153 lines
No EOL
4.8 KiB
Dart
153 lines
No EOL
4.8 KiB
Dart
import 'package:contacts_plus_plus/api_client.dart';
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import 'package:contacts_plus_plus/models/authentication_data.dart';
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import 'package:flutter/material.dart';
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class LoginScreen extends StatefulWidget {
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const LoginScreen({this.onLoginSuccessful, this.cachedUsername, super.key});
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final String? cachedUsername;
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final Function(AuthenticationData)? onLoginSuccessful;
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@override
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State<StatefulWidget> createState() => _LoginScreenState();
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}
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class _LoginScreenState extends State<LoginScreen> {
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final TextEditingController _usernameController = TextEditingController();
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final TextEditingController _passwordController = TextEditingController();
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late final Future<AuthenticationData> _cachedLoginFuture = ApiClient.tryCachedLogin().then((value) async {
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if (value.isAuthenticated) {
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await widget.onLoginSuccessful?.call(value);
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}
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return value;
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});
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late final FocusNode _passwordFocusNode;
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bool _isLoading = false;
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String _error = "";
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double get _errorOpacity => _error.isEmpty ? 0.0 : 1.0;
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@override
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void initState() {
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super.initState();
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_usernameController.text = widget.cachedUsername ?? "";
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_passwordFocusNode = FocusNode();
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}
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@override
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void dispose() {
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_passwordFocusNode.dispose();
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super.dispose();
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}
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Future<void> submit() async {
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if (_usernameController.text.isEmpty || _passwordController.text.isEmpty) {
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setState(() {
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_error = "Please enter a valid username/password combination.";
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});
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return;
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}
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setState(() {
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_error = "";
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_isLoading = true;
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});
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try {
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final authData = await ApiClient.tryLogin(
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username: _usernameController.text,
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password: _passwordController.text
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);
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if (!authData.isAuthenticated) {
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setState(() {
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_error = "Login unsuccessful: Server sent invalid response.";
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_isLoading = false;
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});
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return;
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}
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setState(() {
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_error = "";
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_isLoading = false;
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});
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await widget.onLoginSuccessful?.call(authData);
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} catch (e, s) {
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FlutterError.reportError(FlutterErrorDetails(exception: e, stack: s));
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setState(() {
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_error = "Login unsuccessful: $e.";
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_isLoading = false;
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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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return Scaffold(
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body: FutureBuilder(
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future: _cachedLoginFuture,
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builder: (context, snapshot) {
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if (snapshot.hasData || snapshot.hasError) {
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final authData = snapshot.data;
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if (authData?.isAuthenticated ?? false) {
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return const SizedBox.shrink();
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}
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return Column(
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crossAxisAlignment: CrossAxisAlignment.center,
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children: [
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Padding(
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padding: const EdgeInsets.symmetric(vertical: 32),
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child: Text("Sign In", style: Theme
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.of(context)
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.textTheme
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.headlineMedium),
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),
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const Spacer(),
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Padding(
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padding: const EdgeInsets.symmetric(vertical: 16, horizontal: 64),
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child: TextField(
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autofocus: true,
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controller: _usernameController,
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onEditingComplete: () => _passwordFocusNode.requestFocus(),
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decoration: const InputDecoration(
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border: OutlineInputBorder(),
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labelText: 'Username',
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),
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),
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),
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Padding(
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padding: const EdgeInsets.symmetric(vertical: 16, horizontal: 64),
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child: TextField(
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controller: _passwordController,
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focusNode: _passwordFocusNode,
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onEditingComplete: submit,
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obscureText: true,
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decoration: const InputDecoration(
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border: OutlineInputBorder(),
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labelText: 'Password',
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),
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),
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),
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if (_isLoading)
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const Center(child: CircularProgressIndicator())
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else
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TextButton.icon(
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onPressed: submit,
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icon: const Icon(Icons.login),
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label: const Text("Login"),
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),
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AnimatedOpacity(
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opacity: _errorOpacity,
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duration: const Duration(milliseconds: 200),
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child: Padding(
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padding: const EdgeInsets.symmetric(vertical: 16, horizontal: 64),
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child: Text(_error, style: Theme.of(context).textTheme.labelMedium?.copyWith(color: Colors.red)),
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),
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)
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],
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);
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}
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return const Center(child: CircularProgressIndicator(),);
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}
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),
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);
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}
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} |