comunicmobile/lib/ui/routes/app_settings_route.dart

import 'package:comunic/helpers/preferences_helper.dart';
import 'package:comunic/utils/intl_utils.dart';
import 'package:flutter/material.dart';

/// Application settings route
///
/// @author Pierre HUBERT

class AppSettingsRoute extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(tr("App settings")),
      ),
      body: _AppSettingsBody(),
    );
  }
}

class _AppSettingsBody extends StatefulWidget {
  @override
  __AppSettingsBodyState createState() => __AppSettingsBodyState();
}

class __AppSettingsBodyState extends State<_AppSettingsBody> {
  PreferencesHelper _preferencesHelper;

  @override
  void initState() {
    super.initState();
    _load();
  }

  void _load() async {
    final prefs = await PreferencesHelper.getInstance();
    setState(() {
      _preferencesHelper = prefs;
    });
  }

  void _needRefresh() {
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    if (_preferencesHelper == null)
      return Center(child: CircularProgressIndicator());

    return Padding(
      padding: const EdgeInsets.all(8.0),
      child: ListView(
        children: <Widget>[
          // Dark theme
          _CheckBoxPreference(
            preferenceKey: PreferencesKeyList.ENABLE_DARK_THEME,
            preferencesHelper: _preferencesHelper,
            onUpdate: _needRefresh,
            title: tr("Enable dark theme"),
            description:
                tr("You will need to restart the application to apply changes"),
          ),
        ],
      ),
    );
  }
}

class _CheckBoxPreference extends StatelessWidget {
  final PreferencesKeyList preferenceKey;
  final PreferencesHelper preferencesHelper;
  final VoidCallback onUpdate;
  final String title;
  final String description;

  const _CheckBoxPreference({
    Key key,
    @required this.preferenceKey,
    @required this.preferencesHelper,
    @required this.onUpdate,
    @required this.title,
    @required this.description,
  })  : assert(preferencesHelper != null),
        assert(preferencesHelper != null),
        assert(onUpdate != null),
        assert(title != null),
        assert(description != null),
        super(key: key);

  @override
  Widget build(BuildContext context) {
    return SwitchListTile(
      value: preferencesHelper.getBool(preferenceKey),
      onChanged: (b) async {
        await preferencesHelper.setBool(preferenceKey, b);
        onUpdate();
        return true;
      },
      title: Text(title),
      subtitle: Text(description),
    );
  }
}