Abstract Classes

readme.md

Abstract Classes Chapter 1

Created with <3 with dartpad.dev.

abstractClasses1.dart

import 'package:flutter/material.dart';
import 'dart:developer' as devtools show log;

extension Log on Object {
  void log() => devtools.log(toString());
}

enum Type { cat, dog }

abstract class CanRun {
  final Type type;
  const CanRun({required this.type});

  @mustCallSuper
  void run() {
    "CanRun func is called".log();
  }
}

class Dog extends CanRun {
  const Dog() : super(type: Type.dog);
}

class Cat extends CanRun {
  const Cat() : super(type: Type.cat);

  @override
  run() {
    super.run();
    "Cat func is called".log();
  }
}

void testIt() {
  const cat = Cat();
  cat.type.log();

  const dog = Dog();
  dog.type.log();
}


abstract class CanSee{
  void see(){
    "Sight...".log();
  } 
}

abstract class CanHunt{
  void hunt(){
    "Hunting...".log();
  } 
}

class BigCat with CanSee, CanHunt{  
}


void observe(){
  final bigCat = BigCat();
//   bigCat.see();
//   bigCat.hunt();
  bigCat..see()..hunt();
}

void main() {
  'Hello'.log();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    testIt();
    observe();
    return MaterialApp(
      theme: ThemeData.dark().copyWith(
        scaffoldBackgroundColor: Colors.amberAccent,
      ),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Text(
      'Hello, World!',
      style:
          Theme.of(context).textTheme.headline5!.copyWith(color: Colors.black),
    );
  }
}