import java.awt.*;import java.util.*;import java.awt.event.*;import javax.swing.*;public class textareaTab extends Jframe{ public textareaTab() { Container contentPane = getContentPane(); contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS)); contentPane.add( nullTraversalKeys() ); contentPane.add( writeYourOwnAction() ); contentPane.add( useKeyListener() ); contentPane.add( addTraversalKeys() ); } // Reset the text area to use the default tab keys. // This is probably the best solution. private JComponent nullTraversalKeys() { Jtextarea textarea = new Jtextarea(3, 30); textarea.setText("Null Traversal Keysn2n3n4n5n6n7n8n9"); JScrollPane scrollPane = new JScrollPane( textarea );// scrollPane.getVerticalScrollBar().setFocusable(false); textarea.setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, null); textarea.setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, null); return scrollPane; } // Replace the Tab Actions. A little more complicated but this is the // only solution that will place focus on the component, not the // vertical scroll bar, when tabbing backwards (unless of course you // have manually prevented the scroll bar from getting focus). private JComponent writeYourOwnAction() { Jtextarea textarea = new Jtextarea(3, 30); textarea.setText("Write Your Own Tab Actionsn2n3n4n5n6n7n8n9"); JScrollPane scrollPane = new JScrollPane( textarea ); InputMap im = textarea.getInputMap(); KeyStroke tab = KeyStroke.getKeyStroke("TAB"); textarea.getActionMap().put(im.get(tab), new TabAction(true)); KeyStroke shiftTab = KeyStroke.getKeyStroke("shift TAB"); im.put(shiftTab, shiftTab); textarea.getActionMap().put(im.get(shiftTab), new TabAction(false)); return scrollPane; } // Use a KeyListener private JComponent useKeyListener() { Jtextarea textarea = new Jtextarea(3, 30); textarea.setText("Use Key Listenern2n3n4n5n6n7n8n9"); JScrollPane scrollPane = new JScrollPane( textarea ); scrollPane.getVerticalScrollBar().setFocusable(false); textarea.addKeyListener(new KeyAdapter() { public void keyPressed(KeyEvent e) { if (e.getKeyCode() == KeyEvent.VK_TAB) { e.consume(); KeyboardFocusManager. getCurrentKeyboardFocusManager().focusNextComponent(); } if (e.getKeyCode() == KeyEvent.VK_TAB && e.isShiftDown()) { e.consume(); KeyboardFocusManager. getCurrentKeyboardFocusManager().focusPreviousComponent(); } } }); return scrollPane; } // Add Tab and Shift-Tab KeyStrokes back as focus traversal keys. // Seems more complicated then just using null, but at least // it shows how to add a KeyStroke as a focus traversal key. private JComponent addTraversalKeys() { Jtextarea textarea = new Jtextarea(3, 30); textarea.setText("Add Traversal Keysn2n3n4n5n6n7n8n9"); JScrollPane scrollPane = new JScrollPane( textarea ); scrollPane.getVerticalScrollBar().setFocusable(false); Set set = new HashSet( textarea.getFocusTraversalKeys( KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS ) ); set.add( KeyStroke.getKeyStroke( "TAB" ) ); textarea.setFocusTraversalKeys( KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, set ); set = new HashSet( textarea.getFocusTraversalKeys( KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS ) ); set.add( KeyStroke.getKeyStroke( "shift TAB" ) ); textarea.setFocusTraversalKeys( KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, set ); return scrollPane; } 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); }}
