test_inheritance

test_inheritance.dart

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

void main() {
  const isCat = false;
  runApp(
    Provider<Animal>(
      create: (context) {
        debugPrint('create');
        return isCat
            ? Cat(name: 'Whiskers', meows: 'meow')
            : Dog(name: 'Fido', barks: 'woof');
      },
      child: MaterialApp(
        home: Scaffold(
          appBar: AppBar(
            title: const Text('Hello World'),
          ),
          body: const Column(
            children: [
              DogWidget(),
              CommonWidget(),
            ],
          ),
        ),
      ),
    ),
  );
}

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

  @override
  Widget build(BuildContext context) {
    return Text(
      context.read<Animal>().name,
    );
  }
}


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

  @override
  Widget build(BuildContext context) {
    return Text(
      context.read<Dog>().barks,
    );
  }
}


abstract class Animal {
  Animal({
    required this.name
  });
  String name;
}

class Dog extends Animal {
  Dog({
    required super.name,
    required this.barks,
  });

  String barks;
}

class Cat extends Animal {
  Cat({
    required super.name,
    required this.meows,
  });

  String meows;
}