Name: diC59631 Date: 01/14/98


In the AWT it was possible to do 2 things with input key events
that do not work in Swing 0.7 (or earlier versions):

- consume an event. To restrict input to certain chars, one could
do this in a KeyListener:

        public void keyPressed(KeyEvent e) {
            // discard uppr case chars
            if (Character.isUpperCase(e.getKeyChar()) {
                e.consume();
            }
        }

- modify an event. In a KeyListener

        public void keyPressed(KeyEvent e) {
            // map lower case chars to upper
            if (Character.isLowerCase(e.getKeyChar()) {
                e.setKeyChar(Character.toUpperCase(e.getKeyChar()));
                e.setModifiers = Event.SHIFT_MASK;
            }
        }

These do not work for Swing - no changes or consumption occurs.
I suspect that you are drawing the chars and *then* calling the
listeners, rather than calling the listeners, checking event state,
and then drawing.

This works under the AWT:

import java.awt.*;
import java.awt.event.*;

public class MapKey extends Frame {
 
   public static void main(String argv[]) {
        new MapKey().setVisible(true);
    }

    public MapKey() {
        TextField text = new TextField(20);
        add(text);
        pack();

        text.addKeyListener(new ToUpper());
    }
}

class ToUpper implements KeyListener {
    
    public void keyTyped(KeyEvent e) {
        // empty
    }

    public void keyPressed(KeyEvent e) {
        e.setModifiers(Event.SHIFT_MASK);
    }

    public void keyReleased(KeyEvent e) {
        // empty
    }
}

(or we could suppress an event by e.consume())

Change the AWT components to Swing and it no longer works
(Review ID: 23240)
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