///////    TimerControls.java    ///////
import java.awt.*;
import java.awt.event.*;
import java.util.StringTokenizer;

/** the controls of a timer that buzzes 
    when the set time expires
       sets the timer (input TextField)
       starts and stops the timer (start/stop button)
*/

public class TimerControls extends Panel
{     public TimerControls(Timer t, Color bg)
      {   tm = t; 
          add(st = new TextField("00 : 00", 7));
          ss = new Button("Start");
          Font f = new Font("TimesRoman", Font.BOLD, 22);
          ss.setFont(f); add(ss);
          st.setBackground(bg);
          ss.setBackground(bg);
          st.addActionListener(new SetHandler());
          ss.addActionListener(new SsHandler());
      }

      protected TimerControls() { }

      protected boolean parseString(String s, int[] ms)
      {   StringTokenizer tk = new StringTokenizer(s, " :");
          int i = tk.countTokens();
          if ( i == 2 )
          {   ms[0]=Integer.parseInt(tk.nextToken());
              ms[1]=Integer.parseInt(tk.nextToken());
              return ( ms[0] >=0 && ms[1] >= 0
                       && ms[0]+ms[1] > 0);
          }
          return false;
      }

      protected int[] setting = new int[2];
      protected Button ss; 
      protected TextField st;
      protected Timer tm;

      private final class SetHandler
                    implements ActionListener
      {   public void actionPerformed(ActionEvent e)
          {  if ( parseString( st.getText(), setting) )
             {   tm.set(setting[0], setting[1]);
                 ss.setLabel("Start");
             }
          }
      }

      private final class SsHandler
                    implements ActionListener
      {   public void actionPerformed(ActionEvent e)
          {   if ( tm.beginEnd() )
                   ss.setLabel("Stop");
              else 
                   ss.setLabel("Start");
          }
      }
}