import java.awt.*; import java.awt.event.*; import javax.swing.JComponent; import javax.swing.BorderFactory; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JFrame; import javax.swing.JTextField; import javax.swing.JTable; import javax.swing.JCheckBox; /* * FocusTraversalDemo.java requires no other files. */ public class FocusTraversalDemo extends JPanel implements ActionListener { static JFrame frame; JTextField tf1, tf2, tf3, tf4, tf5, tf6; JTable table; JLabel label; JCheckBox togglePolicy; static MyOwnFocusTraversalPolicy newPolicy; public FocusTraversalDemo() { super(new BorderLayout()); newPolicy = new MyOwnFocusTraversalPolicy(); tf1 = new JTextField("Field 1"); tf2 = new JTextField("A Bigger Field 2"); tf3 = new JTextField("Field 3"); tf4 = new JTextField("A Bigger Field 4"); tf5 = new JTextField("Field 5"); tf6 = new JTextField("A Bigger Field 6"); table = new JTable(4,3); togglePolicy = new JCheckBox("Custom FocusTraversalPolicy"); togglePolicy.setActionCommand("toggle"); togglePolicy.addActionListener(this); togglePolicy.setFocusable(false); //Remove it from the focus cycle. //Note that HTML is allowed and will break this run of text //across two lines. label = new JLabel("Use Tab (or Shift-Tab) to navigate from component to component.

Control-Tab (or Control-Shift-Tab) allows you to break out of the JTable."); JPanel leftTextPanel = new JPanel(new GridLayout(3,2)); leftTextPanel.add(tf1, BorderLayout.PAGE_START); leftTextPanel.add(tf3, BorderLayout.CENTER); leftTextPanel.add(tf5, BorderLayout.PAGE_END); leftTextPanel.setBorder(BorderFactory.createEmptyBorder(0,0,5,5)); JPanel rightTextPanel = new JPanel(new GridLayout(3,2)); rightTextPanel.add(tf2, BorderLayout.PAGE_START); rightTextPanel.add(tf4, BorderLayout.CENTER); rightTextPanel.add(tf6, BorderLayout.PAGE_END); rightTextPanel.setBorder(BorderFactory.createEmptyBorder(0,0,5,5)); JPanel tablePanel = new JPanel(new GridLayout(0,1)); tablePanel.add(table, BorderLayout.CENTER); tablePanel.setBorder(BorderFactory.createEtchedBorder()); JPanel bottomPanel = new JPanel(new GridLayout(2,1)); bottomPanel.add(togglePolicy, BorderLayout.PAGE_START); bottomPanel.add(label, BorderLayout.PAGE_END); add(leftTextPanel, BorderLayout.LINE_START); add(rightTextPanel, BorderLayout.CENTER); add(tablePanel, BorderLayout.LINE_END); add(bottomPanel, BorderLayout.PAGE_END); setBorder(BorderFactory.createEmptyBorder(20,20,20,20)); } //Turn the custom focus traversal policy on/off, //according to the checkbox public void actionPerformed(ActionEvent e) { if ("toggle".equals(e.getActionCommand())) { frame.setFocusTraversalPolicy(togglePolicy.isSelected() ? newPolicy : null); } } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Create and set up the window. frame = new JFrame("FocusTraversalDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. JComponent newContentPane = new FocusTraversalDemo(); newContentPane.setOpaque(true); //content panes must be opaque frame.setContentPane(newContentPane); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } public class MyOwnFocusTraversalPolicy extends FocusTraversalPolicy { public Component getComponentAfter(Container focusCycleRoot, Component aComponent) { if (aComponent.equals(tf1)) { return tf2; } else if (aComponent.equals(tf2)) { return tf3; } else if (aComponent.equals(tf3)) { return tf4; } else if (aComponent.equals(tf4)) { return tf5; } else if (aComponent.equals(tf5)) { return tf6; } else if (aComponent.equals(tf6)) { return table; } else if (aComponent.equals(table)) { return tf1; } return tf1; } public Component getComponentBefore(Container focusCycleRoot, Component aComponent) { if (aComponent.equals(tf1)) { return table; } else if (aComponent.equals(tf2)) { return tf1; } else if (aComponent.equals(tf3)) { return tf2; } else if (aComponent.equals(tf4)) { return tf3; } else if (aComponent.equals(tf5)) { return tf4; } else if (aComponent.equals(tf6)) { return tf5; } else if (aComponent.equals(table)) { return tf6; } return tf1; } public Component getDefaultComponent(Container focusCycleRoot) { return tf1; } public Component getLastComponent(Container focusCycleRoot) { return table; } public Component getFirstComponent(Container focusCycleRoot) { return tf1; } } }