146 lines
4.3 KiB
Dart
146 lines
4.3 KiB
Dart
import 'dart:convert';
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import 'dart:io';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:flutter/widgets.dart';
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import 'package:flutter_pickers/address_picker/locations_data.dart';
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import 'package:path/path.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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import 'package:sqflite/sqflite.dart';
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import '../models/region.dart';
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class RegionProvider extends ChangeNotifier {
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RegionProvider() {
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loadRegionData();
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}
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String _provinceName = '';
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String _cityName = '';
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String _tempProvinceName = '';
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String _tempCityName = '';
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double _declination = 0.0;
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double _tempDeclination = 0.0;
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Database db;
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String get provinceName => _provinceName;
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String get cityName => _cityName;
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String get tempProvinceName => _tempProvinceName;
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String get tempCityName => _tempCityName;
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double get tempDeclination => _tempDeclination;
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double get declination => _declination;
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final Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
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loadRegionData() async {
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db = await loadDatabase();
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final prefs = await _prefs;
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if (prefs.getString('REGION') != null) {
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final region = RegionData.fromJson(jsonDecode(prefs.getString('REGION')));
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_provinceName = region.provinceName;
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_cityName = region.cityName;
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_tempProvinceName = region.provinceName;
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_tempCityName = region.cityName;
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// WidgetsFlutterBinding.ensureInitialized();
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List<String> cityCode = Address.getCityCodeByName(
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provinceName: _provinceName, cityName: _cityName);
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if (cityCode.length == 2) {
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List<Map<String, Object>> decMap = await db.rawQuery(
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"SELECT declination FROM magnetic_declination WHERE cityId == ${cityCode[1]}");
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_declination = decMap[0]['declination'];
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_tempDeclination = decMap[0]['declination'];
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} else {
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_declination = 0.0;
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_tempDeclination = 0.0;
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}
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notifyListeners();
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}
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}
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Future<Database> loadDatabase() async {
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var databasesPath = await getDatabasesPath();
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var path = join(databasesPath, "magnetic_declination.db");
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var exists = await databaseExists(path);
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if (!exists) {
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print("Creating new copy from asset");
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try {
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await Directory(dirname(path)).create(recursive: true);
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} catch (_) {}
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// Copy from asset
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ByteData data =
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await rootBundle.load(join("assets", "magnetic_declination.db"));
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List<int> bytes =
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data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
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// Write and flush the bytes written
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await File(path).writeAsBytes(bytes, flush: true);
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} else {
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print("Opening existing database");
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}
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// open the database
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Database _db = await openDatabase(path, readOnly: true);
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return _db;
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}
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// 存储临时的省市名称，不会保存本地
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void updateRegion(pname, cname) async {
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_tempProvinceName = pname;
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_tempCityName = cname;
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List<String> cityCode = Address.getCityCodeByName(
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provinceName: _tempProvinceName, cityName: _tempCityName);
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print(cityCode);
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if (cityCode.length == 2) {
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List<Map<String, Object>> decMap = await db.rawQuery(
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"SELECT declination FROM magnetic_declination WHERE cityId == ${cityCode[1]}");
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print(decMap);
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_tempDeclination = decMap[0]['declination'];
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} else {
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_tempDeclination = 0.0;
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}
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notifyListeners();
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}
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//更新磁偏角
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void updateDeclination(pname, cname) {}
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//将临时变量保存到正式变量，并保存本地
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void saveRegion() {
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_provinceName = _tempProvinceName;
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_cityName = _tempCityName;
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_declination = _tempDeclination;
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print(_tempCityName);
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final region = <String, dynamic>{
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"provinceName": _tempProvinceName,
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'cityName': _tempCityName,
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// 'declination': _tempDeclination
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};
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_prefs.then((prefs) {
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prefs.setString('REGION', jsonEncode(region));
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});
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notifyListeners();
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}
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// 覆盖临时的变量
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void resetTemp() async {
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_tempProvinceName = _provinceName;
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_tempCityName = _cityName;
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_tempDeclination = _declination;
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notifyListeners();
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}
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// 将临时的省市名设为空
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void clearTemp() {
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_tempProvinceName = '';
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_tempCityName = '';
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_tempDeclination = 0.0;
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notifyListeners();
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}
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}
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