[Flutter / Dart] 非同期処理を終える前に再度処理を実行しようとしたら無視する hook 実装

use_async_guard.dart

import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter_hooks/flutter_hooks.dart';

typedef Callback = FutureOr<void> Function();

class AsyncGuard extends ChangeNotifier {
  bool _isRunning = false;

  bool get isRunning => _isRunning;

  Future<void> run(Callback callback) async {
    if (_isRunning) return;

    _isRunning = true;
    notifyListeners();

    try {
      await callback();
    } finally {
      _isRunning = false;
      notifyListeners();
    }
  }
}

AsyncGuard useAsyncGuard() {
  final guard = useMemoized(() => AsyncGuard());
  useListenable(guard);
  return guard;
}