Created
August 4, 2019 18:49
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[flutter_firestore_todos] todos bloc
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import 'dart:async'; | |
import 'package:bloc/bloc.dart'; | |
import 'package:meta/meta.dart'; | |
import 'package:flutter_firestore_todos/blocs/todos/todos.dart'; | |
import 'package:todos_repository/todos_repository.dart'; | |
class TodosBloc extends Bloc<TodosEvent, TodosState> { | |
final TodosRepository _todosRepository; | |
StreamSubscription _todosSubscription; | |
TodosBloc({@required TodosRepository todosRepository}) | |
: assert(todosRepository != null), | |
_todosRepository = todosRepository; | |
@override | |
TodosState get initialState => TodosLoading(); | |
@override | |
Stream<TodosState> mapEventToState(TodosEvent event) async* { | |
if (event is LoadTodos) { | |
yield* _mapLoadTodosToState(); | |
} else if (event is AddTodo) { | |
yield* _mapAddTodoToState(event); | |
} else if (event is UpdateTodo) { | |
yield* _mapUpdateTodoToState(event); | |
} else if (event is DeleteTodo) { | |
yield* _mapDeleteTodoToState(event); | |
} else if (event is ToggleAll) { | |
yield* _mapToggleAllToState(); | |
} else if (event is ClearCompleted) { | |
yield* _mapClearCompletedToState(); | |
} else if (event is TodosUpdated) { | |
yield* _mapTodosUpdateToState(event); | |
} | |
} | |
Stream<TodosState> _mapLoadTodosToState() async* { | |
_todosSubscription?.cancel(); | |
_todosSubscription = _todosRepository.todos().listen( | |
(todos) { | |
dispatch( | |
TodosUpdated(todos), | |
); | |
}, | |
); | |
} | |
Stream<TodosState> _mapAddTodoToState(AddTodo event) async* { | |
_todosRepository.addNewTodo(event.todo); | |
} | |
Stream<TodosState> _mapUpdateTodoToState(UpdateTodo event) async* { | |
_todosRepository.updateTodo(event.updatedTodo); | |
} | |
Stream<TodosState> _mapDeleteTodoToState(DeleteTodo event) async* { | |
_todosRepository.deleteTodo(event.todo); | |
} | |
Stream<TodosState> _mapToggleAllToState() async* { | |
final state = currentState; | |
if (state is TodosLoaded) { | |
final allComplete = state.todos.every((todo) => todo.complete); | |
final List<Todo> updatedTodos = state.todos | |
.map((todo) => todo.copyWith(complete: !allComplete)) | |
.toList(); | |
updatedTodos.forEach((updatedTodo) { | |
_todosRepository.updateTodo(updatedTodo); | |
}); | |
} | |
} | |
Stream<TodosState> _mapClearCompletedToState() async* { | |
final state = currentState; | |
if (state is TodosLoaded) { | |
final List<Todo> completedTodos = | |
state.todos.where((todo) => todo.complete).toList(); | |
completedTodos.forEach((completedTodo) { | |
_todosRepository.deleteTodo(completedTodo); | |
}); | |
} | |
} | |
Stream<TodosState> _mapTodosUpdateToState(TodosUpdated event) async* { | |
yield TodosLoaded(event.todos); | |
} | |
@override | |
void dispose() { | |
_todosSubscription?.cancel(); | |
super.dispose(); | |
} | |
} |
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