Deliver localized auth app with verification and go_router
Integrate themed login/signup, EN/RU localization, shared dummy providers, verification recovery screens and named URL routes. Store frontend guidelines, workflow skills, validation and delivery documentation. Related to #2, #3, #5 and #6.
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import 'package:flutter/material.dart';
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import 'package:go_router/go_router.dart';
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import 'package:provider/provider.dart';
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import 'package:sxchnge_auth/sxchnge_auth.dart';
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import '../routing/routes.dart';
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import 'feedback.dart';
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import 'validation.dart';
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import '../generated/i18n/app_localizations.dart';
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class AuthForm extends StatefulWidget {
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const AuthForm({super.key});
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@override
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State<AuthForm> createState() => _AuthFormState();
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}
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class _AuthFormState extends State<AuthForm> {
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final _form = GlobalKey<FormState>();
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final _password = TextEditingController();
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final _confirmation = TextEditingController();
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bool _signUp = false;
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bool _showPassword = false;
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bool _showConfirmation = false;
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bool _submitted = false;
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final _email = TextEditingController();
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final _name = TextEditingController();
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AuthProvider get _provider =>
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_signUp ? context.read<SignupProvider>() : context.read<LoginProvider>();
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Locale? _lastLocale;
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@override
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void didChangeDependencies() {
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super.didChangeDependencies();
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final locale = Localizations.localeOf(context);
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if (_lastLocale != null && _lastLocale != locale && _submitted) {
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (mounted) _form.currentState?.validate();
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});
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}
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_lastLocale = locale;
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}
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@override
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void dispose() {
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_email.dispose();
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_name.dispose();
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_password.dispose();
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_confirmation.dispose();
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super.dispose();
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}
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void _switch(bool signUp) {
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if (signUp == _signUp) return;
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context.read<LoginProvider>().reset();
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context.read<SignupProvider>().reset();
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_form.currentState?.reset();
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_password.clear();
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_confirmation.clear();
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setState(() {
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_signUp = signUp;
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_submitted = false;
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_showPassword = false;
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_showConfirmation = false;
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});
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}
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Future<void> _submit() async {
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if (_provider.state.isLoading) return;
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setState(() => _submitted = true);
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if (!_form.currentState!.validate()) return;
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FocusScope.of(context).unfocus();
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final locale = Localizations.localeOf(context).toLanguageTag();
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if (_signUp) {
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final signup = context.read<SignupProvider>();
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await signup.signup(
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name: _name.text,
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email: _email.text,
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password: _password.text,
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locale: locale,
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);
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if (!mounted || !_signUp || signup.state.status != AuthStatus.success) {
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return;
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}
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final email = _email.text.trim();
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_password.clear();
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_confirmation.clear();
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context.goNamed(AppRoutes.verificationSent, extra: email);
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} else {
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await context.read<LoginProvider>().login(
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email: _email.text,
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password: _password.text,
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locale: locale,
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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 login = context.watch<LoginProvider>();
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final signup = context.watch<SignupProvider>();
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final state = (_signUp ? signup : login).state;
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final l = AppLocalizations.of(context)!;
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final theme = Theme.of(context);
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final colors = theme.colorScheme;
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final text = theme.textTheme;
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return Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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Align(
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alignment: Alignment.centerLeft,
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child: Container(
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padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
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decoration: ShapeDecoration(
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color: colors.tertiaryContainer,
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shape: const StadiumBorder(),
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),
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child: Text(
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l.nextChapter,
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style: text.labelSmall!.copyWith(
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color: colors.onTertiaryContainer,
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letterSpacing: 0.8,
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),
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),
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),
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),
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const SizedBox(height: 24),
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Text(
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_signUp ? l.signupHeading : l.loginHeading,
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style: text.displayMedium,
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),
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const SizedBox(height: 16),
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Text(
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_signUp ? l.signupIntro : l.loginIntro,
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style: text.bodyLarge!.copyWith(color: colors.onSurfaceVariant),
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),
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const SizedBox(height: 32),
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SegmentedButton<bool>(
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showSelectedIcon: false,
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segments: [
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ButtonSegment(value: false, label: Text(l.login)),
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ButtonSegment(value: true, label: Text(l.signup)),
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],
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selected: {_signUp},
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onSelectionChanged: (selected) => _switch(selected.single),
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expandedInsets: EdgeInsets.zero,
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),
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const SizedBox(height: 32),
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Form(
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key: _form,
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autovalidateMode: _submitted
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? AutovalidateMode.onUserInteraction
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: AutovalidateMode.disabled,
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onChanged: () {
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if (_provider.state.status == AuthStatus.success ||
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_provider.state.status == AuthStatus.error) {
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_provider.reset();
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}
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},
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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if (_signUp) ...[
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TextFormField(
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key: const ValueKey('name'),
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controller: _name,
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enabled: !state.isLoading,
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decoration: InputDecoration(
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labelText: l.name,
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prefixIcon: Icon(Icons.person_outline),
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errorMaxLines: 3,
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),
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textInputAction: TextInputAction.next,
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textCapitalization: TextCapitalization.words,
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validator: (value) => AuthValidation.name(value, l),
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),
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const SizedBox(height: 20),
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],
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TextFormField(
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key: const ValueKey('email'),
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controller: _email,
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enabled: !state.isLoading,
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decoration: InputDecoration(
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labelText: l.email,
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hintText: l.emailHint,
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prefixIcon: Icon(Icons.alternate_email),
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errorMaxLines: 3,
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),
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keyboardType: TextInputType.emailAddress,
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textInputAction: TextInputAction.next,
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autocorrect: false,
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validator: (value) => AuthValidation.email(value, l),
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),
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const SizedBox(height: 20),
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TextFormField(
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key: const ValueKey('password'),
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enabled: !state.isLoading,
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controller: _password,
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obscureText: !_showPassword,
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autocorrect: false,
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enableSuggestions: false,
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textInputAction: _signUp
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? TextInputAction.next
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: TextInputAction.done,
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onFieldSubmitted: (_) {
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if (!_signUp) _submit();
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},
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decoration: InputDecoration(
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labelText: l.password,
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prefixIcon: const Icon(Icons.lock_outline),
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errorMaxLines: 3,
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helperText: _signUp ? l.passwordHint : null,
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helperMaxLines: 3,
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suffixIcon: IconButton(
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tooltip: _showPassword ? l.hidePassword : l.showPassword,
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onPressed: () =>
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setState(() => _showPassword = !_showPassword),
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icon: Icon(
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_showPassword
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? Icons.visibility_off_outlined
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: Icons.visibility_outlined,
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),
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),
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),
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validator: (value) =>
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AuthValidation.password(value, l, signUp: _signUp),
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),
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if (_signUp) ...[
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const SizedBox(height: 20),
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TextFormField(
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key: const ValueKey('confirmation'),
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enabled: !state.isLoading,
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controller: _confirmation,
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obscureText: !_showConfirmation,
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autocorrect: false,
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enableSuggestions: false,
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textInputAction: TextInputAction.done,
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onFieldSubmitted: (_) => _submit(),
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decoration: InputDecoration(
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labelText: l.confirmPassword,
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prefixIcon: const Icon(Icons.lock_outline),
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errorMaxLines: 3,
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suffixIcon: IconButton(
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tooltip: _showConfirmation
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? l.hideConfirmation
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: l.showConfirmation,
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onPressed: () => setState(
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() => _showConfirmation = !_showConfirmation,
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),
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icon: Icon(
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_showConfirmation
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? Icons.visibility_off_outlined
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: Icons.visibility_outlined,
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),
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),
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),
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validator: (value) =>
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AuthValidation.confirmation(value, _password.text, l),
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),
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],
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const SizedBox(height: 28),
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FilledButton(
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key: const ValueKey('submit'),
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onPressed: state.isLoading ? null : _submit,
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child: Padding(
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padding: const EdgeInsets.symmetric(vertical: 4),
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child: Row(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Flexible(
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child: Text(
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state.isLoading
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? l.authWorking
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: (_signUp ? l.createAccount : l.letsGo),
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textAlign: TextAlign.center,
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),
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),
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const SizedBox(width: 12),
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state.isLoading
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? const SizedBox(
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width: 20,
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height: 20,
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child: CircularProgressIndicator(strokeWidth: 2),
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)
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: const Icon(Icons.arrow_forward, size: 20),
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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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if (state.status == AuthStatus.success ||
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state.status == AuthStatus.error) ...[
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const SizedBox(height: 20),
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AuthFeedback(state: state, signUp: _signUp),
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],
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const SizedBox(height: 20),
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Wrap(
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alignment: WrapAlignment.center,
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crossAxisAlignment: WrapCrossAlignment.center,
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children: [
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Text(
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_signUp ? l.alreadyMember : l.newHere,
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style: text.bodySmall!.copyWith(color: colors.onSurfaceVariant),
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),
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TextButton(
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onPressed: () => _switch(!_signUp),
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child: Text(_signUp ? l.loginInstead : l.createAnAccount),
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),
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],
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),
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const SizedBox(height: 24),
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const Divider(),
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const SizedBox(height: 16),
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Text(
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l.earlyPreview,
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textAlign: TextAlign.center,
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style: text.bodySmall!.copyWith(color: colors.onSurfaceVariant),
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),
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],
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);
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}
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}
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