FlutterKaigi demo

main.dart

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

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

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  bool _isTop = true;
  final _title = 'RenderObject とは何か？\nanimated_to に学ぶレイアウト計算と描画の仕組み';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: GestureDetector(
          behavior: HitTestBehavior.opaque,
          onTap: () {
            setState(() => _isTop = !_isTop);
          },
          child: Container(
            width: double.infinity,
            height: double.infinity,
            padding: const EdgeInsets.all(20),
            child: Align(
              alignment: _isTop ? Alignment.topCenter : Alignment.bottomCenter,
              child: Text(
                _title,
                style: TextStyle(fontSize: 18),
                textAlign: TextAlign.center,
              ),
            ),
          ),
        ),
      ),
    );
  }
}