flutter_google_map/lib/pages/login_page.dart

import 'package:flutter/material.dart';
import 'package:flutter_google_map/dao/user_dao.dart';
import 'package:flutter_google_map/models/user_model.dart';

/// Description: login page
/// Time       : 07/09/2023 Sunday
/// Author     : liuyuqi.gov@msn.cn
class LoginPage extends StatefulWidget {
  const LoginPage({super.key});

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  TextEditingController userNameController = TextEditingController();
  TextEditingController passwordController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Center(
      child: SizedBox(
        width: 400,
        height: 400,
        child: Column(
          children: [
            TextFormField(
              controller: userNameController,
              decoration: const InputDecoration(
                hintText: "请输入用户名",
              ),
              validator: (v) {
                if (v == null) {
                  return "用户名不能为空";
                } else {
                  return v.trim().isNotEmpty ? null : "用户名不能为空";
                }
              },
            ),
            TextFormField(
              controller: passwordController,
              decoration: const InputDecoration(
                hintText: "请输入密码",
              ),
              obscureText: true,
              validator: (v) {
                if (v == null) {
                  return "密码不能为空";
                } else {
                  return v.trim().length > 6 ? null : "密码不能少于6位";
                }
              },
            ),
            ElevatedButton(
              onPressed: () {
                Navigator.of(context).pushNamedAndRemoveUntil(
                  "/",
                  (Route<dynamic> route) => false,
                );
              },
              child: const Text("登录"),
            ),
          ],
        ),
      ),
    ));
  }

  void login() async {
    UserDao userDao = UserDao();
    // form validate user and pwd then login
    if (Form.of(context).validate()) {
      UserModel user =
          await userDao.login(userNameController.text, passwordController.text);
    } else {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(
          content: Text("用户名或密码错误"),
        ),
      );
    }
  }
}