: import java.util.EventListener;
  42: 
  43: /**
  44:  * This interface is for classes that wish to be notified of changes of
  45:  * keyboard focus for a component. To watch a subset of these events, use a
  46:  * FocusAdapter.
  47:  *
  48:  * @author Aaron M. Renn (arenn@urbanophile.com)
  49:  * @see FocusAdapter
  50:  * @see FocusEvent
  51:  * @since 1.1
  52:  * @status updated to 1.4
  53:  */
  54: public interface FocusListener extends EventListener
  55: {
  56:   /**
  57:    * This method is called when a component gains the keyboard focus.
  58:    *
  59:    * @param event the <code>FocusEvent</code> indicating that focus was gained
  60:    */
  61:   void focusGained(FocusEvent event);
  62: 
  63:   /**
  64:    * This method is invoked when a component loses the keyboard focus.
  65:    *
  66:    * @param event the <code>FocusEvent</code> indicating that focus was lost
  67:    */
  68:   void focusLost(FocusEvent event);
  69: } // interface FocusListener