Implementation of BloC in home page

lib/data/repository/rest/user_rest.dart

@@ -4,34 +4,42 @@ import 'package:hackatrix/data/repository/user_repository.dart';
 import 'package:hackatrix/data/repository/util/api.dart';
 import 'package:hackatrix/data/repository/util/network_util.dart';
 import 'package:hackatrix/domain/model/user.dart';
+import 'package:hackatrix/presentation/profile/login/bloc/authenticate/login_bloc.dart';
 
 class UserRest implements UserRepository {
-
   NetworkUtil _netUtil = new NetworkUtil();
 
   @override
-  Future<String> authenticate(String username, String password){
-    return _netUtil.post(API_USER_AUTHENTICATE, body: {"username": username, "password": password}).then((dynamic response) {
+  Future<String> authenticate(LoginCredentials credentials) {
+    return _netUtil.post(API_USER_AUTHENTICATE, body: {
+      "username": credentials.username,
+      "password": credentials.password
+    }).then((dynamic response) {
       String token = response['token'];
-      if (token != null && token.isNotEmpty){
+      if (token != null && token.isNotEmpty) {
         return token;
       }
-      throw new Exception("Email/Contraseña incorrectos");
+      if (response["non_field_errors"] != null) {
+        throw ("Unable to log in with provided credentials");
+      }
+
+      throw ("Email/Contraseña incorrectos");
     });
   }
 
   @override
   Future<User> profile(String token) {
-   return _netUtil.get(API_USER_PROFILE, headers: {"Authorization" : "Token $token"}).then((dynamic response) {
+    return _netUtil.get(API_USER_PROFILE,
+        headers: {"Authorization": "Token $token"}).then((dynamic response) {
       Map<String, dynamic> data = response as Map<String, dynamic>;
       return User.fromJson(data['user']);
     });
   }
 
   @override
-    Future<bool> logout() {
-       return _netUtil.post(API_USER_LOGOUT).then((dynamic response) {
-          return true;
-       });
-    }
-}
+  Future<bool> logout() {
+    return _netUtil.post(API_USER_LOGOUT).then((dynamic response) {
+      return true;
+    });
+  }
+}

lib/data/repository/user_repository.dart

@@ -1,9 +1,10 @@
 import 'dart:async';
 
 import 'package:hackatrix/domain/model/user.dart';
+import 'package:hackatrix/presentation/profile/login/bloc/authenticate/login_bloc.dart';
 
 abstract class UserRepository {
-  Future<String> authenticate(String username, String password);
+  Future<String> authenticate(LoginCredentials credentials);
   Future<User> profile(String token);
   Future<bool> logout();
 }

lib/main.dart

@@ -1,17 +1,19 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
-import 'package:hackatrix/presentation/home/home_page.dart';
+import 'package:hackatrix/data/repository/rest/event_rest.dart';
+import 'package:hackatrix/presentation/home/bloc/home_bloc.dart';
+import 'package:hackatrix/presentation/home/bloc/home_page_2.dart';
+import 'package:hackatrix/presentation/home/bloc/home_provider.dart';
 import 'package:hackatrix/presentation/util/theme.dart' as theme;
 
 void main() => runApp(new HackatrixApp());
 
 class HackatrixApp extends StatelessWidget {
-
-  @override
   Widget build(BuildContext context) {
     config();
-    return new MaterialApp(
-      home:  new HomePage(),
+    return MaterialApp(
+      home:
+          HomeProvider(homeBloc: HomeBloc(EventRest()), child: HomePage2(true)),
       theme: theme.CompanyThemeData,
     );
   }

lib/presentation/home/bloc/home_bloc.dart

@@ -0,0 +1,24 @@
+import 'dart:async';
+import 'package:hackatrix/data/repository/event_repository.dart';
+import 'package:hackatrix/domain/model/event.dart';
+import 'package:rxdart/rxdart.dart';
+
+class HomeBloc {
+  final EventRepository repository;
+
+  Stream<List<Event>> _results = Stream.empty();
+  ReplaySubject<int> _query = ReplaySubject<int>();
+
+  // Getters
+  Stream<List<Event>> get results => _results;
+
+  Sink<int> get query => _query;
+
+  HomeBloc(this.repository) {
+    _results = _query.asyncMap(repository.getEventList).asBroadcastStream();
+  }
+
+  void dispose() {
+    _query.close();
+  }
+}

lib/presentation/home/bloc/home_page_2.dart

@@ -0,0 +1,95 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
+import 'package:hackatrix/domain/model/event.dart';
+import 'package:hackatrix/presentation/event_detail/event_detail_page.dart';
+import 'package:hackatrix/presentation/home/bloc/home_bloc.dart';
+import 'package:hackatrix/presentation/home/home_item.dart';
+import 'package:hackatrix/presentation/home/bloc/home_provider.dart';
+import 'package:hackatrix/presentation/menu/menu_page.dart';
+import 'package:hackatrix/presentation/util/constants.dart';
+import 'package:hackatrix/presentation/util/custom_widgets/my_scaffold.dart';
+
+class HomePage2 extends StatelessWidget {
+  //Completer<Null> _completer;
+
+  final GlobalKey<RefreshIndicatorState> _refreshIndicatorKey =
+      new GlobalKey<RefreshIndicatorState>();
+  final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
+  Completer<Null> _completer;
+
+  bool isFirstLaunched;
+
+  // Events
+  void _onTapEvent(Event event, BuildContext context) {
+    print("event tapped: ${event.title}");
+    Navigator.push(
+      context,
+      new MaterialPageRoute(
+        builder: (BuildContext context) => new EventDetailPage(event),
+      ),
+    );
+  }
+
+  HomePage2(this.isFirstLaunched);
+
+  @override
+  Widget build(BuildContext context) {
+    final HomeBloc homeBloc = HomeProvider.of(context);
+
+    if (isFirstLaunched) {
+      homeBloc.query.add(1);
+      isFirstLaunched = false;
+    }
+
+    return MyScaffold(
+      key: _scaffoldKey,
+      title: APP_NAME,
+      drawer: Drawer(
+        child: MenuSidePage(_scaffoldKey),
+      ),
+      body: buildStaggeredGridView(homeBloc),
+    );
+  }
+
+  Widget buildStaggeredGridView(HomeBloc homeBloc) {
+    return StreamBuilder(
+      stream: homeBloc.results,
+      builder: (context, snapshot) {
+        if (!snapshot.hasData) {
+          return Center(
+            child: CircularProgressIndicator(),
+          );
+        } else {
+          return RefreshIndicator(
+            key: _refreshIndicatorKey,
+            child: StaggeredGridView.countBuilder(
+                crossAxisCount: 2,
+                padding: EdgeInsets.all(4.0),
+                itemCount: snapshot.data == null ? 0 : snapshot.data.length,
+                staggeredTileBuilder: (int index) =>
+                    new StaggeredTile.count(index == 0 ? 2 : 1, 1.2),
+                mainAxisSpacing: 5.0,
+                crossAxisSpacing: 5.0,
+                itemBuilder: (BuildContext context, int index) => new HomeItem(
+                    snapshot.data[index], context,
+                    callBack: _onTapEvent)),
+            onRefresh: () async {
+              _completer = new Completer<Null>();
+
+              homeBloc.query.add(1);
+
+              homeBloc.results.listen((List<Event> list) {
+                if (_completer != null && !_completer.isCompleted)
+                  _completer.complete();
+              });
+
+              return _completer.future;
+            },
+          );
+        }
+      },
+    );
+  }
+}

lib/presentation/home/bloc/home_provider.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/widgets.dart';
+import 'package:hackatrix/data/repository/rest/event_rest.dart';
+import 'package:hackatrix/presentation/home/bloc/home_bloc.dart';
+
+//  InheritedWidget Allows to pass its sates to his child widgets
+class HomeProvider extends InheritedWidget {
+  final HomeBloc homeBloc;
+
+  @override
+  bool updateShouldNotify(InheritedWidget oldWidget) {
+    return true;
+  }
+
+  // To access the block from anywhere in the application
+  static HomeBloc of(BuildContext context) =>
+      (context.inheritFromWidgetOfExactType(HomeProvider) as HomeProvider)
+          .homeBloc;
+
+  HomeProvider({Key key, HomeBloc homeBloc, Widget child})
+      : this.homeBloc = homeBloc ?? HomeBloc(EventRest()),
+        super(child: child, key: key);
+}

lib/presentation/home/home_item.dart

@@ -2,11 +2,13 @@ import 'package:flutter/material.dart';
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:hackatrix/domain/model/event.dart';
 
-typedef void OnTapItemCallBack(Event item);
+typedef void OnTapItemCallBack(Event item, BuildContext context);
 
 class HomeItem extends StatelessWidget {
-  HomeItem(this._event, {this.callBack});
+  HomeItem(this._event, this.context,{this.callBack});
+
   final Event _event;
+  final BuildContext context;
   final OnTapItemCallBack callBack;
 
   @override
@@ -21,25 +23,29 @@ class HomeItem extends StatelessWidget {
     );
 
     return new Container(
-        key: new Key("${_event.id}"),
-        child: new Stack(children: <Widget>[
+      key: new Key("${_event.id}"),
+      child: new Stack(
+        children: <Widget>[
           new GridTile(
             child: imageHero,
             footer: new GridTileBar(
-              title: new Text(_event.title, overflow: TextOverflow.clip,  style: new TextStyle(
-                  color: Colors.white,
-                  fontSize: 14.0,
-                  fontWeight: FontWeight.w400
-                )),
+              title: new Text(_event.title,
+                  overflow: TextOverflow.clip,
+                  style: new TextStyle(
+                      color: Colors.white,
+                      fontSize: 14.0,
+                      fontWeight: FontWeight.w400)),
               backgroundColor: Colors.black38,
             ),
           ),
           new Positioned.fill(
               child: new Material(
                   color: Colors.transparent,
                   child: new InkWell(
-                    onTap: () => callBack(_event),
+                    onTap: () => callBack(_event,context),
                   ))),
-        ]));
+        ],
+      ),
+    );
   }
 }

lib/presentation/home/home_page.dart

@@ -21,9 +21,9 @@ class _HomePageState extends State<HomePage> implements HomeView {
   List<Event> _elements = List();
   Completer<Null> _completer;
   final GlobalKey<RefreshIndicatorState> _refreshIndicatorKey =
-      new GlobalKey<RefreshIndicatorState>();
+  new GlobalKey<RefreshIndicatorState>();
   final GlobalKey<ScaffoldState> _scaffoldKey =
-      new GlobalKey<ScaffoldState>();
+  new GlobalKey<ScaffoldState>();
 
   _HomePageState() {
     _presenter = new HomePresenter(this, new EventRest());
@@ -53,11 +53,11 @@ class _HomePageState extends State<HomePage> implements HomeView {
     });
   }
 
-  void _onTapEvent(Event event){
+  void _onTapEvent(Event event, BuildContext context) {
     print("event tapped: ${event.title}");
     Navigator.push(context, new MaterialPageRoute(
-              builder: (BuildContext context) => new EventDetailPage(event),
-            ),);
+      builder: (BuildContext context) => new EventDetailPage(event),
+    ),);
   }
 
   @override
@@ -76,20 +76,20 @@ class _HomePageState extends State<HomePage> implements HomeView {
     return new RefreshIndicator(
       key: _refreshIndicatorKey,
       child: StaggeredGridView.countBuilder(
-        crossAxisCount: 2,
-        padding: EdgeInsets.all(4.0),
-        itemCount: _elements.length,
-        staggeredTileBuilder: (int index) =>
-            new StaggeredTile.count(index == 0 ? 2 : 1, 1.2),
-        mainAxisSpacing: 5.0,
-        crossAxisSpacing: 5.0,
-        itemBuilder: (BuildContext context, int index) =>
-            new HomeItem(_elements[index], callBack: _onTapEvent)
+          crossAxisCount: 2,
+          padding: EdgeInsets.all(4.0),
+          itemCount: _elements.length,
+          staggeredTileBuilder: (int index) =>
+          new StaggeredTile.count(index == 0 ? 2 : 1, 1.2),
+          mainAxisSpacing: 5.0,
+          crossAxisSpacing: 5.0,
+          itemBuilder: (BuildContext context, int index) =>
+          new HomeItem(_elements[index], context, callBack: _onTapEvent)
       ),
       onRefresh: _refreshList,
     );
   }
-  
+
 
 }