fd9ce27748
This does a cleanup of the examples, removing all of the "section" markers and extra comments that we don't need anymore now that the samples are no longer in the source code. It also removes the --template arguments from the {@tool dartpad} and {@tool sample} directives, since those are no longer used. It converts two examples that I discovered were still embedded into linked examples in the examples folder.
I didn't delete the templates from the snippets config folder yet, because there are still embedded samples in the dart:ui package from the engine that use them. Once dart:ui no longer uses the templates, they can be removed.
I bumped the version of the snippets package to pick up a change that allows removal of the --template argument.
135 lines
4.1 KiB
Dart
135 lines
4.1 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flutter code sample for StreamBuilder
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import 'package:flutter/material.dart';
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void main() => runApp(const MyApp());
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class MyApp extends StatelessWidget {
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const MyApp({Key? key}) : super(key: key);
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static const String _title = 'Flutter Code Sample';
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@override
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Widget build(BuildContext context) {
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return const MaterialApp(
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title: _title,
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home: MyStatefulWidget(),
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);
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}
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}
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class MyStatefulWidget extends StatefulWidget {
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const MyStatefulWidget({Key? key}) : super(key: key);
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@override
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State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
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}
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class _MyStatefulWidgetState extends State<MyStatefulWidget> {
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final Stream<int> _bids = (() async* {
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await Future<void>.delayed(const Duration(seconds: 1));
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yield 1;
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await Future<void>.delayed(const Duration(seconds: 1));
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})();
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@override
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Widget build(BuildContext context) {
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return DefaultTextStyle(
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style: Theme.of(context).textTheme.headline2!,
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textAlign: TextAlign.center,
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child: Container(
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alignment: FractionalOffset.center,
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color: Colors.white,
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child: StreamBuilder<int>(
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stream: _bids,
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builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
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List<Widget> children;
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if (snapshot.hasError) {
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children = <Widget>[
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const Icon(
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Icons.error_outline,
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color: Colors.red,
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size: 60,
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),
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Padding(
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padding: const EdgeInsets.only(top: 16),
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child: Text('Error: ${snapshot.error}'),
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),
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Padding(
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padding: const EdgeInsets.only(top: 8),
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child: Text('Stack trace: ${snapshot.stackTrace}'),
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),
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];
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} else {
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switch (snapshot.connectionState) {
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case ConnectionState.none:
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children = const <Widget>[
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Icon(
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Icons.info,
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color: Colors.blue,
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size: 60,
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),
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Padding(
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padding: EdgeInsets.only(top: 16),
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child: Text('Select a lot'),
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)
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];
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break;
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case ConnectionState.waiting:
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children = const <Widget>[
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SizedBox(
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child: CircularProgressIndicator(),
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width: 60,
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height: 60,
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),
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Padding(
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padding: EdgeInsets.only(top: 16),
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child: Text('Awaiting bids...'),
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)
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];
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break;
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case ConnectionState.active:
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children = <Widget>[
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const Icon(
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Icons.check_circle_outline,
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color: Colors.green,
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size: 60,
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),
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Padding(
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padding: const EdgeInsets.only(top: 16),
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child: Text('\$${snapshot.data}'),
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)
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];
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break;
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case ConnectionState.done:
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children = <Widget>[
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const Icon(
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Icons.info,
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color: Colors.blue,
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size: 60,
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),
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Padding(
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padding: const EdgeInsets.only(top: 16),
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child: Text('\$${snapshot.data} (closed)'),
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)
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];
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break;
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}
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}
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return Column(
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mainAxisAlignment: MainAxisAlignment.center,
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crossAxisAlignment: CrossAxisAlignment.center,
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children: children,
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);
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},
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),
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),
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);
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}
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}
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