Ajout de produit

add_product.dart

import 'package:flutter/material.dart';

import 'product.dart';

class AddProduct extends StatefulWidget {
  const AddProduct({Key? key}) : super(key: key);

  @override
  _AddProductState createState() => _AddProductState();
}

class _AddProductState extends State<AddProduct> {
  final _formKey = GlobalKey<FormState>();
  final _nameController = TextEditingController();
  final _priceController = TextEditingController();

  void _addProduct(BuildContext context) {
    if (_formKey.currentState!.validate()) {
      final name = _nameController.text;
      final price = double.tryParse(_priceController.text) ?? 0.0;
      final product = Product(name: name, price: price);

      Navigator.pop(context, product);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Add a product'),
      ),
      body: Form(
        key: _formKey,
        child: Column(
          children: [
            TextFormField(
              controller: _nameController,
              decoration: InputDecoration(
                labelText: 'Name',
              ),
              validator: (value) {
                if (value!.isEmpty) {
                  return 'Please enter a name';
                }
                return null;
              },
            ),
            TextFormField(
              controller: _priceController,
              keyboardType: TextInputType.number,
              decoration: InputDecoration(
                labelText: 'Price',
              ),
              validator: (value) {
                if (value!.isEmpty) {
                  return 'Please enter a price';
                }
                final price = double.tryParse(value);
                if (price == null || price <= 0.0) {
                  return 'Please enter a valid price';
                }
                return null;
              },
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () => _addProduct(context),
        child: const Icon(Icons.check),
      ),
    );
  }
}