地区选择和罗盘十字

2022-06-27 17:37:25 +08:00
parent 8cb96b4c5e
commit 2a933199ed
8 changed files with 632 additions and 263 deletions
--- a/lib/states/region.dart
+++ b/lib/states/region.dart
@ -0,0 +1,71 @@
+import 'dart:convert';
+
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import '../models/region.dart';
+
+class RegionProvider extends ChangeNotifier {
+  RegionProvider() {
+    loadRegionData();
+  }
+
+  String _provinceName = '';
+  String _cityName = '';
+  String _tempProvinceName = '';
+  String _tempCityName = '';
+
+  String get provinceName => _provinceName;
+
+  String get cityName => _cityName;
+
+  String get tempProvinceName => _tempProvinceName;
+
+  String get tempCityName => _tempCityName;
+
+  final Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
+
+  loadRegionData() {
+    _prefs.then((prefs) {
+      if (prefs.getString('REGION') != null) {
+        final region =
+            RegionData.fromJson(jsonDecode(prefs.getString('REGION')));
+        _provinceName = region.provinceName;
+        _cityName = region.cityName;
+        _tempProvinceName = region.provinceName;
+        _tempCityName = region.cityName;
+        notifyListeners();
+      }
+    });
+  }
+
+  updateRegion(pname, cname) {
+    // _provinceName = pname;
+    // _cityName = cname;
+    _tempProvinceName = pname;
+    _tempCityName = cname;
+
+    notifyListeners();
+  }
+
+  //将临时变量保存到正式变量，并保存本地
+  saveRegion() {
+    _provinceName = _tempProvinceName;
+    _cityName = _tempCityName;
+    print(_tempCityName);
+    final region = <String, dynamic>{
+      "provinceName": _tempProvinceName,
+      'cityName': _tempCityName
+    };
+    _prefs.then((prefs) {
+      prefs.setString('REGION', jsonEncode(region));
+    });
+    notifyListeners();
+  }
+
+  resetTemp() async {
+    _tempProvinceName = _provinceName;
+    _tempCityName = _cityName;
+    notifyListeners();
+  }
+}