Command Builders

CommandBuilder, reducing boilerplate

command_it includes a CommandBuilder widget which makes the code above a bit nicer:

child: CommandBuilder<String, List<WeatherEntry>>(
  command: weatherManager.updateWeatherCommand,
  whileExecuting: (context, _) => Center(
    child: SizedBox(
      width: 50.0,
      height: 50.0,
      child: CircularProgressIndicator(),
    ),
  ),
  onData: (context, data, _) => WeatherListView(data),
  onError: (context, error, param) => Column(
    children: [
      Text('An Error has occurred!'),
      Text(error.toString()),
      if (error != null) Text('For search term: $param')
    ],
  ),
),

In case your Command does not return a value you can use the onSuccess builder.

toWidget() extension method on Command Result

I you are using a package get_it_mixin, provider or flutter_hooks you probably don't want to use the CommandBuilder for you there is an extension method for the CommandResult type that you can use like this:

return result.toWidget(
  whileExecuting: (lastValue, _) => Center(
    child: SizedBox(
      width: 50.0,
      height: 50.0,
      child: CircularProgressIndicator(),
    ),
  ),
  onResult: (data, _) => WeatherListView(data),
  onError: (error, lastValue, paramData) => Column(
    children: [
      Text('An Error has occurred!'),
      Text(result.error.toString()),
      if (result.error != null)
        Text('For search term: ${result.paramData}')
    ],
  ),
);