removeListener method

void removeListener (ImageListener listener)

Stop listening for new concrete ImageInfo objects and errors from its associated ImageErrorListener.

Implementation 

void removeListener(ImageListener listener) {
  for (int i = 0; i < _listeners.length; ++i) {
    if (_listeners[i].listener == listener) {
      _listeners.removeAt(i);
      continue;
    }
  }
}