meals/lib/screens/filters.dart

import 'package:flutter/material.dart';
import 'package:meals/screens/tabs.dart';
import 'package:meals/widgets/main_drawer.dart';

enum Filter {
  glutenFree,
  lactoseFree,
  veggie,
  vegan,
}

class FiltersScreen extends StatefulWidget {
  final Map<Filter, bool> currentFilters;

  const FiltersScreen({Key? key, required this.currentFilters})
      : super(key: key);

  @override
  State<FiltersScreen> createState() => _FiltersScreenState();
}

class _FiltersScreenState extends State<FiltersScreen> {
  bool _glutenFreeFilterSet = false;
  bool _lactoseFreeFilterSet = false;
  bool _veggieFilterSet = false;
  bool _veganFilterSet = false;

  @override
  void initState() {
    super.initState();
    setState(() {
      _glutenFreeFilterSet = widget.currentFilters[Filter.glutenFree]!;
      _lactoseFreeFilterSet = widget.currentFilters[Filter.lactoseFree]!;
      _veggieFilterSet = widget.currentFilters[Filter.veggie]!;
      _veganFilterSet = widget.currentFilters[Filter.vegan]!;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: const Text('Your filters'),
        ),
        body: WillPopScope(
          onWillPop: () async {
            Navigator.of(context).pop({
              Filter.glutenFree: _glutenFreeFilterSet,
              Filter.lactoseFree: _lactoseFreeFilterSet,
              Filter.veggie: _veggieFilterSet,
              Filter.vegan: _veganFilterSet,
            });

            return false;
          },
          child: Column(
            children: [
              SwitchListTile(
                value: _glutenFreeFilterSet,
                onChanged: (checked) => setState(() {
                  _glutenFreeFilterSet = checked;
                }),
                title: Text(
                  'Gluten free',
                  style: Theme.of(context).textTheme.titleLarge!.copyWith(
                      color: Theme.of(context).colorScheme.onBackground),
                ),
                subtitle: Text(
                  'Only includes gluten-free meals',
                  style: Theme.of(context).textTheme.labelMedium!.copyWith(
                      color: Theme.of(context).colorScheme.onBackground),
                ),
                activeColor: Theme.of(context).colorScheme.tertiary,
                contentPadding: const EdgeInsets.only(left: 34, right: 22),
              ),
              SwitchListTile(
                value: _lactoseFreeFilterSet,
                onChanged: (checked) => setState(() {
                  _lactoseFreeFilterSet = checked;
                }),
                title: Text(
                  'Lactose free',
                  style: Theme.of(context).textTheme.titleLarge!.copyWith(
                      color: Theme.of(context).colorScheme.onBackground),
                ),
                subtitle: Text(
                  'Only includes lactose-free meals',
                  style: Theme.of(context).textTheme.labelMedium!.copyWith(
                      color: Theme.of(context).colorScheme.onBackground),
                ),
                activeColor: Theme.of(context).colorScheme.tertiary,
                contentPadding: const EdgeInsets.only(left: 34, right: 22),
              ),
              SwitchListTile(
                value: _veggieFilterSet,
                onChanged: (checked) => setState(() {
                  _veggieFilterSet = checked;
                }),
                title: Text(
                  'Veggie',
                  style: Theme.of(context).textTheme.titleLarge!.copyWith(
                      color: Theme.of(context).colorScheme.onBackground),
                ),
                subtitle: Text(
                  'Only includes veggie meals',
                  style: Theme.of(context).textTheme.labelMedium!.copyWith(
                      color: Theme.of(context).colorScheme.onBackground),
                ),
                activeColor: Theme.of(context).colorScheme.tertiary,
                contentPadding: const EdgeInsets.only(left: 34, right: 22),
              ),
              SwitchListTile(
                value: _veganFilterSet,
                onChanged: (checked) => setState(() {
                  _veganFilterSet = checked;
                }),
                title: Text(
                  'Vegan',
                  style: Theme.of(context).textTheme.titleLarge!.copyWith(
                      color: Theme.of(context).colorScheme.onBackground),
                ),
                subtitle: Text(
                  'Only includes vegan meals',
                  style: Theme.of(context).textTheme.labelMedium!.copyWith(
                      color: Theme.of(context).colorScheme.onBackground),
                ),
                activeColor: Theme.of(context).colorScheme.tertiary,
                contentPadding: const EdgeInsets.only(left: 34, right: 22),
              )
            ],
          ),
        ));
  }
}