64 lines
1.8 KiB
Dart
64 lines
1.8 KiB
Dart
/*
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* Copyright (c) 2024-2026 Fabian Freund.
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*
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* This file is part of WebLibre
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* (see https://weblibre.eu).
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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import 'package:flutter/widgets.dart';
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import 'package:flutter_hooks/flutter_hooks.dart';
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/// Creates a [ValueNotifier] that is re-created when [keys] change.
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ValueNotifier<T> useKeyedState<T>(T initialData, List<Object?> keys) {
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return use(_KeyedStateHook<T>(initialData: initialData, keys: keys));
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}
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class _KeyedStateHook<T> extends Hook<ValueNotifier<T>> {
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const _KeyedStateHook({
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required this.initialData,
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required List<Object?> keys,
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}) : super(keys: keys);
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final T initialData;
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@override
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_KeyedStateHookState<T> createState() => _KeyedStateHookState<T>();
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}
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class _KeyedStateHookState<T>
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extends HookState<ValueNotifier<T>, _KeyedStateHook<T>> {
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late final _state = ValueNotifier<T>(hook.initialData)
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..addListener(_listener);
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@override
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void dispose() {
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_state.dispose();
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super.dispose();
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}
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@override
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ValueNotifier<T> build(BuildContext context) => _state;
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void _listener() {
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setState(() {});
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}
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@override
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Object? get debugValue => _state.value;
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@override
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String get debugLabel => 'useKeyedState<$T>';
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}
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