update bloc demo

Author: biranwangxinlei

mecury_project/example/bloc_demo/lib/main.dart

@@ -1,35 +1,27 @@
+import 'package:bloc_demo/rxdart/top_page.dart';
 /**
  * 切换注释查看single_global_instance / scoped模式的BLoC demo
  * 有两个地方需要切换，一个是导入的top_page要切换，另外一个是MyApp要切换
  */
 import 'package:flutter/material.dart';
-//单例
-//import 'package:bloc_demo/single_global_instance/top_page.dart';
-//scoped
-//import 'package:bloc_demo/scoped/top_page.dart';
-//import 'package:bloc_demo/scoped/blocs/bloc_provider.dart';
-//rxdart
-import 'package:bloc_demo/rxdart/blocs/bloc_provider.dart';
-import 'package:bloc_demo/rxdart/top_page.dart';
-
 
 void main() => runApp(MyApp());
 
 /**
  * scoped 入口
  */
-class MyApp extends StatelessWidget {
-  @override
-  Widget build(BuildContext context) {
-    return BlocProvider(
-      child: MaterialApp(
-        title: 'scoped',
-        theme: ThemeData.dark(),
-        home: TopPage(),
-      ),
-    );
-  }
-}
+//class MyApp extends StatelessWidget {
+//  @override
+//  Widget build(BuildContext context) {
+//    return BlocProvider(
+//      child: MaterialApp(
+//        title: 'scoped',
+//        theme: ThemeData.dark(),
+//        home: TopPage(),
+//      ),
+//    );
+//  }
+//}
 
 /**
  * single_global_instance 入口
@@ -48,15 +40,13 @@ class MyApp extends StatelessWidget {
 /**
  * rxdart 入口
  */
-//class MyApp extends StatelessWidget {
-//  @override
-//  Widget build(BuildContext context) {
-//    return BlocProvider(
-//      child: MaterialApp(
-//        title: 'rxdart',
-//        theme: ThemeData.dark(),
-//        home: TopPage(),
-//      ),
-//    );
-//  }
-//}
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'rxdart',
+      theme: ThemeData.dark(),
+      home: TopPage(),
+    );
+  }
+}

mecury_project/example/bloc_demo/lib/rxdart/blocs/bloc_provider.dart

@@ -1,16 +1,8 @@
-import 'package:rxdart/rxdart.dart';
 import 'dart:async';
 
-class CountBLoC {
-  int _count = 0;
-  var _subject = BehaviorSubject<int>();
-
-  Stream<int> get stream => _subject.stream;
-  int get value => _count;
-
-  void increment() => _subject.add(++_count);
-
-  void dispose() {
-    _subject.close();
-  }
+abstract class CountBloc {
+  Stream<int> get stream;
+  int get value;
+  void increment();
+  void dispose();
 }

mecury_project/example/bloc_demo/lib/rxdart/blocs/count_bloc.dart

@@ -0,0 +1,17 @@
+import 'package:rxdart/rxdart.dart';
+
+import 'count_bloc.dart';
+
+class CountBLoCImpl implements CountBloc {
+  int _count = 0;
+  var _subject = BehaviorSubject<int>();
+
+  Stream<int> get stream => _subject.stream;
+  int get value => _count;
+
+  void increment() => _subject.add(++_count);
+
+  void dispose() {
+    _subject.close();
+  }
+}

mecury_project/example/bloc_demo/lib/rxdart/blocs/count_bloc_impl.dart

@@ -1,12 +1,24 @@
+import 'package:bloc_demo/rxdart/blocs/count_bloc_impl.dart';
 import 'package:flutter/material.dart';
-import 'package:bloc_demo/rxdart/blocs/bloc_provider.dart';
+
 import 'under_page.dart';
 
-class TopPage extends StatelessWidget {
+class TopPage extends StatefulWidget {
   @override
-  Widget build(BuildContext context) {
-    final bloc = BlocProvider.of(context);
+  _TopPageState createState() => _TopPageState();
+}
 
+class _TopPageState extends State<TopPage> {
+  final bloc = CountBLoCImpl();
+
+  @override
+  void dispose() {
+    bloc?.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
         title: Text('Top Page'),
@@ -24,8 +36,10 @@ class TopPage extends StatelessWidget {
       ),
       floatingActionButton: FloatingActionButton(
           child: Icon(Icons.navigate_next),
-          onPressed: () =>
-              Navigator.of(context).push(MaterialPageRoute(builder: (context) => UnderPage()))),
+          onPressed: () => Navigator.of(context).push(MaterialPageRoute(
+              builder: (context) => UnderPage(
+                    bloc: bloc,
+                  )))),
     );
   }
 }

mecury_project/example/bloc_demo/lib/rxdart/top_page.dart

@@ -1,11 +1,14 @@
 import 'package:flutter/material.dart';
-import 'package:bloc_demo/rxdart/blocs/bloc_provider.dart';
+
+import 'blocs/count_bloc.dart';
 
 class UnderPage extends StatelessWidget {
+  final CountBloc bloc;
+
+  UnderPage({@required this.bloc});
+
   @override
   Widget build(BuildContext context) {
-    final bloc = BlocProvider.of(context);
-
     return Scaffold(
       appBar: AppBar(
         title: Text('Under Page'),