332 lines
11 KiB
Dart
332 lines
11 KiB
Dart
// 登录页面 — 用户名密码登录 + 注册切换
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//
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// 设计要点：
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// - 温暖治愈风格，使用珊瑚色主色调
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// - 表单验证友好提示（面向小学生，语言简单）
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// - 密码可切换可见性
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// - 登录/注册模式平滑切换
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import 'package:flutter/material.dart';
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import 'package:flutter_bloc/flutter_bloc.dart';
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import 'package:go_router/go_router.dart';
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import '../../../core/constants/design_tokens.dart';
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import '../../../core/theme/app_radius.dart';
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import '../bloc/auth_bloc.dart';
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/// 登录/注册页面
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class LoginPage extends StatefulWidget {
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const LoginPage({super.key});
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@override
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State<LoginPage> createState() => _LoginPageState();
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}
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class _LoginPageState extends State<LoginPage> with SingleTickerProviderStateMixin {
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final _formKey = GlobalKey<FormState>();
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final _usernameController = TextEditingController();
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final _passwordController = TextEditingController();
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final _displayNameController = TextEditingController();
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bool _isRegister = false;
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bool _obscurePassword = true;
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late final AnimationController _animController;
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late final Animation<double> _fadeAnim;
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@override
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void initState() {
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super.initState();
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_animController = AnimationController(
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vsync: this,
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duration: DesignTokens.animNormal,
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);
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_fadeAnim = CurvedAnimation(
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parent: _animController,
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curve: DesignTokens.warmCurve,
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);
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_animController.forward();
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}
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@override
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void dispose() {
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_usernameController.dispose();
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_passwordController.dispose();
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_displayNameController.dispose();
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_animController.dispose();
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super.dispose();
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}
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void _submit() {
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if (!_formKey.currentState!.validate()) return;
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if (_isRegister) {
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context.read<AuthBloc>().add(RegisterRequested(
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username: _usernameController.text.trim(),
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password: _passwordController.text,
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displayName: _displayNameController.text.trim().isEmpty
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? null
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: _displayNameController.text.trim(),
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));
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} else {
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context.read<AuthBloc>().add(LoginRequested(
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username: _usernameController.text.trim(),
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password: _passwordController.text,
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));
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}
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}
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@override
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Widget build(BuildContext context) {
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final theme = Theme.of(context);
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final colorScheme = theme.colorScheme;
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return BlocListener<AuthBloc, AuthState>(
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listener: (context, state) {
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if (state is Authenticated) {
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if (state.needsRoleSelection) {
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context.go('/role-selection');
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} else if (state.needsClassCode) {
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context.go('/class-code');
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} else {
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context.go('/home');
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}
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}
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},
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child: Scaffold(
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body: SafeArea(
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child: Center(
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child: SingleChildScrollView(
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padding: const EdgeInsets.symmetric(
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horizontal: DesignTokens.spacing32,
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),
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child: FadeTransition(
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opacity: _fadeAnim,
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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_buildHeader(context, colorScheme),
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const SizedBox(height: DesignTokens.spacing48),
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_buildForm(context, theme, colorScheme),
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const SizedBox(height: DesignTokens.spacing24),
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_buildSubmitButton(context, colorScheme),
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const SizedBox(height: DesignTokens.spacing16),
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_buildModeToggle(context, colorScheme),
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const SizedBox(height: DesignTokens.spacing32),
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BlocBuilder<AuthBloc, AuthState>(
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builder: (context, state) {
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if (state is AuthError) {
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return _buildErrorMessage(state.message, colorScheme);
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}
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return const SizedBox.shrink();
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},
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),
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],
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),
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),
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),
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),
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),
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),
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);
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}
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Widget _buildHeader(BuildContext context, ColorScheme colorScheme) {
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return Column(
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children: [
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Container(
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width: 80,
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height: 80,
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decoration: BoxDecoration(
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color: colorScheme.primaryContainer,
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borderRadius: AppRadius.lgBorder,
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),
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child: Icon(
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Icons.edit_note_rounded,
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size: 44,
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color: colorScheme.primary,
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),
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),
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const SizedBox(height: DesignTokens.spacing16),
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Text(
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'暖记',
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style: Theme.of(context).textTheme.headlineLarge?.copyWith(
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fontWeight: FontWeight.bold,
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color: colorScheme.primary,
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),
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),
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const SizedBox(height: DesignTokens.spacing4),
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Text(
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'记录温暖，书写成长',
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style: Theme.of(context).textTheme.bodyMedium?.copyWith(
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color: colorScheme.onSurface.withValues(alpha: 0.6),
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),
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),
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],
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);
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}
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Widget _buildForm(BuildContext context, ThemeData theme, ColorScheme colorScheme) {
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return Form(
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key: _formKey,
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child: Column(
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children: [
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AnimatedSize(
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duration: DesignTokens.animNormal,
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curve: DesignTokens.warmCurve,
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child: AnimatedSwitcher(
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duration: DesignTokens.animNormal,
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child: _isRegister
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? Padding(
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key: const ValueKey('display-name'),
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padding: const EdgeInsets.only(bottom: DesignTokens.spacing16),
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child: TextFormField(
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controller: _displayNameController,
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decoration: InputDecoration(
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labelText: '昵称',
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hintText: '你想被叫什么名字？',
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prefixIcon: const Icon(Icons.face_rounded),
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border: OutlineInputBorder(
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borderRadius: AppRadius.mdBorder,
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),
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),
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textInputAction: TextInputAction.next,
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),
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)
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: const SizedBox.shrink(key: ValueKey('display-name-hide')),
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),
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),
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TextFormField(
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controller: _usernameController,
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decoration: InputDecoration(
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labelText: '账号',
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hintText: _isRegister ? '设置一个账号名' : '输入你的账号',
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prefixIcon: const Icon(Icons.person_rounded),
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border: OutlineInputBorder(
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borderRadius: AppRadius.mdBorder,
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),
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),
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textInputAction: TextInputAction.next,
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validator: (value) {
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if (value == null || value.trim().isEmpty) {
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return '请输入账号';
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}
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if (value.trim().length < 3) {
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return '账号至少需要 3 个字符';
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}
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return null;
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},
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),
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const SizedBox(height: DesignTokens.spacing16),
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TextFormField(
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controller: _passwordController,
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obscureText: _obscurePassword,
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decoration: InputDecoration(
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labelText: '密码',
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hintText: _isRegister ? '设置一个密码' : '输入你的密码',
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prefixIcon: const Icon(Icons.lock_rounded),
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suffixIcon: IconButton(
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icon: Icon(
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_obscurePassword
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? Icons.visibility_off_rounded
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: Icons.visibility_rounded,
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),
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onPressed: () {
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setState(() {
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_obscurePassword = !_obscurePassword;
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});
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},
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),
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border: OutlineInputBorder(
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borderRadius: AppRadius.mdBorder,
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),
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),
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textInputAction: TextInputAction.done,
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onFieldSubmitted: (_) => _submit(),
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validator: (value) {
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if (value == null || value.isEmpty) {
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return '请输入密码';
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}
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if (value.length < 6) {
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return '密码至少需要 6 个字符';
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}
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return null;
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},
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),
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],
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),
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);
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}
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Widget _buildSubmitButton(BuildContext context, ColorScheme colorScheme) {
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return BlocBuilder<AuthBloc, AuthState>(
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builder: (context, state) {
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final isLoading = state is Authenticating;
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return SizedBox(
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width: double.infinity,
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height: 52,
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child: FilledButton(
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onPressed: isLoading ? null : _submit,
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style: FilledButton.styleFrom(
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shape: RoundedRectangleBorder(
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borderRadius: AppRadius.mdBorder,
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),
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),
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child: isLoading
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? const SizedBox(
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width: 24,
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height: 24,
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child: CircularProgressIndicator(
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strokeWidth: 2.5,
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color: Colors.white,
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),
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)
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: Text(
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_isRegister ? '注册' : '登录',
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style: const TextStyle(fontSize: 16, fontWeight: FontWeight.w600),
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),
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),
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);
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},
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);
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}
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Widget _buildModeToggle(BuildContext context, ColorScheme colorScheme) {
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return TextButton(
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onPressed: () {
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setState(() {
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_isRegister = !_isRegister;
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});
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_formKey.currentState?.reset();
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},
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child: Text(
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_isRegister ? '已有账号？去登录' : '没有账号？去注册',
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style: TextStyle(color: colorScheme.primary),
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),
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);
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}
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Widget _buildErrorMessage(String message, ColorScheme colorScheme) {
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return Container(
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width: double.infinity,
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padding: const EdgeInsets.all(DesignTokens.spacing12),
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decoration: BoxDecoration(
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color: colorScheme.errorContainer,
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borderRadius: BorderRadius.circular(12),
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),
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child: Row(
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children: [
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Icon(Icons.info_outline_rounded, size: 20, color: colorScheme.onErrorContainer),
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const SizedBox(width: DesignTokens.spacing8),
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Expanded(
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child: Text(
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message,
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style: TextStyle(color: colorScheme.onErrorContainer, fontSize: 14),
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),
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),
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],
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),
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);
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}
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}
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