cashier_reserve_app/lib/login/login_view.dart

import 'dart:convert';
import 'dart:typed_data';

import 'package:cashier_reserve/common/print/print.dart';
import 'package:cashier_reserve/model/login_model.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

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

  @override
  State<StatefulWidget> createState() {
    return _LoginViewState();
  }
}

class _LoginViewState extends State<LoginView> {
  String loginType = "merchant";
  int segmentIndex = 0;

  TextEditingController merchantText = TextEditingController();
  TextEditingController accountText = TextEditingController();
  TextEditingController passwordText = TextEditingController();
  TextEditingController codeText = TextEditingController();

  String authCodeUuid = "";
  String authCodeImg = "";

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

    _loadAuthCode();
  }

  void _loadAuthCode() async {
    var res = await LoginModel.getLoginAuthCode();

    if (res is Map) {
      Map<String, dynamic> result = res as Map<String, dynamic>;
      setState(() {
        authCodeUuid = result["uuid"] ?? "";
        String img = result["img"] ?? "";
        if (img.startsWith("data:image/png;base64,")) {
          authCodeImg = img.substring("data:image/png;base64,".length);
        }
      });
    } else {
      yjPrint("获取验证码失败");
    }
  }

  void _goLogin() async {}

  @override
  void dispose() {
    merchantText.dispose();
    accountText.dispose();
    passwordText.dispose();
    codeText.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black.withOpacity(0.2),
      body: GestureDetector(
        onTap: () {
          FocusScope.of(context).requestFocus(FocusNode());
        },
        child: Container(
          width: MediaQuery.of(context).size.width,
          height: MediaQuery.of(context).size.height,
          color: const Color(0x55000000),
          child: Center(
            child: Container(
              padding: const EdgeInsets.fromLTRB(30, 30, 30, 30),
              decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(10),
              ),
              width: 400,
              // height: 400,
              child: SingleChildScrollView(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    _buildTitle(context),
                    const SizedBox(
                      height: 30,
                    ),
                    _buildSegment(context),
                    const SizedBox(
                      height: 5,
                    ),
                    _buildInputTextField(context, merchantText,
                        hintText: "请输入商户号",
                        icon: Icons.store_sharp,
                        isHidden: loginType == "merchant"),
                    _buildInputTextField(context, accountText,
                        hintText: "请输入账号", icon: Icons.people),
                    _buildInputTextField(context, passwordText,
                        hintText: "请输入密码", icon: Icons.lock, isPassword: true),
                    _buildInputTextField(context, codeText,
                        hintText: "请输入验证码",
                        icon: Icons.admin_panel_settings_sharp,
                        isCode: true),
                    _buildLoginBtn(context),
                  ],
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildLoginBtn(BuildContext context) {
    return InkWell(
      onTap: () {
        _goLogin();
      },
      child: Container(
        margin: const EdgeInsets.only(top: 25),
        height: 35,
        decoration: BoxDecoration(
          color: Colors.blue,
          borderRadius: BorderRadius.circular(5),
        ),
        child: const Center(
          child: Text(
            "登录",
            style: TextStyle(fontSize: 15, color: Colors.white),
          ),
        ),
      ),
    );
  }

  Widget _buildTitle(BuildContext context) {
    return const Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Text(
          "银收客订餐系统",
          style: TextStyle(
              fontSize: 25,
              color: Color(0xff333333),
              decoration: TextDecoration.none),
        )
      ],
    );
  }

  Widget _buildSegment(BuildContext context) {
    return CupertinoSegmentedControl(
      //子标签
      children: {
        0: Container(
          width: 60,
          height: 30,
          alignment: Alignment.center,
          child: const Text(
            "商户",
            style: TextStyle(
                fontSize: 14,
                // color: Color(0xff333333),
                decoration: TextDecoration.none),
          ),
        ),
        1: Container(
          width: 60,
          height: 30,
          alignment: Alignment.center,
          child: const Text(
            "员工",
            style: TextStyle(
                fontSize: 14,
                // color: Color(0xff333333),
                decoration: TextDecoration.none),
          ),
        ),
      },
      //当前选中的索引
      groupValue: segmentIndex,
      //点击回调
      onValueChanged: (int index) {
        setState(() {
          segmentIndex = index;
          loginType = index == 0 ? "merchant" : "staff";
        });
      },
      selectedColor: Colors.blue,
      borderColor: Colors.blue,
      unselectedColor: Colors.white,
    );
  }

  Widget _buildInputTextField(
    BuildContext context,
    TextEditingController controller, {
    String hintText = "",
    IconData icon = Icons.people,
    bool isPassword = false,
    bool isHidden = false,
    bool isCode = false,
  }) {
    if (isHidden) {
      return Container();
    }
    return Column(
      children: [
        const SizedBox(
          height: 10,
        ),
        Row(
          children: [
            Expanded(
              child: Container(
                decoration: BoxDecoration(
                  border: Border.all(color: const Color(0xffefefef), width: 1),
                  borderRadius: BorderRadius.circular(5),
                ),
                padding: const EdgeInsets.fromLTRB(10, 0, 10, 0),
                height: 35,
                child: TextField(
                  controller: controller,
                  obscureText: isPassword,
                  decoration: InputDecoration(
                    icon: Icon(
                      icon,
                      color: const Color(0xffa6a6a6),
                    ),
                    hintText: hintText,
                    hintStyle: const TextStyle(
                      fontSize: 14,
                      color: Color(0xff999999),
                    ),
                    contentPadding: EdgeInsets.zero,
                    border: OutlineInputBorder(
                      borderSide: BorderSide.none,
                      borderRadius: BorderRadius.circular(5),
                    ),
                  ),
                ),
              ),
            ),
            if (isCode)
              InkWell(
                onTap: () {
                  _loadAuthCode();
                },
                child: Container(
                  margin: const EdgeInsets.only(left: 15),
                  width: 100,
                  height: 35,
                  child: Image.memory(base64ToUint8List(authCodeImg)),
                ),
              )
          ],
        ),
      ],
    );
  }

  Uint8List base64ToUint8List(String base64String) {
    const decoder = Base64Decoder();
    return decoder.convert(base64String);
  }
}