trackoffical_app/lib/view/maplist/map_list_controller.dart

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import '../../logger.dart';
import '../../model.dart';
import '../../service/api.dart';
import '../../service/app.dart';
import '../../utils.dart';

class MapListController extends GetxController{
  final _mapList = <MapInfo>[].obs;
  final _mapRecommendList = <MapInfo>[].obs;

  List<MapInfo> get mapList{
    final out = _mapRecommendList.toList();
    out.addAll(_mapList.toList());
    return out;
  }

  final mapInfoListScrollController = ScrollController();
  final _api = ApiService.to;

  var regionMap = <String, String>{};
  final regionCode = ''.obs;
  String? get regionName => regionMap[regionCode.value];
  var isMapGetMoreLoading = false;
  final isLocating = false.obs;

  MPosition? get myPosition => App.to.position.value;

  _setRegionMap(){
    final m = <String, String>{};
    final list = App.to.regionList;
    for (var element in list) {
      m[element.code] = element.name;
    }
    regionMap = m;
  }

  Future<void> flushMapData() async{
    final position = App.to.position.value;
    final recommend = await _api.mapRecommendList(position);
    _mapRecommendList.value = recommend;
    final l = await _api.mapList(position, 0, 10);
    _mapList.value = l;
  }
  Future<void> mapGetMore() async{
    if(isMapGetMoreLoading){
      return;
    }
    isMapGetMoreLoading=true;
    tryCatchApi(()async{
      final position = App.to.position.value;
      final l = await _api.mapList(position, _mapList.length, 8);
      _mapList.addAll(l);
    }, onFinally: (){
      isMapGetMoreLoading=false;
    });

  }

  Future<void> reLocate({Duration? timeout}) async {
    isLocating.value = true;

    try {
      while(App.to.regionList.isEmpty){
        try{
          App.to.regionList.addAll(await ApiService.to.getRegionList()) ;
          _setRegionMap();
          regionCode.value = await ApiService.to.getRegionCode();
          break;
        }catch(e){
          await Future.delayed(1.seconds);
        }
      }
      await App.to.getPosition(forceFlush: true, timeout: timeout);
      // var future = App.to.getPosition(forceFlush: true);
      // if (timeout != null){
      //   future = future.timeout(timeout);
      // }
      //
      //
      // final p = await future;

      await flushMapData();

    } catch (e) {
      warn('定位失败：', e);
    } finally {
      App.to.isFirstLocating = false;
      isLocating.value = false;
    }
  }


  @override
  void onClose() {
    super.onClose();
    mapInfoListScrollController.dispose();
  }

  @override
  void onReady() async{
    await flushMapData();
    if(App.to.isFirstLocating){
      try{
        await reLocate(timeout: 5.seconds);
      }catch(e){
        warn('无法定位：', e);
      }
    }

    mapInfoListScrollController.addListener(() {
      if (mapInfoListScrollController.position.pixels ==
          mapInfoListScrollController.position.maxScrollExtent) {
        //达到最大滚动位置
        mapGetMore();
      }
    });
  }

}