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samples/code_sharing/client/lib/main.dart

146 lines
3.6 KiB

import 'dart:convert';
import 'dart:io' show Platform;
import 'package:http/http.dart' as http;
import 'package:shared/shared.dart';
import 'package:flutter/material.dart';
final port = Platform.environment['PORT'] ?? '8080';
final host = Platform.environment['SERVER_URL'] ?? '127.0.0.1';
final scheme = Platform.environment['SERVER_SCHEME'] ?? 'http';
final serverUrl = Uri.parse('$scheme://$host:$port/');
void main() {
runApp(
const MyApp(
getCount: getCount,
increment: increment,
),
);
}
class MyApp extends StatelessWidget {
const MyApp({
super.key,
required this.getCount,
required this.increment,
});
final Future<int> Function() getCount;
final Future<int> Function(int) increment;
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
colorSchemeSeed: Colors.blue,
),
home: MyHomePage(
title: 'Flutter Demo Home Page',
getCount: getCount,
increment: increment,
),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({
super.key,
required this.title,
required this.getCount,
required this.increment,
});
final String title;
final Future<int> Function() getCount;
final Future<int> Function(int) increment;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
int localClicks = 0;
bool isWriting = false;
@override
void initState() {
super.initState();
widget.getCount().then((int val) => _counter = val);
}
void _incrementCounter() {
localClicks += 1;
setState(() => isWriting = true);
widget.increment(localClicks).then(
(int val) => setState(
() {
_counter = val;
// Leave this up for at least a split second
Future.delayed(
const Duration(milliseconds: 200),
() => setState(() => isWriting = false),
);
},
),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text(
'You have pushed the button this many times:',
style: TextStyle(fontSize: 20),
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headlineMedium,
),
if (isWriting) ...[
const SizedBox(height: 10),
const Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'Communicating with server...',
style: TextStyle(fontSize: 32, color: Colors.blue),
),
SizedBox(width: 10),
CircularProgressIndicator.adaptive(),
],
),
],
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
),
);
}
}
Future<int> getCount() async {
return http
.get(serverUrl)
.then((resp) => Count.fromJson(json.decode(resp.body)).value);
}
Future<int> increment(int by) async {
return http
.post(serverUrl, body: json.encode(Increment(by: by).toJson()))
.then((resp) => Count.fromJson(json.decode(resp.body)).value);
}