הפיכת כפתור לאפור

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: const HomePage(),
    );
  }
}

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

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  int _items = 0;

  void _add() {
    setState(() {
      _items++;
    });
  }

  void _remove() {
    setState(() {
      _items--;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Cart')),
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Text('Items: $_items', style: const TextStyle(fontSize: 24)),
            const SizedBox(height: 16),
            ElevatedButton(onPressed: _add, child: const Text('Add')),
            ElevatedButton(onPressed: _remove, child: const Text('Remove')),
          ],
        ),
      ),
    );
  }
}