store_scope 0.0.10
store_scope: ^0.0.10 copied to clipboard
A Flutter state management solution using store scope pattern
import 'package:flutter/material.dart';
import 'package:store_scope/store_scope.dart';
class NumberObj {
final int number;
NumberObj({required this.number});
}
class CounterViewModel extends ViewModel {
final NumberObj numberObj;
final int multiplyNumber;
CounterViewModel(this.numberObj, this.multiplyNumber);
final _count = ValueNotifier<int>(0);
ValueNotifier<int> get count => _count;
void increment() {
_count.value = count.value + numberObj.number;
}
@override
void init() {
super.init();
count.value = numberObj.number * multiplyNumber;
}
@override
void dispose() {
super.dispose();
_count.dispose();
}
}
final numberProvider = Provider.withArgument((space, int number) {
return NumberObj(number: number);
});
final counterProvider = ViewModelProvider.withArgument((
space,
int multiplyNumber,
) {
final numberViewModel = space.bind(numberProvider(5));
return CounterViewModel(numberViewModel, multiplyNumber);
});
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return StoreScope(
child: MaterialApp(
title: 'StoreScope Example',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
useMaterial3: true,
),
home: const StartPage(),
),
);
}
}
class StartPage extends StatelessWidget {
const StartPage({super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('Start Page')),
body: Center(
child: ElevatedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => CounterPage()),
);
},
child: const Text('Open Counter Page'),
),
),
);
}
}
class CounterPage extends StatelessWidget with ScopedSpaceStatelessMixin {
CounterPage({super.key});
@override
Widget buildWithSpace(BuildContext context, StoreSpace space) {
CounterViewModel viewModel = space.bind(
counterProvider(2)
);
return Scaffold(
appBar: AppBar(title: const Text('Counter Example')),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
ValueListenableBuilder<int>(
valueListenable: viewModel.count,
builder: (context, count, child) {
return Text(
'Count: $count',
style: Theme.of(context).textTheme.headlineMedium,
);
},
),
const SizedBox(height: 20),
ElevatedButton(
onPressed: () {
viewModel.increment();
},
child: const Text('Increment'),
),
const SizedBox(height: 20),
ElevatedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => CounterPage()),
);
},
child: const Text('Open new page'),
),
ElevatedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => const StoreScopePage(),
),
);
},
child: const Text('Open StoreScopePage'),
),
],
),
),
);
}
}
class StoreScopePage extends AutoStoreWidget {
const StoreScopePage({super.key});
@override
Widget build(BuildContext context) {
var viewModel = context.store.shared(counterProvider(2));
viewModel.increment();
return const ChildPage();
}
}
class ChildPage extends StatefulWidget {
const ChildPage({super.key});
@override
State<ChildPage> createState() => _ChildPageState();
}
class _ChildPageState extends State<ChildPage> {
@override
void initState() {
super.initState();
context.store.shared(counterProvider(2)).increment();
}
@override
Widget build(BuildContext context) {
return CounterPage();
}
}