GitHub Search

In the following tutorial, we’re going to build a GitHub Search app in Flutter and AngularDart to demonstrate how we can share the data and business logic layers between the two projects.

Key Topics

• BlocProvider, Flutter widget which provides a bloc to its children.
• BlocBuilder, Flutter widget that handles building the widget in response to new states.
• Using Cubit instead of Bloc. What’s the difference?
• Prevent unnecessary rebuilds with Equatable.
• Use a custom EventTransformer with bloc_concurrency.
• Making network requests using the http package.

Common GitHub Search Library

The Common GitHub Search library will contain models, the data provider, the repository, as well as the bloc that will be shared between AngularDart and Flutter.

Setup

We’ll start off by creating a new directory for our application.

mkdir -p github_search/common_github_search

Note

The common_github_search directory will contain the shared library.

We need to create a pubspec.yaml with the required dependencies.

common_github_search/pubspec.yaml

name: common_github_search
description: Shared Code between AngularDart and Flutter
version: 1.0.0+1
publish_to: none

environment:
  sdk: ">=3.6.0 <4.0.0"

dependencies:
  bloc: ^9.0.0
  equatable: ^2.0.0
  http: ^1.0.0
  stream_transform: ^2.0.0

Lastly, we need to install our dependencies.

dart pub get

That’s it for the project setup! Now we can get to work on building out the common_github_search package.

Github Client

The GithubClient which will be providing raw data from the GitHub API.

Note

You can see a sample of what the data we get back will look like here.

Let’s create github_client.dart.

common_github_search/lib/src/github_client.dart

import 'dart:async';
import 'dart:convert';

import 'package:common_github_search/common_github_search.dart';
import 'package:http/http.dart' as http;

class GithubClient {
  GithubClient({
    http.Client? httpClient,
    this.baseUrl = 'https://api.github.com/search/repositories?q=',
  }) : httpClient = httpClient ?? http.Client();

  final String baseUrl;
  final http.Client httpClient;

  Future<SearchResult> search(String term) async {
    final response = await httpClient.get(Uri.parse('$baseUrl$term'));
    final results = json.decode(response.body) as Map<String, dynamic>;

    if (response.statusCode == 200) {
      return SearchResult.fromJson(results);
    } else {
      throw SearchResultError.fromJson(results);
    }
  }
}

Note

Our GithubClient is simply making a network request to Github’s Repository Search API and converting the result into either a SearchResult or SearchResultError as a Future.

Note

The GithubClient implementation depends on SearchResult.fromJson, which we have not yet implemented.

Next we need to define our SearchResult and SearchResultError models.

Search Result Model

Create search_result.dart, which represents a list of SearchResultItems based on the user’s query:

lib/src/models/search_result.dart

import 'package:common_github_search/common_github_search.dart';

class SearchResult {
  const SearchResult({required this.items});

  factory SearchResult.fromJson(Map<String, dynamic> json) {
    final items = (json['items'] as List<dynamic>)
        .map(
          (dynamic item) =>
              SearchResultItem.fromJson(item as Map<String, dynamic>),
        )
        .toList();
    return SearchResult(items: items);
  }

  final List<SearchResultItem> items;
}

Note

The SearchResult implementation depends on SearchResultItem.fromJson, which we have not yet implemented.

Note

We aren’t including properties that aren’t going to be used in our model.

Search Result Item Model

Next, we’ll create search_result_item.dart.

lib/src/models/search_result_item.dart

import 'package:common_github_search/common_github_search.dart';

class SearchResultItem {
  const SearchResultItem({
    required this.fullName,
    required this.htmlUrl,
    required this.owner,
  });

  factory SearchResultItem.fromJson(Map<String, dynamic> json) {
    return SearchResultItem(
      fullName: json['full_name'] as String,
      htmlUrl: json['html_url'] as String,
      owner: GithubUser.fromJson(json['owner'] as Map<String, dynamic>),
    );
  }

  final String fullName;
  final String htmlUrl;
  final GithubUser owner;
}

Note

Again, the SearchResultItem implementation dependes on GithubUser.fromJson, which we have not yet implemented.

GitHub User Model

Next, we’ll create github_user.dart.

lib/src/models/github_user.dart

class GithubUser {
  const GithubUser({
    required this.login,
    required this.avatarUrl,
  });

  factory GithubUser.fromJson(Map<String, dynamic> json) {
    return GithubUser(
      login: json['login'] as String,
      avatarUrl: json['avatar_url'] as String,
    );
  }

  final String login;
  final String avatarUrl;
}

At this point, we have finished implementing SearchResult and its dependencies. Now we’ll move onto SearchResultError.

Search Result Error Model

Create search_result_error.dart.

lib/src/models/search_result_error.dart

class SearchResultError implements Exception {
  SearchResultError({required this.message});

  factory SearchResultError.fromJson(Map<String, dynamic> json) {
    return SearchResultError(
      message: json['message'] as String,
    );
  }

  final String message;
}

Our GithubClient is finished so next we’ll move onto the GithubCache, which will be responsible for memoizing as a performance optimization.

GitHub Cache

Our GithubCache will be responsible for remembering all past queries so that we can avoid making unnecessary network requests to the GitHub API. This will also help improve our application’s performance.

Create github_cache.dart.

lib/src/github_cache.dart

import 'package:common_github_search/common_github_search.dart';

class GithubCache {
  final _cache = <String, SearchResult>{};

  SearchResult? get(String term) => _cache[term];

  void set(String term, SearchResult result) => _cache[term] = result;

  bool contains(String term) => _cache.containsKey(term);

  void remove(String term) => _cache.remove(term);
}

Now we’re ready to create our GithubRepository!

GitHub Repository

The Github Repository is responsible for creating an abstraction between the data layer (GithubClient) and the Business Logic Layer (Bloc). This is also where we’re going to put our GithubCache to use.

Create github_repository.dart.

lib/src/github_repository.dart

import 'dart:async';

import 'package:common_github_search/common_github_search.dart';

class GithubRepository {
  const GithubRepository(this.cache, this.client);

  final GithubCache cache;
  final GithubClient client;

  Future<SearchResult> search(String term) async {
    final cachedResult = cache.get(term);
    if (cachedResult != null) {
      return cachedResult;
    }
    final result = await client.search(term);
    cache.set(term, result);
    return result;
  }
}

Note

The GithubRepository has a dependency on the GithubCache and the GithubClient and abstracts the underlying implementation. Our application never has to know about how the data is being retrieved or where it’s coming from since it shouldn’t care. We can change how the repository works at any time and as long as we don’t change the interface we shouldn’t need to change any client code.

At this point, we’ve completed the data provider layer and the repository layer so we’re ready to move on to the business logic layer.

GitHub Search Event

Our Bloc will be notified when a user has typed the name of a repository which we will represent as a TextChanged GithubSearchEvent.

Create github_search_event.dart.

lib/src/github_search_bloc/github_search_event.dart

import 'package:equatable/equatable.dart';

sealed class GithubSearchEvent extends Equatable {
  const GithubSearchEvent();
}

final class TextChanged extends GithubSearchEvent {
  const TextChanged({required this.text});

  final String text;

  @override
  List<Object> get props => [text];

  @override
  String toString() => 'TextChanged { text: $text }';
}

Note

We extend Equatable so that we can compare instances of GithubSearchEvent. By default, the equality operator returns true if and only if this and other are the same instance.

Github Search State

Our presentation layer will need to have several pieces of information in order to properly lay itself out:

• SearchStateEmpty- will tell the presentation layer that no input has been given by the user.

• SearchStateLoading- will tell the presentation layer it has to display some sort of loading indicator.

• SearchStateSuccess- will tell the presentation layer that it has data to present.

  • items- will be the List<SearchResultItem> which will be displayed.

• SearchStateError- will tell the presentation layer that an error has occurred while fetching repositories.

  • error- will be the exact error that occurred.

We can now create github_search_state.dart and implement it like so.

lib/src/github_search_bloc/github_search_state.dart

import 'package:common_github_search/common_github_search.dart';
import 'package:equatable/equatable.dart';

sealed class GithubSearchState extends Equatable {
  const GithubSearchState();

  @override
  List<Object> get props => [];
}

final class SearchStateEmpty extends GithubSearchState {}

final class SearchStateLoading extends GithubSearchState {}

final class SearchStateSuccess extends GithubSearchState {
  const SearchStateSuccess(this.items);

  final List<SearchResultItem> items;

  @override
  List<Object> get props => [items];

  @override
  String toString() => 'SearchStateSuccess { items: ${items.length} }';
}

final class SearchStateError extends GithubSearchState {
  const SearchStateError(this.error);

  final String error;

  @override
  List<Object> get props => [error];
}

Note

We extend Equatable so that we can compare instances of GithubSearchState. By default, the equality operator returns true if and only if this and other are the same instance.

Now that we have our Events and States implemented, we can create our GithubSearchBloc.

GitHub Search Bloc

Create github_search_bloc.dart:

lib/src/github_search_bloc/github_search_bloc.dart

import 'package:bloc/bloc.dart';
import 'package:common_github_search/common_github_search.dart';
import 'package:stream_transform/stream_transform.dart';

const _duration = Duration(milliseconds: 300);

EventTransformer<Event> debounce<Event>(Duration duration) {
  return (events, mapper) => events.debounce(duration).switchMap(mapper);
}

class GithubSearchBloc extends Bloc<GithubSearchEvent, GithubSearchState> {
  GithubSearchBloc({required this.githubRepository})
      : super(SearchStateEmpty()) {
    on<TextChanged>(_onTextChanged, transformer: debounce(_duration));
  }

  final GithubRepository githubRepository;

  Future<void> _onTextChanged(
    TextChanged event,
    Emitter<GithubSearchState> emit,
  ) async {
    final searchTerm = event.text;

    if (searchTerm.isEmpty) return emit(SearchStateEmpty());

    emit(SearchStateLoading());

    try {
      final results = await githubRepository.search(searchTerm);
      emit(SearchStateSuccess(results.items));
    } catch (error) {
      emit(
        error is SearchResultError
            ? SearchStateError(error.message)
            : const SearchStateError('something went wrong'),
      );
    }
  }
}

Note

Our GithubSearchBloc converts GithubSearchEvent to GithubSearchState and has a dependency on the GithubRepository.

Note

We create a custom EventTransformer to debounce the GithubSearchEvents. One of the reasons why we created a Bloc instead of a Cubit was to take advantage of stream transformers.

Awesome! We’re all done with our common_github_search package. The finished product should look like this.

Next, we’ll work on the Flutter implementation.

Flutter GitHub Search

Flutter Github Search will be a Flutter application which reuses the models, data providers, repositories, and blocs from common_github_search to implement Github Search.

Setup

We need to start by creating a new Flutter project in our github_search directory at the same level as common_github_search.

flutter create flutter_github_search

Next, we need to update our pubspec.yaml to include all the necessary dependencies.

flutter_github_search/pubspec.yaml

name: flutter_github_search
description: A new Flutter project.
version: 1.0.0+1
publish_to: none

environment:
  sdk: ">=3.6.0 <4.0.0"

dependencies:
  bloc: ^9.0.0
  common_github_search:
    path: ../common_github_search
  flutter:
    sdk: flutter
  flutter_bloc: ^9.0.1
  url_launcher: ^6.0.0

flutter:
  uses-material-design: true

Note

We are including our newly created common_github_search library as a dependency.

Now, we need to install the dependencies.

flutter packages get

That’s it for project setup. Since the common_github_search package contains our data layer as well as our business logic layer, all we need to build is the presentation layer.

Search Form

We’re going to need to create a form with a _SearchBar and _SearchBody widget.

• _SearchBar will be responsible for taking user input.
• _SearchBody will be responsible for displaying search results, loading indicators, and errors.

Let’s create search_form.dart.

Our SearchForm will be a StatelessWidget which renders the _SearchBar and _SearchBody widgets.

_SearchBar is also going to be a StatefulWidget because it will need to maintain its own TextEditingController so that we can keep track of what a user has entered as input.

_SearchBody is a StatelessWidget which will be responsible for displaying search results, errors, and loading indicators. It will be the consumer of the GithubSearchBloc.

If our state is SearchStateSuccess, we render _SearchResults which we will implement next.

_SearchResults is a StatelessWidget which takes a List<SearchResultItem> and displays them as a list of _SearchResultItems.

_SearchResultItem is a StatelessWidget and is responsible for rendering the information for a single search result. It is also responsible for handling user interaction and navigating to the repository url on a user tap.

flutter_github_search/lib/search_form.dart

import 'package:common_github_search/common_github_search.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:url_launcher/url_launcher.dart';

class SearchForm extends StatelessWidget {
  const SearchForm({super.key});

  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        _SearchBar(),
        _SearchBody(),
      ],
    );
  }
}

class _SearchBar extends StatefulWidget {
  @override
  State<_SearchBar> createState() => _SearchBarState();
}

class _SearchBarState extends State<_SearchBar> {
  final _textController = TextEditingController();
  late GithubSearchBloc _githubSearchBloc;

  @override
  void initState() {
    super.initState();
    _githubSearchBloc = context.read<GithubSearchBloc>();
  }

  @override
  void dispose() {
    _textController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return TextField(
      controller: _textController,
      autocorrect: false,
      onChanged: (text) {
        _githubSearchBloc.add(
          TextChanged(text: text),
        );
      },
      decoration: InputDecoration(
        prefixIcon: const Icon(Icons.search),
        suffixIcon: GestureDetector(
          onTap: _onClearTapped,
          child: const Icon(Icons.clear),
        ),
        border: InputBorder.none,
        hintText: 'Enter a search term',
      ),
    );
  }

  void _onClearTapped() {
    _textController.text = '';
    _githubSearchBloc.add(const TextChanged(text: ''));
  }
}

class _SearchBody extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return BlocBuilder<GithubSearchBloc, GithubSearchState>(
      builder: (context, state) {
        return switch (state) {
          SearchStateEmpty() => const Text('Please enter a term to begin'),
          SearchStateLoading() => const CircularProgressIndicator.adaptive(),
          SearchStateError() => Text(state.error),
          SearchStateSuccess() => state.items.isEmpty
              ? const Text('No Results')
              : Expanded(child: _SearchResults(items: state.items)),
        };
      },
    );
  }
}

class _SearchResults extends StatelessWidget {
  const _SearchResults({required this.items});

  final List<SearchResultItem> items;

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: items.length,
      itemBuilder: (BuildContext context, int index) {
        return _SearchResultItem(item: items[index]);
      },
    );
  }
}

class _SearchResultItem extends StatelessWidget {
  const _SearchResultItem({required this.item});

  final SearchResultItem item;

  @override
  Widget build(BuildContext context) {
    return ListTile(
      leading: CircleAvatar(
        child: Image.network(item.owner.avatarUrl),
      ),
      title: Text(item.fullName),
      onTap: () => launchUrl(Uri.parse(item.htmlUrl)),
    );
  }
}

Note

_SearchBar accesses GitHubSearchBloc via context.read<GithubSearchBloc>() and notifies the bloc of TextChanged events.

Note

_SearchBody uses BlocBuilder in order to rebuild in response to state changes. Since the bloc parameter of the BlocBuilder object was omitted, BlocBuilder will automatically perform a lookup using BlocProvider and the current BuildContext. Read more here.

Note

We use ListView.builder in order to construct a scrollable list of _SearchResultItem.

Note

We use the url_launcher package to open external urls.

Putting it all together

Now all that’s left to do is implement our main app in main.dart.

flutter_github_search/lib/main.dart

import 'package:common_github_search/common_github_search.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flutter_github_search/search_form.dart';

void main() {
  final githubRepository = GithubRepository(
    GithubCache(),
    GithubClient(),
  );

  runApp(App(githubRepository: githubRepository));
}

class App extends StatelessWidget {
  const App({required this.githubRepository, super.key});

  final GithubRepository githubRepository;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'GitHub Search',
      home: Scaffold(
        appBar: AppBar(title: const Text('GitHub Search')),
        body: BlocProvider(
          create: (_) => GithubSearchBloc(githubRepository: githubRepository),
          child: const SearchForm(),
        ),
      ),
    );
  }
}

Note

Our GithubRepository is created in main and injected into our App. Our SearchForm is wrapped in a BlocProvider which is responsible for initializing, closing, and making the instance of GithubSearchBloc available to the SearchForm widget and its children.

That’s all there is to it! We’ve now successfully implemented a GitHub search app in Flutter using the bloc and flutter_bloc packages and we’ve successfully separated our presentation layer from our business logic.

The full source can be found here.

Finally, we’re going to build our AngularDart GitHub Search app.

AngularDart GitHub Search

AngularDart GitHub Search will be an AngularDart application which reuses the models, data providers, repositories, and blocs from common_github_search to implement Github Search.

Setup

We need to start by creating a new AngularDart project in our github_search directory at the same level as common_github_search.

stagehand web-angular

Note

You can install stagehand via:

dart pub global activate stagehand

We can then go ahead and replace the contents of pubspec.yaml with:

angular_github_search/pubspec.yaml

name: angular_github_search
description: A web app that uses AngularDart Components

environment:
  sdk: ">=3.6.0 <4.0.0"

dependencies:
  angular_bloc: ^10.0.0-dev.5
  bloc: ^9.0.0
  common_github_search:
    path: ../common_github_search
  ngdart: ^8.0.0-dev.4

dev_dependencies:
  build_daemon: ^4.0.0
  build_runner: ^2.0.0
  build_web_compilers: ^4.0.0

Search Form

Just like in our Flutter app, we’re going to need to create a SearchForm with a SearchBar and SearchBody component.

Our SearchForm component will implement OnInit and OnDestroy because it will need to create and close a GithubSearchBloc.

• SearchBar will be responsible for taking user input.
• SearchBody will be responsible for displaying search results, loading indicators, and errors.

Let’s create search_form_component.dart.

angular_github_search/lib/src/search_form/search_form_component.dart

import 'package:angular_bloc/angular_bloc.dart';
import 'package:angular_github_search/src/github_search.dart';
import 'package:common_github_search/common_github_search.dart';
import 'package:ngdart/angular.dart';

@Component(
  selector: 'search-form',
  templateUrl: 'search_form_component.html',
  directives: [
    SearchBarComponent,
    SearchBodyComponent,
  ],
  pipes: [BlocPipe],
)
class SearchFormComponent implements OnInit, OnDestroy {
  @Input()
  late GithubRepository githubRepository;

  late GithubSearchBloc githubSearchBloc;

  @override
  void ngOnInit() {
    githubSearchBloc = GithubSearchBloc(
      githubRepository: githubRepository,
    );
  }

  @override
  void ngOnDestroy() {
    githubSearchBloc.close();
  }
}

Note

The GithubRepository is injected into the SearchFormComponent.

Note

The GithubSearchBloc is created and closed by the SearchFormComponent.

Our template (search_form_component.html) will look like:

angular_github_search/lib/src/search_form/search_form_component.html

<div>
  <h1>GitHub Search</h1>
  <search-bar [githubSearchBloc]="githubSearchBloc"></search-bar>
  <search-body [state]="$pipe.bloc(githubSearchBloc)"></search-body>
</div>

Next, we’ll implement the SearchBar component.

Search Bar

SearchBar is a component which will be responsible for taking in user input and notifying the GithubSearchBloc of text changes.

Create search_bar_component.dart.

angular_github_search/lib/src/search_form/search_bar/search_bar_component.dart

import 'package:common_github_search/common_github_search.dart';
import 'package:ngdart/angular.dart';

@Component(
  selector: 'search-bar',
  templateUrl: 'search_bar_component.html',
)
class SearchBarComponent {
  @Input()
  late GithubSearchBloc githubSearchBloc;

  void onTextChanged(String text) {
    githubSearchBloc.add(TextChanged(text: text));
  }
}

Note

SearchBarComponent has a dependency on GitHubSearchBloc because it is responsible for notifying the bloc of TextChanged events.

Next, we can create search_bar_component.html.

angular_github_search/lib/src/search_form/search_bar/search_bar_component.html

<label for="term" class="clip">Enter a search term</label>
<input
  id="term"
  placeholder="Enter a search term"
  class="input-reset outline-transparent glow o-50 bg-near-black near-white w-100 pv2 border-box b--white-50 br-0 bl-0 bt-0 bb-ridge mb3"
  autofocus
  (keyup)="onTextChanged($event.target.value)"
/>

We’re done with SearchBar, now onto SearchBody.

Search Body

SearchBody is a component which will be responsible for displaying search results, errors, and loading indicators. It will be the consumer of the GithubSearchBloc.

Create search_body_component.dart.

angular_github_search/lib/src/search_form/search_body/search_body_component.dart

import 'package:angular_github_search/src/github_search.dart';
import 'package:common_github_search/common_github_search.dart';
import 'package:ngdart/angular.dart';

@Component(
  selector: 'search-body',
  templateUrl: 'search_body_component.html',
  directives: [
    coreDirectives,
    SearchResultsComponent,
  ],
)
class SearchBodyComponent {
  @Input()
  late GithubSearchState state;

  bool get isEmpty => state is SearchStateEmpty;
  bool get isLoading => state is SearchStateLoading;
  bool get isSuccess => state is SearchStateSuccess;
  bool get isError => state is SearchStateError;

  List<SearchResultItem> get items =>
      isSuccess ? (state as SearchStateSuccess).items : [];

  String get error => isError ? (state as SearchStateError).error : '';
}

Note

SearchBodyComponent has a dependency on GithubSearchState which is provided by the GithubSearchBloc using the angular_bloc bloc pipe.

Create search_body_component.html.

angular_github_search/lib/src/search_form/search_body/search_body_component.html

<div *ngIf="state != null" class="mw10">
  <div *ngIf="isEmpty" class="tc">
    <span>🔍</span>
    <p>Please enter a term to begin</p>
  </div>
  <div *ngIf="isLoading">
    <div class="sk-chase center">
      <div class="sk-chase-dot"></div>
      <div class="sk-chase-dot"></div>
      <div class="sk-chase-dot"></div>
      <div class="sk-chase-dot"></div>
      <div class="sk-chase-dot"></div>
      <div class="sk-chase-dot"></div>
    </div>
  </div>
  <div *ngIf="isError" class="tc">
    <span>‼️</span>
    <p>{{ error }}</p>
  </div>
  <div *ngIf="isSuccess">
    <div *ngIf="items.length == 0" class="tc">
      <span>⚠️</span>
      <p>No Results</p>
    </div>
    <search-results [items]="items"></search-results>
  </div>
</div>

If our state isSuccess, we render SearchResults. We will implement it next.

Search Results

SearchResults is a component which takes a List<SearchResultItem> and displays them as a list of SearchResultItems.

Create search_results_component.dart.

angular_github_search/lib/src/search_form/search_body/search_results/search_results_component.dart

import 'package:angular_github_search/src/github_search.dart';
import 'package:common_github_search/common_github_search.dart';
import 'package:ngdart/angular.dart';

@Component(
  selector: 'search-results',
  templateUrl: 'search_results_component.html',
  directives: [coreDirectives, SearchResultItemComponent],
)
class SearchResultsComponent {
  @Input()
  late List<SearchResultItem> items;
}

Next up we’ll create search_results_component.html.

angular_github_search/lib/src/search_form/search_body/search_results/search_results_component.html

<ul class="list pa0 ma0">
  <li *ngFor="let item of items" class="pa2 cf">
    <search-result-item [item]="item"></search-result-item>
  </li>
</ul>

Note

We use ngFor in order to construct a list of SearchResultItem components.

It’s time to implement SearchResultItem.

Search Result Item

SearchResultItem is a component that is responsible for rendering the information for a single search result. It is also responsible for handling user interaction and navigating to the repository url on a user tap.

Create search_result_item_component.dart.

angular_github_search/lib/src/search_form/search_body/search_results/search_result_item/search_result_item_component.dart

import 'package:common_github_search/common_github_search.dart';
import 'package:ngdart/angular.dart';

@Component(
  selector: 'search-result-item',
  templateUrl: 'search_result_item_component.html',
)
class SearchResultItemComponent {
  @Input()
  late SearchResultItem item;
}

and the corresponding template in search_result_item_component.html.

angular_github_search/lib/src/search_form/search_body/search_results/search_result_item/search_result_item_component.html

<div class="fl w-10 h-auto">
  <img class="br-100" src="{{ item.owner.avatarUrl }}" />
</div>
<div class="fl w-90 ph3">
  <h1 class="f5 ma0">{{ item.fullName }}</h1>
  <p>
    <a href="{{ item.htmlUrl }}" class="light-blue" target="_blank">{{
      item.htmlUrl
    }}</a>
  </p>
</div>

Putting it all together

We have all of our components and now it’s time to put them all together in our app_component.dart.

angular_github_search/lib/app_component.dart

import 'package:angular_github_search/src/github_search.dart';
import 'package:common_github_search/common_github_search.dart';
import 'package:ngdart/angular.dart';

@Component(
  selector: 'my-app',
  template: '<search-form [githubRepository]="githubRepository"></search-form>',
  directives: [SearchFormComponent],
)
class AppComponent {
  final githubRepository = GithubRepository(
    GithubCache(),
    GithubClient(),
  );
}

Note

We’re creating the GithubRepository in the AppComponent and injecting it into the SearchForm component.

That’s all there is to it! We’ve now successfully implemented a GitHub search app in AngularDart using the bloc and angular_bloc packages and we’ve successfully separated our presentation layer from our business logic.

The full source can be found here.

Summary

In this tutorial we created a Flutter and AngularDart app while sharing all of the models, data providers, and blocs between the two.

The only thing we actually had to write twice was the presentation layer (UI) which is awesome in terms of efficiency and development speed. In addition, it’s fairly common for web apps and mobile apps to have different user experiences and styles and this approach really demonstrates how easy it is to build two apps that look totally different but share the same data and business logic layers.

The full source can be found here.