tomwis

var canSearch = this.WhenAnyValue(vm => vm.SearchTerm)
    .Where(x => !string.IsNullOrWhiteSpace(x) && x.Length >= 3)
    .Publish()
    .RefCount();

SearchCmd = ReactiveCommand.CreateFromObservable<string, IEnumerable<string>>(term => Observable.StartAsync(_ => _movieService.GetMovies(term)).TakeUntil(canSearch));

SearchCmd.Subscribe(results =>
{
    Results.Clear();

tomwis

_isSearching = SearchCmd.IsExecuting.ToProperty(this, vm => vm.IsSearching);

tomwis

readonly ObservableAsPropertyHelper<bool> _isSearching;
public bool IsSearching => _isSearching.Value;

tomwis

public ReactiveCommand<string, IEnumerable<string>> SearchCmd { get; set; }
public ReactiveList<string> Results { get; set; }

string _searchTerm;
public string SearchTerm
{
    get { return _searchTerm; }
    set { this.RaiseAndSetIfChanged(ref _searchTerm, value); }
}

tomwis

Results = new ReactiveList<string>();

var canSearch = this.WhenAny(x => x.SearchTerm, x => !string.IsNullOrWhiteSpace(x.Value) && x.Value.Length >= 3);
SearchCmd = ReactiveCommand.CreateFromTask<string, IEnumerable<string>>(term => _movieService.GetMovies(term), canSearch);
SearchCmd.Subscribe(results =>
{
    Results.Clear();
    Results.AddRange(results);
});

tomwis

public partial class MainPage : ContentPage, IViewFor<MainViewModel>
{
    public MainPage()
    {
        InitializeComponent();
        ViewModel = new MainViewModel(new MovieService());
        this.Bind(ViewModel, vm => vm.SearchTerm, v => v.entryField.Text);
        this.OneWayBind(ViewModel, vm => vm.Results, v => v.resultList.ItemsSource);
        this.OneWayBind(ViewModel, vm => vm.IsSearching, v => v.loadingBar.IsVisible);
    }

tomwis

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:ReactiveUIExampleXamarinForms"
             x:Class="ReactiveUIExampleXamarinForms.MainPage">

    <StackLayout Padding="12">
        <Label Text="Search:" VerticalOptions="Center" HorizontalOptions="Center" />
        <Entry x:Name="entryField" />
        <ActivityIndicator x:Name="loadingBar"/>

tomwis

await _dialogService.ShowMessage("Message, "Title", "Ok", AfterAction);

tomwis

public RelayCommand AddMonthCmd => new RelayCommand(async () =>
{
    // w DashboardViewModel
    await _navigationService.Navigate<MonthEditPage>();
});

public RelayCommand SaveCmd => new RelayCommand(async () => 
{
    // w MonthEditViewModel - wracamy do Dashboardu
    // zapisujemy...

tomwis

public class DashboardViewModel : ViewModelBase
{
    IDbService _dbService;
    INavigationService _navigationService;
    IMonthService _monthService;

    public DashboardViewModel(IDbService dbService, INavigationService navigationService, IMonthService monthService)
    {
        _dbService = dbService;
        _navigationService = navigationService;