Commit 726edcf4 by nayeli92433

creacion de tres paginas login, home, articles

parent e3c6cab1
import 'package:flutter/material.dart';
class PantallaInicioSesion extends StatefulWidget {
@override
_PantallaInicioSesionState createState() => _PantallaInicioSesionState();
}
class _PantallaInicioSesionState extends State<PantallaInicioSesion> {
final _formKey = GlobalKey<FormState>();
final TextEditingController _usuarioController = TextEditingController();
final TextEditingController _contrasenaController = TextEditingController();
void _iniciarSesion() {
if (_formKey.currentState!.validate()) {
Navigator.pushReplacementNamed(context, '/categorias');
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Inicio de Sesión'),
),
body: Padding(
padding: EdgeInsets.all(16.0),
child: Form(
key: _formKey,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
TextFormField(
controller: _usuarioController,
decoration: InputDecoration(labelText: 'Usuario'),
validator: (value) {
if (value!.isEmpty) {
return 'Por favor ingrese su usuario';
}
return null;
},
),
TextFormField(
controller: _contrasenaController,
decoration: InputDecoration(labelText: 'Contraseña'),
obscureText: true,
validator: (value) {
if (value!.isEmpty) {
return 'Por favor ingrese su contraseña';
}
return null;
},
),
SizedBox(height: 20),
ElevatedButton(
onPressed: _iniciarSesion,
child: Text('Iniciar Sesión'),
),
],
),
),
),
);
}
}
import 'package:flutter/material.dart';
import 'login.dart';
void main() {
runApp(const MyApp());
}
......@@ -10,37 +7,119 @@ void main() {
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// TRY THIS: Try running your application with "flutter run". You'll see
// the application has a purple toolbar. Then, without quitting the app,
// try changing the seedColor in the colorScheme below to Colors.green
// and then invoke "hot reload" (save your changes or press the "hot
// reload" button in a Flutter-supported IDE, or press "r" if you used
// the command line to start the app).
//
// Notice that the counter didn't reset back to zero; the application
// state is not lost during the reload. To reset the state, use hot
// restart instead.
//
// This works for code too, not just values: Most code changes can be
// tested with just a hot reload.
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
useMaterial3: true,
),
initialRoute: '/',
routes: {
'/': (context) => PantallaInicioSesion(),
'/categorias': (context) => CategoriasListScreen(),
},
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
// Aquí va tu CategoriasListScreen para la pantalla de categorías.
// Crea un archivo llamado categorias_list_screen.dart en la carpeta lib/screens
// y define la pantalla de categorías. Aquí tienes un ejemplo básico:
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
class CategoriasListScreen extends StatelessWidget {
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
title: Text('Categorias'),
// TRY THIS: Try changing the color here to a specific color (to
// Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
// change color while the other colors stay the same.
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
child: Text('Lista de Categorías'),
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
//
// TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
// action in the IDE, or press "p" in the console), to see the
// wireframe for each widget.
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headlineMedium,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment