Java tutorial
/* * Copyright (c) 1995 - 2008 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: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions 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 nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ 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 java.util.Vector; 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; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; /* * FocusTraversalDemo.java requires no other files. */ public class FocusTraversalDemo extends JPanel implements ActionListener { static JFrame frame; JLabel label; JCheckBox togglePolicy; static MyOwnFocusTraversalPolicy newPolicy; public FocusTraversalDemo() { super(new BorderLayout()); JTextField tf1 = new JTextField("Field 1"); JTextField tf2 = new JTextField("A Bigger Field 2"); JTextField tf3 = new JTextField("Field 3"); JTextField tf4 = new JTextField("A Bigger Field 4"); JTextField tf5 = new JTextField("Field 5"); JTextField tf6 = new JTextField("A Bigger Field 6"); JTable 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.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)); Vector<Component> order = new Vector<Component>(7); order.add(tf1); order.add(tf2); order.add(tf3); order.add(tf4); order.add(tf5); order.add(tf6); order.add(table); newPolicy = new MyOwnFocusTraversalPolicy(order); } // 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) { /* Use an appropriate Look and Feel */ try { // UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); // UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel"); UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel"); } catch (UnsupportedLookAndFeelException ex) { ex.printStackTrace(); } catch (IllegalAccessException ex) { ex.printStackTrace(); } catch (InstantiationException ex) { ex.printStackTrace(); } catch (ClassNotFoundException ex) { ex.printStackTrace(); } /* Turn off metal's use of bold fonts */ UIManager.put("swing.boldMetal", Boolean.FALSE); // 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 static class MyOwnFocusTraversalPolicy extends FocusTraversalPolicy { Vector<Component> order; public MyOwnFocusTraversalPolicy(Vector<Component> order) { this.order = new Vector<Component>(order.size()); this.order.addAll(order); } public Component getComponentAfter(Container focusCycleRoot, Component aComponent) { int idx = (order.indexOf(aComponent) + 1) % order.size(); return order.get(idx); } public Component getComponentBefore(Container focusCycleRoot, Component aComponent) { int idx = order.indexOf(aComponent) - 1; if (idx < 0) { idx = order.size() - 1; } return order.get(idx); } public Component getDefaultComponent(Container focusCycleRoot) { return order.get(0); } public Component getLastComponent(Container focusCycleRoot) { return order.lastElement(); } public Component getFirstComponent(Container focusCycleRoot) { return order.get(0); } } }