notifier

Update any widget, from anywhere at anytime.

Getting Started

Inspired from Broadcast Receiver in Android.

Works for both iOS and Android.

Add the following dependency to your project's pubspec.yaml.

notifier: <latest_version>

There are two methods that make the core of Notifier.

• notify(action, data) - Sending data for a certain action.
• register(action, callback) - Listening to data changes for a certain action.

Steps

• Add NotifierProvider at root of project's Widget tree.

void main() {
  runApp(
    NotifierProvider(
      child: MyApp(),
    ),
  );
}

• Register a callback for a certain action in your Widget tree.

@override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        Text('Data from Notifier:'),
        Notifier.of(context).register<String>('action', (data) {
          return Text('${data.data}');
        }),
      ],
    );
  }

• From anywhere in your application, call the notify method.

@override
  Widget build(BuildContext context) {
    Notifier _notifier = NotifierProvider.of(context);

    return Scaffold(
      body: Center(
        RaisedButton(
          child: Text('Notify'),
          onPressed: () {
            _notifier.notify('action', 'Sending data from notfier!');
          },
        ),
      ),
    );
  }

Things to be aware of!

• If a callback is registered on an action with a specific data type T, then passing data with data type other than T in notify method will throw error.