Flutter Jour Cinq Part 2

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Post #102

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Flutter Jour Cinq Part 2

Tuesday, 25 August 2020 15:09:02 by Khodok

5 min read

Flutter Jour Cinq (Part 2) Part 1

DeliMeals

  • 11:15 - 12:15 : Ajout des tabs
Code jusque là (1)
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import 'package:delimeals/screens/category_meals_screen.dart';
import 'package:delimeals/screens/meal_detail_screen.dart';
import 'package:delimeals/screens/tabs_screen.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'DeliMeals',
      theme: ThemeData(
        primarySwatch: Colors.pink,
        accentColor: Colors.amber,
        canvasColor: Color.fromRGBO(255, 254, 229, 1),
        fontFamily: 'Raleway',
        textTheme: TextTheme(
          headline6: TextStyle(
            fontWeight: FontWeight.bold,
          ),
        ),
      ),
      routes: {
        '/': (context) => TabsScreen(),
        CategoryMealsScreen.routeName: (context) => CategoryMealsScreen(),
        MealDetailScreen.routeName: (context) => MealDetailScreen(),
      },
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('DeliMeals'),
      ),
      body: Center(
        child: Text('Navigation Time!'),
      ),
    );
  }
}
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import 'package:delimeals/dummy_data.dart';
import 'package:delimeals/widgets/category_item.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';

class CategoriesScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return GridView(
      padding: const EdgeInsets.all(25),
      children: DUMMY_CATEGORIES
          .map(
            (catData) => CategoryItem(
              catData.id,
              catData.title,
              catData.color,
            ),
          )
          .toList(),
      gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
        maxCrossAxisExtent: 200,
        childAspectRatio: 3 / 2,
        crossAxisSpacing: 20,
        mainAxisSpacing: 20,
      ),
    );
  }
}
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import 'package:flutter/material.dart';

import 'categories_screen.dart';
import 'favorites_screen.dart';

class TabsScreen extends StatefulWidget {
  @override
  _TabsScreenState createState() => _TabsScreenState();
}

class _TabsScreenState extends State<TabsScreen> {
  final List<Map<String, Object>> _pages = [
    {'page': CategoriesScreen(), 'title': 'Categories'},
    {'page': FavoritesScreen(), 'title': 'Your Favorites'},
  ];

  int _selectedPageIndex = 0;

  void _selectPage(int index) {
    setState(() {
      _selectedPageIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_pages[_selectedPageIndex]['title']),
      ),
      body: _pages[_selectedPageIndex]['page'],
      bottomNavigationBar: BottomNavigationBar(
        onTap: _selectPage,
        backgroundColor: Theme.of(context).primaryColor,
        unselectedItemColor: Colors.white,
        selectedItemColor: Theme.of(context).accentColor,
        currentIndex: _selectedPageIndex,
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.category),
            title: Text('Categories'),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.star),
            title: Text('Favorites'),
          ),
        ],
      ),
    );
  }
}
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import 'package:flutter/material.dart';

class FavoritesScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Favorites'),
    );
  }
}
  • 13:00 - 15:00 : Drawers

Code jusqu’ici (2)

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import 'package:delimeals/screens/category_meals_screen.dart';
import 'package:delimeals/screens/meal_detail_screen.dart';
import 'package:delimeals/screens/tabs_screen.dart';
import 'package:delimeals/widgets/filters_screen.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'DeliMeals',
      theme: ThemeData(
        primarySwatch: Colors.pink,
        accentColor: Colors.amber,
        canvasColor: Color.fromRGBO(255, 254, 229, 1),
        fontFamily: 'Raleway',
        textTheme: TextTheme(
          headline6: TextStyle(
            fontWeight: FontWeight.bold,
          ),
        ),
      ),
      routes: {
        '/': (context) => TabsScreen(),
        CategoryMealsScreen.routeName: (context) => CategoryMealsScreen(),
        MealDetailScreen.routeName: (context) => MealDetailScreen(),
        FiltersScreen.routeName: (context) => FiltersScreen(),
      },
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('DeliMeals'),
      ),
      body: Center(
        child: Text('Navigation Time!'),
      ),
    );
  }
}
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import 'package:delimeals/dummy_data.dart';
import 'package:flutter/material.dart';

class MealDetailScreen extends StatelessWidget {
  static const routeName = '/meal-detail';

  Widget buildSectionTitle(BuildContext context, String text) {
    return Container(
      margin: EdgeInsets.symmetric(vertical: 10),
      child: Text(
        text,
        style: Theme.of(context).textTheme.headline6,
      ),
    );
  }

  Widget buildContainer({Widget child}) {
    return Container(
      decoration: BoxDecoration(
        color: Colors.white,
        border: Border.all(color: Colors.grey),
        borderRadius: BorderRadius.circular(10),
      ),
      padding: EdgeInsets.all(10),
      margin: EdgeInsets.all(10),
      height: 150,
      width: 300,
      child: child,
    );
  }

  @override
  Widget build(BuildContext context) {
    final mealId = ModalRoute.of(context).settings.arguments as String;
    final selectedMeal = DUMMY_MEALS.firstWhere((meal) => meal.id == mealId);

    return Scaffold(
      floatingActionButton: FloatingActionButton(
        child: Icon(
          Icons.delete,
        ),
        onPressed: () {
          Navigator.of(context).pop(mealId);
        },
      ),
      appBar: AppBar(
        title: Text('${selectedMeal.title}'),
      ),
      body: SingleChildScrollView(
        child: Column(
          children: <Widget>[
            Container(
              height: 300,
              width: double.infinity,
              child: Image.network(
                selectedMeal.imageUrl,
                fit: BoxFit.cover,
              ),
            ),
            buildSectionTitle(context, 'Ingredients'),
            buildContainer(
              child: ListView.builder(
                itemBuilder: (context, index) => Card(
                  color: Theme.of(context).accentColor,
                  child: Padding(
                    padding: const EdgeInsets.symmetric(
                      vertical: 5,
                      horizontal: 10,
                    ),
                    child: Text(selectedMeal.ingredients[index]),
                  ),
                ),
                itemCount: selectedMeal.ingredients.length,
              ),
            ),
            buildSectionTitle(context, 'Steps'),
            buildContainer(
              child: ListView.builder(
                itemBuilder: (context, index) => Column(
                  children: <Widget>[
                    ListTile(
                      leading: CircleAvatar(
                        child: Text('# ${(index + 1)}'),
                      ),
                      title: Text(
                        selectedMeal.steps[index],
                      ),
                    ),
                    Divider(),
                  ],
                ),
                itemCount: selectedMeal.steps.length,
              ),
            ),
          ],
        ),
      ),
    );
  }
}
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import 'package:delimeals/dummy_data.dart';
import 'package:delimeals/models/meal.dart';
import 'package:delimeals/widgets/meal_item.dart';
import 'package:flutter/material.dart';

class CategoryMealsScreen extends StatefulWidget {
  static const routeName = '/category-meals';

  @override
  _CategoryMealsScreenState createState() => _CategoryMealsScreenState();
}

class _CategoryMealsScreenState extends State<CategoryMealsScreen> {
  String categoryTitle;
  List<Meal> displayedMeals;
  var _loadedInitData = false;

  @override
  void initState() {
    super.initState();
  }

  @override
  void didChangeDependencies() {
    if (!_loadedInitData) {
      final routeArgs =
          ModalRoute.of(context).settings.arguments as Map<String, String>;
      final categoryId = routeArgs['id'];

      categoryTitle = routeArgs['title'];
      displayedMeals = DUMMY_MEALS.where((meal) {
        return meal.categories.contains(categoryId);
      }).toList();

      _loadedInitData = true;
    }

    super.didChangeDependencies();
  }

  void _removeMeal(String mealId) {
    setState(() {
      displayedMeals.removeWhere((meal) => meal.id == mealId);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(
          categoryTitle,
        ),
      ),
      body: ListView.builder(
        itemBuilder: (context, index) {
          return MealItem(
            id: displayedMeals[index].id,
            title: displayedMeals[index].title,
            imageUrl: displayedMeals[index].imageUrl,
            duration: displayedMeals[index].duration,
            complexity: displayedMeals[index].complexity,
            affordability: displayedMeals[index].affordability,
            removeItem: _removeMeal,
          );
        },
        itemCount: displayedMeals.length,
      ),
    );
  }
}
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import 'package:delimeals/widgets/main_drawer.dart';
import 'package:flutter/material.dart';

class FiltersScreen extends StatelessWidget {
  static const routeName = '/filters';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      drawer: MainDrawer(),
      appBar: AppBar(
        title: Text('Your Filters'),
      ),
      body: Center(
        child: Text('Filters'),
      ),
    );
  }
}
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import 'package:delimeals/widgets/filters_screen.dart';
import 'package:flutter/material.dart';

class MainDrawer extends StatelessWidget {
  Widget buildListTile(String title, IconData icon, Function tapHandler) {
    return ListTile(
      leading: Icon(
        icon,
        size: 26,
      ),
      title: Text(
        title,
        style: TextStyle(
          fontFamily: 'RobotoCondensed',
          fontSize: 24,
          fontWeight: FontWeight.bold,
        ),
      ),
      onTap: tapHandler,
    );
  }

  @override
  Widget build(BuildContext context) {
    return Drawer(
      child: Column(
        children: [
          Container(
            height: 120,
            width: double.infinity,
            padding: EdgeInsets.all(20),
            alignment: Alignment.centerLeft,
            color: Theme.of(context).accentColor,
            child: Text(
              'Cooking Up !',
              style: TextStyle(
                fontWeight: FontWeight.w900,
                fontSize: 30,
                color: Theme.of(context).primaryColor,
              ),
            ),
          ),
          SizedBox(
            height: 20,
          ),
          buildListTile('Meals', Icons.restaurant, () {
            Navigator.of(context).pushReplacementNamed('/');
          }),
          buildListTile('Filters', Icons.settings, () {
            Navigator.of(context).pushReplacementNamed(FiltersScreen.routeName);
          }),
        ],
      ),
    );
  }
}
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import 'package:delimeals/models/meal.dart';
import 'package:delimeals/screens/meal_detail_screen.dart';
import 'package:flutter/material.dart';

class MealItem extends StatelessWidget {
  final String id;
  final String title;
  final String imageUrl;
  final int duration;
  final Complexity complexity;
  final Affordability affordability;
  final Function removeItem;

  MealItem({
    @required this.id,
    @required this.title,
    @required this.imageUrl,
    @required this.duration,
    @required this.complexity,
    @required this.affordability,
    @required this.removeItem,
  });

  String get complexityText {
    switch (complexity) {
      case Complexity.Simple:
        return 'Simple';
        break;
      case Complexity.Challenging:
        return 'Challenging';
        break;
      case Complexity.Hard:
        return 'Hard';
        break;
      default:
        return 'Unknown';
    }
  }

  String get affordabilityText {
    switch (affordability) {
      case Affordability.Affordable:
        return 'Affordable';
        break;
      case Affordability.Pricey:
        return 'Pricey';
        break;
      case Affordability.Luxurious:
        return 'Luxurious';
        break;
      default:
        return 'Unknown';
    }
  }

  void selectMeal(BuildContext context) {
    Navigator.of(context)
        .pushNamed(
      MealDetailScreen.routeName,
      arguments: id,
    )
        .then((result) {
      if (result != null) {
        removeItem(result);
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: () => selectMeal(context),
      child: Card(
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(15),
        ),
        elevation: 4,
        margin: EdgeInsets.all(10),
        child: Column(
          children: <Widget>[
            Stack(
              children: <Widget>[
                ClipRRect(
                  borderRadius: BorderRadius.only(
                    topLeft: Radius.circular(15),
                    topRight: Radius.circular(15),
                  ),
                  child: Image.network(
                    imageUrl,
                    height: 250,
                    width: double.infinity,
                    fit: BoxFit.cover,
                  ),
                ),
                Positioned(
                  bottom: 20,
                  right: 10,
                  child: Container(
                    width: 300,
                    color: Colors.black54,
                    padding: EdgeInsets.symmetric(
                      vertical: 5,
                      horizontal: 20,
                    ),
                    child: Text(
                      title,
                      style: TextStyle(
                        fontSize: 26,
                        color: Colors.white,
                        fontFamily: 'Raleway',
                      ),
                      softWrap: true,
                      overflow: TextOverflow.fade,
                    ),
                  ),
                ),
              ],
            ),
            Padding(
              padding: EdgeInsets.all(20),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceAround,
                children: <Widget>[
                  Row(
                    children: <Widget>[
                      Icon(Icons.schedule),
                      SizedBox(width: 6),
                      Text('$duration min'),
                    ],
                  ),
                  Row(
                    children: <Widget>[
                      Icon(Icons.work),
                      SizedBox(width: 6),
                      Text(complexityText),
                    ],
                  ),
                  Row(
                    children: <Widget>[
                      Icon(Icons.attach_money),
                      SizedBox(width: 6),
                      Text(affordabilityText)
                    ],
                  )
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}
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