counterwindow.java

Java the UML Way 书中所有源码

/*
 * CounterWindow.java   E.L. 2001-08-25
 *
 * This window is used as input window at the client side.
 * The connection to the server has to be established already.
 * It's disconnected when the user closes the window.
 */

import javax.swing.*;
import javax.swing.border.*;
import java.awt.event.*;
import java.awt.*;
import java.rmi.server.*;
import java.rmi.*;

class CounterWindow extends JFrame implements Constants {
  private JTextField number = new JTextField(8);
  private JRadioButton yesButton = new JRadioButton("Yes Votes", true);
  private JRadioButton noButton = new JRadioButton("No Votes", false);
  private JButton saveButton = new JButton("Save");
  private YesNoCounterFront counter;
  private Client theClient;

  public CounterWindow(YesNoCounterFront initCounter, Client initClient) {
    try {
      setTitle("Window for Client " + initClient.getName());
      addWindowListener(new WindowsClosingListener());
      setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
      counter = initCounter;
      theClient = initClient;

      Container guiContainer = getContentPane();
      guiContainer.add(new JLabel(), BorderLayout.NORTH);
      guiContainer.add(new InputPanel(), BorderLayout.CENTER);
      guiContainer.add(saveButton, BorderLayout.SOUTH);

      ButtonListener buttonListener = new ButtonListener();
      saveButton.setMnemonic('S');
      saveButton.addActionListener(buttonListener);

      number.requestFocus();
    } catch (Exception e) {
      System.out.println("Error in the CounterWindow constructor: " + e);
    }
  }

  /* Describes the middle panel */
  private class InputPanel extends JPanel {
    public InputPanel() {
      setLayout(new GridLayout(2, 2));
      add(new JLabel("No. of Votes: "));
      add(number);
      ButtonGroup group = new ButtonGroup();
      group.add(yesButton);
      group.add(noButton);
      add(yesButton);
      add(noButton);
      yesButton.setMnemonic('J');
      noButton.setMnemonic('N');
      SoftBevelBorder border = new SoftBevelBorder(BevelBorder.RAISED);
      Border box = BorderFactory.createTitledBorder(border, "Enter Votes");
      setBorder(box);
    }
  }

  private class ButtonListener implements ActionListener {
    public void actionPerformed(ActionEvent event) {
      int noOfVotes = 0;
      try {
        noOfVotes = Integer.parseInt(number.getText());
      } catch (NumberFormatException e) {
        JOptionPane.showMessageDialog(null, "Invalid Number");
        number.requestFocus();
      }
      try {
        if (yesButton.isSelected()) counter.increaseNumberOfYes(noOfVotes);
        else counter.increaseNumberOfNo(noOfVotes);
      } catch (Exception e) {
        System.out.println("Error in the listener to the Save button: " + e);
      }
      number.setText("");
      number.requestFocus();
    }
  }

  private class WindowsClosingListener extends WindowAdapter {
    public void windowClosing(WindowEvent event) {
      System.out.println("Tries Resigning");
      String name = "";
      try {
        name = theClient.getName();
        counter.resignMe(name);
      } catch (Exception e) {
        System.out.println("Error in WindowsClosingListener: " + e);
      }
      System.exit(0);
    }
  }
}