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Nguyễn Thái Học
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‎.gitignore‎

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# Miscellaneous
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*.class
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*.log
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*.pyc
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*.swp
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.DS_Store
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.atom/
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.buildlog/
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.history
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.svn/
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# IntelliJ related
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*.iml
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*.ipr
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*.iws
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.idea/
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# The .vscode folder contains launch configuration and tasks you configure in
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# VS Code which you may wish to be included in version control, so this line
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# is commented out by default.
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#.vscode/
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# Flutter/Dart/Pub related
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**/doc/api/
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.dart_tool/
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.flutter-plugins
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.flutter-plugins-dependencies
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.packages
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.pub-cache/
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.pub/
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build/
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# Android related
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**/android/**/gradle-wrapper.jar
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**/android/.gradle
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**/android/captures/
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**/android/gradlew
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**/android/gradlew.bat
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**/android/local.properties
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**/android/**/GeneratedPluginRegistrant.java
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# iOS/XCode related
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**/ios/**/*.mode1v3
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**/ios/**/*.mode2v3
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**/ios/**/*.moved-aside
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**/ios/**/*.pbxuser
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**/ios/**/*.perspectivev3
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**/ios/**/*sync/
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**/ios/**/.sconsign.dblite
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**/ios/**/.tags*
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**/ios/**/.vagrant/
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**/ios/**/DerivedData/
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**/ios/**/Icon?
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**/ios/**/Pods/
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**/ios/**/.symlinks/
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**/ios/**/profile
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**/ios/**/xcuserdata
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**/ios/.generated/
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**/ios/Flutter/App.framework
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**/ios/Flutter/Flutter.framework
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**/ios/Flutter/Flutter.podspec
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**/ios/Flutter/Generated.xcconfig
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**/ios/Flutter/app.flx
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**/ios/Flutter/app.zip
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**/ios/Flutter/flutter_assets/
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**/ios/Flutter/flutter_export_environment.sh
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**/ios/ServiceDefinitions.json
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**/ios/Runner/GeneratedPluginRegistrant.*
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# Exceptions to above rules.
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!**/ios/**/default.mode1v3
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!**/ios/**/default.mode2v3
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!**/ios/**/default.pbxuser
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!**/ios/**/default.perspectivev3

‎.metadata‎

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# This file tracks properties of this Flutter project.
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# Used by Flutter tool to assess capabilities and perform upgrades etc.
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#
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# This file should be version controlled and should not be manually edited.
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version:
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revision: 022b333a089afb81c471ec43d1f1f4f26305d876
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channel: dev
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project_type: package

‎CHANGELOG.md‎

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## [0.0.1] - TODO: Add release date.
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* TODO: Describe initial release.

‎LICENSE‎

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TODO: Add your license here.

‎README.md‎

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# listenable_stream
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listenable_stream
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## Getting Started
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This project is a starting point for a Dart
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[package](https://flutter.dev/developing-packages/),
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a library module containing code that can be shared easily across
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multiple Flutter or Dart projects.
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For help getting started with Flutter, view our
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[online documentation](https://flutter.dev/docs), which offers tutorials,
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samples, guidance on mobile development, and a full API reference.

‎analysis_options.yaml‎

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include: package:pedantic/analysis_options.1.9.0.yaml
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linter:
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rules:
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- prefer_final_locals
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- prefer_relative_imports
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- public_member_api_docs

‎lib/listenable_stream.dart‎

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library listenable_stream;
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export './src/listenable_to_stream.dart';
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export './src/value_listenable_to_value_stream.dart';

‎lib/src/listenable_to_stream.dart‎

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import 'dart:async';
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import 'package:flutter/foundation.dart';
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/// Convert this [Listenable] to a [Stream].
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extension ListenableToStream<T extends Listenable> on T {
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/// Convert this [Listenable] to a [Stream].
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Stream<T> toStream() {
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StreamController<T> controller;
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VoidCallback listener;
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controller = StreamController<T>(
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sync: true,
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onListen: () => addListener(listener = () => controller.add(this)),
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onCancel: () {
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try {
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removeListener(listener);
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listener = null;
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} catch (_) {}
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},
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);
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return controller.stream;
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}
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}

‎lib/src/value_listenable_to_value_stream.dart‎

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import 'dart:async';
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import 'package:flutter/foundation.dart';
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import 'package:rxdart/rxdart.dart';
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import 'listenable_to_stream.dart';
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/// Convert this [ValueListenable] to a [ValueStream].
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/// The returned [ValueStream] is a Single-Subscription [Stream].
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///
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/// If [replayValue] is true, the returned [ValueStream] will replay latest value when listening to it.
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/// Otherwise, it does not.
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extension ValueListenableToValueStream<T> on ValueListenable<T> {
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/// Convert this [ValueListenable] to a [ValueStream].
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/// The returned [ValueStream] is a Single-Subscription [Stream].
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///
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/// If [replayValue] is true, the returned [ValueStream] will replay latest value when listening to it.
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/// Otherwise, it does not.
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ValueStream<T> toValueStream({bool replayValue = false}) =>
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ValueListenableStream<T>(this, replayValue);
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}
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/// A Single-Subscription Stream will emits data when [ValueListenable.value] changed.
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class ValueListenableStream<T> extends Stream<T> implements ValueStream<T> {
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final ValueListenable<T> _valueListenable;
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final bool _replayValue;
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Stream<T> _stream;
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/// Construct a [ValueListenableStream] from [ValueListenable].
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ValueListenableStream(this._valueListenable, this._replayValue);
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@override
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bool get isBroadcast => false;
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@override
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ErrorAndStackTrace get errorAndStackTrace => null;
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@override
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bool get hasError => false;
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@override
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bool get hasValue => true;
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@override
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T get value => _valueListenable.value;
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@override
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StreamSubscription<T> listen(
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void Function(T) onData, {
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Function onError,
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void Function() onDone,
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bool cancelOnError,
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}) {
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if (_replayValue) {
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_stream ??= _valueListenable
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.toStream()
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.map((_) => _valueListenable.value)
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.shareBehavior(value);
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} else {
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_stream ??=
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_valueListenable.toStream().map((_) => _valueListenable.value);
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}
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return _stream.listen(
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onData,
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onError: onError,
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onDone: onDone,
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cancelOnError: cancelOnError,
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);
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}
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}
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extension _ShareValueExtension<T> on Stream<T> {
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Stream<T> shareBehavior(T seeded) {
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final controllers = <MultiStreamController<T>>[];
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StreamSubscription<T> subscription;
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var latestValue = seeded;
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var cancel = false;
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var done = false;
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final listenUpStream = () => listen(
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(event) {
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latestValue = event;
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controllers.forEach((c) => c.addSync(event));
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},
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onError: (e, StackTrace st) =>
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controllers.forEach((c) => c.addErrorSync(e, st)),
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onDone: () {
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done = true;
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subscription = null;
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controllers.forEach((c) {
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c.onCancel = null;
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c.closeSync();
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});
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controllers.clear();
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},
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);
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final onListen = (MultiStreamController<T> controller) {
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if (cancel) {
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return controller.closeSync();
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}
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controller.addSync(latestValue);
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if (done) {
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return controller.closeSync();
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}
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final wasEmpty = controllers.isEmpty;
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controllers.add(controller);
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if (wasEmpty) {
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subscription = listenUpStream();
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}
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controller.onCancel = () {
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controllers.remove(controller);
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if (controllers.isEmpty) {
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subscription?.cancel();
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subscription = null;
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cancel = true;
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}
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};
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};
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return Stream.multi(onListen, isBroadcast: true);
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}
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}

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