82 lines
3.6 KiB
Java
82 lines
3.6 KiB
Java
/* KeyEventPostProcessor.java -- performs actions after a key event dispatch
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Copyright (C) 2002, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt;
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import java.awt.event.KeyEvent;
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/**
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* An instance of this interface coordinates with a KeyboardFocusManager to
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* target and dispatch all key events that are otherwise unconsumed. This
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* allows events which take place when nothing has focus to still operate,
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* such as menu keyboard shortcuts.
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*
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* <p>By default, the KeyboardFocusManager is the sink for all key events not
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* post-processed elsewhere. Therefore, it is unnecessary for the user
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* to register the focus manager as a dispatcher.
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*
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* @author Eric Blake (ebb9@email.byu.edu)
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* @see KeyboardFocusManager#addKeyEventPostProcessor(KeyEventPostProcessor)
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* @see KeyboardFocusManager#removeKeyEventPostProcessor(KeyEventPostProcessor)
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* @since 1.4
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* @status updated to 1.4
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*/
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public interface KeyEventPostProcessor
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{
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/**
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* Called by the KeyboardFocusManager to request that a key event be
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* post-processed. Typically, the event has already been dispatched and
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* handled, unless no object has focus. Thus, this allows global event
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* handling for things like menu shortcuts. If this post-processor chooses
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* to dispatch the event, it should call <code>redispatchEvent</code>
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* to avoid infinite recursion.
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*
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* <p>If the return value is false, the KeyEvent is passed to the next
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* dispatcher in the chain, ending with the KeyboardFocusManager. If the
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* return value is true, the event has been consumed (although it might
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* have been ignored), and no further action will be taken on the event. Be
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* sure to check whether the event was consumed before dispatching it
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* further.
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*
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* @param e the key event
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* @return true if the event has been consumed
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* @see KeyboardFocusManager#redispatchEvent(Component, AWTEvent)
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*/
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boolean postProcessKeyEvent(KeyEvent e);
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} // interface KeyEventPostProcessor
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