///////    Timer.java    ///////
import java.awt.*;
import java.applet.*;
import java.net.URL;

/** a 60-min timer that rings
    when the set time expires
*/

public class Timer extends Applet
{
      public void init()
      {   if ( cb == null )
               cb = getCodeBase();
          if ( ding == null )
               ding = getAudioClip(cb, "audio/ding.au");
          init2();
      }

      protected void init2()
      {   tmt = null;
          if ( cntl == null )
               cntl = new TimerControls(this, Color.cyan);
          if ( face == null )
               face = new TimerFace(Color.cyan);
          face.set(m,s);
          setLayout(new BorderLayout());
          add("Center", face);
          add("South", cntl);
      }

      public void countDown()
      {   tick();   // down
          face.set(m, s);
      }

      protected void tick()
      {  if ( s <= 0 )
         {  if ( m <= 0 )
            {   ring();
                pause();
                return;
            }
            s=59;  m--;
         }
         else s--;
         return;
      }

      protected void ring()
      {   try       // 0.4-sec interval between sounds
          {  if ( ding != null )
              {  ding.play();   Thread.sleep(400);
                 ding.play();   Thread.sleep(400);
                 ding.play();
              }
              else
              {  tk.beep();   Thread.sleep(400);
                 tk.beep();   Thread.sleep(400);
                 tk.beep();
              }  
           }  catch( InterruptedException e) { }
      }

      // returns true if timer is started else false
      public boolean beginEnd()
      {   if  ( tmt == null )
          {  tmt = new Quartz(this);  
             tmt.tref(tmt); 
             tmt.start();   // start Quartz thread
             return true;
          }
          pause();
          return false;
      }

      public void pause()
      {   if ( tmt != null )
          {    tmt.tref(null); 
               tmt=null;
          }
      }

      public void start()
      {   face.set(m,s);  }

      public void set(int min, int sec)
      {   if ( min < 0 || sec < 0 ) return;
          pause();
          m = Math.min(min, 60);
          if ( m == 60 ) s = 0;
          else s = Math.min(sec, 59);  
          face.set(m,s);
      }

      protected TimerControls cntl;
      protected TimerFace face;
      protected URL cb;             // code base
      protected AudioClip ding;     // for applet sound
      protected Toolkit tk;         // for application sound
      protected int m=0, s=0;       // min, sec, counter
      protected Quartz tmt = null;  // timing thread
}