mirror of
https://github.com/flutter/flutter
synced 2024-10-14 04:02:56 +00:00
85 lines
2.1 KiB
Dart
85 lines
2.1 KiB
Dart
import 'dart:async';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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void main() {
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runApp(new FlutterView());
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}
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class FlutterView extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return new MaterialApp(
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title: 'Flutter View',
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theme: new ThemeData(
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primarySwatch: Colors.grey,
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),
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home: new MyHomePage(),
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);
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}
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}
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class MyHomePage extends StatefulWidget {
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@override
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_MyHomePageState createState() => new _MyHomePageState();
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}
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class _MyHomePageState extends State<MyHomePage> {
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static const String _channel = "increment";
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static const String _pong = "pong";
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static const String _emptyMessage = "";
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static const BasicMessageChannel<String> platform =
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const BasicMessageChannel<String>(_channel, const StringCodec());
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int _counter = 0;
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@override
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void initState() {
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super.initState();
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platform.setMessageHandler(_handlePlatformIncrement);
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}
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Future<String> _handlePlatformIncrement(String message) async {
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setState(() {
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_counter++;
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});
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return _emptyMessage;
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}
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void _sendFlutterIncrement() {
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platform.send(_pong);
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}
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@override
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Widget build(BuildContext context) {
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return new Scaffold(
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body: new Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: <Widget>[
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new Expanded(
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child: new Center(
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child: new Text(
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'Platform button tapped $_counter time${ _counter == 1 ? '' : 's' }.',
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style: const TextStyle(fontSize: 17.0))
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),
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),
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new Container(
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padding: const EdgeInsets.only(bottom: 15.0, left: 5.0),
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child: new Row(
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children: <Widget>[
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new Image.asset('assets/flutter-mark-square-64.png', scale: 1.5),
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const Text('Flutter', style: const TextStyle(fontSize: 30.0)),
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],
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),
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),
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],
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),
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floatingActionButton: new FloatingActionButton(
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onPressed: _sendFlutterIncrement,
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child: const Icon(Icons.add),
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),
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);
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}
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}
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