gcc/libjava/java/awt/KeyEventPostProcessor.java

/* KeyEventPostProcessor.java -- performs actions after a key event dispatch
   Copyright (C) 2002 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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any later version.

GNU Classpath 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
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02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
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this exception to your version of the library, but you are not
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exception statement from your version. */


package java.awt;

import java.awt.event.KeyEvent;

/**
 * An instance of this interface coordinates with a KeyboardFocusManager to
 * target and dispatch all key events that are otherwise unconsumed. This
 * allows events which take place when nothing has focus to still operate,
 * such as menu keyboard shortcuts.
 *
 * <p>By default, the KeyboardFocusManager is the sink for all key events not
 * post-processed elsewhere. Therefore, it is unnecessary for the user
 * to register the focus manager as a dispatcher.
 *
 * @author Eric Blake <ebb9@email.byu.edu>
 * @see KeyboardFocusManager#addKeyEventPostProcessor(KeyEventPostProcessor)
 * @see KeyboardFocusManager#removeKeyEventPostProcessor(KeyEventPostProcessor)
 * @since 1.4
 * @status updated to 1.4
 */
public interface KeyEventPostProcessor
{
  /**
   * Called by the KeyboardFocusManager to request that a key event be
   * post-processed. Typically, the event has already been dispatched and
   * handled, unless no object has focus. Thus, this allows global event
   * handling for things like menu shortcuts. If this post-processor chooses
   * to dispatch the event, it should call <code>redispatchEvent</code>
   * to avoid infinite recursion.
   *
   * <p>If the return value is false, the KeyEvent is passed to the next
   * dispatcher in the chain, ending with the KeyboardFocusManager. If the
   * return value is true, the event has been consumed (although it might
   * have been ignored), and no further action will be taken on the event. Be
   * sure to check whether the event was consumed before dispatching it
   * further.
   *
   * @param e the key event
   * @return true if the event has been consumed
   * @see KeyboardFocusManager#redispatchEvent(Component, AWTEvent)
   */
  boolean postProcessKeyEvent(KeyEvent e);
} // interface KeyEventPostProcessor