Name: mc57594 Date: 11/15/99


I tested the following case with JDK 1.2.2 and JDK 1.3 beta.
I'm running Korean version of Windows NT SP5, so Korean input
method may be related to this bug.

Let me explain how to reproduce the problem:

1. Launch Metalworks example included in JDK.
2. By selecting File/New in the menu, launch two or more
   message windows(JInternalFrames)
3. Type something into one of text components
4. Activate other JInternalFrame than the one having the text
   component in step 3, then reactivate the original one
5. Then try to type in anything you want
6. Because no key typed events are generated, nothing appears
   on the text component.

The above bug is caused by input method not enabled when
a component is removed and then added again. As you know,
bringing a JInternalFrame to front in JDesktopPane needs
removing and adding the JInternalFrame.

I don't know the exact cause, but narrowed down the bug
into remove/add. This is not limited to JInternalFrame case.
I checked other cases as well. Also I found a workaround,
so think it will be helpful to you.

And saying about the JDK 1.3 beta, it fixes the problem
only partly. In the case of JTextField in JDK 1.3 beta,
after the steps described above, return key still doesn't work
properly even though other normal keys are recognized
by JTextField.

Calling the following sequence only fixes normal keys, not
return keys:

enableInputMethods(false);
enableInputMethods(true);

The above code posts a focus gained event to InputContext.
But doesn't fix the problem.

The input method is repaired when focus goes to other
Frame(not JInternalFrame) and then returns to the original
one. A work around I suggested only emulates the effect.
Please see my suggestion.
(Review ID: 96822)
======================================================================

Below is a test case that demonstrates the bug more clearly.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Test {

    public static void main(String[] argv) {
        final JFrame frame = new JFrame();
        final JDesktopPane dpane = new JDesktopPane();
        frame.getContentPane().add(dpane);
        final JInternalFrame iframe = new JInternalFrame();
        final JInternalFrame iframe1 = new JInternalFrame();
        JTextField field = new JTextField();
        iframe.getContentPane().add(field);
        field.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.out.println("Return");
            }
        });
        iframe.setResizable(true);
        iframe.setBounds(10, 10, 300, 300);
        iframe1.setBounds(40, 40, 330, 330);
        dpane.add(iframe);
        dpane.add(iframe1);
        iframe1.setVisible(true);
        iframe.setVisible(true);
        frame.setBounds(100, 100, 500, 500);
        frame.setVisible(true);
    }
}