Name: dbT83986 Date: 12/18/98


Hello,

I'm using JDK v1.2b4 on WinNT v4.0, SP3.

There's a subtle problem with the behavior of the "default" button under
the Windows LaF. I've included a short sample program to illustrate the
behavior. By "default" button I'm referring to the parameter to the
method, JRootPane.setDefaultButton(JButton).

When you press a default button in Windows (here I mean the Windows OS,
not the Swing Windows LaF), the button is activated as soon as the ENTER
key is pressed (i.e., before the key is released). Open any (native)
dialog in Windows that has a default button and press the ENTER key.
You'll see that as soon as the key is pressed the default button is
activated.

Under the Swing Windows LaF, however, the default button is not
activated until after the ENTER key is *released*. This behavior is
not consistent with true Windows behavior.

Regards.

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


class Tester
{
   public static void main(String[] args)
   {
      final JFrame f = new JFrame();

      // WindowListener for main frame window.
      f.addWindowListener(new WindowAdapter()
      {
         public void windowClosing(WindowEvent evt)
         {
            evt.getWindow().dispose();
            System.exit(0);
         }
      });

      JButton button = new JButton("Howdy Ho");
      f.getContentPane().add(button, BorderLayout.NORTH);
      button.addActionListener(new ActionListener()
      {
         public void actionPerformed(ActionEvent evt)
         {
            System.out.println("**** Button was pressed ****");
         }
      });
      
      f.getRootPane().setDefaultButton(button);

      //--------------------
      // The remaining code simply allows for a change in the LaF....
      //--------------------
      JPanel LaFPanel = new JPanel();

      final JButton windowsLaF = new JButton("Windows"),
                    motifLaF = new JButton("Motif"),
                    metalLaF = new JButton("Metal");

      LaFPanel.add(windowsLaF);
      LaFPanel.add(motifLaF);
      LaFPanel.add(metalLaF);

      ActionListener LaFListener = new ActionListener()
      {
         public void actionPerformed(ActionEvent evt)
         {
            Object src = evt.getSource();

            try
            {
               if(src == windowsLaF)
                  UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
               else if(src == motifLaF)
       UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
               else
       UIManager.setLookAndFeel("com.sun.java.swing.plaf.metal.MetalLookAndFeel");

               SwingUtilities.updateComponentTreeUI(f);
            }
            catch(Exception e)
            {
               System.err.println("*** ERROR IN CHANGING LAF: " + e);
            }
         }
      };

      windowsLaF.addActionListener(LaFListener);
      motifLaF.addActionListener(LaFListener);
      metalLaF.addActionListener(LaFListener);

      f.getContentPane().add(LaFPanel, BorderLayout.SOUTH);
      f.setBounds(50, 50, 300, 300);
      f.setVisible(true);
   }
}
(Review ID: 37015)
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