Focus Traversal Demo
Tuesday, June 30th, 2009/* From http://java.sun.com/docs/books/tutorial/index.html */
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import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.FocusTraversalPolicy;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JCheckBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.JTextField;
/*
* FocusTraversalDemo.java is a 1.4 example that 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(
"<html>Use Tab (or Shift-Tab) to navigate from component to component.<p>Control-Tab (or Control-Shift-Tab) allows you to break out of the JTable.</html>");
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() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//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;
}
}
}
