sclass ScreenShooter implements AutoCloseable {
  transient L onNewImage = syncList(); // L<Runnable|voidfunc(BufferedImage)>
  
  transient BufferedImage latestImage;
  double interval = 1.0;
  transient java.util.Timer timer;
  bool verbose = true;
  bool enabled = true;
  
  ScreenShooter start(O... _) {
    /*IF0<AutoCloseable>*/ O enter = optPar enter(_);
    timer = doEvery(interval, r {
      ret unless enabled;
      temp asAutoCloseable(callF(enter));
      long time = sysNow();
      latestImage = shootScreen2();
      if (verbose) done2_always(time, "Screenshot");
      pcallFAll(onNewImage, latestImage);
      vmBus_send newScreenShot(latestImage);
    });
    this;
  }
  
  public void close() {
    dispose timer;
  }
}