Belajar Flutter Layout

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Flutter Demo',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        // home: Container(
        //     color: Colors.blue[200],
        //     width: 50,
        //     height: 90,
        //     padding: const EdgeInsets.all(20.0),
        //     child: Container(
        //       child: const Text('Hello World',
        //           style: TextStyle(
        //               color: Colors.white, decoration: TextDecoration.lineThrough)),
        //       color: Colors.red,
        //       )
        //     )
        home: Column(
          children: [
            Container(
              child: Text('K1', style: TextStyle(fontSize: 30.0, color: Colors.white)),
              margin: const EdgeInsets.all(20),
              width: 50,
            ),
            Container(
              child: Text(
                'K2', 
                style: TextStyle(
                  fontSize: 30.0,
                  color: Colors.white
                )
              ),
              margin: const EdgeInsets.all(20),
              width: 50,
            ),
            Container(
              child: Text('K3', style: TextStyle(fontSize: 30.0, color: Colors.white)),
              margin: const EdgeInsets.all(20),
              width: 50,
            ),
          ],
        ));
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);
  final String title;
  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}