📄 focustraversaldemo.java

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/* * 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. */ package misc;import java.awt.*;import java.awt.event.*;import java.util.Vector;import javax.swing.*;/* * 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.<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));        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);        }    }}
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