package NET.worlds.scape;

import NET.worlds.console.Window;
import java.io.IOException;
import java.util.Enumeration;

public class SetZoomMode extends Action implements MomentumBehavior {
   private boolean zoomMode;
   private static Object classCookie = new Object();

   public SetZoomMode(boolean on) {
      this.zoomMode = on;
   }

   public SetZoomMode() {
   }

   @Override
   public Persister trigger(Event e, Persister seqID) {
      SuperRoot owner = this.getOwner();
      if (owner != null && owner instanceof Pilot && ((Pilot)owner).isActive()) {
         Window w = Window.getMainWindow();
         if (w == null) {
            return null;
         } else {
            w.setDeltaMode(this.zoomMode);
            return null;
         }
      } else {
         return null;
      }
   }

   @Override
   public void saveState(Saver s) throws IOException {
      s.saveVersion(0, classCookie);
      super.saveState(s);
   }

   @Override
   public void restoreState(Restorer r) throws IOException, TooNewException {
      switch (r.restoreVersion(classCookie)) {
         case 0:
            super.restoreState(r);
            return;
         default:
            throw new TooNewException();
      }
   }

   @Override
   public void transferFrom(Enumeration oldMBs) {
      while (oldMBs.hasMoreElements()) {
         SuperRoot sr = (SuperRoot)oldMBs.nextElement();
         if (sr instanceof SetZoomMode) {
            this.zoomMode = ((SetZoomMode)sr).zoomMode;
            break;
         }
      }
   }
}