app-flutter/lib/pages/settings.dart

// Settings: the few things that are chosen, gathered in one place. Build-time choices
// are shown so it is clear where they come from, not edited here.

import 'package:flutter/material.dart';

import '../actions/server_url.dart';
import '../link/boundary.dart';
import '../link/net.dart';
import '../shell_scope.dart';
import '../theme/light.dart';
import '../theme/palette.dart';
import '../theme/sun.dart';

class SettingsPage extends StatelessWidget {
  const SettingsPage({
    super.key,
    required this.boundary,
    required this.usb,
    required this.themes,
  });
  final Boundary boundary;
  final UsbLink usb;
  final Themes themes;

  @override
  Widget build(BuildContext context) {
    final p = AppTheme.of(context);
    Widget section(String t) => Padding(
      padding: const EdgeInsets.fromLTRB(16, 20, 16, 4),
      child: Text(
        t,
        style: Theme.of(context).textTheme.labelLarge
            ?.copyWith(color: p.subdued),
      ),
    );
    return ListenableBuilder(
      listenable: Listenable.merge([boundary, themes]),
      builder: (context, _) => Scaffold(
        appBar: AppBar(
          leading: const MenuButton(),
          title: const Text('Settings'),
        ),
        body: ListView(
          children: [
            section('Connection'),
            ListTile(
              leading: const Icon(Icons.lan),
              title: const Text('Gateway address'),
              subtitle: Text(
                boundary.url,
                style: const TextStyle(fontFamily: 'monospace'),
              ),
              trailing: const Icon(Icons.edit),
              onTap: () => editUrl(context, boundary, usb),
            ),
            section('Display'),
            ListTile(
              leading: Icon(themes.isDark ? Icons.dark_mode : Icons.light_mode),
              title: const Text('Dark or bright'),
              subtitle: ValueListenableBuilder(
                valueListenable: themes.lux,
                builder: (context, lux, _) {
                  final sun = themes.sunElevationNow;
                  final now = lux != null
                      ? 'now ${lux.toStringAsFixed(lux < 10 ? 1 : 0)} lux; dark at '
                            '${LightSwitch.darkAt.round()} or less, bright from ${LightSwitch.brightAt.round()}'
                      : sun != null
                      ? 'now ${sun.round()}° above the horizon at the last GNSS position; '
                            'dark below ${darkBelowDeg.round()}°'
                      : 'no GNSS position yet';
                  return Text(
                    'Auto follows ${themes.autoSource} ($now). '
                    'The status bar button holds one; a long press there is auto again.',
                  );
                },
              ),
            ),
            Padding(
              padding: const EdgeInsets.fromLTRB(72, 0, 16, 8),
              child: SegmentedButton<VariantMode>(
                segments: const [
                  ButtonSegment(
                    value: VariantMode.auto,
                    icon: Icon(Icons.brightness_auto),
                    label: Text('Auto'),
                  ),
                  ButtonSegment(
                    value: VariantMode.dark,
                    icon: Icon(Icons.dark_mode),
                    label: Text('Dark'),
                  ),
                  ButtonSegment(
                    value: VariantMode.bright,
                    icon: Icon(Icons.light_mode),
                    label: Text('Bright'),
                  ),
                ],
                selected: {themes.mode},
                showSelectedIcon: false,
                onSelectionChanged: (s) => themes.mode = s.single,
              ),
            ),
            ListTile(
              leading: const Icon(Icons.palette),
              title: const Text('Theme'),
              subtitle: Text(
                '${themes.name} · set at build time: --dart-define=YUKART_THEME=<name>',
              ),
            ),
            ListTile(
              leading: const Icon(Icons.home),
              title: const Text('Landing view'),
              subtitle: Text(
                '${landingView.name} · set at build time: --dart-define=YUKART_HOME=dash|signals',
              ),
            ),
          ],
        ),
      ),
    );
  }
}