👨‍🏫0.3 Переменные bool

import 'package:flutter/material.dart';

class Lesson16 extends StatefulWidget {
  const Lesson16({super.key});

  @override
  State<Lesson16> createState() => _Lesson16State();
}

class _Lesson16State extends State<Lesson16> {
  bool isSelected = false;

  bool isSelectedOne = false;

  bool isSelectedTwo = false;

  int number = 1;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: [
          IconButton(
            isSelected: isSelected,
            onPressed: () {
              setState(() {
                isSelected = !isSelected;
              });
            },
            icon: Icon(Icons.favorite_border, size: 40),
            selectedIcon: Icon(Icons.favorite, size: 40, color: Colors.red),
          ),

          IconButton(
            isSelected: isSelectedOne,
            onPressed: () {
              setState(() {
                isSelectedOne = !isSelectedOne;
              });
            },
            icon: Text('Хирург'),
            selectedIcon: Container(
              height: 50,
              width: 100,
              color: Colors.orange,
              child: Text('Умножить'),
            ),
          ),

          IconButton(
            isSelected: isSelectedTwo,
            onPressed: () {
              setState(() {
                isSelectedTwo = true;
              });
            },
            icon: Row(
              mainAxisSize: .min,
              children: [Icon(Icons.shopping_cart), Text('add to cart')],
            ),
            selectedIcon: Row(
              children: [
                IconButton(onPressed: () {
                  setState(() {
                    number -= 1;
                  });
                }, icon: Icon(Icons.remove_circle)),
                Text('$number'),
                IconButton(onPressed: (){
                  setState(() {
                    number += 1;
                  });
                }, icon: Icon(Icons.add_circle))
              ],
            ),
          ),
        ],
      ),
    );
  }
}

class Lesson16a extends StatefulWidget {
  const Lesson16a({super.key});

  @override
  State<Lesson16a> createState() => _Lesson16aState();
}

class _Lesson16aState extends State<Lesson16a> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: GridView(
        padding: EdgeInsets.all(10),
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
          crossAxisCount: 2,
          mainAxisSpacing: 10,
          crossAxisSpacing: 10,
          childAspectRatio: 0.68,
        ),
        children: [
          SizedBox(

            child: Column(
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Align(
                  alignment: Alignment.topRight,
                  child: IconButton(
                    onPressed: () {},
                    icon: Icon(Icons.favorite_border),
                  ),
                ),
                SizedBox(
                  height: 150,
                  child: Stack(
                    children: [
                      Align(
                        alignment: Alignment.center,
                        child: CircleAvatar(
                          radius: 55,
                          backgroundColor: Colors.green,
                        ),
                      ),
                      Align(
                        alignment: Alignment.center,
                        child: Padding(
                          padding: const EdgeInsets.only(top: 20),
                          child: Image.asset(
                            'assets/peach2.png',
                            width: 130,
                            height: 150,
                          ),
                        ),
                      ),
                    ],
                  ),
                ),
                Text('809'),
                Text('Peach'),
                Text('Fresh'),
                Divider(),
                Row(children: [],)
              ],
            ),
          ),
          SizedBox(),
        ],
      ),
    );
  }
}