private async Task LoadTodoList()
{
var todos = await _todoService.GetAll();
var pendingGroup = TodoItems.FirstOrDefault(t => t.State == TodoItemCompletedState.Pending);
if (pendingGroup is null)
{
pendingGroup = new TodoItemsGroup(TodoItemCompletedState.Pending);
}
var completedGroup = TodoItems.FirstOrDefault(t => t.State == TodoItemCompletedState.Completed);
if (completedGroup is null)
{
completedGroup = new TodoItemsGroup(TodoItemCompletedState.Completed);
}
var pending = todos.Where(t => !t.Completed).ToList();
pendingGroup.TodoItems.ReplaceRange(pending);
var completed = todos.Where(t => t.Completed).ToList();
completedGroup.TodoItems.ReplaceRange(completed);
TodoItems.Clear();
TodoItems.Add(pendingGroup);
TodoItems.Add(completedGroup);
}
public bool Delete(int id)
{
var item = TodoItems.FirstOrDefault(t => t.Id == id);
if (item != null)
{
TodoItems.Remove(item);
return(true);
}
return(false);
}
public MainPageViewModel(INavigationService navigationService)
: base(navigationService)
{
Title = "Todo List";
var query = CrossCloudFirestore.Current
.Instance
.GetCollection(TodoItem.CollectionPath)
.OrderBy(nameof(TodoItem.CreatedAt), true);
query.ObserveAdded()
.Select(change => (Object: change.Document.ToObject <TodoItem>(), Index: change.NewIndex))
.Select(t => (ViewModel: new TodoItemViewModel(t.Object), Index: t.Index))
.Subscribe(t => TodoItems.InsertOnScheduler(t.Index, t.ViewModel))
.AddTo(_disposables);
query.ObserveModified()
.Select(change => change.Document.ToObject <TodoItem>())
.Select(todoItem => (TodoItem: todoItem, ViewModel: TodoItems.FirstOrDefault(x => x.Id == todoItem.Id)))
.Where(t => t.ViewModel != null)
.Subscribe(t => t.ViewModel.Update(t.TodoItem.Name, t.TodoItem.Notes))
.AddTo(_disposables);
query.ObserveRemoved()
.Select(change => TodoItems.FirstOrDefault(x => x.Id == change.Document.Id))
.Where(viewModel => viewModel != null)
.Subscribe(viewModel => TodoItems.RemoveOnScheduler(viewModel))
.AddTo(_disposables);
AddCommand = new ReactiveCommand();
AddCommand.Subscribe(() =>
{
navigationService.NavigateAsync <NewTodoItemPageViewModel>(useModalNavigation: true, wrapInNavigationPage: true);
});
SelectItemCommand = new ReactiveCommand <TodoItemViewModel>();
SelectItemCommand.Subscribe(item =>
{
navigationService.NavigateAsync <TodoItemDetailPageViewModel, string>(item.Id);
});
}
public TodoItem GetTodoItem(Guid id) => TodoItems.FirstOrDefault(i => i.Identifier == id);