isekai_wiki_app/lib/models/settings.dart

import 'dart:convert';

import 'package:flutter/foundation.dart';
import 'package:get/get.dart';
import 'package:json_annotation/json_annotation.dart';
import 'package:shared_preferences/shared_preferences.dart';

import '../global.dart';

part 'settings.g.dart';

@JsonSerializable()
class AppSettings {
  bool? betaPageRender;

  AppSettings({this.betaPageRender});

  factory AppSettings.fromJson(Map<String, dynamic> json) => _$AppSettingsFromJson(json);

  Map<String, dynamic> toJson() => _$AppSettingsToJson(this);
}

class AppSettingsController extends GetxController {
  bool _ignoreSave = false;

  var betaPageRender = false.obs;

  @override
  void onInit() {
    super.onInit();

    loadFromStorage();

    everAll([betaPageRender], (_) {
      saveToStorage();
    });
  }

  /// 从本地存储读取
  Future<void> loadFromStorage() async {
    try {
      final prefs = await SharedPreferences.getInstance();
      var settingsJson = prefs.getString("settings");
      if (settingsJson == null) return;

      var settingsObject = jsonDecode(settingsJson);
      if (settingsObject == null) return;

      var settingsData = AppSettings.fromJson(settingsObject);

      _ignoreSave = true;
      betaPageRender.value = settingsData.betaPageRender ?? betaPageRender.value;
      _ignoreSave = false;
    } catch (ex) {
      if (kDebugMode) {
        print(ex);
      }
    } finally {
      _ignoreSave = false;
    }
  }

  /// 保存到本地存储
  void saveToStorage() {
    if (_ignoreSave) return;

    final prefs = Global.sharedPreferences!;

    var settingsData = AppSettings(betaPageRender: betaPageRender.value);

    var settingsJson = jsonEncode(settingsData.toJson());

    prefs.setString("settings", settingsJson);
  }
}