Name: dbT83986 Date: 01/05/99


Type in alphabets in the text box
No keyTyped events generated for alphabets
keyTyped events being generated for backspace key though.
Tested on NT

import javax.swing.*;

import java.awt.BorderLayout;
import java.awt.Dimension;

import java.awt.event.*;

public class KeyEventDemo extends JApplet
                          implements KeyListener,
ActionListener {
    JTextArea displayArea;
    JTextField typingArea;
    String newline;

    public void init() {
JButton button = new JButton("Clear");
button.addActionListener(this);

typingArea = new JTextField(20);
typingArea.addKeyListener(this);

displayArea = new JTextArea();
displayArea.setEditable(false);
JScrollPane scrollPane = new JScrollPane(displayArea);
scrollPane.setPreferredSize(new Dimension(375, 125));

JPanel contentPane = new JPanel();
contentPane.setLayout(new BorderLayout());
contentPane.add(typingArea, BorderLayout.NORTH);
contentPane.add(scrollPane, BorderLayout.CENTER);
contentPane.add(button, BorderLayout.SOUTH);
setContentPane(contentPane);

newline = System.getProperty("line.separator");
    }

    /** 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.requestFocus();
    }

    /*
     * 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.)
     */
    protected void displayInfo(KeyEvent e, String s){
String charString, keyCodeString, modString, tmpString;

char c = e.getKeyChar();
int keyCode = e.getKeyCode();
int modifiers = e.getModifiers();

if (Character.isISOControl(c)) {
charString = "key character = (an unprintable control character)";
} else {
charString = "key character = '" + c + "'";
}

keyCodeString = "key code = " + keyCode
+ " ("
+ KeyEvent.getKeyText(keyCode)
+ ")";

modString = "modifiers = " + modifiers;
tmpString = KeyEvent.getKeyModifiersText(modifiers);
if (tmpString.length() > 0) {
modString += " (" + tmpString + ")";
} else {
modString += " (no modifiers)";
}

displayArea.append(s
                           + newline + " "
+ charString
+ newline + " "
+ keyCodeString
+ newline + " "
+ modString
+ newline);
    }
}
(Review ID: 48902)
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