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提交 55c7a838 authored 作者: 王健's avatar 王健
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README.md
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......@@ -4,7 +4,9 @@
## Getting Started
pubspec.yaml文件
修改pubspec.yaml文件引入相关包
> 不写版本号会自动引入最新的版本,建议写版本号,防止插件更新后下载的包不一致,导致项目无法运行.
```
name: flutter_counter
description: A new Flutter project.
......@@ -32,3 +34,4 @@ flutter:
flutter packages get
```
## 创建CounterBloc
\ No newline at end of file
lib/counter/counter_bloc.dart 0 → 100644
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import 'package:bloc/bloc.dart';
import 'counter_event.dart';
// CounterBloc 就是在将CounterEvent事件转化成int状态
class CounterBloc extends Bloc<CounterEvent, int> {
@override
int get initialState => 0;
@override
Stream<int> mapEventToState(CounterEvent event) async* {
switch (event) {
case CounterEvent.decrement:
yield currentState - 1;
break;
case CounterEvent.increment:
yield currentState + 1;
break;
}
}
}
\ No newline at end of file
lib/counter/counter_event.dart 0 → 100644
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/// 计数器的事件类型
/// increment 增加事件
/// decrement 减少事件
enum CounterEvent{
increment,
decrement
}
\ No newline at end of file
lib/main.dart
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import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import './view/counter_page.dart';
import './counter/counter_bloc.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
home: BlocProvider<CounterBloc>(
builder: (context) => CounterBloc(),
child: CounterPage(),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
lib/view/counter_page.dart 0 → 100644
浏览文件 @ 55c7a838
import 'package:counter/counter/counter_bloc.dart';
import 'package:counter/counter/counter_event.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
class CounterPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
final CounterBloc _counterBloc = BlocProvider.of<CounterBloc>(context);
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.black26,
elevation: 0,
title: Text('Bloc计数器'),
),
body: BlocBuilder<CounterBloc, int>(
bloc: _counterBloc,
builder: (BuildContext context, int count) {
return Center(
child: Text(
'$count',
style: TextStyle(fontSize: 24.0),
),
);
},
),
floatingActionButton: Column(
mainAxisAlignment: MainAxisAlignment.end,
crossAxisAlignment: CrossAxisAlignment.end,
children: <Widget>[
FloatingActionButton(
onPressed: () {
_counterBloc.dispatch(CounterEvent.increment);
},
backgroundColor: Colors.green,
child: Icon(Icons.add),
),
SizedBox(
height: 10.0,
),
FloatingActionButton(
onPressed: () {
_counterBloc.dispatch(CounterEvent.decrement);
},
child: Icon(Icons.remove),
backgroundColor: Colors.pink,
)
],
));
}
}
pubspec.lock
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......@@ -8,6 +8,13 @@ packages:
url: "https://pub.flutter-io.cn"
source: hosted
version: "2.2.0"
bloc:
dependency: transitive
description:
name: bloc
url: "https://pub.flutter-io.cn"
source: hosted
version: "0.14.4"
boolean_selector:
dependency: transitive
description:
......@@ -41,6 +48,13 @@ packages:
description: flutter
source: sdk
version: "0.0.0"
flutter_bloc:
dependency: "direct main"
description:
name: flutter_bloc
url: "https://pub.flutter-io.cn"
source: hosted
version: "0.20.0"
flutter_test:
dependency: "direct dev"
description: flutter
......@@ -54,7 +68,7 @@ packages:
source: hosted
version: "0.12.5"
meta:
dependency: transitive
dependency: "direct main"
description:
name: meta
url: "https://pub.flutter-io.cn"
......@@ -74,6 +88,13 @@ packages:
url: "https://pub.flutter-io.cn"
source: hosted
version: "1.8.0+1"
provider:
dependency: transitive
description:
name: provider
url: "https://pub.flutter-io.cn"
source: hosted
version: "3.0.0+1"
quiver:
dependency: transitive
description:
......@@ -81,6 +102,13 @@ packages:
url: "https://pub.flutter-io.cn"
source: hosted
version: "2.0.3"
rxdart:
dependency: transitive
description:
name: rxdart
url: "https://pub.flutter-io.cn"
source: hosted
version: "0.22.1+1"
sky_engine:
dependency: transitive
description: flutter
......
pubspec.yaml
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......@@ -23,6 +23,9 @@ dependencies:
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^0.1.2
flutter_bloc:
meta:
dev_dependencies:
flutter_test:
......
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