fetch method

@override Future<void> fetch([ bool listen = true ])

Provides the best data acquisition method to implement during screen build.

Data loading does not occur in duplicate when a screen is built multiple times.

Basically, it listens for data. If listen is set to false, load only.

Implementation

@override
Future<void> fetch([bool listen = true]) {
  if (listen) {
    return this.listen();
  } else {
    return loadOnce();
  }
}