relay 0.3.1 relay: ^0.3.1 copied to clipboard
Library which uses modified BLoC pattern to listen to multiple updates in single builder widget.
Relay #
Library which uses modified BLoC pattern to listen to multiple updates in single builder widget.
Import
import 'package:relay/relay.dart';
Example #
Through simple implementation you can relay update from station and subscribe via RelayBuilder.
RelayBuilder Widget can listen to more than one updates you can provide observers parameter a list of updates.
Like in below example,
- first relay builder widget observes only on counter.
- second relay builder widget observes on both counter and name.
class IncrementAction extends Action{
IncrementAction() : super(null);
}
class NameAction extends Action{
NameAction(String name) : super(name);
}
class CounterUpdate extends Update{
CounterUpdate(int counter) : super(counter);
}
class NameUpdate extends Update {
NameUpdate(String name) : super(name);
}
class MessageUpdate extends Update{
MessageUpdate(String message) : super(message);
}
class ExampleStore extends Store {
int counter = 0;
@override
Stream<Update> onAction(Action action) async*{
if(action is IncrementAction) {
if (counter < 10) {
counter++;
yield CounterUpdate(counter);
} else {
final snackBarMessage = 'Maximum Limit Reached';
yield MessageUpdate(snackBarMessage);
}
}
else if(action is NameAction){
yield NameUpdate(action.params);
}
}
}
class Example extends StatefulWidget {
@override
ExampleState createState() => ExampleState();
}
class ExampleState extends State<Example>
with ProviderMixin<ExampleStore> {
void onUpdate(Update update) {
if (update is MessageUpdate)
Scaffold.of(context).showSnackBar(
SnackBar(content: Text(update.data)));
}
@override
Widget build(BuildContext context) {
final store = getStore(context);
return Scaffold(
body: Container(
child: Center(
child: Column(
children: <Widget>[
RelayBuilder<ExampleStore>(
store: getStore(context),
observers: [CounterUpdate],
builder: (context, data) => Text('${data[CounterUpdate]}'),
),
RelayBuilder<ExampleStore>(
store: getStore(context),
observers: [NameUpdate,CounterUpdate],
builder: (context, data) =>
Text('${data[NameUpdate]} : ${data[CounterUpdate]}'),
),
TextField(
onChanged: (name) => store.dispatchAction(NameAction(name)),
decoration: InputDecoration(
labelText: 'Name',
),
)
],
),
),
),
floatingActionButton: FloatingActionButton(
onPressed: () => store.dispatchAction(IncrementAction()),
child: Icon(Icons.add),
),
);
}
}
- Widget
Extend ProviderWidget and ProviderState then you can access the station object in deep hierarchies also.