damagereporter.java

这是java2核心技术第七版的源代码

/**
   @version 1.00 2004-08-30
   @author Cay Horstmann
*/

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.beans.*;
import java.io.*;
import java.util.*;
import javax.swing.*;

/**
   This program demonstrates the use of an XML encoder and decoder.
   All GUI and drawing code is collected in this class. The only
   interesting pieces are the action listeners for openItem and
   saveItem. Look inside the DamageReport class for encoder customizations.
*/
public class DamageReporter extends JFrame
{
   public static void main(String[] args)
   {
      JFrame frame = new DamageReporter();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);
   }

   public DamageReporter()
   {
      setTitle("DamageReporter");
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      chooser = new JFileChooser();
      chooser.setCurrentDirectory(new File("."));

      report = new DamageReport();
      report.setCarType(DamageReport.CarType.SEDAN);

      // set up the menu bar
      JMenuBar menuBar = new JMenuBar();
      setJMenuBar(menuBar);

      JMenu menu = new JMenu("File");
      menuBar.add(menu);

      JMenuItem openItem = new JMenuItem("Open");
      menu.add(openItem);
      openItem.addActionListener(new 
         ActionListener()
         {
            public void actionPerformed(ActionEvent evt)
            {
               // show file chooser dialog
               int r = chooser.showOpenDialog(null);

               // if file selected, open
               if(r == JFileChooser.APPROVE_OPTION)
               {
                  try
                  {
                     File file = chooser.getSelectedFile();
                     XMLDecoder decoder = new XMLDecoder(new FileInputStream(file));
                     report = (DamageReport) decoder.readObject();
                     decoder.close();
                     repaint();
                  }
                  catch (IOException e)
                  {
                     JOptionPane.showMessageDialog(null, e);
                  }
               }
            }
         });

      JMenuItem saveItem = new JMenuItem("Save");
      menu.add(saveItem);
      saveItem.addActionListener(new 
         ActionListener()
         {
            public void actionPerformed(ActionEvent evt)
            {
               report.setRentalRecord(rentalRecord.getText());
               chooser.setSelectedFile(new File(rentalRecord.getText() + ".xml"));
               
               // show file chooser dialog
               int r = chooser.showSaveDialog(null);

               // if file selected, save
               if(r == JFileChooser.APPROVE_OPTION)
               {                  
                  try
                  {
                     File file = chooser.getSelectedFile();
                     XMLEncoder encoder = new XMLEncoder(new FileOutputStream(file));
                     report.configureEncoder(encoder);
                     encoder.writeObject(report);
                     encoder.close();
                  }
                  catch (IOException e)
                  {
                     JOptionPane.showMessageDialog(null, e);
                  }
               }
            }
         });

      JMenuItem exitItem = new JMenuItem("Exit");
      menu.add(exitItem);
      exitItem.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               System.exit(0);
            }
         });

      // combo box for car type
      rentalRecord = new JTextField();
      carType = new JComboBox();
      carType.addItem(DamageReport.CarType.SEDAN);
      carType.addItem(DamageReport.CarType.WAGON);
      carType.addItem(DamageReport.CarType.SUV);

      carType.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               DamageReport.CarType item = (DamageReport.CarType) carType.getSelectedItem();
               report.setCarType(item);
               repaint();
            }
         });

      // panel for showing car
      carPanel = new 
         JPanel() 
         {
            public void paintComponent(Graphics g)
            {
               super.paintComponent(g);
               Graphics2D g2 = (Graphics2D) g;
               g2.draw((Shape) shapes.get(report.getCarType()));
               report.drawDamage(g2);
            }
         };
      carPanel.addMouseListener(new
         MouseAdapter()
         {
            public void mousePressed(MouseEvent event)
            {
               report.click(new Point2D.Double(event.getX(), event.getY()));
               repaint();
            }
         });
      carPanel.setBackground(new Color(0.9f, 0.9f, 0.45f));

      // radio buttons for click action
      addButton = new JRadioButton("Add");
      removeButton = new JRadioButton("Remove");
      ButtonGroup group = new ButtonGroup();
      JPanel buttonPanel = new JPanel();
      group.add(addButton);
      buttonPanel.add(addButton);
      group.add(removeButton);
      buttonPanel.add(removeButton);      
      addButton.setSelected(!report.getRemoveMode());
      removeButton.setSelected(report.getRemoveMode());
      addButton.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               report.setRemoveMode(false);
            }
         });
      removeButton.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               report.setRemoveMode(true);
            }
         });

      // layout components
      JPanel gridPanel = new JPanel();
      gridPanel.setLayout(new GridLayout(0, 2));
      gridPanel.add(new JLabel("Rental Record"));
      gridPanel.add(rentalRecord);
      gridPanel.add(new JLabel("Type of Car"));
      gridPanel.add(carType);      
      gridPanel.add(new JLabel("Operation"));
      gridPanel.add(buttonPanel);      
      
      add(gridPanel, BorderLayout.NORTH);
      add(carPanel, BorderLayout.CENTER);
   }

   private JTextField rentalRecord;
   private JComboBox carType;
   private JPanel carPanel;
   private JRadioButton addButton;
   private JRadioButton removeButton;
   private DamageReport report;
   private JFileChooser chooser;

   private static final int DEFAULT_WIDTH = 400;
   private static final int DEFAULT_HEIGHT = 400;

   private static Map<DamageReport.CarType, Shape> shapes 
      = new EnumMap<DamageReport.CarType, Shape>(DamageReport.CarType.class);

   static 
   {
      int width = 200;
      int height = 100;
      int x = 50;
      int y = 50;
      Rectangle2D.Double body = new Rectangle2D.Double(x, y + width / 6, width - 1, width / 6);
      Ellipse2D.Double frontTire = new Ellipse2D.Double(x + width / 6, y + width / 3, 
         width / 6, width / 6);
      Ellipse2D.Double rearTire = new Ellipse2D.Double(x + width * 2 / 3, y + width / 3,
         width / 6, width / 6);

      Point2D.Double p1 = new Point2D.Double(x + width / 6, y + width / 6);
      Point2D.Double p2 = new Point2D.Double(x + width / 3, y);
      Point2D.Double p3 = new Point2D.Double(x + width * 2 / 3, y);
      Point2D.Double p4 = new Point2D.Double(x + width * 5 / 6, y + width / 6);

      Line2D.Double frontWindshield = new Line2D.Double(p1, p2);
      Line2D.Double roofTop = new Line2D.Double(p2, p3);
      Line2D.Double rearWindshield = new Line2D.Double(p3, p4);

      GeneralPath sedanPath = new GeneralPath();
      sedanPath.append(frontTire, false);
      sedanPath.append(rearTire, false);
      sedanPath.append(body, false);
      sedanPath.append(frontWindshield, false);
      sedanPath.append(roofTop, false);
      sedanPath.append(rearWindshield, false);      
      shapes.put(DamageReport.CarType.SEDAN, sedanPath);

      Point2D.Double p5 = new Point2D.Double(x + width * 11 / 12, y);
      Point2D.Double p6 = new Point2D.Double(x + width, y + width / 6);
      roofTop = new Line2D.Double(p2, p5);
      rearWindshield = new Line2D.Double(p5, p6);

      GeneralPath wagonPath = new GeneralPath();
      wagonPath.append(frontTire, false);
      wagonPath.append(rearTire, false);
      wagonPath.append(body, false);
      wagonPath.append(frontWindshield, false);
      wagonPath.append(roofTop, false);
      wagonPath.append(rearWindshield, false);      
      shapes.put(DamageReport.CarType.WAGON, wagonPath);

      Point2D.Double p7 = new Point2D.Double(x + width / 3, y - width / 6);
      Point2D.Double p8 = new Point2D.Double(x + width * 11 / 12, y - width / 6);
      frontWindshield = new Line2D.Double(p1, p7);
      roofTop = new Line2D.Double(p7, p8);
      rearWindshield = new Line2D.Double(p8, p6);

      GeneralPath suvPath = new GeneralPath();
      suvPath.append(frontTire, false);
      suvPath.append(rearTire, false);
      suvPath.append(body, false);
      suvPath.append(frontWindshield, false);
      suvPath.append(roofTop, false);
      suvPath.append(rearWindshield, false);      
      shapes.put(DamageReport.CarType.SUV, suvPath);
   }
}