feat(): toggle favorite meals

lib/main.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:google_fonts/google_fonts.dart';
 import 'package:meals/screens/CategoriesScreen.dart';
+import 'package:meals/screens/tabs.dart';
 
 final theme = ThemeData(
   useMaterial3: true,
@@ -22,7 +23,7 @@ class App extends StatelessWidget {
   Widget build(BuildContext context) {
     return MaterialApp(
       theme: theme,
-      home: const CategoriesScreen(),
+      home: const TabsScreen(),
     );
   }
 }

lib/screens/CategoriesScreen.dart

@@ -6,7 +6,9 @@ import 'package:meals/screens/MealsScreen.dart';
 import 'package:meals/widgets/CategoryGridItem.dart';
 
 class CategoriesScreen extends StatelessWidget {
-  const CategoriesScreen({super.key});
+  final void Function(Meal meal) onToggleFavorite;
+
+  const CategoriesScreen({super.key, required this.onToggleFavorite});
 
   void _selectCategory(BuildContext context, Category category) {
     final meals = dummyMeals
@@ -17,34 +19,31 @@ class CategoriesScreen extends StatelessWidget {
         context,
         MaterialPageRoute(
             builder: (ctx) =>
-                MealsScreen(title: category.title, meals: meals)));
+                MealsScreen(title: category.title,
+                  meals: meals,
+                  onToggleFavorite: onToggleFavorite,)));
   }
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('Pick your category'),
-      ),
-      body: GridView(
-          padding: const EdgeInsets.all(24),
-          gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
-            crossAxisCount: 2,
-            childAspectRatio: 1.5,
-            crossAxisSpacing: 20,
-            mainAxisSpacing: 20,
-          ),
-          children: [
-            for (final category in availableCategories)
-              CategoryGridItem(
-                  category: category,
-                  onClickCallback: () {
-                    _selectCategory(
-                      context,
-                      category,
-                    );
-                  })
-          ]),
-    );
+    return GridView(
+        padding: const EdgeInsets.all(24),
+        gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+          crossAxisCount: 2,
+          childAspectRatio: 1.5,
+          crossAxisSpacing: 20,
+          mainAxisSpacing: 20,
+        ),
+        children: [
+          for (final category in availableCategories)
+            CategoryGridItem(
+                category: category,
+                onClickCallback: () {
+                  _selectCategory(
+                    context,
+                    category,
+                  );
+                })
+        ]);
   }
 }

lib/screens/MealsScreen.dart

@@ -1,12 +1,29 @@
 import 'package:flutter/material.dart';
 import 'package:meals/models/Meal.dart';
+import 'package:meals/screens/meal_details.dart';
 import 'package:meals/widgets/MealItem.dart';
 
 class MealsScreen extends StatelessWidget {
-  final String title;
+  final String? title;
   final List<Meal> meals;
+  final void Function(Meal meal) onToggleFavorite;
 
-  const MealsScreen({super.key, required this.title, required this.meals});
+  const MealsScreen(
+      {super.key,
+      this.title,
+      required this.meals,
+      required this.onToggleFavorite});
+
+  void _selectMeal(BuildContext buildContext, Meal meal) {
+    Navigator.push(
+        buildContext,
+        MaterialPageRoute(
+          builder: (ctx) => MealDetailScreen(
+            meal: meal,
+            onToggleFavorite: onToggleFavorite,
+          ),
+        ));
+  }
 
   @override
   Widget build(BuildContext context) {
@@ -34,16 +51,23 @@ class MealsScreen extends StatelessWidget {
           )
         : ListView.builder(
             itemBuilder: (BuildContext context, int index) {
-              return MealItem(meal: meals[index]);
+              return MealItem(
+                meal: meals[index],
+                callbackClickOnMeal: (meal) {
+                  _selectMeal(context, meal);
+                },
+              );
             },
             itemCount: meals.length,
           );
 
-    return Scaffold(
-      appBar: AppBar(
-        title: Text(title),
-      ),
-      body: content,
-    );
+    return title == null
+        ? content
+        : Scaffold(
+            appBar: AppBar(
+              title: Text(title!),
+            ),
+            body: content,
+          );
   }
 }

lib/screens/meal_details.dart

@@ -0,0 +1,80 @@
+import 'package:flutter/material.dart';
+
+import '../models/Meal.dart';
+
+class MealDetailScreen extends StatelessWidget {
+  final Meal meal;
+  final void Function(Meal meal) onToggleFavorite;
+
+  const MealDetailScreen(
+      {Key? key, required this.meal, required this.onToggleFavorite})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+        appBar: AppBar(
+          title: Text(meal.title),
+          actions: [
+            IconButton(
+                onPressed: () => onToggleFavorite(meal),
+                icon: const Icon(Icons.star))
+          ],
+        ),
+        body: SingleChildScrollView(
+          child: Column(
+            children: [
+              Image.network(
+                meal.imageUrl,
+                width: double.infinity,
+                height: 300,
+                fit: BoxFit.cover,
+              ),
+              const SizedBox(
+                height: 14,
+              ),
+              Text(
+                'Ingredients',
+                style: Theme.of(context).textTheme.titleLarge!.copyWith(
+                      color: Theme.of(context).colorScheme.primary,
+                      fontWeight: FontWeight.bold,
+                    ),
+              ),
+              const SizedBox(
+                height: 14,
+              ),
+              for (final ingredient in meal.ingredients)
+                Text(
+                  ingredient,
+                  style: Theme.of(context).textTheme.bodyMedium!.copyWith(
+                      color: Theme.of(context).colorScheme.onBackground),
+                ),
+              const SizedBox(
+                height: 14,
+              ),
+              Text(
+                'Steps',
+                style: Theme.of(context).textTheme.titleLarge!.copyWith(
+                      color: Theme.of(context).colorScheme.primary,
+                      fontWeight: FontWeight.bold,
+                    ),
+              ),
+              const SizedBox(
+                height: 14,
+              ),
+              for (final step in meal.steps)
+                Padding(
+                  padding:
+                      const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
+                  child: Text(
+                    step,
+                    textAlign: TextAlign.center,
+                    style: Theme.of(context).textTheme.bodyMedium!.copyWith(
+                        color: Theme.of(context).colorScheme.onBackground),
+                  ),
+                ),
+            ],
+          ),
+        ));
+  }
+}

lib/screens/tabs.dart

@@ -0,0 +1,70 @@
+import 'package:flutter/material.dart';
+import 'package:meals/screens/CategoriesScreen.dart';
+import 'package:meals/screens/MealsScreen.dart';
+
+import '../models/Meal.dart';
+
+class TabsScreen extends StatefulWidget {
+  const TabsScreen({Key? key}) : super(key: key);
+
+  @override
+  State<TabsScreen> createState() => _TabsScreenState();
+}
+
+class _TabsScreenState extends State<TabsScreen> {
+  int _selectedPageIndex = 0;
+  final List<Meal> _favoriteMeals = [];
+
+  void _selectPage(int index) {
+    setState(() {
+      _selectedPageIndex = index;
+    });
+  }
+
+  void _toggleFavoriteMeal(Meal meal) {
+    if (_favoriteMeals.contains(meal)) {
+      setState(() {
+        _favoriteMeals.remove(meal);
+      });
+    } else {
+      setState(() {
+        _favoriteMeals.add(meal);
+      });
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    Widget activePage;
+    String? activePageTitle;
+
+    switch (_selectedPageIndex) {
+      case 1:
+        activePageTitle = 'Favorites';
+        activePage = MealsScreen(
+          meals: _favoriteMeals,
+          onToggleFavorite: _toggleFavoriteMeal,
+        );
+        break;
+      default:
+        activePageTitle = 'Pick your category';
+        activePage = CategoriesScreen(
+          onToggleFavorite: _toggleFavoriteMeal,
+        );
+    }
+
+    return Scaffold(
+      appBar: AppBar(title: Text(activePageTitle)),
+      body: activePage,
+      bottomNavigationBar: BottomNavigationBar(
+        onTap: _selectPage,
+        currentIndex: _selectedPageIndex,
+        items: const [
+          BottomNavigationBarItem(
+              icon: Icon(Icons.set_meal), label: 'Categories'),
+          BottomNavigationBarItem(icon: Icon(Icons.star), label: 'Favorites'),
+        ],
+      ),
+    );
+  }
+}

lib/widgets/MealItem.dart

@@ -1,11 +1,14 @@
 import 'package:flutter/material.dart';
 import 'package:meals/models/Meal.dart';
+import 'package:meals/screens/meal_details.dart';
 import 'package:meals/widgets/meal_item%20treat.dart';
 import 'package:transparent_image/transparent_image.dart';
 
 class MealItem extends StatelessWidget {
   final Meal meal;
-  const MealItem({Key? key, required this.meal}) : super(key: key);
+  final void Function(Meal meal) callbackClickOnMeal;
+
+  const MealItem({Key? key, required this.meal, required this.callbackClickOnMeal}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -15,7 +18,7 @@ class MealItem extends StatelessWidget {
       clipBehavior: Clip.hardEdge,
       elevation: 2,
       child: InkWell(
-        onTap: () {},
+        onTap: () => callbackClickOnMeal(meal),
         child: Stack(
           children: [
             FadeInImage(