| 1 | /* KeyEventPostProcessor.java -- performs actions after a key event dispatch
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| 2 | Copyright (C) 2002 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is part of GNU Classpath.
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| 5 |
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| 6 | GNU Classpath is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2, or (at your option)
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| 9 | any later version.
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| 10 |
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| 11 | GNU Classpath is distributed in the hope that it will be useful, but
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| 12 | WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with GNU Classpath; see the file COPYING. If not, write to the
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| 18 | Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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| 19 | 02111-1307 USA.
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| 20 |
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| 21 | Linking this library statically or dynamically with other modules is
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| 22 | making a combined work based on this library. Thus, the terms and
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| 23 | conditions of the GNU General Public License cover the whole
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| 24 | combination.
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| 25 |
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| 26 | As a special exception, the copyright holders of this library give you
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| 27 | permission to link this library with independent modules to produce an
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| 28 | executable, regardless of the license terms of these independent
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| 29 | modules, and to copy and distribute the resulting executable under
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| 30 | terms of your choice, provided that you also meet, for each linked
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| 31 | independent module, the terms and conditions of the license of that
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| 32 | module. An independent module is a module which is not derived from
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| 33 | or based on this library. If you modify this library, you may extend
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| 34 | this exception to your version of the library, but you are not
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| 35 | obligated to do so. If you do not wish to do so, delete this
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| 36 | exception statement from your version. */
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| 37 |
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| 38 |
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| 39 | package java.awt;
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| 40 |
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| 41 | import java.awt.event.KeyEvent;
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| 42 |
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| 43 | /**
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| 44 | * An instance of this interface coordinates with a KeyboardFocusManager to
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| 45 | * target and dispatch all key events that are otherwise unconsumed. This
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| 46 | * allows events which take place when nothing has focus to still operate,
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| 47 | * such as menu keyboard shortcuts.
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| 48 | *
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| 49 | * <p>By default, the KeyboardFocusManager is the sink for all key events not
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| 50 | * post-processed elsewhere. Therefore, it is unnecessary for the user
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| 51 | * to register the focus manager as a dispatcher.
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| 52 | *
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| 53 | * @author Eric Blake <ebb9@email.byu.edu>
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| 54 | * @see KeyboardFocusManager#addKeyEventPostProcessor(KeyEventPostProcessor)
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| 55 | * @see KeyboardFocusManager#removeKeyEventPostProcessor(KeyEventPostProcessor)
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| 56 | * @since 1.4
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| 57 | * @status updated to 1.4
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| 58 | */
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| 59 | public interface KeyEventPostProcessor
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| 60 | {
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| 61 | /**
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| 62 | * Called by the KeyboardFocusManager to request that a key event be
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| 63 | * post-processed. Typically, the event has already been dispatched and
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| 64 | * handled, unless no object has focus. Thus, this allows global event
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| 65 | * handling for things like menu shortcuts. If this post-processor chooses
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| 66 | * to dispatch the event, it should call <code>redispatchEvent</code>
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| 67 | * to avoid infinite recursion.
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| 68 | *
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| 69 | * <p>If the return value is false, the KeyEvent is passed to the next
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| 70 | * dispatcher in the chain, ending with the KeyboardFocusManager. If the
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| 71 | * return value is true, the event has been consumed (although it might
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| 72 | * have been ignored), and no further action will be taken on the event. Be
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| 73 | * sure to check whether the event was consumed before dispatching it
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| 74 | * further.
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| 75 | *
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| 76 | * @param e the key event
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| 77 | * @return true if the event has been consumed
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| 78 | * @see KeyboardFocusManager#redispatchEvent(Component, AWTEvent)
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| 79 | */
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| 80 | boolean postProcessKeyEvent(KeyEvent e);
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| 81 | } // interface KeyEventPostProcessor
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