@Override
  public boolean isTransforming() {
    if (isActive()) {
      int size = size();

      for (int i = 0; i < size; i++) {
        ImageDataFilter<?> filter = m_filters.get(i);

        if ((null != filter) && (filter.isTransforming()) && (filter.isActive())) {
          return true;
        }
      }
    }
    return false;
  }