dependency_container

Description:

dependency container

dependency container #
A simple flutter dependency container which is more or less a map and brings support
for factory methods and lazy building of services.
Main goals #

be simple
support for easy testing and mocking

Getting Started #
Documentation
Share app container deeper in the widget tree #
Flutter InheritedWidget #
https://api.flutter.dev/flutter/widgets/InheritedWidget-class.html
Flutter Provider #
https://pub.dev/packages/provider
Example apps #
https://github.com/sterlp/solvis-app/tree/master/solvis_v2_app
https://github.com/sterlp/daily-challenge
Async app_config.dart to init the AppContainer #
/// optional parameters for testing
/// enables the re-usage of this function for test and mocking
/// of the infrastructure dependencies
Future<AppContainer> buildContext([Future<SharedPreferences>? pref]) async {
pref ??= SharedPreferences.getInstance();
final f = await pref;
return AppContainer()
.add(f)
.add(YourPrefService(f))
.addFactory((container) => YourOtherService(container.get<YourPrefService>()));
}
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Async init in the main.dart #
class MyHomePage extends StatefulWidget {
/// Enable setting of the container for testing
MyHomePage({Key? key, required this.title,
Future<AppContainer>? container}) :
_container = container ?? buildContext(),
super(key: key);

final String title;
final Future<AppContainer> _container;

@override
_MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

@override
void dispose() {
// dispose all beans
widget._container.then((value) => value.close());
super.dispose();
}

@override
Widget build(BuildContext context) {
return FutureBuilder<AppContainer>(
future: widget._container,
builder: (context, snapshot) {
if (snapshot.hasData) {
// your main screen
return _buildMain(snapshot.requireData);
} else {
// your splash screen
return Scaffold(
appBar: AppBar(title: Text(widget.title)),
body: const Center(child: CircularProgressIndicator())
);
}
});
}

Widget _buildMain(AppContainer container) {
final yourOtherService = container.get<YourOtherService>();
final yourPrefService = container.get<YourPrefService>();
return Scaffold(
// your code
);
}
}
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