reset method
      
void
reset()
      
     
    
Reset and disposes any loaded content.
Implementation
void reset() {
  _readFuture = null;
  if (resource != null) {
    _content = null;
  }
  _loaded = false;
  _loadError = false;
}Reset and disposes any loaded content.
void reset() {
  _readFuture = null;
  if (resource != null) {
    _content = null;
  }
  _loaded = false;
  _loadError = false;
}