public static IApp Create(Action <IApp> work, Action <IApp, Exception> onFailure)
{
var context = new ProcessFilesApp();
var app = new IoWindowViewModel(context, work, onFailure);
var ioWindow = new IoWindow(app);
app.Owner = ioWindow;
ioWindow.Closed += (o, e) => context.ExitThread();
ElementHost.EnableModelessKeyboardInterop(ioWindow);
ioWindow.Show();
return(app);
}
internal IoWindowViewModel(ProcessFilesApp context, Action <IApp> work, Action <IApp, Exception> onFailure)
{
this.context = context;
var isInProgress = this.WhenAnyValue(me => me.TokenSource).Select(source => source != null).ObserveOn(Dispatcher.CurrentDispatcher);
isInProgressHelper = this.WhenAnyValue(me => me.TokenSource).Select(source => source != null).ToProperty(this, me => me.IsInProgress, true);
OpenFile = new InputFileBrowseViewModel(isInProgress.Select(f => !f));
SaveFile = new OutputFileBrowseViewModel(isInProgress.Select(f => !f), OpenFile);
worker.DoWork += (o, e) =>
{
work(this);
e.Result = 0;
};
worker.RunWorkerCompleted += (o, e) =>
{
if (TokenSource.IsCancellationRequested)
{
Progress = 0;
}
else if (e.Error != null)
{
MessageBox.Show(Owner, e.Error.Message, Title, MessageBoxButton.OK, MessageBoxImage.Error);
Progress = 0;
}
else
{
new ExportCompletedWindow(new ExportCompletedViewModel(Title, SaveFile.File))
{
Owner = Owner,
WindowStartupLocation = WindowStartupLocation.CenterOwner
}.ShowDialog();
}
TokenSource = null;
if (e.Error != null)
{
onFailure?.Invoke(this, e.Error);
}
};
worker.ProgressChanged += (o, e) => Progress = e.ProgressPercentage;
StartCommand = ReactiveCommand.Create(this.WhenAnyValue(me => me.OpenFile.File, me => me.SaveFile.File, me => me.TokenSource)
.Select(CanStart).ObserveOn(Dispatcher.CurrentDispatcher));
CancelCommand = ReactiveCommand.Create(isInProgress);
StartCommand.Subscribe(_ =>
{
TokenSource = new CancellationTokenSource();
worker.RunWorkerAsync();
});
CancelCommand.Subscribe(_ => Cancel());
isInProgress.Where(f => f).Subscribe(source => CancellationToken = TokenSource.Token);
this.WhenAnyValue(me => me.Title).Where(title => !string.IsNullOrEmpty(title)).Subscribe(title => Owner.Title = title);
}
