👨‍🏫0.2 Переменные и операторы

// Some code


import 'package:flutter/material.dart';

class Lesson15 extends StatefulWidget {
  const Lesson15({super.key});

  @override
  State<Lesson15> createState() => _Lesson15State();
}

class _Lesson15State extends State<Lesson15> {
  //  = String, int, double, bool,
  //
  // int double  = , +=, -=, *=, /=, %, ~/


  int number = 12;
  double numberOne = 456.0;
  int numberTwo = 1;


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: [
          Text('$number', style: TextStyle(fontSize: 40),),
          ElevatedButton(onPressed: (){
            setState(() {
              number *= 3;
            });

          }, child: Text('Умножить')),


          Text('$numberOne', style: TextStyle(fontSize: 40),),
          ElevatedButton(onPressed: (){
            setState(() {
              numberOne /= 3;
            });

          }, child: Text('Делить')),

          Row(
            children: [
              Text('$numberTwo', style: TextStyle(fontSize: 40),),
              IconButton(onPressed: (){
                setState(() {
                  numberTwo +=1;
                });

              }, icon: Icon(Icons.add_circle))
            ],
          )

        ],
      ),
    );
  }
}

// Some code
class Lesson15a extends StatefulWidget {
  const Lesson15a({super.key});

  @override
  State<Lesson15a> createState() => _Lesson15aState();
}

class _Lesson15aState extends State<Lesson15a> {

  bool isValue = false;
  bool isValueOne = false;

  bool isValueTwo = false;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: [
          Row(
            children: [
              Checkbox(
                activeColor: Colors.green,
                  checkColor: Colors.white,
                  value: isValue, onChanged: ( value){
                setState(() {
                  isValue = value!;
                });
              }),

              Text('Figma')
            ],
          ),

          Row(
            children: [
              Checkbox(
                  activeColor: Colors.green,
                  checkColor: Colors.white,
                  value: isValueOne, onChanged: ( value){
                setState(() {
                  isValueOne = value!;
                });
              }),

              Text('AdobeX')
            ],
          ),

          
        ],
      ),
    );
  }
}

class Lesson15b extends StatefulWidget {
  const Lesson15b({super.key});

  @override
  State<Lesson15b> createState() => _Lesson15bState();
}

class _Lesson15bState extends State<Lesson15b> {
  bool isSelected = false;
  bool isSelectedOne = false;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: ListView(
        shrinkWrap: true,
        padding: EdgeInsets.symmetric(horizontal: 20),
        children: [
          ChoiceChip(
            side: BorderSide.none,
            label: Row(
              children: [Image.asset('assets/leaf.png'), Text('Arabic')],
            ),
            selected: isSelected,
            onSelected: (value){
              setState(() {
                isSelected = value;dfghjkmhngbfvdcsxscdfgyuikujmfvdcsxaswqdewr4t5y6u7iolk,mnbvcsxertyjumb vcxzsdrtyjubnv cdsfertyjumbnvfdrtyjhbvcdsrthynb vcxsdawertyuk,yjmhnfbdscx
              });
            },
          ),
          ChoiceChip(
            side: BorderSide.none,
            label: Row(
              children: [Image.asset('assets/leaf.png'), Text('Arabic')],
            ),
            selected: isSelectedOne,
            onSelected: (value){
              setState(() {
                isSelectedOne = value;
              });
            },
          ),
        ],
      ),
    );
  }
}