Dynamic Theme Changing Challange

dashboard.dart

import 'package:bytebank/main.dart';
import 'package:bytebank/screens/contact/list.dart';
import 'package:bytebank/screens/transactions/list.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

class Dashboard extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Dashboard'), actions: <Widget>[
        // action button
        IconButton(
          icon: Icon(Icons.lightbulb_outline),
          onPressed: () {
            Provider.of<AppConfig>(context, listen: false).toggle();
          },
        ),
      ]),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: <Widget>[
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: Image.asset('images/bytebank_logo.png'),
          ),
          Container(
            height: 120,
            child: ListView(
              scrollDirection: Axis.horizontal,
              children: [
                _FeatureItem(
                  'Transfer',
                  Icons.monetization_on,
                  onClick: () {
                    _showContactsList(context);
                  },
                ),
                _FeatureItem(
                  'Transaction Feed',
                  Icons.description,
                  onClick: () => _showTransactionsList(context),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  void _showContactsList(BuildContext context) {
    Navigator.of(context).push(
      MaterialPageRoute(
        builder: (context) => ContactsList(),
      ),
    );
  }

  _showTransactionsList(BuildContext context) {
    Navigator.of(context).push(
      MaterialPageRoute(
        builder: (context) => TransactionsList(),
      ),
    );
  }
}

class _FeatureItem extends StatelessWidget {
  final String name;
  final IconData icon;
  final Function onClick;

  _FeatureItem(
    this.name,
    this.icon, {
    @required this.onClick,
  })  : assert(icon != null),
        assert(onClick != null);

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(8.0),
      child: Material(
        color: Theme.of(context).primaryColor,
        child: InkWell(
          onTap: () => onClick(),
          child: Container(
            padding: EdgeInsets.all(8.0),
            width: 150,
            child: Column(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              crossAxisAlignment: CrossAxisAlignment.start,
              children: <Widget>[
                Icon(
                  icon,
                  color: Colors.white,
                  size: 24.0,
                ),
                Text(
                  name,
                  style: TextStyle(
                    color: Colors.white,
                    fontSize: 16.0,
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

main.dart

import 'package:bytebank/screens/dashboard.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

void main() => runApp(
      ChangeNotifierProvider.value(
        value: AppConfig(),
        child: BytebankApp(),
      ),
    );

class BytebankApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: Provider.of<AppConfig>(context).darkMode
          ? ThemeData.dark()
          : bytebankTheme(),
      home: Dashboard(),
    );
  }
}

class AppConfig extends ChangeNotifier {
  bool _darkMode = false;

  bool get darkMode {
    return _darkMode;
  }

  void toggle() {
    this._darkMode = !this._darkMode;
    print('toggle: ${this._darkMode}');
    notifyListeners();
  }
}

ThemeData bytebankTheme() {
  return ThemeData(
    primaryColor: Colors.green[900],
    accentColor: Colors.blueAccent[700],
    buttonTheme: ButtonThemeData(
      buttonColor: Colors.blueAccent[700],
      textTheme: ButtonTextTheme.primary,
    ),
  );
}

pubspec.yaml

name: bytebank
description: A new Flutter project.

# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter


  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.3

dev_dependencies:
  flutter_test:
    sdk: flutter
  sqflite:
  path:
  provider: ^4.0.0



# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
   - images/bytebank_logo.png

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages