telephone.java

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

/**
   Presents a phone GUI for the voice mail system.
*/
public class Telephone
{
   /**
      Constructs a telephone with a speaker, keypad,
      and microphone.
   */
   public Telephone()
   {

      JPanel speakerPanel = new JPanel();
      speakerPanel.setLayout(new BorderLayout());
      speakerPanel.add(new JLabel("Speaker:"),
         BorderLayout.NORTH);
      speakerField = new JTextArea(10, 25);
      speakerPanel.add(speakerField,
         BorderLayout.CENTER);

      String keyLabels = "123456789*0#";
      JPanel keyPanel = new JPanel();
      keyPanel.setLayout(new GridLayout(4, 3));
      for (int i = 0; i < keyLabels.length(); i++)
      {
         final String label = keyLabels.substring(i, i + 1);
         JButton keyButton = new JButton(label);
         keyPanel.add(keyButton);
         keyButton.addActionListener(new
            ActionListener()
            {
               public void actionPerformed(ActionEvent event)
               {
                  connect.dial(label);
               }
            });
      }

      final JTextArea microphoneField = new JTextArea(10, 25);

      JButton speechButton = new JButton("Send speech");
      speechButton.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               connect.record(microphoneField.getText());
               microphoneField.setText("");
            }
         });

      JButton hangupButton = new JButton("Hangup");
      hangupButton.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               connect.hangup();
            }
         });

      JPanel buttonPanel = new JPanel();
      buttonPanel.add(speechButton);
      buttonPanel.add(hangupButton);
      
      JPanel microphonePanel = new JPanel();
      microphonePanel.setLayout(new BorderLayout());
      microphonePanel.add(new JLabel("Microphone:"),
         BorderLayout.NORTH);
      microphonePanel.add(microphoneField,
         BorderLayout.CENTER);
      microphonePanel.add(buttonPanel,
         BorderLayout.SOUTH);      

      JFrame frame = new JFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      Container contentPane = frame.getContentPane();
      contentPane.add(speakerPanel,
         BorderLayout.NORTH);
      contentPane.add(keyPanel, 
         BorderLayout.CENTER);
      contentPane.add(microphonePanel,
         BorderLayout.SOUTH);
      
      frame.pack();
      frame.show();
   }

   /**
      Give instructions to the mail system user.
   */
   public void speak(String output)
   {
      speakerField.setText(output);
   }

   public void run(Connection c)
   {
      connect = c;
   }

   private JTextArea speakerField;
   private Connection connect;
}