Flutter bindings for ReduRx.
It provides a Provider as an InheritedWidget so you can reach the ReduRx Store wherever you have a BuildContext.
It also has a Connect Widget so you can grab a few parts of the State (sub-state/props) and it will automatically recall builder whenever only this little connected part of the State has changed preventing unnecessary rebuilds.
convert: State -> Props- A function used bymapto transform the state in a sub-state/props.where: Props oldProps, Props newProps -> bool- A function to explicitly filter when thebuildershould be called.builder: Props newProps -> Widget- A function that receives the sub-state/props and returns aWidget.
Connect<State, String>(
convert: (state) => state.title,
where: (oldTitle, newTitle) => newTitle != oldTitle,
builder: (title) => Text(title),
)By default, Connect will only call builder if the props aren't null, otherwise it renders an empty Container.
If you want to handle null values by youself, set the nullable property to true:
Connect<State, String>(
convert: (state) => state.title,
where: (oldTitle, newTitle) => newTitle != oldTitle,
builder: (title) => Text(title),
nullable: true,
)store- A ReduRxStore.child- Your application'sWidget.static dispatch<S>(BuildContext, ActionType)- Helper to calldispatchon the Provider's context Store.
Provider(
store: Store<State>(State('Initial title')),
child: App(),
)Provider.dispatch<State>(context, ChangeTitle('New title'));For a better understanding of dispatch and ActionType head to ReduRx.
import 'package:flutter/material.dart' hide State;
import 'package:flutter_redurx/flutter_redurx.dart';
class State {
State({this.title, this.count});
final String title;
final int count;
}
class Increment extends Action<State> {
@override
State reduce(State state) =>
State(title: state.title, count: state.count + 1);
}
void main() {
final store =
Store<State>(State(title: 'Flutter-ReduRx Demo Title', count: 0));
runApp(Provider(store: store, child: MyApp()));
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter-ReduRx Demo',
theme: ThemeData(
primarySwatch: Colors.pink,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Connect<State, String>(
convert: (state) => state.title,
where: (prev, next) => next != prev,
builder: (title) => Text(title ?? ''),
),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('You have pushed the button this many times:'),
Connect<State, String>(
convert: (state) => state.count.toString(),
where: (prev, next) => next != prev,
builder: (count) => Text(count ?? '',
style: Theme.of(context).textTheme.display1),
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: () => Provider.dispatch<State>(context, Increment()),
tooltip: 'Increment',
child: Icon(Icons.add),
));
}
}
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