flutter_mvc 0.0.1+1

A state management framework that focuses on the separation of UI and logic.

Flutter Mvc

Flutter Mvc 是为了解决UI与逻辑分离的一个状态管理框架。 完整文档请阅读此处

Getting started

分别创建Model，MvcView<TModelType,TControllerType>，MvcController<TModelType>

/// Model
class IndexPageModel {
  IndexPageModel({required this.title});
  final String title;
}
/// Controller
class IndexPageController extends MvcController<IndexPageModel> {
  @override
  MvcView view(IndexPageModel model) {
    return IndexPage();
  }
}
/// View
class IndexPage extends MvcView<IndexPageController, IndexPageModel> {
  @override
  Widget buildView(context) {
    //...
  }
}

然后使用Mvc

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Mvc<IndexPageController, IndexPageModel>(
        create: () => IndexPageController(),
        model: IndexPageModel(title: "Flutter Mvc Demo"),
      ),
    );
  }
}

状态管理

首先在Controller的init方法中初始化状态

class IndexPageController extends MvcController<IndexPageModel> {
  @override
  void init() {
    super.init();
    initState<int>(0);
  }
}

在View中使用状态

Widget buildView(context) {
  return MvcStateScope<IndexPageController>(
    (state) {
      return Text("${state.get<int>()}");
    },
  );
}

在Controller中更新状态

updateState<int>(updater: ((state) => state.value++));

在更新状态时如果MvcStateScope曾获取过该状态，则MvcStateScope将会重建。如果在MvcStateScope区域中使用的多个状态，则任意状态发生更新这个MvcStateScope都会重建。

完整样例

import 'package:flutter/material.dart';
import 'package:flutter_mvc/flutter_mvc.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Mvc<IndexPageController, IndexPageModel>(
        create: () => IndexPageController(),
        model: IndexPageModel(title: "Flutter Demo"),
      ),
    );
  }
}

/// Model
class IndexPageModel {
  IndexPageModel({required this.title});
  final String title;
}

/// View
class IndexPage extends MvcView<IndexPageController, IndexPageModel> {
  @override
  Widget buildView(ctx) {
    return Scaffold(
      appBar: AppBar(
        title: Text(ctx.model.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            MvcStateScope<IndexPageController>(
              (state) {
                return Text("${state.get<int>()}");
              },
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: ctx.controller.incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

/// Controller
class IndexPageController extends MvcController<IndexPageModel> {
  @override
  void init() {
    super.init();
    initState<int>(0); // 初始化状态
  }

  void incrementCounter() {
    updateState<int>(updater: ((state) => state?.value++)); // 更新状态
  }

  @override
  MvcView view(model) {
    return IndexPage();
  }
}