Deleted the CurrentSelectionService and moved to route parameters

lib/src/App.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 
+import 'screens/event_screen.dart';
 import 'screens/home_screen.dart';
 import 'screens/initial_loading_screen.dart';
 import 'screens/login_screen.dart';
@@ -49,6 +50,7 @@ class App extends StatelessWidget {
         builder: (BuildContext context) {
           return TaskScreen(
             isEdit: true,
+            taskId: routeTokens[1],
           );
         },
       );
@@ -58,6 +60,14 @@ class App extends StatelessWidget {
           return NewImageScreen();
         },
       );
+    } else if (routeTokens.first == 'event') {
+      return MaterialPageRoute(
+        builder: (BuildContext context) {
+          return EventScreen(
+            eventName: routeTokens[1],
+          );
+        },
+      );
     }
     // Default route.
     return MaterialPageRoute(

lib/src/blocs/event_bloc.dart

@@ -1,18 +1,16 @@
 import 'dart:async';
+import 'package:meta/meta.dart';
 
 import '../resources/firestore_provider.dart';
 import '../resources/firebase_storage_provider.dart';
-import '../services/current_selection_service.dart';
 
 /// A business logic component that manages the state for an event screen.
 class EventBloc {
-  /// An instance of the current selection service.
-  final CurrentSelectionService _selectionService = currentSelectionService;
-
-  /// The name of the event that's currently selected.
-  ///
-  /// Read only.
-  String get selectedEventName => _selectionService.event.name;
+  /// The name of the event being shown.
+  final String eventName;
+  EventBloc({
+    @required this.eventName,
+  });
 
   /// Fetches the tasks for the current user that a part of the currently
   /// selected event.

lib/src/blocs/home_bloc.dart

@@ -5,7 +5,6 @@ import 'package:rxdart/rxdart.dart';
 import '../models/task_model.dart';
 import '../resources/firestore_provider.dart';
 import '../services/auth_service.dart';
-import '../services/current_selection_service.dart';
 
 export '../services/auth_service.dart' show FirebaseUser;
 
@@ -19,9 +18,6 @@ class HomeBloc {
   /// An instance of the firebase repository.
   final FirestoreProvider _firestore = firestoreProvider;
 
-  /// An instance of the current task service.
-  final CurrentSelectionService _selectionService = currentSelectionService;
-
   /// A subject of list of task model.
   final _tasks = BehaviorSubject<List<TaskModel>>();
 
@@ -113,19 +109,6 @@ class HomeBloc {
     );
   }
 
-  /// Sets the global selected task.
-  void updateSelectedTask(TaskModel task) {
-    _selectionService.updateSelectedTask(task);
-  }
-
-  /// Updated the global selected event.
-  void updateSelectedEvent(TaskModel task) async {
-    final userModel = await _auth.getCurrentUserModel();
-    final event =
-        await _firestore.getEvent(userModel.id, eventName: task.event);
-    _selectionService.updateSelectedEvent(event);
-  }
-
   /// Updates the serach box text.
   void updateSearchBoxText(String newText) {
     _searchBoxText.add(newText);

lib/src/blocs/task_bloc.dart

@@ -7,7 +7,6 @@ import '../models/task_model.dart';
 import '../models/user_model.dart';
 import '../resources/firestore_provider.dart';
 import '../services/auth_service.dart';
-import '../services/current_selection_service.dart';
 
 /// Business logic component that manages the state for the task screen.
 class TaskBloc extends Object with Validators {
@@ -17,19 +16,24 @@ class TaskBloc extends Object with Validators {
   /// An instance of the firebase repository.
   final FirestoreProvider _firestore = firestoreProvider;
 
-  /// An instance of the current task service.
-  final CurrentSelectionService _selectionService = currentSelectionService;
-
   /// A subject of user model.
+  ///
+  /// Needed to access the username of the owner of the task.
   final _user = BehaviorSubject<UserModel>();
 
   /// A subject of task event name.
+  ///
+  /// Only needed if in edit mode. This will receive updates when the task to be
+  /// edited is fetched.
   final _eventName = BehaviorSubject<String>();
 
   /// A subject of task text.
   final _taskText = BehaviorSubject<String>();
 
   ///  A subject of the text of the current global task.
+  ///
+  /// Only needed if in edit mode. This will receive updates when the task to be
+  /// edited is fetched.
   final _textInitialValue = BehaviorSubject<String>();
 
   /// The priority of the current task.
@@ -37,10 +41,10 @@ class TaskBloc extends Object with Validators {
 
   /// The id of the current task.
   ///
-  /// Only to be used if editing an existing task.
-  String taskId;
+  /// Only needed if in edit mode. Not needed by the UI.
+  final String taskId;
 
-  //Stream getters.
+  // Stream getters.
   /// An observable of the current user model.
   Observable<UserModel> get userModelStream => _user.stream;
 
@@ -48,14 +52,20 @@ class TaskBloc extends Object with Validators {
   Observable<String> get eventName => _eventName.stream;
 
   /// An observable of the current task text.
+  ///
+  /// Emits an error if the string added is empty.
   Observable<String> get taskText =>
       _taskText.stream.transform(validateStringNotEmpty);
 
   /// An observable of the submit enabled flag.
+  ///
+  /// Only emits true when an event is selected and the task text is not empty.
   Observable<bool> get submitEnabled =>
       Observable.combineLatest2(eventName, taskText, (a, b) => true);
 
   /// An observable of the text of the global selected task.
+  ///
+  /// Only needed in edit mode.
   Observable<String> get textInitialvalue => _textInitialValue.stream;
 
   //Sinks getters.
@@ -65,7 +75,7 @@ class TaskBloc extends Object with Validators {
   ///Changes the current task text.
   Function(String) get changeTaskText => _taskText.sink.add;
 
-  TaskBloc() {
+  TaskBloc({this.taskId}) {
     setCurrentUser();
   }
 
@@ -76,7 +86,6 @@ class TaskBloc extends Object with Validators {
 
   //TODO: Figure out how to update the event and user properties if needed.
   // as in the number of pending high tasks for example.
-
   /// Saves or updates the current task in the database.
   Future<void> submit(isEdit) {
     if (isEdit) {
@@ -105,17 +114,11 @@ class TaskBloc extends Object with Validators {
 
   /// Grabs the data from the current global task and pipes it to the local
   /// streams.
-  void populateWithCurrentTask() {
-    // We only want the task that was just selected and stop listening
-    // after receiving it.
-    _selectionService.task.take(1).listen(
-      (TaskModel task) {
+  void populateWithCurrentTask() async {
+    final task = await _firestore.getTask(taskId);
     _textInitialValue.sink.add(task.text);
     changeEventName(task.event);
     changeTaskText(task.text);
-        taskId = task.id;
-      },
-    );
   }
 
   void dispose() {

lib/src/resources/firestore_provider.dart

@@ -129,7 +129,7 @@ class FirestoreProvider {
   }
 
   /// Returns a Stream of a single task from an id.
-  Observable<TaskModel> getTask(String id) {
+  Observable<TaskModel> getTaskObservable(String id) {
     final mappedStream =
         _firestore.collection('tasks').document(id).snapshots().map(
       (DocumentSnapshot snapshot) {
@@ -143,6 +143,16 @@ class FirestoreProvider {
     return Observable(mappedStream);
   }
 
+  //TODO: Add tests for this method.
+  /// Returns a task from an id.
+  Future<TaskModel> getTask(String id) async {
+    final documentSnapshot = await _firestore.document('tasks/$id').get();
+    return TaskModel.fromFirestore(
+      documentSnapshot.data,
+      id: documentSnapshot.documentID,
+    );
+  }
+
   /// Deletes a task from firestore.
   Future<void> deleteTask(String id) async {
     try {

lib/src/screens/event_screen.dart

@@ -4,15 +4,28 @@ import '../blocs/event_bloc.dart';
 import '../widgets/custom_app_bar.dart';
 
 class EventScreen extends StatefulWidget {
+  /// The name of the event this screenn is showing.
+  final String eventName;
+
+  EventScreen({
+    @required this.eventName,
+  });
+
   _EventScreenState createState() => _EventScreenState();
 }
 
 class _EventScreenState extends State<EventScreen> {
-  final EventBloc bloc = EventBloc();
+  EventBloc bloc;
+
+  initState() {
+    super.initState();
+    bloc = EventBloc(eventName: widget.eventName);
+  }
+
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: CustomAppBar(
-        title: '',
+        title: widget.eventName,
       ),
     );
   }

lib/src/screens/home_screen.dart

@@ -93,11 +93,12 @@ class _HomeScreenState extends State<HomeScreen> {
                   task: task,
                   onDone: () => bloc.markTaskAsDone(task),
                   onEventPressed: () {
-                    bloc.updateSelectedEvent(task);
+                    // Include the event name in the route.
+                    Navigator.of(context).pushNamed('event/${task.event}');
                   },
                   onEditPressed: () {
-                    bloc.updateSelectedTask(task);
-                    Navigator.of(context).pushNamed('editTask/');
+                    // Include the id of the task to be edited in the route.
+                    Navigator.of(context).pushNamed('editTask/${task.id}');
                   },
                 ),
                 padding: EdgeInsets.only(bottom: 12),

lib/src/screens/task_screen.dart

@@ -14,8 +14,15 @@ class TaskScreen extends StatefulWidget {
   /// Wether the Screen is going to edit a current task or create a new one.
   final bool isEdit;
 
+  /// Id of the task to edit if in edit mode.
+  final String taskId;
+
+  /// Creates a screen capable of editing of creating a new task.
+  ///
+  /// [taskId] must be provided and cannot be null if [isEdit] is set to true.
   TaskScreen({
     this.isEdit = false,
+    this.taskId,
   });
 
   @override
@@ -24,11 +31,14 @@ class TaskScreen extends StatefulWidget {
 
 class _TaskScreenState extends State<TaskScreen> {
   /// An instance of this screen's bloc.
-  final TaskBloc bloc = TaskBloc();
+  TaskBloc bloc;
 
   initState() {
     if (widget.isEdit) {
+      bloc = TaskBloc(taskId: widget.taskId);
       bloc.populateWithCurrentTask();
+    } else {
+      bloc = TaskBloc();
     }
     super.initState();
   }

lib/src/services/current_selection_service.dart

@@ -1,35 +0,0 @@
-import 'package:rxdart/rxdart.dart';
-
-import '../models/event_model.dart';
-import '../models/task_model.dart';
-
-/// A service that keeps track of the current user selection.
-///
-/// When editing a task or when navigating to an event screen, the new screens
-/// can grab the user selection for this service.
-class CurrentSelectionService {
-  /// The current selected task.
-  final _selectedTask = BehaviorSubject<TaskModel>();
-
-  /// The current selected event.
-  final _selectedEvent = BehaviorSubject<EventModel>();
-
-  /// An observable of the current selected event.
-  Observable<TaskModel> get task => _selectedTask.stream;
-
-  /// The current selected event.
-  Observable<EventModel> get event => _selectedEvent.stream;
-
-  /// Updates the current selected task.
-  Function(TaskModel) get updateSelectedTask => _selectedTask.sink.add;
-
-  // Updates the current selected event.
-  Function(EventModel) get updateSelectedEvent => _selectedEvent.sink.add;
-
-  dispose() {
-    _selectedEvent.close();
-    _selectedTask.close();
-  }
-}
-
-final currentSelectionService = CurrentSelectionService();