JTextPane - Need to override TAB insert for traversal

Question

I am using the JTextPane for HTML support. I want the TAB key to default to traversing components instead of inserting tabs or spaces. For JTable and JTextArea I was able to clear the focus traversal keys and they correctly defaulted to the standard component method (i.e., Tab traverses components)
setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, null);
setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, null);
This works for JTextPane when using plain content ("text/plain") but not HTML content ("text/html"). I assume it is because of the default editor that is installed in each case, but i can not figure out how to change the behavior or the editor (e.g., HTMLEditorKit).
Any help would be geatly appreciated.

Answer 1

I did a quick test using method 1 on a JTextPane without HTML and it seemed to work. I'll let you test it when it's using the HTMLEditorKit:
     This example shows two different approaches for tabbing out of a JTextArea
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
public class TextAreaTab extends JFrame
     public TextAreaTab()
          //  Replace the Tab Actions (this is the solution I prefer)
          JTextArea textArea1 = new JTextArea(5, 30);
          textArea1.setText("1\n1\n3\n4\n5\n6\n7\n8\n9");
          JScrollPane scrollPane1 = new JScrollPane( textArea1 );
          getContentPane().add(scrollPane1, BorderLayout.NORTH);
          InputMap im = textArea1.getInputMap();
          KeyStroke tab = KeyStroke.getKeyStroke("TAB");
          textArea1.getActionMap().put(im.get(tab), new TabAction(true));
          KeyStroke shiftTab = KeyStroke.getKeyStroke("shift TAB");
          im.put(shiftTab, shiftTab);
          textArea1.getActionMap().put(im.get(shiftTab), new TabAction(false));
          // Reset the FocusManager
          JTextArea textArea2 = new JTextArea(5, 30);
          textArea2.setText("2\n2\n3\n4\n5\n6\n7\n8\n9");
          JScrollPane scrollPane2 = new JScrollPane( textArea2 );
          getContentPane().add(scrollPane2, BorderLayout.SOUTH);
          textArea2.setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, null);
          textArea2.setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, null);
          // (we don't want the scroll bar to receive focus)
          scrollPane2.getVerticalScrollBar().setFocusable(false); // for tabbing forwards
          scrollPane1.getVerticalScrollBar().setFocusable(false); // for tabbing backwards
     class TabAction extends AbstractAction
          private boolean forward;
          public TabAction(boolean forward)
               this.forward = forward;
          public void actionPerformed(ActionEvent e)
               if (forward)
                    tabForward();
               else
                    tabBackward();
          private void tabForward()
               final KeyboardFocusManager manager =
                    KeyboardFocusManager.getCurrentKeyboardFocusManager();
               manager.focusNextComponent();
               SwingUtilities.invokeLater(new Runnable()
                    public void run()
                         if (manager.getFocusOwner() instanceof JScrollBar)
                              manager.focusNextComponent();
          private void tabBackward()
               final KeyboardFocusManager manager =
                    KeyboardFocusManager.getCurrentKeyboardFocusManager();
               manager.focusPreviousComponent();
               SwingUtilities.invokeLater(new Runnable()
                    public void run()
                         if (manager.getFocusOwner() instanceof JScrollBar)
                              manager.focusPreviousComponent();
     public static void main(String[] args)
          TextAreaTab frame = new TextAreaTab();
          frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
          frame.pack();
          frame.setLocationRelativeTo(null);
          frame.setVisible(true);
}