public MainWindowViewModel()
{
app = Locator.Current.GetService <AthameApp>();
downloader = new MediaDownloadManager();
source = new MediaDownloadSource();
Router = new RoutingState();
MediaSearch = new MediaSearchViewModel();
ProgressStatus = new ProgressStatusViewModel();
MediaItems = new MediaItemsViewModel(source);
DownloadMediaCommand = ReactiveCommand.CreateFromTask(
DownloadMedia,
MediaItems.CanDownload);
CancelDownloadCommand = ReactiveCommand.Create(RemoveMedia);
CanRestoreCommand = ReactiveCommand.Create(CanRestore);
SaveSettingsCommand = ReactiveCommand.Create(SaveSettings);
ViewSettingsCommand = ReactiveCommand.CreateFromObservable(
Router.Navigate <SettingsViewModel>);
ViewAboutAppCommand = ReactiveCommand.CreateFromObservable(
Router.Navigate <AboutMeViewModel>);
Activator = new ViewModelActivator();
this.WhenActivated((CompositeDisposable disposables) =>
{
this.WhenAnyValue(x => x.MediaSearch.SearchResult)
.Where(media => media != null)
.Subscribe(AddMedia)
.DisposeWith(disposables);
Observable
.FromEventPattern <MediaDownloadEventArgs>(downloader, nameof(downloader.MediaDownloadStarted))
.Subscribe(e => MediaServiceDequeued(e.EventArgs))
.DisposeWith(disposables);
Observable
.FromEventPattern <TrackDownloadEventArgs>(downloader, nameof(downloader.TrackDownloadStarted))
.Subscribe()
.DisposeWith(disposables);
Observable
.FromEventPattern <TrackDownloadEventArgs>(
downloader.TrackDownloader, nameof(downloader.TrackDownloader.TrackDownloadStarted), RxApp.MainThreadScheduler)
.Subscribe(e => TrackDownloadStarted(e.EventArgs));
Observable
.FromEventPattern <TrackDownloadEventArgs>(downloader, nameof(downloader.TrackDownloadProgressChanged))
.Subscribe(e => TrackDownloadProgressed(e.EventArgs))
.DisposeWith(disposables);
Observable
.FromEventPattern <TrackDownloadEventArgs>(downloader, nameof(downloader.TrackDownloadCompleted))
.Subscribe(e => TrackDownloadCompleted(e.EventArgs))
.DisposeWith(disposables);
});
}
public MediaItemsViewModel(MediaDownloadSource source)
{
source
.Connect()
.Transform(ms => new MediaViewItem(ms.Media))
.ObserveOn(RxApp.MainThreadScheduler)
.Bind(out items)
.DisposeMany()
.Subscribe();
CanDownload = this
.WhenAnyValue(x => x.MediaItems.Count)
.Select(count => count > 0 && items.Any(x => x.IsDownloadable()));
}