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import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: HomePage(),
    );

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class DetailsPage extends StatelessWidget {
  const DetailsPage({super.key});

  @override
  Widget build(BuildContext context) {
    log('DetailsPage');
    return Scaffold(
      appBar: AppBar(),
      body: const Center(
        child: Padding(

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class HomePage extends StatelessWidget {
  const HomePage({super.key});

  @override
  Widget build(BuildContext context) {
    log('HomePage');
    return Scaffold(
      appBar: AppBar(),
      body: Center(
        child: Text(

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class EnsureTextFieldVisible extends StatelessWidget {
  const EnsureTextFieldVisible({super.key});

  @override
  Widget build(BuildContext context) {
    // for validation
    final key = GlobalKey();
    // to learn the position of the widget
    final formKey = GlobalKey<FormState>();
    return Scaffold(

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class UnfocusArea extends StatelessWidget {
  const UnfocusArea({super.key, required this.child});
  final Widget child;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      // Makes clickable on everywhere even if the widget is not opaque
      behavior: HitTestBehavior.opaque,
      // Magic happens here

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class UnfocusOnScroll extends StatelessWidget {
  const UnfocusOnScroll({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Unfocus on scroll'),
        bottom: const PreferredSize(
          preferredSize: Size.fromHeight(60),

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class DoubleBack extends StatefulWidget {
  const DoubleBack({super.key, required this.child});
  final Widget child;

  @override
  State<DoubleBack> createState() => _DoubleBackState();
}

class _DoubleBackState extends State<DoubleBack> {
  DateTime? pressedTime;

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

  @override
  State<RememberScrollPosition> createState() => _RememberScrollPositionState();
}

class _RememberScrollPositionState extends State<RememberScrollPosition> {
  int currentIndex = 0;

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class NextFocusOnEnter extends StatelessWidget {
  const NextFocusOnEnter({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Next focus on enter'),
      ),
      body: Column(

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class AutoFocusOnOpen extends StatelessWidget {
  const AutoFocusOnOpen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Auto focus on open'),
      ),
      body: const Center(