Menu
I want to have data from firebase in realtime on a widget. When I try to use a StreamProvider and then use Navigator.push(), the pushed widget can't get the value with Provider.of(context).
I tried putting the StreamProvider as the parent of MaterialApp. This works but the user needs to be logged in order for the Stream to get the data of the user.
I also tried using a ScopedModel. This works as well, but I don't know if this is the best approach to do this.
I would like to avoid using a global StreamProvider and would like to have an efficient solution (as little reads from firebase as possible)
main.dart
void main() => runApp(MyApp());
final GlobalKey<ScaffoldState> mainScaffoldKey = GlobalKey<ScaffoldState>();
final GlobalKey<ScaffoldState> authScaffoldKey = GlobalKey<ScaffoldState>();
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return ScopedModel<ScreenModel>(
model: ScreenModel(),
child: MultiProvider(
providers: [
StreamProvider<User>.value(value: authService.userDoc,),
StreamProvider<bool>.value(value: authService.loading.asBroadcastStream())
],
child: MaterialApp(
title: "ListAssist",
theme: ThemeData(
primarySwatch: Colors.indigo,
),
home: MainApp()
),
)
);
}
}
class MainApp extends StatefulWidget {
@override
_MainAppState createState() => _MainAppState();
}
class _MainAppState extends State<MainApp> {
@override
Widget build(BuildContext context) {
User user = Provider.of<User>(context);
bool loading = Provider.of<bool>(context);
return AnimatedSwitcher(
duration: Duration(milliseconds: 600),
child: user != null ?
StreamProvider<Group>.value(
value: databaseService.streamGroupsFromUser(),
child: Scaffold(
key: mainScaffoldKey,
body: Body(),
drawer: Sidebar(),
),
) : Scaffold(
key: authScaffoldKey,
body: AnimatedSwitcher(
duration: Duration(milliseconds: 600),
child: loading ? SpinKitDoubleBounce(color: Colors.blueAccent) : AuthenticationPage(),
),
resizeToAvoidBottomInset: false,
)
);
}
}
class Body extends StatefulWidget {
createState() => _Body();
}
class _Body extends State<Body> {
@override
Widget build(BuildContext context) {
return ScopedModelDescendant<ScreenModel>(
builder: (context, child, model) => model.screen
);
}
}
In the Sidebar I can change to GroupView and the Provider still works.
sidebar.dart (important part)
onTap: () {
ScreenModel.of(context).setScreen(GroupView(), "Gruppen");
Navigator.pop(context);
},
The GroupView has GroupItem in it
group-item.dart (important part)
onTap: () => Navigator.push(
context,
MaterialPageRoute(builder: (context) {
return GroupDetail();
}),
)
When I try to use Group group = Provider.of<Group>(context); in GroupDetail or a child widget of it, it says that it cannot find any Provider for the context.
Here is the repository.
908
asked Oct 22 '19 05:10
I figured out how to do it. I used a package called custom_navigator.
In sidebar.dart I changed the child when someone changes to the group view to the following:
StreamProvider<Group>.value(
value: databaseService.streamGroupsFromUser(user.uid),
child: CustomNavigator(
home: GroupView(),
pageRoute: PageRoutes.materialPageRoute,
)
)
With the CustomNavigator I can still use Provider.of<Group>(context) to get the data, even after a Navigator.push().
101
answered Oct 21 '22 22:10
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With