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Flutter 3.7.0 (#1556)
* Update `simplistic_editor` for Flutter 3.4 beta * Re-enable beta and master CI * Disable on master * Added sample code for using plugins and channels from background isolates. * goderbauer feedback 1 * goderbauer feedback2 * goderbauer feedback 3 * Add `background_isolate_channels` to CI * Enable beta CI * Enable all `stable` CI projects * `dart fix --apply` * `print` -> `denugPrint` * Make deps min version not pinned * Drop `_isDebug` * Remove unused import * `dart format` * Fixup `linting_tool` * Fixup `form_app` * Enable all `master` CI * Basic fixes * Patch `simplistic_editor` * Fix nl at eol * Comment out `simplistic_editor` * Incorporating @bleroux's latest changes * Clean up CI scripts * Copy `experimental/material_3_demo` to top level * Update `game_template` * Update `animations` * Update `desktop_photo_search` * Update `flutter_maps_firestore` * Update `form_app` * Update `infinite_list` * Update `isolate_example` * Update `jsonexample` * Update `navigation_and_routing` * Update `place_tracker` * Update `platform_channels` * Update `platform_design` * Update `provider_shopper` * Fixup `context_menus` * `dart format` * Update the main `material_3_demo` * Make `tool/flutter_ci_script_stable.sh` executable again Co-authored-by: Bruno Leroux <bruno.leroux@gmail.com> Co-authored-by: Aaron Clarke <aaclarke@google.com>
This commit is contained in:
Brett Morgan
GitHub
155
background_isolate_channels/lib/main.dart
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155
background_isolate_channels/lib/main.dart
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// Copyright 2022 The Flutter team. 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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import 'dart:io' show Directory;
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import 'package:flutter/material.dart';
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import 'package:intl/intl.dart';
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import 'package:path/path.dart' as path;
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import 'package:path_provider/path_provider.dart' as path_provider;
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import 'package:shared_preferences/shared_preferences.dart';
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import 'package:uuid/uuid.dart' as uuid;
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import 'simple_database.dart';
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///////////////////////////////////////////////////////////////////////////////
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// This is the UI which will present the contents of the [SimpleDatabase]. To
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// see where Background Isolate Channels are used see simple_database.dart.
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///////////////////////////////////////////////////////////////////////////////
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void main() {
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runApp(const MyApp());
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}
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class MyApp extends StatelessWidget {
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const MyApp({super.key});
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Background Isolate Channels',
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theme: ThemeData(
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primarySwatch: Colors.blue,
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),
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home: const MyHomePage(title: 'Background Isolate Channels'),
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);
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}
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}
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class MyHomePage extends StatefulWidget {
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const MyHomePage({super.key, required this.title});
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final String title;
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@override
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State<MyHomePage> createState() {
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return _MyHomePageState();
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}
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}
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class _MyHomePageState extends State<MyHomePage> {
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/// The database that is running on a background [Isolate]. This is nullable
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/// because acquiring a [SimpleDatabase] is an asynchronous operation. This
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/// value is `null` until the database is initialized.
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SimpleDatabase? _database;
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/// Local cache of the query results returned by the [SimpleDatabase] for the
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/// UI to render from. It is nullable since querying the results is
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/// asynchronous. The value is `null` before any result has been received.
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List<String>? _entries;
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/// What is searched for in the [SimpleDatabase].
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String _query = '';
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@override
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void initState() {
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// Write the value to [SharedPreferences] which will get read on the
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// [SimpleDatabase]'s isolate. For this example the value is always true
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// just for demonstration purposes.
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final Future<void> sharedPreferencesSet = SharedPreferences.getInstance()
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.then(
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(sharedPreferences) => sharedPreferences.setBool('isDebug', true));
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final Future<Directory> tempDirFuture =
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path_provider.getTemporaryDirectory();
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// Wait until the [SharedPreferences] value is set and the temporary
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// directory is received before opening the database. If
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// [sharedPreferencesSet] does not happen before opening the
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// [SimpleDatabase] there has to be a way to refresh
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// [_SimpleDatabaseServer]'s [SharedPreferences] cached values.
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Future.wait([sharedPreferencesSet, tempDirFuture]).then((values) {
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final Directory? tempDir = values[1] as Directory?;
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final String dbPath = path.join(tempDir!.path, 'database.db');
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SimpleDatabase.open(dbPath).then((database) {
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setState(() {
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_database = database;
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});
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_refresh();
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});
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});
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super.initState();
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}
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@override
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void dispose() {
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_database?.stop();
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super.dispose();
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}
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/// Performs a find on [SimpleDatabase] with [query] and updates the listed
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/// contents.
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void _refresh({String? query}) {
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if (query != null) {
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_query = query;
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}
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_database!.find(_query).toList().then((entries) {
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setState(() {
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_entries = entries;
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});
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});
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}
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/// Adds a UUID and a timestamp to the [SimpleDatabase].
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void _addDate() {
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final DateTime now = DateTime.now();
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final DateFormat formatter =
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DateFormat('EEEE MMMM d, HH:mm:ss\n${const uuid.Uuid().v4()}');
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final String formatted = formatter.format(now);
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_database!.addEntry(formatted).then((_) => _refresh());
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: Text(widget.title),
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),
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body: Column(
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children: [
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TextField(
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onChanged:
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_database == null ? null : (query) => _refresh(query: query),
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decoration: const InputDecoration(
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labelText: 'Search',
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suffixIcon: Icon(Icons.search),
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),
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),
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Expanded(
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child: ListView.builder(
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itemBuilder: (context, index) {
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return ListTile(title: Text(_entries![index]));
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},
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itemCount: _entries?.length ?? 0,
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),
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),
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],
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),
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floatingActionButton: FloatingActionButton(
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onPressed: _database == null ? null : _addDate,
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tooltip: 'Add',
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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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