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75 lines
2.7 KiB
Java
75 lines
2.7 KiB
Java
/*
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* Copyright (c) 1996, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.awt.event;
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/**
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* An abstract adapter class for receiving keyboard events.
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* The methods in this class are empty. This class exists as
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* convenience for creating listener objects.
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* <P>
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* Extend this class to create a {@code KeyEvent} listener
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* and override the methods for the events of interest. (If you implement the
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* {@code KeyListener} interface, you have to define all of
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* the methods in it. This abstract class defines null methods for them
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* all, so you can only have to define methods for events you care about.)
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* <P>
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* Create a listener object using the extended class and then register it with
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* a component using the component's {@code addKeyListener}
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* method. When a key is pressed, released, or typed,
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* the relevant method in the listener object is invoked,
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* and the {@code KeyEvent} is passed to it.
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*
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* @author Carl Quinn
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*
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* @see KeyEvent
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* @see KeyListener
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* @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/keylistener.html">Tutorial: Writing a Key Listener</a>
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*
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* @since 1.1
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*/
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public abstract class KeyAdapter implements KeyListener {
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/**
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* Constructs a {@code KeyAdapter}.
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*/
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protected KeyAdapter() {}
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/**
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* Invoked when a key has been typed.
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* This event occurs when a key press is followed by a key release.
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*/
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public void keyTyped(KeyEvent e) {}
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/**
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* Invoked when a key has been pressed.
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*/
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public void keyPressed(KeyEvent e) {}
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/**
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* Invoked when a key has been released.
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*/
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public void keyReleased(KeyEvent e) {}
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}
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