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[shared_preferences_linux] Add support for Linux
Fixes flutter/flutter#41720
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## 0.5.8 | ||
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* Adds support for Linux. | ||
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## 0.5.7+3 | ||
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* Post-v2 Android embedding cleanup. | ||
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packages/shared_preferences/shared_preferences_linux/.gitignore
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.DS_Store | ||
.dart_tool/ | ||
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.packages | ||
.pub/ | ||
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build/ |
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packages/shared_preferences/shared_preferences_linux/.metadata
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# This file tracks properties of this Flutter project. | ||
# Used by Flutter tool to assess capabilities and perform upgrades etc. | ||
# | ||
# This file should be version controlled and should not be manually edited. | ||
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version: | ||
revision: e491544588e8d34fdf31d5f840b4649850ef167a | ||
channel: master | ||
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project_type: plugin |
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packages/shared_preferences/shared_preferences_linux/CHANGELOG.md
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## 0.0.1 | ||
* Initial release to support shared_preferences on Linux. |
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packages/shared_preferences/shared_preferences_linux/LICENSE
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// Copyright 2020 The Chromium Authors. All rights reserved. | ||
// | ||
// Redistribution and use in source and binary forms, with or without | ||
// modification, are permitted provided that the following conditions are | ||
// met: | ||
// | ||
// * Redistributions of source code must retain the above copyright | ||
// notice, this list of conditions and the following disclaimer. | ||
// * Redistributions in binary form must reproduce the above | ||
// copyright notice, this list of conditions and the following disclaimer | ||
// in the documentation and/or other materials provided with the | ||
// distribution. | ||
// * Neither the name of Google Inc. nor the names of its | ||
// contributors may be used to endorse or promote products derived from | ||
// this software without specific prior written permission. | ||
// | ||
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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packages/shared_preferences/shared_preferences_linux/README.md
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# shared_preferences_linux | ||
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The Linux implementation of [`shared_preferences`][1]. | ||
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## Usage | ||
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### Import the package | ||
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This package has been endorsed, meaning that you only need to add `shared_preferences` | ||
as a dependency in your `pubspec.yaml`. It will be automatically included in your app | ||
when you depend on `package:shared_preferences`. | ||
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This is what the above means to your `pubspec.yaml`: | ||
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```yaml | ||
... | ||
dependencies: | ||
... | ||
shared_preferences: ^0.5.8 | ||
... | ||
``` | ||
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[1]: ../ |
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packages/shared_preferences/shared_preferences_linux/example/.gitignore
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# Miscellaneous | ||
*.class | ||
*.log | ||
*.pyc | ||
*.swp | ||
.DS_Store | ||
.atom/ | ||
.buildlog/ | ||
.history | ||
.svn/ | ||
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# IntelliJ related | ||
*.iml | ||
*.ipr | ||
*.iws | ||
.idea/ | ||
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# The .vscode folder contains launch configuration and tasks you configure in | ||
# VS Code which you may wish to be included in version control, so this line | ||
# is commented out by default. | ||
#.vscode/ | ||
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# Flutter/Dart/Pub related | ||
**/doc/api/ | ||
.dart_tool/ | ||
.flutter-plugins | ||
.flutter-plugins-dependencies | ||
.packages | ||
.pub-cache/ | ||
.pub/ | ||
/build/ | ||
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# Web related | ||
lib/generated_plugin_registrant.dart | ||
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# Symbolication related | ||
app.*.symbols | ||
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# Obfuscation related | ||
app.*.map.json | ||
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# Exceptions to above rules. | ||
!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages |
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packages/shared_preferences/shared_preferences_linux/example/.metadata
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# This file tracks properties of this Flutter project. | ||
# Used by Flutter tool to assess capabilities and perform upgrades etc. | ||
# | ||
# This file should be version controlled and should not be manually edited. | ||
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version: | ||
revision: e491544588e8d34fdf31d5f840b4649850ef167a | ||
channel: master | ||
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project_type: app |
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packages/shared_preferences/shared_preferences_linux/example/README.md
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# shared_preferences_example | ||
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Demonstrates how to use the shared_preferences plugin. | ||
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## Getting Started | ||
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For help getting started with Flutter, view our online | ||
[documentation](http://flutter.io/). |
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packages/shared_preferences/shared_preferences_linux/example/lib/main.dart
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// Copyright 2017 The Chromium Authors. All rights reserved. | ||
// Use of this source code is governed by a BSD-style license that can be | ||
// found in the LICENSE file. | ||
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// ignore_for_file: public_member_api_docs | ||
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import 'dart:async'; | ||
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import 'package:flutter/material.dart'; | ||
import 'package:shared_preferences/shared_preferences.dart'; | ||
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void main() { | ||
runApp(MyApp()); | ||
} | ||
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class MyApp extends StatelessWidget { | ||
@override | ||
Widget build(BuildContext context) { | ||
return MaterialApp( | ||
title: 'SharedPreferences Demo', | ||
home: SharedPreferencesDemo(), | ||
); | ||
} | ||
} | ||
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class SharedPreferencesDemo extends StatefulWidget { | ||
SharedPreferencesDemo({Key key}) : super(key: key); | ||
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@override | ||
SharedPreferencesDemoState createState() => SharedPreferencesDemoState(); | ||
} | ||
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class SharedPreferencesDemoState extends State<SharedPreferencesDemo> { | ||
Future<SharedPreferences> _prefs = SharedPreferences.getInstance(); | ||
Future<int> _counter; | ||
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Future<void> _incrementCounter() async { | ||
final SharedPreferences prefs = await _prefs; | ||
final int counter = (prefs.getInt('counter') ?? 0) + 1; | ||
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setState(() { | ||
_counter = prefs.setInt("counter", counter).then((bool success) { | ||
return counter; | ||
}); | ||
}); | ||
} | ||
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@override | ||
void initState() { | ||
super.initState(); | ||
_counter = _prefs.then((SharedPreferences prefs) { | ||
return (prefs.getInt('counter') ?? 0); | ||
}); | ||
} | ||
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@override | ||
Widget build(BuildContext context) { | ||
return Scaffold( | ||
appBar: AppBar( | ||
title: const Text("SharedPreferences Demo"), | ||
), | ||
body: Center( | ||
child: FutureBuilder<int>( | ||
future: _counter, | ||
builder: (BuildContext context, AsyncSnapshot<int> snapshot) { | ||
switch (snapshot.connectionState) { | ||
case ConnectionState.waiting: | ||
return const CircularProgressIndicator(); | ||
default: | ||
if (snapshot.hasError) { | ||
return Text('Error: ${snapshot.error}'); | ||
} else { | ||
return Text( | ||
'Button tapped ${snapshot.data} time${snapshot.data == 1 ? '' : 's'}.\n\n' | ||
'This should persist across restarts.', | ||
); | ||
} | ||
} | ||
})), | ||
floatingActionButton: FloatingActionButton( | ||
onPressed: _incrementCounter, | ||
tooltip: 'Increment', | ||
child: const Icon(Icons.add), | ||
), | ||
); | ||
} | ||
} |
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packages/shared_preferences/shared_preferences_linux/example/pubspec.yaml
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name: shared_preferences_example | ||
description: Demonstrates how to use the shared_preferences plugin. | ||
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dependencies: | ||
flutter: | ||
sdk: flutter | ||
shared_preferences: | ||
path: ../../shared_preferences/ | ||
shared_preferences_linux: | ||
path: ../ | ||
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flutter: | ||
uses-material-design: true | ||
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packages/shared_preferences/shared_preferences_linux/lib/shared_preferences_linux.dart
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// Copyright 2020 The Chromium Authors. All rights reserved. | ||
// Use of this source code is governed by a BSD-style license that can be | ||
// found in the LICENSE file. | ||
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import 'dart:async'; | ||
import 'dart:convert' show json; | ||
import 'package:file/file.dart'; | ||
import 'package:file/local.dart'; | ||
import 'package:meta/meta.dart'; | ||
import 'package:path/path.dart' as path; | ||
import 'package:path_provider/path_provider.dart'; | ||
import 'package:shared_preferences_platform_interface/shared_preferences_platform_interface.dart'; | ||
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/// The Linux implementation of [SharedPreferencesStorePlatform]. | ||
/// | ||
/// This class implements the `package:shared_preferences` functionality for Linux. | ||
class SharedPreferencesLinux extends SharedPreferencesStorePlatform { | ||
/// Local copy of preferences | ||
Map<String, Object> _cachedPreferences; | ||
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/// File system used to store to disk. Exposed for testing only. | ||
@visibleForTesting | ||
FileSystem fs = LocalFileSystem(); | ||
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/// Gets the file were the preferences are stored. | ||
Future<File> _getLocalDataFile() async { | ||
var directory = await getApplicationSupportDirectory(); | ||
var filePath = path.join(directory.path, 'shared_preferences.json'); | ||
return fs.file(filePath); | ||
} | ||
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/// Gets the preferences from the stored file. Once read, the preferences are | ||
/// maintained in memory. | ||
Future<Map<String, Object>> _readPreferences() async { | ||
if (_cachedPreferences != null) { | ||
return _cachedPreferences; | ||
} | ||
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_cachedPreferences = {}; | ||
var localDataFile = await _getLocalDataFile(); | ||
if (localDataFile.existsSync()) { | ||
String stringMap = localDataFile.readAsStringSync(); | ||
if (stringMap.isNotEmpty) { | ||
_cachedPreferences = json.decode(stringMap) as Map<String, Object>; | ||
} | ||
} | ||
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return _cachedPreferences; | ||
} | ||
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/// Writes the cached preferences to disk. Returns [true] if the operation | ||
/// succeeded. | ||
Future<bool> _writePreferences(Map<String, Object> preferences) async { | ||
try { | ||
var localDataFile = await _getLocalDataFile(); | ||
if (!localDataFile.existsSync()) { | ||
localDataFile.createSync(recursive: true); | ||
} | ||
var stringMap = json.encode(preferences); | ||
localDataFile.writeAsStringSync(stringMap); | ||
} catch (e) { | ||
print("Error saving preferences to disk: $e"); | ||
return false; | ||
} | ||
return true; | ||
} | ||
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@override | ||
Future<bool> clear() async { | ||
var preferences = await _readPreferences(); | ||
preferences.clear(); | ||
return _writePreferences(preferences); | ||
} | ||
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@override | ||
Future<Map<String, Object>> getAll() async { | ||
return _readPreferences(); | ||
} | ||
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@override | ||
Future<bool> remove(String key) async { | ||
var preferences = await _readPreferences(); | ||
preferences.remove(key); | ||
return _writePreferences(preferences); | ||
} | ||
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@override | ||
Future<bool> setValue(String valueType, String key, Object value) async { | ||
var preferences = await _readPreferences(); | ||
preferences[key] = value; | ||
return _writePreferences(preferences); | ||
} | ||
} |
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