import 'package:flutter/material.dart';

class MediumSizedContainer extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => MediumSizedContainerState();
}

class MediumSizedContainerState extends State<StatefulWidget> {
  int _selectedIndex = 0;

  @override
  Widget build(BuildContext context) {
    return NavigationRail(
        selectedIndex: 0,
        destinations: getDestinations<NavigationRailDestination>(
            (selectedIcon, regularIcon, label) => NavigationRailDestination(
                selectedIcon: selectedIcon,
                icon: regularIcon,
                label: Text(label))),
                extended: true,);
  }
}

typedef ItemCreator<T> = T Function(Icon selectedIcon, Icon icon, String label);

List<T> getDestinations<T>(ItemCreator<T> creator) {
  T overview = creator(
      const Icon(Icons.timer), const Icon(Icons.timer_outlined), 'Timers');

  T triggers = creator(const Icon(Icons.alarm_add),
      const Icon(Icons.alarm_add_outlined), 'Triggers');

  T logs = creator(const Icon(Icons.assignment),
      const Icon(Icons.assignment_outlined), 'Logs');

  T settings = creator(const Icon(Icons.settings),
      const Icon(Icons.settings_outlined), 'Settings');

  return [overview, triggers, logs, settings];
}