trackoffical_app/lib/view/sport_wear_select_view.dart

import 'dart:async';
import 'dart:collection';

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:trackoffical_app/service/sport_wear.dart';
import 'package:sensor/sensor.dart';


Future<void> showSportWearSelectDialog() async{
  Get.put(SportWearSelectController());
  SportWearService service = Get.find();
  await service.scanStart();
  final SportWear? sw = await Get.dialog(const SportWearSelectView());
  await service.scanStop();
  if(sw != null){
    final old = service.connectedSportWear.value;
    // if(old != null){
    //   await service.disconnect(old);
    // }
    await service.disconnect(SportWear());
    await service.connect(sw);
  }

}

class SportWearSelectController extends GetxController{
  final list =<SportWear>[].obs;
  final listMap = HashMap<String, SportWear>();

  StreamSubscription<List<SportWear>>? _subscription;
  @override
  void onReady() {
    super.onReady();
    SportWearService service = Get.find();
    _subscription = service.sportWearScanResult.listen((d) {
      final newList = <SportWear>[];
      for(var one in d){
        if(! listMap.containsKey(one.address)){
          listMap[one.address] = one;
          newList.add(one);
        }
      }
      list.addAll(newList);
    });
  }

  @override
  void onClose() {
    super.onClose();
    _subscription?.cancel();
  }
}

class SportWearSelectView extends GetView<SportWearSelectController>{
  const SportWearSelectView({super.key});

  @override
  Widget build(BuildContext context) {
    return Container(
        margin: const EdgeInsets.fromLTRB(20, 120, 20, 120),
        padding: const EdgeInsets.all(20),
        decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(12)),
        child: Column(
          children: [
            Text('选择心率带', style: context.textTheme.titleLarge),
            const SizedBox(height: 12),
            Obx(() => Column(
              children: controller.list.map((element) => _ElemRow(element, (){
                Get.back(result: element);
              })).toList(),
            ) )
          ],
        ),
    ) ;
  }
}


class _ElemRow extends StatelessWidget{
  final SportWear data;
  final VoidCallback onClick;

  const _ElemRow(this.data, this.onClick);

  @override
  Widget build(BuildContext context) {
    final style = context.textTheme.bodyLarge;
    return TextButton(onPressed: onClick, child: Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Text(data.name, style: style),
      ],
    )) ;
  }

}