/*
   Chapter 6.2:   Java Telephone
   Programmer:    Brad Shedd
   Date:          July 17, 2006
   Filename:      Telephone.java
   Purpose:       This Program creates a telephone keypad.
*/

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

public class Telephone extends Frame implements ActionListener
{
   private Button keys[];
   private Panel keypad;
   private TextField lcd;
   private Label lbl;
   private boolean foundKey;

   public Telephone()
   {

      //construct components and initialize beginning values
      lcd = new TextField (20);
         lcd.setEditable(false);
      keypad = new Panel();
      keys = new Button[12];
      lbl = new Label("Click each button above to dial your number");

      //background color
      setBackground(Color.magenta);

      //construct and assing captions to the Buttons
      for(int i=0; i<=9; i++)
         keys[i] = new Button(String.valueOf(i));

     keys[10] = new Button("*");
      keys[11] = new Button("#");

      //set Frame and keypad layout to grid layout
      setLayout(new BorderLayout());
      keypad.setLayout(new GridLayout(4,3,10,10));

      for (int i=1; i<=3; i++) // 1,2,3
         keypad.add(keys[i]);

      for (int i=4; i<=6; i++) //4, 5, 6
         keypad.add(keys[i]);

      for (int i=7; i<=9; i++) //1, 2, 3
         keypad.add(keys[i]);

      keypad.add(keys[10]); // *

      keypad.add(keys[0]); // 0key

      keypad.add(keys[11]); // #

      for (int i=0; i<keys.length; i++)
         keys[i].addActionListener(this);

      add(lcd, BorderLayout.NORTH);
      add(keypad, BorderLayout.CENTER);
      add(lbl, BorderLayout.SOUTH);

      addWindowListener(
         new WindowAdapter()
            {
            public void windowClosing(WindowEvent e)
               {
                  System.exit(0);
               }
            }
      );

   } // end of constructor method

   public void actionPerformed(ActionEvent e)
   {
   //test for button clicks
         foundKey = false;

         //search for the clicked key
         for (int i=0; i<keys.length && !foundKey; i++)
         {
            if(e.getSource() == keys[i])
            {
               foundKey=true;
               switch(i)
               {
                  // keys
                  case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: case 8: case 9: case 10: case 11:
                     lcd.setText(lcd.getText() + keys[i].getLabel());
                     break;
               } //end switch
            } //end if
         }
   }//end actionperformed
   public static void main(String args[])
      {
         // set frame properties
         Telephone f = new Telephone();
         f.setTitle("Telephone");
         f.setBounds(50,130,250,300);
         f.setVisible(true);
      }//end main
}// end class

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