2009-06-04读书记录：《Core Java》第八版卷I之User Interface Components with swing

仍然是补飞Java基础部分，这里就是桌面程序所必须的了，虽然现在大部分主流技术都是用Java写Web程序，但学一下桌面程序自己写个小工具也是挺有趣的。都很基础，练习一下每个程序就差不多了。只是用java写桌面应用真的比较麻烦，没有可视化的form，只能凭自己想像力。

菜单这一节的例子不错，挺全面的，虽然打着有点累，但运行起来效果出来的时候还是不错的。

 

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 *
 * @author Administrator
 */
public class MenuTest {

    public static void main(String[] args){
        EventQueue.invokeLater(new Runnable(){

            public void run() {
                MenuFrame frame = new MenuFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }

        });
    }
}

class MenuFrame extends JFrame {

    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGHT = 200;
    private Action saveAction;
    private Action saveAsAction;
    private JCheckBoxMenuItem readonlyItem;
    private JPopupMenu popup;

    public MenuFrame() {
        setTitle("MenuTest");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        //fileMenu start
        JMenu fileMenu = new JMenu("File");
        fileMenu.add(new TestAction("New"));

        JMenuItem openItem = fileMenu.add(new TestAction("Open"));
        openItem.setAccelerator(KeyStroke.getKeyStroke("ctrl O"));      //设置修改键，它能直接调用菜单项的操作侦听器而不必显示菜单的层次结构。

        fileMenu.addSeparator();    //加入分隔符

        saveAction = new TestAction("Save");
        JMenuItem saveItem = fileMenu.add(saveAction);
        saveItem.setAccelerator(KeyStroke.getKeyStroke("ctrl S"));

        saveAsAction = new TestAction("Save As");
        fileMenu.add(saveAsAction);
        fileMenu.addSeparator();

        JMenuItem exitItem = new JMenuItem("Exit");
        exitItem.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent e) {
                  System.exit(0);
            }
        });
        fileMenu.add(exitItem);
/*
        fileMenu.add(new AbstractAction("Exit") {

            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
 * */
        //fileMenu end

        //editMenu start
        readonlyItem = new JCheckBoxMenuItem("Read-Only");
        readonlyItem.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                boolean saveOk = !readonlyItem.isSelected();
                saveAction.setEnabled(saveOk);
                saveAsAction.setEnabled(saveOk);
            }
        });

        ButtonGroup group = new ButtonGroup();
        JRadioButtonMenuItem insertItem = new JRadioButtonMenuItem("Insert");
        insertItem.setSelected(true);
        JRadioButtonMenuItem overtypeItem = new JRadioButtonMenuItem("Overtype");

        group.add(insertItem);
        group.add(overtypeItem);

        Action cutAction = new TestAction("Cut");
        cutAction.putValue(Action.SMALL_ICON, new ImageIcon("cut.gif"));
        Action copyAction = new TestAction("Copy");
        copyAction.putValue(Action.SMALL_ICON, new ImageIcon("copy.gif"));
        Action pasteAction = new TestAction("Paste");
        pasteAction.putValue(Action.SMALL_ICON, new ImageIcon("paste.gif"));

        JMenu editMenu = new JMenu("Edit");
        editMenu.add(cutAction);
        editMenu.add(copyAction);
        editMenu.add(pasteAction);

        JMenu optionMenu = new JMenu("Option");
        optionMenu.add(readonlyItem);
        optionMenu.addSeparator();
        optionMenu.add(insertItem);
        optionMenu.add(overtypeItem);

        editMenu.addSeparator();
        editMenu.add(optionMenu);
        //editMenu end

        //helpMenu start
        JMenu helpMenu = new JMenu("Help");
        helpMenu.setMnemonic('H');                      //设置助记符
        JMenuItem indexItem = new JMenuItem("Index");
        indexItem.setMnemonic('I');
        helpMenu.add(indexItem);

        Action aboutAction = new TestAction("About");
        aboutAction.putValue(Action.MNEMONIC_KEY, new Integer('A'));        //使用关联的键设置此对象的一个属性。如果值发生了更改，则将一个 PropertyChangeEvent 发送到侦听器
        helpMenu.add(aboutAction);
        //helpMenu end

        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);

        menuBar.add(fileMenu);
        menuBar.add(editMenu);
        menuBar.add(helpMenu);

        popup = new JPopupMenu();
        popup.add(cutAction);
        popup.add(copyAction);
        popup.add(pasteAction);

        JPanel panel = new JPanel();
        panel.setComponentPopupMenu(popup);
        add(panel);
        panel.addMouseListener(new MouseListener() {

            public void mouseClicked(MouseEvent e) {
                throw new UnsupportedOperationException("Not supported yet.");
            }

            public void mousePressed(MouseEvent e) {
                throw new UnsupportedOperationException("Not supported yet.");
            }

            public void mouseReleased(MouseEvent e) {
                throw new UnsupportedOperationException("Not supported yet.");
            }

            public void mouseEntered(MouseEvent e) {
                throw new UnsupportedOperationException("Not supported yet.");
            }

            public void mouseExited(MouseEvent e) {
                throw new UnsupportedOperationException("Not supported yet.");
            }
        });

    }
}

class TestAction extends AbstractAction {

    public TestAction(String name) {
        super(name);
    }

    public void actionPerformed(ActionEvent event) {
        System.out.println(getValue(Action.NAME) + " selected.");
    }
}