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main.dart
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main.dart
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import 'package:convenience_types/errors/errors.dart';
import 'package:convenience_types/types/form_field.dart' as form;
import 'package:convenience_types/types/maybe.dart';
import 'package:convenience_types/types/request_status.dart';
import 'package:convenience_types/types/result.dart';
import 'package:dio/dio.dart';
import 'package:example/http_client_wrapper.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Convenience Types Example'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
form.FormField<String> numberField = const form.FormField(name: 'number');
RequestStatus<Number> numberRequestStatus = const Idle();
Dio client = Dio(BaseOptions(
baseUrl: 'http://numbersapi.com/',
contentType: 'application/json; charset=utf-8'));
late HttpClientWrapper clientWrapper;
@override
void initState() {
super.initState();
clientWrapper = HttpClientWrapper(client);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text(
'Enter a number to search for a trivia:',
),
TextField(
onChanged: _onFieldChanged,
),
const SizedBox(
height: 8,
),
ElevatedButton(
onPressed: _onButtonPressed,
child: const Text('Search'),
),
const SizedBox(
height: 8,
),
numberRequestStatus.when(
idle: () => const SizedBox(),
loading: () => const LinearProgressIndicator(),
succeeded: (data) => Text(
'You\'ve just searched ${data.number}, here is a trivia for it: ${data.text}!'),
failed: (error) => Text(
'Something didn\'t go well! Sorry! hint: ${error.slug}'),
),
],
),
),
),
);
}
void _onFieldChanged(String value) {
numberField = numberField.copyWith(field: Just(value));
}
void _onButtonPressed() async {
setState(() {
numberRequestStatus = const Loading();
});
Result<Number> numberRes;
try {
numberRes = (await clientWrapper.get(
url: '${numberField.field.getOrElse('')}?json'))
.mapSuccess(_mapRequestToNumber);
numberRes = (await numberRes.mapAsyncSuccess((number) async =>
await clientWrapper.get(url: '${number.number * 2}?json')))
.mapSuccess(_mapRequestToNumber);
} catch (e) {
numberRes = Failure(
AppUnknownError(
slug: e.toString(),
),
);
}
setState(() {
numberRequestStatus = RequestStatus.fromResult(numberRes);
});
}
Result<Number> _mapRequestToNumber(data) {
try {
return Success(Number.fromJson(data));
} catch (e) {
return Failure(HttpUnknownError(slug: e.toString()));
}
}
}
class Number {
final String text;
final int number;
final String type;
Number(
this.text,
this.number,
this.type,
);
factory Number.fromJson(Map<String, dynamic> json) {
try {
return Number(
json['text']!,
json['number']!,
json['type']!,
);
} catch (e) {
throw Exception(e);
}
}
}