📄 focustraversaldemo.java

📁 Java样例程序集合：2D
💻 JAVA
字号:
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 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;        }    }}
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -