mirror of
https://github.com/krawieck/lemmur/
synced 2024-12-16 02:19:06 +01:00
45 lines
1.3 KiB
Dart
45 lines
1.3 KiB
Dart
import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_hooks/flutter_hooks.dart';
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import 'memo_future.dart';
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class Refreshable<T> {
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const Refreshable({@required this.snapshot, @required this.refresh})
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: assert(snapshot != null),
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assert(refresh != null);
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final AsyncSnapshot<T> snapshot;
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final AsyncCallback refresh;
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}
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/// Similar to [useMemoFuture] but adds a `.refresh` method which
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/// allows to re-run the fetcher. Calling `.refresh` will not
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/// turn AsyncSnapshot into a loading state. Instead it will
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/// replace the ready state with the new data when available
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///
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/// `keys` will re-run the initial fetching thus yielding a
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/// loading state in the AsyncSnapshot
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Refreshable<T> useRefreshable<T>(AsyncValueGetter<T> fetcher,
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[List<Object> keys = const <dynamic>[]]) {
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final newData = useState<T>(null);
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final snapshot = useMemoFuture(() async {
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newData.value = null;
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return fetcher();
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}, keys);
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final outSnapshot = () {
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if (newData.value != null) {
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return AsyncSnapshot.withData(ConnectionState.done, newData.value);
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}
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return snapshot;
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}();
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return Refreshable(
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snapshot: outSnapshot,
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refresh: () async {
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newData.value = await fetcher();
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},
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);
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}
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