import 'package:flutter/material.dart';

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

final hasCustomActionIconsNotifier = ValueNotifier(true);

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

  @override
  Widget build(BuildContext context) {
    final localization = MaterialLocalizations.of(context);
    return Icon(
      Icons.more_horiz_rounded,
      semanticLabel: localization.openAppDrawerTooltip,
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    final localization = MaterialLocalizations.of(context);
    return Icon(
      Icons.segment_rounded,
      semanticLabel: localization.openAppDrawerTooltip,
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: hasCustomActionIconsNotifier,
      builder: (context, _) {
        final isCustomActionIconsEnabled = hasCustomActionIconsNotifier.value;
        return MaterialApp(
          title: 'Flutter Demo',
          debugShowCheckedModeBanner: false,
          theme: ThemeData(
            useMaterial3: true,
            actionButtonIcons: isCustomActionIconsEnabled
                ? ActionButtonIconsData(
                    backButtonIconBuilder: (context) {
                      return const Icon(Icons.arrow_back_ios_new_rounded);
                    },
                    drawerButtonIconBuilder: (context) {
                      return const _DrawerButton();
                    },
                    endDrawerButtonIconBuilder: (context) {
                      return const _EndDrawerButton();
                    },
                  )
                : null,
          ),
          home: const MyHomePage(title: 'Flutter Demo Home Page'),
        );
      },
    );
  }
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(title),
      ),
      drawer: const Drawer(),
      body: Center(
        child: Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Flexible(
              child: ConstrainedBox(
                constraints: const BoxConstraints(
                  maxWidth: 600,
                ),
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    AnimatedBuilder(
                      animation: hasCustomActionIconsNotifier,
                      builder: (context, _) {
                        return SwitchListTile(
                          value: hasCustomActionIconsNotifier.value,
                          onChanged: (value) {
                            hasCustomActionIconsNotifier.value = value;
                          },
                          title: const Text('Enable custom action icons'),
                        );
                      },
                    ),
                    ListTile(
                      onTap: () {
                        Navigator.of(context).push(
                          MaterialPageRoute(builder: (context) {
                            return const MySecondPage();
                          }),
                        );
                      },
                      title: const Text('Next page'),
                      trailing: const Icon(Icons.forward),
                    ),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Second page'),
      ),
      endDrawer: const Drawer(),
    );
  }
}