Name: joT67522 Date: 10/29/97


I am trying to use the example in /doc/keyboardUI.html (bottom of page)
to add a hotkey to change focus to a JTextField.

According to the example, I registry a keyboard action on the JTextField
as follows:
   JTextField.registerKeyboardAction( ... )
The action listener will then set focus to the JTextField.
This works and the focus is shifted to the JTextField.

The problem is that the key used to invoke the keyboard action is also
passed to the JTextField. So, if I used ALT-a to shift focus, an 'a' also
appears in the JTextField, which shouldn't happen. I think the 'a' should
have been consumed.

I enclosed an example here. Use Alt-a and Alt-b to switch between the two
JTextFields. Alt-c will also switch to the 2nd JTextField.

I added a key listener and a focus listener to the JTextFields and I see
the focus change but not a key event. At the very least, I expected a
key event from the registerKeyboardAction().

______________________________________________

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.Vector;
import java.util.ResourceBundle;
import java.text.MessageFormat;
import java.net.URL;
import java.util.*;
import com.sun.java.swing.*;
import com.sun.java.swing.event.*;
import com.sun.java.swing.text.*;
import com.sun.java.swing.border.*;
import com.sun.java.swing.basic.*;

public class test
{
public static void main ( String argv[] )
{
frm f = new frm();
}
}

class frm extends Frame
{
JLabel label_a;
JLabel label_b;
JTextField text_a;
JTextField text_b;

public frm ()
{
super();
setSize( 500, 500 );

label_a = new JLabel( "Field a" );
label_a.setDisplayedKeyAccelerator( 'a' );

label_b = new JLabel( "Field b" );
label_b.setDisplayedKeyAccelerator( 'b' );

text_a = new JTextField( "", 10 );
text_a.registerKeyboardAction( new SetFocus( text_a, "Field a" ),
KeyStroke.getKeyStroke( 'a', InputEvent.ALT_MASK ),
JComponent.WHEN_IN_FOCUSED_WINDOW );
text_a.addKeyListener( new KeyL( "Field a" ) );
text_a.addFocusListener( new FocusL( "Field a" ) );


text_b = new JTextField( "", 10 );
text_b.registerKeyboardAction( new SetFocus( text_b, "Field b" ),
KeyStroke.getKeyStroke( 'b', InputEvent.ALT_MASK ),
JComponent.WHEN_IN_FOCUSED_WINDOW );
text_b.addKeyListener( new KeyL( "Field b" ) );
text_b.addFocusListener( new FocusL( "Field b" ) );

JPanel panel = new JPanel();
panel.registerKeyboardAction( new SetFocus( text_b, "From panel" ),
KeyStroke.getKeyStroke( 'c', InputEvent.ALT_MASK ),
JComponent.WHEN_IN_FOCUSED_WINDOW );

panel.add( label_a );
panel.add( text_a );

panel.add( label_b );
panel.add( text_b );

add( panel );

pack();
show();
validate();
repaint();
}

private class SetFocus implements ActionListener
{
private JTextField textfield;
private String desc;

public SetFocus ( JTextField jtf, String txt )
{
textfield = jtf;
desc = txt;
}

public void actionPerformed ( ActionEvent e )
{
System.out.println( desc + " - ActionEvent: " + e.paramString() );
textfield.requestFocus();
}
}

private class KeyL extends KeyAdapter
{
private String desc;

public KeyL ( String txt )
{
desc = txt;
}

public void keyPressed ( KeyEvent e )
{
System.out.println( desc + " - KeyEvent: " + e.paramString() );
}
}

private class FocusL extends FocusAdapter
{
private String desc;

public FocusL ( String txt )
{
desc = txt;
}

public void focusGained ( FocusEvent e )
{
System.out.println( desc + " - FocusEvent: " + e.paramString() );
}
}
}
(Review ID: 19487)
======================================================================

JTextField will not consume a KeyEvent. I wrote a Numeric only object based
on JTextField so that the user can only enter numerics 0-9 into it.. When a non
numeric charector is entered the charector or key press is consumed. With
JTextField the consume throws no exceptions but the charector is not consumed
and is then included into the text breaking the control. Whats up?

Basically..the following processKeyEvent would not work as a
KeyListener.keyPressed() function .

Thanks so much for your quick support.

public class MyNumericField extends JTextField
{
MyNumericField( String s )
{
super(s);
}

public void processKeyEvent(KeyEvent e)
{
if( !e.isActionKey())
{
switch(e.getKeyChar())
{
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '\t':
case '\b':
break;

default:
if( e.getKeyCode() !=
KeyEvent.VK_DELETE )
{
// System.out.println(
"MyNumericField was consumed");
e.consume();
return;
}

}
}

super.processKeyEvent( e );
}

}




==========================================
One more licensee wants this bug to be fixed.

=============================================================================

[Another test case verified. joon.oh@Eng 1998-01-09]

Run sample code, request focus by clicking on the text field (cursor
should be blinking in field) Next, activate pull-down menu using
<Alt>-t then activate menu item by pressing 'i' or <Alt>-i. On my
platform, the character 'i' is echoed in the text field. I don't think
this should happen!

This also happens in the SwingSet demo.

I am running an HP Vectra XU 5/75, with 56mb of memory, JDK
1.1.5, Swing-0.7, symcjit

Here is the code:

import java.awt.*;
import java.awt.event.*;
import com.sun.java.swing.*;

public class SimpleExample extends JPanel {
    static JFrame frame;

    public SimpleExample() {

    JMenuBar mb=new JMenuBar();
    JMenu mn=(JMenu)mb.add(new JMenu("Test"));
    mn.setKeyAccelerator('T');
    JMenuItem mi=(JMenuItem)mn.add(new JMenuItem("This"));
    mi.setKeyAccelerator('i');
    add(mb);
    add(new JTextField(10));
    }


    public static void main(String s[]) {
SimpleExample panel = new SimpleExample();

         frame = new JFrame("SimpleExample");
         frame.addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent e) {System.exit(0);}
         });
         frame.getContentPane().add("Center", panel);
         frame.pack();
         frame.setVisible(true);

    }
}