Use redux

[Aoi-hosizora]

See https://pub.dev/packages/flutter_redux.

Temp code:

1. pubspec.yaml

# ...
  flutter_redux: ^0.7.0
# ...

2. redux/state.dart

import 'package:flutter/foundation.dart';
import 'package:manhuagui_flutter/model/user.dart';
import 'package:redux/redux.dart';

class GlobalState {
  String token;
  User user;

  GlobalState({
    @required this.token,
    @required this.user,
  });
}

class RefreshAction<T> {
  final T data;

  const RefreshAction(this.data);
}

final tokenReducer = combineReducers<String>([
  TypedReducer((String token, RefreshAction<String> action) {
    token = action.data;
    return token;
  }),
]);

final userReducer = combineReducers<User>([
  TypedReducer((User user, RefreshAction<User> action) {
    user = action.data;
    return user;
  }),
]);

GlobalState globalReducer(GlobalState state, action) {
  return GlobalState(
    token: tokenReducer(state.token, action),
    user: userReducer(state.user, action),
  );
}

3. page/mine.dart

import 'package:flutter/material.dart';
import 'package:flutter_redux/flutter_redux.dart';
import 'package:manhuagui_flutter/model/user.dart';
import 'package:redux/redux.dart';
import 'package:manhuagui_flutter/service/redux/state.dart';

/// 我的
class MineSubPage extends StatefulWidget {
  const MineSubPage({Key key}) : super(key: key);

  @override
  _MineSubPageState createState() => _MineSubPageState();
}

class _MineSubPageState extends State<MineSubPage> with AutomaticKeepAliveClientMixin {
  @override
  bool get wantKeepAlive => true;

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return StoreProvider(
      store: Store<GlobalState>(
        globalReducer,
        initialState: GlobalState(
          token: '',
          user: null,
        ),
      ),
      child: StoreConnector<GlobalState, User>(
        converter: (store) => store.state.user,
        builder: (context, user) => Scaffold(
          body: Center(
            child: Text('MineSubPage'),
          ),
        ),
      ),
    );
  }
}