👨‍🏫0.1 Переменные

import 'package:flutter/material.dart';

class Lesson14 extends StatefulWidget {
  const Lesson14({super.key});

  @override
  State<Lesson14> createState() => _Lesson14State();
}

class _Lesson14State extends State<Lesson14> {
  // String
  // int
  // double
  // bool - true - false

  String title = 'Жакшы';
  String doctor = 'Врач';
  int age = 19;
  double kg = 98.90;
  bool isMarried = true;

  double size = 70;

  // Color -
  // Widget -
  Color color = Colors.blue;


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: [
          Text(title, style: TextStyle(fontSize: size, color: color),),
          Text(title, style: TextStyle(fontSize: size, color: color),),
          Text(doctor),
          Text(doctor),
          Text(doctor),
          Text(doctor),
          Text(doctor),
          Text(doctor),
          Text(doctor),
          Text(doctor),
          Text('$age')
        ],
      ),
    );
  }
}

import 'package:flutter/material.dart';

class Lesson14 extends StatefulWidget {
  const Lesson14({super.key});

  @override
  State<Lesson14> createState() => _Lesson14State();
}

class _Lesson14State extends State<Lesson14> {
  // String
  // int
  // double
  // bool - true - false

  String title = 'Жакшы';
  String doctor = 'Врач';
  int age = 19;
  double kg = 98.90;
  bool isMarried = true;

  double size = 70;

  // Color -
  // Widget -
  Color color = Colors.blue;
  FontWeight weight = FontWeight.bold;

  Widget textOne = Text(
    'Жакшы',
    style: TextStyle(
      fontSize: 40,
      fontWeight: FontWeight.bold,
      color: Colors.black,
    ),
  );

  Widget textTwo = Text(
    'Хиррург',
    style: TextStyle(
      fontSize: 40,
      fontWeight: FontWeight.bold,
      color: Colors.black,
    ),
  );

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(children: [textOne, textOne, textOne, textOne, textOne, textTwo]),
    );
  }
}

import 'package:flutter/material.dart';

class Lesson14 extends StatefulWidget {
  const Lesson14({super.key});

  @override
  State<Lesson14> createState() => _Lesson14State();
}

class _Lesson14State extends State<Lesson14> {
  // String
  // int
  // double
  // bool - true - false

  String title = 'Жакшы';
  String doctor = 'Врач';
  int age = 19;
  double kg = 98.90;
  bool isMarried = true;

  double size = 70;

  // Color -
  // Widget -
  Color color = Colors.blue;
  FontWeight weight = FontWeight.bold;

  Widget textOne = Text(
    'Жакшы',
    style: TextStyle(
      fontSize: 40,
      fontWeight: FontWeight.bold,
      color: Colors.black,
    ),
  );

  Widget textTwo = Text(
    'Хиррург',
    style: TextStyle(
      fontSize: 40,
      fontWeight: FontWeight.bold,
      color: Colors.black,
    ),
  );

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: [textOne, textOne, textOne, textOne, textOne, textTwo],
      ),
    );
  }
}

// Some code
class Lesson14a extends StatefulWidget {
  const Lesson14a({super.key});

  @override
  State<Lesson14a> createState() => _Lesson14aState();
}

class _Lesson14aState extends State<Lesson14a> {

  Widget card = Container(
    decoration: BoxDecoration(
      borderRadius: BorderRadius.circular(20),
      border: Border.all(color: Colors.black),
    ),
    child: Column(
      children: [
        Image.asset('assets/coke.png')
      ],
    ),
  );

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: GridView(
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
          crossAxisCount: 2,
          mainAxisSpacing: 10, crossAxisSpacing: 10, childAspectRatio: 0.7
        ),
        children: [
          card, card, card, card, card, card
        ],
      ),
    );
  }
}

class Lesson14b extends StatefulWidget {
  const Lesson14b({super.key});

  @override
  State<Lesson14b> createState() => _Lesson14bState();
}

class _Lesson14bState extends State<Lesson14b> {
  String title = 'Жакшы';
  String data = 'Огромный';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: [
          Text(title, style: TextStyle(fontSize: 60)),
          SizedBox(height: 30),
          ElevatedButton(
            onPressed: () {
              setState(() {
                title = 'Жаман';
              });
            },
            child: Text('Менять'),
          ),

          SizedBox(height: 50),
          Text(data, style: TextStyle(fontSize: 60)),
          SizedBox(height: 30),
          ElevatedButton(
            onPressed: () {
              setState(() {
                data = 'Маленький';
              });
            },
            child: Text('Менять'),
          ),
        ],
      ),
    );
  }
}