flutter_meal final

lib/models/meal.dart

@@ -40,4 +40,4 @@ class Meal {
   final bool isLactoseFree;
   final bool isVegan;
   final bool isVegetarian;
-}
+}

lib/screens/categories.dart

@@ -10,12 +10,14 @@ class CategoriesScreen extends StatelessWidget {
   const CategoriesScreen({
     super.key,
     required this.onToggleFavorites,
+    required this.availableMeals,
   });
 
   final void Function(Meal meal) onToggleFavorites;
+  final List<Meal> availableMeals;
 
   void _selectCategory(BuildContext context, Category category) {
-    final filteredMeals = dummyMeals
+    final filteredMeals = availableMeals
         .where((meal) => meal.categories.contains(category.id))
         .toList();
 

lib/screens/filters.dart

@@ -3,11 +3,21 @@ import 'package:flutter/material.dart';
 // import 'package:flutter_navigation/screens/tabs.dart';
 // import 'package:flutter_navigation/widgets/main_drawer.dart';
 
+enum Filter {
+  glutenFree,
+  lactoseFree,
+  vegetarien,
+  vegan,
+}
+
 class FiltersScreen extends StatefulWidget {
   const FiltersScreen({
     super.key,
+    required this.currentFilters,
   });
 
+  final Map<Filter, bool> currentFilters;
+
   @override
   State<StatefulWidget> createState() {
     return _FiltersScreenState();
@@ -20,6 +30,16 @@ class _FiltersScreenState extends State<FiltersScreen> {
   var _vegetarianFilterSet = false;
   var _veganFilterSet = false;
 
+  @override
+  void initState() {
+    super.initState();
+
+    _glutenFilterSet = widget.currentFilters[Filter.glutenFree]!;
+    _lactoseFilterSet = widget.currentFilters[Filter.lactoseFree]!;
+    _vegetarianFilterSet = widget.currentFilters[Filter.vegetarien]!;
+    _veganFilterSet = widget.currentFilters[Filter.vegan]!;
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -38,96 +58,107 @@ class _FiltersScreenState extends State<FiltersScreen> {
       //     }
       //   },
       // ),
-      body: Column(children: [
+      body: WillPopScope(
-        SwitchListTile(
+        onWillPop: () async {
-          value: _glutenFilterSet,
+          Navigator.of(context).pop({
-          onChanged: (isChecked) {
+            Filter.glutenFree: _glutenFilterSet,
-            setState(() {
+            Filter.lactoseFree: _lactoseFilterSet,
-              _glutenFilterSet = isChecked;
+            Filter.vegetarien: _vegetarianFilterSet,
-            });
+            Filter.vegan: _veganFilterSet,
-          },
+          });
-          title: Text(
+          return false;
-            'Gluten-free',
+        },
-            style: Theme.of(context).textTheme.titleLarge!.copyWith(
+        child: Column(children: [
-                  color: Theme.of(context).colorScheme.onBackground,
+          SwitchListTile(
-                ),
+            value: _glutenFilterSet,
+            onChanged: (isChecked) {
+              setState(() {
+                _glutenFilterSet = isChecked;
+              });
+            },
+            title: Text(
+              'Gluten-free',
+              style: Theme.of(context).textTheme.titleLarge!.copyWith(
+                    color: Theme.of(context).colorScheme.onBackground,
+                  ),
+            ),
+            subtitle: Text(
+              'Only include 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),
           ),
-          subtitle: Text(
+          SwitchListTile(
-            'Only include gluten-free meals.',
+            value: _lactoseFilterSet,
-            style: Theme.of(context).textTheme.labelMedium!.copyWith(
+            onChanged: (isChecked) {
-                  color: Theme.of(context).colorScheme.onBackground,
+              setState(() {
-                ),
+                _lactoseFilterSet = isChecked;
+              });
+            },
+            title: Text(
+              'Lactose-free',
+              style: Theme.of(context).textTheme.titleLarge!.copyWith(
+                    color: Theme.of(context).colorScheme.onBackground,
+                  ),
+            ),
+            subtitle: Text(
+              'Only include 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),
           ),
-          activeColor: Theme.of(context).colorScheme.tertiary,
+          SwitchListTile(
-          contentPadding: const EdgeInsets.only(left: 34, right: 22),
+            value: _vegetarianFilterSet,
-        ),
+            onChanged: (isChecked) {
-        SwitchListTile(
+              setState(() {
-          value: _lactoseFilterSet,
+                _vegetarianFilterSet = isChecked;
-          onChanged: (isChecked) {
+              });
-            setState(() {
+            },
-              _lactoseFilterSet = isChecked;
+            title: Text(
-            });
+              'Vegetarian',
-          },
+              style: Theme.of(context).textTheme.titleLarge!.copyWith(
-          title: Text(
+                    color: Theme.of(context).colorScheme.onBackground,
-            'Lactose-free',
+                  ),
-            style: Theme.of(context).textTheme.titleLarge!.copyWith(
+            ),
-                  color: Theme.of(context).colorScheme.onBackground,
+            subtitle: Text(
-                ),
+              'Only include vegetarian 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),
           ),
-          subtitle: Text(
+          SwitchListTile(
-            'Only include lactose-free meals.',
+            value: _veganFilterSet,
-            style: Theme.of(context).textTheme.labelMedium!.copyWith(
+            onChanged: (isChecked) {
-                  color: Theme.of(context).colorScheme.onBackground,
+              setState(() {
-                ),
+                _veganFilterSet = isChecked;
+              });
+            },
+            title: Text(
+              'Vegan',
+              style: Theme.of(context).textTheme.titleLarge!.copyWith(
+                    color: Theme.of(context).colorScheme.onBackground,
+                  ),
+            ),
+            subtitle: Text(
+              'Only include 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),
           ),
-          activeColor: Theme.of(context).colorScheme.tertiary,
+        ]),
-          contentPadding: const EdgeInsets.only(left: 34, right: 22),
+      ),
-        ),
-        SwitchListTile(
-          value: _vegetarianFilterSet,
-          onChanged: (isChecked) {
-            setState(() {
-              _vegetarianFilterSet = isChecked;
-            });
-          },
-          title: Text(
-            'Vegetarian',
-            style: Theme.of(context).textTheme.titleLarge!.copyWith(
-                  color: Theme.of(context).colorScheme.onBackground,
-                ),
-          ),
-          subtitle: Text(
-            'Only include vegetarian 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: (isChecked) {
-            setState(() {
-              _veganFilterSet = isChecked;
-            });
-          },
-          title: Text(
-            'Vegan',
-            style: Theme.of(context).textTheme.titleLarge!.copyWith(
-                  color: Theme.of(context).colorScheme.onBackground,
-                ),
-          ),
-          subtitle: Text(
-            'Only include 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),
-        ),
-      ]),
     );
   }
 }

lib/screens/tabs.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_navigation/data/dummy_data.dart';
 import 'package:flutter_navigation/screens/categories.dart';
 import 'package:flutter_navigation/screens/meals.dart';
 import 'package:flutter_navigation/widgets/main_drawer.dart';
@@ -6,6 +7,13 @@ import 'package:flutter_navigation/widgets/main_drawer.dart';
 import '../models/meal.dart';
 import 'filters.dart';
 
+const kInitialFilters = {
+  Filter.glutenFree: false,
+  Filter.lactoseFree: false,
+  Filter.vegetarien: false,
+  Filter.vegan: false,
+};
+
 class TabsScreen extends StatefulWidget {
   const TabsScreen({super.key});
 
@@ -18,6 +26,7 @@ class TabsScreen extends StatefulWidget {
 class _TabsScreenState extends State<TabsScreen> {
   int _selectedPageIndex = 0;
   final List<Meal> _favoriteMeals = [];
+  Map<Filter, bool> _selectedFilters = kInitialFilters;
 
   void _showInfoMessage(String message) {
     ScaffoldMessenger.of(context).clearSnackBars();
@@ -46,21 +55,48 @@ class _TabsScreenState extends State<TabsScreen> {
     });
   }
 
-  void _setScreen(String identifier) {
+  void _setScreen(String identifier) async {
     Navigator.of(context).pop();
     if (identifier == 'filters') {
-      Navigator.of(context).push(
+      final result = await Navigator.of(context).push<Map<Filter, bool>>(
         MaterialPageRoute(
-          builder: (ctx) => const FiltersScreen(),
+          builder: (ctx) => FiltersScreen(
+            currentFilters: _selectedFilters,
+          ),
         ),
       );
+
+      setState(() {
+        _selectedFilters = result ?? kInitialFilters;
+      });
     }
   }
 
   @override
   Widget build(BuildContext context) {
+    final availableMeals = dummyMeals.where((meal) {
+      if (_selectedFilters[Filter.glutenFree]! && !meal.isGlutenFree) {
+        return false;
+      }
+
+      if (_selectedFilters[Filter.lactoseFree]! && !meal.isLactoseFree) {
+        return false;
+      }
+
+      if (_selectedFilters[Filter.vegetarien]! && !meal.isVegetarian) {
+        return false;
+      }
+
+      if (_selectedFilters[Filter.vegan]! && !meal.isVegan) {
+        return false;
+      }
+
+      return true;
+    }).toList();
+
     Widget activePage = CategoriesScreen(
       onToggleFavorites: _toggleMealFavoriteStatus,
+      availableMeals: availableMeals,
     );
     var activePageTitle = 'Categories';
 

lib/widgets/category_grid_item.dart

@@ -34,8 +34,8 @@ class CategoryGridItem extends StatelessWidget {
         child: Text(
           category.title,
           style: Theme.of(context).textTheme.titleLarge!.copyWith(
-            color: Theme.of(context).colorScheme.onBackground,
+                color: Theme.of(context).colorScheme.onBackground,
-          ),
+              ),
         ),
       ),
     );

lib/widgets/main_drawer.dart

@@ -1,7 +1,10 @@
 import 'package:flutter/material.dart';
 
 class MainDrawer extends StatelessWidget {
-  const MainDrawer({ super.key, required this .onSelectScreen,});
+  const MainDrawer({
+    super.key,
+    required this.onSelectScreen,
+  });
 
   final void Function(String identifier) onSelectScreen;
 
@@ -15,12 +18,8 @@ class MainDrawer extends StatelessWidget {
             decoration: BoxDecoration(
               gradient: LinearGradient(
                 colors: [
-                  Theme
+                  Theme.of(context).colorScheme.primaryContainer,
-                      .of(context)
+                  Theme.of(context)
-                      .colorScheme
-                      .primaryContainer,
-                  Theme
-                      .of(context)
                       .colorScheme
                       .primaryContainer
                       .withOpacity(0.8),
@@ -34,24 +33,14 @@ class MainDrawer extends StatelessWidget {
                 Icon(
                   Icons.fastfood,
                   size: 48,
-                  color: Theme
+                  color: Theme.of(context).colorScheme.primary,
-                      .of(context)
-                      .colorScheme
-                      .primary,
                 ),
                 const SizedBox(width: 18),
                 Text(
                   'Cooking Up!',
-                  style: Theme
+                  style: Theme.of(context).textTheme.titleLarge!.copyWith(
-                      .of(context)
+                        color: Theme.of(context).colorScheme.primary,
-                      .textTheme
+                      ),
-                      .titleLarge!
-                      .copyWith(
-                    color: Theme
-                        .of(context)
-                        .colorScheme
-                        .primary,
-                  ),
                 )
               ],
             ),
@@ -60,24 +49,14 @@ class MainDrawer extends StatelessWidget {
             leading: Icon(
               Icons.restaurant,
               size: 26,
-              color: Theme
+              color: Theme.of(context).colorScheme.onBackground,
-                  .of(context)
-                  .colorScheme
-                  .onBackground,
             ),
             title: Text(
               'Meals',
-              style: Theme
+              style: Theme.of(context).textTheme.titleSmall!.copyWith(
-                  .of(context)
+                    color: Theme.of(context).colorScheme.onBackground,
-                  .textTheme
+                    fontSize: 24,
-                  .titleSmall!
+                  ),
-                  .copyWith(
-                color: Theme
-                    .of(context)
-                    .colorScheme
-                    .onBackground,
-                fontSize: 24,
-              ),
             ),
             onTap: () {
               onSelectScreen('meals');
@@ -87,24 +66,14 @@ class MainDrawer extends StatelessWidget {
             leading: Icon(
               Icons.settings,
               size: 26,
-              color: Theme
+              color: Theme.of(context).colorScheme.onBackground,
-                  .of(context)
-                  .colorScheme
-                  .onBackground,
             ),
             title: Text(
               'Filters',
-              style: Theme
+              style: Theme.of(context).textTheme.titleSmall!.copyWith(
-                  .of(context)
+                    color: Theme.of(context).colorScheme.onBackground,
-                  .textTheme
+                    fontSize: 24,
-                  .titleSmall!
+                  ),
-                  .copyWith(
-                color: Theme
-                    .of(context)
-                    .colorScheme
-                    .onBackground,
-                fontSize: 24,
-              ),
             ),
             onTap: () {
               onSelectScreen('filters');