package greenfoot.sound;




| A controllable timer, keeps track of time since a mark.
|
public class TimeTracker
{       
private long startTime;
   
   private boolean tracking;
   
   private long timeElapsed;
    
   
   public void start() 
   {
      if (tracking) {            
         return;         
         }
      startTime = System.currentTimeMillis();    
       
      tracking = true;     
      }
    
   
   public void pause()
   {
      if (!tracking) {            
         return;         
         }
      long timeSincestart = getTimeSinceStart();
       
      timeElapsed += timeSincestart;
       
      tracking = false;     
      }

   
   


| Reset time to 0 and stop the timer.
|
public void reset()
   {        
      startTime = 0;
       
      tracking = false;
       
      timeElapsed = 0;     
      }
    
   
   private long getTimeSinceStart()
   {
      if (tracking) {
         return System.currentTimeMillis() - startTime;         
         }
       

      else {
           
      return 0;         
      }     
   }
    
   



| Get the time tracked, in milliseconds, since the mark.
|
public long getTimeTracked()
   {
   return timeElapsed + getTimeSinceStart();     
   }
    
   



| Reset the time tracked to the given time. The time tracked continues
| to count up if the TimeTracker is started.
|
public void setTimeTracked(long newTime) 
   {
   if (tracking) {
      startTime = System.currentTimeMillis() - newTime;
           
      timeElapsed = 0;        
      }

   else {
           
   timeElapsed = newTime;         
   }     
} 
}