FlutterDevicePlugin/example/lib/sp_o2.dart

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:vnote_device_plugin/devices/sp_o2.dart';
import 'package:vnote_device_plugin/models/exams/sp_o2.dart';

class SpO2Card extends StatefulWidget {
  final String mac;
  final String model;

  const SpO2Card({super.key, required this.mac, required this.model});

  @override
  State<StatefulWidget> createState() => _SpO2CardState();
}

class _SpO2CardState extends State<SpO2Card> {
  late final SpO2DeviceWorker worker = SpO2DeviceWorker(
    mac: widget.mac,
    model: widget.model,
  );
  SpO2ExamValue? value;
  bool _working = false;

  @override
  void initState() {
    worker.valueUpdateEvent.addListener(_onSuccess);
    worker.errorEvent.addListener(_onError);
    super.initState();
    // WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
    //   if (mounted) {
    //     Future.delayed(const Duration(seconds: 1), () async {
    //       await worker.connect();
    //       setState(() {
    //         _working = true;
    //       });
    //     });
    //   }
    // });
  }

  @override
  void dispose() {
    worker.valueUpdateEvent.removeListener(_onSuccess);
    worker.errorEvent.removeListener(_onError);
    worker.disconnect();

    super.dispose();
  }

  void _onSuccess(_, SpO2ExamValue e) {
    setState(() {
      value = e;
    });
  }

  void _onError(_, String e) {
    Get.snackbar(
      "提示",
      "测量错误: $e",
      snackPosition: SnackPosition.TOP,
    );
  }

  @override
  Widget build(BuildContext context) {
    return Card(
      elevation: 4,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
      child: Container(
        alignment: Alignment.center,
        width: 360,
        height: 160,
        child: SizedBox(
          height: 80,
          child: Row(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.end,
            children: [
              Text(
                value?.spO2.toString() ?? "__",
                style: const TextStyle(fontSize: 80),
              ),
              const SizedBox(width: 8),
              const Text(
                "%",
                style: TextStyle(fontSize: 26),
              ),
              const SizedBox(width: 24),
              SizedBox(
                width: 60,
                height: 60,
                child: _working
                    ? OutlinedButton(
                        style: ButtonStyle(
                          backgroundColor: MaterialStatePropertyAll(
                            Colors.red.withOpacity(.08),
                          ),
                          shape: MaterialStatePropertyAll(
                            RoundedRectangleBorder(
                              borderRadius: BorderRadius.circular(30),
                            ),
                          ),
                        ),
                        onPressed: () async {
                          await worker.disconnect();
                          setState(() {
                            _working = false;
                          });
                        },
                        child: const Text(
                          "停止",
                          style: TextStyle(color: Colors.red),
                        ),
                      )
                    : OutlinedButton(
                        style: ButtonStyle(
                          backgroundColor: MaterialStatePropertyAll(
                            Theme.of(context).primaryColor.withOpacity(.08),
                          ),
                          shape: MaterialStatePropertyAll(
                            RoundedRectangleBorder(
                              borderRadius: BorderRadius.circular(30),
                            ),
                          ),
                        ),
                        onPressed: () async {
                          await worker.connect();
                          setState(() {
                            _working = true;
                          });
                        },
                        child: const Text("开始"),
                      ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}