/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Sun Microsystems nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package events;/** KeyEventDemo*/import java.awt.BorderLayout;import java.awt.Container;import java.awt.Dimension;import java.awt.event.*;import javax.swing.*;public class KeyEventDemo extends JFrame        implements KeyListener,        ActionListener{    JTextArea displayArea;    JTextField typingArea;    static final String newline = System.getProperty("line.separator");        public static void main(String[] args) {        /* Use an appropriate Look and Feel */        try {            //UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");            //UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel");            UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");        } catch (UnsupportedLookAndFeelException ex) {            ex.printStackTrace();        } catch (IllegalAccessException ex) {            ex.printStackTrace();        } catch (InstantiationException ex) {            ex.printStackTrace();        } catch (ClassNotFoundException ex) {            ex.printStackTrace();        }        /* Turn off metal's use of bold fonts */        UIManager.put("swing.boldMetal", Boolean.FALSE);                //Schedule a job for event dispatch thread:        //creating and showing this application's GUI.        javax.swing.SwingUtilities.invokeLater(new Runnable() {            public void run() {                createAndShowGUI();            }        });    }        /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event-dispatching thread.     */    private static void createAndShowGUI() {        //Create and set up the window.        KeyEventDemo frame = new KeyEventDemo("KeyEventDemo");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);                //Set up the content pane.        frame.addComponentsToPane();                        //Display the window.        frame.pack();        frame.setVisible(true);    }        private void addComponentsToPane() {                JButton button = new JButton("Clear");        button.addActionListener(this);                typingArea = new JTextField(20);        typingArea.addKeyListener(this);                //Uncomment this if you wish to turn off focus        //traversal.  The focus subsystem consumes        //focus traversal keys, such as Tab and Shift Tab.        //If you uncomment the following line of code, this        //disables focus traversal and the Tab events will        //become available to the key event listener.        //typingArea.setFocusTraversalKeysEnabled(false);                displayArea = new JTextArea();        displayArea.setEditable(false);        JScrollPane scrollPane = new JScrollPane(displayArea);        scrollPane.setPreferredSize(new Dimension(375, 125));                getContentPane().add(typingArea, BorderLayout.PAGE_START);        getContentPane().add(scrollPane, BorderLayout.CENTER);        getContentPane().add(button, BorderLayout.PAGE_END);    }        public KeyEventDemo(String name) {        super(name);    }            /** Handle the key typed event from the text field. */    public void keyTyped(KeyEvent e) {        displayInfo(e, "KEY TYPED: ");    }        /** Handle the key pressed event from the text field. */    public void keyPressed(KeyEvent e) {        displayInfo(e, "KEY PRESSED: ");    }        /** Handle the key released event from the text field. */    public void keyReleased(KeyEvent e) {        displayInfo(e, "KEY RELEASED: ");    }        /** Handle the button click. */    public void actionPerformed(ActionEvent e) {        //Clear the text components.        displayArea.setText("");        typingArea.setText("");                //Return the focus to the typing area.        typingArea.requestFocusInWindow();    }        /*     * We have to jump through some hoops to avoid     * trying to print non-printing characters     * such as Shift.  (Not only do they not print,     * but if you put them in a String, the characters     * afterward won't show up in the text area.)     */    private void displayInfo(KeyEvent e, String keyStatus){                //You should only rely on the key char if the event        //is a key typed event.        int id = e.getID();        String keyString;        if (id == KeyEvent.KEY_TYPED) {            char c = e.getKeyChar();            keyString = "key character = '" + c + "'";        } else {            int keyCode = e.getKeyCode();            keyString = "key code = " + keyCode                    + " ("                    + KeyEvent.getKeyText(keyCode)                    + ")";        }                int modifiersEx = e.getModifiersEx();        String modString = "extended modifiers = " + modifiersEx;        String tmpString = KeyEvent.getModifiersExText(modifiersEx);        if (tmpString.length() > 0) {            modString += " (" + tmpString + ")";        } else {            modString += " (no extended modifiers)";        }                String actionString = "action key? ";        if (e.isActionKey()) {            actionString += "YES";        } else {            actionString += "NO";        }                String locationString = "key location: ";        int location = e.getKeyLocation();        if (location == KeyEvent.KEY_LOCATION_STANDARD) {            locationString += "standard";        } else if (location == KeyEvent.KEY_LOCATION_LEFT) {            locationString += "left";        } else if (location == KeyEvent.KEY_LOCATION_RIGHT) {            locationString += "right";        } else if (location == KeyEvent.KEY_LOCATION_NUMPAD) {            locationString += "numpad";        } else { // (location == KeyEvent.KEY_LOCATION_UNKNOWN)            locationString += "unknown";        }                displayArea.append(keyStatus + newline                + "    " + keyString + newline                + "    " + modString + newline                + "    " + actionString + newline                + "    " + locationString + newline);        displayArea.setCaretPosition(displayArea.getDocument().getLength());    }}