Created
June 30, 2019 05:34
-
-
Save larryq/5ff3cb85f700279a65a71241285b80fa to your computer and use it in GitHub Desktop.
test of dart
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import 'package:flutter/material.dart'; | |
| import 'bloc.dart'; | |
| typedef UpdateShouldNotify<T> = bool Function(T bloc, _BlocProvider oldWidget); | |
| class BlocProvider<T extends Bloc> extends StatefulWidget { | |
| final T bloc; | |
| final Widget child; | |
| final UpdateShouldNotify<T> updateShouldNotifyOverride; | |
| BlocProvider({ | |
| Key key, | |
| @required this.child, | |
| @required this.bloc, | |
| this.updateShouldNotifyOverride, | |
| }) : super(key: key); | |
| static T of<T extends Bloc>(BuildContext context, | |
| [bool attachContext = true]) => | |
| _BlocProvider.of(context, attachContext); | |
| @override | |
| _BlocProviderState<T> createState() => _BlocProviderState<T>(); | |
| } | |
| class _BlocProviderState<T extends Bloc> extends State<BlocProvider<T>> { | |
| @override | |
| Widget build(BuildContext context) { | |
| return _BlocProvider( | |
| bloc: widget.bloc, | |
| child: widget.child, | |
| updateShouldNotifyOverride: widget.updateShouldNotifyOverride, | |
| ); | |
| } | |
| @override | |
| void dispose() { | |
| widget.bloc.dispose(); | |
| super.dispose(); | |
| } | |
| } | |
| class _BlocProvider<T extends Bloc> extends InheritedWidget { | |
| final T bloc; | |
| final Widget child; | |
| final UpdateShouldNotify<T> updateShouldNotifyOverride; | |
| _BlocProvider({ | |
| this.bloc, | |
| this.child, | |
| this.updateShouldNotifyOverride, | |
| }) : super(child: child); | |
| static T of<T extends Bloc>(BuildContext context, bool attachContext) { | |
| final type = _typeOf<_BlocProvider<T>>(); | |
| final blocProvider = attachContext | |
| ? (context.inheritFromWidgetOfExactType(type) as _BlocProvider) | |
| : (context.ancestorInheritedElementForWidgetOfExactType(type).widget | |
| as _BlocProvider); | |
| if (blocProvider == null) { | |
| throw FlutterError('Unable to find BLoC of type $type.\n' | |
| 'Context provided: $context'); | |
| } | |
| return blocProvider.bloc; | |
| } | |
| static Type _typeOf<T>() => T; | |
| @override | |
| bool updateShouldNotify(_BlocProvider oldWidget) => | |
| updateShouldNotifyOverride != null | |
| ? updateShouldNotifyOverride(bloc, oldWidget) | |
| : oldWidget.bloc != bloc; | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment