Java tutorial
/* From http://java.sun.com/docs/books/tutorial/index.html */ /* * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * -Redistribution of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * -Redistribution in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of Sun Microsystems, Inc. or the names of contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * This software is provided "AS IS," without a warranty of any kind. ALL * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * * You acknowledge that this software is not designed, licensed or intended * for use in the design, construction, operation or maintenance of any * nuclear facility. */ 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; } } }