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 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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 */
package java.awt;

import java.awt.event.KeyEvent;


/**
 * A KeyEventPostProcessor cooperates with the current KeyboardFocusManager
 * in the final resolution of all unconsumed KeyEvents. KeyEventPostProcessors
 * registered with the current KeyboardFocusManager will receive KeyEvents
 * after the KeyEvents have been dispatched to and handled by their targets.
 * KeyEvents that would have been otherwise discarded because no Component in
 * the application currently owns the focus will also be forwarded to
 * registered KeyEventPostProcessors. This will allow applications to implement
 * features that require global KeyEvent post-handling, such as menu shortcuts.
 * <p>
 * Note that the KeyboardFocusManager itself implements KeyEventPostProcessor.
 * By default, the current KeyboardFocusManager will be the final
 * KeyEventPostProcessor in the chain. The current KeyboardFocusManager cannot
 * be completely deregistered as a KeyEventPostProcessor. However, if a
 * KeyEventPostProcessor reports that no further post-processing of the
 * KeyEvent should take place, the AWT will consider the event fully handled
 * and will take no additional action with regard to the event. (While it is
 * possible for client code to register the current KeyboardFocusManager as
 * a KeyEventPostProcessor one or more times, this is usually unnecessary and
 * not recommended.)
 *
 * @author David Mendenhall
 *
 * @see KeyboardFocusManager#addKeyEventPostProcessor
 * @see KeyboardFocusManager#removeKeyEventPostProcessor
 * @since 1.4
 */
@FunctionalInterface
public interface KeyEventPostProcessor {

 /**
 * This method is called by the current KeyboardFocusManager, requesting
 * that this KeyEventPostProcessor perform any necessary post-processing
 * which should be part of the KeyEvent's final resolution. At the time
 * this method is invoked, typically the KeyEvent has already been
 * dispatched to and handled by its target. However, if no Component in
 * the application currently owns the focus, then the KeyEvent has not
 * been dispatched to any Component. Typically, KeyEvent post-processing
 * will be used to implement features which require global KeyEvent
 * post-handling, such as menu shortcuts. Note that if a
 * KeyEventPostProcessor wishes to dispatch the KeyEvent, it must use
 * <code>redispatchEvent</code> to prevent the AWT from recursively
 * requesting that this KeyEventPostProcessor perform post-processing
 * of the event again.
 * <p>
 * If an implementation of this method returns <code>false</code>, then the
 * KeyEvent is passed to the next KeyEventPostProcessor in the chain,
 * ending with the current KeyboardFocusManager. If an implementation
 * returns <code>true</code>, the KeyEvent is assumed to have been fully
 * handled (although this need not be the case), and the AWT will take no
 * further action with regard to the KeyEvent. If an implementation
 * consumes the KeyEvent but returns <code>false</code>, the consumed
 * event will still be passed to the next KeyEventPostProcessor in the
 * chain. It is important for developers to check whether the KeyEvent has
 * been consumed before performing any post-processing of the KeyEvent. By
 * default, the current KeyboardFocusManager will perform no post-
 * processing in response to a consumed KeyEvent.
 *
 * @param e the KeyEvent to post-process
 * @return <code>true</code> if the AWT should take no further action with
 * regard to the KeyEvent; <code>false</code> otherwise
 * @see KeyboardFocusManager#redispatchEvent
 */
 boolean postProcessKeyEvent(KeyEvent e);
}