Flutter状态管理-FlyingRedux

简介

Flying Redux 是一个基于Redux状态管理的组装式flutter应用框架。

它有四个特性:

1. 函数式编程
2. 可预测的状态
3. 插拔式的组件化
4. 支持null safety 和 flutter 3.x

如何开始

以计数器为例，仅需要5步即可使用flying redux构建应用：

1. 引入 flying_redux
2. 创建状态类和初始化状态
3. 定义 Action 和 ActionCreator
4. 创建修改状态的 Reducer
5. 创建组件或页面视图以显示

import 'package:flying_redux/flying_redux.dart';

/// [State]
class PageState extends Cloneable<PageState> {
  late int count;

  @override
  PageState clone() {
    return PageState()..count = count;
  }
}

/// [InitState]
PageState initState(Map<String, dynamic>? args) {
  //just do something here...
  return PageState()..count = 0;
}

/// [Action]
enum CounterAction { increment }

/// [ActionCreator]
class CounterActionCreator {
  static Action increment() {
    return const Action(CounterAction.increment, payload: 1);
  }
}

/// [Reducer]
buildReducer() {
  return asReducer(<Object, Reducer>{
    CounterAction.increment: _increment,
  });
}

PageState _increment(PageState state, Action action) {
  final int num = action.payload;
  return state.clone()..count = (state.count + num);
}

/// [Page]
class CountPage extends Page<PageState, Map<String, dynamic>> {
  CountPage()
      : super(
            initState: initState,
            reducer: buildReducer(),
            view: (PageState state, Dispatch dispatch, ComponentContext ctx) {
              return Scaffold(
                body: Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      const Text(
                        'You have pushed the button this many times:',
                      ),
                      Text(state.count.toString()),
                    ],
                  ),
                ),
                floatingActionButton: FloatingActionButton(
                  onPressed: () => dispatch(CounterActionCreator.increment()),
                  tooltip: 'Increment',
                  child: const Icon(Icons.add),
                ), // This trailing comma makes auto-formatting nicer for build methods.
              );
            });
}

待办示例

如果你需要一个完整的使用例子，请参考 /example 文件夹中的 todo-list 示例。

• todo list - 一个简单的待办列表示例
• 在命令行中运行:

cd ./example
flutter run

模板插件(未上架，进行中）

• Flying Redux Template For VSCode.
• Flying Redux Template For AndroidStudio.

感谢

实际上，flying-redux的源码在命名和实现上与fish-redux基本类似，但是fish-redux
太长时间不更新了，基于它做了大量重构和修改，精简了很多概念，最后重新命名了它。

本文首次发表于掘金专栏文章