dynamic_constructor 1.0.0

A flexible utility to dynamically instantiate classes and invoke constructors using positional and named parameters from dynamic data sources.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:dynamic_constructor/dynamic_constructor.dart';

void main() {
  runApp(const MyApp());
}

class User {
  final String name;
  final int age;
  final String email;

  User(this.name, this.age, {required this.email});

  @override
  String toString() => 'User(name: $name, age: $age, email: $email)';
}

class Product {
  final String id;
  final String title;
  final double price;

  Product({required this.id, required this.title, this.price = 0.0});

  @override
  String toString() => 'Product(id: $id, title: $title, price: $price)';
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Dynamic Constructor Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  User? _user;
  Product? _product;

  void _createObjects() {
    // Creating a User using positional and named arguments
    final userConstructor = DynamicConstructor<User>(
      User.new,
      ['John Doe', 30, {'email': '[e-mail]'}],
    );

    // Creating a Product using only named arguments
    final productConstructor = DynamicConstructor<Product>(
      Product.new,
      {
        'id': 'PROD-001',
        'title': 'Premium Coffee'
      },
    );

    setState(() {
      _user = userConstructor.instance;
      _product = productConstructor.instance;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Dynamic Constructor Demo'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            if (_user != null) ...[
              const Text('Created User:'),
              Text(_user.toString(), style: const TextStyle(fontWeight: FontWeight.bold)),
              const SizedBox(height: 20),
            ],
            if (_product != null) ...[
              const Text('Created Product:'),
              Text(_product.toString(), style: const TextStyle(fontWeight: FontWeight.bold)),
              const SizedBox(height: 20),
            ],
            ElevatedButton(
              onPressed: _createObjects,
              child: const Text('Create Objects Dynamically'),
            ),
          ],
        ),
      ),
    );
  }
}