BotZ_app/lib/ui/credentials_form.dart

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import 'package:flutter/material.dart';
import 'package:logger/logger.dart';
import 'package:shared_preferences/shared_preferences.dart';
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final log = Logger();
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class CredentialsForm extends StatefulWidget {
CredentialsForm({@required this.defaultNextRoute, Key key}) : super(key: key);
final String defaultNextRoute;
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@override
_CredentialsState createState() => _CredentialsState();
}
class _CredentialsState extends State<CredentialsForm> {
static String title = "Credentials";
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String username;
String password;
bool _hidden = true;
final _credFormKey = GlobalKey<FormState>();
final _scaffoldKey = GlobalKey<ScaffoldState>();
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InputDecoration _textFieldDecoration(String label, IconData icon) {
return InputDecoration(
labelText: label,
icon: Icon(icon),
hintText: 'Please, insert your zucchetti account $label',
);
}
String validateUsername(String username) {
if (username.isEmpty) {
return 'Username must not be empty';
}
return null;
}
String validatePassword(String password) {
if (password.isEmpty) {
return 'Password must not be empty';
}
return null;
}
Future<String> getNextRoute() async {
var persistence = await SharedPreferences.getInstance();
String nextRoute = persistence.getString("nextRoute");
if (nextRoute != null) {
log.d("nextRoute: $nextRoute");
return nextRoute;
}
log.d("defaultNextRoute: ${widget.defaultNextRoute}");
return null;
}
Future<void> _onPressed() async {
var persistence = await SharedPreferences.getInstance();
if (_credFormKey.currentState.validate()) {
_scaffoldKey.currentState
.showSnackBar(SnackBar(content: Text('Processing Data')));
}
_credFormKey.currentState.save();
log.d("username: ${this.username}\tpassword: ${this.password}");
persistence.setString("username", this.username);
persistence.setString("password", this.password);
String nextRoute = await getNextRoute();
if (nextRoute == null) {
Navigator.pushNamedAndRemoveUntil(
context, widget.defaultNextRoute, (Route<dynamic> route) => false);
} else {
Navigator.pushNamed(context, nextRoute);
}
}
Form theForm() => Form(
key: _credFormKey,
child: Column(children: <Widget>[
TextFormField(
autofocus: true,
autocorrect: false,
decoration:
this._textFieldDecoration("username", Icons.alternate_email),
validator: this.validateUsername,
onSaved: (String user) {
username = user;
}),
TextFormField(
autocorrect: false,
decoration: this._textFieldDecoration("password", Icons.lock),
validator: this.validatePassword,
obscureText: this._hidden,
onSaved: (String pass) {
password = pass;
}),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
RaisedButton(
onPressed: this._onPressed,
child: Text('Validate'),
),
Row(children: <Widget>[
Text('Reveal password'),
Checkbox(
value: !this._hidden,
onChanged: (bool value) {
setState(() {
_hidden = !value;
});
return;
})
])
]),
]));
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@override
Widget build(BuildContext context) {
return Scaffold(
key: _scaffoldKey, appBar: AppBar(title: Text(title)), body: theForm());
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}
}