trifid_mobile/lib/screens/SettingsScreen.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:mobile_nebula/components/SimplePage.dart';
import 'package:mobile_nebula/components/config/ConfigItem.dart';
import 'package:mobile_nebula/components/config/ConfigPageItem.dart';
import 'package:mobile_nebula/components/config/ConfigSection.dart';
import 'package:mobile_nebula/services/settings.dart';
import 'package:mobile_nebula/services/utils.dart';

import 'AboutScreen.dart';

class SettingsScreen extends StatefulWidget {
  @override
  _SettingsScreenState createState() {
    return _SettingsScreenState();
  }
}

class _SettingsScreenState extends State<SettingsScreen> {
  var settings = Settings();

  @override
  void initState() {
    //TODO: we need to unregister on dispose?
    settings.onChange().listen((_) {
      if (this.mounted) {
        setState(() {});
      }
    });
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    List<Widget> colorSection = [];
    List<Widget> logSection = [];

    // System Color Configs
    colorSection.add(ConfigItem(
      label: Text('Use system colors'),
      labelWidth: 200,
      content: Align(
          alignment: Alignment.centerRight,
          child: Switch.adaptive(
            materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
            onChanged: (value) {
              settings.useSystemColors = value;
            },
            value: settings.useSystemColors,
          )),
    ));

    if (!settings.useSystemColors) {
      colorSection.add(ConfigItem(
        label: Text('Dark mode'),
        content: Align(
            alignment: Alignment.centerRight,
            child: Switch.adaptive(
              materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
              onChanged: (value) {
                settings.darkMode = value;
              },
              value: settings.darkMode,
            )),
      ));
    }
    // Log Configs
    logSection.add(ConfigItem(
      label: Text('Wrap log output'),
      labelWidth: 200,
      content: Align(
          alignment: Alignment.centerRight,
          child: Switch.adaptive(
            materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
            value: settings.logWrap,
            onChanged: (value) {
              setState(() {
                settings.logWrap = value;
              });
            },
          )),
    ));
    logSection.add(ConfigItem(
      label: Text('Use Local Time Zone'),
      labelWidth: 200,
      content: Align(
          alignment: Alignment.centerRight,
          child: Switch.adaptive(
            materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
            value: settings.logLocalTZ,
            onChanged: (value) {
              setState(() {
                settings.logLocalTZ = value;
              });
            },
          )),
    ));

    List<Widget> items = [];
    items.add(ConfigSection(children: colorSection));
    items.add(ConfigSection(children: logSection));
    items.add(ConfigSection(children: [
      ConfigPageItem(
        label: Text('About'),
        onPressed: () => Utils.openPage(context, (context) => AboutScreen()),
      )
    ]));

    return SimplePage(
      title: 'Settings',
      child: Column(children: items),
    );
  }
}