flutter_async 0.9.2

Handle async tasks with ease through automatic loading, error handling, and native widget integration.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter_async/flutter_async.dart';

void main() => runApp(
      MaterialApp(
        theme: ThemeData(
          useMaterial3: true,
          colorScheme: ColorScheme.fromSeed(
            seedColor: Colors.blue,
            brightness: Brightness.light,
          ),
        ),
        home: const Scaffold(
          body: MyWidget(),
        ),
      ),
    );

class MyWidget extends StatelessWidget {
  const MyWidget({super.key});

  static const duration = Duration(seconds: 1);
  static const fabPadding = EdgeInsets.all(8);

  Future<void> onError() async {
    await Future.delayed(duration);
    throw ParallelWaitError<List, List>([], [
      'Invalid user',
      'The email is already in use',
      'The password is too weak.',
    ]);
  }

  Future<void> onSuccess() async {
    await Future.delayed(duration);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Row(
        children: [
          Column(
            children: [
              AsyncBuilder(
                future: onError(), // or stream
                loadingBuilder: (context) {
                  return const CircularProgressIndicator();
                },
                errorBuilder: (context, error, stackTrace) {
                  return Text(error.toString());
                },
                builder: (context, data) {
                  return const Text('data');
                },
              ),
              AsyncButtonBuilder(
                onPressed: onError,
                child: const FlutterLogo(size: 120),
                builder: (context, state, child) {
                  return InkWell(
                    onTap: state.press,
                    child: child,
                  );
                },
              ),
              ElevatedButton(
                onPressed: onError,
                child: const Text('ElevatedButton'),
              ).asAsync(),
              ElevatedButton.icon(
                onPressed: onError,
                label: const Text('ElevatedButton.icon'),
                icon: const Icon(Icons.add),
              ).asAsync(),
              FilledButton(
                onPressed: onError,
                child: const Text('FilledButton'),
              ).asAsync(),
              FilledButton.icon(
                onPressed: onError,
                label: const Text('FilledButton.icon'),
                icon: const Icon(Icons.add),
              ).asAsync(),
              FilledButton.tonal(
                onPressed: onError,
                child: const Text('FilledButton.tonal'),
              ).asAsync(),
              FilledButton.tonalIcon(
                onPressed: onError,
                label: const Text('FilledButton.tonalIcon'),
                icon: const Icon(Icons.add),
              ).asAsync(),
              OutlinedButton(
                onPressed: onError,
                child: const Text('OutlinedButton'),
              ).asAsync(),
              OutlinedButton.icon(
                onPressed: onError,
                label: const Text('OutlinedButton.icon'),
                icon: const Icon(Icons.add),
              ).asAsync(),
              TextButton(
                onPressed: onError,
                child: const Text('TextButton'),
              ).asAsync(),
              TextButton.icon(
                onPressed: onError,
                label: const Text('TextButton.icon'),
                icon: const Icon(Icons.add),
              ).asAsync(),
            ].map((e) => Expanded(child: Center(child: e))).toList(),
          ),
          Column(
            children: [
              IconButton(
                onPressed: onError,
                icon: const Icon(Icons.add),
              ).asAsync(),
              IconButton.filled(
                onPressed: onSuccess,
                icon: const Icon(Icons.add),
              ).asAsync(successIcon: const Icon(Icons.check)),
              IconButton.filledTonal(
                onPressed: onError,
                icon: const Icon(Icons.add),
              ).asAsync(),
              IconButton.outlined(
                onPressed: onSuccess,
                icon: const Icon(Icons.add),
              ).asAsync(),
            ],
          ),
        ],
      ),

      // Use Async to scope an [AsyncConfig] to its descendants.
      floatingActionButton: Async(
        config: AsyncConfig(
          buttonConfig: AsyncButtonConfig.icon(
            successIcon: const Icon(Icons.check),
            successColor: Colors.green,
          ),
        ),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.end,
          children: [
            FloatingActionButton.small(
              onPressed: onSuccess,
              child: const Icon(Icons.add),
            ).asAsync(),
            FloatingActionButton(
              onPressed: onSuccess,
              isExtended: true,
              child: const Icon(Icons.add),
            ).asAsync(),
            FloatingActionButton.extended(
              onPressed: onSuccess,
              icon: const Icon(Icons.add),
              label: const Text('extended'),
            ).asAsync(),
            FloatingActionButton.large(
              onPressed: onSuccess,
              child: const Icon(Icons.add),
            ).asAsync(),
          ].map((e) => Padding(padding: fabPadding, child: e)).toList(),
        ),
      ),
    );
  }
}

class AsyncSearchBox<T> extends StatelessWidget {
  const AsyncSearchBox({
    super.key,
    required this.search,
    required this.suggestionBuilder,
  });
  final Future<List<T>> Function(String query) search;
  final Widget Function(BuildContext context, T value) suggestionBuilder;

  @override
  Widget build(BuildContext context) {
    return SearchAnchor.bar(
      suggestionsBuilder: (context, controller) async {
        return [
          for (final value in await search(controller.text))
            suggestionBuilder(context, value),
        ];
      },
    );
  }
}

class Patient {
  const Patient({this.name = '', this.age = 0});
  final String name;
  final int age;
}