did_change_dependencies
Author: Petrus Nguyễn Thái Học
Return a Stream that emits null and done event when State.didChangeDependencies is called for the first time.
Example
import 'dart:async';
import 'package:did_change_dependencies/did_change_dependencies.dart';
import 'package:flutter/material.dart';
import 'package:rxdart_ext/rxdart_ext.dart';
class Bloc {
Stream<String> message$ = Stream.empty(); // just demo
}
class MyPage extends StatefulWidget {
const MyPage({Key? key}) : super(key: key);
@override
_MyPageState createState() => _MyPageState();
}
class _MyPageState extends State<MyPage> with DidChangeDependenciesStream {
final bloc = Bloc();
final subscriptions = <StreamSubscription<void>>[];
@override
void initState() {
super.initState();
final handle = (String msg) {
// safe to access ScaffoldMessengerState.
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text(msg)),
);
};
subscriptions <<
didChangeDependencies$
.exhaustMap((value) => bloc.message$)
.listen(handle);
subscriptions <<
didChangeDependencies$.listen((event) {
// do something when `didChangeDependencies` is called for the first time.
});
}
@override
void dispose() {
super.dispose();
subscriptions.forEach((s) => s.cancel());
}
@override
Widget build(BuildContext context) {
return Container();
}
}
extension _ListExt<T> on List<T> {
void operator <<(T t) => add(t);
}
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