XuGongTeJi_flutter/lib/page/stockOut/stock_out_empty.dart

import 'package:flutter/material.dart';
import '/common/colorCom.dart';
import 'package:wms_app/utils/dialogUtils.dart';
import 'package:wms_app/api_client/stock_out.dart';
import 'dart:convert';
import 'package:logger/logger.dart';

var logger = Logger(
  printer: PrettyPrinter(),
);

class StockOutEmpty extends StatefulWidget {
  const StockOutEmpty({super.key});

  @override
  State<StockOutEmpty> createState() => _CallEmptyCartPageState();
}

class _CallEmptyCartPageState extends State<StockOutEmpty> {
  int availableVehiclesNum = 0;
  bool isDataLoaded = false;
  String goodsId = "0";
  int selectedQuantity = 1;

  @override
  void initState() {
    super.initState();
    _fetchAvailableVehicles();
  }

  Future<void> _fetchAvailableVehicles() async {
    // 只有在数据未加载过时才重新发起请求
    if (isDataLoaded) return;

    await StockOutApi.getAvailVehicleList().then((response) {
      if (response["code"] != 200) {
        var thisContext = context;
        if (thisContext.mounted) {
          DialogUtils.showWarningMessage(thisContext, "警告", "服务器请求失败",
              btnLabel: "我知道了");
        }
        return;
      }
      logger.e("yuqili response ${response}");
      final data = List<dynamic>.from(jsonDecode(response["data"]));
      logger.e("yuqili data ${data}");

      setState(() {
        availableVehiclesNum = data.length;
        isDataLoaded = true; // 数据加载完毕，设置标志位
      });
    }).catchError((err) {
      var thisContext = context;
      if (thisContext.mounted) {
        DialogUtils.showErrorMessage(
            thisContext, "请求发生错误", "请求服务器发生错误：${err.toString()}",
            btnLabel: "我知道了");
      }
    });
  }

  void callEmptyCart(int quantity) {
    // 业务逻辑，调用出库接口等
    StockOutApi.addStockOut(goodsId, quantity, "空托盘出库").then((response) {
      if (response["code"] != 200) {
        var thisContext = context;
        if (thisContext.mounted) {
          DialogUtils.showWarningMessage(thisContext, "警告", "服务器请求失败",
              btnLabel: "我知道了");
        }
        return;
      }
      final data = Map<String, dynamic>.from(jsonDecode(response["data"]));
      if (data["code"] == 200) {
        DialogUtils.showSuccessMessage(context, "成功", "空托已呼叫",
            btnLabel: "我知道了");
        return;
      }
    }).catchError((err) {
      var thisContext = context;
      if (thisContext.mounted) {
        DialogUtils.showErrorMessage(
            thisContext, "请求发生错误", "请求服务器发生错误：${err.toString()}",
            btnLabel: "我知道了");
      }
    });
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        iconTheme: const IconThemeData(color: Colors.white),
        leading: IconButton(
            onPressed: () {
              Navigator.of(context).pop();
            },
            icon: const Icon(Icons.arrow_back)),
        centerTitle: true,
        backgroundColor: ColorCommon.colorScheme,
        title: const Text(
          "呼叫空托",
          style: TextStyle(color: Colors.white),
        ),
      ),
      body: FutureBuilder<void>(
        future: _fetchAvailableVehicles(), // 使用FutureBuilder来等待获取所有车辆信息
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return Center(child: CircularProgressIndicator()); // 显示加载中
          } else if (snapshot.hasError) {
            return Center(
              child: Text("请求失败: ${snapshot.error.toString()}"),
            );
          } else {
            return Padding(
              padding: const EdgeInsets.all(16.0),
              child: Column(
                children: [
                  Row(
                    mainAxisAlignment: MainAxisAlignment.start,
                    children: [
                      // 添加一个文本来提示用户选择空托数量
                      Text("呼叫空托数量: ", style: TextStyle(fontSize: 16)),
                      // 下拉框
                      DropdownButton<int>(
                        value: selectedQuantity,
                        items: List.generate(availableVehiclesNum, (index) {
                          return DropdownMenuItem<int>(
                            value: index + 1,
                            child: Text("${index + 1}"),
                          );
                        }),
                        onChanged: (value) {
                          setState(() {
                            selectedQuantity = value!;
                          });
                        },
                        hint: Text("选择空托盘数量"),
                      ),
                      SizedBox(width: 20), // 添加一些空间
                      // 出库按钮
                      ElevatedButton(
                        onPressed: () => callEmptyCart(selectedQuantity),
                        style: ButtonStyle(
                          backgroundColor: MaterialStateProperty.all(
                              ColorCommon.colorScheme),
                        ),
                        child: Text("出库", style: TextStyle(color: Colors.white)),
                      ),
                    ],
                  ),
                ],
              ),
            );
          }
        },
      ),
    );
  }
}